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, 0, NULL, 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(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 
59 static 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 
67 static 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 
75 module_platform_driver(xo1_rfkill_driver);
76 
77 MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>");
78 MODULE_LICENSE("GPL");
79 MODULE_ALIAS("platform:xo1-rfkill");
80