ACPI button: remove unused procfs I/F

Remove unused ACPI button procfs interface.
Only /proc/acpi/button/lid/LID/state remains.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 60 insertions, 103 deletions

diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 12c28f4adb67..d27d072472f9 100644
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -78,8 +78,6 @@ static int acpi_button_add(struct acpi_device *device);
 static int acpi_button_remove(struct acpi_device *device, int type);
 static int acpi_button_resume(struct acpi_device *device);
 static void acpi_button_notify(struct acpi_device *device, u32 event);
-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 = "button",
@@ -101,22 +99,6 @@ struct acpi_button {
         bool wakeup_enabled;
 };
 
-static const struct file_operations acpi_button_info_fops = {
-        .owner = THIS_MODULE,
-        .open = acpi_button_info_open_fs,
-        .read = seq_read,
-        .llseek = seq_lseek,
-        .release = single_release,
-};
-
-static const struct file_operations acpi_button_state_fops = {
-        .owner = THIS_MODULE,
-        .open = acpi_button_state_open_fs,
-        .read = seq_read,
-        .llseek = seq_lseek,
-        .release = single_release,
-};
-
 static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
 static struct acpi_device *lid_device;
 
@@ -125,20 +107,7 @@ static struct acpi_device *lid_device;
    -------------------------------------------------------------------------- */
 
 static struct proc_dir_entry *acpi_button_dir;
-
-static int acpi_button_info_seq_show(struct seq_file *seq, void *offset)
-{
-        struct acpi_device *device = seq->private;
-
-        seq_printf(seq, "type:                    %s\n",
-                   acpi_device_name(device));
-        return 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 struct proc_dir_entry *acpi_lid_dir;
 
 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
 {
@@ -158,77 +127,85 @@ 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 const struct file_operations acpi_button_state_fops = {
+        .owner = THIS_MODULE,
+        .open = acpi_button_state_open_fs,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
 
 static int acpi_button_add_fs(struct acpi_device *device)
 {
         struct acpi_button *button = acpi_driver_data(device);
         struct proc_dir_entry *entry = NULL;
+        int ret = 0;
 
-        switch (button->type) {
-        case ACPI_BUTTON_TYPE_POWER:
-                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:
-                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;
+        /* procfs I/F for ACPI lid device only */
+        if (button->type != ACPI_BUTTON_TYPE_LID)
+                return 0;
+
+        if (acpi_button_dir || acpi_lid_dir) {
+                printk(KERN_ERR PREFIX "More than one Lid device found!\n");
+                return -EEXIST;
         }
 
-        if (!entry)
+        /* create /proc/acpi/button */
+        acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
+        if (!acpi_button_dir)
                 return -ENODEV;
 
-        acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
-        if (!acpi_device_dir(device))
-                return -ENODEV;
+        /* create /proc/acpi/button/lid */
+        acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
+        if (!acpi_lid_dir) {
+                ret = -ENODEV;
+                goto remove_button_dir;
+        }
 
-        /* 'info' [R] */
-        entry = proc_create_data(ACPI_BUTTON_FILE_INFO,
-                                 S_IRUGO, acpi_device_dir(device),
-                                 &acpi_button_info_fops, device);
-        if (!entry)
-                return -ENODEV;
+        /* create /proc/acpi/button/lid/LID/ */
+        acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir);
+        if (!acpi_device_dir(device)) {
+                ret = -ENODEV;
+                goto remove_lid_dir;
+        }
 
-        /* show lid state [R] */
-        if (button->type == ACPI_BUTTON_TYPE_LID) {
-                entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
-                                         S_IRUGO, acpi_device_dir(device),
-                                         &acpi_button_state_fops, device);
-                if (!entry)
-                        return -ENODEV;
+        /* create /proc/acpi/button/lid/LID/state */
+        entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
+                                 S_IRUGO, acpi_device_dir(device),
+                                 &acpi_button_state_fops, device);
+        if (!entry) {
+                ret = -ENODEV;
+                goto remove_dev_dir;
         }
 
-        return 0;
+done:
+        return ret;
+
+remove_dev_dir:
+        remove_proc_entry(acpi_device_bid(device),
+                          acpi_lid_dir);
+        acpi_device_dir(device) = NULL;
+remove_lid_dir:
+        remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
+remove_button_dir:
+        remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
+        goto done;
 }
 
 static int acpi_button_remove_fs(struct acpi_device *device)
 {
         struct acpi_button *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));
+        if (button->type != ACPI_BUTTON_TYPE_LID)
+                return 0;
 
-                remove_proc_entry(acpi_device_bid(device),
-                                  acpi_device_dir(device)->parent);
-                acpi_device_dir(device) = NULL;
-        }
+        remove_proc_entry(ACPI_BUTTON_FILE_STATE,
+                          acpi_device_dir(device));
+        remove_proc_entry(acpi_device_bid(device),
+                          acpi_lid_dir);
+        acpi_device_dir(device) = NULL;
+        remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
+        remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
 
         return 0;
 }
@@ -468,32 +445,12 @@ static int acpi_button_remove(struct acpi_device *device, int type)
 
 static int __init acpi_button_init(void)
 {
-        int result;
-
-        acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
-        if (!acpi_button_dir)
-                return -ENODEV;
-
-        result = acpi_bus_register_driver(&acpi_button_driver);
-        if (result < 0) {
-                remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
-                return -ENODEV;
-        }
-
-        return 0;
+        return acpi_bus_register_driver(&acpi_button_driver);
 }
 
 static void __exit 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);
 }
 
 module_init(acpi_button_init);