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>
27 struct g_audio g_audio
;
28 u8 ac_intf
, as_in_intf
, as_out_intf
;
29 u8 ac_alt
, as_in_alt
, as_out_alt
; /* needed for get_alt() */
32 static inline struct f_uac1
*func_to_uac1(struct usb_function
*f
)
34 return container_of(f
, struct f_uac1
, g_audio
.func
);
38 * DESCRIPTORS ... most are static, but strings and full
39 * configuration descriptors are built on demand.
43 * We have three interfaces - one AudioControl and two AudioStreaming
45 * The driver implements a simple UAC_1 topology.
46 * USB-OUT -> IT_1 -> OT_2 -> ALSA_Capture
47 * ALSA_Playback -> IT_3 -> OT_4 -> USB-IN
49 #define F_AUDIO_AC_INTERFACE 0
50 #define F_AUDIO_AS_OUT_INTERFACE 1
51 #define F_AUDIO_AS_IN_INTERFACE 2
52 /* Number of streaming interfaces */
53 #define F_AUDIO_NUM_INTERFACES 2
55 /* B.3.1 Standard AC Interface Descriptor */
56 static struct usb_interface_descriptor ac_interface_desc
= {
57 .bLength
= USB_DT_INTERFACE_SIZE
,
58 .bDescriptorType
= USB_DT_INTERFACE
,
60 .bInterfaceClass
= USB_CLASS_AUDIO
,
61 .bInterfaceSubClass
= USB_SUBCLASS_AUDIOCONTROL
,
65 * The number of AudioStreaming and MIDIStreaming interfaces
66 * in the Audio Interface Collection
68 DECLARE_UAC_AC_HEADER_DESCRIPTOR(2);
70 #define UAC_DT_AC_HEADER_LENGTH UAC_DT_AC_HEADER_SIZE(F_AUDIO_NUM_INTERFACES)
71 /* 2 input terminals and 2 output terminals */
72 #define UAC_DT_TOTAL_LENGTH (UAC_DT_AC_HEADER_LENGTH \
73 + 2*UAC_DT_INPUT_TERMINAL_SIZE + 2*UAC_DT_OUTPUT_TERMINAL_SIZE)
74 /* B.3.2 Class-Specific AC Interface Descriptor */
75 static struct uac1_ac_header_descriptor_2 ac_header_desc
= {
76 .bLength
= UAC_DT_AC_HEADER_LENGTH
,
77 .bDescriptorType
= USB_DT_CS_INTERFACE
,
78 .bDescriptorSubtype
= UAC_HEADER
,
79 .bcdADC
= cpu_to_le16(0x0100),
80 .wTotalLength
= cpu_to_le16(UAC_DT_TOTAL_LENGTH
),
81 .bInCollection
= F_AUDIO_NUM_INTERFACES
,
83 /* Interface number of the AudioStream interfaces */
89 #define USB_OUT_IT_ID 1
90 static struct uac_input_terminal_descriptor usb_out_it_desc
= {
91 .bLength
= UAC_DT_INPUT_TERMINAL_SIZE
,
92 .bDescriptorType
= USB_DT_CS_INTERFACE
,
93 .bDescriptorSubtype
= UAC_INPUT_TERMINAL
,
94 .bTerminalID
= USB_OUT_IT_ID
,
95 .wTerminalType
= cpu_to_le16(UAC_TERMINAL_STREAMING
),
97 .wChannelConfig
= cpu_to_le16(0x3),
100 #define IO_OUT_OT_ID 2
101 static struct uac1_output_terminal_descriptor io_out_ot_desc
= {
102 .bLength
= UAC_DT_OUTPUT_TERMINAL_SIZE
,
103 .bDescriptorType
= USB_DT_CS_INTERFACE
,
104 .bDescriptorSubtype
= UAC_OUTPUT_TERMINAL
,
105 .bTerminalID
= IO_OUT_OT_ID
,
106 .wTerminalType
= cpu_to_le16(UAC_OUTPUT_TERMINAL_SPEAKER
),
108 .bSourceID
= USB_OUT_IT_ID
,
111 #define IO_IN_IT_ID 3
112 static struct uac_input_terminal_descriptor io_in_it_desc
= {
113 .bLength
= UAC_DT_INPUT_TERMINAL_SIZE
,
114 .bDescriptorType
= USB_DT_CS_INTERFACE
,
115 .bDescriptorSubtype
= UAC_INPUT_TERMINAL
,
116 .bTerminalID
= IO_IN_IT_ID
,
117 .wTerminalType
= cpu_to_le16(UAC_INPUT_TERMINAL_MICROPHONE
),
119 .wChannelConfig
= cpu_to_le16(0x3),
122 #define USB_IN_OT_ID 4
123 static struct uac1_output_terminal_descriptor usb_in_ot_desc
= {
124 .bLength
= UAC_DT_OUTPUT_TERMINAL_SIZE
,
125 .bDescriptorType
= USB_DT_CS_INTERFACE
,
126 .bDescriptorSubtype
= UAC_OUTPUT_TERMINAL
,
127 .bTerminalID
= USB_IN_OT_ID
,
128 .wTerminalType
= cpu_to_le16(UAC_TERMINAL_STREAMING
),
130 .bSourceID
= IO_IN_IT_ID
,
133 /* B.4.1 Standard AS Interface Descriptor */
134 static struct usb_interface_descriptor as_out_interface_alt_0_desc
= {
135 .bLength
= USB_DT_INTERFACE_SIZE
,
136 .bDescriptorType
= USB_DT_INTERFACE
,
137 .bAlternateSetting
= 0,
139 .bInterfaceClass
= USB_CLASS_AUDIO
,
140 .bInterfaceSubClass
= USB_SUBCLASS_AUDIOSTREAMING
,
143 static struct usb_interface_descriptor as_out_interface_alt_1_desc
= {
144 .bLength
= USB_DT_INTERFACE_SIZE
,
145 .bDescriptorType
= USB_DT_INTERFACE
,
146 .bAlternateSetting
= 1,
148 .bInterfaceClass
= USB_CLASS_AUDIO
,
149 .bInterfaceSubClass
= USB_SUBCLASS_AUDIOSTREAMING
,
152 static struct usb_interface_descriptor as_in_interface_alt_0_desc
= {
153 .bLength
= USB_DT_INTERFACE_SIZE
,
154 .bDescriptorType
= USB_DT_INTERFACE
,
155 .bAlternateSetting
= 0,
157 .bInterfaceClass
= USB_CLASS_AUDIO
,
158 .bInterfaceSubClass
= USB_SUBCLASS_AUDIOSTREAMING
,
161 static struct usb_interface_descriptor as_in_interface_alt_1_desc
= {
162 .bLength
= USB_DT_INTERFACE_SIZE
,
163 .bDescriptorType
= USB_DT_INTERFACE
,
164 .bAlternateSetting
= 1,
166 .bInterfaceClass
= USB_CLASS_AUDIO
,
167 .bInterfaceSubClass
= USB_SUBCLASS_AUDIOSTREAMING
,
170 /* B.4.2 Class-Specific AS Interface Descriptor */
171 static struct uac1_as_header_descriptor as_out_header_desc
= {
172 .bLength
= UAC_DT_AS_HEADER_SIZE
,
173 .bDescriptorType
= USB_DT_CS_INTERFACE
,
174 .bDescriptorSubtype
= UAC_AS_GENERAL
,
175 .bTerminalLink
= USB_OUT_IT_ID
,
177 .wFormatTag
= cpu_to_le16(UAC_FORMAT_TYPE_I_PCM
),
180 static struct uac1_as_header_descriptor as_in_header_desc
= {
181 .bLength
= UAC_DT_AS_HEADER_SIZE
,
182 .bDescriptorType
= USB_DT_CS_INTERFACE
,
183 .bDescriptorSubtype
= UAC_AS_GENERAL
,
184 .bTerminalLink
= USB_IN_OT_ID
,
186 .wFormatTag
= cpu_to_le16(UAC_FORMAT_TYPE_I_PCM
),
189 DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(1);
191 static struct uac_format_type_i_discrete_descriptor_1 as_out_type_i_desc
= {
192 .bLength
= UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
193 .bDescriptorType
= USB_DT_CS_INTERFACE
,
194 .bDescriptorSubtype
= UAC_FORMAT_TYPE
,
195 .bFormatType
= UAC_FORMAT_TYPE_I
,
197 .bBitResolution
= 16,
201 /* Standard ISO OUT Endpoint Descriptor */
202 static struct usb_endpoint_descriptor as_out_ep_desc
= {
203 .bLength
= USB_DT_ENDPOINT_AUDIO_SIZE
,
204 .bDescriptorType
= USB_DT_ENDPOINT
,
205 .bEndpointAddress
= USB_DIR_OUT
,
206 .bmAttributes
= USB_ENDPOINT_SYNC_ADAPTIVE
207 | USB_ENDPOINT_XFER_ISOC
,
208 .wMaxPacketSize
= cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE
),
212 /* Class-specific AS ISO OUT Endpoint Descriptor */
213 static struct uac_iso_endpoint_descriptor as_iso_out_desc
= {
214 .bLength
= UAC_ISO_ENDPOINT_DESC_SIZE
,
215 .bDescriptorType
= USB_DT_CS_ENDPOINT
,
216 .bDescriptorSubtype
= UAC_EP_GENERAL
,
218 .bLockDelayUnits
= 1,
219 .wLockDelay
= cpu_to_le16(1),
222 static struct uac_format_type_i_discrete_descriptor_1 as_in_type_i_desc
= {
223 .bLength
= UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
224 .bDescriptorType
= USB_DT_CS_INTERFACE
,
225 .bDescriptorSubtype
= UAC_FORMAT_TYPE
,
226 .bFormatType
= UAC_FORMAT_TYPE_I
,
228 .bBitResolution
= 16,
232 /* Standard ISO OUT Endpoint Descriptor */
233 static struct usb_endpoint_descriptor as_in_ep_desc
= {
234 .bLength
= USB_DT_ENDPOINT_AUDIO_SIZE
,
235 .bDescriptorType
= USB_DT_ENDPOINT
,
236 .bEndpointAddress
= USB_DIR_IN
,
237 .bmAttributes
= USB_ENDPOINT_SYNC_ASYNC
238 | USB_ENDPOINT_XFER_ISOC
,
239 .wMaxPacketSize
= cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE
),
243 /* Class-specific AS ISO OUT Endpoint Descriptor */
244 static struct uac_iso_endpoint_descriptor as_iso_in_desc
= {
245 .bLength
= UAC_ISO_ENDPOINT_DESC_SIZE
,
246 .bDescriptorType
= USB_DT_CS_ENDPOINT
,
247 .bDescriptorSubtype
= UAC_EP_GENERAL
,
249 .bLockDelayUnits
= 0,
253 static struct usb_descriptor_header
*f_audio_desc
[] = {
254 (struct usb_descriptor_header
*)&ac_interface_desc
,
255 (struct usb_descriptor_header
*)&ac_header_desc
,
257 (struct usb_descriptor_header
*)&usb_out_it_desc
,
258 (struct usb_descriptor_header
*)&io_out_ot_desc
,
259 (struct usb_descriptor_header
*)&io_in_it_desc
,
260 (struct usb_descriptor_header
*)&usb_in_ot_desc
,
262 (struct usb_descriptor_header
*)&as_out_interface_alt_0_desc
,
263 (struct usb_descriptor_header
*)&as_out_interface_alt_1_desc
,
264 (struct usb_descriptor_header
*)&as_out_header_desc
,
266 (struct usb_descriptor_header
*)&as_out_type_i_desc
,
268 (struct usb_descriptor_header
*)&as_out_ep_desc
,
269 (struct usb_descriptor_header
*)&as_iso_out_desc
,
271 (struct usb_descriptor_header
*)&as_in_interface_alt_0_desc
,
272 (struct usb_descriptor_header
*)&as_in_interface_alt_1_desc
,
273 (struct usb_descriptor_header
*)&as_in_header_desc
,
275 (struct usb_descriptor_header
*)&as_in_type_i_desc
,
277 (struct usb_descriptor_header
*)&as_in_ep_desc
,
278 (struct usb_descriptor_header
*)&as_iso_in_desc
,
285 STR_USB_OUT_IT_CH_NAMES
,
288 STR_IO_IN_IT_CH_NAMES
,
296 static struct usb_string strings_uac1
[] = {
297 [STR_AC_IF
].s
= "AC Interface",
298 [STR_USB_OUT_IT
].s
= "Playback Input terminal",
299 [STR_USB_OUT_IT_CH_NAMES
].s
= "Playback Channels",
300 [STR_IO_OUT_OT
].s
= "Playback Output terminal",
301 [STR_IO_IN_IT
].s
= "Capture Input terminal",
302 [STR_IO_IN_IT_CH_NAMES
].s
= "Capture Channels",
303 [STR_USB_IN_OT
].s
= "Capture Output terminal",
304 [STR_AS_OUT_IF_ALT0
].s
= "Playback Inactive",
305 [STR_AS_OUT_IF_ALT1
].s
= "Playback Active",
306 [STR_AS_IN_IF_ALT0
].s
= "Capture Inactive",
307 [STR_AS_IN_IF_ALT1
].s
= "Capture Active",
311 static struct usb_gadget_strings str_uac1
= {
312 .language
= 0x0409, /* en-us */
313 .strings
= strings_uac1
,
316 static struct usb_gadget_strings
*uac1_strings
[] = {
322 * This function is an ALSA sound card following USB Audio Class Spec 1.0.
325 static int audio_set_endpoint_req(struct usb_function
*f
,
326 const struct usb_ctrlrequest
*ctrl
)
328 struct usb_composite_dev
*cdev
= f
->config
->cdev
;
329 int value
= -EOPNOTSUPP
;
330 u16 ep
= le16_to_cpu(ctrl
->wIndex
);
331 u16 len
= le16_to_cpu(ctrl
->wLength
);
332 u16 w_value
= le16_to_cpu(ctrl
->wValue
);
334 DBG(cdev
, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
335 ctrl
->bRequest
, w_value
, len
, ep
);
337 switch (ctrl
->bRequest
) {
361 static int audio_get_endpoint_req(struct usb_function
*f
,
362 const struct usb_ctrlrequest
*ctrl
)
364 struct usb_composite_dev
*cdev
= f
->config
->cdev
;
365 int value
= -EOPNOTSUPP
;
366 u8 ep
= ((le16_to_cpu(ctrl
->wIndex
) >> 8) & 0xFF);
367 u16 len
= le16_to_cpu(ctrl
->wLength
);
368 u16 w_value
= le16_to_cpu(ctrl
->wValue
);
370 DBG(cdev
, "bRequest 0x%x, w_value 0x%04x, len %d, endpoint %d\n",
371 ctrl
->bRequest
, w_value
, len
, ep
);
373 switch (ctrl
->bRequest
) {
390 f_audio_setup(struct usb_function
*f
, const struct usb_ctrlrequest
*ctrl
)
392 struct usb_composite_dev
*cdev
= f
->config
->cdev
;
393 struct usb_request
*req
= cdev
->req
;
394 int value
= -EOPNOTSUPP
;
395 u16 w_index
= le16_to_cpu(ctrl
->wIndex
);
396 u16 w_value
= le16_to_cpu(ctrl
->wValue
);
397 u16 w_length
= le16_to_cpu(ctrl
->wLength
);
399 /* composite driver infrastructure handles everything; interface
400 * activation uses set_alt().
402 switch (ctrl
->bRequestType
) {
403 case USB_DIR_OUT
| USB_TYPE_CLASS
| USB_RECIP_ENDPOINT
:
404 value
= audio_set_endpoint_req(f
, ctrl
);
407 case USB_DIR_IN
| USB_TYPE_CLASS
| USB_RECIP_ENDPOINT
:
408 value
= audio_get_endpoint_req(f
, ctrl
);
412 ERROR(cdev
, "invalid control req%02x.%02x v%04x i%04x l%d\n",
413 ctrl
->bRequestType
, ctrl
->bRequest
,
414 w_value
, w_index
, w_length
);
417 /* respond with data transfer or status phase? */
419 DBG(cdev
, "audio req%02x.%02x v%04x i%04x l%d\n",
420 ctrl
->bRequestType
, ctrl
->bRequest
,
421 w_value
, w_index
, w_length
);
424 value
= usb_ep_queue(cdev
->gadget
->ep0
, req
, GFP_ATOMIC
);
426 ERROR(cdev
, "audio response on err %d\n", value
);
429 /* device either stalls (value < 0) or reports success */
433 static int f_audio_set_alt(struct usb_function
*f
, unsigned intf
, unsigned alt
)
435 struct usb_composite_dev
*cdev
= f
->config
->cdev
;
436 struct usb_gadget
*gadget
= cdev
->gadget
;
437 struct device
*dev
= &gadget
->dev
;
438 struct f_uac1
*uac1
= func_to_uac1(f
);
441 /* No i/f has more than 2 alt settings */
443 dev_err(dev
, "%s:%d Error!\n", __func__
, __LINE__
);
447 if (intf
== uac1
->ac_intf
) {
448 /* Control I/f has only 1 AltSetting - 0 */
450 dev_err(dev
, "%s:%d Error!\n", __func__
, __LINE__
);
456 if (intf
== uac1
->as_out_intf
) {
457 uac1
->as_out_alt
= alt
;
460 ret
= u_audio_start_capture(&uac1
->g_audio
);
462 u_audio_stop_capture(&uac1
->g_audio
);
463 } else if (intf
== uac1
->as_in_intf
) {
464 uac1
->as_in_alt
= alt
;
467 ret
= u_audio_start_playback(&uac1
->g_audio
);
469 u_audio_stop_playback(&uac1
->g_audio
);
471 dev_err(dev
, "%s:%d Error!\n", __func__
, __LINE__
);
478 static int f_audio_get_alt(struct usb_function
*f
, unsigned intf
)
480 struct usb_composite_dev
*cdev
= f
->config
->cdev
;
481 struct usb_gadget
*gadget
= cdev
->gadget
;
482 struct device
*dev
= &gadget
->dev
;
483 struct f_uac1
*uac1
= func_to_uac1(f
);
485 if (intf
== uac1
->ac_intf
)
487 else if (intf
== uac1
->as_out_intf
)
488 return uac1
->as_out_alt
;
489 else if (intf
== uac1
->as_in_intf
)
490 return uac1
->as_in_alt
;
492 dev_err(dev
, "%s:%d Invalid Interface %d!\n",
493 __func__
, __LINE__
, intf
);
499 static void f_audio_disable(struct usb_function
*f
)
501 struct f_uac1
*uac1
= func_to_uac1(f
);
503 uac1
->as_out_alt
= 0;
506 u_audio_stop_capture(&uac1
->g_audio
);
509 /*-------------------------------------------------------------------------*/
511 /* audio function driver setup/binding */
512 static int f_audio_bind(struct usb_configuration
*c
, struct usb_function
*f
)
514 struct usb_composite_dev
*cdev
= c
->cdev
;
515 struct usb_gadget
*gadget
= cdev
->gadget
;
516 struct f_uac1
*uac1
= func_to_uac1(f
);
517 struct g_audio
*audio
= func_to_g_audio(f
);
518 struct f_uac1_opts
*audio_opts
;
519 struct usb_ep
*ep
= NULL
;
520 struct usb_string
*us
;
525 audio_opts
= container_of(f
->fi
, struct f_uac1_opts
, func_inst
);
527 us
= usb_gstrings_attach(cdev
, uac1_strings
, ARRAY_SIZE(strings_uac1
));
530 ac_interface_desc
.iInterface
= us
[STR_AC_IF
].id
;
531 usb_out_it_desc
.iTerminal
= us
[STR_USB_OUT_IT
].id
;
532 usb_out_it_desc
.iChannelNames
= us
[STR_USB_OUT_IT_CH_NAMES
].id
;
533 io_out_ot_desc
.iTerminal
= us
[STR_IO_OUT_OT
].id
;
534 as_out_interface_alt_0_desc
.iInterface
= us
[STR_AS_OUT_IF_ALT0
].id
;
535 as_out_interface_alt_1_desc
.iInterface
= us
[STR_AS_OUT_IF_ALT1
].id
;
536 io_in_it_desc
.iTerminal
= us
[STR_IO_IN_IT
].id
;
537 io_in_it_desc
.iChannelNames
= us
[STR_IO_IN_IT_CH_NAMES
].id
;
538 usb_in_ot_desc
.iTerminal
= us
[STR_USB_IN_OT
].id
;
539 as_in_interface_alt_0_desc
.iInterface
= us
[STR_AS_IN_IF_ALT0
].id
;
540 as_in_interface_alt_1_desc
.iInterface
= us
[STR_AS_IN_IF_ALT1
].id
;
542 /* Set channel numbers */
543 usb_out_it_desc
.bNrChannels
= num_channels(audio_opts
->c_chmask
);
544 usb_out_it_desc
.wChannelConfig
= cpu_to_le16(audio_opts
->c_chmask
);
545 as_out_type_i_desc
.bNrChannels
= num_channels(audio_opts
->c_chmask
);
546 as_out_type_i_desc
.bSubframeSize
= audio_opts
->c_ssize
;
547 as_out_type_i_desc
.bBitResolution
= audio_opts
->c_ssize
* 8;
548 io_in_it_desc
.bNrChannels
= num_channels(audio_opts
->p_chmask
);
549 io_in_it_desc
.wChannelConfig
= cpu_to_le16(audio_opts
->p_chmask
);
550 as_in_type_i_desc
.bNrChannels
= num_channels(audio_opts
->p_chmask
);
551 as_in_type_i_desc
.bSubframeSize
= audio_opts
->p_ssize
;
552 as_in_type_i_desc
.bBitResolution
= audio_opts
->p_ssize
* 8;
554 /* Set sample rates */
555 rate
= audio_opts
->c_srate
;
556 sam_freq
= as_out_type_i_desc
.tSamFreq
[0];
557 memcpy(sam_freq
, &rate
, 3);
558 rate
= audio_opts
->p_srate
;
559 sam_freq
= as_in_type_i_desc
.tSamFreq
[0];
560 memcpy(sam_freq
, &rate
, 3);
562 /* allocate instance-specific interface IDs, and patch descriptors */
563 status
= usb_interface_id(c
, f
);
566 ac_interface_desc
.bInterfaceNumber
= status
;
567 uac1
->ac_intf
= status
;
570 status
= usb_interface_id(c
, f
);
573 as_out_interface_alt_0_desc
.bInterfaceNumber
= status
;
574 as_out_interface_alt_1_desc
.bInterfaceNumber
= status
;
575 uac1
->as_out_intf
= status
;
576 uac1
->as_out_alt
= 0;
578 status
= usb_interface_id(c
, f
);
581 as_in_interface_alt_0_desc
.bInterfaceNumber
= status
;
582 as_in_interface_alt_1_desc
.bInterfaceNumber
= status
;
583 uac1
->as_in_intf
= status
;
586 audio
->gadget
= gadget
;
590 /* allocate instance-specific endpoints */
591 ep
= usb_ep_autoconfig(cdev
->gadget
, &as_out_ep_desc
);
595 audio
->out_ep
->desc
= &as_out_ep_desc
;
597 ep
= usb_ep_autoconfig(cdev
->gadget
, &as_in_ep_desc
);
601 audio
->in_ep
->desc
= &as_in_ep_desc
;
603 /* copy descriptors, and track endpoint copies */
604 status
= usb_assign_descriptors(f
, f_audio_desc
, f_audio_desc
, NULL
,
609 audio
->out_ep_maxpsize
= le16_to_cpu(as_out_ep_desc
.wMaxPacketSize
);
610 audio
->in_ep_maxpsize
= le16_to_cpu(as_in_ep_desc
.wMaxPacketSize
);
611 audio
->params
.c_chmask
= audio_opts
->c_chmask
;
612 audio
->params
.c_srate
= audio_opts
->c_srate
;
613 audio
->params
.c_ssize
= audio_opts
->c_ssize
;
614 audio
->params
.p_chmask
= audio_opts
->p_chmask
;
615 audio
->params
.p_srate
= audio_opts
->p_srate
;
616 audio
->params
.p_ssize
= audio_opts
->p_ssize
;
617 audio
->params
.req_number
= audio_opts
->req_number
;
619 status
= g_audio_setup(audio
, "UAC1_PCM", "UAC1_Gadget");
621 goto err_card_register
;
626 usb_free_all_descriptors(f
);
631 /*-------------------------------------------------------------------------*/
633 static inline struct f_uac1_opts
*to_f_uac1_opts(struct config_item
*item
)
635 return container_of(to_config_group(item
), struct f_uac1_opts
,
639 static void f_uac1_attr_release(struct config_item
*item
)
641 struct f_uac1_opts
*opts
= to_f_uac1_opts(item
);
643 usb_put_function_instance(&opts
->func_inst
);
646 static struct configfs_item_operations f_uac1_item_ops
= {
647 .release
= f_uac1_attr_release
,
650 #define UAC1_ATTRIBUTE(name) \
651 static ssize_t f_uac1_opts_##name##_show( \
652 struct config_item *item, \
655 struct f_uac1_opts *opts = to_f_uac1_opts(item); \
658 mutex_lock(&opts->lock); \
659 result = sprintf(page, "%u\n", opts->name); \
660 mutex_unlock(&opts->lock); \
665 static ssize_t f_uac1_opts_##name##_store( \
666 struct config_item *item, \
667 const char *page, size_t len) \
669 struct f_uac1_opts *opts = to_f_uac1_opts(item); \
673 mutex_lock(&opts->lock); \
674 if (opts->refcnt) { \
679 ret = kstrtou32(page, 0, &num); \
687 mutex_unlock(&opts->lock); \
691 CONFIGFS_ATTR(f_uac1_opts_, name)
693 UAC1_ATTRIBUTE(c_chmask
);
694 UAC1_ATTRIBUTE(c_srate
);
695 UAC1_ATTRIBUTE(c_ssize
);
696 UAC1_ATTRIBUTE(p_chmask
);
697 UAC1_ATTRIBUTE(p_srate
);
698 UAC1_ATTRIBUTE(p_ssize
);
699 UAC1_ATTRIBUTE(req_number
);
701 static struct configfs_attribute
*f_uac1_attrs
[] = {
702 &f_uac1_opts_attr_c_chmask
,
703 &f_uac1_opts_attr_c_srate
,
704 &f_uac1_opts_attr_c_ssize
,
705 &f_uac1_opts_attr_p_chmask
,
706 &f_uac1_opts_attr_p_srate
,
707 &f_uac1_opts_attr_p_ssize
,
708 &f_uac1_opts_attr_req_number
,
712 static struct config_item_type f_uac1_func_type
= {
713 .ct_item_ops
= &f_uac1_item_ops
,
714 .ct_attrs
= f_uac1_attrs
,
715 .ct_owner
= THIS_MODULE
,
718 static void f_audio_free_inst(struct usb_function_instance
*f
)
720 struct f_uac1_opts
*opts
;
722 opts
= container_of(f
, struct f_uac1_opts
, func_inst
);
726 static struct usb_function_instance
*f_audio_alloc_inst(void)
728 struct f_uac1_opts
*opts
;
730 opts
= kzalloc(sizeof(*opts
), GFP_KERNEL
);
732 return ERR_PTR(-ENOMEM
);
734 mutex_init(&opts
->lock
);
735 opts
->func_inst
.free_func_inst
= f_audio_free_inst
;
737 config_group_init_type_name(&opts
->func_inst
.group
, "",
740 opts
->c_chmask
= UAC1_DEF_CCHMASK
;
741 opts
->c_srate
= UAC1_DEF_CSRATE
;
742 opts
->c_ssize
= UAC1_DEF_CSSIZE
;
743 opts
->p_chmask
= UAC1_DEF_PCHMASK
;
744 opts
->p_srate
= UAC1_DEF_PSRATE
;
745 opts
->p_ssize
= UAC1_DEF_PSSIZE
;
746 opts
->req_number
= UAC1_DEF_REQ_NUM
;
747 return &opts
->func_inst
;
750 static void f_audio_free(struct usb_function
*f
)
752 struct g_audio
*audio
;
753 struct f_uac1_opts
*opts
;
755 audio
= func_to_g_audio(f
);
756 opts
= container_of(f
->fi
, struct f_uac1_opts
, func_inst
);
758 mutex_lock(&opts
->lock
);
760 mutex_unlock(&opts
->lock
);
763 static void f_audio_unbind(struct usb_configuration
*c
, struct usb_function
*f
)
765 struct g_audio
*audio
= func_to_g_audio(f
);
767 g_audio_cleanup(audio
);
768 usb_free_all_descriptors(f
);
770 audio
->gadget
= NULL
;
773 static struct usb_function
*f_audio_alloc(struct usb_function_instance
*fi
)
776 struct f_uac1_opts
*opts
;
778 /* allocate and initialize one new instance */
779 uac1
= kzalloc(sizeof(*uac1
), GFP_KERNEL
);
781 return ERR_PTR(-ENOMEM
);
783 opts
= container_of(fi
, struct f_uac1_opts
, func_inst
);
784 mutex_lock(&opts
->lock
);
786 mutex_unlock(&opts
->lock
);
788 uac1
->g_audio
.func
.name
= "uac1_func";
789 uac1
->g_audio
.func
.bind
= f_audio_bind
;
790 uac1
->g_audio
.func
.unbind
= f_audio_unbind
;
791 uac1
->g_audio
.func
.set_alt
= f_audio_set_alt
;
792 uac1
->g_audio
.func
.get_alt
= f_audio_get_alt
;
793 uac1
->g_audio
.func
.setup
= f_audio_setup
;
794 uac1
->g_audio
.func
.disable
= f_audio_disable
;
795 uac1
->g_audio
.func
.free_func
= f_audio_free
;
797 return &uac1
->g_audio
.func
;
800 DECLARE_USB_FUNCTION_INIT(uac1
, f_audio_alloc_inst
, f_audio_alloc
);
801 MODULE_LICENSE("GPL");
802 MODULE_AUTHOR("Ruslan Bilovol");