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authorRussell King <rmk+kernel@arm.linux.org.uk>2015-05-09 13:26:42 +0300
committerTakashi Iwai <tiwai@suse.de>2015-05-22 17:01:44 +0300
commit838d1631b766529213684f07dd71cdf2e92f0623 (patch)
tree95fce5b51dfb9eae52cd071f468812cca7f8fe56 /sound/core/pcm_drm_eld.c
parentb787f68c36d49bb1d9236f403813641efa74a031 (diff)
downloadlinux-838d1631b766529213684f07dd71cdf2e92f0623.tar.xz
ALSA: pcm: add DRM ELD helper
Add a helper for the EDID like data structure, which is typically passed from a HDMI adapter to its associated audio driver. This informs the audio driver of the capabilities of the attached HDMI sink. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Reviewed-by: Mark Brown <broonie@kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core/pcm_drm_eld.c')
-rw-r--r--sound/core/pcm_drm_eld.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/sound/core/pcm_drm_eld.c b/sound/core/pcm_drm_eld.c
new file mode 100644
index 000000000000..e70379fb63d0
--- /dev/null
+++ b/sound/core/pcm_drm_eld.c
@@ -0,0 +1,99 @@
+/*
+ * PCM DRM helpers
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/export.h>
+#include <drm/drm_edid.h>
+#include <sound/pcm.h>
+#include <sound/pcm_drm_eld.h>
+
+static const unsigned int eld_rates[] = {
+ 32000,
+ 44100,
+ 48000,
+ 88200,
+ 96000,
+ 176400,
+ 192000,
+};
+
+static unsigned int sad_max_channels(const u8 *sad)
+{
+ return 1 + (sad[0] & 7);
+}
+
+static int eld_limit_rates(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_interval *r = hw_param_interval(params, rule->var);
+ struct snd_interval *c;
+ unsigned int rate_mask = 7, i;
+ const u8 *sad, *eld = rule->private;
+
+ sad = drm_eld_sad(eld);
+ if (sad) {
+ c = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+
+ for (i = drm_eld_sad_count(eld); i > 0; i--, sad += 3) {
+ unsigned max_channels = sad_max_channels(sad);
+
+ /*
+ * Exclude SADs which do not include the
+ * requested number of channels.
+ */
+ if (c->min <= max_channels)
+ rate_mask |= sad[1];
+ }
+ }
+
+ return snd_interval_list(r, ARRAY_SIZE(eld_rates), eld_rates,
+ rate_mask);
+}
+
+static int eld_limit_channels(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_interval *c = hw_param_interval(params, rule->var);
+ struct snd_interval *r;
+ struct snd_interval t = { .min = 1, .max = 2, .integer = 1, };
+ unsigned int i;
+ const u8 *sad, *eld = rule->private;
+
+ sad = drm_eld_sad(eld);
+ if (sad) {
+ unsigned int rate_mask = 0;
+
+ /* Convert the rate interval to a mask */
+ r = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
+ for (i = 0; i < ARRAY_SIZE(eld_rates); i++)
+ if (r->min <= eld_rates[i] && r->max >= eld_rates[i])
+ rate_mask |= BIT(i);
+
+ for (i = drm_eld_sad_count(eld); i > 0; i--, sad += 3)
+ if (rate_mask & sad[1])
+ t.max = max(t.max, sad_max_channels(sad));
+ }
+
+ return snd_interval_refine(c, &t);
+}
+
+int snd_pcm_hw_constraint_eld(struct snd_pcm_runtime *runtime, void *eld)
+{
+ int ret;
+
+ ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+ eld_limit_rates, eld,
+ SNDRV_PCM_HW_PARAM_CHANNELS, -1);
+ if (ret < 0)
+ return ret;
+
+ ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
+ eld_limit_channels, eld,
+ SNDRV_PCM_HW_PARAM_RATE, -1);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(snd_pcm_hw_constraint_eld);