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authorJean Delvare <khali@linux-fr.org>2011-05-25 20:43:33 +0200
committerJean Delvare <khali@endymion.delvare>2011-05-25 20:43:33 +0200
commit949a9d70020defd7c241607ab3ed037ea88f551c (patch)
treeb366a24968110e94f0ef753558be3b9d8cbbf7b3
parent9c084dae5dc7ae0039e330230e70f2a5956e566a (diff)
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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>
-rw-r--r--arch/x86/Kconfig1
-rw-r--r--drivers/char/i8k.c162
2 files changed, 163 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 880fcb6c86f4..dcf25b71f6d7 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -917,6 +917,7 @@ config TOSHIBA
config I8K
tristate "Dell laptop support"
+ select HWMON
---help---
This adds a driver to safely access the System Management Mode
of the CPU on the Dell Inspiron 8000. The System Management Mode
diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
index ee017166545e..6e40072fbf67 100644
--- a/drivers/char/i8k.c
+++ b/drivers/char/i8k.c
@@ -5,6 +5,9 @@
*
* Copyright (C) 2001 Massimo Dal Zotto <dz@debian.org>
*
+ * Hwmon integration:
+ * Copyright (C) 2011 Jean Delvare <khali@linux-fr.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; either version 2, or (at your option) any
@@ -24,6 +27,8 @@
#include <linux/dmi.h>
#include <linux/capability.h>
#include <linux/mutex.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@@ -58,6 +63,7 @@
static DEFINE_MUTEX(i8k_mutex);
static char bios_version[4];
+static struct device *i8k_hwmon_dev;
MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
@@ -455,6 +461,152 @@ static int i8k_open_fs(struct inode *inode, struct file *file)
return single_open(file, i8k_proc_show, NULL);
}
+
+/*
+ * Hwmon interface
+ */
+
+static ssize_t i8k_hwmon_show_temp(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ int cpu_temp;
+
+ cpu_temp = i8k_get_temp(0);
+ if (cpu_temp < 0)
+ return cpu_temp;
+ return sprintf(buf, "%d\n", cpu_temp * 1000);
+}
+
+static ssize_t i8k_hwmon_show_fan(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ int index = to_sensor_dev_attr(devattr)->index;
+ int fan_speed;
+
+ fan_speed = i8k_get_fan_speed(index);
+ if (fan_speed < 0)
+ return fan_speed;
+ return sprintf(buf, "%d\n", fan_speed);
+}
+
+static ssize_t i8k_hwmon_show_label(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ static const char *labels[4] = {
+ "i8k",
+ "CPU",
+ "Left Fan",
+ "Right Fan",
+ };
+ int index = to_sensor_dev_attr(devattr)->index;
+
+ return sprintf(buf, "%s\n", labels[index]);
+}
+
+static DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL);
+static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
+ I8K_FAN_LEFT);
+static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
+ I8K_FAN_RIGHT);
+static SENSOR_DEVICE_ATTR(name, S_IRUGO, i8k_hwmon_show_label, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_label, NULL, 1);
+static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_label, NULL, 2);
+static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_label, NULL, 3);
+
+static void i8k_hwmon_remove_files(struct device *dev)
+{
+ device_remove_file(dev, &dev_attr_temp1_input);
+ device_remove_file(dev, &sensor_dev_attr_fan1_input.dev_attr);
+ device_remove_file(dev, &sensor_dev_attr_fan2_input.dev_attr);
+ device_remove_file(dev, &sensor_dev_attr_temp1_label.dev_attr);
+ device_remove_file(dev, &sensor_dev_attr_fan1_label.dev_attr);
+ device_remove_file(dev, &sensor_dev_attr_fan2_label.dev_attr);
+ device_remove_file(dev, &sensor_dev_attr_name.dev_attr);
+}
+
+static int __init i8k_init_hwmon(void)
+{
+ int err;
+
+ i8k_hwmon_dev = hwmon_device_register(NULL);
+ if (IS_ERR(i8k_hwmon_dev)) {
+ err = PTR_ERR(i8k_hwmon_dev);
+ i8k_hwmon_dev = NULL;
+ printk(KERN_ERR "i8k: hwmon registration failed (%d)\n", err);
+ return err;
+ }
+
+ /* Required name attribute */
+ err = device_create_file(i8k_hwmon_dev,
+ &sensor_dev_attr_name.dev_attr);
+ if (err)
+ goto exit_unregister;
+
+ /* CPU temperature attributes, if temperature reading is OK */
+ err = i8k_get_temp(0);
+ if (err < 0) {
+ dev_dbg(i8k_hwmon_dev,
+ "Not creating temperature attributes (%d)\n", err);
+ } else {
+ err = device_create_file(i8k_hwmon_dev, &dev_attr_temp1_input);
+ if (err)
+ goto exit_remove_files;
+ err = device_create_file(i8k_hwmon_dev,
+ &sensor_dev_attr_temp1_label.dev_attr);
+ if (err)
+ goto exit_remove_files;
+ }
+
+ /* Left fan attributes, if left fan is present */
+ err = i8k_get_fan_status(I8K_FAN_LEFT);
+ if (err < 0) {
+ dev_dbg(i8k_hwmon_dev,
+ "Not creating %s fan attributes (%d)\n", "left", err);
+ } else {
+ err = device_create_file(i8k_hwmon_dev,
+ &sensor_dev_attr_fan1_input.dev_attr);
+ if (err)
+ goto exit_remove_files;
+ err = device_create_file(i8k_hwmon_dev,
+ &sensor_dev_attr_fan1_label.dev_attr);
+ if (err)
+ goto exit_remove_files;
+ }
+
+ /* Right fan attributes, if right fan is present */
+ err = i8k_get_fan_status(I8K_FAN_RIGHT);
+ if (err < 0) {
+ dev_dbg(i8k_hwmon_dev,
+ "Not creating %s fan attributes (%d)\n", "right", err);
+ } else {
+ err = device_create_file(i8k_hwmon_dev,
+ &sensor_dev_attr_fan2_input.dev_attr);
+ if (err)
+ goto exit_remove_files;
+ err = device_create_file(i8k_hwmon_dev,
+ &sensor_dev_attr_fan2_label.dev_attr);
+ if (err)
+ goto exit_remove_files;
+ }
+
+ return 0;
+
+ exit_remove_files:
+ i8k_hwmon_remove_files(i8k_hwmon_dev);
+ exit_unregister:
+ hwmon_device_unregister(i8k_hwmon_dev);
+ return err;
+}
+
+static void __exit i8k_exit_hwmon(void)
+{
+ i8k_hwmon_remove_files(i8k_hwmon_dev);
+ hwmon_device_unregister(i8k_hwmon_dev);
+}
+
static struct dmi_system_id __initdata i8k_dmi_table[] = {
{
.ident = "Dell Inspiron",
@@ -580,6 +732,7 @@ static int __init i8k_probe(void)
static int __init i8k_init(void)
{
struct proc_dir_entry *proc_i8k;
+ int err;
/* Are we running on an supported laptop? */
if (i8k_probe())
@@ -590,15 +743,24 @@ static int __init i8k_init(void)
if (!proc_i8k)
return -ENOENT;
+ err = i8k_init_hwmon();
+ if (err)
+ goto exit_remove_proc;
+
printk(KERN_INFO
"Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n",
I8K_VERSION);
return 0;
+
+ exit_remove_proc:
+ remove_proc_entry("i8k", NULL);
+ return err;
}
static void __exit i8k_exit(void)
{
+ i8k_exit_hwmon();
remove_proc_entry("i8k", NULL);
}