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930 lines
26 KiB
930 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Native support for the I/O-Warrior USB devices |
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* |
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* Copyright (c) 2003-2005, 2020 Code Mercenaries GmbH |
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* written by Christian Lucht <[email protected]> and |
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* Christoph Jung <[email protected]> |
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* |
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* based on |
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|
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* usb-skeleton.c by Greg Kroah-Hartman <[email protected]> |
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* brlvger.c by Stephane Dalton <[email protected]> |
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* and Stephane Doyon <[email protected]> |
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* |
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* Released under the GPLv2. |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/usb.h> |
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#include <linux/slab.h> |
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#include <linux/sched.h> |
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#include <linux/mutex.h> |
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#include <linux/poll.h> |
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#include <linux/usb/iowarrior.h> |
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|
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#define DRIVER_AUTHOR "Christian Lucht <[email protected]>" |
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#define DRIVER_DESC "USB IO-Warrior driver" |
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|
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#define USB_VENDOR_ID_CODEMERCS 1984 |
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/* low speed iowarrior */ |
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#define USB_DEVICE_ID_CODEMERCS_IOW40 0x1500 |
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#define USB_DEVICE_ID_CODEMERCS_IOW24 0x1501 |
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#define USB_DEVICE_ID_CODEMERCS_IOWPV1 0x1511 |
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#define USB_DEVICE_ID_CODEMERCS_IOWPV2 0x1512 |
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/* full speed iowarrior */ |
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#define USB_DEVICE_ID_CODEMERCS_IOW56 0x1503 |
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/* fuller speed iowarrior */ |
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#define USB_DEVICE_ID_CODEMERCS_IOW28 0x1504 |
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#define USB_DEVICE_ID_CODEMERCS_IOW28L 0x1505 |
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#define USB_DEVICE_ID_CODEMERCS_IOW100 0x1506 |
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|
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/* OEMed devices */ |
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#define USB_DEVICE_ID_CODEMERCS_IOW24SAG 0x158a |
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#define USB_DEVICE_ID_CODEMERCS_IOW56AM 0x158b |
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|
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/* Get a minor range for your devices from the usb maintainer */ |
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#ifdef CONFIG_USB_DYNAMIC_MINORS |
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#define IOWARRIOR_MINOR_BASE 0 |
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#else |
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#define IOWARRIOR_MINOR_BASE 208 // SKELETON_MINOR_BASE 192 + 16, not official yet |
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#endif |
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|
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/* interrupt input queue size */ |
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#define MAX_INTERRUPT_BUFFER 16 |
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/* |
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maximum number of urbs that are submitted for writes at the same time, |
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this applies to the IOWarrior56 only! |
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IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls. |
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*/ |
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#define MAX_WRITES_IN_FLIGHT 4 |
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MODULE_AUTHOR(DRIVER_AUTHOR); |
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MODULE_DESCRIPTION(DRIVER_DESC); |
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MODULE_LICENSE("GPL"); |
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static struct usb_driver iowarrior_driver; |
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|
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/*--------------*/ |
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/* data */ |
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/*--------------*/ |
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|
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/* Structure to hold all of our device specific stuff */ |
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struct iowarrior { |
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struct mutex mutex; /* locks this structure */ |
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struct usb_device *udev; /* save off the usb device pointer */ |
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struct usb_interface *interface; /* the interface for this device */ |
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unsigned char minor; /* the starting minor number for this device */ |
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struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */ |
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struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */ |
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struct urb *int_in_urb; /* the urb for reading data */ |
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unsigned char *int_in_buffer; /* buffer for data to be read */ |
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unsigned char serial_number; /* to detect lost packages */ |
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unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */ |
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wait_queue_head_t read_wait; |
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wait_queue_head_t write_wait; /* wait-queue for writing to the device */ |
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atomic_t write_busy; /* number of write-urbs submitted */ |
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atomic_t read_idx; |
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atomic_t intr_idx; |
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atomic_t overflow_flag; /* signals an index 'rollover' */ |
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int present; /* this is 1 as long as the device is connected */ |
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int opened; /* this is 1 if the device is currently open */ |
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char chip_serial[9]; /* the serial number string of the chip connected */ |
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int report_size; /* number of bytes in a report */ |
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u16 product_id; |
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struct usb_anchor submitted; |
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}; |
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|
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/*--------------*/ |
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/* globals */ |
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/*--------------*/ |
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|
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/* |
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* USB spec identifies 5 second timeouts. |
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*/ |
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#define GET_TIMEOUT 5 |
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#define USB_REQ_GET_REPORT 0x01 |
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//#if 0 |
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static int usb_get_report(struct usb_device *dev, |
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struct usb_host_interface *inter, unsigned char type, |
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unsigned char id, void *buf, int size) |
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{ |
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return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), |
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USB_REQ_GET_REPORT, |
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USB_DIR_IN | USB_TYPE_CLASS | |
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USB_RECIP_INTERFACE, (type << 8) + id, |
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inter->desc.bInterfaceNumber, buf, size, |
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GET_TIMEOUT*HZ); |
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} |
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//#endif |
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#define USB_REQ_SET_REPORT 0x09 |
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static int usb_set_report(struct usb_interface *intf, unsigned char type, |
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unsigned char id, void *buf, int size) |
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{ |
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return usb_control_msg(interface_to_usbdev(intf), |
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usb_sndctrlpipe(interface_to_usbdev(intf), 0), |
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USB_REQ_SET_REPORT, |
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USB_TYPE_CLASS | USB_RECIP_INTERFACE, |
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(type << 8) + id, |
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intf->cur_altsetting->desc.bInterfaceNumber, buf, |
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size, HZ); |
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} |
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|
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/*---------------------*/ |
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/* driver registration */ |
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/*---------------------*/ |
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/* table of devices that work with this driver */ |
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static const struct usb_device_id iowarrior_ids[] = { |
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{USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)}, |
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{USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)}, |
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{USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)}, |
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{USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)}, |
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{USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)}, |
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{USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24SAG)}, |
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{USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56AM)}, |
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{USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW28)}, |
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{USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW28L)}, |
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{USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW100)}, |
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{} /* Terminating entry */ |
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}; |
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MODULE_DEVICE_TABLE(usb, iowarrior_ids); |
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|
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/* |
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* USB callback handler for reading data |
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*/ |
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static void iowarrior_callback(struct urb *urb) |
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{ |
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struct iowarrior *dev = urb->context; |
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int intr_idx; |
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int read_idx; |
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int aux_idx; |
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int offset; |
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int status = urb->status; |
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int retval; |
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switch (status) { |
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case 0: |
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/* success */ |
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break; |
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case -ECONNRESET: |
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case -ENOENT: |
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case -ESHUTDOWN: |
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return; |
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default: |
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goto exit; |
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} |
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intr_idx = atomic_read(&dev->intr_idx); |
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/* aux_idx become previous intr_idx */ |
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aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1); |
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read_idx = atomic_read(&dev->read_idx); |
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/* queue is not empty and it's interface 0 */ |
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if ((intr_idx != read_idx) |
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&& (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) { |
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/* + 1 for serial number */ |
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offset = aux_idx * (dev->report_size + 1); |
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if (!memcmp |
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(dev->read_queue + offset, urb->transfer_buffer, |
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dev->report_size)) { |
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/* equal values on interface 0 will be ignored */ |
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goto exit; |
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} |
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} |
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/* aux_idx become next intr_idx */ |
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aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1); |
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if (read_idx == aux_idx) { |
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/* queue full, dropping oldest input */ |
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read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx; |
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atomic_set(&dev->read_idx, read_idx); |
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atomic_set(&dev->overflow_flag, 1); |
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} |
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/* +1 for serial number */ |
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offset = intr_idx * (dev->report_size + 1); |
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memcpy(dev->read_queue + offset, urb->transfer_buffer, |
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dev->report_size); |
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*(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++; |
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atomic_set(&dev->intr_idx, aux_idx); |
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/* tell the blocking read about the new data */ |
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wake_up_interruptible(&dev->read_wait); |
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exit: |
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retval = usb_submit_urb(urb, GFP_ATOMIC); |
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if (retval) |
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dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n", |
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__func__, retval); |
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} |
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/* |
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* USB Callback handler for write-ops |
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*/ |
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static void iowarrior_write_callback(struct urb *urb) |
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{ |
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struct iowarrior *dev; |
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int status = urb->status; |
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dev = urb->context; |
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/* sync/async unlink faults aren't errors */ |
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if (status && |
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!(status == -ENOENT || |
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status == -ECONNRESET || status == -ESHUTDOWN)) { |
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dev_dbg(&dev->interface->dev, |
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"nonzero write bulk status received: %d\n", status); |
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} |
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/* free up our allocated buffer */ |
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usb_free_coherent(urb->dev, urb->transfer_buffer_length, |
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urb->transfer_buffer, urb->transfer_dma); |
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/* tell a waiting writer the interrupt-out-pipe is available again */ |
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atomic_dec(&dev->write_busy); |
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wake_up_interruptible(&dev->write_wait); |
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} |
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/* |
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* iowarrior_delete |
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*/ |
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static inline void iowarrior_delete(struct iowarrior *dev) |
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{ |
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dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor); |
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kfree(dev->int_in_buffer); |
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usb_free_urb(dev->int_in_urb); |
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kfree(dev->read_queue); |
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usb_put_intf(dev->interface); |
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kfree(dev); |
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} |
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/*---------------------*/ |
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/* fops implementation */ |
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/*---------------------*/ |
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static int read_index(struct iowarrior *dev) |
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{ |
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int intr_idx, read_idx; |
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read_idx = atomic_read(&dev->read_idx); |
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intr_idx = atomic_read(&dev->intr_idx); |
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return (read_idx == intr_idx ? -1 : read_idx); |
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} |
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/* |
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* iowarrior_read |
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*/ |
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static ssize_t iowarrior_read(struct file *file, char __user *buffer, |
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size_t count, loff_t *ppos) |
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{ |
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struct iowarrior *dev; |
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int read_idx; |
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int offset; |
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dev = file->private_data; |
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/* verify that the device wasn't unplugged */ |
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if (!dev || !dev->present) |
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return -ENODEV; |
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dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n", |
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dev->minor, count); |
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/* read count must be packet size (+ time stamp) */ |
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if ((count != dev->report_size) |
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&& (count != (dev->report_size + 1))) |
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return -EINVAL; |
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/* repeat until no buffer overrun in callback handler occur */ |
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do { |
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atomic_set(&dev->overflow_flag, 0); |
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if ((read_idx = read_index(dev)) == -1) { |
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/* queue empty */ |
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if (file->f_flags & O_NONBLOCK) |
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return -EAGAIN; |
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else { |
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//next line will return when there is either new data, or the device is unplugged |
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int r = wait_event_interruptible(dev->read_wait, |
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(!dev->present |
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|| (read_idx = |
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read_index |
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(dev)) != |
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-1)); |
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if (r) { |
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//we were interrupted by a signal |
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return -ERESTART; |
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} |
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if (!dev->present) { |
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//The device was unplugged |
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return -ENODEV; |
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} |
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if (read_idx == -1) { |
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// Can this happen ??? |
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return 0; |
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} |
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} |
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} |
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|
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offset = read_idx * (dev->report_size + 1); |
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if (copy_to_user(buffer, dev->read_queue + offset, count)) { |
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return -EFAULT; |
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} |
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} while (atomic_read(&dev->overflow_flag)); |
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|
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read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx; |
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atomic_set(&dev->read_idx, read_idx); |
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return count; |
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} |
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|
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/* |
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* iowarrior_write |
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*/ |
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static ssize_t iowarrior_write(struct file *file, |
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const char __user *user_buffer, |
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size_t count, loff_t *ppos) |
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{ |
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struct iowarrior *dev; |
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int retval = 0; |
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char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */ |
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struct urb *int_out_urb = NULL; |
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dev = file->private_data; |
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mutex_lock(&dev->mutex); |
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/* verify that the device wasn't unplugged */ |
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if (!dev->present) { |
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retval = -ENODEV; |
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goto exit; |
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} |
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dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n", |
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dev->minor, count); |
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/* if count is 0 we're already done */ |
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if (count == 0) { |
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retval = 0; |
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goto exit; |
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} |
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/* We only accept full reports */ |
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if (count != dev->report_size) { |
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retval = -EINVAL; |
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goto exit; |
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} |
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switch (dev->product_id) { |
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case USB_DEVICE_ID_CODEMERCS_IOW24: |
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case USB_DEVICE_ID_CODEMERCS_IOW24SAG: |
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case USB_DEVICE_ID_CODEMERCS_IOWPV1: |
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case USB_DEVICE_ID_CODEMERCS_IOWPV2: |
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case USB_DEVICE_ID_CODEMERCS_IOW40: |
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/* IOW24 and IOW40 use a synchronous call */ |
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buf = memdup_user(user_buffer, count); |
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if (IS_ERR(buf)) { |
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retval = PTR_ERR(buf); |
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goto exit; |
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} |
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retval = usb_set_report(dev->interface, 2, 0, buf, count); |
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kfree(buf); |
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goto exit; |
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case USB_DEVICE_ID_CODEMERCS_IOW56: |
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case USB_DEVICE_ID_CODEMERCS_IOW56AM: |
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case USB_DEVICE_ID_CODEMERCS_IOW28: |
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case USB_DEVICE_ID_CODEMERCS_IOW28L: |
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case USB_DEVICE_ID_CODEMERCS_IOW100: |
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/* The IOW56 uses asynchronous IO and more urbs */ |
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if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) { |
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/* Wait until we are below the limit for submitted urbs */ |
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if (file->f_flags & O_NONBLOCK) { |
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retval = -EAGAIN; |
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goto exit; |
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} else { |
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retval = wait_event_interruptible(dev->write_wait, |
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(!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT))); |
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if (retval) { |
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/* we were interrupted by a signal */ |
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retval = -ERESTART; |
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goto exit; |
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} |
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if (!dev->present) { |
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/* The device was unplugged */ |
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retval = -ENODEV; |
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goto exit; |
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} |
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if (!dev->opened) { |
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/* We were closed while waiting for an URB */ |
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retval = -ENODEV; |
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goto exit; |
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} |
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} |
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} |
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atomic_inc(&dev->write_busy); |
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int_out_urb = usb_alloc_urb(0, GFP_KERNEL); |
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if (!int_out_urb) { |
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retval = -ENOMEM; |
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goto error_no_urb; |
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} |
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buf = usb_alloc_coherent(dev->udev, dev->report_size, |
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GFP_KERNEL, &int_out_urb->transfer_dma); |
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if (!buf) { |
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retval = -ENOMEM; |
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dev_dbg(&dev->interface->dev, |
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"Unable to allocate buffer\n"); |
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goto error_no_buffer; |
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} |
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usb_fill_int_urb(int_out_urb, dev->udev, |
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usb_sndintpipe(dev->udev, |
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dev->int_out_endpoint->bEndpointAddress), |
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buf, dev->report_size, |
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iowarrior_write_callback, dev, |
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dev->int_out_endpoint->bInterval); |
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int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
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if (copy_from_user(buf, user_buffer, count)) { |
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retval = -EFAULT; |
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goto error; |
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} |
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usb_anchor_urb(int_out_urb, &dev->submitted); |
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retval = usb_submit_urb(int_out_urb, GFP_KERNEL); |
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if (retval) { |
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dev_dbg(&dev->interface->dev, |
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"submit error %d for urb nr.%d\n", |
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retval, atomic_read(&dev->write_busy)); |
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usb_unanchor_urb(int_out_urb); |
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goto error; |
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} |
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/* submit was ok */ |
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retval = count; |
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usb_free_urb(int_out_urb); |
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goto exit; |
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default: |
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/* what do we have here ? An unsupported Product-ID ? */ |
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dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n", |
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__func__, dev->product_id); |
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retval = -EFAULT; |
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goto exit; |
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} |
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error: |
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usb_free_coherent(dev->udev, dev->report_size, buf, |
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int_out_urb->transfer_dma); |
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error_no_buffer: |
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usb_free_urb(int_out_urb); |
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error_no_urb: |
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atomic_dec(&dev->write_busy); |
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wake_up_interruptible(&dev->write_wait); |
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exit: |
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mutex_unlock(&dev->mutex); |
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return retval; |
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} |
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|
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/* |
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* iowarrior_ioctl |
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*/ |
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static long iowarrior_ioctl(struct file *file, unsigned int cmd, |
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unsigned long arg) |
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{ |
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struct iowarrior *dev = NULL; |
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__u8 *buffer; |
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__u8 __user *user_buffer; |
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int retval; |
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int io_res; /* checks for bytes read/written and copy_to/from_user results */ |
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|
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dev = file->private_data; |
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if (!dev) |
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return -ENODEV; |
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|
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buffer = kzalloc(dev->report_size, GFP_KERNEL); |
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if (!buffer) |
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return -ENOMEM; |
|
|
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mutex_lock(&dev->mutex); |
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|
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/* verify that the device wasn't unplugged */ |
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if (!dev->present) { |
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retval = -ENODEV; |
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goto error_out; |
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} |
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|
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dev_dbg(&dev->interface->dev, "minor %d, cmd 0x%.4x, arg %ld\n", |
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dev->minor, cmd, arg); |
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|
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retval = 0; |
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io_res = 0; |
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switch (cmd) { |
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case IOW_WRITE: |
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if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 || |
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dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24SAG || |
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dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 || |
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dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 || |
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dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) { |
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user_buffer = (__u8 __user *)arg; |
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io_res = copy_from_user(buffer, user_buffer, |
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dev->report_size); |
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if (io_res) { |
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retval = -EFAULT; |
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} else { |
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io_res = usb_set_report(dev->interface, 2, 0, |
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buffer, |
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dev->report_size); |
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if (io_res < 0) |
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retval = io_res; |
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} |
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} else { |
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retval = -EINVAL; |
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dev_err(&dev->interface->dev, |
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"ioctl 'IOW_WRITE' is not supported for product=0x%x.\n", |
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dev->product_id); |
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} |
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break; |
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case IOW_READ: |
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user_buffer = (__u8 __user *)arg; |
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io_res = usb_get_report(dev->udev, |
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dev->interface->cur_altsetting, 1, 0, |
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buffer, dev->report_size); |
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if (io_res < 0) |
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retval = io_res; |
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else { |
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io_res = copy_to_user(user_buffer, buffer, dev->report_size); |
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if (io_res) |
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retval = -EFAULT; |
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} |
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break; |
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case IOW_GETINFO: |
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{ |
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/* Report available information for the device */ |
|
struct iowarrior_info info; |
|
/* needed for power consumption */ |
|
struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc; |
|
|
|
memset(&info, 0, sizeof(info)); |
|
/* directly from the descriptor */ |
|
info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor); |
|
info.product = dev->product_id; |
|
info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice); |
|
|
|
/* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */ |
|
info.speed = dev->udev->speed; |
|
info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber; |
|
info.report_size = dev->report_size; |
|
|
|
/* serial number string has been read earlier 8 chars or empty string */ |
|
memcpy(info.serial, dev->chip_serial, |
|
sizeof(dev->chip_serial)); |
|
if (cfg_descriptor == NULL) { |
|
info.power = -1; /* no information available */ |
|
} else { |
|
/* the MaxPower is stored in units of 2mA to make it fit into a byte-value */ |
|
info.power = cfg_descriptor->bMaxPower * 2; |
|
} |
|
io_res = copy_to_user((struct iowarrior_info __user *)arg, &info, |
|
sizeof(struct iowarrior_info)); |
|
if (io_res) |
|
retval = -EFAULT; |
|
break; |
|
} |
|
default: |
|
/* return that we did not understand this ioctl call */ |
|
retval = -ENOTTY; |
|
break; |
|
} |
|
error_out: |
|
/* unlock the device */ |
|
mutex_unlock(&dev->mutex); |
|
kfree(buffer); |
|
return retval; |
|
} |
|
|
|
/* |
|
* iowarrior_open |
|
*/ |
|
static int iowarrior_open(struct inode *inode, struct file *file) |
|
{ |
|
struct iowarrior *dev = NULL; |
|
struct usb_interface *interface; |
|
int subminor; |
|
int retval = 0; |
|
|
|
subminor = iminor(inode); |
|
|
|
interface = usb_find_interface(&iowarrior_driver, subminor); |
|
if (!interface) { |
|
pr_err("%s - error, can't find device for minor %d\n", |
|
__func__, subminor); |
|
return -ENODEV; |
|
} |
|
|
|
dev = usb_get_intfdata(interface); |
|
if (!dev) |
|
return -ENODEV; |
|
|
|
mutex_lock(&dev->mutex); |
|
|
|
/* Only one process can open each device, no sharing. */ |
|
if (dev->opened) { |
|
retval = -EBUSY; |
|
goto out; |
|
} |
|
|
|
/* setup interrupt handler for receiving values */ |
|
if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) { |
|
dev_err(&interface->dev, "Error %d while submitting URB\n", retval); |
|
retval = -EFAULT; |
|
goto out; |
|
} |
|
/* increment our usage count for the driver */ |
|
++dev->opened; |
|
/* save our object in the file's private structure */ |
|
file->private_data = dev; |
|
retval = 0; |
|
|
|
out: |
|
mutex_unlock(&dev->mutex); |
|
return retval; |
|
} |
|
|
|
/* |
|
* iowarrior_release |
|
*/ |
|
static int iowarrior_release(struct inode *inode, struct file *file) |
|
{ |
|
struct iowarrior *dev; |
|
int retval = 0; |
|
|
|
dev = file->private_data; |
|
if (!dev) |
|
return -ENODEV; |
|
|
|
dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor); |
|
|
|
/* lock our device */ |
|
mutex_lock(&dev->mutex); |
|
|
|
if (dev->opened <= 0) { |
|
retval = -ENODEV; /* close called more than once */ |
|
mutex_unlock(&dev->mutex); |
|
} else { |
|
dev->opened = 0; /* we're closing now */ |
|
retval = 0; |
|
if (dev->present) { |
|
/* |
|
The device is still connected so we only shutdown |
|
pending read-/write-ops. |
|
*/ |
|
usb_kill_urb(dev->int_in_urb); |
|
wake_up_interruptible(&dev->read_wait); |
|
wake_up_interruptible(&dev->write_wait); |
|
mutex_unlock(&dev->mutex); |
|
} else { |
|
/* The device was unplugged, cleanup resources */ |
|
mutex_unlock(&dev->mutex); |
|
iowarrior_delete(dev); |
|
} |
|
} |
|
return retval; |
|
} |
|
|
|
static __poll_t iowarrior_poll(struct file *file, poll_table * wait) |
|
{ |
|
struct iowarrior *dev = file->private_data; |
|
__poll_t mask = 0; |
|
|
|
if (!dev->present) |
|
return EPOLLERR | EPOLLHUP; |
|
|
|
poll_wait(file, &dev->read_wait, wait); |
|
poll_wait(file, &dev->write_wait, wait); |
|
|
|
if (!dev->present) |
|
return EPOLLERR | EPOLLHUP; |
|
|
|
if (read_index(dev) != -1) |
|
mask |= EPOLLIN | EPOLLRDNORM; |
|
|
|
if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT) |
|
mask |= EPOLLOUT | EPOLLWRNORM; |
|
return mask; |
|
} |
|
|
|
/* |
|
* File operations needed when we register this driver. |
|
* This assumes that this driver NEEDS file operations, |
|
* of course, which means that the driver is expected |
|
* to have a node in the /dev directory. If the USB |
|
* device were for a network interface then the driver |
|
* would use "struct net_driver" instead, and a serial |
|
* device would use "struct tty_driver". |
|
*/ |
|
static const struct file_operations iowarrior_fops = { |
|
.owner = THIS_MODULE, |
|
.write = iowarrior_write, |
|
.read = iowarrior_read, |
|
.unlocked_ioctl = iowarrior_ioctl, |
|
.open = iowarrior_open, |
|
.release = iowarrior_release, |
|
.poll = iowarrior_poll, |
|
.llseek = noop_llseek, |
|
}; |
|
|
|
static char *iowarrior_devnode(struct device *dev, umode_t *mode) |
|
{ |
|
return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); |
|
} |
|
|
|
/* |
|
* usb class driver info in order to get a minor number from the usb core, |
|
* and to have the device registered with devfs and the driver core |
|
*/ |
|
static struct usb_class_driver iowarrior_class = { |
|
.name = "iowarrior%d", |
|
.devnode = iowarrior_devnode, |
|
.fops = &iowarrior_fops, |
|
.minor_base = IOWARRIOR_MINOR_BASE, |
|
}; |
|
|
|
/*---------------------------------*/ |
|
/* probe and disconnect functions */ |
|
/*---------------------------------*/ |
|
/* |
|
* iowarrior_probe |
|
* |
|
* Called by the usb core when a new device is connected that it thinks |
|
* this driver might be interested in. |
|
*/ |
|
static int iowarrior_probe(struct usb_interface *interface, |
|
const struct usb_device_id *id) |
|
{ |
|
struct usb_device *udev = interface_to_usbdev(interface); |
|
struct iowarrior *dev = NULL; |
|
struct usb_host_interface *iface_desc; |
|
int retval = -ENOMEM; |
|
int res; |
|
|
|
/* allocate memory for our device state and initialize it */ |
|
dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL); |
|
if (!dev) |
|
return retval; |
|
|
|
mutex_init(&dev->mutex); |
|
|
|
atomic_set(&dev->intr_idx, 0); |
|
atomic_set(&dev->read_idx, 0); |
|
atomic_set(&dev->overflow_flag, 0); |
|
init_waitqueue_head(&dev->read_wait); |
|
atomic_set(&dev->write_busy, 0); |
|
init_waitqueue_head(&dev->write_wait); |
|
|
|
dev->udev = udev; |
|
dev->interface = usb_get_intf(interface); |
|
|
|
iface_desc = interface->cur_altsetting; |
|
dev->product_id = le16_to_cpu(udev->descriptor.idProduct); |
|
|
|
init_usb_anchor(&dev->submitted); |
|
|
|
res = usb_find_last_int_in_endpoint(iface_desc, &dev->int_in_endpoint); |
|
if (res) { |
|
dev_err(&interface->dev, "no interrupt-in endpoint found\n"); |
|
retval = res; |
|
goto error; |
|
} |
|
|
|
if ((dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56) || |
|
(dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56AM) || |
|
(dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW28) || |
|
(dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW28L) || |
|
(dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW100)) { |
|
res = usb_find_last_int_out_endpoint(iface_desc, |
|
&dev->int_out_endpoint); |
|
if (res) { |
|
dev_err(&interface->dev, "no interrupt-out endpoint found\n"); |
|
retval = res; |
|
goto error; |
|
} |
|
} |
|
|
|
/* we have to check the report_size often, so remember it in the endianness suitable for our machine */ |
|
dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint); |
|
|
|
/* |
|
* Some devices need the report size to be different than the |
|
* endpoint size. |
|
*/ |
|
if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) { |
|
switch (dev->product_id) { |
|
case USB_DEVICE_ID_CODEMERCS_IOW56: |
|
case USB_DEVICE_ID_CODEMERCS_IOW56AM: |
|
dev->report_size = 7; |
|
break; |
|
|
|
case USB_DEVICE_ID_CODEMERCS_IOW28: |
|
case USB_DEVICE_ID_CODEMERCS_IOW28L: |
|
dev->report_size = 4; |
|
break; |
|
|
|
case USB_DEVICE_ID_CODEMERCS_IOW100: |
|
dev->report_size = 13; |
|
break; |
|
} |
|
} |
|
|
|
/* create the urb and buffer for reading */ |
|
dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL); |
|
if (!dev->int_in_urb) |
|
goto error; |
|
dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL); |
|
if (!dev->int_in_buffer) |
|
goto error; |
|
usb_fill_int_urb(dev->int_in_urb, dev->udev, |
|
usb_rcvintpipe(dev->udev, |
|
dev->int_in_endpoint->bEndpointAddress), |
|
dev->int_in_buffer, dev->report_size, |
|
iowarrior_callback, dev, |
|
dev->int_in_endpoint->bInterval); |
|
/* create an internal buffer for interrupt data from the device */ |
|
dev->read_queue = |
|
kmalloc_array(dev->report_size + 1, MAX_INTERRUPT_BUFFER, |
|
GFP_KERNEL); |
|
if (!dev->read_queue) |
|
goto error; |
|
/* Get the serial-number of the chip */ |
|
memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial)); |
|
usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial, |
|
sizeof(dev->chip_serial)); |
|
if (strlen(dev->chip_serial) != 8) |
|
memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial)); |
|
|
|
/* Set the idle timeout to 0, if this is interface 0 */ |
|
if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) { |
|
usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
|
0x0A, |
|
USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, |
|
0, NULL, 0, USB_CTRL_SET_TIMEOUT); |
|
} |
|
/* allow device read and ioctl */ |
|
dev->present = 1; |
|
|
|
/* we can register the device now, as it is ready */ |
|
usb_set_intfdata(interface, dev); |
|
|
|
retval = usb_register_dev(interface, &iowarrior_class); |
|
if (retval) { |
|
/* something prevented us from registering this driver */ |
|
dev_err(&interface->dev, "Not able to get a minor for this device.\n"); |
|
goto error; |
|
} |
|
|
|
dev->minor = interface->minor; |
|
|
|
/* let the user know what node this device is now attached to */ |
|
dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d " |
|
"now attached to iowarrior%d\n", dev->product_id, dev->chip_serial, |
|
iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE); |
|
return retval; |
|
|
|
error: |
|
iowarrior_delete(dev); |
|
return retval; |
|
} |
|
|
|
/* |
|
* iowarrior_disconnect |
|
* |
|
* Called by the usb core when the device is removed from the system. |
|
*/ |
|
static void iowarrior_disconnect(struct usb_interface *interface) |
|
{ |
|
struct iowarrior *dev = usb_get_intfdata(interface); |
|
int minor = dev->minor; |
|
|
|
usb_deregister_dev(interface, &iowarrior_class); |
|
|
|
mutex_lock(&dev->mutex); |
|
|
|
/* prevent device read, write and ioctl */ |
|
dev->present = 0; |
|
|
|
if (dev->opened) { |
|
/* There is a process that holds a filedescriptor to the device , |
|
so we only shutdown read-/write-ops going on. |
|
Deleting the device is postponed until close() was called. |
|
*/ |
|
usb_kill_urb(dev->int_in_urb); |
|
usb_kill_anchored_urbs(&dev->submitted); |
|
wake_up_interruptible(&dev->read_wait); |
|
wake_up_interruptible(&dev->write_wait); |
|
mutex_unlock(&dev->mutex); |
|
} else { |
|
/* no process is using the device, cleanup now */ |
|
mutex_unlock(&dev->mutex); |
|
iowarrior_delete(dev); |
|
} |
|
|
|
dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n", |
|
minor - IOWARRIOR_MINOR_BASE); |
|
} |
|
|
|
/* usb specific object needed to register this driver with the usb subsystem */ |
|
static struct usb_driver iowarrior_driver = { |
|
.name = "iowarrior", |
|
.probe = iowarrior_probe, |
|
.disconnect = iowarrior_disconnect, |
|
.id_table = iowarrior_ids, |
|
}; |
|
|
|
module_usb_driver(iowarrior_driver);
|
|
|