Re: [PATCH v2 11/11] staging: iio: tsl2x7x/tsl2772: move out of staging

Brian Masney
2018-05-04T02:56:54Z

Hey Jonathan,

I intentionally didn't run git format-patch with the --no-renames since
patch 10 renamed the driver. Here is the .[ch] files included inline to
make your review easier.

Brian

tsl2772.c:

// SPDX-License-Identifier: GPL-2.0+
/*
* Device driver for monitoring ambient light intensity in (lux) and proximity
* detection (prox) for the TAOS TSL2571, TSL2671, TMD2671, TSL2771, TMD2771,
* TSL2572, TSL2672, TMD2672, TSL2772, and TMD2772 devices.
*
* Copyright (c) 2012, TAOS Corporation.
* Copyright (c) 2017-2018 Brian Masney <masneyb@onstation.org>
*/

#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/iio/events.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/platform_data/tsl2772.h>

/* Cal defs */
#define PROX_STAT_CAL 0
#define PROX_STAT_SAMP 1
#define MAX_SAMPLES_CAL 200

/* TSL2772 Device ID */
#define TRITON_ID 0x00
#define SWORDFISH_ID 0x30
#define HALIBUT_ID 0x20

/* Lux calculation constants */
#define TSL2772_LUX_CALC_OVER_FLOW 65535

/*
* TAOS Register definitions - Note: depending on device, some of these register
* are not used and the register address is benign.
*/

/* Register offsets */
#define TSL2772_MAX_CONFIG_REG 16

/* Device Registers and Masks */
#define TSL2772_CNTRL 0x00
#define TSL2772_ALS_TIME 0X01
#define TSL2772_PRX_TIME 0x02
#define TSL2772_WAIT_TIME 0x03
#define TSL2772_ALS_MINTHRESHLO 0X04
#define TSL2772_ALS_MINTHRESHHI 0X05
#define TSL2772_ALS_MAXTHRESHLO 0X06
#define TSL2772_ALS_MAXTHRESHHI 0X07
#define TSL2772_PRX_MINTHRESHLO 0X08
#define TSL2772_PRX_MINTHRESHHI 0X09
#define TSL2772_PRX_MAXTHRESHLO 0X0A
#define TSL2772_PRX_MAXTHRESHHI 0X0B
#define TSL2772_PERSISTENCE 0x0C
#define TSL2772_ALS_PRX_CONFIG 0x0D
#define TSL2772_PRX_COUNT 0x0E
#define TSL2772_GAIN 0x0F
#define TSL2772_NOTUSED 0x10
#define TSL2772_REVID 0x11
#define TSL2772_CHIPID 0x12
#define TSL2772_STATUS 0x13
#define TSL2772_ALS_CHAN0LO 0x14
#define TSL2772_ALS_CHAN0HI 0x15
#define TSL2772_ALS_CHAN1LO 0x16
#define TSL2772_ALS_CHAN1HI 0x17
#define TSL2772_PRX_LO 0x18
#define TSL2772_PRX_HI 0x19

/* tsl2772 cmd reg masks */
#define TSL2772_CMD_REG 0x80
#define TSL2772_CMD_SPL_FN 0x60
#define TSL2772_CMD_REPEAT_PROTO 0x00
#define TSL2772_CMD_AUTOINC_PROTO 0x20

#define TSL2772_CMD_PROX_INT_CLR 0X05
#define TSL2772_CMD_ALS_INT_CLR 0x06
#define TSL2772_CMD_PROXALS_INT_CLR 0X07

/* tsl2772 cntrl reg masks */
#define TSL2772_CNTL_ADC_ENBL 0x02
#define TSL2772_CNTL_PWR_ON 0x01

/* tsl2772 status reg masks */
#define TSL2772_STA_ADC_VALID 0x01
#define TSL2772_STA_PRX_VALID 0x02
#define TSL2772_STA_ADC_PRX_VALID (TSL2772_STA_ADC_VALID | \
TSL2772_STA_PRX_VALID)
#define TSL2772_STA_ALS_INTR 0x10
#define TSL2772_STA_PRX_INTR 0x20

/* tsl2772 cntrl reg masks */
#define TSL2772_CNTL_REG_CLEAR 0x00
#define TSL2772_CNTL_PROX_INT_ENBL 0X20
#define TSL2772_CNTL_ALS_INT_ENBL 0X10
#define TSL2772_CNTL_WAIT_TMR_ENBL 0X08
#define TSL2772_CNTL_PROX_DET_ENBL 0X04
#define TSL2772_CNTL_PWRON 0x01
#define TSL2772_CNTL_ALSPON_ENBL 0x03
#define TSL2772_CNTL_INTALSPON_ENBL 0x13
#define TSL2772_CNTL_PROXPON_ENBL 0x0F
#define TSL2772_CNTL_INTPROXPON_ENBL 0x2F

/* TAOS Device family members */
enum {
tsl2571,
tsl2671,
tmd2671,
tsl2771,
tmd2771,
tsl2572,
tsl2672,
tmd2672,
tsl2772,
tmd2772
};

enum {
TSL2772_CHIP_UNKNOWN = 0,
TSL2772_CHIP_WORKING = 1,
TSL2772_CHIP_SUSPENDED = 2
};

/* Per-device data */
struct tsl2772_als_info {
u16 als_ch0;
u16 als_ch1;
u16 lux;
};

struct tsl2772_chip_info {
int chan_table_elements;
struct iio_chan_spec channel_with_events[4];
struct iio_chan_spec channel_without_events[4];
const struct iio_info *info;
};

struct tsl2772_chip {
kernel_ulong_t id;
struct mutex prox_mutex;
struct mutex als_mutex;
struct i2c_client *client;
u16 prox_data;
struct tsl2772_als_info als_cur_info;
struct tsl2772_settings settings;
struct tsl2772_platform_data *pdata;
int als_gain_time_scale;
int als_saturation;
int tsl2772_chip_status;
u8 tsl2772_config[TSL2772_MAX_CONFIG_REG];
const struct tsl2772_chip_info *chip_info;
const struct iio_info *info;
s64 event_timestamp;
/*
* This structure is intentionally large to accommodate
* updates via sysfs.
* Sized to 9 = max 8 segments + 1 termination segment
*/
struct tsl2772_lux tsl2772_device_lux[TSL2772_MAX_LUX_TABLE_SIZE];
};

/*
* Different devices require different coefficents, and these numbers were
* derived from the 'Lux Equation' section of the various device datasheets.
* All of these coefficients assume a Glass Attenuation (GA) factor of 1.
* The coefficients are multiplied by 1000 to avoid floating point operations.
* The two rows in each table correspond to the Lux1 and Lux2 equations from
* the datasheets.
*/
static const struct tsl2772_lux tsl2x71_lux_table[TSL2772_DEF_LUX_TABLE_SZ] = {
{ 53000, 106000 },
{ 31800, 53000 },
{ 0, 0 },
};

static const struct tsl2772_lux tmd2x71_lux_table[TSL2772_DEF_LUX_TABLE_SZ] = {
{ 24000, 48000 },
{ 14400, 24000 },
{ 0, 0 },
};

static const struct tsl2772_lux tsl2x72_lux_table[TSL2772_DEF_LUX_TABLE_SZ] = {
{ 60000, 112200 },
{ 37800, 60000 },
{ 0, 0 },
};

static const struct tsl2772_lux tmd2x72_lux_table[TSL2772_DEF_LUX_TABLE_SZ] = {
{ 20000, 35000 },
{ 12600, 20000 },
{ 0, 0 },
};

static const struct tsl2772_lux *tsl2772_default_lux_table_group[] = {
[tsl2571] = tsl2x71_lux_table,
[tsl2671] = tsl2x71_lux_table,
[tmd2671] = tmd2x71_lux_table,
[tsl2771] = tsl2x71_lux_table,
[tmd2771] = tmd2x71_lux_table,
[tsl2572] = tsl2x72_lux_table,
[tsl2672] = tsl2x72_lux_table,
[tmd2672] = tmd2x72_lux_table,
[tsl2772] = tsl2x72_lux_table,
[tmd2772] = tmd2x72_lux_table,
};

static const struct tsl2772_settings tsl2772_default_settings = {
.als_time = 255, /* 2.72 / 2.73 ms */
.als_gain = 0,
.prox_time = 255, /* 2.72 / 2.73 ms */
.prox_gain = 0,
.wait_time = 255,
.als_prox_config = 0,
.als_gain_trim = 1000,
.als_cal_target = 150,
.als_persistence = 1,
.als_interrupt_en = false,
.als_thresh_low = 200,
.als_thresh_high = 256,
.prox_persistence = 1,
.prox_interrupt_en = false,
.prox_thres_low = 0,
.prox_thres_high = 512,
.prox_max_samples_cal = 30,
.prox_pulse_count = 8,
.prox_diode = TSL2772_DIODE1,
.prox_power = TSL2772_100_mA
};

static const s16 tsl2772_als_gain[] = {
1,
8,
16,
120
};

static const s16 tsl2772_prox_gain[] = {
1,
2,
4,
8
};

struct tsl2772_int_time {
int increment_us;
char *display_range;
};

static const struct tsl2772_int_time tsl2772_int_time[] = {
[tsl2571] = { 2720, "0.00272 - 0.696" },
[tsl2671] = { 2720, "0.00272 - 0.696" },
[tmd2671] = { 2720, "0.00272 - 0.696" },
[tsl2771] = { 2720, "0.00272 - 0.696" },
[tmd2771] = { 2720, "0.00272 - 0.696" },
[tsl2572] = { 2730, "0.00273 - 0.699" },
[tsl2672] = { 2730, "0.00273 - 0.699" },
[tmd2672] = { 2730, "0.00273 - 0.699" },
[tsl2772] = { 2730, "0.00273 - 0.699" },
[tmd2772] = { 2730, "0.00273 - 0.699" },
};

/* Channel variations */
enum {
ALS,
PRX,
ALSPRX,
PRX2,
ALSPRX2,
};

static const u8 device_channel_config[] = {
[tsl2571] = ALS,
[tsl2671] = PRX,
[tmd2671] = PRX,
[tsl2771] = ALSPRX,
[tmd2771] = ALSPRX,
[tsl2572] = ALS,
[tsl2672] = PRX2,
[tmd2672] = PRX2,
[tsl2772] = ALSPRX2,
[tmd2772] = ALSPRX2
};

static int tsl2772_read_status(struct tsl2772_chip *chip)
{
int ret;

ret = i2c_smbus_read_byte_data(chip->client,
TSL2772_CMD_REG | TSL2772_STATUS);
if (ret < 0)
dev_err(&chip->client->dev,
"%s: failed to read STATUS register: %d\n", __func__,
ret);

return ret;
}

static int tsl2772_write_control_reg(struct tsl2772_chip *chip, u8 data)
{
int ret;

ret = i2c_smbus_write_byte_data(chip->client,
TSL2772_CMD_REG | TSL2772_CNTRL, data);
if (ret < 0) {
dev_err(&chip->client->dev,
"%s: failed to write to control register %x: %d\n",
__func__, data, ret);
}

return ret;
}

static int tsl2772_read_autoinc_regs(struct tsl2772_chip *chip, int lower_reg,
int upper_reg)
{
u8 buf[2];
int ret;

ret = i2c_smbus_write_byte(chip->client,
TSL2772_CMD_REG | TSL2772_CMD_AUTOINC_PROTO |
lower_reg);
if (ret < 0) {
dev_err(&chip->client->dev,
"%s: failed to enable auto increment protocol: %d\n",
__func__, ret);
return ret;
}

ret = i2c_smbus_read_byte_data(chip->client,
TSL2772_CMD_REG | lower_reg);
if (ret < 0) {
dev_err(&chip->client->dev,
"%s: failed to read from register %x: %d\n", __func__,
lower_reg, ret);
return ret;
}
buf[0] = ret;

ret = i2c_smbus_read_byte_data(chip->client,
TSL2772_CMD_REG | upper_reg);
if (ret < 0) {
dev_err(&chip->client->dev,
"%s: failed to read from register %x: %d\n", __func__,
upper_reg, ret);
return ret;
}
buf[1] = ret;

ret = i2c_smbus_write_byte(chip->client,
TSL2772_CMD_REG | TSL2772_CMD_REPEAT_PROTO |
lower_reg);
if (ret < 0) {
dev_err(&chip->client->dev,
"%s: failed to enable repeated byte protocol: %d\n",
__func__, ret);
return ret;
}

return le16_to_cpup((const __le16 *)&buf[0]);
}

/**
* tsl2772_get_lux() - Reads and calculates current lux value.
* @indio_dev: pointer to IIO device
*
* The raw ch0 and ch1 values of the ambient light sensed in the last
* integration cycle are read from the device. The raw values are multiplied
* by a device-specific scale factor, and divided by the integration time and
* device gain. The code supports multiple lux equations through the lux table
* coefficients. A lux gain trim is applied to each lux equation, and then the
* maximum lux within the interval 0..65535 is selected.
*/
static int tsl2772_get_lux(struct iio_dev *indio_dev)
{
struct tsl2772_chip *chip = iio_priv(indio_dev);
struct tsl2772_lux *p;
int max_lux, ret;
bool overflow;

mutex_lock(&chip->als_mutex);

if (chip->tsl2772_chip_status != TSL2772_CHIP_WORKING) {
dev_err(&chip->client->dev, "%s: device is not enabled\n",
__func__);
ret = -EBUSY;
goto out_unlock;
}

ret = tsl2772_read_status(chip);
if (ret < 0)
goto out_unlock;

if (!(ret & TSL2772_STA_ADC_VALID)) {
dev_err(&chip->client->dev,
"%s: data not valid yet\n", __func__);
ret = chip->als_cur_info.lux; /* return LAST VALUE */
goto out_unlock;
}

ret = tsl2772_read_autoinc_regs(chip, TSL2772_ALS_CHAN0LO,
TSL2772_ALS_CHAN0HI);
if (ret < 0)
goto out_unlock;
chip->als_cur_info.als_ch0 = ret;

ret = tsl2772_read_autoinc_regs(chip, TSL2772_ALS_CHAN1LO,
TSL2772_ALS_CHAN1HI);
if (ret < 0)
goto out_unlock;
chip->als_cur_info.als_ch1 = ret;

if (chip->als_cur_info.als_ch0 >= chip->als_saturation) {
max_lux = TSL2772_LUX_CALC_OVER_FLOW;
goto update_struct_with_max_lux;
}

if (!chip->als_cur_info.als_ch0) {
/* have no data, so return LAST VALUE */
ret = chip->als_cur_info.lux;
goto out_unlock;
}

max_lux = 0;
overflow = false;
for (p = (struct tsl2772_lux *)chip->tsl2772_device_lux; p->ch0 != 0;
p++) {
int lux;

lux = ((chip->als_cur_info.als_ch0 * p->ch0) -
(chip->als_cur_info.als_ch1 * p->ch1)) /
chip->als_gain_time_scale;

/*
* The als_gain_trim can have a value within the range 250..4000
* and is a multiplier for the lux. A trim of 1000 makes no
* changes to the lux, less than 1000 scales it down, and
* greater than 1000 scales it up.
*/
lux = (lux * chip->settings.als_gain_trim) / 1000;

if (lux > TSL2772_LUX_CALC_OVER_FLOW) {
overflow = true;
continue;
}

max_lux = max(max_lux, lux);
}

if (overflow && max_lux == 0)
max_lux = TSL2772_LUX_CALC_OVER_FLOW;

update_struct_with_max_lux:
chip->als_cur_info.lux = max_lux;
ret = max_lux;

out_unlock:
mutex_unlock(&chip->als_mutex);

return ret;
}

/**
* tsl2772_get_prox() - Reads proximity data registers and updates
* chip->prox_data.
*
* @indio_dev: pointer to IIO device
*/
static int tsl2772_get_prox(struct iio_dev *indio_dev)
{
struct tsl2772_chip *chip = iio_priv(indio_dev);
int ret;

mutex_lock(&chip->prox_mutex);

ret = tsl2772_read_status(chip);
if (ret < 0)
goto prox_poll_err;

switch (chip->id) {
case tsl2571:
case tsl2671:
case tmd2671:
case tsl2771:
case tmd2771:
if (!(ret & TSL2772_STA_ADC_VALID)) {
ret = -EINVAL;
goto prox_poll_err;
}
break;
case tsl2572:
case tsl2672:
case tmd2672:
case tsl2772:
case tmd2772:
if (!(ret & TSL2772_STA_PRX_VALID)) {
ret = -EINVAL;
goto prox_poll_err;
}
break;
}

ret = tsl2772_read_autoinc_regs(chip, TSL2772_PRX_LO, TSL2772_PRX_HI);
if (ret < 0)
goto prox_poll_err;
chip->prox_data = ret;

prox_poll_err:
mutex_unlock(&chip->prox_mutex);

return ret;
}

/**
* tsl2772_defaults() - Populates the device nominal operating parameters
* with those provided by a 'platform' data struct or
* with prefined defaults.
*
* @chip: pointer to device structure.
*/
static void tsl2772_defaults(struct tsl2772_chip *chip)
{
/* If Operational settings defined elsewhere.. */
if (chip->pdata && chip->pdata->platform_default_settings)
memcpy(&chip->settings, chip->pdata->platform_default_settings,
sizeof(tsl2772_default_settings));
else
memcpy(&chip->settings, &tsl2772_default_settings,
sizeof(tsl2772_default_settings));

/* Load up the proper lux table. */
if (chip->pdata && chip->pdata->platform_lux_table[0].ch0 != 0)
memcpy(chip->tsl2772_device_lux,
chip->pdata->platform_lux_table,
sizeof(chip->pdata->platform_lux_table));
else
memcpy(chip->tsl2772_device_lux,
tsl2772_default_lux_table_group[chip->id],
TSL2772_DEFAULT_TABLE_BYTES);
}

/**
* tsl2772_als_calibrate() - Obtain single reading and calculate
* the als_gain_trim.
*
* @indio_dev: pointer to IIO device
*/
static int tsl2772_als_calibrate(struct iio_dev *indio_dev)
{
struct tsl2772_chip *chip = iio_priv(indio_dev);
int ret, lux_val;

ret = i2c_smbus_read_byte_data(chip->client,
TSL2772_CMD_REG | TSL2772_CNTRL);
if (ret < 0) {
dev_err(&chip->client->dev,
"%s: failed to read from the CNTRL register\n",
__func__);
return ret;
}

if ((ret & (TSL2772_CNTL_ADC_ENBL | TSL2772_CNTL_PWR_ON))
!= (TSL2772_CNTL_ADC_ENBL | TSL2772_CNTL_PWR_ON)) {
dev_err(&chip->client->dev,
"%s: Device is not powered on and/or ADC is not enabled\n",
__func__);
return -EINVAL;
} else if ((ret & TSL2772_STA_ADC_VALID) != TSL2772_STA_ADC_VALID) {
dev_err(&chip->client->dev,
"%s: The two ADC channels have not completed an integration cycle\n",
__func__);
return -ENODATA;
}

lux_val = tsl2772_get_lux(indio_dev);
if (lux_val < 0) {
dev_err(&chip->client->dev,
"%s: failed to get lux\n", __func__);
return lux_val;
}

ret = (chip->settings.als_cal_target * chip->settings.als_gain_trim) /
lux_val;
if (ret < 250 || ret > 4000)
return -ERANGE;

chip->settings.als_gain_trim = ret;

return ret;
}

static int tsl2772_chip_on(struct iio_dev *indio_dev)
{
struct tsl2772_chip *chip = iio_priv(indio_dev);
int ret, i, als_count, als_time_us;
u8 *dev_reg, reg_val;

/* Non calculated parameters */
chip->tsl2772_config[TSL2772_ALS_TIME] = chip->settings.als_time;
chip->tsl2772_config[TSL2772_PRX_TIME] = chip->settings.prox_time;
chip->tsl2772_config[TSL2772_WAIT_TIME] = chip->settings.wait_time;
chip->tsl2772_config[TSL2772_ALS_PRX_CONFIG] =
chip->settings.als_prox_config;

chip->tsl2772_config[TSL2772_ALS_MINTHRESHLO] =
(chip->settings.als_thresh_low) & 0xFF;
chip->tsl2772_config[TSL2772_ALS_MINTHRESHHI] =
(chip->settings.als_thresh_low >> 8) & 0xFF;
chip->tsl2772_config[TSL2772_ALS_MAXTHRESHLO] =
(chip->settings.als_thresh_high) & 0xFF;
chip->tsl2772_config[TSL2772_ALS_MAXTHRESHHI] =
(chip->settings.als_thresh_high >> 8) & 0xFF;
chip->tsl2772_config[TSL2772_PERSISTENCE] =
(chip->settings.prox_persistence & 0xFF) << 4 |
(chip->settings.als_persistence & 0xFF);

chip->tsl2772_config[TSL2772_PRX_COUNT] =
chip->settings.prox_pulse_count;
chip->tsl2772_config[TSL2772_PRX_MINTHRESHLO] =
(chip->settings.prox_thres_low) & 0xFF;
chip->tsl2772_config[TSL2772_PRX_MINTHRESHHI] =
(chip->settings.prox_thres_low >> 8) & 0xFF;
chip->tsl2772_config[TSL2772_PRX_MAXTHRESHLO] =
(chip->settings.prox_thres_high) & 0xFF;
chip->tsl2772_config[TSL2772_PRX_MAXTHRESHHI] =
(chip->settings.prox_thres_high >> 8) & 0xFF;

/* and make sure we're not already on */
if (chip->tsl2772_chip_status == TSL2772_CHIP_WORKING) {
/* if forcing a register update - turn off, then on */
dev_info(&chip->client->dev, "device is already enabled\n");
return -EINVAL;
}

/* Set the gain based on tsl2772_settings struct */
chip->tsl2772_config[TSL2772_GAIN] =
(chip->settings.als_gain & 0xFF) |
((chip->settings.prox_gain & 0xFF) << 2) |
(chip->settings.prox_diode << 4) |
(chip->settings.prox_power << 6);

/* set chip time scaling and saturation */
als_count = 256 - chip->settings.als_time;
als_time_us = als_count * tsl2772_int_time[chip->id].increment_us;
chip->als_saturation = als_count * 768; /* 75% of full scale */
chip->als_gain_time_scale = als_time_us *
tsl2772_als_gain[chip->settings.als_gain];

/*
* TSL2772 Specific power-on / adc enable sequence
* Power on the device 1st.
*/
ret = tsl2772_write_control_reg(chip, TSL2772_CNTL_PWR_ON);
if (ret < 0)
return ret;

/*
* Use the following shadow copy for our delay before enabling ADC.
* Write all the registers.
*/
for (i = 0, dev_reg = chip->tsl2772_config;
i < TSL2772_MAX_CONFIG_REG; i++) {
int reg = TSL2772_CMD_REG + i;

ret = i2c_smbus_write_byte_data(chip->client, reg,
*dev_reg++);
if (ret < 0) {
dev_err(&chip->client->dev,
"%s: failed to write to register %x: %d\n",
__func__, reg, ret);
return ret;
}
}

/* Power-on settling time */
usleep_range(3000, 3500);

reg_val = TSL2772_CNTL_PWR_ON | TSL2772_CNTL_ADC_ENBL |
TSL2772_CNTL_PROX_DET_ENBL;
if (chip->settings.als_interrupt_en)
reg_val |= TSL2772_CNTL_ALS_INT_ENBL;
if (chip->settings.prox_interrupt_en)
reg_val |= TSL2772_CNTL_PROX_INT_ENBL;

ret = tsl2772_write_control_reg(chip, reg_val);
if (ret < 0)
return ret;

ret = i2c_smbus_write_byte(chip->client,
TSL2772_CMD_REG | TSL2772_CMD_SPL_FN |
TSL2772_CMD_PROXALS_INT_CLR);
if (ret < 0) {
dev_err(&chip->client->dev,
"%s: failed to clear interrupt status: %d\n",
__func__, ret);
return ret;
}

chip->tsl2772_chip_status = TSL2772_CHIP_WORKING;

return ret;
}

static int tsl2772_chip_off(struct iio_dev *indio_dev)
{
struct tsl2772_chip *chip = iio_priv(indio_dev);

/* turn device off */
chip->tsl2772_chip_status = TSL2772_CHIP_SUSPENDED;
return tsl2772_write_control_reg(chip, 0x00);
}

/**
* tsl2772_invoke_change - power cycle the device to implement the user
* parameters
* @indio_dev: pointer to IIO device
*
* Obtain and lock both ALS and PROX resources, determine and save device state
* (On/Off), cycle device to implement updated parameter, put device back into
* proper state, and unlock resource.
*/
static int tsl2772_invoke_change(struct iio_dev *indio_dev)
{
struct tsl2772_chip *chip = iio_priv(indio_dev);
int device_status = chip->tsl2772_chip_status;
int ret;

mutex_lock(&chip->als_mutex);
mutex_lock(&chip->prox_mutex);

if (device_status == TSL2772_CHIP_WORKING) {
ret = tsl2772_chip_off(indio_dev);
if (ret < 0)
goto unlock;
}

ret = tsl2772_chip_on(indio_dev);

unlock:
mutex_unlock(&chip->prox_mutex);
mutex_unlock(&chip->als_mutex);

return ret;
}

static int tsl2772_prox_cal(struct iio_dev *indio_dev)
{
struct tsl2772_chip *chip = iio_priv(indio_dev);
int prox_history[MAX_SAMPLES_CAL + 1];
int i, ret, mean, max, sample_sum;

if (chip->settings.prox_max_samples_cal < 1 ||
chip->settings.prox_max_samples_cal > MAX_SAMPLES_CAL)
return -EINVAL;

for (i = 0; i < chip->settings.prox_max_samples_cal; i++) {
usleep_range(15000, 17500);
ret = tsl2772_get_prox(indio_dev);
if (ret < 0)
return ret;

prox_history[i] = chip->prox_data;
}

sample_sum = 0;
max = INT_MIN;
for (i = 0; i < chip->settings.prox_max_samples_cal; i++) {
sample_sum += prox_history[i];
max = max(max, prox_history[i]);
}
mean = sample_sum / chip->settings.prox_max_samples_cal;

chip->settings.prox_thres_high = (max << 1) - mean;

return tsl2772_invoke_change(indio_dev);
}

static IIO_CONST_ATTR(in_intensity0_calibscale_available, "1 8 16 120");

static IIO_CONST_ATTR(in_proximity0_calibscale_available, "1 2 4 8");

static ssize_t
in_intensity0_integration_time_available_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct tsl2772_chip *chip = iio_priv(dev_to_iio_dev(dev));

return snprintf(buf, PAGE_SIZE, "%s\n",
tsl2772_int_time[chip->id].display_range);
}

static ssize_t in_illuminance0_target_input_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct tsl2772_chip *chip = iio_priv(dev_to_iio_dev(dev));

return snprintf(buf, PAGE_SIZE, "%d\n", chip->settings.als_cal_target);
}

static ssize_t in_illuminance0_target_input_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct tsl2772_chip *chip = iio_priv(indio_dev);
u16 value;
int ret;

if (kstrtou16(buf, 0, &value))
return -EINVAL;

chip->settings.als_cal_target = value;
ret = tsl2772_invoke_change(indio_dev);
if (ret < 0)
return ret;

return len;
}

static ssize_t in_illuminance0_calibrate_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
bool value;
int ret;

if (kstrtobool(buf, &value) || !value)
return -EINVAL;

ret = tsl2772_als_calibrate(indio_dev);
if (ret < 0)
return ret;

ret = tsl2772_invoke_change(indio_dev);
if (ret < 0)
return ret;

return len;
}

static ssize_t in_illuminance0_lux_table_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct tsl2772_chip *chip = iio_priv(dev_to_iio_dev(dev));
int i = 0;
int offset = 0;

while (i < TSL2772_MAX_LUX_TABLE_SIZE) {
offset += snprintf(buf + offset, PAGE_SIZE, "%u,%u,",
chip->tsl2772_device_lux[i].ch0,
chip->tsl2772_device_lux[i].ch1);
if (chip->tsl2772_device_lux[i].ch0 == 0) {
/*
* We just printed the first "0" entry.
* Now get rid of the extra "," and break.
*/
offset--;
break;
}
i++;
}

offset += snprintf(buf + offset, PAGE_SIZE, "\n");
return offset;
}

static ssize_t in_illuminance0_lux_table_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct tsl2772_chip *chip = iio_priv(indio_dev);
int value[ARRAY_SIZE(chip->tsl2772_device_lux) * 2 + 1];
int n, ret;

get_options(buf, ARRAY_SIZE(value), value);

/*
* We now have an array of ints starting at value[1], and
* enumerated by value[0].
* We expect each group of two ints to be one table entry,
* and the last table entry is all 0.
*/
n = value[0];
if ((n % 2) || n < 4 ||
n > ((ARRAY_SIZE(chip->tsl2772_device_lux) - 1) * 2))
return -EINVAL;

if ((value[(n - 1)] | value[n]) != 0)
return -EINVAL;

if (chip->tsl2772_chip_status == TSL2772_CHIP_WORKING) {
ret = tsl2772_chip_off(indio_dev);
if (ret < 0)
return ret;
}

/* Zero out the table */
memset(chip->tsl2772_device_lux, 0, sizeof(chip->tsl2772_device_lux));
memcpy(chip->tsl2772_device_lux, &value[1], (value[0] * 4));

ret = tsl2772_invoke_change(indio_dev);
if (ret < 0)
return ret;

return len;
}

static ssize_t in_proximity0_calibrate_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
bool value;
int ret;

if (kstrtobool(buf, &value) || !value)
return -EINVAL;

ret = tsl2772_prox_cal(indio_dev);
if (ret < 0)
return ret;

ret = tsl2772_invoke_change(indio_dev);
if (ret < 0)
return ret;

return len;
}

static int tsl2772_read_interrupt_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir)
{
struct tsl2772_chip *chip = iio_priv(indio_dev);

if (chan->type == IIO_INTENSITY)
return chip->settings.als_interrupt_en;
else
return chip->settings.prox_interrupt_en;
}

static int tsl2772_write_interrupt_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
int val)
{
struct tsl2772_chip *chip = iio_priv(indio_dev);

if (chan->type == IIO_INTENSITY)
chip->settings.als_interrupt_en = val ? true : false;
else
chip->settings.prox_interrupt_en = val ? true : false;

return tsl2772_invoke_change(indio_dev);
}

static int tsl2772_write_event_value(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info,
int val, int val2)
{
struct tsl2772_chip *chip = iio_priv(indio_dev);
int ret = -EINVAL, count, persistence;
u8 time;

switch (info) {
case IIO_EV_INFO_VALUE:
if (chan->type == IIO_INTENSITY) {
switch (dir) {
case IIO_EV_DIR_RISING:
chip->settings.als_thresh_high = val;
ret = 0;
break;
case IIO_EV_DIR_FALLING:
chip->settings.als_thresh_low = val;
ret = 0;
break;
default:
break;
}
} else {
switch (dir) {
case IIO_EV_DIR_RISING:
chip->settings.prox_thres_high = val;
ret = 0;
break;
case IIO_EV_DIR_FALLING:
chip->settings.prox_thres_low = val;
ret = 0;
break;
default:
break;
}
}
break;
case IIO_EV_INFO_PERIOD:
if (chan->type == IIO_INTENSITY)
time = chip->settings.als_time;
else
time = chip->settings.prox_time;

count = 256 - time;
persistence = ((val * 1000000) + val2) /
(count * tsl2772_int_time[chip->id].increment_us);

if (chan->type == IIO_INTENSITY) {
/* ALS filter values are 1, 2, 3, 5, 10, 15, ..., 60 */
if (persistence > 3)
persistence = (persistence / 5) + 3;

chip->settings.als_persistence = persistence;
} else {
chip->settings.prox_persistence = persistence;
}

ret = 0;
break;
default:
break;
}

if (ret < 0)
return ret;

return tsl2772_invoke_change(indio_dev);
}

static int tsl2772_read_event_value(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info,
int *val, int *val2)
{
struct tsl2772_chip *chip = iio_priv(indio_dev);
int ret = -EINVAL, filter_delay, persistence;
u8 time;

switch (info) {
case IIO_EV_INFO_VALUE:
if (chan->type == IIO_INTENSITY) {
switch (dir) {
case IIO_EV_DIR_RISING:
*val = chip->settings.als_thresh_high;
ret = IIO_VAL_INT;
break;
case IIO_EV_DIR_FALLING:
*val = chip->settings.als_thresh_low;
ret = IIO_VAL_INT;
break;
default:
break;
}
} else {
switch (dir) {
case IIO_EV_DIR_RISING:
*val = chip->settings.prox_thres_high;
ret = IIO_VAL_INT;
break;
case IIO_EV_DIR_FALLING:
*val = chip->settings.prox_thres_low;
ret = IIO_VAL_INT;
break;
default:
break;
}
}
break;
case IIO_EV_INFO_PERIOD:
if (chan->type == IIO_INTENSITY) {
time = chip->settings.als_time;
persistence = chip->settings.als_persistence;

/* ALS filter values are 1, 2, 3, 5, 10, 15, ..., 60 */
if (persistence > 3)
persistence = (persistence - 3) * 5;
} else {
time = chip->settings.prox_time;
persistence = chip->settings.prox_persistence;
}

filter_delay = persistence * (256 - time) *
tsl2772_int_time[chip->id].increment_us;

*val = filter_delay / 1000000;
*val2 = filter_delay % 1000000;
ret = IIO_VAL_INT_PLUS_MICRO;
break;
default:
break;
}

return ret;
}

static int tsl2772_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long mask)
{
struct tsl2772_chip *chip = iio_priv(indio_dev);
int ret = -EINVAL;

switch (mask) {
case IIO_CHAN_INFO_PROCESSED:
switch (chan->type) {
case IIO_LIGHT:
tsl2772_get_lux(indio_dev);
*val = chip->als_cur_info.lux;
ret = IIO_VAL_INT;
break;
default:
return -EINVAL;
}
break;
case IIO_CHAN_INFO_RAW:
switch (chan->type) {
case IIO_INTENSITY:
tsl2772_get_lux(indio_dev);
if (chan->channel == 0)
*val = chip->als_cur_info.als_ch0;
else
*val = chip->als_cur_info.als_ch1;
ret = IIO_VAL_INT;
break;
case IIO_PROXIMITY:
tsl2772_get_prox(indio_dev);
*val = chip->prox_data;
ret = IIO_VAL_INT;
break;
default:
return -EINVAL;
}
break;
case IIO_CHAN_INFO_CALIBSCALE:
if (chan->type == IIO_LIGHT)
*val = tsl2772_als_gain[chip->settings.als_gain];
else
*val = tsl2772_prox_gain[chip->settings.prox_gain];
ret = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_CALIBBIAS:
*val = chip->settings.als_gain_trim;
ret = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_INT_TIME:
*val = 0;
*val2 = (256 - chip->settings.als_time) *
tsl2772_int_time[chip->id].increment_us;
ret = IIO_VAL_INT_PLUS_MICRO;
break;
default:
ret = -EINVAL;
}

return ret;
}

static int tsl2772_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
int val2,
long mask)
{
struct tsl2772_chip *chip = iio_priv(indio_dev);

switch (mask) {
case IIO_CHAN_INFO_CALIBSCALE:
if (chan->type == IIO_INTENSITY) {
switch (val) {
case 1:
chip->settings.als_gain = 0;
break;
case 8:
chip->settings.als_gain = 1;
break;
case 16:
chip->settings.als_gain = 2;
break;
case 120:
chip->settings.als_gain = 3;
break;
default:
return -EINVAL;
}
} else {
switch (val) {
case 1:
chip->settings.prox_gain = 0;
break;
case 2:
chip->settings.prox_gain = 1;
break;
case 4:
chip->settings.prox_gain = 2;
break;
case 8:
chip->settings.prox_gain = 3;
break;
default:
return -EINVAL;
}
}
break;
case IIO_CHAN_INFO_CALIBBIAS:
chip->settings.als_gain_trim = val;
break;
case IIO_CHAN_INFO_INT_TIME:
chip->settings.als_time = 256 -
(val2 / tsl2772_int_time[chip->id].increment_us);
break;
default:
return -EINVAL;
}

return tsl2772_invoke_change(indio_dev);
}

static DEVICE_ATTR_RO(in_intensity0_integration_time_available);

static DEVICE_ATTR_RW(in_illuminance0_target_input);

static DEVICE_ATTR_WO(in_illuminance0_calibrate);

static DEVICE_ATTR_WO(in_proximity0_calibrate);

static DEVICE_ATTR_RW(in_illuminance0_lux_table);

/* Use the default register values to identify the Taos device */
static int tsl2772_device_id_verif(int id, int target)
{
switch (target) {
case tsl2571:
case tsl2671:
case tsl2771:
return (id & 0xf0) == TRITON_ID;
case tmd2671:
case tmd2771:
return (id & 0xf0) == HALIBUT_ID;
case tsl2572:
case tsl2672:
case tmd2672:
case tsl2772:
case tmd2772:
return (id & 0xf0) == SWORDFISH_ID;
}

return -EINVAL;
}

static irqreturn_t tsl2772_event_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct tsl2772_chip *chip = iio_priv(indio_dev);
s64 timestamp = iio_get_time_ns(indio_dev);
int ret;

ret = tsl2772_read_status(chip);
if (ret < 0)
return IRQ_HANDLED;

/* What type of interrupt do we need to process */
if (ret & TSL2772_STA_PRX_INTR) {
iio_push_event(indio_dev,
IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY,
0,
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_EITHER),
timestamp);
}

if (ret & TSL2772_STA_ALS_INTR) {
iio_push_event(indio_dev,
IIO_UNMOD_EVENT_CODE(IIO_LIGHT,
0,
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_EITHER),
timestamp);
}

ret = i2c_smbus_write_byte(chip->client,
TSL2772_CMD_REG | TSL2772_CMD_SPL_FN |
TSL2772_CMD_PROXALS_INT_CLR);
if (ret < 0)
dev_err(&chip->client->dev,
"%s: failed to clear interrupt status: %d\n",
__func__, ret);

return IRQ_HANDLED;
}

static struct attribute *tsl2772_ALS_device_attrs[] = {
&iio_const_attr_in_intensity0_calibscale_available.dev_attr.attr,
&dev_attr_in_intensity0_integration_time_available.attr,
&dev_attr_in_illuminance0_target_input.attr,
&dev_attr_in_illuminance0_calibrate.attr,
&dev_attr_in_illuminance0_lux_table.attr,
NULL
};

static struct attribute *tsl2772_PRX_device_attrs[] = {
&dev_attr_in_proximity0_calibrate.attr,
NULL
};

static struct attribute *tsl2772_ALSPRX_device_attrs[] = {
&iio_const_attr_in_intensity0_calibscale_available.dev_attr.attr,
&dev_attr_in_intensity0_integration_time_available.attr,
&dev_attr_in_illuminance0_target_input.attr,
&dev_attr_in_illuminance0_calibrate.attr,
&dev_attr_in_illuminance0_lux_table.attr,
NULL
};

static struct attribute *tsl2772_PRX2_device_attrs[] = {
&dev_attr_in_proximity0_calibrate.attr,
&iio_const_attr_in_proximity0_calibscale_available.dev_attr.attr,
NULL
};

static struct attribute *tsl2772_ALSPRX2_device_attrs[] = {
&iio_const_attr_in_intensity0_calibscale_available.dev_attr.attr,
&dev_attr_in_intensity0_integration_time_available.attr,
&dev_attr_in_illuminance0_target_input.attr,
&dev_attr_in_illuminance0_calibrate.attr,
&dev_attr_in_illuminance0_lux_table.attr,
&dev_attr_in_proximity0_calibrate.attr,
&iio_const_attr_in_proximity0_calibscale_available.dev_attr.attr,
NULL
};

static const struct attribute_group tsl2772_device_attr_group_tbl[] = {
[ALS] = {
.attrs = tsl2772_ALS_device_attrs,
},
[PRX] = {
.attrs = tsl2772_PRX_device_attrs,
},
[ALSPRX] = {
.attrs = tsl2772_ALSPRX_device_attrs,
},
[PRX2] = {
.attrs = tsl2772_PRX2_device_attrs,
},
[ALSPRX2] = {
.attrs = tsl2772_ALSPRX2_device_attrs,
},
};

static const struct iio_info tsl2772_device_info[] = {
[ALS] = {
.attrs = &tsl2772_device_attr_group_tbl[ALS],
.read_raw = &tsl2772_read_raw,
.write_raw = &tsl2772_write_raw,
.read_event_value = &tsl2772_read_event_value,
.write_event_value = &tsl2772_write_event_value,
.read_event_config = &tsl2772_read_interrupt_config,
.write_event_config = &tsl2772_write_interrupt_config,
},
[PRX] = {
.attrs = &tsl2772_device_attr_group_tbl[PRX],
.read_raw = &tsl2772_read_raw,
.write_raw = &tsl2772_write_raw,
.read_event_value = &tsl2772_read_event_value,
.write_event_value = &tsl2772_write_event_value,
.read_event_config = &tsl2772_read_interrupt_config,
.write_event_config = &tsl2772_write_interrupt_config,
},
[ALSPRX] = {
.attrs = &tsl2772_device_attr_group_tbl[ALSPRX],
.read_raw = &tsl2772_read_raw,
.write_raw = &tsl2772_write_raw,
.read_event_value = &tsl2772_read_event_value,
.write_event_value = &tsl2772_write_event_value,
.read_event_config = &tsl2772_read_interrupt_config,
.write_event_config = &tsl2772_write_interrupt_config,
},
[PRX2] = {
.attrs = &tsl2772_device_attr_group_tbl[PRX2],
.read_raw = &tsl2772_read_raw,
.write_raw = &tsl2772_write_raw,
.read_event_value = &tsl2772_read_event_value,
.write_event_value = &tsl2772_write_event_value,
.read_event_config = &tsl2772_read_interrupt_config,
.write_event_config = &tsl2772_write_interrupt_config,
},
[ALSPRX2] = {
.attrs = &tsl2772_device_attr_group_tbl[ALSPRX2],
.read_raw = &tsl2772_read_raw,
.write_raw = &tsl2772_write_raw,
.read_event_value = &tsl2772_read_event_value,
.write_event_value = &tsl2772_write_event_value,
.read_event_config = &tsl2772_read_interrupt_config,
.write_event_config = &tsl2772_write_interrupt_config,
},
};

static const struct iio_event_spec tsl2772_events[] = {
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_RISING,
.mask_separate = BIT(IIO_EV_INFO_VALUE),
}, {
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_FALLING,
.mask_separate = BIT(IIO_EV_INFO_VALUE),
}, {
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_EITHER,
.mask_separate = BIT(IIO_EV_INFO_PERIOD) |
BIT(IIO_EV_INFO_ENABLE),
},
};

static const struct tsl2772_chip_info tsl2772_chip_info_tbl[] = {
[ALS] = {
.channel_with_events = {
{
.type = IIO_LIGHT,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
}, {
.type = IIO_INTENSITY,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_CALIBSCALE) |
BIT(IIO_CHAN_INFO_CALIBBIAS),
.event_spec = tsl2772_events,
.num_event_specs = ARRAY_SIZE(tsl2772_events),
}, {
.type = IIO_INTENSITY,
.indexed = 1,
.channel = 1,
},
},
.channel_without_events = {
{
.type = IIO_LIGHT,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
}, {
.type = IIO_INTENSITY,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_CALIBSCALE) |
BIT(IIO_CHAN_INFO_CALIBBIAS),
}, {
.type = IIO_INTENSITY,
.indexed = 1,
.channel = 1,
},
},
.chan_table_elements = 3,
.info = &tsl2772_device_info[ALS],
},
[PRX] = {
.channel_with_events = {
{
.type = IIO_PROXIMITY,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.event_spec = tsl2772_events,
.num_event_specs = ARRAY_SIZE(tsl2772_events),
},
},
.channel_without_events = {
{
.type = IIO_PROXIMITY,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
},
},
.chan_table_elements = 1,
.info = &tsl2772_device_info[PRX],
},
[ALSPRX] = {
.channel_with_events = {
{
.type = IIO_LIGHT,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
}, {
.type = IIO_INTENSITY,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_CALIBSCALE) |
BIT(IIO_CHAN_INFO_CALIBBIAS),
.event_spec = tsl2772_events,
.num_event_specs = ARRAY_SIZE(tsl2772_events),
}, {
.type = IIO_INTENSITY,
.indexed = 1,
.channel = 1,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
}, {
.type = IIO_PROXIMITY,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.event_spec = tsl2772_events,
.num_event_specs = ARRAY_SIZE(tsl2772_events),
},
},
.channel_without_events = {
{
.type = IIO_LIGHT,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
}, {
.type = IIO_INTENSITY,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_CALIBSCALE) |
BIT(IIO_CHAN_INFO_CALIBBIAS),
}, {
.type = IIO_INTENSITY,
.indexed = 1,
.channel = 1,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
}, {
.type = IIO_PROXIMITY,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
},
},
.chan_table_elements = 4,
.info = &tsl2772_device_info[ALSPRX],
},
[PRX2] = {
.channel_with_events = {
{
.type = IIO_PROXIMITY,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_CALIBSCALE),
.event_spec = tsl2772_events,
.num_event_specs = ARRAY_SIZE(tsl2772_events),
},
},
.channel_without_events = {
{
.type = IIO_PROXIMITY,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_CALIBSCALE),
},
},
.chan_table_elements = 1,
.info = &tsl2772_device_info[PRX2],
},
[ALSPRX2] = {
.channel_with_events = {
{
.type = IIO_LIGHT,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
}, {
.type = IIO_INTENSITY,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_CALIBSCALE) |
BIT(IIO_CHAN_INFO_CALIBBIAS),
.event_spec = tsl2772_events,
.num_event_specs = ARRAY_SIZE(tsl2772_events),
}, {
.type = IIO_INTENSITY,
.indexed = 1,
.channel = 1,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
}, {
.type = IIO_PROXIMITY,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_CALIBSCALE),
.event_spec = tsl2772_events,
.num_event_specs = ARRAY_SIZE(tsl2772_events),
},
},
.channel_without_events = {
{
.type = IIO_LIGHT,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
}, {
.type = IIO_INTENSITY,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_CALIBSCALE) |
BIT(IIO_CHAN_INFO_CALIBBIAS),
}, {
.type = IIO_INTENSITY,
.indexed = 1,
.channel = 1,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
}, {
.type = IIO_PROXIMITY,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_CALIBSCALE),
},
},
.chan_table_elements = 4,
.info = &tsl2772_device_info[ALSPRX2],
},
};

static int tsl2772_probe(struct i2c_client *clientp,
const struct i2c_device_id *id)
{
struct iio_dev *indio_dev;
struct tsl2772_chip *chip;
int ret;

indio_dev = devm_iio_device_alloc(&clientp->dev, sizeof(*chip));
if (!indio_dev)
return -ENOMEM;

chip = iio_priv(indio_dev);
chip->client = clientp;
i2c_set_clientdata(clientp, indio_dev);

ret = i2c_smbus_read_byte_data(chip->client,
TSL2772_CMD_REG | TSL2772_CHIPID);
if (ret < 0)
return ret;

if (tsl2772_device_id_verif(ret, id->driver_data) <= 0) {
dev_info(&chip->client->dev,
"%s: i2c device found does not match expected id\n",
__func__);
return -EINVAL;
}

ret = i2c_smbus_write_byte(clientp, TSL2772_CMD_REG | TSL2772_CNTRL);
if (ret < 0) {
dev_err(&clientp->dev,
"%s: Failed to write to CMD register: %d\n",
__func__, ret);
return ret;
}

mutex_init(&chip->als_mutex);
mutex_init(&chip->prox_mutex);

chip->tsl2772_chip_status = TSL2772_CHIP_UNKNOWN;
chip->pdata = dev_get_platdata(&clientp->dev);
chip->id = id->driver_data;
chip->chip_info =
&tsl2772_chip_info_tbl[device_channel_config[id->driver_data]];

indio_dev->info = chip->chip_info->info;
indio_dev->dev.parent = &clientp->dev;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->name = chip->client->name;
indio_dev->num_channels = chip->chip_info->chan_table_elements;

if (clientp->irq) {
indio_dev->channels = chip->chip_info->channel_with_events;

ret = devm_request_threaded_irq(&clientp->dev, clientp->irq,
NULL,
&tsl2772_event_handler,
IRQF_TRIGGER_FALLING |
IRQF_ONESHOT,
"TSL2772_event",
indio_dev);
if (ret) {
dev_err(&clientp->dev,
"%s: irq request failed\n", __func__);
return ret;
}
} else {
indio_dev->channels = chip->chip_info->channel_without_events;
}

tsl2772_defaults(chip);
tsl2772_chip_on(indio_dev);

ret = iio_device_register(indio_dev);
if (ret) {
dev_err(&clientp->dev,
"%s: iio registration failed\n", __func__);
return ret;
}

return 0;
}

static int tsl2772_suspend(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);

return tsl2772_chip_off(indio_dev);
}

static int tsl2772_resume(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);

return tsl2772_chip_on(indio_dev);
}

static int tsl2772_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);

tsl2772_chip_off(indio_dev);

iio_device_unregister(indio_dev);

return 0;
}

static const struct i2c_device_id tsl2772_idtable[] = {
{ "tsl2571", tsl2571 },
{ "tsl2671", tsl2671 },
{ "tmd2671", tmd2671 },
{ "tsl2771", tsl2771 },
{ "tmd2771", tmd2771 },
{ "tsl2572", tsl2572 },
{ "tsl2672", tsl2672 },
{ "tmd2672", tmd2672 },
{ "tsl2772", tsl2772 },
{ "tmd2772", tmd2772 },
{}
};

MODULE_DEVICE_TABLE(i2c, tsl2772_idtable);

static const struct of_device_id tsl2772_of_match[] = {
{ .compatible = "amstaos,tsl2571" },
{ .compatible = "amstaos,tsl2671" },
{ .compatible = "amstaos,tmd2671" },
{ .compatible = "amstaos,tsl2771" },
{ .compatible = "amstaos,tmd2771" },
{ .compatible = "amstaos,tsl2572" },
{ .compatible = "amstaos,tsl2672" },
{ .compatible = "amstaos,tmd2672" },
{ .compatible = "amstaos,tsl2772" },
{ .compatible = "amstaos,tmd2772" },
{}
};
MODULE_DEVICE_TABLE(of, tsl2772_of_match);

static const struct dev_pm_ops tsl2772_pm_ops = {
.suspend = tsl2772_suspend,
.resume = tsl2772_resume,
};

static struct i2c_driver tsl2772_driver = {
.driver = {
.name = "tsl2772",
.of_match_table = tsl2772_of_match,
.pm = &tsl2772_pm_ops,
},
.id_table = tsl2772_idtable,
.probe = tsl2772_probe,
.remove = tsl2772_remove,
};

module_i2c_driver(tsl2772_driver);

MODULE_AUTHOR("J. August Brenner <Jon.Brenner@ams.com>");
MODULE_AUTHOR("Brian Masney <masneyb@onstation.org>");
MODULE_DESCRIPTION("TAOS tsl2772 ambient and proximity light sensor driver");
MODULE_LICENSE("GPL");

-----------------------------------------------------------------------

tsl2772.h:

/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Device driver for monitoring ambient light intensity (lux)
* and proximity (prox) within the TAOS TSL2772 family of devices.
*
* Copyright (c) 2012, TAOS Corporation.
*/

#ifndef __TSL2772_H
#define __TSL2772_H

struct tsl2772_lux {
unsigned int ch0;
unsigned int ch1;
};

/* Max number of segments allowable in LUX table */
#define TSL2772_MAX_LUX_TABLE_SIZE 6
/* The default LUX tables all have 3 elements. */
#define TSL2772_DEF_LUX_TABLE_SZ 3
#define TSL2772_DEFAULT_TABLE_BYTES (sizeof(struct tsl2772_lux) * \
TSL2772_DEF_LUX_TABLE_SZ)

/* Proximity diode to use */
#define TSL2772_DIODE0 0x01
#define TSL2772_DIODE1 0x02
#define TSL2772_DIODE_BOTH 0x03

/* LED Power */
#define TSL2772_100_mA 0x00
#define TSL2772_50_mA 0x01
#define TSL2772_25_mA 0x02
#define TSL2772_13_mA 0x03

/**
* struct tsl2772_settings - Settings for the tsl2772 driver
* @als_time: Integration time of the ALS channel ADCs in 2.73 ms
* increments. Total integration time is
* (256 - als_time) * 2.73.
* @als_gain: Index into the tsl2772_als_gain array.
* @als_gain_trim: Default gain trim to account for aperture effects.
* @wait_time: Time between proximity and ALS cycles in 2.73
* periods.
* @prox_time: Integration time of the proximity ADC in 2.73 ms
* increments. Total integration time is
* (256 - prx_time) * 2.73.
* @prox_gain: Index into the tsl2772_prx_gain array.
* @als_prox_config: The value of the ALS / Proximity configuration
* register.
* @als_cal_target: Known external ALS reading for calibration.
* @als_persistence: H/W Filters, Number of 'out of limits' ALS readings.
* @als_interrupt_en: Enable/Disable ALS interrupts
* @als_thresh_low: CH0 'low' count to trigger interrupt.
* @als_thresh_high: CH0 'high' count to trigger interrupt.
* @prox_persistence: H/W Filters, Number of 'out of limits' proximity
* readings.
* @prox_interrupt_en: Enable/Disable proximity interrupts.
* @prox_thres_low: Low threshold proximity detection.
* @prox_thres_high: High threshold proximity detection.
* @prox_pulse_count: Number if proximity emitter pulses.
* @prox_max_samples_cal: The number of samples that are taken when performing
* a proximity calibration.
* @prox_diode Which diode(s) to use for driving the external
* LED(s) for proximity sensing.
* @prox_power The amount of power to use for the external LED(s).
*/
struct tsl2772_settings {
int als_time;
int als_gain;
int als_gain_trim;
int wait_time;
int prox_time;
int prox_gain;
int als_prox_config;
int als_cal_target;
u8 als_persistence;
bool als_interrupt_en;
int als_thresh_low;
int als_thresh_high;
u8 prox_persistence;
bool prox_interrupt_en;
int prox_thres_low;
int prox_thres_high;
int prox_pulse_count;
int prox_max_samples_cal;
int prox_diode;
int prox_power;
};

/**
* struct tsl2772_platform_data - Platform callback, glass and defaults
* @platform_lux_table: Device specific glass coefficents
* @platform_default_settings: Device specific power on defaults
*
*/
struct tsl2772_platform_data {
struct tsl2772_lux platform_lux_table[TSL2772_MAX_LUX_TABLE_SIZE];
struct tsl2772_settings *platform_default_settings;
};

#endif /* __TSL2772_H */