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;
unsigned char data[4];
int err, crate;
int clock = snd_usb_clock_find_source(chip, fmt->clock);
if (clock < 0)
return clock;
if (!uac_clock_source_is_valid(chip, clock)) {
/* TODO: should we try to find valid clock setups by ourself? */
snd_printk(KERN_ERR "%d:%d:%d: clock source %d is not valid, cannot use\n",
dev->devnum, iface, fmt->altsetting, clock);
return -ENXIO;
}
data[0] = rate;
data[1] = rate >> 8;
data[2] = rate >> 16;
data[3] = rate >> 24;
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), 1000)) < 0) {
snd_printk(KERN_ERR "%d:%d:%d: cannot set freq %d (v2)\n",
dev->devnum, iface, fmt->altsetting, rate);
return err;
}
if ((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), 1000)) < 0) {
#ifdef CONFIG_DEBUG_PRINTK
snd_printk(KERN_WARNING "%d:%d:%d: cannot get freq (v2)\n",
dev->devnum, iface, fmt->altsetting);
#else
;
#endif
return err;
}
crate = data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
if (crate != rate)
snd_printd(KERN_WARNING "current rate %d is different from the runtime rate %d\n", crate, rate);
return 0;
}
/*
* parse the format descriptor and stores the possible sample rates
* on the audioformat table (audio class v2).
*/
static int parse_audio_format_rates_v2(struct snd_usb_audio *chip,
struct audioformat *fp)
{
struct usb_device *dev = chip->dev;
unsigned char tmp[2], *data;
int nr_triplets, data_size, ret = 0;
int clock = snd_usb_clock_find_source(chip, fp->clock, false);
if (clock < 0) {
dev_err(&dev->dev,
"%s(): unable to find clock source (clock %d)\n",
__func__, clock);
goto err;
}
/* get the number of sample rates first by only fetching 2 bytes */
ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
UAC2_CS_CONTROL_SAM_FREQ << 8,
snd_usb_ctrl_intf(chip) | (clock << 8),
tmp, sizeof(tmp));
if (ret < 0) {
dev_err(&dev->dev,
"%s(): unable to retrieve number of sample rates (clock %d)\n",
__func__, clock);
goto err;
}
nr_triplets = (tmp[1] << 8) | tmp[0];
data_size = 2 + 12 * nr_triplets;
data = kzalloc(data_size, GFP_KERNEL);
if (!data) {
ret = -ENOMEM;
goto err;
}
/* now get the full information */
ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
UAC2_CS_CONTROL_SAM_FREQ << 8,
snd_usb_ctrl_intf(chip) | (clock << 8),
data, data_size);
if (ret < 0) {
dev_err(&dev->dev,
"%s(): unable to retrieve sample rate range (clock %d)\n",
__func__, clock);
ret = -EINVAL;
goto err_free;
}
/* Call the triplet parser, and make sure fp->rate_table is NULL.
* We just use the return value to know how many sample rates we
* will have to deal with. */
kfree(fp->rate_table);
fp->rate_table = NULL;
fp->nr_rates = parse_uac2_sample_rate_range(chip, fp, nr_triplets, data);
if (fp->nr_rates == 0) {
/* SNDRV_PCM_RATE_CONTINUOUS */
ret = 0;
goto err_free;
}
fp->rate_table = kmalloc(sizeof(int) * fp->nr_rates, GFP_KERNEL);
if (!fp->rate_table) {
ret = -ENOMEM;
goto err_free;
}
/* Call the triplet parser again, but this time, fp->rate_table is
* allocated, so the rates will be stored */
parse_uac2_sample_rate_range(chip, fp, nr_triplets, data);
err_free:
kfree(data);
err:
return ret;
}
static int set_sample_rate_v2v3(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;
u32 bmControls;
/* First, try to find a valid clock. This may trigger
* automatic clock selection if the current clock is not
* valid.
*/
clock = snd_usb_clock_find_source(chip, fmt->protocol,
fmt->clock, true);
if (clock < 0) {
/* We did not find a valid clock, but that might be
* because the current sample rate does not match an
* external clock source. Try again without validation
* and we will do another validation after setting the
* rate.
*/
clock = snd_usb_clock_find_source(chip, fmt->protocol,
fmt->clock, false);
if (clock < 0)
return clock;
}
prev_rate = get_sample_rate_v2v3(chip, iface, fmt->altsetting, clock);
if (prev_rate == rate)
goto validation;
if (fmt->protocol == UAC_VERSION_3) {
struct uac3_clock_source_descriptor *cs_desc;
cs_desc = snd_usb_find_clock_source_v3(chip->ctrl_intf, clock);
bmControls = le32_to_cpu(cs_desc->bmControls);
} else {
struct uac_clock_source_descriptor *cs_desc;
cs_desc = snd_usb_find_clock_source(chip->ctrl_intf, clock);
bmControls = cs_desc->bmControls;
}
writeable = uac_v2v3_control_is_writeable(bmControls,
UAC2_CS_CONTROL_SAM_FREQ);
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) {
usb_audio_err(chip,
"%d:%d: cannot set freq %d (v2/v3): err %d\n",
iface, fmt->altsetting, rate, err);
return err;
}
cur_rate = get_sample_rate_v2v3(chip, iface,
fmt->altsetting, clock);
} else {
cur_rate = prev_rate;
}
if (cur_rate != rate) {
if (!writeable) {
usb_audio_warn(chip,
"%d:%d: freq mismatch (RO clock): req %d, clock runs @%d\n",
iface, fmt->altsetting, rate, cur_rate);
return -ENXIO;
}
usb_audio_dbg(chip,
"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);
}
validation:
/* validate clock after rate change */
if (!uac_clock_source_is_valid(chip, fmt->protocol, clock))
return -ENXIO;
return 0;
}
