Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756517AbaLIDD5 (ORCPT ); Mon, 8 Dec 2014 22:03:57 -0500 Received: from mga02.intel.com ([134.134.136.20]:64303 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756266AbaLIDDz (ORCPT ); Mon, 8 Dec 2014 22:03:55 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.04,691,1406617200"; d="scan'208";a="495800902" Message-ID: <54866698.4060903@intel.com> Date: Tue, 09 Dec 2014 11:03:52 +0800 From: Aaron Lu MIME-Version: 1.0 To: Zhang Rui CC: Stephen Rothwell , linux-next@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] Thermal: introduce INT3406 thermal driver References: <20141209131744.084929df@canb.auug.org.au> <54865F05.2060103@intel.com> <1418092358.12435.1.camel@rzhang1-toshiba> In-Reply-To: <1418092358.12435.1.camel@rzhang1-toshiba> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org INT3406 ACPI device object resembles an ACPI video output device, but its _BCM is said to be deprecated and should not be used. So we will make use of the raw interface to do the actual cooling. Due to this, the backlight core has some modifications. Also, to re-use some of the ACPI video module's code, one function has been exported. Signed-off-by: Aaron Lu Signed-off-by: Zhang Rui --- drivers/acpi/video.c | 78 ++++---- drivers/thermal/Kconfig | 26 +-- drivers/thermal/int340x_thermal/Kconfig | 41 ++++ drivers/thermal/int340x_thermal/Makefile | 1 + drivers/thermal/int340x_thermal/int3406_thermal.c | 230 ++++++++++++++++++++++ drivers/video/backlight/backlight.c | 44 +++-- include/acpi/video.h | 20 ++ include/linux/backlight.h | 2 + 8 files changed, 367 insertions(+), 75 deletions(-) create mode 100644 drivers/thermal/int340x_thermal/Kconfig create mode 100644 drivers/thermal/int340x_thermal/int3406_thermal.c diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c index 9d75ead..12f5c5d 100644 --- a/drivers/acpi/video.c +++ b/drivers/acpi/video.c @@ -186,19 +186,6 @@ struct acpi_video_device_cap { u8 _DDC:1; /* Return the EDID for this device */ }; -struct acpi_video_brightness_flags { - u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */ - u8 _BCL_reversed:1; /* _BCL package is in a reversed order */ - u8 _BQC_use_index:1; /* _BQC returns an index value */ -}; - -struct acpi_video_device_brightness { - int curr; - int count; - int *levels; - struct acpi_video_brightness_flags flags; -}; - struct acpi_video_device { unsigned long device_id; struct acpi_video_device_flags flags; @@ -344,7 +331,7 @@ static const struct thermal_cooling_device_ops video_cooling_ops = { */ static int -acpi_video_device_lcd_query_levels(struct acpi_video_device *device, +acpi_video_device_lcd_query_levels(acpi_handle handle, union acpi_object **levels) { int status; @@ -354,7 +341,7 @@ acpi_video_device_lcd_query_levels(struct acpi_video_device *device, *levels = NULL; - status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer); + status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer); if (!ACPI_SUCCESS(status)) return status; obj = (union acpi_object *)buffer.pointer; @@ -727,29 +714,18 @@ static int acpi_video_bqc_quirk(struct acpi_video_device *device, return 0; } - -/* - * Arg: - * device : video output device (LCD, CRT, ..) - * - * Return Value: - * Maximum brightness level - * - * Allocate and initialize device->brightness. - */ - -static int -acpi_video_init_brightness(struct acpi_video_device *device) +int acpi_video_get_levels(struct acpi_device *device, + struct acpi_video_device_brightness **dev_br) { union acpi_object *obj = NULL; int i, max_level = 0, count = 0, level_ac_battery = 0; - unsigned long long level, level_old; union acpi_object *o; struct acpi_video_device_brightness *br = NULL; - int result = -EINVAL; + int result = 0; u32 value; - if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) { + if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device->handle, + &obj))) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available " "LCD brightness level\n")); goto out; @@ -822,6 +798,38 @@ acpi_video_init_brightness(struct acpi_video_device *device) "Found unordered _BCL package")); br->count = count; + *dev_br = br; + +out: + kfree(obj); + return result; +out_free: + kfree(br); + goto out; +} +EXPORT_SYMBOL(acpi_video_get_levels); + +/* + * Arg: + * device : video output device (LCD, CRT, ..) + * + * Return Value: + * Maximum brightness level + * + * Allocate and initialize device->brightness. + */ + +static int +acpi_video_init_brightness(struct acpi_video_device *device) +{ + int i, max_level = 0; + unsigned long long level, level_old; + struct acpi_video_device_brightness *br = NULL; + int result = -EINVAL; + + result = acpi_video_get_levels(device->dev, &br); + if (result) + return result; device->brightness = br; /* _BQC uses INDEX while _BCL uses VALUE in some laptops */ @@ -864,17 +872,13 @@ set_level: goto out_free_levels; ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "found %d brightness levels\n", count - 2)); - kfree(obj); - return result; + "found %d brightness levels\n", br->count - 2)); + return 0; out_free_levels: kfree(br->levels); -out_free: kfree(br); -out: device->brightness = NULL; - kfree(obj); return result; } diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index f554d25..ac391d8 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -229,29 +229,9 @@ config INTEL_SOC_DTS_THERMAL notification methods.The other trip is a critical trip point, which was set by the driver based on the TJ MAX temperature. -config INT340X_THERMAL - tristate "ACPI INT340X thermal drivers" - depends on X86 && ACPI - select THERMAL_GOV_USER_SPACE - select ACPI_THERMAL_REL - select ACPI_FAN - help - Newer laptops and tablets that use ACPI may have thermal sensors and - other devices with thermal control capabilities outside the core - CPU/SOC, for thermal safety reasons. - They are exposed for the OS to use via the INT3400 ACPI device object - as the master, and INT3401~INT340B ACPI device objects as the slaves. - Enable this to expose the temperature information and cooling ability - from these objects to userspace via the normal thermal framework. - This means that a wide range of applications and GUI widgets can show - the information to the user or use this information for making - decisions. For example, the Intel Thermal Daemon can use this - information to allow the user to select his laptop to run without - turning on the fans. - -config ACPI_THERMAL_REL - tristate - depends on ACPI +menu "ACPI INT340X thermal drivers" +source drivers/thermal/int340x_thermal/Kconfig +endmenu menu "Texas Instruments thermal drivers" source "drivers/thermal/ti-soc-thermal/Kconfig" diff --git a/drivers/thermal/int340x_thermal/Kconfig b/drivers/thermal/int340x_thermal/Kconfig new file mode 100644 index 0000000..b92892a --- /dev/null +++ b/drivers/thermal/int340x_thermal/Kconfig @@ -0,0 +1,41 @@ +# +# ACPI INT340x thermal drivers configuration +# + +config INT340X_THERMAL + tristate "ACPI INT340X thermal drivers" + depends on X86 && ACPI + select THERMAL_GOV_USER_SPACE + select ACPI_THERMAL_REL + select ACPI_FAN + help + Newer laptops and tablets that use ACPI may have thermal sensors and + other devices with thermal control capabilities outside the core + CPU/SOC, for thermal safety reasons. + They are exposed for the OS to use via the INT3400 ACPI device object + as the master, and INT3401~INT340B ACPI device objects as the slaves. + Enable this to expose the temperature information and cooling ability + from these objects to userspace via the normal thermal framework. + This means that a wide range of applications and GUI widgets can show + the information to the user or use this information for making + decisions. For example, the Intel Thermal Daemon can use this + information to allow the user to select his laptop to run without + turning on the fans. + +if INT340X_THERMAL + +config ACPI_THERMAL_REL + tristate + depends on ACPI + +config INT3406_THERMAL + tristate "ACPI INT3406 display thermal driver" + depends on ACPI_VIDEO + help + The display thermal device represents the LED/LCD display panel + that may or may not include touch support. The main function of + the display thermal device is to allow control of the display + brightness in order to address a thermal condition or to reduce + power consumed by display device. + +endif diff --git a/drivers/thermal/int340x_thermal/Makefile b/drivers/thermal/int340x_thermal/Makefile index ffe40bf..a9d0429 100644 --- a/drivers/thermal/int340x_thermal/Makefile +++ b/drivers/thermal/int340x_thermal/Makefile @@ -1,4 +1,5 @@ obj-$(CONFIG_INT340X_THERMAL) += int3400_thermal.o obj-$(CONFIG_INT340X_THERMAL) += int3402_thermal.o obj-$(CONFIG_INT340X_THERMAL) += int3403_thermal.o +obj-$(CONFIG_INT3406_THERMAL) += int3406_thermal.o obj-$(CONFIG_ACPI_THERMAL_REL) += acpi_thermal_rel.o diff --git a/drivers/thermal/int340x_thermal/int3406_thermal.c b/drivers/thermal/int340x_thermal/int3406_thermal.c new file mode 100644 index 0000000..162ddee --- /dev/null +++ b/drivers/thermal/int340x_thermal/int3406_thermal.c @@ -0,0 +1,230 @@ +/* + * INT3406 thermal driver for display participant device + * + * Copyright (C) 2014, Intel Corporation + * Authors: Aaron Lu + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include +#include +#include +#include +#include +#include + +#define INT3406_BRIGHTNESS_LIMITS_CHANGED 0x80 + +struct int3406_thermal_data { + int upper_limit; + int upper_limit_index; + int lower_limit; + int lower_limit_index; + acpi_handle handle; + struct acpi_video_device_brightness *br; + struct backlight_device *raw_bd; + struct thermal_cooling_device *cooling_dev; +}; + +static int int3406_thermal_to_raw(int level, struct int3406_thermal_data *d) +{ + int max_level = d->br->levels[d->br->count - 1]; + int raw_max = d->raw_bd->props.max_brightness; + + return level * raw_max / max_level; +} + +static int int3406_thermal_to_acpi(int level, struct int3406_thermal_data *d) +{ + int raw_max = d->raw_bd->props.max_brightness; + int max_level = d->br->levels[d->br->count - 1]; + + return level * max_level / raw_max; +} + +static int +int3406_thermal_get_max_state(struct thermal_cooling_device *cooling_dev, + unsigned long *state) +{ + struct int3406_thermal_data *d = cooling_dev->devdata; + int index = d->lower_limit_index ? d->lower_limit_index : 2; + + *state = d->br->count - 1 - index; + return 0; +} + +static int +int3406_thermal_set_cur_state(struct thermal_cooling_device *cooling_dev, + unsigned long state) +{ + struct int3406_thermal_data *d = cooling_dev->devdata; + int level, raw_level; + + if (state > d->br->count - 3) + return -EINVAL; + + state = d->br->count - 1 - state; + level = d->br->levels[state]; + + if ((d->upper_limit && level > d->upper_limit) || + (d->lower_limit && level < d->lower_limit)) + return -EINVAL; + + raw_level = int3406_thermal_to_raw(level, d); + return backlight_device_set_brightness(d->raw_bd, raw_level); +} + +static int +int3406_thermal_get_cur_state(struct thermal_cooling_device *cooling_dev, + unsigned long *state) +{ + struct int3406_thermal_data *d = cooling_dev->devdata; + int raw_level, level, i; + + raw_level = d->raw_bd->props.brightness; + level = int3406_thermal_to_acpi(raw_level, d); + + /* + * There is no 1:1 mapping between the firmware interface level with the + * raw interface level, we will have to find one that is close enough. + */ + for (i = 2; i < d->br->count - 1; i++) { + if (level >= d->br->levels[i] && level <= d->br->levels[i + 1]) + break; + } + + *state = i; + return 0; +} + +static const struct thermal_cooling_device_ops video_cooling_ops = { + .get_max_state = int3406_thermal_get_max_state, + .get_cur_state = int3406_thermal_get_cur_state, + .set_cur_state = int3406_thermal_set_cur_state, +}; + +static int int3406_thermal_get_index(int *array, int nr, int value) +{ + int i; + + for (i = 0; i < nr; i++) { + if (array[i] == value) + break; + } + return i == nr ? -ENOENT : i; +} + +static void int3406_thermal_get_limit(struct int3406_thermal_data *d) +{ + acpi_status status; + unsigned long long lower_limit, upper_limit; + int index; + + status = acpi_evaluate_integer(d->handle, "DDDL", NULL, &lower_limit); + if (ACPI_SUCCESS(status)) { + index = int3406_thermal_get_index(d->br->levels, d->br->count, + lower_limit); + if (index > 0) { + d->lower_limit = (int)lower_limit; + d->lower_limit_index = index; + } + } + + status = acpi_evaluate_integer(d->handle, "DDPC", NULL, &upper_limit); + if (ACPI_SUCCESS(status)) { + index = int3406_thermal_get_index(d->br->levels, d->br->count, + upper_limit); + if (index > 0) { + d->upper_limit = (int)upper_limit; + d->upper_limit_index = index; + } + } +} + +static void int3406_notify(acpi_handle handle, u32 event, void *data) +{ + if (event == INT3406_BRIGHTNESS_LIMITS_CHANGED) + int3406_thermal_get_limit(data); +} + +static int int3406_thermal_probe(struct platform_device *pdev) +{ + struct acpi_device *adev = ACPI_COMPANION(&pdev->dev); + struct int3406_thermal_data *d; + struct backlight_device *bd; + int ret; + + if (!ACPI_HANDLE(&pdev->dev)) + return -ENODEV; + + d = devm_kzalloc(&pdev->dev, sizeof(*d), GFP_KERNEL); + if (!d) + return -ENOMEM; + d->handle = ACPI_HANDLE(&pdev->dev); + + bd = backlight_device_get_by_type(BACKLIGHT_RAW); + if (!bd) + return -ENODEV; + d->raw_bd = bd; + + ret = acpi_video_get_levels(ACPI_COMPANION(&pdev->dev), &d->br); + if (ret) + return ret; + + int3406_thermal_get_limit(d); + + d->cooling_dev = thermal_cooling_device_register(acpi_device_bid(adev), + d, &video_cooling_ops); + if (IS_ERR(d->cooling_dev)) + goto err; + + ret = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, + int3406_notify, d); + if (ret) + goto err_cdev; + + platform_set_drvdata(pdev, d); + + return 0; + +err_cdev: + thermal_cooling_device_unregister(d->cooling_dev); +err: + kfree(d->br); + return -ENODEV; +} + +static int int3406_thermal_remove(struct platform_device *pdev) +{ + struct int3406_thermal_data *d = platform_get_drvdata(pdev); + + thermal_cooling_device_unregister(platform_get_drvdata(pdev)); + kfree(d->br); + return 0; +} + +static const struct acpi_device_id int3406_thermal_match[] = { + {"INT3406", 0}, + {} +}; + +MODULE_DEVICE_TABLE(acpi, int3406_thermal_match); + +static struct platform_driver int3406_thermal_driver = { + .probe = int3406_thermal_probe, + .remove = int3406_thermal_remove, + .driver = { + .name = "int3406 thermal", + .owner = THIS_MODULE, + .acpi_match_table = int3406_thermal_match, + }, +}; + +module_platform_driver(int3406_thermal_driver); + +MODULE_DESCRIPTION("INT3406 Thermal driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c index bddc8b1..bea7493 100644 --- a/drivers/video/backlight/backlight.c +++ b/drivers/video/backlight/backlight.c @@ -164,28 +164,19 @@ static ssize_t brightness_show(struct device *dev, return sprintf(buf, "%d\n", bd->props.brightness); } -static ssize_t brightness_store(struct device *dev, - struct device_attribute *attr, const char *buf, size_t count) +int backlight_device_set_brightness(struct backlight_device *bd, int brightness) { - int rc; - struct backlight_device *bd = to_backlight_device(dev); - unsigned long brightness; - - rc = kstrtoul(buf, 0, &brightness); - if (rc) - return rc; - - rc = -ENXIO; + int rc = -ENXIO; mutex_lock(&bd->ops_lock); if (bd->ops) { if (brightness > bd->props.max_brightness) rc = -EINVAL; else { - pr_debug("set brightness to %lu\n", brightness); + pr_debug("set brightness to %u\n", brightness); bd->props.brightness = brightness; backlight_update_status(bd); - rc = count; + rc = 0; } } mutex_unlock(&bd->ops_lock); @@ -194,6 +185,23 @@ static ssize_t brightness_store(struct device *dev, return rc; } +EXPORT_SYMBOL(backlight_device_set_brightness); + +static ssize_t brightness_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + int rc; + struct backlight_device *bd = to_backlight_device(dev); + unsigned long brightness; + + rc = kstrtoul(buf, 0, &brightness); + if (rc) + return rc; + + rc = backlight_device_set_brightness(bd, brightness); + + return rc ? rc : count; +} static DEVICE_ATTR_RW(brightness); static ssize_t type_show(struct device *dev, struct device_attribute *attr, @@ -380,7 +388,7 @@ struct backlight_device *backlight_device_register(const char *name, } EXPORT_SYMBOL(backlight_device_register); -bool backlight_device_registered(enum backlight_type type) +struct backlight_device *backlight_device_get_by_type(enum backlight_type type) { bool found = false; struct backlight_device *bd; @@ -394,7 +402,13 @@ bool backlight_device_registered(enum backlight_type type) } mutex_unlock(&backlight_dev_list_mutex); - return found; + return found ? bd : NULL; +} +EXPORT_SYMBOL(backlight_device_get_by_type); + +bool backlight_device_registered(enum backlight_type type) +{ + return backlight_device_get_by_type(type) ? true : false; } EXPORT_SYMBOL(backlight_device_registered); diff --git a/include/acpi/video.h b/include/acpi/video.h index 843ef1a..956300d 100644 --- a/include/acpi/video.h +++ b/include/acpi/video.h @@ -3,6 +3,19 @@ #include /* for ENODEV */ +struct acpi_video_brightness_flags { + u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */ + u8 _BCL_reversed:1; /* _BCL package is in a reversed order */ + u8 _BQC_use_index:1; /* _BQC returns an index value */ +}; + +struct acpi_video_device_brightness { + int curr; + int count; + int *levels; + struct acpi_video_brightness_flags flags; +}; + struct acpi_device; #define ACPI_VIDEO_CLASS "video" @@ -22,6 +35,8 @@ extern void acpi_video_unregister(void); extern void acpi_video_unregister_backlight(void); extern int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, void **edid); +extern int acpi_video_get_levels(struct acpi_device *device, + struct acpi_video_device_brightness **dev_br); extern bool acpi_video_verify_backlight_support(void); #else static inline int acpi_video_register(void) { return 0; } @@ -32,6 +47,11 @@ static inline int acpi_video_get_edid(struct acpi_device *device, int type, { return -ENODEV; } +static int acpi_video_get_levels(struct acpi_device *device, + struct acpi_video_device_brightness **dev_br) +{ + return -ENODEV; +} static inline bool acpi_video_verify_backlight_support(void) { return false; } #endif diff --git a/include/linux/backlight.h b/include/linux/backlight.h index adb14a8..c59a020 100644 --- a/include/linux/backlight.h +++ b/include/linux/backlight.h @@ -140,6 +140,8 @@ extern void backlight_force_update(struct backlight_device *bd, extern bool backlight_device_registered(enum backlight_type type); extern int backlight_register_notifier(struct notifier_block *nb); extern int backlight_unregister_notifier(struct notifier_block *nb); +extern struct backlight_device *backlight_device_get_by_type(enum backlight_type type); +extern int backlight_device_set_brightness(struct backlight_device *bd, int brightness); #define to_backlight_device(obj) container_of(obj, struct backlight_device, dev) -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/