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|
/*
* max6639.c - Support for Maxim MAX6639
*
* 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller
*
* Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
*
* based on the initial MAX6639 support from semptian.net
* by He Changqing <hechangqing@semptian.com>
*
* 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/err.h>
#include <linux/mutex.h>
#include <linux/i2c/max6639.h>
/* Addresses to scan */
static unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END };
/* The MAX6639 registers, valid channel numbers: 0, 1 */
#define MAX6639_REG_TEMP(ch) (0x00 + (ch))
#define MAX6639_REG_STATUS 0x02
#define MAX6639_REG_OUTPUT_MASK 0x03
#define MAX6639_REG_GCONFIG 0x04
#define MAX6639_REG_TEMP_EXT(ch) (0x05 + (ch))
#define MAX6639_REG_ALERT_LIMIT(ch) (0x08 + (ch))
#define MAX6639_REG_OT_LIMIT(ch) (0x0A + (ch))
#define MAX6639_REG_THERM_LIMIT(ch) (0x0C + (ch))
#define MAX6639_REG_FAN_CONFIG1(ch) (0x10 + (ch) * 4)
#define MAX6639_REG_FAN_CONFIG2a(ch) (0x11 + (ch) * 4)
#define MAX6639_REG_FAN_CONFIG2b(ch) (0x12 + (ch) * 4)
#define MAX6639_REG_FAN_CONFIG3(ch) (0x13 + (ch) * 4)
#define MAX6639_REG_FAN_CNT(ch) (0x20 + (ch))
#define MAX6639_REG_TARGET_CNT(ch) (0x22 + (ch))
#define MAX6639_REG_FAN_PPR(ch) (0x24 + (ch))
#define MAX6639_REG_TARGTDUTY(ch) (0x26 + (ch))
#define MAX6639_REG_FAN_START_TEMP(ch) (0x28 + (ch))
#define MAX6639_REG_DEVID 0x3D
#define MAX6639_REG_MANUID 0x3E
#define MAX6639_REG_DEVREV 0x3F
/* Register bits */
#define MAX6639_GCONFIG_STANDBY 0x80
#define MAX6639_GCONFIG_POR 0x40
#define MAX6639_GCONFIG_DISABLE_TIMEOUT 0x20
#define MAX6639_GCONFIG_CH2_LOCAL 0x10
#define MAX6639_GCONFIG_PWM_FREQ_HI 0x08
#define MAX6639_FAN_CONFIG1_PWM 0x80
#define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED 0x40
static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 };
#define FAN_FROM_REG(val, rpm_range) ((val) == 0 || (val) == 255 ? \
0 : (rpm_ranges[rpm_range] * 30) / (val))
#define TEMP_LIMIT_TO_REG(val) clamp_val((val) / 1000, 0, 255)
/*
* Client data (each client gets its own)
*/
struct max6639_data {
struct i2c_client *client;
struct mutex update_lock;
char valid; /* !=0 if following fields are valid */
unsigned long last_updated; /* In jiffies */
/* Register values sampled regularly */
u16 temp[2]; /* Temperature, in 1/8 C, 0..255 C */
bool temp_fault[2]; /* Detected temperature diode failure */
u8 fan[2]; /* Register value: TACH count for fans >=30 */
u8 status; /* Detected channel alarms and fan failures */
/* Register values only written to */
u8 pwm[2]; /* Register value: Duty cycle 0..120 */
u8 temp_therm[2]; /* THERM Temperature, 0..255 C (->_max) */
u8 temp_alert[2]; /* ALERT Temperature, 0..255 C (->_crit) */
u8 temp_ot[2]; /* OT Temperature, 0..255 C (->_emergency) */
/* Register values initialized only once */
u8 ppr; /* Pulses per rotation 0..3 for 1..4 ppr */
u8 rpm_range; /* Index in above rpm_ranges table */
};
static struct max6639_data *max6639_update_device(struct device *dev)
{
struct max6639_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
struct max6639_data *ret = data;
int i;
int status_reg;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
int res;
dev_dbg(&client->dev, "Starting max6639 update\n");
status_reg = i2c_smbus_read_byte_data(client,
MAX6639_REG_STATUS);
if (status_reg < 0) {
ret = ERR_PTR(status_reg);
goto abort;
}
data->status = status_reg;
for (i = 0; i < 2; i++) {
res = i2c_smbus_read_byte_data(client,
MAX6639_REG_FAN_CNT(i));
if (res < 0) {
ret = ERR_PTR(res);
goto abort;
}
data->fan[i] = res;
res = i2c_smbus_read_byte_data(client,
MAX6639_REG_TEMP_EXT(i));
if (res < 0) {
ret = ERR_PTR(res);
goto abort;
}
data->temp[i] = res >> 5;
data->temp_fault[i] = res & 0x01;
res = i2c_smbus_read_byte_data(client,
MAX6639_REG_TEMP(i));
if (res < 0) {
ret = ERR_PTR(res);
goto abort;
}
data->temp[i] |= res << 3;
}
data->last_updated = jiffies;
data->valid = 1;
}
abort:
mutex_unlock(&data->update_lock);
return ret;
}
static ssize_t show_temp_input(struct device *dev,
struct device_attribute *dev_attr, char *buf)
{
long temp;
struct max6639_data *data = max6639_update_device(dev);
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
if (IS_ERR(data))
return PTR_ERR(data);
temp = data->temp[attr->index] * 125;
return sprintf(buf, "%ld\n", temp);
}
static ssize_t show_temp_fault(struct device *dev,
struct device_attribute *dev_attr, char *buf)
{
struct max6639_data *data = max6639_update_device(dev);
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
if (IS_ERR(data))
return PTR_ERR(data);
return sprintf(buf, "%d\n", data->temp_fault[attr->index]);
}
static ssize_t show_temp_max(struct device *dev,
struct device_attribute *dev_attr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct max6639_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000));
}
static ssize_t set_temp_max(struct device *dev,
struct device_attribute *dev_attr,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct max6639_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
unsigned long val;
int res;
res = kstrtoul(buf, 10, &val);
if (res)
return res;
mutex_lock(&data->update_lock);
data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val);
i2c_smbus_write_byte_data(client,
MAX6639_REG_THERM_LIMIT(attr->index),
data->temp_therm[attr->index]);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_temp_crit(struct device *dev,
struct device_attribute *dev_attr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct max6639_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000));
}
static ssize_t set_temp_crit(struct device *dev,
|