CHROMIUMOS: chromeos_acpi: Introduce ability to handle buffers.

drivers/platform/x86/chromeos.c

 /*
  *  ChromeOS platform support code. Glue layer between higher level functions
  *  and per-platform firmware interfaces.
  *
  *  Copyright (C) 2010 The Chromium OS Authors
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
@@ skipping 14 matching lines @@
  */
 
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/nvram.h>
 #include <linux/types.h>
 #include <linux/chromeos_platform.h>
 
 #include "chromeos_acpi.h"
 
+/* Values set at probe time */
+int chromeos_acpi_chnv = -1;
+EXPORT_SYMBOL_GPL(chromeos_acpi_chnv);
+
+int chromeos_acpi_chsw = -1;
+EXPORT_SYMBOL_GPL(chromeos_acpi_chsw);
+
+bool chromeos_acpi_available;
+EXPORT_SYMBOL_GPL(chromeos_acpi_available);
+
 static bool chromeos_inited;
 
 static void chromeos_set_nvram_flag(int index, unsigned char flag)
 {
         unsigned char cur;
 
         cur = nvram_read_byte(index);
         /* already set. */
         if (cur & flag)
                 return;
@@ skipping 12 matching lines @@
         return (chsw < 0) || (chsw & CHSW_DEVELOPER_MODE);
 }
 EXPORT_SYMBOL(chromeos_is_devmode);
 
 int chromeos_set_need_recovery(void)
 {
         if (!chromeos_inited)
                 return -ENODEV;
 
         if (chromeos_acpi_chnv < 0) {
-                pr_warning("chromeos_set_need_recovery(): Can't write to nvram\n");
+                pr_warning("%s: Can't write to nvram\n", __func__);
                 return -ENODEV;
         }
 
         chromeos_set_nvram_flag(chromeos_acpi_chnv, CHNV_RECOVERY_FLAG);
 
         return 0;
 }
 EXPORT_SYMBOL(chromeos_set_need_recovery);
 
 bool chromeos_initialized(void)
@@ skipping 10 matching lines @@
         printk(KERN_INFO "Chrome OS platform detected\n");
         chromeos_inited = true;
         return 0;
 }
 subsys_initcall_sync(chromeos_init);
 
 
 MODULE_AUTHOR("The Chromium OS Authors");
 MODULE_DESCRIPTION("Chrome OS Platform Extras");
 MODULE_LICENSE("GPL");