diff options
Diffstat (limited to 'drivers/iio/light/vcnl4035.c')
| -rw-r--r-- | drivers/iio/light/vcnl4035.c | 679 |
1 files changed, 679 insertions, 0 deletions
diff --git a/drivers/iio/light/vcnl4035.c b/drivers/iio/light/vcnl4035.c new file mode 100644 index 000000000..6e38a33f5 --- /dev/null +++ b/drivers/iio/light/vcnl4035.c @@ -0,0 +1,679 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * VCNL4035 Ambient Light and Proximity Sensor - 7-bit I2C slave address 0x60 + * + * Copyright (c) 2018, DENX Software Engineering GmbH + * Author: Parthiban Nallathambi <pn@denx.de> + * + * TODO: Proximity + */ +#include <linux/bitops.h> +#include <linux/bitfield.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/pm_runtime.h> +#include <linux/regmap.h> + +#include <linux/iio/buffer.h> +#include <linux/iio/events.h> +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/trigger.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/triggered_buffer.h> + +#define VCNL4035_DRV_NAME "vcnl4035" +#define VCNL4035_IRQ_NAME "vcnl4035_event" +#define VCNL4035_REGMAP_NAME "vcnl4035_regmap" + +/* Device registers */ +#define VCNL4035_ALS_CONF 0x00 +#define VCNL4035_ALS_THDH 0x01 +#define VCNL4035_ALS_THDL 0x02 +#define VCNL4035_ALS_DATA 0x0B +#define VCNL4035_WHITE_DATA 0x0C +#define VCNL4035_INT_FLAG 0x0D +#define VCNL4035_DEV_ID 0x0E + +/* Register masks */ +#define VCNL4035_MODE_ALS_MASK BIT(0) +#define VCNL4035_MODE_ALS_WHITE_CHAN BIT(8) +#define VCNL4035_MODE_ALS_INT_MASK BIT(1) +#define VCNL4035_ALS_IT_MASK GENMASK(7, 5) +#define VCNL4035_ALS_PERS_MASK GENMASK(3, 2) +#define VCNL4035_INT_ALS_IF_H_MASK BIT(12) +#define VCNL4035_INT_ALS_IF_L_MASK BIT(13) +#define VCNL4035_DEV_ID_MASK GENMASK(7, 0) + +/* Default values */ +#define VCNL4035_MODE_ALS_ENABLE BIT(0) +#define VCNL4035_MODE_ALS_DISABLE 0x00 +#define VCNL4035_MODE_ALS_INT_ENABLE BIT(1) +#define VCNL4035_MODE_ALS_INT_DISABLE 0 +#define VCNL4035_DEV_ID_VAL 0x80 +#define VCNL4035_ALS_IT_DEFAULT 0x01 +#define VCNL4035_ALS_PERS_DEFAULT 0x00 +#define VCNL4035_ALS_THDH_DEFAULT 5000 +#define VCNL4035_ALS_THDL_DEFAULT 100 +#define VCNL4035_SLEEP_DELAY_MS 2000 + +struct vcnl4035_data { + struct i2c_client *client; + struct regmap *regmap; + unsigned int als_it_val; + unsigned int als_persistence; + unsigned int als_thresh_low; + unsigned int als_thresh_high; + struct iio_trigger *drdy_trigger0; +}; + +static inline bool vcnl4035_is_triggered(struct vcnl4035_data *data) +{ + int ret; + int reg; + + ret = regmap_read(data->regmap, VCNL4035_INT_FLAG, ®); + if (ret < 0) + return false; + + return !!(reg & + (VCNL4035_INT_ALS_IF_H_MASK | VCNL4035_INT_ALS_IF_L_MASK)); +} + +static irqreturn_t vcnl4035_drdy_irq_thread(int irq, void *private) +{ + struct iio_dev *indio_dev = private; + struct vcnl4035_data *data = iio_priv(indio_dev); + + if (vcnl4035_is_triggered(data)) { + iio_push_event(indio_dev, IIO_UNMOD_EVENT_CODE(IIO_LIGHT, + 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_EITHER), + iio_get_time_ns(indio_dev)); + iio_trigger_poll_chained(data->drdy_trigger0); + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +/* Triggered buffer */ +static irqreturn_t vcnl4035_trigger_consumer_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct vcnl4035_data *data = iio_priv(indio_dev); + /* Ensure naturally aligned timestamp */ + u8 buffer[ALIGN(sizeof(u16), sizeof(s64)) + sizeof(s64)] __aligned(8); + int ret; + + ret = regmap_read(data->regmap, VCNL4035_ALS_DATA, (int *)buffer); + if (ret < 0) { + dev_err(&data->client->dev, + "Trigger consumer can't read from sensor.\n"); + goto fail_read; + } + iio_push_to_buffers_with_timestamp(indio_dev, buffer, + iio_get_time_ns(indio_dev)); + +fail_read: + iio_trigger_notify_done(indio_dev->trig); + + return IRQ_HANDLED; +} + +static int vcnl4035_als_drdy_set_state(struct iio_trigger *trigger, + bool enable_drdy) +{ + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trigger); + struct vcnl4035_data *data = iio_priv(indio_dev); + int val = enable_drdy ? VCNL4035_MODE_ALS_INT_ENABLE : + VCNL4035_MODE_ALS_INT_DISABLE; + + return regmap_update_bits(data->regmap, VCNL4035_ALS_CONF, + VCNL4035_MODE_ALS_INT_MASK, + val); +} + +static const struct iio_trigger_ops vcnl4035_trigger_ops = { + .validate_device = iio_trigger_validate_own_device, + .set_trigger_state = vcnl4035_als_drdy_set_state, +}; + +static int vcnl4035_set_pm_runtime_state(struct vcnl4035_data *data, bool on) +{ + int ret; + struct device *dev = &data->client->dev; + + if (on) { + ret = pm_runtime_get_sync(dev); + if (ret < 0) + pm_runtime_put_noidle(dev); + } else { + pm_runtime_mark_last_busy(dev); + ret = pm_runtime_put_autosuspend(dev); + } + + return ret; +} + +/* + * Device IT INT Time (ms) Scale (lux/step) + * 000 50 0.064 + * 001 100 0.032 + * 010 200 0.016 + * 100 400 0.008 + * 101 - 111 800 0.004 + * Values are proportional, so ALS INT is selected for input due to + * simplicity reason. Integration time value and scaling is + * calculated based on device INT value + * + * Raw value needs to be scaled using ALS steps + */ +static int vcnl4035_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, + int *val2, long mask) +{ + struct vcnl4035_data *data = iio_priv(indio_dev); + int ret; + int raw_data; + unsigned int reg; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = vcnl4035_set_pm_runtime_state(data, true); + if (ret < 0) + return ret; + + ret = iio_device_claim_direct_mode(indio_dev); + if (!ret) { + if (chan->channel) + reg = VCNL4035_ALS_DATA; + else + reg = VCNL4035_WHITE_DATA; + ret = regmap_read(data->regmap, reg, &raw_data); + iio_device_release_direct_mode(indio_dev); + if (!ret) { + *val = raw_data; + ret = IIO_VAL_INT; + } + } + vcnl4035_set_pm_runtime_state(data, false); + return ret; + case IIO_CHAN_INFO_INT_TIME: + *val = 50; + if (data->als_it_val) + *val = data->als_it_val * 100; + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + *val = 64; + if (!data->als_it_val) + *val2 = 1000; + else + *val2 = data->als_it_val * 2 * 1000; + return IIO_VAL_FRACTIONAL; + default: + return -EINVAL; + } +} + +static int vcnl4035_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + int ret; + struct vcnl4035_data *data = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_INT_TIME: + if (val <= 0 || val > 800) + return -EINVAL; + + ret = vcnl4035_set_pm_runtime_state(data, true); + if (ret < 0) + return ret; + + ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF, + VCNL4035_ALS_IT_MASK, + val / 100); + if (!ret) + data->als_it_val = val / 100; + + vcnl4035_set_pm_runtime_state(data, false); + return ret; + default: + return -EINVAL; + } +} + +/* No direct ABI for persistence and threshold, so eventing */ +static int vcnl4035_read_thresh(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 vcnl4035_data *data = iio_priv(indio_dev); + + switch (info) { + case IIO_EV_INFO_VALUE: + switch (dir) { + case IIO_EV_DIR_RISING: + *val = data->als_thresh_high; + return IIO_VAL_INT; + case IIO_EV_DIR_FALLING: + *val = data->als_thresh_low; + return IIO_VAL_INT; + default: + return -EINVAL; + } + break; + case IIO_EV_INFO_PERIOD: + *val = data->als_persistence; + return IIO_VAL_INT; + default: + return -EINVAL; + } + +} + +static int vcnl4035_write_thresh(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 vcnl4035_data *data = iio_priv(indio_dev); + int ret; + + switch (info) { + case IIO_EV_INFO_VALUE: + /* 16 bit threshold range 0 - 65535 */ + if (val < 0 || val > 65535) + return -EINVAL; + if (dir == IIO_EV_DIR_RISING) { + if (val < data->als_thresh_low) + return -EINVAL; + ret = regmap_write(data->regmap, VCNL4035_ALS_THDH, + val); + if (ret) + return ret; + data->als_thresh_high = val; + } else { + if (val > data->als_thresh_high) + return -EINVAL; + ret = regmap_write(data->regmap, VCNL4035_ALS_THDL, + val); + if (ret) + return ret; + data->als_thresh_low = val; + } + return ret; + case IIO_EV_INFO_PERIOD: + /* allow only 1 2 4 8 as persistence value */ + if (val < 0 || val > 8 || hweight8(val) != 1) + return -EINVAL; + ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF, + VCNL4035_ALS_PERS_MASK, val); + if (!ret) + data->als_persistence = val; + return ret; + default: + return -EINVAL; + } +} + +static IIO_CONST_ATTR_INT_TIME_AVAIL("50 100 200 400 800"); + +static struct attribute *vcnl4035_attributes[] = { + &iio_const_attr_integration_time_available.dev_attr.attr, + NULL, +}; + +static const struct attribute_group vcnl4035_attribute_group = { + .attrs = vcnl4035_attributes, +}; + +static const struct iio_info vcnl4035_info = { + .read_raw = vcnl4035_read_raw, + .write_raw = vcnl4035_write_raw, + .read_event_value = vcnl4035_read_thresh, + .write_event_value = vcnl4035_write_thresh, + .attrs = &vcnl4035_attribute_group, +}; + +static const struct iio_event_spec vcnl4035_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), + }, +}; + +enum vcnl4035_scan_index_order { + VCNL4035_CHAN_INDEX_LIGHT, + VCNL4035_CHAN_INDEX_WHITE_LED, +}; + +static const struct iio_buffer_setup_ops iio_triggered_buffer_setup_ops = { + .validate_scan_mask = &iio_validate_scan_mask_onehot, +}; + +static const struct iio_chan_spec vcnl4035_channels[] = { + { + .type = IIO_LIGHT, + .channel = 0, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_INT_TIME) | + BIT(IIO_CHAN_INFO_SCALE), + .event_spec = vcnl4035_event_spec, + .num_event_specs = ARRAY_SIZE(vcnl4035_event_spec), + .scan_index = VCNL4035_CHAN_INDEX_LIGHT, + .scan_type = { + .sign = 'u', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_LE, + }, + }, + { + .type = IIO_INTENSITY, + .channel = 1, + .modified = 1, + .channel2 = IIO_MOD_LIGHT_BOTH, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + .scan_index = VCNL4035_CHAN_INDEX_WHITE_LED, + .scan_type = { + .sign = 'u', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_LE, + }, + }, +}; + +static int vcnl4035_set_als_power_state(struct vcnl4035_data *data, u8 status) +{ + return regmap_update_bits(data->regmap, VCNL4035_ALS_CONF, + VCNL4035_MODE_ALS_MASK, + status); +} + +static int vcnl4035_init(struct vcnl4035_data *data) +{ + int ret; + int id; + + ret = regmap_read(data->regmap, VCNL4035_DEV_ID, &id); + if (ret < 0) { + dev_err(&data->client->dev, "Failed to read DEV_ID register\n"); + return ret; + } + + id = FIELD_GET(VCNL4035_DEV_ID_MASK, id); + if (id != VCNL4035_DEV_ID_VAL) { + dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n", + id, VCNL4035_DEV_ID_VAL); + return -ENODEV; + } + + ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_ENABLE); + if (ret < 0) + return ret; + + /* ALS white channel enable */ + ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF, + VCNL4035_MODE_ALS_WHITE_CHAN, + 1); + if (ret) { + dev_err(&data->client->dev, "set white channel enable %d\n", + ret); + return ret; + } + + /* set default integration time - 100 ms for ALS */ + ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF, + VCNL4035_ALS_IT_MASK, + VCNL4035_ALS_IT_DEFAULT); + if (ret) { + dev_err(&data->client->dev, "set default ALS IT returned %d\n", + ret); + return ret; + } + data->als_it_val = VCNL4035_ALS_IT_DEFAULT; + + /* set default persistence time - 1 for ALS */ + ret = regmap_update_bits(data->regmap, VCNL4035_ALS_CONF, + VCNL4035_ALS_PERS_MASK, + VCNL4035_ALS_PERS_DEFAULT); + if (ret) { + dev_err(&data->client->dev, "set default PERS returned %d\n", + ret); + return ret; + } + data->als_persistence = VCNL4035_ALS_PERS_DEFAULT; + + /* set default HIGH threshold for ALS */ + ret = regmap_write(data->regmap, VCNL4035_ALS_THDH, + VCNL4035_ALS_THDH_DEFAULT); + if (ret) { + dev_err(&data->client->dev, "set default THDH returned %d\n", + ret); + return ret; + } + data->als_thresh_high = VCNL4035_ALS_THDH_DEFAULT; + + /* set default LOW threshold for ALS */ + ret = regmap_write(data->regmap, VCNL4035_ALS_THDL, + VCNL4035_ALS_THDL_DEFAULT); + if (ret) { + dev_err(&data->client->dev, "set default THDL returned %d\n", + ret); + return ret; + } + data->als_thresh_low = VCNL4035_ALS_THDL_DEFAULT; + + return 0; +} + +static bool vcnl4035_is_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case VCNL4035_ALS_CONF: + case VCNL4035_DEV_ID: + return false; + default: + return true; + } +} + +static const struct regmap_config vcnl4035_regmap_config = { + .name = VCNL4035_REGMAP_NAME, + .reg_bits = 8, + .val_bits = 16, + .max_register = VCNL4035_DEV_ID, + .cache_type = REGCACHE_RBTREE, + .volatile_reg = vcnl4035_is_volatile_reg, + .val_format_endian = REGMAP_ENDIAN_LITTLE, +}; + +static int vcnl4035_probe_trigger(struct iio_dev *indio_dev) +{ + int ret; + struct vcnl4035_data *data = iio_priv(indio_dev); + + data->drdy_trigger0 = devm_iio_trigger_alloc( + indio_dev->dev.parent, + "%s-dev%d", indio_dev->name, indio_dev->id); + if (!data->drdy_trigger0) + return -ENOMEM; + + data->drdy_trigger0->dev.parent = indio_dev->dev.parent; + data->drdy_trigger0->ops = &vcnl4035_trigger_ops; + iio_trigger_set_drvdata(data->drdy_trigger0, indio_dev); + ret = devm_iio_trigger_register(indio_dev->dev.parent, + data->drdy_trigger0); + if (ret) { + dev_err(&data->client->dev, "iio trigger register failed\n"); + return ret; + } + + /* Trigger setup */ + ret = devm_iio_triggered_buffer_setup(indio_dev->dev.parent, indio_dev, + NULL, vcnl4035_trigger_consumer_handler, + &iio_triggered_buffer_setup_ops); + if (ret < 0) { + dev_err(&data->client->dev, "iio triggered buffer setup failed\n"); + return ret; + } + + /* IRQ to trigger mapping */ + ret = devm_request_threaded_irq(&data->client->dev, data->client->irq, + NULL, vcnl4035_drdy_irq_thread, + IRQF_TRIGGER_LOW | IRQF_ONESHOT, + VCNL4035_IRQ_NAME, indio_dev); + if (ret < 0) + dev_err(&data->client->dev, "request irq %d for trigger0 failed\n", + data->client->irq); + return ret; +} + +static int vcnl4035_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct vcnl4035_data *data; + struct iio_dev *indio_dev; + struct regmap *regmap; + int ret; + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + regmap = devm_regmap_init_i2c(client, &vcnl4035_regmap_config); + if (IS_ERR(regmap)) { + dev_err(&client->dev, "regmap_init failed!\n"); + return PTR_ERR(regmap); + } + + data = iio_priv(indio_dev); + i2c_set_clientdata(client, indio_dev); + data->client = client; + data->regmap = regmap; + + indio_dev->info = &vcnl4035_info; + indio_dev->name = VCNL4035_DRV_NAME; + indio_dev->channels = vcnl4035_channels; + indio_dev->num_channels = ARRAY_SIZE(vcnl4035_channels); + indio_dev->modes = INDIO_DIRECT_MODE; + + ret = vcnl4035_init(data); + if (ret < 0) { + dev_err(&client->dev, "vcnl4035 chip init failed\n"); + return ret; + } + + if (client->irq > 0) { + ret = vcnl4035_probe_trigger(indio_dev); + if (ret < 0) { + dev_err(&client->dev, "vcnl4035 unable init trigger\n"); + goto fail_poweroff; + } + } + + ret = pm_runtime_set_active(&client->dev); + if (ret < 0) + goto fail_poweroff; + + ret = iio_device_register(indio_dev); + if (ret < 0) + goto fail_poweroff; + + pm_runtime_enable(&client->dev); + pm_runtime_set_autosuspend_delay(&client->dev, VCNL4035_SLEEP_DELAY_MS); + pm_runtime_use_autosuspend(&client->dev); + + return 0; + +fail_poweroff: + vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_DISABLE); + return ret; +} + +static int vcnl4035_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + + pm_runtime_dont_use_autosuspend(&client->dev); + pm_runtime_disable(&client->dev); + iio_device_unregister(indio_dev); + pm_runtime_set_suspended(&client->dev); + + return vcnl4035_set_als_power_state(iio_priv(indio_dev), + VCNL4035_MODE_ALS_DISABLE); +} + +static int __maybe_unused vcnl4035_runtime_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + struct vcnl4035_data *data = iio_priv(indio_dev); + int ret; + + ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_DISABLE); + regcache_mark_dirty(data->regmap); + + return ret; +} + +static int __maybe_unused vcnl4035_runtime_resume(struct device *dev) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + struct vcnl4035_data *data = iio_priv(indio_dev); + int ret; + + regcache_sync(data->regmap); + ret = vcnl4035_set_als_power_state(data, VCNL4035_MODE_ALS_ENABLE); + if (ret < 0) + return ret; + + /* wait for 1 ALS integration cycle */ + msleep(data->als_it_val * 100); + + return 0; +} + +static const struct dev_pm_ops vcnl4035_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) + SET_RUNTIME_PM_OPS(vcnl4035_runtime_suspend, + vcnl4035_runtime_resume, NULL) +}; + +static const struct of_device_id vcnl4035_of_match[] = { + { .compatible = "vishay,vcnl4035", }, + { } +}; +MODULE_DEVICE_TABLE(of, vcnl4035_of_match); + +static struct i2c_driver vcnl4035_driver = { + .driver = { + .name = VCNL4035_DRV_NAME, + .pm = &vcnl4035_pm_ops, + .of_match_table = vcnl4035_of_match, + }, + .probe = vcnl4035_probe, + .remove = vcnl4035_remove, +}; + +module_i2c_driver(vcnl4035_driver); + +MODULE_AUTHOR("Parthiban Nallathambi <pn@denx.de>"); +MODULE_DESCRIPTION("VCNL4035 Ambient Light Sensor driver"); +MODULE_LICENSE("GPL v2"); |