2011-06-02 09:22:42

by Ike Panhc

[permalink] [raw]
Subject: [PATCH 1/3] ideapad: Use define for cfg bits

instead of hard code the number.

Signed-off-by: Ike Panhc <[email protected]>
---
drivers/platform/x86/ideapad-laptop.c | 19 +++++++++++++------
1 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index bfdda33..a5c0efa 100644
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -35,10 +35,15 @@

#define IDEAPAD_RFKILL_DEV_NUM (3)

+#define CFG_BT_BIT (16)
+#define CFG_3G_BIT (17)
+#define CFG_WIFI_BIT (18)
+
struct ideapad_private {
struct rfkill *rfk[IDEAPAD_RFKILL_DEV_NUM];
struct platform_device *platform_device;
struct input_dev *inputdev;
+ unsigned long cfg;
};

static acpi_handle ideapad_handle;
@@ -197,9 +202,9 @@ struct ideapad_rfk_data {
};

const struct ideapad_rfk_data ideapad_rfk_data[] = {
- { "ideapad_wlan", 18, 0x15, RFKILL_TYPE_WLAN },
- { "ideapad_bluetooth", 16, 0x17, RFKILL_TYPE_BLUETOOTH },
- { "ideapad_3g", 17, 0x20, RFKILL_TYPE_WWAN },
+ { "ideapad_wlan", CFG_WIFI_BIT, 0x15, RFKILL_TYPE_WLAN },
+ { "ideapad_bluetooth", CFG_BT_BIT, 0x17, RFKILL_TYPE_BLUETOOTH },
+ { "ideapad_3g", CFG_3G_BIT, 0x20, RFKILL_TYPE_WWAN },
};

static int ideapad_rfk_set(void *data, bool blocked)
@@ -393,10 +398,11 @@ MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);

static int __devinit ideapad_acpi_add(struct acpi_device *adevice)
{
- int ret, i, cfg;
+ int ret, i;
+ unsigned long cfg;
struct ideapad_private *priv;

- if (read_method_int(adevice->handle, "_CFG", &cfg))
+ if (read_method_int(adevice->handle, "_CFG", (int *)&cfg))
return -ENODEV;

priv = kzalloc(sizeof(*priv), GFP_KERNEL);
@@ -404,6 +410,7 @@ static int __devinit ideapad_acpi_add(struct acpi_device *adevice)
return -ENOMEM;
dev_set_drvdata(&adevice->dev, priv);
ideapad_handle = adevice->handle;
+ priv->cfg = cfg;

ret = ideapad_platform_init(priv);
if (ret)
@@ -414,7 +421,7 @@ static int __devinit ideapad_acpi_add(struct acpi_device *adevice)
goto input_failed;

for (i = 0; i < IDEAPAD_RFKILL_DEV_NUM; i++) {
- if (test_bit(ideapad_rfk_data[i].cfgbit, (unsigned long *)&cfg))
+ if (test_bit(ideapad_rfk_data[i].cfgbit, &cfg))
ideapad_register_rfkill(adevice, i);
else
priv->rfk[i] = NULL;
--
1.7.4.1


2011-06-02 09:24:14

by Ike Panhc

[permalink] [raw]
Subject: [PATCH 2/3] ideapad: Add nodes in sysfs

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 <[email protected]>
---
.../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 <[email protected]>"
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 <[email protected]>"
+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 <[email protected]>"
+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 <[email protected]>"
+Description:
+ Ideapad capability bits.
+
+What: /sys/devices/platform/ideapad/backlight
+Date: Jun 2011
+KernelVersion: 3.0.1
+Contact: "Ike Panhc <[email protected]>"
+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

2011-06-02 09:24:53

by Ike Panhc

[permalink] [raw]
Subject: [PATCH 3/3] ideapad: Show negative when no camera

Signed-off-by: Ike Panhc <[email protected]>
---
drivers/platform/x86/ideapad-laptop.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index 9c09891..4a54ed1 100644
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -38,6 +38,7 @@
#define CFG_BT_BIT (16)
#define CFG_3G_BIT (17)
#define CFG_WIFI_BIT (18)
+#define CFG_CAMERA_BIT (19)

struct ideapad_private {
struct rfkill *rfk[IDEAPAD_RFKILL_DEV_NUM];
@@ -199,6 +200,10 @@ static ssize_t show_ideapad_cam(struct device *dev,
struct device_attribute *attr,
char *buf)
{
+ struct ideapad_private *priv = dev_get_drvdata(dev);
+
+ if (!test_bit(CFG_CAMERA_BIT, &(priv->cfg)))
+ return sprintf(buf, "-1\n");
return show_ideapad_helper(dev, attr, buf, 0x1D);
}

--
1.7.4.1

2011-06-02 09:43:29

by Corentin Chary

[permalink] [raw]
Subject: Re: [PATCH 3/3] ideapad: Show negative when no camera

On Thu, Jun 2, 2011 at 11:24 AM, Ike Panhc <[email protected]> wrote:
> Signed-off-by: Ike Panhc <[email protected]>
> ---
>  drivers/platform/x86/ideapad-laptop.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
> index 9c09891..4a54ed1 100644
> --- a/drivers/platform/x86/ideapad-laptop.c
> +++ b/drivers/platform/x86/ideapad-laptop.c
> @@ -38,6 +38,7 @@
>  #define CFG_BT_BIT     (16)
>  #define CFG_3G_BIT     (17)
>  #define CFG_WIFI_BIT   (18)
> +#define CFG_CAMERA_BIT (19)
>
>  struct ideapad_private {
>        struct rfkill *rfk[IDEAPAD_RFKILL_DEV_NUM];
> @@ -199,6 +200,10 @@ static ssize_t show_ideapad_cam(struct device *dev,
>                                struct device_attribute *attr,
>                                char *buf)
>  {
> +       struct ideapad_private *priv = dev_get_drvdata(dev);
> +
> +       if (!test_bit(CFG_CAMERA_BIT, &(priv->cfg)))
> +               return sprintf(buf, "-1\n");
>        return show_ideapad_helper(dev, attr, buf, 0x1D);
>  }
>
> --
> 1.7.4.1
>
> --
> To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in
> the body of a message to [email protected]
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

I think it would be better to not add the file when the camera is not
available. Another option is to return -ENODEV. But printing -1
doesn't seems right.

--
Corentin Chary
http://xf.iksaif.net

2011-06-02 09:48:35

by Corentin Chary

[permalink] [raw]
Subject: Re: [PATCH 2/3] ideapad: Add nodes in sysfs

On Thu, Jun 2, 2011 at 11:24 AM, Ike Panhc <[email protected]> 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 <[email protected]>
> ---
>  .../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 <[email protected]>"
>  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 <[email protected]>"
> +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 <[email protected]>"
> +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 <[email protected]>"
> +Description:
> +               Ideapad capability bits.
> +
> +What:          /sys/devices/platform/ideapad/backlight
> +Date:          Jun 2011
> +KernelVersion: 3.0.1
> +Contact:       "Ike Panhc <[email protected]>"
> +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

2011-06-02 10:15:03

by Ike Panhc

[permalink] [raw]
Subject: Re: [PATCH 2/3] ideapad: Add nodes in sysfs

On 06/02/2011 05:48 PM, Corentin Chary wrote:
> 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).

This is within VPC2004. In DSDT they are different device from generic
backlight.

and I try bl_power but can not turning off power of whole LCD. No idea
how screensaver do it, looks like just cut off video signal.

2011-06-02 10:17:35

by Ike Panhc

[permalink] [raw]
Subject: Re: [PATCH 3/3] ideapad: Show negative when no camera

On 06/02/2011 05:43 PM, Corentin Chary wrote:
> I think it would be better to not add the file when the camera is not
> available. Another option is to return -ENODEV. But printing -1
> doesn't seems right.
>

Agree, making the node invisible is better.

2011-06-02 11:22:58

by Corentin Chary

[permalink] [raw]
Subject: Re: [PATCH 2/3] ideapad: Add nodes in sysfs

On Thu, Jun 2, 2011 at 12:14 PM, Ike Panhc <[email protected]> wrote:
> On 06/02/2011 05:48 PM, Corentin Chary wrote:
>> 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).
>
> This is within VPC2004. In DSDT they are different device from generic
> backlight.
>
> and I try bl_power but can not turning off power of whole LCD. No idea
> how screensaver do it, looks like just cut off video signal.

What I wanted to say is that you should use the generic backlight
class (!=driver) to expose these. You can look at asus-wmi.c to see
how it's done.
Then users will be able to choose the backlight implementation using
acpi_backlight=vendor or acpi_backlight=video.

--
Corentin Chary
http://xf.iksaif.net

2011-06-03 20:21:51

by Dmitry Torokhov

[permalink] [raw]
Subject: Re: [PATCH 2/3] ideapad: Add nodes in sysfs

On Thursday, June 02, 2011 02:24:05 AM Ike Panhc wrote:
> +What: /sys/devices/platform/ideapad/touchpad
> +Date: Jun 2011
> +KernelVersion: 3.0.1
> +Contact: "Ike Panhc <[email protected]>"
> +Description:
> + Control the power of touchpad. 1 means on, 0 means off.

I do not think that we should be adding attributes like this one.
Is there any way to pug it into device core/PM infrastructure?

Also, what is the driver for having this attribute? Is it power savings
or is it because some people prefer to turn off the touchpad because
it interferes with typing?

Thanks.

--
Dmitry