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/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that 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.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/ctype.h>
#include <linux/rwsem.h>
#include <linux/sensors.h>
static struct class *sensors_class;
DECLARE_RWSEM(sensors_list_lock);
LIST_HEAD(sensors_list);
static ssize_t sensors_name_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%s\n", sensors_cdev->name);
}
static ssize_t sensors_vendor_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%s\n", sensors_cdev->vendor);
}
static ssize_t sensors_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%d\n", sensors_cdev->version);
}
static ssize_t sensors_handle_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%d\n", sensors_cdev->handle);
}
static ssize_t sensors_type_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%d\n", sensors_cdev->type);
}
static ssize_t sensors_max_range_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%s\n", sensors_cdev->max_range);
}
static ssize_t sensors_resolution_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%s\n", sensors_cdev->resolution);
}
static ssize_t sensors_power_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%s\n", sensors_cdev->sensor_power);
}
static ssize_t sensors_min_delay_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%d\n", sensors_cdev->min_delay);
}
static ssize_t sensors_fifo_event_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%d\n",
sensors_cdev->fifo_reserved_event_count);
}
static ssize_t sensors_fifo_max_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%d\n",
sensors_cdev->fifo_max_event_count);
}
static ssize_t sensors_enable_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
ssize_t ret = -EINVAL;
unsigned long data = 0;
ret = kstrtoul(buf, 10, &data);
if (ret)
return ret;
if (data > 1) {
dev_err(dev, "Invalid value of input, input=%ld\n", data);
return -EINVAL;
}
if (sensors_cdev->sensors_enable == NULL) {
dev_err(dev, "Invalid sensor class enable handle\n");
return -EINVAL;
}
ret = sensors_cdev->sensors_enable(sensors_cdev, data);
if (ret)
return ret;
sensors_cdev->enabled = data;
return size;
}
static ssize_t sensors_enable_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%u\n",
sensors_cdev->enabled);
}
static ssize_t sensors_delay_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
ssize_t ret = -EINVAL;
unsigned long data = 0;
ret = kstrtoul(buf, 10, &data);
if (ret)
return ret;
/* The data unit is millisecond, the min_delay unit is microseconds. */
if ((data * 1000) < sensors_cdev->min_delay) {
dev_err(dev, "Invalid value of delay, delay=%ld\n", data);
return -EINVAL;
}
if (sensors_cdev->sensors_poll_delay == NULL) {
dev_err(dev, "Invalid sensor class delay handle\n");
return -EINVAL;
}
ret = sensors_cdev->sensors_poll_delay(sensors_cdev, data);
if (ret)
return ret;
sensors_cdev->delay_msec = data;
return size;
}
static ssize_t sensors_delay_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%u\n",
sensors_cdev->delay_msec);
}
static struct device_attribute sensors_class_attrs[] = {
__ATTR(name, 0444, sensors_name_show, NULL),
__ATTR(vendor, 0444, sensors_vendor_show, NULL),
__ATTR(version, 0444, sensors_version_show, NULL),
__ATTR(handle, 0444, sensors_handle_show, NULL),
__ATTR(type, 0444, sensors_type_show, NULL),
__ATTR(max_range, 0444, sensors_max_range_show, NULL),
__ATTR(resolution, 0444, sensors_resolution_show, NULL),
__ATTR(sensor_power, 0444, sensors_power_show, NULL),
__ATTR(min_delay, 0444, sensors_min_delay_show, NULL),
__ATTR(fifo_reserved_event_count, 0444, sensors_fifo_event_show, NULL),
__ATTR(fifo_max_event_count, 0444, sensors_fifo_max_show, NULL),
__ATTR(enable, 0664, sensors_enable_show, sensors_enable_store),
__ATTR(poll_delay, 0664, sensors_delay_show, sensors_delay_store),
__ATTR_NULL,
};
/**
* sensors_classdev_register - register a new object of sensors_classdev class.
* @parent: The device to register.
* @sensors_cdev: the sensors_classdev structure for this device.
*/
int sensors_classdev_register(struct device *parent,
struct sensors_classdev *sensors_cdev)
{
sensors_cdev->dev = device_create(sensors_class, parent, 0,
sensors_cdev, "%s", sensors_cdev->name);
if (IS_ERR(sensors_cdev->dev))
return PTR_ERR(sensors_cdev->dev);
down_write(&sensors_list_lock);
list_add_tail(&sensors_cdev->node, &sensors_list);
up_write(&sensors_list_lock);
pr_debug("Registered sensors device: %s\n",
sensors_cdev->name);
return 0;
}
EXPORT_SYMBOL(sensors_classdev_register);
/**
* sensors_classdev_unregister - unregister a object of sensors class.
* @sensors_cdev: the sensor device to unregister
* Unregister a previously registered via sensors_classdev_register object.
*/
void sensors_classdev_unregister(struct sensors_classdev *sensors_cdev)
{
device_unregister(sensors_cdev->dev);
down_write(&sensors_list_lock);
list_del(&sensors_cdev->node);
up_write(&sensors_list_lock);
}
EXPORT_SYMBOL(sensors_classdev_unregister);
static int __init sensors_init(void)
{
sensors_class = class_create(THIS_MODULE, "sensors");
if (IS_ERR(sensors_class))
return PTR_ERR(sensors_class);
sensors_class->dev_attrs = sensors_class_attrs;
return 0;
}
static void __exit sensors_exit(void)
{
class_destroy(sensors_class);
}
subsys_initcall(sensors_init);
module_exit(sensors_exit);
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