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 
16 #include <asm/olpc.h>
17 
18 static int rfkill_set_block(void *data, bool blocked)
19 {
20 	unsigned char cmd;
21 	if (blocked)
22 		cmd = EC_WLAN_ENTER_RESET;
23 	else
24 		cmd = EC_WLAN_LEAVE_RESET;
25 
26 	return olpc_ec_cmd(cmd, NULL, 0, NULL, 0);
27 }
28 
29 static const struct rfkill_ops rfkill_ops = {
30 	.set_block = rfkill_set_block,
31 };
32 
33 static int __devinit xo1_rfkill_probe(struct platform_device *pdev)
34 {
35 	struct rfkill *rfk;
36 	int r;
37 
38 	rfk = rfkill_alloc(pdev->name, &pdev->dev, RFKILL_TYPE_WLAN,
39 			   &rfkill_ops, NULL);
40 	if (!rfk)
41 		return -ENOMEM;
42 
43 	r = rfkill_register(rfk);
44 	if (r) {
45 		rfkill_destroy(rfk);
46 		return r;
47 	}
48 
49 	platform_set_drvdata(pdev, rfk);
50 	return 0;
51 }
52 
53 static int __devexit xo1_rfkill_remove(struct platform_device *pdev)
54 {
55 	struct rfkill *rfk = platform_get_drvdata(pdev);
56 	rfkill_unregister(rfk);
57 	rfkill_destroy(rfk);
58 	return 0;
59 }
60 
61 static struct platform_driver xo1_rfkill_driver = {
62 	.driver = {
63 		.name = "xo1-rfkill",
64 		.owner = THIS_MODULE,
65 	},
66 	.probe		= xo1_rfkill_probe,
67 	.remove		= __devexit_p(xo1_rfkill_remove),
68 };
69 
70 static int __init xo1_rfkill_init(void)
71 {
72 	return platform_driver_register(&xo1_rfkill_driver);
73 }
74 
75 static void __exit xo1_rfkill_exit(void)
76 {
77 	platform_driver_unregister(&xo1_rfkill_driver);
78 }
79 
80 MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>");
81 MODULE_LICENSE("GPL");
82 MODULE_ALIAS("platform:xo1-rfkill");
83 
84 module_init(xo1_rfkill_init);
85 module_exit(xo1_rfkill_exit);
86