334 lines
8.1 KiB
C
334 lines
8.1 KiB
C
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/*
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* ROHM BH1710/BH1715/BH1721/BH1750/BH1751 ambient light sensor driver
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*
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* Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Data sheets:
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* http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1710fvc-e.pdf
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* http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1715fvc-e.pdf
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* http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1721fvc-e.pdf
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* http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1750fvi-e.pdf
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* http://rohmfs.rohm.com/en/products/databook/datasheet/ic/sensor/light/bh1751fvi-e.pdf
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*
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* 7-bit I2C slave addresses:
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* 0x23 (ADDR pin low)
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* 0x5C (ADDR pin high)
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*
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*/
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/module.h>
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#define BH1750_POWER_DOWN 0x00
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#define BH1750_ONE_TIME_H_RES_MODE 0x20 /* auto-mode for BH1721 */
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#define BH1750_CHANGE_INT_TIME_H_BIT 0x40
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#define BH1750_CHANGE_INT_TIME_L_BIT 0x60
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enum {
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BH1710,
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BH1721,
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BH1750,
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};
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struct bh1750_chip_info;
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struct bh1750_data {
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struct i2c_client *client;
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struct mutex lock;
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const struct bh1750_chip_info *chip_info;
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u16 mtreg;
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};
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struct bh1750_chip_info {
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u16 mtreg_min;
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u16 mtreg_max;
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u16 mtreg_default;
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int mtreg_to_usec;
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int mtreg_to_scale;
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/*
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* For BH1710/BH1721 all possible integration time values won't fit
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* into one page so displaying is limited to every second one.
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* Note, that user can still write proper values which were not
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* listed.
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*/
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int inc;
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u16 int_time_low_mask;
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u16 int_time_high_mask;
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};
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static const struct bh1750_chip_info bh1750_chip_info_tbl[] = {
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[BH1710] = { 140, 1022, 300, 400, 250000000, 2, 0x001F, 0x03E0 },
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[BH1721] = { 140, 1020, 300, 400, 250000000, 2, 0x0010, 0x03E0 },
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[BH1750] = { 31, 254, 69, 1740, 57500000, 1, 0x001F, 0x00E0 },
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};
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static int bh1750_change_int_time(struct bh1750_data *data, int usec)
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{
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int ret;
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u16 val;
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u8 regval;
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const struct bh1750_chip_info *chip_info = data->chip_info;
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if ((usec % chip_info->mtreg_to_usec) != 0)
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return -EINVAL;
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val = usec / chip_info->mtreg_to_usec;
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if (val < chip_info->mtreg_min || val > chip_info->mtreg_max)
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return -EINVAL;
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ret = i2c_smbus_write_byte(data->client, BH1750_POWER_DOWN);
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if (ret < 0)
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return ret;
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regval = (val & chip_info->int_time_high_mask) >> 5;
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ret = i2c_smbus_write_byte(data->client,
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BH1750_CHANGE_INT_TIME_H_BIT | regval);
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if (ret < 0)
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return ret;
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regval = val & chip_info->int_time_low_mask;
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ret = i2c_smbus_write_byte(data->client,
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BH1750_CHANGE_INT_TIME_L_BIT | regval);
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if (ret < 0)
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return ret;
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data->mtreg = val;
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return 0;
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}
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static int bh1750_read(struct bh1750_data *data, int *val)
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{
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int ret;
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__be16 result;
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const struct bh1750_chip_info *chip_info = data->chip_info;
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unsigned long delay = chip_info->mtreg_to_usec * data->mtreg;
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/*
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* BH1721 will enter continuous mode on receiving this command.
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* Note, that this eliminates need for bh1750_resume().
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*/
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ret = i2c_smbus_write_byte(data->client, BH1750_ONE_TIME_H_RES_MODE);
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if (ret < 0)
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return ret;
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usleep_range(delay + 15000, delay + 40000);
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ret = i2c_master_recv(data->client, (char *)&result, 2);
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if (ret < 0)
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return ret;
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*val = be16_to_cpu(result);
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return 0;
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}
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static int bh1750_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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int ret, tmp;
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struct bh1750_data *data = iio_priv(indio_dev);
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const struct bh1750_chip_info *chip_info = data->chip_info;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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switch (chan->type) {
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case IIO_LIGHT:
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mutex_lock(&data->lock);
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ret = bh1750_read(data, val);
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mutex_unlock(&data->lock);
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if (ret < 0)
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return ret;
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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case IIO_CHAN_INFO_SCALE:
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tmp = chip_info->mtreg_to_scale / data->mtreg;
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*val = tmp / 1000000;
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*val2 = tmp % 1000000;
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_CHAN_INFO_INT_TIME:
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*val = 0;
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*val2 = chip_info->mtreg_to_usec * data->mtreg;
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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}
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}
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static int bh1750_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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int ret;
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struct bh1750_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_INT_TIME:
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if (val != 0)
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return -EINVAL;
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mutex_lock(&data->lock);
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ret = bh1750_change_int_time(data, val2);
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mutex_unlock(&data->lock);
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return ret;
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default:
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return -EINVAL;
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}
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}
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static ssize_t bh1750_show_int_time_available(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int i;
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size_t len = 0;
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struct bh1750_data *data = iio_priv(dev_to_iio_dev(dev));
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const struct bh1750_chip_info *chip_info = data->chip_info;
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for (i = chip_info->mtreg_min; i <= chip_info->mtreg_max; i += chip_info->inc)
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len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06d ",
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chip_info->mtreg_to_usec * i);
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buf[len - 1] = '\n';
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return len;
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}
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static IIO_DEV_ATTR_INT_TIME_AVAIL(bh1750_show_int_time_available);
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static struct attribute *bh1750_attributes[] = {
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&iio_dev_attr_integration_time_available.dev_attr.attr,
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NULL,
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};
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static struct attribute_group bh1750_attribute_group = {
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.attrs = bh1750_attributes,
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};
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static const struct iio_info bh1750_info = {
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.driver_module = THIS_MODULE,
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.attrs = &bh1750_attribute_group,
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.read_raw = bh1750_read_raw,
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.write_raw = bh1750_write_raw,
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};
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static const struct iio_chan_spec bh1750_channels[] = {
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{
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.type = IIO_LIGHT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_INT_TIME)
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}
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};
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static int bh1750_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int ret, usec;
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struct bh1750_data *data;
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struct iio_dev *indio_dev;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
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I2C_FUNC_SMBUS_WRITE_BYTE))
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return -EOPNOTSUPP;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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data->chip_info = &bh1750_chip_info_tbl[id->driver_data];
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usec = data->chip_info->mtreg_to_usec * data->chip_info->mtreg_default;
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ret = bh1750_change_int_time(data, usec);
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if (ret < 0)
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return ret;
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mutex_init(&data->lock);
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indio_dev->dev.parent = &client->dev;
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indio_dev->info = &bh1750_info;
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indio_dev->name = id->name;
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indio_dev->channels = bh1750_channels;
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indio_dev->num_channels = ARRAY_SIZE(bh1750_channels);
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indio_dev->modes = INDIO_DIRECT_MODE;
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return iio_device_register(indio_dev);
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}
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static int bh1750_remove(struct i2c_client *client)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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struct bh1750_data *data = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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mutex_lock(&data->lock);
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i2c_smbus_write_byte(client, BH1750_POWER_DOWN);
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mutex_unlock(&data->lock);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int bh1750_suspend(struct device *dev)
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{
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int ret;
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struct bh1750_data *data =
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iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
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/*
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* This is mainly for BH1721 which doesn't enter power down
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* mode automatically.
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*/
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mutex_lock(&data->lock);
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ret = i2c_smbus_write_byte(data->client, BH1750_POWER_DOWN);
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mutex_unlock(&data->lock);
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return ret;
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}
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static SIMPLE_DEV_PM_OPS(bh1750_pm_ops, bh1750_suspend, NULL);
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#define BH1750_PM_OPS (&bh1750_pm_ops)
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#else
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#define BH1750_PM_OPS NULL
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#endif
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static const struct i2c_device_id bh1750_id[] = {
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{ "bh1710", BH1710 },
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{ "bh1715", BH1750 },
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{ "bh1721", BH1721 },
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{ "bh1750", BH1750 },
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{ "bh1751", BH1750 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, bh1750_id);
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static struct i2c_driver bh1750_driver = {
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.driver = {
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.name = "bh1750",
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.pm = BH1750_PM_OPS,
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},
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.probe = bh1750_probe,
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.remove = bh1750_remove,
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.id_table = bh1750_id,
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};
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module_i2c_driver(bh1750_driver);
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MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
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MODULE_DESCRIPTION("ROHM BH1710/BH1715/BH1721/BH1750/BH1751 als driver");
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MODULE_LICENSE("GPL v2");
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