cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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xo1-rfkill.c (1509B)

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