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 M7440"),
  89                 },
  90                 .driver_data = (void *)&amilo_m7440_rfkill_ops
  91         },
  92         {}
  93 };
  94
  95 static struct platform_device *amilo_rfkill_pdev;
  96 static struct rfkill *amilo_rfkill_dev;
  97
  98 static int amilo_rfkill_probe(struct platform_device *device)
  99 {
 100         int rc;
 101         const struct dmi_system_id *system_id =
 102                 dmi_first_match(amilo_rfkill_id_table);
 103
 104         if (!system_id)
 105                 return -ENXIO;
 106
 107         amilo_rfkill_dev = rfkill_alloc(KBUILD_MODNAME, &device->dev,
 108                                         RFKILL_TYPE_WLAN,
 109                                         system_id->driver_data, NULL);
 110         if (!amilo_rfkill_dev)
 111                 return -ENOMEM;
 112
 113         rc = rfkill_register(amilo_rfkill_dev);
 114         if (rc)
 115                 goto fail;
 116
 117         return 0;
 118
 119 fail:
 120         rfkill_destroy(amilo_rfkill_dev);
 121         return rc;
 122 }
 123
 124 static int amilo_rfkill_remove(struct platform_device *device)
 125 {
 126         rfkill_unregister(amilo_rfkill_dev);
 127         rfkill_destroy(amilo_rfkill_dev);
 128         return 0;
 129 }
 130
 131 static struct platform_driver amilo_rfkill_driver = {
 132         .driver = {
 133                 .name   = KBUILD_MODNAME,
 134                 .owner  = THIS_MODULE,
 135         },
 136         .probe  = amilo_rfkill_probe,
 137         .remove = amilo_rfkill_remove,
 138 };
 139
 140 static int __init amilo_rfkill_init(void)
 141 {
 142         int rc;
 143
 144         if (dmi_first_match(amilo_rfkill_id_table) == NULL)
 145                 return -ENODEV;
 146
 147         rc = platform_driver_register(&amilo_rfkill_driver);
 148         if (rc)
 149                 return rc;
 150
 151         amilo_rfkill_pdev = platform_device_register_simple(KBUILD_MODNAME, -1,
 152                                                             NULL, 0);
 153         if (IS_ERR(amilo_rfkill_pdev)) {
 154                 rc = PTR_ERR(amilo_rfkill_pdev);
 155                 goto fail;
 156         }
 157
 158         return 0;
 159
 160 fail:
 161         platform_driver_unregister(&amilo_rfkill_driver);
 162         return rc;
 163 }
 164
 165 static void __exit amilo_rfkill_exit(void)
 166 {
 167         platform_device_unregister(amilo_rfkill_pdev);
 168         platform_driver_unregister(&amilo_rfkill_driver);
 169 }
 170
 171 MODULE_AUTHOR("Ben Hutchings <ben@decadent.org.uk>");
 172 MODULE_LICENSE("GPL");
 173 MODULE_DEVICE_TABLE(dmi, amilo_rfkill_id_table);
 174
 175 module_init(amilo_rfkill_init);
 176 module_exit(amilo_rfkill_exit);