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Date: Mon, 04 Feb 2013 10:14:26 +0800
From: Zhang Rui <rui.zhang@...el.com>
To: Amit Daniel Kachhap <amit.daniel@...sung.com>
Cc: linux-pm@...r.kernel.org, jonghwa3.lee@...sung.com,
linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
durgadoss.r@...el.com
Subject: Re: [PATCH V2 2/2] thermal: exynos: Use the framework for
temperature emulation support
On Sun, 2013-01-27 at 19:28 -0800, Amit Daniel Kachhap wrote:
> This removes the driver specific sysfs support of the temperature
> emulation and uses the newly added core thermal framework for thermal
> emulation. A platform specific handler is added to support this.
>
> Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
> Acked-by: Kukjin Kim <kgene.kim@...sung.com>
> ---
> Changes in V2:
> * Added config option CONFIG_THERMAL_EMULATION instead of
> CONFIG_EXYNOS_THERMAL_EMUL
>
> This patchset is based on thermal maintainer next tree.
> git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux.git next
>
> Documentation/thermal/exynos_thermal_emulation | 8 +-
> drivers/thermal/Kconfig | 9 --
> drivers/thermal/exynos_thermal.c | 158 ++++++++++--------------
> 3 files changed, 67 insertions(+), 108 deletions(-)
>
> diff --git a/Documentation/thermal/exynos_thermal_emulation b/Documentation/thermal/exynos_thermal_emulation
> index b73bbfb..36a3e79 100644
> --- a/Documentation/thermal/exynos_thermal_emulation
> +++ b/Documentation/thermal/exynos_thermal_emulation
> @@ -13,11 +13,11 @@ Thermal emulation mode supports software debug for TMU's operation. User can set
> manually with software code and TMU will read current temperature from user value not from
> sensor's value.
>
> -Enabling CONFIG_EXYNOS_THERMAL_EMUL option will make this support in available.
> -When it's enabled, sysfs node will be created under
> -/sys/bus/platform/devices/'exynos device name'/ with name of 'emulation'.
> +Enabling CONFIG_THERMAL_EMULATION option will make this support available.
> +When it's enabled, sysfs node will be created as
> +/sys/devices/virtual/thermal/thermal_zone'zone id'/emul_temp.
>
> -The sysfs node, 'emulation', will contain value 0 for the initial state. When you input any
> +The sysfs node, 'emul_node', will contain value 0 for the initial state. When you input any
> temperature you want to update to sysfs node, it automatically enable emulation mode and
> current temperature will be changed into it.
> (Exynos also supports user changable delay time which would be used to delay of
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index e4cf7fb..2a79510 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -109,15 +109,6 @@ config EXYNOS_THERMAL
> If you say yes here you get support for TMU (Thermal Management
> Unit) on SAMSUNG EXYNOS series of SoC.
>
> -config EXYNOS_THERMAL_EMUL
> - bool "EXYNOS TMU emulation mode support"
> - depends on EXYNOS_THERMAL
> - help
> - Exynos 4412 and 4414 and 5 series has emulation mode on TMU.
> - Enable this option will be make sysfs node in exynos thermal platform
> - device directory to support emulation mode. With emulation mode sysfs
> - node, you can manually input temperature to TMU for simulation purpose.
> -
> config DB8500_THERMAL
> bool "DB8500 thermal management"
> depends on ARCH_U8500
> diff --git a/drivers/thermal/exynos_thermal.c b/drivers/thermal/exynos_thermal.c
> index 327102a..afe9c2a 100644
> --- a/drivers/thermal/exynos_thermal.c
> +++ b/drivers/thermal/exynos_thermal.c
> @@ -99,13 +99,13 @@
> #define IDLE_INTERVAL 10000
> #define MCELSIUS 1000
>
> -#ifdef CONFIG_EXYNOS_THERMAL_EMUL
> +#ifdef CONFIG_THERMAL_EMULATION
> #define EXYNOS_EMUL_TIME 0x57F0
> #define EXYNOS_EMUL_TIME_SHIFT 16
> #define EXYNOS_EMUL_DATA_SHIFT 8
> #define EXYNOS_EMUL_DATA_MASK 0xFF
> #define EXYNOS_EMUL_ENABLE 0x1
> -#endif /* CONFIG_EXYNOS_THERMAL_EMUL */
> +#endif /* CONFIG_THERMAL_EMULATION */
>
> /* CPU Zone information */
> #define PANIC_ZONE 4
> @@ -143,6 +143,7 @@ struct thermal_cooling_conf {
> struct thermal_sensor_conf {
> char name[SENSOR_NAME_LEN];
> int (*read_temperature)(void *data);
> + int (*write_emul_temp)(void *data, unsigned long temp);
> struct thermal_trip_point_conf trip_data;
> struct thermal_cooling_conf cooling_data;
> void *private_data;
> @@ -366,6 +367,23 @@ static int exynos_get_temp(struct thermal_zone_device *thermal,
> return 0;
> }
>
> +/* Get temperature callback functions for thermal zone */
> +static int exynos_set_emul_temp(struct thermal_zone_device *thermal,
> + unsigned long temp)
> +{
> + void *data;
> + int ret = -EINVAL;
> +
> + if (!th_zone->sensor_conf) {
> + pr_info("Temperature sensor not initialised\n");
> + return -EINVAL;
> + }
> + data = th_zone->sensor_conf->private_data;
> + if (th_zone->sensor_conf->write_emul_temp)
> + ret = th_zone->sensor_conf->write_emul_temp(data, temp);
> + return ret;
> +}
> +
> /* Get the temperature trend */
> static int exynos_get_trend(struct thermal_zone_device *thermal,
> int trip, enum thermal_trend *trend)
> @@ -382,6 +400,7 @@ static struct thermal_zone_device_ops const exynos_dev_ops = {
> .bind = exynos_bind,
> .unbind = exynos_unbind,
> .get_temp = exynos_get_temp,
> + .set_emul_temp = exynos_set_emul_temp,
> .get_trend = exynos_get_trend,
> .get_mode = exynos_get_mode,
> .set_mode = exynos_set_mode,
> @@ -700,6 +719,44 @@ static int exynos_tmu_read(struct exynos_tmu_data *data)
> return temp;
> }
>
> +#ifdef CONFIG_THERMAL_EMULATION
> +static int exynos_tmu_set_emulation(struct exynos_tmu_data *data,
> + unsigned long temp)
> +{
> + unsigned int reg;
> + int ret = -EINVAL;
> +
> + if (data->soc == SOC_ARCH_EXYNOS4210)
> + goto out;
> +
> + if (temp && temp < MCELSIUS)
> + goto out;
> +
> + mutex_lock(&data->lock);
> + clk_enable(data->clk);
> +
> + reg = readl(data->base + EXYNOS_EMUL_CON);
> +
> + if (temp) {
> + temp /= MCELSIUS;
> +
> + reg = (EXYNOS_EMUL_TIME << EXYNOS_EMUL_TIME_SHIFT) |
> + (temp_to_code(data, temp)
> + << EXYNOS_EMUL_DATA_SHIFT) | EXYNOS_EMUL_ENABLE;
> + } else {
> + reg &= ~EXYNOS_EMUL_ENABLE;
> + }
> +
> + writel(reg, data->base + EXYNOS_EMUL_CON);
> +
> + clk_disable(data->clk);
> + mutex_unlock(&data->lock);
> + return 0;
> +out:
> + return ret;
> +}
> +#endif/*CONFIG_THERMAL_EMULATION*/
> +
> static void exynos_tmu_work(struct work_struct *work)
> {
> struct exynos_tmu_data *data = container_of(work,
> @@ -839,93 +896,6 @@ static inline struct exynos_tmu_platform_data *exynos_get_driver_data(
> platform_get_device_id(pdev)->driver_data;
> }
>
> -#ifdef CONFIG_EXYNOS_THERMAL_EMUL
> -static ssize_t exynos_tmu_emulation_show(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> -{
> - struct platform_device *pdev = container_of(dev,
> - struct platform_device, dev);
> - struct exynos_tmu_data *data = platform_get_drvdata(pdev);
> - unsigned int reg;
> - u8 temp_code;
> - int temp = 0;
> -
> - if (data->soc == SOC_ARCH_EXYNOS4210)
> - goto out;
> -
> - mutex_lock(&data->lock);
> - clk_enable(data->clk);
> - reg = readl(data->base + EXYNOS_EMUL_CON);
> - clk_disable(data->clk);
> - mutex_unlock(&data->lock);
> -
> - if (reg & EXYNOS_EMUL_ENABLE) {
> - reg >>= EXYNOS_EMUL_DATA_SHIFT;
> - temp_code = reg & EXYNOS_EMUL_DATA_MASK;
> - temp = code_to_temp(data, temp_code);
> - }
> -out:
> - return sprintf(buf, "%d\n", temp * MCELSIUS);
> -}
> -
> -static ssize_t exynos_tmu_emulation_store(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf, size_t count)
> -{
> - struct platform_device *pdev = container_of(dev,
> - struct platform_device, dev);
> - struct exynos_tmu_data *data = platform_get_drvdata(pdev);
> - unsigned int reg;
> - int temp;
> -
> - if (data->soc == SOC_ARCH_EXYNOS4210)
> - goto out;
> -
> - if (!sscanf(buf, "%d\n", &temp) || temp < 0)
> - return -EINVAL;
> -
> - mutex_lock(&data->lock);
> - clk_enable(data->clk);
> -
> - reg = readl(data->base + EXYNOS_EMUL_CON);
> -
> - if (temp) {
> - /* Both CELSIUS and MCELSIUS type are available for input */
> - if (temp > MCELSIUS)
> - temp /= MCELSIUS;
> -
> - reg = (EXYNOS_EMUL_TIME << EXYNOS_EMUL_TIME_SHIFT) |
> - (temp_to_code(data, (temp / MCELSIUS))
> - << EXYNOS_EMUL_DATA_SHIFT) | EXYNOS_EMUL_ENABLE;
> - } else {
> - reg &= ~EXYNOS_EMUL_ENABLE;
> - }
> -
> - writel(reg, data->base + EXYNOS_EMUL_CON);
> -
> - clk_disable(data->clk);
> - mutex_unlock(&data->lock);
> -
> -out:
> - return count;
> -}
> -
> -static DEVICE_ATTR(emulation, 0644, exynos_tmu_emulation_show,
> - exynos_tmu_emulation_store);
> -static int create_emulation_sysfs(struct device *dev)
> -{
> - return device_create_file(dev, &dev_attr_emulation);
> -}
> -static void remove_emulation_sysfs(struct device *dev)
> -{
> - device_remove_file(dev, &dev_attr_emulation);
> -}
> -#else
> -static inline int create_emulation_sysfs(struct device *dev) { return 0; }
> -static inline void remove_emulation_sysfs(struct device *dev) {}
> -#endif
> -
> static int __devinit exynos_tmu_probe(struct platform_device *pdev)
> {
> struct exynos_tmu_data *data;
> @@ -1002,6 +972,10 @@ static int __devinit exynos_tmu_probe(struct platform_device *pdev)
>
> /* Register the sensor with thermal management interface */
> (&exynos_sensor_conf)->private_data = data;
> +#ifdef CONFIG_THERMAL_EMULATION
> + (&exynos_sensor_conf)->write_emul_temp =
> + (int (*)(void *, unsigned long))exynos_tmu_set_emulation;
> +#endif
this is a little complicate.
to enable emulation, you just need
#ifdef CONFIG_THERMAL_EMUL
static int exynos_set_emul_temp(struct thermal_zone_device *thermal,
unsigned long temp)
{
remove exynos_tmu_set_emulation and copy its code here.
}
#else
static int exynos_set_emul_temp() { return -EINVAL; }
#endif
and
+ .set_emul_temp = exynos_set_emul_temp,
or do I miss something?
thanks,
rui
> exynos_sensor_conf.trip_data.trip_count = pdata->trigger_level0_en +
> pdata->trigger_level1_en + pdata->trigger_level2_en +
> pdata->trigger_level3_en;
> @@ -1025,10 +999,6 @@ static int __devinit exynos_tmu_probe(struct platform_device *pdev)
> goto err_clk;
> }
>
> - ret = create_emulation_sysfs(&pdev->dev);
> - if (ret)
> - dev_err(&pdev->dev, "Failed to create emulation mode sysfs node\n");
> -
> return 0;
> err_clk:
> platform_set_drvdata(pdev, NULL);
> @@ -1040,8 +1010,6 @@ static int __devexit exynos_tmu_remove(struct platform_device *pdev)
> {
> struct exynos_tmu_data *data = platform_get_drvdata(pdev);
>
> - remove_emulation_sysfs(&pdev->dev);
> -
> exynos_tmu_control(pdev, false);
>
> exynos_unregister_thermal();
--
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