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linux_dsm_epyc7002/drivers/iio/light/isl29028.c
Thomas Gleixner 9952f6918d treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 
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 you should have received a copy of the gnu general
  public license along with this program if not see http www gnu org
  licenses

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 228 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Steve Winslow <swinslow@gmail.com>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190528171438.107155473@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:29:52 -07:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* IIO driver for the light sensor ISL29028.
* ISL29028 is Concurrent Ambient Light and Proximity Sensor
*
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2016-2017 Brian Masney <masneyb@onstation.org>
*
* Datasheets:
* - http://www.intersil.com/content/dam/Intersil/documents/isl2/isl29028.pdf
* - http://www.intersil.com/content/dam/Intersil/documents/isl2/isl29030.pdf
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/pm_runtime.h>
#define ISL29028_CONV_TIME_MS 100
#define ISL29028_REG_CONFIGURE 0x01
#define ISL29028_CONF_ALS_IR_MODE_ALS 0
#define ISL29028_CONF_ALS_IR_MODE_IR BIT(0)
#define ISL29028_CONF_ALS_IR_MODE_MASK BIT(0)
#define ISL29028_CONF_ALS_RANGE_LOW_LUX 0
#define ISL29028_CONF_ALS_RANGE_HIGH_LUX BIT(1)
#define ISL29028_CONF_ALS_RANGE_MASK BIT(1)
#define ISL29028_CONF_ALS_DIS 0
#define ISL29028_CONF_ALS_EN BIT(2)
#define ISL29028_CONF_ALS_EN_MASK BIT(2)
#define ISL29028_CONF_PROX_SLP_SH 4
#define ISL29028_CONF_PROX_SLP_MASK (7 << ISL29028_CONF_PROX_SLP_SH)
#define ISL29028_CONF_PROX_EN BIT(7)
#define ISL29028_CONF_PROX_EN_MASK BIT(7)
#define ISL29028_REG_INTERRUPT 0x02
#define ISL29028_REG_PROX_DATA 0x08
#define ISL29028_REG_ALSIR_L 0x09
#define ISL29028_REG_ALSIR_U 0x0A
#define ISL29028_REG_TEST1_MODE 0x0E
#define ISL29028_REG_TEST2_MODE 0x0F
#define ISL29028_NUM_REGS (ISL29028_REG_TEST2_MODE + 1)
#define ISL29028_POWER_OFF_DELAY_MS 2000
struct isl29028_prox_data {
int sampling_int;
int sampling_fract;
int sleep_time;
};
static const struct isl29028_prox_data isl29028_prox_data[] = {
{ 1, 250000, 800 },
{ 2, 500000, 400 },
{ 5, 0, 200 },
{ 10, 0, 100 },
{ 13, 300000, 75 },
{ 20, 0, 50 },
{ 80, 0, 13 }, /*
* Note: Data sheet lists 12.5 ms sleep time.
* Round up a half millisecond for msleep().
*/
{ 100, 0, 0 }
};
enum isl29028_als_ir_mode {
ISL29028_MODE_NONE = 0,
ISL29028_MODE_ALS,
ISL29028_MODE_IR,
};
struct isl29028_chip {
struct mutex lock;
struct regmap *regmap;
int prox_sampling_int;
int prox_sampling_frac;
bool enable_prox;
int lux_scale;
enum isl29028_als_ir_mode als_ir_mode;
};
static int isl29028_find_prox_sleep_index(int sampling_int, int sampling_fract)
{
int i;
for (i = 0; i < ARRAY_SIZE(isl29028_prox_data); ++i) {
if (isl29028_prox_data[i].sampling_int == sampling_int &&
isl29028_prox_data[i].sampling_fract == sampling_fract)
return i;
}
return -EINVAL;
}
static int isl29028_set_proxim_sampling(struct isl29028_chip *chip,
int sampling_int, int sampling_fract)
{
struct device *dev = regmap_get_device(chip->regmap);
int sleep_index, ret;
sleep_index = isl29028_find_prox_sleep_index(sampling_int,
sampling_fract);
if (sleep_index < 0)
return sleep_index;
ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
ISL29028_CONF_PROX_SLP_MASK,
sleep_index << ISL29028_CONF_PROX_SLP_SH);
if (ret < 0) {
dev_err(dev, "%s(): Error %d setting the proximity sampling\n",
__func__, ret);
return ret;
}
chip->prox_sampling_int = sampling_int;
chip->prox_sampling_frac = sampling_fract;
return ret;
}
static int isl29028_enable_proximity(struct isl29028_chip *chip)
{
int prox_index, ret;
ret = isl29028_set_proxim_sampling(chip, chip->prox_sampling_int,
chip->prox_sampling_frac);
if (ret < 0)
return ret;
ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
ISL29028_CONF_PROX_EN_MASK,
ISL29028_CONF_PROX_EN);
if (ret < 0)
return ret;
/* Wait for conversion to be complete for first sample */
prox_index = isl29028_find_prox_sleep_index(chip->prox_sampling_int,
chip->prox_sampling_frac);
if (prox_index < 0)
return prox_index;
msleep(isl29028_prox_data[prox_index].sleep_time);
return 0;
}
static int isl29028_set_als_scale(struct isl29028_chip *chip, int lux_scale)
{
struct device *dev = regmap_get_device(chip->regmap);
int val = (lux_scale == 2000) ? ISL29028_CONF_ALS_RANGE_HIGH_LUX :
ISL29028_CONF_ALS_RANGE_LOW_LUX;
int ret;
ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
ISL29028_CONF_ALS_RANGE_MASK, val);
if (ret < 0) {
dev_err(dev, "%s(): Error %d setting the ALS scale\n", __func__,
ret);
return ret;
}
chip->lux_scale = lux_scale;
return ret;
}
static int isl29028_set_als_ir_mode(struct isl29028_chip *chip,
enum isl29028_als_ir_mode mode)
{
int ret;
if (chip->als_ir_mode == mode)
return 0;
ret = isl29028_set_als_scale(chip, chip->lux_scale);
if (ret < 0)
return ret;
switch (mode) {
case ISL29028_MODE_ALS:
ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
ISL29028_CONF_ALS_IR_MODE_MASK,
ISL29028_CONF_ALS_IR_MODE_ALS);
if (ret < 0)
return ret;
ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
ISL29028_CONF_ALS_RANGE_MASK,
ISL29028_CONF_ALS_RANGE_HIGH_LUX);
break;
case ISL29028_MODE_IR:
ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
ISL29028_CONF_ALS_IR_MODE_MASK,
ISL29028_CONF_ALS_IR_MODE_IR);
break;
case ISL29028_MODE_NONE:
return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
ISL29028_CONF_ALS_EN_MASK,
ISL29028_CONF_ALS_DIS);
}
if (ret < 0)
return ret;
/* Enable the ALS/IR */
ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
ISL29028_CONF_ALS_EN_MASK,
ISL29028_CONF_ALS_EN);
if (ret < 0)
return ret;
/* Need to wait for conversion time if ALS/IR mode enabled */
msleep(ISL29028_CONV_TIME_MS);
chip->als_ir_mode = mode;
return 0;
}
static int isl29028_read_als_ir(struct isl29028_chip *chip, int *als_ir)
{
struct device *dev = regmap_get_device(chip->regmap);
unsigned int lsb;
unsigned int msb;
int ret;
ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_L, &lsb);
if (ret < 0) {
dev_err(dev,
"%s(): Error %d reading register ALSIR_L\n",
__func__, ret);
return ret;
}
ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_U, &msb);
if (ret < 0) {
dev_err(dev,
"%s(): Error %d reading register ALSIR_U\n",
__func__, ret);
return ret;
}
*als_ir = ((msb & 0xF) << 8) | (lsb & 0xFF);
return 0;
}
static int isl29028_read_proxim(struct isl29028_chip *chip, int *prox)
{
struct device *dev = regmap_get_device(chip->regmap);
unsigned int data;
int ret;
if (!chip->enable_prox) {
ret = isl29028_enable_proximity(chip);
if (ret < 0)
return ret;
chip->enable_prox = true;
}
ret = regmap_read(chip->regmap, ISL29028_REG_PROX_DATA, &data);
if (ret < 0) {
dev_err(dev, "%s(): Error %d reading register PROX_DATA\n",
__func__, ret);
return ret;
}
*prox = data;
return 0;
}
static int isl29028_als_get(struct isl29028_chip *chip, int *als_data)
{
struct device *dev = regmap_get_device(chip->regmap);
int ret;
int als_ir_data;
ret = isl29028_set_als_ir_mode(chip, ISL29028_MODE_ALS);
if (ret < 0) {
dev_err(dev, "%s(): Error %d enabling ALS mode\n", __func__,
ret);
return ret;
}
ret = isl29028_read_als_ir(chip, &als_ir_data);
if (ret < 0)
return ret;
/*
* convert als data count to lux.
* if lux_scale = 125, lux = count * 0.031
* if lux_scale = 2000, lux = count * 0.49
*/
if (chip->lux_scale == 125)
als_ir_data = (als_ir_data * 31) / 1000;
else
als_ir_data = (als_ir_data * 49) / 100;
*als_data = als_ir_data;
return 0;
}
static int isl29028_ir_get(struct isl29028_chip *chip, int *ir_data)
{
struct device *dev = regmap_get_device(chip->regmap);
int ret;
ret = isl29028_set_als_ir_mode(chip, ISL29028_MODE_IR);
if (ret < 0) {
dev_err(dev, "%s(): Error %d enabling IR mode\n", __func__,
ret);
return ret;
}
return isl29028_read_als_ir(chip, ir_data);
}
static int isl29028_set_pm_runtime_busy(struct isl29028_chip *chip, bool on)
{
struct device *dev = regmap_get_device(chip->regmap);
int ret;
if (on) {
ret = pm_runtime_get_sync(dev);
if (ret < 0)
pm_runtime_put_noidle(dev);
} else {
pm_runtime_mark_last_busy(dev);
ret = pm_runtime_put_autosuspend(dev);
}
return ret;
}
/* Channel IO */
static int isl29028_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct isl29028_chip *chip = iio_priv(indio_dev);
struct device *dev = regmap_get_device(chip->regmap);
int ret;
ret = isl29028_set_pm_runtime_busy(chip, true);
if (ret < 0)
return ret;
mutex_lock(&chip->lock);
ret = -EINVAL;
switch (chan->type) {
case IIO_PROXIMITY:
if (mask != IIO_CHAN_INFO_SAMP_FREQ) {
dev_err(dev,
"%s(): proximity: Mask value 0x%08lx is not supported\n",
__func__, mask);
break;
}
if (val < 1 || val > 100) {
dev_err(dev,
"%s(): proximity: Sampling frequency %d is not in the range [1:100]\n",
__func__, val);
break;
}
ret = isl29028_set_proxim_sampling(chip, val, val2);
break;
case IIO_LIGHT:
if (mask != IIO_CHAN_INFO_SCALE) {
dev_err(dev,
"%s(): light: Mask value 0x%08lx is not supported\n",
__func__, mask);
break;
}
if (val != 125 && val != 2000) {
dev_err(dev,
"%s(): light: Lux scale %d is not in the set {125, 2000}\n",
__func__, val);
break;
}
ret = isl29028_set_als_scale(chip, val);
break;
default:
dev_err(dev, "%s(): Unsupported channel type %x\n",
__func__, chan->type);
break;
}
mutex_unlock(&chip->lock);
if (ret < 0)
return ret;
ret = isl29028_set_pm_runtime_busy(chip, false);
if (ret < 0)
return ret;
return ret;
}
static int isl29028_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct isl29028_chip *chip = iio_priv(indio_dev);
struct device *dev = regmap_get_device(chip->regmap);
int ret, pm_ret;
ret = isl29028_set_pm_runtime_busy(chip, true);
if (ret < 0)
return ret;
mutex_lock(&chip->lock);
ret = -EINVAL;
switch (mask) {
case IIO_CHAN_INFO_RAW:
case IIO_CHAN_INFO_PROCESSED:
switch (chan->type) {
case IIO_LIGHT:
ret = isl29028_als_get(chip, val);
break;
case IIO_INTENSITY:
ret = isl29028_ir_get(chip, val);
break;
case IIO_PROXIMITY:
ret = isl29028_read_proxim(chip, val);
break;
default:
break;
}
if (ret < 0)
break;
ret = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_SAMP_FREQ:
if (chan->type != IIO_PROXIMITY)
break;
*val = chip->prox_sampling_int;
*val2 = chip->prox_sampling_frac;
ret = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_SCALE:
if (chan->type != IIO_LIGHT)
break;
*val = chip->lux_scale;
ret = IIO_VAL_INT;
break;
default:
dev_err(dev, "%s(): mask value 0x%08lx is not supported\n",
__func__, mask);
break;
}
mutex_unlock(&chip->lock);
if (ret < 0)
return ret;
/**
* Preserve the ret variable if the call to
* isl29028_set_pm_runtime_busy() is successful so the reading
* (if applicable) is returned to user space.
*/
pm_ret = isl29028_set_pm_runtime_busy(chip, false);
if (pm_ret < 0)
return pm_ret;
return ret;
}
static IIO_CONST_ATTR(in_proximity_sampling_frequency_available,
"1.25 2.5 5 10 13.3 20 80 100");
static IIO_CONST_ATTR(in_illuminance_scale_available, "125 2000");
#define ISL29028_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
static struct attribute *isl29028_attributes[] = {
ISL29028_CONST_ATTR(in_proximity_sampling_frequency_available),
ISL29028_CONST_ATTR(in_illuminance_scale_available),
NULL,
};
static const struct attribute_group isl29108_group = {
.attrs = isl29028_attributes,
};
static const struct iio_chan_spec isl29028_channels[] = {
{
.type = IIO_LIGHT,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
BIT(IIO_CHAN_INFO_SCALE),
}, {
.type = IIO_INTENSITY,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
}, {
.type = IIO_PROXIMITY,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SAMP_FREQ),
}
};
static const struct iio_info isl29028_info = {
.attrs = &isl29108_group,
.read_raw = isl29028_read_raw,
.write_raw = isl29028_write_raw,
};
static int isl29028_clear_configure_reg(struct isl29028_chip *chip)
{
struct device *dev = regmap_get_device(chip->regmap);
int ret;
ret = regmap_write(chip->regmap, ISL29028_REG_CONFIGURE, 0x0);
if (ret < 0)
dev_err(dev, "%s(): Error %d clearing the CONFIGURE register\n",
__func__, ret);
chip->als_ir_mode = ISL29028_MODE_NONE;
chip->enable_prox = false;
return ret;
}
static bool isl29028_is_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case ISL29028_REG_INTERRUPT:
case ISL29028_REG_PROX_DATA:
case ISL29028_REG_ALSIR_L:
case ISL29028_REG_ALSIR_U:
return true;
default:
return false;
}
}
static const struct regmap_config isl29028_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.volatile_reg = isl29028_is_volatile_reg,
.max_register = ISL29028_NUM_REGS - 1,
.num_reg_defaults_raw = ISL29028_NUM_REGS,
.cache_type = REGCACHE_RBTREE,
};
static int isl29028_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct isl29028_chip *chip;
struct iio_dev *indio_dev;
int ret;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
if (!indio_dev)
return -ENOMEM;
chip = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
mutex_init(&chip->lock);
chip->regmap = devm_regmap_init_i2c(client, &isl29028_regmap_config);
if (IS_ERR(chip->regmap)) {
ret = PTR_ERR(chip->regmap);
dev_err(&client->dev, "%s: Error %d initializing regmap\n",
__func__, ret);
return ret;
}
chip->enable_prox = false;
chip->prox_sampling_int = 20;
chip->prox_sampling_frac = 0;
chip->lux_scale = 2000;
ret = regmap_write(chip->regmap, ISL29028_REG_TEST1_MODE, 0x0);
if (ret < 0) {
dev_err(&client->dev,
"%s(): Error %d writing to TEST1_MODE register\n",
__func__, ret);
return ret;
}
ret = regmap_write(chip->regmap, ISL29028_REG_TEST2_MODE, 0x0);
if (ret < 0) {
dev_err(&client->dev,
"%s(): Error %d writing to TEST2_MODE register\n",
__func__, ret);
return ret;
}
ret = isl29028_clear_configure_reg(chip);
if (ret < 0)
return ret;
indio_dev->info = &isl29028_info;
indio_dev->channels = isl29028_channels;
indio_dev->num_channels = ARRAY_SIZE(isl29028_channels);
indio_dev->name = id->name;
indio_dev->dev.parent = &client->dev;
indio_dev->modes = INDIO_DIRECT_MODE;
pm_runtime_enable(&client->dev);
pm_runtime_set_autosuspend_delay(&client->dev,
ISL29028_POWER_OFF_DELAY_MS);
pm_runtime_use_autosuspend(&client->dev);
ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
if (ret < 0) {
dev_err(&client->dev,
"%s(): iio registration failed with error %d\n",
__func__, ret);
return ret;
}
return 0;
}
static int isl29028_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct isl29028_chip *chip = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
pm_runtime_disable(&client->dev);
pm_runtime_set_suspended(&client->dev);
pm_runtime_put_noidle(&client->dev);
return isl29028_clear_configure_reg(chip);
}
static int __maybe_unused isl29028_suspend(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct isl29028_chip *chip = iio_priv(indio_dev);
int ret;
mutex_lock(&chip->lock);
ret = isl29028_clear_configure_reg(chip);
mutex_unlock(&chip->lock);
return ret;
}
static int __maybe_unused isl29028_resume(struct device *dev)
{
/**
* The specific component (ALS/IR or proximity) will enable itself as
* needed the next time that the user requests a reading. This is done
* above in isl29028_set_als_ir_mode() and isl29028_enable_proximity().
*/
return 0;
}
static const struct dev_pm_ops isl29028_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
SET_RUNTIME_PM_OPS(isl29028_suspend, isl29028_resume, NULL)
};
static const struct i2c_device_id isl29028_id[] = {
{"isl29028", 0},
{"isl29030", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, isl29028_id);
static const struct of_device_id isl29028_of_match[] = {
{ .compatible = "isl,isl29028", }, /* for backward compat., don't use */
{ .compatible = "isil,isl29028", },
{ .compatible = "isil,isl29030", },
{ },
};
MODULE_DEVICE_TABLE(of, isl29028_of_match);
static struct i2c_driver isl29028_driver = {
.driver = {
.name = "isl29028",
.pm = &isl29028_pm_ops,
.of_match_table = isl29028_of_match,
},
.probe = isl29028_probe,
.remove = isl29028_remove,
.id_table = isl29028_id,
};
module_i2c_driver(isl29028_driver);
MODULE_DESCRIPTION("ISL29028 Ambient Light and Proximity Sensor driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
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