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3437 lines
80 KiB
3437 lines
80 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* comedi/comedi_fops.c |
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* comedi kernel module |
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* |
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* COMEDI - Linux Control and Measurement Device Interface |
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* Copyright (C) 1997-2007 David A. Schleef <[email protected]> |
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* compat ioctls: |
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* Author: Ian Abbott, MEV Ltd. <[email protected]> |
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* Copyright (C) 2007 MEV Ltd. <http://www.mev.co.uk/> |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/module.h> |
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/sched/signal.h> |
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#include <linux/fcntl.h> |
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#include <linux/delay.h> |
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#include <linux/mm.h> |
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#include <linux/slab.h> |
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#include <linux/poll.h> |
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#include <linux/device.h> |
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#include <linux/fs.h> |
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#include "comedidev.h" |
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#include <linux/cdev.h> |
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|
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#include <linux/io.h> |
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#include <linux/uaccess.h> |
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#include <linux/compat.h> |
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|
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#include "comedi_internal.h" |
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|
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/* |
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* comedi_subdevice "runflags" |
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* COMEDI_SRF_RT: DEPRECATED: command is running real-time |
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* COMEDI_SRF_ERROR: indicates an COMEDI_CB_ERROR event has occurred |
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* since the last command was started |
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* COMEDI_SRF_RUNNING: command is running |
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* COMEDI_SRF_FREE_SPRIV: free s->private on detach |
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* |
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* COMEDI_SRF_BUSY_MASK: runflags that indicate the subdevice is "busy" |
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*/ |
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#define COMEDI_SRF_RT BIT(1) |
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#define COMEDI_SRF_ERROR BIT(2) |
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#define COMEDI_SRF_RUNNING BIT(27) |
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#define COMEDI_SRF_FREE_SPRIV BIT(31) |
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|
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#define COMEDI_SRF_BUSY_MASK (COMEDI_SRF_ERROR | COMEDI_SRF_RUNNING) |
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/** |
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* struct comedi_file - Per-file private data for COMEDI device |
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* @dev: COMEDI device. |
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* @read_subdev: Current "read" subdevice. |
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* @write_subdev: Current "write" subdevice. |
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* @last_detach_count: Last known detach count. |
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* @last_attached: Last known attached/detached state. |
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*/ |
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struct comedi_file { |
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struct comedi_device *dev; |
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struct comedi_subdevice *read_subdev; |
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struct comedi_subdevice *write_subdev; |
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unsigned int last_detach_count; |
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unsigned int last_attached:1; |
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}; |
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|
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#define COMEDI_NUM_MINORS 0x100 |
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#define COMEDI_NUM_SUBDEVICE_MINORS \ |
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(COMEDI_NUM_MINORS - COMEDI_NUM_BOARD_MINORS) |
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|
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static unsigned short comedi_num_legacy_minors; |
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module_param(comedi_num_legacy_minors, ushort, 0444); |
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MODULE_PARM_DESC(comedi_num_legacy_minors, |
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"number of comedi minor devices to reserve for non-auto-configured devices (default 0)" |
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); |
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unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB; |
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module_param(comedi_default_buf_size_kb, uint, 0644); |
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MODULE_PARM_DESC(comedi_default_buf_size_kb, |
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"default asynchronous buffer size in KiB (default " |
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__MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")"); |
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|
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unsigned int comedi_default_buf_maxsize_kb = |
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CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB; |
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module_param(comedi_default_buf_maxsize_kb, uint, 0644); |
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MODULE_PARM_DESC(comedi_default_buf_maxsize_kb, |
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"default maximum size of asynchronous buffer in KiB (default " |
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__MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")"); |
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static DEFINE_MUTEX(comedi_board_minor_table_lock); |
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static struct comedi_device |
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*comedi_board_minor_table[COMEDI_NUM_BOARD_MINORS]; |
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|
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static DEFINE_MUTEX(comedi_subdevice_minor_table_lock); |
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/* Note: indexed by minor - COMEDI_NUM_BOARD_MINORS. */ |
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static struct comedi_subdevice |
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*comedi_subdevice_minor_table[COMEDI_NUM_SUBDEVICE_MINORS]; |
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|
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static struct class *comedi_class; |
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static struct cdev comedi_cdev; |
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static void comedi_device_init(struct comedi_device *dev) |
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{ |
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kref_init(&dev->refcount); |
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spin_lock_init(&dev->spinlock); |
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mutex_init(&dev->mutex); |
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init_rwsem(&dev->attach_lock); |
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dev->minor = -1; |
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} |
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static void comedi_dev_kref_release(struct kref *kref) |
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{ |
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struct comedi_device *dev = |
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container_of(kref, struct comedi_device, refcount); |
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mutex_destroy(&dev->mutex); |
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put_device(dev->class_dev); |
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kfree(dev); |
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} |
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/** |
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* comedi_dev_put() - Release a use of a COMEDI device |
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* @dev: COMEDI device. |
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* |
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* Must be called when a user of a COMEDI device is finished with it. |
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* When the last user of the COMEDI device calls this function, the |
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* COMEDI device is destroyed. |
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* |
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* Return: 1 if the COMEDI device is destroyed by this call or @dev is |
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* NULL, otherwise return 0. Callers must not assume the COMEDI |
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* device is still valid if this function returns 0. |
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*/ |
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int comedi_dev_put(struct comedi_device *dev) |
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{ |
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if (dev) |
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return kref_put(&dev->refcount, comedi_dev_kref_release); |
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return 1; |
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} |
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EXPORT_SYMBOL_GPL(comedi_dev_put); |
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static struct comedi_device *comedi_dev_get(struct comedi_device *dev) |
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{ |
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if (dev) |
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kref_get(&dev->refcount); |
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return dev; |
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} |
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static void comedi_device_cleanup(struct comedi_device *dev) |
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{ |
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struct module *driver_module = NULL; |
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|
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if (!dev) |
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return; |
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mutex_lock(&dev->mutex); |
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if (dev->attached) |
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driver_module = dev->driver->module; |
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comedi_device_detach(dev); |
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if (driver_module && dev->use_count) |
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module_put(driver_module); |
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mutex_unlock(&dev->mutex); |
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} |
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static bool comedi_clear_board_dev(struct comedi_device *dev) |
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{ |
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unsigned int i = dev->minor; |
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bool cleared = false; |
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lockdep_assert_held(&dev->mutex); |
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mutex_lock(&comedi_board_minor_table_lock); |
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if (dev == comedi_board_minor_table[i]) { |
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comedi_board_minor_table[i] = NULL; |
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cleared = true; |
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} |
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mutex_unlock(&comedi_board_minor_table_lock); |
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return cleared; |
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} |
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static struct comedi_device *comedi_clear_board_minor(unsigned int minor) |
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{ |
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struct comedi_device *dev; |
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mutex_lock(&comedi_board_minor_table_lock); |
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dev = comedi_board_minor_table[minor]; |
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comedi_board_minor_table[minor] = NULL; |
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mutex_unlock(&comedi_board_minor_table_lock); |
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return dev; |
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} |
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static void comedi_free_board_dev(struct comedi_device *dev) |
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{ |
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if (dev) { |
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comedi_device_cleanup(dev); |
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if (dev->class_dev) { |
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device_destroy(comedi_class, |
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MKDEV(COMEDI_MAJOR, dev->minor)); |
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} |
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comedi_dev_put(dev); |
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} |
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} |
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static struct comedi_subdevice * |
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comedi_subdevice_from_minor(const struct comedi_device *dev, unsigned int minor) |
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{ |
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struct comedi_subdevice *s; |
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unsigned int i = minor - COMEDI_NUM_BOARD_MINORS; |
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mutex_lock(&comedi_subdevice_minor_table_lock); |
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s = comedi_subdevice_minor_table[i]; |
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if (s && s->device != dev) |
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s = NULL; |
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mutex_unlock(&comedi_subdevice_minor_table_lock); |
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return s; |
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} |
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static struct comedi_device *comedi_dev_get_from_board_minor(unsigned int minor) |
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{ |
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struct comedi_device *dev; |
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mutex_lock(&comedi_board_minor_table_lock); |
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dev = comedi_dev_get(comedi_board_minor_table[minor]); |
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mutex_unlock(&comedi_board_minor_table_lock); |
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return dev; |
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} |
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static struct comedi_device * |
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comedi_dev_get_from_subdevice_minor(unsigned int minor) |
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{ |
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struct comedi_device *dev; |
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struct comedi_subdevice *s; |
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unsigned int i = minor - COMEDI_NUM_BOARD_MINORS; |
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mutex_lock(&comedi_subdevice_minor_table_lock); |
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s = comedi_subdevice_minor_table[i]; |
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dev = comedi_dev_get(s ? s->device : NULL); |
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mutex_unlock(&comedi_subdevice_minor_table_lock); |
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return dev; |
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} |
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/** |
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* comedi_dev_get_from_minor() - Get COMEDI device by minor device number |
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* @minor: Minor device number. |
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* |
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* Finds the COMEDI device associated with the minor device number, if any, |
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* and increments its reference count. The COMEDI device is prevented from |
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* being freed until a matching call is made to comedi_dev_put(). |
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* |
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* Return: A pointer to the COMEDI device if it exists, with its usage |
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* reference incremented. Return NULL if no COMEDI device exists with the |
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* specified minor device number. |
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*/ |
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struct comedi_device *comedi_dev_get_from_minor(unsigned int minor) |
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{ |
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if (minor < COMEDI_NUM_BOARD_MINORS) |
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return comedi_dev_get_from_board_minor(minor); |
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return comedi_dev_get_from_subdevice_minor(minor); |
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} |
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EXPORT_SYMBOL_GPL(comedi_dev_get_from_minor); |
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static struct comedi_subdevice * |
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comedi_read_subdevice(const struct comedi_device *dev, unsigned int minor) |
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{ |
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struct comedi_subdevice *s; |
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lockdep_assert_held(&dev->mutex); |
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if (minor >= COMEDI_NUM_BOARD_MINORS) { |
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s = comedi_subdevice_from_minor(dev, minor); |
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if (!s || (s->subdev_flags & SDF_CMD_READ)) |
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return s; |
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} |
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return dev->read_subdev; |
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} |
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static struct comedi_subdevice * |
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comedi_write_subdevice(const struct comedi_device *dev, unsigned int minor) |
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{ |
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struct comedi_subdevice *s; |
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lockdep_assert_held(&dev->mutex); |
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if (minor >= COMEDI_NUM_BOARD_MINORS) { |
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s = comedi_subdevice_from_minor(dev, minor); |
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if (!s || (s->subdev_flags & SDF_CMD_WRITE)) |
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return s; |
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} |
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return dev->write_subdev; |
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} |
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static void comedi_file_reset(struct file *file) |
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{ |
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struct comedi_file *cfp = file->private_data; |
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struct comedi_device *dev = cfp->dev; |
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struct comedi_subdevice *s, *read_s, *write_s; |
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unsigned int minor = iminor(file_inode(file)); |
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read_s = dev->read_subdev; |
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write_s = dev->write_subdev; |
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if (minor >= COMEDI_NUM_BOARD_MINORS) { |
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s = comedi_subdevice_from_minor(dev, minor); |
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if (!s || s->subdev_flags & SDF_CMD_READ) |
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read_s = s; |
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if (!s || s->subdev_flags & SDF_CMD_WRITE) |
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write_s = s; |
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} |
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cfp->last_attached = dev->attached; |
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cfp->last_detach_count = dev->detach_count; |
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WRITE_ONCE(cfp->read_subdev, read_s); |
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WRITE_ONCE(cfp->write_subdev, write_s); |
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} |
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static void comedi_file_check(struct file *file) |
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{ |
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struct comedi_file *cfp = file->private_data; |
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struct comedi_device *dev = cfp->dev; |
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if (cfp->last_attached != dev->attached || |
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cfp->last_detach_count != dev->detach_count) |
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comedi_file_reset(file); |
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} |
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static struct comedi_subdevice *comedi_file_read_subdevice(struct file *file) |
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{ |
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struct comedi_file *cfp = file->private_data; |
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comedi_file_check(file); |
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return READ_ONCE(cfp->read_subdev); |
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} |
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static struct comedi_subdevice *comedi_file_write_subdevice(struct file *file) |
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{ |
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struct comedi_file *cfp = file->private_data; |
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comedi_file_check(file); |
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return READ_ONCE(cfp->write_subdev); |
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} |
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static int resize_async_buffer(struct comedi_device *dev, |
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struct comedi_subdevice *s, |
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unsigned int new_size) |
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{ |
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struct comedi_async *async = s->async; |
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int retval; |
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lockdep_assert_held(&dev->mutex); |
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if (new_size > async->max_bufsize) |
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return -EPERM; |
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if (s->busy) { |
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dev_dbg(dev->class_dev, |
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"subdevice is busy, cannot resize buffer\n"); |
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return -EBUSY; |
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} |
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if (comedi_buf_is_mmapped(s)) { |
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dev_dbg(dev->class_dev, |
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"subdevice is mmapped, cannot resize buffer\n"); |
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return -EBUSY; |
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} |
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|
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/* make sure buffer is an integral number of pages (we round up) */ |
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new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; |
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retval = comedi_buf_alloc(dev, s, new_size); |
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if (retval < 0) |
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return retval; |
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if (s->buf_change) { |
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retval = s->buf_change(dev, s); |
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if (retval < 0) |
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return retval; |
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} |
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dev_dbg(dev->class_dev, "subd %d buffer resized to %i bytes\n", |
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s->index, async->prealloc_bufsz); |
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return 0; |
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} |
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|
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/* sysfs attribute files */ |
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static ssize_t max_read_buffer_kb_show(struct device *csdev, |
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struct device_attribute *attr, char *buf) |
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{ |
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unsigned int minor = MINOR(csdev->devt); |
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struct comedi_device *dev; |
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struct comedi_subdevice *s; |
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unsigned int size = 0; |
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dev = comedi_dev_get_from_minor(minor); |
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if (!dev) |
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return -ENODEV; |
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mutex_lock(&dev->mutex); |
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s = comedi_read_subdevice(dev, minor); |
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if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
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size = s->async->max_bufsize / 1024; |
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mutex_unlock(&dev->mutex); |
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comedi_dev_put(dev); |
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return snprintf(buf, PAGE_SIZE, "%u\n", size); |
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} |
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static ssize_t max_read_buffer_kb_store(struct device *csdev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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unsigned int minor = MINOR(csdev->devt); |
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struct comedi_device *dev; |
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struct comedi_subdevice *s; |
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unsigned int size; |
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int err; |
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err = kstrtouint(buf, 10, &size); |
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if (err) |
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return err; |
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if (size > (UINT_MAX / 1024)) |
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return -EINVAL; |
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size *= 1024; |
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dev = comedi_dev_get_from_minor(minor); |
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if (!dev) |
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return -ENODEV; |
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mutex_lock(&dev->mutex); |
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s = comedi_read_subdevice(dev, minor); |
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if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
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s->async->max_bufsize = size; |
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else |
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err = -EINVAL; |
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mutex_unlock(&dev->mutex); |
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|
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comedi_dev_put(dev); |
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return err ? err : count; |
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} |
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static DEVICE_ATTR_RW(max_read_buffer_kb); |
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static ssize_t read_buffer_kb_show(struct device *csdev, |
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struct device_attribute *attr, char *buf) |
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{ |
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unsigned int minor = MINOR(csdev->devt); |
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struct comedi_device *dev; |
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struct comedi_subdevice *s; |
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unsigned int size = 0; |
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|
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dev = comedi_dev_get_from_minor(minor); |
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if (!dev) |
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return -ENODEV; |
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|
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mutex_lock(&dev->mutex); |
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s = comedi_read_subdevice(dev, minor); |
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if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
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size = s->async->prealloc_bufsz / 1024; |
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mutex_unlock(&dev->mutex); |
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|
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comedi_dev_put(dev); |
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return snprintf(buf, PAGE_SIZE, "%u\n", size); |
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} |
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|
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static ssize_t read_buffer_kb_store(struct device *csdev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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unsigned int minor = MINOR(csdev->devt); |
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struct comedi_device *dev; |
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struct comedi_subdevice *s; |
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unsigned int size; |
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int err; |
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|
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err = kstrtouint(buf, 10, &size); |
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if (err) |
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return err; |
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if (size > (UINT_MAX / 1024)) |
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return -EINVAL; |
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size *= 1024; |
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|
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dev = comedi_dev_get_from_minor(minor); |
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if (!dev) |
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return -ENODEV; |
|
|
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mutex_lock(&dev->mutex); |
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s = comedi_read_subdevice(dev, minor); |
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if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) |
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err = resize_async_buffer(dev, s, size); |
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else |
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err = -EINVAL; |
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mutex_unlock(&dev->mutex); |
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|
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comedi_dev_put(dev); |
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return err ? err : count; |
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} |
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static DEVICE_ATTR_RW(read_buffer_kb); |
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|
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static ssize_t max_write_buffer_kb_show(struct device *csdev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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unsigned int minor = MINOR(csdev->devt); |
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struct comedi_device *dev; |
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struct comedi_subdevice *s; |
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unsigned int size = 0; |
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|
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dev = comedi_dev_get_from_minor(minor); |
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if (!dev) |
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return -ENODEV; |
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|
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mutex_lock(&dev->mutex); |
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s = comedi_write_subdevice(dev, minor); |
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if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
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size = s->async->max_bufsize / 1024; |
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mutex_unlock(&dev->mutex); |
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|
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comedi_dev_put(dev); |
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return snprintf(buf, PAGE_SIZE, "%u\n", size); |
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} |
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|
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static ssize_t max_write_buffer_kb_store(struct device *csdev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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unsigned int minor = MINOR(csdev->devt); |
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struct comedi_device *dev; |
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struct comedi_subdevice *s; |
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unsigned int size; |
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int err; |
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|
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err = kstrtouint(buf, 10, &size); |
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if (err) |
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return err; |
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if (size > (UINT_MAX / 1024)) |
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return -EINVAL; |
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size *= 1024; |
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|
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dev = comedi_dev_get_from_minor(minor); |
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if (!dev) |
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return -ENODEV; |
|
|
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mutex_lock(&dev->mutex); |
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s = comedi_write_subdevice(dev, minor); |
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if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
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s->async->max_bufsize = size; |
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else |
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err = -EINVAL; |
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mutex_unlock(&dev->mutex); |
|
|
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comedi_dev_put(dev); |
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return err ? err : count; |
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} |
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static DEVICE_ATTR_RW(max_write_buffer_kb); |
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|
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static ssize_t write_buffer_kb_show(struct device *csdev, |
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struct device_attribute *attr, char *buf) |
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{ |
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unsigned int minor = MINOR(csdev->devt); |
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struct comedi_device *dev; |
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struct comedi_subdevice *s; |
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unsigned int size = 0; |
|
|
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dev = comedi_dev_get_from_minor(minor); |
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if (!dev) |
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return -ENODEV; |
|
|
|
mutex_lock(&dev->mutex); |
|
s = comedi_write_subdevice(dev, minor); |
|
if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
|
size = s->async->prealloc_bufsz / 1024; |
|
mutex_unlock(&dev->mutex); |
|
|
|
comedi_dev_put(dev); |
|
return snprintf(buf, PAGE_SIZE, "%u\n", size); |
|
} |
|
|
|
static ssize_t write_buffer_kb_store(struct device *csdev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
unsigned int minor = MINOR(csdev->devt); |
|
struct comedi_device *dev; |
|
struct comedi_subdevice *s; |
|
unsigned int size; |
|
int err; |
|
|
|
err = kstrtouint(buf, 10, &size); |
|
if (err) |
|
return err; |
|
if (size > (UINT_MAX / 1024)) |
|
return -EINVAL; |
|
size *= 1024; |
|
|
|
dev = comedi_dev_get_from_minor(minor); |
|
if (!dev) |
|
return -ENODEV; |
|
|
|
mutex_lock(&dev->mutex); |
|
s = comedi_write_subdevice(dev, minor); |
|
if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) |
|
err = resize_async_buffer(dev, s, size); |
|
else |
|
err = -EINVAL; |
|
mutex_unlock(&dev->mutex); |
|
|
|
comedi_dev_put(dev); |
|
return err ? err : count; |
|
} |
|
static DEVICE_ATTR_RW(write_buffer_kb); |
|
|
|
static struct attribute *comedi_dev_attrs[] = { |
|
&dev_attr_max_read_buffer_kb.attr, |
|
&dev_attr_read_buffer_kb.attr, |
|
&dev_attr_max_write_buffer_kb.attr, |
|
&dev_attr_write_buffer_kb.attr, |
|
NULL, |
|
}; |
|
ATTRIBUTE_GROUPS(comedi_dev); |
|
|
|
static void __comedi_clear_subdevice_runflags(struct comedi_subdevice *s, |
|
unsigned int bits) |
|
{ |
|
s->runflags &= ~bits; |
|
} |
|
|
|
static void __comedi_set_subdevice_runflags(struct comedi_subdevice *s, |
|
unsigned int bits) |
|
{ |
|
s->runflags |= bits; |
|
} |
|
|
|
static void comedi_update_subdevice_runflags(struct comedi_subdevice *s, |
|
unsigned int mask, |
|
unsigned int bits) |
|
{ |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&s->spin_lock, flags); |
|
__comedi_clear_subdevice_runflags(s, mask); |
|
__comedi_set_subdevice_runflags(s, bits & mask); |
|
spin_unlock_irqrestore(&s->spin_lock, flags); |
|
} |
|
|
|
static unsigned int __comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
|
{ |
|
return s->runflags; |
|
} |
|
|
|
static unsigned int comedi_get_subdevice_runflags(struct comedi_subdevice *s) |
|
{ |
|
unsigned long flags; |
|
unsigned int runflags; |
|
|
|
spin_lock_irqsave(&s->spin_lock, flags); |
|
runflags = __comedi_get_subdevice_runflags(s); |
|
spin_unlock_irqrestore(&s->spin_lock, flags); |
|
return runflags; |
|
} |
|
|
|
static bool comedi_is_runflags_running(unsigned int runflags) |
|
{ |
|
return runflags & COMEDI_SRF_RUNNING; |
|
} |
|
|
|
static bool comedi_is_runflags_in_error(unsigned int runflags) |
|
{ |
|
return runflags & COMEDI_SRF_ERROR; |
|
} |
|
|
|
/** |
|
* comedi_is_subdevice_running() - Check if async command running on subdevice |
|
* @s: COMEDI subdevice. |
|
* |
|
* Return: %true if an asynchronous COMEDI command is active on the |
|
* subdevice, else %false. |
|
*/ |
|
bool comedi_is_subdevice_running(struct comedi_subdevice *s) |
|
{ |
|
unsigned int runflags = comedi_get_subdevice_runflags(s); |
|
|
|
return comedi_is_runflags_running(runflags); |
|
} |
|
EXPORT_SYMBOL_GPL(comedi_is_subdevice_running); |
|
|
|
static bool __comedi_is_subdevice_running(struct comedi_subdevice *s) |
|
{ |
|
unsigned int runflags = __comedi_get_subdevice_runflags(s); |
|
|
|
return comedi_is_runflags_running(runflags); |
|
} |
|
|
|
bool comedi_can_auto_free_spriv(struct comedi_subdevice *s) |
|
{ |
|
unsigned int runflags = __comedi_get_subdevice_runflags(s); |
|
|
|
return runflags & COMEDI_SRF_FREE_SPRIV; |
|
} |
|
|
|
/** |
|
* comedi_set_spriv_auto_free() - Mark subdevice private data as freeable |
|
* @s: COMEDI subdevice. |
|
* |
|
* Mark the subdevice as having a pointer to private data that can be |
|
* automatically freed when the COMEDI device is detached from the low-level |
|
* driver. |
|
*/ |
|
void comedi_set_spriv_auto_free(struct comedi_subdevice *s) |
|
{ |
|
__comedi_set_subdevice_runflags(s, COMEDI_SRF_FREE_SPRIV); |
|
} |
|
EXPORT_SYMBOL_GPL(comedi_set_spriv_auto_free); |
|
|
|
/** |
|
* comedi_alloc_spriv - Allocate memory for the subdevice private data |
|
* @s: COMEDI subdevice. |
|
* @size: Size of the memory to allocate. |
|
* |
|
* Allocate memory for the subdevice private data and point @s->private |
|
* to it. The memory will be freed automatically when the COMEDI device |
|
* is detached from the low-level driver. |
|
* |
|
* Return: A pointer to the allocated memory @s->private on success. |
|
* Return NULL on failure. |
|
*/ |
|
void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size) |
|
{ |
|
s->private = kzalloc(size, GFP_KERNEL); |
|
if (s->private) |
|
comedi_set_spriv_auto_free(s); |
|
return s->private; |
|
} |
|
EXPORT_SYMBOL_GPL(comedi_alloc_spriv); |
|
|
|
/* |
|
* This function restores a subdevice to an idle state. |
|
*/ |
|
static void do_become_nonbusy(struct comedi_device *dev, |
|
struct comedi_subdevice *s) |
|
{ |
|
struct comedi_async *async = s->async; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
comedi_update_subdevice_runflags(s, COMEDI_SRF_RUNNING, 0); |
|
if (async) { |
|
comedi_buf_reset(s); |
|
async->inttrig = NULL; |
|
kfree(async->cmd.chanlist); |
|
async->cmd.chanlist = NULL; |
|
s->busy = NULL; |
|
wake_up_interruptible_all(&async->wait_head); |
|
} else { |
|
dev_err(dev->class_dev, |
|
"BUG: (?) %s called with async=NULL\n", __func__); |
|
s->busy = NULL; |
|
} |
|
} |
|
|
|
static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) |
|
{ |
|
int ret = 0; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
if (comedi_is_subdevice_running(s) && s->cancel) |
|
ret = s->cancel(dev, s); |
|
|
|
do_become_nonbusy(dev, s); |
|
|
|
return ret; |
|
} |
|
|
|
void comedi_device_cancel_all(struct comedi_device *dev) |
|
{ |
|
struct comedi_subdevice *s; |
|
int i; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
if (!dev->attached) |
|
return; |
|
|
|
for (i = 0; i < dev->n_subdevices; i++) { |
|
s = &dev->subdevices[i]; |
|
if (s->async) |
|
do_cancel(dev, s); |
|
} |
|
} |
|
|
|
static int is_device_busy(struct comedi_device *dev) |
|
{ |
|
struct comedi_subdevice *s; |
|
int i; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
if (!dev->attached) |
|
return 0; |
|
|
|
for (i = 0; i < dev->n_subdevices; i++) { |
|
s = &dev->subdevices[i]; |
|
if (s->busy) |
|
return 1; |
|
if (s->async && comedi_buf_is_mmapped(s)) |
|
return 1; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* COMEDI_DEVCONFIG ioctl |
|
* attaches (and configures) or detaches a legacy device |
|
* |
|
* arg: |
|
* pointer to comedi_devconfig structure (NULL if detaching) |
|
* |
|
* reads: |
|
* comedi_devconfig structure (if attaching) |
|
* |
|
* writes: |
|
* nothing |
|
*/ |
|
static int do_devconfig_ioctl(struct comedi_device *dev, |
|
struct comedi_devconfig __user *arg) |
|
{ |
|
struct comedi_devconfig it; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
if (!capable(CAP_SYS_ADMIN)) |
|
return -EPERM; |
|
|
|
if (!arg) { |
|
if (is_device_busy(dev)) |
|
return -EBUSY; |
|
if (dev->attached) { |
|
struct module *driver_module = dev->driver->module; |
|
|
|
comedi_device_detach(dev); |
|
module_put(driver_module); |
|
} |
|
return 0; |
|
} |
|
|
|
if (copy_from_user(&it, arg, sizeof(it))) |
|
return -EFAULT; |
|
|
|
it.board_name[COMEDI_NAMELEN - 1] = 0; |
|
|
|
if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { |
|
dev_warn(dev->class_dev, |
|
"comedi_config --init_data is deprecated\n"); |
|
return -EINVAL; |
|
} |
|
|
|
if (dev->minor >= comedi_num_legacy_minors) |
|
/* don't re-use dynamically allocated comedi devices */ |
|
return -EBUSY; |
|
|
|
/* This increments the driver module count on success. */ |
|
return comedi_device_attach(dev, &it); |
|
} |
|
|
|
/* |
|
* COMEDI_BUFCONFIG ioctl |
|
* buffer configuration |
|
* |
|
* arg: |
|
* pointer to comedi_bufconfig structure |
|
* |
|
* reads: |
|
* comedi_bufconfig structure |
|
* |
|
* writes: |
|
* modified comedi_bufconfig structure |
|
*/ |
|
static int do_bufconfig_ioctl(struct comedi_device *dev, |
|
struct comedi_bufconfig __user *arg) |
|
{ |
|
struct comedi_bufconfig bc; |
|
struct comedi_async *async; |
|
struct comedi_subdevice *s; |
|
int retval = 0; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
if (copy_from_user(&bc, arg, sizeof(bc))) |
|
return -EFAULT; |
|
|
|
if (bc.subdevice >= dev->n_subdevices) |
|
return -EINVAL; |
|
|
|
s = &dev->subdevices[bc.subdevice]; |
|
async = s->async; |
|
|
|
if (!async) { |
|
dev_dbg(dev->class_dev, |
|
"subdevice does not have async capability\n"); |
|
bc.size = 0; |
|
bc.maximum_size = 0; |
|
goto copyback; |
|
} |
|
|
|
if (bc.maximum_size) { |
|
if (!capable(CAP_SYS_ADMIN)) |
|
return -EPERM; |
|
|
|
async->max_bufsize = bc.maximum_size; |
|
} |
|
|
|
if (bc.size) { |
|
retval = resize_async_buffer(dev, s, bc.size); |
|
if (retval < 0) |
|
return retval; |
|
} |
|
|
|
bc.size = async->prealloc_bufsz; |
|
bc.maximum_size = async->max_bufsize; |
|
|
|
copyback: |
|
if (copy_to_user(arg, &bc, sizeof(bc))) |
|
return -EFAULT; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* COMEDI_DEVINFO ioctl |
|
* device info |
|
* |
|
* arg: |
|
* pointer to comedi_devinfo structure |
|
* |
|
* reads: |
|
* nothing |
|
* |
|
* writes: |
|
* comedi_devinfo structure |
|
*/ |
|
static int do_devinfo_ioctl(struct comedi_device *dev, |
|
struct comedi_devinfo __user *arg, |
|
struct file *file) |
|
{ |
|
struct comedi_subdevice *s; |
|
struct comedi_devinfo devinfo; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
memset(&devinfo, 0, sizeof(devinfo)); |
|
|
|
/* fill devinfo structure */ |
|
devinfo.version_code = COMEDI_VERSION_CODE; |
|
devinfo.n_subdevs = dev->n_subdevices; |
|
strscpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); |
|
strscpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); |
|
|
|
s = comedi_file_read_subdevice(file); |
|
if (s) |
|
devinfo.read_subdevice = s->index; |
|
else |
|
devinfo.read_subdevice = -1; |
|
|
|
s = comedi_file_write_subdevice(file); |
|
if (s) |
|
devinfo.write_subdevice = s->index; |
|
else |
|
devinfo.write_subdevice = -1; |
|
|
|
if (copy_to_user(arg, &devinfo, sizeof(devinfo))) |
|
return -EFAULT; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* COMEDI_SUBDINFO ioctl |
|
* subdevices info |
|
* |
|
* arg: |
|
* pointer to array of comedi_subdinfo structures |
|
* |
|
* reads: |
|
* nothing |
|
* |
|
* writes: |
|
* array of comedi_subdinfo structures |
|
*/ |
|
static int do_subdinfo_ioctl(struct comedi_device *dev, |
|
struct comedi_subdinfo __user *arg, void *file) |
|
{ |
|
int ret, i; |
|
struct comedi_subdinfo *tmp, *us; |
|
struct comedi_subdevice *s; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL); |
|
if (!tmp) |
|
return -ENOMEM; |
|
|
|
/* fill subdinfo structs */ |
|
for (i = 0; i < dev->n_subdevices; i++) { |
|
s = &dev->subdevices[i]; |
|
us = tmp + i; |
|
|
|
us->type = s->type; |
|
us->n_chan = s->n_chan; |
|
us->subd_flags = s->subdev_flags; |
|
if (comedi_is_subdevice_running(s)) |
|
us->subd_flags |= SDF_RUNNING; |
|
#define TIMER_nanosec 5 /* backwards compatibility */ |
|
us->timer_type = TIMER_nanosec; |
|
us->len_chanlist = s->len_chanlist; |
|
us->maxdata = s->maxdata; |
|
if (s->range_table) { |
|
us->range_type = |
|
(i << 24) | (0 << 16) | (s->range_table->length); |
|
} else { |
|
us->range_type = 0; /* XXX */ |
|
} |
|
|
|
if (s->busy) |
|
us->subd_flags |= SDF_BUSY; |
|
if (s->busy == file) |
|
us->subd_flags |= SDF_BUSY_OWNER; |
|
if (s->lock) |
|
us->subd_flags |= SDF_LOCKED; |
|
if (s->lock == file) |
|
us->subd_flags |= SDF_LOCK_OWNER; |
|
if (!s->maxdata && s->maxdata_list) |
|
us->subd_flags |= SDF_MAXDATA; |
|
if (s->range_table_list) |
|
us->subd_flags |= SDF_RANGETYPE; |
|
if (s->do_cmd) |
|
us->subd_flags |= SDF_CMD; |
|
|
|
if (s->insn_bits != &insn_inval) |
|
us->insn_bits_support = COMEDI_SUPPORTED; |
|
else |
|
us->insn_bits_support = COMEDI_UNSUPPORTED; |
|
} |
|
|
|
ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp)); |
|
|
|
kfree(tmp); |
|
|
|
return ret ? -EFAULT : 0; |
|
} |
|
|
|
/* |
|
* COMEDI_CHANINFO ioctl |
|
* subdevice channel info |
|
* |
|
* arg: |
|
* pointer to comedi_chaninfo structure |
|
* |
|
* reads: |
|
* comedi_chaninfo structure |
|
* |
|
* writes: |
|
* array of maxdata values to chaninfo->maxdata_list if requested |
|
* array of range table lengths to chaninfo->range_table_list if requested |
|
*/ |
|
static int do_chaninfo_ioctl(struct comedi_device *dev, |
|
struct comedi_chaninfo *it) |
|
{ |
|
struct comedi_subdevice *s; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
|
|
if (it->subdev >= dev->n_subdevices) |
|
return -EINVAL; |
|
s = &dev->subdevices[it->subdev]; |
|
|
|
if (it->maxdata_list) { |
|
if (s->maxdata || !s->maxdata_list) |
|
return -EINVAL; |
|
if (copy_to_user(it->maxdata_list, s->maxdata_list, |
|
s->n_chan * sizeof(unsigned int))) |
|
return -EFAULT; |
|
} |
|
|
|
if (it->flaglist) |
|
return -EINVAL; /* flaglist not supported */ |
|
|
|
if (it->rangelist) { |
|
int i; |
|
|
|
if (!s->range_table_list) |
|
return -EINVAL; |
|
for (i = 0; i < s->n_chan; i++) { |
|
int x; |
|
|
|
x = (dev->minor << 28) | (it->subdev << 24) | (i << 16) | |
|
(s->range_table_list[i]->length); |
|
if (put_user(x, it->rangelist + i)) |
|
return -EFAULT; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* COMEDI_BUFINFO ioctl |
|
* buffer information |
|
* |
|
* arg: |
|
* pointer to comedi_bufinfo structure |
|
* |
|
* reads: |
|
* comedi_bufinfo structure |
|
* |
|
* writes: |
|
* modified comedi_bufinfo structure |
|
*/ |
|
static int do_bufinfo_ioctl(struct comedi_device *dev, |
|
struct comedi_bufinfo __user *arg, void *file) |
|
{ |
|
struct comedi_bufinfo bi; |
|
struct comedi_subdevice *s; |
|
struct comedi_async *async; |
|
unsigned int runflags; |
|
int retval = 0; |
|
bool become_nonbusy = false; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
if (copy_from_user(&bi, arg, sizeof(bi))) |
|
return -EFAULT; |
|
|
|
if (bi.subdevice >= dev->n_subdevices) |
|
return -EINVAL; |
|
|
|
s = &dev->subdevices[bi.subdevice]; |
|
|
|
async = s->async; |
|
|
|
if (!async || s->busy != file) |
|
return -EINVAL; |
|
|
|
runflags = comedi_get_subdevice_runflags(s); |
|
if (!(async->cmd.flags & CMDF_WRITE)) { |
|
/* command was set up in "read" direction */ |
|
if (bi.bytes_read) { |
|
comedi_buf_read_alloc(s, bi.bytes_read); |
|
bi.bytes_read = comedi_buf_read_free(s, bi.bytes_read); |
|
} |
|
/* |
|
* If nothing left to read, and command has stopped, and |
|
* {"read" position not updated or command stopped normally}, |
|
* then become non-busy. |
|
*/ |
|
if (comedi_buf_read_n_available(s) == 0 && |
|
!comedi_is_runflags_running(runflags) && |
|
(bi.bytes_read == 0 || |
|
!comedi_is_runflags_in_error(runflags))) { |
|
become_nonbusy = true; |
|
if (comedi_is_runflags_in_error(runflags)) |
|
retval = -EPIPE; |
|
} |
|
bi.bytes_written = 0; |
|
} else { |
|
/* command was set up in "write" direction */ |
|
if (!comedi_is_runflags_running(runflags)) { |
|
bi.bytes_written = 0; |
|
become_nonbusy = true; |
|
if (comedi_is_runflags_in_error(runflags)) |
|
retval = -EPIPE; |
|
} else if (bi.bytes_written) { |
|
comedi_buf_write_alloc(s, bi.bytes_written); |
|
bi.bytes_written = |
|
comedi_buf_write_free(s, bi.bytes_written); |
|
} |
|
bi.bytes_read = 0; |
|
} |
|
|
|
bi.buf_write_count = async->buf_write_count; |
|
bi.buf_write_ptr = async->buf_write_ptr; |
|
bi.buf_read_count = async->buf_read_count; |
|
bi.buf_read_ptr = async->buf_read_ptr; |
|
|
|
if (become_nonbusy) |
|
do_become_nonbusy(dev, s); |
|
|
|
if (retval) |
|
return retval; |
|
|
|
if (copy_to_user(arg, &bi, sizeof(bi))) |
|
return -EFAULT; |
|
|
|
return 0; |
|
} |
|
|
|
static int check_insn_config_length(struct comedi_insn *insn, |
|
unsigned int *data) |
|
{ |
|
if (insn->n < 1) |
|
return -EINVAL; |
|
|
|
switch (data[0]) { |
|
case INSN_CONFIG_DIO_OUTPUT: |
|
case INSN_CONFIG_DIO_INPUT: |
|
case INSN_CONFIG_DISARM: |
|
case INSN_CONFIG_RESET: |
|
if (insn->n == 1) |
|
return 0; |
|
break; |
|
case INSN_CONFIG_ARM: |
|
case INSN_CONFIG_DIO_QUERY: |
|
case INSN_CONFIG_BLOCK_SIZE: |
|
case INSN_CONFIG_FILTER: |
|
case INSN_CONFIG_SERIAL_CLOCK: |
|
case INSN_CONFIG_BIDIRECTIONAL_DATA: |
|
case INSN_CONFIG_ALT_SOURCE: |
|
case INSN_CONFIG_SET_COUNTER_MODE: |
|
case INSN_CONFIG_8254_READ_STATUS: |
|
case INSN_CONFIG_SET_ROUTING: |
|
case INSN_CONFIG_GET_ROUTING: |
|
case INSN_CONFIG_GET_PWM_STATUS: |
|
case INSN_CONFIG_PWM_SET_PERIOD: |
|
case INSN_CONFIG_PWM_GET_PERIOD: |
|
if (insn->n == 2) |
|
return 0; |
|
break; |
|
case INSN_CONFIG_SET_GATE_SRC: |
|
case INSN_CONFIG_GET_GATE_SRC: |
|
case INSN_CONFIG_SET_CLOCK_SRC: |
|
case INSN_CONFIG_GET_CLOCK_SRC: |
|
case INSN_CONFIG_SET_OTHER_SRC: |
|
case INSN_CONFIG_GET_COUNTER_STATUS: |
|
case INSN_CONFIG_PWM_SET_H_BRIDGE: |
|
case INSN_CONFIG_PWM_GET_H_BRIDGE: |
|
case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: |
|
if (insn->n == 3) |
|
return 0; |
|
break; |
|
case INSN_CONFIG_PWM_OUTPUT: |
|
case INSN_CONFIG_ANALOG_TRIG: |
|
case INSN_CONFIG_TIMER_1: |
|
if (insn->n == 5) |
|
return 0; |
|
break; |
|
case INSN_CONFIG_DIGITAL_TRIG: |
|
if (insn->n == 6) |
|
return 0; |
|
break; |
|
case INSN_CONFIG_GET_CMD_TIMING_CONSTRAINTS: |
|
if (insn->n >= 4) |
|
return 0; |
|
break; |
|
/* |
|
* by default we allow the insn since we don't have checks for |
|
* all possible cases yet |
|
*/ |
|
default: |
|
pr_warn("No check for data length of config insn id %i is implemented\n", |
|
data[0]); |
|
pr_warn("Add a check to %s in %s\n", __func__, __FILE__); |
|
pr_warn("Assuming n=%i is correct\n", insn->n); |
|
return 0; |
|
} |
|
return -EINVAL; |
|
} |
|
|
|
static int check_insn_device_config_length(struct comedi_insn *insn, |
|
unsigned int *data) |
|
{ |
|
if (insn->n < 1) |
|
return -EINVAL; |
|
|
|
switch (data[0]) { |
|
case INSN_DEVICE_CONFIG_TEST_ROUTE: |
|
case INSN_DEVICE_CONFIG_CONNECT_ROUTE: |
|
case INSN_DEVICE_CONFIG_DISCONNECT_ROUTE: |
|
if (insn->n == 3) |
|
return 0; |
|
break; |
|
case INSN_DEVICE_CONFIG_GET_ROUTES: |
|
/* |
|
* Big enough for config_id and the length of the userland |
|
* memory buffer. Additional length should be in factors of 2 |
|
* to communicate any returned route pairs (source,destination). |
|
*/ |
|
if (insn->n >= 2) |
|
return 0; |
|
break; |
|
} |
|
return -EINVAL; |
|
} |
|
|
|
/** |
|
* get_valid_routes() - Calls low-level driver get_valid_routes function to |
|
* either return a count of valid routes to user, or copy |
|
* of list of all valid device routes to buffer in |
|
* userspace. |
|
* @dev: comedi device pointer |
|
* @data: data from user insn call. The length of the data must be >= 2. |
|
* data[0] must contain the INSN_DEVICE_CONFIG config_id. |
|
* data[1](input) contains the number of _pairs_ for which memory is |
|
* allotted from the user. If the user specifies '0', then only |
|
* the number of pairs available is returned. |
|
* data[1](output) returns either the number of pairs available (if none |
|
* where requested) or the number of _pairs_ that are copied back |
|
* to the user. |
|
* data[2::2] returns each (source, destination) pair. |
|
* |
|
* Return: -EINVAL if low-level driver does not allocate and return routes as |
|
* expected. Returns 0 otherwise. |
|
*/ |
|
static int get_valid_routes(struct comedi_device *dev, unsigned int *data) |
|
{ |
|
lockdep_assert_held(&dev->mutex); |
|
data[1] = dev->get_valid_routes(dev, data[1], data + 2); |
|
return 0; |
|
} |
|
|
|
static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn, |
|
unsigned int *data, void *file) |
|
{ |
|
struct comedi_subdevice *s; |
|
int ret = 0; |
|
int i; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
if (insn->insn & INSN_MASK_SPECIAL) { |
|
/* a non-subdevice instruction */ |
|
|
|
switch (insn->insn) { |
|
case INSN_GTOD: |
|
{ |
|
struct timespec64 tv; |
|
|
|
if (insn->n != 2) { |
|
ret = -EINVAL; |
|
break; |
|
} |
|
|
|
ktime_get_real_ts64(&tv); |
|
/* unsigned data safe until 2106 */ |
|
data[0] = (unsigned int)tv.tv_sec; |
|
data[1] = tv.tv_nsec / NSEC_PER_USEC; |
|
ret = 2; |
|
|
|
break; |
|
} |
|
case INSN_WAIT: |
|
if (insn->n != 1 || data[0] >= 100000) { |
|
ret = -EINVAL; |
|
break; |
|
} |
|
udelay(data[0] / 1000); |
|
ret = 1; |
|
break; |
|
case INSN_INTTRIG: |
|
if (insn->n != 1) { |
|
ret = -EINVAL; |
|
break; |
|
} |
|
if (insn->subdev >= dev->n_subdevices) { |
|
dev_dbg(dev->class_dev, |
|
"%d not usable subdevice\n", |
|
insn->subdev); |
|
ret = -EINVAL; |
|
break; |
|
} |
|
s = &dev->subdevices[insn->subdev]; |
|
if (!s->async) { |
|
dev_dbg(dev->class_dev, "no async\n"); |
|
ret = -EINVAL; |
|
break; |
|
} |
|
if (!s->async->inttrig) { |
|
dev_dbg(dev->class_dev, "no inttrig\n"); |
|
ret = -EAGAIN; |
|
break; |
|
} |
|
ret = s->async->inttrig(dev, s, data[0]); |
|
if (ret >= 0) |
|
ret = 1; |
|
break; |
|
case INSN_DEVICE_CONFIG: |
|
ret = check_insn_device_config_length(insn, data); |
|
if (ret) |
|
break; |
|
|
|
if (data[0] == INSN_DEVICE_CONFIG_GET_ROUTES) { |
|
/* |
|
* data[1] should be the number of _pairs_ that |
|
* the memory can hold. |
|
*/ |
|
data[1] = (insn->n - 2) / 2; |
|
ret = get_valid_routes(dev, data); |
|
break; |
|
} |
|
|
|
/* other global device config instructions. */ |
|
ret = dev->insn_device_config(dev, insn, data); |
|
break; |
|
default: |
|
dev_dbg(dev->class_dev, "invalid insn\n"); |
|
ret = -EINVAL; |
|
break; |
|
} |
|
} else { |
|
/* a subdevice instruction */ |
|
unsigned int maxdata; |
|
|
|
if (insn->subdev >= dev->n_subdevices) { |
|
dev_dbg(dev->class_dev, "subdevice %d out of range\n", |
|
insn->subdev); |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
s = &dev->subdevices[insn->subdev]; |
|
|
|
if (s->type == COMEDI_SUBD_UNUSED) { |
|
dev_dbg(dev->class_dev, "%d not usable subdevice\n", |
|
insn->subdev); |
|
ret = -EIO; |
|
goto out; |
|
} |
|
|
|
/* are we locked? (ioctl lock) */ |
|
if (s->lock && s->lock != file) { |
|
dev_dbg(dev->class_dev, "device locked\n"); |
|
ret = -EACCES; |
|
goto out; |
|
} |
|
|
|
ret = comedi_check_chanlist(s, 1, &insn->chanspec); |
|
if (ret < 0) { |
|
ret = -EINVAL; |
|
dev_dbg(dev->class_dev, "bad chanspec\n"); |
|
goto out; |
|
} |
|
|
|
if (s->busy) { |
|
ret = -EBUSY; |
|
goto out; |
|
} |
|
/* This looks arbitrary. It is. */ |
|
s->busy = parse_insn; |
|
switch (insn->insn) { |
|
case INSN_READ: |
|
ret = s->insn_read(dev, s, insn, data); |
|
if (ret == -ETIMEDOUT) { |
|
dev_dbg(dev->class_dev, |
|
"subdevice %d read instruction timed out\n", |
|
s->index); |
|
} |
|
break; |
|
case INSN_WRITE: |
|
maxdata = s->maxdata_list |
|
? s->maxdata_list[CR_CHAN(insn->chanspec)] |
|
: s->maxdata; |
|
for (i = 0; i < insn->n; ++i) { |
|
if (data[i] > maxdata) { |
|
ret = -EINVAL; |
|
dev_dbg(dev->class_dev, |
|
"bad data value(s)\n"); |
|
break; |
|
} |
|
} |
|
if (ret == 0) { |
|
ret = s->insn_write(dev, s, insn, data); |
|
if (ret == -ETIMEDOUT) { |
|
dev_dbg(dev->class_dev, |
|
"subdevice %d write instruction timed out\n", |
|
s->index); |
|
} |
|
} |
|
break; |
|
case INSN_BITS: |
|
if (insn->n != 2) { |
|
ret = -EINVAL; |
|
} else { |
|
/* |
|
* Most drivers ignore the base channel in |
|
* insn->chanspec. Fix this here if |
|
* the subdevice has <= 32 channels. |
|
*/ |
|
unsigned int orig_mask = data[0]; |
|
unsigned int shift = 0; |
|
|
|
if (s->n_chan <= 32) { |
|
shift = CR_CHAN(insn->chanspec); |
|
if (shift > 0) { |
|
insn->chanspec = 0; |
|
data[0] <<= shift; |
|
data[1] <<= shift; |
|
} |
|
} |
|
ret = s->insn_bits(dev, s, insn, data); |
|
data[0] = orig_mask; |
|
if (shift > 0) |
|
data[1] >>= shift; |
|
} |
|
break; |
|
case INSN_CONFIG: |
|
ret = check_insn_config_length(insn, data); |
|
if (ret) |
|
break; |
|
ret = s->insn_config(dev, s, insn, data); |
|
break; |
|
default: |
|
ret = -EINVAL; |
|
break; |
|
} |
|
|
|
s->busy = NULL; |
|
} |
|
|
|
out: |
|
return ret; |
|
} |
|
|
|
/* |
|
* COMEDI_INSNLIST ioctl |
|
* synchronous instruction list |
|
* |
|
* arg: |
|
* pointer to comedi_insnlist structure |
|
* |
|
* reads: |
|
* comedi_insnlist structure |
|
* array of comedi_insn structures from insnlist->insns pointer |
|
* data (for writes) from insns[].data pointers |
|
* |
|
* writes: |
|
* data (for reads) to insns[].data pointers |
|
*/ |
|
/* arbitrary limits */ |
|
#define MIN_SAMPLES 16 |
|
#define MAX_SAMPLES 65536 |
|
static int do_insnlist_ioctl(struct comedi_device *dev, |
|
struct comedi_insn *insns, |
|
unsigned int n_insns, |
|
void *file) |
|
{ |
|
unsigned int *data = NULL; |
|
unsigned int max_n_data_required = MIN_SAMPLES; |
|
int i = 0; |
|
int ret = 0; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
|
|
/* Determine maximum memory needed for all instructions. */ |
|
for (i = 0; i < n_insns; ++i) { |
|
if (insns[i].n > MAX_SAMPLES) { |
|
dev_dbg(dev->class_dev, |
|
"number of samples too large\n"); |
|
ret = -EINVAL; |
|
goto error; |
|
} |
|
max_n_data_required = max(max_n_data_required, insns[i].n); |
|
} |
|
|
|
/* Allocate scratch space for all instruction data. */ |
|
data = kmalloc_array(max_n_data_required, sizeof(unsigned int), |
|
GFP_KERNEL); |
|
if (!data) { |
|
ret = -ENOMEM; |
|
goto error; |
|
} |
|
|
|
for (i = 0; i < n_insns; ++i) { |
|
if (insns[i].insn & INSN_MASK_WRITE) { |
|
if (copy_from_user(data, insns[i].data, |
|
insns[i].n * sizeof(unsigned int))) { |
|
dev_dbg(dev->class_dev, |
|
"copy_from_user failed\n"); |
|
ret = -EFAULT; |
|
goto error; |
|
} |
|
} |
|
ret = parse_insn(dev, insns + i, data, file); |
|
if (ret < 0) |
|
goto error; |
|
if (insns[i].insn & INSN_MASK_READ) { |
|
if (copy_to_user(insns[i].data, data, |
|
insns[i].n * sizeof(unsigned int))) { |
|
dev_dbg(dev->class_dev, |
|
"copy_to_user failed\n"); |
|
ret = -EFAULT; |
|
goto error; |
|
} |
|
} |
|
if (need_resched()) |
|
schedule(); |
|
} |
|
|
|
error: |
|
kfree(data); |
|
|
|
if (ret < 0) |
|
return ret; |
|
return i; |
|
} |
|
|
|
/* |
|
* COMEDI_INSN ioctl |
|
* synchronous instruction |
|
* |
|
* arg: |
|
* pointer to comedi_insn structure |
|
* |
|
* reads: |
|
* comedi_insn structure |
|
* data (for writes) from insn->data pointer |
|
* |
|
* writes: |
|
* data (for reads) to insn->data pointer |
|
*/ |
|
static int do_insn_ioctl(struct comedi_device *dev, |
|
struct comedi_insn *insn, void *file) |
|
{ |
|
unsigned int *data = NULL; |
|
unsigned int n_data = MIN_SAMPLES; |
|
int ret = 0; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
|
|
n_data = max(n_data, insn->n); |
|
|
|
/* This is where the behavior of insn and insnlist deviate. */ |
|
if (insn->n > MAX_SAMPLES) { |
|
insn->n = MAX_SAMPLES; |
|
n_data = MAX_SAMPLES; |
|
} |
|
|
|
data = kmalloc_array(n_data, sizeof(unsigned int), GFP_KERNEL); |
|
if (!data) { |
|
ret = -ENOMEM; |
|
goto error; |
|
} |
|
|
|
if (insn->insn & INSN_MASK_WRITE) { |
|
if (copy_from_user(data, |
|
insn->data, |
|
insn->n * sizeof(unsigned int))) { |
|
ret = -EFAULT; |
|
goto error; |
|
} |
|
} |
|
ret = parse_insn(dev, insn, data, file); |
|
if (ret < 0) |
|
goto error; |
|
if (insn->insn & INSN_MASK_READ) { |
|
if (copy_to_user(insn->data, |
|
data, |
|
insn->n * sizeof(unsigned int))) { |
|
ret = -EFAULT; |
|
goto error; |
|
} |
|
} |
|
ret = insn->n; |
|
|
|
error: |
|
kfree(data); |
|
|
|
return ret; |
|
} |
|
|
|
static int __comedi_get_user_cmd(struct comedi_device *dev, |
|
struct comedi_cmd *cmd) |
|
{ |
|
struct comedi_subdevice *s; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
if (cmd->subdev >= dev->n_subdevices) { |
|
dev_dbg(dev->class_dev, "%d no such subdevice\n", cmd->subdev); |
|
return -ENODEV; |
|
} |
|
|
|
s = &dev->subdevices[cmd->subdev]; |
|
|
|
if (s->type == COMEDI_SUBD_UNUSED) { |
|
dev_dbg(dev->class_dev, "%d not valid subdevice\n", |
|
cmd->subdev); |
|
return -EIO; |
|
} |
|
|
|
if (!s->do_cmd || !s->do_cmdtest || !s->async) { |
|
dev_dbg(dev->class_dev, |
|
"subdevice %d does not support commands\n", |
|
cmd->subdev); |
|
return -EIO; |
|
} |
|
|
|
/* make sure channel/gain list isn't too long */ |
|
if (cmd->chanlist_len > s->len_chanlist) { |
|
dev_dbg(dev->class_dev, "channel/gain list too long %d > %d\n", |
|
cmd->chanlist_len, s->len_chanlist); |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* Set the CMDF_WRITE flag to the correct state if the subdevice |
|
* supports only "read" commands or only "write" commands. |
|
*/ |
|
switch (s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) { |
|
case SDF_CMD_READ: |
|
cmd->flags &= ~CMDF_WRITE; |
|
break; |
|
case SDF_CMD_WRITE: |
|
cmd->flags |= CMDF_WRITE; |
|
break; |
|
default: |
|
break; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int __comedi_get_user_chanlist(struct comedi_device *dev, |
|
struct comedi_subdevice *s, |
|
unsigned int __user *user_chanlist, |
|
struct comedi_cmd *cmd) |
|
{ |
|
unsigned int *chanlist; |
|
int ret; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
cmd->chanlist = NULL; |
|
chanlist = memdup_user(user_chanlist, |
|
cmd->chanlist_len * sizeof(unsigned int)); |
|
if (IS_ERR(chanlist)) |
|
return PTR_ERR(chanlist); |
|
|
|
/* make sure each element in channel/gain list is valid */ |
|
ret = comedi_check_chanlist(s, cmd->chanlist_len, chanlist); |
|
if (ret < 0) { |
|
kfree(chanlist); |
|
return ret; |
|
} |
|
|
|
cmd->chanlist = chanlist; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* COMEDI_CMD ioctl |
|
* asynchronous acquisition command set-up |
|
* |
|
* arg: |
|
* pointer to comedi_cmd structure |
|
* |
|
* reads: |
|
* comedi_cmd structure |
|
* channel/range list from cmd->chanlist pointer |
|
* |
|
* writes: |
|
* possibly modified comedi_cmd structure (when -EAGAIN returned) |
|
*/ |
|
static int do_cmd_ioctl(struct comedi_device *dev, |
|
struct comedi_cmd *cmd, bool *copy, void *file) |
|
{ |
|
struct comedi_subdevice *s; |
|
struct comedi_async *async; |
|
unsigned int __user *user_chanlist; |
|
int ret; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
|
|
/* do some simple cmd validation */ |
|
ret = __comedi_get_user_cmd(dev, cmd); |
|
if (ret) |
|
return ret; |
|
|
|
/* save user's chanlist pointer so it can be restored later */ |
|
user_chanlist = (unsigned int __user *)cmd->chanlist; |
|
|
|
s = &dev->subdevices[cmd->subdev]; |
|
async = s->async; |
|
|
|
/* are we locked? (ioctl lock) */ |
|
if (s->lock && s->lock != file) { |
|
dev_dbg(dev->class_dev, "subdevice locked\n"); |
|
return -EACCES; |
|
} |
|
|
|
/* are we busy? */ |
|
if (s->busy) { |
|
dev_dbg(dev->class_dev, "subdevice busy\n"); |
|
return -EBUSY; |
|
} |
|
|
|
/* make sure channel/gain list isn't too short */ |
|
if (cmd->chanlist_len < 1) { |
|
dev_dbg(dev->class_dev, "channel/gain list too short %u < 1\n", |
|
cmd->chanlist_len); |
|
return -EINVAL; |
|
} |
|
|
|
async->cmd = *cmd; |
|
async->cmd.data = NULL; |
|
|
|
/* load channel/gain list */ |
|
ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &async->cmd); |
|
if (ret) |
|
goto cleanup; |
|
|
|
ret = s->do_cmdtest(dev, s, &async->cmd); |
|
|
|
if (async->cmd.flags & CMDF_BOGUS || ret) { |
|
dev_dbg(dev->class_dev, "test returned %d\n", ret); |
|
*cmd = async->cmd; |
|
/* restore chanlist pointer before copying back */ |
|
cmd->chanlist = (unsigned int __force *)user_chanlist; |
|
cmd->data = NULL; |
|
*copy = true; |
|
ret = -EAGAIN; |
|
goto cleanup; |
|
} |
|
|
|
if (!async->prealloc_bufsz) { |
|
ret = -ENOMEM; |
|
dev_dbg(dev->class_dev, "no buffer (?)\n"); |
|
goto cleanup; |
|
} |
|
|
|
comedi_buf_reset(s); |
|
|
|
async->cb_mask = COMEDI_CB_BLOCK | COMEDI_CB_CANCEL_MASK; |
|
if (async->cmd.flags & CMDF_WAKE_EOS) |
|
async->cb_mask |= COMEDI_CB_EOS; |
|
|
|
comedi_update_subdevice_runflags(s, COMEDI_SRF_BUSY_MASK, |
|
COMEDI_SRF_RUNNING); |
|
|
|
/* |
|
* Set s->busy _after_ setting COMEDI_SRF_RUNNING flag to avoid |
|
* race with comedi_read() or comedi_write(). |
|
*/ |
|
s->busy = file; |
|
ret = s->do_cmd(dev, s); |
|
if (ret == 0) |
|
return 0; |
|
|
|
cleanup: |
|
do_become_nonbusy(dev, s); |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* COMEDI_CMDTEST ioctl |
|
* asynchronous acquisition command testing |
|
* |
|
* arg: |
|
* pointer to comedi_cmd structure |
|
* |
|
* reads: |
|
* comedi_cmd structure |
|
* channel/range list from cmd->chanlist pointer |
|
* |
|
* writes: |
|
* possibly modified comedi_cmd structure |
|
*/ |
|
static int do_cmdtest_ioctl(struct comedi_device *dev, |
|
struct comedi_cmd *cmd, bool *copy, void *file) |
|
{ |
|
struct comedi_subdevice *s; |
|
unsigned int __user *user_chanlist; |
|
int ret; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
|
|
/* do some simple cmd validation */ |
|
ret = __comedi_get_user_cmd(dev, cmd); |
|
if (ret) |
|
return ret; |
|
|
|
/* save user's chanlist pointer so it can be restored later */ |
|
user_chanlist = (unsigned int __user *)cmd->chanlist; |
|
|
|
s = &dev->subdevices[cmd->subdev]; |
|
|
|
/* user_chanlist can be NULL for COMEDI_CMDTEST ioctl */ |
|
if (user_chanlist) { |
|
/* load channel/gain list */ |
|
ret = __comedi_get_user_chanlist(dev, s, user_chanlist, cmd); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
ret = s->do_cmdtest(dev, s, cmd); |
|
|
|
kfree(cmd->chanlist); /* free kernel copy of user chanlist */ |
|
|
|
/* restore chanlist pointer before copying back */ |
|
cmd->chanlist = (unsigned int __force *)user_chanlist; |
|
*copy = true; |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* COMEDI_LOCK ioctl |
|
* lock subdevice |
|
* |
|
* arg: |
|
* subdevice number |
|
* |
|
* reads: |
|
* nothing |
|
* |
|
* writes: |
|
* nothing |
|
*/ |
|
static int do_lock_ioctl(struct comedi_device *dev, unsigned long arg, |
|
void *file) |
|
{ |
|
int ret = 0; |
|
unsigned long flags; |
|
struct comedi_subdevice *s; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
if (arg >= dev->n_subdevices) |
|
return -EINVAL; |
|
s = &dev->subdevices[arg]; |
|
|
|
spin_lock_irqsave(&s->spin_lock, flags); |
|
if (s->busy || s->lock) |
|
ret = -EBUSY; |
|
else |
|
s->lock = file; |
|
spin_unlock_irqrestore(&s->spin_lock, flags); |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* COMEDI_UNLOCK ioctl |
|
* unlock subdevice |
|
* |
|
* arg: |
|
* subdevice number |
|
* |
|
* reads: |
|
* nothing |
|
* |
|
* writes: |
|
* nothing |
|
*/ |
|
static int do_unlock_ioctl(struct comedi_device *dev, unsigned long arg, |
|
void *file) |
|
{ |
|
struct comedi_subdevice *s; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
if (arg >= dev->n_subdevices) |
|
return -EINVAL; |
|
s = &dev->subdevices[arg]; |
|
|
|
if (s->busy) |
|
return -EBUSY; |
|
|
|
if (s->lock && s->lock != file) |
|
return -EACCES; |
|
|
|
if (s->lock == file) |
|
s->lock = NULL; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* COMEDI_CANCEL ioctl |
|
* cancel asynchronous acquisition |
|
* |
|
* arg: |
|
* subdevice number |
|
* |
|
* reads: |
|
* nothing |
|
* |
|
* writes: |
|
* nothing |
|
*/ |
|
static int do_cancel_ioctl(struct comedi_device *dev, unsigned long arg, |
|
void *file) |
|
{ |
|
struct comedi_subdevice *s; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
if (arg >= dev->n_subdevices) |
|
return -EINVAL; |
|
s = &dev->subdevices[arg]; |
|
if (!s->async) |
|
return -EINVAL; |
|
|
|
if (!s->busy) |
|
return 0; |
|
|
|
if (s->busy != file) |
|
return -EBUSY; |
|
|
|
return do_cancel(dev, s); |
|
} |
|
|
|
/* |
|
* COMEDI_POLL ioctl |
|
* instructs driver to synchronize buffers |
|
* |
|
* arg: |
|
* subdevice number |
|
* |
|
* reads: |
|
* nothing |
|
* |
|
* writes: |
|
* nothing |
|
*/ |
|
static int do_poll_ioctl(struct comedi_device *dev, unsigned long arg, |
|
void *file) |
|
{ |
|
struct comedi_subdevice *s; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
if (arg >= dev->n_subdevices) |
|
return -EINVAL; |
|
s = &dev->subdevices[arg]; |
|
|
|
if (!s->busy) |
|
return 0; |
|
|
|
if (s->busy != file) |
|
return -EBUSY; |
|
|
|
if (s->poll) |
|
return s->poll(dev, s); |
|
|
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* COMEDI_SETRSUBD ioctl |
|
* sets the current "read" subdevice on a per-file basis |
|
* |
|
* arg: |
|
* subdevice number |
|
* |
|
* reads: |
|
* nothing |
|
* |
|
* writes: |
|
* nothing |
|
*/ |
|
static int do_setrsubd_ioctl(struct comedi_device *dev, unsigned long arg, |
|
struct file *file) |
|
{ |
|
struct comedi_file *cfp = file->private_data; |
|
struct comedi_subdevice *s_old, *s_new; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
if (arg >= dev->n_subdevices) |
|
return -EINVAL; |
|
|
|
s_new = &dev->subdevices[arg]; |
|
s_old = comedi_file_read_subdevice(file); |
|
if (s_old == s_new) |
|
return 0; /* no change */ |
|
|
|
if (!(s_new->subdev_flags & SDF_CMD_READ)) |
|
return -EINVAL; |
|
|
|
/* |
|
* Check the file isn't still busy handling a "read" command on the |
|
* old subdevice (if any). |
|
*/ |
|
if (s_old && s_old->busy == file && s_old->async && |
|
!(s_old->async->cmd.flags & CMDF_WRITE)) |
|
return -EBUSY; |
|
|
|
WRITE_ONCE(cfp->read_subdev, s_new); |
|
return 0; |
|
} |
|
|
|
/* |
|
* COMEDI_SETWSUBD ioctl |
|
* sets the current "write" subdevice on a per-file basis |
|
* |
|
* arg: |
|
* subdevice number |
|
* |
|
* reads: |
|
* nothing |
|
* |
|
* writes: |
|
* nothing |
|
*/ |
|
static int do_setwsubd_ioctl(struct comedi_device *dev, unsigned long arg, |
|
struct file *file) |
|
{ |
|
struct comedi_file *cfp = file->private_data; |
|
struct comedi_subdevice *s_old, *s_new; |
|
|
|
lockdep_assert_held(&dev->mutex); |
|
if (arg >= dev->n_subdevices) |
|
return -EINVAL; |
|
|
|
s_new = &dev->subdevices[arg]; |
|
s_old = comedi_file_write_subdevice(file); |
|
if (s_old == s_new) |
|
return 0; /* no change */ |
|
|
|
if (!(s_new->subdev_flags & SDF_CMD_WRITE)) |
|
return -EINVAL; |
|
|
|
/* |
|
* Check the file isn't still busy handling a "write" command on the |
|
* old subdevice (if any). |
|
*/ |
|
if (s_old && s_old->busy == file && s_old->async && |
|
(s_old->async->cmd.flags & CMDF_WRITE)) |
|
return -EBUSY; |
|
|
|
WRITE_ONCE(cfp->write_subdev, s_new); |
|
return 0; |
|
} |
|
|
|
static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, |
|
unsigned long arg) |
|
{ |
|
unsigned int minor = iminor(file_inode(file)); |
|
struct comedi_file *cfp = file->private_data; |
|
struct comedi_device *dev = cfp->dev; |
|
int rc; |
|
|
|
mutex_lock(&dev->mutex); |
|
|
|
/* |
|
* Device config is special, because it must work on |
|
* an unconfigured device. |
|
*/ |
|
if (cmd == COMEDI_DEVCONFIG) { |
|
if (minor >= COMEDI_NUM_BOARD_MINORS) { |
|
/* Device config not appropriate on non-board minors. */ |
|
rc = -ENOTTY; |
|
goto done; |
|
} |
|
rc = do_devconfig_ioctl(dev, |
|
(struct comedi_devconfig __user *)arg); |
|
if (rc == 0) { |
|
if (arg == 0 && |
|
dev->minor >= comedi_num_legacy_minors) { |
|
/* |
|
* Successfully unconfigured a dynamically |
|
* allocated device. Try and remove it. |
|
*/ |
|
if (comedi_clear_board_dev(dev)) { |
|
mutex_unlock(&dev->mutex); |
|
comedi_free_board_dev(dev); |
|
return rc; |
|
} |
|
} |
|
} |
|
goto done; |
|
} |
|
|
|
if (!dev->attached) { |
|
dev_dbg(dev->class_dev, "no driver attached\n"); |
|
rc = -ENODEV; |
|
goto done; |
|
} |
|
|
|
switch (cmd) { |
|
case COMEDI_BUFCONFIG: |
|
rc = do_bufconfig_ioctl(dev, |
|
(struct comedi_bufconfig __user *)arg); |
|
break; |
|
case COMEDI_DEVINFO: |
|
rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg, |
|
file); |
|
break; |
|
case COMEDI_SUBDINFO: |
|
rc = do_subdinfo_ioctl(dev, |
|
(struct comedi_subdinfo __user *)arg, |
|
file); |
|
break; |
|
case COMEDI_CHANINFO: { |
|
struct comedi_chaninfo it; |
|
|
|
if (copy_from_user(&it, (void __user *)arg, sizeof(it))) |
|
rc = -EFAULT; |
|
else |
|
rc = do_chaninfo_ioctl(dev, &it); |
|
break; |
|
} |
|
case COMEDI_RANGEINFO: { |
|
struct comedi_rangeinfo it; |
|
|
|
if (copy_from_user(&it, (void __user *)arg, sizeof(it))) |
|
rc = -EFAULT; |
|
else |
|
rc = do_rangeinfo_ioctl(dev, &it); |
|
break; |
|
} |
|
case COMEDI_BUFINFO: |
|
rc = do_bufinfo_ioctl(dev, |
|
(struct comedi_bufinfo __user *)arg, |
|
file); |
|
break; |
|
case COMEDI_LOCK: |
|
rc = do_lock_ioctl(dev, arg, file); |
|
break; |
|
case COMEDI_UNLOCK: |
|
rc = do_unlock_ioctl(dev, arg, file); |
|
break; |
|
case COMEDI_CANCEL: |
|
rc = do_cancel_ioctl(dev, arg, file); |
|
break; |
|
case COMEDI_CMD: { |
|
struct comedi_cmd cmd; |
|
bool copy = false; |
|
|
|
if (copy_from_user(&cmd, (void __user *)arg, sizeof(cmd))) { |
|
rc = -EFAULT; |
|
break; |
|
} |
|
rc = do_cmd_ioctl(dev, &cmd, ©, file); |
|
if (copy && copy_to_user((void __user *)arg, &cmd, sizeof(cmd))) |
|
rc = -EFAULT; |
|
break; |
|
} |
|
case COMEDI_CMDTEST: { |
|
struct comedi_cmd cmd; |
|
bool copy = false; |
|
|
|
if (copy_from_user(&cmd, (void __user *)arg, sizeof(cmd))) { |
|
rc = -EFAULT; |
|
break; |
|
} |
|
rc = do_cmdtest_ioctl(dev, &cmd, ©, file); |
|
if (copy && copy_to_user((void __user *)arg, &cmd, sizeof(cmd))) |
|
rc = -EFAULT; |
|
break; |
|
} |
|
case COMEDI_INSNLIST: { |
|
struct comedi_insnlist insnlist; |
|
struct comedi_insn *insns = NULL; |
|
|
|
if (copy_from_user(&insnlist, (void __user *)arg, |
|
sizeof(insnlist))) { |
|
rc = -EFAULT; |
|
break; |
|
} |
|
insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL); |
|
if (!insns) { |
|
rc = -ENOMEM; |
|
break; |
|
} |
|
if (copy_from_user(insns, insnlist.insns, |
|
sizeof(*insns) * insnlist.n_insns)) { |
|
rc = -EFAULT; |
|
kfree(insns); |
|
break; |
|
} |
|
rc = do_insnlist_ioctl(dev, insns, insnlist.n_insns, file); |
|
kfree(insns); |
|
break; |
|
} |
|
case COMEDI_INSN: { |
|
struct comedi_insn insn; |
|
|
|
if (copy_from_user(&insn, (void __user *)arg, sizeof(insn))) |
|
rc = -EFAULT; |
|
else |
|
rc = do_insn_ioctl(dev, &insn, file); |
|
break; |
|
} |
|
case COMEDI_POLL: |
|
rc = do_poll_ioctl(dev, arg, file); |
|
break; |
|
case COMEDI_SETRSUBD: |
|
rc = do_setrsubd_ioctl(dev, arg, file); |
|
break; |
|
case COMEDI_SETWSUBD: |
|
rc = do_setwsubd_ioctl(dev, arg, file); |
|
break; |
|
default: |
|
rc = -ENOTTY; |
|
break; |
|
} |
|
|
|
done: |
|
mutex_unlock(&dev->mutex); |
|
return rc; |
|
} |
|
|
|
static void comedi_vm_open(struct vm_area_struct *area) |
|
{ |
|
struct comedi_buf_map *bm; |
|
|
|
bm = area->vm_private_data; |
|
comedi_buf_map_get(bm); |
|
} |
|
|
|
static void comedi_vm_close(struct vm_area_struct *area) |
|
{ |
|
struct comedi_buf_map *bm; |
|
|
|
bm = area->vm_private_data; |
|
comedi_buf_map_put(bm); |
|
} |
|
|
|
static int comedi_vm_access(struct vm_area_struct *vma, unsigned long addr, |
|
void *buf, int len, int write) |
|
{ |
|
struct comedi_buf_map *bm = vma->vm_private_data; |
|
unsigned long offset = |
|
addr - vma->vm_start + (vma->vm_pgoff << PAGE_SHIFT); |
|
|
|
if (len < 0) |
|
return -EINVAL; |
|
if (len > vma->vm_end - addr) |
|
len = vma->vm_end - addr; |
|
return comedi_buf_map_access(bm, offset, buf, len, write); |
|
} |
|
|
|
static const struct vm_operations_struct comedi_vm_ops = { |
|
.open = comedi_vm_open, |
|
.close = comedi_vm_close, |
|
.access = comedi_vm_access, |
|
}; |
|
|
|
static int comedi_mmap(struct file *file, struct vm_area_struct *vma) |
|
{ |
|
struct comedi_file *cfp = file->private_data; |
|
struct comedi_device *dev = cfp->dev; |
|
struct comedi_subdevice *s; |
|
struct comedi_async *async; |
|
struct comedi_buf_map *bm = NULL; |
|
struct comedi_buf_page *buf; |
|
unsigned long start = vma->vm_start; |
|
unsigned long size; |
|
int n_pages; |
|
int i; |
|
int retval = 0; |
|
|
|
/* |
|
* 'trylock' avoids circular dependency with current->mm->mmap_lock |
|
* and down-reading &dev->attach_lock should normally succeed without |
|
* contention unless the device is in the process of being attached |
|
* or detached. |
|
*/ |
|
if (!down_read_trylock(&dev->attach_lock)) |
|
return -EAGAIN; |
|
|
|
if (!dev->attached) { |
|
dev_dbg(dev->class_dev, "no driver attached\n"); |
|
retval = -ENODEV; |
|
goto done; |
|
} |
|
|
|
if (vma->vm_flags & VM_WRITE) |
|
s = comedi_file_write_subdevice(file); |
|
else |
|
s = comedi_file_read_subdevice(file); |
|
if (!s) { |
|
retval = -EINVAL; |
|
goto done; |
|
} |
|
|
|
async = s->async; |
|
if (!async) { |
|
retval = -EINVAL; |
|
goto done; |
|
} |
|
|
|
if (vma->vm_pgoff != 0) { |
|
dev_dbg(dev->class_dev, "mmap() offset must be 0.\n"); |
|
retval = -EINVAL; |
|
goto done; |
|
} |
|
|
|
size = vma->vm_end - vma->vm_start; |
|
if (size > async->prealloc_bufsz) { |
|
retval = -EFAULT; |
|
goto done; |
|
} |
|
if (offset_in_page(size)) { |
|
retval = -EFAULT; |
|
goto done; |
|
} |
|
|
|
n_pages = vma_pages(vma); |
|
|
|
/* get reference to current buf map (if any) */ |
|
bm = comedi_buf_map_from_subdev_get(s); |
|
if (!bm || n_pages > bm->n_pages) { |
|
retval = -EINVAL; |
|
goto done; |
|
} |
|
if (bm->dma_dir != DMA_NONE) { |
|
/* |
|
* DMA buffer was allocated as a single block. |
|
* Address is in page_list[0]. |
|
*/ |
|
buf = &bm->page_list[0]; |
|
retval = dma_mmap_coherent(bm->dma_hw_dev, vma, buf->virt_addr, |
|
buf->dma_addr, n_pages * PAGE_SIZE); |
|
} else { |
|
for (i = 0; i < n_pages; ++i) { |
|
unsigned long pfn; |
|
|
|
buf = &bm->page_list[i]; |
|
pfn = page_to_pfn(virt_to_page(buf->virt_addr)); |
|
retval = remap_pfn_range(vma, start, pfn, PAGE_SIZE, |
|
PAGE_SHARED); |
|
if (retval) |
|
break; |
|
|
|
start += PAGE_SIZE; |
|
} |
|
} |
|
|
|
if (retval == 0) { |
|
vma->vm_ops = &comedi_vm_ops; |
|
vma->vm_private_data = bm; |
|
|
|
vma->vm_ops->open(vma); |
|
} |
|
|
|
done: |
|
up_read(&dev->attach_lock); |
|
comedi_buf_map_put(bm); /* put reference to buf map - okay if NULL */ |
|
return retval; |
|
} |
|
|
|
static __poll_t comedi_poll(struct file *file, poll_table *wait) |
|
{ |
|
__poll_t mask = 0; |
|
struct comedi_file *cfp = file->private_data; |
|
struct comedi_device *dev = cfp->dev; |
|
struct comedi_subdevice *s, *s_read; |
|
|
|
down_read(&dev->attach_lock); |
|
|
|
if (!dev->attached) { |
|
dev_dbg(dev->class_dev, "no driver attached\n"); |
|
goto done; |
|
} |
|
|
|
s = comedi_file_read_subdevice(file); |
|
s_read = s; |
|
if (s && s->async) { |
|
poll_wait(file, &s->async->wait_head, wait); |
|
if (s->busy != file || !comedi_is_subdevice_running(s) || |
|
(s->async->cmd.flags & CMDF_WRITE) || |
|
comedi_buf_read_n_available(s) > 0) |
|
mask |= EPOLLIN | EPOLLRDNORM; |
|
} |
|
|
|
s = comedi_file_write_subdevice(file); |
|
if (s && s->async) { |
|
unsigned int bps = comedi_bytes_per_sample(s); |
|
|
|
if (s != s_read) |
|
poll_wait(file, &s->async->wait_head, wait); |
|
if (s->busy != file || !comedi_is_subdevice_running(s) || |
|
!(s->async->cmd.flags & CMDF_WRITE) || |
|
comedi_buf_write_n_available(s) >= bps) |
|
mask |= EPOLLOUT | EPOLLWRNORM; |
|
} |
|
|
|
done: |
|
up_read(&dev->attach_lock); |
|
return mask; |
|
} |
|
|
|
static ssize_t comedi_write(struct file *file, const char __user *buf, |
|
size_t nbytes, loff_t *offset) |
|
{ |
|
struct comedi_subdevice *s; |
|
struct comedi_async *async; |
|
unsigned int n, m; |
|
ssize_t count = 0; |
|
int retval = 0; |
|
DECLARE_WAITQUEUE(wait, current); |
|
struct comedi_file *cfp = file->private_data; |
|
struct comedi_device *dev = cfp->dev; |
|
bool become_nonbusy = false; |
|
bool attach_locked; |
|
unsigned int old_detach_count; |
|
|
|
/* Protect against device detachment during operation. */ |
|
down_read(&dev->attach_lock); |
|
attach_locked = true; |
|
old_detach_count = dev->detach_count; |
|
|
|
if (!dev->attached) { |
|
dev_dbg(dev->class_dev, "no driver attached\n"); |
|
retval = -ENODEV; |
|
goto out; |
|
} |
|
|
|
s = comedi_file_write_subdevice(file); |
|
if (!s || !s->async) { |
|
retval = -EIO; |
|
goto out; |
|
} |
|
|
|
async = s->async; |
|
if (s->busy != file || !(async->cmd.flags & CMDF_WRITE)) { |
|
retval = -EINVAL; |
|
goto out; |
|
} |
|
|
|
add_wait_queue(&async->wait_head, &wait); |
|
while (count == 0 && !retval) { |
|
unsigned int runflags; |
|
unsigned int wp, n1, n2; |
|
|
|
set_current_state(TASK_INTERRUPTIBLE); |
|
|
|
runflags = comedi_get_subdevice_runflags(s); |
|
if (!comedi_is_runflags_running(runflags)) { |
|
if (comedi_is_runflags_in_error(runflags)) |
|
retval = -EPIPE; |
|
if (retval || nbytes) |
|
become_nonbusy = true; |
|
break; |
|
} |
|
if (nbytes == 0) |
|
break; |
|
|
|
/* Allocate all free buffer space. */ |
|
comedi_buf_write_alloc(s, async->prealloc_bufsz); |
|
m = comedi_buf_write_n_allocated(s); |
|
n = min_t(size_t, m, nbytes); |
|
|
|
if (n == 0) { |
|
if (file->f_flags & O_NONBLOCK) { |
|
retval = -EAGAIN; |
|
break; |
|
} |
|
schedule(); |
|
if (signal_pending(current)) { |
|
retval = -ERESTARTSYS; |
|
break; |
|
} |
|
if (s->busy != file || |
|
!(async->cmd.flags & CMDF_WRITE)) { |
|
retval = -EINVAL; |
|
break; |
|
} |
|
continue; |
|
} |
|
|
|
set_current_state(TASK_RUNNING); |
|
wp = async->buf_write_ptr; |
|
n1 = min(n, async->prealloc_bufsz - wp); |
|
n2 = n - n1; |
|
m = copy_from_user(async->prealloc_buf + wp, buf, n1); |
|
if (m) |
|
m += n2; |
|
else if (n2) |
|
m = copy_from_user(async->prealloc_buf, buf + n1, n2); |
|
if (m) { |
|
n -= m; |
|
retval = -EFAULT; |
|
} |
|
comedi_buf_write_free(s, n); |
|
|
|
count += n; |
|
nbytes -= n; |
|
|
|
buf += n; |
|
} |
|
remove_wait_queue(&async->wait_head, &wait); |
|
set_current_state(TASK_RUNNING); |
|
if (become_nonbusy && count == 0) { |
|
struct comedi_subdevice *new_s; |
|
|
|
/* |
|
* To avoid deadlock, cannot acquire dev->mutex |
|
* while dev->attach_lock is held. |
|
*/ |
|
up_read(&dev->attach_lock); |
|
attach_locked = false; |
|
mutex_lock(&dev->mutex); |
|
/* |
|
* Check device hasn't become detached behind our back. |
|
* Checking dev->detach_count is unchanged ought to be |
|
* sufficient (unless there have been 2**32 detaches in the |
|
* meantime!), but check the subdevice pointer as well just in |
|
* case. |
|
* |
|
* Also check the subdevice is still in a suitable state to |
|
* become non-busy in case it changed behind our back. |
|
*/ |
|
new_s = comedi_file_write_subdevice(file); |
|
if (dev->attached && old_detach_count == dev->detach_count && |
|
s == new_s && new_s->async == async && s->busy == file && |
|
(async->cmd.flags & CMDF_WRITE) && |
|
!comedi_is_subdevice_running(s)) |
|
do_become_nonbusy(dev, s); |
|
mutex_unlock(&dev->mutex); |
|
} |
|
out: |
|
if (attach_locked) |
|
up_read(&dev->attach_lock); |
|
|
|
return count ? count : retval; |
|
} |
|
|
|
static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes, |
|
loff_t *offset) |
|
{ |
|
struct comedi_subdevice *s; |
|
struct comedi_async *async; |
|
unsigned int n, m; |
|
ssize_t count = 0; |
|
int retval = 0; |
|
DECLARE_WAITQUEUE(wait, current); |
|
struct comedi_file *cfp = file->private_data; |
|
struct comedi_device *dev = cfp->dev; |
|
unsigned int old_detach_count; |
|
bool become_nonbusy = false; |
|
bool attach_locked; |
|
|
|
/* Protect against device detachment during operation. */ |
|
down_read(&dev->attach_lock); |
|
attach_locked = true; |
|
old_detach_count = dev->detach_count; |
|
|
|
if (!dev->attached) { |
|
dev_dbg(dev->class_dev, "no driver attached\n"); |
|
retval = -ENODEV; |
|
goto out; |
|
} |
|
|
|
s = comedi_file_read_subdevice(file); |
|
if (!s || !s->async) { |
|
retval = -EIO; |
|
goto out; |
|
} |
|
|
|
async = s->async; |
|
if (s->busy != file || (async->cmd.flags & CMDF_WRITE)) { |
|
retval = -EINVAL; |
|
goto out; |
|
} |
|
|
|
add_wait_queue(&async->wait_head, &wait); |
|
while (count == 0 && !retval) { |
|
unsigned int rp, n1, n2; |
|
|
|
set_current_state(TASK_INTERRUPTIBLE); |
|
|
|
m = comedi_buf_read_n_available(s); |
|
n = min_t(size_t, m, nbytes); |
|
|
|
if (n == 0) { |
|
unsigned int runflags = |
|
comedi_get_subdevice_runflags(s); |
|
|
|
if (!comedi_is_runflags_running(runflags)) { |
|
if (comedi_is_runflags_in_error(runflags)) |
|
retval = -EPIPE; |
|
if (retval || nbytes) |
|
become_nonbusy = true; |
|
break; |
|
} |
|
if (nbytes == 0) |
|
break; |
|
if (file->f_flags & O_NONBLOCK) { |
|
retval = -EAGAIN; |
|
break; |
|
} |
|
schedule(); |
|
if (signal_pending(current)) { |
|
retval = -ERESTARTSYS; |
|
break; |
|
} |
|
if (s->busy != file || |
|
(async->cmd.flags & CMDF_WRITE)) { |
|
retval = -EINVAL; |
|
break; |
|
} |
|
continue; |
|
} |
|
|
|
set_current_state(TASK_RUNNING); |
|
rp = async->buf_read_ptr; |
|
n1 = min(n, async->prealloc_bufsz - rp); |
|
n2 = n - n1; |
|
m = copy_to_user(buf, async->prealloc_buf + rp, n1); |
|
if (m) |
|
m += n2; |
|
else if (n2) |
|
m = copy_to_user(buf + n1, async->prealloc_buf, n2); |
|
if (m) { |
|
n -= m; |
|
retval = -EFAULT; |
|
} |
|
|
|
comedi_buf_read_alloc(s, n); |
|
comedi_buf_read_free(s, n); |
|
|
|
count += n; |
|
nbytes -= n; |
|
|
|
buf += n; |
|
} |
|
remove_wait_queue(&async->wait_head, &wait); |
|
set_current_state(TASK_RUNNING); |
|
if (become_nonbusy && count == 0) { |
|
struct comedi_subdevice *new_s; |
|
|
|
/* |
|
* To avoid deadlock, cannot acquire dev->mutex |
|
* while dev->attach_lock is held. |
|
*/ |
|
up_read(&dev->attach_lock); |
|
attach_locked = false; |
|
mutex_lock(&dev->mutex); |
|
/* |
|
* Check device hasn't become detached behind our back. |
|
* Checking dev->detach_count is unchanged ought to be |
|
* sufficient (unless there have been 2**32 detaches in the |
|
* meantime!), but check the subdevice pointer as well just in |
|
* case. |
|
* |
|
* Also check the subdevice is still in a suitable state to |
|
* become non-busy in case it changed behind our back. |
|
*/ |
|
new_s = comedi_file_read_subdevice(file); |
|
if (dev->attached && old_detach_count == dev->detach_count && |
|
s == new_s && new_s->async == async && s->busy == file && |
|
!(async->cmd.flags & CMDF_WRITE) && |
|
!comedi_is_subdevice_running(s) && |
|
comedi_buf_read_n_available(s) == 0) |
|
do_become_nonbusy(dev, s); |
|
mutex_unlock(&dev->mutex); |
|
} |
|
out: |
|
if (attach_locked) |
|
up_read(&dev->attach_lock); |
|
|
|
return count ? count : retval; |
|
} |
|
|
|
static int comedi_open(struct inode *inode, struct file *file) |
|
{ |
|
const unsigned int minor = iminor(inode); |
|
struct comedi_file *cfp; |
|
struct comedi_device *dev = comedi_dev_get_from_minor(minor); |
|
int rc; |
|
|
|
if (!dev) { |
|
pr_debug("invalid minor number\n"); |
|
return -ENODEV; |
|
} |
|
|
|
cfp = kzalloc(sizeof(*cfp), GFP_KERNEL); |
|
if (!cfp) { |
|
comedi_dev_put(dev); |
|
return -ENOMEM; |
|
} |
|
|
|
cfp->dev = dev; |
|
|
|
mutex_lock(&dev->mutex); |
|
if (!dev->attached && !capable(CAP_SYS_ADMIN)) { |
|
dev_dbg(dev->class_dev, "not attached and not CAP_SYS_ADMIN\n"); |
|
rc = -ENODEV; |
|
goto out; |
|
} |
|
if (dev->attached && dev->use_count == 0) { |
|
if (!try_module_get(dev->driver->module)) { |
|
rc = -ENXIO; |
|
goto out; |
|
} |
|
if (dev->open) { |
|
rc = dev->open(dev); |
|
if (rc < 0) { |
|
module_put(dev->driver->module); |
|
goto out; |
|
} |
|
} |
|
} |
|
|
|
dev->use_count++; |
|
file->private_data = cfp; |
|
comedi_file_reset(file); |
|
rc = 0; |
|
|
|
out: |
|
mutex_unlock(&dev->mutex); |
|
if (rc) { |
|
comedi_dev_put(dev); |
|
kfree(cfp); |
|
} |
|
return rc; |
|
} |
|
|
|
static int comedi_fasync(int fd, struct file *file, int on) |
|
{ |
|
struct comedi_file *cfp = file->private_data; |
|
struct comedi_device *dev = cfp->dev; |
|
|
|
return fasync_helper(fd, file, on, &dev->async_queue); |
|
} |
|
|
|
static int comedi_close(struct inode *inode, struct file *file) |
|
{ |
|
struct comedi_file *cfp = file->private_data; |
|
struct comedi_device *dev = cfp->dev; |
|
struct comedi_subdevice *s = NULL; |
|
int i; |
|
|
|
mutex_lock(&dev->mutex); |
|
|
|
if (dev->subdevices) { |
|
for (i = 0; i < dev->n_subdevices; i++) { |
|
s = &dev->subdevices[i]; |
|
|
|
if (s->busy == file) |
|
do_cancel(dev, s); |
|
if (s->lock == file) |
|
s->lock = NULL; |
|
} |
|
} |
|
if (dev->attached && dev->use_count == 1) { |
|
if (dev->close) |
|
dev->close(dev); |
|
module_put(dev->driver->module); |
|
} |
|
|
|
dev->use_count--; |
|
|
|
mutex_unlock(&dev->mutex); |
|
comedi_dev_put(dev); |
|
kfree(cfp); |
|
|
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_COMPAT |
|
|
|
#define COMEDI32_CHANINFO _IOR(CIO, 3, struct comedi32_chaninfo_struct) |
|
#define COMEDI32_RANGEINFO _IOR(CIO, 8, struct comedi32_rangeinfo_struct) |
|
/* |
|
* N.B. COMEDI32_CMD and COMEDI_CMD ought to use _IOWR, not _IOR. |
|
* It's too late to change it now, but it only affects the command number. |
|
*/ |
|
#define COMEDI32_CMD _IOR(CIO, 9, struct comedi32_cmd_struct) |
|
/* |
|
* N.B. COMEDI32_CMDTEST and COMEDI_CMDTEST ought to use _IOWR, not _IOR. |
|
* It's too late to change it now, but it only affects the command number. |
|
*/ |
|
#define COMEDI32_CMDTEST _IOR(CIO, 10, struct comedi32_cmd_struct) |
|
#define COMEDI32_INSNLIST _IOR(CIO, 11, struct comedi32_insnlist_struct) |
|
#define COMEDI32_INSN _IOR(CIO, 12, struct comedi32_insn_struct) |
|
|
|
struct comedi32_chaninfo_struct { |
|
unsigned int subdev; |
|
compat_uptr_t maxdata_list; /* 32-bit 'unsigned int *' */ |
|
compat_uptr_t flaglist; /* 32-bit 'unsigned int *' */ |
|
compat_uptr_t rangelist; /* 32-bit 'unsigned int *' */ |
|
unsigned int unused[4]; |
|
}; |
|
|
|
struct comedi32_rangeinfo_struct { |
|
unsigned int range_type; |
|
compat_uptr_t range_ptr; /* 32-bit 'void *' */ |
|
}; |
|
|
|
struct comedi32_cmd_struct { |
|
unsigned int subdev; |
|
unsigned int flags; |
|
unsigned int start_src; |
|
unsigned int start_arg; |
|
unsigned int scan_begin_src; |
|
unsigned int scan_begin_arg; |
|
unsigned int convert_src; |
|
unsigned int convert_arg; |
|
unsigned int scan_end_src; |
|
unsigned int scan_end_arg; |
|
unsigned int stop_src; |
|
unsigned int stop_arg; |
|
compat_uptr_t chanlist; /* 32-bit 'unsigned int *' */ |
|
unsigned int chanlist_len; |
|
compat_uptr_t data; /* 32-bit 'short *' */ |
|
unsigned int data_len; |
|
}; |
|
|
|
struct comedi32_insn_struct { |
|
unsigned int insn; |
|
unsigned int n; |
|
compat_uptr_t data; /* 32-bit 'unsigned int *' */ |
|
unsigned int subdev; |
|
unsigned int chanspec; |
|
unsigned int unused[3]; |
|
}; |
|
|
|
struct comedi32_insnlist_struct { |
|
unsigned int n_insns; |
|
compat_uptr_t insns; /* 32-bit 'struct comedi_insn *' */ |
|
}; |
|
|
|
/* Handle 32-bit COMEDI_CHANINFO ioctl. */ |
|
static int compat_chaninfo(struct file *file, unsigned long arg) |
|
{ |
|
struct comedi_file *cfp = file->private_data; |
|
struct comedi_device *dev = cfp->dev; |
|
struct comedi32_chaninfo_struct chaninfo32; |
|
struct comedi_chaninfo chaninfo; |
|
int err; |
|
|
|
if (copy_from_user(&chaninfo32, compat_ptr(arg), sizeof(chaninfo32))) |
|
return -EFAULT; |
|
|
|
memset(&chaninfo, 0, sizeof(chaninfo)); |
|
chaninfo.subdev = chaninfo32.subdev; |
|
chaninfo.maxdata_list = compat_ptr(chaninfo32.maxdata_list); |
|
chaninfo.flaglist = compat_ptr(chaninfo32.flaglist); |
|
chaninfo.rangelist = compat_ptr(chaninfo32.rangelist); |
|
|
|
mutex_lock(&dev->mutex); |
|
err = do_chaninfo_ioctl(dev, &chaninfo); |
|
mutex_unlock(&dev->mutex); |
|
return err; |
|
} |
|
|
|
/* Handle 32-bit COMEDI_RANGEINFO ioctl. */ |
|
static int compat_rangeinfo(struct file *file, unsigned long arg) |
|
{ |
|
struct comedi_file *cfp = file->private_data; |
|
struct comedi_device *dev = cfp->dev; |
|
struct comedi32_rangeinfo_struct rangeinfo32; |
|
struct comedi_rangeinfo rangeinfo; |
|
int err; |
|
|
|
if (copy_from_user(&rangeinfo32, compat_ptr(arg), sizeof(rangeinfo32))) |
|
return -EFAULT; |
|
memset(&rangeinfo, 0, sizeof(rangeinfo)); |
|
rangeinfo.range_type = rangeinfo32.range_type; |
|
rangeinfo.range_ptr = compat_ptr(rangeinfo32.range_ptr); |
|
|
|
mutex_lock(&dev->mutex); |
|
err = do_rangeinfo_ioctl(dev, &rangeinfo); |
|
mutex_unlock(&dev->mutex); |
|
return err; |
|
} |
|
|
|
/* Copy 32-bit cmd structure to native cmd structure. */ |
|
static int get_compat_cmd(struct comedi_cmd *cmd, |
|
struct comedi32_cmd_struct __user *cmd32) |
|
{ |
|
struct comedi32_cmd_struct v32; |
|
|
|
if (copy_from_user(&v32, cmd32, sizeof(v32))) |
|
return -EFAULT; |
|
|
|
cmd->subdev = v32.subdev; |
|
cmd->flags = v32.flags; |
|
cmd->start_src = v32.start_src; |
|
cmd->start_arg = v32.start_arg; |
|
cmd->scan_begin_src = v32.scan_begin_src; |
|
cmd->scan_begin_arg = v32.scan_begin_arg; |
|
cmd->convert_src = v32.convert_src; |
|
cmd->convert_arg = v32.convert_arg; |
|
cmd->scan_end_src = v32.scan_end_src; |
|
cmd->scan_end_arg = v32.scan_end_arg; |
|
cmd->stop_src = v32.stop_src; |
|
cmd->stop_arg = v32.stop_arg; |
|
cmd->chanlist = (unsigned int __force *)compat_ptr(v32.chanlist); |
|
cmd->chanlist_len = v32.chanlist_len; |
|
cmd->data = compat_ptr(v32.data); |
|
cmd->data_len = v32.data_len; |
|
return 0; |
|
} |
|
|
|
/* Copy native cmd structure to 32-bit cmd structure. */ |
|
static int put_compat_cmd(struct comedi32_cmd_struct __user *cmd32, |
|
struct comedi_cmd *cmd) |
|
{ |
|
struct comedi32_cmd_struct v32; |
|
|
|
memset(&v32, 0, sizeof(v32)); |
|
v32.subdev = cmd->subdev; |
|
v32.flags = cmd->flags; |
|
v32.start_src = cmd->start_src; |
|
v32.start_arg = cmd->start_arg; |
|
v32.scan_begin_src = cmd->scan_begin_src; |
|
v32.scan_begin_arg = cmd->scan_begin_arg; |
|
v32.convert_src = cmd->convert_src; |
|
v32.convert_arg = cmd->convert_arg; |
|
v32.scan_end_src = cmd->scan_end_src; |
|
v32.scan_end_arg = cmd->scan_end_arg; |
|
v32.stop_src = cmd->stop_src; |
|
v32.stop_arg = cmd->stop_arg; |
|
/* Assume chanlist pointer is unchanged. */ |
|
v32.chanlist = ptr_to_compat((unsigned int __user *)cmd->chanlist); |
|
v32.chanlist_len = cmd->chanlist_len; |
|
v32.data = ptr_to_compat(cmd->data); |
|
v32.data_len = cmd->data_len; |
|
if (copy_to_user(cmd32, &v32, sizeof(v32))) |
|
return -EFAULT; |
|
return 0; |
|
} |
|
|
|
/* Handle 32-bit COMEDI_CMD ioctl. */ |
|
static int compat_cmd(struct file *file, unsigned long arg) |
|
{ |
|
struct comedi_file *cfp = file->private_data; |
|
struct comedi_device *dev = cfp->dev; |
|
struct comedi_cmd cmd; |
|
bool copy = false; |
|
int rc, err; |
|
|
|
rc = get_compat_cmd(&cmd, compat_ptr(arg)); |
|
if (rc) |
|
return rc; |
|
|
|
mutex_lock(&dev->mutex); |
|
rc = do_cmd_ioctl(dev, &cmd, ©, file); |
|
mutex_unlock(&dev->mutex); |
|
if (copy) { |
|
/* Special case: copy cmd back to user. */ |
|
err = put_compat_cmd(compat_ptr(arg), &cmd); |
|
if (err) |
|
rc = err; |
|
} |
|
return rc; |
|
} |
|
|
|
/* Handle 32-bit COMEDI_CMDTEST ioctl. */ |
|
static int compat_cmdtest(struct file *file, unsigned long arg) |
|
{ |
|
struct comedi_file *cfp = file->private_data; |
|
struct comedi_device *dev = cfp->dev; |
|
struct comedi_cmd cmd; |
|
bool copy = false; |
|
int rc, err; |
|
|
|
rc = get_compat_cmd(&cmd, compat_ptr(arg)); |
|
if (rc) |
|
return rc; |
|
|
|
mutex_lock(&dev->mutex); |
|
rc = do_cmdtest_ioctl(dev, &cmd, ©, file); |
|
mutex_unlock(&dev->mutex); |
|
if (copy) { |
|
err = put_compat_cmd(compat_ptr(arg), &cmd); |
|
if (err) |
|
rc = err; |
|
} |
|
return rc; |
|
} |
|
|
|
/* Copy 32-bit insn structure to native insn structure. */ |
|
static int get_compat_insn(struct comedi_insn *insn, |
|
struct comedi32_insn_struct __user *insn32) |
|
{ |
|
struct comedi32_insn_struct v32; |
|
|
|
/* Copy insn structure. Ignore the unused members. */ |
|
if (copy_from_user(&v32, insn32, sizeof(v32))) |
|
return -EFAULT; |
|
memset(insn, 0, sizeof(*insn)); |
|
insn->insn = v32.insn; |
|
insn->n = v32.n; |
|
insn->data = compat_ptr(v32.data); |
|
insn->subdev = v32.subdev; |
|
insn->chanspec = v32.chanspec; |
|
return 0; |
|
} |
|
|
|
/* Handle 32-bit COMEDI_INSNLIST ioctl. */ |
|
static int compat_insnlist(struct file *file, unsigned long arg) |
|
{ |
|
struct comedi_file *cfp = file->private_data; |
|
struct comedi_device *dev = cfp->dev; |
|
struct comedi32_insnlist_struct insnlist32; |
|
struct comedi32_insn_struct __user *insn32; |
|
struct comedi_insn *insns; |
|
unsigned int n; |
|
int rc; |
|
|
|
if (copy_from_user(&insnlist32, compat_ptr(arg), sizeof(insnlist32))) |
|
return -EFAULT; |
|
|
|
insns = kcalloc(insnlist32.n_insns, sizeof(*insns), GFP_KERNEL); |
|
if (!insns) |
|
return -ENOMEM; |
|
|
|
/* Copy insn structures. */ |
|
insn32 = compat_ptr(insnlist32.insns); |
|
for (n = 0; n < insnlist32.n_insns; n++) { |
|
rc = get_compat_insn(insns + n, insn32 + n); |
|
if (rc) { |
|
kfree(insns); |
|
return rc; |
|
} |
|
} |
|
|
|
mutex_lock(&dev->mutex); |
|
rc = do_insnlist_ioctl(dev, insns, insnlist32.n_insns, file); |
|
mutex_unlock(&dev->mutex); |
|
kfree(insns); |
|
return rc; |
|
} |
|
|
|
/* Handle 32-bit COMEDI_INSN ioctl. */ |
|
static int compat_insn(struct file *file, unsigned long arg) |
|
{ |
|
struct comedi_file *cfp = file->private_data; |
|
struct comedi_device *dev = cfp->dev; |
|
struct comedi_insn insn; |
|
int rc; |
|
|
|
rc = get_compat_insn(&insn, (void __user *)arg); |
|
if (rc) |
|
return rc; |
|
|
|
mutex_lock(&dev->mutex); |
|
rc = do_insn_ioctl(dev, &insn, file); |
|
mutex_unlock(&dev->mutex); |
|
return rc; |
|
} |
|
|
|
/* |
|
* compat_ioctl file operation. |
|
* |
|
* Returns -ENOIOCTLCMD for unrecognised ioctl codes. |
|
*/ |
|
static long comedi_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
|
{ |
|
int rc; |
|
|
|
switch (cmd) { |
|
case COMEDI_DEVCONFIG: |
|
case COMEDI_DEVINFO: |
|
case COMEDI_SUBDINFO: |
|
case COMEDI_BUFCONFIG: |
|
case COMEDI_BUFINFO: |
|
/* Just need to translate the pointer argument. */ |
|
arg = (unsigned long)compat_ptr(arg); |
|
rc = comedi_unlocked_ioctl(file, cmd, arg); |
|
break; |
|
case COMEDI_LOCK: |
|
case COMEDI_UNLOCK: |
|
case COMEDI_CANCEL: |
|
case COMEDI_POLL: |
|
case COMEDI_SETRSUBD: |
|
case COMEDI_SETWSUBD: |
|
/* No translation needed. */ |
|
rc = comedi_unlocked_ioctl(file, cmd, arg); |
|
break; |
|
case COMEDI32_CHANINFO: |
|
rc = compat_chaninfo(file, arg); |
|
break; |
|
case COMEDI32_RANGEINFO: |
|
rc = compat_rangeinfo(file, arg); |
|
break; |
|
case COMEDI32_CMD: |
|
rc = compat_cmd(file, arg); |
|
break; |
|
case COMEDI32_CMDTEST: |
|
rc = compat_cmdtest(file, arg); |
|
break; |
|
case COMEDI32_INSNLIST: |
|
rc = compat_insnlist(file, arg); |
|
break; |
|
case COMEDI32_INSN: |
|
rc = compat_insn(file, arg); |
|
break; |
|
default: |
|
rc = -ENOIOCTLCMD; |
|
break; |
|
} |
|
return rc; |
|
} |
|
#else |
|
#define comedi_compat_ioctl NULL |
|
#endif |
|
|
|
static const struct file_operations comedi_fops = { |
|
.owner = THIS_MODULE, |
|
.unlocked_ioctl = comedi_unlocked_ioctl, |
|
.compat_ioctl = comedi_compat_ioctl, |
|
.open = comedi_open, |
|
.release = comedi_close, |
|
.read = comedi_read, |
|
.write = comedi_write, |
|
.mmap = comedi_mmap, |
|
.poll = comedi_poll, |
|
.fasync = comedi_fasync, |
|
.llseek = noop_llseek, |
|
}; |
|
|
|
/** |
|
* comedi_event() - Handle events for asynchronous COMEDI command |
|
* @dev: COMEDI device. |
|
* @s: COMEDI subdevice. |
|
* Context: in_interrupt() (usually), @s->spin_lock spin-lock not held. |
|
* |
|
* If an asynchronous COMEDI command is active on the subdevice, process |
|
* any %COMEDI_CB_... event flags that have been set, usually by an |
|
* interrupt handler. These may change the run state of the asynchronous |
|
* command, wake a task, and/or send a %SIGIO signal. |
|
*/ |
|
void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s) |
|
{ |
|
struct comedi_async *async = s->async; |
|
unsigned int events; |
|
int si_code = 0; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&s->spin_lock, flags); |
|
|
|
events = async->events; |
|
async->events = 0; |
|
if (!__comedi_is_subdevice_running(s)) { |
|
spin_unlock_irqrestore(&s->spin_lock, flags); |
|
return; |
|
} |
|
|
|
if (events & COMEDI_CB_CANCEL_MASK) |
|
__comedi_clear_subdevice_runflags(s, COMEDI_SRF_RUNNING); |
|
|
|
/* |
|
* Remember if an error event has occurred, so an error can be |
|
* returned the next time the user does a read() or write(). |
|
*/ |
|
if (events & COMEDI_CB_ERROR_MASK) |
|
__comedi_set_subdevice_runflags(s, COMEDI_SRF_ERROR); |
|
|
|
if (async->cb_mask & events) { |
|
wake_up_interruptible(&async->wait_head); |
|
si_code = async->cmd.flags & CMDF_WRITE ? POLL_OUT : POLL_IN; |
|
} |
|
|
|
spin_unlock_irqrestore(&s->spin_lock, flags); |
|
|
|
if (si_code) |
|
kill_fasync(&dev->async_queue, SIGIO, si_code); |
|
} |
|
EXPORT_SYMBOL_GPL(comedi_event); |
|
|
|
/* Note: the ->mutex is pre-locked on successful return */ |
|
struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device) |
|
{ |
|
struct comedi_device *dev; |
|
struct device *csdev; |
|
unsigned int i; |
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
|
if (!dev) |
|
return ERR_PTR(-ENOMEM); |
|
comedi_device_init(dev); |
|
comedi_set_hw_dev(dev, hardware_device); |
|
mutex_lock(&dev->mutex); |
|
mutex_lock(&comedi_board_minor_table_lock); |
|
for (i = hardware_device ? comedi_num_legacy_minors : 0; |
|
i < COMEDI_NUM_BOARD_MINORS; ++i) { |
|
if (!comedi_board_minor_table[i]) { |
|
comedi_board_minor_table[i] = dev; |
|
break; |
|
} |
|
} |
|
mutex_unlock(&comedi_board_minor_table_lock); |
|
if (i == COMEDI_NUM_BOARD_MINORS) { |
|
mutex_unlock(&dev->mutex); |
|
comedi_device_cleanup(dev); |
|
comedi_dev_put(dev); |
|
dev_err(hardware_device, |
|
"ran out of minor numbers for board device files\n"); |
|
return ERR_PTR(-EBUSY); |
|
} |
|
dev->minor = i; |
|
csdev = device_create(comedi_class, hardware_device, |
|
MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i); |
|
if (!IS_ERR(csdev)) |
|
dev->class_dev = get_device(csdev); |
|
|
|
/* Note: dev->mutex needs to be unlocked by the caller. */ |
|
return dev; |
|
} |
|
|
|
void comedi_release_hardware_device(struct device *hardware_device) |
|
{ |
|
int minor; |
|
struct comedi_device *dev; |
|
|
|
for (minor = comedi_num_legacy_minors; minor < COMEDI_NUM_BOARD_MINORS; |
|
minor++) { |
|
mutex_lock(&comedi_board_minor_table_lock); |
|
dev = comedi_board_minor_table[minor]; |
|
if (dev && dev->hw_dev == hardware_device) { |
|
comedi_board_minor_table[minor] = NULL; |
|
mutex_unlock(&comedi_board_minor_table_lock); |
|
comedi_free_board_dev(dev); |
|
break; |
|
} |
|
mutex_unlock(&comedi_board_minor_table_lock); |
|
} |
|
} |
|
|
|
int comedi_alloc_subdevice_minor(struct comedi_subdevice *s) |
|
{ |
|
struct comedi_device *dev = s->device; |
|
struct device *csdev; |
|
unsigned int i; |
|
|
|
mutex_lock(&comedi_subdevice_minor_table_lock); |
|
for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) { |
|
if (!comedi_subdevice_minor_table[i]) { |
|
comedi_subdevice_minor_table[i] = s; |
|
break; |
|
} |
|
} |
|
mutex_unlock(&comedi_subdevice_minor_table_lock); |
|
if (i == COMEDI_NUM_SUBDEVICE_MINORS) { |
|
dev_err(dev->class_dev, |
|
"ran out of minor numbers for subdevice files\n"); |
|
return -EBUSY; |
|
} |
|
i += COMEDI_NUM_BOARD_MINORS; |
|
s->minor = i; |
|
csdev = device_create(comedi_class, dev->class_dev, |
|
MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i", |
|
dev->minor, s->index); |
|
if (!IS_ERR(csdev)) |
|
s->class_dev = csdev; |
|
|
|
return 0; |
|
} |
|
|
|
void comedi_free_subdevice_minor(struct comedi_subdevice *s) |
|
{ |
|
unsigned int i; |
|
|
|
if (!s) |
|
return; |
|
if (s->minor < COMEDI_NUM_BOARD_MINORS || |
|
s->minor >= COMEDI_NUM_MINORS) |
|
return; |
|
|
|
i = s->minor - COMEDI_NUM_BOARD_MINORS; |
|
mutex_lock(&comedi_subdevice_minor_table_lock); |
|
if (s == comedi_subdevice_minor_table[i]) |
|
comedi_subdevice_minor_table[i] = NULL; |
|
mutex_unlock(&comedi_subdevice_minor_table_lock); |
|
if (s->class_dev) { |
|
device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); |
|
s->class_dev = NULL; |
|
} |
|
} |
|
|
|
static void comedi_cleanup_board_minors(void) |
|
{ |
|
struct comedi_device *dev; |
|
unsigned int i; |
|
|
|
for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) { |
|
dev = comedi_clear_board_minor(i); |
|
comedi_free_board_dev(dev); |
|
} |
|
} |
|
|
|
static int __init comedi_init(void) |
|
{ |
|
int i; |
|
int retval; |
|
|
|
pr_info("version " COMEDI_RELEASE " - http://www.comedi.org\n"); |
|
|
|
if (comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { |
|
pr_err("invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n", |
|
COMEDI_NUM_BOARD_MINORS); |
|
return -EINVAL; |
|
} |
|
|
|
retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0), |
|
COMEDI_NUM_MINORS, "comedi"); |
|
if (retval) |
|
return retval; |
|
|
|
cdev_init(&comedi_cdev, &comedi_fops); |
|
comedi_cdev.owner = THIS_MODULE; |
|
|
|
retval = kobject_set_name(&comedi_cdev.kobj, "comedi"); |
|
if (retval) |
|
goto out_unregister_chrdev_region; |
|
|
|
retval = cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), |
|
COMEDI_NUM_MINORS); |
|
if (retval) |
|
goto out_unregister_chrdev_region; |
|
|
|
comedi_class = class_create(THIS_MODULE, "comedi"); |
|
if (IS_ERR(comedi_class)) { |
|
retval = PTR_ERR(comedi_class); |
|
pr_err("failed to create class\n"); |
|
goto out_cdev_del; |
|
} |
|
|
|
comedi_class->dev_groups = comedi_dev_groups; |
|
|
|
/* create devices files for legacy/manual use */ |
|
for (i = 0; i < comedi_num_legacy_minors; i++) { |
|
struct comedi_device *dev; |
|
|
|
dev = comedi_alloc_board_minor(NULL); |
|
if (IS_ERR(dev)) { |
|
retval = PTR_ERR(dev); |
|
goto out_cleanup_board_minors; |
|
} |
|
/* comedi_alloc_board_minor() locked the mutex */ |
|
lockdep_assert_held(&dev->mutex); |
|
mutex_unlock(&dev->mutex); |
|
} |
|
|
|
/* XXX requires /proc interface */ |
|
comedi_proc_init(); |
|
|
|
return 0; |
|
|
|
out_cleanup_board_minors: |
|
comedi_cleanup_board_minors(); |
|
class_destroy(comedi_class); |
|
out_cdev_del: |
|
cdev_del(&comedi_cdev); |
|
out_unregister_chrdev_region: |
|
unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); |
|
return retval; |
|
} |
|
module_init(comedi_init); |
|
|
|
static void __exit comedi_cleanup(void) |
|
{ |
|
comedi_cleanup_board_minors(); |
|
class_destroy(comedi_class); |
|
cdev_del(&comedi_cdev); |
|
unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); |
|
|
|
comedi_proc_cleanup(); |
|
} |
|
module_exit(comedi_cleanup); |
|
|
|
MODULE_AUTHOR("https://www.comedi.org"); |
|
MODULE_DESCRIPTION("Comedi core module"); |
|
MODULE_LICENSE("GPL");
|
|
|