mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
395 lines
9.7 KiB
395 lines
9.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* tcs3414.c - Support for TAOS TCS3414 digital color sensor |
|
* |
|
* Copyright (c) 2014 Peter Meerwald <[email protected]> |
|
* |
|
* 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; |
|
/* Ensure timestamp is naturally aligned */ |
|
struct { |
|
u16 chans[4]; |
|
s64 timestamp __aligned(8); |
|
} scan; |
|
}; |
|
|
|
#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->scan.chans[j++] = ret; |
|
} |
|
|
|
iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, |
|
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, |
|
}; |
|
|
|
static int tcs3414_buffer_postenable(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); |
|
|
|
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 = { |
|
.postenable = tcs3414_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->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 <[email protected]>"); |
|
MODULE_DESCRIPTION("TCS3414 digital color sensors driver"); |
|
MODULE_LICENSE("GPL");
|
|
|