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.

Signed-off-by: Nicola Lunghi nick83ola@gmail.com --- sound/usb/format.c | 46 +++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 43 insertions(+), 3 deletions(-)

diff --git a/sound/usb/format.c b/sound/usb/format.c index c02b51a82775..31780dfb8eb9 100644 --- a/sound/usb/format.c +++ b/sound/usb/format.c @@ -285,6 +285,33 @@ 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). @@ -294,7 +321,7 @@ 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, ret_l6 = 0; int clock = snd_usb_clock_find_source(chip, fp->protocol, fp->clock, false);

@@ -313,9 +340,22 @@ 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; }