1 files changed, 75 insertions, 16 deletions

diff --git a/sound/soc/codecs/cs4270.c b/sound/soc/codecs/cs4270.c
index ffe122d1cd76..dfbeb2db61b3 100644
--- a/sound/soc/codecs/cs4270.c
+++ b/sound/soc/codecs/cs4270.c
@@ -28,6 +28,7 @@
 #include <sound/initval.h>
 #include <linux/i2c.h>
 #include <linux/delay.h>
+#include <linux/regulator/consumer.h>
 
 #include "cs4270.h"
 
@@ -106,6 +107,10 @@
 #define CS4270_MUTE_DAC_A       0x01
 #define CS4270_MUTE_DAC_B       0x02
 
+static const char *supply_names[] = {
+        "va", "vd", "vlc"
+};
+
 /* Private data for the CS4270 */
 struct cs4270_private {
         struct snd_soc_codec codec;
@@ -114,6 +119,9 @@ struct cs4270_private {
         unsigned int mode; /* The mode (I2S or left-justified) */
         unsigned int slave_mode;
         unsigned int manual_mute;
+
+        /* power domain regulators */
+        struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
 };
 
 /**
@@ -192,6 +200,11 @@ static struct cs4270_mode_ratios cs4270_mode_ratios[] = {
  * This function must be called by the machine driver's 'startup' function,
  * otherwise the list of supported sample rates will not be available in
  * time for ALSA.
+ *
+ * For setups with variable MCLKs, pass 0 as 'freq' argument. This will cause
+ * theoretically possible sample rates to be enabled. Call it again with a
+ * proper value set one the external clock is set (most probably you would do
+ * that from a machine's driver 'hw_param' hook.
  */
 static int cs4270_set_dai_sysclk(struct snd_soc_dai *codec_dai,
                                  int clk_id, unsigned int freq, int dir)
@@ -205,20 +218,27 @@ static int cs4270_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 
         cs4270->mclk = freq;
 
-        for (i = 0; i < NUM_MCLK_RATIOS; i++) {
-                unsigned int rate = freq / cs4270_mode_ratios[i].ratio;
-                rates |= snd_pcm_rate_to_rate_bit(rate);
-                if (rate < rate_min)
-                        rate_min = rate;
-                if (rate > rate_max)
-                        rate_max = rate;
-        }
-        /* FIXME: soc should support a rate list */
-        rates &= ~SNDRV_PCM_RATE_KNOT;
+        if (cs4270->mclk) {
+                for (i = 0; i < NUM_MCLK_RATIOS; i++) {
+                        unsigned int rate = freq / cs4270_mode_ratios[i].ratio;
+                        rates |= snd_pcm_rate_to_rate_bit(rate);
+                        if (rate < rate_min)
+                                rate_min = rate;
+                        if (rate > rate_max)
+                                rate_max = rate;
+                }
+                /* FIXME: soc should support a rate list */
+                rates &= ~SNDRV_PCM_RATE_KNOT;
 
-        if (!rates) {
-                dev_err(codec->dev, "could not find a valid sample rate\n");
-                return -EINVAL;
+                if (!rates) {
+                        dev_err(codec->dev, "could not find a valid sample rate\n");
+                        return -EINVAL;
+                }
+        } else {
+                /* enable all possible rates */
+                rates = SNDRV_PCM_RATE_8000_192000;
+                rate_min = 8000;
+                rate_max = 192000;
         }
 
         codec_dai->playback.rates = rates;
@@ -579,7 +599,8 @@ static int cs4270_probe(struct platform_device *pdev)
 {
         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
         struct snd_soc_codec *codec = cs4270_codec;
-        int ret;
+        struct cs4270_private *cs4270 = codec->private_data;
+        int i, ret;
 
         /* Connect the codec to the socdev.  snd_soc_new_pcms() needs this. */
         socdev->card->codec = codec;
@@ -599,8 +620,26 @@ static int cs4270_probe(struct platform_device *pdev)
                 goto error_free_pcms;
         }
 
+        /* get the power supply regulators */
+        for (i = 0; i < ARRAY_SIZE(supply_names); i++)
+                cs4270->supplies[i].supply = supply_names[i];
+
+        ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(cs4270->supplies),
+                                 cs4270->supplies);
+        if (ret < 0)
+                goto error_free_pcms;
+
+        ret = regulator_bulk_enable(ARRAY_SIZE(cs4270->supplies),
+                                    cs4270->supplies);
+        if (ret < 0)
+                goto error_free_regulators;
+
         return 0;
 
+error_free_regulators:
+        regulator_bulk_free(ARRAY_SIZE(cs4270->supplies),
+                            cs4270->supplies);
+
 error_free_pcms:
         snd_soc_free_pcms(socdev);
 
@@ -616,8 +655,12 @@ error_free_pcms:
 static int cs4270_remove(struct platform_device *pdev)
 {
         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+        struct snd_soc_codec *codec = cs4270_codec;
+        struct cs4270_private *cs4270 = codec->private_data;
 
         snd_soc_free_pcms(socdev);
+        regulator_bulk_disable(ARRAY_SIZE(cs4270->supplies), cs4270->supplies);
+        regulator_bulk_free(ARRAY_SIZE(cs4270->supplies), cs4270->supplies);
 
         return 0;
 };
@@ -799,17 +842,33 @@ MODULE_DEVICE_TABLE(i2c, cs4270_id);
 static int cs4270_soc_suspend(struct platform_device *pdev, pm_message_t mesg)
 {
         struct snd_soc_codec *codec = cs4270_codec;
-        int reg = snd_soc_read(codec, CS4270_PWRCTL) | CS4270_PWRCTL_PDN_ALL;
+        struct cs4270_private *cs4270 = codec->private_data;
+        int reg, ret;
 
-        return snd_soc_write(codec, CS4270_PWRCTL, reg);
+        reg = snd_soc_read(codec, CS4270_PWRCTL) | CS4270_PWRCTL_PDN_ALL;
+        if (reg < 0)
+                return reg;
+
+        ret = snd_soc_write(codec, CS4270_PWRCTL, reg);
+        if (ret < 0)
+                return ret;
+
+        regulator_bulk_disable(ARRAY_SIZE(cs4270->supplies),
+                               cs4270->supplies);
+
+        return 0;
 }
 
 static int cs4270_soc_resume(struct platform_device *pdev)
 {
         struct snd_soc_codec *codec = cs4270_codec;
+        struct cs4270_private *cs4270 = codec->private_data;
         struct i2c_client *i2c_client = codec->control_data;
         int reg;
 
+        regulator_bulk_enable(ARRAY_SIZE(cs4270->supplies),
+                              cs4270->supplies);
+
         /* In case the device was put to hard reset during sleep, we need to
          * wait 500ns here before any I2C communication. */
         ndelay(500);