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Date: Wed, 14 Jan 2015 12:52:44 +0100
From: Peter Rosin <peda@...ator.liu.se>
To: alsa-devel@...a-project.org
Cc: Peter Rosin <peda@...ntia.se>, Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.de>, Mark Brown <broonie@...aro.org>,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/7] ALSA: pcm: Add snd_interval_ranges() and snd_pcm_hw_constraint_ranges()
From: Peter Rosin <peda@...ntia.se>
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.
Signed-off-by: Peter Rosin <peda@...ntia.se>
---
include/sound/pcm.h | 12 +++++++
sound/core/pcm_lib.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 97 insertions(+)
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index b429b73e875e..95d1c20fa659 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -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,
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index ec9e7866177f..446c00bd908b 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -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)
{
--
1.7.10.4
--
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