forked from Minki/linux
iio: light: add support for UVIS25 sensor
add support for STMicroelectronics UVIS25 uv sensor http://www.st.com/resource/en/datasheet/uvis25.pdf - continuos mode support - i2c support - spi support - trigger mode support - system PM support Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Lorenzo Bianconi
Jonathan Cameron
parent
f4457f7b17
commit
3025c8688c
@ -334,6 +334,30 @@ config STK3310
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Choosing M will build the driver as a module. If so, the module
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will be called stk3310.
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config ST_UVIS25
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tristate "STMicroelectronics UVIS25 sensor driver"
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depends on (I2C || SPI)
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select IIO_BUFFER
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select IIO_TRIGGERED_BUFFER
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select ST_UVIS25_I2C if (I2C)
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select ST_UVIS25_SPI if (SPI_MASTER)
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help
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Say yes here to build support for STMicroelectronics UVIS25
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uv sensor
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To compile this driver as a module, choose M here: the module
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will be called st_uvis25.
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config ST_UVIS25_I2C
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tristate
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depends on ST_UVIS25
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select REGMAP_I2C
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config ST_UVIS25_SPI
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tristate
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depends on ST_UVIS25
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select REGMAP_SPI
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config TCS3414
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tristate "TAOS TCS3414 digital color sensor"
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depends on I2C
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@ -33,6 +33,9 @@ obj-$(CONFIG_RPR0521) += rpr0521.o
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obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o
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obj-$(CONFIG_SI1145) += si1145.o
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obj-$(CONFIG_STK3310) += stk3310.o
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obj-$(CONFIG_ST_UVIS25) += st_uvis25_core.o
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obj-$(CONFIG_ST_UVIS25_I2C) += st_uvis25_i2c.o
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obj-$(CONFIG_ST_UVIS25_SPI) += st_uvis25_spi.o
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obj-$(CONFIG_TCS3414) += tcs3414.o
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obj-$(CONFIG_TCS3472) += tcs3472.o
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obj-$(CONFIG_TSL2583) += tsl2583.o
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37
drivers/iio/light/st_uvis25.h
Normal file
37
drivers/iio/light/st_uvis25.h
Normal file
@ -0,0 +1,37 @@
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/*
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* STMicroelectronics uvis25 sensor driver
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*
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* Copyright 2017 STMicroelectronics Inc.
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*
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* Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
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*
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* Licensed under the GPL-2.
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*/
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#ifndef ST_UVIS25_H
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#define ST_UVIS25_H
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#define ST_UVIS25_DEV_NAME "uvis25"
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#include <linux/iio/iio.h>
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/**
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* struct st_uvis25_hw - ST UVIS25 sensor instance
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* @regmap: Register map of the device.
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* @trig: The trigger in use by the driver.
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* @enabled: Status of the sensor (false->off, true->on).
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* @irq: Device interrupt line (I2C or SPI).
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*/
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struct st_uvis25_hw {
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struct regmap *regmap;
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struct iio_trigger *trig;
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bool enabled;
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int irq;
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};
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extern const struct dev_pm_ops st_uvis25_pm_ops;
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int st_uvis25_probe(struct device *dev, int irq, struct regmap *regmap);
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#endif /* ST_UVIS25_H */
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359
drivers/iio/light/st_uvis25_core.c
Normal file
359
drivers/iio/light/st_uvis25_core.c
Normal file
@ -0,0 +1,359 @@
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/*
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* STMicroelectronics uvis25 sensor driver
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*
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* Copyright 2017 STMicroelectronics Inc.
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*
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* Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/iio/sysfs.h>
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#include <linux/delay.h>
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#include <linux/pm.h>
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#include <linux/interrupt.h>
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#include <linux/irqreturn.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/buffer.h>
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#include <linux/regmap.h>
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#include "st_uvis25.h"
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#define ST_UVIS25_REG_WHOAMI_ADDR 0x0f
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#define ST_UVIS25_REG_WHOAMI_VAL 0xca
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#define ST_UVIS25_REG_CTRL1_ADDR 0x20
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#define ST_UVIS25_REG_ODR_MASK BIT(0)
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#define ST_UVIS25_REG_BDU_MASK BIT(1)
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#define ST_UVIS25_REG_CTRL2_ADDR 0x21
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#define ST_UVIS25_REG_BOOT_MASK BIT(7)
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#define ST_UVIS25_REG_CTRL3_ADDR 0x22
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#define ST_UVIS25_REG_HL_MASK BIT(7)
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#define ST_UVIS25_REG_STATUS_ADDR 0x27
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#define ST_UVIS25_REG_UV_DA_MASK BIT(0)
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#define ST_UVIS25_REG_OUT_ADDR 0x28
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static const struct iio_chan_spec st_uvis25_channels[] = {
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{
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.type = IIO_UVINDEX,
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.address = ST_UVIS25_REG_OUT_ADDR,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
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.scan_index = 0,
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.scan_type = {
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.sign = 'u',
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.realbits = 8,
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.storagebits = 8,
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},
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},
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IIO_CHAN_SOFT_TIMESTAMP(1),
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};
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static int st_uvis25_check_whoami(struct st_uvis25_hw *hw)
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{
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int err, data;
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err = regmap_read(hw->regmap, ST_UVIS25_REG_WHOAMI_ADDR, &data);
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if (err < 0) {
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dev_err(regmap_get_device(hw->regmap),
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"failed to read whoami register\n");
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return err;
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}
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if (data != ST_UVIS25_REG_WHOAMI_VAL) {
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dev_err(regmap_get_device(hw->regmap),
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"wrong whoami {%02x vs %02x}\n",
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data, ST_UVIS25_REG_WHOAMI_VAL);
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return -ENODEV;
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}
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return 0;
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}
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static int st_uvis25_set_enable(struct st_uvis25_hw *hw, bool enable)
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{
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int err;
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err = regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL1_ADDR,
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ST_UVIS25_REG_ODR_MASK, enable);
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if (err < 0)
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return err;
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hw->enabled = enable;
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return 0;
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}
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static int st_uvis25_read_oneshot(struct st_uvis25_hw *hw, u8 addr, int *val)
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{
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int err;
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err = st_uvis25_set_enable(hw, true);
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if (err < 0)
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return err;
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msleep(1500);
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/*
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* in order to avoid possible race conditions with interrupt
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* generation, disable the sensor first and then poll output
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* register. That sequence guarantees the interrupt will be reset
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* when irq line is unmasked
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*/
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err = st_uvis25_set_enable(hw, false);
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if (err < 0)
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return err;
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err = regmap_read(hw->regmap, addr, val);
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return err < 0 ? err : IIO_VAL_INT;
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}
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static int st_uvis25_read_raw(struct iio_dev *iio_dev,
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struct iio_chan_spec const *ch,
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int *val, int *val2, long mask)
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{
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int ret;
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ret = iio_device_claim_direct_mode(iio_dev);
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if (ret)
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return ret;
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switch (mask) {
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case IIO_CHAN_INFO_PROCESSED: {
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struct st_uvis25_hw *hw = iio_priv(iio_dev);
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/*
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* mask irq line during oneshot read since the sensor
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* does not export the capability to disable data-ready line
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* in the register map and it is enabled by default.
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* If the line is unmasked during read_raw() it will be set
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* active and never reset since the trigger is disabled
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*/
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if (hw->irq > 0)
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disable_irq(hw->irq);
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ret = st_uvis25_read_oneshot(hw, ch->address, val);
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if (hw->irq > 0)
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enable_irq(hw->irq);
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break;
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}
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default:
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ret = -EINVAL;
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break;
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}
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iio_device_release_direct_mode(iio_dev);
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return ret;
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}
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static irqreturn_t st_uvis25_trigger_handler_thread(int irq, void *private)
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{
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struct st_uvis25_hw *hw = private;
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int err, status;
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err = regmap_read(hw->regmap, ST_UVIS25_REG_STATUS_ADDR, &status);
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if (err < 0)
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return IRQ_HANDLED;
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if (!(status & ST_UVIS25_REG_UV_DA_MASK))
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return IRQ_NONE;
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iio_trigger_poll_chained(hw->trig);
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return IRQ_HANDLED;
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}
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static int st_uvis25_allocate_trigger(struct iio_dev *iio_dev)
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{
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struct st_uvis25_hw *hw = iio_priv(iio_dev);
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struct device *dev = regmap_get_device(hw->regmap);
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bool irq_active_low = false;
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unsigned long irq_type;
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int err;
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irq_type = irqd_get_trigger_type(irq_get_irq_data(hw->irq));
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switch (irq_type) {
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case IRQF_TRIGGER_HIGH:
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case IRQF_TRIGGER_RISING:
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break;
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case IRQF_TRIGGER_LOW:
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case IRQF_TRIGGER_FALLING:
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irq_active_low = true;
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break;
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default:
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dev_info(dev, "mode %lx unsupported\n", irq_type);
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return -EINVAL;
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}
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err = regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL3_ADDR,
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ST_UVIS25_REG_HL_MASK, irq_active_low);
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if (err < 0)
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return err;
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err = devm_request_threaded_irq(dev, hw->irq, NULL,
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st_uvis25_trigger_handler_thread,
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irq_type | IRQF_ONESHOT,
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iio_dev->name, hw);
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if (err) {
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dev_err(dev, "failed to request trigger irq %d\n",
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hw->irq);
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return err;
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}
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hw->trig = devm_iio_trigger_alloc(dev, "%s-trigger",
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iio_dev->name);
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if (!hw->trig)
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return -ENOMEM;
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iio_trigger_set_drvdata(hw->trig, iio_dev);
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hw->trig->dev.parent = dev;
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return devm_iio_trigger_register(dev, hw->trig);
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}
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static int st_uvis25_buffer_preenable(struct iio_dev *iio_dev)
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{
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return st_uvis25_set_enable(iio_priv(iio_dev), true);
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}
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static int st_uvis25_buffer_postdisable(struct iio_dev *iio_dev)
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{
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return st_uvis25_set_enable(iio_priv(iio_dev), false);
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}
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static const struct iio_buffer_setup_ops st_uvis25_buffer_ops = {
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.preenable = st_uvis25_buffer_preenable,
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.postenable = iio_triggered_buffer_postenable,
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.predisable = iio_triggered_buffer_predisable,
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.postdisable = st_uvis25_buffer_postdisable,
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};
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static irqreturn_t st_uvis25_buffer_handler_thread(int irq, void *p)
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{
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u8 buffer[ALIGN(sizeof(u8), sizeof(s64)) + sizeof(s64)];
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struct iio_poll_func *pf = p;
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struct iio_dev *iio_dev = pf->indio_dev;
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struct st_uvis25_hw *hw = iio_priv(iio_dev);
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int err;
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err = regmap_read(hw->regmap, ST_UVIS25_REG_OUT_ADDR, (int *)buffer);
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if (err < 0)
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goto out;
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iio_push_to_buffers_with_timestamp(iio_dev, buffer,
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iio_get_time_ns(iio_dev));
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out:
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iio_trigger_notify_done(hw->trig);
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return IRQ_HANDLED;
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}
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static int st_uvis25_allocate_buffer(struct iio_dev *iio_dev)
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{
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struct st_uvis25_hw *hw = iio_priv(iio_dev);
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return devm_iio_triggered_buffer_setup(regmap_get_device(hw->regmap),
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iio_dev, NULL,
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st_uvis25_buffer_handler_thread,
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&st_uvis25_buffer_ops);
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}
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static const struct iio_info st_uvis25_info = {
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.read_raw = st_uvis25_read_raw,
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};
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static int st_uvis25_init_sensor(struct st_uvis25_hw *hw)
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{
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int err;
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err = regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL2_ADDR,
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ST_UVIS25_REG_BOOT_MASK, 1);
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if (err < 0)
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return err;
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msleep(2000);
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return regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL1_ADDR,
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ST_UVIS25_REG_BDU_MASK, 1);
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}
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int st_uvis25_probe(struct device *dev, int irq, struct regmap *regmap)
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{
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struct st_uvis25_hw *hw;
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struct iio_dev *iio_dev;
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int err;
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iio_dev = devm_iio_device_alloc(dev, sizeof(*hw));
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if (!iio_dev)
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return -ENOMEM;
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dev_set_drvdata(dev, (void *)iio_dev);
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hw = iio_priv(iio_dev);
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hw->irq = irq;
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hw->regmap = regmap;
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err = st_uvis25_check_whoami(hw);
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if (err < 0)
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return err;
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iio_dev->modes = INDIO_DIRECT_MODE;
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iio_dev->dev.parent = dev;
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iio_dev->channels = st_uvis25_channels;
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iio_dev->num_channels = ARRAY_SIZE(st_uvis25_channels);
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iio_dev->name = ST_UVIS25_DEV_NAME;
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iio_dev->info = &st_uvis25_info;
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err = st_uvis25_init_sensor(hw);
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if (err < 0)
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return err;
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if (hw->irq > 0) {
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err = st_uvis25_allocate_buffer(iio_dev);
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if (err < 0)
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return err;
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err = st_uvis25_allocate_trigger(iio_dev);
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if (err)
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return err;
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}
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return devm_iio_device_register(dev, iio_dev);
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}
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EXPORT_SYMBOL(st_uvis25_probe);
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static int __maybe_unused st_uvis25_suspend(struct device *dev)
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{
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struct iio_dev *iio_dev = dev_get_drvdata(dev);
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struct st_uvis25_hw *hw = iio_priv(iio_dev);
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return regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL1_ADDR,
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ST_UVIS25_REG_ODR_MASK, 0);
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}
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static int __maybe_unused st_uvis25_resume(struct device *dev)
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{
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struct iio_dev *iio_dev = dev_get_drvdata(dev);
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struct st_uvis25_hw *hw = iio_priv(iio_dev);
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if (hw->enabled)
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return regmap_update_bits(hw->regmap, ST_UVIS25_REG_CTRL1_ADDR,
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ST_UVIS25_REG_ODR_MASK, 1);
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return 0;
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}
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const struct dev_pm_ops st_uvis25_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(st_uvis25_suspend, st_uvis25_resume)
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};
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EXPORT_SYMBOL(st_uvis25_pm_ops);
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MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>");
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MODULE_DESCRIPTION("STMicroelectronics uvis25 sensor driver");
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MODULE_LICENSE("GPL v2");
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69
drivers/iio/light/st_uvis25_i2c.c
Normal file
69
drivers/iio/light/st_uvis25_i2c.c
Normal file
@ -0,0 +1,69 @@
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/*
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* STMicroelectronics uvis25 i2c driver
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*
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* Copyright 2017 STMicroelectronics Inc.
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*
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* Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/acpi.h>
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#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");
|
||||
68
drivers/iio/light/st_uvis25_spi.c
Normal file
68
drivers/iio/light/st_uvis25_spi.c
Normal file
@ -0,0 +1,68 @@
|
||||
/*
|
||||
* STMicroelectronics uvis25 spi 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/spi/spi.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/regmap.h>
|
||||
|
||||
#include "st_uvis25.h"
|
||||
|
||||
#define UVIS25_SENSORS_SPI_READ BIT(7)
|
||||
#define UVIS25_SPI_AUTO_INCREMENT BIT(6)
|
||||
|
||||
const struct regmap_config st_uvis25_spi_regmap_config = {
|
||||
.reg_bits = 8,
|
||||
.val_bits = 8,
|
||||
.read_flag_mask = UVIS25_SENSORS_SPI_READ | UVIS25_SPI_AUTO_INCREMENT,
|
||||
.write_flag_mask = UVIS25_SPI_AUTO_INCREMENT,
|
||||
};
|
||||
|
||||
static int st_uvis25_spi_probe(struct spi_device *spi)
|
||||
{
|
||||
struct regmap *regmap;
|
||||
|
||||
regmap = devm_regmap_init_spi(spi, &st_uvis25_spi_regmap_config);
|
||||
if (IS_ERR(regmap)) {
|
||||
dev_err(&spi->dev, "Failed to register spi regmap %d\n",
|
||||
(int)PTR_ERR(regmap));
|
||||
return PTR_ERR(regmap);
|
||||
}
|
||||
|
||||
return st_uvis25_probe(&spi->dev, spi->irq, regmap);
|
||||
}
|
||||
|
||||
static const struct of_device_id st_uvis25_spi_of_match[] = {
|
||||
{ .compatible = "st,uvis25", },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, st_uvis25_spi_of_match);
|
||||
|
||||
static const struct spi_device_id st_uvis25_spi_id_table[] = {
|
||||
{ ST_UVIS25_DEV_NAME },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(spi, st_uvis25_spi_id_table);
|
||||
|
||||
static struct spi_driver st_uvis25_driver = {
|
||||
.driver = {
|
||||
.name = "st_uvis25_spi",
|
||||
.pm = &st_uvis25_pm_ops,
|
||||
.of_match_table = of_match_ptr(st_uvis25_spi_of_match),
|
||||
},
|
||||
.probe = st_uvis25_spi_probe,
|
||||
.id_table = st_uvis25_spi_id_table,
|
||||
};
|
||||
module_spi_driver(st_uvis25_driver);
|
||||
|
||||
MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>");
|
||||
MODULE_DESCRIPTION("STMicroelectronics uvis25 spi driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user