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334 lines
8.1 KiB
334 lines
8.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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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 <[email protected]> |
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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 const 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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.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->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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static int __maybe_unused 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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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 const struct of_device_id bh1750_of_match[] = { |
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{ .compatible = "rohm,bh1710", }, |
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{ .compatible = "rohm,bh1715", }, |
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{ .compatible = "rohm,bh1721", }, |
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{ .compatible = "rohm,bh1750", }, |
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{ .compatible = "rohm,bh1751", }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, bh1750_of_match); |
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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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.of_match_table = bh1750_of_match, |
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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 <[email protected]>"); |
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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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