--- /dev/null
+/*
+ * 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.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/acpi.h>
+#include <linux/platform_device.h>
+
+#define GUID "C364AC71-36DB-495A-8494-B439D472A505"
+
+#define TC1100_INSTANCE_WIRELESS 1
+#define TC1100_INSTANCE_JOGDIAL 2
+
+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 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_INTEGER) {
+ tmp = obj->integer.value;
+ } 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) ? 0 : 1;
+ 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_IRUGO | S_IWUSR, \
+ show_bool_##value, set_bool_##value);
+
+show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
+show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
+
+static struct attribute *tc1100_attributes[] = {
+ &dev_attr_wireless.attr,
+ &dev_attr_jogdial.attr,
+ NULL
+};
+
+static struct attribute_group tc1100_attribute_group = {
+ .attrs = tc1100_attributes,
+};
+
+/* --------------------------------------------------------------------------
+ Driver Model
+ -------------------------------------------------------------------------- */
+
+static int __init tc1100_probe(struct platform_device *device)
+{
+ return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
+}
+
+
+static int tc1100_remove(struct platform_device *device)
+{
+ sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int tc1100_suspend(struct device *dev)
+{
+ 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 0;
+}
+
+static int tc1100_resume(struct 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 0;
+}
+
+static const struct dev_pm_ops tc1100_pm_ops = {
+ .suspend = tc1100_suspend,
+ .resume = tc1100_resume,
+ .freeze = tc1100_suspend,
+ .restore = tc1100_resume,
+};
+#endif
+
+static struct platform_driver tc1100_driver = {
+ .driver = {
+ .name = "tc1100-wmi",
+#ifdef CONFIG_PM
+ .pm = &tc1100_pm_ops,
+#endif
+ },
+ .remove = tc1100_remove,
+};
+
+static int __init tc1100_init(void)
+{
+ int error;
+
+ if (!wmi_has_guid(GUID))
+ return -ENODEV;
+
+ tc1100_device = platform_device_alloc("tc1100-wmi", -1);
+ if (!tc1100_device)
+ return -ENOMEM;
+
+ error = platform_device_add(tc1100_device);
+ if (error)
+ goto err_device_put;
+
+ error = platform_driver_probe(&tc1100_driver, tc1100_probe);
+ if (error)
+ goto err_device_del;
+
+ pr_info("HP Compaq TC1100 Tablet WMI Extras loaded\n");
+ return 0;
+
+ err_device_del:
+ platform_device_del(tc1100_device);
+ err_device_put:
+ platform_device_put(tc1100_device);
+ return error;
+}
+
+static void __exit tc1100_exit(void)
+{
+ platform_device_unregister(tc1100_device);
+ platform_driver_unregister(&tc1100_driver);
+}
+
+module_init(tc1100_init);
+module_exit(tc1100_exit);
Code Review / kvmfornfv.git / blobdiff