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Date: Thu, 2 Jun 2011 11:48:30 +0200
From: Corentin Chary <corentin.chary@...il.com>
To: Ike Panhc <ike.pan@...onical.com>
Cc: platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org, Matthew Garrett <mjg@...hat.com>,
Randy Dunlap <rdunlap@...otime.net>
Subject: Re: [PATCH 2/3] ideapad: Add nodes in sysfs
On Thu, Jun 2, 2011 at 11:24 AM, Ike Panhc <ike.pan@...onical.com> wrote:
> Create the following nodes in sysfs
> /sys/devices/platform/ideapad/brightness
> /sys/devices/platform/ideapad/touchpad
> /sys/devices/platform/ideapad/cfg
> /sys/devices/platform/ideapad/backlight
>
> Signed-off-by: Ike Panhc <ike.pan@...onical.com>
> ---
> .../ABI/testing/sysfs-platform-ideapad-laptop | 30 +++++
> drivers/platform/x86/ideapad-laptop.c | 128 +++++++++++++++++---
> 2 files changed, 140 insertions(+), 18 deletions(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-platform-ideapad-laptop b/Documentation/ABI/testing/sysfs-platform-ideapad-laptop
> index 807fca2..869f0c4 100644
> --- a/Documentation/ABI/testing/sysfs-platform-ideapad-laptop
> +++ b/Documentation/ABI/testing/sysfs-platform-ideapad-laptop
> @@ -4,3 +4,33 @@ KernelVersion: 2.6.37
> Contact: "Ike Panhc <ike.pan@...onical.com>"
> Description:
> Control the power of camera module. 1 means on, 0 means off.
> +
> +What: /sys/devices/platform/ideapad/brightness
> +Date: Jun 2011
> +KernelVersion: 3.0.1
> +Contact: "Ike Panhc <ike.pan@...onical.com>"
> +Description:
> + Brightness control. When reading, it shows <current>/<max>.
> + When writing, it accepts new brightness value.
> +
> +What: /sys/devices/platform/ideapad/touchpad
> +Date: Jun 2011
> +KernelVersion: 3.0.1
> +Contact: "Ike Panhc <ike.pan@...onical.com>"
> +Description:
> + Control the power of touchpad. 1 means on, 0 means off.
> +
> +What: /sys/devices/platform/ideapad/cfg
> +Date: Jun 2011
> +KernelVersion: 3.0.1
> +Contact: "Ike Panhc <ike.pan@...onical.com>"
> +Description:
> + Ideapad capability bits.
> +
> +What: /sys/devices/platform/ideapad/backlight
> +Date: Jun 2011
> +KernelVersion: 3.0.1
> +Contact: "Ike Panhc <ike.pan@...onical.com>"
> +Description:
> + Control the power of backlight. 1 means on, 0 means off.
> +
> diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
> index a5c0efa..9c09891 100644
> --- a/drivers/platform/x86/ideapad-laptop.c
> +++ b/drivers/platform/x86/ideapad-laptop.c
> @@ -160,22 +160,25 @@ static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
> }
>
> /*
> - * camera power
> + * sysfs helper
> */
> -static ssize_t show_ideapad_cam(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> +static ssize_t show_ideapad_helper(struct device *dev,
> + struct device_attribute *attr,
> + char *buf,
> + int cmd)
> {
> unsigned long result;
>
> - if (read_ec_data(ideapad_handle, 0x1D, &result))
> + if (read_ec_data(ideapad_handle, cmd, &result))
> return sprintf(buf, "-1\n");
> return sprintf(buf, "%lu\n", result);
> }
>
> -static ssize_t store_ideapad_cam(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf, size_t count)
> +static ssize_t store_ideapad_helper(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf,
> + size_t count,
> + int cmd)
> {
> int ret, state;
>
> @@ -183,14 +186,112 @@ static ssize_t store_ideapad_cam(struct device *dev,
> return 0;
> if (sscanf(buf, "%i", &state) != 1)
> return -EINVAL;
> - ret = write_ec_cmd(ideapad_handle, 0x1E, state);
> + ret = write_ec_cmd(ideapad_handle, cmd, state);
> if (ret < 0)
> return ret;
> return count;
> }
>
> +/*
> + * sysfs node
> + */
> +static ssize_t show_ideapad_cam(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + return show_ideapad_helper(dev, attr, buf, 0x1D);
> +}
> +
> +static ssize_t store_ideapad_cam(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + return store_ideapad_helper(dev, attr, buf, count, 0x1E);
> +}
> +
> static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
>
> +static ssize_t show_ideapad_touchpad(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + return show_ideapad_helper(dev, attr, buf, 0x1B);
> +}
> +
> +static ssize_t store_ideapad_touchpad(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + return store_ideapad_helper(dev, attr, buf, count, 0x1C);
> +}
> +
> +static DEVICE_ATTR(touchpad, 0644, show_ideapad_touchpad,
> + store_ideapad_touchpad);
> +
> +static ssize_t show_ideapad_brightness(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + unsigned long now, max;
> +
> + if (read_ec_data(ideapad_handle, 0x11, &max))
> + max = -1;
> + if (read_ec_data(ideapad_handle, 0x12, &now))
> + now = -1;
> + return sprintf(buf, "%lu/%lu\n", now, max);
> +}
> +
> +static ssize_t store_ideapad_brightness(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + return store_ideapad_helper(dev, attr, buf, count, 0x13);
> +}
> +
> +static DEVICE_ATTR(brightness, 0644, show_ideapad_brightness,
> + store_ideapad_brightness);
> +
> +static ssize_t show_ideapad_cfg(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct ideapad_private *priv = dev_get_drvdata(dev);
> +
> + return sprintf(buf, "0x%.8X\n", (unsigned int)(priv->cfg));
> +}
> +
> +static DEVICE_ATTR(cfg, 0444, show_ideapad_cfg, NULL);
> +
> +static ssize_t show_ideapad_backlight(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + return show_ideapad_helper(dev, attr, buf, 0x18);
> +}
> +
> +static ssize_t store_ideapad_backlight(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + return store_ideapad_helper(dev, attr, buf, count, 0x33);
> +}
> +
> +static DEVICE_ATTR(backlight, 0644, show_ideapad_backlight,
> + store_ideapad_backlight);
> +
> +static struct attribute *ideapad_attributes[] = {
> + &dev_attr_camera_power.attr,
> + &dev_attr_brightness.attr,
> + &dev_attr_touchpad.attr,
> + &dev_attr_cfg.attr,
> + &dev_attr_backlight.attr,
> + NULL
> +};
> +
> +static struct attribute_group ideapad_attribute_group = {
> + .attrs = ideapad_attributes
> +};
> +
> /*
> * Rfkill
> */
> @@ -285,15 +386,6 @@ static void __devexit ideapad_unregister_rfkill(struct acpi_device *adevice,
> /*
> * Platform device
> */
> -static struct attribute *ideapad_attributes[] = {
> - &dev_attr_camera_power.attr,
> - NULL
> -};
> -
> -static struct attribute_group ideapad_attribute_group = {
> - .attrs = ideapad_attributes
> -};
> -
> static int __devinit ideapad_platform_init(struct ideapad_private *priv)
> {
> int result;
> --
> 1.7.4.1
>
> --
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>
Hi Ike,
Why do you want to add /sys/devices/platform/ideapad/brightness and
/sys/devices/platform/ideapad/backlight ?
Both of these files should be handled by the generic backlight class
(using brightness and bl_power).
Also, could you describe what are these "capabilities" in the sysfs doc file ?
Thanks
--
Corentin Chary
http://xf.iksaif.net
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