2 files changed, 296 insertions, 41 deletions

diff --git a/Documentation/devicetree/bindings/sound/adi,adau1701.txt b/Documentation/devicetree/bindings/sound/adi,adau1701.txt
new file mode 100644
index 000000000000..547a49b56a62
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/adi,adau1701.txt
@@ -0,0 +1,35 @@
+Analog Devices ADAU1701
+
+Required properties:
+
+ - compatible:          Should contain "adi,adau1701"
+ - reg:                 The i2c address. Value depends on the state of ADDR0
+                        and ADDR1, as wired in hardware.
+
+Optional properties:
+
+ - reset-gpio:          A GPIO spec to define which pin is connected to the
+                        chip's !RESET pin. If specified, the driver will
+                        assert a hardware reset at probe time.
+ - adi,pll-mode-gpios:  An array of two GPIO specs to describe the GPIOs
+                        the ADAU's PLL config pins are connected to.
+                        The state of the pins are set according to the
+                        configured clock divider on ASoC side before the
+                        firmware is loaded.
+ - adi,pin-config:      An array of 12 numerical values selecting one of the
+                        pin configurations as described in the datasheet,
+                        table 53. Note that the value of this property has
+                        to be prefixed with '/bits/ 8'.
+
+Examples:
+
+        i2c_bus {
+                adau1701@34 {
+                        compatible = "adi,adau1701";
+                        reg = <0x34>;
+                        reset-gpio = <&gpio 23 0>;
+                        adi,pll-mode-gpios = <&gpio 24 0 &gpio 25 0>;
+                        adi,pin-config = /bits/ 8 <0x4 0x7 0x5 0x5 0x4 0x4
+                                                   0x4 0x4 0x4 0x4 0x4 0x4>;
+                };
+        };
diff --git a/sound/soc/codecs/adau1701.c b/sound/soc/codecs/adau1701.c
index dafdbe87edeb..0e250f118c0e 100644
--- a/sound/soc/codecs/adau1701.c
+++ b/sound/soc/codecs/adau1701.c
@@ -13,6 +13,10 @@
 #include <linux/i2c.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
@@ -21,16 +25,19 @@
 #include "sigmadsp.h"
 #include "adau1701.h"
 
-#define ADAU1701_DSPCTRL        0x1c
-#define ADAU1701_SEROCTL        0x1e
-#define ADAU1701_SERICTL        0x1f
+#define ADAU1701_DSPCTRL        0x081c
+#define ADAU1701_SEROCTL        0x081e
+#define ADAU1701_SERICTL        0x081f
 
-#define ADAU1701_AUXNPOW        0x22
+#define ADAU1701_AUXNPOW        0x0822
+#define ADAU1701_PINCONF_0      0x0820
+#define ADAU1701_PINCONF_1      0x0821
+#define ADAU1701_AUXNPOW        0x0822
 
-#define ADAU1701_OSCIPOW        0x26
-#define ADAU1701_DACSET         0x27
+#define ADAU1701_OSCIPOW        0x0826
+#define ADAU1701_DACSET         0x0827
 
-#define ADAU1701_NUM_REGS       0x28
+#define ADAU1701_MAX_REGISTER   0x0828
 
 #define ADAU1701_DSPCTRL_CR             (1 << 2)
 #define ADAU1701_DSPCTRL_DAM            (1 << 3)
@@ -84,10 +91,18 @@
 #define ADAU1701_OSCIPOW_OPD            0x04
 #define ADAU1701_DACSET_DACINIT         1
 
+#define ADAU1707_CLKDIV_UNSET           (-1UL)
+
 #define ADAU1701_FIRMWARE "adau1701.bin"
 
 struct adau1701 {
+        int gpio_nreset;
+        int gpio_pll_mode[2];
         unsigned int dai_fmt;
+        unsigned int pll_clkdiv;
+        unsigned int sysclk;
+        struct regmap *regmap;
+        u8 pin_config[12];
 };
 
 static const struct snd_kcontrol_new adau1701_controls[] = {
@@ -119,10 +134,13 @@ static const struct snd_soc_dapm_route adau1701_dapm_routes[] = {
         { "ADC", NULL, "IN1" },
 };
 
-static unsigned int adau1701_register_size(struct snd_soc_codec *codec,
+static unsigned int adau1701_register_size(struct device *dev,
                 unsigned int reg)
 {
         switch (reg) {
+        case ADAU1701_PINCONF_0:
+        case ADAU1701_PINCONF_1:
+                return 3;
         case ADAU1701_DSPCTRL:
         case ADAU1701_SEROCTL:
         case ADAU1701_AUXNPOW:
@@ -133,33 +151,42 @@ static unsigned int adau1701_register_size(struct snd_soc_codec *codec,
                 return 1;
         }
 
-        dev_err(codec->dev, "Unsupported register address: %d\n", reg);
+        dev_err(dev, "Unsupported register address: %d\n", reg);
         return 0;
 }
 
-static int adau1701_write(struct snd_soc_codec *codec, unsigned int reg,
-                unsigned int value)
+static bool adau1701_volatile_reg(struct device *dev, unsigned int reg)
 {
+        switch (reg) {
+        case ADAU1701_DACSET:
+                return true;
+        default:
+                return false;
+        }
+}
+
+static int adau1701_reg_write(void *context, unsigned int reg,
+                              unsigned int value)
+{
+        struct i2c_client *client = context;
         unsigned int i;
         unsigned int size;
-        uint8_t buf[4];
+        uint8_t buf[5];
         int ret;
 
-        size = adau1701_register_size(codec, reg);
+        size = adau1701_register_size(&client->dev, reg);
         if (size == 0)
                 return -EINVAL;
 
-        snd_soc_cache_write(codec, reg, value);
-
-        buf[0] = 0x08;
-        buf[1] = reg;
+        buf[0] = reg >> 8;
+        buf[1] = reg & 0xff;
 
         for (i = size + 1; i >= 2; --i) {
                 buf[i] = value;
                 value >>= 8;
         }
 
-        ret = i2c_master_send(to_i2c_client(codec->dev), buf, size + 2);
+        ret = i2c_master_send(client, buf, size + 2);
         if (ret == size + 2)
                 return 0;
         else if (ret < 0)
@@ -168,21 +195,107 @@ static int adau1701_write(struct snd_soc_codec *codec, unsigned int reg,
                 return -EIO;
 }
 
-static unsigned int adau1701_read(struct snd_soc_codec *codec, unsigned int reg)
+static int adau1701_reg_read(void *context, unsigned int reg,
+                             unsigned int *value)
 {
-        unsigned int value;
-        unsigned int ret;
+        int ret;
+        unsigned int i;
+        unsigned int size;
+        uint8_t send_buf[2], recv_buf[3];
+        struct i2c_client *client = context;
+        struct i2c_msg msgs[2];
+
+        size = adau1701_register_size(&client->dev, reg);
+        if (size == 0)
+                return -EINVAL;
+
+        send_buf[0] = reg >> 8;
+        send_buf[1] = reg & 0xff;
+
+        msgs[0].addr = client->addr;
+        msgs[0].len = sizeof(send_buf);
+        msgs[0].buf = send_buf;
+        msgs[0].flags = 0;
+
+        msgs[1].addr = client->addr;
+        msgs[1].len = size;
+        msgs[1].buf = recv_buf;
+        msgs[1].flags = I2C_M_RD;
 
-        ret = snd_soc_cache_read(codec, reg, &value);
-        if (ret)
+        ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+        if (ret < 0)
                 return ret;
+        else if (ret != ARRAY_SIZE(msgs))
+                return -EIO;
+
+        *value = 0;
+
+        for (i = 0; i < size; i++)
+                *value |= recv_buf[i] << (i * 8);
 
-        return value;
+        return 0;
 }
 
-static int adau1701_load_firmware(struct snd_soc_codec *codec)
+static int adau1701_reset(struct snd_soc_codec *codec, unsigned int clkdiv)
 {
-        return process_sigma_firmware(codec->control_data, ADAU1701_FIRMWARE);
+        struct adau1701 *adau1701 = snd_soc_codec_get_drvdata(codec);
+        struct i2c_client *client = to_i2c_client(codec->dev);
+        int ret;
+
+        if (clkdiv != ADAU1707_CLKDIV_UNSET &&
+            gpio_is_valid(adau1701->gpio_pll_mode[0]) &&
+            gpio_is_valid(adau1701->gpio_pll_mode[1])) {
+                switch (clkdiv) {
+                case 64:
+                        gpio_set_value(adau1701->gpio_pll_mode[0], 0);
+                        gpio_set_value(adau1701->gpio_pll_mode[1], 0);
+                        break;
+                case 256:
+                        gpio_set_value(adau1701->gpio_pll_mode[0], 0);
+                        gpio_set_value(adau1701->gpio_pll_mode[1], 1);
+                        break;
+                case 384:
+                        gpio_set_value(adau1701->gpio_pll_mode[0], 1);
+                        gpio_set_value(adau1701->gpio_pll_mode[1], 0);
+                        break;
+                case 0: /* fallback */
+                case 512:
+                        gpio_set_value(adau1701->gpio_pll_mode[0], 1);
+                        gpio_set_value(adau1701->gpio_pll_mode[1], 1);
+                        break;
+                }
+        }
+
+        adau1701->pll_clkdiv = clkdiv;
+
+        if (gpio_is_valid(adau1701->gpio_nreset)) {
+                gpio_set_value(adau1701->gpio_nreset, 0);
+                /* minimum reset time is 20ns */
+                udelay(1);
+                gpio_set_value(adau1701->gpio_nreset, 1);
+                /* power-up time may be as long as 85ms */
+                mdelay(85);
+        }
+
+        /*
+         * Postpone the firmware download to a point in time when we
+         * know the correct PLL setup
+         */
+        if (clkdiv != ADAU1707_CLKDIV_UNSET) {
+                ret = process_sigma_firmware(client, ADAU1701_FIRMWARE);
+                if (ret) {
+                        dev_warn(codec->dev, "Failed to load firmware\n");
+                        return ret;
+                }
+        }
+
+        regmap_write(adau1701->regmap, ADAU1701_DACSET, ADAU1701_DACSET_DACINIT);
+        regmap_write(adau1701->regmap, ADAU1701_DSPCTRL, ADAU1701_DSPCTRL_CR);
+
+        regcache_mark_dirty(adau1701->regmap);
+        regcache_sync(adau1701->regmap);
+
+        return 0;
 }
 
 static int adau1701_set_capture_pcm_format(struct snd_soc_codec *codec,
@@ -259,8 +372,22 @@ static int adau1701_hw_params(struct snd_pcm_substream *substream,
                 struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 {
         struct snd_soc_codec *codec = dai->codec;
+        struct adau1701 *adau1701 = snd_soc_codec_get_drvdata(codec);
+        unsigned int clkdiv = adau1701->sysclk / params_rate(params);
         snd_pcm_format_t format;
         unsigned int val;
+        int ret;
+
+        /*
+         * If the mclk/lrclk ratio changes, the chip needs updated PLL
+         * mode GPIO settings, and a full reset cycle, including a new
+         * firmware upload.
+         */
+        if (clkdiv != adau1701->pll_clkdiv) {
+                ret = adau1701_reset(codec, clkdiv);
+                if (ret < 0)
+                        return ret;
+        }
 
         switch (params_rate(params)) {
         case 192000:
@@ -352,8 +479,8 @@ static int adau1701_set_dai_fmt(struct snd_soc_dai *codec_dai,
 
         adau1701->dai_fmt = fmt & SND_SOC_DAIFMT_FORMAT_MASK;
 
-        snd_soc_write(codec, ADAU1701_SERICTL, serictl);
-        snd_soc_update_bits(codec, ADAU1701_SEROCTL,
+        regmap_write(adau1701->regmap, ADAU1701_SERICTL, serictl);
+        regmap_update_bits(adau1701->regmap, ADAU1701_SEROCTL,
                 ~ADAU1701_SEROCTL_WORD_LEN_MASK, seroctl);
 
         return 0;
@@ -403,6 +530,7 @@ static int adau1701_set_sysclk(struct snd_soc_codec *codec, int clk_id,
         int source, unsigned int freq, int dir)
 {
         unsigned int val;
+        struct adau1701 *adau1701 = snd_soc_codec_get_drvdata(codec);
 
         switch (clk_id) {
         case ADAU1701_CLK_SRC_OSC:
@@ -416,6 +544,7 @@ static int adau1701_set_sysclk(struct snd_soc_codec *codec, int clk_id,
         }
 
         snd_soc_update_bits(codec, ADAU1701_OSCIPOW, ADAU1701_OSCIPOW_OPD, val);
+        adau1701->sysclk = freq;
 
         return 0;
 }
@@ -452,18 +581,47 @@ static struct snd_soc_dai_driver adau1701_dai = {
         .symmetric_rates = 1,
 };
 
+#ifdef CONFIG_OF
+static const struct of_device_id adau1701_dt_ids[] = {
+        { .compatible = "adi,adau1701", },
+        { }
+};
+MODULE_DEVICE_TABLE(of, adau1701_dt_ids);
+#endif
+
 static int adau1701_probe(struct snd_soc_codec *codec)
 {
-        int ret;
+        int i, ret;
+        unsigned int val;
+        struct adau1701 *adau1701 = snd_soc_codec_get_drvdata(codec);
 
         codec->control_data = to_i2c_client(codec->dev);
 
-        ret = adau1701_load_firmware(codec);
-        if (ret)
-                dev_warn(codec->dev, "Failed to load firmware\n");
+        /*
+         * Let the pll_clkdiv variable default to something that won't happen
+         * at runtime. That way, we can postpone the firmware download from
+         * adau1701_reset() to a point in time when we know the correct PLL
+         * mode parameters.
+         */
+        adau1701->pll_clkdiv = ADAU1707_CLKDIV_UNSET;
+
+        /* initalize with pre-configured pll mode settings */
+        ret = adau1701_reset(codec, adau1701->pll_clkdiv);
+        if (ret < 0)
+                return ret;
+
+        /* set up pin config */
+        val = 0;
+        for (i = 0; i < 6; i++)
+                val |= adau1701->pin_config[i] << (i * 4);
 
-        snd_soc_write(codec, ADAU1701_DACSET, ADAU1701_DACSET_DACINIT);
-        snd_soc_write(codec, ADAU1701_DSPCTRL, ADAU1701_DSPCTRL_CR);
+        regmap_write(adau1701->regmap, ADAU1701_PINCONF_0, val);
+
+        val = 0;
+        for (i = 0; i < 6; i++)
+                val |= adau1701->pin_config[i + 6] << (i * 4);
+
+        regmap_write(adau1701->regmap, ADAU1701_PINCONF_1, val);
 
         return 0;
 }
@@ -473,9 +631,6 @@ static struct snd_soc_codec_driver adau1701_codec_drv = {
         .set_bias_level         = adau1701_set_bias_level,
         .idle_bias_off          = true,
 
-        .reg_cache_size         = ADAU1701_NUM_REGS,
-        .reg_word_size          = sizeof(u16),
-
         .controls               = adau1701_controls,
         .num_controls           = ARRAY_SIZE(adau1701_controls),
         .dapm_widgets           = adau1701_dapm_widgets,
@@ -483,22 +638,86 @@ static struct snd_soc_codec_driver adau1701_codec_drv = {
         .dapm_routes            = adau1701_dapm_routes,
         .num_dapm_routes        = ARRAY_SIZE(adau1701_dapm_routes),
 
-        .write                  = adau1701_write,
-        .read                   = adau1701_read,
-
         .set_sysclk             = adau1701_set_sysclk,
 };
 
+static const struct regmap_config adau1701_regmap = {
+        .reg_bits               = 16,
+        .val_bits               = 32,
+        .max_register           = ADAU1701_MAX_REGISTER,
+        .cache_type             = REGCACHE_RBTREE,
+        .volatile_reg           = adau1701_volatile_reg,
+        .reg_write              = adau1701_reg_write,
+        .reg_read               = adau1701_reg_read,
+};
+
 static int adau1701_i2c_probe(struct i2c_client *client,
                               const struct i2c_device_id *id)
 {
         struct adau1701 *adau1701;
+        struct device *dev = &client->dev;
+        int gpio_nreset = -EINVAL;
+        int gpio_pll_mode[2] = { -EINVAL, -EINVAL };
         int ret;
 
-        adau1701 = devm_kzalloc(&client->dev, sizeof(*adau1701), GFP_KERNEL);
+        adau1701 = devm_kzalloc(dev, sizeof(*adau1701), GFP_KERNEL);
         if (!adau1701)
                 return -ENOMEM;
 
+        adau1701->regmap = devm_regmap_init(dev, NULL, client,
+                                            &adau1701_regmap);
+        if (IS_ERR(adau1701->regmap))
+                return PTR_ERR(adau1701->regmap);
+
+        if (dev->of_node) {
+                gpio_nreset = of_get_named_gpio(dev->of_node, "reset-gpio", 0);
+                if (gpio_nreset < 0 && gpio_nreset != -ENOENT)
+                        return gpio_nreset;
+
+                gpio_pll_mode[0] = of_get_named_gpio(dev->of_node,
+                                                   "adi,pll-mode-gpios", 0);
+                if (gpio_pll_mode[0] < 0 && gpio_pll_mode[0] != -ENOENT)
+                        return gpio_pll_mode[0];
+
+                gpio_pll_mode[1] = of_get_named_gpio(dev->of_node,
+                                                   "adi,pll-mode-gpios", 1);
+                if (gpio_pll_mode[1] < 0 && gpio_pll_mode[1] != -ENOENT)
+                        return gpio_pll_mode[1];
+
+                of_property_read_u32(dev->of_node, "adi,pll-clkdiv",
+                                     &adau1701->pll_clkdiv);
+
+                of_property_read_u8_array(dev->of_node, "adi,pin-config",
+                                          adau1701->pin_config,
+                                          ARRAY_SIZE(adau1701->pin_config));
+        }
+
+        if (gpio_is_valid(gpio_nreset)) {
+                ret = devm_gpio_request_one(dev, gpio_nreset, GPIOF_OUT_INIT_LOW,
+                                            "ADAU1701 Reset");
+                if (ret < 0)
+                        return ret;
+        }
+
+        if (gpio_is_valid(gpio_pll_mode[0]) &&
+            gpio_is_valid(gpio_pll_mode[1])) {
+                ret = devm_gpio_request_one(dev, gpio_pll_mode[0],
+                                            GPIOF_OUT_INIT_LOW,
+                                            "ADAU1701 PLL mode 0");
+                if (ret < 0)
+                        return ret;
+
+                ret = devm_gpio_request_one(dev, gpio_pll_mode[1],
+                                            GPIOF_OUT_INIT_LOW,
+                                            "ADAU1701 PLL mode 1");
+                if (ret < 0)
+                        return ret;
+        }
+
+        adau1701->gpio_nreset = gpio_nreset;
+        adau1701->gpio_pll_mode[0] = gpio_pll_mode[0];
+        adau1701->gpio_pll_mode[1] = gpio_pll_mode[1];
+
         i2c_set_clientdata(client, adau1701);
         ret = snd_soc_register_codec(&client->dev, &adau1701_codec_drv,
                         &adau1701_dai, 1);
@@ -521,6 +740,7 @@ static struct i2c_driver adau1701_i2c_driver = {
         .driver = {
                 .name   = "adau1701",
                 .owner  = THIS_MODULE,
+                .of_match_table = of_match_ptr(adau1701_dt_ids),
         },
         .probe          = adau1701_i2c_probe,
         .remove         = adau1701_i2c_remove,