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
rfkill_set_block(void * data,bool blocked)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
xo1_rfkill_probe(struct platform_device * pdev)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
xo1_rfkill_remove(struct platform_device * pdev)59 static void 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 }
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