GNU Linux-libre 4.9.328-gnu1
[releases.git] / drivers / platform / x86 / amilo-rfkill.c
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);