/*
* ideapad_acpi.c - Lenovo IdeaPad ACPI Extras
*
* Copyright © 2010 Intel Corporation
* Copyright © 2010 David Woodhouse <dwmw2@infradead.org>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <linux/rfkill.h>
#define IDEAPAD_DEV_CAMERA 0
#define IDEAPAD_DEV_WLAN 1
#define IDEAPAD_DEV_BLUETOOTH 2
#define IDEAPAD_DEV_3G 3
#define IDEAPAD_DEV_KILLSW 4
static struct rfkill *ideapad_rfkill[5];
static const char *ideapad_rfk_names[] = {
"ideapad_camera", "ideapad_wlan", "ideapad_bluetooth", "ideapad_3g", "ideapad_rfkill"
};
static const int ideapad_rfk_types[] = {
0, RFKILL_TYPE_WLAN, RFKILL_TYPE_BLUETOOTH, RFKILL_TYPE_WWAN, RFKILL_TYPE_WLAN
};
static int ideapad_dev_exists(int device)
{
acpi_status status;
union acpi_object in_param;
struct acpi_object_list input = { 1, &in_param };
struct acpi_buffer output;
union acpi_object out_obj;
output.length = sizeof(out_obj);
output.pointer = &out_obj;
in_param.type = ACPI_TYPE_INTEGER;
in_param.integer.value = device + 1;
status = acpi_evaluate_object(NULL, "\\_SB_.DECN", &input, &output);
if (ACPI_FAILURE(status)) {
printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method failed %d. Is this an IdeaPAD?\n", status);
return -ENODEV;
}
if (out_obj.type != ACPI_TYPE_INTEGER) {
printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method returned unexpected type\n");
return -ENODEV;
}
return out_obj.integer.value;
}
static int ideapad_dev_get_state(int device)
{
acpi_status status;
union acpi_object in_param;
struct acpi_object_list input = { 1, &in_param };
struct acpi_buffer output;
union acpi_object out_obj;
output.length = sizeof(out_obj);
output.pointer = &out_obj;
in_param.type = ACPI_TYPE_INTEGER;
in_param.integer.value = device + 1;
status = acpi_evaluate_object(NULL, "\\_SB_.GECN", &input, &output);
if (ACPI_FAILURE(status)) {
printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method failed %d\n", status);
return -ENODEV;
}
if (out_obj.type != ACPI_TYPE_INTEGER) {
printk(KERN_WARNING "IdeaPAD \\_SB_.GECN method returned unexpected type\n");
return -ENODEV;
}
return out_obj.integer.value;
}
static int ideapad_dev_set_state(int device, int state)
{
acpi_status status;
union acpi_object in_params[2];
struct acpi_object_list input = { 2, in_params };
in_params[0].type = ACPI_TYPE_INTEGER;
in_params[0].integer.value = device + 1;
in_params[1].type = ACPI_TYPE_INTEGER;
in_params[1].integer.value = state;
status = acpi_evaluate_object(NULL, "\\_SB_.SECN", &input, NULL);
if (ACPI_FAILURE(status)) {
printk(KERN_WARNING "IdeaPAD \\_SB_.SECN method failed %d\n", status);
return -ENODEV;
}
return 0;
}
static ssize_t show_ideapad_cam(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int state = ideapad_dev_get_state(IDEAPAD_DEV_CAMERA);
if (state < 0)
return state;
return sprintf(buf, "%d\n", state);
}
static ssize_t store_ideapad_cam(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int ret, state;
if (!count)
return 0;
if (sscanf(buf, "%i", &state) != 1)
return -EINVAL;
ret = ideapad_dev_set_state(IDEAPAD_DEV_CAMERA, state);
if (ret < 0)
return ret;
return count;
}
static DEVICE_ATTR(camera_power, 0644, show_ideapad_cam, store_ideapad_cam);
static int ideapad_rfk_set(void *data, bool blocked)
{
int device = (unsigned long)data;
if (device == IDEAPAD_DEV_KILLSW)
return -EINVAL;
return ideapad_dev_set_state(device, !blocked);
}
static struct rfkill_ops ideapad_rfk_ops = {
.set_block = ideapad_rfk_set,
};
static void ideapad_sync_rfk_state(void)
{
int hw_blocked = !ideapad_dev_get_state(IDEAPAD_DEV_KILLSW);
int i;
rfkill_set_hw_state(ideapad_rfkill[IDEAPAD_DEV_KILLSW], hw_blocked);
for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
if (ideapad_rfkill[i])
rfkill_set_hw_state(ideapad_rfkill[i], hw_blocked);
if (hw_blocked)
return;
for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++)
if (ideapad_rfkill[i])
rfkill_set_sw_state(ideapad_rfkill[i], !ideapad_dev_get_state(i));
}
static int ideapad_register_rfkill(struct acpi_device *device, int dev)
{
int ret;
ideapad_rfkill[dev] = rfkill_alloc(ideapad_rfk_names[dev], &device->dev,
ideapad_rfk_types[dev], &ideapad_rfk_ops,
(void *)(long)dev);
if (!ideapad_rfkill[dev])
return -ENOMEM;
ret = rfkill_register(ideapad_rfkill[dev]);
if (ret) {
rfkill_destroy(ideapad_rfkill[dev]);
return ret;
}
return 0;
}
static void ideapad_unregister_rfkill(int dev)
{
if (!ideapad_rfkill[dev])
return;
rfkill_unregister(ideapad_rfkill[dev]);
rfkill_destroy(ideapad_rfkill[dev]);
}
static const struct acpi_device_id ideapad_device_ids[] = {
{ "VPC2004", 0},
{ "", 0},
};
MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
static int ideapad_acpi_add(struct acpi_device *device)
{
int i;
int devs_present[5];
for (i = IDEAPAD_DEV_CAMERA; i < IDEAPAD_DEV_KILLSW; i++) {
devs_present[i] = ideapad_dev_exists(i);
if (devs_present[i] < 0)
return devs_present[i];
}
/* The hardware switch is always present */
devs_present[IDEAPAD_DEV_KILLSW] = 1;
if (devs_present[IDEAPAD_DEV_CAMERA]) {
int ret = device_create_file(&device->dev, &dev_attr_camera_power);
if (ret)
return ret;
}
for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++) {
if (!devs_present[i])
continue;
ideapad_register_rfkill(device, i);
}
ideapad_sync_rfk_state();
return 0;
}
static int ideapad_acpi_remove(struct acpi_device *device, int type)
{
int i;
device_remove_file(&device->dev, &dev_attr_camera_power);
for (i = 0; i < 5; i++)
ideapad_unregister_rfkill(i);
return 0;
}
static void ideapad_acpi_notify(struct acpi_device *device, u32 event)
{
ideapad_sync_rfk_state();
}
static struct acpi_driver ideapad_acpi_driver = {
.name = "ideapad_acpi",
.class = "IdeaPad",
.ids = ideapad_device_ids,
.ops.add = ideapad_acpi_add,
.ops.remove = ideapad_acpi_remove,
.ops.notify = ideapad_acpi_notify,
.owner = THIS_MODULE,
};
static int __init ideapad_acpi_module_init(void)
{
acpi_bus_register_driver(&ideapad_acpi_driver);
return 0;
}
static void __exit ideapad_acpi_module_exit(void)
{
acpi_bus_unregister_driver(&ideapad_acpi_driver);
}
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("IdeaPad ACPI Extras");
MODULE_LICENSE("GPL");
module_init(ideapad_acpi_module_init);
module_exit(ideapad_acpi_module_exit);
