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/*
* intel_byt_buttons.c - Baytrail-M key buttons driver
*
* Copyright (C) 2013 Intel Corporation
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* Author: Ning Li <ning.li@intel.com>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/input.h>
#include <linux/notifier.h>
#include <linux/platform_device.h>
#include <asm/intel_byt_ec.h>
#include <asm/intel_byt_buttons.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#define DRIVER_NAME "byt_buttons"
#define POWER_BTN_STAT_MASK (1 << 0)
#define VOLUP_BTN_STAT_MASK (1 << 1)
#define VOLDOWN_BTN_STAT_MASK (1 << 2)
#define HOME_BTN_STAT_MASK (1 << 3)
struct byt_buttons_priv {
struct input_dev *input;
struct notifier_block nb;
struct byt_keys_button *buttons;
u8 last_stat;
struct mutex btn_mutex;
};
static int byt_ec_evt_btn_callback(struct notifier_block *nb,
unsigned long event, void *data)
{
u8 stat;
u8 valid;
int ret = NOTIFY_OK;
struct byt_buttons_priv *priv;
priv = container_of(nb, struct byt_buttons_priv, nb);
switch (event) {
case BYT_EC_SCI_VOLUMEUP_BTN:
case BYT_EC_SCI_VOLUMEDOWN_BTN:
case BYT_EC_SCI_HOME_BTN:
case BYT_EC_SCI_POWER_BTN:
dev_dbg(&priv->input->dev, "ec button event\n");
mutex_lock(&priv->btn_mutex);
ret = byt_ec_read_byte(BYT_EC_BUTTON_STATUS, &stat);
if (ret) {
dev_err(&priv->input->dev,
"Query button status failed\n");
mutex_unlock(&priv->btn_mutex);
return NOTIFY_DONE;
}
valid = stat ^ priv->last_stat;
if (valid & VOLUP_BTN_STAT_MASK) {
input_event(priv->input, EV_KEY, KEY_VOLUMEUP,
!(stat & VOLUP_BTN_STAT_MASK));
}
if (valid & VOLDOWN_BTN_STAT_MASK) {
input_event(priv->input, EV_KEY, KEY_VOLUMEDOWN,
!(stat & VOLDOWN_BTN_STAT_MASK));
}
if (valid & POWER_BTN_STAT_MASK) {
input_event(priv->input, EV_KEY, KEY_POWER,
!(stat & POWER_BTN_STAT_MASK));
acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
}
if (valid & HOME_BTN_STAT_MASK) {
input_event(priv->input, EV_KEY, KEY_HOME,
!(stat & HOME_BTN_STAT_MASK));
}
input_sync(priv->input);
priv->last_stat = stat;
mutex_unlock(&priv->btn_mutex);
break;
default:
dev_err(&priv->input->dev, "Invalid event\n");
ret = NOTIFY_DONE;
}
return ret;
}
static int byt_buttons_probe(struct platform_device *pdev)
{
struct input_dev *input;
struct byt_buttons_priv *priv;
int i;
int ret;
struct byt_keys_platform_data *pdata = pdev->dev.platform_data;
struct byt_keys_button *button;
if (pdata == NULL) {
dev_err(&pdev->dev, "No button platform data\n");
return -EINVAL;
}
priv = kzalloc(sizeof(struct byt_buttons_priv), GFP_KERNEL);
input = input_allocate_device();
if (!priv || !input)
return -ENOMEM;
priv->input = input;
platform_set_drvdata(pdev, priv);
input->name = pdev->name;
input->phys = "buttons/input0";
input->id.bustype = BUS_HOST;
input->dev.parent = &pdev->dev;
if (pdata->rep)
__set_bit(EV_REP, input->evbit);
for (i = 0; i < pdata->nbuttons; i++) {
button = &pdata->buttons[i];
input_set_capability(input, button->type ?: EV_KEY,
button->code);
}
ret = input_register_device(input);
if (ret) {
dev_err(&pdev->dev,
"unable to register input dev, error %d\n", ret);
goto err;
}
priv->buttons = pdata->buttons;
priv->last_stat = POWER_BTN_STAT_MASK |
VOLUP_BTN_STAT_MASK |
VOLDOWN_BTN_STAT_MASK |
HOME_BTN_STAT_MASK;
mutex_init(&priv->btn_mutex);
/* Register notifier call as EC SCI events */
priv->nb.notifier_call = &byt_ec_evt_btn_callback;
byt_ec_evt_register_notify(&priv->nb);
dev_info(&pdev->dev, "Probed %s devivce\n", pdev->name);
return 0;
err:
platform_set_drvdata(pdev, NULL);
input_free_device(input);
kfree(priv);
return ret;
}
static int byt_buttons_remove(struct platform_device *pdev)
{
struct byt_buttons_priv *priv = platform_get_drvdata(pdev);
byt_ec_evt_unregister_notify(&priv->nb);
platform_set_drvdata(pdev, NULL);
input_unregister_device(priv->input);
kfree(priv);
return 0;
}
static const struct platform_device_id byt_buttons_table[] = {
{"byt_m_rpt_btns", 1},
{"byt_m_nrpt_btns", 1},
};
static struct platform_driver byt_buttons_driver = {
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
.probe = byt_buttons_probe,
.remove = byt_buttons_remove,
.id_table = byt_buttons_table,
};
static int __init byt_buttons_module_init(void)
{
return platform_driver_register(&byt_buttons_driver);
}
static void __exit byt_buttons_module_exit(void)
{
platform_driver_unregister(&byt_buttons_driver);
}
device_initcall(byt_buttons_module_init);
module_exit(byt_buttons_module_exit);
MODULE_AUTHOR("Ning Li <ning.li@intel.com>");
MODULE_DESCRIPTION("Intel Baytrail-M Buttons Driver");
MODULE_LICENSE("GPL v2");
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