drivers/platform/x86/xo1-rfkill.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Support for rfkill through the OLPC XO-1 laptop embedded controller
   4  *
   5  * Copyright (C) 2010 One Laptop per Child
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/rfkill.h>
  11 #include <linux/olpc-ec.h>
  12
  13 static bool card_blocked;
  14
  15 static int rfkill_set_block(void *data, bool blocked)
  16 {
  17         unsigned char cmd;
  18         int r;
  19
  20         if (blocked == card_blocked)
  21                 return 0;
  22
  23         if (blocked)
  24                 cmd = EC_WLAN_ENTER_RESET;
  25         else
  26                 cmd = EC_WLAN_LEAVE_RESET;
  27
  28         r = olpc_ec_cmd(cmd, NULL, 0, NULL, 0);
  29         if (r == 0)
  30                 card_blocked = blocked;
  31
  32         return r;
  33 }
  34
  35 static const struct rfkill_ops rfkill_ops = {
  36         .set_block = rfkill_set_block,
  37 };
  38
  39 static int xo1_rfkill_probe(struct platform_device *pdev)
  40 {
  41         struct rfkill *rfk;
  42         int r;
  43
  44         rfk = rfkill_alloc(pdev->name, &pdev->dev, RFKILL_TYPE_WLAN,
  45                            &rfkill_ops, NULL);
  46         if (!rfk)
  47                 return -ENOMEM;
  48
  49         r = rfkill_register(rfk);
  50         if (r) {
  51                 rfkill_destroy(rfk);
  52                 return r;
  53         }
  54
  55         platform_set_drvdata(pdev, rfk);
  56         return 0;
  57 }
  58
  59 static int xo1_rfkill_remove(struct platform_device *pdev)
  60 {
  61         struct rfkill *rfk = platform_get_drvdata(pdev);
  62         rfkill_unregister(rfk);
  63         rfkill_destroy(rfk);
  64         return 0;
  65 }
  66
  67 static struct platform_driver xo1_rfkill_driver = {
  68         .driver = {
  69                 .name = "xo1-rfkill",
  70         },
  71         .probe          = xo1_rfkill_probe,
  72         .remove         = xo1_rfkill_remove,
  73 };
  74
  75 module_platform_driver(xo1_rfkill_driver);
  76
  77 MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>");
  78 MODULE_LICENSE("GPL");
  79 MODULE_ALIAS("platform:xo1-rfkill");