LXR linux/drivers/platform/x86/amilo-rfkill.c

   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
  28static 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
  39static 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
  54static 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
  69static const struct rfkill_ops amilo_m7440_rfkill_ops = {
  70        .set_block = amilo_m7440_rfkill_set_block
  71};
  72
  73static 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
  98static struct platform_device *amilo_rfkill_pdev;
  99static struct rfkill *amilo_rfkill_dev;
 100
 101static 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
 122fail:
 123        rfkill_destroy(amilo_rfkill_dev);
 124        return rc;
 125}
 126
 127static int amilo_rfkill_remove(struct platform_device *device)
 128{
 129        rfkill_unregister(amilo_rfkill_dev);
 130        rfkill_destroy(amilo_rfkill_dev);
 131        return 0;
 132}
 133
 134static struct platform_driver amilo_rfkill_driver = {
 135        .driver = {
 136                .name   = KBUILD_MODNAME,
 137        },
 138        .probe  = amilo_rfkill_probe,
 139        .remove = amilo_rfkill_remove,
 140};
 141
 142static int __init amilo_rfkill_init(void)
 143{
 144        int rc;
 145
 146        if (dmi_first_match(amilo_rfkill_id_table) == NULL)
 147                return -ENODEV;
 148
 149        rc = platform_driver_register(&amilo_rfkill_driver);
 150        if (rc)
 151                return rc;
 152
 153        amilo_rfkill_pdev = platform_device_register_simple(KBUILD_MODNAME, -1,
 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
 162fail:
 163        platform_driver_unregister(&amilo_rfkill_driver);
 164        return rc;
 165}
 166
 167static void __exit amilo_rfkill_exit(void)
 168{
 169        platform_device_unregister(amilo_rfkill_pdev);
 170        platform_driver_unregister(&amilo_rfkill_driver);
 171}
 172
 173MODULE_AUTHOR("Ben Hutchings <ben@decadent.org.uk>");
 174MODULE_LICENSE("GPL");
 175MODULE_DEVICE_TABLE(dmi, amilo_rfkill_id_table);
 176
 177module_init(amilo_rfkill_init);
 178module_exit(amilo_rfkill_exit);
 179