kernel/linux.git/include/sound/pcm.h, branch v4.9.331

ALSA: pcm: remove SNDRV_PCM_IOCTL1_INFO internal command

2019-05-16T17:43:44+00:00

commit e11f0f90a626f93899687b1cc909ee37dd6c5809 upstream. Drivers can implement 'struct snd_pcm_ops.ioctl' to handle some requests from ALSA PCM core. These requests are internal purpose in kernel land. Usually common set of operations are used for it. SNDRV_PCM_IOCTL1_INFO is one of the requests. According to code comment, it has been obsoleted in the old days. We can see old releases in ftp.alsa-project.org. The command was firstly introduced in v0.5.0 release as SND_PCM_IOCTL1_INFO, to allow drivers to fill data of 'struct snd_pcm_channel_info' type. In v0.9.0 release, this was obsoleted by the other commands for ioctl(2) such as SNDRV_PCM_IOCTL_CHANNEL_INFO. This commit removes the long-abandoned command, bye. Signed-off-by: Takashi Sakamoto Signed-off-by: Takashi Iwai Signed-off-by: Nobuhiro Iwamatsu Signed-off-by: Greg Kroah-Hartman

ALSA: pcm: Add snd_pcm_rate_range_to_bits()

2016-02-05T18:49:00+00:00

This helper function can convert a given sample rate range to SNDRV_PCM_RATE_xxx bits. Signed-off-by: Mengdong Lin Acked-by: Takashi Iwai Acked-by: Liam Girdwood Signed-off-by: Mark Brown

ALSA: Constify ratden/ratnum constraints

2015-10-28T10:42:22+00:00

The ALSA core does not modify the constraints provided by a driver. Most constraint helper functions already take a const pointer to the constraint description, the exception at the moment being the ratden and ratnum constraints. Make those const as well, this allows a driver to declare them as const. Signed-off-by: Lars-Peter Clausen Signed-off-by: Takashi Iwai

Merge branch 'topic/hw-constraint-single' into for-next

2015-10-23T04:57:50+00:00

ALSA: Remove transfer_ack_{begin,end} callbacks from struct snd_pcm_runtime

2015-10-22T15:16:23+00:00

While there is nothing wrong with the transfer_ack_begin and transfer_ack_end callbacks per-se, the last documented user was part of the alsa-driver 0.5.12a package, which was released 14 years ago and even predates the upstream integration of the ALSA core and has subsequently been superseded by newer alsa-driver releases. This seems to indicate that there is no need for having these callbacks and they are just cruft that can be removed. Signed-off-by: Lars-Peter Clausen Signed-off-by: Takashi Iwai

ALSA: Add helper function to add single value constraint

2015-10-21T12:24:14+00:00

The recommended and most efficient way to constraint a configuration parameter to a single value is to set the minimum and maximum allowed values to the same value, i.e. calling snd_pcm_hw_constraint_minmax() with the same value for min and max. It is not necessarily obvious though that this is the approach that should be taken and some drivers have come up with other ways of solving this problem, e.g. installing a list constraint with a single item. List constraints are dynamic constraints though and hence less efficient than the static min-max constraint. This patch introduces a new helper function called snd_pcm_hw_constraint_single() which only takes a single value has the same effect as calling snd_pcm_hw_constraint_minmax() with the same values for min and max. But it is hopefully semantically more expressive, making it clear that this is the preferred way of setting a single value constraint. Signed-off-by: Lars-Peter Clausen Acked-by: Mark Brown Signed-off-by: Takashi Iwai

ALSA: timer: add config item to export PCM timer disabling for expert

2015-10-16T12:31:38+00:00

PCM timer is not always used. For embedded device, we need an interface to disable it when it is not needed, to shrink the kernel size and memory footprint, here add CONFIG_SND_PCM_TIMER for it. When both CONFIG_SND_PCM_TIMER and CONFIG_SND_TIMER is unselected, about 25KB saving bonus we can get. Please be noted that when disabled, those stubs who using pcm timer (e.g. dmix, dsnoop & co) may work incorrectlly. Suggested-by: Takashi Iwai Signed-off-by: Jie Yang Signed-off-by: Takashi Iwai

ALSA: pcm: remove structure member of 'struct snd_pcm_hwptr_log *' type because this structure had been removed

2015-09-13T10:03:15+00:00

This structure was added by 4d96eb255c53 ('ALSA: pcm_lib - add possibility to log last 10 DMA ring buffer positions') to store PCM pointers information of latest 10 pointer movements (=XRUN_LOG_CNT). When CONFIG_SND_PCM_XRUN_DEBUG is configured, 'struct snd_pcm_runtime' has 'hwptr_log' member with a pointer to the structure. When calling xrun_log() in pcm_lib.c, the structure was allocated to the pointer. When calling snd_pcm_detach_substream() in pcm.c, the allocated pointer is released. In f5914908a5b7 ('ALSA: pcm: Replace PCM hwptr tracking with tracepoints'), the pointer logging is replaced with using Linux Kernel Tracepoints. The structure was also removed, while it's just declared. The member and kfree still remains. This commit removes the member and related codes. I think this was overlooked because it brings no errors/warnings to C compilers. Fixes: f5914908a5b7 ('ALSA: pcm: Replace PCM hwptr tracking with tracepoints') Signed-off-by: Takashi Sakamoto Signed-off-by: Takashi Iwai

ALSA: Close holes in struct snd_pcm_constraint_list

2015-04-27T10:24:49+00:00

On a 64-bit system there is a 32-bit hole in struct snd_pcm_constraint_list and then 32-bit padding at the end. Reordering things slightly gets rid of the hole and padding, reducing the size of the struct by 50% from its original size. Signed-off-by: Lars-Peter Clausen Signed-off-by: Takashi Iwai

ALSA: Close holes in struct snd_pcm_hw_rule

2015-04-27T10:24:34+00:00

On a 64-bit system there are two 32-bit holes due to the alignment of 64-bit fields. Reordering things slightly gets rid of those holes, reducing the size of the struct by 17% percent of its original size. Signed-off-by: Lars-Peter Clausen Signed-off-by: Takashi Iwai