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Message-ID: <cone.1243865900.580144.4368.1000@deskpiie>
Date: Mon, 01 Jun 2009 16:18:20 +0200
From: Peter Feuerer <peter@...e.net>
To: Borislav Petkov <petkovbb@...glemail.com>
Cc: LKML <linux-kernel@...r.kernel.org>, lenb@...nel.org,
Matthew Garrett <mjg59@...f.ucam.org>,
Maxim Levitsky <maximlevitsky@...il.com>
Subject: Re: [PATCH] Acer Aspire One Fan Control
Hi everybody,
new acerhdf patch, as usual patched against and tested with recent linus git tree.
I lowered the default trip points to fanon=63 and fanoff=58 as it's more
secure and still high enaugh to keep the netbook quiet while idling.
kind regards,
--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@...e.net>
Reviewed-by: Borislav Petkov <petkovbb@...il.com>
Tested-by: Borislav Petkov <petkovbb@...il.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 41c6605..bd7617e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -222,6 +222,13 @@ L: linux-acenic@...site.dk
S: Maintained
F: drivers/net/acenic*
+ACER ASPIRE ONE TEMPERATURE AND FAN DRIVER
+P: Peter Feuerer
+M: peter@...e.net
+W: http://piie.net/?section=acerhdf
+S: Maintained
+F: drivers/platform/x86/acerhdf.c
+
ACER WMI LAPTOP EXTRAS
P: Carlos Corbacho
M: carlos@...angeworlds.co.uk
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 284ebac..fe14dfd 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -34,6 +34,23 @@ 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.
+
+ After loading this driver the BIOS is still in control of the fan.
+ To let the kernel handle the fan, do:
+ echo -n enabled > /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..dcfb8b2
--- /dev/null
+++ b/drivers/platform/x86/acerhdf.c
@@ -0,0 +1,533 @@
+/*
+ * acerhdf - A driver 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
+ * - Matthew Garrett
+ * - Borislav Petkov
+ *
+ * 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
+ */
+
+#define pr_fmt(fmt) "acerhdf: " fmt
+
+#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 kernel mode,
+ * define the following:
+ */
+#undef START_IN_KERNEL_MODE
+
+#define VERSION "0.5.3"
+
+/*
+ * According to the Atom N270 datasheet,
+ * (http://download.intel.com/design/processor/datashts/320032.pdf) the
+ * CPU's optimal operating limits denoted in junction temperature as
+ * measured by the on-die thermal monitor are within 0 <= Tj <= 90. So,
+ * assume 89°C is critical temperature.
+ */
+#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
+
+/*
+ * Maximal interval between to temperature checks is 20 seconds, as the die
+ * can get hot really fast under heavy load
+ */
+#define ACERHDF_MAX_INTERVAL 20
+
+#define ACERHDF_ERROR -0xffff
+
+
+
+#ifdef START_IN_KERNEL_MODE
+static int kernelmode = 1;
+#else
+static int kernelmode;
+#endif
+
+static unsigned int interval = 10;
+static unsigned int fanon = 63;
+static unsigned int fanoff = 58;
+static unsigned int verbose;
+static unsigned int fanstate = ACERHDF_FAN_AUTO;
+static int disable_kernelmode;
+static int bios_version = -1;
+static char force_bios[16];
+static unsigned int prev_interval;
+struct thermal_zone_device *acerhdf_thz_dev;
+struct thermal_cooling_device *acerhdf_cool_dev;
+
+module_param(kernelmode, uint, 0);
+MODULE_PARM_DESC(kernelmode, "Kernel mode on / off");
+module_param(interval, uint, 0600);
+MODULE_PARM_DESC(interval, "Polling interval of temperature check");
+module_param(fanon, uint, 0600);
+MODULE_PARM_DESC(fanon, "Turn the fan on above this temperature");
+module_param(fanoff, uint, 0600);
+MODULE_PARM_DESC(fanoff, "Turn the fan off below this temperature");
+module_param(verbose, uint, 0600);
+MODULE_PARM_DESC(verbose, "Enable verbose dmesg output");
+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;
+};
+
+/* Register addresses and values for different BIOS versions */
+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},
+ {"Acer", "v0.3310", 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 */
+static int acerhdf_get_temp(void)
+{
+ u8 temp;
+
+ /* read temperature */
+ if (!ec_read(bios_settings[bios_version].tempreg, &temp)) {
+ if (verbose)
+ pr_notice("temp %d\n", temp);
+ return temp;
+ }
+ return ACERHDF_ERROR;
+}
+
+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;
+}
+
+static void acerhdf_change_fanstate(int state)
+{
+ unsigned char cmd;
+
+ if (verbose)
+ pr_notice("fan %s\n", (state == ACERHDF_FAN_AUTO) ?
+ "ON" : "OFF");
+
+ if (state == ACERHDF_FAN_AUTO) {
+ cmd = bios_settings[bios_version].cmd_auto;
+ fanstate = ACERHDF_FAN_AUTO;
+ } else {
+ cmd = bios_settings[bios_version].cmd_off;
+ fanstate = ACERHDF_FAN_OFF;
+ }
+
+ ec_write(bios_settings[bios_version].fanreg, cmd);
+
+}
+
+/* helpers */
+static void acerhdf_check_param(struct thermal_zone_device *thermal)
+{
+ if (fanon > ACERHDF_MAX_FANON) {
+ pr_err("fanon temperature too high, set to %d\n",
+ ACERHDF_MAX_FANON);
+ fanon = ACERHDF_MAX_FANON;
+ }
+ if (kernelmode && prev_interval != interval) {
+ if (interval > ACERHDF_MAX_INTERVAL) {
+ pr_err("interval too high, set to %d\n",
+ ACERHDF_MAX_INTERVAL);
+ interval = ACERHDF_MAX_INTERVAL;
+ }
+ if (verbose)
+ pr_notice("interval changed to: %d\n",
+ interval);
+ thermal->polling_delay = interval*1000;
+ prev_interval = interval;
+ }
+}
+
+/* thermal zone callback functions */
+static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal,
+ unsigned long *t)
+{
+ int temp;
+
+ acerhdf_check_param(thermal);
+
+ temp = acerhdf_get_temp();
+ if (temp == ACERHDF_ERROR)
+ return -EINVAL;
+
+ *t = temp;
+ return 0;
+}
+
+static int acerhdf_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)
+ return 0;
+
+ if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) {
+ pr_err("error binding cooling dev\n");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int acerhdf_unbind(struct thermal_zone_device *thermal,
+ struct thermal_cooling_device *cdev)
+{
+ if (cdev != acerhdf_cool_dev)
+ return 0;
+
+ if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) {
+ pr_err("acerhdf: error unbinding cooling dev\n");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/* current operation mode - enabled / disabled */
+static int acerhdf_get_mode(struct thermal_zone_device *thermal,
+ enum thermal_device_mode *mode)
+{
+ if (verbose)
+ pr_notice("kernel mode %d\n", kernelmode);
+
+ *mode = (kernelmode) ? THERMAL_DEVICE_ENABLED :
+ THERMAL_DEVICE_DISABLED;
+
+ return 0;
+}
+
+/*
+ * set operation mode;
+ * enabled: the thermal layer of the kernel takes care about
+ * the temperature and the fan.
+ * disabled: the BIOS takes control of the fan.
+ */
+static int acerhdf_set_mode(struct thermal_zone_device *thermal,
+ enum thermal_device_mode mode)
+{
+ if (mode == THERMAL_DEVICE_DISABLED) {
+ pr_notice("kernel mode OFF\n");
+ thermal->polling_delay = 0;
+ thermal_zone_device_update(thermal);
+ acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
+
+ /*
+ * let the thermal layer disable kernel mode. This ensures that
+ * the thermal layer doesn't switch off the fan again
+ */
+ disable_kernelmode = 1;
+ } else {
+ kernelmode = 1;
+ pr_notice("kernel mode ON\n");
+ thermal->polling_delay = interval*1000;
+ thermal_zone_device_update(thermal);
+ }
+ return 0;
+}
+
+static int acerhdf_get_trip_type(struct thermal_zone_device *thermal,
+ int trip, enum thermal_trip_type *type)
+{
+ if (trip == 0)
+ *type = THERMAL_TRIP_ACTIVE;
+ return 0;
+}
+
+static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal,
+ int trip, unsigned long *temp)
+{
+ if (trip == 0)
+ *temp = fanon;
+ return 0;
+}
+
+static int acerhdf_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 = acerhdf_bind,
+ .unbind = acerhdf_unbind,
+ .get_temp = acerhdf_get_ec_temp,
+ .get_mode = acerhdf_get_mode,
+ .set_mode = acerhdf_set_mode,
+ .get_trip_type = acerhdf_get_trip_type,
+ .get_trip_temp = acerhdf_get_trip_temp,
+ .get_crit_temp = acerhdf_get_crit_temp,
+};
+
+
+/*
+ * cooling device callback functions
+ * get maximal fan cooling state
+ */
+static int acerhdf_get_max_state(struct thermal_cooling_device *cdev,
+ unsigned long *state)
+{
+ *state = 1;
+ return 0;
+}
+
+static int acerhdf_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 == ACERHDF_FAN_AUTO) ? 1 : 0;
+ return 0;
+}
+
+/* change current fan state - is overwritten when running in kernel mode */
+static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long state)
+{
+ int cur_state;
+
+ /*
+ * let the thermal layer disable kernel mode. 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) {
+ pr_err("changing fan state is not allowed\n");
+ return -EINVAL;
+ }
+
+ cur_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 (cur_state != fanstate) {
+ pr_err("failed reading fan state, "
+ "disabling kernelmode.\n");
+
+ if (verbose)
+ pr_err("read state: %d expected state: %d\n",
+ cur_state, fanstate);
+
+ acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
+ disable_kernelmode = 1;
+ }
+
+ if (state == 0) {
+ /* turn fan off only if below fanoff temperature */
+ if ((cur_state == ACERHDF_FAN_AUTO) &&
+ (acerhdf_get_temp() < fanoff))
+ acerhdf_change_fanstate(ACERHDF_FAN_OFF);
+ } else {
+ if (cur_state == ACERHDF_FAN_OFF)
+ acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
+ }
+
+ return 0;
+}
+
+/* bind fan callbacks to fan device */
+struct thermal_cooling_device_ops acerhdf_cooling_ops = {
+ .get_max_state = acerhdf_get_max_state,
+ .get_cur_state = acerhdf_get_cur_state,
+ .set_cur_state = acerhdf_set_cur_state,
+};
+
+/* check hardware */
+static int acerhdf_check_hardware(void)
+{
+ int i;
+ char const *vendor;
+ char const *version;
+ char const *release;
+ char const *product;
+
+ /* 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);
+
+
+ if (verbose)
+ pr_notice("version %s\n", VERSION);
+ pr_notice("found BIOS vendor: \"%s\" version: \"%s\"\n",
+ vendor, version);
+ if (verbose)
+ pr_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)) {
+ pr_err("no Aspire One hardware found\n");
+ return ACERHDF_ERROR;
+ }
+ } else {
+ pr_notice("acerhdf: BIOS version: %s forced\n", version);
+ version = force_bios;
+ kernelmode = 0;
+ }
+
+ /*
+ * if started with kernel mode off, prevent the kernel from switching
+ * off the fan
+ */
+ if (!kernelmode) {
+ disable_kernelmode = 1;
+ pr_notice("Fan control off, to enable:\n");
+ pr_notice("echo -n \"enabled\" > "
+ "/sys/class/thermal/thermal_zone0/mode\n");
+ pr_notice("http://piie.net/files/acerhdf_README.txt\n");
+ }
+
+
+ /* search BIOS version 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) {
+ pr_err("cannot find BIOS version\n");
+ return ACERHDF_ERROR;
+ }
+ return 0;
+}
+
+static int acerhdf_register_thermal(void)
+{
+ acerhdf_cool_dev = thermal_cooling_device_register("acerhdf-fan", NULL,
+ &acerhdf_cooling_ops);
+ if (IS_ERR(acerhdf_cool_dev))
+ return ACERHDF_ERROR;
+
+ 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))
+ return ACERHDF_ERROR;
+
+ return 0;
+}
+
+static void acerhdf_unregister_thermal(void)
+{
+ 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;
+ }
+}
+
+/* kernel module init / exit functions */
+static int __init acerhdf_init(void)
+{
+ if (acerhdf_check_hardware() == ACERHDF_ERROR)
+ goto err;
+
+ if (acerhdf_register_thermal() == ACERHDF_ERROR)
+ goto err_unreg;
+
+ return 0;
+
+err_unreg:
+ acerhdf_unregister_thermal();
+
+err:
+ return -ENODEV;
+}
+
+static void __exit acerhdf_exit(void)
+{
+ acerhdf_change_fanstate(ACERHDF_FAN_AUTO);
+
+ acerhdf_unregister_thermal();
+}
+
+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*:*:");
+
+module_init(acerhdf_init);
+module_exit(acerhdf_exit);
--
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