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// SPDX-License-Identifier: GPL-2.0-only
/*
* adjd_s311.c - Support for ADJD-S311-CR999 digital color sensor
*
* Copyright (C) 2012 Peter Meerwald <pmeerw@pmeerw.net>
*
* driver for ADJD-S311-CR999 digital color sensor (10-bit channels for
* red, green, blue, clear); 7-bit I2C slave address 0x74
*
* limitations: no calibration, no offset mode, no sleep mode
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/bitmap.h>
#include <linux/err.h>
#include <linux/irq.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 ADJD_S311_DRV_NAME "adjd_s311"
#define ADJD_S311_CTRL 0x00
#define ADJD_S311_CONFIG 0x01
#define ADJD_S311_CAP_RED 0x06
#define ADJD_S311_CAP_GREEN 0x07
#define ADJD_S311_CAP_BLUE 0x08
#define ADJD_S311_CAP_CLEAR 0x09
#define ADJD_S311_INT_RED 0x0a
#define ADJD_S311_INT_GREEN 0x0c
#define ADJD_S311_INT_BLUE 0x0e
#define ADJD_S311_INT_CLEAR 0x10
#define ADJD_S311_DATA_RED 0x40
#define ADJD_S311_DATA_GREEN 0x42
#define ADJD_S311_DATA_BLUE 0x44
#define ADJD_S311_DATA_CLEAR 0x46
#define ADJD_S311_OFFSET_RED 0x48
#define ADJD_S311_OFFSET_GREEN 0x49
#define ADJD_S311_OFFSET_BLUE 0x4a
#define ADJD_S311_OFFSET_CLEAR 0x4b
#define ADJD_S311_CTRL_GOFS 0x02
#define ADJD_S311_CTRL_GSSR 0x01
#define ADJD_S311_CAP_MASK 0x0f
#define ADJD_S311_INT_MASK 0x0fff
#define ADJD_S311_DATA_MASK 0x03ff
struct adjd_s311_data {
struct i2c_client *client;
struct {
s16 chans[4];
s64 ts __aligned(8);
} scan;
};
enum adjd_s311_channel_idx {
IDX_RED, IDX_GREEN, IDX_BLUE, IDX_CLEAR
};
#define ADJD_S311_DATA_REG(chan) (ADJD_S311_DATA_RED + (chan) * 2)
#define ADJD_S311_INT_REG(chan) (ADJD_S311_INT_RED + (chan) * 2)
#define ADJD_S311_CAP_REG(chan) (ADJD_S311_CAP_RED + (chan))
static int adjd_s311_req_data(struct iio_dev *indio_dev)
{
struct adjd_s311_data *data = iio_priv(indio_dev);
int tries = 10;
int ret = i2c_smbus_write_byte_data(data->client, ADJD_S311_CTRL,
ADJD_S311_CTRL_GSSR);
if (ret < 0)
return ret;
while (tries--) {
ret = i2c_smbus_read_byte_data(data->client, ADJD_S311_CTRL);
if (ret < 0)
return ret;
if (!(ret & ADJD_S311_CTRL_GSSR))
break;
msleep(20);
}
if (tries < 0) {
dev_err(&data->client->dev,
"adjd_s311_req_data() failed, data not ready\n");
return -EIO;
}
return 0;
}
static int adjd_s311_read_data(struct iio_dev *indio_dev, u8 reg, int *val)
{
struct adjd_s311_data *data = iio_priv(indio_dev);
int ret = adjd_s311_req_data(indio_dev);
if (ret < 0)
return ret;
ret = i2c_smbus_read_word_data(data->client, reg);
if (ret < 0)
return ret;
*val = ret & ADJD_S311_DATA_MASK;
return 0;
}
static irqreturn_t adjd_s311_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct adjd_s311_data *data = iio_priv(indio_dev);
s64 time_ns = iio_get_time_ns(indio_dev);
int i, j = 0;
int ret = adjd_s311_req_data(indio_dev);
if (ret < 0)
goto done;
for_each_set_bit(i, indio_dev->active_scan_mask,
indio_dev->masklength) {
ret = i2c_smbus_read_word_data(data->client,
ADJD_S311_DATA_REG(i));
if (ret < 0)
goto done;
data->scan.chans[j++] = ret & ADJD_S311_DATA_MASK;
}
iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, time_ns);
done:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
#define ADJD_S311_CHANNEL(_color, _scan_idx) { \
.type = IIO_INTENSITY, \
.modified = 1, \
.address = (IDX_##_color), \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_HARDWAREGAIN) | \
BIT(IIO_CHAN_INFO_INT_TIME), \
.channel2 = (IIO_MOD_LIGHT_##_color), \
.scan_index = (_scan_idx), \
.scan_type = { \
.sign = 'u', \
.realbits = 10, \
.storagebits = 16, \
.endianness = IIO_CPU, \
}, \
}
static const struct iio_chan_spec adjd_s311_channels[] = {
ADJD_S311_CHANNEL(RED, 0),
ADJD_S311_CHANNEL(GREEN, 1),
ADJD_S311_CHANNEL(BLUE, 2),
ADJD_S311_CHANNEL(CLEAR, 3),
IIO_CHAN_SOFT_TIMESTAMP(4),
};
static int adjd_s311_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct adjd_s311_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = adjd_s311_read_data(indio_dev,
ADJD_S311_DATA_REG(chan->address), val);
if (ret < 0)
return ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_HARDWAREGAIN:
ret = i2c_smbus_read_byte_data(data->client,
ADJD_S311_CAP_REG(chan->address));
if (ret < 0)
return ret;
*val = ret & ADJD_S311_CAP_MASK;
return IIO_VAL_INT;
case IIO_CHAN_INFO_INT_TIME:
ret = i2c_smbus_read_word_data(data->client,
ADJD_S311_INT_REG(chan->address));
if (ret < 0)
return ret;
*val = 0;
/*
* not documented, based on measurement:
* 4095 LSBs correspond to roughly 4 ms
*/
*val2 = ret & ADJD_S311_INT_MASK;
return IIO_VAL_INT_PLUS_MICRO;
}
return -EINVAL;
}
static int adjd_s311_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct adjd_s311_data *data = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_HARDWAREGAIN:
if (val < 0 || val > ADJD_S311_CAP_MASK)
return -EINVAL;
return i2c_smbus_write_byte_data(data->client,
ADJD_S311_CAP_REG(chan->address), val);
case IIO_CHAN_INFO_INT_TIME:
if (val != 0 || val2 < 0 || val2 > ADJD_S311_INT_MASK)
return -EINVAL;
return i2c_smbus_write_word_data(data->client,
ADJD_S311_INT_REG(chan->address), val2);
}
return -EINVAL;
}
static const struct iio_info adjd_s311_info = {
.read_raw = adjd_s311_read_raw,
.write_raw = adjd_s311_write_raw,
};
static int adjd_s311_probe(struct i2c_client *client)
{
struct adjd_s311_data *data;
struct iio_dev *indio_dev;
int err;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (indio_dev == NULL)
return -ENOMEM;
data = iio_priv(indio_dev);
data->client = client;
indio_dev->info = &adjd_s311_info;
indio_dev->name = ADJD_S311_DRV_NAME;
indio_dev->channels = adjd_s311_channels;
indio_dev->num_channels = ARRAY_SIZE(adjd_s311_channels);
indio_dev->modes = INDIO_DIRECT_MODE;
err = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL,
adjd_s311_trigger_handler, NULL);
if (err < 0)
return err;
return devm_iio_device_register(&client->dev, indio_dev);
}
static const struct i2c_device_id adjd_s311_id[] = {
{ "adjd_s311" },
{ }
};
MODULE_DEVICE_TABLE(i2c, adjd_s311_id);
static struct i2c_driver adjd_s311_driver = {
.driver = {
.name = ADJD_S311_DRV_NAME,
},
.probe = adjd_s311_probe,
.id_table = adjd_s311_id,
};
module_i2c_driver(adjd_s311_driver);
MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
MODULE_DESCRIPTION("ADJD-S311 color sensor");
MODULE_LICENSE("GPL");
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