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

[Ike Panhc <ike.pan@canonical.com>]

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@canonical.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@canonical.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@canonical.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@canonical.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@canonical.com>"
+Description:
+		Ideapad capability bits.
+
+What:		/sys/devices/platform/ideapad/backlight
+Date:		Jun 2011
+KernelVersion:	3.0.1
+Contact:	"Ike Panhc <ike.pan@canonical.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