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linux/drivers/iio/light/tcs3414.c
Alexandru Ardelean 0fe2f2b789 iio: tcs3414: fix iio_triggered_buffer_{pre,post}enable positions 
The iio_triggered_buffer_{predisable,postenable} functions attach/detach
the poll functions.

For the predisable hook, the disable code should occur before detaching
the poll func, and for the postenable hook, the poll func should be
attached before the enable code.

The driver was slightly reworked. The preenable hook was moved to the
postenable, to add some symmetry to the postenable/predisable part.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2019-09-21 16:31:38 +01:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* tcs3414.c - Support for TAOS TCS3414 digital color sensor
*
* Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
*
* 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,
};
static int tcs3414_buffer_postenable(struct iio_dev *indio_dev)
{
struct tcs3414_data *data = iio_priv(indio_dev);
int ret;
ret = iio_triggered_buffer_postenable(indio_dev);
if (ret)
return ret;
data->control |= TCS3414_CONTROL_ADC_EN;
ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
data->control);
if (ret)
iio_triggered_buffer_predisable(indio_dev);
return ret;
}
static int tcs3414_buffer_predisable(struct iio_dev *indio_dev)
{
struct tcs3414_data *data = iio_priv(indio_dev);
int ret, ret2;
data->control &= ~TCS3414_CONTROL_ADC_EN;
ret = i2c_smbus_write_byte_data(data->client, TCS3414_CONTROL,
data->control);
ret2 = iio_triggered_buffer_predisable(indio_dev);
if (!ret)
ret = ret2;
return ret;
}
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->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");
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