diff options
Diffstat (limited to 'sound/soc/codecs/cs4270.c')
| -rw-r--r-- | sound/soc/codecs/cs4270.c | 156 |
1 files changed, 86 insertions, 70 deletions
diff --git a/sound/soc/codecs/cs4270.c b/sound/soc/codecs/cs4270.c index 047917f0b8ae..8e4779812b96 100644 --- a/sound/soc/codecs/cs4270.c +++ b/sound/soc/codecs/cs4270.c @@ -29,6 +29,8 @@ #include <linux/i2c.h> #include <linux/delay.h> #include <linux/regulator/consumer.h> +#include <linux/of_device.h> +#include <linux/of_gpio.h> /* * The codec isn't really big-endian or little-endian, since the I2S @@ -110,14 +112,15 @@ * 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 struct reg_default cs4270_reg_defaults[] = { + { 2, 0x00 }, + { 3, 0x30 }, + { 4, 0x00 }, + { 5, 0x60 }, + { 6, 0x20 }, + { 7, 0x00 }, + { 8, 0x00 }, }; static const char *supply_names[] = { @@ -126,7 +129,7 @@ static const char *supply_names[] = { /* Private data for the CS4270 */ struct cs4270_private { - enum snd_soc_control_type control_type; + struct regmap *regmap; unsigned int mclk; /* Input frequency of the MCLK pin */ unsigned int mode; /* The mode (I2S or left-justified) */ unsigned int slave_mode; @@ -191,12 +194,12 @@ static struct cs4270_mode_ratios cs4270_mode_ratios[] = { /* 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) +static bool cs4270_reg_is_readable(struct device *dev, unsigned int reg) { return (reg >= CS4270_FIRSTREG) && (reg <= CS4270_LASTREG); } -static int cs4270_reg_is_volatile(struct snd_soc_codec *codec, unsigned int reg) +static bool cs4270_reg_is_volatile(struct device *dev, unsigned int reg) { /* Unreadable registers are considered volatile */ if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG)) @@ -456,7 +459,7 @@ static struct snd_soc_dai_driver cs4270_dai = { .name = "cs4270-hifi", .playback = { .stream_name = "Playback", - .channels_min = 1, + .channels_min = 2, .channels_max = 2, .rates = SNDRV_PCM_RATE_CONTINUOUS, .rate_min = 4000, @@ -465,7 +468,7 @@ static struct snd_soc_dai_driver cs4270_dai = { }, .capture = { .stream_name = "Capture", - .channels_min = 1, + .channels_min = 2, .channels_max = 2, .rates = SNDRV_PCM_RATE_CONTINUOUS, .rate_min = 4000, @@ -485,12 +488,12 @@ static struct snd_soc_dai_driver cs4270_dai = { static int cs4270_probe(struct snd_soc_codec *codec) { struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec); - int i, ret; + int ret; /* 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); + ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_REGMAP); if (ret < 0) { dev_err(codec->dev, "failed to set cache I/O (ret=%i)\n", ret); return ret; @@ -519,33 +522,8 @@ static int cs4270_probe(struct snd_soc_codec *codec) return ret; } - /* Add the non-DAPM controls */ - ret = snd_soc_add_codec_controls(codec, cs4270_snd_controls, - ARRAY_SIZE(cs4270_snd_controls)); - if (ret < 0) { - dev_err(codec->dev, "failed to add controls\n"); - return ret; - } - - /* 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) - return ret; - 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); return ret; } @@ -561,7 +539,6 @@ static int cs4270_remove(struct snd_soc_codec *codec) struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec); regulator_bulk_disable(ARRAY_SIZE(cs4270->supplies), cs4270->supplies); - regulator_bulk_free(ARRAY_SIZE(cs4270->supplies), cs4270->supplies); return 0; }; @@ -611,7 +588,7 @@ static int cs4270_soc_resume(struct snd_soc_codec *codec) ndelay(500); /* first restore the entire register cache ... */ - snd_soc_cache_sync(codec); + regcache_sync(cs4270->regmap); /* ... then disable the power-down bits */ reg = snd_soc_read(codec, CS4270_PWRCTL); @@ -632,11 +609,30 @@ static const struct snd_soc_codec_driver soc_codec_device_cs4270 = { .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, + + .controls = cs4270_snd_controls, + .num_controls = ARRAY_SIZE(cs4270_snd_controls), +}; + +/* + * cs4270_of_match - the device tree bindings + */ +static const struct of_device_id cs4270_of_match[] = { + { .compatible = "cirrus,cs4270", }, + { } +}; +MODULE_DEVICE_TABLE(of, cs4270_of_match); + +static const struct regmap_config cs4270_regmap = { + .reg_bits = 8, + .val_bits = 8, + .max_register = CS4270_LASTREG, + .reg_defaults = cs4270_reg_defaults, + .num_reg_defaults = ARRAY_SIZE(cs4270_reg_defaults), + .cache_type = REGCACHE_RBTREE, + + .readable_reg = cs4270_reg_is_readable, + .volatile_reg = cs4270_reg_is_volatile, }; /** @@ -650,19 +646,56 @@ static const struct snd_soc_codec_driver soc_codec_device_cs4270 = { static int cs4270_i2c_probe(struct i2c_client *i2c_client, const struct i2c_device_id *id) { + struct device_node *np = i2c_client->dev.of_node; struct cs4270_private *cs4270; - int ret; + unsigned int val; + int ret, i; - /* Verify that we have a CS4270 */ + cs4270 = devm_kzalloc(&i2c_client->dev, sizeof(struct cs4270_private), + GFP_KERNEL); + if (!cs4270) { + dev_err(&i2c_client->dev, "could not allocate codec\n"); + return -ENOMEM; + } + + /* get the power supply regulators */ + for (i = 0; i < ARRAY_SIZE(supply_names); i++) + cs4270->supplies[i].supply = supply_names[i]; + + ret = devm_regulator_bulk_get(&i2c_client->dev, + ARRAY_SIZE(cs4270->supplies), + cs4270->supplies); + if (ret < 0) + return ret; + + /* See if we have a way to bring the codec out of reset */ + if (np) { + enum of_gpio_flags flags; + int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags); + + if (gpio_is_valid(gpio)) { + ret = devm_gpio_request_one(&i2c_client->dev, gpio, + flags & OF_GPIO_ACTIVE_LOW ? + GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH, + "cs4270 reset"); + if (ret < 0) + return ret; + } + } + + cs4270->regmap = devm_regmap_init_i2c(i2c_client, &cs4270_regmap); + if (IS_ERR(cs4270->regmap)) + return PTR_ERR(cs4270->regmap); - ret = i2c_smbus_read_byte_data(i2c_client, CS4270_CHIPID); + /* Verify that we have a CS4270 */ + ret = regmap_read(cs4270->regmap, CS4270_CHIPID, &val); if (ret < 0) { dev_err(&i2c_client->dev, "failed to read i2c at addr %X\n", i2c_client->addr); return ret; } /* The top four bits of the chip ID should be 1100. */ - if ((ret & 0xF0) != 0xC0) { + if ((val & 0xF0) != 0xC0) { dev_err(&i2c_client->dev, "device at addr %X is not a CS4270\n", i2c_client->addr); return -ENODEV; @@ -670,17 +703,9 @@ static int cs4270_i2c_probe(struct i2c_client *i2c_client, dev_info(&i2c_client->dev, "found device at i2c address %X\n", i2c_client->addr); - dev_info(&i2c_client->dev, "hardware revision %X\n", ret & 0xF); - - cs4270 = devm_kzalloc(&i2c_client->dev, sizeof(struct cs4270_private), - GFP_KERNEL); - if (!cs4270) { - dev_err(&i2c_client->dev, "could not allocate codec\n"); - return -ENOMEM; - } + dev_info(&i2c_client->dev, "hardware revision %X\n", val & 0xF); i2c_set_clientdata(i2c_client, cs4270); - cs4270->control_type = SND_SOC_I2C; ret = snd_soc_register_codec(&i2c_client->dev, &soc_codec_device_cs4270, &cs4270_dai, 1); @@ -718,23 +743,14 @@ static struct i2c_driver cs4270_i2c_driver = { .driver = { .name = "cs4270", .owner = THIS_MODULE, + .of_match_table = cs4270_of_match, }, .id_table = cs4270_id, .probe = cs4270_i2c_probe, .remove = cs4270_i2c_remove, }; -static int __init cs4270_init(void) -{ - return i2c_add_driver(&cs4270_i2c_driver); -} -module_init(cs4270_init); - -static void __exit cs4270_exit(void) -{ - i2c_del_driver(&cs4270_i2c_driver); -} -module_exit(cs4270_exit); +module_i2c_driver(cs4270_i2c_driver); MODULE_AUTHOR("Timur Tabi <timur@freescale.com>"); MODULE_DESCRIPTION("Cirrus Logic CS4270 ALSA SoC Codec Driver"); |