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, inlen: 0, NULL, outlen: 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(name: pdev->name, parent: &pdev->dev, type: RFKILL_TYPE_WLAN,
45 ops: &rfkill_ops, NULL);
46 if (!rfk)
47 return -ENOMEM;
48
49 r = rfkill_register(rfkill: rfk);
50 if (r) {
51 rfkill_destroy(rfkill: rfk);
52 return r;
53 }
54
55 platform_set_drvdata(pdev, data: rfk);
56 return 0;
57}
58
59static void xo1_rfkill_remove(struct platform_device *pdev)
60{
61 struct rfkill *rfk = platform_get_drvdata(pdev);
62 rfkill_unregister(rfkill: rfk);
63 rfkill_destroy(rfkill: rfk);
64}
65
66static struct platform_driver xo1_rfkill_driver = {
67 .driver = {
68 .name = "xo1-rfkill",
69 },
70 .probe = xo1_rfkill_probe,
71 .remove_new = xo1_rfkill_remove,
72};
73
74module_platform_driver(xo1_rfkill_driver);
75
76MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>");
77MODULE_LICENSE("GPL");
78MODULE_ALIAS("platform:xo1-rfkill");
79

source code of linux/drivers/platform/x86/xo1-rfkill.c