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 
32 static 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 
43 static 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 
58 static 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 
73 static const struct rfkill_ops amilo_m7440_rfkill_ops = {
74 	.set_block = amilo_m7440_rfkill_set_block
75 };
76 
77 static 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 
102 static struct platform_device *amilo_rfkill_pdev;
103 static struct rfkill *amilo_rfkill_dev;
104 
105 static 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 
126 fail:
127 	rfkill_destroy(amilo_rfkill_dev);
128 	return rc;
129 }
130 
131 static 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 
138 static 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 
146 static 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 
166 fail:
167 	platform_driver_unregister(&amilo_rfkill_driver);
168 	return rc;
169 }
170 
171 static void __exit amilo_rfkill_exit(void)
172 {
173 	platform_device_unregister(amilo_rfkill_pdev);
174 	platform_driver_unregister(&amilo_rfkill_driver);
175 }
176 
177 MODULE_AUTHOR("Ben Hutchings <ben@decadent.org.uk>");
178 MODULE_LICENSE("GPL");
179 MODULE_DEVICE_TABLE(dmi, amilo_rfkill_id_table);
180 
181 module_init(amilo_rfkill_init);
182 module_exit(amilo_rfkill_exit);
183