Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753089AbdC0KEf (ORCPT ); Mon, 27 Mar 2017 06:04:35 -0400 Received: from mail1.bemta5.messagelabs.com ([195.245.231.151]:58462 "EHLO mail1.bemta5.messagelabs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752960AbdC0KEO (ORCPT ); Mon, 27 Mar 2017 06:04:14 -0400 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrKKsWRWlGSWpSXmKPExsUSt3OpsS7D4xs RBnNe8VpMffiEzWL+kXOsFocXvWC0mH/lGqvF/a9HGS2+Xelgsrj56RurxeVdc9gsPvceYbS4 sW4fu8WThWeYLBY2tbBbLL1+kcmide8RoNjDPjaLyxM72S1uzXjB6iDosWbeGkaPnbPusntc2 yzmsXjPSyaPTas62TzuXNvD5rHzewO7x+dNcgEcUayZeUn5FQmsGQ8uX2UqmF5aMXftGZYGxv 9JXYxcHEIC6xklbj7/y9bFyAnkVEgs/3YJzOYVSJZYv/A4K4jNKeAo8fvUalaIGgeJF2u+MYH YbAKGEvPevGcEsVkEVCXW3TsOFhcWiJboWDaXBcQWEZjPKHHotj7IMmaBDhaJnxuuQy0QlDg5 8wlYEbOAhMTBFy+Yuxg5gBZoSSw/FgkSlhCwl5j+/ipYWEJAX6LxWCxE2FDi+6xvLBC2ucTtL /9ZJjAKzkIydBaSoQsYmVYxqhenFpWlFuka6SUVZaZnlOQmZuboGhqY6uWmFhcnpqfmJCYV6y Xn525iBEYfAxDsYPz+x+kQoyQHk5Io74fTNyKE+JLyUyozEosz4otKc1KLDzHKcHAoSfCufQi UEyxKTU+tSMvMAaYBmLQEB4+SCK8lSJq3uCAxtzgzHSJ1ilFRSpx3HkhCACSRUZoH1wZLPZcY ZaWEeRmBDhHiKUgtys0sQZV/xSjOwagkzGsDMoUnM68EbvoroMVMQIsPzwdbXJKIkJJqYJzkl rTBJ93l04sdO5jrw3fGZnYVfU6p3ym2unXPxbQvq351fVe/L/mwNFb+U2Fo+an1Cx+eW8CxW5 C1pqEmfarUjLNKkxed1JxjYCdZtkFTYG8S/6YQOf+7jDHrFx11XjmlqT/3iOQfuZj/70qalAX /ML79Lt+1N4elOto8NvdIReW0oIADIUosxRmJhlrMRcWJAPCgfBw4AwAA X-Env-Sender: stwiss.opensource@diasemi.com X-Msg-Ref: server-11.tower-180.messagelabs.com!1490608893!85914456!6 X-Originating-IP: [94.185.165.51] X-StarScan-Received: X-StarScan-Version: 9.2.3; banners=-,-,- X-VirusChecked: Checked Message-ID: <3d5a42b417a0c5eaf2336e680b5d5f66aad4622f.1490608293.git.stwiss.opensource@diasemi.com> In-Reply-To: References: From: Steve Twiss Date: Mon, 27 Mar 2017 10:51:33 +0100 Subject: [PATCH V6 6/7] thermal: da9062/61: Thermal junction temperature monitoring driver To: Eduardo Valentin , LINUX-KERNEL , LINUX-PM , Zhang Rui CC: DEVICETREE , Dmitry Torokhov , Guenter Roeck , LINUX-INPUT , LINUX-WATCHDOG , Lee Jones , Liam Girdwood , Lukasz Luba , Mark Brown , Mark Rutland , Rob Herring , Support Opensource , Wim Van Sebroeck MIME-Version: 1.0 Content-Type: text/plain X-KSE-AttachmentFiltering-Interceptor-Info: protection disabled X-KSE-ServerInfo: sw-ex-cashub01.diasemi.com, 9 X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: Clean, bases: 27/03/2017 08:32:00 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 14998 Lines: 459 From: Steve Twiss Add junction temperature monitoring supervisor device driver, compatible with the DA9062 and DA9061 PMICs. A MODULE_DEVICE_TABLE() macro is added. If the PMIC's internal junction temperature rises above T_WARN (125 degC) an interrupt is issued. This T_WARN level is defined as the THERMAL_TRIP_HOT trip-wire inside the device driver. The thermal triggering mechanism is interrupt based and happens when the temperature rises above a given threshold level. The component cannot return an exact temperature, it only has knowledge if the temperature is above or below a given threshold value. A status bit must be polled to detect when the temperature falls below that threshold level again. A kernel work queue is configured to repeatedly poll and detect when the temperature falls below this trip-wire, between 1 and 10 second intervals (defaulting at 3 seconds). This scheme is provided as an example. It would be expected that any final implementation will also include a notify() function and any of these settings could be altered to match the application where appropriate. When over-temperature is reached, the interrupt from the DA9061/2 will be repeatedly triggered. The IRQ is therefore disabled when the first over-temperature event happens and the status bit is polled using a work-queue until it becomes false. This strategy is designed to allow the periodic transmission of uevents (HOT trip point) as the first level of temperature supervision method. It is intended for non-invasive temperature control, where the necessary measures for cooling the system down are left to the host software. Once the temperature falls again, the IRQ is re-enabled so a new critical over-temperature event can be detected. Reviewed-by: Lukasz Luba Signed-off-by: Steve Twiss --- This patch applies against linux-next and v4.11-rc3 v5 -> v6 - Patch renamed from [PATCH V5 7/8] to [PATCH V6 6/7] - Rebased from v4.9 to v4.11-rc3 - Modify Copyright to match Dialog latest legal statement - Various checkpatch warnings (from --strict) have been fixed - Added COMPILE_TEST to Kconfig v4 -> v5 - Rebased from v4.8 to v4.9 - Updates from comments by Eduardo Valentin - Replace vendor defined dlg,tjunc-temp-polling-period-ms with standard thermal core polling-delay-passive as part of the device tree initialisation - Change to the commit message content and device driver source code to include an explanation of the repeated uevent strategy for monitoring over-temperature - Rename warning threshold name from TEMP_WARN to T_WARN to match the latest datasheet naming convention - Added reviewed-by Lukasz Luba to commit message v3 -> v4 - Patch renamed from [PATCH V3 8/9] to [PATCH V4 7/8] - Reordering of cancel_delayed_work_sync() in remove function - dev_warn() message for out-of-range polling period requests - Explanatory comment for expected values defined for DEFAULT_POLLING_MS_PERIOD, MAX_POLLING_MS_PERIOD and MIN_POLLING_MS_PERIOD v2 -> v3 - Patch renamed from [PATCH V2 09/10] to [PATCH V3 8/9] - Addition of MODULE_DEVICE_TABLE macro to allow modinfo additions v1 -> v2 - Patch renamed from [PATCH V1 05/10] to [PATCH V2 09/10] -- these changes were made to fix checkpatch warnings caused by the patch set dependency order - List the header files in alphabetical order - Remove "GPL v2" and replace with MODULE_LICENSE("GPL") to match the copyright "GNU Public License v2 or later" option in the header comment for this file. See the allowed identifiers in the file include/linux/module.h +170 - Remove notify function "da9062_thermal_notify" function. - MODULE_AUTHOR() macros removes Company Name and just gives Name in accordance with include/linux/module.h +200 - Remove the compatible "dlg,da9061-thermal" option in the of_device_id struct table. This patch now assumes the use of a DA9062 fallback compatible string in the DTS when using the DA9061 thermal component of the DA9061 device. - Re-ordered some assignments earlier in the probe() for thermal->hw, thermal->polling_period, thermal->mode, thermal->dev - Added further information in the patch description to explain the use of the device driver's built-in work-queue. Regards, Steve Twiss, Dialog Semiconductor drivers/thermal/Kconfig | 10 ++ drivers/thermal/Makefile | 1 + drivers/thermal/da9062-thermal.c | 315 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 326 insertions(+) create mode 100644 drivers/thermal/da9062-thermal.c diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 776b3439..a784b02 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -303,6 +303,16 @@ config DB8500_CPUFREQ_COOLING bound cpufreq cooling device turns active to set CPU frequency low to cool down the CPU. +config DA9062_THERMAL + tristate "DA9062/DA9061 Dialog Semiconductor thermal driver" + depends on MFD_DA9062 || COMPILE_TEST + depends on OF + help + Enable this for the Dialog Semiconductor thermal sensor driver. + This will report PMIC junction over-temperature for one thermal trip + zone. + Compatible with the DA9062 and DA9061 PMICs. + config INTEL_POWERCLAMP tristate "Intel PowerClamp idle injection driver" depends on THERMAL diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 7adae20..297849e 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -42,6 +42,7 @@ obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o obj-$(CONFIG_MAX77620_THERMAL) += max77620_thermal.o obj-$(CONFIG_QORIQ_THERMAL) += qoriq_thermal.o obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o +obj-$(CONFIG_DA9062_THERMAL) += da9062-thermal.o obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o obj-$(CONFIG_X86_PKG_TEMP_THERMAL) += x86_pkg_temp_thermal.o obj-$(CONFIG_INTEL_SOC_DTS_IOSF_CORE) += intel_soc_dts_iosf.o diff --git a/drivers/thermal/da9062-thermal.c b/drivers/thermal/da9062-thermal.c new file mode 100644 index 0000000..dd8dd94 --- /dev/null +++ b/drivers/thermal/da9062-thermal.c @@ -0,0 +1,315 @@ +/* + * Thermal device driver for DA9062 and DA9061 + * Copyright (C) 2017 Dialog Semiconductor + * + * 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. + */ + +/* When over-temperature is reached, an interrupt from the device will be + * triggered. Following this event the interrupt will be disabled and + * periodic transmission of uevents (HOT trip point) should define the + * first level of temperature supervision. It is expected that any final + * implementation of the thermal driver will include a .notify() function + * to implement these uevents to userspace. + * + * These uevents are intended to indicate non-invasive temperature control + * of the system, where the necessary measures for cooling are the + * responsibility of the host software. Once the temperature falls again, + * the IRQ is re-enabled so the start of a new over-temperature event can + * be detected without constant software monitoring. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +/* Minimum, maximum and default polling millisecond periods are provided + * here as an example. It is expected that any final implementation to also + * include a modification of these settings to match the required + * application. + */ +#define DA9062_DEFAULT_POLLING_MS_PERIOD 3000 +#define DA9062_MAX_POLLING_MS_PERIOD 10000 +#define DA9062_MIN_POLLING_MS_PERIOD 1000 + +#define DA9062_MILLI_CELSIUS(t) ((t) * 1000) + +struct da9062_thermal_config { + const char *name; +}; + +struct da9062_thermal { + struct da9062 *hw; + struct delayed_work work; + struct thermal_zone_device *zone; + enum thermal_device_mode mode; + struct mutex lock; /* protection for da9062_thermal temperature */ + int temperature; + int irq; + const struct da9062_thermal_config *config; + struct device *dev; +}; + +static void da9062_thermal_poll_on(struct work_struct *work) +{ + struct da9062_thermal *thermal = container_of(work, + struct da9062_thermal, + work.work); + unsigned long delay; + unsigned int val; + int ret; + + /* clear E_TEMP */ + ret = regmap_write(thermal->hw->regmap, + DA9062AA_EVENT_B, + DA9062AA_E_TEMP_MASK); + if (ret < 0) { + dev_err(thermal->dev, + "Cannot clear the TJUNC temperature status\n"); + goto err_enable_irq; + } + + /* Now read E_TEMP again: it is acting like a status bit. + * If over-temperature, then this status will be true. + * If not over-temperature, this status will be false. + */ + ret = regmap_read(thermal->hw->regmap, + DA9062AA_EVENT_B, + &val); + if (ret < 0) { + dev_err(thermal->dev, + "Cannot check the TJUNC temperature status\n"); + goto err_enable_irq; + } + + if (val & DA9062AA_E_TEMP_MASK) { + mutex_lock(&thermal->lock); + thermal->temperature = DA9062_MILLI_CELSIUS(125); + mutex_unlock(&thermal->lock); + thermal_zone_device_update(thermal->zone, + THERMAL_EVENT_UNSPECIFIED); + + delay = msecs_to_jiffies(thermal->zone->passive_delay); + schedule_delayed_work(&thermal->work, delay); + return; + } + + mutex_lock(&thermal->lock); + thermal->temperature = DA9062_MILLI_CELSIUS(0); + mutex_unlock(&thermal->lock); + thermal_zone_device_update(thermal->zone, + THERMAL_EVENT_UNSPECIFIED); + +err_enable_irq: + enable_irq(thermal->irq); +} + +static irqreturn_t da9062_thermal_irq_handler(int irq, void *data) +{ + struct da9062_thermal *thermal = data; + + disable_irq_nosync(thermal->irq); + schedule_delayed_work(&thermal->work, 0); + + return IRQ_HANDLED; +} + +static int da9062_thermal_get_mode(struct thermal_zone_device *z, + enum thermal_device_mode *mode) +{ + struct da9062_thermal *thermal = z->devdata; + *mode = thermal->mode; + return 0; +} + +static int da9062_thermal_get_trip_type(struct thermal_zone_device *z, + int trip, + enum thermal_trip_type *type) +{ + struct da9062_thermal *thermal = z->devdata; + + switch (trip) { + case 0: + *type = THERMAL_TRIP_HOT; + break; + default: + dev_err(thermal->dev, + "Driver does not support more than 1 trip-wire\n"); + return -EINVAL; + } + + return 0; +} + +static int da9062_thermal_get_trip_temp(struct thermal_zone_device *z, + int trip, + int *temp) +{ + struct da9062_thermal *thermal = z->devdata; + + switch (trip) { + case 0: + *temp = DA9062_MILLI_CELSIUS(125); + break; + default: + dev_err(thermal->dev, + "Driver does not support more than 1 trip-wire\n"); + return -EINVAL; + } + + return 0; +} + +static int da9062_thermal_get_temp(struct thermal_zone_device *z, + int *temp) +{ + struct da9062_thermal *thermal = z->devdata; + + mutex_lock(&thermal->lock); + *temp = thermal->temperature; + mutex_unlock(&thermal->lock); + + return 0; +} + +static struct thermal_zone_device_ops da9062_thermal_ops = { + .get_temp = da9062_thermal_get_temp, + .get_mode = da9062_thermal_get_mode, + .get_trip_type = da9062_thermal_get_trip_type, + .get_trip_temp = da9062_thermal_get_trip_temp, +}; + +static const struct da9062_thermal_config da9062_config = { + .name = "da9062-thermal", +}; + +static const struct of_device_id da9062_compatible_reg_id_table[] = { + { .compatible = "dlg,da9062-thermal", .data = &da9062_config }, + { }, +}; + +MODULE_DEVICE_TABLE(of, da9062_compatible_reg_id_table); + +static int da9062_thermal_probe(struct platform_device *pdev) +{ + struct da9062 *chip = dev_get_drvdata(pdev->dev.parent); + struct da9062_thermal *thermal; + unsigned int pp_tmp = DA9062_DEFAULT_POLLING_MS_PERIOD; + const struct of_device_id *match; + int ret = 0; + + match = of_match_node(da9062_compatible_reg_id_table, + pdev->dev.of_node); + if (!match) + return -ENXIO; + + if (pdev->dev.of_node) { + if (!of_property_read_u32(pdev->dev.of_node, + "polling-delay-passive", + &pp_tmp)) { + if (pp_tmp < DA9062_MIN_POLLING_MS_PERIOD || + pp_tmp > DA9062_MAX_POLLING_MS_PERIOD) { + dev_warn(&pdev->dev, + "Out-of-range polling period %d ms\n", + pp_tmp); + pp_tmp = DA9062_DEFAULT_POLLING_MS_PERIOD; + } + } + } + + thermal = devm_kzalloc(&pdev->dev, sizeof(struct da9062_thermal), + GFP_KERNEL); + if (!thermal) { + ret = -ENOMEM; + goto err; + } + + thermal->config = match->data; + thermal->hw = chip; + thermal->mode = THERMAL_DEVICE_ENABLED; + thermal->dev = &pdev->dev; + + INIT_DELAYED_WORK(&thermal->work, da9062_thermal_poll_on); + mutex_init(&thermal->lock); + + thermal->zone = thermal_zone_device_register(thermal->config->name, + 1, 0, thermal, + &da9062_thermal_ops, NULL, pp_tmp, + 0); + if (IS_ERR(thermal->zone)) { + dev_err(&pdev->dev, "Cannot register thermal zone device\n"); + ret = PTR_ERR(thermal->zone); + goto err; + } + + dev_dbg(&pdev->dev, + "TJUNC temperature polling period set at %d ms\n", + thermal->zone->passive_delay); + + ret = platform_get_irq_byname(pdev, "THERMAL"); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to get platform IRQ.\n"); + goto err_zone; + } + thermal->irq = ret; + + ret = request_threaded_irq(thermal->irq, NULL, + da9062_thermal_irq_handler, + IRQF_TRIGGER_LOW | IRQF_ONESHOT, + "THERMAL", thermal); + if (ret) { + dev_err(&pdev->dev, + "Failed to request thermal device IRQ.\n"); + goto err_zone; + } + + platform_set_drvdata(pdev, thermal); + return 0; + +err_zone: + thermal_zone_device_unregister(thermal->zone); +err: + return ret; +} + +static int da9062_thermal_remove(struct platform_device *pdev) +{ + struct da9062_thermal *thermal = platform_get_drvdata(pdev); + + free_irq(thermal->irq, thermal); + cancel_delayed_work_sync(&thermal->work); + thermal_zone_device_unregister(thermal->zone); + return 0; +} + +static struct platform_driver da9062_thermal_driver = { + .probe = da9062_thermal_probe, + .remove = da9062_thermal_remove, + .driver = { + .name = "da9062-thermal", + .of_match_table = da9062_compatible_reg_id_table, + }, +}; + +module_platform_driver(da9062_thermal_driver); + +MODULE_AUTHOR("Steve Twiss"); +MODULE_DESCRIPTION("Thermal TJUNC device driver for Dialog DA9062 and DA9061"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:da9062-thermal"); -- end-of-patch for PATCH V6