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1/*
2 * Clock domain and sample rate management functions
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 */
19
20#include <linux/bitops.h>
21#include <linux/init.h>
22#include <linux/string.h>
23#include <linux/usb.h>
24#include <linux/usb/audio.h>
25#include <linux/usb/audio-v2.h>
26
27#include <sound/core.h>
28#include <sound/info.h>
29#include <sound/pcm.h>
30
31#include "usbaudio.h"
32#include "card.h"
33#include "helper.h"
34#include "clock.h"
35
36static struct uac_clock_source_descriptor *
37 snd_usb_find_clock_source(struct usb_host_interface *ctrl_iface,
38 int clock_id)
39{
40 struct uac_clock_source_descriptor *cs = NULL;
41
42 while ((cs = snd_usb_find_csint_desc(ctrl_iface->extra,
43 ctrl_iface->extralen,
44 cs, UAC2_CLOCK_SOURCE))) {
45 if (cs->bClockID == clock_id)
46 return cs;
47 }
48
49 return NULL;
50}
51
52static struct uac_clock_selector_descriptor *
53 snd_usb_find_clock_selector(struct usb_host_interface *ctrl_iface,
54 int clock_id)
55{
56 struct uac_clock_selector_descriptor *cs = NULL;
57
58 while ((cs = snd_usb_find_csint_desc(ctrl_iface->extra,
59 ctrl_iface->extralen,
60 cs, UAC2_CLOCK_SELECTOR))) {
61 if (cs->bClockID == clock_id)
62 return cs;
63 }
64
65 return NULL;
66}
67
68static struct uac_clock_multiplier_descriptor *
69 snd_usb_find_clock_multiplier(struct usb_host_interface *ctrl_iface,
70 int clock_id)
71{
72 struct uac_clock_multiplier_descriptor *cs = NULL;
73
74 while ((cs = snd_usb_find_csint_desc(ctrl_iface->extra,
75 ctrl_iface->extralen,
76 cs, UAC2_CLOCK_MULTIPLIER))) {
77 if (cs->bClockID == clock_id)
78 return cs;
79 }
80
81 return NULL;
82}
83
84static int uac_clock_selector_get_val(struct snd_usb_audio *chip, int selector_id)
85{
86 unsigned char buf;
87 int ret;
88
89 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0),
90 UAC2_CS_CUR,
91 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
92 UAC2_CX_CLOCK_SELECTOR << 8,
93 snd_usb_ctrl_intf(chip) | (selector_id << 8),
94 &buf, sizeof(buf), 1000);
95
96 if (ret < 0)
97 return ret;
98
99 return buf;
100}
101
102static bool uac_clock_source_is_valid(struct snd_usb_audio *chip, int source_id)
103{
104 int err;
105 unsigned char data;
106 struct usb_device *dev = chip->dev;
107 struct uac_clock_source_descriptor *cs_desc =
108 snd_usb_find_clock_source(chip->ctrl_intf, source_id);
109
110 if (!cs_desc)
111 return 0;
112
113 /* If a clock source can't tell us whether it's valid, we assume it is */
114 if (!uac2_control_is_readable(cs_desc->bmControls, UAC2_CS_CONTROL_CLOCK_VALID))
115 return 1;
116
117 err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
118 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
119 UAC2_CS_CONTROL_CLOCK_VALID << 8,
120 snd_usb_ctrl_intf(chip) | (source_id << 8),
121 &data, sizeof(data), 1000);
122
123 if (err < 0) {
124 snd_printk(KERN_WARNING "%s(): cannot get clock validity for id %d\n",
125 __func__, source_id);
126 return 0;
127 }
128
129 return !!data;
130}
131
132static int __uac_clock_find_source(struct snd_usb_audio *chip,
133 int entity_id, unsigned long *visited)
134{
135 struct uac_clock_source_descriptor *source;
136 struct uac_clock_selector_descriptor *selector;
137 struct uac_clock_multiplier_descriptor *multiplier;
138
139 entity_id &= 0xff;
140
141 if (test_and_set_bit(entity_id, visited)) {
142 snd_printk(KERN_WARNING
143 "%s(): recursive clock topology detected, id %d.\n",
144 __func__, entity_id);
145 return -EINVAL;
146 }
147
148 /* first, see if the ID we're looking for is a clock source already */
149 source = snd_usb_find_clock_source(chip->ctrl_intf, entity_id);
150 if (source)
151 return source->bClockID;
152
153 selector = snd_usb_find_clock_selector(chip->ctrl_intf, entity_id);
154 if (selector) {
155 int ret;
156
157 /* the entity ID we are looking for is a selector.
158 * find out what it currently selects */
159 ret = uac_clock_selector_get_val(chip, selector->bClockID);
160 if (ret < 0)
161 return ret;
162
163 /* Selector values are one-based */
164
165 if (ret > selector->bNrInPins || ret < 1) {
166 printk(KERN_ERR
167 "%s(): selector reported illegal value, id %d, ret %d\n",
168 __func__, selector->bClockID, ret);
169
170 return -EINVAL;
171 }
172
173 return __uac_clock_find_source(chip, selector->baCSourceID[ret-1],
174 visited);
175 }
176
177 /* FIXME: multipliers only act as pass-thru element for now */
178 multiplier = snd_usb_find_clock_multiplier(chip->ctrl_intf, entity_id);
179 if (multiplier)
180 return __uac_clock_find_source(chip, multiplier->bCSourceID,
181 visited);
182
183 return -EINVAL;
184}
185
186/*
187 * For all kinds of sample rate settings and other device queries,
188 * the clock source (end-leaf) must be used. However, clock selectors,
189 * clock multipliers and sample rate converters may be specified as
190 * clock source input to terminal. This functions walks the clock path
191 * to its end and tries to find the source.
192 *
193 * The 'visited' bitfield is used internally to detect recursive loops.
194 *
195 * Returns the clock source UnitID (>=0) on success, or an error.
196 */
197int snd_usb_clock_find_source(struct snd_usb_audio *chip, int entity_id)
198{
199 DECLARE_BITMAP(visited, 256);
200 memset(visited, 0, sizeof(visited));
201 return __uac_clock_find_source(chip, entity_id, visited);
202}
203
204static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
205 struct usb_host_interface *alts,
206 struct audioformat *fmt, int rate)
207{
208 struct usb_device *dev = chip->dev;
209 unsigned int ep;
210 unsigned char data[3];
211 int err, crate;
212
213 ep = get_endpoint(alts, 0)->bEndpointAddress;
214
215 /* if endpoint doesn't have sampling rate control, bail out */
216 if (!(fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE))
217 return 0;
218
219 data[0] = rate;
220 data[1] = rate >> 8;
221 data[2] = rate >> 16;
222 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
223 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
224 UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
225 data, sizeof(data), 1000)) < 0) {
226 snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d to ep %#x\n",
227 dev->devnum, iface, fmt->altsetting, rate, ep);
228 return err;
229 }
230
231 if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR,
232 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_IN,
233 UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
234 data, sizeof(data), 1000)) < 0) {
235 snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq at ep %#x\n",
236 dev->devnum, iface, fmt->altsetting, ep);
237 return 0; /* some devices don't support reading */
238 }
239
240 crate = data[0] | (data[1] << 8) | (data[2] << 16);
241 if (crate != rate) {
242 snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
243 // runtime->rate = crate;
244 }
245
246 return 0;
247}
248
249static int set_sample_rate_v2(struct snd_usb_audio *chip, int iface,
250 struct usb_host_interface *alts,
251 struct audioformat *fmt, int rate)
252{
253 struct usb_device *dev = chip->dev;
254 unsigned char data[4];
255 int err, crate;
256 int clock = snd_usb_clock_find_source(chip, fmt->clock);
257
258 if (clock < 0)
259 return clock;
260
261 if (!uac_clock_source_is_valid(chip, clock)) {
262 /* TODO: should we try to find valid clock setups by ourself? */
263 snd_printk(KERN_ERR "%d:%d:%d: clock source %d is not valid, cannot use\n",
264 dev->devnum, iface, fmt->altsetting, clock);
265 return -ENXIO;
266 }
267
268 data[0] = rate;
269 data[1] = rate >> 8;
270 data[2] = rate >> 16;
271 data[3] = rate >> 24;
272 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
273 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
274 UAC2_CS_CONTROL_SAM_FREQ << 8,
275 snd_usb_ctrl_intf(chip) | (clock << 8),
276 data, sizeof(data), 1000)) < 0) {
277 snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d (v2)\n",
278 dev->devnum, iface, fmt->altsetting, rate);
279 return err;
280 }
281
282 if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
283 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
284 UAC2_CS_CONTROL_SAM_FREQ << 8,
285 snd_usb_ctrl_intf(chip) | (clock << 8),
286 data, sizeof(data), 1000)) < 0) {
287 snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq (v2)\n",
288 dev->devnum, iface, fmt->altsetting);
289 return err;
290 }
291
292 crate = data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
293 if (crate != rate)
294 snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
295
296 return 0;
297}
298
299int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
300 struct usb_host_interface *alts,
301 struct audioformat *fmt, int rate)
302{
303 struct usb_interface_descriptor *altsd = get_iface_desc(alts);
304
305 switch (altsd->bInterfaceProtocol) {
306 case UAC_VERSION_1:
307 default:
308 return set_sample_rate_v1(chip, iface, alts, fmt, rate);
309
310 case UAC_VERSION_2:
311 return set_sample_rate_v2(chip, iface, alts, fmt, rate);
312 }
313}
314
1/*
2 * Clock domain and sample rate management functions
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 */
19
20#include <linux/bitops.h>
21#include <linux/init.h>
22#include <linux/string.h>
23#include <linux/usb.h>
24#include <linux/usb/audio.h>
25#include <linux/usb/audio-v2.h>
26#include <linux/usb/audio-v3.h>
27
28#include <sound/core.h>
29#include <sound/info.h>
30#include <sound/pcm.h>
31
32#include "usbaudio.h"
33#include "card.h"
34#include "helper.h"
35#include "clock.h"
36#include "quirks.h"
37
38static void *find_uac_clock_desc(struct usb_host_interface *iface, int id,
39 bool (*validator)(void *, int), u8 type)
40{
41 void *cs = NULL;
42
43 while ((cs = snd_usb_find_csint_desc(iface->extra, iface->extralen,
44 cs, type))) {
45 if (validator(cs, id))
46 return cs;
47 }
48
49 return NULL;
50}
51
52static bool validate_clock_source_v2(void *p, int id)
53{
54 struct uac_clock_source_descriptor *cs = p;
55 return cs->bLength == sizeof(*cs) && cs->bClockID == id;
56}
57
58static bool validate_clock_source_v3(void *p, int id)
59{
60 struct uac3_clock_source_descriptor *cs = p;
61 return cs->bLength == sizeof(*cs) && cs->bClockID == id;
62}
63
64static bool validate_clock_selector_v2(void *p, int id)
65{
66 struct uac_clock_selector_descriptor *cs = p;
67 return cs->bLength >= sizeof(*cs) && cs->bClockID == id &&
68 cs->bLength == 7 + cs->bNrInPins;
69}
70
71static bool validate_clock_selector_v3(void *p, int id)
72{
73 struct uac3_clock_selector_descriptor *cs = p;
74 return cs->bLength >= sizeof(*cs) && cs->bClockID == id &&
75 cs->bLength == 11 + cs->bNrInPins;
76}
77
78static bool validate_clock_multiplier_v2(void *p, int id)
79{
80 struct uac_clock_multiplier_descriptor *cs = p;
81 return cs->bLength == sizeof(*cs) && cs->bClockID == id;
82}
83
84static bool validate_clock_multiplier_v3(void *p, int id)
85{
86 struct uac3_clock_multiplier_descriptor *cs = p;
87 return cs->bLength == sizeof(*cs) && cs->bClockID == id;
88}
89
90#define DEFINE_FIND_HELPER(name, obj, validator, type) \
91static obj *name(struct usb_host_interface *iface, int id) \
92{ \
93 return find_uac_clock_desc(iface, id, validator, type); \
94}
95
96DEFINE_FIND_HELPER(snd_usb_find_clock_source,
97 struct uac_clock_source_descriptor,
98 validate_clock_source_v2, UAC2_CLOCK_SOURCE);
99DEFINE_FIND_HELPER(snd_usb_find_clock_source_v3,
100 struct uac3_clock_source_descriptor,
101 validate_clock_source_v3, UAC3_CLOCK_SOURCE);
102
103DEFINE_FIND_HELPER(snd_usb_find_clock_selector,
104 struct uac_clock_selector_descriptor,
105 validate_clock_selector_v2, UAC2_CLOCK_SELECTOR);
106DEFINE_FIND_HELPER(snd_usb_find_clock_selector_v3,
107 struct uac3_clock_selector_descriptor,
108 validate_clock_selector_v3, UAC3_CLOCK_SELECTOR);
109
110DEFINE_FIND_HELPER(snd_usb_find_clock_multiplier,
111 struct uac_clock_multiplier_descriptor,
112 validate_clock_multiplier_v2, UAC2_CLOCK_MULTIPLIER);
113DEFINE_FIND_HELPER(snd_usb_find_clock_multiplier_v3,
114 struct uac3_clock_multiplier_descriptor,
115 validate_clock_multiplier_v3, UAC3_CLOCK_MULTIPLIER);
116
117static int uac_clock_selector_get_val(struct snd_usb_audio *chip, int selector_id)
118{
119 unsigned char buf;
120 int ret;
121
122 ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0),
123 UAC2_CS_CUR,
124 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
125 UAC2_CX_CLOCK_SELECTOR << 8,
126 snd_usb_ctrl_intf(chip) | (selector_id << 8),
127 &buf, sizeof(buf));
128
129 if (ret < 0)
130 return ret;
131
132 return buf;
133}
134
135static int uac_clock_selector_set_val(struct snd_usb_audio *chip, int selector_id,
136 unsigned char pin)
137{
138 int ret;
139
140 ret = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0),
141 UAC2_CS_CUR,
142 USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
143 UAC2_CX_CLOCK_SELECTOR << 8,
144 snd_usb_ctrl_intf(chip) | (selector_id << 8),
145 &pin, sizeof(pin));
146 if (ret < 0)
147 return ret;
148
149 if (ret != sizeof(pin)) {
150 usb_audio_err(chip,
151 "setting selector (id %d) unexpected length %d\n",
152 selector_id, ret);
153 return -EINVAL;
154 }
155
156 ret = uac_clock_selector_get_val(chip, selector_id);
157 if (ret < 0)
158 return ret;
159
160 if (ret != pin) {
161 usb_audio_err(chip,
162 "setting selector (id %d) to %x failed (current: %d)\n",
163 selector_id, pin, ret);
164 return -EINVAL;
165 }
166
167 return ret;
168}
169
170static bool uac_clock_source_is_valid(struct snd_usb_audio *chip,
171 int protocol,
172 int source_id)
173{
174 int err;
175 unsigned char data;
176 struct usb_device *dev = chip->dev;
177 u32 bmControls;
178
179 if (protocol == UAC_VERSION_3) {
180 struct uac3_clock_source_descriptor *cs_desc =
181 snd_usb_find_clock_source_v3(chip->ctrl_intf, source_id);
182
183 if (!cs_desc)
184 return 0;
185 bmControls = le32_to_cpu(cs_desc->bmControls);
186 } else { /* UAC_VERSION_1/2 */
187 struct uac_clock_source_descriptor *cs_desc =
188 snd_usb_find_clock_source(chip->ctrl_intf, source_id);
189
190 if (!cs_desc)
191 return 0;
192 bmControls = cs_desc->bmControls;
193 }
194
195 /* If a clock source can't tell us whether it's valid, we assume it is */
196 if (!uac_v2v3_control_is_readable(bmControls,
197 UAC2_CS_CONTROL_CLOCK_VALID))
198 return 1;
199
200 err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
201 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
202 UAC2_CS_CONTROL_CLOCK_VALID << 8,
203 snd_usb_ctrl_intf(chip) | (source_id << 8),
204 &data, sizeof(data));
205
206 if (err < 0) {
207 dev_warn(&dev->dev,
208 "%s(): cannot get clock validity for id %d\n",
209 __func__, source_id);
210 return 0;
211 }
212
213 return !!data;
214}
215
216static int __uac_clock_find_source(struct snd_usb_audio *chip, int entity_id,
217 unsigned long *visited, bool validate)
218{
219 struct uac_clock_source_descriptor *source;
220 struct uac_clock_selector_descriptor *selector;
221 struct uac_clock_multiplier_descriptor *multiplier;
222
223 entity_id &= 0xff;
224
225 if (test_and_set_bit(entity_id, visited)) {
226 usb_audio_warn(chip,
227 "%s(): recursive clock topology detected, id %d.\n",
228 __func__, entity_id);
229 return -EINVAL;
230 }
231
232 /* first, see if the ID we're looking for is a clock source already */
233 source = snd_usb_find_clock_source(chip->ctrl_intf, entity_id);
234 if (source) {
235 entity_id = source->bClockID;
236 if (validate && !uac_clock_source_is_valid(chip, UAC_VERSION_2,
237 entity_id)) {
238 usb_audio_err(chip,
239 "clock source %d is not valid, cannot use\n",
240 entity_id);
241 return -ENXIO;
242 }
243 return entity_id;
244 }
245
246 selector = snd_usb_find_clock_selector(chip->ctrl_intf, entity_id);
247 if (selector) {
248 int ret, i, cur;
249
250 /* the entity ID we are looking for is a selector.
251 * find out what it currently selects */
252 ret = uac_clock_selector_get_val(chip, selector->bClockID);
253 if (ret < 0)
254 return ret;
255
256 /* Selector values are one-based */
257
258 if (ret > selector->bNrInPins || ret < 1) {
259 usb_audio_err(chip,
260 "%s(): selector reported illegal value, id %d, ret %d\n",
261 __func__, selector->bClockID, ret);
262
263 return -EINVAL;
264 }
265
266 cur = ret;
267 ret = __uac_clock_find_source(chip, selector->baCSourceID[ret - 1],
268 visited, validate);
269 if (!validate || ret > 0 || !chip->autoclock)
270 return ret;
271
272 /* The current clock source is invalid, try others. */
273 for (i = 1; i <= selector->bNrInPins; i++) {
274 int err;
275
276 if (i == cur)
277 continue;
278
279 ret = __uac_clock_find_source(chip, selector->baCSourceID[i - 1],
280 visited, true);
281 if (ret < 0)
282 continue;
283
284 err = uac_clock_selector_set_val(chip, entity_id, i);
285 if (err < 0)
286 continue;
287
288 usb_audio_info(chip,
289 "found and selected valid clock source %d\n",
290 ret);
291 return ret;
292 }
293
294 return -ENXIO;
295 }
296
297 /* FIXME: multipliers only act as pass-thru element for now */
298 multiplier = snd_usb_find_clock_multiplier(chip->ctrl_intf, entity_id);
299 if (multiplier)
300 return __uac_clock_find_source(chip, multiplier->bCSourceID,
301 visited, validate);
302
303 return -EINVAL;
304}
305
306static int __uac3_clock_find_source(struct snd_usb_audio *chip, int entity_id,
307 unsigned long *visited, bool validate)
308{
309 struct uac3_clock_source_descriptor *source;
310 struct uac3_clock_selector_descriptor *selector;
311 struct uac3_clock_multiplier_descriptor *multiplier;
312
313 entity_id &= 0xff;
314
315 if (test_and_set_bit(entity_id, visited)) {
316 usb_audio_warn(chip,
317 "%s(): recursive clock topology detected, id %d.\n",
318 __func__, entity_id);
319 return -EINVAL;
320 }
321
322 /* first, see if the ID we're looking for is a clock source already */
323 source = snd_usb_find_clock_source_v3(chip->ctrl_intf, entity_id);
324 if (source) {
325 entity_id = source->bClockID;
326 if (validate && !uac_clock_source_is_valid(chip, UAC_VERSION_3,
327 entity_id)) {
328 usb_audio_err(chip,
329 "clock source %d is not valid, cannot use\n",
330 entity_id);
331 return -ENXIO;
332 }
333 return entity_id;
334 }
335
336 selector = snd_usb_find_clock_selector_v3(chip->ctrl_intf, entity_id);
337 if (selector) {
338 int ret, i, cur;
339
340 /* the entity ID we are looking for is a selector.
341 * find out what it currently selects */
342 ret = uac_clock_selector_get_val(chip, selector->bClockID);
343 if (ret < 0)
344 return ret;
345
346 /* Selector values are one-based */
347
348 if (ret > selector->bNrInPins || ret < 1) {
349 usb_audio_err(chip,
350 "%s(): selector reported illegal value, id %d, ret %d\n",
351 __func__, selector->bClockID, ret);
352
353 return -EINVAL;
354 }
355
356 cur = ret;
357 ret = __uac3_clock_find_source(chip, selector->baCSourceID[ret - 1],
358 visited, validate);
359 if (!validate || ret > 0 || !chip->autoclock)
360 return ret;
361
362 /* The current clock source is invalid, try others. */
363 for (i = 1; i <= selector->bNrInPins; i++) {
364 int err;
365
366 if (i == cur)
367 continue;
368
369 ret = __uac3_clock_find_source(chip, selector->baCSourceID[i - 1],
370 visited, true);
371 if (ret < 0)
372 continue;
373
374 err = uac_clock_selector_set_val(chip, entity_id, i);
375 if (err < 0)
376 continue;
377
378 usb_audio_info(chip,
379 "found and selected valid clock source %d\n",
380 ret);
381 return ret;
382 }
383
384 return -ENXIO;
385 }
386
387 /* FIXME: multipliers only act as pass-thru element for now */
388 multiplier = snd_usb_find_clock_multiplier_v3(chip->ctrl_intf,
389 entity_id);
390 if (multiplier)
391 return __uac3_clock_find_source(chip, multiplier->bCSourceID,
392 visited, validate);
393
394 return -EINVAL;
395}
396
397/*
398 * For all kinds of sample rate settings and other device queries,
399 * the clock source (end-leaf) must be used. However, clock selectors,
400 * clock multipliers and sample rate converters may be specified as
401 * clock source input to terminal. This functions walks the clock path
402 * to its end and tries to find the source.
403 *
404 * The 'visited' bitfield is used internally to detect recursive loops.
405 *
406 * Returns the clock source UnitID (>=0) on success, or an error.
407 */
408int snd_usb_clock_find_source(struct snd_usb_audio *chip, int protocol,
409 int entity_id, bool validate)
410{
411 DECLARE_BITMAP(visited, 256);
412 memset(visited, 0, sizeof(visited));
413
414 switch (protocol) {
415 case UAC_VERSION_2:
416 return __uac_clock_find_source(chip, entity_id, visited,
417 validate);
418 case UAC_VERSION_3:
419 return __uac3_clock_find_source(chip, entity_id, visited,
420 validate);
421 default:
422 return -EINVAL;
423 }
424}
425
426static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
427 struct usb_host_interface *alts,
428 struct audioformat *fmt, int rate)
429{
430 struct usb_device *dev = chip->dev;
431 unsigned int ep;
432 unsigned char data[3];
433 int err, crate;
434
435 if (get_iface_desc(alts)->bNumEndpoints < 1)
436 return -EINVAL;
437 ep = get_endpoint(alts, 0)->bEndpointAddress;
438
439 /* if endpoint doesn't have sampling rate control, bail out */
440 if (!(fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE))
441 return 0;
442
443 data[0] = rate;
444 data[1] = rate >> 8;
445 data[2] = rate >> 16;
446 if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
447 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
448 UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
449 data, sizeof(data))) < 0) {
450 dev_err(&dev->dev, "%d:%d: cannot set freq %d to ep %#x\n",
451 iface, fmt->altsetting, rate, ep);
452 return err;
453 }
454
455 /* Don't check the sample rate for devices which we know don't
456 * support reading */
457 if (snd_usb_get_sample_rate_quirk(chip))
458 return 0;
459 /* the firmware is likely buggy, don't repeat to fail too many times */
460 if (chip->sample_rate_read_error > 2)
461 return 0;
462
463 if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR,
464 USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_IN,
465 UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
466 data, sizeof(data))) < 0) {
467 dev_err(&dev->dev, "%d:%d: cannot get freq at ep %#x\n",
468 iface, fmt->altsetting, ep);
469 chip->sample_rate_read_error++;
470 return 0; /* some devices don't support reading */
471 }
472
473 crate = data[0] | (data[1] << 8) | (data[2] << 16);
474 if (crate != rate) {
475 dev_warn(&dev->dev, "current rate %d is different from the runtime rate %d\n", crate, rate);
476 // runtime->rate = crate;
477 }
478
479 return 0;
480}
481
482static int get_sample_rate_v2v3(struct snd_usb_audio *chip, int iface,
483 int altsetting, int clock)
484{
485 struct usb_device *dev = chip->dev;
486 __le32 data;
487 int err;
488
489 err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
490 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
491 UAC2_CS_CONTROL_SAM_FREQ << 8,
492 snd_usb_ctrl_intf(chip) | (clock << 8),
493 &data, sizeof(data));
494 if (err < 0) {
495 dev_warn(&dev->dev, "%d:%d: cannot get freq (v2/v3): err %d\n",
496 iface, altsetting, err);
497 return 0;
498 }
499
500 return le32_to_cpu(data);
501}
502
503static int set_sample_rate_v2v3(struct snd_usb_audio *chip, int iface,
504 struct usb_host_interface *alts,
505 struct audioformat *fmt, int rate)
506{
507 struct usb_device *dev = chip->dev;
508 __le32 data;
509 int err, cur_rate, prev_rate;
510 int clock;
511 bool writeable;
512 u32 bmControls;
513
514 clock = snd_usb_clock_find_source(chip, fmt->protocol,
515 fmt->clock, true);
516 if (clock < 0)
517 return clock;
518
519 prev_rate = get_sample_rate_v2v3(chip, iface, fmt->altsetting, clock);
520 if (prev_rate == rate)
521 return 0;
522
523 if (fmt->protocol == UAC_VERSION_3) {
524 struct uac3_clock_source_descriptor *cs_desc;
525
526 cs_desc = snd_usb_find_clock_source_v3(chip->ctrl_intf, clock);
527 bmControls = le32_to_cpu(cs_desc->bmControls);
528 } else {
529 struct uac_clock_source_descriptor *cs_desc;
530
531 cs_desc = snd_usb_find_clock_source(chip->ctrl_intf, clock);
532 bmControls = cs_desc->bmControls;
533 }
534
535 writeable = uac_v2v3_control_is_writeable(bmControls,
536 UAC2_CS_CONTROL_SAM_FREQ);
537 if (writeable) {
538 data = cpu_to_le32(rate);
539 err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
540 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
541 UAC2_CS_CONTROL_SAM_FREQ << 8,
542 snd_usb_ctrl_intf(chip) | (clock << 8),
543 &data, sizeof(data));
544 if (err < 0) {
545 usb_audio_err(chip,
546 "%d:%d: cannot set freq %d (v2/v3): err %d\n",
547 iface, fmt->altsetting, rate, err);
548 return err;
549 }
550
551 cur_rate = get_sample_rate_v2v3(chip, iface,
552 fmt->altsetting, clock);
553 } else {
554 cur_rate = prev_rate;
555 }
556
557 if (cur_rate != rate) {
558 if (!writeable) {
559 usb_audio_warn(chip,
560 "%d:%d: freq mismatch (RO clock): req %d, clock runs @%d\n",
561 iface, fmt->altsetting, rate, cur_rate);
562 return -ENXIO;
563 }
564 usb_audio_dbg(chip,
565 "current rate %d is different from the runtime rate %d\n",
566 cur_rate, rate);
567 }
568
569 /* Some devices doesn't respond to sample rate changes while the
570 * interface is active. */
571 if (rate != prev_rate) {
572 usb_set_interface(dev, iface, 0);
573 snd_usb_set_interface_quirk(dev);
574 usb_set_interface(dev, iface, fmt->altsetting);
575 snd_usb_set_interface_quirk(dev);
576 }
577
578 return 0;
579}
580
581int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
582 struct usb_host_interface *alts,
583 struct audioformat *fmt, int rate)
584{
585 switch (fmt->protocol) {
586 case UAC_VERSION_1:
587 default:
588 return set_sample_rate_v1(chip, iface, alts, fmt, rate);
589
590 case UAC_VERSION_2:
591 case UAC_VERSION_3:
592 return set_sample_rate_v2v3(chip, iface, alts, fmt, rate);
593 }
594}
595