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staging: iio: rework regulator handling

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Currently, the affected drivers ignore all errors from regulator_get().
The way it is now, it also breaks probe deferral (EPROBE_DEFER). The
correct behavior is to propagate the error to the upper layers so they
can handle it accordingly.

Rework the regulator handling so that it matches the standard behavior.
If the specific design uses a static always-on regulator and does not
explicitly specify it, regulator_get() will return the dummy regulator.

The following semantic patch was used to apply the change:
@r1@
expression reg, dev, en, volt;
@@

reg = \(devm_regulator_get\|regulator_get\)(dev, ...);
if (
- !
   IS_ERR(reg))
+	return PTR_ERR(reg);
(
- {	en = regulator_enable(reg);
-	if (en) return en; }
+
+	en = regulator_enable(reg);
+	if (en) {
+		dev_err(dev, "Failed to enable specified supply\n");
+		return en; }
|
+
- {	en = regulator_enable(reg);
-	if (en)	return en;
-	volt = regulator_get_voltage(reg); }
+	en = regulator_enable(reg);
+	if (en) {
+		dev_err(dev, "Failed to enable specified supply\n");
+		return en;
+	}
+	volt = regulator_get_voltage(reg);
)

@r2@
expression arg;
@@

-	if (!IS_ERR(arg)) regulator_disable(arg);
+	regulator_disable(arg);

Hand-edit the debugging prints with the supply name to become more
specific.

Suggested-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Eva Rachel Retuya <eraretuya@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Eva Rachel Retuya 2016-11-01 01:04:31 +08:00 committed by Jonathan Cameron
parent c834e1718a
commit 3925ff0fcb
5 changed files with 46 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/staging/iio/adc/ad7192.c
View File

@ -634,13 +634,15 @@ static int ad7192_probe(struct spi_device *spi)
st = iio_priv(indio_dev);
st->reg = devm_regulator_get(&spi->dev, "avdd");
if (!IS_ERR(st->reg)) {
ret = regulator_enable(st->reg);
if (ret)
return ret;
if (IS_ERR(st->reg))
return PTR_ERR(st->reg);
voltage_uv = regulator_get_voltage(st->reg);
ret = regulator_enable(st->reg);
if (ret) {
dev_err(&spi->dev, "Failed to enable specified AVdd supply\n");
return ret;
}
voltage_uv = regulator_get_voltage(st->reg);
if (pdata->vref_mv)
st->int_vref_mv = pdata->vref_mv;
@ -689,8 +691,7 @@ static int ad7192_probe(struct spi_device *spi)
error_remove_trigger:
ad_sd_cleanup_buffer_and_trigger(indio_dev);
error_disable_reg:
if (!IS_ERR(st->reg))
regulator_disable(st->reg);
regulator_disable(st->reg);
return ret;
}
@ -703,8 +704,7 @@ static int ad7192_remove(struct spi_device *spi)
iio_device_unregister(indio_dev);
ad_sd_cleanup_buffer_and_trigger(indio_dev);
if (!IS_ERR(st->reg))
regulator_disable(st->reg);
regulator_disable(st->reg);
return 0;
}

18
drivers/staging/iio/adc/ad7780.c
View File

@ -174,13 +174,15 @@ static int ad7780_probe(struct spi_device *spi)
ad_sd_init(&st->sd, indio_dev, spi, &ad7780_sigma_delta_info);
st->reg = devm_regulator_get(&spi->dev, "avdd");
if (!IS_ERR(st->reg)) {
ret = regulator_enable(st->reg);
if (ret)
return ret;
if (IS_ERR(st->reg))
return PTR_ERR(st->reg);
voltage_uv = regulator_get_voltage(st->reg);
ret = regulator_enable(st->reg);
if (ret) {
dev_err(&spi->dev, "Failed to enable specified AVdd supply\n");
return ret;
}
voltage_uv = regulator_get_voltage(st->reg);
st->chip_info =
&ad7780_chip_info_tbl[spi_get_device_id(spi)->driver_data];
@ -222,8 +224,7 @@ static int ad7780_probe(struct spi_device *spi)
error_cleanup_buffer_and_trigger:
ad_sd_cleanup_buffer_and_trigger(indio_dev);
error_disable_reg:
if (!IS_ERR(st->reg))
regulator_disable(st->reg);
regulator_disable(st->reg);
return ret;
}
@ -236,8 +237,7 @@ static int ad7780_remove(struct spi_device *spi)
iio_device_unregister(indio_dev);
ad_sd_cleanup_buffer_and_trigger(indio_dev);
if (!IS_ERR(st->reg))
regulator_disable(st->reg);
regulator_disable(st->reg);
return 0;
}

17
drivers/staging/iio/frequency/ad9832.c
View File

@ -213,10 +213,13 @@ static int ad9832_probe(struct spi_device *spi)
}
reg = devm_regulator_get(&spi->dev, "avdd");
if (!IS_ERR(reg)) {
ret = regulator_enable(reg);
if (ret)
return ret;
if (IS_ERR(reg))
return PTR_ERR(reg);
ret = regulator_enable(reg);
if (ret) {
dev_err(&spi->dev, "Failed to enable specified AVDD supply\n");
return ret;
}
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
@ -311,8 +314,7 @@ static int ad9832_probe(struct spi_device *spi)
return 0;
error_disable_reg:
if (!IS_ERR(reg))
regulator_disable(reg);
regulator_disable(reg);
return ret;
}
@ -323,8 +325,7 @@ static int ad9832_remove(struct spi_device *spi)
struct ad9832_state *st = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
if (!IS_ERR(st->reg))
regulator_disable(st->reg);
regulator_disable(st->reg);
return 0;
}

17
drivers/staging/iio/frequency/ad9834.c
View File

@ -330,10 +330,13 @@ static int ad9834_probe(struct spi_device *spi)
}
reg = devm_regulator_get(&spi->dev, "avdd");
if (!IS_ERR(reg)) {
ret = regulator_enable(reg);
if (ret)
return ret;
if (IS_ERR(reg))
return PTR_ERR(reg);
ret = regulator_enable(reg);
if (ret) {
dev_err(&spi->dev, "Failed to enable specified AVDD supply\n");
return ret;
}
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
@ -416,8 +419,7 @@ static int ad9834_probe(struct spi_device *spi)
return 0;
error_disable_reg:
if (!IS_ERR(reg))
regulator_disable(reg);
regulator_disable(reg);
return ret;
}
@ -428,8 +430,7 @@ static int ad9834_remove(struct spi_device *spi)
struct ad9834_state *st = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
if (!IS_ERR(st->reg))
regulator_disable(st->reg);
regulator_disable(st->reg);
return 0;
}

19
drivers/staging/iio/impedance-analyzer/ad5933.c
View File

@ -724,12 +724,15 @@ static int ad5933_probe(struct i2c_client *client,
pdata = &ad5933_default_pdata;
st->reg = devm_regulator_get(&client->dev, "vdd");
if (!IS_ERR(st->reg)) {
ret = regulator_enable(st->reg);
if (ret)
return ret;
voltage_uv = regulator_get_voltage(st->reg);
if (IS_ERR(st->reg))
return PTR_ERR(st->reg);
ret = regulator_enable(st->reg);
if (ret) {
dev_err(&client->dev, "Failed to enable specified VDD supply\n");
return ret;
}
voltage_uv = regulator_get_voltage(st->reg);
if (voltage_uv)
st->vref_mv = voltage_uv / 1000;
@ -772,8 +775,7 @@ static int ad5933_probe(struct i2c_client *client,
error_unreg_ring:
iio_kfifo_free(indio_dev->buffer);
error_disable_reg:
if (!IS_ERR(st->reg))
regulator_disable(st->reg);
regulator_disable(st->reg);
return ret;
}
@ -785,8 +787,7 @@ static int ad5933_remove(struct i2c_client *client)
iio_device_unregister(indio_dev);
iio_kfifo_free(indio_dev->buffer);
if (!IS_ERR(st->reg))
regulator_disable(st->reg);
regulator_disable(st->reg);
return 0;
}