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
);
227 count
= min_t(unsigned int, count
, req
->actual
- list
->pos
);
228 spin_unlock_irqrestore(&hidg
->spinlock
, flags
);
230 /* copy to user outside spinlock */
231 count
-= copy_to_user(buffer
, req
->buf
+ list
->pos
, count
);
235 * if this request is completely handled and transfered to
236 * userspace, remove its entry from the list and requeue it
237 * again. Otherwise, we will revisit it again upon the next
238 * call, taking into account its current read position.
240 if (list
->pos
== req
->actual
) {
241 spin_lock_irqsave(&hidg
->spinlock
, flags
);
242 list_del(&list
->list
);
244 spin_unlock_irqrestore(&hidg
->spinlock
, flags
);
246 req
->length
= hidg
->report_length
;
247 ret
= usb_ep_queue(hidg
->out_ep
, req
, GFP_KERNEL
);
255 static void f_hidg_req_complete(struct usb_ep
*ep
, struct usb_request
*req
)
257 struct f_hidg
*hidg
= (struct f_hidg
*)ep
->driver_data
;
259 if (req
->status
!= 0) {
260 ERROR(hidg
->func
.config
->cdev
,
261 "End Point Request ERROR: %d\n", req
->status
);
264 hidg
->write_pending
= 0;
265 wake_up(&hidg
->write_queue
);
268 static ssize_t
f_hidg_write(struct file
*file
, const char __user
*buffer
,
269 size_t count
, loff_t
*offp
)
271 struct f_hidg
*hidg
= file
->private_data
;
272 ssize_t status
= -ENOMEM
;
274 if (!access_ok(VERIFY_READ
, buffer
, count
))
277 mutex_lock(&hidg
->lock
);
279 #define WRITE_COND (!hidg->write_pending)
282 while (!WRITE_COND
) {
283 mutex_unlock(&hidg
->lock
);
284 if (file
->f_flags
& O_NONBLOCK
)
287 if (wait_event_interruptible_exclusive(
288 hidg
->write_queue
, WRITE_COND
))
291 mutex_lock(&hidg
->lock
);
294 count
= min_t(unsigned, count
, hidg
->report_length
);
295 status
= copy_from_user(hidg
->req
->buf
, buffer
, count
);
298 ERROR(hidg
->func
.config
->cdev
,
299 "copy_from_user error\n");
300 mutex_unlock(&hidg
->lock
);
304 hidg
->req
->status
= 0;
306 hidg
->req
->length
= count
;
307 hidg
->req
->complete
= f_hidg_req_complete
;
308 hidg
->req
->context
= hidg
;
309 hidg
->write_pending
= 1;
311 status
= usb_ep_queue(hidg
->in_ep
, hidg
->req
, GFP_ATOMIC
);
313 ERROR(hidg
->func
.config
->cdev
,
314 "usb_ep_queue error on int endpoint %zd\n", status
);
315 hidg
->write_pending
= 0;
316 wake_up(&hidg
->write_queue
);
321 mutex_unlock(&hidg
->lock
);
326 static unsigned int f_hidg_poll(struct file
*file
, poll_table
*wait
)
328 struct f_hidg
*hidg
= file
->private_data
;
329 unsigned int ret
= 0;
331 poll_wait(file
, &hidg
->read_queue
, wait
);
332 poll_wait(file
, &hidg
->write_queue
, wait
);
335 ret
|= POLLOUT
| POLLWRNORM
;
338 ret
|= POLLIN
| POLLRDNORM
;
346 static int f_hidg_release(struct inode
*inode
, struct file
*fd
)
348 fd
->private_data
= NULL
;
352 static int f_hidg_open(struct inode
*inode
, struct file
*fd
)
354 struct f_hidg
*hidg
=
355 container_of(inode
->i_cdev
, struct f_hidg
, cdev
);
357 fd
->private_data
= hidg
;
362 /*-------------------------------------------------------------------------*/
365 static inline struct usb_request
*hidg_alloc_ep_req(struct usb_ep
*ep
,
368 return alloc_ep_req(ep
, length
, length
);
371 static void hidg_set_report_complete(struct usb_ep
*ep
, struct usb_request
*req
)
373 struct f_hidg
*hidg
= (struct f_hidg
*) req
->context
;
374 struct f_hidg_req_list
*req_list
;
377 req_list
= kzalloc(sizeof(*req_list
), GFP_ATOMIC
);
383 spin_lock_irqsave(&hidg
->spinlock
, flags
);
384 list_add_tail(&req_list
->list
, &hidg
->completed_out_req
);
385 spin_unlock_irqrestore(&hidg
->spinlock
, flags
);
387 wake_up(&hidg
->read_queue
);
390 static int hidg_setup(struct usb_function
*f
,
391 const struct usb_ctrlrequest
*ctrl
)
393 struct f_hidg
*hidg
= func_to_hidg(f
);
394 struct usb_composite_dev
*cdev
= f
->config
->cdev
;
395 struct usb_request
*req
= cdev
->req
;
399 value
= __le16_to_cpu(ctrl
->wValue
);
400 length
= __le16_to_cpu(ctrl
->wLength
);
403 "%s crtl_request : bRequestType:0x%x bRequest:0x%x Value:0x%x\n",
404 __func__
, ctrl
->bRequestType
, ctrl
->bRequest
, value
);
406 switch ((ctrl
->bRequestType
<< 8) | ctrl
->bRequest
) {
407 case ((USB_DIR_IN
| USB_TYPE_CLASS
| USB_RECIP_INTERFACE
) << 8
408 | HID_REQ_GET_REPORT
):
409 VDBG(cdev
, "get_report\n");
411 /* send an empty report */
412 length
= min_t(unsigned, length
, hidg
->report_length
);
413 memset(req
->buf
, 0x0, length
);
418 case ((USB_DIR_IN
| USB_TYPE_CLASS
| USB_RECIP_INTERFACE
) << 8
419 | HID_REQ_GET_PROTOCOL
):
420 VDBG(cdev
, "get_protocol\n");
424 case ((USB_DIR_OUT
| USB_TYPE_CLASS
| USB_RECIP_INTERFACE
) << 8
425 | HID_REQ_SET_REPORT
):
426 VDBG(cdev
, "set_report | wLength=%d\n", ctrl
->wLength
);
430 case ((USB_DIR_OUT
| USB_TYPE_CLASS
| USB_RECIP_INTERFACE
) << 8
431 | HID_REQ_SET_PROTOCOL
):
432 VDBG(cdev
, "set_protocol\n");
436 case ((USB_DIR_IN
| USB_TYPE_STANDARD
| USB_RECIP_INTERFACE
) << 8
437 | USB_REQ_GET_DESCRIPTOR
):
438 switch (value
>> 8) {
440 VDBG(cdev
, "USB_REQ_GET_DESCRIPTOR: HID\n");
441 length
= min_t(unsigned short, length
,
443 memcpy(req
->buf
, &hidg_desc
, length
);
447 VDBG(cdev
, "USB_REQ_GET_DESCRIPTOR: REPORT\n");
448 length
= min_t(unsigned short, length
,
449 hidg
->report_desc_length
);
450 memcpy(req
->buf
, hidg
->report_desc
, length
);
455 VDBG(cdev
, "Unknown descriptor request 0x%x\n",
463 VDBG(cdev
, "Unknown request 0x%x\n",
474 req
->length
= length
;
475 status
= usb_ep_queue(cdev
->gadget
->ep0
, req
, GFP_ATOMIC
);
477 ERROR(cdev
, "usb_ep_queue error on ep0 %d\n", value
);
481 static void hidg_disable(struct usb_function
*f
)
483 struct f_hidg
*hidg
= func_to_hidg(f
);
484 struct f_hidg_req_list
*list
, *next
;
486 usb_ep_disable(hidg
->in_ep
);
487 hidg
->in_ep
->driver_data
= NULL
;
489 usb_ep_disable(hidg
->out_ep
);
490 hidg
->out_ep
->driver_data
= NULL
;
492 list_for_each_entry_safe(list
, next
, &hidg
->completed_out_req
, list
) {
493 list_del(&list
->list
);
498 static int hidg_set_alt(struct usb_function
*f
, unsigned intf
, unsigned alt
)
500 struct usb_composite_dev
*cdev
= f
->config
->cdev
;
501 struct f_hidg
*hidg
= func_to_hidg(f
);
504 VDBG(cdev
, "hidg_set_alt intf:%d alt:%d\n", intf
, alt
);
506 if (hidg
->in_ep
!= NULL
) {
507 /* restart endpoint */
508 if (hidg
->in_ep
->driver_data
!= NULL
)
509 usb_ep_disable(hidg
->in_ep
);
511 status
= config_ep_by_speed(f
->config
->cdev
->gadget
, f
,
514 ERROR(cdev
, "config_ep_by_speed FAILED!\n");
517 status
= usb_ep_enable(hidg
->in_ep
);
519 ERROR(cdev
, "Enable IN endpoint FAILED!\n");
522 hidg
->in_ep
->driver_data
= hidg
;
526 if (hidg
->out_ep
!= NULL
) {
527 /* restart endpoint */
528 if (hidg
->out_ep
->driver_data
!= NULL
)
529 usb_ep_disable(hidg
->out_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
->out_ep
);
539 ERROR(cdev
, "Enable IN endpoint FAILED!\n");
542 hidg
->out_ep
->driver_data
= hidg
;
545 * allocate a bunch of read buffers and queue them all at once.
547 for (i
= 0; i
< hidg
->qlen
&& status
== 0; i
++) {
548 struct usb_request
*req
=
549 hidg_alloc_ep_req(hidg
->out_ep
,
550 hidg
->report_length
);
552 req
->complete
= hidg_set_report_complete
;
554 status
= usb_ep_queue(hidg
->out_ep
, req
,
557 ERROR(cdev
, "%s queue req --> %d\n",
558 hidg
->out_ep
->name
, status
);
560 usb_ep_disable(hidg
->out_ep
);
561 hidg
->out_ep
->driver_data
= NULL
;
572 static const struct file_operations f_hidg_fops
= {
573 .owner
= THIS_MODULE
,
575 .release
= f_hidg_release
,
576 .write
= f_hidg_write
,
579 .llseek
= noop_llseek
,
582 static int hidg_bind(struct usb_configuration
*c
, struct usb_function
*f
)
585 struct f_hidg
*hidg
= func_to_hidg(f
);
586 struct usb_string
*us
;
587 struct device
*device
;
591 /* maybe allocate device-global string IDs, and patch descriptors */
592 us
= usb_gstrings_attach(c
->cdev
, ct_func_strings
,
593 ARRAY_SIZE(ct_func_string_defs
));
596 hidg_interface_desc
.iInterface
= us
[CT_FUNC_HID_IDX
].id
;
598 /* allocate instance-specific interface IDs, and patch descriptors */
599 status
= usb_interface_id(c
, f
);
602 hidg_interface_desc
.bInterfaceNumber
= status
;
604 /* allocate instance-specific endpoints */
606 ep
= usb_ep_autoconfig(c
->cdev
->gadget
, &hidg_fs_in_ep_desc
);
609 ep
->driver_data
= c
->cdev
; /* claim */
612 ep
= usb_ep_autoconfig(c
->cdev
->gadget
, &hidg_fs_out_ep_desc
);
615 ep
->driver_data
= c
->cdev
; /* claim */
618 /* preallocate request and buffer */
620 hidg
->req
= usb_ep_alloc_request(hidg
->in_ep
, GFP_KERNEL
);
624 hidg
->req
->buf
= kmalloc(hidg
->report_length
, GFP_KERNEL
);
628 /* set descriptor dynamic values */
629 hidg_interface_desc
.bInterfaceSubClass
= hidg
->bInterfaceSubClass
;
630 hidg_interface_desc
.bInterfaceProtocol
= hidg
->bInterfaceProtocol
;
631 hidg_hs_in_ep_desc
.wMaxPacketSize
= cpu_to_le16(hidg
->report_length
);
632 hidg_fs_in_ep_desc
.wMaxPacketSize
= cpu_to_le16(hidg
->report_length
);
633 hidg_hs_out_ep_desc
.wMaxPacketSize
= cpu_to_le16(hidg
->report_length
);
634 hidg_fs_out_ep_desc
.wMaxPacketSize
= cpu_to_le16(hidg
->report_length
);
635 hidg_desc
.desc
[0].bDescriptorType
= HID_DT_REPORT
;
636 hidg_desc
.desc
[0].wDescriptorLength
=
637 cpu_to_le16(hidg
->report_desc_length
);
639 hidg_hs_in_ep_desc
.bEndpointAddress
=
640 hidg_fs_in_ep_desc
.bEndpointAddress
;
641 hidg_hs_out_ep_desc
.bEndpointAddress
=
642 hidg_fs_out_ep_desc
.bEndpointAddress
;
644 status
= usb_assign_descriptors(f
, hidg_fs_descriptors
,
645 hidg_hs_descriptors
, NULL
);
649 mutex_init(&hidg
->lock
);
650 spin_lock_init(&hidg
->spinlock
);
651 init_waitqueue_head(&hidg
->write_queue
);
652 init_waitqueue_head(&hidg
->read_queue
);
653 INIT_LIST_HEAD(&hidg
->completed_out_req
);
655 /* create char device */
656 cdev_init(&hidg
->cdev
, &f_hidg_fops
);
657 dev
= MKDEV(major
, hidg
->minor
);
658 status
= cdev_add(&hidg
->cdev
, dev
, 1);
660 goto fail_free_descs
;
662 device
= device_create(hidg_class
, NULL
, dev
, NULL
,
663 "%s%d", "hidg", hidg
->minor
);
664 if (IS_ERR(device
)) {
665 status
= PTR_ERR(device
);
671 cdev_del(&hidg
->cdev
);
673 usb_free_all_descriptors(f
);
675 ERROR(f
->config
->cdev
, "hidg_bind FAILED\n");
676 if (hidg
->req
!= NULL
) {
677 kfree(hidg
->req
->buf
);
678 if (hidg
->in_ep
!= NULL
)
679 usb_ep_free_request(hidg
->in_ep
, hidg
->req
);
685 static inline int hidg_get_minor(void)
689 ret
= ida_simple_get(&hidg_ida
, 0, 0, GFP_KERNEL
);
694 static inline struct f_hid_opts
*to_f_hid_opts(struct config_item
*item
)
696 return container_of(to_config_group(item
), struct f_hid_opts
,
700 CONFIGFS_ATTR_STRUCT(f_hid_opts
);
701 CONFIGFS_ATTR_OPS(f_hid_opts
);
703 static void hid_attr_release(struct config_item
*item
)
705 struct f_hid_opts
*opts
= to_f_hid_opts(item
);
707 usb_put_function_instance(&opts
->func_inst
);
710 static struct configfs_item_operations hidg_item_ops
= {
711 .release
= hid_attr_release
,
712 .show_attribute
= f_hid_opts_attr_show
,
713 .store_attribute
= f_hid_opts_attr_store
,
716 #define F_HID_OPT(name, prec, limit) \
717 static ssize_t f_hid_opts_##name##_show(struct f_hid_opts *opts, char *page)\
721 mutex_lock(&opts->lock); \
722 result = sprintf(page, "%d\n", opts->name); \
723 mutex_unlock(&opts->lock); \
728 static ssize_t f_hid_opts_##name##_store(struct f_hid_opts *opts, \
729 const char *page, size_t len) \
734 mutex_lock(&opts->lock); \
735 if (opts->refcnt) { \
740 ret = kstrtou##prec(page, 0, &num); \
752 mutex_unlock(&opts->lock); \
756 static struct f_hid_opts_attribute f_hid_opts_##name = \
757 __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, f_hid_opts_##name##_show,\
758 f_hid_opts_##name##_store)
760 F_HID_OPT(subclass
, 8, 255);
761 F_HID_OPT(protocol
, 8, 255);
762 F_HID_OPT(report_length
, 16, 65535);
764 static ssize_t
f_hid_opts_report_desc_show(struct f_hid_opts
*opts
, char *page
)
768 mutex_lock(&opts
->lock
);
769 result
= opts
->report_desc_length
;
770 memcpy(page
, opts
->report_desc
, opts
->report_desc_length
);
771 mutex_unlock(&opts
->lock
);
776 static ssize_t
f_hid_opts_report_desc_store(struct f_hid_opts
*opts
,
777 const char *page
, size_t len
)
782 mutex_lock(&opts
->lock
);
786 if (len
> PAGE_SIZE
) {
790 d
= kmemdup(page
, len
, GFP_KERNEL
);
795 kfree(opts
->report_desc
);
796 opts
->report_desc
= d
;
797 opts
->report_desc_length
= len
;
798 opts
->report_desc_alloc
= true;
801 mutex_unlock(&opts
->lock
);
805 static struct f_hid_opts_attribute f_hid_opts_report_desc
=
806 __CONFIGFS_ATTR(report_desc
, S_IRUGO
| S_IWUSR
,
807 f_hid_opts_report_desc_show
,
808 f_hid_opts_report_desc_store
);
810 static struct configfs_attribute
*hid_attrs
[] = {
811 &f_hid_opts_subclass
.attr
,
812 &f_hid_opts_protocol
.attr
,
813 &f_hid_opts_report_length
.attr
,
814 &f_hid_opts_report_desc
.attr
,
818 static struct config_item_type hid_func_type
= {
819 .ct_item_ops
= &hidg_item_ops
,
820 .ct_attrs
= hid_attrs
,
821 .ct_owner
= THIS_MODULE
,
824 static inline void hidg_put_minor(int minor
)
826 ida_simple_remove(&hidg_ida
, minor
);
829 static void hidg_free_inst(struct usb_function_instance
*f
)
831 struct f_hid_opts
*opts
;
833 opts
= container_of(f
, struct f_hid_opts
, func_inst
);
835 mutex_lock(&hidg_ida_lock
);
837 hidg_put_minor(opts
->minor
);
838 if (idr_is_empty(&hidg_ida
.idr
))
841 mutex_unlock(&hidg_ida_lock
);
843 if (opts
->report_desc_alloc
)
844 kfree(opts
->report_desc
);
849 static struct usb_function_instance
*hidg_alloc_inst(void)
851 struct f_hid_opts
*opts
;
852 struct usb_function_instance
*ret
;
855 opts
= kzalloc(sizeof(*opts
), GFP_KERNEL
);
857 return ERR_PTR(-ENOMEM
);
858 mutex_init(&opts
->lock
);
859 opts
->func_inst
.free_func_inst
= hidg_free_inst
;
860 ret
= &opts
->func_inst
;
862 mutex_lock(&hidg_ida_lock
);
864 if (idr_is_empty(&hidg_ida
.idr
)) {
865 status
= ghid_setup(NULL
, HIDG_MINORS
);
867 ret
= ERR_PTR(status
);
873 opts
->minor
= hidg_get_minor();
874 if (opts
->minor
< 0) {
875 ret
= ERR_PTR(opts
->minor
);
877 if (idr_is_empty(&hidg_ida
.idr
))
881 config_group_init_type_name(&opts
->func_inst
.group
, "", &hid_func_type
);
884 mutex_unlock(&hidg_ida_lock
);
888 static void hidg_free(struct usb_function
*f
)
891 struct f_hid_opts
*opts
;
893 hidg
= func_to_hidg(f
);
894 opts
= container_of(f
->fi
, struct f_hid_opts
, func_inst
);
895 kfree(hidg
->report_desc
);
897 mutex_lock(&opts
->lock
);
899 mutex_unlock(&opts
->lock
);
902 static void hidg_unbind(struct usb_configuration
*c
, struct usb_function
*f
)
904 struct f_hidg
*hidg
= func_to_hidg(f
);
906 device_destroy(hidg_class
, MKDEV(major
, hidg
->minor
));
907 cdev_del(&hidg
->cdev
);
909 /* disable/free request and end point */
910 usb_ep_disable(hidg
->in_ep
);
911 usb_ep_dequeue(hidg
->in_ep
, hidg
->req
);
912 kfree(hidg
->req
->buf
);
913 usb_ep_free_request(hidg
->in_ep
, hidg
->req
);
915 usb_free_all_descriptors(f
);
918 static struct usb_function
*hidg_alloc(struct usb_function_instance
*fi
)
921 struct f_hid_opts
*opts
;
923 /* allocate and initialize one new instance */
924 hidg
= kzalloc(sizeof(*hidg
), GFP_KERNEL
);
926 return ERR_PTR(-ENOMEM
);
928 opts
= container_of(fi
, struct f_hid_opts
, func_inst
);
930 mutex_lock(&opts
->lock
);
933 hidg
->minor
= opts
->minor
;
934 hidg
->bInterfaceSubClass
= opts
->subclass
;
935 hidg
->bInterfaceProtocol
= opts
->protocol
;
936 hidg
->report_length
= opts
->report_length
;
937 hidg
->report_desc_length
= opts
->report_desc_length
;
938 if (opts
->report_desc
) {
939 hidg
->report_desc
= kmemdup(opts
->report_desc
,
940 opts
->report_desc_length
,
942 if (!hidg
->report_desc
) {
944 mutex_unlock(&opts
->lock
);
945 return ERR_PTR(-ENOMEM
);
949 mutex_unlock(&opts
->lock
);
951 hidg
->func
.name
= "hid";
952 hidg
->func
.bind
= hidg_bind
;
953 hidg
->func
.unbind
= hidg_unbind
;
954 hidg
->func
.set_alt
= hidg_set_alt
;
955 hidg
->func
.disable
= hidg_disable
;
956 hidg
->func
.setup
= hidg_setup
;
957 hidg
->func
.free_func
= hidg_free
;
959 /* this could me made configurable at some point */
965 DECLARE_USB_FUNCTION_INIT(hid
, hidg_alloc_inst
, hidg_alloc
);
966 MODULE_LICENSE("GPL");
967 MODULE_AUTHOR("Fabien Chouteau");
969 int ghid_setup(struct usb_gadget
*g
, int count
)
974 hidg_class
= class_create(THIS_MODULE
, "hidg");
975 if (IS_ERR(hidg_class
)) {
976 status
= PTR_ERR(hidg_class
);
981 status
= alloc_chrdev_region(&dev
, 0, count
, "hidg");
983 class_destroy(hidg_class
);
994 void ghid_cleanup(void)
997 unregister_chrdev_region(MKDEV(major
, 0), minors
);
1001 class_destroy(hidg_class
);