x86: Add amilo-rfkill driver for some Fujitsu-Siemens Amilo laptops

An rfkill driver based on the fsaa1655g and fsam7440 drivers for
Fujitsu-Siemens Amilo A1655 and M7440 models found at:

http://sourceforge.net/projects/fsaa1655g/
http://sourceforge.net/projects/fsam7440/

This adds DMI matching, replaces the procfs files with rfkill devices,
and uses the proper functions to write to the i8042 safely.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

1 files changed, 173 insertions, 0 deletions

diff --git a/drivers/platform/x86/amilo-rfkill.c b/drivers/platform/x86/amilo-rfkill.c
new file mode 100644
index 00000000000..19170bb7700
--- /dev/null
+++ b/drivers/platform/x86/amilo-rfkill.c
@@ -0,0 +1,173 @@
+/*
+ * Support for rfkill on some Fujitsu-Siemens Amilo laptops.
+ * Copyright 2011 Ben Hutchings.
+ *
+ * Based in part on the fsam7440 driver, which is:
+ * Copyright 2005 Alejandro Vidal Mata & Javier Vidal Mata.
+ * and on the fsaa1655g driver, which is:
+ * Copyright 2006 Martin Večeřa.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/dmi.h>
+#include <linux/i8042.h>
+#include <linux/io.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+#include <linux/rfkill.h>
+
+/*
+ * These values were obtained from disassembling and debugging the
+ * PM.exe program installed in the Fujitsu-Siemens AMILO A1655G
+ */
+#define A1655_WIFI_COMMAND      0x10C5
+#define A1655_WIFI_ON           0x25
+#define A1655_WIFI_OFF          0x45
+
+static int amilo_a1655_rfkill_set_block(void *data, bool blocked)
+{
+        u8 param = blocked ? A1655_WIFI_OFF : A1655_WIFI_ON;
+        int rc;
+
+        i8042_lock_chip();
+        rc = i8042_command(&param, A1655_WIFI_COMMAND);
+        i8042_unlock_chip();
+        return rc;
+}
+
+static const struct rfkill_ops amilo_a1655_rfkill_ops = {
+        .set_block = amilo_a1655_rfkill_set_block
+};
+
+/*
+ * These values were obtained from disassembling the PM.exe program
+ * installed in the Fujitsu-Siemens AMILO M 7440
+ */
+#define M7440_PORT1             0x118f
+#define M7440_PORT2             0x118e
+#define M7440_RADIO_ON1         0x12
+#define M7440_RADIO_ON2         0x80
+#define M7440_RADIO_OFF1        0x10
+#define M7440_RADIO_OFF2        0x00
+
+static int amilo_m7440_rfkill_set_block(void *data, bool blocked)
+{
+        u8 val1 = blocked ? M7440_RADIO_OFF1 : M7440_RADIO_ON1;
+        u8 val2 = blocked ? M7440_RADIO_OFF2 : M7440_RADIO_ON2;
+
+        outb(val1, M7440_PORT1);
+        outb(val2, M7440_PORT2);
+
+        /* Check whether the state has changed correctly */
+        if (inb(M7440_PORT1) != val1 || inb(M7440_PORT2) != val2)
+                return -EIO;
+
+        return 0;
+}
+
+static const struct rfkill_ops amilo_m7440_rfkill_ops = {
+        .set_block = amilo_m7440_rfkill_set_block
+};
+
+static const struct dmi_system_id __devinitdata amilo_rfkill_id_table[] = {
+        {
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
+                        DMI_MATCH(DMI_BOARD_NAME, "AMILO A1655"),
+                },
+                .driver_data = (void *)&amilo_a1655_rfkill_ops
+        },
+        {
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
+                        DMI_MATCH(DMI_BOARD_NAME, "AMILO M7440"),
+                },
+                .driver_data = (void *)&amilo_m7440_rfkill_ops
+        },
+        {}
+};
+
+static struct platform_device *amilo_rfkill_pdev;
+static struct rfkill *amilo_rfkill_dev;
+
+static int __devinit amilo_rfkill_probe(struct platform_device *device)
+{
+        const struct dmi_system_id *system_id =
+                dmi_first_match(amilo_rfkill_id_table);
+        int rc;
+
+        amilo_rfkill_dev = rfkill_alloc(KBUILD_MODNAME, &device->dev,
+                                        RFKILL_TYPE_WLAN,
+                                        system_id->driver_data, NULL);
+        if (!amilo_rfkill_dev)
+                return -ENOMEM;
+
+        rc = rfkill_register(amilo_rfkill_dev);
+        if (rc)
+                goto fail;
+
+        return 0;
+
+fail:
+        rfkill_destroy(amilo_rfkill_dev);
+        return rc;
+}
+
+static int amilo_rfkill_remove(struct platform_device *device)
+{
+        rfkill_unregister(amilo_rfkill_dev);
+        rfkill_destroy(amilo_rfkill_dev);
+        return 0;
+}
+
+static struct platform_driver amilo_rfkill_driver = {
+        .driver = {
+                .name   = KBUILD_MODNAME,
+                .owner  = THIS_MODULE,
+        },
+        .probe  = amilo_rfkill_probe,
+        .remove = amilo_rfkill_remove,
+};
+
+static int __init amilo_rfkill_init(void)
+{
+        int rc;
+
+        if (dmi_first_match(amilo_rfkill_id_table) == NULL)
+                return -ENODEV;
+
+        rc = platform_driver_register(&amilo_rfkill_driver);
+        if (rc)
+                return rc;
+
+        amilo_rfkill_pdev = platform_device_register_simple(KBUILD_MODNAME, -1,
+                                                            NULL, 0);
+        if (IS_ERR(amilo_rfkill_pdev)) {
+                rc = PTR_ERR(amilo_rfkill_pdev);
+                goto fail;
+        }
+
+        return 0;
+
+fail:
+        platform_driver_unregister(&amilo_rfkill_driver);
+        return rc;
+}
+
+static void __exit amilo_rfkill_exit(void)
+{
+        platform_device_unregister(amilo_rfkill_pdev);
+        platform_driver_unregister(&amilo_rfkill_driver);
+}
+
+MODULE_AUTHOR("Ben Hutchings <ben@decadent.org.uk>");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(dmi, amilo_rfkill_id_table);
+
+module_init(amilo_rfkill_init);
+module_exit(amilo_rfkill_exit);