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Linux/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                 .owner  = THIS_MODULE,
142         },
143         .probe  = amilo_rfkill_probe,
144         .remove = amilo_rfkill_remove,
145 };
146 
147 static int __init amilo_rfkill_init(void)
148 {
149         int rc;
150 
151         if (dmi_first_match(amilo_rfkill_id_table) == NULL)
152                 return -ENODEV;
153 
154         rc = platform_driver_register(&amilo_rfkill_driver);
155         if (rc)
156                 return rc;
157 
158         amilo_rfkill_pdev = platform_device_register_simple(KBUILD_MODNAME, -1,
159                                                             NULL, 0);
160         if (IS_ERR(amilo_rfkill_pdev)) {
161                 rc = PTR_ERR(amilo_rfkill_pdev);
162                 goto fail;
163         }
164 
165         return 0;
166 
167 fail:
168         platform_driver_unregister(&amilo_rfkill_driver);
169         return rc;
170 }
171 
172 static void __exit amilo_rfkill_exit(void)
173 {
174         platform_device_unregister(amilo_rfkill_pdev);
175         platform_driver_unregister(&amilo_rfkill_driver);
176 }
177 
178 MODULE_AUTHOR("Ben Hutchings <ben@decadent.org.uk>");
179 MODULE_LICENSE("GPL");
180 MODULE_DEVICE_TABLE(dmi, amilo_rfkill_id_table);
181 
182 module_init(amilo_rfkill_init);
183 module_exit(amilo_rfkill_exit);
184 

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