2 * f_hid.c -- USB HID function driver
4 * Copyright (C) 2010 Fabien Chouteau <fabien.chouteau@barco.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/hid.h>
15 #include <linux/idr.h>
16 #include <linux/cdev.h>
17 #include <linux/mutex.h>
18 #include <linux/poll.h>
19 #include <linux/uaccess.h>
20 #include <linux/wait.h>
21 #include <linux/sched.h>
22 #include <linux/usb/g_hid.h>
29 static int major
, minors
;
30 static struct class *hidg_class
;
31 static DEFINE_IDA(hidg_ida
);
32 static DEFINE_MUTEX(hidg_ida_lock
); /* protects access to hidg_ida */
34 /*-------------------------------------------------------------------------*/
35 /* HID gadget struct */
37 struct f_hidg_req_list
{
38 struct usb_request
*req
;
40 struct list_head list
;
45 unsigned char bInterfaceSubClass
;
46 unsigned char bInterfaceProtocol
;
47 unsigned short report_desc_length
;
49 unsigned short report_length
;
52 struct list_head completed_out_req
;
54 wait_queue_head_t read_queue
;
60 wait_queue_head_t write_queue
;
61 struct usb_request
*req
;
65 struct usb_function func
;
68 struct usb_ep
*out_ep
;
71 static inline struct f_hidg
*func_to_hidg(struct usb_function
*f
)
73 return container_of(f
, struct f_hidg
, func
);
76 /*-------------------------------------------------------------------------*/
77 /* Static descriptors */
79 static struct usb_interface_descriptor hidg_interface_desc
= {
80 .bLength
= sizeof hidg_interface_desc
,
81 .bDescriptorType
= USB_DT_INTERFACE
,
82 /* .bInterfaceNumber = DYNAMIC */
83 .bAlternateSetting
= 0,
85 .bInterfaceClass
= USB_CLASS_HID
,
86 /* .bInterfaceSubClass = DYNAMIC */
87 /* .bInterfaceProtocol = DYNAMIC */
88 /* .iInterface = DYNAMIC */
91 static struct hid_descriptor hidg_desc
= {
92 .bLength
= sizeof hidg_desc
,
93 .bDescriptorType
= HID_DT_HID
,
96 .bNumDescriptors
= 0x1,
97 /*.desc[0].bDescriptorType = DYNAMIC */
98 /*.desc[0].wDescriptorLenght = DYNAMIC */
101 /* High-Speed Support */
103 static struct usb_endpoint_descriptor hidg_hs_in_ep_desc
= {
104 .bLength
= USB_DT_ENDPOINT_SIZE
,
105 .bDescriptorType
= USB_DT_ENDPOINT
,
106 .bEndpointAddress
= USB_DIR_IN
,
107 .bmAttributes
= USB_ENDPOINT_XFER_INT
,
108 /*.wMaxPacketSize = DYNAMIC */
109 .bInterval
= 4, /* FIXME: Add this field in the
110 * HID gadget configuration?
111 * (struct hidg_func_descriptor)
115 static struct usb_endpoint_descriptor hidg_hs_out_ep_desc
= {
116 .bLength
= USB_DT_ENDPOINT_SIZE
,
117 .bDescriptorType
= USB_DT_ENDPOINT
,
118 .bEndpointAddress
= USB_DIR_OUT
,
119 .bmAttributes
= USB_ENDPOINT_XFER_INT
,
120 /*.wMaxPacketSize = DYNAMIC */
121 .bInterval
= 4, /* FIXME: Add this field in the
122 * HID gadget configuration?
123 * (struct hidg_func_descriptor)
127 static struct usb_descriptor_header
*hidg_hs_descriptors
[] = {
128 (struct usb_descriptor_header
*)&hidg_interface_desc
,
129 (struct usb_descriptor_header
*)&hidg_desc
,
130 (struct usb_descriptor_header
*)&hidg_hs_in_ep_desc
,
131 (struct usb_descriptor_header
*)&hidg_hs_out_ep_desc
,
135 /* Full-Speed Support */
137 static struct usb_endpoint_descriptor hidg_fs_in_ep_desc
= {
138 .bLength
= USB_DT_ENDPOINT_SIZE
,
139 .bDescriptorType
= USB_DT_ENDPOINT
,
140 .bEndpointAddress
= USB_DIR_IN
,
141 .bmAttributes
= USB_ENDPOINT_XFER_INT
,
142 /*.wMaxPacketSize = DYNAMIC */
143 .bInterval
= 10, /* FIXME: Add this field in the
144 * HID gadget configuration?
145 * (struct hidg_func_descriptor)
149 static struct usb_endpoint_descriptor hidg_fs_out_ep_desc
= {
150 .bLength
= USB_DT_ENDPOINT_SIZE
,
151 .bDescriptorType
= USB_DT_ENDPOINT
,
152 .bEndpointAddress
= USB_DIR_OUT
,
153 .bmAttributes
= USB_ENDPOINT_XFER_INT
,
154 /*.wMaxPacketSize = DYNAMIC */
155 .bInterval
= 10, /* FIXME: Add this field in the
156 * HID gadget configuration?
157 * (struct hidg_func_descriptor)
161 static struct usb_descriptor_header
*hidg_fs_descriptors
[] = {
162 (struct usb_descriptor_header
*)&hidg_interface_desc
,
163 (struct usb_descriptor_header
*)&hidg_desc
,
164 (struct usb_descriptor_header
*)&hidg_fs_in_ep_desc
,
165 (struct usb_descriptor_header
*)&hidg_fs_out_ep_desc
,
169 /*-------------------------------------------------------------------------*/
172 #define CT_FUNC_HID_IDX 0
174 static struct usb_string ct_func_string_defs
[] = {
175 [CT_FUNC_HID_IDX
].s
= "HID Interface",
176 {}, /* end of list */
179 static struct usb_gadget_strings ct_func_string_table
= {
180 .language
= 0x0409, /* en-US */
181 .strings
= ct_func_string_defs
,
184 static struct usb_gadget_strings
*ct_func_strings
[] = {
185 &ct_func_string_table
,
189 /*-------------------------------------------------------------------------*/
192 static ssize_t
f_hidg_read(struct file
*file
, char __user
*buffer
,
193 size_t count
, loff_t
*ptr
)
195 struct f_hidg
*hidg
= file
->private_data
;
196 struct f_hidg_req_list
*list
;
197 struct usb_request
*req
;
204 if (!access_ok(VERIFY_WRITE
, buffer
, count
))
207 spin_lock_irqsave(&hidg
->spinlock
, flags
);
209 #define READ_COND (!list_empty(&hidg->completed_out_req))
211 /* wait for at least one buffer to complete */
213 spin_unlock_irqrestore(&hidg
->spinlock
, flags
);
214 if (file
->f_flags
& O_NONBLOCK
)
217 if (wait_event_interruptible(hidg
->read_queue
, READ_COND
))
220 spin_lock_irqsave(&hidg
->spinlock
, flags
);
223 /* pick the first one */
224 list
= list_first_entry(&hidg
->completed_out_req
,
225 struct f_hidg_req_list
, list
);
228 * Remove this from list to protect it from beign free()
229 * while host disables our function
231 list_del(&list
->list
);
234 count
= min_t(unsigned int, count
, req
->actual
- list
->pos
);
235 spin_unlock_irqrestore(&hidg
->spinlock
, flags
);
237 /* copy to user outside spinlock */
238 count
-= copy_to_user(buffer
, req
->buf
+ list
->pos
, count
);
242 * if this request is completely handled and transfered to
243 * userspace, remove its entry from the list and requeue it
244 * again. Otherwise, we will revisit it again upon the next
245 * call, taking into account its current read position.
247 if (list
->pos
== req
->actual
) {
250 req
->length
= hidg
->report_length
;
251 ret
= usb_ep_queue(hidg
->out_ep
, req
, GFP_KERNEL
);
253 free_ep_req(hidg
->out_ep
, req
);
257 spin_lock_irqsave(&hidg
->spinlock
, flags
);
258 list_add(&list
->list
, &hidg
->completed_out_req
);
259 spin_unlock_irqrestore(&hidg
->spinlock
, flags
);
261 wake_up(&hidg
->read_queue
);
267 static void f_hidg_req_complete(struct usb_ep
*ep
, struct usb_request
*req
)
269 struct f_hidg
*hidg
= (struct f_hidg
*)ep
->driver_data
;
271 if (req
->status
!= 0) {
272 ERROR(hidg
->func
.config
->cdev
,
273 "End Point Request ERROR: %d\n", req
->status
);
276 hidg
->write_pending
= 0;
277 wake_up(&hidg
->write_queue
);
280 static ssize_t
f_hidg_write(struct file
*file
, const char __user
*buffer
,
281 size_t count
, loff_t
*offp
)
283 struct f_hidg
*hidg
= file
->private_data
;
284 ssize_t status
= -ENOMEM
;
286 if (!access_ok(VERIFY_READ
, buffer
, count
))
289 mutex_lock(&hidg
->lock
);
291 #define WRITE_COND (!hidg->write_pending)
294 while (!WRITE_COND
) {
295 mutex_unlock(&hidg
->lock
);
296 if (file
->f_flags
& O_NONBLOCK
)
299 if (wait_event_interruptible_exclusive(
300 hidg
->write_queue
, WRITE_COND
))
303 mutex_lock(&hidg
->lock
);
306 count
= min_t(unsigned, count
, hidg
->report_length
);
307 status
= copy_from_user(hidg
->req
->buf
, buffer
, count
);
310 ERROR(hidg
->func
.config
->cdev
,
311 "copy_from_user error\n");
312 mutex_unlock(&hidg
->lock
);
316 hidg
->req
->status
= 0;
318 hidg
->req
->length
= count
;
319 hidg
->req
->complete
= f_hidg_req_complete
;
320 hidg
->req
->context
= hidg
;
321 hidg
->write_pending
= 1;
323 status
= usb_ep_queue(hidg
->in_ep
, hidg
->req
, GFP_ATOMIC
);
325 ERROR(hidg
->func
.config
->cdev
,
326 "usb_ep_queue error on int endpoint %zd\n", status
);
327 hidg
->write_pending
= 0;
328 wake_up(&hidg
->write_queue
);
333 mutex_unlock(&hidg
->lock
);
338 static unsigned int f_hidg_poll(struct file
*file
, poll_table
*wait
)
340 struct f_hidg
*hidg
= file
->private_data
;
341 unsigned int ret
= 0;
343 poll_wait(file
, &hidg
->read_queue
, wait
);
344 poll_wait(file
, &hidg
->write_queue
, wait
);
347 ret
|= POLLOUT
| POLLWRNORM
;
350 ret
|= POLLIN
| POLLRDNORM
;
358 static int f_hidg_release(struct inode
*inode
, struct file
*fd
)
360 fd
->private_data
= NULL
;
364 static int f_hidg_open(struct inode
*inode
, struct file
*fd
)
366 struct f_hidg
*hidg
=
367 container_of(inode
->i_cdev
, struct f_hidg
, cdev
);
369 fd
->private_data
= hidg
;
374 /*-------------------------------------------------------------------------*/
377 static inline struct usb_request
*hidg_alloc_ep_req(struct usb_ep
*ep
,
380 return alloc_ep_req(ep
, length
, length
);
383 static void hidg_set_report_complete(struct usb_ep
*ep
, struct usb_request
*req
)
385 struct f_hidg
*hidg
= (struct f_hidg
*) req
->context
;
386 struct f_hidg_req_list
*req_list
;
389 req_list
= kzalloc(sizeof(*req_list
), GFP_ATOMIC
);
395 spin_lock_irqsave(&hidg
->spinlock
, flags
);
396 list_add_tail(&req_list
->list
, &hidg
->completed_out_req
);
397 spin_unlock_irqrestore(&hidg
->spinlock
, flags
);
399 wake_up(&hidg
->read_queue
);
402 static int hidg_setup(struct usb_function
*f
,
403 const struct usb_ctrlrequest
*ctrl
)
405 struct f_hidg
*hidg
= func_to_hidg(f
);
406 struct usb_composite_dev
*cdev
= f
->config
->cdev
;
407 struct usb_request
*req
= cdev
->req
;
411 value
= __le16_to_cpu(ctrl
->wValue
);
412 length
= __le16_to_cpu(ctrl
->wLength
);
415 "%s crtl_request : bRequestType:0x%x bRequest:0x%x Value:0x%x\n",
416 __func__
, ctrl
->bRequestType
, ctrl
->bRequest
, value
);
418 switch ((ctrl
->bRequestType
<< 8) | ctrl
->bRequest
) {
419 case ((USB_DIR_IN
| USB_TYPE_CLASS
| USB_RECIP_INTERFACE
) << 8
420 | HID_REQ_GET_REPORT
):
421 VDBG(cdev
, "get_report\n");
423 /* send an empty report */
424 length
= min_t(unsigned, length
, hidg
->report_length
);
425 memset(req
->buf
, 0x0, length
);
430 case ((USB_DIR_IN
| USB_TYPE_CLASS
| USB_RECIP_INTERFACE
) << 8
431 | HID_REQ_GET_PROTOCOL
):
432 VDBG(cdev
, "get_protocol\n");
436 case ((USB_DIR_OUT
| USB_TYPE_CLASS
| USB_RECIP_INTERFACE
) << 8
437 | HID_REQ_SET_REPORT
):
438 VDBG(cdev
, "set_report | wLength=%d\n", ctrl
->wLength
);
442 case ((USB_DIR_OUT
| USB_TYPE_CLASS
| USB_RECIP_INTERFACE
) << 8
443 | HID_REQ_SET_PROTOCOL
):
444 VDBG(cdev
, "set_protocol\n");
448 case ((USB_DIR_IN
| USB_TYPE_STANDARD
| USB_RECIP_INTERFACE
) << 8
449 | USB_REQ_GET_DESCRIPTOR
):
450 switch (value
>> 8) {
453 struct hid_descriptor hidg_desc_copy
= hidg_desc
;
455 VDBG(cdev
, "USB_REQ_GET_DESCRIPTOR: HID\n");
456 hidg_desc_copy
.desc
[0].bDescriptorType
= HID_DT_REPORT
;
457 hidg_desc_copy
.desc
[0].wDescriptorLength
=
458 cpu_to_le16(hidg
->report_desc_length
);
460 length
= min_t(unsigned short, length
,
461 hidg_desc_copy
.bLength
);
462 memcpy(req
->buf
, &hidg_desc_copy
, length
);
467 VDBG(cdev
, "USB_REQ_GET_DESCRIPTOR: REPORT\n");
468 length
= min_t(unsigned short, length
,
469 hidg
->report_desc_length
);
470 memcpy(req
->buf
, hidg
->report_desc
, length
);
475 VDBG(cdev
, "Unknown descriptor request 0x%x\n",
483 VDBG(cdev
, "Unknown request 0x%x\n",
494 req
->length
= length
;
495 status
= usb_ep_queue(cdev
->gadget
->ep0
, req
, GFP_ATOMIC
);
497 ERROR(cdev
, "usb_ep_queue error on ep0 %d\n", value
);
501 static void hidg_disable(struct usb_function
*f
)
503 struct f_hidg
*hidg
= func_to_hidg(f
);
504 struct f_hidg_req_list
*list
, *next
;
507 usb_ep_disable(hidg
->in_ep
);
508 usb_ep_disable(hidg
->out_ep
);
510 spin_lock_irqsave(&hidg
->spinlock
, flags
);
511 list_for_each_entry_safe(list
, next
, &hidg
->completed_out_req
, list
) {
512 free_ep_req(hidg
->out_ep
, list
->req
);
513 list_del(&list
->list
);
516 spin_unlock_irqrestore(&hidg
->spinlock
, flags
);
519 static int hidg_set_alt(struct usb_function
*f
, unsigned intf
, unsigned alt
)
521 struct usb_composite_dev
*cdev
= f
->config
->cdev
;
522 struct f_hidg
*hidg
= func_to_hidg(f
);
525 VDBG(cdev
, "hidg_set_alt intf:%d alt:%d\n", intf
, alt
);
527 if (hidg
->in_ep
!= NULL
) {
528 /* restart endpoint */
529 usb_ep_disable(hidg
->in_ep
);
531 status
= config_ep_by_speed(f
->config
->cdev
->gadget
, f
,
534 ERROR(cdev
, "config_ep_by_speed FAILED!\n");
537 status
= usb_ep_enable(hidg
->in_ep
);
539 ERROR(cdev
, "Enable IN endpoint FAILED!\n");
542 hidg
->in_ep
->driver_data
= hidg
;
546 if (hidg
->out_ep
!= NULL
) {
547 /* restart endpoint */
548 usb_ep_disable(hidg
->out_ep
);
550 status
= config_ep_by_speed(f
->config
->cdev
->gadget
, f
,
553 ERROR(cdev
, "config_ep_by_speed FAILED!\n");
556 status
= usb_ep_enable(hidg
->out_ep
);
558 ERROR(cdev
, "Enable OUT endpoint FAILED!\n");
561 hidg
->out_ep
->driver_data
= hidg
;
564 * allocate a bunch of read buffers and queue them all at once.
566 for (i
= 0; i
< hidg
->qlen
&& status
== 0; i
++) {
567 struct usb_request
*req
=
568 hidg_alloc_ep_req(hidg
->out_ep
,
569 hidg
->report_length
);
571 req
->complete
= hidg_set_report_complete
;
573 status
= usb_ep_queue(hidg
->out_ep
, req
,
576 ERROR(cdev
, "%s queue req --> %d\n",
577 hidg
->out_ep
->name
, status
);
579 usb_ep_disable(hidg
->out_ep
);
590 static const struct file_operations f_hidg_fops
= {
591 .owner
= THIS_MODULE
,
593 .release
= f_hidg_release
,
594 .write
= f_hidg_write
,
597 .llseek
= noop_llseek
,
600 static int hidg_bind(struct usb_configuration
*c
, struct usb_function
*f
)
603 struct f_hidg
*hidg
= func_to_hidg(f
);
604 struct usb_string
*us
;
605 struct device
*device
;
609 /* maybe allocate device-global string IDs, and patch descriptors */
610 us
= usb_gstrings_attach(c
->cdev
, ct_func_strings
,
611 ARRAY_SIZE(ct_func_string_defs
));
614 hidg_interface_desc
.iInterface
= us
[CT_FUNC_HID_IDX
].id
;
616 /* allocate instance-specific interface IDs, and patch descriptors */
617 status
= usb_interface_id(c
, f
);
620 hidg_interface_desc
.bInterfaceNumber
= status
;
622 /* allocate instance-specific endpoints */
624 ep
= usb_ep_autoconfig(c
->cdev
->gadget
, &hidg_fs_in_ep_desc
);
629 ep
= usb_ep_autoconfig(c
->cdev
->gadget
, &hidg_fs_out_ep_desc
);
634 /* preallocate request and buffer */
636 hidg
->req
= usb_ep_alloc_request(hidg
->in_ep
, GFP_KERNEL
);
640 hidg
->req
->buf
= kmalloc(hidg
->report_length
, GFP_KERNEL
);
644 /* set descriptor dynamic values */
645 hidg_interface_desc
.bInterfaceSubClass
= hidg
->bInterfaceSubClass
;
646 hidg_interface_desc
.bInterfaceProtocol
= hidg
->bInterfaceProtocol
;
647 hidg_hs_in_ep_desc
.wMaxPacketSize
= cpu_to_le16(hidg
->report_length
);
648 hidg_fs_in_ep_desc
.wMaxPacketSize
= cpu_to_le16(hidg
->report_length
);
649 hidg_hs_out_ep_desc
.wMaxPacketSize
= cpu_to_le16(hidg
->report_length
);
650 hidg_fs_out_ep_desc
.wMaxPacketSize
= cpu_to_le16(hidg
->report_length
);
652 * We can use hidg_desc struct here but we should not relay
653 * that its content won't change after returning from this function.
655 hidg_desc
.desc
[0].bDescriptorType
= HID_DT_REPORT
;
656 hidg_desc
.desc
[0].wDescriptorLength
=
657 cpu_to_le16(hidg
->report_desc_length
);
659 hidg_hs_in_ep_desc
.bEndpointAddress
=
660 hidg_fs_in_ep_desc
.bEndpointAddress
;
661 hidg_hs_out_ep_desc
.bEndpointAddress
=
662 hidg_fs_out_ep_desc
.bEndpointAddress
;
664 status
= usb_assign_descriptors(f
, hidg_fs_descriptors
,
665 hidg_hs_descriptors
, NULL
);
669 mutex_init(&hidg
->lock
);
670 spin_lock_init(&hidg
->spinlock
);
671 init_waitqueue_head(&hidg
->write_queue
);
672 init_waitqueue_head(&hidg
->read_queue
);
673 INIT_LIST_HEAD(&hidg
->completed_out_req
);
675 /* create char device */
676 cdev_init(&hidg
->cdev
, &f_hidg_fops
);
677 dev
= MKDEV(major
, hidg
->minor
);
678 status
= cdev_add(&hidg
->cdev
, dev
, 1);
680 goto fail_free_descs
;
682 device
= device_create(hidg_class
, NULL
, dev
, NULL
,
683 "%s%d", "hidg", hidg
->minor
);
684 if (IS_ERR(device
)) {
685 status
= PTR_ERR(device
);
691 cdev_del(&hidg
->cdev
);
693 usb_free_all_descriptors(f
);
695 ERROR(f
->config
->cdev
, "hidg_bind FAILED\n");
696 if (hidg
->req
!= NULL
) {
697 kfree(hidg
->req
->buf
);
698 if (hidg
->in_ep
!= NULL
)
699 usb_ep_free_request(hidg
->in_ep
, hidg
->req
);
705 static inline int hidg_get_minor(void)
709 ret
= ida_simple_get(&hidg_ida
, 0, 0, GFP_KERNEL
);
710 if (ret
>= HIDG_MINORS
) {
711 ida_simple_remove(&hidg_ida
, ret
);
718 static inline struct f_hid_opts
*to_f_hid_opts(struct config_item
*item
)
720 return container_of(to_config_group(item
), struct f_hid_opts
,
724 static void hid_attr_release(struct config_item
*item
)
726 struct f_hid_opts
*opts
= to_f_hid_opts(item
);
728 usb_put_function_instance(&opts
->func_inst
);
731 static struct configfs_item_operations hidg_item_ops
= {
732 .release
= hid_attr_release
,
735 #define F_HID_OPT(name, prec, limit) \
736 static ssize_t f_hid_opts_##name##_show(struct config_item *item, char *page)\
738 struct f_hid_opts *opts = to_f_hid_opts(item); \
741 mutex_lock(&opts->lock); \
742 result = sprintf(page, "%d\n", opts->name); \
743 mutex_unlock(&opts->lock); \
748 static ssize_t f_hid_opts_##name##_store(struct config_item *item, \
749 const char *page, size_t len) \
751 struct f_hid_opts *opts = to_f_hid_opts(item); \
755 mutex_lock(&opts->lock); \
756 if (opts->refcnt) { \
761 ret = kstrtou##prec(page, 0, &num); \
773 mutex_unlock(&opts->lock); \
777 CONFIGFS_ATTR(f_hid_opts_, name)
779 F_HID_OPT(subclass
, 8, 255);
780 F_HID_OPT(protocol
, 8, 255);
781 F_HID_OPT(report_length
, 16, 65535);
783 static ssize_t
f_hid_opts_report_desc_show(struct config_item
*item
, char *page
)
785 struct f_hid_opts
*opts
= to_f_hid_opts(item
);
788 mutex_lock(&opts
->lock
);
789 result
= opts
->report_desc_length
;
790 memcpy(page
, opts
->report_desc
, opts
->report_desc_length
);
791 mutex_unlock(&opts
->lock
);
796 static ssize_t
f_hid_opts_report_desc_store(struct config_item
*item
,
797 const char *page
, size_t len
)
799 struct f_hid_opts
*opts
= to_f_hid_opts(item
);
803 mutex_lock(&opts
->lock
);
807 if (len
> PAGE_SIZE
) {
811 d
= kmemdup(page
, len
, GFP_KERNEL
);
816 kfree(opts
->report_desc
);
817 opts
->report_desc
= d
;
818 opts
->report_desc_length
= len
;
819 opts
->report_desc_alloc
= true;
822 mutex_unlock(&opts
->lock
);
826 CONFIGFS_ATTR(f_hid_opts_
, report_desc
);
828 static struct configfs_attribute
*hid_attrs
[] = {
829 &f_hid_opts_attr_subclass
,
830 &f_hid_opts_attr_protocol
,
831 &f_hid_opts_attr_report_length
,
832 &f_hid_opts_attr_report_desc
,
836 static struct config_item_type hid_func_type
= {
837 .ct_item_ops
= &hidg_item_ops
,
838 .ct_attrs
= hid_attrs
,
839 .ct_owner
= THIS_MODULE
,
842 static inline void hidg_put_minor(int minor
)
844 ida_simple_remove(&hidg_ida
, minor
);
847 static void hidg_free_inst(struct usb_function_instance
*f
)
849 struct f_hid_opts
*opts
;
851 opts
= container_of(f
, struct f_hid_opts
, func_inst
);
853 mutex_lock(&hidg_ida_lock
);
855 hidg_put_minor(opts
->minor
);
856 if (idr_is_empty(&hidg_ida
.idr
))
859 mutex_unlock(&hidg_ida_lock
);
861 if (opts
->report_desc_alloc
)
862 kfree(opts
->report_desc
);
867 static struct usb_function_instance
*hidg_alloc_inst(void)
869 struct f_hid_opts
*opts
;
870 struct usb_function_instance
*ret
;
873 opts
= kzalloc(sizeof(*opts
), GFP_KERNEL
);
875 return ERR_PTR(-ENOMEM
);
876 mutex_init(&opts
->lock
);
877 opts
->func_inst
.free_func_inst
= hidg_free_inst
;
878 ret
= &opts
->func_inst
;
880 mutex_lock(&hidg_ida_lock
);
882 if (idr_is_empty(&hidg_ida
.idr
)) {
883 status
= ghid_setup(NULL
, HIDG_MINORS
);
885 ret
= ERR_PTR(status
);
891 opts
->minor
= hidg_get_minor();
892 if (opts
->minor
< 0) {
893 ret
= ERR_PTR(opts
->minor
);
895 if (idr_is_empty(&hidg_ida
.idr
))
899 config_group_init_type_name(&opts
->func_inst
.group
, "", &hid_func_type
);
902 mutex_unlock(&hidg_ida_lock
);
906 static void hidg_free(struct usb_function
*f
)
909 struct f_hid_opts
*opts
;
911 hidg
= func_to_hidg(f
);
912 opts
= container_of(f
->fi
, struct f_hid_opts
, func_inst
);
913 kfree(hidg
->report_desc
);
915 mutex_lock(&opts
->lock
);
917 mutex_unlock(&opts
->lock
);
920 static void hidg_unbind(struct usb_configuration
*c
, struct usb_function
*f
)
922 struct f_hidg
*hidg
= func_to_hidg(f
);
924 device_destroy(hidg_class
, MKDEV(major
, hidg
->minor
));
925 cdev_del(&hidg
->cdev
);
927 /* disable/free request and end point */
928 usb_ep_disable(hidg
->in_ep
);
929 kfree(hidg
->req
->buf
);
930 usb_ep_free_request(hidg
->in_ep
, hidg
->req
);
932 usb_free_all_descriptors(f
);
935 static struct usb_function
*hidg_alloc(struct usb_function_instance
*fi
)
938 struct f_hid_opts
*opts
;
940 /* allocate and initialize one new instance */
941 hidg
= kzalloc(sizeof(*hidg
), GFP_KERNEL
);
943 return ERR_PTR(-ENOMEM
);
945 opts
= container_of(fi
, struct f_hid_opts
, func_inst
);
947 mutex_lock(&opts
->lock
);
950 hidg
->minor
= opts
->minor
;
951 hidg
->bInterfaceSubClass
= opts
->subclass
;
952 hidg
->bInterfaceProtocol
= opts
->protocol
;
953 hidg
->report_length
= opts
->report_length
;
954 hidg
->report_desc_length
= opts
->report_desc_length
;
955 if (opts
->report_desc
) {
956 hidg
->report_desc
= kmemdup(opts
->report_desc
,
957 opts
->report_desc_length
,
959 if (!hidg
->report_desc
) {
961 mutex_unlock(&opts
->lock
);
962 return ERR_PTR(-ENOMEM
);
966 mutex_unlock(&opts
->lock
);
968 hidg
->func
.name
= "hid";
969 hidg
->func
.bind
= hidg_bind
;
970 hidg
->func
.unbind
= hidg_unbind
;
971 hidg
->func
.set_alt
= hidg_set_alt
;
972 hidg
->func
.disable
= hidg_disable
;
973 hidg
->func
.setup
= hidg_setup
;
974 hidg
->func
.free_func
= hidg_free
;
976 /* this could me made configurable at some point */
982 DECLARE_USB_FUNCTION_INIT(hid
, hidg_alloc_inst
, hidg_alloc
);
983 MODULE_LICENSE("GPL");
984 MODULE_AUTHOR("Fabien Chouteau");
986 int ghid_setup(struct usb_gadget
*g
, int count
)
991 hidg_class
= class_create(THIS_MODULE
, "hidg");
992 if (IS_ERR(hidg_class
)) {
993 status
= PTR_ERR(hidg_class
);
998 status
= alloc_chrdev_region(&dev
, 0, count
, "hidg");
1000 class_destroy(hidg_class
);
1011 void ghid_cleanup(void)
1014 unregister_chrdev_region(MKDEV(major
, 0), minors
);
1018 class_destroy(hidg_class
);