Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756149AbaGVPid (ORCPT ); Tue, 22 Jul 2014 11:38:33 -0400 Received: from smtprelay05.ispgateway.de ([80.67.31.94]:41337 "EHLO smtprelay05.ispgateway.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752846AbaGVPhV (ORCPT ); Tue, 22 Jul 2014 11:37:21 -0400 From: Peter Feuerer To: LKML Cc: Peter Feuerer , Andrew Morton , Zhang Rui , Andreas Mohr , Javi Merino Subject: [PATCH v5 4/6] acerhdf: Use bang-bang thermal governor Date: Tue, 22 Jul 2014 17:37:14 +0200 Message-Id: <1406043436-17068-5-git-send-email-peter@piie.net> X-Mailer: git-send-email 2.0.2 In-Reply-To: <1406043436-17068-1-git-send-email-peter@piie.net> References: <1398561815-22033-1-git-send-email-peter@piie.net> <1406043436-17068-1-git-send-email-peter@piie.net> X-Df-Sender: cGV0ZXJAcGlpZS5uZXQ= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org acerhdf has been doing an on-off fan control using hysteresis by post-manipulating the outcome of thermal subsystem trip point handling. This patch enables acerhdf to use the bang-bang governor, which is intended for on-off controlled fans. Cc: Andrew Morton CC: Zhang Rui Cc: Andreas Mohr Cc: Javi Merino Acked-and-tested-by: Borislav Petkov Signed-off-by: Peter Feuerer --- drivers/platform/x86/Kconfig | 3 ++- drivers/platform/x86/acerhdf.c | 36 +++++++++++++++++++++++++++++++----- 2 files changed, 33 insertions(+), 6 deletions(-) diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 172f26c..b5e80dc 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -38,7 +38,8 @@ config ACER_WMI config ACERHDF tristate "Acer Aspire One temperature and fan driver" - depends on THERMAL && ACPI + select THERMAL_GOV_BANG_BANG + depends on ACPI ---help--- This is a driver for Acer Aspire One netbooks. It allows to access the temperature sensor and to control the fan. diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c index f30767f..7fe7dbf 100644 --- a/drivers/platform/x86/acerhdf.c +++ b/drivers/platform/x86/acerhdf.c @@ -50,7 +50,7 @@ */ #undef START_IN_KERNEL_MODE -#define DRV_VER "0.5.30" +#define DRV_VER "0.7.0" /* * According to the Atom N270 datasheet, @@ -258,6 +258,14 @@ static const struct bios_settings_t bios_tbl[] = { static const struct bios_settings_t *bios_cfg __read_mostly; +/* + * this struct is used to instruct thermal layer to use bang_bang instead of + * default governor for acerhdf + */ +static struct thermal_zone_params acerhdf_zone_params = { + .governor_name = "bang_bang", +}; + static int acerhdf_get_temp(int *temp) { u8 read_temp; @@ -439,6 +447,17 @@ static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip, return 0; } +static int acerhdf_get_trip_hyst(struct thermal_zone_device *thermal, int trip, + unsigned long *temp) +{ + if (trip != 0) + return -EINVAL; + + *temp = fanon - fanoff; + + return 0; +} + static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip, unsigned long *temp) { @@ -463,6 +482,7 @@ static struct thermal_zone_device_ops acerhdf_dev_ops = { .get_mode = acerhdf_get_mode, .set_mode = acerhdf_set_mode, .get_trip_type = acerhdf_get_trip_type, + .get_trip_hyst = acerhdf_get_trip_hyst, .get_trip_temp = acerhdf_get_trip_temp, .get_crit_temp = acerhdf_get_crit_temp, }; @@ -515,9 +535,7 @@ static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev, } if (state == 0) { - /* turn fan off only if below fanoff temperature */ - if ((cur_state == ACERHDF_FAN_AUTO) && - (cur_temp < fanoff)) + if (cur_state == ACERHDF_FAN_AUTO) acerhdf_change_fanstate(ACERHDF_FAN_OFF); } else { if (cur_state == ACERHDF_FAN_OFF) @@ -696,11 +714,19 @@ static int acerhdf_register_thermal(void) return -EINVAL; thz_dev = thermal_zone_device_register("acerhdf", 1, 0, NULL, - &acerhdf_dev_ops, NULL, 0, + &acerhdf_dev_ops, + &acerhdf_zone_params, 0, (kernelmode) ? interval*1000 : 0); if (IS_ERR(thz_dev)) return -EINVAL; + if (strcmp(thz_dev->governor->name, + acerhdf_zone_params.governor_name)) { + pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n", + acerhdf_zone_params.governor_name); + return -EINVAL; + } + return 0; } -- 2.0.2 -- 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/