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Date: Fri, 3 Sep 2010 10:15:24 +0900
From: Kukjin Kim <kgene.kim@...sung.com>
To: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org
Cc: lrg@...mlogic.co.uk, Changhwan Youn <chaos.youn@...sung.com>,
Kukjin Kim <kgene.kim@...sung.com>
Subject: [PATCH] regulators: add support max8952 regulator
From: Changhwan Youn <chaos.youn@...sung.com>
The operation of max8952 is almost similar to max8649 except
the output voltage range. This patch adds support the max8952
regulator using current max8649 implementation.
Signed-off-by: Changhwan Youn <chaos.youn@...sung.com>
Signed-off-by: Kukjin Kim <kgene.kim@...sung.com>
---
drivers/regulator/Kconfig | 4 ++--
drivers/regulator/max8649.c | 43 ++++++++++++++++++++++++++++++++++++-------
2 files changed, 38 insertions(+), 9 deletions(-)
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 172951b..fab9a90 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -81,10 +81,10 @@ config REGULATOR_MAX1586
for PXA27x chips to control VCC_CORE and VCC_USIM voltages.
config REGULATOR_MAX8649
- tristate "Maxim 8649 voltage regulator"
+ tristate "Maxim 8649/8952 voltage regulator"
depends on I2C
help
- This driver controls a Maxim 8649 voltage output regulator via
+ This driver controls a Maxim 8649/8952 voltage output regulator via
I2C bus.
config REGULATOR_MAX8660
diff --git a/drivers/regulator/max8649.c b/drivers/regulator/max8649.c
index 4520ace..f5d034c 100644
--- a/drivers/regulator/max8649.c
+++ b/drivers/regulator/max8649.c
@@ -22,6 +22,9 @@
#define MAX8649_DCDC_STEP 10000 /* uV */
#define MAX8649_VOL_MASK 0x3f
+/* difference between voltages of max8649 and max8952 */
+#define DIFF_MAX8952_DCDC_VOL 20000 /* uV */
+
/* Registers */
#define MAX8649_MODE0 0x00
#define MAX8649_MODE1 0x01
@@ -47,6 +50,11 @@
#define MAX8649_RAMP_MASK (7 << 5)
#define MAX8649_RAMP_DOWN (1 << 1)
+enum chips {
+ MAX8649,
+ MAX8952
+};
+
struct max8649_regulator_info {
struct regulator_dev *regulator;
struct i2c_client *i2c;
@@ -54,6 +62,7 @@ struct max8649_regulator_info {
struct mutex io_lock;
int vol_reg;
+ int type;
unsigned mode:2; /* bit[1:0] = VID1, VID0 */
unsigned extclk_freq:2;
unsigned extclk:1;
@@ -138,7 +147,12 @@ static inline int check_range(int min_uV, int max_uV)
static int max8649_list_voltage(struct regulator_dev *rdev, unsigned index)
{
- return (MAX8649_DCDC_VMIN + index * MAX8649_DCDC_STEP);
+ struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
+ int ret = MAX8649_DCDC_VMIN + index * MAX8649_DCDC_STEP;
+
+ if (info->type == MAX8952)
+ ret += DIFF_MAX8952_DCDC_VOL;
+ return ret;
}
static int max8649_get_voltage(struct regulator_dev *rdev)
@@ -160,6 +174,11 @@ static int max8649_set_voltage(struct regulator_dev *rdev,
struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
unsigned char data, mask;
+ if (info->type == MAX8952) {
+ min_uV -= DIFF_MAX8952_DCDC_VOL;
+ max_uV -= DIFF_MAX8952_DCDC_VOL;
+ }
+
if (check_range(min_uV, max_uV)) {
dev_err(info->dev, "invalid voltage range (%d, %d) uV\n",
min_uV, max_uV);
@@ -263,7 +282,6 @@ static struct regulator_ops max8649_dcdc_ops = {
.enable_time = max8649_enable_time,
.set_mode = max8649_set_mode,
.get_mode = max8649_get_mode,
-
};
static struct regulator_desc dcdc_desc = {
@@ -281,6 +299,7 @@ static int __devinit max8649_regulator_probe(struct i2c_client *client,
struct max8649_regulator_info *info = NULL;
unsigned char data;
int ret;
+ int ret2;
info = kzalloc(sizeof(struct max8649_regulator_info), GFP_KERNEL);
if (!info) {
@@ -313,11 +332,20 @@ static int __devinit max8649_regulator_probe(struct i2c_client *client,
ret = max8649_reg_read(info->i2c, MAX8649_CHIP_ID1);
if (ret < 0) {
- dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",
- ret);
+ dev_err(info->dev, "Failed to detect ID of %s:%d\n",
+ id->name, ret);
+ goto out;
+ }
+
+ ret2 = max8649_reg_read(info->i2c, MAX8649_CHIP_ID2);
+ if (ret2 < 0) {
+ dev_err(info->dev, "Failed to detect ID of %s:%d\n",
+ id->name, ret2);
goto out;
}
- dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", ret);
+ dev_info(info->dev, "Detected %s (ID:%x %x)\n", id->name, ret, ret2);
+
+ info->type = id->driver_data;
/* enable VID0 & VID1 */
max8649_set_bits(info->i2c, MAX8649_CONTROL, MAX8649_VID_MASK, 0);
@@ -354,7 +382,7 @@ static int __devinit max8649_regulator_probe(struct i2c_client *client,
goto out;
}
- dev_info(info->dev, "Max8649 regulator device is detected.\n");
+ dev_info(info->dev, "%s regulator device is detected.\n", id->name);
return 0;
out:
kfree(info);
@@ -375,7 +403,8 @@ static int __devexit max8649_regulator_remove(struct i2c_client *client)
}
static const struct i2c_device_id max8649_id[] = {
- { "max8649", 0 },
+ { "max8649", MAX8649 },
+ { "max8952", MAX8952 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max8649_id);
--
1.6.2.5
--
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