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Date: Fri, 17 Sep 2010 13:44:17 +0800 From: Axel Lin <axel.lin@...il.com> To: linux-kernel <linux-kernel@...r.kernel.org> Cc: Liam Girdwood <lrg@...mlogic.co.uk>, Mark Brown <broonie@...nsource.wolfsonmicro.com> Subject: [PATCH] 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() - Logging the value for diagnostics if failed to detect device Signed-off-by: Axel Lin <axel.lin@...il.com> --- Each fix item is trivial, so I sent the fixes in one patch. drivers/regulator/lp3972.c | 20 ++++++++++++++------ 1 files changed, 14 insertions(+), 6 deletions(-) diff --git a/drivers/regulator/lp3972.c b/drivers/regulator/lp3972.c index 0d9b475..c22650a 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; @@ -587,7 +595,7 @@ static int __devinit lp3972_i2c_probe(struct i2c_client *i2c, if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL) ret = -ENODEV; if (ret < 0) { - dev_err(&i2c->dev, "failed to detect device\n"); + dev_err(&i2c->dev, "failed to detect device: %d\n", ret); goto err_detect; } -- 1.7.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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