diff options
Diffstat (limited to 'drivers/iio/light/bh1750.c')
| -rw-r--r-- | drivers/iio/light/bh1750.c | 38 |
1 files changed, 30 insertions, 8 deletions
diff --git a/drivers/iio/light/bh1750.c b/drivers/iio/light/bh1750.c index 48484b9401b9..764f88826fcb 100644 --- a/drivers/iio/light/bh1750.c +++ b/drivers/iio/light/bh1750.c @@ -22,12 +22,16 @@ #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/module.h> +#include <linux/gpio/consumer.h> #define BH1750_POWER_DOWN 0x00 #define BH1750_ONE_TIME_H_RES_MODE 0x20 /* auto-mode for BH1721 */ #define BH1750_CHANGE_INT_TIME_H_BIT 0x40 #define BH1750_CHANGE_INT_TIME_L_BIT 0x60 +/* Define the reset delay time in microseconds */ +#define BH1750_RESET_DELAY_US 10000 /* 10ms */ + enum { BH1710, BH1721, @@ -40,6 +44,7 @@ struct bh1750_data { struct mutex lock; const struct bh1750_chip_info *chip_info; u16 mtreg; + struct gpio_desc *reset_gpio; }; struct bh1750_chip_info { @@ -228,9 +233,9 @@ static const struct iio_chan_spec bh1750_channels[] = { } }; -static int bh1750_probe(struct i2c_client *client, - const struct i2c_device_id *id) +static int bh1750_probe(struct i2c_client *client) { + const struct i2c_device_id *id = i2c_client_get_device_id(client); int ret, usec; struct bh1750_data *data; struct iio_dev *indio_dev; @@ -248,6 +253,25 @@ static int bh1750_probe(struct i2c_client *client, data->client = client; data->chip_info = &bh1750_chip_info_tbl[id->driver_data]; + /* Get reset GPIO from device tree */ + data->reset_gpio = devm_gpiod_get_optional(&client->dev, + "reset", GPIOD_OUT_HIGH); + + if (IS_ERR(data->reset_gpio)) + return dev_err_probe(&client->dev, PTR_ERR(data->reset_gpio), + "Failed to get reset GPIO\n"); + + /* Perform hardware reset if GPIO is provided */ + if (data->reset_gpio) { + /* Perform reset sequence: low-high */ + gpiod_set_value_cansleep(data->reset_gpio, 1); + fsleep(BH1750_RESET_DELAY_US); + gpiod_set_value_cansleep(data->reset_gpio, 0); + fsleep(BH1750_RESET_DELAY_US); + + dev_dbg(&client->dev, "BH1750 reset completed via GPIO\n"); + } + usec = data->chip_info->mtreg_to_usec * data->chip_info->mtreg_default; ret = bh1750_change_int_time(data, usec); if (ret < 0) @@ -263,7 +287,7 @@ static int bh1750_probe(struct i2c_client *client, return iio_device_register(indio_dev); } -static int bh1750_remove(struct i2c_client *client) +static void bh1750_remove(struct i2c_client *client) { struct iio_dev *indio_dev = i2c_get_clientdata(client); struct bh1750_data *data = iio_priv(indio_dev); @@ -273,11 +297,9 @@ static int bh1750_remove(struct i2c_client *client) mutex_lock(&data->lock); i2c_smbus_write_byte(client, BH1750_POWER_DOWN); mutex_unlock(&data->lock); - - return 0; } -static int __maybe_unused bh1750_suspend(struct device *dev) +static int bh1750_suspend(struct device *dev) { int ret; struct bh1750_data *data = @@ -294,7 +316,7 @@ static int __maybe_unused bh1750_suspend(struct device *dev) return ret; } -static SIMPLE_DEV_PM_OPS(bh1750_pm_ops, bh1750_suspend, NULL); +static DEFINE_SIMPLE_DEV_PM_OPS(bh1750_pm_ops, bh1750_suspend, NULL); static const struct i2c_device_id bh1750_id[] = { { "bh1710", BH1710 }, @@ -320,7 +342,7 @@ static struct i2c_driver bh1750_driver = { .driver = { .name = "bh1750", .of_match_table = bh1750_of_match, - .pm = &bh1750_pm_ops, + .pm = pm_sleep_ptr(&bh1750_pm_ops), }, .probe = bh1750_probe, .remove = bh1750_remove, |