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Date: Tue, 6 Nov 2012 18:30:10 +0800
From: Hongbo Zhang <hongbo.zhang@...aro.org>
To: "Zhang, Rui" <rui.zhang@...el.com>
Cc: "linaro-dev@...ts.linaro.org" <linaro-dev@...ts.linaro.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
"amit.kachhap@...aro.org" <amit.kachhap@...aro.org>,
"patches@...aro.org" <patches@...aro.org>,
"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
"STEricsson_nomadik_linux@...t.st.com"
<STEricsson_nomadik_linux@...t.st.com>,
"kernel@...oocommunity.org" <kernel@...oocommunity.org>,
"hongbo.zhang" <hongbo.zhang@...aro.com>
Subject: Re: [PATCH V3 4/5] Thermal: Add ST-Ericsson DB8500 thermal driver.
On 6 November 2012 18:17, Hongbo Zhang <hongbo.zhang@...aro.org> wrote:
> On 1 November 2012 09:52, Zhang, Rui <rui.zhang@...el.com> wrote:
>>
>>
>>> -----Original Message-----
>>> From: hongbo.zhang [mailto:hongbo.zhang@...aro.org]
>>> Sent: Wednesday, October 31, 2012 12:49 AM
>>> To: linaro-dev@...ts.linaro.org; linux-kernel@...r.kernel.org; linux-
>>> pm@...r.kernel.org; Zhang, Rui; amit.kachhap@...aro.org
>>> Cc: patches@...aro.org; linaro-kernel@...ts.linaro.org;
>>> STEricsson_nomadik_linux@...t.st.com; kernel@...oocommunity.org;
>>> hongbo.zhang
>>> Subject: [PATCH V3 4/5] Thermal: Add ST-Ericsson DB8500 thermal driver.
>>> Importance: High
>>>
>>> From: "hongbo.zhang" <hongbo.zhang@...aro.com>
>>>
>>> This diver is based on the thermal management framework in
>>> thermal_sys.c. A thermal zone device is created with the trip points to
>>> which cooling devices can be bound, the current cooling device is
>>> cpufreq, e.g. CPU frequency is clipped down to cool the CPU, and other
>>> cooling devices can be added and bound to the trip points dynamically.
>>> The platform specific PRCMU interrupts are used to active thermal
>>> update when trip points are reached.
>>>
>>> Signed-off-by: hongbo.zhang <hongbo.zhang@...aro.com>
>>> ---
>>> .../devicetree/bindings/thermal/db8500-thermal.txt | 40 ++
>>> drivers/thermal/Kconfig | 20 +
>>> drivers/thermal/Makefile | 2 +
>>> drivers/thermal/db8500_cpufreq_cooling.c | 108 +++++
>>> drivers/thermal/db8500_thermal.c | 531
>>> +++++++++++++++++++++
>>> include/linux/platform_data/db8500_thermal.h | 38 ++
>>> 6 files changed, 739 insertions(+)
>>> create mode 100644 Documentation/devicetree/bindings/thermal/db8500-
>>> thermal.txt
>>> create mode 100644 drivers/thermal/db8500_cpufreq_cooling.c
>>> create mode 100644 drivers/thermal/db8500_thermal.c create mode
>>> 100644 include/linux/platform_data/db8500_thermal.h
>>>
>>> diff --git a/Documentation/devicetree/bindings/thermal/db8500-
>>> thermal.txt b/Documentation/devicetree/bindings/thermal/db8500-
>>> thermal.txt
>>> new file mode 100644
>>> index 0000000..cab6916
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/thermal/db8500-thermal.txt
>>> @@ -0,0 +1,40 @@
>>> +* ST-Ericsson DB8500 Thermal
>>> +
>>> +** Thermal node properties:
>>> +
>>> +- compatible : "stericsson,db8500-thermal";
>>> +- reg : address range of the thermal sensor registers;
>>> +- interrupts : interrupts generated from PRCMU;
>>> +- interrupt-names : "IRQ_HOTMON_LOW" and "IRQ_HOTMON_HIGH";
>>> +- num-trips : number of total trip points;
>>> +- tripN-temp : temperature of trip point N, should be in ascending
>>> +order;
>>> +- tripN-type : type of trip point N, should be one of "active"
>>> +"passive" "hot" "critical";
>>> +- tripN-cdev-num : number of the cooling devices which can be bound to
>>> +trip point N;
>>> +- tripN-cdev-nameM : name of the No. M cooling device of trip point N;
>>> +
>>> +Usually the num-trips and tripN-*** are separated in board related dts
>>> files.
>>> +
>>> +Example:
>>> +thermal@...573c0 {
>>> + compatible = "stericsson,db8500-thermal";
>>> + reg = <0x801573c0 0x40>;
>>> + interrupts = <21 0x4>, <22 0x4>;
>>> + interrupt-names = "IRQ_HOTMON_LOW", "IRQ_HOTMON_HIGH";
>>> +
>>> + num-trips = <3>;
>>> +
>>> + trip0-temp = <70000>;
>>> + trip0-type = "active";
>>> + trip0-cdev-num = <1>;
>>> + trip0-cdev-name0 = "thermal-cpufreq-0";
>>> +
>>> + trip1-temp = <75000>;
>>> + trip1-type = "active";
>>> + trip1-cdev-num = <2>;
>>> + trip1-cdev-name0 = "thermal-cpufreq-0";
>>> + trip1-cdev-name1 = "thermal-fan";
>>> +
>>> + trip2-temp = <85000>;
>>> + trip2-type = "critical";
>>> + trip2-cdev-num = <0>;
>>> +}
>>> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index
>>> e1cb6bd..54c8fd0 100644
>>> --- a/drivers/thermal/Kconfig
>>> +++ b/drivers/thermal/Kconfig
>>> @@ -31,6 +31,26 @@ config CPU_THERMAL
>>> and not the ACPI interface.
>>> If you want this support, you should say Y here.
>>>
>>> +config DB8500_THERMAL
>>> + bool "DB8500 thermal management"
>>> + depends on THERMAL
>>> + default y
>>> + help
>>> + Adds DB8500 thermal management implementation according to the
>>> thermal
>>> + management framework. A thermal zone with several trip points
>>> will be
>>> + created. Cooling devices can be bound to the trip points to
>>> cool this
>>> + thermal zone if trip points reached.
>>> +
>>> +config DB8500_CPUFREQ_COOLING
>>> + tristate "DB8500 cpufreq cooling"
>>> + depends on CPU_THERMAL
>>> + default y
>>> + help
>>> + Adds DB8500 cpufreq cooling devices, and these cooling devices
>>> can be
>>> + bound to thermal zone trip points. When a trip point reached,
>>> the
>>> + bound cpufreq cooling device turns active to set CPU frequency
>>> low to
>>> + cool down the CPU.
>>> +
>>> config SPEAR_THERMAL
>>> bool "SPEAr thermal sensor driver"
>>> depends on THERMAL
>>> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index
>>> 885550d..c7a8dab 100644
>>> --- a/drivers/thermal/Makefile
>>> +++ b/drivers/thermal/Makefile
>>> @@ -7,3 +7,5 @@ obj-$(CONFIG_CPU_THERMAL) += cpu_cooling.o
>>> obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
>>> obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o
>>> obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o
>>> +obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o
>>> +obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o
>>> diff --git a/drivers/thermal/db8500_cpufreq_cooling.c
>>> b/drivers/thermal/db8500_cpufreq_cooling.c
>>> new file mode 100644
>>> index 0000000..4cf8e72
>>> --- /dev/null
>>> +++ b/drivers/thermal/db8500_cpufreq_cooling.c
>>> @@ -0,0 +1,108 @@
>>> +/*
>>> + * db8500_cpufreq_cooling.c - DB8500 cpufreq works as cooling device.
>>> + *
>>> + * Copyright (C) 2012 ST-Ericsson
>>> + * Copyright (C) 2012 Linaro Ltd.
>>> + *
>>> + * Author: Hongbo Zhang <hongbo.zhang@...aro.com>
>>> + *
>>> + * 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.
>>> + */
>>> +
>>> +#include <linux/cpu_cooling.h>
>>> +#include <linux/cpufreq.h>
>>> +#include <linux/err.h>
>>> +#include <linux/module.h>
>>> +#include <linux/platform_device.h>
>>> +#include <linux/slab.h>
>>> +
>>> +static int db8500_cpufreq_cooling_probe(struct platform_device *pdev)
>>> {
>>> + struct thermal_cooling_device *cdev;
>>> + struct cpumask mask_val;
>>> +
>>> + /* make sure cpufreq driver has been initialized */
>>> + if (!cpufreq_frequency_get_table(0))
>>> + return -EPROBE_DEFER;
>>> +
>>> + cpumask_set_cpu(0, &mask_val);
>>> + cdev = cpufreq_cooling_register(&mask_val);
>>> +
>>> + if (IS_ERR_OR_NULL(cdev)) {
>>> + dev_err(&pdev->dev, "Failed to register cooling device\n");
>>> + return PTR_ERR(cdev);
>>> + }
>>> +
>>> + platform_set_drvdata(pdev, cdev);
>>> +
>>> + dev_info(&pdev->dev, "Cooling device registered: %s\n", cdev-
>>> >type);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int db8500_cpufreq_cooling_remove(struct platform_device *pdev)
>>> +{
>>> + struct thermal_cooling_device *cdev = platform_get_drvdata(pdev);
>>> +
>>> + cpufreq_cooling_unregister(cdev);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int db8500_cpufreq_cooling_suspend(struct platform_device *pdev,
>>> + pm_message_t state)
>>> +{
>>> + return -ENOSYS;
>>> +}
>>> +
>>> +static int db8500_cpufreq_cooling_resume(struct platform_device *pdev)
>>> +{
>>> + return -ENOSYS;
>>> +}
>>> +
>>> +#ifdef CONFIG_OF
>>> +static const struct of_device_id db8500_cpufreq_cooling_match[] = {
>>> + { .compatible = "stericsson,db8500-cpufreq-cooling" },
>>> + {},
>>> +};
>>> +#else
>>> +#define db8500_cpufreq_cooling_match NULL #endif
>>> +
>>> +static struct platform_driver db8500_cpufreq_cooling_driver = {
>>> + .driver = {
>>> + .owner = THIS_MODULE,
>>> + .name = "db8500-cpufreq-cooling",
>>> + .of_match_table = db8500_cpufreq_cooling_match,
>>> + },
>>> + .probe = db8500_cpufreq_cooling_probe,
>>> + .suspend = db8500_cpufreq_cooling_suspend,
>>> + .resume = db8500_cpufreq_cooling_resume,
>>> + .remove = db8500_cpufreq_cooling_remove, };
>>> +
>>> +static int __init db8500_cpufreq_cooling_init(void) {
>>> + return platform_driver_register(&db8500_cpufreq_cooling_driver);
>>> +}
>>> +
>>> +static void __exit db8500_cpufreq_cooling_exit(void) {
>>> + platform_driver_unregister(&db8500_cpufreq_cooling_driver);
>>> +}
>>> +
>>> +/* Should be later than db8500_cpufreq_register */
>>> +late_initcall(db8500_cpufreq_cooling_init);
>>> +module_exit(db8500_cpufreq_cooling_exit);
>>> +
>>> +MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@...ricsson.com>");
>>> +MODULE_DESCRIPTION("DB8500 cpufreq cooling driver");
>>> +MODULE_LICENSE("GPL");
>>> diff --git a/drivers/thermal/db8500_thermal.c
>>> b/drivers/thermal/db8500_thermal.c
>>> new file mode 100644
>>> index 0000000..023f7b4
>>> --- /dev/null
>>> +++ b/drivers/thermal/db8500_thermal.c
>>> @@ -0,0 +1,531 @@
>>> +/*
>>> + * db8500_thermal.c - DB8500 Thermal Management Implementation
>>> + *
>>> + * Copyright (C) 2012 ST-Ericsson
>>> + * Copyright (C) 2012 Linaro Ltd.
>>> + *
>>> + * Author: Hongbo Zhang <hongbo.zhang@...aro.com>
>>> + *
>>> + * 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.
>>> + */
>>> +
>>> +#include <linux/cpu_cooling.h>
>>> +#include <linux/interrupt.h>
>>> +#include <linux/mfd/dbx500-prcmu.h>
>>> +#include <linux/module.h>
>>> +#include <linux/of.h>
>>> +#include <linux/platform_data/db8500_thermal.h>
>>> +#include <linux/platform_device.h>
>>> +#include <linux/slab.h>
>>> +#include <linux/thermal.h>
>>> +
>>> +#define PRCMU_DEFAULT_MEASURE_TIME 0xFFF
>>> +#define PRCMU_DEFAULT_LOW_TEMP 0
>>> +
>>> +struct db8500_thermal_zone {
>>> + struct thermal_zone_device *therm_dev;
>>> + struct mutex th_lock;
>>> + struct work_struct therm_work;
>>> + struct db8500_thsens_platform_data *trip_tab;
>>> + enum thermal_device_mode mode;
>>> + enum thermal_trend trend;
>>> + unsigned long cur_temp_pseudo;
>>> + unsigned int cur_index;
>>> +};
>>> +
>>> +/* Local function to check if thermal zone matches cooling devices */
>>> +static int db8500_thermal_match_cdev(struct thermal_cooling_device
>>> *cdev,
>>> + struct db8500_trip_point *trip_points) {
>>> + int i;
>>> + char *cdev_name;
>>> +
>>> + if (!strlen(cdev->type))
>>> + return -EINVAL;
>>> +
>>> + for (i = 0; i < COOLING_DEV_MAX; i++) {
>>> + cdev_name = trip_points->cdev_name[i];
>>> + if (!strcmp(cdev_name, cdev->type))
>>> + return 0;
>>> + }
>>> +
>>> + return -ENODEV;
>>> +}
>>> +
>>> +/* Callback to bind cooling device to thermal zone */ static int
>>> +db8500_cdev_bind(struct thermal_zone_device *thermal,
>>> + struct thermal_cooling_device *cdev)
>>> +{
>>> + struct db8500_thermal_zone *pzone = thermal->devdata;
>>> + struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
>>> + unsigned long max_state, upper, lower;
>>> + int i, ret = -EINVAL;
>>> +
>>> + for (i = 0; i < ptrips->num_trips; i++) {
>>> + if (db8500_thermal_match_cdev(cdev, &ptrips-
>>> >trip_points[i]))
>>> + continue;
>>> +
>>> + cdev->ops->get_max_state(cdev, &max_state);
>>
>> Why not moving this line out of the loop
>> so that you only need to call it once.
> Good.
>
>>
>>> + lower = upper = (i > max_state) ? max_state : i;
>>> +
>>
>> What does this mean?
>> Say cooling device 0 matches trip point 3, and you want to use cooling state 3 only, for trip point 3?
>> No matter how many cooling states the cooling device supports?
> I would like to change lower = upper - 1 > 0 ? upper - 1 : 0;
> More states for one trip point is meaningless on my platform, because
> thermal framework polling thread isn't used, a PRCMU firmware high/low
> interrupts are used to trigger thermal update instead(currently
> platform limitation), thus thermal update is called only once when
> trip point is crossed up/down.
> More states for one trip points can be used on our SOC serials in
> future when this limitation is removed.
Sorry for update:
callback this "lower = upper - 1 > 0 ? upper - 1 : 0;"
current setting works as explained above, this is platform specific.
>>
>> Thanks,
>> rui
>>> + ret = thermal_zone_bind_cooling_device(thermal, i, cdev,
>>> + upper, lower);
>>> +
>>> + dev_info(&cdev->device, "%s bind to %d: %d-%s\n",
>>> + cdev->type, i, ret, ret ? "fail" : "succeed");
>>> + }
>>> +
>>> + return ret;
>>> +}
>>> +
>>> +/* Callback to unbind cooling device from thermal zone */ static int
>>> +db8500_cdev_unbind(struct thermal_zone_device *thermal,
>>> + struct thermal_cooling_device *cdev)
>>> +{
>>> + struct db8500_thermal_zone *pzone = thermal->devdata;
>>> + struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
>>> + int i, ret = -EINVAL;
>>> +
>>> + for (i = 0; i < ptrips->num_trips; i++) {
>>> + if (db8500_thermal_match_cdev(cdev, &ptrips-
>>> >trip_points[i]))
>>> + continue;
>>> +
>>> + ret = thermal_zone_unbind_cooling_device(thermal, i, cdev);
>>> +
>>> + dev_info(&cdev->device, "%s unbind: %s\n",
>>> + cdev->type, ret ? "fail" : "succeed");
>>> + }
>>> +
>>> + return ret;
>>> +}
>>> +
>>> +/* Callback to get current temperature */ static int
>>> +db8500_sys_get_temp(struct thermal_zone_device *thermal,
>>> + unsigned long *temp)
>>> +{
>>> + struct db8500_thermal_zone *pzone = thermal->devdata;
>>> +
>>> + /*
>>> + * TODO: There is no PRCMU interface to get temperature data
>>> currently,
>>> + * so a pseudo temperature is returned , it works for thermal
>>> framework
>>> + * and this will be fixed when the PRCMU interface is available.
>>> + */
>>> + *temp = pzone->cur_temp_pseudo;
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +/* Callback to get temperature changing trend */ static int
>>> +db8500_sys_get_trend(struct thermal_zone_device *thermal,
>>> + int trip, enum thermal_trend *trend)
>>> +{
>>> + struct db8500_thermal_zone *pzone = thermal->devdata;
>>> +
>>> + *trend = pzone->trend;
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +/* Callback to get thermal zone mode */ static int
>>> +db8500_sys_get_mode(struct thermal_zone_device *thermal,
>>> + enum thermal_device_mode *mode)
>>> +{
>>> + struct db8500_thermal_zone *pzone = thermal->devdata;
>>> +
>>> + mutex_lock(&pzone->th_lock);
>>> + *mode = pzone->mode;
>>> + mutex_unlock(&pzone->th_lock);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +/* Callback to set thermal zone mode */ static int
>>> +db8500_sys_set_mode(struct thermal_zone_device *thermal,
>>> + enum thermal_device_mode mode)
>>> +{
>>> + struct db8500_thermal_zone *pzone = thermal->devdata;
>>> +
>>> + mutex_lock(&pzone->th_lock);
>>> +
>>> + pzone->mode = mode;
>>> + if (mode == THERMAL_DEVICE_ENABLED)
>>> + schedule_work(&pzone->therm_work);
>>> +
>>> + mutex_unlock(&pzone->th_lock);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +/* Callback to get trip point type */
>>> +static int db8500_sys_get_trip_type(struct thermal_zone_device
>>> *thermal,
>>> + int trip, enum thermal_trip_type *type) {
>>> + struct db8500_thermal_zone *pzone = thermal->devdata;
>>> + struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
>>> +
>>> + if (trip >= ptrips->num_trips)
>>> + return -EINVAL;
>>> +
>>> + *type = ptrips->trip_points[trip].type;
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +/* Callback to get trip point temperature */ static int
>>> +db8500_sys_get_trip_temp(struct thermal_zone_device *thermal,
>>> + int trip, unsigned long *temp)
>>> +{
>>> + struct db8500_thermal_zone *pzone = thermal->devdata;
>>> + struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
>>> +
>>> + if (trip >= ptrips->num_trips)
>>> + return -EINVAL;
>>> +
>>> + *temp = ptrips->trip_points[trip].temp;
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +/* Callback to get critical trip point temperature */ static int
>>> +db8500_sys_get_crit_temp(struct thermal_zone_device *thermal,
>>> + unsigned long *temp)
>>> +{
>>> + struct db8500_thermal_zone *pzone = thermal->devdata;
>>> + struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
>>> + int i;
>>> +
>>> + for (i = ptrips->num_trips - 1; i > 0; i--) {
>>> + if (ptrips->trip_points[i].type == THERMAL_TRIP_CRITICAL) {
>>> + *temp = ptrips->trip_points[i].temp;
>>> + return 0;
>>> + }
>>> + }
>>> +
>>> + return -EINVAL;
>>> +}
>>> +
>>> +static struct thermal_zone_device_ops thdev_ops = {
>>> + .bind = db8500_cdev_bind,
>>> + .unbind = db8500_cdev_unbind,
>>> + .get_temp = db8500_sys_get_temp,
>>> + .get_trend = db8500_sys_get_trend,
>>> + .get_mode = db8500_sys_get_mode,
>>> + .set_mode = db8500_sys_set_mode,
>>> + .get_trip_type = db8500_sys_get_trip_type,
>>> + .get_trip_temp = db8500_sys_get_trip_temp,
>>> + .get_crit_temp = db8500_sys_get_crit_temp, };
>>> +
>>> +static void db8500_thermal_update_config(struct db8500_thermal_zone
>>> *pzone,
>>> + unsigned int idx, enum thermal_trend trend,
>>> + unsigned long next_low, unsigned long next_high) {
>>> + pzone->cur_index = idx;
>>> + pzone->cur_temp_pseudo = (next_low + next_high)/2;
>>> + pzone->trend = trend;
>>> +
>>> + prcmu_stop_temp_sense();
>>> + prcmu_config_hotmon((u8)(next_low/1000), (u8)(next_high/1000));
>>> + prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
>>> +}
>>> +
>>> +static irqreturn_t prcmu_low_irq_handler(int irq, void *irq_data) {
>>> + struct db8500_thermal_zone *pzone = irq_data;
>>> + struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
>>> + unsigned int idx = pzone->cur_index;
>>> + unsigned long next_low, next_high;
>>> +
>>> + if (unlikely(idx == 0))
>>> + /* Meaningless for thermal management, ignoring it */
>>> + return IRQ_HANDLED;
>>> +
>>> + if (idx == 1) {
>>> + next_high = ptrips->trip_points[0].temp;
>>> + next_low = PRCMU_DEFAULT_LOW_TEMP;
>>> + } else {
>>> + next_high = ptrips->trip_points[idx-1].temp;
>>> + next_low = ptrips->trip_points[idx-2].temp;
>>> + }
>>> + idx -= 1;
>>> +
>>> + db8500_thermal_update_config(pzone, idx, THERMAL_TREND_DROPPING,
>>> + next_low, next_high);
>>> +
>>> + dev_dbg(&pzone->therm_dev->device,
>>> + "PRCMU set max %ld, min %ld\n", next_high, next_low);
>>> +
>>> + schedule_work(&pzone->therm_work);
>>> +
>>> + return IRQ_HANDLED;
>>> +}
>>> +
>>> +static irqreturn_t prcmu_high_irq_handler(int irq, void *irq_data) {
>>> + struct db8500_thermal_zone *pzone = irq_data;
>>> + struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
>>> + unsigned int idx = pzone->cur_index;
>>> + unsigned long next_low, next_high;
>>> +
>>> + if (idx < ptrips->num_trips - 1) {
>>> + next_high = ptrips->trip_points[idx+1].temp;
>>> + next_low = ptrips->trip_points[idx].temp;
>>> + idx += 1;
>>> +
>>> + db8500_thermal_update_config(pzone, idx,
>>> THERMAL_TREND_RAISING,
>>> + next_low, next_high);
>>> +
>>> + dev_dbg(&pzone->therm_dev->device,
>>> + "PRCMU set max %ld, min %ld\n", next_high, next_low);
>>> + } else if (idx == ptrips->num_trips - 1)
>>> + pzone->cur_temp_pseudo = ptrips->trip_points[idx].temp + 1;
>>> +
>>> + schedule_work(&pzone->therm_work);
>>> +
>>> + return IRQ_HANDLED;
>>> +}
>>> +
>>> +static void db8500_thermal_work(struct work_struct *work) {
>>> + enum thermal_device_mode cur_mode;
>>> + struct db8500_thermal_zone *pzone;
>>> +
>>> + pzone = container_of(work, struct db8500_thermal_zone,
>>> therm_work);
>>> +
>>> + mutex_lock(&pzone->th_lock);
>>> + cur_mode = pzone->mode;
>>> + mutex_unlock(&pzone->th_lock);
>>> +
>>> + if (cur_mode == THERMAL_DEVICE_DISABLED)
>>> + return;
>>> +
>>> + thermal_zone_device_update(pzone->therm_dev);
>>> + dev_dbg(&pzone->therm_dev->device, "thermal work finished.\n"); }
>>> +
>>> +#ifdef CONFIG_OF
>>> +static struct db8500_thsens_platform_data*
>>> + db8500_thermal_parse_dt(struct platform_device *pdev) {
>>> + struct db8500_thsens_platform_data *ptrips;
>>> + struct device_node *np = pdev->dev.of_node;
>>> + char prop_name[32];
>>> + const char *tmp_str;
>>> + u32 tmp_data;
>>> + int i, j;
>>> +
>>> + ptrips = devm_kzalloc(&pdev->dev, sizeof(*ptrips), GFP_KERNEL);
>>> + if (!ptrips)
>>> + return NULL;
>>> +
>>> + if (of_property_read_u32(np, "num-trips", &tmp_data))
>>> + goto err_parse_dt;
>>> +
>>> + if (tmp_data > THERMAL_MAX_TRIPS)
>>> + goto err_parse_dt;
>>> +
>>> + ptrips->num_trips = tmp_data;
>>> +
>>> + for (i = 0; i < ptrips->num_trips; i++) {
>>> + sprintf(prop_name, "trip%d-temp", i);
>>> + if (of_property_read_u32(np, prop_name, &tmp_data))
>>> + goto err_parse_dt;
>>> +
>>> + ptrips->trip_points[i].temp = tmp_data;
>>> +
>>> + sprintf(prop_name, "trip%d-type", i);
>>> + if (of_property_read_string(np, prop_name, &tmp_str))
>>> + goto err_parse_dt;
>>> +
>>> + if (!strcmp(tmp_str, "active"))
>>> + ptrips->trip_points[i].type = THERMAL_TRIP_ACTIVE;
>>> + else if (!strcmp(tmp_str, "passive"))
>>> + ptrips->trip_points[i].type = THERMAL_TRIP_PASSIVE;
>>> + else if (!strcmp(tmp_str, "hot"))
>>> + ptrips->trip_points[i].type = THERMAL_TRIP_HOT;
>>> + else if (!strcmp(tmp_str, "critical"))
>>> + ptrips->trip_points[i].type = THERMAL_TRIP_CRITICAL;
>>> + else
>>> + goto err_parse_dt;
>>> +
>>> + sprintf(prop_name, "trip%d-cdev-num", i);
>>> + if (of_property_read_u32(np, prop_name, &tmp_data))
>>> + goto err_parse_dt;
>>> +
>>> + if (tmp_data > COOLING_DEV_MAX)
>>> + goto err_parse_dt;
>>> +
>>> + for (j = 0; j < tmp_data; j++) {
>>> + sprintf(prop_name, "trip%d-cdev-name%d", i, j);
>>> + if (of_property_read_string(np, prop_name, &tmp_str))
>>> + goto err_parse_dt;
>>> +
>>> + if (strlen(tmp_str) > THERMAL_NAME_LENGTH)
>>> + goto err_parse_dt;
>>> +
>>> + strcpy(ptrips->trip_points[i].cdev_name[j], tmp_str);
>>> + }
>>> + }
>>> + return ptrips;
>>> +
>>> +err_parse_dt:
>>> + dev_err(&pdev->dev, "Parsing device tree data error.\n");
>>> + return NULL;
>>> +}
>>> +#else
>>> +static inline struct db8500_thsens_platform_data*
>>> + db8500_thermal_parse_dt(struct platform_device *pdev) {
>>> + return NULL;
>>> +}
>>> +#endif
>>> +
>>> +static int db8500_thermal_probe(struct platform_device *pdev) {
>>> + struct db8500_thermal_zone *pzone = NULL;
>>> + struct db8500_thsens_platform_data *ptrips = NULL;
>>> + struct device_node *np = pdev->dev.of_node;
>>> + int low_irq, high_irq, ret = 0;
>>> + unsigned long dft_low, dft_high;
>>> +
>>> + if (np)
>>> + ptrips = db8500_thermal_parse_dt(pdev);
>>> + else
>>> + ptrips = dev_get_platdata(&pdev->dev);
>>> +
>>> + if (!ptrips)
>>> + return -EINVAL;
>>> +
>>> + pzone = devm_kzalloc(&pdev->dev, sizeof(*pzone), GFP_KERNEL);
>>> + if (!pzone)
>>> + return -ENOMEM;
>>> +
>>> + mutex_init(&pzone->th_lock);
>>> + mutex_lock(&pzone->th_lock);
>>> +
>>> + pzone->mode = THERMAL_DEVICE_DISABLED;
>>> + pzone->trip_tab = ptrips;
>>> +
>>> + dft_low = PRCMU_DEFAULT_LOW_TEMP;
>>> + dft_high = ptrips->trip_points[0].temp;
>>> +
>>> + db8500_thermal_update_config(pzone, 0, THERMAL_TREND_STABLE,
>>> + dft_low, dft_high);
>>> +
>>> + INIT_WORK(&pzone->therm_work, db8500_thermal_work);
>>> +
>>> + low_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_LOW");
>>> + if (low_irq < 0) {
>>> + dev_err(&pdev->dev, "Get IRQ_HOTMON_LOW failed.\n");
>>> + return low_irq;
>>> + }
>>> +
>>> + ret = devm_request_threaded_irq(&pdev->dev, low_irq, NULL,
>>> + prcmu_low_irq_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT,
>>> + "dbx500_temp_low", pzone);
>>> + if (ret < 0) {
>>> + dev_err(&pdev->dev, "Failed to allocate temp low irq.\n");
>>> + return ret;
>>> + }
>>> +
>>> + high_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_HIGH");
>>> + if (high_irq < 0) {
>>> + dev_err(&pdev->dev, "Get IRQ_HOTMON_HIGH failed.\n");
>>> + return high_irq;
>>> + }
>>> +
>>> + ret = devm_request_threaded_irq(&pdev->dev, high_irq, NULL,
>>> + prcmu_high_irq_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT,
>>> + "dbx500_temp_high", pzone);
>>> + if (ret < 0) {
>>> + dev_err(&pdev->dev, "Failed to allocate temp high irq.\n");
>>> + return ret;
>>> + }
>>> +
>>> + pzone->therm_dev =
>>> thermal_zone_device_register("db8500_thermal_zone",
>>> + ptrips->num_trips, 0, pzone, &thdev_ops, 0, 0);
>>> +
>>> + if (IS_ERR_OR_NULL(pzone->therm_dev)) {
>>> + dev_err(&pdev->dev, "Register thermal zone device
>>> failed.\n");
>>> + return PTR_ERR(pzone->therm_dev);
>>> + }
>>> + dev_info(&pdev->dev, "Thermal zone device registered.\n");
>>> +
>>> + platform_set_drvdata(pdev, pzone);
>>> + pzone->mode = THERMAL_DEVICE_ENABLED;
>>> + mutex_unlock(&pzone->th_lock);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int db8500_thermal_remove(struct platform_device *pdev) {
>>> + struct db8500_thermal_zone *pzone = platform_get_drvdata(pdev);
>>> +
>>> + thermal_zone_device_unregister(pzone->therm_dev);
>>> + cancel_work_sync(&pzone->therm_work);
>>> + mutex_destroy(&pzone->th_lock);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int db8500_thermal_suspend(struct platform_device *pdev,
>>> + pm_message_t state)
>>> +{
>>> + struct db8500_thermal_zone *pzone = platform_get_drvdata(pdev);
>>> +
>>> + flush_work_sync(&pzone->therm_work);
>>> + prcmu_stop_temp_sense();
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int db8500_thermal_resume(struct platform_device *pdev) {
>>> + struct db8500_thermal_zone *pzone = platform_get_drvdata(pdev);
>>> + struct db8500_thsens_platform_data *ptrips = pzone->trip_tab;
>>> + unsigned long dft_low, dft_high;
>>> +
>>> + dft_low = PRCMU_DEFAULT_LOW_TEMP;
>>> + dft_high = ptrips->trip_points[0].temp;
>>> +
>>> + db8500_thermal_update_config(pzone, 0, THERMAL_TREND_STABLE,
>>> + dft_low, dft_high);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +#ifdef CONFIG_OF
>>> +static const struct of_device_id db8500_thermal_match[] = {
>>> + { .compatible = "stericsson,db8500-thermal" },
>>> + {},
>>> +};
>>> +#else
>>> +#define db8500_thermal_match NULL
>>> +#endif
>>> +
>>> +static struct platform_driver db8500_thermal_driver = {
>>> + .driver = {
>>> + .owner = THIS_MODULE,
>>> + .name = "db8500-thermal",
>>> + .of_match_table = db8500_thermal_match,
>>> + },
>>> + .probe = db8500_thermal_probe,
>>> + .suspend = db8500_thermal_suspend,
>>> + .resume = db8500_thermal_resume,
>>> + .remove = db8500_thermal_remove,
>>> +};
>>> +
>>> +module_platform_driver(db8500_thermal_driver);
>>> +
>>> +MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@...ricsson.com>");
>>> +MODULE_DESCRIPTION("DB8500 thermal driver"); MODULE_LICENSE("GPL");
>>> diff --git a/include/linux/platform_data/db8500_thermal.h
>>> b/include/linux/platform_data/db8500_thermal.h
>>> new file mode 100644
>>> index 0000000..3bf6090
>>> --- /dev/null
>>> +++ b/include/linux/platform_data/db8500_thermal.h
>>> @@ -0,0 +1,38 @@
>>> +/*
>>> + * db8500_thermal.h - DB8500 Thermal Management Implementation
>>> + *
>>> + * Copyright (C) 2012 ST-Ericsson
>>> + * Copyright (C) 2012 Linaro Ltd.
>>> + *
>>> + * Author: Hongbo Zhang <hongbo.zhang@...aro.com>
>>> + *
>>> + * 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.
>>> + */
>>> +
>>> +#ifndef _DB8500_THERMAL_H_
>>> +#define _DB8500_THERMAL_H_
>>> +
>>> +#include <linux/thermal.h>
>>> +
>>> +#define COOLING_DEV_MAX 8
>>> +
>>> +struct db8500_trip_point {
>>> + unsigned long temp;
>>> + enum thermal_trip_type type;
>>> + char cdev_name[COOLING_DEV_MAX][THERMAL_NAME_LENGTH];
>>> +};
>>> +
>>> +struct db8500_thsens_platform_data {
>>> + struct db8500_trip_point trip_points[THERMAL_MAX_TRIPS];
>>> + int num_trips;
>>> +};
>>> +
>>> +#endif /* _DB8500_THERMAL_H_ */
>>> --
>>> 1.7.11.3
>>
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