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yaml
---
r: 282159
b: refs/heads/master
c: c5b68d4
h: refs/heads/master
i:
  282157: 525c007
  282155: cebeef0
  282151: 5def186
  282143: 55aa057
v: v3
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Jonghwan Choi authored and Mark Brown committed Nov 23, 2011
1 parent 5290082 commit 022b7b2
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Showing 3 changed files with 57 additions and 101 deletions.
2 changes: 1 addition & 1 deletion [refs]
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@@ -1,2 +1,2 @@
---
refs/heads/master: 43530b69d758328d3ffe6ab98fd640463e8e3667
refs/heads/master: c5b68d47bb06ca0df9c4d1a1ce5a46ee879aa85c
1 change: 1 addition & 0 deletions trunk/drivers/regulator/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,7 @@ config REGULATOR_MAX1586
config REGULATOR_MAX8649
tristate "Maxim 8649 voltage regulator"
depends on I2C
select REGMAP_I2C
help
This driver controls a Maxim 8649 voltage output regulator via
I2C bus.
Expand Down
155 changes: 55 additions & 100 deletions trunk/drivers/regulator/max8649.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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 */
Expand Down Expand Up @@ -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 */
Expand All @@ -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)
Expand All @@ -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);
}

Expand All @@ -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);
}

/*
Expand All @@ -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);
Expand All @@ -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;
Expand All @@ -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;
}
Expand All @@ -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;

Expand All @@ -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;
Expand All @@ -312,38 +264,38 @@ 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;
}
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,
Expand All @@ -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;
}
Expand All @@ -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);
}

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