[PATCH V2] regulator: pwm: Prints error number along with detail

From: Laxman Dewangan
Date: Mon Mar 14 2016 - 09:04:02 EST


Prints the error number along with error message when any
error occurs. This help on getting the reason of failure
quickly from log without any code instrument.

Signed-off-by: Laxman Dewangan <ldewangan@xxxxxxxxxx>
Cc: Lee Jones <lee.jones@xxxxxxxxxx>
---
This was part of the series:
regulator: pwm: Add supports for multiple instance and voltage linear step
But first 2 patches are already applied of this series, creating patch on top
of applied patches and resetting the patch count.

- Taken care of the comment for error print like it should be "foo: %d\n"
style.
- Added error number on all possible places.

drivers/regulator/pwm-regulator.c | 23 ++++++++++++-----------
1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c
index 4689d62..f99a697 100644
--- a/drivers/regulator/pwm-regulator.c
+++ b/drivers/regulator/pwm-regulator.c
@@ -70,7 +70,7 @@ static int pwm_regulator_set_voltage_sel(struct regulator_dev *rdev,

ret = pwm_config(drvdata->pwm, dutycycle, pwm_reg_period);
if (ret) {
- dev_err(&rdev->dev, "Failed to configure PWM\n");
+ dev_err(&rdev->dev, "Failed to configure PWM: %d\n", ret);
return ret;
}

@@ -146,13 +146,13 @@ static int pwm_regulator_set_voltage(struct regulator_dev *rdev,

ret = pwm_config(drvdata->pwm, (period / 100) * duty_cycle, period);
if (ret) {
- dev_err(&rdev->dev, "Failed to configure PWM\n");
+ dev_err(&rdev->dev, "Failed to configure PWM: %d\n", ret);
return ret;
}

ret = pwm_enable(drvdata->pwm);
if (ret) {
- dev_err(&rdev->dev, "Failed to enable PWM\n");
+ dev_err(&rdev->dev, "Failed to enable PWM: %d\n", ret);
return ret;
}
drvdata->volt_uV = min_uV;
@@ -200,8 +200,7 @@ static int pwm_regulator_init_table(struct platform_device *pdev,

if ((length < sizeof(*duty_cycle_table)) ||
(length % sizeof(*duty_cycle_table))) {
- dev_err(&pdev->dev,
- "voltage-table length(%d) is invalid\n",
+ dev_err(&pdev->dev, "voltage-table length(%d) is invalid\n",
length);
return -EINVAL;
}
@@ -214,7 +213,7 @@ static int pwm_regulator_init_table(struct platform_device *pdev,
(u32 *)duty_cycle_table,
length / sizeof(u32));
if (ret) {
- dev_err(&pdev->dev, "Failed to read voltage-table\n");
+ dev_err(&pdev->dev, "Failed to read voltage-table: %d\n", ret);
return ret;
}

@@ -277,16 +276,18 @@ static int pwm_regulator_probe(struct platform_device *pdev)

drvdata->pwm = devm_pwm_get(&pdev->dev, NULL);
if (IS_ERR(drvdata->pwm)) {
- dev_err(&pdev->dev, "Failed to get PWM\n");
- return PTR_ERR(drvdata->pwm);
+ ret = PTR_ERR(drvdata->pwm);
+ dev_err(&pdev->dev, "Failed to get PWM: %d\n", ret);
+ return ret;
}

regulator = devm_regulator_register(&pdev->dev,
&drvdata->desc, &config);
if (IS_ERR(regulator)) {
- dev_err(&pdev->dev, "Failed to register regulator %s\n",
- drvdata->desc.name);
- return PTR_ERR(regulator);
+ ret = PTR_ERR(regulator);
+ dev_err(&pdev->dev, "Failed to register regulator %s: %d\n",
+ drvdata->desc.name, ret);
+ return ret;
}

return 0;
--
2.1.4