1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Support for rfkill on some Fujitsu-Siemens Amilo laptops.
  4 * Copyright 2011 Ben Hutchings.
  5 *
  6 * Based in part on the fsam7440 driver, which is:
  7 * Copyright 2005 Alejandro Vidal Mata & Javier Vidal Mata.
  8 * and on the fsaa1655g driver, which is:
  9 * Copyright 2006 Martin Večeřa.
 10 */
 11
 12#include <linux/module.h>
 13#include <linux/dmi.h>
 14#include <linux/i8042.h>
 15#include <linux/io.h>
 16#include <linux/moduleparam.h>
 17#include <linux/platform_device.h>
 18#include <linux/rfkill.h>
 19
 20/*
 21 * These values were obtained from disassembling and debugging the
 22 * PM.exe program installed in the Fujitsu-Siemens AMILO A1655G
 23 */
 24#define A1655_WIFI_COMMAND	0x10C5
 25#define A1655_WIFI_ON		0x25
 26#define A1655_WIFI_OFF		0x45
 27
 28static int amilo_a1655_rfkill_set_block(void *data, bool blocked)
 29{
 30	u8 param = blocked ? A1655_WIFI_OFF : A1655_WIFI_ON;
 31	int rc;
 32
 33	i8042_lock_chip();
 34	rc = i8042_command(&param, A1655_WIFI_COMMAND);
 35	i8042_unlock_chip();
 36	return rc;
 37}
 38
 39static const struct rfkill_ops amilo_a1655_rfkill_ops = {
 40	.set_block = amilo_a1655_rfkill_set_block
 41};
 42
 43/*
 44 * These values were obtained from disassembling the PM.exe program
 45 * installed in the Fujitsu-Siemens AMILO M 7440
 46 */
 47#define M7440_PORT1		0x118f
 48#define M7440_PORT2		0x118e
 49#define M7440_RADIO_ON1		0x12
 50#define M7440_RADIO_ON2		0x80
 51#define M7440_RADIO_OFF1	0x10
 52#define M7440_RADIO_OFF2	0x00
 53
 54static int amilo_m7440_rfkill_set_block(void *data, bool blocked)
 55{
 56	u8 val1 = blocked ? M7440_RADIO_OFF1 : M7440_RADIO_ON1;
 57	u8 val2 = blocked ? M7440_RADIO_OFF2 : M7440_RADIO_ON2;
 58
 59	outb(val1, M7440_PORT1);
 60	outb(val2, M7440_PORT2);
 61
 62	/* Check whether the state has changed correctly */
 63	if (inb(M7440_PORT1) != val1 || inb(M7440_PORT2) != val2)
 64		return -EIO;
 65
 66	return 0;
 67}
 68
 69static const struct rfkill_ops amilo_m7440_rfkill_ops = {
 70	.set_block = amilo_m7440_rfkill_set_block
 71};
 72
 73static const struct dmi_system_id amilo_rfkill_id_table[] = {
 74	{
 75		.matches = {
 76			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 77			DMI_MATCH(DMI_BOARD_NAME, "AMILO A1655"),
 78		},
 79		.driver_data = (void *)&amilo_a1655_rfkill_ops
 80	},
 81	{
 82		.matches = {
 83			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 84			DMI_MATCH(DMI_BOARD_NAME, "AMILO L1310"),
 85		},
 86		.driver_data = (void *)&amilo_a1655_rfkill_ops
 87	},
 88	{
 89		.matches = {
 90			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
 91			DMI_MATCH(DMI_BOARD_NAME, "AMILO M7440"),
 92		},
 93		.driver_data = (void *)&amilo_m7440_rfkill_ops
 94	},
 95	{}
 96};
 97
 98static struct platform_device *amilo_rfkill_pdev;
 99static struct rfkill *amilo_rfkill_dev;
100
101static int amilo_rfkill_probe(struct platform_device *device)
102{
103	int rc;
104	const struct dmi_system_id *system_id =
105		dmi_first_match(amilo_rfkill_id_table);
106
107	if (!system_id)
108		return -ENXIO;
109
110	amilo_rfkill_dev = rfkill_alloc(KBUILD_MODNAME, &device->dev,
111					RFKILL_TYPE_WLAN,
112					system_id->driver_data, NULL);
113	if (!amilo_rfkill_dev)
114		return -ENOMEM;
115
116	rc = rfkill_register(amilo_rfkill_dev);
117	if (rc)
118		goto fail;
119
120	return 0;
121
122fail:
123	rfkill_destroy(amilo_rfkill_dev);
124	return rc;
125}
126
127static void amilo_rfkill_remove(struct platform_device *device)
128{
129	rfkill_unregister(amilo_rfkill_dev);
130	rfkill_destroy(amilo_rfkill_dev);
131}
132
133static struct platform_driver amilo_rfkill_driver = {
134	.driver = {
135		.name	= KBUILD_MODNAME,
136	},
137	.probe	= amilo_rfkill_probe,
138	.remove_new = amilo_rfkill_remove,
139};
140
141static int __init amilo_rfkill_init(void)
142{
143	int rc;
144
145	if (dmi_first_match(amilo_rfkill_id_table) == NULL)
146		return -ENODEV;
147
148	rc = platform_driver_register(&amilo_rfkill_driver);
149	if (rc)
150		return rc;
151
152	amilo_rfkill_pdev = platform_device_register_simple(KBUILD_MODNAME,
153							    PLATFORM_DEVID_NONE,
154							    NULL, 0);
155	if (IS_ERR(amilo_rfkill_pdev)) {
156		rc = PTR_ERR(amilo_rfkill_pdev);
157		goto fail;
158	}
159
160	return 0;
161
162fail:
163	platform_driver_unregister(&amilo_rfkill_driver);
164	return rc;
165}
166
167static void __exit amilo_rfkill_exit(void)
168{
169	platform_device_unregister(amilo_rfkill_pdev);
170	platform_driver_unregister(&amilo_rfkill_driver);
171}
172
173MODULE_AUTHOR("Ben Hutchings <ben@decadent.org.uk>");
174MODULE_LICENSE("GPL");
175MODULE_DEVICE_TABLE(dmi, amilo_rfkill_id_table);
176
177module_init(amilo_rfkill_init);
178module_exit(amilo_rfkill_exit);