mirror of https://gitee.com/openkylin/linux.git
199 lines
5.0 KiB
C
199 lines
5.0 KiB
C
/*
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* vcnl4000.c - Support for Vishay VCNL4000 combined ambient light and
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* proximity sensor
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*
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* Copyright 2012 Peter Meerwald <pmeerw@pmeerw.net>
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*
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* IIO driver for VCNL4000 (7-bit I2C slave address 0x13)
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*
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* TODO:
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* allow to adjust IR current
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* proximity threshold and event handling
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#define VCNL4000_DRV_NAME "vcnl4000"
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#define VCNL4000_COMMAND 0x80 /* Command register */
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#define VCNL4000_PROD_REV 0x81 /* Product ID and Revision ID */
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#define VCNL4000_LED_CURRENT 0x83 /* IR LED current for proximity mode */
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#define VCNL4000_AL_PARAM 0x84 /* Ambient light parameter register */
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#define VCNL4000_AL_RESULT_HI 0x85 /* Ambient light result register, MSB */
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#define VCNL4000_AL_RESULT_LO 0x86 /* Ambient light result register, LSB */
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#define VCNL4000_PS_RESULT_HI 0x87 /* Proximity result register, MSB */
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#define VCNL4000_PS_RESULT_LO 0x88 /* Proximity result register, LSB */
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#define VCNL4000_PS_MEAS_FREQ 0x89 /* Proximity test signal frequency */
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#define VCNL4000_PS_MOD_ADJ 0x8a /* Proximity modulator timing adjustment */
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/* Bit masks for COMMAND register */
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#define VCNL4000_AL_RDY 0x40 /* ALS data ready? */
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#define VCNL4000_PS_RDY 0x20 /* proximity data ready? */
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#define VCNL4000_AL_OD 0x10 /* start on-demand ALS measurement */
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#define VCNL4000_PS_OD 0x08 /* start on-demand proximity measurement */
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struct vcnl4000_data {
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struct i2c_client *client;
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};
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static const struct i2c_device_id vcnl4000_id[] = {
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{ "vcnl4000", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, vcnl4000_id);
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static int vcnl4000_measure(struct vcnl4000_data *data, u8 req_mask,
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u8 rdy_mask, u8 data_reg, int *val)
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{
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int tries = 20;
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__be16 buf;
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int ret;
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ret = i2c_smbus_write_byte_data(data->client, VCNL4000_COMMAND,
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req_mask);
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if (ret < 0)
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return ret;
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/* wait for data to become ready */
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while (tries--) {
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ret = i2c_smbus_read_byte_data(data->client, VCNL4000_COMMAND);
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if (ret < 0)
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return ret;
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if (ret & rdy_mask)
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break;
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msleep(20); /* measurement takes up to 100 ms */
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}
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if (tries < 0) {
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dev_err(&data->client->dev,
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"vcnl4000_measure() failed, data not ready\n");
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return -EIO;
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}
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ret = i2c_smbus_read_i2c_block_data(data->client,
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data_reg, sizeof(buf), (u8 *) &buf);
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if (ret < 0)
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return ret;
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*val = be16_to_cpu(buf);
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return 0;
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}
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static const struct iio_chan_spec vcnl4000_channels[] = {
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{
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.type = IIO_LIGHT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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}, {
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.type = IIO_PROXIMITY,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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}
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};
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static int vcnl4000_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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int ret = -EINVAL;
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struct vcnl4000_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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switch (chan->type) {
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case IIO_LIGHT:
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ret = vcnl4000_measure(data,
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VCNL4000_AL_OD, VCNL4000_AL_RDY,
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VCNL4000_AL_RESULT_HI, val);
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if (ret < 0)
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return ret;
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ret = IIO_VAL_INT;
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break;
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case IIO_PROXIMITY:
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ret = vcnl4000_measure(data,
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VCNL4000_PS_OD, VCNL4000_PS_RDY,
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VCNL4000_PS_RESULT_HI, val);
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if (ret < 0)
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return ret;
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ret = IIO_VAL_INT;
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break;
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default:
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break;
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}
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break;
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case IIO_CHAN_INFO_SCALE:
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if (chan->type == IIO_LIGHT) {
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*val = 0;
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*val2 = 250000;
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ret = IIO_VAL_INT_PLUS_MICRO;
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}
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break;
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default:
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break;
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}
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return ret;
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}
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static const struct iio_info vcnl4000_info = {
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.read_raw = vcnl4000_read_raw,
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.driver_module = THIS_MODULE,
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};
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static int vcnl4000_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct vcnl4000_data *data;
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struct iio_dev *indio_dev;
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int ret;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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ret = i2c_smbus_read_byte_data(data->client, VCNL4000_PROD_REV);
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if (ret < 0)
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return ret;
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dev_info(&client->dev, "VCNL4000 Ambient light/proximity sensor, Prod %02x, Rev: %02x\n",
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ret >> 4, ret & 0xf);
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indio_dev->dev.parent = &client->dev;
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indio_dev->info = &vcnl4000_info;
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indio_dev->channels = vcnl4000_channels;
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indio_dev->num_channels = ARRAY_SIZE(vcnl4000_channels);
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indio_dev->name = VCNL4000_DRV_NAME;
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indio_dev->modes = INDIO_DIRECT_MODE;
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return devm_iio_device_register(&client->dev, indio_dev);
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}
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static struct i2c_driver vcnl4000_driver = {
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.driver = {
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.name = VCNL4000_DRV_NAME,
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.owner = THIS_MODULE,
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},
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.probe = vcnl4000_probe,
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.id_table = vcnl4000_id,
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};
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module_i2c_driver(vcnl4000_driver);
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MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
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MODULE_DESCRIPTION("Vishay VCNL4000 proximity/ambient light sensor driver");
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MODULE_LICENSE("GPL");
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