2 * f_audio.c -- USB Audio class function driver
4 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
5 * Copyright (C) 2008 Analog Devices, Inc
7 * Enter bugs at http://blackfin.uclinux.org/
9 * Licensed under the GPL-2 or later.
12 #include <linux/slab.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/device.h>
16 #include <linux/atomic.h>
20 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value);
21 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd);
24 * DESCRIPTORS ... most are static, but strings and full
25 * configuration descriptors are built on demand.
29 * We have two interfaces- AudioControl and AudioStreaming
30 * TODO: only supcard playback currently
32 #define F_AUDIO_AC_INTERFACE 0
33 #define F_AUDIO_AS_INTERFACE 1
34 #define F_AUDIO_NUM_INTERFACES 2
36 /* B.3.1 Standard AC Interface Descriptor */
37 static struct usb_interface_descriptor ac_interface_desc = {
38 .bLength = USB_DT_INTERFACE_SIZE,
39 .bDescriptorType = USB_DT_INTERFACE,
41 .bInterfaceClass = USB_CLASS_AUDIO,
42 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
45 DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
47 #define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
48 /* 1 input terminal, 1 output terminal and 1 feature unit */
49 #define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH + UAC_DT_INPUT_TERMINAL_SIZE \
50 + UAC_DT_OUTPUT_TERMINAL_SIZE + UAC_DT_FEATURE_UNIT_SIZE(0))
51 /* B.3.2 Class-Specific AC Interface Descriptor */
52 static struct uac1_ac_header_descriptor_2 ac_header_desc = {
53 .bLength = UAC_DT_AC_HEADER_LENGTH,
54 .bDescriptorType = USB_DT_CS_INTERFACE,
55 .bDescriptorSubtype = UAC_HEADER,
56 .bcdADC = __constant_cpu_to_le16(0x0100),
57 .wTotalLength = __constant_cpu_to_le16(UAC_DT_TOTAL_LENGTH),
58 .bInCollection = F_AUDIO_NUM_INTERFACES,
60 [0] = F_AUDIO_AC_INTERFACE,
61 [1] = F_AUDIO_AS_INTERFACE,
65 #define INPUT_TERMINAL_ID 1
66 static struct uac_input_terminal_descriptor input_terminal_desc = {
67 .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
68 .bDescriptorType = USB_DT_CS_INTERFACE,
69 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
70 .bTerminalID = INPUT_TERMINAL_ID,
71 .wTerminalType = UAC_TERMINAL_STREAMING,
73 .wChannelConfig = 0x3,
76 DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(0);
78 #define FEATURE_UNIT_ID 2
79 static struct uac_feature_unit_descriptor_0 feature_unit_desc = {
80 .bLength = UAC_DT_FEATURE_UNIT_SIZE(0),
81 .bDescriptorType = USB_DT_CS_INTERFACE,
82 .bDescriptorSubtype = UAC_FEATURE_UNIT,
83 .bUnitID = FEATURE_UNIT_ID,
84 .bSourceID = INPUT_TERMINAL_ID,
86 .bmaControls[0] = (UAC_FU_MUTE | UAC_FU_VOLUME),
89 static struct usb_audio_control mute_control = {
90 .list = LIST_HEAD_INIT(mute_control.list),
91 .name = "Mute Control",
93 /* Todo: add real Mute control code */
94 .set = generic_set_cmd,
95 .get = generic_get_cmd,
98 static struct usb_audio_control volume_control = {
99 .list = LIST_HEAD_INIT(volume_control.list),
100 .name = "Volume Control",
101 .type = UAC_FU_VOLUME,
102 /* Todo: add real Volume control code */
103 .set = generic_set_cmd,
104 .get = generic_get_cmd,
107 static struct usb_audio_control_selector feature_unit = {
108 .list = LIST_HEAD_INIT(feature_unit.list),
109 .id = FEATURE_UNIT_ID,
110 .name = "Mute & Volume Control",
111 .type = UAC_FEATURE_UNIT,
112 .desc = (struct usb_descriptor_header *)&feature_unit_desc,
115 #define OUTPUT_TERMINAL_ID 3
116 static struct uac1_output_terminal_descriptor output_terminal_desc = {
117 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
118 .bDescriptorType = USB_DT_CS_INTERFACE,
119 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
120 .bTerminalID = OUTPUT_TERMINAL_ID,
121 .wTerminalType = UAC_OUTPUT_TERMINAL_SPEAKER,
122 .bAssocTerminal = FEATURE_UNIT_ID,
123 .bSourceID = FEATURE_UNIT_ID,
126 /* B.4.1 Standard AS Interface Descriptor */
127 static struct usb_interface_descriptor as_interface_alt_0_desc = {
128 .bLength = USB_DT_INTERFACE_SIZE,
129 .bDescriptorType = USB_DT_INTERFACE,
130 .bAlternateSetting = 0,
132 .bInterfaceClass = USB_CLASS_AUDIO,
133 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
136 static struct usb_interface_descriptor as_interface_alt_1_desc = {
137 .bLength = USB_DT_INTERFACE_SIZE,
138 .bDescriptorType = USB_DT_INTERFACE,
139 .bAlternateSetting = 1,
141 .bInterfaceClass = USB_CLASS_AUDIO,
142 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
145 /* B.4.2 Class-Specific AS Interface Descriptor */
146 static struct uac1_as_header_descriptor as_header_desc = {
147 .bLength = UAC_DT_AS_HEADER_SIZE,
148 .bDescriptorType = USB_DT_CS_INTERFACE,
149 .bDescriptorSubtype = UAC_AS_GENERAL,
150 .bTerminalLink = INPUT_TERMINAL_ID,
152 .wFormatTag = UAC_FORMAT_TYPE_I_PCM,
155 DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
157 static struct uac_format_type_i_discrete_descriptor_1 as_type_i_desc = {
158 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
159 .bDescriptorType = USB_DT_CS_INTERFACE,
160 .bDescriptorSubtype = UAC_FORMAT_TYPE,
161 .bFormatType = UAC_FORMAT_TYPE_I,
163 .bBitResolution = 16,
167 /* Standard ISO OUT Endpoint Descriptor */
168 static struct usb_endpoint_descriptor as_out_ep_desc = {
169 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
170 .bDescriptorType = USB_DT_ENDPOINT,
171 .bEndpointAddress = USB_DIR_OUT,
172 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
173 | USB_ENDPOINT_XFER_ISOC,
174 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
178 /* Class-specific AS ISO OUT Endpoint Descriptor */
179 static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
180 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
181 .bDescriptorType = USB_DT_CS_ENDPOINT,
182 .bDescriptorSubtype = UAC_EP_GENERAL,
184 .bLockDelayUnits = 1,
185 .wLockDelay = __constant_cpu_to_le16(1),
188 static struct usb_descriptor_header *f_audio_desc[] = {
189 (struct usb_descriptor_header *)&ac_interface_desc,
190 (struct usb_descriptor_header *)&ac_header_desc,
192 (struct usb_descriptor_header *)&input_terminal_desc,
193 (struct usb_descriptor_header *)&output_terminal_desc,
194 (struct usb_descriptor_header *)&feature_unit_desc,
196 (struct usb_descriptor_header *)&as_interface_alt_0_desc,
197 (struct usb_descriptor_header *)&as_interface_alt_1_desc,
198 (struct usb_descriptor_header *)&as_header_desc,
200 (struct usb_descriptor_header *)&as_type_i_desc,
202 (struct usb_descriptor_header *)&as_out_ep_desc,
203 (struct usb_descriptor_header *)&as_iso_out_desc,
210 STR_INPUT_TERMINAL_CH_NAMES,
217 static struct usb_string strings_uac1[] = {
218 [STR_AC_IF].s = "AC Interface",
219 [STR_INPUT_TERMINAL].s = "Input terminal",
220 [STR_INPUT_TERMINAL_CH_NAMES].s = "Channels",
221 [STR_FEAT_DESC_0].s = "Volume control & mute",
222 [STR_OUTPUT_TERMINAL].s = "Output terminal",
223 [STR_AS_IF_ALT0].s = "AS Interface",
224 [STR_AS_IF_ALT1].s = "AS Interface",
228 static struct usb_gadget_strings str_uac1 = {
229 .language = 0x0409, /* en-us */
230 .strings = strings_uac1,
233 static struct usb_gadget_strings *uac1_strings[] = {
239 * This function is an ALSA sound card following USB Audio Class Spec 1.0.
242 /*-------------------------------------------------------------------------*/
246 struct list_head list;
249 static struct f_audio_buf *f_audio_buffer_alloc(int buf_size)
251 struct f_audio_buf *copy_buf;
253 copy_buf = kzalloc(sizeof *copy_buf, GFP_ATOMIC);
255 return ERR_PTR(-ENOMEM);
257 copy_buf->buf = kzalloc(buf_size, GFP_ATOMIC);
258 if (!copy_buf->buf) {
260 return ERR_PTR(-ENOMEM);
266 static void f_audio_buffer_free(struct f_audio_buf *audio_buf)
268 kfree(audio_buf->buf);
271 /*-------------------------------------------------------------------------*/
276 /* endpoints handle full and/or high speeds */
277 struct usb_ep *out_ep;
280 struct f_audio_buf *copy_buf;
281 struct work_struct playback_work;
282 struct list_head play_queue;
284 /* Control Set command */
287 struct usb_audio_control *set_con;
290 static inline struct f_audio *func_to_audio(struct usb_function *f)
292 return container_of(f, struct f_audio, card.func);
295 /*-------------------------------------------------------------------------*/
297 static void f_audio_playback_work(struct work_struct *data)
299 struct f_audio *audio = container_of(data, struct f_audio,
301 struct f_audio_buf *play_buf;
303 spin_lock_irq(&audio->lock);
304 if (list_empty(&audio->play_queue)) {
305 spin_unlock_irq(&audio->lock);
308 play_buf = list_first_entry(&audio->play_queue,
309 struct f_audio_buf, list);
310 list_del(&play_buf->list);
311 spin_unlock_irq(&audio->lock);
313 u_audio_playback(&audio->card, play_buf->buf, play_buf->actual);
314 f_audio_buffer_free(play_buf);
317 static int f_audio_out_ep_complete(struct usb_ep *ep, struct usb_request *req)
319 struct f_audio *audio = req->context;
320 struct usb_composite_dev *cdev = audio->card.func.config->cdev;
321 struct f_audio_buf *copy_buf = audio->copy_buf;
322 struct f_uac1_opts *opts;
326 opts = container_of(audio->card.func.fi, struct f_uac1_opts,
328 audio_buf_size = opts->audio_buf_size;
333 /* Copy buffer is full, add it to the play_queue */
334 if (audio_buf_size - copy_buf->actual < req->actual) {
335 list_add_tail(©_buf->list, &audio->play_queue);
336 schedule_work(&audio->playback_work);
337 copy_buf = f_audio_buffer_alloc(audio_buf_size);
338 if (IS_ERR(copy_buf))
342 memcpy(copy_buf->buf + copy_buf->actual, req->buf, req->actual);
343 copy_buf->actual += req->actual;
344 audio->copy_buf = copy_buf;
346 err = usb_ep_queue(ep, req, GFP_ATOMIC);
348 ERROR(cdev, "%s queue req: %d\n", ep->name, err);
354 static void f_audio_complete(struct usb_ep *ep, struct usb_request *req)
356 struct f_audio *audio = req->context;
357 int status = req->status;
359 struct usb_ep *out_ep = audio->out_ep;
363 case 0: /* normal completion? */
365 f_audio_out_ep_complete(ep, req);
366 else if (audio->set_con) {
367 memcpy(&data, req->buf, req->length);
368 audio->set_con->set(audio->set_con, audio->set_cmd,
370 audio->set_con = NULL;
378 static int audio_set_intf_req(struct usb_function *f,
379 const struct usb_ctrlrequest *ctrl)
381 struct f_audio *audio = func_to_audio(f);
382 struct usb_composite_dev *cdev = f->config->cdev;
383 struct usb_request *req = cdev->req;
384 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
385 u16 len = le16_to_cpu(ctrl->wLength);
386 u16 w_value = le16_to_cpu(ctrl->wValue);
387 u8 con_sel = (w_value >> 8) & 0xFF;
388 u8 cmd = (ctrl->bRequest & 0x0F);
389 struct usb_audio_control_selector *cs;
390 struct usb_audio_control *con;
392 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
393 ctrl->bRequest, w_value, len, id);
395 list_for_each_entry(cs, &audio->cs, list) {
397 list_for_each_entry(con, &cs->control, list) {
398 if (con->type == con_sel) {
399 audio->set_con = con;
407 audio->set_cmd = cmd;
408 req->context = audio;
409 req->complete = f_audio_complete;
414 static int audio_get_intf_req(struct usb_function *f,
415 const struct usb_ctrlrequest *ctrl)
417 struct f_audio *audio = func_to_audio(f);
418 struct usb_composite_dev *cdev = f->config->cdev;
419 struct usb_request *req = cdev->req;
420 int value = -EOPNOTSUPP;
421 u8 id = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
422 u16 len = le16_to_cpu(ctrl->wLength);
423 u16 w_value = le16_to_cpu(ctrl->wValue);
424 u8 con_sel = (w_value >> 8) & 0xFF;
425 u8 cmd = (ctrl->bRequest & 0x0F);
426 struct usb_audio_control_selector *cs;
427 struct usb_audio_control *con;
429 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, entity %d\n",
430 ctrl->bRequest, w_value, len, id);
432 list_for_each_entry(cs, &audio->cs, list) {
434 list_for_each_entry(con, &cs->control, list) {
435 if (con->type == con_sel && con->get) {
436 value = con->get(con, cmd);
444 req->context = audio;
445 req->complete = f_audio_complete;
446 len = min_t(size_t, sizeof(value), len);
447 memcpy(req->buf, &value, len);
452 static int audio_set_endpoint_req(struct usb_function *f,
453 const struct usb_ctrlrequest *ctrl)
455 struct usb_composite_dev *cdev = f->config->cdev;
456 int value = -EOPNOTSUPP;
457 u16 ep = le16_to_cpu(ctrl->wIndex);
458 u16 len = le16_to_cpu(ctrl->wLength);
459 u16 w_value = le16_to_cpu(ctrl->wValue);
461 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
462 ctrl->bRequest, w_value, len, ep);
464 switch (ctrl->bRequest) {
488 static int audio_get_endpoint_req(struct usb_function *f,
489 const struct usb_ctrlrequest *ctrl)
491 struct usb_composite_dev *cdev = f->config->cdev;
492 int value = -EOPNOTSUPP;
493 u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
494 u16 len = le16_to_cpu(ctrl->wLength);
495 u16 w_value = le16_to_cpu(ctrl->wValue);
497 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
498 ctrl->bRequest, w_value, len, ep);
500 switch (ctrl->bRequest) {
517 f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
519 struct usb_composite_dev *cdev = f->config->cdev;
520 struct usb_request *req = cdev->req;
521 int value = -EOPNOTSUPP;
522 u16 w_index = le16_to_cpu(ctrl->wIndex);
523 u16 w_value = le16_to_cpu(ctrl->wValue);
524 u16 w_length = le16_to_cpu(ctrl->wLength);
526 /* composite driver infrastructure handles everything; interface
527 * activation uses set_alt().
529 switch (ctrl->bRequestType) {
530 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
531 value = audio_set_intf_req(f, ctrl);
534 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE:
535 value = audio_get_intf_req(f, ctrl);
538 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
539 value = audio_set_endpoint_req(f, ctrl);
542 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
543 value = audio_get_endpoint_req(f, ctrl);
547 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
548 ctrl->bRequestType, ctrl->bRequest,
549 w_value, w_index, w_length);
552 /* respond with data transfer or status phase? */
554 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
555 ctrl->bRequestType, ctrl->bRequest,
556 w_value, w_index, w_length);
559 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
561 ERROR(cdev, "audio response on err %d\n", value);
564 /* device either stalls (value < 0) or reports success */
568 static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
570 struct f_audio *audio = func_to_audio(f);
571 struct usb_composite_dev *cdev = f->config->cdev;
572 struct usb_ep *out_ep = audio->out_ep;
573 struct usb_request *req;
574 struct f_uac1_opts *opts;
575 int req_buf_size, req_count, audio_buf_size;
578 DBG(cdev, "intf %d, alt %d\n", intf, alt);
580 opts = container_of(f->fi, struct f_uac1_opts, func_inst);
581 req_buf_size = opts->req_buf_size;
582 req_count = opts->req_count;
583 audio_buf_size = opts->audio_buf_size;
587 usb_ep_enable(out_ep);
588 out_ep->driver_data = audio;
589 audio->copy_buf = f_audio_buffer_alloc(audio_buf_size);
590 if (IS_ERR(audio->copy_buf))
594 * allocate a bunch of read buffers
595 * and queue them all at once.
597 for (i = 0; i < req_count && err == 0; i++) {
598 req = usb_ep_alloc_request(out_ep, GFP_ATOMIC);
600 req->buf = kzalloc(req_buf_size,
603 req->length = req_buf_size;
604 req->context = audio;
607 err = usb_ep_queue(out_ep,
611 "%s queue req: %d\n",
620 struct f_audio_buf *copy_buf = audio->copy_buf;
622 list_add_tail(©_buf->list,
624 schedule_work(&audio->playback_work);
632 static void f_audio_disable(struct usb_function *f)
637 /*-------------------------------------------------------------------------*/
639 static void f_audio_build_desc(struct f_audio *audio)
641 struct gaudio *card = &audio->card;
645 /* Set channel numbers */
646 input_terminal_desc.bNrChannels = u_audio_get_playback_channels(card);
647 as_type_i_desc.bNrChannels = u_audio_get_playback_channels(card);
649 /* Set sample rates */
650 rate = u_audio_get_playback_rate(card);
651 sam_freq = as_type_i_desc.tSamFreq[0];
652 memcpy(sam_freq, &rate, 3);
654 /* Todo: Set Sample bits and other parameters */
659 /* audio function driver setup/binding */
661 f_audio_bind(struct usb_configuration *c, struct usb_function *f)
663 struct usb_composite_dev *cdev = c->cdev;
664 struct f_audio *audio = func_to_audio(f);
665 struct usb_string *us;
667 struct usb_ep *ep = NULL;
668 struct f_uac1_opts *audio_opts;
670 audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst);
671 audio->card.gadget = c->cdev->gadget;
672 audio_opts->card = &audio->card;
673 /* set up ASLA audio devices */
674 if (!audio_opts->bound) {
675 status = gaudio_setup(&audio->card);
678 audio_opts->bound = true;
680 us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
683 ac_interface_desc.iInterface = us[STR_AC_IF].id;
684 input_terminal_desc.iTerminal = us[STR_INPUT_TERMINAL].id;
685 input_terminal_desc.iChannelNames = us[STR_INPUT_TERMINAL_CH_NAMES].id;
686 feature_unit_desc.iFeature = us[STR_FEAT_DESC_0].id;
687 output_terminal_desc.iTerminal = us[STR_OUTPUT_TERMINAL].id;
688 as_interface_alt_0_desc.iInterface = us[STR_AS_IF_ALT0].id;
689 as_interface_alt_1_desc.iInterface = us[STR_AS_IF_ALT1].id;
692 f_audio_build_desc(audio);
694 /* allocate instance-specific interface IDs, and patch descriptors */
695 status = usb_interface_id(c, f);
698 ac_interface_desc.bInterfaceNumber = status;
700 status = usb_interface_id(c, f);
703 as_interface_alt_0_desc.bInterfaceNumber = status;
704 as_interface_alt_1_desc.bInterfaceNumber = status;
708 /* allocate instance-specific endpoints */
709 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
713 audio->out_ep->desc = &as_out_ep_desc;
714 ep->driver_data = cdev; /* claim */
718 /* copy descriptors, and track endpoint copies */
719 status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL);
725 gaudio_cleanup(&audio->card);
727 ep->driver_data = NULL;
731 /*-------------------------------------------------------------------------*/
733 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value)
735 con->data[cmd] = value;
740 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd)
742 return con->data[cmd];
745 /* Todo: add more control selecotor dynamically */
746 static int control_selector_init(struct f_audio *audio)
748 INIT_LIST_HEAD(&audio->cs);
749 list_add(&feature_unit.list, &audio->cs);
751 INIT_LIST_HEAD(&feature_unit.control);
752 list_add(&mute_control.list, &feature_unit.control);
753 list_add(&volume_control.list, &feature_unit.control);
755 volume_control.data[UAC__CUR] = 0xffc0;
756 volume_control.data[UAC__MIN] = 0xe3a0;
757 volume_control.data[UAC__MAX] = 0xfff0;
758 volume_control.data[UAC__RES] = 0x0030;
763 static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item)
765 return container_of(to_config_group(item), struct f_uac1_opts,
769 CONFIGFS_ATTR_STRUCT(f_uac1_opts);
770 CONFIGFS_ATTR_OPS(f_uac1_opts);
772 static void f_uac1_attr_release(struct config_item *item)
774 struct f_uac1_opts *opts = to_f_uac1_opts(item);
776 usb_put_function_instance(&opts->func_inst);
779 static struct configfs_item_operations f_uac1_item_ops = {
780 .release = f_uac1_attr_release,
781 .show_attribute = f_uac1_opts_attr_show,
782 .store_attribute = f_uac1_opts_attr_store,
785 #define UAC1_INT_ATTRIBUTE(name) \
786 static ssize_t f_uac1_opts_##name##_show(struct f_uac1_opts *opts, \
791 mutex_lock(&opts->lock); \
792 result = sprintf(page, "%u\n", opts->name); \
793 mutex_unlock(&opts->lock); \
798 static ssize_t f_uac1_opts_##name##_store(struct f_uac1_opts *opts, \
799 const char *page, size_t len) \
804 mutex_lock(&opts->lock); \
805 if (opts->refcnt) { \
810 ret = kstrtou32(page, 0, &num); \
818 mutex_unlock(&opts->lock); \
822 static struct f_uac1_opts_attribute f_uac1_opts_##name = \
823 __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
824 f_uac1_opts_##name##_show, \
825 f_uac1_opts_##name##_store)
827 UAC1_INT_ATTRIBUTE(req_buf_size);
828 UAC1_INT_ATTRIBUTE(req_count);
829 UAC1_INT_ATTRIBUTE(audio_buf_size);
831 #define UAC1_STR_ATTRIBUTE(name) \
832 static ssize_t f_uac1_opts_##name##_show(struct f_uac1_opts *opts, \
837 mutex_lock(&opts->lock); \
838 result = sprintf(page, "%s\n", opts->name); \
839 mutex_unlock(&opts->lock); \
844 static ssize_t f_uac1_opts_##name##_store(struct f_uac1_opts *opts, \
845 const char *page, size_t len) \
850 mutex_lock(&opts->lock); \
854 tmp = kstrndup(page, len, GFP_KERNEL); \
859 if (opts->name##_alloc) \
861 opts->name##_alloc = true; \
866 mutex_unlock(&opts->lock); \
870 static struct f_uac1_opts_attribute f_uac1_opts_##name = \
871 __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, \
872 f_uac1_opts_##name##_show, \
873 f_uac1_opts_##name##_store)
875 UAC1_STR_ATTRIBUTE(fn_play);
876 UAC1_STR_ATTRIBUTE(fn_cap);
877 UAC1_STR_ATTRIBUTE(fn_cntl);
879 static struct configfs_attribute *f_uac1_attrs[] = {
880 &f_uac1_opts_req_buf_size.attr,
881 &f_uac1_opts_req_count.attr,
882 &f_uac1_opts_audio_buf_size.attr,
883 &f_uac1_opts_fn_play.attr,
884 &f_uac1_opts_fn_cap.attr,
885 &f_uac1_opts_fn_cntl.attr,
889 static struct config_item_type f_uac1_func_type = {
890 .ct_item_ops = &f_uac1_item_ops,
891 .ct_attrs = f_uac1_attrs,
892 .ct_owner = THIS_MODULE,
895 static void f_audio_free_inst(struct usb_function_instance *f)
897 struct f_uac1_opts *opts;
899 opts = container_of(f, struct f_uac1_opts, func_inst);
900 gaudio_cleanup(opts->card);
901 if (opts->fn_play_alloc)
902 kfree(opts->fn_play);
903 if (opts->fn_cap_alloc)
905 if (opts->fn_cntl_alloc)
906 kfree(opts->fn_cntl);
910 static struct usb_function_instance *f_audio_alloc_inst(void)
912 struct f_uac1_opts *opts;
914 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
916 return ERR_PTR(-ENOMEM);
918 mutex_init(&opts->lock);
919 opts->func_inst.free_func_inst = f_audio_free_inst;
921 config_group_init_type_name(&opts->func_inst.group, "",
924 opts->req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE;
925 opts->req_count = UAC1_REQ_COUNT;
926 opts->audio_buf_size = UAC1_AUDIO_BUF_SIZE;
927 opts->fn_play = FILE_PCM_PLAYBACK;
928 opts->fn_cap = FILE_PCM_CAPTURE;
929 opts->fn_cntl = FILE_CONTROL;
930 return &opts->func_inst;
933 static void f_audio_free(struct usb_function *f)
935 struct f_audio *audio = func_to_audio(f);
936 struct f_uac1_opts *opts;
938 opts = container_of(f->fi, struct f_uac1_opts, func_inst);
940 mutex_lock(&opts->lock);
942 mutex_unlock(&opts->lock);
945 static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
947 usb_free_all_descriptors(f);
950 static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
952 struct f_audio *audio;
953 struct f_uac1_opts *opts;
955 /* allocate and initialize one new instance */
956 audio = kzalloc(sizeof(*audio), GFP_KERNEL);
958 return ERR_PTR(-ENOMEM);
960 audio->card.func.name = "g_audio";
962 opts = container_of(fi, struct f_uac1_opts, func_inst);
963 mutex_lock(&opts->lock);
965 mutex_unlock(&opts->lock);
966 INIT_LIST_HEAD(&audio->play_queue);
967 spin_lock_init(&audio->lock);
969 audio->card.func.bind = f_audio_bind;
970 audio->card.func.unbind = f_audio_unbind;
971 audio->card.func.set_alt = f_audio_set_alt;
972 audio->card.func.setup = f_audio_setup;
973 audio->card.func.disable = f_audio_disable;
974 audio->card.func.free_func = f_audio_free;
976 control_selector_init(audio);
978 INIT_WORK(&audio->playback_work, f_audio_playback_work);
980 return &audio->card.func;
983 DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc);
984 MODULE_LICENSE("GPL");
985 MODULE_AUTHOR("Bryan Wu");