Re: [PATCH] Acer Aspire One Fan Control
From: Peter Feuerer
Date: Sat May 02 2009 - 17:22:06 EST
Hi,
here's a new patch, compiled and tested with current linus git state, what's
your opinion about it?
cheers,
--peter
Acerhdf is a driver for Acer Aspire One netbooks. It allows to access
the temperature sensor and to control the fan.
Signed-off-by: Peter Feuerer <peter@xxxxxxxx>
diff --git a/MAINTAINERS b/MAINTAINERS
index ef03abe..0fc8f06 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -222,6 +222,13 @@ L: linux-acenic@xxxxxxxxxx
S: Maintained
F: drivers/net/acenic*
+ACER ASPIRE ONE TEMPERATURE AND FAN DRIVER
+P: Peter Feuerer
+M: peter@xxxxxxxx
+W: http://piie.net/?section=acerhdf
+S: Maintained
+F: drivers/platform/x86/acerhdf.c
+
ACER WMI LAPTOP EXTRAS
P: Carlos Corbacho
M: carlos@xxxxxxxxxxxxxxxxxxx
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 284ebac..c4fce42 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -34,6 +34,24 @@ config ACER_WMI
If you have an ACPI-WMI compatible Acer/ Wistron laptop, say Y or M
here.
+config ACERHDF
+ tristate "Acer Aspire One temperature and fan driver"
+ depends on THERMAL && THERMAL_HWMON
+ ---help---
+ This is a driver for Acer Aspire One netbooks. It allows to access
+ the temperature sensor and to control the fan.
+
+ The driver is started in "user-mode" where the Bios takes care about
+ controlling the fan, unless a userspace program controls it.
+ To let the module handle the fan, do:
+ echo kernel > /sys/class/thermal/thermal_zone0/mode
+
+ For more information about this driver see
+ <http://piie.net/files/acerhdf_README.txt>
+
+ If you have an Acer Aspire One netbook, say Y or M
+ here.
+
config ASUS_LAPTOP
tristate "Asus Laptop Extras (EXPERIMENTAL)"
depends on ACPI
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index e40c7bd..641b8bf 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_COMPAL_LAPTOP) += compal-laptop.o
obj-$(CONFIG_DELL_LAPTOP) += dell-laptop.o
obj-$(CONFIG_DELL_WMI) += dell-wmi.o
obj-$(CONFIG_ACER_WMI) += acer-wmi.o
+obj-$(CONFIG_ACERHDF) += acerhdf.o
obj-$(CONFIG_HP_WMI) += hp-wmi.o
obj-$(CONFIG_TC1100_WMI) += tc1100-wmi.o
obj-$(CONFIG_SONY_LAPTOP) += sony-laptop.o
diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
new file mode 100644
index 0000000..9da4223
--- /dev/null
+++ b/drivers/platform/x86/acerhdf.c
@@ -0,0 +1,501 @@
+/*
+ * acerhdf - A kernelmodule which monitors the temperature
+ * of the aspire one netbook, turns on/off the fan
+ * as soon as the upper/lower threshold is reached.
+ *
+ * (C) 2009 - Peter Feuerer peter (a) piie.net
+ * http://piie.net
+ *
+ *
+ *
+ * Inspired by and many thanks to:
+ * o acerfand - Rachel Greenham
+ * o acer_ec.pl - Michael Kurz michi.kurz (at) googlemail.com
+ * - Petr Tomasek tomasek (#) etf,cuni,cz
+ * - Carlos Corbacho cathectic (at) gmail.com
+ *
+ *
+ * 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 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/dmi.h>
+#include <acpi/acpi_drivers.h>
+#include <linux/sched.h>
+#include <linux/thermal.h>
+#include <linux/platform_device.h>
+
+/* if you want the module to be started in kernelmode,
+ * uncomment following line */
+/* #define START_IN_KERNEL_MODE */
+
+#define VERSION "0.5.1"
+/* Referring the atom spec, are 99 degree Celsius ok. So critical
+ * temperature is 89 degree Celsius to prevent hardware damage */
+#define ACERHDF_TEMP_CRIT 89
+#define ACERHDF_FAN_AUTO 1
+#define ACERHDF_FAN_OFF 0
+/* No matter what value the user puts into the fanon variable, turn on the fan
+ * at 80 degree Celsius to prevent hardware damage */
+#define ACERHDF_MAX_FANON 80
+#define ACERHDF_ERROR -0xffff
+#define K_NOTICE KERN_NOTICE "acerhdf: "
+#define K_ERR KERN_ERR "acerhdf: "
+
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Peter Feuerer");
+MODULE_DESCRIPTION("Aspire One temperature and fan driver");
+MODULE_ALIAS("dmi:*:*Acer*:*:");
+MODULE_ALIAS("dmi:*:*Gateway*:*:");
+MODULE_ALIAS("dmi:*:*Packard Bell*:*:");
+
+/* global variables */
+
+#ifdef START_IN_KERNEL_MODE
+static int kernelmode = 1;
+#else /* START_IN_KERNEL_MODE */
+static int kernelmode;
+#endif /* START_IN_KERNEL_MODE */
+
+static int interval = 10;
+static int fanon = 67;
+static int fanoff = 62;
+static int verbose;
+static int fanstate = 1;
+static int disable_kernelmode;
+static int bios_version = -1;
+static char force_bios[16];
+static int prev_interval;
+struct thermal_zone_device *acerhdf_thz_dev;
+struct thermal_cooling_device *acerhdf_cool_dev;
+
+/* module parameters */
+module_param(kernelmode, int, 0);
+MODULE_PARM_DESC(kernelmode, "Kernel mode on / off");
+module_param(interval, int, 0600);
+MODULE_PARM_DESC(interval, "Polling interval of temperature check");
+module_param(fanon, int, 0600);
+MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature");
+module_param(fanoff, int, 0600);
+MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature");
+module_param(verbose, int, 0600);
+MODULE_PARM_DESC(verbose, "Enable verbose dmesg outputs");
+module_param_string(force_bios, force_bios, 16, 0);
+MODULE_PARM_DESC(force_bios, "Force bios version and omit bios check");
+
+/* bios settings */
+/**********************************************************************/
+struct bios_settings_t {
+ const char *vendor;
+ const char *version;
+ unsigned char fanreg;
+ unsigned char tempreg;
+ unsigned char cmd_off;
+ unsigned char cmd_auto;
+};
+
+/* some bios versions have different commands and
+ * maybe also different register addresses */
+static const struct bios_settings_t bios_settings[] = {
+ {"Acer", "v0.3109", 0x55, 0x58, 0x1f, 0x00},
+ {"Acer", "v0.3114", 0x55, 0x58, 0x1f, 0x00},
+ {"Acer", "v0.3301", 0x55, 0x58, 0xaf, 0x00},
+ {"Acer", "v0.3304", 0x55, 0x58, 0xaf, 0x00},
+ {"Acer", "v0.3305", 0x55, 0x58, 0xaf, 0x00},
+ {"Acer", "v0.3308", 0x55, 0x58, 0x21, 0x00},
+ {"Acer", "v0.3309", 0x55, 0x58, 0x21, 0x00},
+ {"Gateway", "v0.3103", 0x55, 0x58, 0x21, 0x00},
+ {"Packard Bell", "v0.3105", 0x55, 0x58, 0x21, 0x00},
+ {"", 0, 0, 0, 0, 0}
+};
+
+
+/* acer ec functions */
+/**********************************************************************/
+/* return temperature */
+static int acerhdf_get_temp(void)
+{
+ u8 temp;
+ /* read temperature */
+ if (!ec_read(bios_settings[bios_version].tempreg, &temp)) {
+ if (verbose)
+ printk(K_NOTICE "temp %d\n", temp);
+ return temp;
+ }
+ return ACERHDF_ERROR;
+}
+
+/* return state of the fan */
+static int acerhdf_get_fanstate(void)
+{
+ u8 fan;
+ if (!ec_read(bios_settings[bios_version].fanreg, &fan))
+ return (fan == bios_settings[bios_version].cmd_off) ?
+ ACERHDF_FAN_OFF : ACERHDF_FAN_AUTO;
+
+ return ACERHDF_ERROR;
+}
+
+/* switch on/off the fan */
+static void acerhdf_change_fanstate(int state)
+{
+ unsigned char cmd;
+ if (verbose)
+ printk(K_NOTICE "fan %s\n", (state) ? "ON" : "OFF");
+
+ cmd = (state) ? bios_settings[bios_version].cmd_auto :
+ bios_settings[bios_version].cmd_off;
+
+ ec_write(bios_settings[bios_version].fanreg, cmd);
+
+ fanstate = (state) ? ACERHDF_FAN_AUTO : ACERHDF_FAN_OFF;
+}
+
+/* helpers */
+/**********************************************************************/
+/* check if parameters have changed */
+static void acerhdf_check_param(struct thermal_zone_device *thermal)
+{
+ if (fanon > ACERHDF_MAX_FANON) {
+ printk(K_ERR "fanon temperature too high, set to %d\n",
+ ACERHDF_MAX_FANON);
+ fanon = ACERHDF_MAX_FANON;
+ }
+ if (kernelmode && prev_interval != interval) {
+ if (verbose)
+ printk(K_NOTICE "interval changed to: %d\n",
+ interval);
+ thermal->polling_delay = interval*1000;
+ prev_interval = interval;
+ }
+}
+
+/* thermal zone callback functions */
+/**********************************************************************/
+/* return temperature */
+static int get_ec_temp(struct thermal_zone_device *thermal, unsigned long *t)
+{
+ int temp;
+
+ /* check if parameters have changed */
+ acerhdf_check_param(thermal);
+
+ /* return temperature */
+ temp = acerhdf_get_temp();
+ if (temp == ACERHDF_ERROR)
+ return -EINVAL;
+
+ *t = temp;
+ return 0;
+}
+
+/* bind the cooling device to the thermal zone */
+static int bind(struct thermal_zone_device *thermal,
+ struct thermal_cooling_device *cdev)
+{
+ /* if the cooling device is the one from acerhdf bind it */
+ if (cdev == acerhdf_cool_dev) {
+ if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) {
+ printk(K_ERR "error binding cooling dev\n");
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+/* unbind cooling device from thermal zone */
+static int unbind(struct thermal_zone_device *thermal,
+ struct thermal_cooling_device *cdev)
+{
+ if (cdev == acerhdf_cool_dev) {
+ if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
+ printk(K_ERR "acerhdf: error unbinding cooling dev\n");
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+/* current operation mode - kernel / user */
+static int get_mode(struct thermal_zone_device *thermal,
+ enum thermal_device_mode *mode)
+{
+ if (verbose)
+ printk(K_NOTICE "kernelmode %d\n", kernelmode);
+
+ *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED :
+ THERMAL_DEVICE_DISABLED;
+
+ return 0;
+}
+
+/* set operation mode;
+ * kernel: the thermal layer of the kernel takes care about
+ * the temperature and the fan.
+ * user: the BIOS takes control of the fan until a userspace
+ * tool does.
+ */
+static int set_mode(struct thermal_zone_device *thermal,
+ enum thermal_device_mode mode)
+{
+ if (mode == THERMAL_DEVICE_DISABLED) {
+ if (verbose)
+ printk(K_NOTICE "kernelmode OFF\n");
+ thermal->polling_delay = 0;
+ thermal_zone_device_update(thermal);
+ acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
+
+ /* let the thermal layer disable kernelmode. This ensures that
+ * the thermal layer doesn't switch off the fan again */
+ disable_kernelmode = 1;
+ } else {
+ if (verbose)
+ printk(K_NOTICE "kernelmode ON\n");
+ thermal->polling_delay = interval*1000;
+ thermal_zone_device_update(thermal);
+ kernelmode = 1;
+ }
+ return 0;
+}
+
+/* get the type of the trip point */
+static int get_trip_type(struct thermal_zone_device *thermal,
+ int trip, enum thermal_trip_type *type)
+{
+ if (trip == 0)
+ *type = THERMAL_TRIP_ACTIVE;
+ return 0;
+}
+
+/* get the temperature at which the trip point gets active */
+static int get_trip_temp(struct thermal_zone_device *thermal,
+ int trip, unsigned long *temp)
+{
+ if (trip == 0)
+ *temp = fanon;
+ return 0;
+}
+
+static int get_crit_temp(struct thermal_zone_device *thermal,
+ unsigned long *temperature)
+{
+ *temperature = ACERHDF_TEMP_CRIT;
+ return 0;
+}
+
+/* bind callback functions to thermalzone */
+struct thermal_zone_device_ops acerhdf_device_ops = {
+ .bind = bind,
+ .unbind = unbind,
+ .get_temp = get_ec_temp,
+ .get_mode = get_mode,
+ .set_mode = set_mode,
+ .get_trip_type = get_trip_type,
+ .get_trip_temp = get_trip_temp,
+ .get_crit_temp = get_crit_temp,
+};
+
+
+/* cooling device callback functions */
+/**********************************************************************/
+/* get maximal fan cooling state */
+static int get_max_state(struct thermal_cooling_device *cdev,
+ unsigned long *state)
+{
+ *state = 1;
+ return 0;
+}
+
+/* get current fan state */
+static int get_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long *state)
+{
+ unsigned long st = acerhdf_get_fanstate();
+
+ if (st == ACERHDF_ERROR)
+ return -EINVAL;
+
+ *state = st;
+ return 0;
+}
+
+/* change current fan state - is overwritten when running in kernel mode */
+static int set_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long state)
+{
+ int old_state;
+
+ /* let the thermal layer disable kernelmode. This ensures that
+ * the thermal layer doesn't switch off the fan again */
+ if (disable_kernelmode) {
+ acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
+ disable_kernelmode = 0;
+ kernelmode = 0;
+ return 0;
+ }
+
+ if (!kernelmode) {
+ acerhdf_change_fanstate(state);
+ return 0;
+ }
+
+ old_state = acerhdf_get_fanstate();
+
+ /* if reading the fan's state returns unexpected value, there's a
+ * problem with the ec register. -> let the BIOS take control of
+ * the fan to prevent hardware damage */
+ if (old_state != fanstate) {
+ printk(K_ERR "failed reading fan state, "
+ "disabling kernelmode.\n");
+
+ if (verbose)
+ printk(K_ERR "read state: %d expected state: %d\n",
+ old_state, fanstate);
+
+ acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
+ disable_kernelmode = 1;
+ }
+
+ if (state && !old_state)
+ acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
+
+ if (!state && old_state && (acerhdf_get_temp() < fanoff))
+ acerhdf_change_fanstate(ACERHDF_FAN_OFF);
+
+ return 0;
+}
+
+/* bind fan callbacks to fan device */
+struct thermal_cooling_device_ops acerhdf_cooling_ops = {
+ .get_max_state = get_max_state,
+ .get_cur_state = get_cur_state,
+ .set_cur_state = set_cur_state,
+};
+
+/* kernel module init / exit functions */
+/**********************************************************************/
+/* initialize the module */
+static int __init acerhdf_init(void)
+{
+ char const *vendor;
+ char const *version;
+ char const *release;
+ char const *product;
+ int i;
+ int ret_val = 0;
+
+
+ /* get bios data */
+ vendor = dmi_get_system_info(DMI_SYS_VENDOR);
+ version = dmi_get_system_info(DMI_BIOS_VERSION);
+ release = dmi_get_system_info(DMI_BIOS_DATE);
+ product = dmi_get_system_info(DMI_PRODUCT_NAME);
+
+
+ /* print out bios data */
+ printk(K_NOTICE "version: %s compilation date: %s %s\n",
+ VERSION, __DATE__, __TIME__);
+ printk(K_NOTICE "BIOS vendor:%s versoin:%s\n", vendor, version);
+ if (verbose)
+ printk(K_NOTICE "BIOS release:%s product:%s\n",
+ release, product);
+
+ if (!force_bios[0]) {
+ /* check if product is a AO - Aspire One */
+ if (strncmp(product, "AO", 2)) {
+ printk(K_ERR "no Aspire One hardware found\n");
+ ret_val = -ENODEV;
+ goto EXIT;
+ }
+ } else {
+ printk(K_NOTICE "acerhdf: bios version: %s forced\n", version);
+ version = force_bios;
+ kernelmode = 0;
+ }
+
+ /* if started in user mode, prevent the kernel from switching
+ * off the fan */
+ if (!kernelmode) {
+ disable_kernelmode = 1;
+ printk(K_NOTICE "kernelmode OFF, to enable:\n");
+ printk(K_NOTICE "echo -n \"enabled\" > "
+ "/sys/class/thermal/thermal_zone0/mode\n");
+ printk(K_NOTICE "http://piie.net/files/acerhdf_README.txt\n";);
+ }
+
+
+ /* search bios and bios vendor in bios settings table */
+ for (i = 0; bios_settings[i].version[0]; ++i) {
+ if (!strcmp(bios_settings[i].vendor, vendor) &&
+ !strcmp(bios_settings[i].version, version)) {
+ bios_version = i;
+ break;
+ }
+ }
+ if (bios_version == -1) {
+ printk(K_ERR "cannot find bios version\n");
+ ret_val = -ENODEV;
+ goto EXIT;
+ }
+
+ acerhdf_cool_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
+ &acerhdf_cooling_ops);
+ if (IS_ERR(acerhdf_cool_dev)) {
+ ret_val = -ENODEV;
+ goto EXIT;
+ }
+
+ acerhdf_thz_dev = thermal_zone_device_register("acerhdf", 1,
+ NULL, &acerhdf_device_ops, 0, 0, 0,
+ (kernelmode) ? interval*1000 : 0);
+ if (IS_ERR(acerhdf_thz_dev)) {
+ ret_val = -ENODEV;
+ goto EXIT_COOL_UNREG;
+ }
+
+ goto EXIT;
+
+EXIT_COOL_UNREG:
+ if (acerhdf_cool_dev) {
+ thermal_cooling_device_unregister(acerhdf_cool_dev);
+ acerhdf_cool_dev = NULL;
+ }
+
+EXIT:
+ return ret_val;
+}
+
+/* exit the module */
+static void __exit acerhdf_exit(void)
+{
+ acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
+
+ if (acerhdf_cool_dev) {
+ thermal_cooling_device_unregister(acerhdf_cool_dev);
+ acerhdf_cool_dev = NULL;
+ }
+
+ if (acerhdf_thz_dev) {
+ thermal_zone_device_unregister(acerhdf_thz_dev);
+ acerhdf_thz_dev = NULL;
+ }
+}
+
+/* what are the module init/exit functions */
+module_init(acerhdf_init);
+module_exit(acerhdf_exit);
--
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