iio: light: add support for UVIS25 sensor (3025c868) · Commits · e / devices / android_kernel_teracube_mt6765

drivers/iio/light/Kconfig

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		@@ -334,6 +334,30 @@ config STK3310
		Choosing M will build the driver as a module. If so, the module
		will be called stk3310.

		config ST_UVIS25
		tristate "STMicroelectronics UVIS25 sensor driver"
		depends on (I2C \|\| SPI)
		select IIO_BUFFER
		select IIO_TRIGGERED_BUFFER
		select ST_UVIS25_I2C if (I2C)
		select ST_UVIS25_SPI if (SPI_MASTER)
		help
		Say yes here to build support for STMicroelectronics UVIS25
		uv sensor

		To compile this driver as a module, choose M here: the module
		will be called st_uvis25.

		config ST_UVIS25_I2C
		tristate
		depends on ST_UVIS25
		select REGMAP_I2C

		config ST_UVIS25_SPI
		tristate
		depends on ST_UVIS25
		select REGMAP_SPI

		config TCS3414
		tristate "TAOS TCS3414 digital color sensor"
		depends on I2C

drivers/iio/light/Makefile

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		@@ -33,6 +33,9 @@ obj-$(CONFIG_RPR0521) += rpr0521.o
		obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o
		obj-$(CONFIG_SI1145) += si1145.o
		obj-$(CONFIG_STK3310) += stk3310.o
		obj-$(CONFIG_ST_UVIS25) += st_uvis25_core.o
		obj-$(CONFIG_ST_UVIS25_I2C) += st_uvis25_i2c.o
		obj-$(CONFIG_ST_UVIS25_SPI) += st_uvis25_spi.o
		obj-$(CONFIG_TCS3414) += tcs3414.o
		obj-$(CONFIG_TCS3472) += tcs3472.o
		obj-$(CONFIG_TSL2583) += tsl2583.o

drivers/iio/light/st_uvis25.h

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		/*
		* STMicroelectronics uvis25 sensor driver
		*
		* Copyright 2017 STMicroelectronics Inc.
		*
		* Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
		*
		* Licensed under the GPL-2.
		*/

		#ifndef ST_UVIS25_H
		#define ST_UVIS25_H

		#define ST_UVIS25_DEV_NAME "uvis25"

		#include <linux/iio/iio.h>

		/**
		* struct st_uvis25_hw - ST UVIS25 sensor instance
		* @regmap: Register map of the device.
		* @trig: The trigger in use by the driver.
		* @enabled: Status of the sensor (false->off, true->on).
		* @irq: Device interrupt line (I2C or SPI).
		*/
		struct st_uvis25_hw {
		struct regmap *regmap;

		struct iio_trigger *trig;
		bool enabled;
		int irq;
		};

		extern const struct dev_pm_ops st_uvis25_pm_ops;

		int st_uvis25_probe(struct device dev, int irq, struct regmap regmap);

		#endif /* ST_UVIS25_H */

drivers/iio/light/st_uvis25_core.c

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		/*
		* STMicroelectronics uvis25 sensor driver
		*
		* Copyright 2017 STMicroelectronics Inc.
		*
		* Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
		*
		* Licensed under the GPL-2.
		*/

		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/device.h>
		#include <linux/iio/sysfs.h>
		#include <linux/delay.h>
		#include <linux/pm.h>
		#include <linux/interrupt.h>
		#include <linux/irqreturn.h>
		#include <linux/iio/trigger.h>
		#include <linux/iio/trigger_consumer.h>
		#include <linux/iio/triggered_buffer.h>
		#include <linux/iio/buffer.h>
		#include <linux/regmap.h>

		#include "st_uvis25.h"

		#define ST_UVIS25_REG_WHOAMI_ADDR 0x0f
		#define ST_UVIS25_REG_WHOAMI_VAL 0xca
		#define ST_UVIS25_REG_CTRL1_ADDR 0x20
		#define ST_UVIS25_REG_ODR_MASK BIT(0)
		#define ST_UVIS25_REG_BDU_MASK BIT(1)
		#define ST_UVIS25_REG_CTRL2_ADDR 0x21
		#define ST_UVIS25_REG_BOOT_MASK BIT(7)
		#define ST_UVIS25_REG_CTRL3_ADDR 0x22
		#define ST_UVIS25_REG_HL_MASK BIT(7)
		#define ST_UVIS25_REG_STATUS_ADDR 0x27
		#define ST_UVIS25_REG_UV_DA_MASK BIT(0)
		#define ST_UVIS25_REG_OUT_ADDR 0x28

		static const struct iio_chan_spec st_uvis25_channels[] = {
		{
		.type = IIO_UVINDEX,
		.address = ST_UVIS25_REG_OUT_ADDR,
		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
		.scan_index = 0,
		.scan_type = {
		.sign = 'u',
		.realbits = 8,
		.storagebits = 8,
		},
		},
		IIO_CHAN_SOFT_TIMESTAMP(1),
		};

		static int st_uvis25_check_whoami(struct st_uvis25_hw *hw)
		{
		int err, data;

		err = regmap_read(hw->regmap, ST_UVIS25_REG_WHOAMI_ADDR, &data);
		if (err < 0) {
		dev_err(regmap_get_device(hw->regmap),
		"failed to read whoami register\n");
		return err;
		}

		if (data != ST_UVIS25_REG_WHOAMI_VAL) {
		dev_err(regmap_get_device(hw->regmap),
		"wrong whoami {%02x vs %02x}\n",
		data, ST_UVIS25_REG_WHOAMI_VAL);
		return -ENODEV;
		}

		return 0;
		}

		static int st_uvis25_set_enable(struct st_uvis25_hw *hw, bool enable)
		{
		int err;

		err = regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL1_ADDR,
		ST_UVIS25_REG_ODR_MASK, enable);
		if (err < 0)
		return err;

		hw->enabled = enable;

		return 0;
		}

		static int st_uvis25_read_oneshot(struct st_uvis25_hw hw, u8 addr, int val)
		{
		int err;

		err = st_uvis25_set_enable(hw, true);
		if (err < 0)
		return err;

		msleep(1500);

		/*
		* in order to avoid possible race conditions with interrupt
		* generation, disable the sensor first and then poll output
		* register. That sequence guarantees the interrupt will be reset
		* when irq line is unmasked
		*/
		err = st_uvis25_set_enable(hw, false);
		if (err < 0)
		return err;

		err = regmap_read(hw->regmap, addr, val);

		return err < 0 ? err : IIO_VAL_INT;
		}

		static int st_uvis25_read_raw(struct iio_dev *iio_dev,
		struct iio_chan_spec const *ch,
		int val, int val2, long mask)
		{
		int ret;

		ret = iio_device_claim_direct_mode(iio_dev);
		if (ret)
		return ret;

		switch (mask) {
		case IIO_CHAN_INFO_PROCESSED: {
		struct st_uvis25_hw *hw = iio_priv(iio_dev);

		/*
		* mask irq line during oneshot read since the sensor
		* does not export the capability to disable data-ready line
		* in the register map and it is enabled by default.
		* If the line is unmasked during read_raw() it will be set
		* active and never reset since the trigger is disabled
		*/
		if (hw->irq > 0)
		disable_irq(hw->irq);
		ret = st_uvis25_read_oneshot(hw, ch->address, val);
		if (hw->irq > 0)
		enable_irq(hw->irq);
		break;
		}
		default:
		ret = -EINVAL;
		break;
		}

		iio_device_release_direct_mode(iio_dev);

		return ret;
		}

		static irqreturn_t st_uvis25_trigger_handler_thread(int irq, void *private)
		{
		struct st_uvis25_hw *hw = private;
		int err, status;

		err = regmap_read(hw->regmap, ST_UVIS25_REG_STATUS_ADDR, &status);
		if (err < 0)
		return IRQ_HANDLED;

		if (!(status & ST_UVIS25_REG_UV_DA_MASK))
		return IRQ_NONE;

		iio_trigger_poll_chained(hw->trig);

		return IRQ_HANDLED;
		}

		static int st_uvis25_allocate_trigger(struct iio_dev *iio_dev)
		{
		struct st_uvis25_hw *hw = iio_priv(iio_dev);
		struct device *dev = regmap_get_device(hw->regmap);
		bool irq_active_low = false;
		unsigned long irq_type;
		int err;

		irq_type = irqd_get_trigger_type(irq_get_irq_data(hw->irq));

		switch (irq_type) {
		case IRQF_TRIGGER_HIGH:
		case IRQF_TRIGGER_RISING:
		break;
		case IRQF_TRIGGER_LOW:
		case IRQF_TRIGGER_FALLING:
		irq_active_low = true;
		break;
		default:
		dev_info(dev, "mode %lx unsupported\n", irq_type);
		return -EINVAL;
		}

		err = regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL3_ADDR,
		ST_UVIS25_REG_HL_MASK, irq_active_low);
		if (err < 0)
		return err;

		err = devm_request_threaded_irq(dev, hw->irq, NULL,
		st_uvis25_trigger_handler_thread,
		irq_type \| IRQF_ONESHOT,
		iio_dev->name, hw);
		if (err) {
		dev_err(dev, "failed to request trigger irq %d\n",
		hw->irq);
		return err;
		}

		hw->trig = devm_iio_trigger_alloc(dev, "%s-trigger",
		iio_dev->name);
		if (!hw->trig)
		return -ENOMEM;

		iio_trigger_set_drvdata(hw->trig, iio_dev);
		hw->trig->dev.parent = dev;

		return devm_iio_trigger_register(dev, hw->trig);
		}

		static int st_uvis25_buffer_preenable(struct iio_dev *iio_dev)
		{
		return st_uvis25_set_enable(iio_priv(iio_dev), true);
		}

		static int st_uvis25_buffer_postdisable(struct iio_dev *iio_dev)
		{
		return st_uvis25_set_enable(iio_priv(iio_dev), false);
		}

		static const struct iio_buffer_setup_ops st_uvis25_buffer_ops = {
		.preenable = st_uvis25_buffer_preenable,
		.postenable = iio_triggered_buffer_postenable,
		.predisable = iio_triggered_buffer_predisable,
		.postdisable = st_uvis25_buffer_postdisable,
		};

		static irqreturn_t st_uvis25_buffer_handler_thread(int irq, void *p)
		{
		u8 buffer[ALIGN(sizeof(u8), sizeof(s64)) + sizeof(s64)];
		struct iio_poll_func *pf = p;
		struct iio_dev *iio_dev = pf->indio_dev;
		struct st_uvis25_hw *hw = iio_priv(iio_dev);
		int err;

		err = regmap_read(hw->regmap, ST_UVIS25_REG_OUT_ADDR, (int *)buffer);
		if (err < 0)
		goto out;

		iio_push_to_buffers_with_timestamp(iio_dev, buffer,
		iio_get_time_ns(iio_dev));

		out:
		iio_trigger_notify_done(hw->trig);

		return IRQ_HANDLED;
		}

		static int st_uvis25_allocate_buffer(struct iio_dev *iio_dev)
		{
		struct st_uvis25_hw *hw = iio_priv(iio_dev);

		return devm_iio_triggered_buffer_setup(regmap_get_device(hw->regmap),
		iio_dev, NULL,
		st_uvis25_buffer_handler_thread,
		&st_uvis25_buffer_ops);
		}

		static const struct iio_info st_uvis25_info = {
		.read_raw = st_uvis25_read_raw,
		};

		static int st_uvis25_init_sensor(struct st_uvis25_hw *hw)
		{
		int err;

		err = regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL2_ADDR,
		ST_UVIS25_REG_BOOT_MASK, 1);
		if (err < 0)
		return err;

		msleep(2000);

		return regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL1_ADDR,
		ST_UVIS25_REG_BDU_MASK, 1);
		}

		int st_uvis25_probe(struct device dev, int irq, struct regmap regmap)
		{
		struct st_uvis25_hw *hw;
		struct iio_dev *iio_dev;
		int err;

		iio_dev = devm_iio_device_alloc(dev, sizeof(*hw));
		if (!iio_dev)
		return -ENOMEM;

		dev_set_drvdata(dev, (void *)iio_dev);

		hw = iio_priv(iio_dev);
		hw->irq = irq;
		hw->regmap = regmap;

		err = st_uvis25_check_whoami(hw);
		if (err < 0)
		return err;

		iio_dev->modes = INDIO_DIRECT_MODE;
		iio_dev->dev.parent = dev;
		iio_dev->channels = st_uvis25_channels;
		iio_dev->num_channels = ARRAY_SIZE(st_uvis25_channels);
		iio_dev->name = ST_UVIS25_DEV_NAME;
		iio_dev->info = &st_uvis25_info;

		err = st_uvis25_init_sensor(hw);
		if (err < 0)
		return err;

		if (hw->irq > 0) {
		err = st_uvis25_allocate_buffer(iio_dev);
		if (err < 0)
		return err;

		err = st_uvis25_allocate_trigger(iio_dev);
		if (err)
		return err;
		}

		return devm_iio_device_register(dev, iio_dev);
		}
		EXPORT_SYMBOL(st_uvis25_probe);

		static int __maybe_unused st_uvis25_suspend(struct device *dev)
		{
		struct iio_dev *iio_dev = dev_get_drvdata(dev);
		struct st_uvis25_hw *hw = iio_priv(iio_dev);

		return regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL1_ADDR,
		ST_UVIS25_REG_ODR_MASK, 0);
		}

		static int __maybe_unused st_uvis25_resume(struct device *dev)
		{
		struct iio_dev *iio_dev = dev_get_drvdata(dev);
		struct st_uvis25_hw *hw = iio_priv(iio_dev);

		if (hw->enabled)
		return regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL1_ADDR,
		ST_UVIS25_REG_ODR_MASK, 1);

		return 0;
		}

		const struct dev_pm_ops st_uvis25_pm_ops = {
		SET_SYSTEM_SLEEP_PM_OPS(st_uvis25_suspend, st_uvis25_resume)
		};
		EXPORT_SYMBOL(st_uvis25_pm_ops);

		MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>");
		MODULE_DESCRIPTION("STMicroelectronics uvis25 sensor driver");
		MODULE_LICENSE("GPL v2");

drivers/iio/light/st_uvis25_i2c.c

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		/*
		* STMicroelectronics uvis25 i2c driver
		*
		* Copyright 2017 STMicroelectronics Inc.
		*
		* Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
		*
		* Licensed under the GPL-2.
		*/

		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/acpi.h>
		#include <linux/i2c.h>
		#include <linux/slab.h>
		#include <linux/regmap.h>

		#include "st_uvis25.h"

		#define UVIS25_I2C_AUTO_INCREMENT BIT(7)

		const struct regmap_config st_uvis25_i2c_regmap_config = {
		.reg_bits = 8,
		.val_bits = 8,
		.write_flag_mask = UVIS25_I2C_AUTO_INCREMENT,
		.read_flag_mask = UVIS25_I2C_AUTO_INCREMENT,
		};

		static int st_uvis25_i2c_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct regmap *regmap;

		regmap = devm_regmap_init_i2c(client, &st_uvis25_i2c_regmap_config);
		if (IS_ERR(regmap)) {
		dev_err(&client->dev, "Failed to register i2c regmap %d\n",
		(int)PTR_ERR(regmap));
		return PTR_ERR(regmap);
		}

		return st_uvis25_probe(&client->dev, client->irq, regmap);
		}

		static const struct of_device_id st_uvis25_i2c_of_match[] = {
		{ .compatible = "st,uvis25", },
		{},
		};
		MODULE_DEVICE_TABLE(of, st_uvis25_i2c_of_match);

		static const struct i2c_device_id st_uvis25_i2c_id_table[] = {
		{ ST_UVIS25_DEV_NAME },
		{},
		};
		MODULE_DEVICE_TABLE(i2c, st_uvis25_i2c_id_table);

		static struct i2c_driver st_uvis25_driver = {
		.driver = {
		.name = "st_uvis25_i2c",
		.pm = &st_uvis25_pm_ops,
		.of_match_table = of_match_ptr(st_uvis25_i2c_of_match),
		},
		.probe = st_uvis25_i2c_probe,
		.id_table = st_uvis25_i2c_id_table,
		};
		module_i2c_driver(st_uvis25_driver);

		MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>");
		MODULE_DESCRIPTION("STMicroelectronics uvis25 i2c driver");
		MODULE_LICENSE("GPL v2");