diff options
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/i8k.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c index ee017166545..6e40072fbf6 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); } |