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authorCorentin Chary <corentincj@iksaif.net>2008-03-13 07:57:18 -0400
committerLen Brown <len.brown@intel.com>2008-04-29 10:08:07 -0400
commite1faa9da284d14487ed4280b4e87cfde8e1539af (patch)
tree7bcc0e3d7f44eed7c62103305c1b5bd1d665d731
parenta5fa429b4b19cccd3f91a98af891c7ba2706cc1d (diff)
eeepc-laptop: add hwmon fan control
Adds an hwmon interface to control the fan. Signed-off-by: Corentin Chary <corentincj@iksaif.net> Signed-off-by: Len Brown <len.brown@intel.com>
-rw-r--r--drivers/misc/Kconfig1
-rw-r--r--drivers/misc/eeepc-laptop.c147
2 files changed, 148 insertions, 0 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 01b7deba91e8..7a4869a9db86 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -356,6 +356,7 @@ config EEEPC_LAPTOP
356 depends on X86 356 depends on X86
357 depends on ACPI 357 depends on ACPI
358 depends on BACKLIGHT_CLASS_DEVICE 358 depends on BACKLIGHT_CLASS_DEVICE
359 depends on HWMON
359 depends on EXPERIMENTAL 360 depends on EXPERIMENTAL
360 ---help--- 361 ---help---
361 This driver supports the Fn-Fx keys on Eee PC laptops. 362 This driver supports the Fn-Fx keys on Eee PC laptops.
diff --git a/drivers/misc/eeepc-laptop.c b/drivers/misc/eeepc-laptop.c
index 2b59b7ed4b14..6d727609097f 100644
--- a/drivers/misc/eeepc-laptop.c
+++ b/drivers/misc/eeepc-laptop.c
@@ -23,6 +23,8 @@
23#include <linux/platform_device.h> 23#include <linux/platform_device.h>
24#include <linux/backlight.h> 24#include <linux/backlight.h>
25#include <linux/fb.h> 25#include <linux/fb.h>
26#include <linux/hwmon.h>
27#include <linux/hwmon-sysfs.h>
26#include <acpi/acpi_drivers.h> 28#include <acpi/acpi_drivers.h>
27#include <acpi/acpi_bus.h> 29#include <acpi/acpi_bus.h>
28#include <linux/uaccess.h> 30#include <linux/uaccess.h>
@@ -103,6 +105,15 @@ const char *cm_setv[] = {
103 "CRDS", NULL 105 "CRDS", NULL
104}; 106};
105 107
108#define EEEPC_EC "\\_SB.PCI0.SBRG.EC0."
109
110#define EEEPC_EC_FAN_PWM EEEPC_EC "SC02" /* Fan PWM duty cycle (%) */
111#define EEEPC_EC_SC02 0x63
112#define EEEPC_EC_FAN_HRPM EEEPC_EC "SC05" /* High byte, fan speed (RPM) */
113#define EEEPC_EC_FAN_LRPM EEEPC_EC "SC06" /* Low byte, fan speed (RPM) */
114#define EEEPC_EC_FAN_CTRL EEEPC_EC "SFB3" /* Byte containing SF25 */
115#define EEEPC_EC_SFB3 0xD3
116
106/* 117/*
107 * This is the main structure, we can use it to store useful information 118 * This is the main structure, we can use it to store useful information
108 * about the hotk device 119 * about the hotk device
@@ -154,6 +165,9 @@ static struct acpi_driver eeepc_hotk_driver = {
154/* The backlight device /sys/class/backlight */ 165/* The backlight device /sys/class/backlight */
155static struct backlight_device *eeepc_backlight_device; 166static struct backlight_device *eeepc_backlight_device;
156 167
168/* The hwmon device */
169static struct device *eeepc_hwmon_device;
170
157/* 171/*
158 * The backlight class declaration 172 * The backlight class declaration
159 */ 173 */
@@ -429,6 +443,100 @@ static int eeepc_hotk_remove(struct acpi_device *device, int type)
429} 443}
430 444
431/* 445/*
446 * Hwmon
447 */
448static int eeepc_get_fan_pwm(void)
449{
450 int value = 0;
451
452 read_acpi_int(NULL, EEEPC_EC_FAN_PWM, &value);
453 return (value);
454}
455
456static void eeepc_set_fan_pwm(int value)
457{
458 value = SENSORS_LIMIT(value, 0, 100);
459 ec_write(EEEPC_EC_SC02, value);
460}
461
462static int eeepc_get_fan_rpm(void)
463{
464 int high = 0;
465 int low = 0;
466
467 read_acpi_int(NULL, EEEPC_EC_FAN_HRPM, &high);
468 read_acpi_int(NULL, EEEPC_EC_FAN_LRPM, &low);
469 return (high << 8 | low);
470}
471
472static int eeepc_get_fan_ctrl(void)
473{
474 int value = 0;
475
476 read_acpi_int(NULL, EEEPC_EC_FAN_CTRL, &value);
477 return ((value & 0x02 ? 1 : 0));
478}
479
480static void eeepc_set_fan_ctrl(int manual)
481{
482 int value = 0;
483
484 read_acpi_int(NULL, EEEPC_EC_FAN_CTRL, &value);
485 if (manual)
486 value |= 0x02;
487 else
488 value &= ~0x02;
489 ec_write(EEEPC_EC_SFB3, value);
490}
491
492static ssize_t store_sys_hwmon(void (*set)(int), const char *buf, size_t count)
493{
494 int rv, value;
495
496 rv = parse_arg(buf, count, &value);
497 if (rv > 0)
498 set(value);
499 return rv;
500}
501
502static ssize_t show_sys_hwmon(int (*get)(void), char *buf)
503{
504 return sprintf(buf, "%d\n", get());
505}
506
507#define EEEPC_CREATE_SENSOR_ATTR(_name, _mode, _set, _get) \
508 static ssize_t show_##_name(struct device *dev, \
509 struct device_attribute *attr, \
510 char *buf) \
511 { \
512 return show_sys_hwmon(_set, buf); \
513 } \
514 static ssize_t store_##_name(struct device *dev, \
515 struct device_attribute *attr, \
516 const char *buf, size_t count) \
517 { \
518 return store_sys_hwmon(_get, buf, count); \
519 } \
520 static SENSOR_DEVICE_ATTR(_name, _mode, show_##_name, store_##_name, 0);
521
522EEEPC_CREATE_SENSOR_ATTR(fan1_input, S_IRUGO, eeepc_get_fan_rpm, NULL);
523EEEPC_CREATE_SENSOR_ATTR(fan1_pwm, S_IRUGO | S_IWUSR,
524 eeepc_get_fan_pwm, eeepc_set_fan_pwm);
525EEEPC_CREATE_SENSOR_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
526 eeepc_get_fan_ctrl, eeepc_set_fan_ctrl);
527
528static struct attribute *hwmon_attributes[] = {
529 &sensor_dev_attr_fan1_pwm.dev_attr.attr,
530 &sensor_dev_attr_fan1_input.dev_attr.attr,
531 &sensor_dev_attr_pwm1_enable.dev_attr.attr,
532 NULL
533};
534
535static struct attribute_group hwmon_attribute_group = {
536 .attrs = hwmon_attributes
537};
538
539/*
432 * exit/init 540 * exit/init
433 */ 541 */
434static void eeepc_backlight_exit(void) 542static void eeepc_backlight_exit(void)
@@ -438,9 +546,23 @@ static void eeepc_backlight_exit(void)
438 eeepc_backlight_device = NULL; 546 eeepc_backlight_device = NULL;
439} 547}
440 548
549static void eeepc_hwmon_exit(void)
550{
551 struct device *hwmon;
552
553 hwmon = eeepc_hwmon_device;
554 if (!hwmon)
555 return ;
556 hwmon_device_unregister(hwmon);
557 sysfs_remove_group(&hwmon->kobj,
558 &hwmon_attribute_group);
559 eeepc_hwmon_device = NULL;
560}
561
441static void __exit eeepc_laptop_exit(void) 562static void __exit eeepc_laptop_exit(void)
442{ 563{
443 eeepc_backlight_exit(); 564 eeepc_backlight_exit();
565 eeepc_hwmon_exit();
444 acpi_bus_unregister_driver(&eeepc_hotk_driver); 566 acpi_bus_unregister_driver(&eeepc_hotk_driver);
445 sysfs_remove_group(&platform_device->dev.kobj, 567 sysfs_remove_group(&platform_device->dev.kobj,
446 &platform_attribute_group); 568 &platform_attribute_group);
@@ -468,6 +590,26 @@ static int eeepc_backlight_init(struct device *dev)
468 return 0; 590 return 0;
469} 591}
470 592
593static int eeepc_hwmon_init(struct device *dev)
594{
595 struct device *hwmon;
596 int result;
597
598 hwmon = hwmon_device_register(dev);
599 if (IS_ERR(hwmon)) {
600 printk(EEEPC_ERR
601 "Could not register eeepc hwmon device\n");
602 eeepc_hwmon_device = NULL;
603 return PTR_ERR(hwmon);
604 }
605 eeepc_hwmon_device = hwmon;
606 result = sysfs_create_group(&hwmon->kobj,
607 &hwmon_attribute_group);
608 if (result)
609 eeepc_hwmon_exit();
610 return result;
611}
612
471static int __init eeepc_laptop_init(void) 613static int __init eeepc_laptop_init(void)
472{ 614{
473 struct device *dev; 615 struct device *dev;
@@ -486,6 +628,9 @@ static int __init eeepc_laptop_init(void)
486 result = eeepc_backlight_init(dev); 628 result = eeepc_backlight_init(dev);
487 if (result) 629 if (result)
488 goto fail_backlight; 630 goto fail_backlight;
631 result = eeepc_hwmon_init(dev);
632 if (result)
633 goto fail_hwmon;
489 /* Register platform stuff */ 634 /* Register platform stuff */
490 result = platform_driver_register(&platform_driver); 635 result = platform_driver_register(&platform_driver);
491 if (result) 636 if (result)
@@ -510,6 +655,8 @@ fail_platform_device2:
510fail_platform_device1: 655fail_platform_device1:
511 platform_driver_unregister(&platform_driver); 656 platform_driver_unregister(&platform_driver);
512fail_platform_driver: 657fail_platform_driver:
658 eeepc_hwmon_exit();
659fail_hwmon:
513 eeepc_backlight_exit(); 660 eeepc_backlight_exit();
514fail_backlight: 661fail_backlight:
515 return result; 662 return result;