xref: /linux/drivers/platform/x86/amilo-rfkill.c (revision 7a08cb9b4bb92fb86f5fe8a3aa0ac08a9b3d783b)
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 
28 static 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 
39 static 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 
54 static 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 
69 static const struct rfkill_ops amilo_m7440_rfkill_ops = {
70 	.set_block = amilo_m7440_rfkill_set_block
71 };
72 
73 static 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 
98 static struct platform_device *amilo_rfkill_pdev;
99 static struct rfkill *amilo_rfkill_dev;
100 
101 static 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 
122 fail:
123 	rfkill_destroy(amilo_rfkill_dev);
124 	return rc;
125 }
126 
127 static void amilo_rfkill_remove(struct platform_device *device)
128 {
129 	rfkill_unregister(amilo_rfkill_dev);
130 	rfkill_destroy(amilo_rfkill_dev);
131 }
132 
133 static 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 
141 static 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 
162 fail:
163 	platform_driver_unregister(&amilo_rfkill_driver);
164 	return rc;
165 }
166 
167 static void __exit amilo_rfkill_exit(void)
168 {
169 	platform_device_unregister(amilo_rfkill_pdev);
170 	platform_driver_unregister(&amilo_rfkill_driver);
171 }
172 
173 MODULE_AUTHOR("Ben Hutchings <ben@decadent.org.uk>");
174 MODULE_DESCRIPTION("Fujitsu-Siemens Amilo rfkill support");
175 MODULE_LICENSE("GPL");
176 MODULE_DEVICE_TABLE(dmi, amilo_rfkill_id_table);
177 
178 module_init(amilo_rfkill_init);
179 module_exit(amilo_rfkill_exit);
180