diff options
Diffstat (limited to 'sound/usb/clock.c')
| -rw-r--r-- | sound/usb/clock.c | 59 |
1 files changed, 25 insertions, 34 deletions
diff --git a/sound/usb/clock.c b/sound/usb/clock.c index b5855114667e..b853f8df794f 100644 --- a/sound/usb/clock.c +++ b/sound/usb/clock.c @@ -19,33 +19,19 @@ #include <linux/bitops.h> #include <linux/init.h> -#include <linux/list.h> -#include <linux/slab.h> #include <linux/string.h> #include <linux/usb.h> -#include <linux/moduleparam.h> -#include <linux/mutex.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 <sound/pcm_params.h> -#include <sound/initval.h> #include "usbaudio.h" #include "card.h" -#include "midi.h" -#include "mixer.h" -#include "proc.h" -#include "quirks.h" -#include "endpoint.h" #include "helper.h" -#include "debug.h" -#include "pcm.h" -#include "urb.h" -#include "format.h" +#include "clock.h" static struct uac_clock_source_descriptor * snd_usb_find_clock_source(struct usb_host_interface *ctrl_iface, @@ -134,10 +120,7 @@ static bool uac_clock_source_is_valid(struct snd_usb_audio *chip, int source_id) return !!data; } -/* Try to find the clock source ID of a given clock entity */ - static int __uac_clock_find_source(struct snd_usb_audio *chip, - struct usb_host_interface *host_iface, int entity_id, unsigned long *visited) { struct uac_clock_source_descriptor *source; @@ -154,11 +137,11 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, } /* first, see if the ID we're looking for is a clock source already */ - source = snd_usb_find_clock_source(host_iface, entity_id); + source = snd_usb_find_clock_source(chip->ctrl_intf, entity_id); if (source) return source->bClockID; - selector = snd_usb_find_clock_selector(host_iface, entity_id); + selector = snd_usb_find_clock_selector(chip->ctrl_intf, entity_id); if (selector) { int ret; @@ -168,6 +151,8 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, if (ret < 0) return ret; + /* Selector values are one-based */ + if (ret > selector->bNrInPins || ret < 1) { printk(KERN_ERR "%s(): selector reported illegal value, id %d, ret %d\n", @@ -176,27 +161,35 @@ static int __uac_clock_find_source(struct snd_usb_audio *chip, return -EINVAL; } - return __uac_clock_find_source(chip, host_iface, - selector->baCSourceID[ret-1], + return __uac_clock_find_source(chip, selector->baCSourceID[ret-1], visited); } /* FIXME: multipliers only act as pass-thru element for now */ - multiplier = snd_usb_find_clock_multiplier(host_iface, entity_id); + multiplier = snd_usb_find_clock_multiplier(chip->ctrl_intf, entity_id); if (multiplier) - return __uac_clock_find_source(chip, host_iface, - multiplier->bCSourceID, visited); + return __uac_clock_find_source(chip, multiplier->bCSourceID, + visited); return -EINVAL; } -int snd_usb_clock_find_source(struct snd_usb_audio *chip, - struct usb_host_interface *host_iface, - int entity_id) +/* + * 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) { DECLARE_BITMAP(visited, 256); memset(visited, 0, sizeof(visited)); - return __uac_clock_find_source(chip, host_iface, entity_id, visited); + return __uac_clock_find_source(chip, entity_id, visited); } static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface, @@ -211,11 +204,8 @@ static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface, 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)) { - snd_printk(KERN_WARNING "%d:%d:%d: endpoint lacks sample rate attribute bit, cannot set.\n", - dev->devnum, iface, fmt->altsetting); + if (!(fmt->attributes & UAC_EP_CS_ATTR_SAMPLE_RATE)) return 0; - } data[0] = rate; data[1] = rate >> 8; @@ -254,12 +244,13 @@ static int set_sample_rate_v2(struct snd_usb_audio *chip, int iface, struct usb_device *dev = chip->dev; unsigned char data[4]; int err, crate; - int clock = snd_usb_clock_find_source(chip, chip->ctrl_intf, fmt->clock); + 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; |