359 lines
8.6 KiB
C
359 lines
8.6 KiB
C
/*
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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 <pmeerw@pmeerw.net>
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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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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u16 buffer[8]; /* 3x 16-bit, padding, 8 bytes timestamp */
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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->buffer[j++] = ret;
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}
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iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
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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_preenable(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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int ret;
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ret = iio_triggered_buffer_predisable(indio_dev);
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if (ret < 0)
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return ret;
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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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.preenable = isl29125_buffer_preenable,
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.postenable = &iio_triggered_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->dev.parent = &client->dev;
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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 <pmeerw@pmeerw.net>");
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MODULE_DESCRIPTION("ISL29125 RGB light sensor driver");
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MODULE_LICENSE("GPL");
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