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
rfkill_set_block(void * data,bool blocked)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
xo1_rfkill_probe(struct platform_device * pdev)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
xo1_rfkill_remove(struct platform_device * pdev)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