Commit f66f898e authored by Peter Rosin's avatar Peter Rosin Committed by Mark Brown
Browse files

ALSA: pcm: Add snd_interval_ranges() and snd_pcm_hw_constraint_ranges() 



Add helper functions to allow drivers to specify several disjoint
ranges for a variable. In particular, there is a codec (PCM512x) that
has a hole in its supported range of rates, due to PLL and divider
restrictions.

This is like snd_pcm_hw_constraint_list(), but for ranges instead of
points.

Signed-off-by: default avatarPeter Rosin <peda@axentia.se>
Reviewed-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Reviewed-by: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent ba5295e5

include/sound/pcm.h

+12 −0
Original line number Diff line number Diff line
@@ -275,6 +275,12 @@ struct snd_pcm_hw_constraint_list { 
	unsigned int mask;

};



struct snd_pcm_hw_constraint_ranges {

	unsigned int count;

	const struct snd_interval *ranges;

	unsigned int mask;

};



struct snd_pcm_hwptr_log;



struct snd_pcm_runtime {
@@ -910,6 +916,8 @@ void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k, 
			  const struct snd_interval *b, struct snd_interval *c);

int snd_interval_list(struct snd_interval *i, unsigned int count,

		      const unsigned int *list, unsigned int mask);

int snd_interval_ranges(struct snd_interval *i, unsigned int count,

			const struct snd_interval *list, unsigned int mask);

int snd_interval_ratnum(struct snd_interval *i,

			unsigned int rats_count, struct snd_ratnum *rats,

			unsigned int *nump, unsigned int *denp);
@@ -934,6 +942,10 @@ int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 
			       unsigned int cond,

			       snd_pcm_hw_param_t var,

			       const struct snd_pcm_hw_constraint_list *l);

int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,

				 unsigned int cond,

				 snd_pcm_hw_param_t var,

				 const struct snd_pcm_hw_constraint_ranges *r);

int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 

				  unsigned int cond,

				  snd_pcm_hw_param_t var,

sound/core/pcm_lib.c

+85 −0
Original line number Diff line number Diff line
@@ -1015,6 +1015,60 @@ int snd_interval_list(struct snd_interval *i, unsigned int count, 


EXPORT_SYMBOL(snd_interval_list);



/**

 * snd_interval_ranges - refine the interval value from the list of ranges

 * @i: the interval value to refine

 * @count: the number of elements in the list of ranges

 * @ranges: the ranges list

 * @mask: the bit-mask to evaluate

 *

 * Refines the interval value from the list of ranges.

 * When mask is non-zero, only the elements corresponding to bit 1 are

 * evaluated.

 *

 * Return: Positive if the value is changed, zero if it's not changed, or a

 * negative error code.

 */

int snd_interval_ranges(struct snd_interval *i, unsigned int count,

			const struct snd_interval *ranges, unsigned int mask)

{

	unsigned int k;

	struct snd_interval range_union;

	struct snd_interval range;



	if (!count) {

		snd_interval_none(i);

		return -EINVAL;

	}

	snd_interval_any(&range_union);

	range_union.min = UINT_MAX;

	range_union.max = 0;

	for (k = 0; k < count; k++) {

		if (mask && !(mask & (1 << k)))

			continue;

		snd_interval_copy(&range, &ranges[k]);

		if (snd_interval_refine(&range, i) < 0)

			continue;

		if (snd_interval_empty(&range))

			continue;



		if (range.min < range_union.min) {

			range_union.min = range.min;

			range_union.openmin = 1;

		}

		if (range.min == range_union.min && !range.openmin)

			range_union.openmin = 0;

		if (range.max > range_union.max) {

			range_union.max = range.max;

			range_union.openmax = 1;

		}

		if (range.max == range_union.max && !range.openmax)

			range_union.openmax = 0;

	}

	return snd_interval_refine(i, &range_union);

}

EXPORT_SYMBOL(snd_interval_ranges);



static int snd_interval_step(struct snd_interval *i, unsigned int step)

{

	unsigned int n;
@@ -1221,6 +1275,37 @@ int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 


EXPORT_SYMBOL(snd_pcm_hw_constraint_list);



static int snd_pcm_hw_rule_ranges(struct snd_pcm_hw_params *params,

				  struct snd_pcm_hw_rule *rule)

{

	struct snd_pcm_hw_constraint_ranges *r = rule->private;

	return snd_interval_ranges(hw_param_interval(params, rule->var),

				   r->count, r->ranges, r->mask);

}





/**

 * snd_pcm_hw_constraint_ranges - apply list of range constraints to a parameter

 * @runtime: PCM runtime instance

 * @cond: condition bits

 * @var: hw_params variable to apply the list of range constraints

 * @r: ranges

 *

 * Apply the list of range constraints to an interval parameter.

 *

 * Return: Zero if successful, or a negative error code on failure.

 */

int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,

				 unsigned int cond,

				 snd_pcm_hw_param_t var,

				 const struct snd_pcm_hw_constraint_ranges *r)

{

	return snd_pcm_hw_rule_add(runtime, cond, var,

				   snd_pcm_hw_rule_ranges, (void *)r,

				   var, -1);

}

EXPORT_SYMBOL(snd_pcm_hw_constraint_ranges);



static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,

				   struct snd_pcm_hw_rule *rule)

{

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