linux-imx

/*

 * w83l786ng.c - Linux kernel driver for hardware monitoring

 * Copyright (c) 2007 Kevin Lo <kevlo@kevlo.org>

 *

 * 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.

 *

 * 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., 51 Franklin Street, Fifth Floor, Boston, MA

 * 02110-1301 USA.

 */

​

/*

 * Supports following chips:

 *

 * Chip     #vin    #fanin  #pwm    #temp   wchipid vendid  i2c ISA

 * w83l786ng    3   2   2   2   0x7b    0x5ca3  yes no

 */

​

#include <linux/module.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/i2c.h>

#include <linux/hwmon.h>

#include <linux/hwmon-vid.h>

#include <linux/hwmon-sysfs.h>

#include <linux/err.h>

#include <linux/mutex.h>

#include <linux/jiffies.h>

​

/* Addresses to scan */

static const unsigned short normal_i2c[] = { 0x2e, 0x2f, I2C_CLIENT_END };

​

/* Insmod parameters */

​

static bool reset;

module_param(reset, bool, 0);

MODULE_PARM_DESC(reset, "Set to 1 to reset chip, not recommended");

​

#define W83L786NG_REG_IN_MIN(nr)    (0x2C + (nr) * 2)

#define W83L786NG_REG_IN_MAX(nr)    (0x2B + (nr) * 2)

#define W83L786NG_REG_IN(nr)        ((nr) + 0x20)

​

#define W83L786NG_REG_FAN(nr)       ((nr) + 0x28)

#define W83L786NG_REG_FAN_MIN(nr)   ((nr) + 0x3B)

​

#define W83L786NG_REG_CONFIG        0x40

#define W83L786NG_REG_ALARM1        0x41

#define W83L786NG_REG_ALARM2        0x42

#define W83L786NG_REG_GPIO_EN       0x47

#define W83L786NG_REG_MAN_ID2       0x4C

#define W83L786NG_REG_MAN_ID1       0x4D

#define W83L786NG_REG_CHIP_ID       0x4E

​

#define W83L786NG_REG_DIODE     0x53

#define W83L786NG_REG_FAN_DIV       0x54

#define W83L786NG_REG_FAN_CFG       0x80

​

#define W83L786NG_REG_TOLERANCE     0x8D

​

static const u8 W83L786NG_REG_TEMP[2][3] = {

    { 0x25,     /* TEMP 0 in DataSheet */

      0x35,     /* TEMP 0 Over in DataSheet */

      0x36 },   /* TEMP 0 Hyst in DataSheet */

    { 0x26,     /* TEMP 1 in DataSheet */

      0x37,     /* TEMP 1 Over in DataSheet */

      0x38 }    /* TEMP 1 Hyst in DataSheet */

};

​

static const u8 W83L786NG_PWM_MODE_SHIFT[] = {6, 7};

static const u8 W83L786NG_PWM_ENABLE_SHIFT[] = {2, 4};

​

/* FAN Duty Cycle, be used to control */

static const u8 W83L786NG_REG_PWM[] = {0x81, 0x87};

​

​

static inline u8

FAN_TO_REG(long rpm, int div)

{

    if (rpm == 0)

        return 255;

    rpm = clamp_val(rpm, 1, 1000000);

    return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);

}

​