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authorAxel Lin <axel.lin@gmail.com>2010-09-18 09:13:28 +0400
committerLiam Girdwood <lrg@slimlogic.co.uk>2010-10-29 01:40:31 +0400
commit993af7c048f414121bc81e0d6e69456e3862a06b (patch)
tree26b8990dddfbd056d95b2ac0458af0103ed080c4 /drivers/regulator/lp3972.c
parent5976f0959d5251ae5b4db848eaa2f42a19e98652 (diff)
downloadlinux-993af7c048f414121bc81e0d6e69456e3862a06b.tar.xz
Regulator: lp3972 cleanup
This patch includes below fixes based on Mark's comment. - Return actual error if i2c_smbus_read_byte_data() fail - Add spaces around bitwise AND operator(&) to improve readability - Add comment to explain why we need to update voltage change control register for LDO1 and LDO5 - Logging the value for diagnostics if chip reported incorrect voltage value - Add __devinit annotation for setup_regulators() - Show system control register1 value if the value is mismatched - Logging the value for diagnostics if failed to detect device Signed-off-by: Axel Lin <axel.lin@gmail.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'drivers/regulator/lp3972.c')
-rw-r--r--drivers/regulator/lp3972.c25
1 files changed, 18 insertions, 7 deletions
diff --git a/drivers/regulator/lp3972.c b/drivers/regulator/lp3972.c
index 0d9b47569c1b..e07062fd0b42 100644
--- a/drivers/regulator/lp3972.c
+++ b/drivers/regulator/lp3972.c
@@ -192,7 +192,7 @@ static int lp3972_i2c_read(struct i2c_client *i2c, char reg, int count,
return -EIO;
ret = i2c_smbus_read_byte_data(i2c, reg);
if (ret < 0)
- return -EIO;
+ return ret;
*dest = ret;
return 0;
@@ -215,7 +215,7 @@ static u8 lp3972_reg_read(struct lp3972 *lp3972, u8 reg)
lp3972_i2c_read(lp3972->i2c, reg, 1, &val);
dev_dbg(lp3972->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
- (unsigned)val&0xff);
+ (unsigned)val & 0xff);
mutex_unlock(&lp3972->io_lock);
@@ -234,7 +234,7 @@ static int lp3972_set_bits(struct lp3972 *lp3972, u8 reg, u16 mask, u16 val)
if (ret == 0) {
ret = lp3972_i2c_write(lp3972->i2c, reg, 1, &tmp);
dev_dbg(lp3972->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
- (unsigned)val&0xff);
+ (unsigned)val & 0xff);
}
mutex_unlock(&lp3972->io_lock);
@@ -320,6 +320,13 @@ static int lp3972_ldo_set_voltage(struct regulator_dev *dev,
if (ret)
return ret;
+ /*
+ * LDO1 and LDO5 support voltage control by either target voltage1
+ * or target voltage2 register.
+ * We use target voltage1 register for LDO1 and LDO5 in this driver.
+ * We need to update voltage change control register(0x20) to enable
+ * LDO1 and LDO5 to change to their programmed target values.
+ */
switch (ldo) {
case LP3972_LDO1:
case LP3972_LDO5:
@@ -401,7 +408,8 @@ static int lp3972_dcdc_get_voltage(struct regulator_dev *dev)
val = 1000 * buck_voltage_map[buck][reg];
else {
val = 0;
- dev_warn(&dev->dev, "chip reported incorrect voltage value.\n");
+ dev_warn(&dev->dev, "chip reported incorrect voltage value."
+ " reg = %d\n", reg);
}
return val;
@@ -523,7 +531,7 @@ static struct regulator_desc regulators[] = {
},
};
-static int setup_regulators(struct lp3972 *lp3972,
+static int __devinit setup_regulators(struct lp3972 *lp3972,
struct lp3972_platform_data *pdata)
{
int i, err;
@@ -584,10 +592,13 @@ static int __devinit lp3972_i2c_probe(struct i2c_client *i2c,
/* Detect LP3972 */
ret = lp3972_i2c_read(i2c, LP3972_SYS_CONTROL1_REG, 1, &val);
- if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
+ if (ret == 0 &&
+ (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL) {
ret = -ENODEV;
+ dev_err(&i2c->dev, "chip reported: val = 0x%x\n", val);
+ }
if (ret < 0) {
- dev_err(&i2c->dev, "failed to detect device\n");
+ dev_err(&i2c->dev, "failed to detect device. ret = %d\n", ret);
goto err_detect;
}