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ALSA: usb-audio: fix Line6 Helix audio format rates

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Line6 Helix and HX stomp devices don't support retrieving
the number of clock sample rate.

Add a quirk to set it to 48Khz by default.

[ fixed wrong variable initialization changes by tiwai ]

Signed-off-by: Nicola Lunghi <nick83ola@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Nicola Lunghi 2019-07-07 09:27:34 +01:00 committed by Takashi Iwai
parent ba18ca2b8e
commit d4bd305326
1 changed files with 43 additions and 3 deletions
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46
sound/usb/format.c
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@ -298,6 +298,33 @@ static int parse_uac2_sample_rate_range(struct snd_usb_audio *chip,
return nr_rates;
}
/* Line6 Helix series don't support the UAC2_CS_RANGE usb function
* call. Return a static table of known clock rates.
*/
static int line6_parse_audio_format_rates_quirk(struct snd_usb_audio *chip,
struct audioformat *fp)
{
switch (chip->usb_id) {
case USB_ID(0x0E41, 0x4241): /* Line6 Helix */
case USB_ID(0x0E41, 0x4242): /* Line6 Helix Rack */
case USB_ID(0x0E41, 0x4244): /* Line6 Helix LT */
case USB_ID(0x0E41, 0x4246): /* Line6 HX-Stomp */
/* supported rates: 48Khz */
kfree(fp->rate_table);
fp->rate_table = kmalloc(sizeof(int), GFP_KERNEL);
if (!fp->rate_table)
return -ENOMEM;
fp->nr_rates = 1;
fp->rate_min = 48000;
fp->rate_max = 48000;
fp->rates = SNDRV_PCM_RATE_48000;
fp->rate_table[0] = 48000;
return 0;
}
return -ENODEV;
}
/*
* parse the format descriptor and stores the possible sample rates
* on the audioformat table (audio class v2 and v3).
@ -307,7 +334,7 @@ static int parse_audio_format_rates_v2v3(struct snd_usb_audio *chip,
{
struct usb_device *dev = chip->dev;
unsigned char tmp[2], *data;
int nr_triplets, data_size, ret = 0;
int nr_triplets, data_size, ret = 0, ret_l6;
int clock = snd_usb_clock_find_source(chip, fp->protocol,
fp->clock, false);
@ -326,9 +353,22 @@ static int parse_audio_format_rates_v2v3(struct snd_usb_audio *chip,
tmp, sizeof(tmp));
if (ret < 0) {
dev_err(&dev->dev,
"%s(): unable to retrieve number of sample rates (clock %d)\n",
/* line6 helix devices don't support UAC2_CS_CONTROL_SAM_FREQ call */
ret_l6 = line6_parse_audio_format_rates_quirk(chip, fp);
if (ret_l6 == -ENODEV) {
/* no line6 device found continue showing the error */
dev_err(&dev->dev,
"%s(): unable to retrieve number of sample rates (clock %d)\n",
__func__, clock);
goto err;
}
if (ret_l6 == 0) {
dev_info(&dev->dev,
"%s(): unable to retrieve number of sample rates: set it to a predefined value (clock %d).\n",
__func__, clock);
return 0;
}
ret = ret_l6;
goto err;
}