linux-imx

/*

 * vcnl4000.c - Support for Vishay VCNL4000/4010/4020/4200 combined ambient

 * light and proximity sensor

 *

 * Copyright 2012 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.

 *

 * IIO driver for:

 *   VCNL4000/10/20 (7-bit I2C slave address 0x13)

 *   VCNL4200 (7-bit I2C slave address 0x51)

 *

 * TODO:

 *   allow to adjust IR current

 *   proximity threshold and event handling

 *   periodic ALS/proximity measurement (VCNL4010/20)

 *   interrupts (VCNL4010/20, VCNL4200)

 */

​

#include <linux/module.h>

#include <linux/i2c.h>

#include <linux/err.h>

#include <linux/delay.h>

​

#include <linux/iio/iio.h>

#include <linux/iio/sysfs.h>

​

#define VCNL4000_DRV_NAME "vcnl4000"

#define VCNL4000_PROD_ID    0x01

#define VCNL4010_PROD_ID    0x02 /* for VCNL4020, VCNL4010 */

#define VCNL4200_PROD_ID    0x58

​

#define VCNL4000_COMMAND    0x80 /* Command register */

#define VCNL4000_PROD_REV   0x81 /* Product ID and Revision ID */

#define VCNL4000_LED_CURRENT    0x83 /* IR LED current for proximity mode */

#define VCNL4000_AL_PARAM   0x84 /* Ambient light parameter register */

#define VCNL4000_AL_RESULT_HI   0x85 /* Ambient light result register, MSB */

#define VCNL4000_AL_RESULT_LO   0x86 /* Ambient light result register, LSB */

#define VCNL4000_PS_RESULT_HI   0x87 /* Proximity result register, MSB */

#define VCNL4000_PS_RESULT_LO   0x88 /* Proximity result register, LSB */

#define VCNL4000_PS_MEAS_FREQ   0x89 /* Proximity test signal frequency */

#define VCNL4000_PS_MOD_ADJ 0x8a /* Proximity modulator timing adjustment */

​

#define VCNL4200_AL_CONF    0x00 /* Ambient light configuration */

#define VCNL4200_PS_CONF1   0x03 /* Proximity configuration */

#define VCNL4200_PS_DATA    0x08 /* Proximity data */

#define VCNL4200_AL_DATA    0x09 /* Ambient light data */

#define VCNL4200_DEV_ID     0x0e /* Device ID, slave address and version */

​

/* Bit masks for COMMAND register */

#define VCNL4000_AL_RDY     BIT(6) /* ALS data ready? */

#define VCNL4000_PS_RDY     BIT(5) /* proximity data ready? */

#define VCNL4000_AL_OD      BIT(4) /* start on-demand ALS measurement */

#define VCNL4000_PS_OD      BIT(3) /* start on-demand proximity measurement */

​

enum vcnl4000_device_ids {

    VCNL4000,

    VCNL4010,

    VCNL4200,

};

​

struct vcnl4200_channel {

    u8 reg;

    ktime_t last_measurement;

    ktime_t sampling_rate;

    struct mutex lock;

};

​

struct vcnl4000_data {

    struct i2c_client *client;

    enum vcnl4000_device_ids id;

    int rev;

    int al_scale;

    const struct vcnl4000_chip_spec *chip_spec;

    struct mutex vcnl4000_lock;

    struct vcnl4200_channel vcnl4200_al;

    struct vcnl4200_channel vcnl4200_ps;

};

​

struct vcnl4000_chip_spec {

    const char *prod;

    int (*init)(struct vcnl4000_data *data);

    int (*measure_light)(struct vcnl4000_data *data, int *val);

    int (*measure_proximity)(struct vcnl4000_data *data, int *val);

};

​

static const struct i2c_device_id vcnl4000_id[] = {

    { "vcnl4000", VCNL4000 },

    { "vcnl4010", VCNL4010 },

    { "vcnl4020", VCNL4010 },