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/*
* Driver for the Freescale Semiconductor MC13783 touchscreen.
*
* Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright (C) 2009 Sascha Hauer, Pengutronix
*
* Initial development of this code was funded by
* Phytec Messtechnik GmbH, http://www.phytec.de
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <linux/mfd/mc13783-private.h>
#include <linux/platform_device.h>
#include <linux/mfd/mc13783.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/input.h>
#include <linux/sched.h>
#include <linux/init.h>
#define MC13783_TS_NAME "mc13783-ts"
struct mc13783_ts_priv {
struct input_dev *idev;
struct mc13783 *mc13783;
struct delayed_work work;
struct workqueue_struct *workq;
unsigned int sample[4];
};
#define TS_MIN 1
#define TS_MAX 1000
static void mc13783_ts_handler(int irq, void *data)
{
struct mc13783_ts_priv *priv = data;
unsigned int sts;
mc13783_reg_read(priv->mc13783, MC13783_REG_INTERRUPT_STATUS_0, &sts);
mc13783_reg_write(priv->mc13783, MC13783_REG_INTERRUPT_STATUS_0,
sts & MC13783_INT_STAT_TSI);
if (sts & MC13783_INT_STAT_TSI)
queue_delayed_work(priv->workq, &priv->work, 0);
}
static void mc13783_ts_report_sample(struct mc13783_ts_priv *priv)
{
int x, y, press = 0;
x = (priv->sample[2] >> 2) & 0x3ff;
y = (priv->sample[3] >> 2) & 0x3ff;
pr_debug("mc13783_ts: x: %d y: %d\n", x, y);
if (x > TS_MIN && x < TS_MAX && y > TS_MIN && y < TS_MAX) {
press = 1;
input_report_abs(priv->idev, ABS_X, x);
input_report_abs(priv->idev, ABS_Y, y);
queue_delayed_work(priv->workq, &priv->work, HZ / 50);
}
// XXX: must use ABS_PRESSURE instead of touch for tslib
//input_report_key(priv->idev, BTN_TOUCH, press);
input_report_abs(priv->idev, ABS_PRESSURE, press);
input_sync(priv->idev);
}
static void mc13783_ts_work(struct work_struct *work)
{
struct mc13783_ts_priv *priv =
container_of(work, struct mc13783_ts_priv, work.work);
unsigned int mode = MC13783_ADC_MODE_TS;
unsigned int channel = 12;
int ret;
ret = mc13783_adc_do_conversion
(priv->mc13783, mode, channel, priv->sample);
if (!ret)
mc13783_ts_report_sample(priv);
}
static int mc13783_ts_open(struct input_dev *dev)
{
struct mc13783_ts_priv *priv = input_get_drvdata(dev);
int ret;
ret = mc13783_register_irq(priv->mc13783, MC13783_IRQ_TS,
mc13783_ts_handler, priv);
if (ret)
return ret;
queue_delayed_work(priv->workq, &priv->work, HZ / 20);
return 0;
}
static void mc13783_ts_close(struct input_dev *dev)
{
struct mc13783_ts_priv *priv = input_get_drvdata(dev);
mc13783_free_irq(priv->mc13783, MC13783_IRQ_TS);
}
static int __devinit mc13783_ts_probe(struct platform_device *pdev)
{
struct mc13783_ts_priv *priv;
struct input_dev *idev;
int ret;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->mc13783 = dev_get_drvdata(pdev->dev.parent);
idev = input_allocate_device();
if (!idev) {
ret = -ENOMEM;
goto err_input_alloc;
}
priv->idev = idev;
idev->name = MC13783_TS_NAME;
idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
idev->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) | BIT_MASK(ABS_PRESSURE);
idev->open = mc13783_ts_open;
idev->close = mc13783_ts_close;
input_set_abs_params(idev, ABS_X, TS_MIN, TS_MAX, 0, 0);
input_set_abs_params(idev, ABS_Y, TS_MIN, TS_MAX, 0, 0);
platform_set_drvdata(pdev, priv);
INIT_DELAYED_WORK(&priv->work, mc13783_ts_work);
priv->workq = create_singlethread_workqueue("mc13783_ts");
if (!priv->workq) {
ret = -ENOMEM;
goto err_input_alloc;
}
input_set_drvdata(idev, priv);
ret = input_register_device(priv->idev);
if (ret) {
dev_err(&pdev->dev,
"register input device failed with %d\n", ret);
goto err_failed_register;
}
/* unmask the ts wakeup interrupt */
mc13783_set_bits(priv->mc13783, MC13783_REG_INTERRUPT_MASK_0,
MC13783_INT_MASK_TSM, 0);
mc13783_adc_set_ts_status(priv->mc13783, 1);
return 0;
err_failed_register:
input_free_device(priv->idev);
err_input_alloc:
kfree(priv);
return ret;
}
static int __devexit mc13783_ts_remove(struct platform_device *pdev)
{
struct mc13783_ts_priv *priv = platform_get_drvdata(pdev);
mc13783_adc_set_ts_status(priv->mc13783, 0);
cancel_delayed_work(&priv->work);
destroy_workqueue(priv->workq);
input_unregister_device(priv->idev);
kfree(priv);
return 0;
}
static struct platform_driver mc13783_ts_driver = {
.remove = __devexit_p(mc13783_ts_remove),
.driver = {
.owner = THIS_MODULE,
.name = MC13783_TS_NAME,
},
};
static int __init mc13783_ts_init(void)
{
return platform_driver_probe(&mc13783_ts_driver, &mc13783_ts_probe);
}
static void __exit mc13783_ts_exit(void)
{
platform_driver_unregister(&mc13783_ts_driver);
}
module_init(mc13783_ts_init);
module_exit(mc13783_ts_exit);
MODULE_DESCRIPTION("MC13783 input touchscreen driver");
MODULE_AUTHOR("Sascha Hauer, <s.hauer@pengutronix.de>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:mc13783-touch");
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