284 lines
6.6 KiB
C
284 lines
6.6 KiB
C
/*
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* HP Compaq TC1100 Tablet WMI Extras Driver
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*
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* Copyright (C) 2007 Carlos Corbacho <carlos@strangeworlds.co.uk>
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* Copyright (C) 2004 Jamey Hicks <jamey.hicks@hp.com>
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <acpi/acpi.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#include <linux/platform_device.h>
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#define GUID "C364AC71-36DB-495A-8494-B439D472A505"
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#define TC1100_INSTANCE_WIRELESS 1
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#define TC1100_INSTANCE_JOGDIAL 2
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MODULE_AUTHOR("Jamey Hicks, Carlos Corbacho");
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MODULE_DESCRIPTION("HP Compaq TC1100 Tablet WMI Extras");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("wmi:C364AC71-36DB-495A-8494-B439D472A505");
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static struct platform_device *tc1100_device;
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struct tc1100_data {
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u32 wireless;
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u32 jogdial;
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};
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static struct tc1100_data suspend_data;
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/* --------------------------------------------------------------------------
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Device Management
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-------------------------------------------------------------------------- */
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static int get_state(u32 *out, u8 instance)
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{
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u32 tmp;
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acpi_status status;
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struct acpi_buffer result = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *obj;
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if (!out)
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return -EINVAL;
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if (instance > 2)
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return -ENODEV;
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status = wmi_query_block(GUID, instance, &result);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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obj = (union acpi_object *) result.pointer;
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if (obj && obj->type == ACPI_TYPE_INTEGER) {
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tmp = obj->integer.value;
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} else {
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tmp = 0;
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}
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if (result.length > 0 && result.pointer)
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kfree(result.pointer);
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switch (instance) {
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case TC1100_INSTANCE_WIRELESS:
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*out = (tmp == 3) ? 1 : 0;
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return 0;
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case TC1100_INSTANCE_JOGDIAL:
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*out = (tmp == 1) ? 0 : 1;
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return 0;
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default:
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return -ENODEV;
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}
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}
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static int set_state(u32 *in, u8 instance)
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{
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u32 value;
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acpi_status status;
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struct acpi_buffer input;
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if (!in)
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return -EINVAL;
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if (instance > 2)
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return -ENODEV;
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switch (instance) {
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case TC1100_INSTANCE_WIRELESS:
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value = (*in) ? 1 : 2;
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break;
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case TC1100_INSTANCE_JOGDIAL:
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value = (*in) ? 0 : 1;
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break;
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default:
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return -ENODEV;
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}
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input.length = sizeof(u32);
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input.pointer = &value;
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status = wmi_set_block(GUID, instance, &input);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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return 0;
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}
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/* --------------------------------------------------------------------------
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FS Interface (/sys)
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-------------------------------------------------------------------------- */
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/*
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* Read/ write bool sysfs macro
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*/
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#define show_set_bool(value, instance) \
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static ssize_t \
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show_bool_##value(struct device *dev, struct device_attribute *attr, \
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char *buf) \
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{ \
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u32 result; \
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acpi_status status = get_state(&result, instance); \
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if (ACPI_SUCCESS(status)) \
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return sprintf(buf, "%d\n", result); \
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return sprintf(buf, "Read error\n"); \
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} \
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\
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static ssize_t \
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set_bool_##value(struct device *dev, struct device_attribute *attr, \
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const char *buf, size_t count) \
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{ \
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u32 tmp = simple_strtoul(buf, NULL, 10); \
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acpi_status status = set_state(&tmp, instance); \
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if (ACPI_FAILURE(status)) \
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return -EINVAL; \
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return count; \
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} \
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static DEVICE_ATTR(value, S_IRUGO | S_IWUSR, \
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show_bool_##value, set_bool_##value);
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show_set_bool(wireless, TC1100_INSTANCE_WIRELESS);
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show_set_bool(jogdial, TC1100_INSTANCE_JOGDIAL);
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static struct attribute *tc1100_attributes[] = {
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&dev_attr_wireless.attr,
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&dev_attr_jogdial.attr,
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NULL
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};
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static struct attribute_group tc1100_attribute_group = {
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.attrs = tc1100_attributes,
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};
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/* --------------------------------------------------------------------------
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Driver Model
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-------------------------------------------------------------------------- */
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static int __init tc1100_probe(struct platform_device *device)
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{
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return sysfs_create_group(&device->dev.kobj, &tc1100_attribute_group);
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}
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static int __devexit tc1100_remove(struct platform_device *device)
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{
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sysfs_remove_group(&device->dev.kobj, &tc1100_attribute_group);
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return 0;
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}
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#ifdef CONFIG_PM
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static int tc1100_suspend(struct device *dev)
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{
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int ret;
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ret = get_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
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if (ret)
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return ret;
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ret = get_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
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if (ret)
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return ret;
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return 0;
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}
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static int tc1100_resume(struct device *dev)
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{
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int ret;
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ret = set_state(&suspend_data.wireless, TC1100_INSTANCE_WIRELESS);
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if (ret)
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return ret;
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ret = set_state(&suspend_data.jogdial, TC1100_INSTANCE_JOGDIAL);
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if (ret)
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return ret;
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return 0;
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}
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static const struct dev_pm_ops tc1100_pm_ops = {
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.suspend = tc1100_suspend,
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.resume = tc1100_resume,
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.freeze = tc1100_suspend,
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.restore = tc1100_resume,
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};
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#endif
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static struct platform_driver tc1100_driver = {
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.driver = {
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.name = "tc1100-wmi",
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.owner = THIS_MODULE,
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#ifdef CONFIG_PM
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.pm = &tc1100_pm_ops,
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#endif
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},
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.remove = __devexit_p(tc1100_remove),
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};
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static int __init tc1100_init(void)
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{
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int error;
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if (!wmi_has_guid(GUID))
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return -ENODEV;
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tc1100_device = platform_device_alloc("tc1100-wmi", -1);
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if (!tc1100_device)
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return -ENOMEM;
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error = platform_device_add(tc1100_device);
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if (error)
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goto err_device_put;
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error = platform_driver_probe(&tc1100_driver, tc1100_probe);
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if (error)
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goto err_device_del;
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pr_info("HP Compaq TC1100 Tablet WMI Extras loaded\n");
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return 0;
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err_device_del:
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platform_device_del(tc1100_device);
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err_device_put:
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platform_device_put(tc1100_device);
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return error;
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}
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static void __exit tc1100_exit(void)
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{
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platform_device_unregister(tc1100_device);
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platform_driver_unregister(&tc1100_driver);
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}
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module_init(tc1100_init);
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module_exit(tc1100_exit);
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