path: root/drivers/hwmon/gl520sm.c

/*
 * gl520sm.c - Part of lm_sensors, Linux kernel modules for hardware
 *	       monitoring
 * Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>,
 *			     Kyösti Mälkki <kmalkki@cc.hut.fi>
 * Copyright (c) 2005	Maarten Deprez <maartendeprez@users.sourceforge.net>
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

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

/* Type of the extra sensor */
static unsigned short extra_sensor_type;
module_param(extra_sensor_type, ushort, 0);
MODULE_PARM_DESC(extra_sensor_type, "Type of extra sensor (0=autodetect, 1=temperature, 2=voltage)");

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };

/*
 * Many GL520 constants specified below
 * One of the inputs can be configured as either temp or voltage.
 * That's why _TEMP2 and _IN4 access the same register
 */

/* The GL520 registers */
#define GL520_REG_CHIP_ID		0x00
#define GL520_REG_REVISION		0x01
#define GL520_REG_CONF			0x03
#define GL520_REG_MASK			0x11

#define GL520_REG_VID_INPUT		0x02

static const u8 GL520_REG_IN_INPUT[]	= { 0x15, 0x14, 0x13, 0x0d, 0x0e };
static const u8 GL520_REG_IN_LIMIT[]	= { 0x0c, 0x09, 0x0a, 0x0b };
static const u8 GL520_REG_IN_MIN[]	= { 0x0c, 0x09, 0x0a, 0x0b, 0x18 };
static const u8 GL520_REG_IN_MAX[]	= { 0x0c, 0x09, 0x0a, 0x0b, 0x17 };

static const u8 GL520_REG_TEMP_INPUT[]		= { 0x04, 0x0e };
static const u8 GL520_REG_TEMP_MAX[]		= { 0x05, 0x17 };
static const u8 GL520_REG_TEMP_MAX_HYST[]	= { 0x06, 0x18 };

#define GL520_REG_FAN_INPUT		0x07
#define GL520_REG_FAN_MIN		0x08
#define GL520_REG_FAN_DIV		0x0f
#define GL520_REG_FAN_OFF		GL520_REG_FAN_DIV

#define GL520_REG_ALARMS		0x12
#define GL520_REG_BEEP_MASK		0x10
#define GL520_REG_BEEP_ENABLE		GL520_REG_CONF

/*
 * Function declarations
 */

static int gl520_probe(struct i2c_client *client,
		       const struct i2c_device_id *id);
static int gl520_detect(struct i2c_client *client, struct i2c_board_info *info);
static void gl520_init_client(struct i2c_client *client);
static int gl520_remove(struct i2c_client *client);
static int gl520_read_value(struct i2c_client *client, u8 reg);
static int gl520_write_value(struct i2c_client *client, u8 reg, u16 value);
static struct gl520_data *gl520_update_device(struct device *dev);

/* Driver data */
static const struct i2c_device_id gl520_id[] = {
	{ "gl520sm", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, gl520_id);

static struct i2c_driver gl520_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "gl520sm",
	},
	.probe		= gl520_probe,
	.remove		= gl520_remove,
	.id_table	= gl520_id,
	.detect		= gl520_detect,
	.address_list	= normal_i2c,
};

/* Client data */
struct gl520_data {
	struct device *hwmon_dev;
	struct mutex update_lock;
	char valid;		/* zero until the following fields are valid */
	unsigned long last_updated;	/* in jiffies */

	u8 vid;
	u8 vrm;
	u8 in_input[5];		/* [0] = VVD */
	u8 in_min[5];		/* [0] = VDD */
	u8 in_max[5];		/* [0] = VDD */
	u8 fan_input[2];
	u8 fan_min[2];
	u8 fan_div[2];
	u8 fan_off;
	u8 temp_input[2];
	u8 temp_max[2];
	u8 temp_max_hyst[2];
	u8 alarms;
	u8 beep_enable;
	u8 beep_mask;
	u8 alarm_mask;
	u8 two_temps;
};

/*
 * Sysfs stuff
 */

static ssize_t get_cpu_vid(struct device *dev, struct device_attribute *attr,
			   char *buf)
{
	struct gl520_data *data = gl520_update_device(dev);
	return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
}
static DEVICE_ATTR(cpu0_vid, S_IRUGO, get_cpu_vid, NULL);

#define VDD_FROM_REG(val) (((val) * 95 + 2) / 4)
#define VDD_TO_REG(val) SENSORS_LIMIT((((val) * 4 + 47) / 95), 0, 255)

#define IN_FROM_REG(val) ((val) * 19)
#define IN_TO_REG(val) SENSORS_LIMIT((((val) + 9) / 19), 0, 255)

static ssize_t get_in_input(struct device *dev, struct device_attribute *attr,
			    char *buf)
{
	int n = to_sensor_dev_attr(attr)->index;
	struct gl520_data *