From 1dc669fed61a4ec4270a89e5fb3535802cc45668 Mon Sep 17 00:00:00 2001 From: Eldad Zack Date: Wed, 3 Apr 2013 23:18:58 +0200 Subject: [PATCH] ALSA: usb-audio: UAC2: support read-only freq control Some clocks might be read-only, e.g., external clocks (see also UAC2 4.7.2.1). In this case, setting the sample frequency will always fail (even if the rate is equal to the current clock rate), therefore do not write, but read the value and compare to the requested rate. If the clock is read only, avoid reading it twice. If it doesn't match, return -ENXIO since the clock is invalid for this configuration. Signed-off-by: Eldad Zack Signed-off-by: Takashi Iwai --- sound/usb/clock.c | 37 ++++++++++++++++++++++++++----------- 1 file changed, 26 insertions(+), 11 deletions(-) diff --git a/sound/usb/clock.c b/sound/usb/clock.c index a694e1c42fdf..ae35e7d22e73 100644 --- a/sound/usb/clock.c +++ b/sound/usb/clock.c @@ -347,6 +347,8 @@ static int set_sample_rate_v2(struct snd_usb_audio *chip, int iface, __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) @@ -354,20 +356,33 @@ static int set_sample_rate_v2(struct snd_usb_audio *chip, int iface, 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): err %d\n", - dev->devnum, iface, fmt->altsetting, rate, err); - return err; - } + 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); + 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); -- 2.30.2