[linux-2.6-block.git] / sound / usb / clock.c

/*
 *   Clock domain and sample rate management functions
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
#include <linux/usb/audio-v2.h>

#include <sound/core.h>
#include <sound/info.h>
#include <sound/pcm.h>

#include "usbaudio.h"
#include "card.h"
#include "helper.h"
#include "clock.h"

static struct uac_clock_source_descriptor *
	snd_usb_find_clock_source(struct usb_host_interface *ctrl_iface,
				  int clock_id)
{
	struct uac_clock_source_descriptor *cs = NULL;

	while ((cs = snd_usb_find_csint_desc(ctrl_iface->extra,
					     ctrl_iface->extralen,
					     cs, UAC2_CLOCK_SOURCE))) {
		if (cs->bClockID == clock_id)
			return cs;
	}

	return NULL;
}

static struct uac_clock_selector_descriptor *
	snd_usb_find_clock_selector(struct usb_host_interface *ctrl_iface,
				    int clock_id)
{
	struct uac_clock_selector_descriptor *cs = NULL;

	while ((cs = snd_usb_find_csint_desc(ctrl_iface->extra,
					     ctrl_iface->extralen,
					     cs, UAC2_CLOCK_SELECTOR))) {
		if (cs->bClockID == clock_id)
			return cs;
	}

	return NULL;
}

static struct uac_clock_multiplier_descriptor *
	snd_usb_find_clock_multiplier(struct usb_host_interface *ctrl_iface,
				      int clock_id)
{
	struct uac_clock_multiplier_descriptor *cs = NULL;

	while ((cs = snd_usb_find_csint_desc(ctrl_iface->extra,
					     ctrl_iface->extralen,
					     cs, UAC2_CLOCK_MULTIPLIER))) {
		if (cs->bClockID == clock_id)
			return cs;
	}

	return NULL;
}

static int uac_clock_selector_get_val(struct snd_usb_audio *chip, int selector_id)
{
	unsigned char buf;
	int ret;

	ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0),
			      UAC2_CS_CUR,
			      USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
			      UAC2_CX_CLOCK_SELECTOR << 8,
			      snd_usb_ctrl_intf(chip) | (selector_id << 8),
			      &buf, sizeof(buf));

	if (ret < 0)
		return ret;

	return buf;
}

static int uac_clock_selector_set_val(struct snd_usb_audio *chip, int selector_id,
					unsigned char pin)
{
	int ret;

	ret = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0),
			      UAC2_CS_CUR,
			      USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_OUT,
			      UAC2_CX_CLOCK_SELECTOR << 8,
			      snd_usb_ctrl_intf(chip) | (selector_id << 8),
			      &pin, sizeof(pin));
	if (ret < 0)
		return ret;

	if (ret != sizeof(pin)) {
		snd_printk(KERN_ERR
			"usb-audio:%d: setting selector (id %d) unexpected length %d\n",
			chip->dev->devnum, selector_id, ret);
		return -EINVAL;
	}

	ret = uac_clock_selector_get_val(chip, selector_id);
	if (ret < 0)
		return ret;

	if (ret != pin) {
		snd_printk(KERN_ERR
			"usb-audio:%d: setting selector (id %d) to %x failed (current: %d)\n",
			chip->dev->devnum, selector_id, pin, ret);
		return -EINVAL;
	}

	return ret;
}

static bool uac_clock_source_is_valid(struct snd_usb_audio *chip, int source_id)
{
	int err;
	unsigned char data;
	struct usb_device *dev = chip->dev;
	struct uac_clock_source_descriptor *cs_desc =
		snd_usb_find_clock_source(chip->ctrl_intf, source_id);

	if (!cs_desc)
		return 0;

	/* If a clock source can't tell us whether it's valid, we assume it is */
	if (!uac2_control_is_readable(cs_desc->bmControls,
				      UAC2_CS_CONTROL_CLOCK_VALID - 1))
		return 1;

	err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
			      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
			      UAC2_CS_CONTROL_CLOCK_VALID << 8,
			      snd_usb_ctrl_intf(chip) | (source_id << 8),
			      &data, sizeof(data));

	if (err < 0) {
		snd_printk(KERN_WARNING "%s(): cannot get clock validity for id %d\n",
			   __func__, source_id);
		return 0;
	}

	return !!data;
}

static int __uac_clock_find_source(struct snd_usb_audio *chip,
				   int entity_id, unsigned long *visited,
				   bool validate)
{
	struct uac_clock_source_descriptor *source;
	struct uac_clock_selector_descriptor *selector;
	struct uac_clock_multiplier_descriptor *multiplier;

	entity_id &= 0xff;

	if (test_and_set_bit(entity_id, visited)) {
		snd_printk(KERN_WARNING
			"%s(): recursive clock topology detected, id %d.\n",
			__func__, entity_id);
		return -EINVAL;
	}

	/* first, see if the ID we're looking for is a clock source already */
	source = snd_usb_find_clock_source(chip->ctrl_intf, entity_id);
	if (source) {
		entity_id = source->bClockID;
		if (validate && !uac_clock_source_is_valid(chip, entity_id)) {
			snd_printk(KERN_ERR "usb-audio:%d: clock source %d is not valid, cannot use\n",
				   chip->dev->devnum, entity_id);
			return -ENXIO;
		}
		return entity_id;
	}

	selector = snd_usb_find_clock_selector(chip->ctrl_intf, entity_id);
	if (selector) {
		int ret, i, cur;

		/* the entity ID we are looking for is a selector.
		 * find out what it currently selects */
		ret = uac_clock_selector_get_val(chip, selector->bClockID);
		if (ret < 0)
			return ret;

		/* Selector values are one-based */

		if (ret > selector->bNrInPins || ret < 1) {
			snd_printk(KERN_ERR
				"%s(): selector reported illegal value, id %d, ret %d\n",
				__func__, selector->bClockID, ret);

			return -EINVAL;
		}

		cur = ret;
		ret = __uac_clock_find_source(chip, selector->baCSourceID[ret - 1],
					       visited, validate);
		if (!validate || ret > 0)
			return ret;

		/* The current clock source is invalid, try others. */
		for (i = 1; i <= selector->bNrInPins; i++) {
			int err;

			if (i == cur)
				continue;

			ret = __uac_clock_find_source(chip, selector->baCSourceID[i - 1],
				visited, true);
			if (ret < 0)
				continue;

			err = uac_clock_selector_set_val(chip, entity_id, i);
			if (err < 0)
				continue;

			snd_printk(KERN_INFO
				"usb-audio:%d: found and selected valid clock source %d\n",
				chip->dev->devnum, ret);
			return ret;
		}

		return -ENXIO;
	}

	/* FIXME: multipliers only act as pass-thru element for now */
	multiplier = snd_usb_find_clock_multiplier(chip->ctrl_intf, entity_id);
	if (multiplier)
		return __uac_clock_find_source(chip, multiplier->bCSourceID,
						visited, validate);

	return -EINVAL;
}

/*
 * For all kinds of sample rate settings and other device queries,
 * the clock source (end-leaf) must be used. However, clock selectors,
 * clock multipliers and sample rate converters may be specified as
 * clock source input to terminal. This functions walks the clock path
 * to its end and tries to find the source.
 *
 * The 'visited' bitfield is used internally to detect recursive loops.
 *
 * Returns the clock source UnitID (>=0) on success, or an error.
 */
int snd_usb_clock_find_source(struct snd_usb_audio *chip, int entity_id,
			      bool validate)
{
	DECLARE_BITMAP(visited, 256);
	memset(visited, 0, sizeof(visited));
	return __uac_clock_find_source(chip, entity_id, visited, validate);
}

static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
			      struct usb_host_interface *alts,
			      struct audioformat *fmt, int rate)
{
	struct usb_device *dev = chip->dev;
	unsigned int ep;
	unsigned char data[3];
	int err, crate;

	ep = get_endpoint(alts, 0)->bEndpointAddress;

	/* if endpoint doesn't have sampling rate control, bail out */
	if (!(fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE))
		return 0;

	data[0] = rate;
	data[1] = rate >> 8;
	data[2] = rate >> 16;
	if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
				   USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
				   UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
				   data, sizeof(data))) < 0) {
		snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d to ep %#x\n",
			   dev->devnum, iface, fmt->altsetting, rate, ep);
		return err;
	}

	if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR,
				   USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_IN,
				   UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
				   data, sizeof(data))) < 0) {
		snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq at ep %#x\n",
			   dev->devnum, iface, fmt->altsetting, ep);
		return 0; /* some devices don't support reading */
	}

	crate = data[0] | (data[1] << 8) | (data[2] << 16);
	if (crate != rate) {
		snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
		// runtime->rate = crate;
	}

	return 0;
}

static int get_sample_rate_v2(struct snd_usb_audio *chip, int iface,
			      int altsetting, int clock)
{
	struct usb_device *dev = chip->dev;
	__le32 data;
	int err;

	err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
			      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
			      UAC2_CS_CONTROL_SAM_FREQ << 8,
			      snd_usb_ctrl_intf(chip) | (clock << 8),
			      &data, sizeof(data));
	if (err < 0) {
		snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq (v2)\n",
			   dev->devnum, iface, altsetting);
		return 0;
	}

	return le32_to_cpu(data);
}

static int set_sample_rate_v2(struct snd_usb_audio *chip, int iface,
			      struct usb_host_interface *alts,
			      struct audioformat *fmt, int rate)
{
	struct usb_device *dev = chip->dev;
	__le32 data;
	int err, cur_rate, prev_rate;
	int clock;

	clock = snd_usb_clock_find_source(chip, fmt->clock, true);
	if (clock < 0)
		return clock;

	prev_rate = get_sample_rate_v2(chip, iface, fmt->altsetting, clock);

	data = cpu_to_le32(rate);
	if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
				   USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
				   UAC2_CS_CONTROL_SAM_FREQ << 8,
				   snd_usb_ctrl_intf(chip) | (clock << 8),
				   &data, sizeof(data))) < 0) {
		snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d (v2)\n",
			   dev->devnum, iface, fmt->altsetting, rate);
		return err;
	}

	cur_rate = get_sample_rate_v2(chip, iface, fmt->altsetting, clock);

	if (cur_rate != rate) {
		snd_printd(KERN_WARNING
			   "current rate %d is different from the runtime rate %d\n",
			   cur_rate, rate);
	}

	/* Some devices doesn't respond to sample rate changes while the
	 * interface is active. */
	if (rate != prev_rate) {
		usb_set_interface(dev, iface, 0);
		usb_set_interface(dev, iface, fmt->altsetting);
	}

	return 0;
}

int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
			     struct usb_host_interface *alts,
			     struct audioformat *fmt, int rate)
{
	struct usb_interface_descriptor *altsd = get_iface_desc(alts);

	switch (altsd->bInterfaceProtocol) {
	case UAC_VERSION_1:
	default:
		return set_sample_rate_v1(chip, iface, alts, fmt, rate);

	case UAC_VERSION_2:
		return set_sample_rate_v2(chip, iface, alts, fmt, rate);
	}
}
Commit	Line	Data
79f920fb DM	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>
79f920fb DM	22	#include <linux/string.h>
79f920fb DM	23	#include <linux/usb.h>
79f920fb DM	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>
79f920fb DM	30
	31	#include "usbaudio.h"
	32	#include "card.h"
79f920fb	33	#include "helper.h"
f22aa949	34	#include "clock.h"
79f920fb DM	35
	36	static 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
	52	static 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
	68	static 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
	84	static 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,
11bcbc44 DM	92	UAC2_CX_CLOCK_SELECTOR << 8,
11bcbc44 DM	93	snd_usb_ctrl_intf(chip) \| (selector_id << 8),
17d900c4	94	&buf, sizeof(buf));
79f920fb DM	95
	96	if (ret < 0)
	97	return ret;
	98
	99	return buf;
	100	}
	101
8c55af3f EZ	102	static int uac_clock_selector_set_val(struct snd_usb_audio *chip, int selector_id,
	103	unsigned char pin)
	104	{
	105	int ret;
	106
	107	ret = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0),
	108	UAC2_CS_CUR,
	109	USB_RECIP_INTERFACE \| USB_TYPE_CLASS \| USB_DIR_OUT,
	110	UAC2_CX_CLOCK_SELECTOR << 8,
	111	snd_usb_ctrl_intf(chip) \| (selector_id << 8),
	112	&pin, sizeof(pin));
	113	if (ret < 0)
	114	return ret;
	115
	116	if (ret != sizeof(pin)) {
	117	snd_printk(KERN_ERR
	118	"usb-audio:%d: setting selector (id %d) unexpected length %d\n",
	119	chip->dev->devnum, selector_id, ret);
	120	return -EINVAL;
	121	}
	122
	123	ret = uac_clock_selector_get_val(chip, selector_id);
	124	if (ret < 0)
	125	return ret;
	126
	127	if (ret != pin) {
	128	snd_printk(KERN_ERR
	129	"usb-audio:%d: setting selector (id %d) to %x failed (current: %d)\n",
	130	chip->dev->devnum, selector_id, pin, ret);
	131	return -EINVAL;
	132	}
	133
	134	return ret;
	135	}
	136
79f920fb DM	137	static bool uac_clock_source_is_valid(struct snd_usb_audio *chip, int source_id)
	138	{
	139	int err;
	140	unsigned char data;
	141	struct usb_device *dev = chip->dev;
3bc6fbc7 DM	142	struct uac_clock_source_descriptor *cs_desc =
	143	snd_usb_find_clock_source(chip->ctrl_intf, source_id);
	144
	145	if (!cs_desc)
	146	return 0;
	147
	148	/* If a clock source can't tell us whether it's valid, we assume it is */
aff252a8 DM	149	if (!uac2_control_is_readable(cs_desc->bmControls,
aff252a8 DM	150	UAC2_CS_CONTROL_CLOCK_VALID - 1))
3bc6fbc7	151	return 1;
79f920fb DM	152
	153	err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
	154	USB_TYPE_CLASS \| USB_RECIP_INTERFACE \| USB_DIR_IN,
11bcbc44 DM	155	UAC2_CS_CONTROL_CLOCK_VALID << 8,
11bcbc44 DM	156	snd_usb_ctrl_intf(chip) \| (source_id << 8),
17d900c4	157	&data, sizeof(data));
79f920fb DM	158
	159	if (err < 0) {
	160	snd_printk(KERN_WARNING "%s(): cannot get clock validity for id %d\n",
	161	__func__, source_id);
3bc6fbc7	162	return 0;
79f920fb DM	163	}
	164
	165	return !!data;
	166	}
	167
79f920fb	168	static int __uac_clock_find_source(struct snd_usb_audio *chip,
06ffc1eb EZ	169	int entity_id, unsigned long *visited,
06ffc1eb EZ	170	bool validate)
79f920fb DM	171	{
	172	struct uac_clock_source_descriptor *source;
	173	struct uac_clock_selector_descriptor *selector;
	174	struct uac_clock_multiplier_descriptor *multiplier;
	175
	176	entity_id &= 0xff;
	177
	178	if (test_and_set_bit(entity_id, visited)) {
	179	snd_printk(KERN_WARNING
	180	"%s(): recursive clock topology detected, id %d.\n",
	181	__func__, entity_id);
	182	return -EINVAL;
	183	}
	184
	185	/* first, see if the ID we're looking for is a clock source already */
3d8d4dcf	186	source = snd_usb_find_clock_source(chip->ctrl_intf, entity_id);
06ffc1eb EZ	187	if (source) {
	188	entity_id = source->bClockID;
	189	if (validate && !uac_clock_source_is_valid(chip, entity_id)) {
	190	snd_printk(KERN_ERR "usb-audio:%d: clock source %d is not valid, cannot use\n",
	191	chip->dev->devnum, entity_id);
	192	return -ENXIO;
	193	}
	194	return entity_id;
	195	}
79f920fb	196
3d8d4dcf	197	selector = snd_usb_find_clock_selector(chip->ctrl_intf, entity_id);
79f920fb	198	if (selector) {
8c55af3f	199	int ret, i, cur;
79f920fb DM	200
	201	/* the entity ID we are looking for is a selector.
	202	* find out what it currently selects */
	203	ret = uac_clock_selector_get_val(chip, selector->bClockID);
	204	if (ret < 0)
	205	return ret;
	206
157a57b6 DM	207	/* Selector values are one-based */
157a57b6 DM	208
79f920fb	209	if (ret > selector->bNrInPins \|\| ret < 1) {
06ffc1eb	210	snd_printk(KERN_ERR
79f920fb DM	211	"%s(): selector reported illegal value, id %d, ret %d\n",
	212	__func__, selector->bClockID, ret);
	213
	214	return -EINVAL;
	215	}
	216
8c55af3f EZ	217	cur = ret;
8c55af3f EZ	218	ret = __uac_clock_find_source(chip, selector->baCSourceID[ret - 1],
06ffc1eb	219	visited, validate);
8c55af3f EZ	220	if (!validate \|\| ret > 0)
	221	return ret;
	222
	223	/* The current clock source is invalid, try others. */
	224	for (i = 1; i <= selector->bNrInPins; i++) {
	225	int err;
	226
	227	if (i == cur)
	228	continue;
	229
	230	ret = __uac_clock_find_source(chip, selector->baCSourceID[i - 1],
	231	visited, true);
	232	if (ret < 0)
	233	continue;
	234
	235	err = uac_clock_selector_set_val(chip, entity_id, i);
	236	if (err < 0)
	237	continue;
	238
	239	snd_printk(KERN_INFO
	240	"usb-audio:%d: found and selected valid clock source %d\n",
	241	chip->dev->devnum, ret);
	242	return ret;
	243	}
	244
	245	return -ENXIO;
79f920fb DM	246	}
	247
	248	/* FIXME: multipliers only act as pass-thru element for now */
3d8d4dcf	249	multiplier = snd_usb_find_clock_multiplier(chip->ctrl_intf, entity_id);
79f920fb	250	if (multiplier)
3d8d4dcf	251	return __uac_clock_find_source(chip, multiplier->bCSourceID,
06ffc1eb	252	visited, validate);
79f920fb DM	253
	254	return -EINVAL;
	255	}
	256
157a57b6 DM	257	/*
	258	* For all kinds of sample rate settings and other device queries,
	259	* the clock source (end-leaf) must be used. However, clock selectors,
	260	* clock multipliers and sample rate converters may be specified as
	261	* clock source input to terminal. This functions walks the clock path
	262	* to its end and tries to find the source.
	263	*
	264	* The 'visited' bitfield is used internally to detect recursive loops.
	265	*
	266	* Returns the clock source UnitID (>=0) on success, or an error.
	267	*/
06ffc1eb EZ	268	int snd_usb_clock_find_source(struct snd_usb_audio *chip, int entity_id,
06ffc1eb EZ	269	bool validate)
79f920fb DM	270	{
	271	DECLARE_BITMAP(visited, 256);
	272	memset(visited, 0, sizeof(visited));
06ffc1eb	273	return __uac_clock_find_source(chip, entity_id, visited, validate);
79f920fb DM	274	}
	275
	276	static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
	277	struct usb_host_interface *alts,
	278	struct audioformat *fmt, int rate)
	279	{
	280	struct usb_device *dev = chip->dev;
	281	unsigned int ep;
	282	unsigned char data[3];
	283	int err, crate;
	284
	285	ep = get_endpoint(alts, 0)->bEndpointAddress;
	286
	287	/* if endpoint doesn't have sampling rate control, bail out */
d32d552e	288	if (!(fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE))
79f920fb	289	return 0;
79f920fb DM	290
	291	data[0] = rate;
	292	data[1] = rate >> 8;
	293	data[2] = rate >> 16;
	294	if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
	295	USB_TYPE_CLASS \| USB_RECIP_ENDPOINT \| USB_DIR_OUT,
	296	UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
17d900c4	297	data, sizeof(data))) < 0) {
79f920fb DM	298	snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d to ep %#x\n",
	299	dev->devnum, iface, fmt->altsetting, rate, ep);
	300	return err;
	301	}
	302
	303	if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR,
	304	USB_TYPE_CLASS \| USB_RECIP_ENDPOINT \| USB_DIR_IN,
	305	UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
17d900c4	306	data, sizeof(data))) < 0) {
79f920fb DM	307	snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq at ep %#x\n",
	308	dev->devnum, iface, fmt->altsetting, ep);
	309	return 0; /* some devices don't support reading */
	310	}
	311
	312	crate = data[0] \| (data[1] << 8) \| (data[2] << 16);
	313	if (crate != rate) {
	314	snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
	315	// runtime->rate = crate;
	316	}
	317
	318	return 0;
	319	}
	320
7c517465 TI	321	static int get_sample_rate_v2(struct snd_usb_audio *chip, int iface,
	322	int altsetting, int clock)
	323	{
	324	struct usb_device *dev = chip->dev;
f6a8bc70	325	__le32 data;
7c517465 TI	326	int err;
	327
	328	err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
	329	USB_TYPE_CLASS \| USB_RECIP_INTERFACE \| USB_DIR_IN,
	330	UAC2_CS_CONTROL_SAM_FREQ << 8,
	331	snd_usb_ctrl_intf(chip) \| (clock << 8),
f6a8bc70	332	&data, sizeof(data));
7c517465 TI	333	if (err < 0) {
	334	snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq (v2)\n",
	335	dev->devnum, iface, altsetting);
	336	return 0;
	337	}
	338
f6a8bc70	339	return le32_to_cpu(data);
7c517465 TI	340	}
7c517465 TI	341
79f920fb DM	342	static int set_sample_rate_v2(struct snd_usb_audio *chip, int iface,
	343	struct usb_host_interface *alts,
	344	struct audioformat *fmt, int rate)
	345	{
	346	struct usb_device *dev = chip->dev;
f6a8bc70	347	__le32 data;
690a863f	348	int err, cur_rate, prev_rate;
8c55af3f	349	int clock;
79f920fb	350
8c55af3f	351	clock = snd_usb_clock_find_source(chip, fmt->clock, true);
79f920fb DM	352	if (clock < 0)
	353	return clock;
	354
7c517465	355	prev_rate = get_sample_rate_v2(chip, iface, fmt->altsetting, clock);
690a863f	356
f6a8bc70	357	data = cpu_to_le32(rate);
79f920fb DM	358	if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
79f920fb DM	359	USB_TYPE_CLASS \| USB_RECIP_INTERFACE \| USB_DIR_OUT,
11bcbc44 DM	360	UAC2_CS_CONTROL_SAM_FREQ << 8,
11bcbc44 DM	361	snd_usb_ctrl_intf(chip) \| (clock << 8),
f6a8bc70	362	&data, sizeof(data))) < 0) {
79f920fb DM	363	snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d (v2)\n",
	364	dev->devnum, iface, fmt->altsetting, rate);
	365	return err;
	366	}
	367
7c517465	368	cur_rate = get_sample_rate_v2(chip, iface, fmt->altsetting, clock);
79f920fb	369
690a863f TH	370	if (cur_rate != rate) {
	371	snd_printd(KERN_WARNING
	372	"current rate %d is different from the runtime rate %d\n",
	373	cur_rate, rate);
	374	}
	375
	376	/* Some devices doesn't respond to sample rate changes while the
	377	* interface is active. */
	378	if (rate != prev_rate) {
	379	usb_set_interface(dev, iface, 0);
	380	usb_set_interface(dev, iface, fmt->altsetting);
	381	}
79f920fb DM	382
	383	return 0;
	384	}
	385
	386	int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
	387	struct usb_host_interface *alts,
	388	struct audioformat *fmt, int rate)
	389	{
	390	struct usb_interface_descriptor *altsd = get_iface_desc(alts);
	391
	392	switch (altsd->bInterfaceProtocol) {
	393	case UAC_VERSION_1:
a2acad82	394	default:
79f920fb DM	395	return set_sample_rate_v1(chip, iface, alts, fmt, rate);
	396
	397	case UAC_VERSION_2:
	398	return set_sample_rate_v2(chip, iface, alts, fmt, rate);
	399	}
79f920fb DM	400	}
79f920fb DM	401