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linux/drivers/iio/light/pa12203001.c
Uwe Kleine-König ed5c2f5fd1 i2c: Make remove callback return void 
The value returned by an i2c driver's remove function is mostly ignored.
(Only an error message is printed if the value is non-zero that the
error is ignored.)

So change the prototype of the remove function to return no value. This
way driver authors are not tempted to assume that passing an error to
the upper layer is a good idea. All drivers are adapted accordingly.
There is no intended change of behaviour, all callbacks were prepared to
return 0 before.

Reviewed-by: Peter Senna Tschudin <peter.senna@gmail.com>
Reviewed-by: Jeremy Kerr <jk@codeconstruct.com.au>
Reviewed-by: Benjamin Mugnier <benjamin.mugnier@foss.st.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Crt Mori <cmo@melexis.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Marek Behún <kabel@kernel.org> # for leds-turris-omnia
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Machata <petrm@nvidia.com> # for mlxsw
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com> # for surface3_power
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> # for bmc150-accel-i2c + kxcjk-1013
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> # for media/* + staging/media/*
Acked-by: Miguel Ojeda <ojeda@kernel.org> # for auxdisplay/ht16k33 + auxdisplay/lcd2s
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com> # for versaclock5
Reviewed-by: Ajay Gupta <ajayg@nvidia.com> # for ucsi_ccg
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # for iio
Acked-by: Peter Rosin <peda@axentia.se> # for i2c-mux-*, max9860
Acked-by: Adrien Grassein <adrien.grassein@gmail.com> # for lontium-lt8912b
Reviewed-by: Jean Delvare <jdelvare@suse.de> # for hwmon, i2c-core and i2c/muxes
Acked-by: Corey Minyard <cminyard@mvista.com> # for IPMI
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com> # for drivers/power
Acked-by: Krzysztof Hałasa <khalasa@piap.pl>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2022-08-16 12:46:26 +02:00

488 lines
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015 Intel Corporation
*
* Driver for TXC PA12203001 Proximity and Ambient Light Sensor.
*
* To do: Interrupt support.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#define PA12203001_DRIVER_NAME "pa12203001"
#define PA12203001_REG_CFG0 0x00
#define PA12203001_REG_CFG1 0x01
#define PA12203001_REG_CFG2 0x02
#define PA12203001_REG_CFG3 0x03
#define PA12203001_REG_ADL 0x0b
#define PA12203001_REG_PDH 0x0e
#define PA12203001_REG_POFS 0x10
#define PA12203001_REG_PSET 0x11
#define PA12203001_ALS_EN_MASK BIT(0)
#define PA12203001_PX_EN_MASK BIT(1)
#define PA12203001_PX_NORMAL_MODE_MASK GENMASK(7, 6)
#define PA12203001_AFSR_MASK GENMASK(5, 4)
#define PA12203001_AFSR_SHIFT 4
#define PA12203001_PSCAN 0x03
/* als range 31000, ps, als disabled */
#define PA12203001_REG_CFG0_DEFAULT 0x30
/* led current: 100 mA */
#define PA12203001_REG_CFG1_DEFAULT 0x20
/* ps mode: normal, interrupts not active */
#define PA12203001_REG_CFG2_DEFAULT 0xcc
#define PA12203001_REG_CFG3_DEFAULT 0x00
#define PA12203001_SLEEP_DELAY_MS 3000
#define PA12203001_CHIP_ENABLE 0xff
#define PA12203001_CHIP_DISABLE 0x00
/* available scales: corresponding to [500, 4000, 7000, 31000] lux */
static const int pa12203001_scales[] = { 7629, 61036, 106813, 473029};
struct pa12203001_data {
struct i2c_client *client;
/* protect device states */
struct mutex lock;
bool als_enabled;
bool px_enabled;
bool als_needs_enable;
bool px_needs_enable;
struct regmap *map;
};
static const struct {
u8 reg;
u8 val;
} regvals[] = {
{PA12203001_REG_CFG0, PA12203001_REG_CFG0_DEFAULT},
{PA12203001_REG_CFG1, PA12203001_REG_CFG1_DEFAULT},
{PA12203001_REG_CFG2, PA12203001_REG_CFG2_DEFAULT},
{PA12203001_REG_CFG3, PA12203001_REG_CFG3_DEFAULT},
{PA12203001_REG_PSET, PA12203001_PSCAN},
};
static IIO_CONST_ATTR(in_illuminance_scale_available,
"0.007629 0.061036 0.106813 0.473029");
static struct attribute *pa12203001_attrs[] = {
&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
NULL
};
static const struct attribute_group pa12203001_attr_group = {
.attrs = pa12203001_attrs,
};
static const struct iio_chan_spec pa12203001_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 regmap_range pa12203001_volatile_regs_ranges[] = {
regmap_reg_range(PA12203001_REG_ADL, PA12203001_REG_ADL + 1),
regmap_reg_range(PA12203001_REG_PDH, PA12203001_REG_PDH),
};
static const struct regmap_access_table pa12203001_volatile_regs = {
.yes_ranges = pa12203001_volatile_regs_ranges,
.n_yes_ranges = ARRAY_SIZE(pa12203001_volatile_regs_ranges),
};
static const struct regmap_config pa12203001_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = PA12203001_REG_PSET,
.cache_type = REGCACHE_RBTREE,
.volatile_table = &pa12203001_volatile_regs,
};
static inline int pa12203001_als_enable(struct pa12203001_data *data, u8 enable)
{
int ret;
ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,
PA12203001_ALS_EN_MASK, enable);
if (ret < 0)
return ret;
data->als_enabled = !!enable;
return 0;
}
static inline int pa12203001_px_enable(struct pa12203001_data *data, u8 enable)
{
int ret;
ret = regmap_update_bits(data->map, PA12203001_REG_CFG0,
PA12203001_PX_EN_MASK, enable);
if (ret < 0)
return ret;
data->px_enabled = !!enable;
return 0;
}
static int pa12203001_set_power_state(struct pa12203001_data *data, bool on,
u8 mask)
{
#ifdef CONFIG_PM
int ret;
if (on && (mask & PA12203001_ALS_EN_MASK)) {
mutex_lock(&data->lock);
if (data->px_enabled) {
ret = pa12203001_als_enable(data,
PA12203001_ALS_EN_MASK);
if (ret < 0)
goto err;
} else {
data->als_needs_enable = true;
}
mutex_unlock(&data->lock);
}
if (on && (mask & PA12203001_PX_EN_MASK)) {
mutex_lock(&data->lock);
if (data->als_enabled) {
ret = pa12203001_px_enable(data, PA12203001_PX_EN_MASK);
if (ret < 0)
goto err;
} else {
data->px_needs_enable = true;
}
mutex_unlock(&data->lock);
}
if (on) {
ret = pm_runtime_resume_and_get(&data->client->dev);
} else {
pm_runtime_mark_last_busy(&data->client->dev);
ret = pm_runtime_put_autosuspend(&data->client->dev);
}
return ret;
err:
mutex_unlock(&data->lock);
return ret;
#endif
return 0;
}
static int pa12203001_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val,
int *val2, long mask)
{
struct pa12203001_data *data = iio_priv(indio_dev);
int ret;
u8 dev_mask;
unsigned int reg_byte;
__le16 reg_word;
switch (mask) {
case IIO_CHAN_INFO_RAW:
switch (chan->type) {
case IIO_LIGHT:
dev_mask = PA12203001_ALS_EN_MASK;
ret = pa12203001_set_power_state(data, true, dev_mask);
if (ret < 0)
return ret;
/*
* ALS ADC value is stored in registers
* PA12203001_REG_ADL and in PA12203001_REG_ADL + 1.
*/
ret = regmap_bulk_read(data->map, PA12203001_REG_ADL,
&reg_word, 2);
if (ret < 0)
goto reg_err;
*val = le16_to_cpu(reg_word);
ret = pa12203001_set_power_state(data, false, dev_mask);
if (ret < 0)
return ret;
break;
case IIO_PROXIMITY:
dev_mask = PA12203001_PX_EN_MASK;
ret = pa12203001_set_power_state(data, true, dev_mask);
if (ret < 0)
return ret;
ret = regmap_read(data->map, PA12203001_REG_PDH,
&reg_byte);
if (ret < 0)
goto reg_err;
*val = reg_byte;
ret = pa12203001_set_power_state(data, false, dev_mask);
if (ret < 0)
return ret;
break;
default:
return -EINVAL;
}
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
ret = regmap_read(data->map, PA12203001_REG_CFG0, &reg_byte);
if (ret < 0)
return ret;
*val = 0;
reg_byte = (reg_byte & PA12203001_AFSR_MASK);
*val2 = pa12203001_scales[reg_byte >> 4];
return IIO_VAL_INT_PLUS_MICRO;
default:
return -EINVAL;
}
reg_err:
pa12203001_set_power_state(data, false, dev_mask);
return ret;
}
static int pa12203001_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int val,
int val2, long mask)
{
struct pa12203001_data *data = iio_priv(indio_dev);
int i, ret, new_val;
unsigned int reg_byte;
switch (mask) {
case IIO_CHAN_INFO_SCALE:
ret = regmap_read(data->map, PA12203001_REG_CFG0, &reg_byte);
if (val != 0 || ret < 0)
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(pa12203001_scales); i++) {
if (val2 == pa12203001_scales[i]) {
new_val = i << PA12203001_AFSR_SHIFT;
return regmap_update_bits(data->map,
PA12203001_REG_CFG0,
PA12203001_AFSR_MASK,
new_val);
}
}
break;
default:
break;
}
return -EINVAL;
}
static const struct iio_info pa12203001_info = {
.read_raw = pa12203001_read_raw,
.write_raw = pa12203001_write_raw,
.attrs = &pa12203001_attr_group,
};
static int pa12203001_init(struct iio_dev *indio_dev)
{
struct pa12203001_data *data = iio_priv(indio_dev);
int i, ret;
for (i = 0; i < ARRAY_SIZE(regvals); i++) {
ret = regmap_write(data->map, regvals[i].reg, regvals[i].val);
if (ret < 0)
return ret;
}
return 0;
}
static int pa12203001_power_chip(struct iio_dev *indio_dev, u8 state)
{
struct pa12203001_data *data = iio_priv(indio_dev);
int ret;
mutex_lock(&data->lock);
ret = pa12203001_als_enable(data, state);
if (ret < 0)
goto out;
ret = pa12203001_px_enable(data, state);
out:
mutex_unlock(&data->lock);
return ret;
}
static int pa12203001_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct pa12203001_data *data;
struct iio_dev *indio_dev;
int ret;
indio_dev = devm_iio_device_alloc(&client->dev,
sizeof(struct pa12203001_data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->client = client;
data->map = devm_regmap_init_i2c(client, &pa12203001_regmap_config);
if (IS_ERR(data->map))
return PTR_ERR(data->map);
mutex_init(&data->lock);
indio_dev->info = &pa12203001_info;
indio_dev->name = PA12203001_DRIVER_NAME;
indio_dev->channels = pa12203001_channels;
indio_dev->num_channels = ARRAY_SIZE(pa12203001_channels);
indio_dev->modes = INDIO_DIRECT_MODE;
ret = pa12203001_init(indio_dev);
if (ret < 0)
return ret;
ret = pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);
if (ret < 0)
return ret;
ret = pm_runtime_set_active(&client->dev);
if (ret < 0)
goto out_err;
pm_runtime_enable(&client->dev);
pm_runtime_set_autosuspend_delay(&client->dev,
PA12203001_SLEEP_DELAY_MS);
pm_runtime_use_autosuspend(&client->dev);
ret = iio_device_register(indio_dev);
if (ret < 0)
goto out_err;
return 0;
out_err:
pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
return ret;
}
static void pa12203001_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
int ret;
iio_device_unregister(indio_dev);
pm_runtime_disable(&client->dev);
pm_runtime_set_suspended(&client->dev);
ret = pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
if (ret)
dev_warn(&client->dev, "Failed to power down (%pe)\n",
ERR_PTR(ret));
}
#if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM)
static int pa12203001_suspend(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
return pa12203001_power_chip(indio_dev, PA12203001_CHIP_DISABLE);
}
#endif
#ifdef CONFIG_PM_SLEEP
static int pa12203001_resume(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
return pa12203001_power_chip(indio_dev, PA12203001_CHIP_ENABLE);
}
#endif
#ifdef CONFIG_PM
static int pa12203001_runtime_resume(struct device *dev)
{
struct pa12203001_data *data;
data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
mutex_lock(&data->lock);
if (data->als_needs_enable) {
pa12203001_als_enable(data, PA12203001_ALS_EN_MASK);
data->als_needs_enable = false;
}
if (data->px_needs_enable) {
pa12203001_px_enable(data, PA12203001_PX_EN_MASK);
data->px_needs_enable = false;
}
mutex_unlock(&data->lock);
return 0;
}
#endif
static const struct dev_pm_ops pa12203001_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(pa12203001_suspend, pa12203001_resume)
SET_RUNTIME_PM_OPS(pa12203001_suspend, pa12203001_runtime_resume, NULL)
};
static const struct acpi_device_id pa12203001_acpi_match[] = {
{ "TXCPA122", 0 },
{}
};
MODULE_DEVICE_TABLE(acpi, pa12203001_acpi_match);
static const struct i2c_device_id pa12203001_id[] = {
{ "txcpa122", 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, pa12203001_id);
static struct i2c_driver pa12203001_driver = {
.driver = {
.name = PA12203001_DRIVER_NAME,
.pm = &pa12203001_pm_ops,
.acpi_match_table = ACPI_PTR(pa12203001_acpi_match),
},
.probe = pa12203001_probe,
.remove = pa12203001_remove,
.id_table = pa12203001_id,
};
module_i2c_driver(pa12203001_driver);
MODULE_AUTHOR("Adriana Reus <adriana.reus@intel.com>");
MODULE_DESCRIPTION("Driver for TXC PA12203001 Proximity and Light Sensor");
MODULE_LICENSE("GPL v2");
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