2 * vcnl4000.c - Support for Vishay VCNL4000 combined ambient light and
5 * Copyright 2012 Peter Meerwald <pmeerw@pmeerw.net>
7 * This file is subject to the terms and conditions of version 2 of
8 * the GNU General Public License. See the file COPYING in the main
9 * directory of this archive for more details.
11 * IIO driver for VCNL4000 (7-bit I2C slave address 0x13)
14 * allow to adjust IR current
15 * proximity threshold and event handling
18 #include <linux/module.h>
19 #include <linux/i2c.h>
20 #include <linux/err.h>
21 #include <linux/delay.h>
23 #include <linux/iio/iio.h>
24 #include <linux/iio/sysfs.h>
26 #define VCNL4000_DRV_NAME "vcnl4000"
28 #define VCNL4000_COMMAND 0x80 /* Command register */
29 #define VCNL4000_PROD_REV 0x81 /* Product ID and Revision ID */
30 #define VCNL4000_LED_CURRENT 0x83 /* IR LED current for proximity mode */
31 #define VCNL4000_AL_PARAM 0x84 /* Ambient light parameter register */
32 #define VCNL4000_AL_RESULT_HI 0x85 /* Ambient light result register, MSB */
33 #define VCNL4000_AL_RESULT_LO 0x86 /* Ambient light result register, LSB */
34 #define VCNL4000_PS_RESULT_HI 0x87 /* Proximity result register, MSB */
35 #define VCNL4000_PS_RESULT_LO 0x88 /* Proximity result register, LSB */
36 #define VCNL4000_PS_MEAS_FREQ 0x89 /* Proximity test signal frequency */
37 #define VCNL4000_PS_MOD_ADJ 0x8a /* Proximity modulator timing adjustment */
39 /* Bit masks for COMMAND register */
40 #define VCNL4000_AL_RDY 0x40 /* ALS data ready? */
41 #define VCNL4000_PS_RDY 0x20 /* proximity data ready? */
42 #define VCNL4000_AL_OD 0x10 /* start on-demand ALS measurement */
43 #define VCNL4000_PS_OD 0x08 /* start on-demand proximity measurement */
45 struct vcnl4000_data
{
46 struct i2c_client
*client
;
49 static const struct i2c_device_id vcnl4000_id
[] = {
53 MODULE_DEVICE_TABLE(i2c
, vcnl4000_id
);
55 static int vcnl4000_measure(struct vcnl4000_data
*data
, u8 req_mask
,
56 u8 rdy_mask
, u8 data_reg
, int *val
)
62 ret
= i2c_smbus_write_byte_data(data
->client
, VCNL4000_COMMAND
,
67 /* wait for data to become ready */
69 ret
= i2c_smbus_read_byte_data(data
->client
, VCNL4000_COMMAND
);
74 msleep(20); /* measurement takes up to 100 ms */
78 dev_err(&data
->client
->dev
,
79 "vcnl4000_measure() failed, data not ready\n");
83 ret
= i2c_smbus_read_i2c_block_data(data
->client
,
84 data_reg
, sizeof(buf
), (u8
*) &buf
);
88 *val
= be16_to_cpu(buf
);
93 static const struct iio_chan_spec vcnl4000_channels
[] = {
96 .info_mask_separate
= BIT(IIO_CHAN_INFO_RAW
) |
97 BIT(IIO_CHAN_INFO_SCALE
),
99 .type
= IIO_PROXIMITY
,
100 .info_mask_separate
= BIT(IIO_CHAN_INFO_RAW
),
104 static int vcnl4000_read_raw(struct iio_dev
*indio_dev
,
105 struct iio_chan_spec
const *chan
,
106 int *val
, int *val2
, long mask
)
109 struct vcnl4000_data
*data
= iio_priv(indio_dev
);
112 case IIO_CHAN_INFO_RAW
:
113 switch (chan
->type
) {
115 ret
= vcnl4000_measure(data
,
116 VCNL4000_AL_OD
, VCNL4000_AL_RDY
,
117 VCNL4000_AL_RESULT_HI
, val
);
123 ret
= vcnl4000_measure(data
,
124 VCNL4000_PS_OD
, VCNL4000_PS_RDY
,
125 VCNL4000_PS_RESULT_HI
, val
);
134 case IIO_CHAN_INFO_SCALE
:
135 if (chan
->type
== IIO_LIGHT
) {
138 ret
= IIO_VAL_INT_PLUS_MICRO
;
148 static const struct iio_info vcnl4000_info
= {
149 .read_raw
= vcnl4000_read_raw
,
150 .driver_module
= THIS_MODULE
,
153 static int vcnl4000_probe(struct i2c_client
*client
,
154 const struct i2c_device_id
*id
)
156 struct vcnl4000_data
*data
;
157 struct iio_dev
*indio_dev
;
160 indio_dev
= devm_iio_device_alloc(&client
->dev
, sizeof(*data
));
164 data
= iio_priv(indio_dev
);
165 i2c_set_clientdata(client
, indio_dev
);
166 data
->client
= client
;
168 ret
= i2c_smbus_read_byte_data(data
->client
, VCNL4000_PROD_REV
);
172 dev_info(&client
->dev
, "VCNL4000 Ambient light/proximity sensor, Prod %02x, Rev: %02x\n",
173 ret
>> 4, ret
& 0xf);
175 indio_dev
->dev
.parent
= &client
->dev
;
176 indio_dev
->info
= &vcnl4000_info
;
177 indio_dev
->channels
= vcnl4000_channels
;
178 indio_dev
->num_channels
= ARRAY_SIZE(vcnl4000_channels
);
179 indio_dev
->name
= VCNL4000_DRV_NAME
;
180 indio_dev
->modes
= INDIO_DIRECT_MODE
;
182 ret
= iio_device_register(indio_dev
);
189 static int vcnl4000_remove(struct i2c_client
*client
)
191 iio_device_unregister(i2c_get_clientdata(client
));
195 static struct i2c_driver vcnl4000_driver
= {
197 .name
= VCNL4000_DRV_NAME
,
198 .owner
= THIS_MODULE
,
200 .probe
= vcnl4000_probe
,
201 .remove
= vcnl4000_remove
,
202 .id_table
= vcnl4000_id
,
205 module_i2c_driver(vcnl4000_driver
);
207 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
208 MODULE_DESCRIPTION("Vishay VCNL4000 proximity/ambient light sensor driver");
209 MODULE_LICENSE("GPL");