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Message-ID: <CAHp75Vdmg_hf0VbQXshWSfRuBRo7LgP8J5pM7iKhjBu0ON0qQA@mail.gmail.com>
Date: Thu, 14 Jul 2022 15:06:57 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Shreeya Patel <shreeya.patel@...labora.com>
Cc: Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>,
Rob Herring <robh+dt@...nel.org>,
Dmitry Osipenko <dmitry.osipenko@...labora.com>,
Zhigang.Shi@...eon.com, krisman@...labora.com,
linux-iio <linux-iio@...r.kernel.org>,
devicetree <devicetree@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Collabora Kernel ML <kernel@...labora.com>,
alvaro.soliverez@...labora.com
Subject: Re: [PATCH v8 2/2] iio: light: Add support for ltrf216a sensor
On Thu, Jul 14, 2022 at 11:14 AM Shreeya Patel
<shreeya.patel@...labora.com> wrote:
>
> Add initial support for ltrf216a ambient light sensor.
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Datasheet: https://gitlab.steamos.cloud/shreeya/iio/-/blob/main/LTRF216A.pdf
> Co-developed-by: Zhigang Shi <Zhigang.Shi@...eon.com>
> Signed-off-by: Zhigang Shi <Zhigang.Shi@...eon.com>
> Co-developed-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
> Signed-off-by: Shreeya Patel <shreeya.patel@...labora.com>
> ---
>
> Note :-
>
> This patch generates the below mentioned warnings due to not documenting
> the 'ltr' string in vendors-prefix.yaml and liteon,ltrf216a.yaml files.
> The thread for the discussion of not documenting 'ltr' as deprecated
> prefix can be found here.
> https://lore.kernel.org/lkml/20220511094024.175994-2-shreeya.patel@collabora.com/
>
> There are released devices which uses ltr216a light sensor and exposes the
> vendor prefix name as 'ltr' through ACPI. Hence, we would like to add
> this string under compatible property which would help probe the light sensor
> driver.
>
> WARNING: DT compatible string "ltr,ltrf216a" appears un-documented
> -- check ./Documentation/devicetree/bindings/
> #474: FILE: drivers/iio/light/ltrf216a.c:421:
> + { .compatible = "ltr,ltrf216a", },
>
> WARNING: DT compatible string vendor "ltr" appears un-documented
> -- check ./Documentation/devicetree/bindings/vendor-prefixes.yaml
> #474: FILE: drivers/iio/light/ltrf216a.c:421:
> + { .compatible = "ltr,ltrf216a", },
>
> Changes in v8
> - Add caching mechanism to restore register state after h/w resume.
> - Add callback functions and disable locking in regmap config.
> - Update mutex comment as per it's current scope in the driver.
> - Add Shreeya as author of the driver.
> - Make some minor cleanups.
>
> Changes in v7
> - Add regmap support.
> - Fix runtime power management implementation.
> - Fix the ordering of devm and non-devm functions.
> - Use DEFINE_RUNTIME_DEV_PM_OPS macro
>
> Changes in v6
> - Fix some errors reported by kernel test robot.
> - Add protocol details for the datasheet link.
> - Remove useless assignments.
> - Add unit details for read data delay macro.
> - Use pm_sleep_ptr().
>
> Changes in v5
> - Add power management support.
> - Add reset functionality.
> - Use readx_poll_timeout() to get data.
> - Cleanup some of the redundant code.
> - Update int_time_fac after I2C write is successful.
> - Rename mutex to lock.
> - Use Reverse Xmas tree pattern for all variable definitions.
> - Improve error handling messages and add error codes.
> - Add one more MODULE_AUTHOR.
> - Remove cleardata which was reading data for infrared light.
>
> Changes in v4
> - Add more descriptive comment for mutex lock
> - Fix mutex locking in read_raw()
> - Use i2c_smbus_read_i2c_block_data()
>
> Changes in v3
> - Use u16 instead of u8 for int_time_fac
> - Reorder headers in ltrf216a.c file
> - Remove int_time_mapping table and use int_time_available
>
> Changes in v2
> - Add support for 25ms and 50ms integration time.
> - Rename some of the macros as per names given in datasheet
> - Add a comment for the mutex lock
> - Use read_avail callback instead of attributes and set the
> appropriate _available bit.
> - Use FIELD_PREP() at appropriate places.
> - Add a constant lookup table for integration time and reg val
> - Use BIT() macro for magic numbers.
> - Improve error handling at few places.
> - Use get_unaligned_le24() and div_u64()
> - Use probe_new() callback and devm functions
> - Return errors in probe using dev_err_probe()
> - Use DEFINE_SIMPLE_DEV_PM_OPS()
> - Correct the formula for lux to use 0.45 instead of 0.8
>
>
> drivers/iio/light/Kconfig | 11 +
> drivers/iio/light/Makefile | 1 +
> drivers/iio/light/ltrf216a.c | 522 +++++++++++++++++++++++++++++++++++
> 3 files changed, 534 insertions(+)
> create mode 100644 drivers/iio/light/ltrf216a.c
>
> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
> index 8537e88f02e3..7cf6e8490123 100644
> --- a/drivers/iio/light/Kconfig
> +++ b/drivers/iio/light/Kconfig
> @@ -331,6 +331,17 @@ config LTR501
> This driver can also be built as a module. If so, the module
> will be called ltr501.
>
> +config LTRF216A
> + tristate "Liteon LTRF216A Light Sensor"
> + depends on I2C
> + select REGMAP_I2C
> + help
> + If you say Y or M here, you get support for Liteon LTRF216A
> + Ambient Light Sensor.
> +
> + If built as a dynamically linked module, it will be called
> + ltrf216a.
> +
> config LV0104CS
> tristate "LV0104CS Ambient Light Sensor"
> depends on I2C
> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
> index d10912faf964..6f23817fae6f 100644
> --- a/drivers/iio/light/Makefile
> +++ b/drivers/iio/light/Makefile
> @@ -31,6 +31,7 @@ obj-$(CONFIG_ISL29125) += isl29125.o
> obj-$(CONFIG_JSA1212) += jsa1212.o
> obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o
> obj-$(CONFIG_LTR501) += ltr501.o
> +obj-$(CONFIG_LTRF216A) += ltrf216a.o
> obj-$(CONFIG_LV0104CS) += lv0104cs.o
> obj-$(CONFIG_MAX44000) += max44000.o
> obj-$(CONFIG_MAX44009) += max44009.o
> diff --git a/drivers/iio/light/ltrf216a.c b/drivers/iio/light/ltrf216a.c
> new file mode 100644
> index 000000000000..fd0c5dd5ffa0
> --- /dev/null
> +++ b/drivers/iio/light/ltrf216a.c
> @@ -0,0 +1,522 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * LTRF216A Ambient Light Sensor
> + *
> + * Copyright (C) 2022 Collabora, Ltd.
> + * Author: Shreeya Patel <shreeya.patel@...labora.com>
> + *
> + * Copyright (C) 2021 Lite-On Technology Corp (Singapore)
> + * Author: Shi Zhigang <Zhigang.Shi@...eon.com>
> + *
> + * IIO driver for LTRF216A (7-bit I2C slave address 0x53).
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/bits.h>
> +#include <linux/delay.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/iopoll.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/pm.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
> +
> +#include <linux/iio/iio.h>
> +
> +#include <asm/unaligned.h>
> +
> +#define LTRF216A_ALS_RESET_MASK BIT(4)
> +#define LTRF216A_ALS_DATA_STATUS BIT(3)
> +#define LTRF216A_ALS_ENABLE_MASK BIT(1)
> +#define LTRF216A_MAIN_CTRL 0x00
> +#define LTRF216A_ALS_MEAS_RES 0x04
> +#define LTRF216A_ALS_GAIN 0x05
> +#define LTRF216A_PART_ID 0x06
> +#define LTRF216A_MAIN_STATUS 0x07
> +#define LTRF216A_ALS_CLEAR_DATA_0 0x0a
> +#define LTRF216A_ALS_CLEAR_DATA_1 0x0b
> +#define LTRF216A_ALS_CLEAR_DATA_2 0x0c
> +#define LTRF216A_ALS_DATA_0 0x0d
> +#define LTRF216A_ALS_DATA_1 0x0e
> +#define LTRF216A_ALS_DATA_2 0x0f
> +#define LTRF216A_INT_CFG 0x19
> +#define LTRF216A_INT_PST 0x1a
> +#define LTRF216A_ALS_THRES_UP_0 0x21
> +#define LTRF216A_ALS_THRES_UP_1 0x22
> +#define LTRF216A_ALS_THRES_UP_2 0x23
> +#define LTRF216A_ALS_THRES_LOW_0 0x24
> +#define LTRF216A_ALS_THRES_LOW_1 0x25
> +#define LTRF216A_ALS_THRES_LOW_2 0x26
> +#define LTRF216A_ALS_READ_DATA_DELAY_US 20000
> +
> +static const int ltrf216a_int_time_available[][2] = {
> + { 0, 400000 },
> + { 0, 200000 },
> + { 0, 100000 },
> + { 0, 50000 },
> + { 0, 25000 },
> +};
> +
> +static const int ltrf216a_int_time_reg[][2] = {
> + { 400, 0x03 },
> + { 200, 0x13 },
> + { 100, 0x22 },
> + { 50, 0x31 },
> + { 25, 0x40 },
> +};
> +
> +/*
> + * Window Factor is needed when the device is under Window glass
> + * with coated tinted ink. This is to compensate for the light loss
> + * due to the lower transmission rate of the window glass and helps
> + * in calculating lux.
> + */
> +#define LTRF216A_WIN_FAC 1
> +
> +struct ltrf216a_data {
> + struct regmap *regmap;
> + struct i2c_client *client;
> + u32 int_time;
> + u16 int_time_fac;
> + u8 als_gain_fac;
> + /*
> + * Protects regmap accesses and makes sure integration time
> + * remains constant during the measurement of lux.
> + */
> + struct mutex lock;
> +};
> +
> +static const struct iio_chan_spec ltrf216a_channels[] = {
> + {
> + .type = IIO_LIGHT,
> + .info_mask_separate =
> + BIT(IIO_CHAN_INFO_PROCESSED) |
> + BIT(IIO_CHAN_INFO_INT_TIME),
> + .info_mask_separate_available =
> + BIT(IIO_CHAN_INFO_INT_TIME),
> + },
> +};
> +
> +static void ltrf216a_reset(struct iio_dev *indio_dev)
> +{
> + struct ltrf216a_data *data = iio_priv(indio_dev);
> +
> + /* reset sensor, chip fails to respond to this, so ignore any errors */
> + regmap_write(data->regmap, LTRF216A_MAIN_CTRL, LTRF216A_ALS_RESET_MASK);
> +
> + /* reset time */
> + usleep_range(1000, 2000);
> +}
> +
> +static int ltrf216a_enable(struct iio_dev *indio_dev)
> +{
> + struct ltrf216a_data *data = iio_priv(indio_dev);
> + struct device *dev = &data->client->dev;
> + int ret;
> +
> + /* enable sensor */
> + ret = regmap_set_bits(data->regmap,
> + LTRF216A_MAIN_CTRL, LTRF216A_ALS_ENABLE_MASK);
> + if (ret) {
> + dev_err(dev, "failed to enable sensor: %d\n", ret);
> + return ret;
> + }
> +
> + /* sleep for one integration cycle after enabling the device */
> + msleep(ltrf216a_int_time_reg[0][0]);
> +
> + return 0;
> +}
> +
> +static int ltrf216a_disable(struct iio_dev *indio_dev)
> +{
> + struct ltrf216a_data *data = iio_priv(indio_dev);
> + struct device *dev = &data->client->dev;
> + int ret;
> +
> + ret = regmap_write(data->regmap, LTRF216A_MAIN_CTRL, 0);
> + if (ret)
> + dev_err(dev, "failed to disable sensor: %d\n", ret);
> +
> + return ret;
> +}
> +
> +static int ltrf216a_set_int_time(struct ltrf216a_data *data, int itime)
> +{
> + struct device *dev = &data->client->dev;
> + unsigned int i;
> + u8 reg_val;
> + int ret;
> +
> + for (i = 0; i < ARRAY_SIZE(ltrf216a_int_time_available); i++) {
> + if (ltrf216a_int_time_available[i][1] == itime)
> + break;
> + }
> + if (i == ARRAY_SIZE(ltrf216a_int_time_available))
> + return -EINVAL;
> +
> + reg_val = ltrf216a_int_time_reg[i][1];
> +
> + ret = regmap_write(data->regmap, LTRF216A_ALS_MEAS_RES, reg_val);
> + if (ret) {
> + dev_err(dev, "failed to set integration time: %d\n", ret);
> + return ret;
> + }
> +
> + data->int_time_fac = ltrf216a_int_time_reg[i][0];
> + data->int_time = itime;
> +
> + return 0;
> +}
> +
> +static int ltrf216a_get_int_time(struct ltrf216a_data *data,
> + int *val, int *val2)
> +{
> + *val = 0;
> + *val2 = data->int_time;
> + return IIO_VAL_INT_PLUS_MICRO;
> +}
> +
> +static int ltrf216a_set_power_state(struct ltrf216a_data *data, bool on)
> +{
> + struct device *dev = &data->client->dev;
> + int ret;
> +
> + if (on) {
> + ret = pm_runtime_resume_and_get(dev);
> + if (ret) {
> + dev_err(dev, "failed to resume runtime PM: %d\n", ret);
> + return ret;
> + }
> + } else {
> + pm_runtime_mark_last_busy(dev);
> + pm_runtime_put_autosuspend(dev);
> + }
> +
> + return ret;
> +}
> +
> +static int ltrf216a_read_data(struct ltrf216a_data *data, u8 addr)
> +{
> + struct device *dev = &data->client->dev;
> + int ret, val;
> + u8 buf[3];
> +
> + ret = regmap_read_poll_timeout(data->regmap, LTRF216A_MAIN_STATUS,
> + val, val & LTRF216A_ALS_DATA_STATUS,
> + LTRF216A_ALS_READ_DATA_DELAY_US,
> + LTRF216A_ALS_READ_DATA_DELAY_US * 50);
> + if (ret) {
> + dev_err(dev, "failed to wait for measurement data: %d\n", ret);
> + return ret;
> + }
> +
> + ret = regmap_bulk_read(data->regmap, addr, buf, sizeof(buf));
> + if (ret) {
> + dev_err(dev, "failed to read measurement data: %d\n", ret);
> + return ret;
> + }
> +
> + return get_unaligned_le24(&buf[0]);
> +}
> +
> +static int ltrf216a_get_lux(struct ltrf216a_data *data)
> +{
> + int ret, greendata;
> + u64 lux, div;
> +
> + ret = ltrf216a_set_power_state(data, true);
> + if (ret)
> + return ret;
> +
> + greendata = ltrf216a_read_data(data, LTRF216A_ALS_DATA_0);
> + if (greendata < 0)
> + return greendata;
> +
> + ltrf216a_set_power_state(data, false);
> +
> + lux = greendata * 45 * LTRF216A_WIN_FAC * 100;
> + div = data->als_gain_fac * data->int_time_fac * 100;
> +
> + return div_u64(lux, div);
> +}
> +
> +static int ltrf216a_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan, int *val,
> + int *val2, long mask)
> +{
> + struct ltrf216a_data *data = iio_priv(indio_dev);
> + int ret;
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_PROCESSED:
> + mutex_lock(&data->lock);
> + ret = ltrf216a_get_lux(data);
> + mutex_unlock(&data->lock);
> + if (ret < 0)
> + return ret;
> + *val = ret;
> + return IIO_VAL_INT;
> + case IIO_CHAN_INFO_INT_TIME:
> + mutex_lock(&data->lock);
> + ret = ltrf216a_get_int_time(data, val, val2);
> + mutex_unlock(&data->lock);
> + return ret;
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int ltrf216a_write_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan, int val,
> + int val2, long mask)
> +{
> + struct ltrf216a_data *data = iio_priv(indio_dev);
> + int ret;
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_INT_TIME:
> + if (val != 0)
> + return -EINVAL;
> + mutex_lock(&data->lock);
> + ret = ltrf216a_set_int_time(data, val2);
> + mutex_unlock(&data->lock);
> + return ret;
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int ltrf216a_read_available(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + const int **vals, int *type, int *length,
> + long mask)
> +{
> + switch (mask) {
> + case IIO_CHAN_INFO_INT_TIME:
> + *length = ARRAY_SIZE(ltrf216a_int_time_available) * 2;
> + *vals = (const int *)ltrf216a_int_time_available;
> + *type = IIO_VAL_INT_PLUS_MICRO;
> + return IIO_AVAIL_LIST;
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static const struct iio_info ltrf216a_info = {
> + .read_raw = ltrf216a_read_raw,
> + .write_raw = ltrf216a_write_raw,
> + .read_avail = ltrf216a_read_available,
> +};
> +
> +static bool ltrf216a_readable_reg(struct device *dev, unsigned int reg)
> +{
> + switch (reg) {
> + case LTRF216A_MAIN_CTRL:
> + case LTRF216A_ALS_MEAS_RES:
> + case LTRF216A_ALS_GAIN:
> + case LTRF216A_PART_ID:
> + case LTRF216A_MAIN_STATUS:
> + case LTRF216A_ALS_CLEAR_DATA_0:
> + case LTRF216A_ALS_CLEAR_DATA_1:
> + case LTRF216A_ALS_CLEAR_DATA_2:
> + case LTRF216A_ALS_DATA_0:
> + case LTRF216A_ALS_DATA_1:
> + case LTRF216A_ALS_DATA_2:
> + case LTRF216A_INT_CFG:
> + case LTRF216A_INT_PST:
> + case LTRF216A_ALS_THRES_UP_0:
> + case LTRF216A_ALS_THRES_UP_1:
> + case LTRF216A_ALS_THRES_UP_2:
> + case LTRF216A_ALS_THRES_LOW_0:
> + case LTRF216A_ALS_THRES_LOW_1:
> + case LTRF216A_ALS_THRES_LOW_2:
> + return true;
> + default:
> + return false;
> + }
> +}
> +
> +static bool ltrf216a_writable_reg(struct device *dev, unsigned int reg)
> +{
> + switch (reg) {
> + case LTRF216A_MAIN_CTRL:
> + case LTRF216A_ALS_MEAS_RES:
> + case LTRF216A_ALS_GAIN:
> + case LTRF216A_INT_CFG:
> + case LTRF216A_INT_PST:
> + case LTRF216A_ALS_THRES_UP_0:
> + case LTRF216A_ALS_THRES_UP_1:
> + case LTRF216A_ALS_THRES_UP_2:
> + case LTRF216A_ALS_THRES_LOW_0:
> + case LTRF216A_ALS_THRES_LOW_1:
> + case LTRF216A_ALS_THRES_LOW_2:
> + return true;
> + default:
> + return false;
> + }
> +}
> +
> +static bool ltrf216a_volatile_reg(struct device *dev, unsigned int reg)
> +{
> + switch (reg) {
> + case LTRF216A_ALS_CLEAR_DATA_0:
> + case LTRF216A_ALS_CLEAR_DATA_1:
> + case LTRF216A_ALS_CLEAR_DATA_2:
> + case LTRF216A_ALS_DATA_0:
> + case LTRF216A_ALS_DATA_1:
> + case LTRF216A_ALS_DATA_2:
> + return true;
> + default:
> + return false;
> + }
> +}
> +
> +static bool ltrf216a_precious_reg(struct device *dev, unsigned int reg)
> +{
> + return reg == LTRF216A_MAIN_STATUS;
> +}
> +
> +static const struct regmap_config ltrf216a_regmap_config = {
> + .name = "ltrf216a",
> + .reg_bits = 8,
> + .val_bits = 8,
> + .cache_type = REGCACHE_RBTREE,
> + .max_register = LTRF216A_ALS_THRES_LOW_2,
> + .readable_reg = ltrf216a_readable_reg,
> + .writeable_reg = ltrf216a_writable_reg,
> + .volatile_reg = ltrf216a_volatile_reg,
> + .precious_reg = ltrf216a_precious_reg,
> + .disable_locking = true,
> +};
> +
> +static int ltrf216a_probe(struct i2c_client *client)
> +{
> + struct ltrf216a_data *data;
> + struct iio_dev *indio_dev;
> + int ret;
> +
> + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
> + if (!indio_dev)
> + return -ENOMEM;
> +
> + data = iio_priv(indio_dev);
> +
> + data->regmap = devm_regmap_init_i2c(client, <rf216a_regmap_config);
> + if (IS_ERR(data->regmap))
> + return dev_err_probe(&client->dev, PTR_ERR(data->regmap),
> + "regmap initialization failed\n");
> +
> + i2c_set_clientdata(client, indio_dev);
> + data->client = client;
> +
> + mutex_init(&data->lock);
> +
> + indio_dev->info = <rf216a_info;
> + indio_dev->name = "ltrf216a";
> + indio_dev->channels = ltrf216a_channels;
> + indio_dev->num_channels = ARRAY_SIZE(ltrf216a_channels);
> + indio_dev->modes = INDIO_DIRECT_MODE;
> +
> + /* reset sensor, chip fails to respond to this, so ignore any errors */
> + ltrf216a_reset(indio_dev);
> +
> + ret = regmap_reinit_cache(data->regmap, <rf216a_regmap_config);
> + if (ret)
> + return dev_err_probe(&client->dev, ret,
> + "failed to reinit regmap cache\n");
> +
> + ret = devm_pm_runtime_enable(&client->dev);
> + if (ret)
> + return dev_err_probe(&client->dev, ret,
> + "failed to enable runtime PM\n");
> +
> + pm_runtime_set_autosuspend_delay(&client->dev, 1000);
> + pm_runtime_use_autosuspend(&client->dev);
> +
> + if (!IS_ENABLED(CONFIG_PM)) {
> + ret = ltrf216a_enable(indio_dev);
> + if (ret)
> + return ret;
> + }
> +
> + data->int_time = 100000;
> + data->int_time_fac = 100;
> + data->als_gain_fac = 3;
> +
> + return devm_iio_device_register(&client->dev, indio_dev);
> +}
> +
> +static int ltrf216a_runtime_suspend(struct device *dev)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> + struct ltrf216a_data *data = iio_priv(indio_dev);
> + int ret;
> +
> + ret = ltrf216a_disable(indio_dev);
> + if (ret)
> + return ret;
> +
> + regcache_cache_only(data->regmap, true);
> +
> + return 0;
> +}
> +
> +static int ltrf216a_runtime_resume(struct device *dev)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> + struct ltrf216a_data *data = iio_priv(indio_dev);
> + int ret;
> +
> + regcache_cache_only(data->regmap, false);
> + regcache_mark_dirty(data->regmap);
> + ret = regcache_sync(data->regmap);
> + if (ret)
> + goto cache_only;
> +
> + ret = ltrf216a_enable(indio_dev);
> + if (ret)
> + goto cache_only;
> +
> + return 0;
> +
> +cache_only:
> + regcache_cache_only(data->regmap, true);
> +
> + return ret;
> +}
> +
> +static DEFINE_RUNTIME_DEV_PM_OPS(ltrf216a_pm_ops, ltrf216a_runtime_suspend,
> + ltrf216a_runtime_resume, NULL);
> +
> +static const struct i2c_device_id ltrf216a_id[] = {
> + { "ltrf216a" },
> + {}
> +};
> +MODULE_DEVICE_TABLE(i2c, ltrf216a_id);
> +
> +static const struct of_device_id ltrf216a_of_match[] = {
> + { .compatible = "liteon,ltrf216a" },
> + { .compatible = "ltr,ltrf216a" },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, ltrf216a_of_match);
> +
> +static struct i2c_driver ltrf216a_driver = {
> + .driver = {
> + .name = "ltrf216a",
> + .pm = pm_ptr(<rf216a_pm_ops),
> + .of_match_table = ltrf216a_of_match,
> + },
> + .probe_new = ltrf216a_probe,
> + .id_table = ltrf216a_id,
> +};
> +module_i2c_driver(ltrf216a_driver);
> +
> +MODULE_AUTHOR("Shreeya Patel <shreeya.patel@...labora.com>");
> +MODULE_AUTHOR("Shi Zhigang <Zhigang.Shi@...eon.com>");
> +MODULE_DESCRIPTION("LTRF216A ambient light sensor driver");
> +MODULE_LICENSE("GPL");
> --
> 2.30.2
>
--
With Best Regards,
Andy Shevchenko
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