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iio: light: al3010: Implement regmap support

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Modernize and clean up the driver using the regmap framework.

With the regmap implementation, the compiler produces
a significantly smaller module.

Size before: 72 kB
Size after:  58 kB

Signed-off-by: David Heidelberg <david@ixit.cz>
Link: https://patch.msgid.link/20250402-al3010-iio-regmap-v4-4-d189bea87261@ixit.cz
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
David Heidelberg 2025-04-02 21:33:27 +02:00 committed by Jonathan Cameron
parent b8154f3477
commit 0e5e21e23d
1 changed files with 44 additions and 38 deletions
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82
drivers/iio/light/al3010.c
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@ -17,6 +17,7 @@
#include <linux/bitfield.h> #include <linux/bitfield.h>
#include <linux/i2c.h> #include <linux/i2c.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/regmap.h>
#include <linux/mod_devicetable.h> #include <linux/mod_devicetable.h>
#include <linux/iio/iio.h> #include <linux/iio/iio.h>
@ -44,8 +45,14 @@ static const int al3010_scales[][2] = {
{0, 1187200}, {0, 296800}, {0, 74200}, {0, 18600} {0, 1187200}, {0, 296800}, {0, 74200}, {0, 18600}
}; };
static const struct regmap_config al3010_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = AL3010_REG_CONFIG,
};
struct al3010_data { struct al3010_data {
struct i2c_client *client; struct regmap *regmap;
}; };
static const struct iio_chan_spec al3010_channels[] = { static const struct iio_chan_spec al3010_channels[] = {
@ -67,41 +74,36 @@ static const struct attribute_group al3010_attribute_group = {
.attrs = al3010_attributes, .attrs = al3010_attributes,
}; };
static int al3010_set_pwr_on(struct i2c_client *client) static int al3010_set_pwr_on(struct al3010_data *data)
{ {
return i2c_smbus_write_byte_data(client, AL3010_REG_SYSTEM, return regmap_write(data->regmap, AL3010_REG_SYSTEM, AL3010_CONFIG_ENABLE);
AL3010_CONFIG_ENABLE);
} }
static void al3010_set_pwr_off(void *_data) static void al3010_set_pwr_off(void *_data)
{ {
struct al3010_data *data = _data; struct al3010_data *data = _data;
struct device *dev = regmap_get_device(data->regmap);
int ret;
i2c_smbus_write_byte_data(data->client, AL3010_REG_SYSTEM, ret = regmap_write(data->regmap, AL3010_REG_SYSTEM, AL3010_CONFIG_DISABLE);
AL3010_CONFIG_DISABLE); if (ret)
dev_err(dev, "failed to write system register\n");
} }
static int al3010_init(struct al3010_data *data) static int al3010_init(struct al3010_data *data)
{ {
struct device *dev = regmap_get_device(data->regmap);
int ret; int ret;
ret = al3010_set_pwr_on(data->client); ret = al3010_set_pwr_on(data);
if (ret < 0)
return ret;
ret = devm_add_action_or_reset(&data->client->dev,
al3010_set_pwr_off,
data);
if (ret) if (ret)
return ret; return ret;
ret = i2c_smbus_write_byte_data(data->client, AL3010_REG_CONFIG, ret = devm_add_action_or_reset(dev, al3010_set_pwr_off, data);
FIELD_PREP(AL3010_GAIN_MASK, if (ret)
AL3XXX_RANGE_3));
if (ret < 0)
return ret; return ret;
return regmap_write(data->regmap, AL3010_REG_CONFIG,
return 0; FIELD_PREP(AL3010_GAIN_MASK, AL3XXX_RANGE_3));
} }
static int al3010_read_raw(struct iio_dev *indio_dev, static int al3010_read_raw(struct iio_dev *indio_dev,
@ -109,7 +111,7 @@ static int al3010_read_raw(struct iio_dev *indio_dev,
int *val2, long mask) int *val2, long mask)
{ {
struct al3010_data *data = iio_priv(indio_dev); struct al3010_data *data = iio_priv(indio_dev);
int ret; int ret, gain, raw;
switch (mask) { switch (mask) {
case IIO_CHAN_INFO_RAW: case IIO_CHAN_INFO_RAW:
@ -118,21 +120,21 @@ static int al3010_read_raw(struct iio_dev *indio_dev,
* - low byte of output is stored at AL3010_REG_DATA_LOW * - low byte of output is stored at AL3010_REG_DATA_LOW
* - high byte of output is stored at AL3010_REG_DATA_LOW + 1 * - high byte of output is stored at AL3010_REG_DATA_LOW + 1
*/ */
ret = i2c_smbus_read_word_data(data->client, ret = regmap_read(data->regmap, AL3010_REG_DATA_LOW, &raw);
AL3010_REG_DATA_LOW); if (ret)
if (ret < 0)
return ret;
*val = ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
ret = i2c_smbus_read_byte_data(data->client,
AL3010_REG_CONFIG);
if (ret < 0)
return ret; return ret;
ret = FIELD_GET(AL3010_GAIN_MASK, ret); *val = raw;
*val = al3010_scales[ret][0];
*val2 = al3010_scales[ret][1]; return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
ret = regmap_read(data->regmap, AL3010_REG_CONFIG, &gain);
if (ret)
return ret;
gain = FIELD_GET(AL3010_GAIN_MASK, gain);
*val = al3010_scales[gain][0];
*val2 = al3010_scales[gain][1];
return IIO_VAL_INT_PLUS_MICRO; return IIO_VAL_INT_PLUS_MICRO;
} }
@ -153,9 +155,8 @@ static int al3010_write_raw(struct iio_dev *indio_dev,
val2 != al3010_scales[i][1]) val2 != al3010_scales[i][1])
continue; continue;
return i2c_smbus_write_byte_data(data->client, return regmap_write(data->regmap, AL3010_REG_CONFIG,
AL3010_REG_CONFIG, FIELD_PREP(AL3010_GAIN_MASK, i));
FIELD_PREP(AL3010_GAIN_MASK, i));
} }
break; break;
} }
@ -181,7 +182,10 @@ static int al3010_probe(struct i2c_client *client)
data = iio_priv(indio_dev); data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev); i2c_set_clientdata(client, indio_dev);
data->client = client; data->regmap = devm_regmap_init_i2c(client, &al3010_regmap_config);
if (IS_ERR(data->regmap))
return dev_err_probe(dev, PTR_ERR(data->regmap),
"cannot allocate regmap\n");
indio_dev->info = &al3010_info; indio_dev->info = &al3010_info;
indio_dev->name = "al3010"; indio_dev->name = "al3010";
@ -206,7 +210,9 @@ static int al3010_suspend(struct device *dev)
static int al3010_resume(struct device *dev) static int al3010_resume(struct device *dev)
{ {
return al3010_set_pwr_on(to_i2c_client(dev)); struct al3010_data *data = iio_priv(dev_get_drvdata(dev));
return al3010_set_pwr_on(data);
} }
static DEFINE_SIMPLE_DEV_PM_OPS(al3010_pm_ops, al3010_suspend, al3010_resume); static DEFINE_SIMPLE_DEV_PM_OPS(al3010_pm_ops, al3010_suspend, al3010_resume);