373 lines
9.1 KiB
C
373 lines
9.1 KiB
C
/*
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* tcs3472.c - Support for TAOS TCS3472 color light-to-digital converter
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*
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* Copyright (c) 2013 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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* Color light sensor with 16-bit channels for red, green, blue, clear);
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* 7-bit I2C slave address 0x39 (TCS34721, TCS34723) or 0x29 (TCS34725,
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* TCS34727)
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*
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* TODO: interrupt support, thresholds, wait time
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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 TCS3472_DRV_NAME "tcs3472"
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#define TCS3472_COMMAND BIT(7)
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#define TCS3472_AUTO_INCR BIT(5)
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#define TCS3472_ENABLE (TCS3472_COMMAND | 0x00)
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#define TCS3472_ATIME (TCS3472_COMMAND | 0x01)
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#define TCS3472_WTIME (TCS3472_COMMAND | 0x03)
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#define TCS3472_AILT (TCS3472_COMMAND | 0x04)
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#define TCS3472_AIHT (TCS3472_COMMAND | 0x06)
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#define TCS3472_PERS (TCS3472_COMMAND | 0x0c)
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#define TCS3472_CONFIG (TCS3472_COMMAND | 0x0d)
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#define TCS3472_CONTROL (TCS3472_COMMAND | 0x0f)
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#define TCS3472_ID (TCS3472_COMMAND | 0x12)
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#define TCS3472_STATUS (TCS3472_COMMAND | 0x13)
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#define TCS3472_CDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x14)
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#define TCS3472_RDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x16)
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#define TCS3472_GDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x18)
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#define TCS3472_BDATA (TCS3472_COMMAND | TCS3472_AUTO_INCR | 0x1a)
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#define TCS3472_STATUS_AVALID BIT(0)
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#define TCS3472_ENABLE_AEN BIT(1)
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#define TCS3472_ENABLE_PON BIT(0)
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#define TCS3472_CONTROL_AGAIN_MASK (BIT(0) | BIT(1))
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struct tcs3472_data {
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struct i2c_client *client;
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u8 enable;
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u8 control;
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u8 atime;
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u16 buffer[8]; /* 4 16-bit channels + 64-bit timestamp */
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};
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#define TCS3472_CHANNEL(_color, _si, _addr) { \
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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_CALIBSCALE) | \
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BIT(IIO_CHAN_INFO_INT_TIME), \
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.channel2 = IIO_MOD_LIGHT_##_color, \
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.address = _addr, \
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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 int tcs3472_agains[] = { 1, 4, 16, 60 };
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static const struct iio_chan_spec tcs3472_channels[] = {
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TCS3472_CHANNEL(CLEAR, 0, TCS3472_CDATA),
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TCS3472_CHANNEL(RED, 1, TCS3472_RDATA),
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TCS3472_CHANNEL(GREEN, 2, TCS3472_GDATA),
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TCS3472_CHANNEL(BLUE, 3, TCS3472_BDATA),
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IIO_CHAN_SOFT_TIMESTAMP(4),
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};
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static int tcs3472_req_data(struct tcs3472_data *data)
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{
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int tries = 50;
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int ret;
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while (tries--) {
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ret = i2c_smbus_read_byte_data(data->client, TCS3472_STATUS);
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if (ret < 0)
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return ret;
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if (ret & TCS3472_STATUS_AVALID)
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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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return -EIO;
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}
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return 0;
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}
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static int tcs3472_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 tcs3472_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 = tcs3472_req_data(data);
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if (ret < 0)
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return ret;
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ret = i2c_smbus_read_word_data(data->client, chan->address);
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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_CALIBSCALE:
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*val = tcs3472_agains[data->control &
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TCS3472_CONTROL_AGAIN_MASK];
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_INT_TIME:
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*val = 0;
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*val2 = (256 - data->atime) * 2400;
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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 tcs3472_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 tcs3472_data *data = iio_priv(indio_dev);
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int i;
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switch (mask) {
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case IIO_CHAN_INFO_CALIBSCALE:
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if (val2 != 0)
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(tcs3472_agains); i++) {
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if (val == tcs3472_agains[i]) {
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data->control &= ~TCS3472_CONTROL_AGAIN_MASK;
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data->control |= i;
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return i2c_smbus_write_byte_data(
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data->client, TCS3472_CONTROL,
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data->control);
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}
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}
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return -EINVAL;
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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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for (i = 0; i < 256; i++) {
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if (val2 == (256 - i) * 2400) {
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data->atime = i;
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return i2c_smbus_write_word_data(
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data->client, TCS3472_ATIME,
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data->atime);
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}
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}
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return -EINVAL;
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}
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return -EINVAL;
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}
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static irqreturn_t tcs3472_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 tcs3472_data *data = iio_priv(indio_dev);
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int len = 0;
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int i, j = 0;
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int ret = tcs3472_req_data(data);
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if (ret < 0)
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goto done;
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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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ret = i2c_smbus_read_word_data(data->client,
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TCS3472_CDATA + 2*i);
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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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len += 2;
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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());
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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 ssize_t tcs3472_show_int_time_available(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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size_t len = 0;
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int i;
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for (i = 1; i <= 256; i++)
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len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06d ",
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2400 * i);
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/* replace trailing space by newline */
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buf[len - 1] = '\n';
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return len;
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}
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static IIO_CONST_ATTR(calibscale_available, "1 4 16 60");
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static IIO_DEV_ATTR_INT_TIME_AVAIL(tcs3472_show_int_time_available);
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static struct attribute *tcs3472_attributes[] = {
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&iio_const_attr_calibscale_available.dev_attr.attr,
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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 tcs3472_attribute_group = {
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.attrs = tcs3472_attributes,
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};
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static const struct iio_info tcs3472_info = {
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.read_raw = tcs3472_read_raw,
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.write_raw = tcs3472_write_raw,
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.attrs = &tcs3472_attribute_group,
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.driver_module = THIS_MODULE,
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};
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static int tcs3472_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct tcs3472_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 = &tcs3472_info;
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indio_dev->name = TCS3472_DRV_NAME;
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indio_dev->channels = tcs3472_channels;
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indio_dev->num_channels = ARRAY_SIZE(tcs3472_channels);
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = i2c_smbus_read_byte_data(data->client, TCS3472_ID);
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if (ret < 0)
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return ret;
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if (ret == 0x44)
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dev_info(&client->dev, "TCS34721/34725 found\n");
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else if (ret == 0x4d)
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dev_info(&client->dev, "TCS34723/34727 found\n");
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else
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return -ENODEV;
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ret = i2c_smbus_read_byte_data(data->client, TCS3472_CONTROL);
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if (ret < 0)
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return ret;
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data->control = ret;
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ret = i2c_smbus_read_byte_data(data->client, TCS3472_ATIME);
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if (ret < 0)
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return ret;
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data->atime = ret;
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ret = i2c_smbus_read_byte_data(data->client, TCS3472_ENABLE);
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if (ret < 0)
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return ret;
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/* enable device */
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data->enable = ret | TCS3472_ENABLE_PON | TCS3472_ENABLE_AEN;
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ret = i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,
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data->enable);
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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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tcs3472_trigger_handler, NULL);
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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 tcs3472_powerdown(struct tcs3472_data *data)
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{
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return i2c_smbus_write_byte_data(data->client, TCS3472_ENABLE,
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data->enable & ~(TCS3472_ENABLE_AEN | TCS3472_ENABLE_PON));
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}
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static int tcs3472_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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tcs3472_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 tcs3472_suspend(struct device *dev)
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{
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struct tcs3472_data *data = iio_priv(i2c_get_clientdata(
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to_i2c_client(dev)));
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return tcs3472_powerdown(data);
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}
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static int tcs3472_resume(struct device *dev)
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{
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struct tcs3472_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, TCS3472_ENABLE,
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data->enable | (TCS3472_ENABLE_AEN | TCS3472_ENABLE_PON));
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}
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#endif
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static SIMPLE_DEV_PM_OPS(tcs3472_pm_ops, tcs3472_suspend, tcs3472_resume);
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static const struct i2c_device_id tcs3472_id[] = {
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{ "tcs3472", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tcs3472_id);
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static struct i2c_driver tcs3472_driver = {
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.driver = {
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.name = TCS3472_DRV_NAME,
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.pm = &tcs3472_pm_ops,
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.owner = THIS_MODULE,
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},
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.probe = tcs3472_probe,
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.remove = tcs3472_remove,
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.id_table = tcs3472_id,
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};
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module_i2c_driver(tcs3472_driver);
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MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
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MODULE_DESCRIPTION("TCS3472 color light sensors driver");
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MODULE_LICENSE("GPL");
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