From: Corentin Chary <corentincj@xxxxxxxxxx>
Adds an hwmon interface to control the fan.
Signed-off-by: Corentin Chary <corentincj@xxxxxxxxxx>
---
Kconfig | 1
eeepc-laptop.c | 147 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 148 insertions(+)
--- a/drivers/misc/eeepc-laptop.c 2008-03-11 10:37:04.000000000 +0100
+++ b/drivers/misc/eeepc-laptop.c 2008-03-11 18:42:51.000000000 +0100
@@ -23,6 +23,8 @@
#include <linux/platform_device.h>
#include <linux/backlight.h>
#include <linux/fb.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
#include <acpi/acpi_drivers.h>
#include <acpi/acpi_bus.h>
#include <asm/uaccess.h>
@@ -103,6 +105,15 @@
"CRDS", NULL
};
+#define EEEPC_EC "\\_SB.PCI0.SBRG.EC0."
+
+#define EEEPC_EC_FAN_PWM EEEPC_EC "SC02" /* Fan PWM duty cycle (%) */
+#define EEEPC_EC_SC02 0x63
+#define EEEPC_EC_FAN_HRPM EEEPC_EC "SC05" /* High byte, fan speed (RPM) */
+#define EEEPC_EC_FAN_LRPM EEEPC_EC "SC06" /* Low byte, fan speed (RPM) */
+#define EEEPC_EC_FAN_CTRL EEEPC_EC "SFB3" /* Byte containing SF25 */
+#define EEEPC_EC_SFB3 0xD3
+
/*
* This is the main structure, we can use it to store useful information
* about the hotk device
@@ -154,6 +165,9 @@
/* The backlight device /sys/class/backlight */
static struct backlight_device *eeepc_backlight_device;
+/* The hwmon device */
+static struct device *eeepc_hwmon_device;
+
/*
* The backlight class declaration
*/
@@ -429,6 +443,100 @@
}
/*
+ * Hwmon
+ */
+static int eeepc_get_fan_pwm(void)
+{
+ int value = 0;
+
+ read_acpi_int(NULL, EEEPC_EC_FAN_PWM, &value);
+ return (value);
+}
+
+static void eeepc_set_fan_pwm(int value)
+{
+ value = SENSORS_LIMIT(value, 0, 100);
+ ec_write(EEEPC_EC_SC02, value);
+}
+
+static int eeepc_get_fan_rpm(void)
+{
+ int high = 0;
+ int low = 0;
+
+ read_acpi_int(NULL, EEEPC_EC_FAN_HRPM, &high);
+ read_acpi_int(NULL, EEEPC_EC_FAN_LRPM, &low);
+ return (high << 8 | low);
+}
+
+static int eeepc_get_fan_ctrl(void)
+{
+ int value = 0;
+
+ read_acpi_int(NULL, EEEPC_EC_FAN_CTRL, &value);
+ return ((value & 0x02 ? 1 : 0));
+}
+
+static void eeepc_set_fan_ctrl(int manual)
+{
+ int value = 0;
+
+ read_acpi_int(NULL, EEEPC_EC_FAN_CTRL, &value);
+ if (manual)
+ value |= 0x02;
+ else
+ value &= ~0x02;
+ ec_write(EEEPC_EC_SFB3, value);
+}
+
+static ssize_t store_sys_hwmon(void (*set)(int), const char *buf, size_t count)
+{
+ int rv, value;
+
+ rv = parse_arg(buf, count, &value);
+ if (rv > 0)
+ set(value);
+ return rv;
+}
+
+static ssize_t show_sys_hwmon(int (*get)(void), char *buf)
+{
+ return sprintf(buf, "%d\n", get());
+}
+
+#define EEEPC_CREATE_SENSOR_ATTR(_name, _mode, _set, _get) \
+ static ssize_t show_##_name(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+ { \
+ return show_sys_hwmon(_set, buf); \
+ } \
+ static ssize_t store_##_name(struct device *dev, \
+ struct device_attribute *attr, \
+ const char *buf, size_t count) \
+ { \
+ return store_sys_hwmon(_get, buf, count); \
+ } \
+ static SENSOR_DEVICE_ATTR(_name, _mode, show_##_name, store_##_name, 0);
+
+EEEPC_CREATE_SENSOR_ATTR(fan1_input, S_IRUGO, eeepc_get_fan_rpm, NULL);
+EEEPC_CREATE_SENSOR_ATTR(fan1_pwm, S_IRUGO | S_IWUSR,
+ eeepc_get_fan_pwm, eeepc_set_fan_pwm);
+EEEPC_CREATE_SENSOR_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
+ eeepc_get_fan_ctrl, eeepc_set_fan_ctrl);
+
+static struct attribute *hwmon_attributes[] = {
+ &sensor_dev_attr_fan1_pwm.dev_attr.attr,
+ &sensor_dev_attr_fan1_input.dev_attr.attr,
+ &sensor_dev_attr_pwm1_enable.dev_attr.attr,
+ NULL
+};
+
+static struct attribute_group hwmon_attribute_group = {
+ .attrs = hwmon_attributes
+};
+
+/*
* exit/init
*/
static void eeepc_backlight_exit(void)
@@ -438,9 +546,23 @@
eeepc_backlight_device = NULL;
}
+static void eeepc_hwmon_exit(void)
+{
+ struct device *hwmon;
+
+ hwmon = eeepc_hwmon_device;
+ if (!hwmon)
+ return ;
+ hwmon_device_unregister(hwmon);
+ sysfs_remove_group(&hwmon->kobj,
+ &hwmon_attribute_group);
+ eeepc_hwmon_device = NULL;
+}
+
static void __exit eeepc_laptop_exit(void)
{
eeepc_backlight_exit();
+ eeepc_hwmon_exit();
acpi_bus_unregister_driver(&eeepc_hotk_driver);
sysfs_remove_group(&platform_device->dev.kobj,
&platform_attribute_group);
@@ -468,6 +590,26 @@
return 0;
}
+static int eeepc_hwmon_init(struct device *dev)
+{
+ struct device *hwmon;
+ int result;
+
+ hwmon = hwmon_device_register(dev);
+ if (IS_ERR(hwmon)) {
+ printk(EEEPC_ERR
+ "Could not register eeepc hwmon device\n");
+ eeepc_hwmon_device = NULL;
+ return PTR_ERR(hwmon);
+ }
+ eeepc_hwmon_device = hwmon;
+ result = sysfs_create_group(&hwmon->kobj,
+ &hwmon_attribute_group);
+ if (result)
+ eeepc_hwmon_exit();
+ return result;
+}
+
static int __init eeepc_laptop_init(void)
{
struct device *dev;
@@ -486,6 +628,9 @@
result = eeepc_backlight_init(dev);
if (result)
goto fail_backlight;
+ result = eeepc_hwmon_init(dev);
+ if (result)
+ goto fail_hwmon;
/* Register platform stuff */
result = platform_driver_register(&platform_driver);
if (result)
@@ -510,6 +655,8 @@
fail_platform_device1:
platform_driver_unregister(&platform_driver);
fail_platform_driver:
+ eeepc_hwmon_exit();
+fail_hwmon:
eeepc_backlight_exit();
fail_backlight:
return result;
--- a/drivers/misc/Kconfig 2008-03-11 18:43:26.000000000 +0100
+++ b/drivers/misc/Kconfig 2008-03-11 18:38:51.000000000 +0100
@@ -237,6 +237,7 @@
depends on X86
depends on ACPI
depends on BACKLIGHT_CLASS_DEVICE
+ depends on HWMON
depends on EXPERIMENTAL
---help---
This driver supports the Fn-Fx keys on Eee PC laptops.
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