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linux-zen-server/drivers/iio/light/tsl2591.c

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Initial commit
2023-08-30 17:53:23 +02:00
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2021 Joe Sandom <joe.g.sandom@gmail.com>
*
* Datasheet: https://ams.com/tsl25911#tab/documents
*
* Device driver for the TAOS TSL2591. This is a very-high sensitivity
* light-to-digital converter that transforms light intensity into a digital
* signal.
*/
#include <linux/bitfield.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/pm_runtime.h>
#include <linux/sysfs.h>
#include <asm/unaligned.h>
#include <linux/iio/events.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
/* ADC integration time, field value to time in ms */
#define TSL2591_FVAL_TO_MSEC(x) (((x) + 1) * 100)
/* ADC integration time, field value to time in seconds */
#define TSL2591_FVAL_TO_SEC(x) ((x) + 1)
/* ADC integration time, time in seconds to field value */
#define TSL2591_SEC_TO_FVAL(x) ((x) - 1)
/* TSL2591 register set */
#define TSL2591_ENABLE 0x00
#define TSL2591_CONTROL 0x01
#define TSL2591_AILTL 0x04
#define TSL2591_AILTH 0x05
#define TSL2591_AIHTL 0x06
#define TSL2591_AIHTH 0x07
#define TSL2591_NP_AILTL 0x08
#define TSL2591_NP_AILTH 0x09
#define TSL2591_NP_AIHTL 0x0A
#define TSL2591_NP_AIHTH 0x0B
#define TSL2591_PERSIST 0x0C
#define TSL2591_PACKAGE_ID 0x11
#define TSL2591_DEVICE_ID 0x12
#define TSL2591_STATUS 0x13
#define TSL2591_C0_DATAL 0x14
#define TSL2591_C0_DATAH 0x15
#define TSL2591_C1_DATAL 0x16
#define TSL2591_C1_DATAH 0x17
/* TSL2591 command register definitions */
#define TSL2591_CMD_NOP 0xA0
#define TSL2591_CMD_SF_INTSET 0xE4
#define TSL2591_CMD_SF_CALS_I 0xE5
#define TSL2591_CMD_SF_CALS_NPI 0xE7
#define TSL2591_CMD_SF_CNP_ALSI 0xEA
/* TSL2591 enable register definitions */
#define TSL2591_PWR_ON 0x01
#define TSL2591_PWR_OFF 0x00
#define TSL2591_ENABLE_ALS 0x02
#define TSL2591_ENABLE_ALS_INT 0x10
#define TSL2591_ENABLE_SLEEP_INT 0x40
#define TSL2591_ENABLE_NP_INT 0x80
/* TSL2591 control register definitions */
#define TSL2591_CTRL_ALS_INTEGRATION_100MS 0x00
#define TSL2591_CTRL_ALS_INTEGRATION_200MS 0x01
#define TSL2591_CTRL_ALS_INTEGRATION_300MS 0x02
#define TSL2591_CTRL_ALS_INTEGRATION_400MS 0x03
#define TSL2591_CTRL_ALS_INTEGRATION_500MS 0x04
#define TSL2591_CTRL_ALS_INTEGRATION_600MS 0x05
#define TSL2591_CTRL_ALS_LOW_GAIN 0x00
#define TSL2591_CTRL_ALS_MED_GAIN 0x10
#define TSL2591_CTRL_ALS_HIGH_GAIN 0x20
#define TSL2591_CTRL_ALS_MAX_GAIN 0x30
#define TSL2591_CTRL_SYS_RESET 0x80
/* TSL2591 persist register definitions */
#define TSL2591_PRST_ALS_INT_CYCLE_0 0x00
#define TSL2591_PRST_ALS_INT_CYCLE_ANY 0x01
#define TSL2591_PRST_ALS_INT_CYCLE_2 0x02
#define TSL2591_PRST_ALS_INT_CYCLE_3 0x03
#define TSL2591_PRST_ALS_INT_CYCLE_5 0x04
#define TSL2591_PRST_ALS_INT_CYCLE_10 0x05
#define TSL2591_PRST_ALS_INT_CYCLE_15 0x06
#define TSL2591_PRST_ALS_INT_CYCLE_20 0x07
#define TSL2591_PRST_ALS_INT_CYCLE_25 0x08
#define TSL2591_PRST_ALS_INT_CYCLE_30 0x09
#define TSL2591_PRST_ALS_INT_CYCLE_35 0x0A
#define TSL2591_PRST_ALS_INT_CYCLE_40 0x0B
#define TSL2591_PRST_ALS_INT_CYCLE_45 0x0C
#define TSL2591_PRST_ALS_INT_CYCLE_50 0x0D
#define TSL2591_PRST_ALS_INT_CYCLE_55 0x0E
#define TSL2591_PRST_ALS_INT_CYCLE_60 0x0F
#define TSL2591_PRST_ALS_INT_CYCLE_MAX (BIT(4) - 1)
/* TSL2591 PID register mask */
#define TSL2591_PACKAGE_ID_MASK GENMASK(5, 4)
/* TSL2591 ID register mask */
#define TSL2591_DEVICE_ID_MASK GENMASK(7, 0)
/* TSL2591 status register masks */
#define TSL2591_STS_ALS_VALID_MASK BIT(0)
#define TSL2591_STS_ALS_INT_MASK BIT(4)
#define TSL2591_STS_NPERS_INT_MASK BIT(5)
#define TSL2591_STS_VAL_HIGH_MASK BIT(0)
/* TSL2591 constant values */
#define TSL2591_PACKAGE_ID_VAL 0x00
#define TSL2591_DEVICE_ID_VAL 0x50
/* Power off suspend delay time MS */
#define TSL2591_POWER_OFF_DELAY_MS 2000
/* TSL2591 default values */
#define TSL2591_DEFAULT_ALS_INT_TIME TSL2591_CTRL_ALS_INTEGRATION_300MS
#define TSL2591_DEFAULT_ALS_GAIN TSL2591_CTRL_ALS_MED_GAIN
#define TSL2591_DEFAULT_ALS_PERSIST TSL2591_PRST_ALS_INT_CYCLE_ANY
#define TSL2591_DEFAULT_ALS_LOWER_THRESH 100
#define TSL2591_DEFAULT_ALS_UPPER_THRESH 1500
/* TSL2591 number of data registers */
#define TSL2591_NUM_DATA_REGISTERS 4
/* TSL2591 number of valid status reads on ADC complete */
#define TSL2591_ALS_STS_VALID_COUNT 10
/* TSL2591 delay period between polls when checking for ALS valid flag */
#define TSL2591_DELAY_PERIOD_US 10000
/* TSL2591 maximum values */
#define TSL2591_MAX_ALS_INT_TIME_MS 600
#define TSL2591_ALS_MAX_VALUE (BIT(16) - 1)
/*
* LUX calculations;
* AGAIN values from Adafruit's TSL2591 Arduino library
* https://github.com/adafruit/Adafruit_TSL2591_Library
*/
#define TSL2591_CTRL_ALS_LOW_GAIN_MULTIPLIER 1
#define TSL2591_CTRL_ALS_MED_GAIN_MULTIPLIER 25
#define TSL2591_CTRL_ALS_HIGH_GAIN_MULTIPLIER 428
#define TSL2591_CTRL_ALS_MAX_GAIN_MULTIPLIER 9876
#define TSL2591_LUX_COEFFICIENT 408
struct tsl2591_als_settings {
u16 als_lower_thresh;
u16 als_upper_thresh;
u8 als_int_time;
u8 als_persist;
u8 als_gain;
};
struct tsl2591_chip {
struct tsl2591_als_settings als_settings;
struct i2c_client *client;
/*
* Keep als_settings in sync with hardware state
* and ensure multiple readers are serialized.
*/
struct mutex als_mutex;
bool events_enabled;
};
/*
* Period table is ALS persist cycle x integration time setting
* Integration times: 100ms, 200ms, 300ms, 400ms, 500ms, 600ms
* ALS cycles: 1, 2, 3, 5, 10, 20, 25, 30, 35, 40, 45, 50, 55, 60
*/
static const char * const tsl2591_als_period_list[] = {
"0.1 0.2 0.3 0.5 1.0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0",
"0.2 0.4 0.6 1.0 2.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0",
"0.3 0.6 0.9 1.5 3.0 6.0 7.5 9.0 10.5 12.0 13.5 15.0 16.5 18.0",
"0.4 0.8 1.2 2.0 4.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0",
"0.5 1.0 1.5 2.5 5.0 10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0",
"0.6 1.2 1.8 3.0 6.0 12.0 15.0 18.0 21.0 24.0 27.0 30.0 33.0 36.0",
};
static const int tsl2591_int_time_available[] = {
1, 2, 3, 4, 5, 6,
};
static const int tsl2591_calibscale_available[] = {
1, 25, 428, 9876,
};
static int tsl2591_set_als_lower_threshold(struct tsl2591_chip *chip,
u16 als_lower_threshold);
static int tsl2591_set_als_upper_threshold(struct tsl2591_chip *chip,
u16 als_upper_threshold);
static int tsl2591_gain_to_multiplier(const u8 als_gain)
{
switch (als_gain) {
case TSL2591_CTRL_ALS_LOW_GAIN:
return TSL2591_CTRL_ALS_LOW_GAIN_MULTIPLIER;
case TSL2591_CTRL_ALS_MED_GAIN:
return TSL2591_CTRL_ALS_MED_GAIN_MULTIPLIER;
case TSL2591_CTRL_ALS_HIGH_GAIN:
return TSL2591_CTRL_ALS_HIGH_GAIN_MULTIPLIER;
case TSL2591_CTRL_ALS_MAX_GAIN:
return TSL2591_CTRL_ALS_MAX_GAIN_MULTIPLIER;
default:
return -EINVAL;
}
}
static int tsl2591_multiplier_to_gain(const u32 multiplier)
{
switch (multiplier) {
case TSL2591_CTRL_ALS_LOW_GAIN_MULTIPLIER:
return TSL2591_CTRL_ALS_LOW_GAIN;
case TSL2591_CTRL_ALS_MED_GAIN_MULTIPLIER:
return TSL2591_CTRL_ALS_MED_GAIN;
case TSL2591_CTRL_ALS_HIGH_GAIN_MULTIPLIER:
return TSL2591_CTRL_ALS_HIGH_GAIN;
case TSL2591_CTRL_ALS_MAX_GAIN_MULTIPLIER:
return TSL2591_CTRL_ALS_MAX_GAIN;
default:
return -EINVAL;
}
}
static int tsl2591_persist_cycle_to_lit(const u8 als_persist)
{
switch (als_persist) {
case TSL2591_PRST_ALS_INT_CYCLE_ANY:
return 1;
case TSL2591_PRST_ALS_INT_CYCLE_2:
return 2;
case TSL2591_PRST_ALS_INT_CYCLE_3:
return 3;
case TSL2591_PRST_ALS_INT_CYCLE_5:
return 5;
case TSL2591_PRST_ALS_INT_CYCLE_10:
return 10;
case TSL2591_PRST_ALS_INT_CYCLE_15:
return 15;
case TSL2591_PRST_ALS_INT_CYCLE_20:
return 20;
case TSL2591_PRST_ALS_INT_CYCLE_25:
return 25;
case TSL2591_PRST_ALS_INT_CYCLE_30:
return 30;
case TSL2591_PRST_ALS_INT_CYCLE_35:
return 35;
case TSL2591_PRST_ALS_INT_CYCLE_40:
return 40;
case TSL2591_PRST_ALS_INT_CYCLE_45:
return 45;
case TSL2591_PRST_ALS_INT_CYCLE_50:
return 50;
case TSL2591_PRST_ALS_INT_CYCLE_55:
return 55;
case TSL2591_PRST_ALS_INT_CYCLE_60:
return 60;
default:
return -EINVAL;
}
}
static int tsl2591_persist_lit_to_cycle(const u8 als_persist)
{
switch (als_persist) {
case 1:
return TSL2591_PRST_ALS_INT_CYCLE_ANY;
case 2:
return TSL2591_PRST_ALS_INT_CYCLE_2;
case 3:
return TSL2591_PRST_ALS_INT_CYCLE_3;
case 5:
return TSL2591_PRST_ALS_INT_CYCLE_5;
case 10:
return TSL2591_PRST_ALS_INT_CYCLE_10;
case 15:
return TSL2591_PRST_ALS_INT_CYCLE_15;
case 20:
return TSL2591_PRST_ALS_INT_CYCLE_20;
case 25:
return TSL2591_PRST_ALS_INT_CYCLE_25;
case 30:
return TSL2591_PRST_ALS_INT_CYCLE_30;
case 35:
return TSL2591_PRST_ALS_INT_CYCLE_35;
case 40:
return TSL2591_PRST_ALS_INT_CYCLE_40;
case 45:
return TSL2591_PRST_ALS_INT_CYCLE_45;
case 50:
return TSL2591_PRST_ALS_INT_CYCLE_50;
case 55:
return TSL2591_PRST_ALS_INT_CYCLE_55;
case 60:
return TSL2591_PRST_ALS_INT_CYCLE_60;
default:
return -EINVAL;
}
}
static int tsl2591_compatible_int_time(struct tsl2591_chip *chip,
const u32 als_integration_time)
{
switch (als_integration_time) {
case TSL2591_CTRL_ALS_INTEGRATION_100MS:
case TSL2591_CTRL_ALS_INTEGRATION_200MS:
case TSL2591_CTRL_ALS_INTEGRATION_300MS:
case TSL2591_CTRL_ALS_INTEGRATION_400MS:
case TSL2591_CTRL_ALS_INTEGRATION_500MS:
case TSL2591_CTRL_ALS_INTEGRATION_600MS:
return 0;
default:
return -EINVAL;
}
}
static int tsl2591_als_time_to_fval(const u32 als_integration_time)
{
int i;
for (i = 0; i < ARRAY_SIZE(tsl2591_int_time_available); i++) {
if (als_integration_time == tsl2591_int_time_available[i])
return TSL2591_SEC_TO_FVAL(als_integration_time);
}
return -EINVAL;
}
static int tsl2591_compatible_gain(struct tsl2591_chip *chip, const u8 als_gain)
{
switch (als_gain) {
case TSL2591_CTRL_ALS_LOW_GAIN:
case TSL2591_CTRL_ALS_MED_GAIN:
case TSL2591_CTRL_ALS_HIGH_GAIN:
case TSL2591_CTRL_ALS_MAX_GAIN:
return 0;
default:
return -EINVAL;
}
}
static int tsl2591_compatible_als_persist_cycle(struct tsl2591_chip *chip,
const u32 als_persist)
{
switch (als_persist) {
case TSL2591_PRST_ALS_INT_CYCLE_ANY:
case TSL2591_PRST_ALS_INT_CYCLE_2:
case TSL2591_PRST_ALS_INT_CYCLE_3:
case TSL2591_PRST_ALS_INT_CYCLE_5:
case TSL2591_PRST_ALS_INT_CYCLE_10:
case TSL2591_PRST_ALS_INT_CYCLE_15:
case TSL2591_PRST_ALS_INT_CYCLE_20:
case TSL2591_PRST_ALS_INT_CYCLE_25:
case TSL2591_PRST_ALS_INT_CYCLE_30:
case TSL2591_PRST_ALS_INT_CYCLE_35:
case TSL2591_PRST_ALS_INT_CYCLE_40:
case TSL2591_PRST_ALS_INT_CYCLE_45:
case TSL2591_PRST_ALS_INT_CYCLE_50:
case TSL2591_PRST_ALS_INT_CYCLE_55:
case TSL2591_PRST_ALS_INT_CYCLE_60:
return 0;
default:
return -EINVAL;
}
}
static int tsl2591_check_als_valid(struct i2c_client *client)
{
int ret;
ret = i2c_smbus_read_byte_data(client, TSL2591_CMD_NOP | TSL2591_STATUS);
if (ret < 0) {
dev_err(&client->dev, "Failed to read register\n");
return -EINVAL;
}
return FIELD_GET(TSL2591_STS_ALS_VALID_MASK, ret);
}
static int tsl2591_wait_adc_complete(struct tsl2591_chip *chip)
{
struct tsl2591_als_settings settings = chip->als_settings;
struct i2c_client *client = chip->client;
int delay;
int val;
int ret;
delay = TSL2591_FVAL_TO_MSEC(settings.als_int_time);
if (!delay)
return -EINVAL;
/*
* Sleep for ALS integration time to allow enough time or an ADC read
* cycle to complete. Check status after delay for ALS valid.
*/
msleep(delay);
/* Check for status ALS valid flag for up to 100ms */
ret = readx_poll_timeout(tsl2591_check_als_valid, client,
val, val == TSL2591_STS_VAL_HIGH_MASK,
TSL2591_DELAY_PERIOD_US,
TSL2591_DELAY_PERIOD_US * TSL2591_ALS_STS_VALID_COUNT);
if (ret)
dev_err(&client->dev, "Timed out waiting for valid ALS data\n");
return ret;
}
/*
* tsl2591_read_channel_data - Reads raw channel data and calculates lux
*
* Formula for lux calculation;
* Derived from Adafruit's TSL2591 library
* Link: https://github.com/adafruit/Adafruit_TSL2591_Library
* Counts Per Lux (CPL) = (ATIME_ms * AGAIN) / LUX DF
* lux = ((C0DATA - C1DATA) * (1 - (C1DATA / C0DATA))) / CPL
*
* Scale values to get more representative value of lux i.e.
* lux = ((C0DATA - C1DATA) * (1000 - ((C1DATA * 1000) / C0DATA))) / CPL
*
* Channel 0 = IR + Visible
* Channel 1 = IR only
*/
static int tsl2591_read_channel_data(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2)
{
struct tsl2591_chip *chip = iio_priv(indio_dev);
struct tsl2591_als_settings *settings = &chip->als_settings;
struct i2c_client *client = chip->client;
u8 als_data[TSL2591_NUM_DATA_REGISTERS];
int counts_per_lux, int_time_fval, gain_multi, lux;
u16 als_ch0, als_ch1;
int ret;
ret = tsl2591_wait_adc_complete(chip);
if (ret < 0) {
dev_err(&client->dev, "No data available. Err: %d\n", ret);
return ret;
}
ret = i2c_smbus_read_i2c_block_data(client,
TSL2591_CMD_NOP | TSL2591_C0_DATAL,
sizeof(als_data), als_data);
if (ret < 0) {
dev_err(&client->dev, "Failed to read data bytes");
return ret;
}
als_ch0 = get_unaligned_le16(&als_data[0]);
als_ch1 = get_unaligned_le16(&als_data[2]);
switch (chan->type) {
case IIO_INTENSITY:
if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
*val = als_ch0;
else if (chan->channel2 == IIO_MOD_LIGHT_IR)
*val = als_ch1;
else
return -EINVAL;
break;
case IIO_LIGHT:
gain_multi = tsl2591_gain_to_multiplier(settings->als_gain);
if (gain_multi < 0) {
dev_err(&client->dev, "Invalid multiplier");
return gain_multi;
}
int_time_fval = TSL2591_FVAL_TO_MSEC(settings->als_int_time);
/* Calculate counts per lux value */
counts_per_lux = (int_time_fval * gain_multi) / TSL2591_LUX_COEFFICIENT;
dev_dbg(&client->dev, "Counts Per Lux: %d\n", counts_per_lux);
/* Calculate lux value */
lux = ((als_ch0 - als_ch1) *
(1000 - ((als_ch1 * 1000) / als_ch0))) / counts_per_lux;
dev_dbg(&client->dev, "Raw lux calculation: %d\n", lux);
/* Divide by 1000 to get real lux value before scaling */
*val = lux / 1000;
/* Get the decimal part of lux reading */
*val2 = (lux - (*val * 1000)) * 1000;
break;
default:
return -EINVAL;
}
return 0;
}
static int tsl2591_set_als_gain_int_time(struct tsl2591_chip *chip)
{
struct tsl2591_als_settings als_settings = chip->als_settings;
struct i2c_client *client = chip->client;
int ret;
ret = i2c_smbus_write_byte_data(client,
TSL2591_CMD_NOP | TSL2591_CONTROL,
als_settings.als_int_time | als_settings.als_gain);
if (ret)
dev_err(&client->dev, "Failed to set als gain & int time\n");
return ret;
}
static int tsl2591_set_als_lower_threshold(struct tsl2591_chip *chip,
u16 als_lower_threshold)
{
struct tsl2591_als_settings als_settings = chip->als_settings;
struct i2c_client *client = chip->client;
u16 als_upper_threshold;
u8 als_lower_l;
u8 als_lower_h;
int ret;
chip->als_settings.als_lower_thresh = als_lower_threshold;
/*
* Lower threshold should not be greater or equal to upper.
* If this is the case, then assert upper threshold to new lower
* threshold + 1 to avoid ordering issues when setting thresholds.
*/
if (als_lower_threshold >= als_settings.als_upper_thresh) {
als_upper_threshold = als_lower_threshold + 1;
tsl2591_set_als_upper_threshold(chip, als_upper_threshold);
}
als_lower_l = als_lower_threshold;
als_lower_h = als_lower_threshold >> 8;
ret = i2c_smbus_write_byte_data(client,
TSL2591_CMD_NOP | TSL2591_AILTL,
als_lower_l);
if (ret) {
dev_err(&client->dev, "Failed to set als lower threshold\n");
return ret;
}
ret = i2c_smbus_write_byte_data(client,
TSL2591_CMD_NOP | TSL2591_AILTH,
als_lower_h);
if (ret) {
dev_err(&client->dev, "Failed to set als lower threshold\n");
return ret;
}
return 0;
}
static int tsl2591_set_als_upper_threshold(struct tsl2591_chip *chip,
u16 als_upper_threshold)
{
struct tsl2591_als_settings als_settings = chip->als_settings;
struct i2c_client *client = chip->client;
u16 als_lower_threshold;
u8 als_upper_l;
u8 als_upper_h;
int ret;
if (als_upper_threshold > TSL2591_ALS_MAX_VALUE)
return -EINVAL;
chip->als_settings.als_upper_thresh = als_upper_threshold;
/*
* Upper threshold should not be less than lower. If this
* is the case, then assert lower threshold to new upper
* threshold - 1 to avoid ordering issues when setting thresholds.
*/
if (als_upper_threshold < als_settings.als_lower_thresh) {
als_lower_threshold = als_upper_threshold - 1;
tsl2591_set_als_lower_threshold(chip, als_lower_threshold);
}
als_upper_l = als_upper_threshold;
als_upper_h = als_upper_threshold >> 8;
ret = i2c_smbus_write_byte_data(client,
TSL2591_CMD_NOP | TSL2591_AIHTL,
als_upper_l);
if (ret) {
dev_err(&client->dev, "Failed to set als upper threshold\n");
return ret;
}
ret = i2c_smbus_write_byte_data(client,
TSL2591_CMD_NOP | TSL2591_AIHTH,
als_upper_h);
if (ret) {
dev_err(&client->dev, "Failed to set als upper threshold\n");
return ret;
}
return 0;
}
static int tsl2591_set_als_persist_cycle(struct tsl2591_chip *chip,
u8 als_persist)
{
struct i2c_client *client = chip->client;
int ret;
ret = i2c_smbus_write_byte_data(client,
TSL2591_CMD_NOP | TSL2591_PERSIST,
als_persist);
if (ret)
dev_err(&client->dev, "Failed to set als persist cycle\n");
chip->als_settings.als_persist = als_persist;
return ret;
}
static int tsl2591_set_power_state(struct tsl2591_chip *chip, u8 state)
{
struct i2c_client *client = chip->client;
int ret;
ret = i2c_smbus_write_byte_data(client,
TSL2591_CMD_NOP | TSL2591_ENABLE,
state);
if (ret)
dev_err(&client->dev,
"Failed to set the power state to %#04x\n", state);
return ret;
}
static ssize_t tsl2591_in_illuminance_period_available_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct tsl2591_chip *chip = iio_priv(indio_dev);
return sysfs_emit(buf, "%s\n",
tsl2591_als_period_list[chip->als_settings.als_int_time]);
}
static IIO_DEVICE_ATTR_RO(tsl2591_in_illuminance_period_available, 0);
static struct attribute *tsl2591_event_attrs_ctrl[] = {
&iio_dev_attr_tsl2591_in_illuminance_period_available.dev_attr.attr,
NULL
};
static const struct attribute_group tsl2591_event_attribute_group = {
.attrs = tsl2591_event_attrs_ctrl,
};
static const struct iio_event_spec tsl2591_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 iio_chan_spec tsl2591_channels[] = {
{
.type = IIO_INTENSITY,
.modified = 1,
.channel2 = IIO_MOD_LIGHT_IR,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_CALIBSCALE),
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_CALIBSCALE)
},
{
.type = IIO_INTENSITY,
.modified = 1,
.channel2 = IIO_MOD_LIGHT_BOTH,
.event_spec = tsl2591_events,
.num_event_specs = ARRAY_SIZE(tsl2591_events),
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_CALIBSCALE),
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_CALIBSCALE)
},
{
.type = IIO_LIGHT,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_CALIBSCALE),
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME) |
BIT(IIO_CHAN_INFO_CALIBSCALE)
},
};
static int tsl2591_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct tsl2591_chip *chip = iio_priv(indio_dev);
struct i2c_client *client = chip->client;
int ret;
pm_runtime_get_sync(&client->dev);
mutex_lock(&chip->als_mutex);
switch (mask) {
case IIO_CHAN_INFO_RAW:
if (chan->type != IIO_INTENSITY) {
ret = -EINVAL;
goto err_unlock;
}
ret = tsl2591_read_channel_data(indio_dev, chan, val, val2);
if (ret < 0)
goto err_unlock;
ret = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_PROCESSED:
if (chan->type != IIO_LIGHT) {
ret = -EINVAL;
goto err_unlock;
}
ret = tsl2591_read_channel_data(indio_dev, chan, val, val2);
if (ret < 0)
break;
ret = IIO_VAL_INT_PLUS_MICRO;
break;
case IIO_CHAN_INFO_INT_TIME:
if (chan->type != IIO_INTENSITY) {
ret = -EINVAL;
goto err_unlock;
}
*val = TSL2591_FVAL_TO_SEC(chip->als_settings.als_int_time);
ret = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_CALIBSCALE:
if (chan->type != IIO_INTENSITY) {
ret = -EINVAL;
goto err_unlock;
}
*val = tsl2591_gain_to_multiplier(chip->als_settings.als_gain);
ret = IIO_VAL_INT;
break;
default:
ret = -EINVAL;
break;
}
err_unlock:
mutex_unlock(&chip->als_mutex);
pm_runtime_mark_last_busy(&client->dev);
pm_runtime_put_autosuspend(&client->dev);
return ret;
}
static int tsl2591_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct tsl2591_chip *chip = iio_priv(indio_dev);
int int_time;
int gain;
int ret;
mutex_lock(&chip->als_mutex);
switch (mask) {
case IIO_CHAN_INFO_INT_TIME:
int_time = tsl2591_als_time_to_fval(val);
if (int_time < 0) {
ret = int_time;
goto err_unlock;
}
ret = tsl2591_compatible_int_time(chip, int_time);
if (ret < 0)
goto err_unlock;
chip->als_settings.als_int_time = int_time;
break;
case IIO_CHAN_INFO_CALIBSCALE:
gain = tsl2591_multiplier_to_gain(val);
if (gain < 0) {
ret = gain;
goto err_unlock;
}
ret = tsl2591_compatible_gain(chip, gain);
if (ret < 0)
goto err_unlock;
chip->als_settings.als_gain = gain;
break;
default:
ret = -EINVAL;
goto err_unlock;
}
ret = tsl2591_set_als_gain_int_time(chip);
err_unlock:
mutex_unlock(&chip->als_mutex);
return ret;
}
static int tsl2591_read_available(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
const int **vals, int *type, int *length,
long mask)
{
switch (mask) {
case IIO_CHAN_INFO_INT_TIME:
*length = ARRAY_SIZE(tsl2591_int_time_available);
*vals = tsl2591_int_time_available;
*type = IIO_VAL_INT;
return IIO_AVAIL_LIST;
case IIO_CHAN_INFO_CALIBSCALE:
*length = ARRAY_SIZE(tsl2591_calibscale_available);
*vals = tsl2591_calibscale_available;
*type = IIO_VAL_INT;
return IIO_AVAIL_LIST;
default:
return -EINVAL;
}
}
static int tsl2591_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 tsl2591_chip *chip = iio_priv(indio_dev);
struct i2c_client *client = chip->client;
int als_persist, int_time, period;
int ret;
mutex_lock(&chip->als_mutex);
switch (info) {
case IIO_EV_INFO_VALUE:
switch (dir) {
case IIO_EV_DIR_RISING:
*val = chip->als_settings.als_upper_thresh;
break;
case IIO_EV_DIR_FALLING:
*val = chip->als_settings.als_lower_thresh;
break;
default:
ret = -EINVAL;
goto err_unlock;
}
ret = IIO_VAL_INT;
break;
case IIO_EV_INFO_PERIOD:
ret = i2c_smbus_read_byte_data(client,
TSL2591_CMD_NOP | TSL2591_PERSIST);
if (ret <= 0 || ret > TSL2591_PRST_ALS_INT_CYCLE_MAX)
goto err_unlock;
als_persist = tsl2591_persist_cycle_to_lit(ret);
int_time = TSL2591_FVAL_TO_MSEC(chip->als_settings.als_int_time);
period = als_persist * (int_time * MSEC_PER_SEC);
*val = period / USEC_PER_SEC;
*val2 = period % USEC_PER_SEC;
ret = IIO_VAL_INT_PLUS_MICRO;
break;
default:
ret = -EINVAL;
break;
}
err_unlock:
mutex_unlock(&chip->als_mutex);
return ret;
}
static int tsl2591_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 tsl2591_chip *chip = iio_priv(indio_dev);
int period, int_time, als_persist;
int ret;
if (val < 0 || val2 < 0)
return -EINVAL;
mutex_lock(&chip->als_mutex);
switch (info) {
case IIO_EV_INFO_VALUE:
if (val > TSL2591_ALS_MAX_VALUE) {
ret = -EINVAL;
goto err_unlock;
}
switch (dir) {
case IIO_EV_DIR_RISING:
ret = tsl2591_set_als_upper_threshold(chip, val);
if (ret < 0)
goto err_unlock;
break;
case IIO_EV_DIR_FALLING:
ret = tsl2591_set_als_lower_threshold(chip, val);
if (ret < 0)
goto err_unlock;
break;
default:
ret = -EINVAL;
goto err_unlock;
}
break;
case IIO_EV_INFO_PERIOD:
int_time = TSL2591_FVAL_TO_MSEC(chip->als_settings.als_int_time);
period = ((val * MSEC_PER_SEC) +
(val2 / MSEC_PER_SEC)) / int_time;
als_persist = tsl2591_persist_lit_to_cycle(period);
if (als_persist < 0) {
ret = -EINVAL;
goto err_unlock;
}
ret = tsl2591_compatible_als_persist_cycle(chip, als_persist);
if (ret < 0)
goto err_unlock;
ret = tsl2591_set_als_persist_cycle(chip, als_persist);
if (ret < 0)
goto err_unlock;
break;
default:
ret = -EINVAL;
break;
}
err_unlock:
mutex_unlock(&chip->als_mutex);
return ret;
}
static int tsl2591_read_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir)
{
struct tsl2591_chip *chip = iio_priv(indio_dev);
return chip->events_enabled;
}
static int tsl2591_write_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
int state)
{
struct tsl2591_chip *chip = iio_priv(indio_dev);
struct i2c_client *client = chip->client;
if (state && !chip->events_enabled) {
chip->events_enabled = true;
pm_runtime_get_sync(&client->dev);
} else if (!state && chip->events_enabled) {
chip->events_enabled = false;
pm_runtime_mark_last_busy(&client->dev);
pm_runtime_put_autosuspend(&client->dev);
}
return 0;
}
static const struct iio_info tsl2591_info = {
.event_attrs = &tsl2591_event_attribute_group,
.read_raw = tsl2591_read_raw,
.write_raw = tsl2591_write_raw,
.read_avail = tsl2591_read_available,
.read_event_value = tsl2591_read_event_value,
.write_event_value = tsl2591_write_event_value,
.read_event_config = tsl2591_read_event_config,
.write_event_config = tsl2591_write_event_config,
};
static const struct iio_info tsl2591_info_no_irq = {
.read_raw = tsl2591_read_raw,
.write_raw = tsl2591_write_raw,
.read_avail = tsl2591_read_available,
};
static int tsl2591_suspend(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2591_chip *chip = iio_priv(indio_dev);
int ret;
mutex_lock(&chip->als_mutex);
ret = tsl2591_set_power_state(chip, TSL2591_PWR_OFF);
mutex_unlock(&chip->als_mutex);
return ret;
}
static int tsl2591_resume(struct device *dev)
{
int power_state = TSL2591_PWR_ON | TSL2591_ENABLE_ALS;
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2591_chip *chip = iio_priv(indio_dev);
int ret;
if (chip->events_enabled)
power_state |= TSL2591_ENABLE_ALS_INT;
mutex_lock(&chip->als_mutex);
ret = tsl2591_set_power_state(chip, power_state);
mutex_unlock(&chip->als_mutex);
return ret;
}
static DEFINE_RUNTIME_DEV_PM_OPS(tsl2591_pm_ops, tsl2591_suspend,
tsl2591_resume, NULL);
static irqreturn_t tsl2591_event_handler(int irq, void *private)
{
struct iio_dev *dev_info = private;
struct tsl2591_chip *chip = iio_priv(dev_info);
struct i2c_client *client = chip->client;
if (!chip->events_enabled)
return IRQ_NONE;
iio_push_event(dev_info,
IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0,
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_EITHER),
iio_get_time_ns(dev_info));
/* Clear ALS irq */
i2c_smbus_write_byte(client, TSL2591_CMD_SF_CALS_NPI);
return IRQ_HANDLED;
}
static int tsl2591_load_defaults(struct tsl2591_chip *chip)
{
int ret;
chip->als_settings.als_int_time = TSL2591_DEFAULT_ALS_INT_TIME;
chip->als_settings.als_gain = TSL2591_DEFAULT_ALS_GAIN;
chip->als_settings.als_lower_thresh = TSL2591_DEFAULT_ALS_LOWER_THRESH;
chip->als_settings.als_upper_thresh = TSL2591_DEFAULT_ALS_UPPER_THRESH;
ret = tsl2591_set_als_gain_int_time(chip);
if (ret < 0)
return ret;
ret = tsl2591_set_als_persist_cycle(chip, TSL2591_DEFAULT_ALS_PERSIST);
if (ret < 0)
return ret;
ret = tsl2591_set_als_lower_threshold(chip, TSL2591_DEFAULT_ALS_LOWER_THRESH);
if (ret < 0)
return ret;
ret = tsl2591_set_als_upper_threshold(chip, TSL2591_DEFAULT_ALS_UPPER_THRESH);
if (ret < 0)
return ret;
return 0;
}
static void tsl2591_chip_off(void *data)
{
struct iio_dev *indio_dev = data;
struct tsl2591_chip *chip = iio_priv(indio_dev);
struct i2c_client *client = chip->client;
pm_runtime_disable(&client->dev);
pm_runtime_set_suspended(&client->dev);
pm_runtime_put_noidle(&client->dev);
tsl2591_set_power_state(chip, TSL2591_PWR_OFF);
}
static int tsl2591_probe(struct i2c_client *client)
{
struct tsl2591_chip *chip;
struct iio_dev *indio_dev;
int ret;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_err(&client->dev,
"I2C smbus byte data functionality is not supported\n");
return -EOPNOTSUPP;
}
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
if (!indio_dev)
return -ENOMEM;
chip = iio_priv(indio_dev);
chip->client = client;
i2c_set_clientdata(client, indio_dev);
if (client->irq) {
ret = devm_request_threaded_irq(&client->dev, client->irq,
NULL, tsl2591_event_handler,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"tsl2591_irq", indio_dev);
if (ret) {
dev_err_probe(&client->dev, ret, "IRQ request error\n");
return -EINVAL;
}
indio_dev->info = &tsl2591_info;
} else {
indio_dev->info = &tsl2591_info_no_irq;
}
mutex_init(&chip->als_mutex);
ret = i2c_smbus_read_byte_data(client,
TSL2591_CMD_NOP | TSL2591_DEVICE_ID);
if (ret < 0) {
dev_err(&client->dev,
"Failed to read the device ID register\n");
return ret;
}
ret = FIELD_GET(TSL2591_DEVICE_ID_MASK, ret);
if (ret != TSL2591_DEVICE_ID_VAL) {
dev_err(&client->dev, "Device ID: %#04x unknown\n", ret);
return -EINVAL;
}
indio_dev->channels = tsl2591_channels;
indio_dev->num_channels = ARRAY_SIZE(tsl2591_channels);
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->name = chip->client->name;
chip->events_enabled = false;
pm_runtime_enable(&client->dev);
pm_runtime_set_autosuspend_delay(&client->dev,
TSL2591_POWER_OFF_DELAY_MS);
pm_runtime_use_autosuspend(&client->dev);
/*
* Add chip off to automatically managed path and disable runtime
* power management. This ensures that the chip power management
* is handled correctly on driver remove. tsl2591_chip_off() must be
* added to the managed path after pm runtime is enabled and before
* any error exit paths are met to ensure we're not left in a state
* of pm runtime not being disabled properly.
*/
ret = devm_add_action_or_reset(&client->dev, tsl2591_chip_off,
indio_dev);
if (ret < 0)
return -EINVAL;
ret = tsl2591_load_defaults(chip);
if (ret < 0) {
dev_err(&client->dev, "Failed to load sensor defaults\n");
return -EINVAL;
}
ret = i2c_smbus_write_byte(client, TSL2591_CMD_SF_CALS_NPI);
if (ret < 0) {
dev_err(&client->dev, "Failed to clear als irq\n");
return -EINVAL;
}
return devm_iio_device_register(&client->dev, indio_dev);
}
static const struct of_device_id tsl2591_of_match[] = {
{ .compatible = "amstaos,tsl2591"},
{}
};
MODULE_DEVICE_TABLE(of, tsl2591_of_match);
static struct i2c_driver tsl2591_driver = {
.driver = {
.name = "tsl2591",
.pm = pm_ptr(&tsl2591_pm_ops),
.of_match_table = tsl2591_of_match,
},
.probe_new = tsl2591_probe
};
module_i2c_driver(tsl2591_driver);
MODULE_AUTHOR("Joe Sandom <joe.g.sandom@gmail.com>");
MODULE_DESCRIPTION("TAOS tsl2591 ambient light sensor driver");
MODULE_LICENSE("GPL");