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linux/drivers/misc/apds9802als.c
Linus Torvalds bf4afc53b7 Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 
This was done entirely with mindless brute force, using

    git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' |
        xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/'

to convert the new alloc_obj() users that had a simple GFP_KERNEL
argument to just drop that argument.

Note that due to the extreme simplicity of the scripting, any slightly
more complex cases spread over multiple lines would not be triggered:
they definitely exist, but this covers the vast bulk of the cases, and
the resulting diff is also then easier to check automatically.

For the same reason the 'flex' versions will be done as a separate
conversion.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2026-02-21 17:09:51 -08:00

308 lines
6.9 KiB
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// SPDX-License-Identifier: GPL-2.0-only
/*
* apds9802als.c - apds9802 ALS Driver
*
* Copyright (C) 2009 Intel Corp
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include <linux/pm_runtime.h>
#define ALS_MIN_RANGE_VAL 1
#define ALS_MAX_RANGE_VAL 2
#define POWER_STA_ENABLE 1
#define POWER_STA_DISABLE 0
#define DRIVER_NAME "apds9802als"
struct als_data {
struct mutex mutex;
};
static ssize_t als_sensing_range_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
int val;
val = i2c_smbus_read_byte_data(client, 0x81);
if (val < 0)
return val;
if (val & 1)
return sprintf(buf, "4095\n");
else
return sprintf(buf, "65535\n");
}
static int als_wait_for_data_ready(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
int ret;
int retry = 10;
do {
msleep(30);
ret = i2c_smbus_read_byte_data(client, 0x86);
} while (!(ret & 0x80) && retry--);
if (retry < 0) {
dev_warn(dev, "timeout waiting for data ready\n");
return -ETIMEDOUT;
}
return 0;
}
static ssize_t als_lux0_input_data_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct als_data *data = i2c_get_clientdata(client);
int ret_val;
int temp;
/* Protect against parallel reads */
pm_runtime_get_sync(dev);
mutex_lock(&data->mutex);
/* clear EOC interrupt status */
i2c_smbus_write_byte(client, 0x40);
/* start measurement */
temp = i2c_smbus_read_byte_data(client, 0x81);
i2c_smbus_write_byte_data(client, 0x81, temp | 0x08);
ret_val = als_wait_for_data_ready(dev);
if (ret_val < 0)
goto failed;
temp = i2c_smbus_read_byte_data(client, 0x8C); /* LSB data */
if (temp < 0) {
ret_val = temp;
goto failed;
}
ret_val = i2c_smbus_read_byte_data(client, 0x8D); /* MSB data */
if (ret_val < 0)
goto failed;
mutex_unlock(&data->mutex);
pm_runtime_put_sync(dev);
temp = (ret_val << 8) | temp;
return sprintf(buf, "%d\n", temp);
failed:
mutex_unlock(&data->mutex);
pm_runtime_put_sync(dev);
return ret_val;
}
static ssize_t als_sensing_range_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct als_data *data = i2c_get_clientdata(client);
int ret_val;
unsigned long val;
ret_val = kstrtoul(buf, 10, &val);
if (ret_val)
return ret_val;
if (val < 4096)
val = 1;
else if (val < 65536)
val = 2;
else
return -ERANGE;
pm_runtime_get_sync(dev);
/* Make sure nobody else reads/modifies/writes 0x81 while we
are active */
mutex_lock(&data->mutex);
ret_val = i2c_smbus_read_byte_data(client, 0x81);
if (ret_val < 0)
goto fail;
/* Reset the bits before setting them */
ret_val = ret_val & 0xFA;
if (val == 1) /* Setting detection range up to 4k LUX */
ret_val = (ret_val | 0x01);
else /* Setting detection range up to 64k LUX*/
ret_val = (ret_val | 0x00);
ret_val = i2c_smbus_write_byte_data(client, 0x81, ret_val);
if (ret_val >= 0) {
/* All OK */
mutex_unlock(&data->mutex);
pm_runtime_put_sync(dev);
return count;
}
fail:
mutex_unlock(&data->mutex);
pm_runtime_put_sync(dev);
return ret_val;
}
static int als_set_power_state(struct i2c_client *client, bool on_off)
{
int ret_val;
struct als_data *data = i2c_get_clientdata(client);
mutex_lock(&data->mutex);
ret_val = i2c_smbus_read_byte_data(client, 0x80);
if (ret_val < 0)
goto fail;
if (on_off)
ret_val = ret_val | 0x01;
else
ret_val = ret_val & 0xFE;
ret_val = i2c_smbus_write_byte_data(client, 0x80, ret_val);
fail:
mutex_unlock(&data->mutex);
return ret_val;
}
static DEVICE_ATTR(lux0_sensor_range, S_IRUGO | S_IWUSR,
als_sensing_range_show, als_sensing_range_store);
static DEVICE_ATTR(lux0_input, S_IRUGO, als_lux0_input_data_show, NULL);
static struct attribute *mid_att_als[] = {
&dev_attr_lux0_sensor_range.attr,
&dev_attr_lux0_input.attr,
NULL
};
static const struct attribute_group m_als_gr = {
.name = "apds9802als",
.attrs = mid_att_als
};
static int als_set_default_config(struct i2c_client *client)
{
int ret_val;
/* Write the command and then switch on */
ret_val = i2c_smbus_write_byte_data(client, 0x80, 0x01);
if (ret_val < 0) {
dev_err(&client->dev, "failed default switch on write\n");
return ret_val;
}
/* detection range: 1~64K Lux, maunal measurement */
ret_val = i2c_smbus_write_byte_data(client, 0x81, 0x08);
if (ret_val < 0)
dev_err(&client->dev, "failed default LUX on write\n");
/* We always get 0 for the 1st measurement after system power on,
* so make sure it is finished before user asks for data.
*/
als_wait_for_data_ready(&client->dev);
return ret_val;
}
static int apds9802als_probe(struct i2c_client *client)
{
int res;
struct als_data *data;
data = kzalloc_obj(struct als_data);
if (data == NULL) {
dev_err(&client->dev, "Memory allocation failed\n");
return -ENOMEM;
}
i2c_set_clientdata(client, data);
res = sysfs_create_group(&client->dev.kobj, &m_als_gr);
if (res) {
dev_err(&client->dev, "device create file failed\n");
goto als_error1;
}
dev_info(&client->dev, "ALS chip found\n");
als_set_default_config(client);
mutex_init(&data->mutex);
pm_runtime_set_active(&client->dev);
pm_runtime_enable(&client->dev);
return res;
als_error1:
kfree(data);
return res;
}
static void apds9802als_remove(struct i2c_client *client)
{
struct als_data *data = i2c_get_clientdata(client);
pm_runtime_get_sync(&client->dev);
als_set_power_state(client, false);
sysfs_remove_group(&client->dev.kobj, &m_als_gr);
pm_runtime_disable(&client->dev);
pm_runtime_set_suspended(&client->dev);
pm_runtime_put_noidle(&client->dev);
kfree(data);
}
#ifdef CONFIG_PM
static int apds9802als_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
als_set_power_state(client, false);
return 0;
}
static int apds9802als_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
als_set_power_state(client, true);
return 0;
}
static UNIVERSAL_DEV_PM_OPS(apds9802als_pm_ops, apds9802als_suspend,
apds9802als_resume, NULL);
#define APDS9802ALS_PM_OPS (&apds9802als_pm_ops)
#else /* CONFIG_PM */
#define APDS9802ALS_PM_OPS NULL
#endif /* CONFIG_PM */
static const struct i2c_device_id apds9802als_id[] = {
{ DRIVER_NAME },
{ }
};
MODULE_DEVICE_TABLE(i2c, apds9802als_id);
static struct i2c_driver apds9802als_driver = {
.driver = {
.name = DRIVER_NAME,
.pm = APDS9802ALS_PM_OPS,
},
.probe = apds9802als_probe,
.remove = apds9802als_remove,
.id_table = apds9802als_id,
};
module_i2c_driver(apds9802als_driver);
MODULE_AUTHOR("Anantha Narayanan <Anantha.Narayanan@intel.com");
MODULE_DESCRIPTION("Avago apds9802als ALS Driver");
MODULE_LICENSE("GPL v2");
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