403 lines
10 KiB
C
Executable File
403 lines
10 KiB
C
Executable File
/*
|
|
* tcs3414.c - Support for TAOS TCS3414 digital color sensor
|
|
*
|
|
* Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
|
|
*
|
|
* This file is subject to the terms and conditions of version 2 of
|
|
* the GNU General Public License. See the file COPYING in the main
|
|
* directory of this archive for more details.
|
|
*
|
|
* Digital color sensor with 16-bit channels for red, green, blue, clear);
|
|
* 7-bit I2C slave address 0x39 (TCS3414) or 0x29, 0x49, 0x59 (TCS3413,
|
|
* TCS3415, TCS3416, resp.)
|
|
*
|
|
* TODO: sync, interrupt support, thresholds, prescaler
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/pm.h>
|
|
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/iio/sysfs.h>
|
|
#include <linux/iio/trigger_consumer.h>
|
|
#include <linux/iio/buffer.h>
|
|
#include <linux/iio/triggered_buffer.h>
|
|
|
|
#define TCS3414_DRV_NAME "tcs3414"
|
|
|
|
#define TCS3414_COMMAND BIT(7)
|
|
#define TCS3414_COMMAND_WORD (TCS3414_COMMAND | BIT(5))
|
|
|
|
#define TCS3414_CONTROL (TCS3414_COMMAND | 0x00)
|
|
#define TCS3414_TIMING (TCS3414_COMMAND | 0x01)
|
|
#define TCS3414_ID (TCS3414_COMMAND | 0x04)
|
|
#define TCS3414_GAIN (TCS3414_COMMAND | 0x07)
|
|
#define TCS3414_DATA_GREEN (TCS3414_COMMAND_WORD | 0x10)
|
|
#define TCS3414_DATA_RED (TCS3414_COMMAND_WORD | 0x12)
|
|
#define TCS3414_DATA_BLUE (TCS3414_COMMAND_WORD | 0x14)
|
|
#define TCS3414_DATA_CLEAR (TCS3414_COMMAND_WORD | 0x16)
|
|
|
|
#define TCS3414_CONTROL_ADC_VALID BIT(4)
|
|
#define TCS3414_CONTROL_ADC_EN BIT(1)
|
|
#define TCS3414_CONTROL_POWER BIT(0)
|
|
|
|
#define TCS3414_INTEG_MASK GENMASK(1, 0)
|
|
#define TCS3414_INTEG_12MS 0x0
|
|
#define TCS3414_INTEG_100MS 0x1
|
|
#define TCS3414_INTEG_400MS 0x2
|
|
|
|
#define TCS3414_GAIN_MASK GENMASK(5, 4)
|
|
#define TCS3414_GAIN_SHIFT 4
|
|
|
|
struct tcs3414_data {
|
|
struct i2c_client *client;
|
|
u8 control;
|
|
u8 gain;
|
|
u8 timing;
|
|
u16 buffer[8]; /* 4x 16-bit + 8 bytes timestamp */
|
|
};
|
|
|
|
#define TCS3414_CHANNEL(_color, _si, _addr) { \
|
|
.type = IIO_INTENSITY, \
|
|
.modified = 1, \
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
|
|
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
|
|
BIT(IIO_CHAN_INFO_INT_TIME), \
|
|
.channel2 = IIO_MOD_LIGHT_##_color, \
|
|
.address = _addr, \
|
|
.scan_index = _si, \
|
|
.scan_type = { \
|
|
.sign = 'u', \
|
|
.realbits = 16, \
|
|
.storagebits = 16, \
|
|
.endianness = IIO_CPU, \
|
|
}, \
|
|
}
|
|
|
|
/* scale factors: 1/gain */
|
|
static const int tcs3414_scales[][2] = {
|
|
{1, 0}, {0, 250000}, {0, 62500}, {0, 15625}
|
|
};
|
|
|
|
/* integration time in ms */
|
|
static const int tcs3414_times[] = { 12, 100, 400 };
|
|
|
|
static const struct iio_chan_spec tcs3414_channels[] = {
|
|
TCS3414_CHANNEL(GREEN, 0, TCS3414_DATA_GREEN),
|
|
TCS3414_CHANNEL(RED, 1, TCS3414_DATA_RED),
|
|
TCS3414_CHANNEL(BLUE, 2, TCS3414_DATA_BLUE),
|
|
TCS3414_CHANNEL(CLEAR, 3, TCS3414_DATA_CLEAR),
|
|
IIO_CHAN_SOFT_TIMESTAMP(4),
|
|
};
|
|
|
|
static int tcs3414_req_data(struct tcs3414_data *data)
|
|
{
|
|
int tries = 25;
|
|
int ret;
|
|
|
|
ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
|
|
data->control | TCS3414_CONTROL_ADC_EN);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
while (tries--) {
|
|
ret = i2c_smbus_read_byte_data(data->client, TCS3414_CONTROL);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret & TCS3414_CONTROL_ADC_VALID)
|
|
break;
|
|
msleep(20);
|
|
}
|
|
|
|
ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
|
|
data->control);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (tries < 0) {
|
|
dev_err(&data->client->dev, "data not ready\n");
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tcs3414_read_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int *val, int *val2, long mask)
|
|
{
|
|
struct tcs3414_data *data = iio_priv(indio_dev);
|
|
int i, ret;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
ret = iio_device_claim_direct_mode(indio_dev);
|
|
if (ret)
|
|
return ret;
|
|
ret = tcs3414_req_data(data);
|
|
if (ret < 0) {
|
|
iio_device_release_direct_mode(indio_dev);
|
|
return ret;
|
|
}
|
|
ret = i2c_smbus_read_word_data(data->client, chan->address);
|
|
iio_device_release_direct_mode(indio_dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
*val = ret;
|
|
return IIO_VAL_INT;
|
|
case IIO_CHAN_INFO_SCALE:
|
|
i = (data->gain & TCS3414_GAIN_MASK) >> TCS3414_GAIN_SHIFT;
|
|
*val = tcs3414_scales[i][0];
|
|
*val2 = tcs3414_scales[i][1];
|
|
return IIO_VAL_INT_PLUS_MICRO;
|
|
case IIO_CHAN_INFO_INT_TIME:
|
|
*val = 0;
|
|
*val2 = tcs3414_times[data->timing & TCS3414_INTEG_MASK] * 1000;
|
|
return IIO_VAL_INT_PLUS_MICRO;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int tcs3414_write_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int val, int val2, long mask)
|
|
{
|
|
struct tcs3414_data *data = iio_priv(indio_dev);
|
|
int i;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_SCALE:
|
|
for (i = 0; i < ARRAY_SIZE(tcs3414_scales); i++) {
|
|
if (val == tcs3414_scales[i][0] &&
|
|
val2 == tcs3414_scales[i][1]) {
|
|
data->gain &= ~TCS3414_GAIN_MASK;
|
|
data->gain |= i << TCS3414_GAIN_SHIFT;
|
|
return i2c_smbus_write_byte_data(
|
|
data->client, TCS3414_GAIN,
|
|
data->gain);
|
|
}
|
|
}
|
|
return -EINVAL;
|
|
case IIO_CHAN_INFO_INT_TIME:
|
|
if (val != 0)
|
|
return -EINVAL;
|
|
for (i = 0; i < ARRAY_SIZE(tcs3414_times); i++) {
|
|
if (val2 == tcs3414_times[i] * 1000) {
|
|
data->timing &= ~TCS3414_INTEG_MASK;
|
|
data->timing |= i;
|
|
return i2c_smbus_write_byte_data(
|
|
data->client, TCS3414_TIMING,
|
|
data->timing);
|
|
}
|
|
}
|
|
return -EINVAL;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static irqreturn_t tcs3414_trigger_handler(int irq, void *p)
|
|
{
|
|
struct iio_poll_func *pf = p;
|
|
struct iio_dev *indio_dev = pf->indio_dev;
|
|
struct tcs3414_data *data = iio_priv(indio_dev);
|
|
int i, j = 0;
|
|
|
|
for_each_set_bit(i, indio_dev->active_scan_mask,
|
|
indio_dev->masklength) {
|
|
int ret = i2c_smbus_read_word_data(data->client,
|
|
TCS3414_DATA_GREEN + 2*i);
|
|
if (ret < 0)
|
|
goto done;
|
|
|
|
data->buffer[j++] = ret;
|
|
}
|
|
|
|
iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
|
|
iio_get_time_ns(indio_dev));
|
|
|
|
done:
|
|
iio_trigger_notify_done(indio_dev->trig);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static IIO_CONST_ATTR(scale_available, "1 0.25 0.0625 0.015625");
|
|
static IIO_CONST_ATTR_INT_TIME_AVAIL("0.012 0.1 0.4");
|
|
|
|
static struct attribute *tcs3414_attributes[] = {
|
|
&iio_const_attr_scale_available.dev_attr.attr,
|
|
&iio_const_attr_integration_time_available.dev_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group tcs3414_attribute_group = {
|
|
.attrs = tcs3414_attributes,
|
|
};
|
|
|
|
static const struct iio_info tcs3414_info = {
|
|
.read_raw = tcs3414_read_raw,
|
|
.write_raw = tcs3414_write_raw,
|
|
.attrs = &tcs3414_attribute_group,
|
|
.driver_module = THIS_MODULE,
|
|
};
|
|
|
|
static int tcs3414_buffer_preenable(struct iio_dev *indio_dev)
|
|
{
|
|
struct tcs3414_data *data = iio_priv(indio_dev);
|
|
|
|
data->control |= TCS3414_CONTROL_ADC_EN;
|
|
return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
|
|
data->control);
|
|
}
|
|
|
|
static int tcs3414_buffer_predisable(struct iio_dev *indio_dev)
|
|
{
|
|
struct tcs3414_data *data = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
ret = iio_triggered_buffer_predisable(indio_dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
data->control &= ~TCS3414_CONTROL_ADC_EN;
|
|
return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
|
|
data->control);
|
|
}
|
|
|
|
static const struct iio_buffer_setup_ops tcs3414_buffer_setup_ops = {
|
|
.preenable = tcs3414_buffer_preenable,
|
|
.postenable = &iio_triggered_buffer_postenable,
|
|
.predisable = tcs3414_buffer_predisable,
|
|
};
|
|
|
|
static int tcs3414_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct tcs3414_data *data;
|
|
struct iio_dev *indio_dev;
|
|
int ret;
|
|
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
|
|
if (indio_dev == NULL)
|
|
return -ENOMEM;
|
|
|
|
data = iio_priv(indio_dev);
|
|
i2c_set_clientdata(client, indio_dev);
|
|
data->client = client;
|
|
|
|
indio_dev->dev.parent = &client->dev;
|
|
indio_dev->info = &tcs3414_info;
|
|
indio_dev->name = TCS3414_DRV_NAME;
|
|
indio_dev->channels = tcs3414_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(tcs3414_channels);
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
ret = i2c_smbus_read_byte_data(data->client, TCS3414_ID);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
switch (ret & 0xf0) {
|
|
case 0x00:
|
|
dev_info(&client->dev, "TCS3404 found\n");
|
|
break;
|
|
case 0x10:
|
|
dev_info(&client->dev, "TCS3413/14/15/16 found\n");
|
|
break;
|
|
default:
|
|
return -ENODEV;
|
|
}
|
|
|
|
data->control = TCS3414_CONTROL_POWER;
|
|
ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
|
|
data->control);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
data->timing = TCS3414_INTEG_12MS; /* free running */
|
|
ret = i2c_smbus_write_byte_data(data->client, TCS3414_TIMING,
|
|
data->timing);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = i2c_smbus_read_byte_data(data->client, TCS3414_GAIN);
|
|
if (ret < 0)
|
|
return ret;
|
|
data->gain = ret;
|
|
|
|
ret = iio_triggered_buffer_setup(indio_dev, NULL,
|
|
tcs3414_trigger_handler, &tcs3414_buffer_setup_ops);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret < 0)
|
|
goto buffer_cleanup;
|
|
|
|
return 0;
|
|
|
|
buffer_cleanup:
|
|
iio_triggered_buffer_cleanup(indio_dev);
|
|
return ret;
|
|
}
|
|
|
|
static int tcs3414_powerdown(struct tcs3414_data *data)
|
|
{
|
|
return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
|
|
data->control & ~(TCS3414_CONTROL_POWER |
|
|
TCS3414_CONTROL_ADC_EN));
|
|
}
|
|
|
|
static int tcs3414_remove(struct i2c_client *client)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
iio_triggered_buffer_cleanup(indio_dev);
|
|
tcs3414_powerdown(iio_priv(indio_dev));
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int tcs3414_suspend(struct device *dev)
|
|
{
|
|
struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
|
|
to_i2c_client(dev)));
|
|
return tcs3414_powerdown(data);
|
|
}
|
|
|
|
static int tcs3414_resume(struct device *dev)
|
|
{
|
|
struct tcs3414_data *data = iio_priv(i2c_get_clientdata(
|
|
to_i2c_client(dev)));
|
|
return i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
|
|
data->control);
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(tcs3414_pm_ops, tcs3414_suspend, tcs3414_resume);
|
|
|
|
static const struct i2c_device_id tcs3414_id[] = {
|
|
{ "tcs3414", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, tcs3414_id);
|
|
|
|
static struct i2c_driver tcs3414_driver = {
|
|
.driver = {
|
|
.name = TCS3414_DRV_NAME,
|
|
.pm = &tcs3414_pm_ops,
|
|
},
|
|
.probe = tcs3414_probe,
|
|
.remove = tcs3414_remove,
|
|
.id_table = tcs3414_id,
|
|
};
|
|
module_i2c_driver(tcs3414_driver);
|
|
|
|
MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
|
|
MODULE_DESCRIPTION("TCS3414 digital color sensors driver");
|
|
MODULE_LICENSE("GPL");
|