CHROMIUM: ASoC: Import entire upstream ASoC tree

sound/soc/codecs/cs4270.c

 /*
  * CS4270 ALSA SoC (ASoC) codec driver
  *
  * Author: Timur Tabi <timur@freescale.com>
  *
  * Copyright 2007-2009 Freescale Semiconductor, Inc.  This file is licensed
  * under the terms of the GNU General Public License version 2.  This
  * program is licensed "as is" without any warranty of any kind, whether
  * express or implied.
  *
@@ skipping 88 matching lines @@
 #define CS4270_TRANS_INV_DAC_A  0x02
 #define CS4270_TRANS_INV_DAC_B  0x04
 #define CS4270_TRANS_DEEMPH     0x01
 #define CS4270_MUTE_AUTO        0x20
 #define CS4270_MUTE_ADC_A       0x08
 #define CS4270_MUTE_ADC_B       0x10
 #define CS4270_MUTE_POLARITY    0x04
 #define CS4270_MUTE_DAC_A       0x01
 #define CS4270_MUTE_DAC_B       0x02
 
+/* Power-on default values for the registers
+ *
+ * This array contains the power-on default values of the registers, with the
+ * exception of the "CHIPID" register (01h).  The lower four bits of that
+ * register contain the hardware revision, so it is treated as volatile.
+ *
+ * Also note that on the CS4270, the first readable register is 1, but ASoC
+ * assumes the first register is 0.  Therfore, the array must have an entry for
+ * register 0, but we use cs4270_reg_is_readable() to tell ASoC that it can't
+ * be read.
+ */
+static const u8 cs4270_default_reg_cache[CS4270_LASTREG + 1] = {
+        0x00, 0x00, 0x00, 0x30, 0x00, 0x60, 0x20, 0x00, 0x00
+};
+
 static const char *supply_names[] = {
         "va", "vd", "vlc"
 };
 
 /* Private data for the CS4270 */
 struct cs4270_private {
         enum snd_soc_control_type control_type;
         void *control_data;
-        u8 reg_cache[CS4270_NUMREGS];
         unsigned int mclk; /* Input frequency of the MCLK pin */
         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)];
 };
 
 /**
@@ skipping 44 matching lines @@
         {256, CS4270_MODE_1X, CS4270_MODE_DIV1},
         {384, CS4270_MODE_2X, CS4270_MODE_DIV3},
         {512, CS4270_MODE_1X, CS4270_MODE_DIV2},
         {768, CS4270_MODE_1X, CS4270_MODE_DIV3},
         {1024, CS4270_MODE_1X, CS4270_MODE_DIV4}
 };
 
 /* The number of MCLK/LRCK ratios supported by the CS4270 */
 #define NUM_MCLK_RATIOS         ARRAY_SIZE(cs4270_mode_ratios)
 
+static int cs4270_reg_is_readable(struct snd_soc_codec *codec, unsigned int reg)
+{
+        return (reg >= CS4270_FIRSTREG) && (reg <= CS4270_LASTREG);
+}
+
+static int cs4270_reg_is_volatile(struct snd_soc_codec *codec, unsigned int reg)
+{
+        /* Unreadable registers are considered volatile */
+        if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG))
+                return 1;
+
+        return reg == CS4270_CHIPID;
+}
+
 /**
  * cs4270_set_dai_sysclk - determine the CS4270 samples rates.
  * @codec_dai: the codec DAI
  * @clk_id: the clock ID (ignored)
  * @freq: the MCLK input frequency
  * @dir: the clock direction (ignored)
  *
  * This function is used to tell the codec driver what the input MCLK
  * frequency is.
  *
@@ skipping 65 matching lines @@
                 break;
         default:
                 /* all other modes are unsupported by the hardware */
                 ret = -EINVAL;
         }
 
         return ret;
 }
 
 /**
- * cs4270_fill_cache - pre-fill the CS4270 register cache.
- * @codec: the codec for this CS4270
- *
- * This function fills in the CS4270 register cache by reading the register
- * values from the hardware.
- *
- * This CS4270 registers are cached to avoid excessive I2C I/O operations.
- * After the initial read to pre-fill the cache, the CS4270 never updates
- * the register values, so we won't have a cache coherency problem.
- *
- * We use the auto-increment feature of the CS4270 to read all registers in
- * one shot.
- */
-static int cs4270_fill_cache(struct snd_soc_codec *codec)
-{
-        u8 *cache = codec->reg_cache;
-        struct i2c_client *i2c_client = codec->control_data;
-        s32 length;
-
-        length = i2c_smbus_read_i2c_block_data(i2c_client,
-                CS4270_FIRSTREG | CS4270_I2C_INCR, CS4270_NUMREGS, cache);
-
-        if (length != CS4270_NUMREGS) {
-                dev_err(codec->dev, "i2c read failure, addr=0x%x\n",
-                       i2c_client->addr);
-                return -EIO;
-        }
-
-        return 0;
-}
-
-/**
- * cs4270_read_reg_cache - read from the CS4270 register cache.
- * @codec: the codec for this CS4270
- * @reg: the register to read
- *
- * This function returns the value for a given register.  It reads only from
- * the register cache, not the hardware itself.
- *
- * This CS4270 registers are cached to avoid excessive I2C I/O operations.
- * After the initial read to pre-fill the cache, the CS4270 never updates
- * the register values, so we won't have a cache coherency problem.
- */
-static unsigned int cs4270_read_reg_cache(struct snd_soc_codec *codec,
-        unsigned int reg)
-{
-        u8 *cache = codec->reg_cache;
-
-        if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG))
-                return -EIO;
-
-        return cache[reg - CS4270_FIRSTREG];
-}
-
-/**
- * cs4270_i2c_write - write to a CS4270 register via the I2C bus.
- * @codec: the codec for this CS4270
- * @reg: the register to write
- * @value: the value to write to the register
- *
- * This function writes the given value to the given CS4270 register, and
- * also updates the register cache.
- *
- * Note that we don't use the hw_write function pointer of snd_soc_codec.
- * That's because it's too clunky: the hw_write_t prototype does not match
- * i2c_smbus_write_byte_data(), and it's just another layer of overhead.
- */
-static int cs4270_i2c_write(struct snd_soc_codec *codec, unsigned int reg,
-                            unsigned int value)
-{
-        u8 *cache = codec->reg_cache;
-
-        if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG))
-                return -EIO;
-
-        /* Only perform an I2C operation if the new value is different */
-        if (cache[reg - CS4270_FIRSTREG] != value) {
-                struct i2c_client *client = codec->control_data;
-                if (i2c_smbus_write_byte_data(client, reg, value)) {
-                        dev_err(codec->dev, "i2c write failed\n");
-                        return -EIO;
-                }
-
-                /* We've written to the hardware, so update the cache */
-                cache[reg - CS4270_FIRSTREG] = value;
-        }
-
-        return 0;
-}
-
-/**
  * cs4270_hw_params - program the CS4270 with the given hardware parameters.
  * @substream: the audio stream
  * @params: the hardware parameters to set
  * @dai: the SOC DAI (ignored)
  *
  * This function programs the hardware with the values provided.
  * Specifically, the sample rate and the data format.
  *
  * The .ops functions are used to provide board-specific data, like input
  * frequencies, to this driver.  This function takes that information,
@@ skipping 176 matching lines @@
 /**
  * cs4270_probe - ASoC probe function
  * @pdev: platform device
  *
  * This function is called when ASoC has all the pieces it needs to
  * instantiate a sound driver.
  */
 static int cs4270_probe(struct snd_soc_codec *codec)
 {
         struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec);
-        int i, ret, reg;
+        int i, ret;
 
         codec->control_data = cs4270->control_data;
 
-        /* The I2C interface is set up, so pre-fill our register cache */
-
-        ret = cs4270_fill_cache(codec);
+        /* Tell ASoC what kind of I/O to use to read the registers.  ASoC will
+         * then do the I2C transactions itself.
+         */
+        ret = snd_soc_codec_set_cache_io(codec, 8, 8, cs4270->control_type);
         if (ret < 0) {
-                dev_err(codec->dev, "failed to fill register cache\n");
+                dev_err(codec->dev, "failed to set cache I/O (ret=%i)\n", ret);
                 return ret;
         }
 
         /* Disable auto-mute.  This feature appears to be buggy.  In some
          * situations, auto-mute will not deactivate when it should, so we want
          * this feature disabled by default.  An application (e.g. alsactl) can
          * re-enabled it by using the controls.
          */
-
-        reg = cs4270_read_reg_cache(codec, CS4270_MUTE);
-        reg &= ~CS4270_MUTE_AUTO;
-        ret = cs4270_i2c_write(codec, CS4270_MUTE, reg);
+        ret = snd_soc_update_bits(codec, CS4270_MUTE, CS4270_MUTE_AUTO, 0);
         if (ret < 0) {
                 dev_err(codec->dev, "i2c write failed\n");
                 return ret;
         }
 
         /* Disable automatic volume control.  The hardware enables, and it
          * causes volume change commands to be delayed, sometimes until after
          * playback has started.  An application (e.g. alsactl) can
          * re-enabled it by using the controls.
          */
-
-        reg = cs4270_read_reg_cache(codec, CS4270_TRANS);
-        reg &= ~(CS4270_TRANS_SOFT | CS4270_TRANS_ZERO);
-        ret = cs4270_i2c_write(codec, CS4270_TRANS, reg);
+        ret = snd_soc_update_bits(codec, CS4270_TRANS,
+                CS4270_TRANS_SOFT | CS4270_TRANS_ZERO, 0);
         if (ret < 0) {
                 dev_err(codec->dev, "i2c write failed\n");
                 return ret;
         }
 
         /* Add the non-DAPM controls */
         ret = snd_soc_add_controls(codec, cs4270_snd_controls,
                                 ARRAY_SIZE(cs4270_snd_controls));
         if (ret < 0) {
                 dev_err(codec->dev, "failed to add controls\n");
@@ skipping 102 matching lines @@
 #define cs4270_soc_suspend      NULL
 #define cs4270_soc_resume       NULL
 #endif /* CONFIG_PM */
 
 /*
  * ASoC codec device structure
  *
  * Assign this variable to the codec_dev field of the machine driver's
  * snd_soc_device structure.
  */
-static struct snd_soc_codec_driver soc_codec_device_cs4270 = {
-        .probe =        cs4270_probe,
-        .remove =       cs4270_remove,
-        .suspend =      cs4270_soc_suspend,
-        .resume =       cs4270_soc_resume,
-        .read = cs4270_read_reg_cache,
-        .write = cs4270_i2c_write,
-        .reg_cache_size = CS4270_NUMREGS,
-        .reg_word_size = sizeof(u8),
+static const struct snd_soc_codec_driver soc_codec_device_cs4270 = {
+        .probe =                cs4270_probe,
+        .remove =               cs4270_remove,
+        .suspend =              cs4270_soc_suspend,
+        .resume =               cs4270_soc_resume,
+        .volatile_register =    cs4270_reg_is_volatile,
+        .readable_register =    cs4270_reg_is_readable,
+        .reg_cache_size =       CS4270_LASTREG + 1,
+        .reg_word_size =        sizeof(u8),
+        .reg_cache_default =    cs4270_default_reg_cache,
 };
 
 /**
  * cs4270_i2c_probe - initialize the I2C interface of the CS4270
  * @i2c_client: the I2C client object
  * @id: the I2C device ID (ignored)
  *
  * This function is called whenever the I2C subsystem finds a device that
  * matches the device ID given via a prior call to i2c_add_driver().
  */
@@ skipping 87 matching lines @@
 
 static void __exit cs4270_exit(void)
 {
         i2c_del_driver(&cs4270_i2c_driver);
 }
 module_exit(cs4270_exit);
 
 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
 MODULE_DESCRIPTION("Cirrus Logic CS4270 ALSA SoC Codec Driver");
 MODULE_LICENSE("GPL");