xo1-rfkill.c revision b859f15921321b7bf4cb4cf188e31a6a25d2dff3 
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
17static bool card_blocked;
18
19static 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
39static const struct rfkill_ops rfkill_ops = {
40	.set_block = rfkill_set_block,
41};
42
43static 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
63static 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
71static struct platform_driver xo1_rfkill_driver = {
72	.driver = {
73		.name = "xo1-rfkill",
74		.owner = THIS_MODULE,
75	},
76	.probe		= xo1_rfkill_probe,
77	.remove		= xo1_rfkill_remove,
78};
79
80module_platform_driver(xo1_rfkill_driver);
81
82MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>");
83MODULE_LICENSE("GPL");
84MODULE_ALIAS("platform:xo1-rfkill");
85