linux-imx

/*

 * emc2103.c - Support for SMSC EMC2103

 * Copyright (c) 2010 SMSC

 *

 * 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>

​

/* Addresses scanned */

static const unsigned short normal_i2c[] = { 0x2E, I2C_CLIENT_END };

​

static const u8 REG_TEMP[4] = { 0x00, 0x02, 0x04, 0x06 };

static const u8 REG_TEMP_MIN[4] = { 0x3c, 0x38, 0x39, 0x3a };

static const u8 REG_TEMP_MAX[4] = { 0x34, 0x30, 0x31, 0x32 };

​

#define REG_CONF1       0x20

#define REG_TEMP_MAX_ALARM  0x24

#define REG_TEMP_MIN_ALARM  0x25

#define REG_FAN_CONF1       0x42

#define REG_FAN_TARGET_LO   0x4c

#define REG_FAN_TARGET_HI   0x4d

#define REG_FAN_TACH_HI     0x4e

#define REG_FAN_TACH_LO     0x4f

#define REG_PRODUCT_ID      0xfd

#define REG_MFG_ID      0xfe

​

/* equation 4 from datasheet: rpm = (3932160 * multipler) / count */

#define FAN_RPM_FACTOR      3932160

​

/*

 * 2103-2 and 2103-4's 3rd temperature sensor can be connected to two diodes

 * in anti-parallel mode, and in this configuration both can be read

 * independently (so we have 4 temperature inputs).  The device can't

 * detect if it's connected in this mode, so we have to manually enable

 * it.  Default is to leave the device in the state it's already in (-1).

 * This parameter allows APD mode to be optionally forced on or off

 */

static int apd = -1;

module_param(apd, bint, 0);

MODULE_PARM_DESC(apd, "Set to zero to disable anti-parallel diode mode");

​

struct temperature {