mirror of https://gitee.com/openkylin/linux.git
348 lines
8.2 KiB
C
348 lines
8.2 KiB
C
/*
|
|
* isl29125.c - Support for Intersil ISL29125 RGB light 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.
|
|
*
|
|
* RGB light sensor with 16-bit channels for red, green, blue);
|
|
* 7-bit I2C slave address 0x44
|
|
*
|
|
* TODO: interrupt support, IR compensation, thresholds, 12bit
|
|
*/
|
|
|
|
#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 ISL29125_DRV_NAME "isl29125"
|
|
|
|
#define ISL29125_DEVICE_ID 0x00
|
|
#define ISL29125_CONF1 0x01
|
|
#define ISL29125_CONF2 0x02
|
|
#define ISL29125_CONF3 0x03
|
|
#define ISL29125_STATUS 0x08
|
|
#define ISL29125_GREEN_DATA 0x09
|
|
#define ISL29125_RED_DATA 0x0b
|
|
#define ISL29125_BLUE_DATA 0x0d
|
|
|
|
#define ISL29125_ID 0x7d
|
|
|
|
#define ISL29125_MODE_MASK GENMASK(2, 0)
|
|
#define ISL29125_MODE_PD 0x0
|
|
#define ISL29125_MODE_G 0x1
|
|
#define ISL29125_MODE_R 0x2
|
|
#define ISL29125_MODE_B 0x3
|
|
#define ISL29125_MODE_RGB 0x5
|
|
|
|
#define ISL29125_MODE_RANGE BIT(3)
|
|
|
|
#define ISL29125_STATUS_CONV BIT(1)
|
|
|
|
struct isl29125_data {
|
|
struct i2c_client *client;
|
|
struct mutex lock;
|
|
u8 conf1;
|
|
u16 buffer[8]; /* 3x 16-bit, padding, 8 bytes timestamp */
|
|
};
|
|
|
|
#define ISL29125_CHANNEL(_color, _si) { \
|
|
.type = IIO_INTENSITY, \
|
|
.modified = 1, \
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
|
|
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
|
|
.channel2 = IIO_MOD_LIGHT_##_color, \
|
|
.scan_index = _si, \
|
|
.scan_type = { \
|
|
.sign = 'u', \
|
|
.realbits = 16, \
|
|
.storagebits = 16, \
|
|
.endianness = IIO_CPU, \
|
|
}, \
|
|
}
|
|
|
|
static const struct iio_chan_spec isl29125_channels[] = {
|
|
ISL29125_CHANNEL(GREEN, 0),
|
|
ISL29125_CHANNEL(RED, 1),
|
|
ISL29125_CHANNEL(BLUE, 2),
|
|
IIO_CHAN_SOFT_TIMESTAMP(3),
|
|
};
|
|
|
|
static const struct {
|
|
u8 mode, data;
|
|
} isl29125_regs[] = {
|
|
{ISL29125_MODE_G, ISL29125_GREEN_DATA},
|
|
{ISL29125_MODE_R, ISL29125_RED_DATA},
|
|
{ISL29125_MODE_B, ISL29125_BLUE_DATA},
|
|
};
|
|
|
|
static int isl29125_read_data(struct isl29125_data *data, int si)
|
|
{
|
|
int tries = 5;
|
|
int ret;
|
|
|
|
ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
|
|
data->conf1 | isl29125_regs[si].mode);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
msleep(101);
|
|
|
|
while (tries--) {
|
|
ret = i2c_smbus_read_byte_data(data->client, ISL29125_STATUS);
|
|
if (ret < 0)
|
|
goto fail;
|
|
if (ret & ISL29125_STATUS_CONV)
|
|
break;
|
|
msleep(20);
|
|
}
|
|
|
|
if (tries < 0) {
|
|
dev_err(&data->client->dev, "data not ready\n");
|
|
ret = -EIO;
|
|
goto fail;
|
|
}
|
|
|
|
ret = i2c_smbus_read_word_data(data->client, isl29125_regs[si].data);
|
|
|
|
fail:
|
|
i2c_smbus_write_byte_data(data->client, ISL29125_CONF1, data->conf1);
|
|
return ret;
|
|
}
|
|
|
|
static int isl29125_read_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int *val, int *val2, long mask)
|
|
{
|
|
struct isl29125_data *data = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
if (iio_buffer_enabled(indio_dev))
|
|
return -EBUSY;
|
|
mutex_lock(&data->lock);
|
|
ret = isl29125_read_data(data, chan->scan_index);
|
|
mutex_unlock(&data->lock);
|
|
if (ret < 0)
|
|
return ret;
|
|
*val = ret;
|
|
return IIO_VAL_INT;
|
|
case IIO_CHAN_INFO_SCALE:
|
|
*val = 0;
|
|
if (data->conf1 & ISL29125_MODE_RANGE)
|
|
*val2 = 152590; /* 10k lux full range */
|
|
else
|
|
*val2 = 5722; /* 375 lux full range */
|
|
return IIO_VAL_INT_PLUS_MICRO;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int isl29125_write_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int val, int val2, long mask)
|
|
{
|
|
struct isl29125_data *data = iio_priv(indio_dev);
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_SCALE:
|
|
if (val != 0)
|
|
return -EINVAL;
|
|
if (val2 == 152590)
|
|
data->conf1 |= ISL29125_MODE_RANGE;
|
|
else if (val2 == 5722)
|
|
data->conf1 &= ~ISL29125_MODE_RANGE;
|
|
else
|
|
return -EINVAL;
|
|
return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
|
|
data->conf1);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static irqreturn_t isl29125_trigger_handler(int irq, void *p)
|
|
{
|
|
struct iio_poll_func *pf = p;
|
|
struct iio_dev *indio_dev = pf->indio_dev;
|
|
struct isl29125_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,
|
|
isl29125_regs[i].data);
|
|
if (ret < 0)
|
|
goto done;
|
|
|
|
data->buffer[j++] = ret;
|
|
}
|
|
|
|
iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
|
|
iio_get_time_ns());
|
|
|
|
done:
|
|
iio_trigger_notify_done(indio_dev->trig);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static const struct iio_info isl29125_info = {
|
|
.read_raw = isl29125_read_raw,
|
|
.write_raw = isl29125_write_raw,
|
|
.driver_module = THIS_MODULE,
|
|
};
|
|
|
|
static int isl29125_buffer_preenable(struct iio_dev *indio_dev)
|
|
{
|
|
struct isl29125_data *data = iio_priv(indio_dev);
|
|
|
|
data->conf1 |= ISL29125_MODE_RGB;
|
|
return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
|
|
data->conf1);
|
|
}
|
|
|
|
static int isl29125_buffer_predisable(struct iio_dev *indio_dev)
|
|
{
|
|
struct isl29125_data *data = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
ret = iio_triggered_buffer_predisable(indio_dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
data->conf1 &= ~ISL29125_MODE_MASK;
|
|
data->conf1 |= ISL29125_MODE_PD;
|
|
return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
|
|
data->conf1);
|
|
}
|
|
|
|
static const struct iio_buffer_setup_ops isl29125_buffer_setup_ops = {
|
|
.preenable = isl29125_buffer_preenable,
|
|
.postenable = &iio_triggered_buffer_postenable,
|
|
.predisable = isl29125_buffer_predisable,
|
|
};
|
|
|
|
static int isl29125_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct isl29125_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;
|
|
mutex_init(&data->lock);
|
|
|
|
indio_dev->dev.parent = &client->dev;
|
|
indio_dev->info = &isl29125_info;
|
|
indio_dev->name = ISL29125_DRV_NAME;
|
|
indio_dev->channels = isl29125_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(isl29125_channels);
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
ret = i2c_smbus_read_byte_data(data->client, ISL29125_DEVICE_ID);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret != ISL29125_ID)
|
|
return -ENODEV;
|
|
|
|
data->conf1 = ISL29125_MODE_PD | ISL29125_MODE_RANGE;
|
|
ret = i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
|
|
data->conf1);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = i2c_smbus_write_byte_data(data->client, ISL29125_STATUS, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = iio_triggered_buffer_setup(indio_dev, NULL,
|
|
isl29125_trigger_handler, &isl29125_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 isl29125_powerdown(struct isl29125_data *data)
|
|
{
|
|
return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
|
|
(data->conf1 & ~ISL29125_MODE_MASK) | ISL29125_MODE_PD);
|
|
}
|
|
|
|
static int isl29125_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);
|
|
isl29125_powerdown(iio_priv(indio_dev));
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int isl29125_suspend(struct device *dev)
|
|
{
|
|
struct isl29125_data *data = iio_priv(i2c_get_clientdata(
|
|
to_i2c_client(dev)));
|
|
return isl29125_powerdown(data);
|
|
}
|
|
|
|
static int isl29125_resume(struct device *dev)
|
|
{
|
|
struct isl29125_data *data = iio_priv(i2c_get_clientdata(
|
|
to_i2c_client(dev)));
|
|
return i2c_smbus_write_byte_data(data->client, ISL29125_CONF1,
|
|
data->conf1);
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(isl29125_pm_ops, isl29125_suspend, isl29125_resume);
|
|
|
|
static const struct i2c_device_id isl29125_id[] = {
|
|
{ "isl29125", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, isl29125_id);
|
|
|
|
static struct i2c_driver isl29125_driver = {
|
|
.driver = {
|
|
.name = ISL29125_DRV_NAME,
|
|
.pm = &isl29125_pm_ops,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = isl29125_probe,
|
|
.remove = isl29125_remove,
|
|
.id_table = isl29125_id,
|
|
};
|
|
module_i2c_driver(isl29125_driver);
|
|
|
|
MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
|
|
MODULE_DESCRIPTION("ISL29125 RGB light sensor driver");
|
|
MODULE_LICENSE("GPL");
|