ASoC: tas5720: add basic support for TAS5722 devices

The TI TAS5722 digital amplifier is very similar to the TAS5720 from an
overall and register map perspective. Therefore the existing driver can be
extended easily to support this additional device. This commit allows
TAS5722 devices to be used in a "subset" type of fashion, without exposing
any of the additional features they offer.

Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/tas5720.txt b/Documentation/devicetree/bindings/sound/tas5720.txt
index 40d94f82beb364c1056e75d9f8e089368f63951a..7481653fe8e3eba498667dcebe9afb8d97dc3391 100644 (file)
--- a/Documentation/devicetree/bindings/sound/tas5720.txt
+++ b/Documentation/devicetree/bindings/sound/tas5720.txt
@@ -6,10 +6,12 @@ audio playback. For more product information please see the links below:
 
 http://www.ti.com/product/TAS5720L
 http://www.ti.com/product/TAS5720M
+http://www.ti.com/product/TAS5722L
 
 Required properties:
 
-- compatible : "ti,tas5720"
+- compatible : "ti,tas5720",
+               "ti,tas5722"
 - reg : I2C slave address
 - dvdd-supply : phandle to a 3.3-V supply for the digital circuitry
 - pvdd-supply : phandle to a supply used for the Class-D amp and the analog

diff --git a/sound/soc/codecs/tas5720.c b/sound/soc/codecs/tas5720.c
index a736a2a6976c2fb6eefd2994c413ea35159b3724..5def54d1336d9abb73dacbb74ba10ce829f806ef 100644 (file)
--- a/sound/soc/codecs/tas5720.c
+++ b/sound/soc/codecs/tas5720.c
@@ -36,6 +36,11 @@
 /* Define how often to check (and clear) the fault status register (in ms) */
 #define TAS5720_FAULT_CHECK_INTERVAL           200
 
+enum tas572x_type {
+       TAS5720,
+       TAS5722,
+};
+
 static const char * const tas5720_supply_names[] = {
        "dvdd",         /* Digital power supply. Connect to 3.3-V supply. */
        "pvdd",         /* Class-D amp and analog power supply (connected). */
@@ -47,6 +52,7 @@ struct tas5720_data {
        struct snd_soc_codec *codec;
        struct regmap *regmap;
        struct i2c_client *tas5720_client;
+       enum tas572x_type devtype;
        struct regulator_bulk_data supplies[TAS5720_NUM_SUPPLIES];
        struct delayed_work fault_check_work;
        unsigned int last_fault;
@@ -264,7 +270,7 @@ out:
 static int tas5720_codec_probe(struct snd_soc_codec *codec)
 {
        struct tas5720_data *tas5720 = snd_soc_codec_get_drvdata(codec);
-       unsigned int device_id;
+       unsigned int device_id, expected_device_id;
        int ret;
 
        tas5720->codec = codec;
@@ -276,6 +282,11 @@ static int tas5720_codec_probe(struct snd_soc_codec *codec)
                return ret;
        }
 
+       /*
+        * Take a liberal approach to checking the device ID to allow the
+        * driver to be used even if the device ID does not match, however
+        * issue a warning if there is a mismatch.
+        */
        ret = regmap_read(tas5720->regmap, TAS5720_DEVICE_ID_REG, &device_id);
        if (ret < 0) {
                dev_err(codec->dev, "failed to read device ID register: %d\n",
@@ -283,13 +294,22 @@ static int tas5720_codec_probe(struct snd_soc_codec *codec)
                goto probe_fail;
        }
 
-       if (device_id != TAS5720_DEVICE_ID) {
-               dev_err(codec->dev, "wrong device ID. expected: %u read: %u\n",
-                       TAS5720_DEVICE_ID, device_id);
-               ret = -ENODEV;
-               goto probe_fail;
+       switch (tas5720->devtype) {
+       case TAS5720:
+               expected_device_id = TAS5720_DEVICE_ID;
+               break;
+       case TAS5722:
+               expected_device_id = TAS5722_DEVICE_ID;
+               break;
+       default:
+               dev_err(codec->dev, "unexpected private driver data\n");
+               return -EINVAL;
        }
 
+       if (device_id != expected_device_id)
+               dev_warn(codec->dev, "wrong device ID. expected: %u read: %u\n",
+                        expected_device_id, device_id);
+
        /* Set device to mute */
        ret = snd_soc_update_bits(codec, TAS5720_DIGITAL_CTRL2_REG,
                                  TAS5720_MUTE, TAS5720_MUTE);
@@ -552,6 +572,8 @@ static int tas5720_probe(struct i2c_client *client,
                return -ENOMEM;
 
        data->tas5720_client = client;
+       data->devtype = id->driver_data;
+
        data->regmap = devm_regmap_init_i2c(client, &tas5720_regmap_config);
        if (IS_ERR(data->regmap)) {
                ret = PTR_ERR(data->regmap);
@@ -592,7 +614,8 @@ static int tas5720_remove(struct i2c_client *client)
 }
 
 static const struct i2c_device_id tas5720_id[] = {
-       { "tas5720", 0 },
+       { "tas5720", TAS5720 },
+       { "tas5722", TAS5722 },
        { }
 };
 MODULE_DEVICE_TABLE(i2c, tas5720_id);
@@ -600,6 +623,7 @@ MODULE_DEVICE_TABLE(i2c, tas5720_id);
 #if IS_ENABLED(CONFIG_OF)
 static const struct of_device_id tas5720_of_match[] = {
        { .compatible = "ti,tas5720", },
+       { .compatible = "ti,tas5722", },
        { },
 };
 MODULE_DEVICE_TABLE(of, tas5720_of_match);

diff --git a/sound/soc/codecs/tas5720.h b/sound/soc/codecs/tas5720.h
index 3d077c779b1260f5077541131f5bc03262810e81..bef802afcc69ec7aa00dd7d781d0ea0bbe34aed8 100644 (file)
--- a/sound/soc/codecs/tas5720.h
+++ b/sound/soc/codecs/tas5720.h
@@ -32,6 +32,7 @@
 
 /* TAS5720_DEVICE_ID_REG */
 #define TAS5720_DEVICE_ID              0x01
+#define TAS5722_DEVICE_ID              0x12
 
 /* TAS5720_POWER_CTRL_REG */
 #define TAS5720_DIG_CLIP_MASK          GENMASK(7, 2)