tc1100-wmi: Add driver for HP Compaq TC1100 Tablets

This is based on the 2004 out-of-tree work of Jamey Hicks, to add
support via WMI for controlling the jog dial and wireless on these
tablets.

v1:

Original release

v2:

As per Joshua Wise's comments, change bluetooth to jogdial (an error from
the original driver).

Signed-off-by: Carlos Corbacho <carlos@strangeworlds.co.uk>
CC: Matthew Garrett <mjg59@srcf.ucam.org>
CC: Jamey Hicks <jamey.hicks@nokia.com>
CC: Joshua Wise <joshua@joshuawise.com>
Signed-off-by: Len Brown <len.brown@intel.com>

3 files changed, 300 insertions, 0 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 35d2c22c5d24..05997411bc48 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -142,6 +142,15 @@ config FUJITSU_LAPTOP
 
           If you have a Fujitsu laptop, say Y or M here.
 
+config TC1100_WMI
+        tristate "HP Compaq TC1100 Tablet WMI Extras"
+        depends on X86 && !X86_64
+        depends on ACPI
+        depends on ACPI_WMI
+        ---help---
+          This is a driver for the WMI extensions (wireless and bluetooth power
+          control) of the HP Compaq TC1100 tablet.
+
 config MSI_LAPTOP
         tristate "MSI Laptop Extras"
         depends on X86
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 3da1491f662c..51196c09e25b 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_MSI_LAPTOP)     += msi-laptop.o
 obj-$(CONFIG_ACER_WMI)     += acer-wmi.o
 obj-$(CONFIG_ASUS_LAPTOP)     += asus-laptop.o
 obj-$(CONFIG_ATMEL_SSC)         += atmel-ssc.o
+obj-$(CONFIG_TC1100_WMI)        += tc1100-wmi.o
 obj-$(CONFIG_LKDTM)             += lkdtm.o
 obj-$(CONFIG_TIFM_CORE)         += tifm_core.o
 obj-$(CONFIG_TIFM_7XX1)         += tifm_7xx1.o
diff --git a/drivers/misc/tc1100-wmi.c b/drivers/misc/tc1100-wmi.c
new file mode 100644
index 000000000000..f25e4c974dcf
--- /dev/null
+++ b/drivers/misc/tc1100-wmi.c
@@ -0,0 +1,290 @@
+/*
+ *  HP Compaq TC1100 Tablet WMI Extras Driver
+ *
+ *  Copyright (C) 2007 Carlos Corbacho <carlos@strangeworlds.co.uk>
+ *  Copyright (C) 2004 Jamey Hicks <jamey.hicks@hp.com>
+ *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  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.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <acpi/acpi.h>
+#include <acpi/actypes.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+#include <linux/platform_device.h>
+
+#define GUID "C364AC71-36DB-495A-8494-B439D472A505"
+
+#define TC1100_INSTANCE_WIRELESS                1
+#define TC1100_INSTANCE_JOGDIAL         2
+
+#define TC1100_LOGPREFIX "tc1100-wmi: "
+#define TC1100_INFO KERN_INFO TC1100_LOGPREFIX
+
+MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
+MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
+
+static int tc1100_probe(struct platform_device *device);
+static int tc1100_remove(struct platform_device *device);
+static int tc1100_suspend(struct platform_device *device, pm_message_t state);
+static int tc1100_resume(struct platform_device *device);
+
+static struct platform_driver tc1100_driver = {
+        .driver = {
+                .name = "tc1100-wmi",
+                .owner = THIS_MODULE,
+        },
+        .probe = tc1100_probe,
+        .remove = tc1100_remove,
+        .suspend = tc1100_suspend,
+        .resume = tc1100_resume,
+};
+
+static struct platform_device *tc1100_device;
+
+struct tc1100_data {
+        u32 wireless;
+        u32 jogdial;
+};
+
+static struct tc1100_data suspend_data;
+
+/* --------------------------------------------------------------------------
+                                Device Management
+   -------------------------------------------------------------------------- */
+
+static int get_state(u32 *out, u8 instance)
+{
+        u32 tmp;
+        acpi_status status;
+        struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
+        union acpi_object *obj;
+
+        if (!out)
+                return -EINVAL;
+
+        if (instance > 2)
+                return -ENODEV;
+
+        status = wmi_query_block(GUID, instance, &result);
+        if (ACPI_FAILURE(status))
+                return -ENODEV;
+
+        obj = (union acpi_object *) result.pointer;
+        if (obj && obj->type == ACPI_TYPE_BUFFER &&
+                obj->buffer.length == sizeof(u32)) {
+                tmp = *((u32 *) obj->buffer.pointer);
+        } else {
+                tmp = 0;
+        }
+
+        if (result.length > 0 && result.pointer)
+                kfree(result.pointer);
+
+        switch (instance) {
+        case TC1100_INSTANCE_WIRELESS:
+                *out = (tmp == 3) ? 1 : 0;
+                return 0;
+        case TC1100_INSTANCE_JOGDIAL:
+                *out = (tmp == 1) ? 1 : 0;
+                return 0;
+        default:
+                return -ENODEV;
+        }
+}
+
+static int set_state(u32 *in, u8 instance)
+{
+        u32 value;
+        acpi_status status;
+        struct acpi_buffer input;
+
+        if (!in)
+                return -EINVAL;
+
+        if (instance > 2)
+                return -ENODEV;
+
+        switch (instance) {
+        case TC1100_INSTANCE_WIRELESS:
+                value = (*in) ? 1 : 2;
+                break;
+        case TC1100_INSTANCE_JOGDIAL:
+                value = (*in) ? 0 : 1;
+                break;
+        default:
+                return -ENODEV;
+        }
+
+        input.length = sizeof(u32);
+        input.pointer = &value;
+
+        status = wmi_set_block(GUID, instance, &input);
+        if (ACPI_FAILURE(status))
+                return -ENODEV;
+
+        return 0;
+}
+
+/* --------------------------------------------------------------------------
+                                FS Interface (/sys)
+   -------------------------------------------------------------------------- */
+
+/*
+ * Read/ write bool sysfs macro
+ */
+#define show_set_bool(value, instance) \
+static ssize_t \
+show_bool_##value(struct device *dev, struct device_attribute *attr, \
+        char *buf) \
+{ \
+        u32 result; \
+        acpi_status status = get_state(&result, instance); \
+        if (ACPI_SUCCESS(status)) \
+                return sprintf(buf, "%d\n", result); \
+        return sprintf(buf, "Read error\n"); \
+} \
+\
+static ssize_t \
+set_bool_##value(struct device *dev, struct device_attribute *attr, \
+        const char *buf, size_t count) \
+{ \
+        u32 tmp = simple_strtoul(buf, NULL, 10); \
+        acpi_status status = set_state(&tmp, instance); \
+                if (ACPI_FAILURE(status)) \
+                        return -EINVAL; \
+        return count; \
+} \
+static DEVICE_ATTR(value, S_IWUGO | S_IRUGO | S_IWUSR, \
+        show_bool_##value, set_bool_##value);
+
+show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
+show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
+
+static void remove_fs(void)
+{
+        device_remove_file(&tc1100_device->dev, &dev_attr_wireless);
+        device_remove_file(&tc1100_device->dev, &dev_attr_jogdial);
+}
+
+static int add_fs(void)
+{
+        int ret;
+
+        ret = device_create_file(&tc1100_device->dev, &dev_attr_wireless);
+        if (ret)
+                goto add_sysfs_error;
+
+        ret = device_create_file(&tc1100_device->dev, &dev_attr_jogdial);
+        if (ret)
+                goto add_sysfs_error;
+
+        return ret;
+
+add_sysfs_error:
+        remove_fs();
+        return ret;
+}
+
+/* --------------------------------------------------------------------------
+                                Driver Model
+   -------------------------------------------------------------------------- */
+
+static int tc1100_probe(struct platform_device *device)
+{
+        int result = 0;
+
+        result = add_fs();
+        return result;
+}
+
+
+static int tc1100_remove(struct platform_device *device)
+{
+        remove_fs();
+        return 0;
+}
+
+static int tc1100_suspend(struct platform_device *dev, pm_message_t state)
+{
+        int ret;
+
+        ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
+        if (ret)
+                return ret;
+
+        ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
+        if (ret)
+                return ret;
+
+        return ret;
+}
+
+static int tc1100_resume(struct platform_device *dev)
+{
+        int ret;
+
+        ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
+        if (ret)
+                return ret;
+
+        ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
+        if (ret)
+                return ret;
+
+        return ret;
+}
+
+static int __init tc1100_init(void)
+{
+        int result = 0;
+
+        if (!wmi_has_guid(GUID))
+                return -ENODEV;
+
+        result = platform_driver_register(&tc1100_driver);
+        if (result)
+                return result;
+
+        tc1100_device = platform_device_alloc("tc1100-wmi", -1);
+        platform_device_add(tc1100_device);
+
+        printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras loaded\n");
+
+        return result;
+}
+
+static void __exit tc1100_exit(void)
+{
+        platform_device_del(tc1100_device);
+        platform_driver_unregister(&tc1100_driver);
+
+        printk(TC1100_INFO "HP Compaq TC1100 Tablet WMI Extras unloaded\n");
+}
+
+module_init(tc1100_init);
+module_exit(tc1100_exit);