2 * f_uac1.c -- USB Audio Class 1.0 Function (using u_audio API)
4 * Copyright (C) 2016 Ruslan Bilovol <ruslan.bilovol@gmail.com>
6 * This driver doesn't expect any real Audio codec to be present
7 * on the device - the audio streams are simply sinked to and
8 * sourced from a virtual ALSA sound card created.
10 * This file is based on f_uac1.c which is
11 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
12 * Copyright (C) 2008 Analog Devices, Inc
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
20 #include <linux/usb/audio.h>
21 #include <linux/module.h>
26 /* UAC1 spec: 3.7.2.3 Audio Channel Cluster Format */
27 #define UAC1_CHANNEL_MASK 0x0FFF
30 struct g_audio g_audio;
31 u8 ac_intf, as_in_intf, as_out_intf;
32 u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */
35 static inline struct f_uac1 *func_to_uac1(struct usb_function *f)
37 return container_of(f, struct f_uac1, g_audio.func);
40 static inline struct f_uac1_opts *g_audio_to_uac1_opts(struct g_audio *audio)
42 return container_of(audio->func.fi, struct f_uac1_opts, func_inst);
46 * DESCRIPTORS ... most are static, but strings and full
47 * configuration descriptors are built on demand.
51 * We have three interfaces - one AudioControl and two AudioStreaming
53 * The driver implements a simple UAC_1 topology.
54 * USB-OUT -> IT_1 -> OT_2 -> ALSA_Capture
55 * ALSA_Playback -> IT_3 -> OT_4 -> USB-IN
57 #define F_AUDIO_AC_INTERFACE 0
58 #define F_AUDIO_AS_OUT_INTERFACE 1
59 #define F_AUDIO_AS_IN_INTERFACE 2
60 /* Number of streaming interfaces */
61 #define F_AUDIO_NUM_INTERFACES 2
63 /* B.3.1 Standard AC Interface Descriptor */
64 static struct usb_interface_descriptor ac_interface_desc = {
65 .bLength = USB_DT_INTERFACE_SIZE,
66 .bDescriptorType = USB_DT_INTERFACE,
68 .bInterfaceClass = USB_CLASS_AUDIO,
69 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
73 * The number of AudioStreaming and MIDIStreaming interfaces
74 * in the Audio Interface Collection
76 DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
78 #define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
79 /* 2 input terminals and 2 output terminals */
80 #define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH \
81 + 2*UAC_DT_INPUT_TERMINAL_SIZE + 2*UAC_DT_OUTPUT_TERMINAL_SIZE)
82 /* B.3.2 Class-Specific AC Interface Descriptor */
83 static struct uac1_ac_header_descriptor_2 ac_header_desc = {
84 .bLength = UAC_DT_AC_HEADER_LENGTH,
85 .bDescriptorType = USB_DT_CS_INTERFACE,
86 .bDescriptorSubtype = UAC_HEADER,
87 .bcdADC = cpu_to_le16(0x0100),
88 .wTotalLength = cpu_to_le16(UAC_DT_TOTAL_LENGTH),
89 .bInCollection = F_AUDIO_NUM_INTERFACES,
91 /* Interface number of the AudioStream interfaces */
97 #define USB_OUT_IT_ID 1
98 static struct uac_input_terminal_descriptor usb_out_it_desc = {
99 .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
100 .bDescriptorType = USB_DT_CS_INTERFACE,
101 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
102 .bTerminalID = USB_OUT_IT_ID,
103 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
105 .wChannelConfig = cpu_to_le16(0x3),
108 #define IO_OUT_OT_ID 2
109 static struct uac1_output_terminal_descriptor io_out_ot_desc = {
110 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
111 .bDescriptorType = USB_DT_CS_INTERFACE,
112 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
113 .bTerminalID = IO_OUT_OT_ID,
114 .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_SPEAKER),
116 .bSourceID = USB_OUT_IT_ID,
119 #define IO_IN_IT_ID 3
120 static struct uac_input_terminal_descriptor io_in_it_desc = {
121 .bLength = UAC_DT_INPUT_TERMINAL_SIZE,
122 .bDescriptorType = USB_DT_CS_INTERFACE,
123 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
124 .bTerminalID = IO_IN_IT_ID,
125 .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_MICROPHONE),
127 .wChannelConfig = cpu_to_le16(0x3),
130 #define USB_IN_OT_ID 4
131 static struct uac1_output_terminal_descriptor usb_in_ot_desc = {
132 .bLength = UAC_DT_OUTPUT_TERMINAL_SIZE,
133 .bDescriptorType = USB_DT_CS_INTERFACE,
134 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
135 .bTerminalID = USB_IN_OT_ID,
136 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
138 .bSourceID = IO_IN_IT_ID,
141 /* B.4.1 Standard AS Interface Descriptor */
142 static struct usb_interface_descriptor as_out_interface_alt_0_desc = {
143 .bLength = USB_DT_INTERFACE_SIZE,
144 .bDescriptorType = USB_DT_INTERFACE,
145 .bAlternateSetting = 0,
147 .bInterfaceClass = USB_CLASS_AUDIO,
148 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
151 static struct usb_interface_descriptor as_out_interface_alt_1_desc = {
152 .bLength = USB_DT_INTERFACE_SIZE,
153 .bDescriptorType = USB_DT_INTERFACE,
154 .bAlternateSetting = 1,
156 .bInterfaceClass = USB_CLASS_AUDIO,
157 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
160 static struct usb_interface_descriptor as_in_interface_alt_0_desc = {
161 .bLength = USB_DT_INTERFACE_SIZE,
162 .bDescriptorType = USB_DT_INTERFACE,
163 .bAlternateSetting = 0,
165 .bInterfaceClass = USB_CLASS_AUDIO,
166 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
169 static struct usb_interface_descriptor as_in_interface_alt_1_desc = {
170 .bLength = USB_DT_INTERFACE_SIZE,
171 .bDescriptorType = USB_DT_INTERFACE,
172 .bAlternateSetting = 1,
174 .bInterfaceClass = USB_CLASS_AUDIO,
175 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
178 /* B.4.2 Class-Specific AS Interface Descriptor */
179 static struct uac1_as_header_descriptor as_out_header_desc = {
180 .bLength = UAC_DT_AS_HEADER_SIZE,
181 .bDescriptorType = USB_DT_CS_INTERFACE,
182 .bDescriptorSubtype = UAC_AS_GENERAL,
183 .bTerminalLink = USB_OUT_IT_ID,
185 .wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM),
188 static struct uac1_as_header_descriptor as_in_header_desc = {
189 .bLength = UAC_DT_AS_HEADER_SIZE,
190 .bDescriptorType = USB_DT_CS_INTERFACE,
191 .bDescriptorSubtype = UAC_AS_GENERAL,
192 .bTerminalLink = USB_IN_OT_ID,
194 .wFormatTag = cpu_to_le16(UAC_FORMAT_TYPE_I_PCM),
197 DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
199 static struct uac_format_type_i_discrete_descriptor_1 as_out_type_i_desc = {
200 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
201 .bDescriptorType = USB_DT_CS_INTERFACE,
202 .bDescriptorSubtype = UAC_FORMAT_TYPE,
203 .bFormatType = UAC_FORMAT_TYPE_I,
205 .bBitResolution = 16,
209 /* Standard ISO OUT Endpoint Descriptor */
210 static struct usb_endpoint_descriptor as_out_ep_desc = {
211 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
212 .bDescriptorType = USB_DT_ENDPOINT,
213 .bEndpointAddress = USB_DIR_OUT,
214 .bmAttributes = USB_ENDPOINT_SYNC_ADAPTIVE
215 | USB_ENDPOINT_XFER_ISOC,
216 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
220 /* Class-specific AS ISO OUT Endpoint Descriptor */
221 static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
222 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
223 .bDescriptorType = USB_DT_CS_ENDPOINT,
224 .bDescriptorSubtype = UAC_EP_GENERAL,
226 .bLockDelayUnits = 1,
227 .wLockDelay = cpu_to_le16(1),
230 static struct uac_format_type_i_discrete_descriptor_1 as_in_type_i_desc = {
231 .bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
232 .bDescriptorType = USB_DT_CS_INTERFACE,
233 .bDescriptorSubtype = UAC_FORMAT_TYPE,
234 .bFormatType = UAC_FORMAT_TYPE_I,
236 .bBitResolution = 16,
240 /* Standard ISO OUT Endpoint Descriptor */
241 static struct usb_endpoint_descriptor as_in_ep_desc = {
242 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
243 .bDescriptorType = USB_DT_ENDPOINT,
244 .bEndpointAddress = USB_DIR_IN,
245 .bmAttributes = USB_ENDPOINT_SYNC_ASYNC
246 | USB_ENDPOINT_XFER_ISOC,
247 .wMaxPacketSize = cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
251 /* Class-specific AS ISO OUT Endpoint Descriptor */
252 static struct uac_iso_endpoint_descriptor as_iso_in_desc = {
253 .bLength = UAC_ISO_ENDPOINT_DESC_SIZE,
254 .bDescriptorType = USB_DT_CS_ENDPOINT,
255 .bDescriptorSubtype = UAC_EP_GENERAL,
257 .bLockDelayUnits = 0,
261 static struct usb_descriptor_header *f_audio_desc[] = {
262 (struct usb_descriptor_header *)&ac_interface_desc,
263 (struct usb_descriptor_header *)&ac_header_desc,
265 (struct usb_descriptor_header *)&usb_out_it_desc,
266 (struct usb_descriptor_header *)&io_out_ot_desc,
267 (struct usb_descriptor_header *)&io_in_it_desc,
268 (struct usb_descriptor_header *)&usb_in_ot_desc,
270 (struct usb_descriptor_header *)&as_out_interface_alt_0_desc,
271 (struct usb_descriptor_header *)&as_out_interface_alt_1_desc,
272 (struct usb_descriptor_header *)&as_out_header_desc,
274 (struct usb_descriptor_header *)&as_out_type_i_desc,
276 (struct usb_descriptor_header *)&as_out_ep_desc,
277 (struct usb_descriptor_header *)&as_iso_out_desc,
279 (struct usb_descriptor_header *)&as_in_interface_alt_0_desc,
280 (struct usb_descriptor_header *)&as_in_interface_alt_1_desc,
281 (struct usb_descriptor_header *)&as_in_header_desc,
283 (struct usb_descriptor_header *)&as_in_type_i_desc,
285 (struct usb_descriptor_header *)&as_in_ep_desc,
286 (struct usb_descriptor_header *)&as_iso_in_desc,
293 STR_USB_OUT_IT_CH_NAMES,
296 STR_IO_IN_IT_CH_NAMES,
304 static struct usb_string strings_uac1[] = {
305 [STR_AC_IF].s = "AC Interface",
306 [STR_USB_OUT_IT].s = "Playback Input terminal",
307 [STR_USB_OUT_IT_CH_NAMES].s = "Playback Channels",
308 [STR_IO_OUT_OT].s = "Playback Output terminal",
309 [STR_IO_IN_IT].s = "Capture Input terminal",
310 [STR_IO_IN_IT_CH_NAMES].s = "Capture Channels",
311 [STR_USB_IN_OT].s = "Capture Output terminal",
312 [STR_AS_OUT_IF_ALT0].s = "Playback Inactive",
313 [STR_AS_OUT_IF_ALT1].s = "Playback Active",
314 [STR_AS_IN_IF_ALT0].s = "Capture Inactive",
315 [STR_AS_IN_IF_ALT1].s = "Capture Active",
319 static struct usb_gadget_strings str_uac1 = {
320 .language = 0x0409, /* en-us */
321 .strings = strings_uac1,
324 static struct usb_gadget_strings *uac1_strings[] = {
330 * This function is an ALSA sound card following USB Audio Class Spec 1.0.
333 static int audio_set_endpoint_req(struct usb_function *f,
334 const struct usb_ctrlrequest *ctrl)
336 struct usb_composite_dev *cdev = f->config->cdev;
337 int value = -EOPNOTSUPP;
338 u16 ep = le16_to_cpu(ctrl->wIndex);
339 u16 len = le16_to_cpu(ctrl->wLength);
340 u16 w_value = le16_to_cpu(ctrl->wValue);
342 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
343 ctrl->bRequest, w_value, len, ep);
345 switch (ctrl->bRequest) {
369 static int audio_get_endpoint_req(struct usb_function *f,
370 const struct usb_ctrlrequest *ctrl)
372 struct usb_composite_dev *cdev = f->config->cdev;
373 int value = -EOPNOTSUPP;
374 u8 ep = ((le16_to_cpu(ctrl->wIndex) >> 8) & 0xFF);
375 u16 len = le16_to_cpu(ctrl->wLength);
376 u16 w_value = le16_to_cpu(ctrl->wValue);
378 DBG(cdev, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
379 ctrl->bRequest, w_value, len, ep);
381 switch (ctrl->bRequest) {
398 f_audio_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
400 struct usb_composite_dev *cdev = f->config->cdev;
401 struct usb_request *req = cdev->req;
402 int value = -EOPNOTSUPP;
403 u16 w_index = le16_to_cpu(ctrl->wIndex);
404 u16 w_value = le16_to_cpu(ctrl->wValue);
405 u16 w_length = le16_to_cpu(ctrl->wLength);
407 /* composite driver infrastructure handles everything; interface
408 * activation uses set_alt().
410 switch (ctrl->bRequestType) {
411 case USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
412 value = audio_set_endpoint_req(f, ctrl);
415 case USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_ENDPOINT:
416 value = audio_get_endpoint_req(f, ctrl);
420 ERROR(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
421 ctrl->bRequestType, ctrl->bRequest,
422 w_value, w_index, w_length);
425 /* respond with data transfer or status phase? */
427 DBG(cdev, "audio req%02x.%02x v%04x i%04x l%d\n",
428 ctrl->bRequestType, ctrl->bRequest,
429 w_value, w_index, w_length);
432 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
434 ERROR(cdev, "audio response on err %d\n", value);
437 /* device either stalls (value < 0) or reports success */
441 static int f_audio_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
443 struct usb_composite_dev *cdev = f->config->cdev;
444 struct usb_gadget *gadget = cdev->gadget;
445 struct device *dev = &gadget->dev;
446 struct f_uac1 *uac1 = func_to_uac1(f);
449 /* No i/f has more than 2 alt settings */
451 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
455 if (intf == uac1->ac_intf) {
456 /* Control I/f has only 1 AltSetting - 0 */
458 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
464 if (intf == uac1->as_out_intf) {
465 uac1->as_out_alt = alt;
468 ret = u_audio_start_capture(&uac1->g_audio);
470 u_audio_stop_capture(&uac1->g_audio);
471 } else if (intf == uac1->as_in_intf) {
472 uac1->as_in_alt = alt;
475 ret = u_audio_start_playback(&uac1->g_audio);
477 u_audio_stop_playback(&uac1->g_audio);
479 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
486 static int f_audio_get_alt(struct usb_function *f, unsigned intf)
488 struct usb_composite_dev *cdev = f->config->cdev;
489 struct usb_gadget *gadget = cdev->gadget;
490 struct device *dev = &gadget->dev;
491 struct f_uac1 *uac1 = func_to_uac1(f);
493 if (intf == uac1->ac_intf)
495 else if (intf == uac1->as_out_intf)
496 return uac1->as_out_alt;
497 else if (intf == uac1->as_in_intf)
498 return uac1->as_in_alt;
500 dev_err(dev, "%s:%d Invalid Interface %d!\n",
501 __func__, __LINE__, intf);
507 static void f_audio_disable(struct usb_function *f)
509 struct f_uac1 *uac1 = func_to_uac1(f);
511 uac1->as_out_alt = 0;
514 u_audio_stop_playback(&uac1->g_audio);
515 u_audio_stop_capture(&uac1->g_audio);
518 /*-------------------------------------------------------------------------*/
520 static int f_audio_validate_opts(struct g_audio *audio, struct device *dev)
522 struct f_uac1_opts *opts = g_audio_to_uac1_opts(audio);
524 if (!opts->p_chmask && !opts->c_chmask) {
525 dev_err(dev, "Error: no playback and capture channels\n");
527 } else if (opts->p_chmask & ~UAC1_CHANNEL_MASK) {
528 dev_err(dev, "Error: unsupported playback channels mask\n");
530 } else if (opts->c_chmask & ~UAC1_CHANNEL_MASK) {
531 dev_err(dev, "Error: unsupported capture channels mask\n");
533 } else if ((opts->p_ssize < 1) || (opts->p_ssize > 4)) {
534 dev_err(dev, "Error: incorrect playback sample size\n");
536 } else if ((opts->c_ssize < 1) || (opts->c_ssize > 4)) {
537 dev_err(dev, "Error: incorrect capture sample size\n");
539 } else if (!opts->p_srate) {
540 dev_err(dev, "Error: incorrect playback sampling rate\n");
542 } else if (!opts->c_srate) {
543 dev_err(dev, "Error: incorrect capture sampling rate\n");
550 /* audio function driver setup/binding */
551 static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
553 struct usb_composite_dev *cdev = c->cdev;
554 struct usb_gadget *gadget = cdev->gadget;
555 struct device *dev = &gadget->dev;
556 struct f_uac1 *uac1 = func_to_uac1(f);
557 struct g_audio *audio = func_to_g_audio(f);
558 struct f_uac1_opts *audio_opts;
559 struct usb_ep *ep = NULL;
560 struct usb_string *us;
565 status = f_audio_validate_opts(audio, dev);
569 audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst);
571 us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
574 ac_interface_desc.iInterface = us[STR_AC_IF].id;
575 usb_out_it_desc.iTerminal = us[STR_USB_OUT_IT].id;
576 usb_out_it_desc.iChannelNames = us[STR_USB_OUT_IT_CH_NAMES].id;
577 io_out_ot_desc.iTerminal = us[STR_IO_OUT_OT].id;
578 as_out_interface_alt_0_desc.iInterface = us[STR_AS_OUT_IF_ALT0].id;
579 as_out_interface_alt_1_desc.iInterface = us[STR_AS_OUT_IF_ALT1].id;
580 io_in_it_desc.iTerminal = us[STR_IO_IN_IT].id;
581 io_in_it_desc.iChannelNames = us[STR_IO_IN_IT_CH_NAMES].id;
582 usb_in_ot_desc.iTerminal = us[STR_USB_IN_OT].id;
583 as_in_interface_alt_0_desc.iInterface = us[STR_AS_IN_IF_ALT0].id;
584 as_in_interface_alt_1_desc.iInterface = us[STR_AS_IN_IF_ALT1].id;
586 /* Set channel numbers */
587 usb_out_it_desc.bNrChannels = num_channels(audio_opts->c_chmask);
588 usb_out_it_desc.wChannelConfig = cpu_to_le16(audio_opts->c_chmask);
589 as_out_type_i_desc.bNrChannels = num_channels(audio_opts->c_chmask);
590 as_out_type_i_desc.bSubframeSize = audio_opts->c_ssize;
591 as_out_type_i_desc.bBitResolution = audio_opts->c_ssize * 8;
592 io_in_it_desc.bNrChannels = num_channels(audio_opts->p_chmask);
593 io_in_it_desc.wChannelConfig = cpu_to_le16(audio_opts->p_chmask);
594 as_in_type_i_desc.bNrChannels = num_channels(audio_opts->p_chmask);
595 as_in_type_i_desc.bSubframeSize = audio_opts->p_ssize;
596 as_in_type_i_desc.bBitResolution = audio_opts->p_ssize * 8;
598 /* Set sample rates */
599 rate = audio_opts->c_srate;
600 sam_freq = as_out_type_i_desc.tSamFreq[0];
601 memcpy(sam_freq, &rate, 3);
602 rate = audio_opts->p_srate;
603 sam_freq = as_in_type_i_desc.tSamFreq[0];
604 memcpy(sam_freq, &rate, 3);
606 /* allocate instance-specific interface IDs, and patch descriptors */
607 status = usb_interface_id(c, f);
610 ac_interface_desc.bInterfaceNumber = status;
611 uac1->ac_intf = status;
614 status = usb_interface_id(c, f);
617 as_out_interface_alt_0_desc.bInterfaceNumber = status;
618 as_out_interface_alt_1_desc.bInterfaceNumber = status;
619 uac1->as_out_intf = status;
620 uac1->as_out_alt = 0;
622 status = usb_interface_id(c, f);
625 as_in_interface_alt_0_desc.bInterfaceNumber = status;
626 as_in_interface_alt_1_desc.bInterfaceNumber = status;
627 uac1->as_in_intf = status;
630 audio->gadget = gadget;
634 /* allocate instance-specific endpoints */
635 ep = usb_ep_autoconfig(cdev->gadget, &as_out_ep_desc);
639 audio->out_ep->desc = &as_out_ep_desc;
641 ep = usb_ep_autoconfig(cdev->gadget, &as_in_ep_desc);
645 audio->in_ep->desc = &as_in_ep_desc;
647 /* copy descriptors, and track endpoint copies */
648 status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL,
653 audio->out_ep_maxpsize = le16_to_cpu(as_out_ep_desc.wMaxPacketSize);
654 audio->in_ep_maxpsize = le16_to_cpu(as_in_ep_desc.wMaxPacketSize);
655 audio->params.c_chmask = audio_opts->c_chmask;
656 audio->params.c_srate = audio_opts->c_srate;
657 audio->params.c_ssize = audio_opts->c_ssize;
658 audio->params.p_chmask = audio_opts->p_chmask;
659 audio->params.p_srate = audio_opts->p_srate;
660 audio->params.p_ssize = audio_opts->p_ssize;
661 audio->params.req_number = audio_opts->req_number;
663 status = g_audio_setup(audio, "UAC1_PCM", "UAC1_Gadget");
665 goto err_card_register;
670 usb_free_all_descriptors(f);
675 /*-------------------------------------------------------------------------*/
677 static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item)
679 return container_of(to_config_group(item), struct f_uac1_opts,
683 static void f_uac1_attr_release(struct config_item *item)
685 struct f_uac1_opts *opts = to_f_uac1_opts(item);
687 usb_put_function_instance(&opts->func_inst);
690 static struct configfs_item_operations f_uac1_item_ops = {
691 .release = f_uac1_attr_release,
694 #define UAC1_ATTRIBUTE(name) \
695 static ssize_t f_uac1_opts_##name##_show( \
696 struct config_item *item, \
699 struct f_uac1_opts *opts = to_f_uac1_opts(item); \
702 mutex_lock(&opts->lock); \
703 result = sprintf(page, "%u\n", opts->name); \
704 mutex_unlock(&opts->lock); \
709 static ssize_t f_uac1_opts_##name##_store( \
710 struct config_item *item, \
711 const char *page, size_t len) \
713 struct f_uac1_opts *opts = to_f_uac1_opts(item); \
717 mutex_lock(&opts->lock); \
718 if (opts->refcnt) { \
723 ret = kstrtou32(page, 0, &num); \
731 mutex_unlock(&opts->lock); \
735 CONFIGFS_ATTR(f_uac1_opts_, name)
737 UAC1_ATTRIBUTE(c_chmask);
738 UAC1_ATTRIBUTE(c_srate);
739 UAC1_ATTRIBUTE(c_ssize);
740 UAC1_ATTRIBUTE(p_chmask);
741 UAC1_ATTRIBUTE(p_srate);
742 UAC1_ATTRIBUTE(p_ssize);
743 UAC1_ATTRIBUTE(req_number);
745 static struct configfs_attribute *f_uac1_attrs[] = {
746 &f_uac1_opts_attr_c_chmask,
747 &f_uac1_opts_attr_c_srate,
748 &f_uac1_opts_attr_c_ssize,
749 &f_uac1_opts_attr_p_chmask,
750 &f_uac1_opts_attr_p_srate,
751 &f_uac1_opts_attr_p_ssize,
752 &f_uac1_opts_attr_req_number,
756 static struct config_item_type f_uac1_func_type = {
757 .ct_item_ops = &f_uac1_item_ops,
758 .ct_attrs = f_uac1_attrs,
759 .ct_owner = THIS_MODULE,
762 static void f_audio_free_inst(struct usb_function_instance *f)
764 struct f_uac1_opts *opts;
766 opts = container_of(f, struct f_uac1_opts, func_inst);
770 static struct usb_function_instance *f_audio_alloc_inst(void)
772 struct f_uac1_opts *opts;
774 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
776 return ERR_PTR(-ENOMEM);
778 mutex_init(&opts->lock);
779 opts->func_inst.free_func_inst = f_audio_free_inst;
781 config_group_init_type_name(&opts->func_inst.group, "",
784 opts->c_chmask = UAC1_DEF_CCHMASK;
785 opts->c_srate = UAC1_DEF_CSRATE;
786 opts->c_ssize = UAC1_DEF_CSSIZE;
787 opts->p_chmask = UAC1_DEF_PCHMASK;
788 opts->p_srate = UAC1_DEF_PSRATE;
789 opts->p_ssize = UAC1_DEF_PSSIZE;
790 opts->req_number = UAC1_DEF_REQ_NUM;
791 return &opts->func_inst;
794 static void f_audio_free(struct usb_function *f)
796 struct g_audio *audio;
797 struct f_uac1_opts *opts;
799 audio = func_to_g_audio(f);
800 opts = container_of(f->fi, struct f_uac1_opts, func_inst);
802 mutex_lock(&opts->lock);
804 mutex_unlock(&opts->lock);
807 static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
809 struct g_audio *audio = func_to_g_audio(f);
811 g_audio_cleanup(audio);
812 usb_free_all_descriptors(f);
814 audio->gadget = NULL;
817 static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
820 struct f_uac1_opts *opts;
822 /* allocate and initialize one new instance */
823 uac1 = kzalloc(sizeof(*uac1), GFP_KERNEL);
825 return ERR_PTR(-ENOMEM);
827 opts = container_of(fi, struct f_uac1_opts, func_inst);
828 mutex_lock(&opts->lock);
830 mutex_unlock(&opts->lock);
832 uac1->g_audio.func.name = "uac1_func";
833 uac1->g_audio.func.bind = f_audio_bind;
834 uac1->g_audio.func.unbind = f_audio_unbind;
835 uac1->g_audio.func.set_alt = f_audio_set_alt;
836 uac1->g_audio.func.get_alt = f_audio_get_alt;
837 uac1->g_audio.func.setup = f_audio_setup;
838 uac1->g_audio.func.disable = f_audio_disable;
839 uac1->g_audio.func.free_func = f_audio_free;
841 return &uac1->g_audio.func;
844 DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc);
845 MODULE_LICENSE("GPL");
846 MODULE_AUTHOR("Ruslan Bilovol");