LXR 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
  32static 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
  43static 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
  58static 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
  73static const struct rfkill_ops amilo_m7440_rfkill_ops = {
  74        .set_block = amilo_m7440_rfkill_set_block
  75};
  76
  77static const struct dmi_system_id __devinitconst 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
  95static struct platform_device *amilo_rfkill_pdev;
  96static struct rfkill *amilo_rfkill_dev;
  97
  98static int __devinit 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
 119fail:
 120        rfkill_destroy(amilo_rfkill_dev);
 121        return rc;
 122}
 123
 124static 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
 131static 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
 140static 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
 160fail:
 161        platform_driver_unregister(&amilo_rfkill_driver);
 162        return rc;
 163}
 164
 165static void __exit amilo_rfkill_exit(void)
 166{
 167        platform_device_unregister(amilo_rfkill_pdev);
 168        platform_driver_unregister(&amilo_rfkill_driver);
 169}
 170
 171MODULE_AUTHOR("Ben Hutchings <ben@decadent.org.uk>");
 172MODULE_LICENSE("GPL");
 173MODULE_DEVICE_TABLE(dmi, amilo_rfkill_id_table);
 174
 175module_init(amilo_rfkill_init);
 176module_exit(amilo_rfkill_exit);
 177