diff options
Diffstat (limited to 'drivers/iio/light/bh1750.c')
| -rw-r--r-- | drivers/iio/light/bh1750.c | 63 |
1 files changed, 43 insertions, 20 deletions
diff --git a/drivers/iio/light/bh1750.c b/drivers/iio/light/bh1750.c index 6c61187e630f..764f88826fcb 100644 --- a/drivers/iio/light/bh1750.c +++ b/drivers/iio/light/bh1750.c @@ -1,12 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0 /* * ROHM BH1710/BH1715/BH1721/BH1750/BH1751 ambient light sensor driver * * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com> * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * * Data sheets: * http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1710fvc-e.pdf * http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1715fvc-e.pdf @@ -25,12 +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, @@ -43,6 +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 { @@ -62,9 +64,9 @@ struct bh1750_chip_info { u16 int_time_low_mask; u16 int_time_high_mask; -} +}; -static const bh1750_chip_info_tbl[] = { +static const struct bh1750_chip_info bh1750_chip_info_tbl[] = { [BH1710] = { 140, 1022, 300, 400, 250000000, 2, 0x001F, 0x03E0 }, [BH1721] = { 140, 1020, 300, 400, 250000000, 2, 0x0010, 0x03E0 }, [BH1750] = { 31, 254, 69, 1740, 57500000, 1, 0x001F, 0x00E0 }, @@ -217,7 +219,6 @@ static const struct attribute_group bh1750_attribute_group = { }; static const struct iio_info bh1750_info = { - .driver_module = THIS_MODULE, .attrs = &bh1750_attribute_group, .read_raw = bh1750_read_raw, .write_raw = bh1750_write_raw, @@ -232,9 +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; @@ -252,13 +253,31 @@ 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) return ret; mutex_init(&data->lock); - indio_dev->dev.parent = &client->dev; indio_dev->info = &bh1750_info; indio_dev->name = id->name; indio_dev->channels = bh1750_channels; @@ -268,7 +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); @@ -278,11 +297,8 @@ 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; } -#ifdef CONFIG_PM_SLEEP static int bh1750_suspend(struct device *dev) { int ret; @@ -300,11 +316,7 @@ static int bh1750_suspend(struct device *dev) return ret; } -static SIMPLE_DEV_PM_OPS(bh1750_pm_ops, bh1750_suspend, NULL); -#define BH1750_PM_OPS (&bh1750_pm_ops) -#else -#define BH1750_PM_OPS NULL -#endif +static DEFINE_SIMPLE_DEV_PM_OPS(bh1750_pm_ops, bh1750_suspend, NULL); static const struct i2c_device_id bh1750_id[] = { { "bh1710", BH1710 }, @@ -316,10 +328,21 @@ static const struct i2c_device_id bh1750_id[] = { }; MODULE_DEVICE_TABLE(i2c, bh1750_id); +static const struct of_device_id bh1750_of_match[] = { + { .compatible = "rohm,bh1710", }, + { .compatible = "rohm,bh1715", }, + { .compatible = "rohm,bh1721", }, + { .compatible = "rohm,bh1750", }, + { .compatible = "rohm,bh1751", }, + { } +}; +MODULE_DEVICE_TABLE(of, bh1750_of_match); + static struct i2c_driver bh1750_driver = { .driver = { .name = "bh1750", - .pm = BH1750_PM_OPS, + .of_match_table = bh1750_of_match, + .pm = pm_sleep_ptr(&bh1750_pm_ops), }, .probe = bh1750_probe, .remove = bh1750_remove, |