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linux/drivers/iio/light/jsa1212.c
Thomas Gleixner 2025cf9e19 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms and conditions of the gnu general public license
  version 2 as published by the free software foundation this program
  is distributed in the hope it will be useful but without any
  warranty without even the implied warranty of merchantability or
  fitness for a particular purpose see the gnu general public license
  for more details

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 263 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141901.208660670@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:36:37 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* JSA1212 Ambient Light & Proximity Sensor Driver
*
* Copyright (c) 2014, Intel Corporation.
*
* JSA1212 I2C slave address: 0x44(ADDR tied to GND), 0x45(ADDR tied to VDD)
*
* TODO: Interrupt support, thresholds, range support.
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/acpi.h>
#include <linux/regmap.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
/* JSA1212 reg address */
#define JSA1212_CONF_REG 0x01
#define JSA1212_INT_REG 0x02
#define JSA1212_PXS_LT_REG 0x03
#define JSA1212_PXS_HT_REG 0x04
#define JSA1212_ALS_TH1_REG 0x05
#define JSA1212_ALS_TH2_REG 0x06
#define JSA1212_ALS_TH3_REG 0x07
#define JSA1212_PXS_DATA_REG 0x08
#define JSA1212_ALS_DT1_REG 0x09
#define JSA1212_ALS_DT2_REG 0x0A
#define JSA1212_ALS_RNG_REG 0x0B
#define JSA1212_MAX_REG 0x0C
/* JSA1212 reg masks */
#define JSA1212_CONF_MASK 0xFF
#define JSA1212_INT_MASK 0xFF
#define JSA1212_PXS_LT_MASK 0xFF
#define JSA1212_PXS_HT_MASK 0xFF
#define JSA1212_ALS_TH1_MASK 0xFF
#define JSA1212_ALS_TH2_LT_MASK 0x0F
#define JSA1212_ALS_TH2_HT_MASK 0xF0
#define JSA1212_ALS_TH3_MASK 0xFF
#define JSA1212_PXS_DATA_MASK 0xFF
#define JSA1212_ALS_DATA_MASK 0x0FFF
#define JSA1212_ALS_DT1_MASK 0xFF
#define JSA1212_ALS_DT2_MASK 0x0F
#define JSA1212_ALS_RNG_MASK 0x07
/* JSA1212 CONF REG bits */
#define JSA1212_CONF_PXS_MASK 0x80
#define JSA1212_CONF_PXS_ENABLE 0x80
#define JSA1212_CONF_PXS_DISABLE 0x00
#define JSA1212_CONF_ALS_MASK 0x04
#define JSA1212_CONF_ALS_ENABLE 0x04
#define JSA1212_CONF_ALS_DISABLE 0x00
#define JSA1212_CONF_IRDR_MASK 0x08
/* Proxmity sensing IRDR current sink settings */
#define JSA1212_CONF_IRDR_200MA 0x08
#define JSA1212_CONF_IRDR_100MA 0x00
#define JSA1212_CONF_PXS_SLP_MASK 0x70
#define JSA1212_CONF_PXS_SLP_0MS 0x70
#define JSA1212_CONF_PXS_SLP_12MS 0x60
#define JSA1212_CONF_PXS_SLP_50MS 0x50
#define JSA1212_CONF_PXS_SLP_75MS 0x40
#define JSA1212_CONF_PXS_SLP_100MS 0x30
#define JSA1212_CONF_PXS_SLP_200MS 0x20
#define JSA1212_CONF_PXS_SLP_400MS 0x10
#define JSA1212_CONF_PXS_SLP_800MS 0x00
/* JSA1212 INT REG bits */
#define JSA1212_INT_CTRL_MASK 0x01
#define JSA1212_INT_CTRL_EITHER 0x00
#define JSA1212_INT_CTRL_BOTH 0x01
#define JSA1212_INT_ALS_PRST_MASK 0x06
#define JSA1212_INT_ALS_PRST_1CONV 0x00
#define JSA1212_INT_ALS_PRST_4CONV 0x02
#define JSA1212_INT_ALS_PRST_8CONV 0x04
#define JSA1212_INT_ALS_PRST_16CONV 0x06
#define JSA1212_INT_ALS_FLAG_MASK 0x08
#define JSA1212_INT_ALS_FLAG_CLR 0x00
#define JSA1212_INT_PXS_PRST_MASK 0x60
#define JSA1212_INT_PXS_PRST_1CONV 0x00
#define JSA1212_INT_PXS_PRST_4CONV 0x20
#define JSA1212_INT_PXS_PRST_8CONV 0x40
#define JSA1212_INT_PXS_PRST_16CONV 0x60
#define JSA1212_INT_PXS_FLAG_MASK 0x80
#define JSA1212_INT_PXS_FLAG_CLR 0x00
/* JSA1212 ALS RNG REG bits */
#define JSA1212_ALS_RNG_0_2048 0x00
#define JSA1212_ALS_RNG_0_1024 0x01
#define JSA1212_ALS_RNG_0_512 0x02
#define JSA1212_ALS_RNG_0_256 0x03
#define JSA1212_ALS_RNG_0_128 0x04
/* JSA1212 INT threshold range */
#define JSA1212_ALS_TH_MIN 0x0000
#define JSA1212_ALS_TH_MAX 0x0FFF
#define JSA1212_PXS_TH_MIN 0x00
#define JSA1212_PXS_TH_MAX 0xFF
#define JSA1212_ALS_DELAY_MS 200
#define JSA1212_PXS_DELAY_MS 100
#define JSA1212_DRIVER_NAME "jsa1212"
#define JSA1212_REGMAP_NAME "jsa1212_regmap"
enum jsa1212_op_mode {
JSA1212_OPMODE_ALS_EN,
JSA1212_OPMODE_PXS_EN,
};
struct jsa1212_data {
struct i2c_client *client;
struct mutex lock;
u8 als_rng_idx;
bool als_en; /* ALS enable status */
bool pxs_en; /* proximity enable status */
struct regmap *regmap;
};
/* ALS range idx to val mapping */
static const int jsa1212_als_range_val[] = {2048, 1024, 512, 256, 128,
128, 128, 128};
/* Enables or disables ALS function based on status */
static int jsa1212_als_enable(struct jsa1212_data *data, u8 status)
{
int ret;
ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
JSA1212_CONF_ALS_MASK,
status);
if (ret < 0)
return ret;
data->als_en = !!status;
return 0;
}
/* Enables or disables PXS function based on status */
static int jsa1212_pxs_enable(struct jsa1212_data *data, u8 status)
{
int ret;
ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
JSA1212_CONF_PXS_MASK,
status);
if (ret < 0)
return ret;
data->pxs_en = !!status;
return 0;
}
static int jsa1212_read_als_data(struct jsa1212_data *data,
unsigned int *val)
{
int ret;
__le16 als_data;
ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
if (ret < 0)
return ret;
/* Delay for data output */
msleep(JSA1212_ALS_DELAY_MS);
/* Read 12 bit data */
ret = regmap_bulk_read(data->regmap, JSA1212_ALS_DT1_REG, &als_data, 2);
if (ret < 0) {
dev_err(&data->client->dev, "als data read err\n");
goto als_data_read_err;
}
*val = le16_to_cpu(als_data);
als_data_read_err:
return jsa1212_als_enable(data, JSA1212_CONF_ALS_DISABLE);
}
static int jsa1212_read_pxs_data(struct jsa1212_data *data,
unsigned int *val)
{
int ret;
unsigned int pxs_data;
ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
if (ret < 0)
return ret;
/* Delay for data output */
msleep(JSA1212_PXS_DELAY_MS);
/* Read out all data */
ret = regmap_read(data->regmap, JSA1212_PXS_DATA_REG, &pxs_data);
if (ret < 0) {
dev_err(&data->client->dev, "pxs data read err\n");
goto pxs_data_read_err;
}
*val = pxs_data & JSA1212_PXS_DATA_MASK;
pxs_data_read_err:
return jsa1212_pxs_enable(data, JSA1212_CONF_PXS_DISABLE);
}
static int jsa1212_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
int ret;
struct jsa1212_data *data = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_RAW:
mutex_lock(&data->lock);
switch (chan->type) {
case IIO_LIGHT:
ret = jsa1212_read_als_data(data, val);
break;
case IIO_PROXIMITY:
ret = jsa1212_read_pxs_data(data, val);
break;
default:
ret = -EINVAL;
break;
}
mutex_unlock(&data->lock);
return ret < 0 ? ret : IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_LIGHT:
*val = jsa1212_als_range_val[data->als_rng_idx];
*val2 = BIT(12); /* Max 12 bit value */
return IIO_VAL_FRACTIONAL;
default:
break;
}
break;
default:
break;
}
return -EINVAL;
}
static const struct iio_chan_spec jsa1212_channels[] = {
{
.type = IIO_LIGHT,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE),
},
{
.type = IIO_PROXIMITY,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
}
};
static const struct iio_info jsa1212_info = {
.read_raw = &jsa1212_read_raw,
};
static int jsa1212_chip_init(struct jsa1212_data *data)
{
int ret;
ret = regmap_write(data->regmap, JSA1212_CONF_REG,
(JSA1212_CONF_PXS_SLP_50MS |
JSA1212_CONF_IRDR_200MA));
if (ret < 0)
return ret;
ret = regmap_write(data->regmap, JSA1212_INT_REG,
JSA1212_INT_ALS_PRST_4CONV);
if (ret < 0)
return ret;
data->als_rng_idx = JSA1212_ALS_RNG_0_2048;
return 0;
}
static bool jsa1212_is_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case JSA1212_PXS_DATA_REG:
case JSA1212_ALS_DT1_REG:
case JSA1212_ALS_DT2_REG:
case JSA1212_INT_REG:
return true;
default:
return false;
}
}
static const struct regmap_config jsa1212_regmap_config = {
.name = JSA1212_REGMAP_NAME,
.reg_bits = 8,
.val_bits = 8,
.max_register = JSA1212_MAX_REG,
.cache_type = REGCACHE_RBTREE,
.volatile_reg = jsa1212_is_volatile_reg,
};
static int jsa1212_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct jsa1212_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, &jsa1212_regmap_config);
if (IS_ERR(regmap)) {
dev_err(&client->dev, "Regmap initialization 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);
ret = jsa1212_chip_init(data);
if (ret < 0)
return ret;
indio_dev->dev.parent = &client->dev;
indio_dev->channels = jsa1212_channels;
indio_dev->num_channels = ARRAY_SIZE(jsa1212_channels);
indio_dev->name = JSA1212_DRIVER_NAME;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &jsa1212_info;
ret = iio_device_register(indio_dev);
if (ret < 0)
dev_err(&client->dev, "%s: register device failed\n", __func__);
return ret;
}
/* power off the device */
static int jsa1212_power_off(struct jsa1212_data *data)
{
int ret;
mutex_lock(&data->lock);
ret = regmap_update_bits(data->regmap, JSA1212_CONF_REG,
JSA1212_CONF_ALS_MASK |
JSA1212_CONF_PXS_MASK,
JSA1212_CONF_ALS_DISABLE |
JSA1212_CONF_PXS_DISABLE);
if (ret < 0)
dev_err(&data->client->dev, "power off cmd failed\n");
mutex_unlock(&data->lock);
return ret;
}
static int jsa1212_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct jsa1212_data *data = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
return jsa1212_power_off(data);
}
#ifdef CONFIG_PM_SLEEP
static int jsa1212_suspend(struct device *dev)
{
struct jsa1212_data *data;
data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
return jsa1212_power_off(data);
}
static int jsa1212_resume(struct device *dev)
{
int ret = 0;
struct jsa1212_data *data;
data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
mutex_lock(&data->lock);
if (data->als_en) {
ret = jsa1212_als_enable(data, JSA1212_CONF_ALS_ENABLE);
if (ret < 0) {
dev_err(dev, "als resume failed\n");
goto unlock_and_ret;
}
}
if (data->pxs_en) {
ret = jsa1212_pxs_enable(data, JSA1212_CONF_PXS_ENABLE);
if (ret < 0)
dev_err(dev, "pxs resume failed\n");
}
unlock_and_ret:
mutex_unlock(&data->lock);
return ret;
}
static SIMPLE_DEV_PM_OPS(jsa1212_pm_ops, jsa1212_suspend, jsa1212_resume);
#define JSA1212_PM_OPS (&jsa1212_pm_ops)
#else
#define JSA1212_PM_OPS NULL
#endif
static const struct acpi_device_id jsa1212_acpi_match[] = {
{"JSA1212", 0},
{ },
};
MODULE_DEVICE_TABLE(acpi, jsa1212_acpi_match);
static const struct i2c_device_id jsa1212_id[] = {
{ JSA1212_DRIVER_NAME, 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, jsa1212_id);
static struct i2c_driver jsa1212_driver = {
.driver = {
.name = JSA1212_DRIVER_NAME,
.pm = JSA1212_PM_OPS,
.acpi_match_table = ACPI_PTR(jsa1212_acpi_match),
},
.probe = jsa1212_probe,
.remove = jsa1212_remove,
.id_table = jsa1212_id,
};
module_i2c_driver(jsa1212_driver);
MODULE_AUTHOR("Sathya Kuppuswamy <sathyanarayanan.kuppuswamy@linux.intel.com>");
MODULE_DESCRIPTION("JSA1212 proximity/ambient light sensor driver");
MODULE_LICENSE("GPL v2");
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