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1141 lines
26 KiB
1141 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* Copyright (c) 2021, Linaro Ltd <[email protected]> */ |
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|
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#include <linux/err.h> |
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#include <linux/errno.h> |
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#include <linux/fs.h> |
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#include <linux/init.h> |
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#include <linux/idr.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/poll.h> |
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#include <linux/skbuff.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> |
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#include <linux/termios.h> |
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#include <linux/wwan.h> |
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#include <net/rtnetlink.h> |
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#include <uapi/linux/wwan.h> |
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|
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/* Maximum number of minors in use */ |
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#define WWAN_MAX_MINORS (1 << MINORBITS) |
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|
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static DEFINE_MUTEX(wwan_register_lock); /* WWAN device create|remove lock */ |
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static DEFINE_IDA(minors); /* minors for WWAN port chardevs */ |
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static DEFINE_IDA(wwan_dev_ids); /* for unique WWAN device IDs */ |
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static struct class *wwan_class; |
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static int wwan_major; |
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#define to_wwan_dev(d) container_of(d, struct wwan_device, dev) |
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#define to_wwan_port(d) container_of(d, struct wwan_port, dev) |
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|
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/* WWAN port flags */ |
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#define WWAN_PORT_TX_OFF 0 |
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|
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/** |
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* struct wwan_device - The structure that defines a WWAN device |
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* |
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* @id: WWAN device unique ID. |
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* @dev: Underlying device. |
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* @port_id: Current available port ID to pick. |
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* @ops: wwan device ops |
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* @ops_ctxt: context to pass to ops |
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*/ |
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struct wwan_device { |
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unsigned int id; |
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struct device dev; |
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atomic_t port_id; |
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const struct wwan_ops *ops; |
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void *ops_ctxt; |
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}; |
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|
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/** |
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* struct wwan_port - The structure that defines a WWAN port |
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* @type: Port type |
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* @start_count: Port start counter |
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* @flags: Store port state and capabilities |
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* @ops: Pointer to WWAN port operations |
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* @ops_lock: Protect port ops |
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* @dev: Underlying device |
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* @rxq: Buffer inbound queue |
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* @waitqueue: The waitqueue for port fops (read/write/poll) |
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* @data_lock: Port specific data access serialization |
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* @at_data: AT port specific data |
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*/ |
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struct wwan_port { |
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enum wwan_port_type type; |
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unsigned int start_count; |
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unsigned long flags; |
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const struct wwan_port_ops *ops; |
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struct mutex ops_lock; /* Serialize ops + protect against removal */ |
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struct device dev; |
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struct sk_buff_head rxq; |
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wait_queue_head_t waitqueue; |
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struct mutex data_lock; /* Port specific data access serialization */ |
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union { |
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struct { |
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struct ktermios termios; |
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int mdmbits; |
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} at_data; |
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}; |
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}; |
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static ssize_t index_show(struct device *dev, struct device_attribute *attr, char *buf) |
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{ |
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struct wwan_device *wwan = to_wwan_dev(dev); |
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|
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return sprintf(buf, "%d\n", wwan->id); |
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} |
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static DEVICE_ATTR_RO(index); |
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static struct attribute *wwan_dev_attrs[] = { |
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&dev_attr_index.attr, |
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NULL, |
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}; |
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ATTRIBUTE_GROUPS(wwan_dev); |
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|
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static void wwan_dev_destroy(struct device *dev) |
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{ |
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struct wwan_device *wwandev = to_wwan_dev(dev); |
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ida_free(&wwan_dev_ids, wwandev->id); |
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kfree(wwandev); |
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} |
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static const struct device_type wwan_dev_type = { |
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.name = "wwan_dev", |
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.release = wwan_dev_destroy, |
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.groups = wwan_dev_groups, |
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}; |
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|
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static int wwan_dev_parent_match(struct device *dev, const void *parent) |
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{ |
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return (dev->type == &wwan_dev_type && |
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(dev->parent == parent || dev == parent)); |
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} |
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static struct wwan_device *wwan_dev_get_by_parent(struct device *parent) |
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{ |
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struct device *dev; |
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dev = class_find_device(wwan_class, NULL, parent, wwan_dev_parent_match); |
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if (!dev) |
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return ERR_PTR(-ENODEV); |
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return to_wwan_dev(dev); |
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} |
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static int wwan_dev_name_match(struct device *dev, const void *name) |
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{ |
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return dev->type == &wwan_dev_type && |
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strcmp(dev_name(dev), name) == 0; |
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} |
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static struct wwan_device *wwan_dev_get_by_name(const char *name) |
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{ |
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struct device *dev; |
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dev = class_find_device(wwan_class, NULL, name, wwan_dev_name_match); |
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if (!dev) |
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return ERR_PTR(-ENODEV); |
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return to_wwan_dev(dev); |
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} |
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/* This function allocates and registers a new WWAN device OR if a WWAN device |
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* already exist for the given parent, it gets a reference and return it. |
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* This function is not exported (for now), it is called indirectly via |
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* wwan_create_port(). |
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*/ |
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static struct wwan_device *wwan_create_dev(struct device *parent) |
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{ |
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struct wwan_device *wwandev; |
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int err, id; |
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/* The 'find-alloc-register' operation must be protected against |
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* concurrent execution, a WWAN device is possibly shared between |
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* multiple callers or concurrently unregistered from wwan_remove_dev(). |
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*/ |
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mutex_lock(&wwan_register_lock); |
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/* If wwandev already exists, return it */ |
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wwandev = wwan_dev_get_by_parent(parent); |
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if (!IS_ERR(wwandev)) |
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goto done_unlock; |
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id = ida_alloc(&wwan_dev_ids, GFP_KERNEL); |
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if (id < 0) { |
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wwandev = ERR_PTR(id); |
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goto done_unlock; |
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} |
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wwandev = kzalloc(sizeof(*wwandev), GFP_KERNEL); |
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if (!wwandev) { |
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wwandev = ERR_PTR(-ENOMEM); |
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ida_free(&wwan_dev_ids, id); |
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goto done_unlock; |
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} |
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wwandev->dev.parent = parent; |
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wwandev->dev.class = wwan_class; |
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wwandev->dev.type = &wwan_dev_type; |
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wwandev->id = id; |
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dev_set_name(&wwandev->dev, "wwan%d", wwandev->id); |
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err = device_register(&wwandev->dev); |
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if (err) { |
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put_device(&wwandev->dev); |
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wwandev = ERR_PTR(err); |
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goto done_unlock; |
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} |
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done_unlock: |
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mutex_unlock(&wwan_register_lock); |
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return wwandev; |
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} |
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static int is_wwan_child(struct device *dev, void *data) |
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{ |
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return dev->class == wwan_class; |
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} |
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static void wwan_remove_dev(struct wwan_device *wwandev) |
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{ |
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int ret; |
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/* Prevent concurrent picking from wwan_create_dev */ |
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mutex_lock(&wwan_register_lock); |
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/* WWAN device is created and registered (get+add) along with its first |
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* child port, and subsequent port registrations only grab a reference |
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* (get). The WWAN device must then be unregistered (del+put) along with |
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* its last port, and reference simply dropped (put) otherwise. In the |
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* same fashion, we must not unregister it when the ops are still there. |
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*/ |
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if (wwandev->ops) |
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ret = 1; |
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else |
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ret = device_for_each_child(&wwandev->dev, NULL, is_wwan_child); |
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if (!ret) |
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device_unregister(&wwandev->dev); |
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else |
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put_device(&wwandev->dev); |
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mutex_unlock(&wwan_register_lock); |
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} |
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/* ------- WWAN port management ------- */ |
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static const struct { |
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const char * const name; /* Port type name */ |
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const char * const devsuf; /* Port devce name suffix */ |
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} wwan_port_types[WWAN_PORT_MAX + 1] = { |
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[WWAN_PORT_AT] = { |
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.name = "AT", |
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.devsuf = "at", |
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}, |
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[WWAN_PORT_MBIM] = { |
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.name = "MBIM", |
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.devsuf = "mbim", |
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}, |
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[WWAN_PORT_QMI] = { |
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.name = "QMI", |
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.devsuf = "qmi", |
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}, |
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[WWAN_PORT_QCDM] = { |
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.name = "QCDM", |
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.devsuf = "qcdm", |
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}, |
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[WWAN_PORT_FIREHOSE] = { |
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.name = "FIREHOSE", |
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.devsuf = "firehose", |
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}, |
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}; |
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static ssize_t type_show(struct device *dev, struct device_attribute *attr, |
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char *buf) |
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{ |
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struct wwan_port *port = to_wwan_port(dev); |
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return sprintf(buf, "%s\n", wwan_port_types[port->type].name); |
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} |
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static DEVICE_ATTR_RO(type); |
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static struct attribute *wwan_port_attrs[] = { |
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&dev_attr_type.attr, |
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NULL, |
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}; |
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ATTRIBUTE_GROUPS(wwan_port); |
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static void wwan_port_destroy(struct device *dev) |
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{ |
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struct wwan_port *port = to_wwan_port(dev); |
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ida_free(&minors, MINOR(port->dev.devt)); |
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mutex_destroy(&port->data_lock); |
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mutex_destroy(&port->ops_lock); |
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kfree(port); |
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} |
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static const struct device_type wwan_port_dev_type = { |
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.name = "wwan_port", |
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.release = wwan_port_destroy, |
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.groups = wwan_port_groups, |
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}; |
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static int wwan_port_minor_match(struct device *dev, const void *minor) |
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{ |
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return (dev->type == &wwan_port_dev_type && |
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MINOR(dev->devt) == *(unsigned int *)minor); |
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} |
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static struct wwan_port *wwan_port_get_by_minor(unsigned int minor) |
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{ |
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struct device *dev; |
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dev = class_find_device(wwan_class, NULL, &minor, wwan_port_minor_match); |
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if (!dev) |
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return ERR_PTR(-ENODEV); |
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return to_wwan_port(dev); |
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} |
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/* Allocate and set unique name based on passed format |
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* |
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* Name allocation approach is highly inspired by the __dev_alloc_name() |
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* function. |
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* |
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* To avoid names collision, the caller must prevent the new port device |
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* registration as well as concurrent invocation of this function. |
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*/ |
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static int __wwan_port_dev_assign_name(struct wwan_port *port, const char *fmt) |
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{ |
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struct wwan_device *wwandev = to_wwan_dev(port->dev.parent); |
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const unsigned int max_ports = PAGE_SIZE * 8; |
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struct class_dev_iter iter; |
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unsigned long *idmap; |
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struct device *dev; |
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char buf[0x20]; |
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int id; |
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idmap = (unsigned long *)get_zeroed_page(GFP_KERNEL); |
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if (!idmap) |
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return -ENOMEM; |
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/* Collect ids of same name format ports */ |
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class_dev_iter_init(&iter, wwan_class, NULL, &wwan_port_dev_type); |
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while ((dev = class_dev_iter_next(&iter))) { |
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if (dev->parent != &wwandev->dev) |
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continue; |
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if (sscanf(dev_name(dev), fmt, &id) != 1) |
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continue; |
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if (id < 0 || id >= max_ports) |
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continue; |
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set_bit(id, idmap); |
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} |
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class_dev_iter_exit(&iter); |
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/* Allocate unique id */ |
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id = find_first_zero_bit(idmap, max_ports); |
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free_page((unsigned long)idmap); |
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snprintf(buf, sizeof(buf), fmt, id); /* Name generation */ |
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dev = device_find_child_by_name(&wwandev->dev, buf); |
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if (dev) { |
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put_device(dev); |
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return -ENFILE; |
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} |
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|
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return dev_set_name(&port->dev, buf); |
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} |
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struct wwan_port *wwan_create_port(struct device *parent, |
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enum wwan_port_type type, |
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const struct wwan_port_ops *ops, |
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void *drvdata) |
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{ |
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struct wwan_device *wwandev; |
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struct wwan_port *port; |
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char namefmt[0x20]; |
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int minor, err; |
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|
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if (type > WWAN_PORT_MAX || !ops) |
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return ERR_PTR(-EINVAL); |
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|
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/* A port is always a child of a WWAN device, retrieve (allocate or |
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* pick) the WWAN device based on the provided parent device. |
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*/ |
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wwandev = wwan_create_dev(parent); |
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if (IS_ERR(wwandev)) |
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return ERR_CAST(wwandev); |
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|
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/* A port is exposed as character device, get a minor */ |
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minor = ida_alloc_range(&minors, 0, WWAN_MAX_MINORS - 1, GFP_KERNEL); |
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if (minor < 0) { |
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err = minor; |
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goto error_wwandev_remove; |
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} |
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port = kzalloc(sizeof(*port), GFP_KERNEL); |
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if (!port) { |
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err = -ENOMEM; |
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ida_free(&minors, minor); |
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goto error_wwandev_remove; |
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} |
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|
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port->type = type; |
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port->ops = ops; |
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mutex_init(&port->ops_lock); |
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skb_queue_head_init(&port->rxq); |
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init_waitqueue_head(&port->waitqueue); |
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mutex_init(&port->data_lock); |
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|
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port->dev.parent = &wwandev->dev; |
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port->dev.class = wwan_class; |
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port->dev.type = &wwan_port_dev_type; |
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port->dev.devt = MKDEV(wwan_major, minor); |
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dev_set_drvdata(&port->dev, drvdata); |
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|
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/* allocate unique name based on wwan device id, port type and number */ |
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snprintf(namefmt, sizeof(namefmt), "wwan%u%s%%d", wwandev->id, |
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wwan_port_types[port->type].devsuf); |
|
|
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/* Serialize ports registration */ |
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mutex_lock(&wwan_register_lock); |
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|
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__wwan_port_dev_assign_name(port, namefmt); |
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err = device_register(&port->dev); |
|
|
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mutex_unlock(&wwan_register_lock); |
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|
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if (err) |
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goto error_put_device; |
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return port; |
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|
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error_put_device: |
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put_device(&port->dev); |
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error_wwandev_remove: |
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wwan_remove_dev(wwandev); |
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|
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return ERR_PTR(err); |
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} |
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EXPORT_SYMBOL_GPL(wwan_create_port); |
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|
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void wwan_remove_port(struct wwan_port *port) |
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{ |
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struct wwan_device *wwandev = to_wwan_dev(port->dev.parent); |
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|
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mutex_lock(&port->ops_lock); |
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if (port->start_count) |
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port->ops->stop(port); |
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port->ops = NULL; /* Prevent any new port operations (e.g. from fops) */ |
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mutex_unlock(&port->ops_lock); |
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|
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wake_up_interruptible(&port->waitqueue); |
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|
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skb_queue_purge(&port->rxq); |
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dev_set_drvdata(&port->dev, NULL); |
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device_unregister(&port->dev); |
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|
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/* Release related wwan device */ |
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wwan_remove_dev(wwandev); |
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} |
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EXPORT_SYMBOL_GPL(wwan_remove_port); |
|
|
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void wwan_port_rx(struct wwan_port *port, struct sk_buff *skb) |
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{ |
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skb_queue_tail(&port->rxq, skb); |
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wake_up_interruptible(&port->waitqueue); |
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} |
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EXPORT_SYMBOL_GPL(wwan_port_rx); |
|
|
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void wwan_port_txon(struct wwan_port *port) |
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{ |
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clear_bit(WWAN_PORT_TX_OFF, &port->flags); |
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wake_up_interruptible(&port->waitqueue); |
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} |
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EXPORT_SYMBOL_GPL(wwan_port_txon); |
|
|
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void wwan_port_txoff(struct wwan_port *port) |
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{ |
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set_bit(WWAN_PORT_TX_OFF, &port->flags); |
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} |
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EXPORT_SYMBOL_GPL(wwan_port_txoff); |
|
|
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void *wwan_port_get_drvdata(struct wwan_port *port) |
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{ |
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return dev_get_drvdata(&port->dev); |
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} |
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EXPORT_SYMBOL_GPL(wwan_port_get_drvdata); |
|
|
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static int wwan_port_op_start(struct wwan_port *port) |
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{ |
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int ret = 0; |
|
|
|
mutex_lock(&port->ops_lock); |
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if (!port->ops) { /* Port got unplugged */ |
|
ret = -ENODEV; |
|
goto out_unlock; |
|
} |
|
|
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/* If port is already started, don't start again */ |
|
if (!port->start_count) |
|
ret = port->ops->start(port); |
|
|
|
if (!ret) |
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port->start_count++; |
|
|
|
out_unlock: |
|
mutex_unlock(&port->ops_lock); |
|
|
|
return ret; |
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} |
|
|
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static void wwan_port_op_stop(struct wwan_port *port) |
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{ |
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mutex_lock(&port->ops_lock); |
|
port->start_count--; |
|
if (!port->start_count) { |
|
if (port->ops) |
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port->ops->stop(port); |
|
skb_queue_purge(&port->rxq); |
|
} |
|
mutex_unlock(&port->ops_lock); |
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} |
|
|
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static int wwan_port_op_tx(struct wwan_port *port, struct sk_buff *skb, |
|
bool nonblock) |
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{ |
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int ret; |
|
|
|
mutex_lock(&port->ops_lock); |
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if (!port->ops) { /* Port got unplugged */ |
|
ret = -ENODEV; |
|
goto out_unlock; |
|
} |
|
|
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if (nonblock || !port->ops->tx_blocking) |
|
ret = port->ops->tx(port, skb); |
|
else |
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ret = port->ops->tx_blocking(port, skb); |
|
|
|
out_unlock: |
|
mutex_unlock(&port->ops_lock); |
|
|
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return ret; |
|
} |
|
|
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static bool is_read_blocked(struct wwan_port *port) |
|
{ |
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return skb_queue_empty(&port->rxq) && port->ops; |
|
} |
|
|
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static bool is_write_blocked(struct wwan_port *port) |
|
{ |
|
return test_bit(WWAN_PORT_TX_OFF, &port->flags) && port->ops; |
|
} |
|
|
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static int wwan_wait_rx(struct wwan_port *port, bool nonblock) |
|
{ |
|
if (!is_read_blocked(port)) |
|
return 0; |
|
|
|
if (nonblock) |
|
return -EAGAIN; |
|
|
|
if (wait_event_interruptible(port->waitqueue, !is_read_blocked(port))) |
|
return -ERESTARTSYS; |
|
|
|
return 0; |
|
} |
|
|
|
static int wwan_wait_tx(struct wwan_port *port, bool nonblock) |
|
{ |
|
if (!is_write_blocked(port)) |
|
return 0; |
|
|
|
if (nonblock) |
|
return -EAGAIN; |
|
|
|
if (wait_event_interruptible(port->waitqueue, !is_write_blocked(port))) |
|
return -ERESTARTSYS; |
|
|
|
return 0; |
|
} |
|
|
|
static int wwan_port_fops_open(struct inode *inode, struct file *file) |
|
{ |
|
struct wwan_port *port; |
|
int err = 0; |
|
|
|
port = wwan_port_get_by_minor(iminor(inode)); |
|
if (IS_ERR(port)) |
|
return PTR_ERR(port); |
|
|
|
file->private_data = port; |
|
stream_open(inode, file); |
|
|
|
err = wwan_port_op_start(port); |
|
if (err) |
|
put_device(&port->dev); |
|
|
|
return err; |
|
} |
|
|
|
static int wwan_port_fops_release(struct inode *inode, struct file *filp) |
|
{ |
|
struct wwan_port *port = filp->private_data; |
|
|
|
wwan_port_op_stop(port); |
|
put_device(&port->dev); |
|
|
|
return 0; |
|
} |
|
|
|
static ssize_t wwan_port_fops_read(struct file *filp, char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
struct wwan_port *port = filp->private_data; |
|
struct sk_buff *skb; |
|
size_t copied; |
|
int ret; |
|
|
|
ret = wwan_wait_rx(port, !!(filp->f_flags & O_NONBLOCK)); |
|
if (ret) |
|
return ret; |
|
|
|
skb = skb_dequeue(&port->rxq); |
|
if (!skb) |
|
return -EIO; |
|
|
|
copied = min_t(size_t, count, skb->len); |
|
if (copy_to_user(buf, skb->data, copied)) { |
|
kfree_skb(skb); |
|
return -EFAULT; |
|
} |
|
skb_pull(skb, copied); |
|
|
|
/* skb is not fully consumed, keep it in the queue */ |
|
if (skb->len) |
|
skb_queue_head(&port->rxq, skb); |
|
else |
|
consume_skb(skb); |
|
|
|
return copied; |
|
} |
|
|
|
static ssize_t wwan_port_fops_write(struct file *filp, const char __user *buf, |
|
size_t count, loff_t *offp) |
|
{ |
|
struct wwan_port *port = filp->private_data; |
|
struct sk_buff *skb; |
|
int ret; |
|
|
|
ret = wwan_wait_tx(port, !!(filp->f_flags & O_NONBLOCK)); |
|
if (ret) |
|
return ret; |
|
|
|
skb = alloc_skb(count, GFP_KERNEL); |
|
if (!skb) |
|
return -ENOMEM; |
|
|
|
if (copy_from_user(skb_put(skb, count), buf, count)) { |
|
kfree_skb(skb); |
|
return -EFAULT; |
|
} |
|
|
|
ret = wwan_port_op_tx(port, skb, !!(filp->f_flags & O_NONBLOCK)); |
|
if (ret) { |
|
kfree_skb(skb); |
|
return ret; |
|
} |
|
|
|
return count; |
|
} |
|
|
|
static __poll_t wwan_port_fops_poll(struct file *filp, poll_table *wait) |
|
{ |
|
struct wwan_port *port = filp->private_data; |
|
__poll_t mask = 0; |
|
|
|
poll_wait(filp, &port->waitqueue, wait); |
|
|
|
mutex_lock(&port->ops_lock); |
|
if (port->ops && port->ops->tx_poll) |
|
mask |= port->ops->tx_poll(port, filp, wait); |
|
else if (!is_write_blocked(port)) |
|
mask |= EPOLLOUT | EPOLLWRNORM; |
|
if (!is_read_blocked(port)) |
|
mask |= EPOLLIN | EPOLLRDNORM; |
|
if (!port->ops) |
|
mask |= EPOLLHUP | EPOLLERR; |
|
mutex_unlock(&port->ops_lock); |
|
|
|
return mask; |
|
} |
|
|
|
/* Implements minimalistic stub terminal IOCTLs support */ |
|
static long wwan_port_fops_at_ioctl(struct wwan_port *port, unsigned int cmd, |
|
unsigned long arg) |
|
{ |
|
int ret = 0; |
|
|
|
mutex_lock(&port->data_lock); |
|
|
|
switch (cmd) { |
|
case TCFLSH: |
|
break; |
|
|
|
case TCGETS: |
|
if (copy_to_user((void __user *)arg, &port->at_data.termios, |
|
sizeof(struct termios))) |
|
ret = -EFAULT; |
|
break; |
|
|
|
case TCSETS: |
|
case TCSETSW: |
|
case TCSETSF: |
|
if (copy_from_user(&port->at_data.termios, (void __user *)arg, |
|
sizeof(struct termios))) |
|
ret = -EFAULT; |
|
break; |
|
|
|
#ifdef TCGETS2 |
|
case TCGETS2: |
|
if (copy_to_user((void __user *)arg, &port->at_data.termios, |
|
sizeof(struct termios2))) |
|
ret = -EFAULT; |
|
break; |
|
|
|
case TCSETS2: |
|
case TCSETSW2: |
|
case TCSETSF2: |
|
if (copy_from_user(&port->at_data.termios, (void __user *)arg, |
|
sizeof(struct termios2))) |
|
ret = -EFAULT; |
|
break; |
|
#endif |
|
|
|
case TIOCMGET: |
|
ret = put_user(port->at_data.mdmbits, (int __user *)arg); |
|
break; |
|
|
|
case TIOCMSET: |
|
case TIOCMBIC: |
|
case TIOCMBIS: { |
|
int mdmbits; |
|
|
|
if (copy_from_user(&mdmbits, (int __user *)arg, sizeof(int))) { |
|
ret = -EFAULT; |
|
break; |
|
} |
|
if (cmd == TIOCMBIC) |
|
port->at_data.mdmbits &= ~mdmbits; |
|
else if (cmd == TIOCMBIS) |
|
port->at_data.mdmbits |= mdmbits; |
|
else |
|
port->at_data.mdmbits = mdmbits; |
|
break; |
|
} |
|
|
|
default: |
|
ret = -ENOIOCTLCMD; |
|
} |
|
|
|
mutex_unlock(&port->data_lock); |
|
|
|
return ret; |
|
} |
|
|
|
static long wwan_port_fops_ioctl(struct file *filp, unsigned int cmd, |
|
unsigned long arg) |
|
{ |
|
struct wwan_port *port = filp->private_data; |
|
int res; |
|
|
|
if (port->type == WWAN_PORT_AT) { /* AT port specific IOCTLs */ |
|
res = wwan_port_fops_at_ioctl(port, cmd, arg); |
|
if (res != -ENOIOCTLCMD) |
|
return res; |
|
} |
|
|
|
switch (cmd) { |
|
case TIOCINQ: { /* aka SIOCINQ aka FIONREAD */ |
|
unsigned long flags; |
|
struct sk_buff *skb; |
|
int amount = 0; |
|
|
|
spin_lock_irqsave(&port->rxq.lock, flags); |
|
skb_queue_walk(&port->rxq, skb) |
|
amount += skb->len; |
|
spin_unlock_irqrestore(&port->rxq.lock, flags); |
|
|
|
return put_user(amount, (int __user *)arg); |
|
} |
|
|
|
default: |
|
return -ENOIOCTLCMD; |
|
} |
|
} |
|
|
|
static const struct file_operations wwan_port_fops = { |
|
.owner = THIS_MODULE, |
|
.open = wwan_port_fops_open, |
|
.release = wwan_port_fops_release, |
|
.read = wwan_port_fops_read, |
|
.write = wwan_port_fops_write, |
|
.poll = wwan_port_fops_poll, |
|
.unlocked_ioctl = wwan_port_fops_ioctl, |
|
#ifdef CONFIG_COMPAT |
|
.compat_ioctl = compat_ptr_ioctl, |
|
#endif |
|
.llseek = noop_llseek, |
|
}; |
|
|
|
static int wwan_rtnl_validate(struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
if (!data) |
|
return -EINVAL; |
|
|
|
if (!tb[IFLA_PARENT_DEV_NAME]) |
|
return -EINVAL; |
|
|
|
if (!data[IFLA_WWAN_LINK_ID]) |
|
return -EINVAL; |
|
|
|
return 0; |
|
} |
|
|
|
static struct device_type wwan_type = { .name = "wwan" }; |
|
|
|
static struct net_device *wwan_rtnl_alloc(struct nlattr *tb[], |
|
const char *ifname, |
|
unsigned char name_assign_type, |
|
unsigned int num_tx_queues, |
|
unsigned int num_rx_queues) |
|
{ |
|
const char *devname = nla_data(tb[IFLA_PARENT_DEV_NAME]); |
|
struct wwan_device *wwandev = wwan_dev_get_by_name(devname); |
|
struct net_device *dev; |
|
unsigned int priv_size; |
|
|
|
if (IS_ERR(wwandev)) |
|
return ERR_CAST(wwandev); |
|
|
|
/* only supported if ops were registered (not just ports) */ |
|
if (!wwandev->ops) { |
|
dev = ERR_PTR(-EOPNOTSUPP); |
|
goto out; |
|
} |
|
|
|
priv_size = sizeof(struct wwan_netdev_priv) + wwandev->ops->priv_size; |
|
dev = alloc_netdev_mqs(priv_size, ifname, name_assign_type, |
|
wwandev->ops->setup, num_tx_queues, num_rx_queues); |
|
|
|
if (dev) { |
|
SET_NETDEV_DEV(dev, &wwandev->dev); |
|
SET_NETDEV_DEVTYPE(dev, &wwan_type); |
|
} |
|
|
|
out: |
|
/* release the reference */ |
|
put_device(&wwandev->dev); |
|
return dev; |
|
} |
|
|
|
static int wwan_rtnl_newlink(struct net *src_net, struct net_device *dev, |
|
struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct wwan_device *wwandev = wwan_dev_get_by_parent(dev->dev.parent); |
|
u32 link_id = nla_get_u32(data[IFLA_WWAN_LINK_ID]); |
|
struct wwan_netdev_priv *priv = netdev_priv(dev); |
|
int ret; |
|
|
|
if (IS_ERR(wwandev)) |
|
return PTR_ERR(wwandev); |
|
|
|
/* shouldn't have a netdev (left) with us as parent so WARN */ |
|
if (WARN_ON(!wwandev->ops)) { |
|
ret = -EOPNOTSUPP; |
|
goto out; |
|
} |
|
|
|
priv->link_id = link_id; |
|
if (wwandev->ops->newlink) |
|
ret = wwandev->ops->newlink(wwandev->ops_ctxt, dev, |
|
link_id, extack); |
|
else |
|
ret = register_netdevice(dev); |
|
|
|
out: |
|
/* release the reference */ |
|
put_device(&wwandev->dev); |
|
return ret; |
|
} |
|
|
|
static void wwan_rtnl_dellink(struct net_device *dev, struct list_head *head) |
|
{ |
|
struct wwan_device *wwandev = wwan_dev_get_by_parent(dev->dev.parent); |
|
|
|
if (IS_ERR(wwandev)) |
|
return; |
|
|
|
/* shouldn't have a netdev (left) with us as parent so WARN */ |
|
if (WARN_ON(!wwandev->ops)) |
|
goto out; |
|
|
|
if (wwandev->ops->dellink) |
|
wwandev->ops->dellink(wwandev->ops_ctxt, dev, head); |
|
else |
|
unregister_netdevice_queue(dev, head); |
|
|
|
out: |
|
/* release the reference */ |
|
put_device(&wwandev->dev); |
|
} |
|
|
|
static size_t wwan_rtnl_get_size(const struct net_device *dev) |
|
{ |
|
return |
|
nla_total_size(4) + /* IFLA_WWAN_LINK_ID */ |
|
0; |
|
} |
|
|
|
static int wwan_rtnl_fill_info(struct sk_buff *skb, |
|
const struct net_device *dev) |
|
{ |
|
struct wwan_netdev_priv *priv = netdev_priv(dev); |
|
|
|
if (nla_put_u32(skb, IFLA_WWAN_LINK_ID, priv->link_id)) |
|
goto nla_put_failure; |
|
|
|
return 0; |
|
|
|
nla_put_failure: |
|
return -EMSGSIZE; |
|
} |
|
|
|
static const struct nla_policy wwan_rtnl_policy[IFLA_WWAN_MAX + 1] = { |
|
[IFLA_WWAN_LINK_ID] = { .type = NLA_U32 }, |
|
}; |
|
|
|
static struct rtnl_link_ops wwan_rtnl_link_ops __read_mostly = { |
|
.kind = "wwan", |
|
.maxtype = __IFLA_WWAN_MAX, |
|
.alloc = wwan_rtnl_alloc, |
|
.validate = wwan_rtnl_validate, |
|
.newlink = wwan_rtnl_newlink, |
|
.dellink = wwan_rtnl_dellink, |
|
.get_size = wwan_rtnl_get_size, |
|
.fill_info = wwan_rtnl_fill_info, |
|
.policy = wwan_rtnl_policy, |
|
}; |
|
|
|
static void wwan_create_default_link(struct wwan_device *wwandev, |
|
u32 def_link_id) |
|
{ |
|
struct nlattr *tb[IFLA_MAX + 1], *linkinfo[IFLA_INFO_MAX + 1]; |
|
struct nlattr *data[IFLA_WWAN_MAX + 1]; |
|
struct net_device *dev; |
|
struct nlmsghdr *nlh; |
|
struct sk_buff *msg; |
|
|
|
/* Forge attributes required to create a WWAN netdev. We first |
|
* build a netlink message and then parse it. This looks |
|
* odd, but such approach is less error prone. |
|
*/ |
|
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
|
if (WARN_ON(!msg)) |
|
return; |
|
nlh = nlmsg_put(msg, 0, 0, RTM_NEWLINK, 0, 0); |
|
if (WARN_ON(!nlh)) |
|
goto free_attrs; |
|
|
|
if (nla_put_string(msg, IFLA_PARENT_DEV_NAME, dev_name(&wwandev->dev))) |
|
goto free_attrs; |
|
tb[IFLA_LINKINFO] = nla_nest_start(msg, IFLA_LINKINFO); |
|
if (!tb[IFLA_LINKINFO]) |
|
goto free_attrs; |
|
linkinfo[IFLA_INFO_DATA] = nla_nest_start(msg, IFLA_INFO_DATA); |
|
if (!linkinfo[IFLA_INFO_DATA]) |
|
goto free_attrs; |
|
if (nla_put_u32(msg, IFLA_WWAN_LINK_ID, def_link_id)) |
|
goto free_attrs; |
|
nla_nest_end(msg, linkinfo[IFLA_INFO_DATA]); |
|
nla_nest_end(msg, tb[IFLA_LINKINFO]); |
|
|
|
nlmsg_end(msg, nlh); |
|
|
|
/* The next three parsing calls can not fail */ |
|
nlmsg_parse_deprecated(nlh, 0, tb, IFLA_MAX, NULL, NULL); |
|
nla_parse_nested_deprecated(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO], |
|
NULL, NULL); |
|
nla_parse_nested_deprecated(data, IFLA_WWAN_MAX, |
|
linkinfo[IFLA_INFO_DATA], NULL, NULL); |
|
|
|
rtnl_lock(); |
|
|
|
dev = rtnl_create_link(&init_net, "wwan%d", NET_NAME_ENUM, |
|
&wwan_rtnl_link_ops, tb, NULL); |
|
if (WARN_ON(IS_ERR(dev))) |
|
goto unlock; |
|
|
|
if (WARN_ON(wwan_rtnl_newlink(&init_net, dev, tb, data, NULL))) { |
|
free_netdev(dev); |
|
goto unlock; |
|
} |
|
|
|
rtnl_configure_link(dev, NULL); /* Link initialized, notify new link */ |
|
|
|
unlock: |
|
rtnl_unlock(); |
|
|
|
free_attrs: |
|
nlmsg_free(msg); |
|
} |
|
|
|
/** |
|
* wwan_register_ops - register WWAN device ops |
|
* @parent: Device to use as parent and shared by all WWAN ports and |
|
* created netdevs |
|
* @ops: operations to register |
|
* @ctxt: context to pass to operations |
|
* @def_link_id: id of the default link that will be automatically created by |
|
* the WWAN core for the WWAN device. The default link will not be created |
|
* if the passed value is WWAN_NO_DEFAULT_LINK. |
|
* |
|
* Returns: 0 on success, a negative error code on failure |
|
*/ |
|
int wwan_register_ops(struct device *parent, const struct wwan_ops *ops, |
|
void *ctxt, u32 def_link_id) |
|
{ |
|
struct wwan_device *wwandev; |
|
|
|
if (WARN_ON(!parent || !ops || !ops->setup)) |
|
return -EINVAL; |
|
|
|
wwandev = wwan_create_dev(parent); |
|
if (IS_ERR(wwandev)) |
|
return PTR_ERR(wwandev); |
|
|
|
if (WARN_ON(wwandev->ops)) { |
|
wwan_remove_dev(wwandev); |
|
return -EBUSY; |
|
} |
|
|
|
wwandev->ops = ops; |
|
wwandev->ops_ctxt = ctxt; |
|
|
|
/* NB: we do not abort ops registration in case of default link |
|
* creation failure. Link ops is the management interface, while the |
|
* default link creation is a service option. And we should not prevent |
|
* a user from manually creating a link latter if service option failed |
|
* now. |
|
*/ |
|
if (def_link_id != WWAN_NO_DEFAULT_LINK) |
|
wwan_create_default_link(wwandev, def_link_id); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(wwan_register_ops); |
|
|
|
/* Enqueue child netdev deletion */ |
|
static int wwan_child_dellink(struct device *dev, void *data) |
|
{ |
|
struct list_head *kill_list = data; |
|
|
|
if (dev->type == &wwan_type) |
|
wwan_rtnl_dellink(to_net_dev(dev), kill_list); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* wwan_unregister_ops - remove WWAN device ops |
|
* @parent: Device to use as parent and shared by all WWAN ports and |
|
* created netdevs |
|
*/ |
|
void wwan_unregister_ops(struct device *parent) |
|
{ |
|
struct wwan_device *wwandev = wwan_dev_get_by_parent(parent); |
|
LIST_HEAD(kill_list); |
|
|
|
if (WARN_ON(IS_ERR(wwandev))) |
|
return; |
|
if (WARN_ON(!wwandev->ops)) { |
|
put_device(&wwandev->dev); |
|
return; |
|
} |
|
|
|
/* put the reference obtained by wwan_dev_get_by_parent(), |
|
* we should still have one (that the owner is giving back |
|
* now) due to the ops being assigned. |
|
*/ |
|
put_device(&wwandev->dev); |
|
|
|
rtnl_lock(); /* Prevent concurent netdev(s) creation/destroying */ |
|
|
|
/* Remove all child netdev(s), using batch removing */ |
|
device_for_each_child(&wwandev->dev, &kill_list, |
|
wwan_child_dellink); |
|
unregister_netdevice_many(&kill_list); |
|
|
|
wwandev->ops = NULL; /* Finally remove ops */ |
|
|
|
rtnl_unlock(); |
|
|
|
wwandev->ops_ctxt = NULL; |
|
wwan_remove_dev(wwandev); |
|
} |
|
EXPORT_SYMBOL_GPL(wwan_unregister_ops); |
|
|
|
static int __init wwan_init(void) |
|
{ |
|
int err; |
|
|
|
err = rtnl_link_register(&wwan_rtnl_link_ops); |
|
if (err) |
|
return err; |
|
|
|
wwan_class = class_create(THIS_MODULE, "wwan"); |
|
if (IS_ERR(wwan_class)) { |
|
err = PTR_ERR(wwan_class); |
|
goto unregister; |
|
} |
|
|
|
/* chrdev used for wwan ports */ |
|
wwan_major = __register_chrdev(0, 0, WWAN_MAX_MINORS, "wwan_port", |
|
&wwan_port_fops); |
|
if (wwan_major < 0) { |
|
err = wwan_major; |
|
goto destroy; |
|
} |
|
|
|
return 0; |
|
|
|
destroy: |
|
class_destroy(wwan_class); |
|
unregister: |
|
rtnl_link_unregister(&wwan_rtnl_link_ops); |
|
return err; |
|
} |
|
|
|
static void __exit wwan_exit(void) |
|
{ |
|
__unregister_chrdev(wwan_major, 0, WWAN_MAX_MINORS, "wwan_port"); |
|
rtnl_link_unregister(&wwan_rtnl_link_ops); |
|
class_destroy(wwan_class); |
|
} |
|
|
|
module_init(wwan_init); |
|
module_exit(wwan_exit); |
|
|
|
MODULE_AUTHOR("Loic Poulain <[email protected]>"); |
|
MODULE_DESCRIPTION("WWAN core"); |
|
MODULE_LICENSE("GPL v2");
|
|
|