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
  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 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
 134 static 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
 142 static 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
 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_LICENSE("GPL");
 175 MODULE_DEVICE_TABLE(dmi, amilo_rfkill_id_table);
 176
 177 module_init(amilo_rfkill_init);
 178 module_exit(amilo_rfkill_exit);