This patch adds support for Intersil isl76683 light sensor. Signed-off-by: Christoph Fritz <chf.fritz@xxxxxxxxxxxxxx> --- drivers/iio/light/Kconfig | 12 + drivers/iio/light/Makefile | 1 + drivers/iio/light/isl76683.c | 693 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 706 insertions(+) create mode 100644 drivers/iio/light/isl76683.c diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig index 2356ed9..4f0882c 100644 --- a/drivers/iio/light/Kconfig +++ b/drivers/iio/light/Kconfig @@ -194,6 +194,18 @@ config ISL29125 To compile this driver as a module, choose M here: the module will be called isl29125. +config ISL76683 + tristate "Intersil ISL76683 light sensor" + depends on I2C + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER + help + Say Y here if you want to build a driver for the Intersil ISL76683 + light sensor for I2C. + + To compile this driver as a module, choose M here: the module will be + called isl76683. + config HID_SENSOR_ALS depends on HID_SENSOR_HUB select IIO_BUFFER diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile index fa32fa4..886a51f 100644 --- a/drivers/iio/light/Makefile +++ b/drivers/iio/light/Makefile @@ -22,6 +22,7 @@ obj-$(CONFIG_HID_SENSOR_PROX) += hid-sensor-prox.o obj-$(CONFIG_SENSORS_ISL29018) += isl29018.o obj-$(CONFIG_SENSORS_ISL29028) += isl29028.o obj-$(CONFIG_ISL29125) += isl29125.o +obj-$(CONFIG_ISL76683) += isl76683.o obj-$(CONFIG_JSA1212) += jsa1212.o obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o obj-$(CONFIG_LTR501) += ltr501.o diff --git a/drivers/iio/light/isl76683.c b/drivers/iio/light/isl76683.c new file mode 100644 index 0000000..b730276 --- /dev/null +++ b/drivers/iio/light/isl76683.c @@ -0,0 +1,693 @@ +/* + * IIO driver for the light sensor ISL76683. + * + * Copyright (c) 2017 Christoph Fritz <chf.fritz@xxxxxxxxxxxxxx> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * Datasheet: + * http://www.intersil.com/content/dam/Intersil/documents/isl7/isl76683.pdf + */ + +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/pm_runtime.h> +#include <linux/regmap.h> +#include <linux/util_macros.h> +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/buffer.h> +#include <linux/iio/trigger.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/triggered_buffer.h> + +#define ISL76683_REG_CMD 0x00 +#define ISL76683_REG_CTRL 0x01 +#define ISL76683_REG_THR_HI 0x02 +#define ISL76683_REG_THR_LO 0x03 +#define ISL76683_REG_SENSOR_L 0x04 +#define ISL76683_REG_SENSOR_M 0x05 +#define ISL76683_REG_CLEAR_INT 0x40 +#define ISL76683_REGMAP_MAX 0x40 + +#define ISL76683_CMD_ENABLE BIT(7) +#define ISL76683_CMD_PWRDWN BIT(6) +#define ISL76683_WIDTH_MASK 0x3 +#define ISL76683_PHOTOD_SHFT 2 +#define ISL76683_PHOTOD_MASK (0x3 << ISL76683_PHOTOD_SHFT) +#define ISL76683_INTPERS_MASK 0x3 +#define ISL76683_LUXRANGE_SHFT 2 +#define ISL76683_LUXRANGE_MASK (0x3 << ISL76683_LUXRANGE_SHFT) +#define ISL76683_LUXRANGE_STR "1000 4000 16000 64000" + +enum isl76683_dmode { + ISL76683_DIODE_0 = 0, + ISL76683_DIODE_IR, + ISL76683_DIODE_DIFF, +}; + +enum isl76683_lux_range { + ISL76683_LUX_1000 = 0, + ISL76683_LUX_4000, + ISL76683_LUX_16000, + ISL76683_LUX_64000, +}; + +static const int isl76683_lux_ranges_available[] = { + 1000, 4000, 16000, 64000}; + +#define ISL76683_LUX_RANGE_DEFAULT ISL76683_LUX_1000 +#define ISL76683_DIODE_MAX ISL76683_DIODE_DIFF +#define ISL76683_DIODE_DEFAULT ISL76683_DIODE_0 +#define ISL76683_WIDTH_DEFAULT 0x0 +#define ISL76683_RESOLUTION_DEFAULT 16 +#define ISL76683_EXT_RESISTOR_DEFAULT 100 +#define ISL76683_KOHM_MIN 1 +#define ISL76683_KOHM_MAX 1000 +#define ISL76683_INTPERS_DEFAULT 0x0 +#define ISL76683_THR_DEFAULT 0x7f + +struct isl76683_chip { + enum isl76683_lux_range luxrange; + int external_resistor; + enum isl76683_dmode photodiode; + struct i2c_client *client; + struct regmap *rmp; + struct completion irq_complete; + struct iio_trigger *trig; + bool trig_enabled; + struct mutex lock; + __le16 *buffer; + s64 time_ns; + bool buffer_running; +}; + +static bool isl76683_readable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case ISL76683_REG_CMD: + case ISL76683_REG_CTRL: + case ISL76683_REG_THR_HI: + case ISL76683_REG_THR_LO: + case ISL76683_REG_SENSOR_L: + case ISL76683_REG_SENSOR_M: + case ISL76683_REG_CLEAR_INT: + return true; + default: + return false; + } +} + +static bool isl76683_writeable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case ISL76683_REG_CMD: + case ISL76683_REG_CTRL: + case ISL76683_REG_THR_HI: + case ISL76683_REG_THR_LO: + return true; + default: + return false; + } +} + +static bool isl76683_is_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case ISL76683_REG_SENSOR_L: + case ISL76683_REG_SENSOR_M: + case ISL76683_REG_CLEAR_INT: + return true; + default: + return false; + } +} + +static const struct regmap_config isl76683_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = ISL76683_REGMAP_MAX, + .readable_reg = isl76683_readable_reg, + .writeable_reg = isl76683_writeable_reg, + .volatile_reg = isl76683_is_volatile_reg, + .cache_type = REGCACHE_RBTREE, +}; + +static int isl76683_set_config(struct isl76683_chip *chip) +{ + int ret; + + ret = regmap_update_bits(chip->rmp, ISL76683_REG_CTRL, + ISL76683_LUXRANGE_MASK | ISL76683_INTPERS_MASK, + (chip->luxrange << ISL76683_LUXRANGE_SHFT) | + ISL76683_INTPERS_DEFAULT); + if (ret < 0) + return ret; + + ret = regmap_update_bits(chip->rmp, ISL76683_REG_CMD, + ISL76683_PHOTOD_MASK | ISL76683_WIDTH_MASK, + (chip->photodiode << ISL76683_PHOTOD_SHFT) | + ISL76683_WIDTH_DEFAULT); + if (ret < 0) + return ret; + + ret = regmap_write(chip->rmp, ISL76683_REG_THR_HI, + ISL76683_THR_DEFAULT); + if (ret < 0) + return ret; + + ret = regmap_write(chip->rmp, ISL76683_REG_THR_LO, + ISL76683_THR_DEFAULT); + if (ret < 0) + return ret; + + return 0; +} + +static int isl76683_power(struct isl76683_chip *chip, bool on) +{ + int ret; + + ret = regmap_update_bits(chip->rmp, ISL76683_REG_CMD, + ISL76683_CMD_ENABLE | ISL76683_CMD_PWRDWN, + 0x0); + if (ret < 0) + return ret; + + ret = regmap_update_bits(chip->rmp, ISL76683_REG_CMD, + ISL76683_CMD_ENABLE | ISL76683_CMD_PWRDWN, + on ? ISL76683_CMD_ENABLE : ISL76683_CMD_PWRDWN); + if (ret < 0) + return ret; + + return on ? isl76683_set_config(chip) : 0; +} + +static int isl76683_reset(struct isl76683_chip *chip) +{ + int ret; + + ret = isl76683_power(chip, false); + if (ret < 0) + return ret; + + return isl76683_power(chip, true); +} + +static int isl76683_read_lux(struct isl76683_chip *chip, + bool is_processed, int *val) +{ + unsigned int sensor_data, range, fsr; + __le16 sensor_raw; + int ret; + + ret = regmap_bulk_read(chip->rmp, ISL76683_REG_SENSOR_L, + &sensor_raw, sizeof(sensor_raw)); + if (ret) + return ret; + + sensor_data = le16_to_cpu(sensor_raw); + + if (!is_processed) { + *val = sensor_data; + return 0; + } + + /* range values taken from datasheet (table 9) */ + if (chip->luxrange == ISL76683_LUX_1000) + range = 973; + else if (chip->luxrange == ISL76683_LUX_4000) + range = 3892; + else if (chip->luxrange == ISL76683_LUX_16000) + range = 15568; + else if (chip->luxrange == ISL76683_LUX_64000) + range = 62272; + else + return -EINVAL; + + /* equations from datasheet (EQ.3 and EQ.4) */ + fsr = (100 * range) / chip->external_resistor; + *val = (fsr * sensor_data) / (1 << ISL76683_RESOLUTION_DEFAULT); + + return 0; +} + +static irqreturn_t isl76683_interrupt_handler(int irq, void *private) +{ + struct iio_dev *indio_dev = private; + struct isl76683_chip *chip = iio_priv(indio_dev); + + chip->time_ns = iio_get_time_ns(indio_dev); + + if (chip->trig_enabled) + iio_trigger_poll(chip->trig); + + if (!completion_done(&chip->irq_complete)) + complete(&chip->irq_complete); + + return IRQ_HANDLED; +} + +static inline int isl76683_start_measurement(struct isl76683_chip *chip) +{ + int dummy; + + /* dummy read is clearing irq and triggers new measurement */ + return regmap_read(chip->rmp, ISL76683_REG_CLEAR_INT, &dummy); +} + +static int isl76683_singleshot_conversion(struct isl76683_chip *chip, + const struct iio_chan_spec *chan, + bool is_processed, int *val) +{ + long timeout; + int ret; + + if (chip->buffer_running) + return -EAGAIN; + + switch (chan->channel2) { + case IIO_MOD_LIGHT_BOTH: + chip->photodiode = ISL76683_DIODE_DIFF; + break; + case IIO_MOD_LIGHT_IR: + chip->photodiode = ISL76683_DIODE_IR; + break; + default: + chip->photodiode = ISL76683_DIODE_0; + } + + ret = isl76683_set_config(chip); + if (ret) + return ret; + + ret = isl76683_start_measurement(chip); + if (ret < 0) + return ret; + + /* wait for measurement to complete */ + timeout = wait_for_completion_interruptible_timeout( + &chip->irq_complete, + msecs_to_jiffies(5000)); + if (timeout == 0) { + dev_err(&chip->client->dev, "measurement timed out\n"); + return -ETIMEDOUT; + } else if (timeout < 0) { + dev_err(&chip->client->dev, "wait for measurement failed\n"); + return -EINTR; + } + + ret = isl76683_read_lux(chip, is_processed, val); + if (ret) { + dev_err(&chip->client->dev, "%s: Error %d reading lux\n", + __func__, ret); + return ret; + } + + return IIO_VAL_INT; +} + +static irqreturn_t isl76683_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct isl76683_chip *chip = iio_priv(indio_dev); + __le16 buf; + int ret; + + ret = regmap_bulk_read(chip->rmp, ISL76683_REG_SENSOR_L, &buf, 2); + if (ret) + return ret; + + chip->buffer[0] = le16_to_cpu(buf); + + iio_push_to_buffers_with_timestamp(indio_dev, chip->buffer, + chip->time_ns); + + iio_trigger_notify_done(indio_dev->trig); + + ret = isl76683_start_measurement(chip); + if (ret < 0) + return ret; + + return IRQ_HANDLED; +} + +static int isl76683_buffer_preenable(struct iio_dev *indio_dev) +{ + struct isl76683_chip *chip = iio_priv(indio_dev); + + mutex_lock(&chip->lock); + chip->buffer_running = true; + mutex_unlock(&chip->lock); + chip->photodiode = indio_dev->channels[0].channel2; + return isl76683_set_config(chip); +} + +static int isl76683_buffer_postdisable(struct iio_dev *indio_dev) +{ + struct isl76683_chip *chip = iio_priv(indio_dev); + + chip->buffer_running = false; + return 0; +} + +static const struct iio_buffer_setup_ops isl76683_buffer_setup_ops = { + .preenable = &isl76683_buffer_preenable, + .postdisable = &isl76683_buffer_postdisable, + .predisable = iio_triggered_buffer_predisable, + .postenable = iio_triggered_buffer_postenable, + .validate_scan_mask = &iio_validate_scan_mask_onehot, +}; + +static int isl76683_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct isl76683_chip *chip = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + mutex_lock(&chip->lock); + ret = isl76683_singleshot_conversion(chip, chan, false, val); + mutex_unlock(&chip->lock); + return ret; + case IIO_CHAN_INFO_PROCESSED: + mutex_lock(&chip->lock); + ret = isl76683_singleshot_conversion(chip, chan, true, val); + mutex_unlock(&chip->lock); + return ret; + case IIO_CHAN_INFO_HARDWAREGAIN: + *val = isl76683_lux_ranges_available[chip->luxrange]; + return IIO_VAL_INT; + } + + return -EINVAL; +} + +static int isl76683_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct isl76683_chip *chip = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_HARDWAREGAIN: + mutex_lock(&chip->lock); + chip->luxrange = find_closest(val, + isl76683_lux_ranges_available, + ARRAY_SIZE(isl76683_lux_ranges_available)); + ret = isl76683_set_config(chip); + mutex_unlock(&chip->lock); + return ret; + } + + return -EINVAL; +} + +static IIO_CONST_ATTR(in_illuminance_hardwaregain_available, + ISL76683_LUXRANGE_STR); + +static struct attribute *isl76683_attributes[] = { + &iio_const_attr_in_illuminance_hardwaregain_available.dev_attr.attr, + NULL +}; + +static const struct attribute_group isl76683_attribute_group = { + .attrs = isl76683_attributes, +}; + +#define ISL76683_CHANNEL_2(_ch2, _si) { \ + .type = IIO_LIGHT, \ + .modified = 1, \ + .channel2 = _ch2, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_PROCESSED), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_HARDWAREGAIN), \ + .scan_index = _si, \ + .scan_type = { \ + .sign = 'u', \ + .realbits = 16, \ + .storagebits = 16, \ + .endianness = IIO_CPU, \ + }, \ +} + +static const struct iio_chan_spec isl76683_channels[] = { + { + .type = IIO_LIGHT, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_PROCESSED), + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_HARDWAREGAIN), + .scan_index = 0, + .scan_type = { + .sign = 'u', + .realbits = 16, + .storagebits = 16, + .endianness = IIO_CPU, + }, + }, + ISL76683_CHANNEL_2(IIO_MOD_LIGHT_IR, 1), + ISL76683_CHANNEL_2(IIO_MOD_LIGHT_BOTH, 2), + IIO_CHAN_SOFT_TIMESTAMP(3), +}; + +static int isl76683_update_scan_mode(struct iio_dev *indio_dev, + const unsigned long *scan_mask) +{ + struct isl76683_chip *chip = iio_priv(indio_dev); + + kfree(chip->buffer); + chip->buffer = kzalloc(indio_dev->scan_bytes, GFP_KERNEL); + if (chip->buffer == NULL) + return -ENOMEM; + + return 0; +} + +static const struct iio_info isl76683_info = { + .update_scan_mode = isl76683_update_scan_mode, + .read_raw = isl76683_read_raw, + .write_raw = isl76683_write_raw, + .attrs = &isl76683_attribute_group, + .driver_module = THIS_MODULE, +}; + +static int isl76683_set_trigger_state(struct iio_trigger *trig, bool enable) +{ + struct isl76683_chip *chip = iio_trigger_get_drvdata(trig); + int ret; + + if (enable) { + chip->trig_enabled = true; + ret = isl76683_start_measurement(chip); + if (ret < 0) + return ret; + } else + chip->trig_enabled = false; + + return 0; +} + +static const struct iio_trigger_ops isl76683_trigger_ops = { + .owner = THIS_MODULE, + .set_trigger_state = isl76683_set_trigger_state, + .validate_device = iio_trigger_validate_own_device, +}; + +static int isl76683_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct isl76683_chip *chip; + struct iio_dev *indio_dev; + struct device_node *np = client->dev.of_node; + int rs = ISL76683_EXT_RESISTOR_DEFAULT; + int v, ret; + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip)); + if (!indio_dev) + return -ENOMEM; + + chip = iio_priv(indio_dev); + + i2c_set_clientdata(client, indio_dev); + chip->client = client; + + if (np) { + ret = of_property_read_u32(np, "isil,external-resistor", &v); + if (ret || v < ISL76683_KOHM_MIN || v > ISL76683_KOHM_MAX) + dev_warn(&client->dev, + "assuming %i kOhm resistor\n", rs); + else + rs = v; + } + + chip->luxrange = ISL76683_LUX_RANGE_DEFAULT; + chip->external_resistor = rs; + chip->photodiode = ISL76683_DIODE_DEFAULT; + chip->buffer_running = false; + + chip->rmp = devm_regmap_init_i2c(client, &isl76683_regmap_config); + if (IS_ERR(chip->rmp)) { + ret = PTR_ERR(chip->rmp); + dev_err(&client->dev, "%s: Error %d initializing regmap\n", + __func__, ret); + return ret; + } + + mutex_init(&chip->lock); + + init_completion(&chip->irq_complete); + + if (!client->irq) { + dev_err(&client->dev, "no interrupt configured\n"); + return -EINVAL; + } + + indio_dev->dev.parent = &client->dev; + indio_dev->info = &isl76683_info; + indio_dev->channels = isl76683_channels; + indio_dev->num_channels = ARRAY_SIZE(isl76683_channels); + indio_dev->name = id->name; + indio_dev->modes = INDIO_DIRECT_MODE; + + chip->trig_enabled = false; + chip->trig = devm_iio_trigger_alloc(&client->dev, "%s-dev%d", + indio_dev->name, indio_dev->id); + if (!chip->trig) + return -ENOMEM; + + chip->trig->ops = &isl76683_trigger_ops; + chip->trig->dev.parent = &client->dev; + iio_trigger_set_drvdata(chip->trig, chip); + + ret = devm_request_irq(&client->dev, client->irq, + isl76683_interrupt_handler, + IRQF_TRIGGER_FALLING | IRQF_ONESHOT, + "isl76683_event", indio_dev); + if (ret) { + dev_err(&client->dev, "irq request error\n"); + return ret; + } + + ret = devm_iio_trigger_register(&client->dev, chip->trig); + if (ret) { + dev_err(&client->dev, "iio_trigger register error\n"); + return ret; + } + + ret = isl76683_reset(chip); + if (ret) { + dev_err(&client->dev, "reset failed\n"); + return ret; + } + + ret = isl76683_read_lux(chip, false, &v); + if (ret) { + dev_err(&client->dev, "initial dummy readout failed\n"); + return ret; + } + + ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL, + &isl76683_trigger_handler, &isl76683_buffer_setup_ops); + if (ret) + return ret; + + ret = devm_iio_device_register(&client->dev, indio_dev); + if (ret) { + dev_err(&client->dev, + "%s(): iio registration failed with error %d\n", + __func__, ret); + return ret; + } + + return ret; +} + +static int isl76683_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + struct isl76683_chip *chip = iio_priv(indio_dev); + + pm_runtime_disable(&client->dev); + pm_runtime_set_suspended(&client->dev); + isl76683_power(chip, false); + kfree(chip->buffer); + + return 0; +} + +#if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM) +static int isl76683_runtime_suspend(struct device *dev) +{ + struct isl76683_chip *chip = + iio_priv(i2c_get_clientdata(to_i2c_client(dev))); + int ret; + + mutex_lock(&chip->lock); + ret = isl76683_power(chip, false); + regcache_mark_dirty(chip->rmp); + mutex_unlock(&chip->lock); + + return ret; +} + +static int isl76683_runtime_resume(struct device *dev) +{ + struct isl76683_chip *chip = + iio_priv(i2c_get_clientdata(to_i2c_client(dev))); + int ret; + + mutex_lock(&chip->lock); + ret = isl76683_power(chip, true); + mutex_unlock(&chip->lock); + + return ret; +} +#endif + +static const struct dev_pm_ops isl76683_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) + SET_RUNTIME_PM_OPS(isl76683_runtime_suspend, + isl76683_runtime_resume, NULL) +}; + +static const struct i2c_device_id isl76683_id[] = { + {"isl76683", 0}, + {} +}; +MODULE_DEVICE_TABLE(i2c, isl76683_id); + +static const struct of_device_id isl76683_of_match[] = { + { .compatible = "isil,isl76683", }, + { }, +}; +MODULE_DEVICE_TABLE(of, isl76683_of_match); + +static struct i2c_driver isl76683_driver = { + .driver = { + .name = "isl76683", + .of_match_table = isl76683_of_match, + .pm = &isl76683_pm_ops, + }, + .probe = isl76683_probe, + .remove = isl76683_remove, + .id_table = isl76683_id, +}; + +module_i2c_driver(isl76683_driver); + +MODULE_DESCRIPTION("ISL76683 Ambient Light Sensor driver"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Christoph Fritz <chf.fritz@xxxxxxxxxxxxxx>"); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
