gl520sm.c

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/*
    gl520sm.c - Part of lm_sensors, Linux kernel modules for hardware
                monitoring
    Copyright (c) 1998, 1999  Frodo Looijaard <[e-mail]>,
                              Kyösti Mälkki <[e-mail]>
    Copyright (c) 2005        Maarten Deprez <[e-mail]>

    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-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 unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };

/* Insmod parameters */
I2C_CLIENT_INSMOD_1(gl520sm);

/* 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

#define GL520_REG_IN0_INPUT		0x15
#define GL520_REG_IN0_LIMIT		0x0c
#define GL520_REG_IN0_MIN		GL520_REG_IN0_LIMIT
#define GL520_REG_IN0_MAX		GL520_REG_IN0_LIMIT

#define GL520_REG_IN1_INPUT		0x14
#define GL520_REG_IN1_LIMIT		0x09
#define GL520_REG_IN1_MIN		GL520_REG_IN1_LIMIT
#define GL520_REG_IN1_MAX		GL520_REG_IN1_LIMIT

#define GL520_REG_IN2_INPUT		0x13
#define GL520_REG_IN2_LIMIT		0x0a
#define GL520_REG_IN2_MIN		GL520_REG_IN2_LIMIT
#define GL520_REG_IN2_MAX		GL520_REG_IN2_LIMIT

#define GL520_REG_IN3_INPUT		0x0d
#define GL520_REG_IN3_LIMIT		0x0b
#define GL520_REG_IN3_MIN		GL520_REG_IN3_LIMIT
#define GL520_REG_IN3_MAX		GL520_REG_IN3_LIMIT

#define GL520_REG_IN4_INPUT		0x0e
#define GL520_REG_IN4_MAX		0x17
#define GL520_REG_IN4_MIN		0x18

#define GL520_REG_TEMP1_INPUT		0x04
#define GL520_REG_TEMP1_MAX		0x05
#define GL520_REG_TEMP1_MAX_HYST	0x06

#define GL520_REG_TEMP2_INPUT		0x0e
#define GL520_REG_TEMP2_MAX		0x17
#define GL520_REG_TEMP2_MAX_HYST	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_attach_adapter(struct i2c_adapter *adapter);
static int gl520_detect(struct i2c_adapter *adapter, int address, int kind);
static void gl520_init_client(struct i2c_client *client);
static int gl520_detach_client(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 struct i2c_driver gl520_driver = {
	.driver = {
		.name	= "gl520sm",
	},
	.id		= I2C_DRIVERID_GL520,
	.attach_adapter	= gl520_attach_adapter,
	.detach_client	= gl520_detach_client,
};

/* Client data */
struct gl520_data {
	struct i2c_client client;
	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
 */

#define sysfs_r(type, n, item, reg) \
static ssize_t get_##type##item (struct gl520_data *, char *, int); \
static ssize_t get_##type##n##item (struct device *, struct device_attribute *attr, char *); \
static ssize_t get_##type##n##item (struct device *dev, struct device_attribute *attr, char *buf) \
{ \
	struct gl520_data *data = gl520_update_device(dev); \
	return get_##type##item(data, buf, (n)); \
}

#define sysfs_w(type, n, item, reg) \
static ssize_t set_##type##item (struct i2c_client *, struct gl520_data *, const char *, size_t, int, int); \
static ssize_t set_##type##n##item (struct device *, struct device_attribute *attr, const char *, size_t); \
static ssize_t set_##type##n##item (struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \
{ \
	struct i2c_client *client = to_i2c_client(dev); \
	struct gl520_data *data = i2c_get_clientdata(client); \
	return set_##type##item(client, data, buf, count, (n), reg); \
}

#define sysfs_rw_n(type, n, item, reg) \
sysfs_r(type, n, item, reg) \
sysfs_w(type, n, item, reg) \
static DEVICE_ATTR(type##n##item, S_IRUGO | S_IWUSR, get_##type##n##item, set_##type##n##item);

#define sysfs_ro_n(type, n, item, reg) \
sysfs_r(type, n, item, reg) \
static DEVICE_ATTR(type##n##item, S_IRUGO, get_##type##n##item, NULL);

#define sysfs_rw(type, item, reg) \
sysfs_r(type, 0, item, reg) \
sysfs_w(type, 0, item, reg) \
static DEVICE_ATTR(type##item, S_IRUGO | S_IWUSR, get_##type##0##item, set_##type##0##item);

#define sysfs_ro(type, item, reg) \
sysfs_r(type, 0, item, reg) \
static DEVICE_ATTR(type##item, S_IRUGO, get_##type##0##item, NULL);


#define sysfs_vid(n) \
sysfs_ro_n(cpu, n, _vid, GL520_REG_VID_INPUT)

#define sysfs_in(n) \
sysfs_ro_n(in, n, _input, GL520_REG_IN##n##INPUT) \
sysfs_rw_n(in, n, _min, GL520_REG_IN##n##_MIN) \
sysfs_rw_n(in, n, _max, GL520_REG_IN##n##_MAX) \

#define sysfs_fan(n) \
sysfs_ro_n(fan, n, _input, GL520_REG_FAN_INPUT) \
sysfs_rw_n(fan, n, _min, GL520_REG_FAN_MIN) \
sysfs_rw_n(fan, n, _div, GL520_REG_FAN_DIV)

#define sysfs_fan_off(n) \
sysfs_rw_n(fan, n, _off, GL520_REG_FAN_OFF) \

#define sysfs_temp(n) \
sysfs_ro_n(temp, n, _input, GL520_REG_TEMP##n##_INPUT) \
sysfs_rw_n(temp, n, _max, GL520_REG_TEMP##n##_MAX) \
sysfs_rw_n(temp, n, _max_hyst, GL520_REG_TEMP##n##_MAX_HYST)

#define sysfs_alarms() \
sysfs_ro(alarms, , GL520_REG_ALARMS) \
sysfs_rw(beep_enable, , GL520_REG_BEEP_ENABLE) \
sysfs_rw(beep_mask, , GL520_REG_BEEP_MASK)


sysfs_vid(0)

sysfs_in(0)
sysfs_in(1)
sysfs_in(2)
sysfs_in(3)
sysfs_in(4)

sysfs_fan(1)
sysfs_fan(2)
sysfs_fan_off(1)

sysfs_temp(1)
sysfs_temp(2)

sysfs_alarms()


static ssize_t get_cpu_vid(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
}

#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 gl520_data *data, char *buf, int n)
{
	u8 r = data->in_input[n];

	if (n == 0)
		return sprintf(buf, "%d\n", VDD_FROM_REG(r));
	else
		return sprintf(buf, "%d\n", IN_FROM_REG(r));
}

static ssize_t get_in_min(struct gl520_data *data, char *buf, int n)
{
	u8 r = data->in_min[n];

	if (n == 0)
		return sprintf(buf, "%d\n", VDD_FROM_REG(r));
	else
		return sprintf(buf, "%d\n", IN_FROM_REG(r));
}

static ssize_t get_in_max(struct gl520_data *data, char *buf, int n)
{
	u8 r = data->in_max[n];

	if (n == 0)
		return sprintf(buf, "%d\n", VDD_FROM_REG(r));
	else
		return sprintf(buf, "%d\n", IN_FROM_REG(r));
}

static ssize_t set_in_min(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	long v = simple_strtol(buf, NULL, 10);
	u8 r;

	mutex_lock(&data->update_lock);

	if (n == 0)
		r = VDD_TO_REG(v);
	else
		r = IN_TO_REG(v);

	data->in_min[n] = r;

	if (n < 4)
		gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff) | r);
	else
		gl520_write_value(client, reg, r);

	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t set_in_max(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	long v = simple_strtol(buf, NULL, 10);
	u8 r;

	if (n == 0)
		r = VDD_TO_REG(v);
	else
		r = IN_TO_REG(v);

	mutex_lock(&data->update_lock);

	data->in_max[n] = r;

	if (n < 4)
		gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff00) | (r << 8));
	else
		gl520_write_value(client, reg, r);

	mutex_unlock(&data->update_lock);
	return count;
}

#define DIV_FROM_REG(val) (1 << (val))
#define FAN_FROM_REG(val,div) ((val)==0 ? 0 : (480000/((val) << (div))))
#define FAN_TO_REG(val,div) ((val)<=0?0:SENSORS_LIMIT((480000 + ((val) << ((div)-1))) / ((val) << (div)), 1, 255));

static ssize_t get_fan_input(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_input[n - 1], data->fan_div[n - 1]));
}

static ssize_t get_fan_min(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[n - 1], data->fan_div[n - 1]));
}

static ssize_t get_fan_div(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[n - 1]));
}

static ssize_t get_fan_off(struct gl520_data *data, char *buf, int n)
{
	return sprintf(buf, "%d\n", data->fan_off);
}

static ssize_t set_fan_min(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	unsigned long v = simple_strtoul(buf, NULL, 10);
	u8 r;

	mutex_lock(&data->update_lock);
	r = FAN_TO_REG(v, data->fan_div[n - 1]);
	data->fan_min[n - 1] = r;

	if (n == 1)
		gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff00) | (r << 8));
	else
		gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xff) | r);

	data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
	if (data->fan_min[n - 1] == 0)
		data->alarm_mask &= (n == 1) ? ~0x20 : ~0x40;
	else
		data->alarm_mask |= (n == 1) ? 0x20 : 0x40;
	data->beep_mask &= data->alarm_mask;
	gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);

	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t set_fan_div(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	unsigned long v = simple_strtoul(buf, NULL, 10);
	u8 r;

	switch (v) {
	case 1: r = 0; break;
	case 2: r = 1; break;
	case 4: r = 2; break;
	case 8: r = 3; break;
	default:
		dev_err(&client->dev, "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n", v);
		return -EINVAL;
	}

	mutex_lock(&data->update_lock);
	data->fan_div[n - 1] = r;

	if (n == 1)
		gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0xc0) | (r << 6));
	else
		gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x30) | (r << 4));

	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t set_fan_off(struct i2c_client *client, struct gl520_data *data, const char *buf, size_t count, int n, int reg)
{
	u8 r = simple_strtoul(buf, NULL, 10)?1:0;

	mutex_lock(&data->update_lock);
	data->fan_off = r;
	gl520_write_value(client, reg, (gl520_read_value(client, reg) & ~0x0c) | (r << 2));
	mutex_unlock(&data->update_lock);
	return count;