diff options
Diffstat (limited to 'drivers/iio/light/veml6030.c')
| -rw-r--r-- | drivers/iio/light/veml6030.c | 1242 |
1 files changed, 1242 insertions, 0 deletions
diff --git a/drivers/iio/light/veml6030.c b/drivers/iio/light/veml6030.c new file mode 100644 index 000000000000..6bcacae3863c --- /dev/null +++ b/drivers/iio/light/veml6030.c @@ -0,0 +1,1242 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * VEML6030, VMEL6035 and VEML7700 Ambient Light Sensors + * + * Copyright (c) 2019, Rishi Gupta <gupt21@gmail.com> + * + * VEML6030: + * Datasheet: https://www.vishay.com/docs/84366/veml6030.pdf + * Appnote-84367: https://www.vishay.com/docs/84367/designingveml6030.pdf + * + * VEML6035: + * Datasheet: https://www.vishay.com/docs/84889/veml6035.pdf + * Appnote-84944: https://www.vishay.com/docs/84944/designingveml6035.pdf + * + * VEML7700: + * Datasheet: https://www.vishay.com/docs/84286/veml7700.pdf + * Appnote-84323: https://www.vishay.com/docs/84323/designingveml7700.pdf + */ + +#include <linux/bitfield.h> +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/err.h> +#include <linux/regmap.h> +#include <linux/interrupt.h> +#include <linux/pm_runtime.h> +#include <linux/units.h> +#include <linux/regulator/consumer.h> +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/events.h> +#include <linux/iio/iio-gts-helper.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/triggered_buffer.h> + +/* Device registers */ +#define VEML6030_REG_ALS_CONF 0x00 +#define VEML6030_REG_ALS_WH 0x01 +#define VEML6030_REG_ALS_WL 0x02 +#define VEML6030_REG_ALS_PSM 0x03 +#define VEML6030_REG_ALS_DATA 0x04 +#define VEML6030_REG_WH_DATA 0x05 +#define VEML6030_REG_ALS_INT 0x06 +#define VEML6030_REG_DATA(ch) (VEML6030_REG_ALS_DATA + (ch)) + +/* Bit masks for specific functionality */ +#define VEML6030_ALS_IT GENMASK(9, 6) +#define VEML6030_PSM GENMASK(2, 1) +#define VEML6030_ALS_PERS GENMASK(5, 4) +#define VEML6030_ALS_GAIN GENMASK(12, 11) +#define VEML6030_PSM_EN BIT(0) +#define VEML6030_INT_TH_LOW BIT(15) +#define VEML6030_INT_TH_HIGH BIT(14) +#define VEML6030_ALS_INT_EN BIT(1) +#define VEML6030_ALS_SD BIT(0) + +#define VEML6035_GAIN_M GENMASK(12, 10) +#define VEML6035_GAIN BIT(10) +#define VEML6035_DG BIT(11) +#define VEML6035_SENS BIT(12) +#define VEML6035_INT_CHAN BIT(3) +#define VEML6035_CHAN_EN BIT(2) + +/* Regfields */ +#define VEML6030_GAIN_RF REG_FIELD(VEML6030_REG_ALS_CONF, 11, 12) +#define VEML6030_IT_RF REG_FIELD(VEML6030_REG_ALS_CONF, 6, 9) + +#define VEML6035_GAIN_RF REG_FIELD(VEML6030_REG_ALS_CONF, 10, 12) + +/* Maximum scales x 10000 to work with integers */ +#define VEML6030_MAX_SCALE 21504 +#define VEML6035_MAX_SCALE 4096 + +enum veml6030_scan { + VEML6030_SCAN_ALS, + VEML6030_SCAN_WH, + VEML6030_SCAN_TIMESTAMP, +}; + +struct veml6030_rf { + struct regmap_field *it; + struct regmap_field *gain; +}; + +struct veml603x_chip { + const char *name; + const struct iio_chan_spec *channels; + const int num_channels; + const struct reg_field gain_rf; + const struct reg_field it_rf; + const int max_scale; + int (*hw_init)(struct iio_dev *indio_dev, struct device *dev); + int (*set_info)(struct iio_dev *indio_dev); +}; + +/* + * The resolution depends on both gain and integration time. The + * cur_resolution stores one of the resolution mentioned in the + * table during startup and gets updated whenever integration time + * or gain is changed. + * + * Table 'resolution and maximum detection range' in the appnotes + * is visualized as a 2D array. The cur_gain stores index of gain + * in this table (0-3 for VEML6030, 0-5 for VEML6035) while the + * cur_integration_time holds index of integration time (0-5). + */ +struct veml6030_data { + struct i2c_client *client; + struct regmap *regmap; + struct veml6030_rf rf; + const struct veml603x_chip *chip; + struct iio_gts gts; + +}; + +#define VEML6030_SEL_IT_25MS 0x0C +#define VEML6030_SEL_IT_50MS 0x08 +#define VEML6030_SEL_IT_100MS 0x00 +#define VEML6030_SEL_IT_200MS 0x01 +#define VEML6030_SEL_IT_400MS 0x02 +#define VEML6030_SEL_IT_800MS 0x03 +static const struct iio_itime_sel_mul veml6030_it_sel[] = { + GAIN_SCALE_ITIME_US(25000, VEML6030_SEL_IT_25MS, 1), + GAIN_SCALE_ITIME_US(50000, VEML6030_SEL_IT_50MS, 2), + GAIN_SCALE_ITIME_US(100000, VEML6030_SEL_IT_100MS, 4), + GAIN_SCALE_ITIME_US(200000, VEML6030_SEL_IT_200MS, 8), + GAIN_SCALE_ITIME_US(400000, VEML6030_SEL_IT_400MS, 16), + GAIN_SCALE_ITIME_US(800000, VEML6030_SEL_IT_800MS, 32), +}; + +/* Gains are multiplied by 8 to work with integers. The values in the + * iio-gts tables don't need corrections because the maximum value of + * the scale refers to GAIN = x1, and the rest of the values are + * obtained from the resulting linear function. + */ +#define VEML6030_SEL_MILLI_GAIN_X125 2 +#define VEML6030_SEL_MILLI_GAIN_X250 3 +#define VEML6030_SEL_MILLI_GAIN_X1000 0 +#define VEML6030_SEL_MILLI_GAIN_X2000 1 +static const struct iio_gain_sel_pair veml6030_gain_sel[] = { + GAIN_SCALE_GAIN(1, VEML6030_SEL_MILLI_GAIN_X125), + GAIN_SCALE_GAIN(2, VEML6030_SEL_MILLI_GAIN_X250), + GAIN_SCALE_GAIN(8, VEML6030_SEL_MILLI_GAIN_X1000), + GAIN_SCALE_GAIN(16, VEML6030_SEL_MILLI_GAIN_X2000), +}; + +#define VEML6035_SEL_MILLI_GAIN_X125 4 +#define VEML6035_SEL_MILLI_GAIN_X250 5 +#define VEML6035_SEL_MILLI_GAIN_X500 7 +#define VEML6035_SEL_MILLI_GAIN_X1000 0 +#define VEML6035_SEL_MILLI_GAIN_X2000 1 +#define VEML6035_SEL_MILLI_GAIN_X4000 3 +static const struct iio_gain_sel_pair veml6035_gain_sel[] = { + GAIN_SCALE_GAIN(1, VEML6035_SEL_MILLI_GAIN_X125), + GAIN_SCALE_GAIN(2, VEML6035_SEL_MILLI_GAIN_X250), + GAIN_SCALE_GAIN(4, VEML6035_SEL_MILLI_GAIN_X500), + GAIN_SCALE_GAIN(8, VEML6035_SEL_MILLI_GAIN_X1000), + GAIN_SCALE_GAIN(16, VEML6035_SEL_MILLI_GAIN_X2000), + GAIN_SCALE_GAIN(32, VEML6035_SEL_MILLI_GAIN_X4000), +}; + +/* + * Persistence = 1/2/4/8 x integration time + * Minimum time for which light readings must stay above configured + * threshold to assert the interrupt. + */ +static const char * const period_values[] = { + "0.1 0.2 0.4 0.8", + "0.2 0.4 0.8 1.6", + "0.4 0.8 1.6 3.2", + "0.8 1.6 3.2 6.4", + "0.05 0.1 0.2 0.4", + "0.025 0.050 0.1 0.2" +}; + +/* + * Return list of valid period values in seconds corresponding to + * the currently active integration time. + */ +static ssize_t in_illuminance_period_available_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct veml6030_data *data = iio_priv(dev_to_iio_dev(dev)); + int ret, reg, x; + + ret = regmap_read(data->regmap, VEML6030_REG_ALS_CONF, ®); + if (ret) { + dev_err(&data->client->dev, + "can't read als conf register %d\n", ret); + return ret; + } + + ret = ((reg >> 6) & 0xF); + switch (ret) { + case 0: + case 1: + case 2: + case 3: + x = ret; + break; + case 8: + x = 4; + break; + case 12: + x = 5; + break; + default: + return -EINVAL; + } + + return sysfs_emit(buf, "%s\n", period_values[x]); +} + +static IIO_DEVICE_ATTR_RO(in_illuminance_period_available, 0); + +static struct attribute *veml6030_event_attributes[] = { + &iio_dev_attr_in_illuminance_period_available.dev_attr.attr, + NULL +}; + +static const struct attribute_group veml6030_event_attr_group = { + .attrs = veml6030_event_attributes, +}; + +static int veml6030_als_pwr_on(struct veml6030_data *data) +{ + int ret; + + ret = regmap_clear_bits(data->regmap, VEML6030_REG_ALS_CONF, + VEML6030_ALS_SD); + if (ret) + return ret; + + /* Wait 4 ms to let processor & oscillator start correctly */ + fsleep(4000); + + return 0; +} + +static int veml6030_als_shut_down(struct veml6030_data *data) +{ + return regmap_set_bits(data->regmap, VEML6030_REG_ALS_CONF, + VEML6030_ALS_SD); +} + +static void veml6030_als_shut_down_action(void *data) +{ + veml6030_als_shut_down(data); +} + +static const struct iio_event_spec veml6030_event_spec[] = { + { + .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), + }, +}; + +/* Channel number */ +enum veml6030_chan { + CH_ALS, + CH_WHITE, +}; + +static const struct iio_chan_spec veml6030_channels[] = { + { + .type = IIO_LIGHT, + .channel = CH_ALS, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_PROCESSED) | + BIT(IIO_CHAN_INFO_INT_TIME) | + BIT(IIO_CHAN_INFO_SCALE), + .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) | + BIT(IIO_CHAN_INFO_SCALE), + .event_spec = veml6030_event_spec, + .num_event_specs = ARRAY_SIZE(veml6030_event_spec), + .scan_index = VEML6030_SCAN_ALS, + .scan_type = { + .sign = 'u', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_CPU, + }, + }, + { + .type = IIO_INTENSITY, + .channel = CH_WHITE, + .modified = 1, + .channel2 = IIO_MOD_LIGHT_BOTH, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_INT_TIME) | + BIT(IIO_CHAN_INFO_SCALE), + .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) | + BIT(IIO_CHAN_INFO_SCALE), + .scan_index = VEML6030_SCAN_WH, + .scan_type = { + .sign = 'u', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_CPU, + }, + }, + IIO_CHAN_SOFT_TIMESTAMP(VEML6030_SCAN_TIMESTAMP), +}; + +static const struct iio_chan_spec veml7700_channels[] = { + { + .type = IIO_LIGHT, + .channel = CH_ALS, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_PROCESSED) | + BIT(IIO_CHAN_INFO_INT_TIME) | + BIT(IIO_CHAN_INFO_SCALE), + .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) | + BIT(IIO_CHAN_INFO_SCALE), + .scan_index = VEML6030_SCAN_ALS, + .scan_type = { + .sign = 'u', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_CPU, + }, + }, + { + .type = IIO_INTENSITY, + .channel = CH_WHITE, + .modified = 1, + .channel2 = IIO_MOD_LIGHT_BOTH, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_INT_TIME) | + BIT(IIO_CHAN_INFO_SCALE), + .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) | + BIT(IIO_CHAN_INFO_SCALE), + .scan_index = VEML6030_SCAN_WH, + .scan_type = { + .sign = 'u', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_CPU, + }, + }, + IIO_CHAN_SOFT_TIMESTAMP(VEML6030_SCAN_TIMESTAMP), +}; + +static const struct regmap_range veml6030_readable_ranges[] = { + regmap_reg_range(VEML6030_REG_ALS_CONF, VEML6030_REG_ALS_INT), +}; + +static const struct regmap_access_table veml6030_readable_table = { + .yes_ranges = veml6030_readable_ranges, + .n_yes_ranges = ARRAY_SIZE(veml6030_readable_ranges), +}; + +static const struct regmap_range veml6030_writable_ranges[] = { + regmap_reg_range(VEML6030_REG_ALS_CONF, VEML6030_REG_ALS_PSM), +}; + +static const struct regmap_access_table veml6030_writable_table = { + .yes_ranges = veml6030_writable_ranges, + .n_yes_ranges = ARRAY_SIZE(veml6030_writable_ranges), +}; + +static const struct regmap_range veml6030_volatile_ranges[] = { + regmap_reg_range(VEML6030_REG_ALS_DATA, VEML6030_REG_WH_DATA), +}; + +static const struct regmap_access_table veml6030_volatile_table = { + .yes_ranges = veml6030_volatile_ranges, + .n_yes_ranges = ARRAY_SIZE(veml6030_volatile_ranges), +}; + +static const struct regmap_config veml6030_regmap_config = { + .name = "veml6030_regmap", + .reg_bits = 8, + .val_bits = 16, + .max_register = VEML6030_REG_ALS_INT, + .val_format_endian = REGMAP_ENDIAN_LITTLE, + .rd_table = &veml6030_readable_table, + .wr_table = &veml6030_writable_table, + .volatile_table = &veml6030_volatile_table, + .cache_type = REGCACHE_RBTREE, +}; + +static int veml6030_get_it(struct veml6030_data *data, int *val, int *val2) +{ + int ret, it_idx; + + ret = regmap_field_read(data->rf.it, &it_idx); + if (ret) + return ret; + + ret = iio_gts_find_int_time_by_sel(&data->gts, it_idx); + if (ret < 0) + return ret; + + *val2 = ret; + *val = 0; + + return IIO_VAL_INT_PLUS_MICRO; +} + +static int veml6030_set_it(struct iio_dev *indio_dev, int val, int val2) +{ + struct veml6030_data *data = iio_priv(indio_dev); + int ret, gain_idx, it_idx, new_gain, prev_gain, prev_it; + bool in_range; + + if (val || !iio_gts_valid_time(&data->gts, val2)) + return -EINVAL; + + ret = regmap_field_read(data->rf.it, &it_idx); + if (ret) + return ret; + + ret = regmap_field_read(data->rf.gain, &gain_idx); + if (ret) + return ret; + + prev_it = iio_gts_find_int_time_by_sel(&data->gts, it_idx); + if (prev_it < 0) + return prev_it; + + if (prev_it == val2) + return 0; + + prev_gain = iio_gts_find_gain_by_sel(&data->gts, gain_idx); + if (prev_gain < 0) + return prev_gain; + + ret = iio_gts_find_new_gain_by_gain_time_min(&data->gts, prev_gain, prev_it, + val2, &new_gain, &in_range); + if (ret) + return ret; + + if (!in_range) + dev_dbg(&data->client->dev, "Optimal gain out of range\n"); + + ret = iio_gts_find_sel_by_int_time(&data->gts, val2); + if (ret < 0) + return ret; + + ret = regmap_field_write(data->rf.it, ret); + if (ret) + return ret; + + ret = iio_gts_find_sel_by_gain(&data->gts, new_gain); + if (ret < 0) + return ret; + + return regmap_field_write(data->rf.gain, ret); +} + +static int veml6030_read_persistence(struct iio_dev *indio_dev, + int *val, int *val2) +{ + int ret, reg, period, x, y; + struct veml6030_data *data = iio_priv(indio_dev); + + ret = veml6030_get_it(data, &x, &y); + if (ret < 0) + return ret; + + ret = regmap_read(data->regmap, VEML6030_REG_ALS_CONF, ®); + if (ret) { + dev_err(&data->client->dev, + "can't read als conf register %d\n", ret); + } + + /* integration time multiplied by 1/2/4/8 */ + period = y * (1 << ((reg >> 4) & 0x03)); + + *val = period / 1000000; + *val2 = period % 1000000; + + return IIO_VAL_INT_PLUS_MICRO; +} + +static int veml6030_write_persistence(struct iio_dev *indio_dev, + int val, int val2) +{ + int ret, period, x, y; + struct veml6030_data *data = iio_priv(indio_dev); + + ret = veml6030_get_it(data, &x, &y); + if (ret < 0) + return ret; + + if (!val) { + period = val2 / y; + } else { + if ((val == 1) && (val2 == 600000)) + period = 1600000 / y; + else if ((val == 3) && (val2 == 200000)) + period = 3200000 / y; + else if ((val == 6) && (val2 == 400000)) + period = 6400000 / y; + else + period = -1; + } + + if (period <= 0 || period > 8 || hweight8(period) != 1) + return -EINVAL; + + ret = regmap_update_bits(data->regmap, VEML6030_REG_ALS_CONF, + VEML6030_ALS_PERS, (ffs(period) - 1) << 4); + if (ret) + dev_err(&data->client->dev, + "can't set persistence value %d\n", ret); + + return ret; +} + +static int veml6030_set_scale(struct iio_dev *indio_dev, int val, int val2) +{ + int ret, gain_sel, it_idx, it_sel; + struct veml6030_data *data = iio_priv(indio_dev); + + ret = regmap_field_read(data->rf.it, &it_idx); + if (ret) + return ret; + + ret = iio_gts_find_gain_time_sel_for_scale(&data->gts, val, val2, + &gain_sel, &it_sel); + if (ret) + return ret; + + ret = regmap_field_write(data->rf.it, it_sel); + if (ret) + return ret; + + ret = regmap_field_write(data->rf.gain, gain_sel); + if (ret) + return ret; + + return 0; +} + +static int veml6030_read_thresh(struct iio_dev *indio_dev, + int *val, int *val2, int dir) +{ + int ret, reg; + struct veml6030_data *data = iio_priv(indio_dev); + + if (dir == IIO_EV_DIR_RISING) + ret = regmap_read(data->regmap, VEML6030_REG_ALS_WH, ®); + else + ret = regmap_read(data->regmap, VEML6030_REG_ALS_WL, ®); + if (ret) { + dev_err(&data->client->dev, + "can't read als threshold value %d\n", ret); + return ret; + } + + *val = reg & 0xffff; + return IIO_VAL_INT; +} + +static int veml6030_write_thresh(struct iio_dev *indio_dev, + int val, int val2, int dir) +{ + int ret; + struct veml6030_data *data = iio_priv(indio_dev); + + if (val > 0xFFFF || val < 0 || val2) + return -EINVAL; + + if (dir == IIO_EV_DIR_RISING) { + ret = regmap_write(data->regmap, VEML6030_REG_ALS_WH, val); + if (ret) + dev_err(&data->client->dev, + "can't set high threshold %d\n", ret); + } else { + ret = regmap_write(data->regmap, VEML6030_REG_ALS_WL, val); + if (ret) + dev_err(&data->client->dev, + "can't set low threshold %d\n", ret); + } + + return ret; +} + +static int veml6030_get_total_gain(struct veml6030_data *data) +{ + int gain, it, reg, ret; + + ret = regmap_field_read(data->rf.gain, ®); + if (ret) + return ret; + + gain = iio_gts_find_gain_by_sel(&data->gts, reg); + if (gain < 0) + return gain; + + ret = regmap_field_read(data->rf.it, ®); + if (ret) + return ret; + + it = iio_gts_find_int_time_by_sel(&data->gts, reg); + if (it < 0) + return it; + + return iio_gts_get_total_gain(&data->gts, gain, it); +} + +static int veml6030_get_scale(struct veml6030_data *data, int *val, int *val2) +{ + int gain, it, reg, ret; + + ret = regmap_field_read(data->rf.gain, ®); + if (ret) + return ret; + + gain = iio_gts_find_gain_by_sel(&data->gts, reg); + if (gain < 0) + return gain; + + ret = regmap_field_read(data->rf.it, ®); + if (ret) + return ret; + + it = iio_gts_find_int_time_by_sel(&data->gts, reg); + if (it < 0) + return it; + + ret = iio_gts_get_scale(&data->gts, gain, it, val, val2); + if (ret) + return ret; + + return IIO_VAL_INT_PLUS_NANO; +} + +static int veml6030_process_als(struct veml6030_data *data, int raw, + int *val, int *val2) +{ + int total_gain; + + total_gain = veml6030_get_total_gain(data); + if (total_gain < 0) + return total_gain; + + *val = raw * data->chip->max_scale / total_gain / 10000; + *val2 = raw * data->chip->max_scale / total_gain % 10000 * 100; + + return IIO_VAL_INT_PLUS_MICRO; +} + +/* + * Provide both raw as well as light reading in lux. + * light (in lux) = resolution * raw reading + */ +static int veml6030_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, + int *val2, long mask) +{ + int ret, reg; + struct veml6030_data *data = iio_priv(indio_dev); + struct regmap *regmap = data->regmap; + struct device *dev = &data->client->dev; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + case IIO_CHAN_INFO_PROCESSED: + switch (chan->type) { + case IIO_LIGHT: + ret = regmap_read(regmap, VEML6030_REG_ALS_DATA, ®); + if (ret < 0) { + dev_err(dev, "can't read als data %d\n", ret); + return ret; + } + if (mask == IIO_CHAN_INFO_PROCESSED) + return veml6030_process_als(data, reg, val, val2); + + *val = reg; + return IIO_VAL_INT; + case IIO_INTENSITY: + ret = regmap_read(regmap, VEML6030_REG_WH_DATA, ®); + if (ret < 0) { + dev_err(dev, "can't read white data %d\n", ret); + return ret; + } + *val = reg; + return IIO_VAL_INT; + default: + return -EINVAL; + } + case IIO_CHAN_INFO_INT_TIME: + return veml6030_get_it(data, val, val2); + case IIO_CHAN_INFO_SCALE: + return veml6030_get_scale(data, val, val2); + default: + return -EINVAL; + } +} + +static int veml6030_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int **vals, int *type, int *length, + long mask) +{ + struct veml6030_data *data = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_INT_TIME: + return iio_gts_avail_times(&data->gts, vals, type, length); + case IIO_CHAN_INFO_SCALE: + return iio_gts_all_avail_scales(&data->gts, vals, type, length); + } + + return -EINVAL; +} + +static int veml6030_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + switch (mask) { + case IIO_CHAN_INFO_INT_TIME: + return veml6030_set_it(indio_dev, val, val2); + case IIO_CHAN_INFO_SCALE: + return veml6030_set_scale(indio_dev, val, val2); + default: + return -EINVAL; + } +} + +static int veml6030_write_raw_get_fmt(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + long mask) +{ + switch (mask) { + case IIO_CHAN_INFO_SCALE: + return IIO_VAL_INT_PLUS_NANO; + case IIO_CHAN_INFO_INT_TIME: + return IIO_VAL_INT_PLUS_MICRO; + default: + return -EINVAL; + } +} + +static int veml6030_read_event_val(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) +{ + switch (info) { + case IIO_EV_INFO_VALUE: + switch (dir) { + case IIO_EV_DIR_RISING: + case IIO_EV_DIR_FALLING: + return veml6030_read_thresh(indio_dev, val, val2, dir); + default: + return -EINVAL; + } + break; + case IIO_EV_INFO_PERIOD: + return veml6030_read_persistence(indio_dev, val, val2); + default: + return -EINVAL; + } +} + +static int veml6030_write_event_val(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) +{ + switch (info) { + case IIO_EV_INFO_VALUE: + return veml6030_write_thresh(indio_dev, val, val2, dir); + case IIO_EV_INFO_PERIOD: + return veml6030_write_persistence(indio_dev, val, val2); + default: + return -EINVAL; + } +} + +static int veml6030_read_interrupt_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, enum iio_event_type type, + enum iio_event_direction dir) +{ + int ret, reg; + struct veml6030_data *data = iio_priv(indio_dev); + + ret = regmap_read(data->regmap, VEML6030_REG_ALS_CONF, ®); + if (ret) { + dev_err(&data->client->dev, + "can't read als conf register %d\n", ret); + return ret; + } + + if (reg & VEML6030_ALS_INT_EN) + return 1; + else + return 0; +} + +/* + * Sensor should not be measuring light when interrupt is configured. + * Therefore correct sequence to configure interrupt functionality is: + * shut down -> enable/disable interrupt -> power on + * + * state = 1 enables interrupt, state = 0 disables interrupt + */ +static int veml6030_write_interrupt_config(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, enum iio_event_type type, + enum iio_event_direction dir, bool state) +{ + int ret; + struct veml6030_data *data = iio_priv(indio_dev); + + ret = veml6030_als_shut_down(data); + if (ret < 0) { + dev_err(&data->client->dev, + "can't disable als to configure interrupt %d\n", ret); + return ret; + } + + /* enable interrupt + power on */ + ret = regmap_update_bits(data->regmap, VEML6030_REG_ALS_CONF, + VEML6030_ALS_INT_EN | VEML6030_ALS_SD, state << 1); + if (ret) + dev_err(&data->client->dev, + "can't enable interrupt & poweron als %d\n", ret); + + return ret; +} + +static const struct iio_info veml6030_info = { + .read_raw = veml6030_read_raw, + .read_avail = veml6030_read_avail, + .write_raw = veml6030_write_raw, + .write_raw_get_fmt = veml6030_write_raw_get_fmt, + .read_event_value = veml6030_read_event_val, + .write_event_value = veml6030_write_event_val, + .read_event_config = veml6030_read_interrupt_config, + .write_event_config = veml6030_write_interrupt_config, + .event_attrs = &veml6030_event_attr_group, +}; + +static const struct iio_info veml6030_info_no_irq = { + .read_raw = veml6030_read_raw, + .read_avail = veml6030_read_avail, + .write_raw = veml6030_write_raw, + .write_raw_get_fmt = veml6030_write_raw_get_fmt, +}; + +static irqreturn_t veml6030_event_handler(int irq, void *private) +{ + int ret, reg, evtdir; + struct iio_dev *indio_dev = private; + struct veml6030_data *data = iio_priv(indio_dev); + + ret = regmap_read(data->regmap, VEML6030_REG_ALS_INT, ®); + if (ret) { + dev_err(&data->client->dev, + "can't read als interrupt register %d\n", ret); + return IRQ_HANDLED; + } + + /* Spurious interrupt handling */ + if (!(reg & (VEML6030_INT_TH_HIGH | VEML6030_INT_TH_LOW))) + return IRQ_NONE; + + if (reg & VEML6030_INT_TH_HIGH) + evtdir = IIO_EV_DIR_RISING; + else + evtdir = IIO_EV_DIR_FALLING; + + iio_push_event(indio_dev, IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, + 0, IIO_EV_TYPE_THRESH, evtdir), + iio_get_time_ns(indio_dev)); + + return IRQ_HANDLED; +} + +static irqreturn_t veml6030_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *iio = pf->indio_dev; + struct veml6030_data *data = iio_priv(iio); + unsigned int reg; + int ch, ret, i = 0; + struct { + u16 chans[2]; + aligned_s64 timestamp; + } scan = { }; + + iio_for_each_active_channel(iio, ch) { + ret = regmap_read(data->regmap, VEML6030_REG_DATA(ch), + ®); + if (ret) + goto done; + + scan.chans[i++] = reg; + } + + iio_push_to_buffers_with_ts(iio, &scan, sizeof(scan), pf->timestamp); + +done: + iio_trigger_notify_done(iio->trig); + + return IRQ_HANDLED; +} + +static int veml6030_set_info(struct iio_dev *indio_dev) +{ + struct veml6030_data *data = iio_priv(indio_dev); + struct i2c_client *client = data->client; + int ret; + + if (client->irq) { + ret = devm_request_threaded_irq(&client->dev, client->irq, + NULL, veml6030_event_handler, + IRQF_TRIGGER_LOW | IRQF_ONESHOT, + indio_dev->name, indio_dev); + if (ret < 0) + return dev_err_probe(&client->dev, ret, + "irq %d request failed\n", + client->irq); + + indio_dev->info = &veml6030_info; + } else { + indio_dev->info = &veml6030_info_no_irq; + } + + return 0; +} + +static int veml7700_set_info(struct iio_dev *indio_dev) +{ + indio_dev->info = &veml6030_info_no_irq; + + return 0; +} + +static int veml6030_regfield_init(struct iio_dev *indio_dev) +{ + struct veml6030_data *data = iio_priv(indio_dev); + struct regmap *regmap = data->regmap; + struct device *dev = &data->client->dev; + struct regmap_field *rm_field; + struct veml6030_rf *rf = &data->rf; + + rm_field = devm_regmap_field_alloc(dev, regmap, data->chip->it_rf); + if (IS_ERR(rm_field)) + return PTR_ERR(rm_field); + rf->it = rm_field; + + rm_field = devm_regmap_field_alloc(dev, regmap, data->chip->gain_rf); + if (IS_ERR(rm_field)) + return PTR_ERR(rm_field); + rf->gain = rm_field; + + return 0; +} + +/* + * Set ALS gain to 1/8, integration time to 100 ms, PSM to mode 2, + * persistence to 1 x integration time and the threshold + * interrupt disabled by default. First shutdown the sensor, + * update registers and then power on the sensor. + */ +static int veml6030_hw_init(struct iio_dev *indio_dev, struct device *dev) +{ + int ret, val; + struct veml6030_data *data = iio_priv(indio_dev); + + ret = devm_iio_init_iio_gts(dev, 2, 150400000, + veml6030_gain_sel, ARRAY_SIZE(veml6030_gain_sel), + veml6030_it_sel, ARRAY_SIZE(veml6030_it_sel), + &data->gts); + if (ret) + return dev_err_probe(dev, ret, "failed to init iio gts\n"); + + ret = veml6030_als_shut_down(data); + if (ret) + return dev_err_probe(dev, ret, "can't shutdown als\n"); + + ret = regmap_write(data->regmap, VEML6030_REG_ALS_CONF, 0x1001); + if (ret) + return dev_err_probe(dev, ret, "can't setup als configs\n"); + + ret = regmap_update_bits(data->regmap, VEML6030_REG_ALS_PSM, + VEML6030_PSM | VEML6030_PSM_EN, 0x03); + if (ret) + return dev_err_probe(dev, ret, "can't setup default PSM\n"); + + ret = regmap_write(data->regmap, VEML6030_REG_ALS_WH, 0xFFFF); + if (ret) + return dev_err_probe(dev, ret, "can't setup high threshold\n"); + + ret = regmap_write(data->regmap, VEML6030_REG_ALS_WL, 0x0000); + if (ret) + return dev_err_probe(dev, ret, "can't setup low threshold\n"); + + ret = veml6030_als_pwr_on(data); + if (ret) + return dev_err_probe(dev, ret, "can't poweron als\n"); + + ret = devm_add_action_or_reset(dev, veml6030_als_shut_down_action, data); + if (ret < 0) + return ret; + + /* Clear stale interrupt status bits if any during start */ + ret = regmap_read(data->regmap, VEML6030_REG_ALS_INT, &val); + if (ret < 0) + return dev_err_probe(dev, ret, + "can't clear als interrupt status\n"); + + return ret; +} + +/* + * Set ALS gain to 1/8, integration time to 100 ms, ALS and WHITE + * channel enabled, ALS channel interrupt, PSM enabled, + * PSM_WAIT = 0.8 s, persistence to 1 x integration time and the + * threshold interrupt disabled by default. First shutdown the sensor, + * update registers and then power on the sensor. + */ +static int veml6035_hw_init(struct iio_dev *indio_dev, struct device *dev) +{ + int ret, val; + struct veml6030_data *data = iio_priv(indio_dev); + + ret = devm_iio_init_iio_gts(dev, 0, 409600000, + veml6035_gain_sel, ARRAY_SIZE(veml6035_gain_sel), + veml6030_it_sel, ARRAY_SIZE(veml6030_it_sel), + &data->gts); + if (ret) + return dev_err_probe(dev, ret, "failed to init iio gts\n"); + + ret = veml6030_als_shut_down(data); + if (ret) + return dev_err_probe(dev, ret, "can't shutdown als\n"); + + ret = regmap_write(data->regmap, VEML6030_REG_ALS_CONF, + VEML6035_SENS | VEML6035_CHAN_EN | VEML6030_ALS_SD); + if (ret) + return dev_err_probe(dev, ret, "can't setup als configs\n"); + + ret = regmap_update_bits(data->regmap, VEML6030_REG_ALS_PSM, + VEML6030_PSM | VEML6030_PSM_EN, 0x03); + if (ret) + return dev_err_probe(dev, ret, "can't setup default PSM\n"); + + ret = regmap_write(data->regmap, VEML6030_REG_ALS_WH, 0xFFFF); + if (ret) + return dev_err_probe(dev, ret, "can't setup high threshold\n"); + + ret = regmap_write(data->regmap, VEML6030_REG_ALS_WL, 0x0000); + if (ret) + return dev_err_probe(dev, ret, "can't setup low threshold\n"); + + ret = veml6030_als_pwr_on(data); + if (ret) + return dev_err_probe(dev, ret, "can't poweron als\n"); + + ret = devm_add_action_or_reset(dev, veml6030_als_shut_down_action, data); + if (ret < 0) + return ret; + + /* Clear stale interrupt status bits if any during start */ + ret = regmap_read(data->regmap, VEML6030_REG_ALS_INT, &val); + if (ret < 0) + return dev_err_probe(dev, ret, + "can't clear als interrupt status\n"); + + return 0; +} + +static int veml6030_probe(struct i2c_client *client) +{ + int ret; + struct veml6030_data *data; + struct iio_dev *indio_dev; + struct regmap *regmap; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) + return dev_err_probe(&client->dev, -EOPNOTSUPP, + "i2c adapter doesn't support plain i2c\n"); + + regmap = devm_regmap_init_i2c(client, &veml6030_regmap_config); + if (IS_ERR(regmap)) + return dev_err_probe(&client->dev, PTR_ERR(regmap), + "can't setup regmap\n"); + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + data = iio_priv(indio_dev); + i2c_set_clientdata(client, indio_dev); + data->client = client; + data->regmap = regmap; + + ret = devm_regulator_get_enable(&client->dev, "vdd"); + if (ret) + return dev_err_probe(&client->dev, ret, + "failed to enable regulator\n"); + + data->chip = i2c_get_match_data(client); + if (!data->chip) + return -EINVAL; + + indio_dev->name = data->chip->name; + indio_dev->channels = data->chip->channels; + indio_dev->num_channels = data->chip->num_channels; + indio_dev->modes = INDIO_DIRECT_MODE; + + ret = data->chip->set_info(indio_dev); + if (ret < 0) + return ret; + + ret = veml6030_regfield_init(indio_dev); + if (ret) + return dev_err_probe(&client->dev, ret, + "failed to init regfields\n"); + + ret = data->chip->hw_init(indio_dev, &client->dev); + if (ret < 0) + return ret; + + ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL, + veml6030_trigger_handler, NULL); + if (ret) + return dev_err_probe(&client->dev, ret, + "Failed to register triggered buffer"); + + return devm_iio_device_register(&client->dev, indio_dev); +} + +static int veml6030_runtime_suspend(struct device *dev) +{ + int ret; + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + struct veml6030_data *data = iio_priv(indio_dev); + + ret = veml6030_als_shut_down(data); + if (ret < 0) + dev_err(&data->client->dev, "can't suspend als %d\n", ret); + + return ret; +} + +static int veml6030_runtime_resume(struct device *dev) +{ + int ret; + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + struct veml6030_data *data = iio_priv(indio_dev); + + ret = veml6030_als_pwr_on(data); + if (ret < 0) + dev_err(&data->client->dev, "can't resume als %d\n", ret); + + return ret; +} + +static DEFINE_RUNTIME_DEV_PM_OPS(veml6030_pm_ops, veml6030_runtime_suspend, + veml6030_runtime_resume, NULL); + +static const struct veml603x_chip veml6030_chip = { + .name = "veml6030", + .channels = veml6030_channels, + .num_channels = ARRAY_SIZE(veml6030_channels), + .gain_rf = VEML6030_GAIN_RF, + .it_rf = VEML6030_IT_RF, + .max_scale = VEML6030_MAX_SCALE, + .hw_init = veml6030_hw_init, + .set_info = veml6030_set_info, +}; + +static const struct veml603x_chip veml6035_chip = { + .name = "veml6035", + .channels = veml6030_channels, + .num_channels = ARRAY_SIZE(veml6030_channels), + .gain_rf = VEML6035_GAIN_RF, + .it_rf = VEML6030_IT_RF, + .max_scale = VEML6035_MAX_SCALE, + .hw_init = veml6035_hw_init, + .set_info = veml6030_set_info, +}; + +static const struct veml603x_chip veml7700_chip = { + .name = "veml7700", + .channels = veml7700_channels, + .num_channels = ARRAY_SIZE(veml7700_channels), + .gain_rf = VEML6030_GAIN_RF, + .it_rf = VEML6030_IT_RF, + .max_scale = VEML6030_MAX_SCALE, + .hw_init = veml6030_hw_init, + .set_info = veml7700_set_info, +}; + +static const struct of_device_id veml6030_of_match[] = { + { + .compatible = "vishay,veml6030", + .data = &veml6030_chip, + }, + { + .compatible = "vishay,veml6035", + .data = &veml6035_chip, + }, + { + .compatible = "vishay,veml7700", + .data = &veml7700_chip, + }, + { } +}; +MODULE_DEVICE_TABLE(of, veml6030_of_match); + +static const struct i2c_device_id veml6030_id[] = { + { "veml6030", (kernel_ulong_t)&veml6030_chip}, + { "veml6035", (kernel_ulong_t)&veml6035_chip}, + { "veml7700", (kernel_ulong_t)&veml7700_chip}, + { } +}; +MODULE_DEVICE_TABLE(i2c, veml6030_id); + +static struct i2c_driver veml6030_driver = { + .driver = { + .name = "veml6030", + .of_match_table = veml6030_of_match, + .pm = pm_ptr(&veml6030_pm_ops), + }, + .probe = veml6030_probe, + .id_table = veml6030_id, +}; +module_i2c_driver(veml6030_driver); + +MODULE_AUTHOR("Rishi Gupta <gupt21@gmail.com>"); +MODULE_DESCRIPTION("VEML6030 Ambient Light Sensor"); +MODULE_LICENSE("GPL v2"); +MODULE_IMPORT_NS("IIO_GTS_HELPER"); |