2 * f_uac2.c -- USB Audio Class 2.0 Function
5 * Yadwinder Singh (yadi.brar01@gmail.com)
6 * Jaswinder Singh (jaswinder.singh@linaro.org)
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
14 #include <linux/usb/audio.h>
15 #include <linux/usb/audio-v2.h>
16 #include <linux/module.h>
22 * The driver implements a simple UAC_2 topology.
23 * USB-OUT -> IT_1 -> OT_3 -> ALSA_Capture
24 * ALSA_Playback -> IT_2 -> OT_4 -> USB-IN
25 * Capture and Playback sampling rates are independently
26 * controlled by two clock sources :
27 * CLK_5 := c_srate, and CLK_6 := p_srate
29 #define USB_OUT_IT_ID 1
31 #define IO_OUT_OT_ID 3
32 #define USB_IN_OT_ID 4
33 #define USB_OUT_CLK_ID 5
34 #define USB_IN_CLK_ID 6
36 #define CONTROL_ABSENT 0
37 #define CONTROL_RDONLY 1
38 #define CONTROL_RDWR 3
40 #define CLK_FREQ_CTRL 0
41 #define CLK_VLD_CTRL 2
51 struct g_audio g_audio;
52 u8 ac_intf, as_in_intf, as_out_intf;
53 u8 ac_alt, as_in_alt, as_out_alt; /* needed for get_alt() */
56 static inline struct f_uac2 *func_to_uac2(struct usb_function *f)
58 return container_of(f, struct f_uac2, g_audio.func);
62 struct f_uac2_opts *g_audio_to_uac2_opts(struct g_audio *agdev)
64 return container_of(agdev->func.fi, struct f_uac2_opts, func_inst);
67 /* --------- USB Function Interface ------------- */
84 static char clksrc_in[8];
85 static char clksrc_out[8];
87 static struct usb_string strings_fn[] = {
88 [STR_ASSOC].s = "Source/Sink",
89 [STR_IF_CTRL].s = "Topology Control",
90 [STR_CLKSRC_IN].s = clksrc_in,
91 [STR_CLKSRC_OUT].s = clksrc_out,
92 [STR_USB_IT].s = "USBH Out",
93 [STR_IO_IT].s = "USBD Out",
94 [STR_USB_OT].s = "USBH In",
95 [STR_IO_OT].s = "USBD In",
96 [STR_AS_OUT_ALT0].s = "Playback Inactive",
97 [STR_AS_OUT_ALT1].s = "Playback Active",
98 [STR_AS_IN_ALT0].s = "Capture Inactive",
99 [STR_AS_IN_ALT1].s = "Capture Active",
103 static struct usb_gadget_strings str_fn = {
104 .language = 0x0409, /* en-us */
105 .strings = strings_fn,
108 static struct usb_gadget_strings *fn_strings[] = {
113 static struct usb_interface_assoc_descriptor iad_desc = {
114 .bLength = sizeof iad_desc,
115 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
117 .bFirstInterface = 0,
118 .bInterfaceCount = 3,
119 .bFunctionClass = USB_CLASS_AUDIO,
120 .bFunctionSubClass = UAC2_FUNCTION_SUBCLASS_UNDEFINED,
121 .bFunctionProtocol = UAC_VERSION_2,
124 /* Audio Control Interface */
125 static struct usb_interface_descriptor std_ac_if_desc = {
126 .bLength = sizeof std_ac_if_desc,
127 .bDescriptorType = USB_DT_INTERFACE,
129 .bAlternateSetting = 0,
131 .bInterfaceClass = USB_CLASS_AUDIO,
132 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
133 .bInterfaceProtocol = UAC_VERSION_2,
136 /* Clock source for IN traffic */
137 static struct uac_clock_source_descriptor in_clk_src_desc = {
138 .bLength = sizeof in_clk_src_desc,
139 .bDescriptorType = USB_DT_CS_INTERFACE,
141 .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
142 .bClockID = USB_IN_CLK_ID,
143 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
144 .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
148 /* Clock source for OUT traffic */
149 static struct uac_clock_source_descriptor out_clk_src_desc = {
150 .bLength = sizeof out_clk_src_desc,
151 .bDescriptorType = USB_DT_CS_INTERFACE,
153 .bDescriptorSubtype = UAC2_CLOCK_SOURCE,
154 .bClockID = USB_OUT_CLK_ID,
155 .bmAttributes = UAC_CLOCK_SOURCE_TYPE_INT_FIXED,
156 .bmControls = (CONTROL_RDONLY << CLK_FREQ_CTRL),
160 /* Input Terminal for USB_OUT */
161 static struct uac2_input_terminal_descriptor usb_out_it_desc = {
162 .bLength = sizeof usb_out_it_desc,
163 .bDescriptorType = USB_DT_CS_INTERFACE,
165 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
166 .bTerminalID = USB_OUT_IT_ID,
167 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
169 .bCSourceID = USB_OUT_CLK_ID,
171 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
174 /* Input Terminal for I/O-In */
175 static struct uac2_input_terminal_descriptor io_in_it_desc = {
176 .bLength = sizeof io_in_it_desc,
177 .bDescriptorType = USB_DT_CS_INTERFACE,
179 .bDescriptorSubtype = UAC_INPUT_TERMINAL,
180 .bTerminalID = IO_IN_IT_ID,
181 .wTerminalType = cpu_to_le16(UAC_INPUT_TERMINAL_UNDEFINED),
183 .bCSourceID = USB_IN_CLK_ID,
185 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
188 /* Ouput Terminal for USB_IN */
189 static struct uac2_output_terminal_descriptor usb_in_ot_desc = {
190 .bLength = sizeof usb_in_ot_desc,
191 .bDescriptorType = USB_DT_CS_INTERFACE,
193 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
194 .bTerminalID = USB_IN_OT_ID,
195 .wTerminalType = cpu_to_le16(UAC_TERMINAL_STREAMING),
197 .bSourceID = IO_IN_IT_ID,
198 .bCSourceID = USB_IN_CLK_ID,
199 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
202 /* Ouput Terminal for I/O-Out */
203 static struct uac2_output_terminal_descriptor io_out_ot_desc = {
204 .bLength = sizeof io_out_ot_desc,
205 .bDescriptorType = USB_DT_CS_INTERFACE,
207 .bDescriptorSubtype = UAC_OUTPUT_TERMINAL,
208 .bTerminalID = IO_OUT_OT_ID,
209 .wTerminalType = cpu_to_le16(UAC_OUTPUT_TERMINAL_UNDEFINED),
211 .bSourceID = USB_OUT_IT_ID,
212 .bCSourceID = USB_OUT_CLK_ID,
213 .bmControls = cpu_to_le16(CONTROL_RDWR << COPY_CTRL),
216 static struct uac2_ac_header_descriptor ac_hdr_desc = {
217 .bLength = sizeof ac_hdr_desc,
218 .bDescriptorType = USB_DT_CS_INTERFACE,
220 .bDescriptorSubtype = UAC_MS_HEADER,
221 .bcdADC = cpu_to_le16(0x200),
222 .bCategory = UAC2_FUNCTION_IO_BOX,
223 .wTotalLength = cpu_to_le16(sizeof in_clk_src_desc
224 + sizeof out_clk_src_desc + sizeof usb_out_it_desc
225 + sizeof io_in_it_desc + sizeof usb_in_ot_desc
226 + sizeof io_out_ot_desc),
230 /* Audio Streaming OUT Interface - Alt0 */
231 static struct usb_interface_descriptor std_as_out_if0_desc = {
232 .bLength = sizeof std_as_out_if0_desc,
233 .bDescriptorType = USB_DT_INTERFACE,
235 .bAlternateSetting = 0,
237 .bInterfaceClass = USB_CLASS_AUDIO,
238 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
239 .bInterfaceProtocol = UAC_VERSION_2,
242 /* Audio Streaming OUT Interface - Alt1 */
243 static struct usb_interface_descriptor std_as_out_if1_desc = {
244 .bLength = sizeof std_as_out_if1_desc,
245 .bDescriptorType = USB_DT_INTERFACE,
247 .bAlternateSetting = 1,
249 .bInterfaceClass = USB_CLASS_AUDIO,
250 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
251 .bInterfaceProtocol = UAC_VERSION_2,
254 /* Audio Stream OUT Intface Desc */
255 static struct uac2_as_header_descriptor as_out_hdr_desc = {
256 .bLength = sizeof as_out_hdr_desc,
257 .bDescriptorType = USB_DT_CS_INTERFACE,
259 .bDescriptorSubtype = UAC_AS_GENERAL,
260 .bTerminalLink = USB_OUT_IT_ID,
262 .bFormatType = UAC_FORMAT_TYPE_I,
263 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
267 /* Audio USB_OUT Format */
268 static struct uac2_format_type_i_descriptor as_out_fmt1_desc = {
269 .bLength = sizeof as_out_fmt1_desc,
270 .bDescriptorType = USB_DT_CS_INTERFACE,
271 .bDescriptorSubtype = UAC_FORMAT_TYPE,
272 .bFormatType = UAC_FORMAT_TYPE_I,
275 /* STD AS ISO OUT Endpoint */
276 static struct usb_endpoint_descriptor fs_epout_desc = {
277 .bLength = USB_DT_ENDPOINT_SIZE,
278 .bDescriptorType = USB_DT_ENDPOINT,
280 .bEndpointAddress = USB_DIR_OUT,
281 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
282 /* .wMaxPacketSize = DYNAMIC */
286 static struct usb_endpoint_descriptor hs_epout_desc = {
287 .bLength = USB_DT_ENDPOINT_SIZE,
288 .bDescriptorType = USB_DT_ENDPOINT,
290 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
291 /* .wMaxPacketSize = DYNAMIC */
295 /* CS AS ISO OUT Endpoint */
296 static struct uac2_iso_endpoint_descriptor as_iso_out_desc = {
297 .bLength = sizeof as_iso_out_desc,
298 .bDescriptorType = USB_DT_CS_ENDPOINT,
300 .bDescriptorSubtype = UAC_EP_GENERAL,
303 .bLockDelayUnits = 0,
307 /* Audio Streaming IN Interface - Alt0 */
308 static struct usb_interface_descriptor std_as_in_if0_desc = {
309 .bLength = sizeof std_as_in_if0_desc,
310 .bDescriptorType = USB_DT_INTERFACE,
312 .bAlternateSetting = 0,
314 .bInterfaceClass = USB_CLASS_AUDIO,
315 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
316 .bInterfaceProtocol = UAC_VERSION_2,
319 /* Audio Streaming IN Interface - Alt1 */
320 static struct usb_interface_descriptor std_as_in_if1_desc = {
321 .bLength = sizeof std_as_in_if1_desc,
322 .bDescriptorType = USB_DT_INTERFACE,
324 .bAlternateSetting = 1,
326 .bInterfaceClass = USB_CLASS_AUDIO,
327 .bInterfaceSubClass = USB_SUBCLASS_AUDIOSTREAMING,
328 .bInterfaceProtocol = UAC_VERSION_2,
331 /* Audio Stream IN Intface Desc */
332 static struct uac2_as_header_descriptor as_in_hdr_desc = {
333 .bLength = sizeof as_in_hdr_desc,
334 .bDescriptorType = USB_DT_CS_INTERFACE,
336 .bDescriptorSubtype = UAC_AS_GENERAL,
337 .bTerminalLink = USB_IN_OT_ID,
339 .bFormatType = UAC_FORMAT_TYPE_I,
340 .bmFormats = cpu_to_le32(UAC_FORMAT_TYPE_I_PCM),
344 /* Audio USB_IN Format */
345 static struct uac2_format_type_i_descriptor as_in_fmt1_desc = {
346 .bLength = sizeof as_in_fmt1_desc,
347 .bDescriptorType = USB_DT_CS_INTERFACE,
348 .bDescriptorSubtype = UAC_FORMAT_TYPE,
349 .bFormatType = UAC_FORMAT_TYPE_I,
352 /* STD AS ISO IN Endpoint */
353 static struct usb_endpoint_descriptor fs_epin_desc = {
354 .bLength = USB_DT_ENDPOINT_SIZE,
355 .bDescriptorType = USB_DT_ENDPOINT,
357 .bEndpointAddress = USB_DIR_IN,
358 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
359 /* .wMaxPacketSize = DYNAMIC */
363 static struct usb_endpoint_descriptor hs_epin_desc = {
364 .bLength = USB_DT_ENDPOINT_SIZE,
365 .bDescriptorType = USB_DT_ENDPOINT,
367 .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC,
368 /* .wMaxPacketSize = DYNAMIC */
372 /* CS AS ISO IN Endpoint */
373 static struct uac2_iso_endpoint_descriptor as_iso_in_desc = {
374 .bLength = sizeof as_iso_in_desc,
375 .bDescriptorType = USB_DT_CS_ENDPOINT,
377 .bDescriptorSubtype = UAC_EP_GENERAL,
380 .bLockDelayUnits = 0,
384 static struct usb_descriptor_header *fs_audio_desc[] = {
385 (struct usb_descriptor_header *)&iad_desc,
386 (struct usb_descriptor_header *)&std_ac_if_desc,
388 (struct usb_descriptor_header *)&ac_hdr_desc,
389 (struct usb_descriptor_header *)&in_clk_src_desc,
390 (struct usb_descriptor_header *)&out_clk_src_desc,
391 (struct usb_descriptor_header *)&usb_out_it_desc,
392 (struct usb_descriptor_header *)&io_in_it_desc,
393 (struct usb_descriptor_header *)&usb_in_ot_desc,
394 (struct usb_descriptor_header *)&io_out_ot_desc,
396 (struct usb_descriptor_header *)&std_as_out_if0_desc,
397 (struct usb_descriptor_header *)&std_as_out_if1_desc,
399 (struct usb_descriptor_header *)&as_out_hdr_desc,
400 (struct usb_descriptor_header *)&as_out_fmt1_desc,
401 (struct usb_descriptor_header *)&fs_epout_desc,
402 (struct usb_descriptor_header *)&as_iso_out_desc,
404 (struct usb_descriptor_header *)&std_as_in_if0_desc,
405 (struct usb_descriptor_header *)&std_as_in_if1_desc,
407 (struct usb_descriptor_header *)&as_in_hdr_desc,
408 (struct usb_descriptor_header *)&as_in_fmt1_desc,
409 (struct usb_descriptor_header *)&fs_epin_desc,
410 (struct usb_descriptor_header *)&as_iso_in_desc,
414 static struct usb_descriptor_header *hs_audio_desc[] = {
415 (struct usb_descriptor_header *)&iad_desc,
416 (struct usb_descriptor_header *)&std_ac_if_desc,
418 (struct usb_descriptor_header *)&ac_hdr_desc,
419 (struct usb_descriptor_header *)&in_clk_src_desc,
420 (struct usb_descriptor_header *)&out_clk_src_desc,
421 (struct usb_descriptor_header *)&usb_out_it_desc,
422 (struct usb_descriptor_header *)&io_in_it_desc,
423 (struct usb_descriptor_header *)&usb_in_ot_desc,
424 (struct usb_descriptor_header *)&io_out_ot_desc,
426 (struct usb_descriptor_header *)&std_as_out_if0_desc,
427 (struct usb_descriptor_header *)&std_as_out_if1_desc,
429 (struct usb_descriptor_header *)&as_out_hdr_desc,
430 (struct usb_descriptor_header *)&as_out_fmt1_desc,
431 (struct usb_descriptor_header *)&hs_epout_desc,
432 (struct usb_descriptor_header *)&as_iso_out_desc,
434 (struct usb_descriptor_header *)&std_as_in_if0_desc,
435 (struct usb_descriptor_header *)&std_as_in_if1_desc,
437 (struct usb_descriptor_header *)&as_in_hdr_desc,
438 (struct usb_descriptor_header *)&as_in_fmt1_desc,
439 (struct usb_descriptor_header *)&hs_epin_desc,
440 (struct usb_descriptor_header *)&as_iso_in_desc,
444 struct cntrl_cur_lay3 {
448 struct cntrl_range_lay3 {
449 __le16 wNumSubRanges;
455 static int set_ep_max_packet_size(const struct f_uac2_opts *uac2_opts,
456 struct usb_endpoint_descriptor *ep_desc,
457 enum usb_device_speed speed, bool is_playback)
459 int chmask, srate, ssize;
460 u16 max_size_bw, max_size_ep;
479 chmask = uac2_opts->p_chmask;
480 srate = uac2_opts->p_srate;
481 ssize = uac2_opts->p_ssize;
483 chmask = uac2_opts->c_chmask;
484 srate = uac2_opts->c_srate;
485 ssize = uac2_opts->c_ssize;
488 max_size_bw = num_channels(chmask) * ssize *
489 ((srate / (factor / (1 << (ep_desc->bInterval - 1)))) + 1);
490 ep_desc->wMaxPacketSize = cpu_to_le16(min_t(u16, max_size_bw,
497 afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
499 struct f_uac2 *uac2 = func_to_uac2(fn);
500 struct g_audio *agdev = func_to_g_audio(fn);
501 struct usb_composite_dev *cdev = cfg->cdev;
502 struct usb_gadget *gadget = cdev->gadget;
503 struct device *dev = &gadget->dev;
504 struct f_uac2_opts *uac2_opts;
505 struct usb_string *us;
508 uac2_opts = container_of(fn->fi, struct f_uac2_opts, func_inst);
510 us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn));
513 iad_desc.iFunction = us[STR_ASSOC].id;
514 std_ac_if_desc.iInterface = us[STR_IF_CTRL].id;
515 in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id;
516 out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id;
517 usb_out_it_desc.iTerminal = us[STR_USB_IT].id;
518 io_in_it_desc.iTerminal = us[STR_IO_IT].id;
519 usb_in_ot_desc.iTerminal = us[STR_USB_OT].id;
520 io_out_ot_desc.iTerminal = us[STR_IO_OT].id;
521 std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id;
522 std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id;
523 std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id;
524 std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id;
527 /* Initialize the configurable parameters */
528 usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
529 usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
530 io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
531 io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
532 as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
533 as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
534 as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
535 as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
536 as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize;
537 as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8;
538 as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize;
539 as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8;
541 snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", uac2_opts->p_srate);
542 snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", uac2_opts->c_srate);
544 ret = usb_interface_id(cfg, fn);
546 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
549 iad_desc.bFirstInterface = ret;
551 std_ac_if_desc.bInterfaceNumber = ret;
555 ret = usb_interface_id(cfg, fn);
557 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
560 std_as_out_if0_desc.bInterfaceNumber = ret;
561 std_as_out_if1_desc.bInterfaceNumber = ret;
562 uac2->as_out_intf = ret;
563 uac2->as_out_alt = 0;
565 ret = usb_interface_id(cfg, fn);
567 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
570 std_as_in_if0_desc.bInterfaceNumber = ret;
571 std_as_in_if1_desc.bInterfaceNumber = ret;
572 uac2->as_in_intf = ret;
575 /* Calculate wMaxPacketSize according to audio bandwidth */
576 ret = set_ep_max_packet_size(uac2_opts, &fs_epin_desc, USB_SPEED_FULL,
579 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
583 ret = set_ep_max_packet_size(uac2_opts, &fs_epout_desc, USB_SPEED_FULL,
586 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
590 ret = set_ep_max_packet_size(uac2_opts, &hs_epin_desc, USB_SPEED_HIGH,
593 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
597 ret = set_ep_max_packet_size(uac2_opts, &hs_epout_desc, USB_SPEED_HIGH,
600 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
604 agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
605 if (!agdev->out_ep) {
606 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
610 agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
612 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
616 agdev->in_ep_maxpsize = max_t(u16,
617 le16_to_cpu(fs_epin_desc.wMaxPacketSize),
618 le16_to_cpu(hs_epin_desc.wMaxPacketSize));
619 agdev->out_ep_maxpsize = max_t(u16,
620 le16_to_cpu(fs_epout_desc.wMaxPacketSize),
621 le16_to_cpu(hs_epout_desc.wMaxPacketSize));
623 hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
624 hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
626 ret = usb_assign_descriptors(fn, fs_audio_desc, hs_audio_desc, NULL,
631 agdev->gadget = gadget;
633 agdev->params.p_chmask = uac2_opts->p_chmask;
634 agdev->params.p_srate = uac2_opts->p_srate;
635 agdev->params.p_ssize = uac2_opts->p_ssize;
636 agdev->params.c_chmask = uac2_opts->c_chmask;
637 agdev->params.c_srate = uac2_opts->c_srate;
638 agdev->params.c_ssize = uac2_opts->c_ssize;
639 agdev->params.req_number = uac2_opts->req_number;
640 ret = g_audio_setup(agdev, "UAC2 PCM", "UAC2_Gadget");
646 usb_free_all_descriptors(fn);
647 agdev->gadget = NULL;
652 afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
654 struct usb_composite_dev *cdev = fn->config->cdev;
655 struct f_uac2 *uac2 = func_to_uac2(fn);
656 struct usb_gadget *gadget = cdev->gadget;
657 struct device *dev = &gadget->dev;
660 /* No i/f has more than 2 alt settings */
662 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
666 if (intf == uac2->ac_intf) {
667 /* Control I/f has only 1 AltSetting - 0 */
669 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
675 if (intf == uac2->as_out_intf) {
676 uac2->as_out_alt = alt;
679 ret = u_audio_start_capture(&uac2->g_audio);
681 u_audio_stop_capture(&uac2->g_audio);
682 } else if (intf == uac2->as_in_intf) {
683 uac2->as_in_alt = alt;
686 ret = u_audio_start_playback(&uac2->g_audio);
688 u_audio_stop_playback(&uac2->g_audio);
690 dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
698 afunc_get_alt(struct usb_function *fn, unsigned intf)
700 struct f_uac2 *uac2 = func_to_uac2(fn);
701 struct g_audio *agdev = func_to_g_audio(fn);
703 if (intf == uac2->ac_intf)
705 else if (intf == uac2->as_out_intf)
706 return uac2->as_out_alt;
707 else if (intf == uac2->as_in_intf)
708 return uac2->as_in_alt;
710 dev_err(&agdev->gadget->dev,
711 "%s:%d Invalid Interface %d!\n",
712 __func__, __LINE__, intf);
718 afunc_disable(struct usb_function *fn)
720 struct f_uac2 *uac2 = func_to_uac2(fn);
723 uac2->as_out_alt = 0;
724 u_audio_stop_capture(&uac2->g_audio);
725 u_audio_stop_playback(&uac2->g_audio);
729 in_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
731 struct usb_request *req = fn->config->cdev->req;
732 struct g_audio *agdev = func_to_g_audio(fn);
733 struct f_uac2_opts *opts;
734 u16 w_length = le16_to_cpu(cr->wLength);
735 u16 w_index = le16_to_cpu(cr->wIndex);
736 u16 w_value = le16_to_cpu(cr->wValue);
737 u8 entity_id = (w_index >> 8) & 0xff;
738 u8 control_selector = w_value >> 8;
739 int value = -EOPNOTSUPP;
740 int p_srate, c_srate;
742 opts = g_audio_to_uac2_opts(agdev);
743 p_srate = opts->p_srate;
744 c_srate = opts->c_srate;
746 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
747 struct cntrl_cur_lay3 c;
748 memset(&c, 0, sizeof(struct cntrl_cur_lay3));
750 if (entity_id == USB_IN_CLK_ID)
751 c.dCUR = cpu_to_le32(p_srate);
752 else if (entity_id == USB_OUT_CLK_ID)
753 c.dCUR = cpu_to_le32(c_srate);
755 value = min_t(unsigned, w_length, sizeof c);
756 memcpy(req->buf, &c, value);
757 } else if (control_selector == UAC2_CS_CONTROL_CLOCK_VALID) {
759 value = min_t(unsigned, w_length, 1);
761 dev_err(&agdev->gadget->dev,
762 "%s:%d control_selector=%d TODO!\n",
763 __func__, __LINE__, control_selector);
770 in_rq_range(struct usb_function *fn, const struct usb_ctrlrequest *cr)
772 struct usb_request *req = fn->config->cdev->req;
773 struct g_audio *agdev = func_to_g_audio(fn);
774 struct f_uac2_opts *opts;
775 u16 w_length = le16_to_cpu(cr->wLength);
776 u16 w_index = le16_to_cpu(cr->wIndex);
777 u16 w_value = le16_to_cpu(cr->wValue);
778 u8 entity_id = (w_index >> 8) & 0xff;
779 u8 control_selector = w_value >> 8;
780 struct cntrl_range_lay3 r;
781 int value = -EOPNOTSUPP;
782 int p_srate, c_srate;
784 opts = g_audio_to_uac2_opts(agdev);
785 p_srate = opts->p_srate;
786 c_srate = opts->c_srate;
788 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
789 if (entity_id == USB_IN_CLK_ID)
790 r.dMIN = cpu_to_le32(p_srate);
791 else if (entity_id == USB_OUT_CLK_ID)
792 r.dMIN = cpu_to_le32(c_srate);
798 r.wNumSubRanges = cpu_to_le16(1);
800 value = min_t(unsigned, w_length, sizeof r);
801 memcpy(req->buf, &r, value);
803 dev_err(&agdev->gadget->dev,
804 "%s:%d control_selector=%d TODO!\n",
805 __func__, __LINE__, control_selector);
812 ac_rq_in(struct usb_function *fn, const struct usb_ctrlrequest *cr)
814 if (cr->bRequest == UAC2_CS_CUR)
815 return in_rq_cur(fn, cr);
816 else if (cr->bRequest == UAC2_CS_RANGE)
817 return in_rq_range(fn, cr);
823 out_rq_cur(struct usb_function *fn, const struct usb_ctrlrequest *cr)
825 u16 w_length = le16_to_cpu(cr->wLength);
826 u16 w_value = le16_to_cpu(cr->wValue);
827 u8 control_selector = w_value >> 8;
829 if (control_selector == UAC2_CS_CONTROL_SAM_FREQ)
836 setup_rq_inf(struct usb_function *fn, const struct usb_ctrlrequest *cr)
838 struct f_uac2 *uac2 = func_to_uac2(fn);
839 struct g_audio *agdev = func_to_g_audio(fn);
840 u16 w_index = le16_to_cpu(cr->wIndex);
841 u8 intf = w_index & 0xff;
843 if (intf != uac2->ac_intf) {
844 dev_err(&agdev->gadget->dev,
845 "%s:%d Error!\n", __func__, __LINE__);
849 if (cr->bRequestType & USB_DIR_IN)
850 return ac_rq_in(fn, cr);
851 else if (cr->bRequest == UAC2_CS_CUR)
852 return out_rq_cur(fn, cr);
858 afunc_setup(struct usb_function *fn, const struct usb_ctrlrequest *cr)
860 struct usb_composite_dev *cdev = fn->config->cdev;
861 struct g_audio *agdev = func_to_g_audio(fn);
862 struct usb_request *req = cdev->req;
863 u16 w_length = le16_to_cpu(cr->wLength);
864 int value = -EOPNOTSUPP;
866 /* Only Class specific requests are supposed to reach here */
867 if ((cr->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS)
870 if ((cr->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE)
871 value = setup_rq_inf(fn, cr);
873 dev_err(&agdev->gadget->dev, "%s:%d Error!\n",
878 req->zero = value < w_length;
879 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
881 dev_err(&agdev->gadget->dev,
882 "%s:%d Error!\n", __func__, __LINE__);
890 static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item)
892 return container_of(to_config_group(item), struct f_uac2_opts,
896 static void f_uac2_attr_release(struct config_item *item)
898 struct f_uac2_opts *opts = to_f_uac2_opts(item);
900 usb_put_function_instance(&opts->func_inst);
903 static struct configfs_item_operations f_uac2_item_ops = {
904 .release = f_uac2_attr_release,
907 #define UAC2_ATTRIBUTE(name) \
908 static ssize_t f_uac2_opts_##name##_show(struct config_item *item, \
911 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
914 mutex_lock(&opts->lock); \
915 result = sprintf(page, "%u\n", opts->name); \
916 mutex_unlock(&opts->lock); \
921 static ssize_t f_uac2_opts_##name##_store(struct config_item *item, \
922 const char *page, size_t len) \
924 struct f_uac2_opts *opts = to_f_uac2_opts(item); \
928 mutex_lock(&opts->lock); \
929 if (opts->refcnt) { \
934 ret = kstrtou32(page, 0, &num); \
942 mutex_unlock(&opts->lock); \
946 CONFIGFS_ATTR(f_uac2_opts_, name)
948 UAC2_ATTRIBUTE(p_chmask);
949 UAC2_ATTRIBUTE(p_srate);
950 UAC2_ATTRIBUTE(p_ssize);
951 UAC2_ATTRIBUTE(c_chmask);
952 UAC2_ATTRIBUTE(c_srate);
953 UAC2_ATTRIBUTE(c_ssize);
954 UAC2_ATTRIBUTE(req_number);
956 static struct configfs_attribute *f_uac2_attrs[] = {
957 &f_uac2_opts_attr_p_chmask,
958 &f_uac2_opts_attr_p_srate,
959 &f_uac2_opts_attr_p_ssize,
960 &f_uac2_opts_attr_c_chmask,
961 &f_uac2_opts_attr_c_srate,
962 &f_uac2_opts_attr_c_ssize,
963 &f_uac2_opts_attr_req_number,
967 static struct config_item_type f_uac2_func_type = {
968 .ct_item_ops = &f_uac2_item_ops,
969 .ct_attrs = f_uac2_attrs,
970 .ct_owner = THIS_MODULE,
973 static void afunc_free_inst(struct usb_function_instance *f)
975 struct f_uac2_opts *opts;
977 opts = container_of(f, struct f_uac2_opts, func_inst);
981 static struct usb_function_instance *afunc_alloc_inst(void)
983 struct f_uac2_opts *opts;
985 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
987 return ERR_PTR(-ENOMEM);
989 mutex_init(&opts->lock);
990 opts->func_inst.free_func_inst = afunc_free_inst;
992 config_group_init_type_name(&opts->func_inst.group, "",
995 opts->p_chmask = UAC2_DEF_PCHMASK;
996 opts->p_srate = UAC2_DEF_PSRATE;
997 opts->p_ssize = UAC2_DEF_PSSIZE;
998 opts->c_chmask = UAC2_DEF_CCHMASK;
999 opts->c_srate = UAC2_DEF_CSRATE;
1000 opts->c_ssize = UAC2_DEF_CSSIZE;
1001 opts->req_number = UAC2_DEF_REQ_NUM;
1002 return &opts->func_inst;
1005 static void afunc_free(struct usb_function *f)
1007 struct g_audio *agdev;
1008 struct f_uac2_opts *opts;
1010 agdev = func_to_g_audio(f);
1011 opts = container_of(f->fi, struct f_uac2_opts, func_inst);
1013 mutex_lock(&opts->lock);
1015 mutex_unlock(&opts->lock);
1018 static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
1020 struct g_audio *agdev = func_to_g_audio(f);
1022 g_audio_cleanup(agdev);
1023 usb_free_all_descriptors(f);
1025 agdev->gadget = NULL;
1028 static struct usb_function *afunc_alloc(struct usb_function_instance *fi)
1030 struct f_uac2 *uac2;
1031 struct f_uac2_opts *opts;
1033 uac2 = kzalloc(sizeof(*uac2), GFP_KERNEL);
1035 return ERR_PTR(-ENOMEM);
1037 opts = container_of(fi, struct f_uac2_opts, func_inst);
1038 mutex_lock(&opts->lock);
1040 mutex_unlock(&opts->lock);
1042 uac2->g_audio.func.name = "uac2_func";
1043 uac2->g_audio.func.bind = afunc_bind;
1044 uac2->g_audio.func.unbind = afunc_unbind;
1045 uac2->g_audio.func.set_alt = afunc_set_alt;
1046 uac2->g_audio.func.get_alt = afunc_get_alt;
1047 uac2->g_audio.func.disable = afunc_disable;
1048 uac2->g_audio.func.setup = afunc_setup;
1049 uac2->g_audio.func.free_func = afunc_free;
1051 return &uac2->g_audio.func;
1054 DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc);
1055 MODULE_LICENSE("GPL");
1056 MODULE_AUTHOR("Yadwinder Singh");
1057 MODULE_AUTHOR("Jaswinder Singh");