iio: light: Add support for ROHM RPR0521 sensor
This patch adds support for ROHM RPR0521 ambient light and proximity sensor. It offers raw readings for intensity and proximity. Signed-off-by: Daniel Baluta <daniel.baluta@intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Daniel Baluta
Jonathan Cameron
Родитель
da8ef4e77d
Коммит
efa86e9fa8
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@ -168,6 +168,17 @@ config JSA1212
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To compile this driver as a module, choose M here:
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the module will be called jsa1212.
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config RPR0521
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tristate "ROHM RPR0521 ALS and proximity sensor driver"
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depends on I2C
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select REGMAP_I2C
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help
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Say Y here if you want to build support for ROHM's RPR0521
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ambient light and proximity sensor device.
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To compile this driver as a module, choose M here:
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the module will be called rpr0521.
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config SENSORS_LM3533
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tristate "LM3533 ambient light sensor"
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depends on MFD_LM3533
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@ -19,6 +19,7 @@ obj-$(CONFIG_ISL29125) += isl29125.o
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obj-$(CONFIG_JSA1212) += jsa1212.o
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obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o
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obj-$(CONFIG_LTR501) += ltr501.o
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obj-$(CONFIG_RPR0521) += rpr0521.o
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obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o
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obj-$(CONFIG_STK3310) += stk3310.o
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obj-$(CONFIG_TCS3414) += tcs3414.o
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@ -0,0 +1,615 @@
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/*
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* RPR-0521 ROHM Ambient Light and Proximity Sensor
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*
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* Copyright (c) 2015, Intel Corporation.
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*
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* IIO driver for RPR-0521RS (7-bit I2C slave address 0x38).
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*
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* TODO: illuminance channel, PM support, buffer
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/regmap.h>
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#include <linux/delay.h>
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#include <linux/acpi.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/pm_runtime.h>
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#define RPR0521_REG_SYSTEM_CTRL 0x40
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#define RPR0521_REG_MODE_CTRL 0x41
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#define RPR0521_REG_ALS_CTRL 0x42
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#define RPR0521_REG_PXS_CTRL 0x43
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#define RPR0521_REG_PXS_DATA 0x44 /* 16-bit, little endian */
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#define RPR0521_REG_ALS_DATA0 0x46 /* 16-bit, little endian */
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#define RPR0521_REG_ALS_DATA1 0x48 /* 16-bit, little endian */
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#define RPR0521_REG_ID 0x92
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#define RPR0521_MODE_ALS_MASK BIT(7)
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#define RPR0521_MODE_PXS_MASK BIT(6)
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#define RPR0521_MODE_MEAS_TIME_MASK GENMASK(3, 0)
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#define RPR0521_ALS_DATA0_GAIN_MASK GENMASK(5, 4)
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#define RPR0521_ALS_DATA0_GAIN_SHIFT 4
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#define RPR0521_ALS_DATA1_GAIN_MASK GENMASK(3, 2)
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#define RPR0521_ALS_DATA1_GAIN_SHIFT 2
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#define RPR0521_PXS_GAIN_MASK GENMASK(5, 4)
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#define RPR0521_PXS_GAIN_SHIFT 4
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#define RPR0521_MODE_ALS_ENABLE BIT(7)
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#define RPR0521_MODE_ALS_DISABLE 0x00
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#define RPR0521_MODE_PXS_ENABLE BIT(6)
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#define RPR0521_MODE_PXS_DISABLE 0x00
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#define RPR0521_MANUFACT_ID 0xE0
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#define RPR0521_DEFAULT_MEAS_TIME 0x06 /* ALS - 100ms, PXS - 100ms */
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#define RPR0521_DRV_NAME "RPR0521"
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#define RPR0521_REGMAP_NAME "rpr0521_regmap"
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#define RPR0521_SLEEP_DELAY_MS 2000
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#define RPR0521_ALS_SCALE_AVAIL "0.007812 0.015625 0.5 1"
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#define RPR0521_PXS_SCALE_AVAIL "0.125 0.5 1"
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struct rpr0521_gain {
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int scale;
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int uscale;
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};
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static const struct rpr0521_gain rpr0521_als_gain[4] = {
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{1, 0}, /* x1 */
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{0, 500000}, /* x2 */
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{0, 15625}, /* x64 */
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{0, 7812}, /* x128 */
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};
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static const struct rpr0521_gain rpr0521_pxs_gain[3] = {
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{1, 0}, /* x1 */
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{0, 500000}, /* x2 */
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{0, 125000}, /* x4 */
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};
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enum rpr0521_channel {
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RPR0521_CHAN_ALS_DATA0,
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RPR0521_CHAN_ALS_DATA1,
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RPR0521_CHAN_PXS,
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};
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struct rpr0521_reg_desc {
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u8 address;
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u8 device_mask;
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};
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static const struct rpr0521_reg_desc rpr0521_data_reg[] = {
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[RPR0521_CHAN_ALS_DATA0] = {
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.address = RPR0521_REG_ALS_DATA0,
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.device_mask = RPR0521_MODE_ALS_MASK,
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},
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[RPR0521_CHAN_ALS_DATA1] = {
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.address = RPR0521_REG_ALS_DATA1,
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.device_mask = RPR0521_MODE_ALS_MASK,
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},
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[RPR0521_CHAN_PXS] = {
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.address = RPR0521_REG_PXS_DATA,
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.device_mask = RPR0521_MODE_PXS_MASK,
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},
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};
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static const struct rpr0521_gain_info {
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u8 reg;
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u8 mask;
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u8 shift;
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const struct rpr0521_gain *gain;
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int size;
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} rpr0521_gain[] = {
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[RPR0521_CHAN_ALS_DATA0] = {
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.reg = RPR0521_REG_ALS_CTRL,
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.mask = RPR0521_ALS_DATA0_GAIN_MASK,
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.shift = RPR0521_ALS_DATA0_GAIN_SHIFT,
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.gain = rpr0521_als_gain,
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.size = ARRAY_SIZE(rpr0521_als_gain),
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},
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[RPR0521_CHAN_ALS_DATA1] = {
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.reg = RPR0521_REG_ALS_CTRL,
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.mask = RPR0521_ALS_DATA1_GAIN_MASK,
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.shift = RPR0521_ALS_DATA1_GAIN_SHIFT,
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.gain = rpr0521_als_gain,
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.size = ARRAY_SIZE(rpr0521_als_gain),
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},
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[RPR0521_CHAN_PXS] = {
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.reg = RPR0521_REG_PXS_CTRL,
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.mask = RPR0521_PXS_GAIN_MASK,
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.shift = RPR0521_PXS_GAIN_SHIFT,
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.gain = rpr0521_pxs_gain,
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.size = ARRAY_SIZE(rpr0521_pxs_gain),
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},
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};
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struct rpr0521_data {
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struct i2c_client *client;
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/* protect device params updates (e.g state, gain) */
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struct mutex lock;
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/* device active status */
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bool als_dev_en;
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bool pxs_dev_en;
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/* optimize runtime pm ops - enable device only if needed */
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bool als_ps_need_en;
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bool pxs_ps_need_en;
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struct regmap *regmap;
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};
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static IIO_CONST_ATTR(in_intensity_scale_available, RPR0521_ALS_SCALE_AVAIL);
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static IIO_CONST_ATTR(in_proximity_scale_available, RPR0521_PXS_SCALE_AVAIL);
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static struct attribute *rpr0521_attributes[] = {
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&iio_const_attr_in_intensity_scale_available.dev_attr.attr,
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&iio_const_attr_in_proximity_scale_available.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group rpr0521_attribute_group = {
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.attrs = rpr0521_attributes,
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};
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static const struct iio_chan_spec rpr0521_channels[] = {
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{
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.type = IIO_INTENSITY,
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.modified = 1,
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.address = RPR0521_CHAN_ALS_DATA0,
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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_SCALE),
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},
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{
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.type = IIO_INTENSITY,
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.modified = 1,
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.address = RPR0521_CHAN_ALS_DATA1,
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.channel2 = IIO_MOD_LIGHT_IR,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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},
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{
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.type = IIO_PROXIMITY,
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.address = RPR0521_CHAN_PXS,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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}
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};
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static int rpr0521_als_enable(struct rpr0521_data *data, u8 status)
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{
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int ret;
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ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
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RPR0521_MODE_ALS_MASK,
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status);
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if (ret < 0)
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return ret;
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data->als_dev_en = true;
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return 0;
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}
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static int rpr0521_pxs_enable(struct rpr0521_data *data, u8 status)
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{
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int ret;
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ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
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RPR0521_MODE_PXS_MASK,
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status);
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if (ret < 0)
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return ret;
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data->pxs_dev_en = true;
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return 0;
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}
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/**
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* rpr0521_set_power_state - handles runtime PM state and sensors enabled status
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*
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* @data: rpr0521 device private data
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* @on: state to be set for devices in @device_mask
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* @device_mask: bitmask specifying for which device we need to update @on state
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*
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* We rely on rpr0521_runtime_resume to enable our @device_mask devices, but
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* if (for example) PXS was enabled (pxs_dev_en = true) by a previous call to
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* rpr0521_runtime_resume and we want to enable ALS we MUST set ALS enable
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* bit of RPR0521_REG_MODE_CTRL here because rpr0521_runtime_resume will not
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* be called twice.
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*/
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static int rpr0521_set_power_state(struct rpr0521_data *data, bool on,
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u8 device_mask)
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{
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#ifdef CONFIG_PM
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int ret;
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u8 update_mask = 0;
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if (device_mask & RPR0521_MODE_ALS_MASK) {
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if (on && !data->als_ps_need_en && data->pxs_dev_en)
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update_mask |= RPR0521_MODE_ALS_MASK;
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else
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data->als_ps_need_en = on;
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}
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if (device_mask & RPR0521_MODE_PXS_MASK) {
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if (on && !data->pxs_ps_need_en && data->als_dev_en)
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update_mask |= RPR0521_MODE_PXS_MASK;
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else
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data->pxs_ps_need_en = on;
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}
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if (update_mask) {
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ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
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update_mask, update_mask);
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if (ret < 0)
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return ret;
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}
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if (on) {
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ret = pm_runtime_get_sync(&data->client->dev);
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} else {
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pm_runtime_mark_last_busy(&data->client->dev);
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ret = pm_runtime_put_autosuspend(&data->client->dev);
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}
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if (ret < 0) {
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dev_err(&data->client->dev,
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"Failed: rpr0521_set_power_state for %d, ret %d\n",
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on, ret);
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if (on)
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pm_runtime_put_noidle(&data->client->dev);
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return ret;
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}
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#endif
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return 0;
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}
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static int rpr0521_get_gain(struct rpr0521_data *data, int chan,
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int *val, int *val2)
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{
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int ret, reg, idx;
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ret = regmap_read(data->regmap, rpr0521_gain[chan].reg, ®);
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if (ret < 0)
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return ret;
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idx = (rpr0521_gain[chan].mask & reg) >> rpr0521_gain[chan].shift;
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*val = rpr0521_gain[chan].gain[idx].scale;
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*val2 = rpr0521_gain[chan].gain[idx].uscale;
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return 0;
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}
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static int rpr0521_set_gain(struct rpr0521_data *data, int chan,
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int val, int val2)
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{
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int i, idx = -EINVAL;
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/* get gain index */
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for (i = 0; i < rpr0521_gain[chan].size; i++)
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if (val == rpr0521_gain[chan].gain[i].scale &&
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val2 == rpr0521_gain[chan].gain[i].uscale) {
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idx = i;
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break;
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}
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if (idx < 0)
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return idx;
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return regmap_update_bits(data->regmap, rpr0521_gain[chan].reg,
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rpr0521_gain[chan].mask,
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idx << rpr0521_gain[chan].shift);
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}
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static int rpr0521_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int *val,
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int *val2, long mask)
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{
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struct rpr0521_data *data = iio_priv(indio_dev);
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int ret;
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u8 device_mask;
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__le16 raw_data;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (chan->type != IIO_INTENSITY && chan->type != IIO_PROXIMITY)
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return -EINVAL;
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device_mask = rpr0521_data_reg[chan->address].device_mask;
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mutex_lock(&data->lock);
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ret = rpr0521_set_power_state(data, true, device_mask);
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if (ret < 0) {
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mutex_unlock(&data->lock);
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return ret;
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}
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ret = regmap_bulk_read(data->regmap,
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rpr0521_data_reg[chan->address].address,
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&raw_data, 2);
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if (ret < 0) {
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rpr0521_set_power_state(data, false, device_mask);
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mutex_unlock(&data->lock);
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return ret;
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}
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ret = rpr0521_set_power_state(data, false, device_mask);
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mutex_unlock(&data->lock);
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if (ret < 0)
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return ret;
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*val = le16_to_cpu(raw_data);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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mutex_lock(&data->lock);
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ret = rpr0521_get_gain(data, chan->address, val, val2);
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mutex_unlock(&data->lock);
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if (ret < 0)
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return ret;
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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}
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}
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static int rpr0521_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int val,
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int val2, long mask)
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{
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struct rpr0521_data *data = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_SCALE:
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mutex_lock(&data->lock);
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ret = rpr0521_set_gain(data, chan->address, val, val2);
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mutex_unlock(&data->lock);
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return ret;
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info rpr0521_info = {
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.driver_module = THIS_MODULE,
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.read_raw = rpr0521_read_raw,
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.write_raw = rpr0521_write_raw,
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.attrs = &rpr0521_attribute_group,
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};
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static int rpr0521_init(struct rpr0521_data *data)
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{
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int ret;
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int id;
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ret = regmap_read(data->regmap, RPR0521_REG_ID, &id);
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if (ret < 0) {
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dev_err(&data->client->dev, "Failed to read REG_ID register\n");
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return ret;
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}
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if (id != RPR0521_MANUFACT_ID) {
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dev_err(&data->client->dev, "Wrong id, got %x, expected %x\n",
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id, RPR0521_MANUFACT_ID);
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return -ENODEV;
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}
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/* set default measurement time - 100 ms for both ALS and PS */
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ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
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RPR0521_MODE_MEAS_TIME_MASK,
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RPR0521_DEFAULT_MEAS_TIME);
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if (ret) {
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pr_err("regmap_update_bits returned %d\n", ret);
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return ret;
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||||
}
|
||||
|
||||
ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int rpr0521_poweroff(struct rpr0521_data *data)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = regmap_update_bits(data->regmap, RPR0521_REG_MODE_CTRL,
|
||||
RPR0521_MODE_ALS_MASK |
|
||||
RPR0521_MODE_PXS_MASK,
|
||||
RPR0521_MODE_ALS_DISABLE |
|
||||
RPR0521_MODE_PXS_DISABLE);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
data->als_dev_en = false;
|
||||
data->pxs_dev_en = false;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static bool rpr0521_is_volatile_reg(struct device *dev, unsigned int reg)
|
||||
{
|
||||
switch (reg) {
|
||||
case RPR0521_REG_MODE_CTRL:
|
||||
case RPR0521_REG_ALS_CTRL:
|
||||
case RPR0521_REG_PXS_CTRL:
|
||||
return false;
|
||||
default:
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
static const struct regmap_config rpr0521_regmap_config = {
|
||||
.name = RPR0521_REGMAP_NAME,
|
||||
|
||||
.reg_bits = 8,
|
||||
.val_bits = 8,
|
||||
|
||||
.max_register = RPR0521_REG_ID,
|
||||
.cache_type = REGCACHE_RBTREE,
|
||||
.volatile_reg = rpr0521_is_volatile_reg,
|
||||
};
|
||||
|
||||
static int rpr0521_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct rpr0521_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, &rpr0521_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;
|
||||
|
||||
mutex_init(&data->lock);
|
||||
|
||||
indio_dev->dev.parent = &client->dev;
|
||||
indio_dev->info = &rpr0521_info;
|
||||
indio_dev->name = RPR0521_DRV_NAME;
|
||||
indio_dev->channels = rpr0521_channels;
|
||||
indio_dev->num_channels = ARRAY_SIZE(rpr0521_channels);
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
|
||||
ret = rpr0521_init(data);
|
||||
if (ret < 0) {
|
||||
dev_err(&client->dev, "rpr0521 chip init failed\n");
|
||||
return ret;
|
||||
}
|
||||
ret = iio_device_register(indio_dev);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = pm_runtime_set_active(&client->dev);
|
||||
if (ret < 0)
|
||||
goto err_iio_unregister;
|
||||
|
||||
pm_runtime_enable(&client->dev);
|
||||
pm_runtime_set_autosuspend_delay(&client->dev, RPR0521_SLEEP_DELAY_MS);
|
||||
pm_runtime_use_autosuspend(&client->dev);
|
||||
|
||||
return 0;
|
||||
|
||||
err_iio_unregister:
|
||||
iio_device_unregister(indio_dev);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int rpr0521_remove(struct i2c_client *client)
|
||||
{
|
||||
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
||||
|
||||
pm_runtime_disable(&client->dev);
|
||||
pm_runtime_set_suspended(&client->dev);
|
||||
pm_runtime_put_noidle(&client->dev);
|
||||
|
||||
iio_device_unregister(indio_dev);
|
||||
rpr0521_poweroff(iio_priv(indio_dev));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
static int rpr0521_runtime_suspend(struct device *dev)
|
||||
{
|
||||
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
|
||||
struct rpr0521_data *data = iio_priv(indio_dev);
|
||||
int ret;
|
||||
|
||||
/* disable channels and sets {als,pxs}_dev_en to false */
|
||||
mutex_lock(&data->lock);
|
||||
ret = rpr0521_poweroff(data);
|
||||
mutex_unlock(&data->lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int rpr0521_runtime_resume(struct device *dev)
|
||||
{
|
||||
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
|
||||
struct rpr0521_data *data = iio_priv(indio_dev);
|
||||
int ret;
|
||||
|
||||
if (data->als_ps_need_en) {
|
||||
ret = rpr0521_als_enable(data, RPR0521_MODE_ALS_ENABLE);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
data->als_ps_need_en = false;
|
||||
}
|
||||
|
||||
if (data->pxs_ps_need_en) {
|
||||
ret = rpr0521_pxs_enable(data, RPR0521_MODE_PXS_ENABLE);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
data->pxs_ps_need_en = false;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
static const struct dev_pm_ops rpr0521_pm_ops = {
|
||||
SET_RUNTIME_PM_OPS(rpr0521_runtime_suspend,
|
||||
rpr0521_runtime_resume, NULL)
|
||||
};
|
||||
|
||||
static const struct acpi_device_id rpr0521_acpi_match[] = {
|
||||
{"RPR0521", 0},
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(acpi, rpr0521_acpi_match);
|
||||
|
||||
static const struct i2c_device_id rpr0521_id[] = {
|
||||
{"rpr0521", 0},
|
||||
{ }
|
||||
};
|
||||
|
||||
MODULE_DEVICE_TABLE(i2c, rpr0521_id);
|
||||
|
||||
static struct i2c_driver rpr0521_driver = {
|
||||
.driver = {
|
||||
.name = RPR0521_DRV_NAME,
|
||||
.pm = &rpr0521_pm_ops,
|
||||
.acpi_match_table = ACPI_PTR(rpr0521_acpi_match),
|
||||
},
|
||||
.probe = rpr0521_probe,
|
||||
.remove = rpr0521_remove,
|
||||
.id_table = rpr0521_id,
|
||||
};
|
||||
|
||||
module_i2c_driver(rpr0521_driver);
|
||||
|
||||
MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
|
||||
MODULE_DESCRIPTION("RPR0521 ROHM Ambient Light and Proximity Sensor driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
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