405 lines
10 KiB
C
405 lines
10 KiB
C
/*
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* tcs3414.c - Support for TAOS TCS3414 digital color 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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* Digital color sensor with 16-bit channels for red, green, blue, clear);
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* 7-bit I2C slave address 0x39 (TCS3414) or 0x29, 0x49, 0x59 (TCS3413,
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* TCS3415, TCS3416, resp.)
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*
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* TODO: sync, interrupt support, thresholds, prescaler
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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 TCS3414_DRV_NAME "tcs3414"
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#define TCS3414_COMMAND BIT(7)
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#define TCS3414_COMMAND_WORD (TCS3414_COMMAND | BIT(5))
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#define TCS3414_CONTROL (TCS3414_COMMAND | 0x00)
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#define TCS3414_TIMING (TCS3414_COMMAND | 0x01)
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#define TCS3414_ID (TCS3414_COMMAND | 0x04)
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#define TCS3414_GAIN (TCS3414_COMMAND | 0x07)
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#define TCS3414_DATA_GREEN (TCS3414_COMMAND_WORD | 0x10)
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#define TCS3414_DATA_RED (TCS3414_COMMAND_WORD | 0x12)
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#define TCS3414_DATA_BLUE (TCS3414_COMMAND_WORD | 0x14)
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#define TCS3414_DATA_CLEAR (TCS3414_COMMAND_WORD | 0x16)
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#define TCS3414_CONTROL_ADC_VALID BIT(4)
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#define TCS3414_CONTROL_ADC_EN BIT(1)
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#define TCS3414_CONTROL_POWER BIT(0)
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#define TCS3414_INTEG_MASK GENMASK(1, 0)
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#define TCS3414_INTEG_12MS 0x0
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#define TCS3414_INTEG_100MS 0x1
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#define TCS3414_INTEG_400MS 0x2
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#define TCS3414_GAIN_MASK GENMASK(5, 4)
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#define TCS3414_GAIN_SHIFT 4
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struct tcs3414_data {
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struct i2c_client *client;
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struct mutex lock;
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u8 control;
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u8 gain;
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u8 timing;
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u16 buffer[8]; /* 4x 16-bit + 8 bytes timestamp */
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};
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#define TCS3414_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_SCALE) | \
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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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/* scale factors: 1/gain */
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static const int tcs3414_scales[][2] = {
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{1, 0}, {0, 250000}, {0, 62500}, {0, 15625}
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};
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/* integration time in ms */
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static const int tcs3414_times[] = { 12, 100, 400 };
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static const struct iio_chan_spec tcs3414_channels[] = {
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TCS3414_CHANNEL(GREEN, 0, TCS3414_DATA_GREEN),
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TCS3414_CHANNEL(RED, 1, TCS3414_DATA_RED),
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TCS3414_CHANNEL(BLUE, 2, TCS3414_DATA_BLUE),
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TCS3414_CHANNEL(CLEAR, 3, TCS3414_DATA_CLEAR),
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IIO_CHAN_SOFT_TIMESTAMP(4),
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};
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static int tcs3414_req_data(struct tcs3414_data *data)
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{
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int tries = 25;
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int ret;
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ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
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data->control | TCS3414_CONTROL_ADC_EN);
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if (ret < 0)
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return ret;
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while (tries--) {
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ret = i2c_smbus_read_byte_data(data->client, TCS3414_CONTROL);
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if (ret < 0)
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return ret;
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if (ret & TCS3414_CONTROL_ADC_VALID)
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break;
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msleep(20);
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}
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ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
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data->control);
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if (ret < 0)
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return ret;
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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 tcs3414_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 tcs3414_data *data = iio_priv(indio_dev);
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int i, ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (iio_buffer_enabled(indio_dev))
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return -EBUSY;
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mutex_lock(&data->lock);
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ret = tcs3414_req_data(data);
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if (ret < 0) {
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mutex_unlock(&data->lock);
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return ret;
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}
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ret = i2c_smbus_read_word_data(data->client, chan->address);
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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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*val = ret;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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i = (data->gain & TCS3414_GAIN_MASK) >> TCS3414_GAIN_SHIFT;
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*val = tcs3414_scales[i][0];
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*val2 = tcs3414_scales[i][1];
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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 = tcs3414_times[data->timing & TCS3414_INTEG_MASK] * 1000;
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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 tcs3414_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 tcs3414_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_SCALE:
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for (i = 0; i < ARRAY_SIZE(tcs3414_scales); i++) {
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if (val == tcs3414_scales[i][0] &&
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val2 == tcs3414_scales[i][1]) {
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data->gain &= ~TCS3414_GAIN_MASK;
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data->gain |= i << TCS3414_GAIN_SHIFT;
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return i2c_smbus_write_byte_data(
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data->client, TCS3414_GAIN,
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data->gain);
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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 < ARRAY_SIZE(tcs3414_times); i++) {
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if (val2 == tcs3414_times[i] * 1000) {
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data->timing &= ~TCS3414_INTEG_MASK;
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data->timing |= i;
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return i2c_smbus_write_byte_data(
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data->client, TCS3414_TIMING,
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data->timing);
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}
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}
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return -EINVAL;
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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 tcs3414_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 tcs3414_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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TCS3414_DATA_GREEN + 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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}
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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 IIO_CONST_ATTR(scale_available, "1 0.25 0.0625 0.015625");
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static IIO_CONST_ATTR_INT_TIME_AVAIL("0.012 0.1 0.4");
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static struct attribute *tcs3414_attributes[] = {
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&iio_const_attr_scale_available.dev_attr.attr,
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&iio_const_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 tcs3414_attribute_group = {
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.attrs = tcs3414_attributes,
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};
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static const struct iio_info tcs3414_info = {
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.read_raw = tcs3414_read_raw,
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.write_raw = tcs3414_write_raw,
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.attrs = &tcs3414_attribute_group,
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.driver_module = THIS_MODULE,
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};
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static int tcs3414_buffer_preenable(struct iio_dev *indio_dev)
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{
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struct tcs3414_data *data = iio_priv(indio_dev);
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data->control |= TCS3414_CONTROL_ADC_EN;
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return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
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data->control);
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}
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static int tcs3414_buffer_predisable(struct iio_dev *indio_dev)
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{
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struct tcs3414_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->control &= ~TCS3414_CONTROL_ADC_EN;
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return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
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data->control);
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}
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static const struct iio_buffer_setup_ops tcs3414_buffer_setup_ops = {
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.preenable = tcs3414_buffer_preenable,
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.postenable = &iio_triggered_buffer_postenable,
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.predisable = tcs3414_buffer_predisable,
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};
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static int tcs3414_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct tcs3414_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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mutex_init(&data->lock);
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indio_dev->dev.parent = &client->dev;
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indio_dev->info = &tcs3414_info;
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indio_dev->name = TCS3414_DRV_NAME;
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indio_dev->channels = tcs3414_channels;
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indio_dev->num_channels = ARRAY_SIZE(tcs3414_channels);
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = i2c_smbus_read_byte_data(data->client, TCS3414_ID);
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if (ret < 0)
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return ret;
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switch (ret & 0xf0) {
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case 0x00:
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dev_info(&client->dev, "TCS3404 found\n");
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break;
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case 0x10:
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dev_info(&client->dev, "TCS3413/14/15/16 found\n");
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break;
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default:
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return -ENODEV;
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}
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data->control = TCS3414_CONTROL_POWER;
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ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
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data->control);
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if (ret < 0)
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return ret;
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data->timing = TCS3414_INTEG_12MS; /* free running */
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ret = i2c_smbus_write_byte_data(data->client, TCS3414_TIMING,
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data->timing);
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if (ret < 0)
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return ret;
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ret = i2c_smbus_read_byte_data(data->client, TCS3414_GAIN);
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if (ret < 0)
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return ret;
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data->gain = ret;
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ret = iio_triggered_buffer_setup(indio_dev, NULL,
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tcs3414_trigger_handler, &tcs3414_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 tcs3414_powerdown(struct tcs3414_data *data)
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{
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return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
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data->control & ~(TCS3414_CONTROL_POWER |
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TCS3414_CONTROL_ADC_EN));
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}
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static int tcs3414_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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tcs3414_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 tcs3414_suspend(struct device *dev)
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{
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struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
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to_i2c_client(dev)));
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return tcs3414_powerdown(data);
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}
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static int tcs3414_resume(struct device *dev)
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{
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struct tcs3414_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, TCS3414_CONTROL,
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data->control);
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}
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#endif
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static SIMPLE_DEV_PM_OPS(tcs3414_pm_ops, tcs3414_suspend, tcs3414_resume);
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static const struct i2c_device_id tcs3414_id[] = {
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{ "tcs3414", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tcs3414_id);
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static struct i2c_driver tcs3414_driver = {
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.driver = {
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.name = TCS3414_DRV_NAME,
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.pm = &tcs3414_pm_ops,
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},
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.probe = tcs3414_probe,
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.remove = tcs3414_remove,
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.id_table = tcs3414_id,
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};
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module_i2c_driver(tcs3414_driver);
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MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
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MODULE_DESCRIPTION("TCS3414 digital color sensors driver");
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MODULE_LICENSE("GPL");
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