linux-imx

/*

 * via-cputemp.c - Driver for VIA CPU core temperature monitoring

 * Copyright (C) 2009 VIA Technologies, Inc.

 *

 * based on existing coretemp.c, which is

 *

 * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>

 *

 * 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 of the License.

 *

 * 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.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/module.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/hwmon.h>

#include <linux/hwmon-vid.h>

#include <linux/sysfs.h>

#include <linux/hwmon-sysfs.h>

#include <linux/err.h>

#include <linux/mutex.h>

#include <linux/list.h>

#include <linux/platform_device.h>

#include <linux/cpu.h>

#include <asm/msr.h>

#include <asm/processor.h>

#include <asm/cpu_device_id.h>

​

#define DRVNAME "via_cputemp"

​

enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };

​

/*

 * Functions declaration

 */

​

struct via_cputemp_data {

    struct device *hwmon_dev;

    const char *name;

    u8 vrm;

    u32 id;

    u32 msr_temp;

    u32 msr_vid;

};

​

/*

 * Sysfs stuff

 */

​

static ssize_t name_show(struct device *dev, struct device_attribute *devattr,

             char *buf)

{

    int ret;

    struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

    struct via_cputemp_data *data = dev_get_drvdata(dev);

​

    if (attr->index == SHOW_NAME)

        ret = sprintf(buf, "%s\n", data->name);

    else    /* show label */

        ret = sprintf(buf, "Core %d\n", data->id);

    return ret;

}

​

static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,

             char *buf)

{

    struct via_cputemp_data *data = dev_get_drvdata(dev);

    u32 eax, edx;

    int err;

​

    err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);

    if (err)

        return -EAGAIN;

​

    return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000);

}

​

static ssize_t cpu0_vid_show(struct device *dev,

                 struct device_attribute *devattr, char *buf)