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Date: Fri, 9 Jan 2015 07:46:01 -0400
From: Eduardo Valentin <edubezval@...il.com>
To: Nishanth Menon <nm@...com>
Cc: Guenter Roeck <linux@...ck-us.net>,
Jean Delvare <jdelvare@...e.de>, lm-sensors@...sensors.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
linux-pm@...r.kernel.org
Subject: Re: [PATCH V2] (gpio-fan): Add thermal control hooks
On Thu, Jan 08, 2015 at 12:05:03PM -0600, Nishanth Menon wrote:
> Allow gpio-fan to be used as thermal cooling device for platforms that
> use GPIO maps to control fans.
>
> As part of this change, we make the shutdown and remove logic the same
> as well.
>
> Signed-off-by: Nishanth Menon <nm@...com>
For the thermal part:
Acked-by: Eduardo Valentin <edubezval@...il.com>
> ---
>
> Changes since v1:
> - review comments incorporated (hopefully correct)
> - checkpatch verified
> - retested :).
>
> V1: https://patchwork.kernel.org/patch/5587061/
>
> .../devicetree/bindings/gpio/gpio-fan.txt | 13 +++
> drivers/hwmon/gpio-fan.c | 83 ++++++++++++++++++--
> 2 files changed, 89 insertions(+), 7 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-fan.txt b/Documentation/devicetree/bindings/gpio/gpio-fan.txt
> index 2dd457a3469a..43ca2a45b862 100644
> --- a/Documentation/devicetree/bindings/gpio/gpio-fan.txt
> +++ b/Documentation/devicetree/bindings/gpio/gpio-fan.txt
> @@ -11,6 +11,9 @@ Required properties:
> Optional properties:
> - alarm-gpios: This pin going active indicates something is wrong with
> the fan, and a udev event will be fired.
> +- cooling-cells: If used as a cooling device, must be <2>
> + Also see: Documentation/devicetree/bindings/thermal/thermal.txt
> + min and max states are derived from the speed-map of the fan.
>
> Examples:
>
> @@ -23,3 +26,13 @@ Examples:
> 6000 2>;
> alarm-gpios = <&gpio1 15 1>;
> };
> + gpio_fan_cool: gpio_fan {
> + compatible = "gpio-fan";
> + gpios = <&gpio2 14 1
> + &gpio2 13 1>;
> + gpio-fan,speed-map = <0 0>,
> + <3000 1>,
> + <6000 2>;
> + alarm-gpios = <&gpio2 15 1>;
> + #cooling-cells = <2>; /* min followed by max */
> + };
> diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c
> index 36abf814b8c7..20232c11b579 100644
> --- a/drivers/hwmon/gpio-fan.c
> +++ b/drivers/hwmon/gpio-fan.c
> @@ -34,10 +34,13 @@
> #include <linux/of.h>
> #include <linux/of_platform.h>
> #include <linux/of_gpio.h>
> +#include <linux/thermal.h>
>
> struct gpio_fan_data {
> struct platform_device *pdev;
> struct device *hwmon_dev;
> + /* Cooling device if any */
> + struct thermal_cooling_device *cdev;
> struct mutex lock; /* lock GPIOs operations. */
> int num_ctrl;
> unsigned *ctrl;
> @@ -387,6 +390,53 @@ static int fan_ctrl_init(struct gpio_fan_data *fan_data,
> return 0;
> }
>
> +static int gpio_fan_get_max_state(struct thermal_cooling_device *cdev,
> + unsigned long *state)
> +{
> + struct gpio_fan_data *fan_data = cdev->devdata;
> +
> + if (!fan_data)
> + return -EINVAL;
> +
> + *state = fan_data->num_speed - 1;
> + return 0;
> +}
> +
> +static int gpio_fan_get_cur_state(struct thermal_cooling_device *cdev,
> + unsigned long *state)
> +{
> + struct gpio_fan_data *fan_data = cdev->devdata;
> + int r;
> +
> + if (!fan_data)
> + return -EINVAL;
> +
> + r = get_fan_speed_index(fan_data);
> + if (r < 0)
> + return r;
> +
> + *state = r;
> + return 0;
> +}
> +
> +static int gpio_fan_set_cur_state(struct thermal_cooling_device *cdev,
> + unsigned long state)
> +{
> + struct gpio_fan_data *fan_data = cdev->devdata;
> +
> + if (!fan_data)
> + return -EINVAL;
> +
> + set_fan_speed(fan_data, state);
> + return 0;
> +}
> +
> +static const struct thermal_cooling_device_ops gpio_fan_cool_ops = {
> + .get_max_state = gpio_fan_get_max_state,
> + .get_cur_state = gpio_fan_get_cur_state,
> + .set_cur_state = gpio_fan_set_cur_state,
> +};
> +
> #ifdef CONFIG_OF_GPIO
> /*
> * Translate OpenFirmware node properties into platform_data
> @@ -495,6 +545,11 @@ static int gpio_fan_probe(struct platform_device *pdev)
> struct gpio_fan_data *fan_data;
> struct gpio_fan_platform_data *pdata = dev_get_platdata(&pdev->dev);
>
> + fan_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_fan_data),
> + GFP_KERNEL);
> + if (!fan_data)
> + return -ENOMEM;
> +
> #ifdef CONFIG_OF_GPIO
> if (!pdata) {
> pdata = devm_kzalloc(&pdev->dev,
> @@ -506,17 +561,20 @@ static int gpio_fan_probe(struct platform_device *pdev)
> err = gpio_fan_get_of_pdata(&pdev->dev, pdata);
> if (err)
> return err;
> + /* Optional cooling device register for Device tree platforms */
> + fan_data->cdev =
> + thermal_of_cooling_device_register(pdev->dev.of_node,
> + "gpio-fan", fan_data,
> + &gpio_fan_cool_ops);
> }
> #else /* CONFIG_OF_GPIO */
> if (!pdata)
> return -EINVAL;
> + /* Optional cooling device register for non Device tree platforms */
> + fan_data->cdev = thermal_cooling_device_register("gpio-fan", fan_data,
> + &gpio_fan_cool_ops);
> #endif /* CONFIG_OF_GPIO */
>
> - fan_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_fan_data),
> - GFP_KERNEL);
> - if (!fan_data)
> - return -ENOMEM;
> -
> fan_data->pdev = pdev;
> platform_set_drvdata(pdev, fan_data);
> mutex_init(&fan_data->lock);
> @@ -550,12 +608,22 @@ static int gpio_fan_probe(struct platform_device *pdev)
> return 0;
> }
>
> -static void gpio_fan_shutdown(struct platform_device *pdev)
> +static int gpio_fan_remove(struct platform_device *pdev)
> {
> - struct gpio_fan_data *fan_data = dev_get_drvdata(&pdev->dev);
> + struct gpio_fan_data *fan_data = platform_get_drvdata(pdev);
> +
> + if (!IS_ERR(fan_data->cdev))
> + thermal_cooling_device_unregister(fan_data->cdev);
>
> if (fan_data->ctrl)
> set_fan_speed(fan_data, 0);
> +
> + return 0;
> +}
> +
> +static void gpio_fan_shutdown(struct platform_device *pdev)
> +{
> + gpio_fan_remove(pdev);
> }
>
> #ifdef CONFIG_PM_SLEEP
> @@ -589,6 +657,7 @@ static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume);
>
> static struct platform_driver gpio_fan_driver = {
> .probe = gpio_fan_probe,
> + .remove = gpio_fan_remove,
> .shutdown = gpio_fan_shutdown,
> .driver = {
> .name = "gpio-fan",
> --
> 1.7.9.5
>
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