// SPDX-License-Identifier: GPL-2.0-only
|
/*
|
* vl6180.c - Support for STMicroelectronics VL6180 ALS, range and proximity
|
* sensor
|
*
|
* Copyright 2017 Peter Meerwald-Stadler <pmeerw@pmeerw.net>
|
* Copyright 2017 Manivannan Sadhasivam <manivannanece23@gmail.com>
|
*
|
* IIO driver for VL6180 (7-bit I2C slave address 0x29)
|
*
|
* Range: 0 to 100mm
|
* ALS: < 1 Lux up to 100 kLux
|
* IR: 850nm
|
*
|
* TODO: threshold events, continuous mode
|
*/
|
|
#include <linux/module.h>
|
#include <linux/mod_devicetable.h>
|
#include <linux/i2c.h>
|
#include <linux/mutex.h>
|
#include <linux/err.h>
|
#include <linux/of.h>
|
#include <linux/delay.h>
|
#include <linux/util_macros.h>
|
|
#include <linux/iio/iio.h>
|
#include <linux/iio/sysfs.h>
|
#include <linux/gpio.h>
|
#include <linux/of_gpio.h>
|
#include <linux/interrupt.h>
|
#include <linux/iio/triggered_buffer.h>
|
#include <linux/iio/kfifo_buf.h>
|
#include <linux/iio/buffer.h>
|
|
#define VL6180_DRV_NAME "vl6180"
|
|
/* Device identification register and value */
|
#define VL6180_MODEL_ID 0x000
|
#define VL6180_MODEL_ID_VAL 0xb4
|
|
/* Configuration registers */
|
#define VL6180_SYS_MODE_GPIO1 0x011
|
#define VL6180_INTR_CONFIG 0x014
|
#define VL6180_INTR_CLEAR 0x015
|
#define VL6180_OUT_OF_RESET 0x016
|
#define VL6180_HOLD 0x017
|
#define VL6180_RANGE_START 0x018
|
#define VL6180_RANGE_INTER_MES_PERIOD 0x01b
|
#define VL6180_ALS_START 0x038
|
#define VL6180_ALS_THRESH_HIGH 0x03a
|
#define VL6180_ALS_THRESH_LOW 0x03c
|
#define VL6180_ALS_INTER_MES_PERIOD 0x03e
|
#define VL6180_ALS_GAIN 0x03f
|
#define VL6180_ALS_IT 0x040
|
|
/* Status registers */
|
#define VL6180_RANGE_STATUS 0x04d
|
#define VL6180_ALS_STATUS 0x04e
|
#define VL6180_INTR_STATUS 0x04f
|
|
/* Result value registers */
|
#define VL6180_ALS_VALUE 0x050
|
#define VL6180_RANGE_VALUE 0x062
|
#define VL6180_RANGE_RATE 0x066
|
|
#define VL6180_RANGE_THRESH_HIGH 0x019
|
#define VL6180_RANGE_THRESH_LOW 0x01a
|
#define VL6180_RANGE_MAX_CONVERGENCE_TIME 0x01c
|
#define VL6180_RANGE_CROSSTALK_COMPENSATION_RATE 0x01e
|
#define VL6180_RANGE_PART_TO_PART_RANGE_OFFSET 0x024
|
#define VL6180_RANGE_RANGE_IGNORE_VALID_HEIGHT 0x025
|
#define VL6180_RANGE_RANGE_IGNORE_THRESHOLD 0x026
|
#define VL6180_RANGE_MAX_AMBIENT_LEVEL_MULT 0x02c
|
#define VL6180_RANGE_RANGE_CHECK_ENABLES 0x02d
|
#define VL6180_RANGE_VHV_RECALIBRATE 0x02e
|
#define VL6180_RANGE_VHV_REPEAT_RATE 0x031
|
#define VL6180_READOUT_AVERAGING_SAMPLE_PERIOD 0x10a
|
|
/* bits of the SYS_MODE_GPIO1 register */
|
#define VL6180_SYS_GPIO1_POLARITY BIT(5) /* active high */
|
#define VL6180_SYS_GPIO1_SELECT BIT(4) /* configure GPIO interrupt output */
|
|
/* bits of the RANGE_START and ALS_START register */
|
#define VL6180_MODE_CONT BIT(1) /* continuous mode */
|
#define VL6180_STARTSTOP BIT(0) /* start measurement, auto-reset */
|
|
/* bits of the INTR_STATUS and INTR_CONFIG register */
|
#define VL6180_ALS_LEVEL_LOW BIT(3)
|
#define VL6180_ALS_LEVEL_HIGH BIT(4)
|
#define VL6180_ALS_OUT_OF_WINDOW (BIT(3) | BIT(4))
|
#define VL6180_ALS_READY BIT(5)
|
#define VL6180_RANGE_LEVEL_LOW BIT(0)
|
#define VL6180_RANGE_LEVEL_HIGH BIT(1)
|
#define VL6180_RANGE_OUT_OF_WINDOW (BIT(0) | BIT(1))
|
#define VL6180_RANGE_READY BIT(2)
|
#define VL6180_INT_RANGE_GPIO_MASK GENMASK(2, 0)
|
#define VL6180_INT_ALS_GPIO_MASK GENMASK(5, 3)
|
#define VL6180_INT_ERR_GPIO_MASK GENMASK(7, 6)
|
|
/* bits of the INTR_CLEAR register */
|
#define VL6180_CLEAR_ERROR BIT(2)
|
#define VL6180_CLEAR_ALS BIT(1)
|
#define VL6180_CLEAR_RANGE BIT(0)
|
|
/* bits of the HOLD register */
|
#define VL6180_HOLD_ON BIT(0)
|
|
/* default value for the ALS_IT register */
|
#define VL6180_ALS_IT_100 0x63 /* 100 ms */
|
|
/* values for the ALS_GAIN register */
|
#define VL6180_ALS_GAIN_1 0x46
|
#define VL6180_ALS_GAIN_1_25 0x45
|
#define VL6180_ALS_GAIN_1_67 0x44
|
#define VL6180_ALS_GAIN_2_5 0x43
|
#define VL6180_ALS_GAIN_5 0x42
|
#define VL6180_ALS_GAIN_10 0x41
|
#define VL6180_ALS_GAIN_20 0x40
|
#define VL6180_ALS_GAIN_40 0x47
|
|
struct vl6180_data {
|
struct i2c_client *client;
|
struct mutex lock;
|
unsigned int als_gain_milli;
|
unsigned int als_it_ms;
|
struct gpio_desc *avdd;
|
struct gpio_desc *chip_enable;
|
|
/* Ensure natural alignment of timestamp */
|
struct {
|
u16 channels[3];
|
u16 reserved;
|
s64 ts;
|
} scan;
|
};
|
|
enum { VL6180_ALS, VL6180_RANGE, VL6180_PROX };
|
|
/**
|
* struct vl6180_chan_regs - Registers for accessing channels
|
* @drdy_mask: Data ready bit in status register
|
* @start_reg: Conversion start register
|
* @value_reg: Result value register
|
* @word: Register word length
|
*/
|
struct vl6180_chan_regs {
|
u8 drdy_mask;
|
u16 start_reg, value_reg;
|
bool word;
|
};
|
|
static const struct vl6180_chan_regs vl6180_chan_regs_table[] = {
|
[VL6180_ALS] = {
|
.drdy_mask = VL6180_ALS_READY,
|
.start_reg = VL6180_ALS_START,
|
.value_reg = VL6180_ALS_VALUE,
|
.word = true,
|
},
|
[VL6180_RANGE] = {
|
.drdy_mask = VL6180_RANGE_READY,
|
.start_reg = VL6180_RANGE_START,
|
.value_reg = VL6180_RANGE_VALUE,
|
.word = false,
|
},
|
[VL6180_PROX] = {
|
.drdy_mask = VL6180_RANGE_READY,
|
.start_reg = VL6180_RANGE_START,
|
.value_reg = VL6180_RANGE_RATE,
|
.word = true,
|
},
|
};
|
|
/**
|
* struct vl6180_custom_data - Data for custom initialization
|
* @reg: Register
|
* @val: Value
|
*/
|
struct vl6180_custom_data {
|
u16 reg;
|
u8 val;
|
};
|
|
static const struct vl6180_custom_data vl6180_custom_data_table[] = {
|
{ .reg = 0x207, .val = 0x01, },
|
{ .reg = 0x208, .val = 0x01, },
|
{ .reg = 0x096, .val = 0x00, },
|
{ .reg = 0x097, .val = 0xfd, },
|
{ .reg = 0x0e3, .val = 0x00, },
|
{ .reg = 0x0e4, .val = 0x04, },
|
{ .reg = 0x0e5, .val = 0x02, },
|
{ .reg = 0x0e6, .val = 0x01, },
|
{ .reg = 0x0e7, .val = 0x03, },
|
{ .reg = 0x0f5, .val = 0x02, },
|
{ .reg = 0x0d9, .val = 0x05, },
|
{ .reg = 0x0db, .val = 0xce, },
|
{ .reg = 0x0dc, .val = 0x03, },
|
{ .reg = 0x0dd, .val = 0xf8, },
|
{ .reg = 0x09f, .val = 0x00, },
|
{ .reg = 0x0a3, .val = 0x3c, },
|
{ .reg = 0x0b7, .val = 0x00, },
|
{ .reg = 0x0bb, .val = 0x3c, },
|
{ .reg = 0x0b2, .val = 0x09, },
|
{ .reg = 0x0ca, .val = 0x09, },
|
{ .reg = 0x198, .val = 0x01, },
|
{ .reg = 0x1b0, .val = 0x17, },
|
{ .reg = 0x1ad, .val = 0x00, },
|
{ .reg = 0x0ff, .val = 0x05, },
|
{ .reg = 0x100, .val = 0x05, },
|
{ .reg = 0x199, .val = 0x05, },
|
{ .reg = 0x1a6, .val = 0x1b, },
|
{ .reg = 0x1ac, .val = 0x3e, },
|
{ .reg = 0x1a7, .val = 0x1f, },
|
{ .reg = 0x030, .val = 0x00, },
|
};
|
|
static int vl6180_read(struct i2c_client *client, u16 cmd, void *databuf,
|
u8 len)
|
{
|
__be16 cmdbuf = cpu_to_be16(cmd);
|
struct i2c_msg msgs[2] = {
|
{ .addr = client->addr, .len = sizeof(cmdbuf), .buf = (u8 *) &cmdbuf },
|
{ .addr = client->addr, .len = len, .buf = databuf,
|
.flags = I2C_M_RD } };
|
int ret;
|
|
ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
|
if (ret < 0)
|
dev_err(&client->dev, "failed reading register 0x%04x\n", cmd);
|
|
return ret;
|
}
|
|
static int vl6180_read_byte(struct i2c_client *client, u16 cmd)
|
{
|
u8 data;
|
int ret;
|
|
ret = vl6180_read(client, cmd, &data, sizeof(data));
|
if (ret < 0)
|
return ret;
|
|
return data;
|
}
|
|
static int vl6180_read_word(struct i2c_client *client, u16 cmd)
|
{
|
__be16 data;
|
int ret;
|
|
ret = vl6180_read(client, cmd, &data, sizeof(data));
|
if (ret < 0)
|
return ret;
|
|
return be16_to_cpu(data);
|
}
|
|
static int vl6180_write_byte(struct i2c_client *client, u16 cmd, u8 val)
|
{
|
u8 buf[3];
|
struct i2c_msg msgs[1] = {
|
{ .addr = client->addr, .len = sizeof(buf), .buf = (u8 *) &buf } };
|
int ret;
|
|
buf[0] = cmd >> 8;
|
buf[1] = cmd & 0xff;
|
buf[2] = val;
|
|
ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
|
if (ret < 0) {
|
dev_err(&client->dev, "failed writing register 0x%04x\n", cmd);
|
return ret;
|
}
|
|
return 0;
|
}
|
|
static int vl6180_write_word(struct i2c_client *client, u16 cmd, u16 val)
|
{
|
__be16 buf[2];
|
struct i2c_msg msgs[1] = {
|
{ .addr = client->addr, .len = sizeof(buf), .buf = (u8 *) &buf } };
|
int ret;
|
|
buf[0] = cpu_to_be16(cmd);
|
buf[1] = cpu_to_be16(val);
|
|
ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
|
if (ret < 0) {
|
dev_err(&client->dev, "failed writing register 0x%04x\n", cmd);
|
return ret;
|
}
|
|
return 0;
|
}
|
|
static int vl6180_measure(struct vl6180_data *data, int addr)
|
{
|
struct i2c_client *client = data->client;
|
int tries = 20, ret;
|
u16 value;
|
|
mutex_lock(&data->lock);
|
/* Start single shot measurement */
|
ret = vl6180_write_byte(client,
|
vl6180_chan_regs_table[addr].start_reg, VL6180_STARTSTOP);
|
if (ret < 0)
|
goto fail;
|
|
while (tries--) {
|
ret = vl6180_read_byte(client, VL6180_INTR_STATUS);
|
if (ret < 0)
|
goto fail;
|
|
if (ret & vl6180_chan_regs_table[addr].drdy_mask)
|
break;
|
msleep(20);
|
}
|
|
if (tries < 0) {
|
ret = -EIO;
|
goto fail;
|
}
|
|
/* Read result value from appropriate registers */
|
ret = vl6180_chan_regs_table[addr].word ?
|
vl6180_read_word(client, vl6180_chan_regs_table[addr].value_reg) :
|
vl6180_read_byte(client, vl6180_chan_regs_table[addr].value_reg);
|
if (ret < 0)
|
goto fail;
|
value = ret;
|
|
/* Clear the interrupt flag after data read */
|
ret = vl6180_write_byte(client, VL6180_INTR_CLEAR,
|
VL6180_CLEAR_ERROR | VL6180_CLEAR_ALS | VL6180_CLEAR_RANGE);
|
if (ret < 0)
|
goto fail;
|
|
ret = value;
|
|
fail:
|
mutex_unlock(&data->lock);
|
|
return ret;
|
}
|
|
static const struct iio_chan_spec vl6180_channels[] = {
|
{
|
.type = IIO_LIGHT,
|
.address = VL6180_ALS,
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
|
BIT(IIO_CHAN_INFO_INT_TIME) |
|
BIT(IIO_CHAN_INFO_SCALE) |
|
BIT(IIO_CHAN_INFO_HARDWAREGAIN),
|
.scan_index = 0,
|
.scan_type = {
|
.sign = 'u',
|
.realbits = 16,
|
.storagebits = 16,
|
}
|
}, {
|
.type = IIO_DISTANCE,
|
.address = VL6180_RANGE,
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
|
BIT(IIO_CHAN_INFO_SCALE),
|
.scan_index = 1,
|
.scan_type = {
|
.sign = 'u',
|
.realbits = 16,
|
.storagebits = 16,
|
}
|
}, {
|
.type = IIO_PROXIMITY,
|
.address = VL6180_PROX,
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
|
.scan_index = 2,
|
.scan_type = {
|
.sign = 'u',
|
.realbits = 16,
|
.storagebits = 16,
|
}
|
},
|
IIO_CHAN_SOFT_TIMESTAMP(3),
|
};
|
|
/*
|
* Available Ambient Light Sensor gain settings, 1/1000th, and
|
* corresponding setting for the VL6180_ALS_GAIN register
|
*/
|
static const int vl6180_als_gain_tab[8] = {
|
1000, 1250, 1670, 2500, 5000, 10000, 20000, 40000
|
};
|
static const u8 vl6180_als_gain_tab_bits[8] = {
|
VL6180_ALS_GAIN_1, VL6180_ALS_GAIN_1_25,
|
VL6180_ALS_GAIN_1_67, VL6180_ALS_GAIN_2_5,
|
VL6180_ALS_GAIN_5, VL6180_ALS_GAIN_10,
|
VL6180_ALS_GAIN_20, VL6180_ALS_GAIN_40
|
};
|
|
static int vl6180_read_raw(struct iio_dev *indio_dev,
|
struct iio_chan_spec const *chan,
|
int *val, int *val2, long mask)
|
{
|
struct vl6180_data *data = iio_priv(indio_dev);
|
int ret;
|
|
switch (mask) {
|
case IIO_CHAN_INFO_RAW:
|
ret = vl6180_measure(data, chan->address);
|
if (ret < 0)
|
return ret;
|
*val = ret;
|
|
return IIO_VAL_INT;
|
case IIO_CHAN_INFO_INT_TIME:
|
*val = data->als_it_ms;
|
*val2 = 1000;
|
|
return IIO_VAL_FRACTIONAL;
|
|
case IIO_CHAN_INFO_SCALE:
|
switch (chan->type) {
|
case IIO_LIGHT:
|
/* one ALS count is 0.32 Lux @ gain 1, IT 100 ms */
|
*val = 32000; /* 0.32 * 1000 * 100 */
|
*val2 = data->als_gain_milli * data->als_it_ms;
|
|
return IIO_VAL_FRACTIONAL;
|
|
case IIO_DISTANCE:
|
*val = 0; /* sensor reports mm, scale to meter */
|
*val2 = 1000;
|
break;
|
default:
|
return -EINVAL;
|
}
|
|
return IIO_VAL_INT_PLUS_MICRO;
|
case IIO_CHAN_INFO_HARDWAREGAIN:
|
*val = data->als_gain_milli;
|
*val2 = 1000;
|
|
return IIO_VAL_FRACTIONAL;
|
|
default:
|
return -EINVAL;
|
}
|
}
|
|
static IIO_CONST_ATTR(als_gain_available, "1 1.25 1.67 2.5 5 10 20 40");
|
|
static struct attribute *vl6180_attributes[] = {
|
&iio_const_attr_als_gain_available.dev_attr.attr,
|
NULL
|
};
|
|
static const struct attribute_group vl6180_attribute_group = {
|
.attrs = vl6180_attributes,
|
};
|
|
/* HOLD is needed before updating any config registers */
|
static int vl6180_hold(struct vl6180_data *data, bool hold)
|
{
|
return vl6180_write_byte(data->client, VL6180_HOLD,
|
hold ? VL6180_HOLD_ON : 0);
|
}
|
|
static int vl6180_set_als_gain(struct vl6180_data *data, int val, int val2)
|
{
|
int i, ret, gain;
|
|
if (val < 1 || val > 40)
|
return -EINVAL;
|
|
gain = (val * 1000000 + val2) / 1000;
|
if (gain < 1 || gain > 40000)
|
return -EINVAL;
|
|
i = find_closest(gain, vl6180_als_gain_tab,
|
ARRAY_SIZE(vl6180_als_gain_tab));
|
|
mutex_lock(&data->lock);
|
ret = vl6180_hold(data, true);
|
if (ret < 0)
|
goto fail;
|
|
ret = vl6180_write_byte(data->client, VL6180_ALS_GAIN,
|
vl6180_als_gain_tab_bits[i]);
|
|
if (ret >= 0)
|
data->als_gain_milli = vl6180_als_gain_tab[i];
|
|
fail:
|
vl6180_hold(data, false);
|
mutex_unlock(&data->lock);
|
return ret;
|
}
|
|
static int vl6180_set_it(struct vl6180_data *data, int val, int val2)
|
{
|
int ret, it_ms;
|
|
it_ms = (val2 + 500) / 1000; /* round to ms */
|
if (val != 0 || it_ms < 1 || it_ms > 512)
|
return -EINVAL;
|
|
mutex_lock(&data->lock);
|
ret = vl6180_hold(data, true);
|
if (ret < 0)
|
goto fail;
|
|
ret = vl6180_write_word(data->client, VL6180_ALS_IT, it_ms - 1);
|
|
if (ret >= 0)
|
data->als_it_ms = it_ms;
|
|
fail:
|
vl6180_hold(data, false);
|
mutex_unlock(&data->lock);
|
|
return ret;
|
}
|
|
static int vl6180_write_raw(struct iio_dev *indio_dev,
|
struct iio_chan_spec const *chan,
|
int val, int val2, long mask)
|
{
|
struct vl6180_data *data = iio_priv(indio_dev);
|
|
switch (mask) {
|
case IIO_CHAN_INFO_INT_TIME:
|
return vl6180_set_it(data, val, val2);
|
|
case IIO_CHAN_INFO_HARDWAREGAIN:
|
if (chan->type != IIO_LIGHT)
|
return -EINVAL;
|
|
return vl6180_set_als_gain(data, val, val2);
|
default:
|
return -EINVAL;
|
}
|
}
|
|
static const struct iio_info vl6180_info = {
|
.read_raw = vl6180_read_raw,
|
.write_raw = vl6180_write_raw,
|
.attrs = &vl6180_attribute_group,
|
};
|
|
static int vl6180_power_enable(struct vl6180_data *data)
|
{
|
/* Enable power supply. */
|
if (!IS_ERR_OR_NULL(data->avdd))
|
gpiod_set_value_cansleep(data->avdd, 1);
|
|
/* Power-up default is chip enable (CE). */
|
if (!IS_ERR_OR_NULL(data->chip_enable)) {
|
gpiod_set_value_cansleep(data->chip_enable, 0);
|
usleep_range(500, 1000);
|
gpiod_set_value_cansleep(data->chip_enable, 1);
|
}
|
|
return 0;
|
}
|
|
static int vl6180_custom_init(struct vl6180_data *data)
|
{
|
struct i2c_client *client = data->client;
|
int ret;
|
int i;
|
|
/* REGISTER_TUNING_SR03_270514_CustomerView.txt */
|
for (i = 0; i < ARRAY_SIZE(vl6180_custom_data_table); ++i) {
|
ret = vl6180_write_byte(client,
|
vl6180_custom_data_table[i].reg,
|
vl6180_custom_data_table[i].val);
|
|
if (ret < 0)
|
break;
|
}
|
|
return ret;
|
}
|
|
static int vl6180_range_init(struct vl6180_data *data)
|
{
|
struct i2c_client *client = data->client;
|
int ret;
|
u8 enables;
|
u8 offset;
|
u8 xtalk = 3;
|
|
/* Enables polling for ‘New Sample ready’ when measurement completes */
|
ret = vl6180_write_byte(client, VL6180_SYS_MODE_GPIO1,
|
(VL6180_SYS_GPIO1_POLARITY |
|
VL6180_SYS_GPIO1_SELECT));
|
if (ret < 0)
|
goto out;
|
|
/* Set the averaging sample period (compromise between lower noise and
|
* increased execution time), 0x30 equals to 4.3 ms.
|
*/
|
ret = vl6180_write_byte(client, VL6180_READOUT_AVERAGING_SAMPLE_PERIOD,
|
0x30);
|
if (ret < 0)
|
goto out;
|
|
/* Sets the # of range measurements after which auto calibration of
|
* system is performed
|
*/
|
ret = vl6180_write_byte(client, VL6180_RANGE_VHV_REPEAT_RATE, 0xff);
|
if (ret < 0)
|
goto out;
|
|
/* Perform a single temperature calibration of the ranging sensor */
|
ret = vl6180_write_byte(client, VL6180_RANGE_VHV_RECALIBRATE, 0x01);
|
if (ret < 0)
|
goto out;
|
|
/* Set SNR limit to 0.06 */
|
ret = vl6180_write_byte(client, VL6180_RANGE_MAX_AMBIENT_LEVEL_MULT,
|
0xff);
|
if (ret < 0)
|
goto out;
|
|
/* Set default ranging inter-measurement period to 100ms */
|
ret = vl6180_write_byte(client, VL6180_RANGE_INTER_MES_PERIOD, 0x09);
|
if (ret < 0)
|
goto out;
|
|
/* Copy registers */
|
/* NOTE: 0x0da, 0x027, 0x0db, 0x028, 0x0dc, 0x029 and 0x0dd are
|
* unavailable on the datasheet.
|
*/
|
ret = vl6180_read_byte(client, VL6180_RANGE_RANGE_IGNORE_THRESHOLD);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_write_byte(client, 0x0da, ret);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_read_byte(client, 0x027);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_write_byte(client, 0x0db, ret);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_read_byte(client, 0x028);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_write_byte(client, 0x0dc, ret);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_read_byte(client, 0x029);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_write_byte(client, 0x0dd, ret);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_write_byte(client, VL6180_RANGE_MAX_CONVERGENCE_TIME, 0x32);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_read_byte(client, VL6180_RANGE_RANGE_CHECK_ENABLES);
|
if (ret < 0)
|
goto out;
|
|
/* Disable early convergence */
|
enables = ret & 0xfe;
|
ret = vl6180_write_byte(client, VL6180_RANGE_RANGE_CHECK_ENABLES, enables);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_write_byte(client, VL6180_RANGE_THRESH_HIGH, 0xc8);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_write_byte(client, VL6180_RANGE_THRESH_LOW, 0x00);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_write_byte(client, VL6180_ALS_IT, VL6180_ALS_IT_100);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_write_byte(client, VL6180_ALS_INTER_MES_PERIOD, 0x13);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_write_byte(client, VL6180_ALS_GAIN, VL6180_ALS_GAIN_1);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_write_byte(client, VL6180_ALS_THRESH_LOW, 0x00);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_write_byte(client, VL6180_ALS_THRESH_HIGH, 0xff);
|
if (ret < 0)
|
goto out;
|
|
/* Cover glass ignore */
|
ret = vl6180_write_byte(client,
|
VL6180_RANGE_RANGE_IGNORE_VALID_HEIGHT, 0xff);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_read_byte(client, VL6180_RANGE_PART_TO_PART_RANGE_OFFSET);
|
if (ret < 0)
|
goto out;
|
|
/* Apply default calibration on part to part offset */
|
offset = ret / 4;
|
ret = vl6180_write_byte(client, VL6180_RANGE_PART_TO_PART_RANGE_OFFSET,
|
offset);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_write_byte(client,
|
VL6180_RANGE_CROSSTALK_COMPENSATION_RATE,
|
0x00);
|
if (ret < 0)
|
goto out;
|
|
ret = vl6180_write_byte(client, 0x01f, xtalk);
|
|
out:
|
return ret;
|
}
|
|
static int vl6180_init(struct vl6180_data *data)
|
{
|
struct i2c_client *client = data->client;
|
int ret;
|
|
ret = vl6180_power_enable(data);
|
if (ret) {
|
dev_err(&client->dev, "failed to configure power\n");
|
return ret;
|
}
|
|
/*
|
* After the MCU boot sequence the device enters software standby,
|
* host initialization can commence immediately after entering
|
* software standby.
|
*/
|
usleep_range(500, 1000);
|
|
ret = vl6180_read_byte(client, VL6180_MODEL_ID);
|
if (ret < 0)
|
return ret;
|
|
if (ret != VL6180_MODEL_ID_VAL) {
|
dev_err(&client->dev, "invalid model ID %02x\n", ret);
|
return -ENODEV;
|
}
|
|
ret = vl6180_hold(data, true);
|
if (ret < 0)
|
return ret;
|
|
ret = vl6180_read_byte(client, VL6180_OUT_OF_RESET);
|
if (ret < 0)
|
return ret;
|
|
/*
|
* Detect false reset condition here. This bit is always set when the
|
* system comes out of reset.
|
*/
|
if (ret != 0x01)
|
dev_info(&client->dev, "device is not fresh out of reset\n");
|
|
/* ALS integration time: 100ms */
|
data->als_it_ms = 100;
|
ret = vl6180_write_word(client, VL6180_ALS_IT, VL6180_ALS_IT_100);
|
if (ret < 0)
|
return ret;
|
|
/* ALS gain: 1 */
|
data->als_gain_milli = 1000;
|
ret = vl6180_write_byte(client, VL6180_ALS_GAIN, VL6180_ALS_GAIN_1);
|
if (ret < 0)
|
return ret;
|
|
ret = vl6180_custom_init(data);
|
if (ret < 0)
|
return ret;
|
|
ret = vl6180_range_init(data);
|
if (ret < 0)
|
return ret;
|
|
ret = vl6180_write_byte(client, VL6180_RANGE_START,
|
(VL6180_STARTSTOP | VL6180_MODE_CONT));
|
if (ret < 0)
|
return ret;
|
|
ret = vl6180_write_byte(client, VL6180_OUT_OF_RESET, 0x00);
|
if (ret < 0)
|
return ret;
|
|
return vl6180_hold(data, false);
|
}
|
|
static irqreturn_t vl6180_irq_thread(int irq, void *priv)
|
{
|
struct vl6180_data *data = priv;
|
struct i2c_client *client = data->client;
|
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
int ret;
|
u8 val = 0;
|
|
ret = vl6180_read_byte(client, VL6180_INTR_STATUS);
|
if (ret < 0)
|
goto out;
|
|
if (ret & VL6180_INT_ALS_GPIO_MASK)
|
val |= VL6180_CLEAR_ALS;
|
|
if (ret & VL6180_INT_RANGE_GPIO_MASK)
|
val |= VL6180_CLEAR_RANGE;
|
|
if (ret & VL6180_INT_ERR_GPIO_MASK)
|
val |= VL6180_CLEAR_ERROR;
|
|
vl6180_write_byte(client, VL6180_INTR_CLEAR, val);
|
|
ret = vl6180_read_word(client, VL6180_ALS_VALUE);
|
if (ret < 0)
|
goto out;
|
data->scan.channels[VL6180_ALS] = ret;
|
|
ret = vl6180_read_byte(client, VL6180_RANGE_VALUE);
|
if (ret < 0)
|
goto out;
|
data->scan.channels[VL6180_RANGE] = ret;
|
|
ret = vl6180_read_word(client, VL6180_RANGE_RATE);
|
if (ret < 0)
|
goto out;
|
data->scan.channels[VL6180_PROX] = ret;
|
|
iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
|
ktime_get_boottime_ns());
|
|
out:
|
return IRQ_HANDLED;
|
}
|
|
static int vl6180_buffer_preenable(struct iio_dev *indio_dev)
|
{
|
struct vl6180_data *data = iio_priv(indio_dev);
|
u8 val;
|
int ret;
|
|
ret = vl6180_read_byte(data->client, VL6180_INTR_CONFIG);
|
if (ret < 0)
|
return ret;
|
|
/* Enable ALS and Range ready interrupts */
|
val = ret | VL6180_ALS_READY | VL6180_RANGE_READY;
|
ret = vl6180_write_byte(data->client, VL6180_INTR_CONFIG, val);
|
|
return ret;
|
}
|
|
static int vl6180_buffer_postdisable(struct iio_dev *indio_dev)
|
{
|
struct vl6180_data *data = iio_priv(indio_dev);
|
u8 val;
|
int ret;
|
|
ret = vl6180_read_byte(data->client, VL6180_INTR_CONFIG);
|
if (ret < 0)
|
return ret;
|
|
/* Disable ALS and Range ready interrupts */
|
val = ret & ~(VL6180_ALS_READY | VL6180_RANGE_READY);
|
ret = vl6180_write_byte(data->client, VL6180_INTR_CONFIG, val);
|
|
return ret;
|
}
|
|
static const struct iio_buffer_setup_ops vl6180_buffer_setup_ops = {
|
.preenable = vl6180_buffer_preenable,
|
.postdisable = vl6180_buffer_postdisable,
|
};
|
|
static int vl6180_probe(struct i2c_client *client,
|
const struct i2c_device_id *id)
|
{
|
struct vl6180_data *data;
|
struct iio_dev *indio_dev;
|
struct iio_buffer *buffer;
|
u32 type;
|
int ret;
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
|
if (!indio_dev)
|
return -ENOMEM;
|
|
data = iio_priv(indio_dev);
|
i2c_set_clientdata(client, indio_dev);
|
data->client = client;
|
mutex_init(&data->lock);
|
|
indio_dev->info = &vl6180_info;
|
indio_dev->channels = vl6180_channels;
|
indio_dev->num_channels = ARRAY_SIZE(vl6180_channels);
|
indio_dev->name = VL6180_DRV_NAME;
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
/*
|
* NOTE: If the power is controlled by gpio, the power
|
* configuration should match the power-up timing.
|
*/
|
data->avdd = devm_gpiod_get_optional(&client->dev, "avdd",
|
GPIOD_OUT_HIGH);
|
data->chip_enable = devm_gpiod_get_optional(&client->dev, "chip-enable",
|
GPIOD_OUT_HIGH);
|
|
ret = vl6180_init(data);
|
if (ret < 0)
|
return ret;
|
|
if (client->irq) {
|
buffer = devm_iio_kfifo_allocate(&client->dev);
|
if (!buffer)
|
return -ENOMEM;
|
|
iio_device_attach_buffer(indio_dev, buffer);
|
indio_dev->modes |= INDIO_BUFFER_SOFTWARE;
|
indio_dev->setup_ops = &vl6180_buffer_setup_ops;
|
|
type = irqd_get_trigger_type(irq_get_irq_data(client->irq));
|
ret = devm_request_threaded_irq(&client->dev, client->irq,
|
NULL, vl6180_irq_thread,
|
type | IRQF_ONESHOT, "vl6180",
|
data);
|
if (ret) {
|
dev_err(&client->dev,
|
"failed to request vl6180 IRQ\n");
|
return ret;
|
}
|
}
|
|
return devm_iio_device_register(&client->dev, indio_dev);
|
}
|
|
static const struct of_device_id vl6180_of_match[] = {
|
{ .compatible = "st,vl6180", },
|
{ },
|
};
|
MODULE_DEVICE_TABLE(of, vl6180_of_match);
|
|
static const struct i2c_device_id vl6180_id[] = {
|
{ "vl6180", 0 },
|
{ }
|
};
|
MODULE_DEVICE_TABLE(i2c, vl6180_id);
|
|
static struct i2c_driver vl6180_driver = {
|
.driver = {
|
.name = VL6180_DRV_NAME,
|
.of_match_table = vl6180_of_match,
|
},
|
.probe = vl6180_probe,
|
.id_table = vl6180_id,
|
};
|
|
module_i2c_driver(vl6180_driver);
|
|
MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw@pmeerw.net>");
|
MODULE_AUTHOR("Manivannan Sadhasivam <manivannanece23@gmail.com>");
|
MODULE_DESCRIPTION("STMicro VL6180 ALS, range and proximity sensor driver");
|
MODULE_LICENSE("GPL");
|
