909 lines
22 KiB
C
909 lines
22 KiB
C
![]() |
// SPDX-License-Identifier: GPL-2.0+
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/*
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* VEML6030 Ambient Light Sensor
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*
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* Copyright (c) 2019, Rishi Gupta <gupt21@gmail.com>
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*
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* Datasheet: https://www.vishay.com/docs/84366/veml6030.pdf
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* Appnote-84367: https://www.vishay.com/docs/84367/designingveml6030.pdf
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/err.h>
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#include <linux/regmap.h>
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#include <linux/interrupt.h>
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#include <linux/pm_runtime.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/events.h>
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/* Device registers */
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#define VEML6030_REG_ALS_CONF 0x00
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#define VEML6030_REG_ALS_WH 0x01
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#define VEML6030_REG_ALS_WL 0x02
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#define VEML6030_REG_ALS_PSM 0x03
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#define VEML6030_REG_ALS_DATA 0x04
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#define VEML6030_REG_WH_DATA 0x05
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#define VEML6030_REG_ALS_INT 0x06
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/* Bit masks for specific functionality */
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#define VEML6030_ALS_IT GENMASK(9, 6)
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#define VEML6030_PSM GENMASK(2, 1)
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#define VEML6030_ALS_PERS GENMASK(5, 4)
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#define VEML6030_ALS_GAIN GENMASK(12, 11)
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#define VEML6030_PSM_EN BIT(0)
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#define VEML6030_INT_TH_LOW BIT(15)
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#define VEML6030_INT_TH_HIGH BIT(14)
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#define VEML6030_ALS_INT_EN BIT(1)
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#define VEML6030_ALS_SD BIT(0)
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/*
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* The resolution depends on both gain and integration time. The
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* cur_resolution stores one of the resolution mentioned in the
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* table during startup and gets updated whenever integration time
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* or gain is changed.
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*
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* Table 'resolution and maximum detection range' in appnote 84367
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* is visualized as a 2D array. The cur_gain stores index of gain
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* in this table (0-3) while the cur_integration_time holds index
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* of integration time (0-5).
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*/
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struct veml6030_data {
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struct i2c_client *client;
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struct regmap *regmap;
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int cur_resolution;
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int cur_gain;
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int cur_integration_time;
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};
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/* Integration time available in seconds */
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static IIO_CONST_ATTR(in_illuminance_integration_time_available,
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"0.025 0.05 0.1 0.2 0.4 0.8");
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/*
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* Scale is 1/gain. Value 0.125 is ALS gain x (1/8), 0.25 is
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* ALS gain x (1/4), 1.0 = ALS gain x 1 and 2.0 is ALS gain x 2.
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*/
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static IIO_CONST_ATTR(in_illuminance_scale_available,
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"0.125 0.25 1.0 2.0");
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static struct attribute *veml6030_attributes[] = {
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&iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
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&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
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NULL
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};
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static const struct attribute_group veml6030_attr_group = {
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.attrs = veml6030_attributes,
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};
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/*
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* Persistence = 1/2/4/8 x integration time
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* Minimum time for which light readings must stay above configured
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* threshold to assert the interrupt.
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*/
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static const char * const period_values[] = {
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"0.1 0.2 0.4 0.8",
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"0.2 0.4 0.8 1.6",
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"0.4 0.8 1.6 3.2",
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"0.8 1.6 3.2 6.4",
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"0.05 0.1 0.2 0.4",
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"0.025 0.050 0.1 0.2"
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};
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/*
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* Return list of valid period values in seconds corresponding to
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* the currently active integration time.
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*/
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static ssize_t in_illuminance_period_available_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int ret, reg, x;
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struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
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struct veml6030_data *data = iio_priv(indio_dev);
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ret = regmap_read(data->regmap, VEML6030_REG_ALS_CONF, ®);
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if (ret) {
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dev_err(&data->client->dev,
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"can't read als conf register %d\n", ret);
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return ret;
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}
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ret = ((reg >> 6) & 0xF);
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switch (ret) {
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case 0:
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case 1:
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case 2:
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case 3:
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x = ret;
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break;
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case 8:
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x = 4;
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break;
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case 12:
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x = 5;
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break;
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default:
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return -EINVAL;
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}
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return snprintf(buf, PAGE_SIZE, "%s\n", period_values[x]);
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}
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static IIO_DEVICE_ATTR_RO(in_illuminance_period_available, 0);
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static struct attribute *veml6030_event_attributes[] = {
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&iio_dev_attr_in_illuminance_period_available.dev_attr.attr,
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NULL
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};
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static const struct attribute_group veml6030_event_attr_group = {
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.attrs = veml6030_event_attributes,
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};
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static int veml6030_als_pwr_on(struct veml6030_data *data)
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{
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return regmap_update_bits(data->regmap, VEML6030_REG_ALS_CONF,
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VEML6030_ALS_SD, 0);
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}
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static int veml6030_als_shut_down(struct veml6030_data *data)
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{
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return regmap_update_bits(data->regmap, VEML6030_REG_ALS_CONF,
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VEML6030_ALS_SD, 1);
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}
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static void veml6030_als_shut_down_action(void *data)
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{
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veml6030_als_shut_down(data);
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}
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static const struct iio_event_spec veml6030_event_spec[] = {
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{
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_RISING,
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.mask_separate = BIT(IIO_EV_INFO_VALUE),
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}, {
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_FALLING,
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.mask_separate = BIT(IIO_EV_INFO_VALUE),
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}, {
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_EITHER,
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.mask_separate = BIT(IIO_EV_INFO_PERIOD) |
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BIT(IIO_EV_INFO_ENABLE),
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},
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};
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/* Channel number */
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enum veml6030_chan {
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CH_ALS,
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CH_WHITE,
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};
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static const struct iio_chan_spec veml6030_channels[] = {
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{
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.type = IIO_LIGHT,
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.channel = CH_ALS,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_PROCESSED) |
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BIT(IIO_CHAN_INFO_INT_TIME) |
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BIT(IIO_CHAN_INFO_SCALE),
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.event_spec = veml6030_event_spec,
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.num_event_specs = ARRAY_SIZE(veml6030_event_spec),
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},
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{
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.type = IIO_INTENSITY,
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.channel = CH_WHITE,
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.modified = 1,
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.channel2 = IIO_MOD_LIGHT_BOTH,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_PROCESSED),
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},
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};
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static const struct regmap_config veml6030_regmap_config = {
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.name = "veml6030_regmap",
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.reg_bits = 8,
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.val_bits = 16,
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.max_register = VEML6030_REG_ALS_INT,
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.val_format_endian = REGMAP_ENDIAN_LITTLE,
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};
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static int veml6030_get_intgrn_tm(struct iio_dev *indio_dev,
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int *val, int *val2)
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{
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int ret, reg;
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struct veml6030_data *data = iio_priv(indio_dev);
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ret = regmap_read(data->regmap, VEML6030_REG_ALS_CONF, ®);
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if (ret) {
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dev_err(&data->client->dev,
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"can't read als conf register %d\n", ret);
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return ret;
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}
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switch ((reg >> 6) & 0xF) {
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case 0:
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*val2 = 100000;
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break;
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case 1:
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*val2 = 200000;
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break;
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case 2:
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*val2 = 400000;
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break;
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case 3:
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*val2 = 800000;
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break;
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case 8:
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*val2 = 50000;
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break;
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case 12:
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*val2 = 25000;
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break;
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default:
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return -EINVAL;
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}
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*val = 0;
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return IIO_VAL_INT_PLUS_MICRO;
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}
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static int veml6030_set_intgrn_tm(struct iio_dev *indio_dev,
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int val, int val2)
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{
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int ret, new_int_time, int_idx;
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struct veml6030_data *data = iio_priv(indio_dev);
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if (val)
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return -EINVAL;
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switch (val2) {
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case 25000:
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new_int_time = 0x300;
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int_idx = 5;
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break;
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case 50000:
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new_int_time = 0x200;
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int_idx = 4;
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break;
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case 100000:
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new_int_time = 0x00;
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int_idx = 3;
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break;
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case 200000:
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new_int_time = 0x40;
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int_idx = 2;
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break;
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case 400000:
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new_int_time = 0x80;
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int_idx = 1;
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break;
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case 800000:
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new_int_time = 0xC0;
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int_idx = 0;
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break;
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default:
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return -EINVAL;
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}
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ret = regmap_update_bits(data->regmap, VEML6030_REG_ALS_CONF,
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VEML6030_ALS_IT, new_int_time);
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if (ret) {
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dev_err(&data->client->dev,
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"can't update als integration time %d\n", ret);
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return ret;
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}
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/*
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* Cache current integration time and update resolution. For every
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* increase in integration time to next level, resolution is halved
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* and vice-versa.
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*/
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if (data->cur_integration_time < int_idx)
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data->cur_resolution <<= int_idx - data->cur_integration_time;
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else if (data->cur_integration_time > int_idx)
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data->cur_resolution >>= data->cur_integration_time - int_idx;
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data->cur_integration_time = int_idx;
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return ret;
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}
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static int veml6030_read_persistence(struct iio_dev *indio_dev,
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int *val, int *val2)
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{
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int ret, reg, period, x, y;
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struct veml6030_data *data = iio_priv(indio_dev);
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ret = veml6030_get_intgrn_tm(indio_dev, &x, &y);
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if (ret < 0)
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return ret;
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ret = regmap_read(data->regmap, VEML6030_REG_ALS_CONF, ®);
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if (ret) {
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dev_err(&data->client->dev,
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"can't read als conf register %d\n", ret);
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}
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/* integration time multiplied by 1/2/4/8 */
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period = y * (1 << ((reg >> 4) & 0x03));
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*val = period / 1000000;
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*val2 = period % 1000000;
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return IIO_VAL_INT_PLUS_MICRO;
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}
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static int veml6030_write_persistence(struct iio_dev *indio_dev,
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int val, int val2)
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{
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int ret, period, x, y;
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struct veml6030_data *data = iio_priv(indio_dev);
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ret = veml6030_get_intgrn_tm(indio_dev, &x, &y);
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if (ret < 0)
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return ret;
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if (!val) {
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period = val2 / y;
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} else {
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if ((val == 1) && (val2 == 600000))
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period = 1600000 / y;
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else if ((val == 3) && (val2 == 200000))
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period = 3200000 / y;
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else if ((val == 6) && (val2 == 400000))
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period = 6400000 / y;
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else
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period = -1;
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}
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if (period <= 0 || period > 8 || hweight8(period) != 1)
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return -EINVAL;
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ret = regmap_update_bits(data->regmap, VEML6030_REG_ALS_CONF,
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VEML6030_ALS_PERS, (ffs(period) - 1) << 4);
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if (ret)
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dev_err(&data->client->dev,
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"can't set persistence value %d\n", ret);
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return ret;
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}
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static int veml6030_set_als_gain(struct iio_dev *indio_dev,
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int val, int val2)
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{
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int ret, new_gain, gain_idx;
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struct veml6030_data *data = iio_priv(indio_dev);
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if (val == 0 && val2 == 125000) {
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new_gain = 0x1000; /* 0x02 << 11 */
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gain_idx = 3;
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} else if (val == 0 && val2 == 250000) {
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new_gain = 0x1800;
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gain_idx = 2;
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} else if (val == 1 && val2 == 0) {
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new_gain = 0x00;
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gain_idx = 1;
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} else if (val == 2 && val2 == 0) {
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new_gain = 0x800;
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gain_idx = 0;
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} else {
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return -EINVAL;
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}
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ret = regmap_update_bits(data->regmap, VEML6030_REG_ALS_CONF,
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VEML6030_ALS_GAIN, new_gain);
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if (ret) {
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dev_err(&data->client->dev,
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"can't set als gain %d\n", ret);
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return ret;
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}
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/*
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* Cache currently set gain & update resolution. For every
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* increase in the gain to next level, resolution is halved
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* and vice-versa.
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*/
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if (data->cur_gain < gain_idx)
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data->cur_resolution <<= gain_idx - data->cur_gain;
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else if (data->cur_gain > gain_idx)
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data->cur_resolution >>= data->cur_gain - gain_idx;
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data->cur_gain = gain_idx;
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return ret;
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}
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static int veml6030_get_als_gain(struct iio_dev *indio_dev,
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int *val, int *val2)
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{
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int ret, reg;
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struct veml6030_data *data = iio_priv(indio_dev);
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ret = regmap_read(data->regmap, VEML6030_REG_ALS_CONF, ®);
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if (ret) {
|
||
|
dev_err(&data->client->dev,
|
||
|
"can't read als conf register %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
switch ((reg >> 11) & 0x03) {
|
||
|
case 0:
|
||
|
*val = 1;
|
||
|
*val2 = 0;
|
||
|
break;
|
||
|
case 1:
|
||
|
*val = 2;
|
||
|
*val2 = 0;
|
||
|
break;
|
||
|
case 2:
|
||
|
*val = 0;
|
||
|
*val2 = 125000;
|
||
|
break;
|
||
|
case 3:
|
||
|
*val = 0;
|
||
|
*val2 = 250000;
|
||
|
break;
|
||
|
default:
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
return IIO_VAL_INT_PLUS_MICRO;
|
||
|
}
|
||
|
|
||
|
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;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* 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) {
|
||
|
*val = (reg * data->cur_resolution) / 10000;
|
||
|
*val2 = (reg * data->cur_resolution) % 10000;
|
||
|
return IIO_VAL_INT_PLUS_MICRO;
|
||
|
}
|
||
|
*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;
|
||
|
}
|
||
|
if (mask == IIO_CHAN_INFO_PROCESSED) {
|
||
|
*val = (reg * data->cur_resolution) / 10000;
|
||
|
*val2 = (reg * data->cur_resolution) % 10000;
|
||
|
return IIO_VAL_INT_PLUS_MICRO;
|
||
|
}
|
||
|
*val = reg;
|
||
|
return IIO_VAL_INT;
|
||
|
default:
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
case IIO_CHAN_INFO_INT_TIME:
|
||
|
if (chan->type == IIO_LIGHT)
|
||
|
return veml6030_get_intgrn_tm(indio_dev, val, val2);
|
||
|
return -EINVAL;
|
||
|
case IIO_CHAN_INFO_SCALE:
|
||
|
if (chan->type == IIO_LIGHT)
|
||
|
return veml6030_get_als_gain(indio_dev, val, val2);
|
||
|
return -EINVAL;
|
||
|
default:
|
||
|
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:
|
||
|
switch (chan->type) {
|
||
|
case IIO_LIGHT:
|
||
|
return veml6030_set_intgrn_tm(indio_dev, val, val2);
|
||
|
default:
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
case IIO_CHAN_INFO_SCALE:
|
||
|
switch (chan->type) {
|
||
|
case IIO_LIGHT:
|
||
|
return veml6030_set_als_gain(indio_dev, val, val2);
|
||
|
default:
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
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, int state)
|
||
|
{
|
||
|
int ret;
|
||
|
struct veml6030_data *data = iio_priv(indio_dev);
|
||
|
|
||
|
if (state < 0 || state > 1)
|
||
|
return -EINVAL;
|
||
|
|
||
|
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,
|
||
|
.write_raw = veml6030_write_raw,
|
||
|
.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,
|
||
|
.attrs = &veml6030_attr_group,
|
||
|
.event_attrs = &veml6030_event_attr_group,
|
||
|
};
|
||
|
|
||
|
static const struct iio_info veml6030_info_no_irq = {
|
||
|
.read_raw = veml6030_read_raw,
|
||
|
.write_raw = veml6030_write_raw,
|
||
|
.attrs = &veml6030_attr_group,
|
||
|
};
|
||
|
|
||
|
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;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* 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)
|
||
|
{
|
||
|
int ret, val;
|
||
|
struct veml6030_data *data = iio_priv(indio_dev);
|
||
|
struct i2c_client *client = data->client;
|
||
|
|
||
|
ret = veml6030_als_shut_down(data);
|
||
|
if (ret) {
|
||
|
dev_err(&client->dev, "can't shutdown als %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
ret = regmap_write(data->regmap, VEML6030_REG_ALS_CONF, 0x1001);
|
||
|
if (ret) {
|
||
|
dev_err(&client->dev, "can't setup als configs %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
ret = regmap_update_bits(data->regmap, VEML6030_REG_ALS_PSM,
|
||
|
VEML6030_PSM | VEML6030_PSM_EN, 0x03);
|
||
|
if (ret) {
|
||
|
dev_err(&client->dev, "can't setup default PSM %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
ret = regmap_write(data->regmap, VEML6030_REG_ALS_WH, 0xFFFF);
|
||
|
if (ret) {
|
||
|
dev_err(&client->dev, "can't setup high threshold %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
ret = regmap_write(data->regmap, VEML6030_REG_ALS_WL, 0x0000);
|
||
|
if (ret) {
|
||
|
dev_err(&client->dev, "can't setup low threshold %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
ret = veml6030_als_pwr_on(data);
|
||
|
if (ret) {
|
||
|
dev_err(&client->dev, "can't poweron als %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/* Wait 4 ms to let processor & oscillator start correctly */
|
||
|
usleep_range(4000, 4002);
|
||
|
|
||
|
/* Clear stale interrupt status bits if any during start */
|
||
|
ret = regmap_read(data->regmap, VEML6030_REG_ALS_INT, &val);
|
||
|
if (ret < 0) {
|
||
|
dev_err(&client->dev,
|
||
|
"can't clear als interrupt status %d\n", ret);
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
/* Cache currently active measurement parameters */
|
||
|
data->cur_gain = 3;
|
||
|
data->cur_resolution = 4608;
|
||
|
data->cur_integration_time = 3;
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int veml6030_probe(struct i2c_client *client,
|
||
|
const struct i2c_device_id *id)
|
||
|
{
|
||
|
int ret;
|
||
|
struct veml6030_data *data;
|
||
|
struct iio_dev *indio_dev;
|
||
|
struct regmap *regmap;
|
||
|
|
||
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
|
||
|
dev_err(&client->dev, "i2c adapter doesn't support plain i2c\n");
|
||
|
return -EOPNOTSUPP;
|
||
|
}
|
||
|
|
||
|
regmap = devm_regmap_init_i2c(client, &veml6030_regmap_config);
|
||
|
if (IS_ERR(regmap)) {
|
||
|
dev_err(&client->dev, "can't setup regmap\n");
|
||
|
return PTR_ERR(regmap);
|
||
|
}
|
||
|
|
||
|
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;
|
||
|
|
||
|
indio_dev->dev.parent = &client->dev;
|
||
|
indio_dev->name = "veml6030";
|
||
|
indio_dev->channels = veml6030_channels;
|
||
|
indio_dev->num_channels = ARRAY_SIZE(veml6030_channels);
|
||
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
||
|
|
||
|
if (client->irq) {
|
||
|
ret = devm_request_threaded_irq(&client->dev, client->irq,
|
||
|
NULL, veml6030_event_handler,
|
||
|
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
|
||
|
"veml6030", indio_dev);
|
||
|
if (ret < 0) {
|
||
|
dev_err(&client->dev,
|
||
|
"irq %d request failed\n", client->irq);
|
||
|
return ret;
|
||
|
}
|
||
|
indio_dev->info = &veml6030_info;
|
||
|
} else {
|
||
|
indio_dev->info = &veml6030_info_no_irq;
|
||
|
}
|
||
|
|
||
|
ret = veml6030_hw_init(indio_dev);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
ret = devm_add_action_or_reset(&client->dev,
|
||
|
veml6030_als_shut_down_action, data);
|
||
|
if (ret < 0)
|
||
|
return ret;
|
||
|
|
||
|
return devm_iio_device_register(&client->dev, indio_dev);
|
||
|
}
|
||
|
|
||
|
static int __maybe_unused 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 __maybe_unused 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 const struct dev_pm_ops veml6030_pm_ops = {
|
||
|
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
|
||
|
pm_runtime_force_resume)
|
||
|
SET_RUNTIME_PM_OPS(veml6030_runtime_suspend,
|
||
|
veml6030_runtime_resume, NULL)
|
||
|
};
|
||
|
|
||
|
static const struct of_device_id veml6030_of_match[] = {
|
||
|
{ .compatible = "vishay,veml6030" },
|
||
|
{ }
|
||
|
};
|
||
|
MODULE_DEVICE_TABLE(of, veml6030_of_match);
|
||
|
|
||
|
static const struct i2c_device_id veml6030_id[] = {
|
||
|
{ "veml6030", 0 },
|
||
|
{ }
|
||
|
};
|
||
|
MODULE_DEVICE_TABLE(i2c, veml6030_id);
|
||
|
|
||
|
static struct i2c_driver veml6030_driver = {
|
||
|
.driver = {
|
||
|
.name = "veml6030",
|
||
|
.of_match_table = veml6030_of_match,
|
||
|
.pm = &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");
|