ACPI: Advertise to BIOS in _OSC: _OST on _PPC changes

[safe/jmp/linux-2.6] / drivers / acpi / debug.c

diff --git a/drivers/acpi/debug.c b/drivers/acpi/debug.c
index 8a690c3..cc421b7 100644 (file)
--- a/drivers/acpi/debug.c
+++ b/drivers/acpi/debug.c
@@ -8,6 +8,7 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/moduleparam.h>
+#include <linux/debugfs.h>
 #include <asm/uaccess.h>
 #include <acpi/acpi_drivers.h>
 
@@ -196,6 +197,80 @@ module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
                  NULL, 0644);
 
 /* --------------------------------------------------------------------------
+                               DebugFS Interface
+   -------------------------------------------------------------------------- */
+
+static ssize_t cm_write(struct file *file, const char __user *user_buf,
+                       size_t count, loff_t *ppos)
+{
+       static char *buf;
+       static int uncopied_bytes;
+       struct acpi_table_header table;
+       acpi_status status;
+
+       if (!(*ppos)) {
+               /* parse the table header to get the table length */
+               if (count <= sizeof(struct acpi_table_header))
+                       return -EINVAL;
+               if (copy_from_user(&table, user_buf,
+                       sizeof(struct acpi_table_header)))
+                       return -EFAULT;
+               uncopied_bytes = table.length;
+               buf = kzalloc(uncopied_bytes, GFP_KERNEL);
+               if (!buf)
+                       return -ENOMEM;
+       }
+
+       if (uncopied_bytes < count) {
+               kfree(buf);
+               return -EINVAL;
+       }
+
+       if (copy_from_user(buf + (*ppos), user_buf, count)) {
+               kfree(buf);
+               return -EFAULT;
+       }
+
+       uncopied_bytes -= count;
+       *ppos += count;
+
+       if (!uncopied_bytes) {
+               status = acpi_install_method(buf);
+               kfree(buf);
+               if (ACPI_FAILURE(status))
+                       return -EINVAL;
+               add_taint(TAINT_OVERRIDDEN_ACPI_TABLE);
+       }
+
+       return count;
+}
+
+static const struct file_operations cm_fops = {
+       .write = cm_write,
+};
+
+static int acpi_debugfs_init(void)
+{
+       struct dentry *acpi_dir, *cm_dentry;
+
+       acpi_dir = debugfs_create_dir("acpi", NULL);
+       if (!acpi_dir)
+               goto err;
+
+       cm_dentry = debugfs_create_file("custom_method", S_IWUGO,
+                                       acpi_dir, NULL, &cm_fops);
+       if (!cm_dentry)
+               goto err;
+
+       return 0;
+
+err:
+       if (acpi_dir)
+               debugfs_remove(acpi_dir);
+       return -EINVAL;
+}
+
+/* --------------------------------------------------------------------------
                               FS Interface (/proc)
    -------------------------------------------------------------------------- */
 #ifdef CONFIG_ACPI_PROCFS
@@ -286,7 +361,7 @@ static const struct file_operations acpi_system_debug_proc_fops = {
 };
 #endif
 
-int __init acpi_debug_init(void)
+int __init acpi_procfs_init(void)
 {
 #ifdef CONFIG_ACPI_PROCFS
        struct proc_dir_entry *entry;
@@ -321,3 +396,10 @@ int __init acpi_debug_init(void)
        return 0;
 #endif
 }
+
+int __init acpi_debug_init(void)
+{
+       acpi_debugfs_init();
+       acpi_procfs_init();
+       return 0;
+}