diff options
Diffstat (limited to 'drivers/platform/x86/acerhdf.c')
| -rw-r--r-- | drivers/platform/x86/acerhdf.c | 602 |
1 files changed, 602 insertions, 0 deletions
diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c new file mode 100644 index 0000000..bdfee17 --- /dev/null +++ b/drivers/platform/x86/acerhdf.c @@ -0,0 +1,602 @@ +/* + * 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 <petkovbb@gmail.com> + * + * 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/fs.h> +#include <linux/dmi.h> +#include <acpi/acpi_drivers.h> +#include <linux/sched.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 "0.5.13" + +/* + * 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_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 80 + +/* + * 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 = 63; +static unsigned int fanoff = 58; +static unsigned int verbose; +static unsigned int fanstate = ACERHDF_FAN_AUTO; +static char force_bios[16]; +static unsigned int prev_interval; +struct thermal_zone_device *thz_dev; +struct thermal_cooling_device *cl_dev; +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"); + +/* BIOS settings */ +struct bios_settings_t { + const char *vendor; + const char *version; + unsigned char fanreg; + unsigned char tempreg; + unsigned char fancmd[2]; /* fan off and auto commands */ +}; + +/* Register addresses and values for different BIOS versions */ +static const struct bios_settings_t bios_tbl[] = { + {"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} } +}; + +static const struct bios_settings_t *bios_cfg __read_mostly; + + +static int acerhdf_get_temp(int *temp) +{ + u8 read_temp; + + if (ec_read(bios_cfg->tempreg, &read_temp)) + return -EINVAL; + + *temp = read_temp; + + return 0; +} + +static int acerhdf_get_fanstate(int *state) +{ + u8 fan; + bool tmp; + + if (ec_read(bios_cfg->fanreg, &fan)) + return -EINVAL; + + tmp = (fan == bios_cfg->fancmd[ACERHDF_FAN_OFF]); + *state = tmp ? ACERHDF_FAN_OFF : ACERHDF_FAN_AUTO; + + return 0; +} + +static void acerhdf_change_fanstate(int state) +{ + unsigned char cmd; + + if (verbose) + pr_notice("fan %s\n", (state == ACERHDF_FAN_OFF) ? + "OFF" : "ON"); + + if ((state != ACERHDF_FAN_OFF) && (state != ACERHDF_FAN_AUTO)) { + pr_err("invalid fan state %d requested, setting to auto!\n", + state); + state = ACERHDF_FAN_AUTO; + } + + cmd = bios_cfg->fancmd[state]; + fanstate = state; + + ec_write(bios_cfg->fanreg, cmd); +} + +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; + } +} + +/* + * This is the thermal zone callback which does the delayed polling of the fan + * state. We do check /sysfs-originating settings here in acerhdf_check_param() + * as late as the polling interval is since we can't do that in the respective + * accessors of the module parameters. + */ +static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, + unsigned long *t) +{ + int temp, err = 0; + + acerhdf_check_param(thermal); + + err = acerhdf_get_temp(&temp); + if (err) + return err; + + if (verbose) + pr_notice("temp %d\n", temp); + + *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 != cl_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 != cl_dev) + return 0; + + if (thermal_zone_unbind_cooling_device(thermal, 0, cdev)) { + pr_err("error unbinding cooling dev\n"); + return -EINVAL; + } + return 0; +} + +static inline void acerhdf_revert_to_bios_mode(void) +{ + acerhdf_change_fanstate(ACERHDF_FAN_AUTO); + kernelmode = 0; + if (thz_dev) + thz_dev->polling_delay = 0; + pr_notice("kernel mode fan control OFF\n"); +} +static inline void acerhdf_enable_kernelmode(void) +{ + kernelmode = 1; + + thz_dev->polling_delay = interval*1000; + thermal_zone_device_update(thz_dev); + pr_notice("kernel mode fan control ON\n"); +} + +static int acerhdf_get_mode(struct thermal_zone_device *thermal, + enum thermal_device_mode *mode) +{ + if (verbose) + pr_notice("kernel mode fan control %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 && kernelmode) + acerhdf_revert_to_bios_mode(); + else if (mode == THERMAL_DEVICE_ENABLED && !kernelmode) + acerhdf_enable_kernelmode(); + + 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_dev_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) +{ + int err = 0, tmp; + + err = acerhdf_get_fanstate(&tmp); + if (err) + return err; + + *state = (tmp == 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_temp, cur_state, err = 0; + + if (!kernelmode) + return 0; + + err = acerhdf_get_temp(&cur_temp); + if (err) { + pr_err("error reading temperature, hand off control to BIOS\n"); + goto err_out; + } + + err = acerhdf_get_fanstate(&cur_state); + if (err) { + pr_err("error reading fan state, hand off control to BIOS\n"); + goto err_out; + } + + if (state == 0) { + /* turn fan off only if below fanoff temperature */ + if ((cur_state == ACERHDF_FAN_AUTO) && + (cur_temp < fanoff)) + acerhdf_change_fanstate(ACERHDF_FAN_OFF); + } else { + if (cur_state == ACERHDF_FAN_OFF) + acerhdf_change_fanstate(ACERHDF_FAN_AUTO); + } + return 0; + +err_out: + acerhdf_revert_to_bios_mode(); + return -EINVAL; +} + +/* 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, +}; + +/* suspend / resume functionality */ +static int acerhdf_suspend(struct platform_device *dev, pm_message_t state) +{ + if (kernelmode) + acerhdf_change_fanstate(ACERHDF_FAN_AUTO); + + if (verbose) + pr_notice("going suspend\n"); + + return 0; +} + +static int acerhdf_resume(struct platform_device *device) +{ + if (verbose) + pr_notice("resuming\n"); + + return 0; +} + +static int __devinit acerhdf_probe(struct platform_device *device) +{ + return 0; +} + +static int acerhdf_remove(struct platform_device *device) +{ + return 0; +} + +struct platform_driver acerhdf_drv = { + .driver = { + .name = "acerhdf", + .owner = THIS_MODULE, + }, + .probe = acerhdf_probe, + .remove = acerhdf_remove, + .suspend = acerhdf_suspend, + .resume = acerhdf_resume, +}; + + +/* check hardware */ +static int acerhdf_check_hardware(void) +{ + char const *vendor, *version, *product; + int i; + + /* get BIOS data */ + vendor = dmi_get_system_info(DMI_SYS_VENDOR); + version = dmi_get_system_info(DMI_BIOS_VERSION); + product = dmi_get_system_info(DMI_PRODUCT_NAME); + + pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER); + + if (!force_bios[0]) { + if (strncmp(product, "AO", 2)) { + pr_err("no Aspire One hardware found\n"); + return -EINVAL; + } + } else { + pr_info("forcing BIOS version: %s\n", version); + version = force_bios; + kernelmode = 0; + } + + if (verbose) + pr_info("BIOS info: %s %s, product: %s\n", + vendor, version, product); + + /* search BIOS version and vendor in BIOS settings table */ + for (i = 0; bios_tbl[i].version[0]; i++) { + if (!strcmp(bios_tbl[i].vendor, vendor) && + !strcmp(bios_tbl[i].version, version)) { + bios_cfg = &bios_tbl[i]; + break; + } + } + + if (!bios_cfg) { + pr_err("unknown (unsupported) BIOS version %s/%s, " + "please report, aborting!\n", vendor, version); + return -EINVAL; + } + + /* + * if started with kernel mode off, prevent the kernel from switching + * off the fan + */ + if (!kernelmode) { + pr_notice("Fan control off, to enable do:\n"); + pr_notice("echo -n \"enabled\" > " + "/sys/class/thermal/thermal_zone0/mode\n"); + } + + return 0; +} + +static int acerhdf_register_platform(void) +{ + int err = 0; + + err = platform_driver_register(&acerhdf_drv); + if (err) + return err; + + acerhdf_dev = platform_device_alloc("acerhdf", -1); + platform_device_add(acerhdf_dev); + + return 0; +} + +static void acerhdf_unregister_platform(void) +{ + if (!acerhdf_dev) + return; + + platform_device_del(acerhdf_dev); + platform_driver_unregister(&acerhdf_drv); +} + +static int acerhdf_register_thermal(void) +{ + cl_dev = thermal_cooling_device_register("acerhdf-fan", NULL, + &acerhdf_cooling_ops); + + if (IS_ERR(cl_dev)) + return -EINVAL; + + thz_dev = thermal_zone_device_register("acerhdf", 1, NULL, + &acerhdf_dev_ops, 0, 0, 0, + (kernelmode) ? interval*1000 : 0); + if (IS_ERR(thz_dev)) + return -EINVAL; + + return 0; +} + +static void acerhdf_unregister_thermal(void) +{ + if (cl_dev) { + thermal_cooling_device_unregister(cl_dev); + cl_dev = NULL; + } + + if (thz_dev) { + thermal_zone_device_unregister(thz_dev); + thz_dev = NULL; + } +} + +static int __init acerhdf_init(void) +{ + int err = 0; + + err = acerhdf_check_hardware(); + if (err) + goto out_err; + + err = acerhdf_register_platform(); + if (err) + goto err_unreg; + + err = acerhdf_register_thermal(); + if (err) + goto err_unreg; + + return 0; + +err_unreg: + acerhdf_unregister_thermal(); + acerhdf_unregister_platform(); + +out_err: + return -ENODEV; +} + +static void __exit acerhdf_exit(void) +{ + acerhdf_change_fanstate(ACERHDF_FAN_AUTO); + acerhdf_unregister_thermal(); + acerhdf_unregister_platform(); +} + +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); |
