ACPI: thinkpad-acpi: do not use named sysfs groups

The initial version of the thinkpad-acpi sysfs interface (not yet released
in any stable mainline kernel) made liberal use of named sysfs groups, in
order to get the attributes more organized.

This proved to be a really bad design decision.  Maybe if attribute groups
were as flexible as a real directory, and if binary attributes were not
second-class citizens, the idea of subdirs and named groups would not have
been so bad.

This patch makes all the thinkpad-acpi sysfs groups anonymous (thus
removing the subdirs), adds the former group names as a prefix (so that
hotkey/enable becomes hotkey_enable for example), and updates the
documentation.

These changes will make the thinkpad-acpi sysfs ABI a lot easier to
maintain.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>

Documentation/thinkpad-acpi.txt

@@ -138,7 +138,7 @@ Hot keys
 --------
 
 procfs: /proc/acpi/ibm/hotkey
-sysfs device attribute: hotkey/*
+sysfs device attribute: hotkey_*
 
 Without this driver, only the Fn-F4 key (sleep button) generates an
 ACPI event. With the driver loaded, the hotkey feature enabled and the
@@ -196,10 +196,7 @@ The following commands can be written to the /proc/acpi/ibm/hotkey file:
 
 sysfs notes:
 
-	The hot keys attributes are in a hotkey/ subdirectory off the
-	thinkpad device.
-
-	bios_enabled:
+	hotkey_bios_enabled:
 		Returns the status of the hot keys feature when
 		thinkpad-acpi was loaded.  Upon module unload, the hot
 		key feature status will be restored to this value.
@@ -207,19 +204,19 @@ sysfs notes:
 		0: hot keys were disabled
 		1: hot keys were enabled
 
-	bios_mask:
+	hotkey_bios_mask:
 		Returns the hot keys mask when thinkpad-acpi was loaded.
 		Upon module unload, the hot keys mask will be restored
 		to this value.
 
-	enable:
+	hotkey_enable:
 		Enables/disables the hot keys feature, and reports
 		current status of the hot keys feature.
 
 		0: disables the hot keys feature / feature disabled
 		1: enables the hot keys feature / feature enabled
 
-	mask:
+	hotkey_mask:
 		bit mask to enable ACPI event generation for each hot
 		key (see above).  Returns the current status of the hot
 		keys mask, and allows one to modify it.
@@ -229,7 +226,7 @@ Bluetooth
 ---------
 
 procfs: /proc/acpi/ibm/bluetooth
-sysfs device attribute: bluetooth/enable
+sysfs device attribute: bluetooth_enable
 
 This feature shows the presence and current state of a ThinkPad
 Bluetooth device in the internal ThinkPad CDC slot.
@@ -244,7 +241,7 @@ If Bluetooth is installed, the following commands can be used:
 Sysfs notes:
 
 	If the Bluetooth CDC card is installed, it can be enabled /
-	disabled through the "bluetooth/enable" thinkpad-acpi device
+	disabled through the "bluetooth_enable" thinkpad-acpi device
 	attribute, and its current status can also be queried.
 
 	enable:
@@ -252,7 +249,7 @@ Sysfs notes:
 		1: enables Bluetooth / Bluetooth is enabled.
 
 	Note: this interface will be probably be superseeded by the
-	generic rfkill class.
+	generic rfkill class, so it is NOT to be considered stable yet.
 
 Video output control -- /proc/acpi/ibm/video
 --------------------------------------------
@@ -898,7 +895,7 @@ EXPERIMENTAL: WAN
 -----------------
 
 procfs: /proc/acpi/ibm/wan
-sysfs device attribute: wwan/enable
+sysfs device attribute: wwan_enable
 
 This feature is marked EXPERIMENTAL because the implementation
 directly accesses hardware registers and may not work as expected. USE
@@ -921,7 +918,7 @@ If the W-WAN card is installed, the following commands can be used:
 Sysfs notes:
 
 	If the W-WAN card is installed, it can be enabled /
-	disabled through the "wwan/enable" thinkpad-acpi device
+	disabled through the "wwan_enable" thinkpad-acpi device
 	attribute, and its current status can also be queried.
 
 	enable:
@@ -929,7 +926,7 @@ Sysfs notes:
 		1: enables WWAN card / WWAN card is enabled.
 
 	Note: this interface will be probably be superseeded by the
-	generic rfkill class.
+	generic rfkill class, so it is NOT to be considered stable yet.
 
 Multiple Commands, Module Parameters
 ------------------------------------

drivers/misc/thinkpad_acpi.c

@@ -740,7 +740,7 @@ static ssize_t hotkey_enable_store(struct device *dev,
 }
 
 static struct device_attribute dev_attr_hotkey_enable =
-	__ATTR(enable, S_IWUSR | S_IRUGO,
+	__ATTR(hotkey_enable, S_IWUSR | S_IRUGO,
 		hotkey_enable_show, hotkey_enable_store);
 
 /* sysfs hotkey mask --------------------------------------------------- */
@@ -775,7 +775,7 @@ static ssize_t hotkey_mask_store(struct device *dev,
 }
 
 static struct device_attribute dev_attr_hotkey_mask =
-	__ATTR(mask, S_IWUSR | S_IRUGO,
+	__ATTR(hotkey_mask, S_IWUSR | S_IRUGO,
 		hotkey_mask_show, hotkey_mask_store);
 
 /* sysfs hotkey bios_enabled ------------------------------------------- */
@@ -787,7 +787,7 @@ static ssize_t hotkey_bios_enabled_show(struct device *dev,
 }
 
 static struct device_attribute dev_attr_hotkey_bios_enabled =
-	__ATTR(bios_enabled, S_IRUGO, hotkey_bios_enabled_show, NULL);
+	__ATTR(hotkey_bios_enabled, S_IRUGO, hotkey_bios_enabled_show, NULL);
 
 /* sysfs hotkey bios_mask ---------------------------------------------- */
 static ssize_t hotkey_bios_mask_show(struct device *dev,
@@ -798,7 +798,7 @@ static ssize_t hotkey_bios_mask_show(struct device *dev,
 }
 
 static struct device_attribute dev_attr_hotkey_bios_mask =
-	__ATTR(bios_mask, S_IRUGO, hotkey_bios_mask_show, NULL);
+	__ATTR(hotkey_bios_mask, S_IRUGO, hotkey_bios_mask_show, NULL);
 
 /* --------------------------------------------------------------------- */
 
@@ -824,8 +824,7 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
 		str_supported(tp_features.hotkey));
 
 	if (tp_features.hotkey) {
-		hotkey_dev_attributes = create_attr_set(4,
-						TPACPI_HOTKEY_SYSFS_GROUP);
+		hotkey_dev_attributes = create_attr_set(4, NULL);
 		if (!hotkey_dev_attributes)
 			return -ENOMEM;
 		res = add_to_attr_set(hotkey_dev_attributes,
@@ -1050,7 +1049,7 @@ static ssize_t bluetooth_enable_store(struct device *dev,
 }
 
 static struct device_attribute dev_attr_bluetooth_enable =
-	__ATTR(enable, S_IWUSR | S_IRUGO,
+	__ATTR(bluetooth_enable, S_IWUSR | S_IRUGO,
 		bluetooth_enable_show, bluetooth_enable_store);
 
 /* --------------------------------------------------------------------- */
@@ -1061,7 +1060,6 @@ static struct attribute *bluetooth_attributes[] = {
 };
 
 static const struct attribute_group bluetooth_attr_group = {
-	.name = TPACPI_BLUETH_SYSFS_GROUP,
 	.attrs = bluetooth_attributes,
 };
 
@@ -1215,7 +1213,7 @@ static ssize_t wan_enable_store(struct device *dev,
 }
 
 static struct device_attribute dev_attr_wan_enable =
-	__ATTR(enable, S_IWUSR | S_IRUGO,
+	__ATTR(wwan_enable, S_IWUSR | S_IRUGO,
 		wan_enable_show, wan_enable_store);
 
 /* --------------------------------------------------------------------- */
@@ -1226,7 +1224,6 @@ static struct attribute *wan_attributes[] = {
 };
 
 static const struct attribute_group wan_attr_group = {
-	.name = TPACPI_WAN_SYSFS_GROUP,
 	.attrs = wan_attributes,
 };
 

drivers/misc/thinkpad_acpi.h

@@ -278,8 +278,6 @@ static int beep_write(char *buf);
  * Bluetooth subdriver
  */
 
-#define TPACPI_BLUETH_SYSFS_GROUP "bluetooth"
-
 enum {
 	/* ACPI GBDC/SBDC bits */
 	TP_ACPI_BLUETOOTH_HWPRESENT	= 0x01,	/* Bluetooth hw available */
@@ -416,8 +414,6 @@ static int fan_write_cmd_watchdog(const char *cmd, int *rc);
  * Hotkey subdriver
  */
 
-#define TPACPI_HOTKEY_SYSFS_GROUP "hotkey"
-
 static int hotkey_orig_status;
 static int hotkey_orig_mask;
 
@@ -553,8 +549,6 @@ static int volume_write(char *buf);
  * Wan subdriver
  */
 
-#define TPACPI_WAN_SYSFS_GROUP "wwan"
-
 enum {
 	/* ACPI GWAN/SWAN bits */
 	TP_ACPI_WANCARD_HWPRESENT	= 0x01,	/* Wan hw available */