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/drivers/platform/x86/xo1-rfkill.c

http://github.com/mirrors/linux
C | 79 lines | 57 code | 16 blank | 6 comment | 7 complexity | 8ea7dde5540735f8ab9667bffac07ddd MD5 | raw file
 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
13static bool card_blocked;
14
15static 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
35static const struct rfkill_ops rfkill_ops = {
36	.set_block = rfkill_set_block,
37};
38
39static 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
59static 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
67static 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
75module_platform_driver(xo1_rfkill_driver);
76
77MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>");
78MODULE_LICENSE("GPL");
79MODULE_ALIAS("platform:xo1-rfkill");