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/*
Dell Airplane Mode Switch driver
Copyright (C) 2014-2015 Pali Rohár <pali.rohar@gmail.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.
*/
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/rfkill.h>
#include <linux/input.h>
enum rbtn_type {
RBTN_UNKNOWN,
RBTN_TOGGLE,
RBTN_SLIDER,
};
struct rbtn_data {
enum rbtn_type type;
struct rfkill *rfkill;
struct input_dev *input_dev;
};
/*
* acpi functions
*/
static enum rbtn_type rbtn_check(struct acpi_device *device)
{
unsigned long long output;
acpi_status status;
status = acpi_evaluate_integer(device->handle, "CRBT", NULL, &output);
if (ACPI_FAILURE(status))
return RBTN_UNKNOWN;
switch (output) {
case 0:
case 1:
return RBTN_TOGGLE;
case 2:
case 3:
return RBTN_SLIDER;
default:
return RBTN_UNKNOWN;
}
}
static int rbtn_get(struct acpi_device *device)
{
unsigned long long output;
acpi_status status;
status = acpi_evaluate_integer(device->handle, "GRBT", NULL, &output);
if (ACPI_FAILURE(status))
return -EINVAL;
return !output;
}
static int rbtn_acquire(struct acpi_device *device, bool enable)
{
struct acpi_object_list input;
union acpi_object param;
acpi_status status;
param.type = ACPI_TYPE_INTEGER;
param.integer.value = enable;
input.count = 1;
input.pointer = ¶m;
status = acpi_evaluate_object(device->handle, "ARBT", &input, NULL);
if (ACPI_FAILURE(status))
return -EINVAL;
return 0;
}
/*
* rfkill device
*/
static void rbtn_rfkill_query(struct rfkill *rfkill, void *data)
{
struct acpi_device *device = data;
int state;
state = rbtn_get(device);
if (state < 0)
return;
rfkill_set_states(rfkill, state, state);
}
static int rbtn_rfkill_set_block(void *data, bool blocked)
{
/* NOTE: setting soft rfkill state is not supported */
return -EINVAL;
}
static struct rfkill_ops rbtn_ops = {
.query = rbtn_rfkill_query,
.set_block = rbtn_rfkill_set_block,
};
static int rbtn_rfkill_init(struct acpi_device *device)
{
struct rbtn_data *rbtn_data = device->driver_data;
int ret;
if (rbtn_data->rfkill)
return 0;
/*
* NOTE: rbtn controls all radio devices, not only WLAN
* but rfkill interface does not support "ANY" type
* so "WLAN" type is used
*/
rbtn_data->rfkill = rfkill_alloc("dell-rbtn", &device->dev,
RFKILL_TYPE_WLAN, &rbtn_ops, device);
if (!rbtn_data->rfkill)
return -ENOMEM;
ret = rfkill_register(rbtn_data->rfkill);
if (ret) {
rfkill_destroy(rbtn_data->rfkill);
rbtn_data->rfkill = NULL;
return ret;
}
return 0;
}
static void rbtn_rfkill_exit(struct acpi_device *device)
{
struct rbtn_data *rbtn_data = device->driver_data;
if (!rbtn_data->rfkill)
return;
rfkill_unregister(rbtn_data->rfkill);
rfkill_destroy(rbtn_data->rfkill);
rbtn_data->rfkill = NULL;
}
static void rbtn_rfkill_event(struct acpi_device *device)
{
struct rbtn_data *rbtn_data = device->driver_data;
if (rbtn_data->rfkill)
rbtn_rfkill_query(rbtn_data->rfkill, device);
}
/*
* input device
*/
static int rbtn_input_init(struct rbtn_data *rbtn_data)
{
int ret;
rbtn_data->input_dev = input_allocate_device();
if (!rbtn_data->input_dev)
return -ENOMEM;
rbtn_data->input_dev->name = "DELL Wireless hotkeys";
rbtn_data->input_dev->phys = "dellabce/input0";
rbtn_data->input_dev->id.bustype = BUS_HOST;
rbtn_data->input_dev->evbit[0] = BIT(EV_KEY);
set_bit(KEY_RFKILL, rbtn_data->input_dev->keybit);
ret = input_register_device(rbtn_data->input_dev);
if (ret) {
input_free_device(rbtn_data->input_dev);
rbtn_data->input_dev = NULL;
return ret;
}
return 0;
}
static void rbtn_input_exit(struct rbtn_data *rbtn_data)
{
input_unregister_device(rbtn_data->input_dev);
rbtn_data->input_dev = NULL;
}
static void rbtn_input_event(struct rbtn_data *rbtn_data)
{
input_report_key(rbtn_data->input_dev, KEY_RFKILL, 1);
input_sync(rbtn_data->input_dev);
input_report_key(rbtn_data->input_dev, KEY_RFKILL, 0);
input_sync(rbtn_data->input_dev);
}
/*
* acpi driver
*/
static int rbtn_add(struct acpi_device *device);
static int rbtn_remove(struct acpi_device *device);
static void rbtn_notify(struct acpi_device *device, u32 event);
static const struct acpi_device_id rbtn_ids[] = {
{ "DELRBTN", 0 },
{ "DELLABCE", 0 },
{ "", 0 },
};
static struct acpi_driver rbtn_driver = {
.name = "dell-rbtn",
.ids = rbtn_ids,
.ops = {
.add = rbtn_add,
.remove = rbtn_remove,
.notify = rbtn_notify,
},
.owner = THIS_MODULE,
};
/*
* notifier export functions
*/
static bool auto_remove_rfkill = true;
static ATOMIC_NOTIFIER_HEAD(rbtn_chain_head);
static int rbtn_inc_count(struct device *dev, void *data)
{
struct acpi_device *device = to_acpi_device(dev);
struct rbtn_data *rbtn_data = device->driver_data;
int *count = data;
if (rbtn_data->type == RBTN_SLIDER)
(*count)++;
return 0;
}
static int rbtn_switch_dev(struct device *dev, void *data)
{
struct acpi_device *device = to_acpi_device(dev);
struct rbtn_data *rbtn_data = device->driver_data;
bool enable = data;
if (rbtn_data->type != RBTN_SLIDER)
return 0;
if (enable)
rbtn_rfkill_init(device);
else
rbtn_rfkill_exit(device);
return 0;
}
int dell_rbtn_notifier_register(struct notifier_block *nb)
{
bool first;
int count;
int ret;
count = 0;
ret = driver_for_each_device(&rbtn_driver.drv, NULL, &count,
rbtn_inc_count);
if (ret || count == 0)
return -ENODEV;
first = !rbtn_chain_head.head;
ret = atomic_notifier_chain_register(&rbtn_chain_head, nb);
if (ret != 0)
return ret;
if (auto_remove_rfkill && first)
ret = driver_for_each_device(&rbtn_driver.drv, NULL,
(void *)false, rbtn_switch_dev);
return ret;
}
EXPORT_SYMBOL_GPL(dell_rbtn_notifier_register);
int dell_rbtn_notifier_unregister(struct notifier_block *nb)
{
int ret;
ret = atomic_notifier_chain_unregister(&rbtn_chain_head, nb);
if (ret
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