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i8k: Integrate with the hwmon subsystem
Let i8k create an hwmon class device so that libsensors will expose the CPU temperature and fan speeds to monitoring applications. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Massimo Dal Zotto <dz@debian.org>
This commit is contained in:
Jean Delvare
Jean Delvare
parent
9c084dae5d
commit
949a9d7002
@ -917,6 +917,7 @@ config TOSHIBA
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config I8K
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tristate "Dell laptop support"
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select HWMON
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---help---
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This adds a driver to safely access the System Management Mode
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of the CPU on the Dell Inspiron 8000. The System Management Mode
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@ -5,6 +5,9 @@
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*
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* Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org>
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*
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* Hwmon integration:
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* Copyright (C) 2011 Jean Delvare <khali@linux-fr.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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@ -24,6 +27,8 @@
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#include <linux/dmi.h>
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#include <linux/capability.h>
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#include <linux/mutex.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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@ -58,6 +63,7 @@
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static DEFINE_MUTEX(i8k_mutex);
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static char bios_version[4];
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static struct device *i8k_hwmon_dev;
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MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
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MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
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@ -455,6 +461,152 @@ static int i8k_open_fs(struct inode *inode, struct file *file)
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return single_open(file, i8k_proc_show, NULL);
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}
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/*
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* Hwmon interface
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*/
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static ssize_t i8k_hwmon_show_temp(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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int cpu_temp;
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cpu_temp = i8k_get_temp(0);
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if (cpu_temp < 0)
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return cpu_temp;
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return sprintf(buf, "%d\n", cpu_temp * 1000);
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}
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static ssize_t i8k_hwmon_show_fan(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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int index = to_sensor_dev_attr(devattr)->index;
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int fan_speed;
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fan_speed = i8k_get_fan_speed(index);
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if (fan_speed < 0)
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return fan_speed;
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return sprintf(buf, "%d\n", fan_speed);
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}
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static ssize_t i8k_hwmon_show_label(struct device *dev,
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struct device_attribute *devattr,
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char *buf)
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{
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static const char *labels[4] = {
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"i8k",
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"CPU",
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"Left Fan",
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"Right Fan",
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};
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int index = to_sensor_dev_attr(devattr)->index;
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return sprintf(buf, "%s\n", labels[index]);
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}
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static DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL);
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static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
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I8K_FAN_LEFT);
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static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
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I8K_FAN_RIGHT);
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static SENSOR_DEVICE_ATTR(name, S_IRUGO, i8k_hwmon_show_label, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_label, NULL, 1);
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static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_label, NULL, 2);
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static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_label, NULL, 3);
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static void i8k_hwmon_remove_files(struct device *dev)
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{
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device_remove_file(dev, &dev_attr_temp1_input);
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device_remove_file(dev, &sensor_dev_attr_fan1_input.dev_attr);
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device_remove_file(dev, &sensor_dev_attr_fan2_input.dev_attr);
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device_remove_file(dev, &sensor_dev_attr_temp1_label.dev_attr);
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device_remove_file(dev, &sensor_dev_attr_fan1_label.dev_attr);
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device_remove_file(dev, &sensor_dev_attr_fan2_label.dev_attr);
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device_remove_file(dev, &sensor_dev_attr_name.dev_attr);
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}
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static int __init i8k_init_hwmon(void)
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{
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int err;
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i8k_hwmon_dev = hwmon_device_register(NULL);
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if (IS_ERR(i8k_hwmon_dev)) {
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err = PTR_ERR(i8k_hwmon_dev);
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i8k_hwmon_dev = NULL;
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printk(KERN_ERR "i8k: hwmon registration failed (%d)\n", err);
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return err;
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}
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/* Required name attribute */
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err = device_create_file(i8k_hwmon_dev,
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&sensor_dev_attr_name.dev_attr);
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if (err)
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goto exit_unregister;
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/* CPU temperature attributes, if temperature reading is OK */
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err = i8k_get_temp(0);
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if (err < 0) {
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dev_dbg(i8k_hwmon_dev,
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"Not creating temperature attributes (%d)\n", err);
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} else {
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err = device_create_file(i8k_hwmon_dev, &dev_attr_temp1_input);
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if (err)
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goto exit_remove_files;
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err = device_create_file(i8k_hwmon_dev,
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&sensor_dev_attr_temp1_label.dev_attr);
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if (err)
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goto exit_remove_files;
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}
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/* Left fan attributes, if left fan is present */
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err = i8k_get_fan_status(I8K_FAN_LEFT);
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if (err < 0) {
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dev_dbg(i8k_hwmon_dev,
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"Not creating %s fan attributes (%d)\n", "left", err);
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} else {
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err = device_create_file(i8k_hwmon_dev,
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&sensor_dev_attr_fan1_input.dev_attr);
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if (err)
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goto exit_remove_files;
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err = device_create_file(i8k_hwmon_dev,
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&sensor_dev_attr_fan1_label.dev_attr);
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if (err)
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goto exit_remove_files;
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}
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/* Right fan attributes, if right fan is present */
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err = i8k_get_fan_status(I8K_FAN_RIGHT);
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if (err < 0) {
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dev_dbg(i8k_hwmon_dev,
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"Not creating %s fan attributes (%d)\n", "right", err);
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} else {
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err = device_create_file(i8k_hwmon_dev,
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&sensor_dev_attr_fan2_input.dev_attr);
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if (err)
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goto exit_remove_files;
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err = device_create_file(i8k_hwmon_dev,
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&sensor_dev_attr_fan2_label.dev_attr);
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if (err)
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goto exit_remove_files;
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}
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return 0;
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exit_remove_files:
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i8k_hwmon_remove_files(i8k_hwmon_dev);
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exit_unregister:
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hwmon_device_unregister(i8k_hwmon_dev);
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return err;
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}
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static void __exit i8k_exit_hwmon(void)
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{
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i8k_hwmon_remove_files(i8k_hwmon_dev);
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hwmon_device_unregister(i8k_hwmon_dev);
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}
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static struct dmi_system_id __initdata i8k_dmi_table[] = {
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{
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.ident = "Dell Inspiron",
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@ -580,6 +732,7 @@ static int __init i8k_probe(void)
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static int __init i8k_init(void)
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{
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struct proc_dir_entry *proc_i8k;
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int err;
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/* Are we running on an supported laptop? */
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if (i8k_probe())
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@ -590,15 +743,24 @@ static int __init i8k_init(void)
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if (!proc_i8k)
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return -ENOENT;
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err = i8k_init_hwmon();
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if (err)
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goto exit_remove_proc;
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printk(KERN_INFO
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"Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n",
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I8K_VERSION);
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return 0;
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exit_remove_proc:
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remove_proc_entry("i8k", NULL);
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return err;
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}
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static void __exit i8k_exit(void)
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{
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i8k_exit_hwmon();
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remove_proc_entry("i8k", NULL);
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}
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