Hi Hongbo,
On 10/16/2012 01:44 PM, hongbo.zhang wrote:
> From: "hongbo.zhang" <hongbo.zh...@linaro.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.
[...]
> diff --git a/drivers/thermal/db8500_cpufreq_cooling.c
> b/drivers/thermal/db8500_cpufreq_cooling.c
> new file mode 100644
> index 0000000..bb065d4
> --- /dev/null
> +++ b/drivers/thermal/db8500_cpufreq_cooling.c
> @@ -0,0 +1,118 @@
> +/*
> + * db8500_cpufreq_cooling.c - db8500 cpufreq works as cooling device.
> + *
> + * Copyright (C) 2012 ST-Ericsson
> + * Copyright (C) 2012 Linaro Ltd.
> + *
> + * Author: Hongbo Zhang <hognbo.zh...@stericsson.com>
Your e-mail address is misspelled :)
[...]
> diff --git a/drivers/thermal/db8500_thermal.c
> b/drivers/thermal/db8500_thermal.c
> new file mode 100644
> index 0000000..34dcc52
> --- /dev/null
> +++ b/drivers/thermal/db8500_thermal.c
> @@ -0,0 +1,507 @@
> +/*
> + * db8500_thermal.c - db8500 Thermal Management Implementation
> + *
> + * Copyright (C) 2012 ST-Ericsson
> + * Copyright (C) 2012 Linaro Ltd.
> + *
> + * Author: Hongbo Zhang <hognbo.zh...@stericsson.com>
Misspelled address
> + *
> + * 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/module.h>
> +#include <linux/slab.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/thermal.h>
> +#include <linux/cpu_cooling.h>
> +#include <linux/mfd/dbx500-prcmu.h>
> +#include <linux/platform_data/db8500_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 platform_device *thsens_pdev;
This member is set in db8500_thermal_probe(), but is never used. I would
suggest removing it.
> + 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;
> + int low_irq;
> + int high_irq;
Same story as thsens_pdev, low_irq and high_irq are set in
db8500_thermal_probe(), but are never used. Should be removed.
> +};
> +
> +/* 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;
> + struct db8500_thsens_platform_data *ptrips;
> + char *cdev_name;
> + unsigned long max_state, upper, lower;
> + int i, j, ret;
> +
> + pzone = (struct db8500_thermal_zone *)thermal->devdata;
> + ptrips = pzone->trip_tab;
> +
> + if (!cdev->type)
> + return -EINVAL;
cdev->type is an array, not a simple pointer, so it cannot be NULL.
> +
> + ret = -ENODEV;
> + for (i = 0; i < ptrips->num_trips; i++)
> + for (j = 0; j < COOLING_DEV_MAX; j++) {
> + cdev_name = ptrips->trip_points[i].cooling_dev_name[j];
> + if (!cdev_name)
> + continue;
> +
> + if (strcmp(cdev_name, cdev->type))
> + continue;
> +
> + cdev->ops->get_max_state(cdev, &max_state);
> + upper = (i > max_state) ? max_state : i;
> + lower = (i > max_state) ? max_state : i;
You may want to merge these two lines: upper = lower = ...
> +
> + ret = thermal_zone_bind_cooling_device(thermal, i,
> + cdev, upper, lower);
> + if (ret)
> + pr_err("Error binding cooling device.\n");
> + else
> + pr_info("Cdev %s bound.\n", cdev->type);
> + }
> +
> + 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;
> + struct db8500_thsens_platform_data *ptrips;
> + char *cdev_name;
> + int i, j, ret;
> +
> + pzone = (struct db8500_thermal_zone *)thermal->devdata;
> + ptrips = pzone->trip_tab;
> +
> + if (!cdev->type)
> + return -EINVAL;
cdev->type cannot be NULL.
> +
> + ret = -ENODEV;
> + for (i = 0; i < ptrips->num_trips; i++)
> + for (j = 0; j < COOLING_DEV_MAX; j++) {
> + cdev_name = ptrips->trip_points[i].cooling_dev_name[j];
> + if (!cdev_name)
> + continue;
> +
> + if (strcmp(cdev_name, cdev->type))
> + continue;
> +
> + ret = thermal_zone_unbind_cooling_device(
> + thermal, i, cdev);
> + if (ret)
> + pr_err("Error unbinding cooling device.\n");
> + else
> + pr_info("Cdev %s unbound.\n", cdev->type);
> + }
> +
> + 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;
> + pzone = (struct db8500_thermal_zone *)thermal->devdata;
> +
> + /* TODO: There is no PRCMU interface to get temperature data currently,
> + so a pseudo temperature is returned , it works for the 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;
> + pzone = (struct db8500_thermal_zone *)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;
> + pzone = (struct db8500_thermal_zone *)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;
> + struct thermal_zone_device *pthdev;
> +
> + pzone = (struct db8500_thermal_zone *)thermal->devdata;
> + pthdev = pzone->therm_dev;
> +
> + if (!pthdev) {
> + pr_err("Thermal zone not registered.\n");
> + return 0;
> + }
If this function is called, you are sure the thermal zone has been
registered.
> +
> + 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;
> + struct db8500_thsens_platform_data *ptrips;
> +
> + pzone = (struct db8500_thermal_zone *)thermal->devdata;
> + 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;
> + struct db8500_thsens_platform_data *ptrips;
> +
> + pzone = (struct db8500_thermal_zone *)thermal->devdata;
> + 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;
> + struct db8500_thsens_platform_data *ptrips;
> + int i;
> +
> + pzone = (struct db8500_thermal_zone *)thermal->devdata;
> + ptrips = pzone->trip_tab;
> +
> + 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 irqreturn_t prcmu_low_irq_handler(int irq, void *irq_data)
> +{
> + struct db8500_thermal_zone *pzone = irq_data;
> + struct db8500_thsens_platform_data *ptrips;
> + unsigned long next_low, next_high;
> + unsigned int idx;
> +
> + ptrips = pzone->trip_tab;
> + idx = pzone->cur_index;
> + 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;
> + }
> +
> + pzone->cur_index -= 1;
> + pzone->cur_temp_pseudo = (next_high + next_low)/2;
> +
> + prcmu_stop_temp_sense();
> + prcmu_config_hotmon((u8)(next_low/1000), (u8)(next_high/1000));
> + prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
> +
> + pr_debug("PRCMU set max %ld, set min %ld\n", next_high, next_low);
> +
> + pzone->trend = THERMAL_TREND_DROPPING;
> + 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;
> + unsigned long next_low, next_high;
> + unsigned int idx;
> +
> + ptrips = pzone->trip_tab;
> + idx = pzone->cur_index;
> +
> + if (idx < ptrips->num_trips - 1) {
> + next_high = ptrips->trip_points[idx+1].temp;
> + next_low = ptrips->trip_points[idx].temp;
> +
> + pzone->cur_index += 1;
> + pzone->cur_temp_pseudo = (next_high + next_low)/2;
> +
> + prcmu_stop_temp_sense();
> + prcmu_config_hotmon((u8)(next_low/1000), (u8)(next_high/1000));
> + prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
> +
> + pr_debug("PRCMU set max %ld, min %ld\n", next_high, next_low);
> + }
> +
> + if (idx == ptrips->num_trips - 1)
} else if ()
> + pzone->cur_temp_pseudo = ptrips->trip_points[idx].temp + 1;
> +
> + pzone->trend = THERMAL_TREND_RAISING;
> + 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) {
> + pr_warn("Warning: thermal function disabled.\n");
> + return;
> + }
> +
> + thermal_zone_device_update(pzone->therm_dev);
> + pr_debug("db8500_thermal_work finished.\n");
> +}
> +
> +static int __devinit db8500_thermal_probe(struct platform_device *pdev)
> +{
> + struct db8500_thermal_zone *pzone = NULL;
> + struct db8500_thsens_platform_data *ptrips;
> + int low_irq, high_irq, ret = 0;
> + unsigned long dft_low, dft_high;
> +
> + pzone = devm_kzalloc(&pdev->dev,
> + sizeof(struct db8500_thermal_zone), GFP_KERNEL);
> + if (!pzone)
> + return -ENOMEM;
> +
> + pzone->thsens_pdev = pdev;
> +
> + low_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_LOW");
> + if (low_irq < 0) {
> + pr_err("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) {
> + pr_err("Failed to allocate temp low irq.\n");
> + return ret;
> + }
> +
> + high_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_HIGH");
> + if (high_irq < 0) {
> + pr_err("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) {
> + pr_err("Failed to allocate temp high irq.\n");
> + return ret;
> + }
> +
> + pzone->low_irq = low_irq;
> + pzone->high_irq = high_irq;
> +
> + pzone->mode = THERMAL_DEVICE_DISABLED;
> +
> + mutex_init(&pzone->th_lock);
> +
> + INIT_WORK(&pzone->therm_work, db8500_thermal_work);
> +
> + ptrips = pdev->dev.platform_data;
> + pzone->trip_tab = ptrips;
> +
> + pzone->therm_dev = thermal_zone_device_register("db8500_thermal_zone",
> + ptrips->num_trips, 0, pzone, &thdev_ops, 0, 0);
> +
> + if (IS_ERR(pzone->therm_dev)) {
> + pr_err("Failed to register thermal zone device\n");
> + return PTR_ERR(pzone->therm_dev);
> + }
> +
> + dft_low = PRCMU_DEFAULT_LOW_TEMP;
> + dft_high = ptrips->trip_points[0].temp;
> +
> + prcmu_stop_temp_sense();
> + prcmu_config_hotmon((u8)(dft_low/1000), (u8)(dft_high/1000));
> + prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
> +
> + pzone->cur_index = 0;
> + pzone->cur_temp_pseudo = (dft_low + dft_high)/2;
> + pzone->trend = THERMAL_TREND_STABLE;
All the stuff from prcmu_stop_temp_sense() up to this line can race with
the irq handlers, I would suggest doing it before requesting the irqs.
> + pzone->mode = THERMAL_DEVICE_ENABLED;
Shouldn't this be protected by pzone->th_lock? Otherwise it should be
set before the thermal zone is registered.
> +
> + platform_set_drvdata(pdev, pzone);
> +
> + return 0;
> +}
> +
> +static int __devexit db8500_thermal_remove(struct platform_device *pdev)
> +{
> + struct db8500_thermal_zone *pzone;
> + pzone = platform_get_drvdata(pdev);
> +
> + cancel_work_sync(&pzone->therm_work);
> +
> + if (pzone->therm_dev)
> + thermal_zone_device_unregister(pzone->therm_dev);
> +
> + return 0;
> +}
mutex_destroy() should be called on pzone->th_lock
> +
> +static int db8500_thermal_suspend(struct platform_device *pdev,
> + pm_message_t state)
> +{
> + struct db8500_thermal_zone *pzone;
> + 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;
> + struct db8500_thsens_platform_data *ptrips;
> + unsigned long dft_low, dft_high;
> +
> + pzone = platform_get_drvdata(pdev);
> + ptrips = pzone->trip_tab;
> + dft_low = PRCMU_DEFAULT_LOW_TEMP;
> + dft_high = ptrips->trip_points[0].temp;
> +
> + prcmu_config_hotmon((u8)(dft_low/1000), (u8)(dft_high/1000));
> + prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
Shouldn't cur_index and cur_temp_pseudo be updated as well? You may want
to define a helper function with all the code shared by irq handlers
(both high and low), probe and resume.
> +
> + return 0;
> +}
[...]
> diff --git a/include/linux/platform_data/db8500_thermal.h
> b/include/linux/platform_data/db8500_thermal.h
> new file mode 100644
> index 0000000..0b6d164
> --- /dev/null
> +++ b/include/linux/platform_data/db8500_thermal.h
> @@ -0,0 +1,39 @@
> +/*
> + * db8500_thermal.h - db8500 Thermal Management Implementation
> + *
> + * Copyright (C) 2012 ST-Ericsson
> + * Copyright (C) 2012 Linaro Ltd.
> + *
> + * Author: Hongbo Zhang <hognbo.zh...@stericsson.com>
Misspelled address
--
Francesco
_______________________________________________
linaro-dev mailing list
linaro-dev@lists.linaro.org
http://lists.linaro.org/mailman/listinfo/linaro-dev
