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352 lines
8.4 KiB
352 lines
8.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* isl29125.c - Support for Intersil ISL29125 RGB light sensor |
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* |
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* Copyright (c) 2014 Peter Meerwald <[email protected]> |
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* |
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* RGB light sensor with 16-bit channels for red, green, blue); |
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* 7-bit I2C slave address 0x44 |
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* |
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* TODO: interrupt support, IR compensation, thresholds, 12bit |
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*/ |
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#include <linux/module.h> |
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#include <linux/i2c.h> |
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#include <linux/delay.h> |
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#include <linux/pm.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/iio/trigger_consumer.h> |
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#include <linux/iio/buffer.h> |
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#include <linux/iio/triggered_buffer.h> |
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#define ISL29125_DRV_NAME "isl29125" |
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#define ISL29125_DEVICE_ID 0x00 |
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#define ISL29125_CONF1 0x01 |
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#define ISL29125_CONF2 0x02 |
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#define ISL29125_CONF3 0x03 |
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#define ISL29125_STATUS 0x08 |
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#define ISL29125_GREEN_DATA 0x09 |
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#define ISL29125_RED_DATA 0x0b |
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#define ISL29125_BLUE_DATA 0x0d |
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#define ISL29125_ID 0x7d |
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#define ISL29125_MODE_MASK GENMASK(2, 0) |
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#define ISL29125_MODE_PD 0x0 |
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#define ISL29125_MODE_G 0x1 |
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#define ISL29125_MODE_R 0x2 |
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#define ISL29125_MODE_B 0x3 |
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#define ISL29125_MODE_RGB 0x5 |
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#define ISL29125_SENSING_RANGE_0 5722 /* 375 lux full range */ |
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#define ISL29125_SENSING_RANGE_1 152590 /* 10k lux full range */ |
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#define ISL29125_MODE_RANGE BIT(3) |
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#define ISL29125_STATUS_CONV BIT(1) |
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struct isl29125_data { |
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struct i2c_client *client; |
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u8 conf1; |
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/* Ensure timestamp is naturally aligned */ |
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struct { |
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u16 chans[3]; |
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s64 timestamp __aligned(8); |
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} scan; |
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}; |
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#define ISL29125_CHANNEL(_color, _si) { \ |
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.type = IIO_INTENSITY, \ |
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.modified = 1, \ |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ |
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.channel2 = IIO_MOD_LIGHT_##_color, \ |
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.scan_index = _si, \ |
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.scan_type = { \ |
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.sign = 'u', \ |
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.realbits = 16, \ |
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.storagebits = 16, \ |
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.endianness = IIO_CPU, \ |
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}, \ |
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} |
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static const struct iio_chan_spec isl29125_channels[] = { |
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ISL29125_CHANNEL(GREEN, 0), |
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ISL29125_CHANNEL(RED, 1), |
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ISL29125_CHANNEL(BLUE, 2), |
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IIO_CHAN_SOFT_TIMESTAMP(3), |
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}; |
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static const struct { |
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u8 mode, data; |
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} isl29125_regs[] = { |
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{ISL29125_MODE_G, ISL29125_GREEN_DATA}, |
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{ISL29125_MODE_R, ISL29125_RED_DATA}, |
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{ISL29125_MODE_B, ISL29125_BLUE_DATA}, |
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}; |
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static int isl29125_read_data(struct isl29125_data *data, int si) |
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{ |
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int tries = 5; |
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int ret; |
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ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
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data->conf1 | isl29125_regs[si].mode); |
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if (ret < 0) |
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return ret; |
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msleep(101); |
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while (tries--) { |
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ret = i2c_smbus_read_byte_data(data->client, ISL29125_STATUS); |
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if (ret < 0) |
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goto fail; |
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if (ret & ISL29125_STATUS_CONV) |
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break; |
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msleep(20); |
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} |
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if (tries < 0) { |
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dev_err(&data->client->dev, "data not ready\n"); |
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ret = -EIO; |
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goto fail; |
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} |
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ret = i2c_smbus_read_word_data(data->client, isl29125_regs[si].data); |
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fail: |
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i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, data->conf1); |
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return ret; |
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} |
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static int isl29125_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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struct isl29125_data *data = iio_priv(indio_dev); |
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int ret; |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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ret = iio_device_claim_direct_mode(indio_dev); |
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if (ret) |
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return ret; |
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ret = isl29125_read_data(data, chan->scan_index); |
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iio_device_release_direct_mode(indio_dev); |
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if (ret < 0) |
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return ret; |
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*val = ret; |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_SCALE: |
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*val = 0; |
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if (data->conf1 & ISL29125_MODE_RANGE) |
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*val2 = ISL29125_SENSING_RANGE_1; /*10k lux full range*/ |
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else |
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*val2 = ISL29125_SENSING_RANGE_0; /*375 lux full range*/ |
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return IIO_VAL_INT_PLUS_MICRO; |
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} |
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return -EINVAL; |
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} |
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static int isl29125_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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struct isl29125_data *data = iio_priv(indio_dev); |
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switch (mask) { |
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case IIO_CHAN_INFO_SCALE: |
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if (val != 0) |
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return -EINVAL; |
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if (val2 == ISL29125_SENSING_RANGE_1) |
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data->conf1 |= ISL29125_MODE_RANGE; |
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else if (val2 == ISL29125_SENSING_RANGE_0) |
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data->conf1 &= ~ISL29125_MODE_RANGE; |
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else |
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return -EINVAL; |
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return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
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data->conf1); |
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default: |
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return -EINVAL; |
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} |
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} |
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static irqreturn_t isl29125_trigger_handler(int irq, void *p) |
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{ |
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struct iio_poll_func *pf = p; |
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struct iio_dev *indio_dev = pf->indio_dev; |
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struct isl29125_data *data = iio_priv(indio_dev); |
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int i, j = 0; |
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for_each_set_bit(i, indio_dev->active_scan_mask, |
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indio_dev->masklength) { |
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int ret = i2c_smbus_read_word_data(data->client, |
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isl29125_regs[i].data); |
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if (ret < 0) |
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goto done; |
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data->scan.chans[j++] = ret; |
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} |
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iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, |
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iio_get_time_ns(indio_dev)); |
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done: |
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iio_trigger_notify_done(indio_dev->trig); |
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return IRQ_HANDLED; |
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} |
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static IIO_CONST_ATTR(scale_available, "0.005722 0.152590"); |
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static struct attribute *isl29125_attributes[] = { |
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&iio_const_attr_scale_available.dev_attr.attr, |
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NULL |
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}; |
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static const struct attribute_group isl29125_attribute_group = { |
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.attrs = isl29125_attributes, |
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}; |
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static const struct iio_info isl29125_info = { |
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.read_raw = isl29125_read_raw, |
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.write_raw = isl29125_write_raw, |
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.attrs = &isl29125_attribute_group, |
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}; |
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static int isl29125_buffer_postenable(struct iio_dev *indio_dev) |
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{ |
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struct isl29125_data *data = iio_priv(indio_dev); |
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data->conf1 |= ISL29125_MODE_RGB; |
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return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
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data->conf1); |
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} |
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static int isl29125_buffer_predisable(struct iio_dev *indio_dev) |
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{ |
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struct isl29125_data *data = iio_priv(indio_dev); |
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data->conf1 &= ~ISL29125_MODE_MASK; |
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data->conf1 |= ISL29125_MODE_PD; |
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return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
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data->conf1); |
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} |
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static const struct iio_buffer_setup_ops isl29125_buffer_setup_ops = { |
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.postenable = isl29125_buffer_postenable, |
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.predisable = isl29125_buffer_predisable, |
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}; |
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static int isl29125_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct isl29125_data *data; |
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struct iio_dev *indio_dev; |
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int ret; |
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
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if (indio_dev == NULL) |
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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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indio_dev->info = &isl29125_info; |
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indio_dev->name = ISL29125_DRV_NAME; |
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indio_dev->channels = isl29125_channels; |
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indio_dev->num_channels = ARRAY_SIZE(isl29125_channels); |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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ret = i2c_smbus_read_byte_data(data->client, ISL29125_DEVICE_ID); |
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if (ret < 0) |
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return ret; |
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if (ret != ISL29125_ID) |
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return -ENODEV; |
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data->conf1 = ISL29125_MODE_PD | ISL29125_MODE_RANGE; |
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ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
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data->conf1); |
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if (ret < 0) |
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return ret; |
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ret = i2c_smbus_write_byte_data(data->client, ISL29125_STATUS, 0); |
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if (ret < 0) |
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return ret; |
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ret = iio_triggered_buffer_setup(indio_dev, NULL, |
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isl29125_trigger_handler, &isl29125_buffer_setup_ops); |
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if (ret < 0) |
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return ret; |
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ret = iio_device_register(indio_dev); |
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if (ret < 0) |
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goto buffer_cleanup; |
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return 0; |
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buffer_cleanup: |
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iio_triggered_buffer_cleanup(indio_dev); |
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return ret; |
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} |
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static int isl29125_powerdown(struct isl29125_data *data) |
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{ |
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return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
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(data->conf1 & ~ISL29125_MODE_MASK) | ISL29125_MODE_PD); |
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} |
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static int isl29125_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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iio_device_unregister(indio_dev); |
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iio_triggered_buffer_cleanup(indio_dev); |
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isl29125_powerdown(iio_priv(indio_dev)); |
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return 0; |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int isl29125_suspend(struct device *dev) |
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{ |
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struct isl29125_data *data = iio_priv(i2c_get_clientdata( |
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to_i2c_client(dev))); |
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return isl29125_powerdown(data); |
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} |
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static int isl29125_resume(struct device *dev) |
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{ |
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struct isl29125_data *data = iio_priv(i2c_get_clientdata( |
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to_i2c_client(dev))); |
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return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, |
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data->conf1); |
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} |
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#endif |
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static SIMPLE_DEV_PM_OPS(isl29125_pm_ops, isl29125_suspend, isl29125_resume); |
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static const struct i2c_device_id isl29125_id[] = { |
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{ "isl29125", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, isl29125_id); |
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static struct i2c_driver isl29125_driver = { |
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.driver = { |
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.name = ISL29125_DRV_NAME, |
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.pm = &isl29125_pm_ops, |
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}, |
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.probe = isl29125_probe, |
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.remove = isl29125_remove, |
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.id_table = isl29125_id, |
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}; |
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module_i2c_driver(isl29125_driver); |
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MODULE_AUTHOR("Peter Meerwald <[email protected]>"); |
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MODULE_DESCRIPTION("ISL29125 RGB light sensor driver"); |
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MODULE_LICENSE("GPL");
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