[GitHub/mt8127/android_kernel_alcatel_ttab.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"
#include "quirks.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 || !chip->autoclock)
			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): err %d\n",
			   dev->devnum, iface, altsetting, err);
		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;
	bool writeable;
	struct uac_clock_source_descriptor *cs_desc;

	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);
	if (prev_rate == rate)
		return 0;

	cs_desc = snd_usb_find_clock_source(chip->ctrl_intf, clock);
	writeable = uac2_control_is_writeable(cs_desc->bmControls, UAC2_CS_CONTROL_SAM_FREQ - 1);
	if (writeable) {
		data = cpu_to_le32(rate);
		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));
		if (err < 0) {
			snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d (v2): err %d\n",
				   dev->devnum, iface, fmt->altsetting, rate, err);
			return err;
		}

		cur_rate = get_sample_rate_v2(chip, iface, fmt->altsetting, clock);
	} else {
		cur_rate = prev_rate;
	}

	if (cur_rate != rate) {
		if (!writeable) {
			snd_printk(KERN_WARNING
				   "%d:%d:%d: freq mismatch (RO clock): req %d, clock runs @%d\n",
				   dev->devnum, iface, fmt->altsetting, rate, cur_rate);
			return -ENXIO;
		}
		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);
		snd_usb_set_interface_quirk(dev);
		usb_set_interface(dev, iface, fmt->altsetting);
		snd_usb_set_interface_quirk(dev);
	}

	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"
21bb5aaf	35	#include "quirks.h"
79f920fb DM	36
	37	static struct uac_clock_source_descriptor *
	38	snd_usb_find_clock_source(struct usb_host_interface *ctrl_iface,
	39	int clock_id)
	40	{
	41	struct uac_clock_source_descriptor *cs = NULL;
	42
	43	while ((cs = snd_usb_find_csint_desc(ctrl_iface->extra,
	44	ctrl_iface->extralen,
	45	cs, UAC2_CLOCK_SOURCE))) {
	46	if (cs->bClockID == clock_id)
	47	return cs;
	48	}
	49
	50	return NULL;
	51	}
	52
	53	static struct uac_clock_selector_descriptor *
	54	snd_usb_find_clock_selector(struct usb_host_interface *ctrl_iface,
	55	int clock_id)
	56	{
	57	struct uac_clock_selector_descriptor *cs = NULL;
	58
	59	while ((cs = snd_usb_find_csint_desc(ctrl_iface->extra,
	60	ctrl_iface->extralen,
	61	cs, UAC2_CLOCK_SELECTOR))) {
	62	if (cs->bClockID == clock_id)
	63	return cs;
	64	}
	65
	66	return NULL;
	67	}
	68
	69	static struct uac_clock_multiplier_descriptor *
	70	snd_usb_find_clock_multiplier(struct usb_host_interface *ctrl_iface,
	71	int clock_id)
	72	{
	73	struct uac_clock_multiplier_descriptor *cs = NULL;
	74
	75	while ((cs = snd_usb_find_csint_desc(ctrl_iface->extra,
	76	ctrl_iface->extralen,
	77	cs, UAC2_CLOCK_MULTIPLIER))) {
	78	if (cs->bClockID == clock_id)
	79	return cs;
	80	}
	81
	82	return NULL;
	83	}
	84
	85	static int uac_clock_selector_get_val(struct snd_usb_audio *chip, int selector_id)
	86	{
	87	unsigned char buf;
	88	int ret;
	89
	90	ret = snd_usb_ctl_msg(chip->dev, usb_rcvctrlpipe(chip->dev, 0),
	91	UAC2_CS_CUR,
	92	USB_RECIP_INTERFACE \| USB_TYPE_CLASS \| USB_DIR_IN,
11bcbc44 DM	93	UAC2_CX_CLOCK_SELECTOR << 8,
11bcbc44 DM	94	snd_usb_ctrl_intf(chip) \| (selector_id << 8),
17d900c4	95	&buf, sizeof(buf));
79f920fb DM	96
	97	if (ret < 0)
	98	return ret;
	99
	100	return buf;
	101	}
	102
8c55af3f EZ	103	static int uac_clock_selector_set_val(struct snd_usb_audio *chip, int selector_id,
	104	unsigned char pin)
	105	{
	106	int ret;
	107
	108	ret = snd_usb_ctl_msg(chip->dev, usb_sndctrlpipe(chip->dev, 0),
	109	UAC2_CS_CUR,
	110	USB_RECIP_INTERFACE \| USB_TYPE_CLASS \| USB_DIR_OUT,
	111	UAC2_CX_CLOCK_SELECTOR << 8,
	112	snd_usb_ctrl_intf(chip) \| (selector_id << 8),
	113	&pin, sizeof(pin));
	114	if (ret < 0)
	115	return ret;
	116
	117	if (ret != sizeof(pin)) {
	118	snd_printk(KERN_ERR
	119	"usb-audio:%d: setting selector (id %d) unexpected length %d\n",
	120	chip->dev->devnum, selector_id, ret);
	121	return -EINVAL;
	122	}
	123
	124	ret = uac_clock_selector_get_val(chip, selector_id);
	125	if (ret < 0)
	126	return ret;
	127
	128	if (ret != pin) {
	129	snd_printk(KERN_ERR
	130	"usb-audio:%d: setting selector (id %d) to %x failed (current: %d)\n",
	131	chip->dev->devnum, selector_id, pin, ret);
	132	return -EINVAL;
	133	}
	134
	135	return ret;
	136	}
	137
79f920fb DM	138	static bool uac_clock_source_is_valid(struct snd_usb_audio *chip, int source_id)
	139	{
	140	int err;
	141	unsigned char data;
	142	struct usb_device *dev = chip->dev;
3bc6fbc7 DM	143	struct uac_clock_source_descriptor *cs_desc =
	144	snd_usb_find_clock_source(chip->ctrl_intf, source_id);
	145
	146	if (!cs_desc)
	147	return 0;
	148
	149	/* If a clock source can't tell us whether it's valid, we assume it is */
aff252a8 DM	150	if (!uac2_control_is_readable(cs_desc->bmControls,
aff252a8 DM	151	UAC2_CS_CONTROL_CLOCK_VALID - 1))
3bc6fbc7	152	return 1;
79f920fb DM	153
	154	err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
	155	USB_TYPE_CLASS \| USB_RECIP_INTERFACE \| USB_DIR_IN,
11bcbc44 DM	156	UAC2_CS_CONTROL_CLOCK_VALID << 8,
11bcbc44 DM	157	snd_usb_ctrl_intf(chip) \| (source_id << 8),
17d900c4	158	&data, sizeof(data));
79f920fb DM	159
	160	if (err < 0) {
	161	snd_printk(KERN_WARNING "%s(): cannot get clock validity for id %d\n",
	162	__func__, source_id);
3bc6fbc7	163	return 0;
79f920fb DM	164	}
	165
	166	return !!data;
	167	}
	168
79f920fb	169	static int __uac_clock_find_source(struct snd_usb_audio *chip,
06ffc1eb EZ	170	int entity_id, unsigned long *visited,
06ffc1eb EZ	171	bool validate)
79f920fb DM	172	{
	173	struct uac_clock_source_descriptor *source;
	174	struct uac_clock_selector_descriptor *selector;
	175	struct uac_clock_multiplier_descriptor *multiplier;
	176
	177	entity_id &= 0xff;
	178
	179	if (test_and_set_bit(entity_id, visited)) {
	180	snd_printk(KERN_WARNING
	181	"%s(): recursive clock topology detected, id %d.\n",
	182	__func__, entity_id);
	183	return -EINVAL;
	184	}
	185
	186	/* first, see if the ID we're looking for is a clock source already */
3d8d4dcf	187	source = snd_usb_find_clock_source(chip->ctrl_intf, entity_id);
06ffc1eb EZ	188	if (source) {
	189	entity_id = source->bClockID;
	190	if (validate && !uac_clock_source_is_valid(chip, entity_id)) {
	191	snd_printk(KERN_ERR "usb-audio:%d: clock source %d is not valid, cannot use\n",
	192	chip->dev->devnum, entity_id);
	193	return -ENXIO;
	194	}
	195	return entity_id;
	196	}
79f920fb	197
3d8d4dcf	198	selector = snd_usb_find_clock_selector(chip->ctrl_intf, entity_id);
79f920fb	199	if (selector) {
8c55af3f	200	int ret, i, cur;
79f920fb DM	201
	202	/* the entity ID we are looking for is a selector.
	203	* find out what it currently selects */
	204	ret = uac_clock_selector_get_val(chip, selector->bClockID);
	205	if (ret < 0)
	206	return ret;
	207
157a57b6 DM	208	/* Selector values are one-based */
157a57b6 DM	209
79f920fb	210	if (ret > selector->bNrInPins \|\| ret < 1) {
06ffc1eb	211	snd_printk(KERN_ERR
79f920fb DM	212	"%s(): selector reported illegal value, id %d, ret %d\n",
	213	__func__, selector->bClockID, ret);
	214
	215	return -EINVAL;
	216	}
	217
8c55af3f EZ	218	cur = ret;
8c55af3f EZ	219	ret = __uac_clock_find_source(chip, selector->baCSourceID[ret - 1],
06ffc1eb	220	visited, validate);
ef02e29b	221	if (!validate \|\| ret > 0 \|\| !chip->autoclock)
8c55af3f EZ	222	return ret;
	223
	224	/* The current clock source is invalid, try others. */
	225	for (i = 1; i <= selector->bNrInPins; i++) {
	226	int err;
	227
	228	if (i == cur)
	229	continue;
	230
	231	ret = __uac_clock_find_source(chip, selector->baCSourceID[i - 1],
	232	visited, true);
	233	if (ret < 0)
	234	continue;
	235
	236	err = uac_clock_selector_set_val(chip, entity_id, i);
	237	if (err < 0)
	238	continue;
	239
	240	snd_printk(KERN_INFO
	241	"usb-audio:%d: found and selected valid clock source %d\n",
	242	chip->dev->devnum, ret);
	243	return ret;
	244	}
	245
	246	return -ENXIO;
79f920fb DM	247	}
	248
	249	/* FIXME: multipliers only act as pass-thru element for now */
3d8d4dcf	250	multiplier = snd_usb_find_clock_multiplier(chip->ctrl_intf, entity_id);
79f920fb	251	if (multiplier)
3d8d4dcf	252	return __uac_clock_find_source(chip, multiplier->bCSourceID,
06ffc1eb	253	visited, validate);
79f920fb DM	254
	255	return -EINVAL;
	256	}
	257
157a57b6 DM	258	/*
	259	* For all kinds of sample rate settings and other device queries,
	260	* the clock source (end-leaf) must be used. However, clock selectors,
	261	* clock multipliers and sample rate converters may be specified as
	262	* clock source input to terminal. This functions walks the clock path
	263	* to its end and tries to find the source.
	264	*
	265	* The 'visited' bitfield is used internally to detect recursive loops.
	266	*
	267	* Returns the clock source UnitID (>=0) on success, or an error.
	268	*/
06ffc1eb EZ	269	int snd_usb_clock_find_source(struct snd_usb_audio *chip, int entity_id,
06ffc1eb EZ	270	bool validate)
79f920fb DM	271	{
	272	DECLARE_BITMAP(visited, 256);
	273	memset(visited, 0, sizeof(visited));
06ffc1eb	274	return __uac_clock_find_source(chip, entity_id, visited, validate);
79f920fb DM	275	}
	276
	277	static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
	278	struct usb_host_interface *alts,
	279	struct audioformat *fmt, int rate)
	280	{
	281	struct usb_device *dev = chip->dev;
	282	unsigned int ep;
	283	unsigned char data[3];
	284	int err, crate;
	285
	286	ep = get_endpoint(alts, 0)->bEndpointAddress;
	287
	288	/* if endpoint doesn't have sampling rate control, bail out */
d32d552e	289	if (!(fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE))
79f920fb	290	return 0;
79f920fb DM	291
	292	data[0] = rate;
	293	data[1] = rate >> 8;
	294	data[2] = rate >> 16;
	295	if ((err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
	296	USB_TYPE_CLASS \| USB_RECIP_ENDPOINT \| USB_DIR_OUT,
	297	UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
17d900c4	298	data, sizeof(data))) < 0) {
79f920fb DM	299	snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d to ep %#x\n",
	300	dev->devnum, iface, fmt->altsetting, rate, ep);
	301	return err;
	302	}
	303
	304	if ((err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC_GET_CUR,
	305	USB_TYPE_CLASS \| USB_RECIP_ENDPOINT \| USB_DIR_IN,
	306	UAC_EP_CS_ATTR_SAMPLE_RATE << 8, ep,
17d900c4	307	data, sizeof(data))) < 0) {
79f920fb DM	308	snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq at ep %#x\n",
	309	dev->devnum, iface, fmt->altsetting, ep);
	310	return 0; /* some devices don't support reading */
	311	}
	312
	313	crate = data[0] \| (data[1] << 8) \| (data[2] << 16);
	314	if (crate != rate) {
	315	snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
	316	// runtime->rate = crate;
	317	}
	318
	319	return 0;
	320	}
	321
7c517465 TI	322	static int get_sample_rate_v2(struct snd_usb_audio *chip, int iface,
	323	int altsetting, int clock)
	324	{
	325	struct usb_device *dev = chip->dev;
f6a8bc70	326	__le32 data;
7c517465 TI	327	int err;
	328
	329	err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
	330	USB_TYPE_CLASS \| USB_RECIP_INTERFACE \| USB_DIR_IN,
	331	UAC2_CS_CONTROL_SAM_FREQ << 8,
	332	snd_usb_ctrl_intf(chip) \| (clock << 8),
f6a8bc70	333	&data, sizeof(data));
7c517465	334	if (err < 0) {
027bbc15 EZ	335	snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq (v2): err %d\n",
027bbc15 EZ	336	dev->devnum, iface, altsetting, err);
7c517465 TI	337	return 0;
	338	}
	339
f6a8bc70	340	return le32_to_cpu(data);
7c517465 TI	341	}
7c517465 TI	342
79f920fb DM	343	static int set_sample_rate_v2(struct snd_usb_audio *chip, int iface,
	344	struct usb_host_interface *alts,
	345	struct audioformat *fmt, int rate)
	346	{
	347	struct usb_device *dev = chip->dev;
f6a8bc70	348	__le32 data;
690a863f	349	int err, cur_rate, prev_rate;
8c55af3f	350	int clock;
1dc669fe EZ	351	bool writeable;
1dc669fe EZ	352	struct uac_clock_source_descriptor *cs_desc;
79f920fb	353
8c55af3f	354	clock = snd_usb_clock_find_source(chip, fmt->clock, true);
79f920fb DM	355	if (clock < 0)
	356	return clock;
	357
7c517465	358	prev_rate = get_sample_rate_v2(chip, iface, fmt->altsetting, clock);
fa92dd77 DH	359	if (prev_rate == rate)
fa92dd77 DH	360	return 0;
690a863f	361
1dc669fe EZ	362	cs_desc = snd_usb_find_clock_source(chip->ctrl_intf, clock);
	363	writeable = uac2_control_is_writeable(cs_desc->bmControls, UAC2_CS_CONTROL_SAM_FREQ - 1);
	364	if (writeable) {
	365	data = cpu_to_le32(rate);
	366	err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
	367	USB_TYPE_CLASS \| USB_RECIP_INTERFACE \| USB_DIR_OUT,
	368	UAC2_CS_CONTROL_SAM_FREQ << 8,
	369	snd_usb_ctrl_intf(chip) \| (clock << 8),
	370	&data, sizeof(data));
	371	if (err < 0) {
	372	snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d (v2): err %d\n",
	373	dev->devnum, iface, fmt->altsetting, rate, err);
	374	return err;
	375	}
79f920fb	376
1dc669fe EZ	377	cur_rate = get_sample_rate_v2(chip, iface, fmt->altsetting, clock);
	378	} else {
	379	cur_rate = prev_rate;
	380	}
79f920fb	381
690a863f	382	if (cur_rate != rate) {
1dc669fe EZ	383	if (!writeable) {
	384	snd_printk(KERN_WARNING
	385	"%d:%d:%d: freq mismatch (RO clock): req %d, clock runs @%d\n",
	386	dev->devnum, iface, fmt->altsetting, rate, cur_rate);
	387	return -ENXIO;
	388	}
690a863f TH	389	snd_printd(KERN_WARNING
	390	"current rate %d is different from the runtime rate %d\n",
	391	cur_rate, rate);
	392	}
	393
	394	/* Some devices doesn't respond to sample rate changes while the
	395	* interface is active. */
	396	if (rate != prev_rate) {
	397	usb_set_interface(dev, iface, 0);
21bb5aaf	398	snd_usb_set_interface_quirk(dev);
690a863f	399	usb_set_interface(dev, iface, fmt->altsetting);
21bb5aaf	400	snd_usb_set_interface_quirk(dev);
690a863f	401	}
79f920fb DM	402
	403	return 0;
	404	}
	405
	406	int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
	407	struct usb_host_interface *alts,
	408	struct audioformat *fmt, int rate)
	409	{
	410	struct usb_interface_descriptor *altsd = get_iface_desc(alts);
	411
	412	switch (altsd->bInterfaceProtocol) {
	413	case UAC_VERSION_1:
a2acad82	414	default:
79f920fb DM	415	return set_sample_rate_v1(chip, iface, alts, fmt, rate);
	416
	417	case UAC_VERSION_2:
	418	return set_sample_rate_v2(chip, iface, alts, fmt, rate);
	419	}
79f920fb DM	420	}
79f920fb DM	421