regulator: max8649 Convert max8649 to use regmap api

Signed-off-by: Jonghwan Choi <jhbird.choi@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 55 insertions, 100 deletions

diff --git a/drivers/regulator/max8649.c b/drivers/regulator/max8649.c
index 1062cf9f02dc..c54d0ad18c73 100644
--- a/drivers/regulator/max8649.c
+++ b/drivers/regulator/max8649.c
@@ -16,6 +16,7 @@
 #include <linux/regulator/driver.h>
 #include <linux/slab.h>
 #include <linux/regulator/max8649.h>
+#include <linux/regmap.h>
 
 #define MAX8649_DCDC_VMIN       750000          /* uV */
 #define MAX8649_DCDC_VMAX       1380000         /* uV */
@@ -49,9 +50,8 @@
 
 struct max8649_regulator_info {
         struct regulator_dev    *regulator;
-        struct i2c_client       *i2c;
         struct device           *dev;
-        struct mutex            io_lock;
+        struct regmap           *regmap;
 
         int             vol_reg;
         unsigned        mode:2; /* bit[1:0] = VID1, VID0 */
@@ -63,71 +63,6 @@ struct max8649_regulator_info {
 
 /* I2C operations */
 
-static inline int max8649_read_device(struct i2c_client *i2c,
-                                      int reg, int bytes, void *dest)
-{
-        unsigned char data;
-        int ret;
-
-        data = (unsigned char)reg;
-        ret = i2c_master_send(i2c, &data, 1);
-        if (ret < 0)
-                return ret;
-        ret = i2c_master_recv(i2c, dest, bytes);
-        if (ret < 0)
-                return ret;
-        return 0;
-}
-
-static inline int max8649_write_device(struct i2c_client *i2c,
-                                       int reg, int bytes, void *src)
-{
-        unsigned char buf[bytes + 1];
-        int ret;
-
-        buf[0] = (unsigned char)reg;
-        memcpy(&buf[1], src, bytes);
-
-        ret = i2c_master_send(i2c, buf, bytes + 1);
-        if (ret < 0)
-                return ret;
-        return 0;
-}
-
-static int max8649_reg_read(struct i2c_client *i2c, int reg)
-{
-        struct max8649_regulator_info *info = i2c_get_clientdata(i2c);
-        unsigned char data;
-        int ret;
-
-        mutex_lock(&info->io_lock);
-        ret = max8649_read_device(i2c, reg, 1, &data);
-        mutex_unlock(&info->io_lock);
-
-        if (ret < 0)
-                return ret;
-        return (int)data;
-}
-
-static int max8649_set_bits(struct i2c_client *i2c, int reg,
-                            unsigned char mask, unsigned char data)
-{
-        struct max8649_regulator_info *info = i2c_get_clientdata(i2c);
-        unsigned char value;
-        int ret;
-
-        mutex_lock(&info->io_lock);
-        ret = max8649_read_device(i2c, reg, 1, &value);
-        if (ret < 0)
-                goto out;
-        value &= ~mask;
-        value |= data;
-        ret = max8649_write_device(i2c, reg, 1, &value);
-out:
-        mutex_unlock(&info->io_lock);
-        return ret;
-}
-
 static inline int check_range(int min_uV, int max_uV)
 {
         if ((min_uV < MAX8649_DCDC_VMIN) || (max_uV > MAX8649_DCDC_VMAX)
@@ -144,13 +79,14 @@ static int max8649_list_voltage(struct regulator_dev *rdev, unsigned index)
 static int max8649_get_voltage(struct regulator_dev *rdev)
 {
         struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
+        unsigned int val;
         unsigned char data;
         int ret;
 
-        ret = max8649_reg_read(info->i2c, info->vol_reg);
-        if (ret < 0)
+        ret = regmap_read(info->regmap, info->vol_reg, &val);
+        if (ret != 0)
                 return ret;
-        data = (unsigned char)ret & MAX8649_VOL_MASK;
+        data = (unsigned char)val & MAX8649_VOL_MASK;
         return max8649_list_voltage(rdev, data);
 }
 
@@ -170,14 +106,14 @@ static int max8649_set_voltage(struct regulator_dev *rdev,
         mask = MAX8649_VOL_MASK;
         *selector = data & mask;
 
-        return max8649_set_bits(info->i2c, info->vol_reg, mask, data);
+        return regmap_update_bits(info->regmap, info->vol_reg, mask, data);
 }
 
 /* EN_PD means pulldown on EN input */
 static int max8649_enable(struct regulator_dev *rdev)
 {
         struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
-        return max8649_set_bits(info->i2c, MAX8649_CONTROL, MAX8649_EN_PD, 0);
+        return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD, 0);
 }
 
 /*
@@ -187,38 +123,40 @@ static int max8649_enable(struct regulator_dev *rdev)
 static int max8649_disable(struct regulator_dev *rdev)
 {
         struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
-        return max8649_set_bits(info->i2c, MAX8649_CONTROL, MAX8649_EN_PD,
+        return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD,
                                 MAX8649_EN_PD);
 }
 
 static int max8649_is_enabled(struct regulator_dev *rdev)
 {
         struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
+        unsigned int val;
         int ret;
 
-        ret = max8649_reg_read(info->i2c, MAX8649_CONTROL);
-        if (ret < 0)
+        ret = regmap_read(info->regmap, MAX8649_CONTROL, &val);
+        if (ret != 0)
                 return ret;
-        return !((unsigned char)ret & MAX8649_EN_PD);
+        return !((unsigned char)val & MAX8649_EN_PD);
 }
 
 static int max8649_enable_time(struct regulator_dev *rdev)
 {
         struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
         int voltage, rate, ret;
+        unsigned int val;
 
         /* get voltage */
-        ret = max8649_reg_read(info->i2c, info->vol_reg);
-        if (ret < 0)
+        ret = regmap_read(info->regmap, info->vol_reg, &val);
+        if (ret != 0)
                 return ret;
-        ret &= MAX8649_VOL_MASK;
+        val &= MAX8649_VOL_MASK;
         voltage = max8649_list_voltage(rdev, (unsigned char)ret); /* uV */
 
         /* get rate */
-        ret = max8649_reg_read(info->i2c, MAX8649_RAMP);
-        if (ret < 0)
+        ret = regmap_read(info->regmap, MAX8649_RAMP, &val);
+        if (ret != 0)
                 return ret;
-        ret = (ret & MAX8649_RAMP_MASK) >> 5;
+        ret = (val & MAX8649_RAMP_MASK) >> 5;
         rate = (32 * 1000) >> ret;      /* uV/uS */
 
         return DIV_ROUND_UP(voltage, rate);
@@ -230,12 +168,12 @@ static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)
 
         switch (mode) {
         case REGULATOR_MODE_FAST:
-                max8649_set_bits(info->i2c, info->vol_reg, MAX8649_FORCE_PWM,
-                                 MAX8649_FORCE_PWM);
+                regmap_update_bits(info->regmap, info->vol_reg, MAX8649_FORCE_PWM,
+                                   MAX8649_FORCE_PWM);
                 break;
         case REGULATOR_MODE_NORMAL:
-                max8649_set_bits(info->i2c, info->vol_reg,
-                                 MAX8649_FORCE_PWM, 0);
+                regmap_update_bits(info->regmap, info->vol_reg,
+                                   MAX8649_FORCE_PWM, 0);
                 break;
         default:
                 return -EINVAL;
@@ -246,10 +184,13 @@ static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)
 static unsigned int max8649_get_mode(struct regulator_dev *rdev)
 {
         struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
+        unsigned int val;
         int ret;
 
-        ret = max8649_reg_read(info->i2c, info->vol_reg);
-        if (ret & MAX8649_FORCE_PWM)
+        ret = regmap_read(info->regmap, info->vol_reg, &val);
+        if (ret != 0)
+                return ret;
+        if (val & MAX8649_FORCE_PWM)
                 return REGULATOR_MODE_FAST;
         return REGULATOR_MODE_NORMAL;
 }
@@ -275,11 +216,17 @@ static struct regulator_desc dcdc_desc = {
         .owner          = THIS_MODULE,
 };
 
+static struct regmap_config max8649_regmap_config = {
+        .reg_bits = 8,
+        .val_bits = 8,
+};
+
 static int __devinit max8649_regulator_probe(struct i2c_client *client,
                                              const struct i2c_device_id *id)
 {
         struct max8649_platform_data *pdata = client->dev.platform_data;
         struct max8649_regulator_info *info = NULL;
+        unsigned int val;
         unsigned char data;
         int ret;
 
@@ -289,9 +236,14 @@ static int __devinit max8649_regulator_probe(struct i2c_client *client,
                 return -ENOMEM;
         }
 
-        info->i2c = client;
+        info->regmap = regmap_init_i2c(client, &max8649_regmap_config);
+        if (IS_ERR(info->regmap)) {
+                ret = PTR_ERR(info->regmap);
+                dev_err(&client->dev, "Failed to allocate register map: %d\n", ret);
+                goto fail;
+        }
+
         info->dev = &client->dev;
-        mutex_init(&info->io_lock);
         i2c_set_clientdata(client, info);
 
         info->mode = pdata->mode;
@@ -312,8 +264,8 @@ static int __devinit max8649_regulator_probe(struct i2c_client *client,
                 break;
         }
 
-        ret = max8649_reg_read(info->i2c, MAX8649_CHIP_ID1);
-        if (ret < 0) {
+        ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val);
+        if (ret != 0) {
                 dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",
                         ret);
                 goto out;
@@ -321,29 +273,29 @@ static int __devinit max8649_regulator_probe(struct i2c_client *client,
         dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", ret);
 
         /* enable VID0 & VID1 */
-        max8649_set_bits(info->i2c, MAX8649_CONTROL, MAX8649_VID_MASK, 0);
+        regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0);
 
         /* enable/disable external clock synchronization */
         info->extclk = pdata->extclk;
         data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0;
-        max8649_set_bits(info->i2c, info->vol_reg, MAX8649_SYNC_EXTCLK, data);
+        regmap_update_bits(info->regmap, info->vol_reg, MAX8649_SYNC_EXTCLK, data);
         if (info->extclk) {
                 /* set external clock frequency */
                 info->extclk_freq = pdata->extclk_freq;
-                max8649_set_bits(info->i2c, MAX8649_SYNC, MAX8649_EXT_MASK,
-                                 info->extclk_freq << 6);
+                regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK,
+                                   info->extclk_freq << 6);
         }
 
         if (pdata->ramp_timing) {
                 info->ramp_timing = pdata->ramp_timing;
-                max8649_set_bits(info->i2c, MAX8649_RAMP, MAX8649_RAMP_MASK,
-                                 info->ramp_timing << 5);
+                regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK,
+                                   info->ramp_timing << 5);
         }
 
         info->ramp_down = pdata->ramp_down;
         if (info->ramp_down) {
-                max8649_set_bits(info->i2c, MAX8649_RAMP, MAX8649_RAMP_DOWN,
-                                 MAX8649_RAMP_DOWN);
+                regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN,
+                                   MAX8649_RAMP_DOWN);
         }
 
         info->regulator = regulator_register(&dcdc_desc, &client->dev,
@@ -358,6 +310,8 @@ static int __devinit max8649_regulator_probe(struct i2c_client *client,
         dev_info(info->dev, "Max8649 regulator device is detected.\n");
         return 0;
 out:
+        regmap_exit(info->regmap);
+fail:
         kfree(info);
         return ret;
 }
@@ -369,6 +323,7 @@ static int __devexit max8649_regulator_remove(struct i2c_client *client)
         if (info) {
                 if (info->regulator)
                         regulator_unregister(info->regulator);
+                regmap_exit(info->regmap);
                 kfree(info);
         }