kernel/drivers/platform/x86/xo1-rfkill.c

   1 /*
   2  * Support for rfkill through the OLPC XO-1 laptop embedded controller
   3  *
   4  * Copyright (C) 2010 One Laptop per Child
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/rfkill.h>
  15 #include <linux/olpc-ec.h>
  16
  17 static bool card_blocked;
  18
  19 static int rfkill_set_block(void *data, bool blocked)
  20 {
  21         unsigned char cmd;
  22         int r;
  23
  24         if (blocked == card_blocked)
  25                 return 0;
  26
  27         if (blocked)
  28                 cmd = EC_WLAN_ENTER_RESET;
  29         else
  30                 cmd = EC_WLAN_LEAVE_RESET;
  31
  32         r = olpc_ec_cmd(cmd, NULL, 0, NULL, 0);
  33         if (r == 0)
  34                 card_blocked = blocked;
  35
  36         return r;
  37 }
  38
  39 static const struct rfkill_ops rfkill_ops = {
  40         .set_block = rfkill_set_block,
  41 };
  42
  43 static int xo1_rfkill_probe(struct platform_device *pdev)
  44 {
  45         struct rfkill *rfk;
  46         int r;
  47
  48         rfk = rfkill_alloc(pdev->name, &pdev->dev, RFKILL_TYPE_WLAN,
  49                            &rfkill_ops, NULL);
  50         if (!rfk)
  51                 return -ENOMEM;
  52
  53         r = rfkill_register(rfk);
  54         if (r) {
  55                 rfkill_destroy(rfk);
  56                 return r;
  57         }
  58
  59         platform_set_drvdata(pdev, rfk);
  60         return 0;
  61 }
  62
  63 static int xo1_rfkill_remove(struct platform_device *pdev)
  64 {
  65         struct rfkill *rfk = platform_get_drvdata(pdev);
  66         rfkill_unregister(rfk);
  67         rfkill_destroy(rfk);
  68         return 0;
  69 }
  70
  71 static struct platform_driver xo1_rfkill_driver = {
  72         .driver = {
  73                 .name = "xo1-rfkill",
  74         },
  75         .probe          = xo1_rfkill_probe,
  76         .remove         = xo1_rfkill_remove,
  77 };
  78
  79 module_platform_driver(xo1_rfkill_driver);
  80
  81 MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>");
  82 MODULE_LICENSE("GPL");
  83 MODULE_ALIAS("platform:xo1-rfkill");