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/*
* 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
* 2009 Borislav Petkov bp (a) alien8.de
*
* 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
* o lkml - Matthew Garrett
* - Borislav Petkov
* - Andreas Mohr
*
* 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/dmi.h>
#include <linux/acpi.h>
#include <linux/thermal.h>
#include <linux/platform_device.h>
/*
* The driver is started with "kernel mode off" by default. That means, the BIOS
* is still in control of the fan. In this mode the driver allows to read the
* temperature of the cpu and a userspace tool may take over control of the fan.
* If the driver is switched to "kernel mode" (e.g. via module parameter) the
* driver is in full control of the fan. If you want the module to be started in
* kernel mode by default, define the following:
*/
#undef START_IN_KERNEL_MODE
#define DRV_VER "0.7.0"
/*
* 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 89000
#define ACERHDF_FAN_OFF 0
#define ACERHDF_FAN_AUTO 1
/*
* 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 80000
/*
* Maximum interval between two temperature checks is 15 seconds, as the die
* can get hot really fast under heavy load (plus we shouldn't forget about
* possible impact of _external_ aggressive sources such as heaters, sun etc.)
*/
#define ACERHDF_MAX_INTERVAL 15
#ifdef START_IN_KERNEL_MODE
static int kernelmode = 1;
#else
static int kernelmode;
#endif
static unsigned int interval = 10;
static unsigned int fanon = 60000;
static unsigned int fanoff = 53000;
static unsigned int verbose;
static unsigned int fanstate = ACERHDF_FAN_AUTO;
static char force_bios[16];
static char force_product[16];
static unsigned int prev_interval;
static struct thermal_zone_device *thz_dev;
static struct thermal_cooling_device *cl_dev;
static struct platform_device *acerhdf_dev;
module_param(kernelmode, uint, 0);
MODULE_PARM_DESC(kernelmode, "Kernel mode fan control 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");
module_param_string(force_product, force_product, 16, 0);
MODULE_PARM_DESC(force_product, "Force BIOS product and omit BIOS check");
/*
* cmd_off: to switch the fan completely off and check if the fan is off
* cmd_auto: to set the BIOS in control of the fan. The BIOS regulates then
* the fan speed depending on the temperature
*/
struct fancmd {
u8 cmd_off;
u8 cmd_auto;
};
struct manualcmd {
u8 mreg;
u8 moff;
};
/* default register and command to disable fan in manual mode */
static const struct manualcmd mcmd = {
.mreg = 0x94,
.moff = 0xff,
};
/* BIOS settings */
struct bios_settings {
const char *vendor;
const char *product;
const char *version;
u8 fanreg;
u8 tempreg;
struct fancmd cmd;
int mcmd_enable;
};
/* Register addresses and values for different BIOS versions */
static const struct bios_settings bios_tbl[] = {
/* AOA110 */
{"Acer", "AOA110", "v0.3109", 0x55, 0x58, {0x1f, 0x00}, 0},
{"Acer", "AOA110", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
{"Acer", "AOA110", "v0.3301", 0x55, 0x58, {0xaf, 0x00}, 0},
{"Acer", "AOA110", "v0.3304", 0x55, 0x58, {0xaf, 0x00}, 0},
{"Acer", "AOA110", "v0.3305", 0x55, 0x58, {0xaf, 0x00}, 0},
{"Acer", "AOA110", "v0.3307", 0x55, 0x58, {0xaf, 0x00}, 0},
{"Acer", "AOA110", "v0.3308", 0x55, 0x58, {0x21, 0x00}, 0},
{"Acer", "AOA110", "v0.3309", 0x55, 0x58, {0x21, 0x00}, 0},
{"Acer", "AOA110", "v0.3310", 0x55, 0x58, {0x21, 0x00}, 0},
/* AOA150 */
{"Acer", "AOA150", "v0.3114", 0x55, 0x58, {0x1f, 0x00}, 0},
{"Acer", "AOA150", "v0.3301", 0x55, 0x58, {0x20, 0x00}, 0},
{"Acer", "AOA150", "v0.3304", 0x55, 0x58, {0x20, 0x00}, 0},
{"Acer", "AOA150", "v0.3305", 0x55, 0x58, {0x20, 0x00}, 0},
{"Acer", "AOA150", "v0.3307", 0x55, 0x58, {0x20, 0x00}, 0},
{"Acer", "AOA150", "v0.3308", 0x55, 0x58, {0x20, 0x00}, 0},
{"Acer", "AOA150", "v0.3309", 0x55, 0x58, {0x20, 0x00}, 0},
{"Acer", "AOA150", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
/* LT1005u */
{"Acer", "LT-10Q", "v0.3310", 0x55, 0x58, {0x20, 0x00}, 0},
/* Acer 1410 */
{"Acer", "Aspire 1410", "v0.3108", 0x55, 0x58,
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