2 * Gadget Function Driver for Android USB accessories
4 * Copyright (C) 2011 Google, Inc.
5 * Author: Mike Lockwood <lockwood@android.com>
7 * This software is licensed under the terms of the GNU General Public
8 * License version 2, as published by the Free Software Foundation, and
9 * may be copied, distributed, and modified under those terms.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
19 /* #define VERBOSE_DEBUG */
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/poll.h>
24 #include <linux/delay.h>
25 #include <linux/wait.h>
26 #include <linux/err.h>
27 #include <linux/interrupt.h>
28 #include <linux/kthread.h>
29 #include <linux/freezer.h>
31 #include <linux/types.h>
32 #include <linux/file.h>
33 #include <linux/device.h>
34 #include <linux/miscdevice.h>
36 #include <linux/hid.h>
37 #include <linux/hiddev.h>
38 #include <linux/usb.h>
39 #include <linux/usb/ch9.h>
40 #include <linux/usb/f_accessory.h>
42 #define BULK_BUFFER_SIZE 16384
43 #define ACC_STRING_SIZE 256
45 #define PROTOCOL_VERSION 2
48 #define INTERFACE_STRING_INDEX 0
50 /* number of tx and rx requests to allocate */
55 struct list_head list;
56 struct hid_device *hid;
58 /* accessory defined ID */
60 /* HID report descriptor */
62 /* length of HID report descriptor */
64 /* number of bytes of report_desc we have received so far */
65 int report_desc_offset;
69 struct usb_function function;
70 struct usb_composite_dev *cdev;
74 struct usb_ep *ep_out;
76 /* set to 1 when we connect */
78 /* Set to 1 when we disconnect.
79 * Not cleared until our file is closed.
83 /* strings sent by the host */
84 char manufacturer[ACC_STRING_SIZE];
85 char model[ACC_STRING_SIZE];
86 char description[ACC_STRING_SIZE];
87 char version[ACC_STRING_SIZE];
88 char uri[ACC_STRING_SIZE];
89 char serial[ACC_STRING_SIZE];
91 /* for acc_complete_set_string */
94 /* set to 1 if we have a pending start request */
99 /* synchronize access to our device file */
102 struct list_head tx_idle;
104 wait_queue_head_t read_wq;
105 wait_queue_head_t write_wq;
106 struct usb_request *rx_req[RX_REQ_MAX];
109 /* delayed work for handling ACCESSORY_START */
110 struct delayed_work start_work;
112 /* worker for registering and unregistering hid devices */
113 struct work_struct hid_work;
115 /* list of active HID devices */
116 struct list_head hid_list;
118 /* list of new HID devices to register */
119 struct list_head new_hid_list;
121 /* list of dead HID devices to unregister */
122 struct list_head dead_hid_list;
125 static struct usb_interface_descriptor acc_interface_desc = {
126 .bLength = USB_DT_INTERFACE_SIZE,
127 .bDescriptorType = USB_DT_INTERFACE,
128 .bInterfaceNumber = 0,
130 .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
131 .bInterfaceSubClass = USB_SUBCLASS_VENDOR_SPEC,
132 .bInterfaceProtocol = 0,
135 static struct usb_endpoint_descriptor acc_highspeed_in_desc = {
136 .bLength = USB_DT_ENDPOINT_SIZE,
137 .bDescriptorType = USB_DT_ENDPOINT,
138 .bEndpointAddress = USB_DIR_IN,
139 .bmAttributes = USB_ENDPOINT_XFER_BULK,
140 .wMaxPacketSize = __constant_cpu_to_le16(512),
143 static struct usb_endpoint_descriptor acc_highspeed_out_desc = {
144 .bLength = USB_DT_ENDPOINT_SIZE,
145 .bDescriptorType = USB_DT_ENDPOINT,
146 .bEndpointAddress = USB_DIR_OUT,
147 .bmAttributes = USB_ENDPOINT_XFER_BULK,
148 .wMaxPacketSize = __constant_cpu_to_le16(512),
151 static struct usb_endpoint_descriptor acc_fullspeed_in_desc = {
152 .bLength = USB_DT_ENDPOINT_SIZE,
153 .bDescriptorType = USB_DT_ENDPOINT,
154 .bEndpointAddress = USB_DIR_IN,
155 .bmAttributes = USB_ENDPOINT_XFER_BULK,
158 static struct usb_endpoint_descriptor acc_fullspeed_out_desc = {
159 .bLength = USB_DT_ENDPOINT_SIZE,
160 .bDescriptorType = USB_DT_ENDPOINT,
161 .bEndpointAddress = USB_DIR_OUT,
162 .bmAttributes = USB_ENDPOINT_XFER_BULK,
165 static struct usb_descriptor_header *fs_acc_descs[] = {
166 (struct usb_descriptor_header *) &acc_interface_desc,
167 (struct usb_descriptor_header *) &acc_fullspeed_in_desc,
168 (struct usb_descriptor_header *) &acc_fullspeed_out_desc,
172 static struct usb_descriptor_header *hs_acc_descs[] = {
173 (struct usb_descriptor_header *) &acc_interface_desc,
174 (struct usb_descriptor_header *) &acc_highspeed_in_desc,
175 (struct usb_descriptor_header *) &acc_highspeed_out_desc,
179 static struct usb_string acc_string_defs[] = {
180 [INTERFACE_STRING_INDEX].s = "Android Accessory Interface",
181 { }, /* end of list */
184 static struct usb_gadget_strings acc_string_table = {
185 .language = 0x0409, /* en-US */
186 .strings = acc_string_defs,
189 static struct usb_gadget_strings *acc_strings[] = {
194 /* temporary variable used between acc_open() and acc_gadget_bind() */
195 static struct acc_dev *_acc_dev;
197 static inline struct acc_dev *func_to_dev(struct usb_function *f)
199 return container_of(f, struct acc_dev, function);
202 static struct usb_request *acc_request_new(struct usb_ep *ep, int buffer_size)
204 struct usb_request *req = usb_ep_alloc_request(ep, GFP_KERNEL);
208 /* now allocate buffers for the requests */
209 req->buf = kmalloc(buffer_size, GFP_KERNEL);
211 usb_ep_free_request(ep, req);
218 static void acc_request_free(struct usb_request *req, struct usb_ep *ep)
222 usb_ep_free_request(ep, req);
226 /* add a request to the tail of a list */
227 static void req_put(struct acc_dev *dev, struct list_head *head,
228 struct usb_request *req)
232 spin_lock_irqsave(&dev->lock, flags);
233 list_add_tail(&req->list, head);
234 spin_unlock_irqrestore(&dev->lock, flags);
237 /* remove a request from the head of a list */
238 static struct usb_request *req_get(struct acc_dev *dev, struct list_head *head)
241 struct usb_request *req;
243 spin_lock_irqsave(&dev->lock, flags);
244 if (list_empty(head)) {
247 req = list_first_entry(head, struct usb_request, list);
248 list_del(&req->list);
250 spin_unlock_irqrestore(&dev->lock, flags);
254 static void acc_set_disconnected(struct acc_dev *dev)
257 dev->disconnected = 1;
260 static void acc_complete_in(struct usb_ep *ep, struct usb_request *req)
262 struct acc_dev *dev = _acc_dev;
264 if (req->status == -ESHUTDOWN) {
265 pr_debug("acc_complete_in set disconnected");
266 acc_set_disconnected(dev);
269 req_put(dev, &dev->tx_idle, req);
271 wake_up(&dev->write_wq);
274 static void acc_complete_out(struct usb_ep *ep, struct usb_request *req)
276 struct acc_dev *dev = _acc_dev;
279 if (req->status == -ESHUTDOWN) {
280 pr_debug("acc_complete_out set disconnected");
281 acc_set_disconnected(dev);
284 wake_up(&dev->read_wq);
287 static void acc_complete_set_string(struct usb_ep *ep, struct usb_request *req)
289 struct acc_dev *dev = ep->driver_data;
290 char *string_dest = NULL;
291 int length = req->actual;
293 if (req->status != 0) {
294 pr_err("acc_complete_set_string, err %d\n", req->status);
298 switch (dev->string_index) {
299 case ACCESSORY_STRING_MANUFACTURER:
300 string_dest = dev->manufacturer;
302 case ACCESSORY_STRING_MODEL:
303 string_dest = dev->model;
305 case ACCESSORY_STRING_DESCRIPTION:
306 string_dest = dev->description;
308 case ACCESSORY_STRING_VERSION:
309 string_dest = dev->version;
311 case ACCESSORY_STRING_URI:
312 string_dest = dev->uri;
314 case ACCESSORY_STRING_SERIAL:
315 string_dest = dev->serial;
321 if (length >= ACC_STRING_SIZE)
322 length = ACC_STRING_SIZE - 1;
324 spin_lock_irqsave(&dev->lock, flags);
325 memcpy(string_dest, req->buf, length);
326 /* ensure zero termination */
327 string_dest[length] = 0;
328 spin_unlock_irqrestore(&dev->lock, flags);
330 pr_err("unknown accessory string index %d\n",
335 static void acc_complete_set_hid_report_desc(struct usb_ep *ep,
336 struct usb_request *req)
338 struct acc_hid_dev *hid = req->context;
339 struct acc_dev *dev = hid->dev;
340 int length = req->actual;
342 if (req->status != 0) {
343 pr_err("acc_complete_set_hid_report_desc, err %d\n",
348 memcpy(hid->report_desc + hid->report_desc_offset, req->buf, length);
349 hid->report_desc_offset += length;
350 if (hid->report_desc_offset == hid->report_desc_len) {
351 /* After we have received the entire report descriptor
352 * we schedule work to initialize the HID device
354 schedule_work(&dev->hid_work);
358 static void acc_complete_send_hid_event(struct usb_ep *ep,
359 struct usb_request *req)
361 struct acc_hid_dev *hid = req->context;
362 int length = req->actual;
364 if (req->status != 0) {
365 pr_err("acc_complete_send_hid_event, err %d\n", req->status);
369 hid_report_raw_event(hid->hid, HID_INPUT_REPORT, req->buf, length, 1);
372 static int acc_hid_parse(struct hid_device *hid)
374 struct acc_hid_dev *hdev = hid->driver_data;
376 hid_parse_report(hid, hdev->report_desc, hdev->report_desc_len);
380 static int acc_hid_start(struct hid_device *hid)
385 static void acc_hid_stop(struct hid_device *hid)
389 static int acc_hid_open(struct hid_device *hid)
394 static void acc_hid_close(struct hid_device *hid)
398 static struct hid_ll_driver acc_hid_ll_driver = {
399 .parse = acc_hid_parse,
400 .start = acc_hid_start,
401 .stop = acc_hid_stop,
402 .open = acc_hid_open,
403 .close = acc_hid_close,
406 static struct acc_hid_dev *acc_hid_new(struct acc_dev *dev,
407 int id, int desc_len)
409 struct acc_hid_dev *hdev;
411 hdev = kzalloc(sizeof(*hdev), GFP_ATOMIC);
414 hdev->report_desc = kzalloc(desc_len, GFP_ATOMIC);
415 if (!hdev->report_desc) {
421 hdev->report_desc_len = desc_len;
426 static struct acc_hid_dev *acc_hid_get(struct list_head *list, int id)
428 struct acc_hid_dev *hid;
430 list_for_each_entry(hid, list, list) {
437 static int acc_register_hid(struct acc_dev *dev, int id, int desc_length)
439 struct acc_hid_dev *hid;
442 /* report descriptor length must be > 0 */
443 if (desc_length <= 0)
446 spin_lock_irqsave(&dev->lock, flags);
447 /* replace HID if one already exists with this ID */
448 hid = acc_hid_get(&dev->hid_list, id);
450 hid = acc_hid_get(&dev->new_hid_list, id);
452 list_move(&hid->list, &dev->dead_hid_list);
454 hid = acc_hid_new(dev, id, desc_length);
456 spin_unlock_irqrestore(&dev->lock, flags);
460 list_add(&hid->list, &dev->new_hid_list);
461 spin_unlock_irqrestore(&dev->lock, flags);
463 /* schedule work to register the HID device */
464 schedule_work(&dev->hid_work);
468 static int acc_unregister_hid(struct acc_dev *dev, int id)
470 struct acc_hid_dev *hid;
473 spin_lock_irqsave(&dev->lock, flags);
474 hid = acc_hid_get(&dev->hid_list, id);
476 hid = acc_hid_get(&dev->new_hid_list, id);
478 spin_unlock_irqrestore(&dev->lock, flags);
482 list_move(&hid->list, &dev->dead_hid_list);
483 spin_unlock_irqrestore(&dev->lock, flags);
485 schedule_work(&dev->hid_work);
489 static int create_bulk_endpoints(struct acc_dev *dev,
490 struct usb_endpoint_descriptor *in_desc,
491 struct usb_endpoint_descriptor *out_desc)
493 struct usb_composite_dev *cdev = dev->cdev;
494 struct usb_request *req;
498 DBG(cdev, "create_bulk_endpoints dev: %p\n", dev);
500 ep = usb_ep_autoconfig(cdev->gadget, in_desc);
502 DBG(cdev, "usb_ep_autoconfig for ep_in failed\n");
505 DBG(cdev, "usb_ep_autoconfig for ep_in got %s\n", ep->name);
506 ep->driver_data = dev; /* claim the endpoint */
509 ep = usb_ep_autoconfig(cdev->gadget, out_desc);
511 DBG(cdev, "usb_ep_autoconfig for ep_out failed\n");
514 DBG(cdev, "usb_ep_autoconfig for ep_out got %s\n", ep->name);
515 ep->driver_data = dev; /* claim the endpoint */
518 ep = usb_ep_autoconfig(cdev->gadget, out_desc);
520 DBG(cdev, "usb_ep_autoconfig for ep_out failed\n");
523 DBG(cdev, "usb_ep_autoconfig for ep_out got %s\n", ep->name);
524 ep->driver_data = dev; /* claim the endpoint */
527 /* now allocate requests for our endpoints */
528 for (i = 0; i < TX_REQ_MAX; i++) {
529 req = acc_request_new(dev->ep_in, BULK_BUFFER_SIZE);
532 req->complete = acc_complete_in;
533 req_put(dev, &dev->tx_idle, req);
535 for (i = 0; i < RX_REQ_MAX; i++) {
536 req = acc_request_new(dev->ep_out, BULK_BUFFER_SIZE);
539 req->complete = acc_complete_out;
540 dev->rx_req[i] = req;
546 pr_err("acc_bind() could not allocate requests\n");
547 while ((req = req_get(dev, &dev->tx_idle)))
548 acc_request_free(req, dev->ep_in);
549 for (i = 0; i < RX_REQ_MAX; i++)
550 acc_request_free(dev->rx_req[i], dev->ep_out);
554 static ssize_t acc_read(struct file *fp, char __user *buf,
555 size_t count, loff_t *pos)
557 struct acc_dev *dev = fp->private_data;
558 struct usb_request *req;
563 pr_debug("acc_read(%zu)\n", count);
565 if (dev->disconnected) {
566 pr_debug("acc_read disconnected");
570 if (count > BULK_BUFFER_SIZE)
571 count = BULK_BUFFER_SIZE;
573 /* we will block until we're online */
574 pr_debug("acc_read: waiting for online\n");
575 ret = wait_event_interruptible(dev->read_wq, dev->online);
582 // last req cancelled. try to get it.
583 req = dev->rx_req[0];
588 /* queue a request */
589 req = dev->rx_req[0];
592 ret = usb_ep_queue(dev->ep_out, req, GFP_KERNEL);
597 pr_debug("rx %p queue\n", req);
600 /* wait for a request to complete */
601 ret = wait_event_interruptible(dev->read_wq, dev->rx_done);
604 ret = usb_ep_dequeue(dev->ep_out, req);
606 // cancel failed. There can be a data already received.
607 // it will be retrieved in the next read.
608 pr_debug("acc_read: cancelling failed %d", ret);
616 /* If we got a 0-len packet, throw it back and try again. */
617 if (req->actual == 0)
620 pr_debug("rx %p %u\n", req, req->actual);
621 xfer = (req->actual < count) ? req->actual : count;
623 if (copy_to_user(buf, req->buf, xfer))
629 pr_debug("acc_read returning %zd\n", r);
633 static ssize_t acc_write(struct file *fp, const char __user *buf,
634 size_t count, loff_t *pos)
636 struct acc_dev *dev = fp->private_data;
637 struct usb_request *req = 0;
642 pr_debug("acc_write(%zu)\n", count);
644 if (!dev->online || dev->disconnected) {
645 pr_debug("acc_write disconnected or not online");
651 pr_debug("acc_write dev->error\n");
656 /* get an idle tx request to use */
658 ret = wait_event_interruptible(dev->write_wq,
659 ((req = req_get(dev, &dev->tx_idle)) || !dev->online));
665 if (count > BULK_BUFFER_SIZE)
666 xfer = BULK_BUFFER_SIZE;
669 if (copy_from_user(req->buf, buf, xfer)) {
675 ret = usb_ep_queue(dev->ep_in, req, GFP_KERNEL);
677 pr_debug("acc_write: xfer error %d\n", ret);
685 /* zero this so we don't try to free it on error exit */
690 req_put(dev, &dev->tx_idle, req);
692 pr_debug("acc_write returning %zd\n", r);
696 static long acc_ioctl(struct file *fp, unsigned code, unsigned long value)
698 struct acc_dev *dev = fp->private_data;
703 case ACCESSORY_GET_STRING_MANUFACTURER:
704 src = dev->manufacturer;
706 case ACCESSORY_GET_STRING_MODEL:
709 case ACCESSORY_GET_STRING_DESCRIPTION:
710 src = dev->description;
712 case ACCESSORY_GET_STRING_VERSION:
715 case ACCESSORY_GET_STRING_URI:
718 case ACCESSORY_GET_STRING_SERIAL:
721 case ACCESSORY_IS_START_REQUESTED:
722 return dev->start_requested;
723 case ACCESSORY_GET_AUDIO_MODE:
724 return dev->audio_mode;
729 ret = strlen(src) + 1;
730 if (copy_to_user((void __user *)value, src, ret))
735 static int acc_open(struct inode *ip, struct file *fp)
737 printk(KERN_INFO "acc_open\n");
738 if (atomic_xchg(&_acc_dev->open_excl, 1))
741 _acc_dev->disconnected = 0;
742 fp->private_data = _acc_dev;
746 static int acc_release(struct inode *ip, struct file *fp)
748 printk(KERN_INFO "acc_release\n");
750 WARN_ON(!atomic_xchg(&_acc_dev->open_excl, 0));
751 _acc_dev->disconnected = 0;
755 /* file operations for /dev/usb_accessory */
756 static const struct file_operations acc_fops = {
757 .owner = THIS_MODULE,
760 .unlocked_ioctl = acc_ioctl,
762 .release = acc_release,
765 static int acc_hid_probe(struct hid_device *hdev,
766 const struct hid_device_id *id)
770 ret = hid_parse(hdev);
773 return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
776 static struct miscdevice acc_device = {
777 .minor = MISC_DYNAMIC_MINOR,
778 .name = "usb_accessory",
782 static const struct hid_device_id acc_hid_table[] = {
783 { HID_USB_DEVICE(HID_ANY_ID, HID_ANY_ID) },
787 static struct hid_driver acc_hid_driver = {
788 .name = "USB accessory",
789 .id_table = acc_hid_table,
790 .probe = acc_hid_probe,
793 static int acc_ctrlrequest(struct usb_composite_dev *cdev,
794 const struct usb_ctrlrequest *ctrl)
796 struct acc_dev *dev = _acc_dev;
797 int value = -EOPNOTSUPP;
798 struct acc_hid_dev *hid;
800 u8 b_requestType = ctrl->bRequestType;
801 u8 b_request = ctrl->bRequest;
802 u16 w_index = le16_to_cpu(ctrl->wIndex);
803 u16 w_value = le16_to_cpu(ctrl->wValue);
804 u16 w_length = le16_to_cpu(ctrl->wLength);
808 printk(KERN_INFO "acc_ctrlrequest "
809 "%02x.%02x v%04x i%04x l%u\n",
810 b_requestType, b_request,
811 w_value, w_index, w_length);
814 if (b_requestType == (USB_DIR_OUT | USB_TYPE_VENDOR)) {
815 if (b_request == ACCESSORY_START) {
816 dev->start_requested = 1;
817 schedule_delayed_work(
818 &dev->start_work, msecs_to_jiffies(10));
820 } else if (b_request == ACCESSORY_SEND_STRING) {
821 dev->string_index = w_index;
822 cdev->gadget->ep0->driver_data = dev;
823 cdev->req->complete = acc_complete_set_string;
825 } else if (b_request == ACCESSORY_SET_AUDIO_MODE &&
826 w_index == 0 && w_length == 0) {
827 dev->audio_mode = w_value;
829 } else if (b_request == ACCESSORY_REGISTER_HID) {
830 value = acc_register_hid(dev, w_value, w_index);
831 } else if (b_request == ACCESSORY_UNREGISTER_HID) {
832 value = acc_unregister_hid(dev, w_value);
833 } else if (b_request == ACCESSORY_SET_HID_REPORT_DESC) {
834 spin_lock_irqsave(&dev->lock, flags);
835 hid = acc_hid_get(&dev->new_hid_list, w_value);
836 spin_unlock_irqrestore(&dev->lock, flags);
842 if (offset != hid->report_desc_offset
843 || offset + w_length > hid->report_desc_len) {
847 cdev->req->context = hid;
848 cdev->req->complete = acc_complete_set_hid_report_desc;
850 } else if (b_request == ACCESSORY_SEND_HID_EVENT) {
851 spin_lock_irqsave(&dev->lock, flags);
852 hid = acc_hid_get(&dev->hid_list, w_value);
853 spin_unlock_irqrestore(&dev->lock, flags);
858 cdev->req->context = hid;
859 cdev->req->complete = acc_complete_send_hid_event;
862 } else if (b_requestType == (USB_DIR_IN | USB_TYPE_VENDOR)) {
863 if (b_request == ACCESSORY_GET_PROTOCOL) {
864 *((u16 *)cdev->req->buf) = PROTOCOL_VERSION;
867 /* clear any string left over from a previous session */
868 memset(dev->manufacturer, 0, sizeof(dev->manufacturer));
869 memset(dev->model, 0, sizeof(dev->model));
870 memset(dev->description, 0, sizeof(dev->description));
871 memset(dev->version, 0, sizeof(dev->version));
872 memset(dev->uri, 0, sizeof(dev->uri));
873 memset(dev->serial, 0, sizeof(dev->serial));
874 dev->start_requested = 0;
881 cdev->req->length = value;
882 value = usb_ep_queue(cdev->gadget->ep0, cdev->req, GFP_ATOMIC);
884 ERROR(cdev, "%s setup response queue error\n",
889 if (value == -EOPNOTSUPP)
891 "unknown class-specific control req "
892 "%02x.%02x v%04x i%04x l%u\n",
893 ctrl->bRequestType, ctrl->bRequest,
894 w_value, w_index, w_length);
899 acc_function_bind(struct usb_configuration *c, struct usb_function *f)
901 struct usb_composite_dev *cdev = c->cdev;
902 struct acc_dev *dev = func_to_dev(f);
906 DBG(cdev, "acc_function_bind dev: %p\n", dev);
908 ret = hid_register_driver(&acc_hid_driver);
912 dev->start_requested = 0;
914 /* allocate interface ID(s) */
915 id = usb_interface_id(c, f);
918 acc_interface_desc.bInterfaceNumber = id;
920 /* allocate endpoints */
921 ret = create_bulk_endpoints(dev, &acc_fullspeed_in_desc,
922 &acc_fullspeed_out_desc);
926 /* support high speed hardware */
927 if (gadget_is_dualspeed(c->cdev->gadget)) {
928 acc_highspeed_in_desc.bEndpointAddress =
929 acc_fullspeed_in_desc.bEndpointAddress;
930 acc_highspeed_out_desc.bEndpointAddress =
931 acc_fullspeed_out_desc.bEndpointAddress;
934 DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n",
935 gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
936 f->name, dev->ep_in->name, dev->ep_out->name);
941 kill_all_hid_devices(struct acc_dev *dev)
943 struct acc_hid_dev *hid;
944 struct list_head *entry, *temp;
947 spin_lock_irqsave(&dev->lock, flags);
948 list_for_each_safe(entry, temp, &dev->hid_list) {
949 hid = list_entry(entry, struct acc_hid_dev, list);
950 list_del(&hid->list);
951 list_add(&hid->list, &dev->dead_hid_list);
953 list_for_each_safe(entry, temp, &dev->new_hid_list) {
954 hid = list_entry(entry, struct acc_hid_dev, list);
955 list_del(&hid->list);
956 list_add(&hid->list, &dev->dead_hid_list);
958 spin_unlock_irqrestore(&dev->lock, flags);
960 schedule_work(&dev->hid_work);
964 acc_hid_unbind(struct acc_dev *dev)
966 hid_unregister_driver(&acc_hid_driver);
967 kill_all_hid_devices(dev);
971 acc_function_unbind(struct usb_configuration *c, struct usb_function *f)
973 struct acc_dev *dev = func_to_dev(f);
974 struct usb_request *req;
977 while ((req = req_get(dev, &dev->tx_idle)))
978 acc_request_free(req, dev->ep_in);
979 for (i = 0; i < RX_REQ_MAX; i++)
980 acc_request_free(dev->rx_req[i], dev->ep_out);
985 static void acc_start_work(struct work_struct *data)
987 char *envp[2] = { "ACCESSORY=START", NULL };
988 kobject_uevent_env(&acc_device.this_device->kobj, KOBJ_CHANGE, envp);
991 static int acc_hid_init(struct acc_hid_dev *hdev)
993 struct hid_device *hid;
996 hid = hid_allocate_device();
1000 hid->ll_driver = &acc_hid_ll_driver;
1001 hid->dev.parent = acc_device.this_device;
1004 hid->vendor = HID_ANY_ID;
1005 hid->product = HID_ANY_ID;
1006 hid->driver_data = hdev;
1007 ret = hid_add_device(hid);
1009 pr_err("can't add hid device: %d\n", ret);
1010 hid_destroy_device(hid);
1018 static void acc_hid_delete(struct acc_hid_dev *hid)
1020 kfree(hid->report_desc);
1024 static void acc_hid_work(struct work_struct *data)
1026 struct acc_dev *dev = _acc_dev;
1027 struct list_head *entry, *temp;
1028 struct acc_hid_dev *hid;
1029 struct list_head new_list, dead_list;
1030 unsigned long flags;
1032 INIT_LIST_HEAD(&new_list);
1034 spin_lock_irqsave(&dev->lock, flags);
1036 /* copy hids that are ready for initialization to new_list */
1037 list_for_each_safe(entry, temp, &dev->new_hid_list) {
1038 hid = list_entry(entry, struct acc_hid_dev, list);
1039 if (hid->report_desc_offset == hid->report_desc_len)
1040 list_move(&hid->list, &new_list);
1043 if (list_empty(&dev->dead_hid_list)) {
1044 INIT_LIST_HEAD(&dead_list);
1046 /* move all of dev->dead_hid_list to dead_list */
1047 dead_list.prev = dev->dead_hid_list.prev;
1048 dead_list.next = dev->dead_hid_list.next;
1049 dead_list.next->prev = &dead_list;
1050 dead_list.prev->next = &dead_list;
1051 INIT_LIST_HEAD(&dev->dead_hid_list);
1054 spin_unlock_irqrestore(&dev->lock, flags);
1056 /* register new HID devices */
1057 list_for_each_safe(entry, temp, &new_list) {
1058 hid = list_entry(entry, struct acc_hid_dev, list);
1059 if (acc_hid_init(hid)) {
1060 pr_err("can't add HID device %p\n", hid);
1061 acc_hid_delete(hid);
1063 spin_lock_irqsave(&dev->lock, flags);
1064 list_move(&hid->list, &dev->hid_list);
1065 spin_unlock_irqrestore(&dev->lock, flags);
1069 /* remove dead HID devices */
1070 list_for_each_safe(entry, temp, &dead_list) {
1071 hid = list_entry(entry, struct acc_hid_dev, list);
1072 list_del(&hid->list);
1074 hid_destroy_device(hid->hid);
1075 acc_hid_delete(hid);
1079 static int acc_function_set_alt(struct usb_function *f,
1080 unsigned intf, unsigned alt)
1082 struct acc_dev *dev = func_to_dev(f);
1083 struct usb_composite_dev *cdev = f->config->cdev;
1086 DBG(cdev, "acc_function_set_alt intf: %d alt: %d\n", intf, alt);
1088 ret = config_ep_by_speed(cdev->gadget, f, dev->ep_in);
1092 ret = usb_ep_enable(dev->ep_in);
1096 ret = config_ep_by_speed(cdev->gadget, f, dev->ep_out);
1100 ret = usb_ep_enable(dev->ep_out);
1102 usb_ep_disable(dev->ep_in);
1108 /* readers may be blocked waiting for us to go online */
1109 wake_up(&dev->read_wq);
1113 static void acc_function_disable(struct usb_function *f)
1115 struct acc_dev *dev = func_to_dev(f);
1116 struct usb_composite_dev *cdev = dev->cdev;
1118 DBG(cdev, "acc_function_disable\n");
1119 acc_set_disconnected(dev);
1120 usb_ep_disable(dev->ep_in);
1121 usb_ep_disable(dev->ep_out);
1123 /* readers may be blocked waiting for us to go online */
1124 wake_up(&dev->read_wq);
1126 VDBG(cdev, "%s disabled\n", dev->function.name);
1129 static int acc_bind_config(struct usb_configuration *c)
1131 struct acc_dev *dev = _acc_dev;
1134 printk(KERN_INFO "acc_bind_config\n");
1136 /* allocate a string ID for our interface */
1137 if (acc_string_defs[INTERFACE_STRING_INDEX].id == 0) {
1138 ret = usb_string_id(c->cdev);
1141 acc_string_defs[INTERFACE_STRING_INDEX].id = ret;
1142 acc_interface_desc.iInterface = ret;
1145 dev->cdev = c->cdev;
1146 dev->function.name = "accessory";
1147 dev->function.strings = acc_strings,
1148 dev->function.fs_descriptors = fs_acc_descs;
1149 dev->function.hs_descriptors = hs_acc_descs;
1150 dev->function.bind = acc_function_bind;
1151 dev->function.unbind = acc_function_unbind;
1152 dev->function.set_alt = acc_function_set_alt;
1153 dev->function.disable = acc_function_disable;
1155 return usb_add_function(c, &dev->function);
1158 static int acc_setup(void)
1160 struct acc_dev *dev;
1163 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1167 spin_lock_init(&dev->lock);
1168 init_waitqueue_head(&dev->read_wq);
1169 init_waitqueue_head(&dev->write_wq);
1170 atomic_set(&dev->open_excl, 0);
1171 INIT_LIST_HEAD(&dev->tx_idle);
1172 INIT_LIST_HEAD(&dev->hid_list);
1173 INIT_LIST_HEAD(&dev->new_hid_list);
1174 INIT_LIST_HEAD(&dev->dead_hid_list);
1175 INIT_DELAYED_WORK(&dev->start_work, acc_start_work);
1176 INIT_WORK(&dev->hid_work, acc_hid_work);
1178 /* _acc_dev must be set before calling usb_gadget_register_driver */
1181 ret = misc_register(&acc_device);
1189 pr_err("USB accessory gadget driver failed to initialize\n");
1193 static void acc_disconnect(void)
1195 /* unregister all HID devices if USB is disconnected */
1196 kill_all_hid_devices(_acc_dev);
1199 static void acc_cleanup(void)
1201 misc_deregister(&acc_device);