diff options
author | Brian Masney <masneyb@onstation.org> | 2018-05-10 20:12:23 -0400 |
---|---|---|
committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2018-05-12 12:40:04 +0100 |
commit | c06c4d793584b965bf5fa3fb107f6279643574e2 (patch) | |
tree | 1b4a003ad15dc6d519613544b2a3fc74fa569a4f /drivers/iio/light | |
parent | 4e24c1719f3485780b2be559e5fc11d091139935 (diff) |
staging: iio: tsl2x7x/tsl2772: move out of staging
Move the tsl2772 driver out of staging and into mainline.
Signed-off-by: Brian Masney <masneyb@onstation.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/light')
-rw-r--r-- | drivers/iio/light/Kconfig | 8 | ||||
-rw-r--r-- | drivers/iio/light/Makefile | 1 | ||||
-rw-r--r-- | drivers/iio/light/tsl2772.c | 1800 |
3 files changed, 1809 insertions, 0 deletions
diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig index 074e50657366..c7ef8d1862d6 100644 --- a/drivers/iio/light/Kconfig +++ b/drivers/iio/light/Kconfig @@ -409,6 +409,14 @@ config TSL2583 Provides support for the TAOS tsl2580, tsl2581 and tsl2583 devices. Access ALS data via iio, sysfs. +config TSL2772 + tristate "TAOS TSL/TMD2x71 and TSL/TMD2x72 Family of light and proximity sensors" + depends on I2C + help + Support for: tsl2571, tsl2671, tmd2671, tsl2771, tmd2771, tsl2572, tsl2672, + tmd2672, tsl2772, tmd2772 devices. + Provides iio_events and direct access via sysfs. + config TSL4531 tristate "TAOS TSL4531 ambient light sensors" depends on I2C diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile index f1777036d4f8..80943af5d627 100644 --- a/drivers/iio/light/Makefile +++ b/drivers/iio/light/Makefile @@ -40,6 +40,7 @@ obj-$(CONFIG_ST_UVIS25_SPI) += st_uvis25_spi.o obj-$(CONFIG_TCS3414) += tcs3414.o obj-$(CONFIG_TCS3472) += tcs3472.o obj-$(CONFIG_TSL2583) += tsl2583.o +obj-$(CONFIG_TSL2772) += tsl2772.o obj-$(CONFIG_TSL4531) += tsl4531.o obj-$(CONFIG_US5182D) += us5182d.o obj-$(CONFIG_VCNL4000) += vcnl4000.o diff --git a/drivers/iio/light/tsl2772.c b/drivers/iio/light/tsl2772.c new file mode 100644 index 000000000000..34d42a2504c9 --- /dev/null +++ b/drivers/iio/light/tsl2772.c @@ -0,0 +1,1800 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Device driver for monitoring ambient light intensity in (lux) and proximity + * detection (prox) within 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 + +#define TSL2772_ALS_GAIN_TRIM_MIN 250 +#define TSL2772_ALS_GAIN_TRIM_MAX 4000 + +/* 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 +}; + +static const int tsl2772_int_time_avail[][6] = { + [tsl2571] = { 0, 2720, 0, 2720, 0, 696000 }, + [tsl2671] = { 0, 2720, 0, 2720, 0, 696000 }, + [tmd2671] = { 0, 2720, 0, 2720, 0, 696000 }, + [tsl2771] = { 0, 2720, 0, 2720, 0, 696000 }, + [tmd2771] = { 0, 2720, 0, 2720, 0, 696000 }, + [tsl2572] = { 0, 2730, 0, 2730, 0, 699000 }, + [tsl2672] = { 0, 2730, 0, 2730, 0, 699000 }, + [tmd2672] = { 0, 2730, 0, 2730, 0, 699000 }, + [tsl2772] = { 0, 2730, 0, 2730, 0, 699000 }, + [tmd2772] = { 0, 2730, 0, 2730, 0, 699000 }, +}; + +static int tsl2772_int_calibscale_avail[] = { 1, 8, 16, 120 }; + +static int tsl2772_prox_calibscale_avail[] = { 1, 2, 4, 8 }; + +/* 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 < TSL2772_ALS_GAIN_TRIM_MIN || ret > TSL2772_ALS_GAIN_TRIM_MAX) + 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_avail[chip->id][3]; + 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 int tsl2772_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int **vals, int *type, int *length, + long mask) +{ + struct tsl2772_chip *chip = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_CALIBSCALE: + if (chan->type == IIO_INTENSITY) { + *length = ARRAY_SIZE(tsl2772_int_calibscale_avail); + *vals = tsl2772_int_calibscale_avail; + } else { + *length = ARRAY_SIZE(tsl2772_prox_calibscale_avail); + *vals = tsl2772_prox_calibscale_avail; + } + *type = IIO_VAL_INT; + return IIO_AVAIL_LIST; + case IIO_CHAN_INFO_INT_TIME: + *length = ARRAY_SIZE(tsl2772_int_time_avail[chip->id]); + *vals = tsl2772_int_time_avail[chip->id]; + *type = IIO_VAL_INT_PLUS_MICRO; + return IIO_AVAIL_RANGE; + } + + return -EINVAL; +} + +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_avail[chip->id][3]); + + 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 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; + return IIO_VAL_INT; + case IIO_EV_DIR_FALLING: + *val = chip->settings.als_thresh_low; + return IIO_VAL_INT; + default: + return -EINVAL; + } + } else { + switch (dir) { + case IIO_EV_DIR_RISING: + *val = chip->settings.prox_thres_high; + return IIO_VAL_INT; + case IIO_EV_DIR_FALLING: + *val = chip->settings.prox_thres_low; + return IIO_VAL_INT; + default: + return -EINVAL; + } + } + 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_avail[chip->id][3]; + + *val = filter_delay / 1000000; + *val2 = filter_delay % 1000000; + return IIO_VAL_INT_PLUS_MICRO; + default: + return -EINVAL; + } +} + +static int tsl2772_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, |