[ACPI] restore /proc/acpi/button/ (ala 2.6.12)

Signed-off-by Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by Len Brown <len.brown@intel.com>

1 files changed, 205 insertions, 1 deletions

diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 0f45d45f05a..8162fd0c21a 100644
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -26,6 +26,9 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
+#include <linux/types.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
 
@@ -33,6 +36,9 @@
 #define ACPI_BUTTON_COMPONENT           0x00080000
 #define ACPI_BUTTON_DRIVER_NAME         "ACPI Button Driver"
 #define ACPI_BUTTON_CLASS               "button"
+#define ACPI_BUTTON_FILE_INFO           "info"
+#define ACPI_BUTTON_FILE_STATE          "state"
+#define ACPI_BUTTON_TYPE_UNKNOWN        0x00
 #define ACPI_BUTTON_NOTIFY_STATUS       0x80
 
 #define ACPI_BUTTON_SUBCLASS_POWER      "power"
@@ -64,6 +70,8 @@ MODULE_LICENSE("GPL");
 
 static int acpi_button_add (struct acpi_device *device);
 static int acpi_button_remove (struct acpi_device *device, int type);
+static int acpi_button_info_open_fs(struct inode *inode, struct file *file);
+static int acpi_button_state_open_fs(struct inode *inode, struct file *file);
 
 static struct acpi_driver acpi_button_driver = {
         .name =         ACPI_BUTTON_DRIVER_NAME,
@@ -82,6 +90,179 @@ struct acpi_button {
         unsigned long           pushed;
 };
 
+static struct file_operations acpi_button_info_fops = {
+        .open           = acpi_button_info_open_fs,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static struct file_operations acpi_button_state_fops = {
+        .open           = acpi_button_state_open_fs,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+/* --------------------------------------------------------------------------
+                              FS Interface (/proc)
+   -------------------------------------------------------------------------- */
+
+static struct proc_dir_entry    *acpi_button_dir;
+
+static int acpi_button_info_seq_show(struct seq_file *seq, void *offset)
+{
+        struct acpi_button      *button = (struct acpi_button *) seq->private;
+
+        ACPI_FUNCTION_TRACE("acpi_button_info_seq_show");
+
+        if (!button || !button->device)
+                return_VALUE(0);
+
+        seq_printf(seq, "type:                    %s\n", 
+                acpi_device_name(button->device));
+
+        return_VALUE(0);
+}
+
+static int acpi_button_info_open_fs(struct inode *inode, struct file *file)
+{
+        return single_open(file, acpi_button_info_seq_show, PDE(inode)->data);
+}
+        
+static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
+{
+        struct acpi_button      *button = (struct acpi_button *) seq->private;
+        acpi_status             status;
+        unsigned long           state;
+
+        ACPI_FUNCTION_TRACE("acpi_button_state_seq_show");
+
+        if (!button || !button->device)
+                return_VALUE(0);
+
+        status = acpi_evaluate_integer(button->handle,"_LID",NULL,&state);
+        if (ACPI_FAILURE(status)) {
+                seq_printf(seq, "state:      unsupported\n");
+        }
+        else{
+                seq_printf(seq, "state:      %s\n", (state ? "open" : "closed")); 
+        }
+
+        return_VALUE(0);
+}
+
+static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
+{
+        return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
+}
+
+static struct proc_dir_entry *acpi_power_dir;
+static struct proc_dir_entry *acpi_sleep_dir;
+static struct proc_dir_entry *acpi_lid_dir;
+
+static int
+acpi_button_add_fs (
+        struct acpi_device      *device)
+{
+        struct proc_dir_entry   *entry = NULL;
+        struct acpi_button      *button = NULL;
+
+        ACPI_FUNCTION_TRACE("acpi_button_add_fs");
+
+        if (!device || !acpi_driver_data(device))
+                return_VALUE(-EINVAL);
+
+        button = acpi_driver_data(device);
+
+        switch (button->type) {
+        case ACPI_BUTTON_TYPE_POWER:
+        case ACPI_BUTTON_TYPE_POWERF:
+                if (!acpi_power_dir)
+                        acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER, 
+                                acpi_button_dir);
+                entry = acpi_power_dir;
+                break;
+        case ACPI_BUTTON_TYPE_SLEEP:
+        case ACPI_BUTTON_TYPE_SLEEPF:
+                if (!acpi_sleep_dir)
+                        acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP, 
+                                acpi_button_dir);
+                entry = acpi_sleep_dir;
+                break;
+        case ACPI_BUTTON_TYPE_LID:
+                if (!acpi_lid_dir)
+                        acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, 
+                                acpi_button_dir);
+                entry = acpi_lid_dir;
+                break;
+        }
+
+        if (!entry)
+                return_VALUE(-ENODEV);
+        entry->owner = THIS_MODULE;
+
+        acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
+        if (!acpi_device_dir(device))
+                return_VALUE(-ENODEV);
+        acpi_device_dir(device)->owner = THIS_MODULE;
+
+        /* 'info' [R] */
+        entry = create_proc_entry(ACPI_BUTTON_FILE_INFO,
+                S_IRUGO, acpi_device_dir(device));
+        if (!entry)
+                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                        "Unable to create '%s' fs entry\n",
+                        ACPI_BUTTON_FILE_INFO));
+        else {
+                entry->proc_fops = &acpi_button_info_fops;
+                entry->data = acpi_driver_data(device);
+                entry->owner = THIS_MODULE;
+        }
+
+        /* show lid state [R] */
+        if (button->type == ACPI_BUTTON_TYPE_LID) {
+                entry = create_proc_entry(ACPI_BUTTON_FILE_STATE,
+                        S_IRUGO, acpi_device_dir(device));
+                if (!entry)
+                        ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+                                "Unable to create '%s' fs entry\n",
+                                ACPI_BUTTON_FILE_INFO));
+                else {
+                        entry->proc_fops = &acpi_button_state_fops;
+                        entry->data = acpi_driver_data(device);
+                        entry->owner = THIS_MODULE;
+                }
+        }
+
+        return_VALUE(0);
+}
+
+
+static int
+acpi_button_remove_fs (
+        struct acpi_device      *device)
+{
+        struct acpi_button      *button = NULL;
+
+        ACPI_FUNCTION_TRACE("acpi_button_remove_fs");
+
+        button = acpi_driver_data(device);
+        if (acpi_device_dir(device)) {
+                if (button->type == ACPI_BUTTON_TYPE_LID)
+                        remove_proc_entry(ACPI_BUTTON_FILE_STATE,
+                                             acpi_device_dir(device));
+                remove_proc_entry(ACPI_BUTTON_FILE_INFO,
+                                     acpi_device_dir(device));
+
+                remove_proc_entry(acpi_device_bid(device),
+                                     acpi_device_dir(device)->parent);
+                acpi_device_dir(device) = NULL;
+        }
+
+        return_VALUE(0);
+}
+
+
 /* --------------------------------------------------------------------------
                                 Driver Interface
    -------------------------------------------------------------------------- */
@@ -121,7 +302,8 @@ acpi_button_notify_fixed (
         
         ACPI_FUNCTION_TRACE("acpi_button_notify_fixed");
 
-        BUG_ON(!button);
+        if (!button)
+                return_ACPI_STATUS(AE_BAD_PARAMETER);
 
         acpi_button_notify(button->handle, ACPI_BUTTON_NOTIFY_STATUS, button);
 
@@ -197,6 +379,10 @@ acpi_button_add (
                 goto end;
         }
 
+        result = acpi_button_add_fs(device);
+        if (result)
+                goto end;
+
         switch (button->type) {
         case ACPI_BUTTON_TYPE_POWERF:
                 status = acpi_install_fixed_event_handler (
@@ -240,6 +426,7 @@ acpi_button_add (
 
 end:
         if (result) {
+                acpi_button_remove_fs(device);
                 kfree(button);
         }
 
@@ -280,6 +467,8 @@ acpi_button_remove (struct acpi_device *device, int type)
                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
                         "Error removing notify handler\n"));
 
+        acpi_button_remove_fs(device);  
+
         kfree(button);
 
         return_VALUE(0);
@@ -293,14 +482,20 @@ acpi_button_init (void)
 
         ACPI_FUNCTION_TRACE("acpi_button_init");
 
+        acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
+        if (!acpi_button_dir)
+                return_VALUE(-ENODEV);
+        acpi_button_dir->owner = THIS_MODULE;
         result = acpi_bus_register_driver(&acpi_button_driver);
         if (result < 0) {
+                remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
                 return_VALUE(-ENODEV);
         }
 
         return_VALUE(0);
 }
 
+
 static void __exit
 acpi_button_exit (void)
 {
@@ -308,8 +503,17 @@ acpi_button_exit (void)
 
         acpi_bus_unregister_driver(&acpi_button_driver);
 
+        if (acpi_power_dir) 
+                remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir);
+        if (acpi_sleep_dir)
+                remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir);
+        if (acpi_lid_dir)
+                remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
+        remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
+
         return_VOID;
 }
 
+
 module_init(acpi_button_init);
 module_exit(acpi_button_exit);