| 1 | /* |
| 2 | * Support for rfkill through the OLPC XO-1 laptop embedded controller |
| 3 | * |
| 4 | * Copyright (C) 2010 One Laptop per Child |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/platform_device.h> |
| 14 | #include <linux/rfkill.h> |
| 15 | #include <linux/olpc-ec.h> |
| 16 | |
| 17 | static bool card_blocked; |
| 18 | |
| 19 | static int rfkill_set_block(void *data, bool blocked) |
| 20 | { |
| 21 | unsigned char cmd; |
| 22 | int r; |
| 23 | |
| 24 | if (blocked == card_blocked) |
| 25 | return 0; |
| 26 | |
| 27 | if (blocked) |
| 28 | cmd = EC_WLAN_ENTER_RESET; |
| 29 | else |
| 30 | cmd = EC_WLAN_LEAVE_RESET; |
| 31 | |
| 32 | r = olpc_ec_cmd(cmd, NULL, 0, NULL, 0); |
| 33 | if (r == 0) |
| 34 | card_blocked = blocked; |
| 35 | |
| 36 | return r; |
| 37 | } |
| 38 | |
| 39 | static const struct rfkill_ops rfkill_ops = { |
| 40 | .set_block = rfkill_set_block, |
| 41 | }; |
| 42 | |
| 43 | static int xo1_rfkill_probe(struct platform_device *pdev) |
| 44 | { |
| 45 | struct rfkill *rfk; |
| 46 | int r; |
| 47 | |
| 48 | rfk = rfkill_alloc(pdev->name, &pdev->dev, RFKILL_TYPE_WLAN, |
| 49 | &rfkill_ops, NULL); |
| 50 | if (!rfk) |
| 51 | return -ENOMEM; |
| 52 | |
| 53 | r = rfkill_register(rfk); |
| 54 | if (r) { |
| 55 | rfkill_destroy(rfk); |
| 56 | return r; |
| 57 | } |
| 58 | |
| 59 | platform_set_drvdata(pdev, rfk); |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | static int xo1_rfkill_remove(struct platform_device *pdev) |
| 64 | { |
| 65 | struct rfkill *rfk = platform_get_drvdata(pdev); |
| 66 | rfkill_unregister(rfk); |
| 67 | rfkill_destroy(rfk); |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | static struct platform_driver xo1_rfkill_driver = { |
| 72 | .driver = { |
| 73 | .name = "xo1-rfkill", |
| 74 | }, |
| 75 | .probe = xo1_rfkill_probe, |
| 76 | .remove = xo1_rfkill_remove, |
| 77 | }; |
| 78 | |
| 79 | module_platform_driver(xo1_rfkill_driver); |
| 80 | |
| 81 | MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>"); |
| 82 | MODULE_LICENSE("GPL"); |
| 83 | MODULE_ALIAS("platform:xo1-rfkill"); |