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path: root/drivers/staging/mfld-sensors/apds9802ps.c
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/*
 * apds9802ps.c - Avago  Proximity Sensor Driver
 *
 * Copyright (C) 2009 Intel Corp
 *
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include <linux/hwmon-sysfs.h>

MODULE_AUTHOR("Anantha Narayanan <Anantha.Narayanan@intel.com");
MODULE_DESCRIPTION("Avago apds9802ps Proximity Driver");
MODULE_LICENSE("GPL v2");

#define POWER_STA_ENABLE 1
#define POWER_STA_DISABLE 0

#define DRIVER_NAME "i2c_apds9802ps"

struct ps_data{
	struct device *hwmon_dev;
	bool needresume;
	struct mutex write_lock;
};
static ssize_t ps_proximity_output_data_show(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	unsigned int ret_val = 0;
	unsigned int tempv1, tempv2;

	tempv1 = i2c_smbus_read_byte_data(client, 0x85); /* LSB data */
	if (tempv1 < 0)
	    printk(KERN_WARNING " apds9802ps: failed proximity out read LSB\n");
	tempv2 = i2c_smbus_read_byte_data(client, 0x86); /* MSB data */
	if (tempv2 < 0)
	    printk(KERN_WARNING " apds9802ps: failed proximity out read MSB\n");
	ret_val = (tempv2 << 8 | tempv1);
	return sprintf(buf, "%d\n", ret_val);
}
static ssize_t ps_power_status_show(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	int ret_val;

	ret_val = i2c_smbus_read_byte_data(client, 0x80);
	if (ret_val < 0)
	    printk(KERN_WARNING " apds9802ps: failed power status read MSB\n");
    ret_val = ret_val & 0x01;
	return sprintf(buf, "%d\n", ret_val);
}
static void ps_set_power_state(struct i2c_client *client, bool on_off)
{
	char curr_val = 0;
	struct ps_data *data = i2c_get_clientdata(client);

	mutex_lock(&data->write_lock);
	curr_val = i2c_smbus_read_byte_data(client, 0x80);
	if (on_off)
		curr_val = curr_val | 0x01;
	else
		curr_val = curr_val & 0xFE;
	if (i2c_smbus_write_byte_data(client, 0x80, curr_val) < 0)
	    printk(KERN_WARNING " apds9802ps: failed power state write\n");
	mutex_unlock(&data->write_lock);
}
static ssize_t ps_power_status_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct ps_data *data = i2c_get_clientdata(client);
	unsigned long val = 0;

	if (strict_strtoul(buf, 10, &val))
		return -EINVAL;

	if (val == POWER_STA_ENABLE) {
		ps_set_power_state(client, true);
		data->needresume = true;
	} else if (val == POWER_STA_DISABLE) {
		ps_set_power_state(client, false);
		data->needresume = false;
	} else
		return -EINVAL;
	return count;
}
static DEVICE_ATTR(proximity_output, S_IRUGO, ps_proximity_output_data_show, NULL);
static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR,
	ps_power_status_show, ps_power_status_store);

static struct attribute *mid_att_ps[] = {
	&dev_attr_proximity_output.attr,
	&dev_attr_power_state.attr,
	NULL
};

static struct attribute_group m_ps_gr = {
	.name = "apds9802ps",
	.attrs = mid_att_ps
};
static void ps_set_default_config(struct i2c_client *client)
{
	/*Power ON */
	if (i2c_smbus_write_byte_data(client, 0x80, 0x01) < 0)
	    printk(KERN_WARNING " apds9802ps: failed default power on write\n");
	/* 20 pulses, 100Khz Pulse frequency*/
	if (i2c_smbus_write_byte_data(client, 0x81, 0x86) < 0)
	    printk(KERN_WARNING " apds9802ps: failed pulse frequency write\n");
	/*Enable measurement, 100MA LED current*/
	if (i2c_smbus_write_byte_data(client, 0x82, 0x28) < 0)
	    printk(KERN_WARNING " apds9802ps: failed enable measurement write\n");
}
static int  apds9802ps_probe(struct i2c_client *client,
					const struct i2c_device_id *id)
{
	int res;
	struct ps_data *data;

	data = kzalloc(sizeof(struct ps_data), GFP_KERNEL);
	if (data == NULL) {
		printk(KERN_WARNING " apds9802ps: Memory initialization failed");
		return -ENOMEM;
	}
	i2c_set_clientdata(client, data);

	res = sysfs_create_group(&client->dev.kobj, &m_ps_gr);
	if (res) {
		printk(KERN_WARNING "apds9802ps: device create file failed!!\n");
		goto ps_error1;
	}
	dev_info(&client->dev, "%s apds9802ps:chipfound\n", client->name);
	ps_set_default_config(client);
	data->needresume = true;
	mutex_init(&data->write_lock);
	return res;

ps_error1:
	i2c_set_clientdata(client, NULL);
	kfree(data);
	return res;
}

static int apds9802ps_remove(struct i2c_client *client)
{
	struct ps_data *data = i2c_get_clientdata(client);

	sysfs_remove_group(&client->dev.kobj, &m_ps_gr);
	kfree(data);
	return 0;
}
static int apds9802ps_suspend(struct i2c_client *client, pm_message_t mesg)
{
	ps_set_power_state(client, false);
	return 0;
}
static int apds9802ps_resume(struct i2c_client *client)
{
	struct ps_data *data = i2c_get_clientdata(client);
	if (data->needresume == true)
		ps_set_power_state(client, true);
	return 0;
}
static struct i2c_device_id apds9802ps_id[] = {
	{ DRIVER_NAME, 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, apds9802ps_id);

static struct i2c_driver apds9802ps_driver = {
	.driver = {
		.name = DRIVER_NAME,
		.owner = THIS_MODULE,
		.bus = &i2c_bus_type,
	},
	.probe = apds9802ps_probe,
	.remove = apds9802ps_remove,
	.suspend = apds9802ps_suspend,
	.resume = apds9802ps_resume,
	.id_table = apds9802ps_id,
};

static int __init sensor_apds9802ps_init(void)
{
	int res;
	res = i2c_add_driver(&apds9802ps_driver);
	return res;
}

static void  __exit sensor_apds9802ps_exit(void)
{
	i2c_del_driver(&apds9802ps_driver);
}

module_init(sensor_apds9802ps_init);
module_exit(sensor_apds9802ps_exit);