linux-imx

/*

 *  pc87427.c - hardware monitoring driver for the

 *              National Semiconductor PC87427 Super-I/O chip

 *  Copyright (C) 2006, 2008, 2010  Jean Delvare <jdelvare@suse.de>

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License version 2 as

 *  published by the Free Software Foundation.

 *

 *  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.

 *

 *  Supports the following chips:

 *

 *  Chip        #vin    #fan    #pwm    #temp   devid

 *  PC87427     -       8       4       6       0xF2

 *

 *  This driver assumes that no more than one chip is present.

 *  Only fans are fully supported so far. Temperatures are in read-only

 *  mode, and voltages aren't supported at all.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/module.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/jiffies.h>

#include <linux/platform_device.h>

#include <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>

#include <linux/err.h>

#include <linux/mutex.h>

#include <linux/sysfs.h>

#include <linux/ioport.h>

#include <linux/acpi.h>

#include <linux/io.h>

​

static unsigned short force_id;

module_param(force_id, ushort, 0);

MODULE_PARM_DESC(force_id, "Override the detected device ID");

​

static struct platform_device *pdev;

​

#define DRVNAME "pc87427"

​

/*

 * The lock mutex protects both the I/O accesses (needed because the

 * device is using banked registers) and the register cache (needed to keep

 * the data in the registers and the cache in sync at any time).

 */

struct pc87427_data {

    struct device *hwmon_dev;

    struct mutex lock;

    int address[2];

    const char *name;

​

    unsigned long last_updated; /* in jiffies */

    u8 fan_enabled;         /* bit vector */

    u16 fan[8];         /* register values */

    u16 fan_min[8];         /* register values */