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 | |
13 | static bool card_blocked; |
14 | |
15 | static 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 | |
35 | static const struct rfkill_ops rfkill_ops = { |
36 | .set_block = rfkill_set_block, |
37 | }; |
38 | |
39 | static 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 | |
59 | static 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 | |
66 | static 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 | |
74 | module_platform_driver(xo1_rfkill_driver); |
75 | |
76 | MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>" ); |
77 | MODULE_LICENSE("GPL" ); |
78 | MODULE_ALIAS("platform:xo1-rfkill" ); |
79 | |