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/*
* drivers/input/input-cfboost.c
*
* Copyright (c) 2012-2013 NVIDIA CORPORATION. All rights reserved.
*
* 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; version 2 of the License.
*
* 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/slab.h>
#include <linux/jiffies.h>
#include <linux/printk.h>
#include <linux/workqueue.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/pm_qos.h>
#define CREATE_TRACE_POINTS
#include <trace/events/input_cfboost.h>
/* This module listens to input events and sets a temporary frequency
* floor upon input event detection. This is based on changes to
* cpufreq ondemand governor by:
*
* Tero Kristo <tero.kristo@nokia.com>
* Brian Steuer <bsteuer@codeaurora.org>
* David Ng <dave@codeaurora.org>
*
* at git://codeaurora.org/kernel/msm.git tree, commits:
*
* 2a6181bc76c6ce46ca0fa8e547be42acd534cf0e
* 1cca8861d8fda4e05f6b0c59c60003345c15454d
* 96a9aeb02bf5b3fbbef47e44460750eb275e9f1b
* b600449501cf15928440f87eff86b1f32d14214e
* 88a65c7ae04632ffee11f9fc628d7ab017c06b83
*/
MODULE_AUTHOR("Antti P Miettinen <amiettinen@nvidia.com>");
MODULE_DESCRIPTION("Input event CPU frequency booster");
MODULE_LICENSE("GPL v2");
static struct pm_qos_request freq_req, core_req;
static struct work_struct boost;
static struct delayed_work unboost;
static unsigned int boost_freq; /* kHz */
static int boost_freq_set(const char *arg, const struct kernel_param *kp)
{
unsigned int old_boost = boost_freq;
int ret = param_set_uint(arg, kp);
if (ret == 0 && old_boost && !boost_freq)
pm_qos_update_request(&freq_req,
PM_QOS_DEFAULT_VALUE);
return ret;
}
static int boost_freq_get(char *buffer, const struct kernel_param *kp)
{
return param_get_uint(buffer, kp);
}
static struct kernel_param_ops boost_freq_ops = {
.set = boost_freq_set,
.get = boost_freq_get,
};
module_param_cb(boost_freq, &boost_freq_ops, &boost_freq, 0644);
static unsigned long boost_time = 500; /* ms */
module_param(boost_time, ulong, 0644);
static struct workqueue_struct *cfb_wq;
static void cfb_boost(struct work_struct *w)
{
trace_input_cfboost_params("boost_params", boost_freq, boost_time);
cancel_delayed_work_sync(&unboost);
pm_qos_update_request(&core_req, 1);
pm_qos_update_request(&freq_req, boost_freq);
queue_delayed_work(cfb_wq, &unboost, msecs_to_jiffies(boost_time));
}
static void cfb_unboost(struct work_struct *w)
{
pm_qos_update_request(&freq_req, PM_QOS_DEFAULT_VALUE);
pm_qos_update_request(&core_req, PM_QOS_DEFAULT_VALUE);
}
static void cfb_input_event(struct input_handle *handle, unsigned int type,
unsigned int code, int value)
{
trace_input_cfboost_event("event", type, code, value);
if (!work_pending(&boost))
queue_work(cfb_wq, &boost);
}
static int cfb_input_connect(struct input_handler *handler,
struct input_dev *dev,
const struct input_device_id *id)
{
struct input_handle *handle;
int error;
handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
if (!handle)
return -ENOMEM;
handle->dev = dev;
handle->handler = handler;
handle->name = "icfboost";
error = input_register_handle(handle);
if (error)
goto err2;
error = input_open_device(handle);
if (error)
goto err1;
return 0;
err1:
input_unregister_handle(handle);
err2:
kfree(handle);
return error;
}
static void cfb_input_disconnect(struct input_handle *handle)
{
input_close_device(handle);
input_unregister_handle(handle);
kfree(handle);
}
/* XXX make configurable */
static const struct input_device_id cfb_ids[] = {
{ /* touch screen */
.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
INPUT_DEVICE_ID_MATCH_KEYBIT,
.evbit = { BIT_MASK(EV_ABS) },
.keybit = {[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
},
{ /* mouse */
.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
INPUT_DEVICE_ID_MATCH_KEYBIT,
.evbit = { BIT_MASK(EV_REL) },
.keybit = {[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_MOUSE) },
},
/* keypad */
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
INPUT_DEVICE_ID_MATCH_KEYBIT,
.evbit = { BIT_MASK(EV_KEY) },
.keybit = {[BIT_WORD(KEY_HOME)] = BIT_MASK(KEY_HOME) },
},
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
INPUT_DEVICE_ID_MATCH_KEYBIT,
.evbit = { BIT_MASK(EV_KEY) },
.keybit = {[BIT_WORD(KEY_VOLUMEUP)] = BIT_MASK(KEY_VOLUMEUP) },
},
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
INPUT_DEVICE_ID_MATCH_KEYBIT,
.evbit = { BIT_MASK(EV_KEY) },
.keybit = {[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER) },
},
/* joystick */
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
INPUT_DEVICE_ID_MATCH_ABSBIT,
.evbit = { BIT_MASK(EV_ABS) },
.absbit = { BIT_MASK(ABS_X) },
},
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
INPUT_DEVICE_ID_MATCH_ABSBIT,
.evbit = { BIT_MASK(EV_ABS) },
.absbit = { BIT_MASK(ABS_WHEEL) },
},
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
INPUT_DEVICE_ID_MATCH_ABSBIT,
.evbit = { BIT_MASK(EV_ABS) },
.absbit = { BIT_MASK(ABS_THROTTLE) },
},
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
INPUT_DEVICE_ID_MATCH_KEYBIT,
.evbit = { BIT_MASK(EV_KEY) },
.keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) },
},
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
INPUT_DEVICE_ID_MATCH_KEYBIT,
.evbit = { BIT_MASK(EV_KEY) },
.keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) },
},
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
INPUT_DEVICE_ID_MATCH_KEYBIT,
.evbit = { BIT_MASK(EV_KEY) },
.keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] =
BIT_MASK(BTN_TRIGGER_HAPPY) },
},
/* stylus */
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT |
INPUT_DEVICE_ID_MATCH_KEYBIT,
.evbit = { BIT_MASK(EV_ABS) },
.keybit = {[BIT_WORD(BTN_TOOL_RUBBER)] =
BIT_MASK(BTN_TOOL_RUBBER) },
},
/* terminating entry */
{ },
};
static struct input_handler cfb_input_handler = {
.event = cfb_input_event,
.connect = cfb_input_connect,
.disconnect = cfb_input_disconnect,
.name = "icfboost",
.id_table = cfb_ids,
};
static int __init cfboost_init(void)
{
int ret;
cfb_wq = create_workqueue("icfb-wq");
if (!cfb_wq)
return -ENOMEM;
INIT_WORK(&boost, cfb_boost);
INIT_DELAYED_WORK(&unboost, cfb_unboost);
ret = input_register_handler(&cfb_input_handler);
if (ret) {
destroy_workqueue(cfb_wq);
return ret;
}
pm_qos_add_request(&core_req, PM_QOS_MIN_ONLINE_CPUS,
PM_QOS_DEFAULT_VALUE);
pm_qos_add_request(&freq_req, PM_QOS_CPU_FREQ_MIN,
PM_QOS_DEFAULT_VALUE);
return 0;
}
static void __exit cfboost_exit(void)
{
/* stop input events */
input_unregister_handler(&cfb_input_handler);
/* cancel pending work requests */
cancel_work_sync(&boost);
cancel_delayed_work_sync(&unboost);
/* clean up */
destroy_workqueue(cfb_wq);
pm_qos_remove_request(&freq_req);
pm_qos_remove_request(&core_req);
}
module_init(cfboost_init);
module_exit(cfboost_exit);
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