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");
84