1/*
  2 * Support for rfkill on some Fujitsu-Siemens Amilo laptops.
  3 * Copyright 2011 Ben Hutchings.
  4 *
  5 * Based in part on the fsam7440 driver, which is:
  6 * Copyright 2005 Alejandro Vidal Mata & Javier Vidal Mata.
  7 * and on the fsaa1655g driver, which is:
  8 * Copyright 2006 Martin Večeřa.
  9 *
 10 * This program is free software; you can redistribute it and/or modify
 11 * it under the terms of the GNU General Public License as published by
 12 * the Free Software Foundation; either version 2 of the License, or
 13 * (at your option) any later version.
 14 */
 15
 16#include <linux/module.h>
 17#include <linux/dmi.h>
 18#include <linux/i8042.h>
 19#include <linux/io.h>
 20#include <linux/moduleparam.h>
 21#include <linux/platform_device.h>
 22#include <linux/rfkill.h>
 23
 24/*
 25 * These values were obtained from disassembling and debugging the
 26 * PM.exe program installed in the Fujitsu-Siemens AMILO A1655G
 27 */
 28#define A1655_WIFI_COMMAND	0x10C5
 29#define A1655_WIFI_ON		0x25
 30#define A1655_WIFI_OFF		0x45
 31
 32static int amilo_a1655_rfkill_set_block(void *data, bool blocked)
 33{
 34	u8 param = blocked ? A1655_WIFI_OFF : A1655_WIFI_ON;
 35	int rc;
 36
 37	i8042_lock_chip();
 38	rc = i8042_command(&param, A1655_WIFI_COMMAND);
 39	i8042_unlock_chip();
 40	return rc;
 41}
 42
 43static const struct rfkill_ops amilo_a1655_rfkill_ops = {
 44	.set_block = amilo_a1655_rfkill_set_block
 45};
 46
 47/*
 48 * These values were obtained from disassembling the PM.exe program
 49 * installed in the Fujitsu-Siemens AMILO M 7440
 50 */
 51#define M7440_PORT1		0x118f
 52#define M7440_PORT2		0x118e
 53#define M7440_RADIO_ON1		0x12
 54#define M7440_RADIO_ON2		0x80
 55#define M7440_RADIO_OFF1	0x10
 56#define M7440_RADIO_OFF2	0x00
 57
 58static int amilo_m7440_rfkill_set_block(void *data, bool blocked)
 59{
 60	u8 val1 = blocked ? M7440_RADIO_OFF1 : M7440_RADIO_ON1;
 61	u8 val2 = blocked ? M7440_RADIO_OFF2 : M7440_RADIO_ON2;
 62
 63	outb(val1, M7440_PORT1);
 64	outb(val2, M7440_PORT2);
 65
 66	/* Check whether the state has changed correctly */
 67	if (inb(M7440_PORT1) != val1 || inb(M7440_PORT2) != val2)
 68		return -EIO;
 69
 70	return 0;
 71}
 72
 73static const struct rfkill_ops amilo_m7440_rfkill_ops = {
 74	.set_block = amilo_m7440_rfkill_set_block
 75};
 76
 77static const struct dmi_system_id amilo_rfkill_id_table[] = {
 78	{
 79		.matches = {
 80			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 81			DMI_MATCH(DMI_BOARD_NAME, "AMILO A1655"),
 82		},
 83		.driver_data = (void *)&amilo_a1655_rfkill_ops
 84	},
 85	{
 86		.matches = {
 87			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 88			DMI_MATCH(DMI_BOARD_NAME, "AMILO L1310"),
 89		},
 90		.driver_data = (void *)&amilo_a1655_rfkill_ops
 91	},
 92	{
 93		.matches = {
 94			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 95			DMI_MATCH(DMI_BOARD_NAME, "AMILO M7440"),
 96		},
 97		.driver_data = (void *)&amilo_m7440_rfkill_ops
 98	},
 99	{}
100};
101
102static struct platform_device *amilo_rfkill_pdev;
103static struct rfkill *amilo_rfkill_dev;
104
105static int amilo_rfkill_probe(struct platform_device *device)
106{
107	int rc;
108	const struct dmi_system_id *system_id =
109		dmi_first_match(amilo_rfkill_id_table);
110
111	if (!system_id)
112		return -ENXIO;
113
114	amilo_rfkill_dev = rfkill_alloc(KBUILD_MODNAME, &device->dev,
115					RFKILL_TYPE_WLAN,
116					system_id->driver_data, NULL);
117	if (!amilo_rfkill_dev)
118		return -ENOMEM;
119
120	rc = rfkill_register(amilo_rfkill_dev);
121	if (rc)
122		goto fail;
123
124	return 0;
125
126fail:
127	rfkill_destroy(amilo_rfkill_dev);
128	return rc;
129}
130
131static int amilo_rfkill_remove(struct platform_device *device)
132{
133	rfkill_unregister(amilo_rfkill_dev);
134	rfkill_destroy(amilo_rfkill_dev);
135	return 0;
136}
137
138static struct platform_driver amilo_rfkill_driver = {
139	.driver = {
140		.name	= KBUILD_MODNAME,
141	},
142	.probe	= amilo_rfkill_probe,
143	.remove	= amilo_rfkill_remove,
144};
145
146static int __init amilo_rfkill_init(void)
147{
148	int rc;
149
150	if (dmi_first_match(amilo_rfkill_id_table) == NULL)
151		return -ENODEV;
152
153	rc = platform_driver_register(&amilo_rfkill_driver);
154	if (rc)
155		return rc;
156
157	amilo_rfkill_pdev = platform_device_register_simple(KBUILD_MODNAME, -1,
158							    NULL, 0);
159	if (IS_ERR(amilo_rfkill_pdev)) {
160		rc = PTR_ERR(amilo_rfkill_pdev);
161		goto fail;
162	}
163
164	return 0;
165
166fail:
167	platform_driver_unregister(&amilo_rfkill_driver);
168	return rc;
169}
170
171static void __exit amilo_rfkill_exit(void)
172{
173	platform_device_unregister(amilo_rfkill_pdev);
174	platform_driver_unregister(&amilo_rfkill_driver);
175}
176
177MODULE_AUTHOR("Ben Hutchings <ben@decadent.org.uk>");
178MODULE_LICENSE("GPL");
179MODULE_DEVICE_TABLE(dmi, amilo_rfkill_id_table);
180
181module_init(amilo_rfkill_init);
182module_exit(amilo_rfkill_exit);