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/*
* Copyright 2016-2017 Toradex AG
* Dominik Sliwa <dominik.sliwa@toradex.com>
*
* Based on driver for the Freescale Semiconductor MC13783 touchscreen by:
* Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright (C) 2009 Sascha Hauer, Pengutronix
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*/
#include <linux/platform_device.h>
#include <linux/mfd/apalis-tk1-k20.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/init.h>
#define APALIS_TK1_K20_TS_NAME "apalis-tk1-k20-ts"
struct apalis_tk1_k20_ts {
struct input_dev *idev;
struct apalis_tk1_k20_regmap *apalis_tk1_k20;
struct delayed_work work;
struct workqueue_struct *workq;
uint16_t sample[4];
};
static irqreturn_t apalis_tk1_k20_ts_handler(int irq, void *data)
{
struct apalis_tk1_k20_ts *priv = data;
/*
* Kick off reading coordinates. Note that if work happens already
* be queued for future execution (it rearms itself) it will not
* be rescheduled for immediate execution here. However the rearm
* delay is HZ / 25 which is acceptable.
*/
queue_delayed_work(priv->workq, &priv->work, 0);
return IRQ_HANDLED;
}
static void apalis_tk1_k20_ts_report_sample(struct apalis_tk1_k20_ts *priv)
{
struct input_dev *idev = priv->idev;
int xp, xm, yp, ym;
int x, y, press, btn;
xp = priv->sample[1];
xm = priv->sample[0];
yp = priv->sample[3];
ym = priv->sample[2];
x = (xp + xm) / 2;
y = (yp + ym) / 2;
press = (abs(yp - ym) + abs(xp - xm)) / 2;
if ((yp != 0) && (xp != 0)) {
btn = 1;
input_report_abs(idev, ABS_X, x);
input_report_abs(idev, ABS_Y, y);
dev_dbg(&idev->dev, "report (%d, %d, %d)\n",
x, y, press);
queue_delayed_work(priv->workq, &priv->work, HZ / 25);
} else {
dev_dbg(&idev->dev, "report release\n");
btn = 0;
}
input_report_abs(idev, ABS_PRESSURE, press);
input_report_key(idev, BTN_TOUCH, btn);
input_sync(idev);
}
static void apalis_tk1_k20_ts_work(struct work_struct *work)
{
struct apalis_tk1_k20_ts *priv =
container_of(work, struct apalis_tk1_k20_ts, work.work);
uint8_t buf[8], i;
apalis_tk1_k20_lock(priv->apalis_tk1_k20);
if (apalis_tk1_k20_reg_read_bulk(priv->apalis_tk1_k20,
APALIS_TK1_K20_TSC_XML, buf, 8) < 0) {
apalis_tk1_k20_unlock(priv->apalis_tk1_k20);
dev_err(&priv->idev->dev, "Error reading data\n");
return;
}
apalis_tk1_k20_unlock(priv->apalis_tk1_k20);
for (i = 0; i < 4; i++)
priv->sample[i] = (buf[(2 * i) + 1] << 8) + buf[2 * i];
apalis_tk1_k20_ts_report_sample(priv);
}
static int apalis_tk1_k20_ts_open(struct input_dev *dev)
{
struct apalis_tk1_k20_ts *priv = input_get_drvdata(dev);
int ret;
apalis_tk1_k20_lock(priv->apalis_tk1_k20);
ret = apalis_tk1_k20_irq_request(priv->apalis_tk1_k20,
APALIS_TK1_K20_TSC_IRQ, apalis_tk1_k20_ts_handler,
APALIS_TK1_K20_TS_NAME, priv);
if (ret)
goto out;
ret = apalis_tk1_k20_reg_rmw(priv->apalis_tk1_k20,
APALIS_TK1_K20_TSCREG, APALIS_TK1_K20_TSC_ENA_MASK,
APALIS_TK1_K20_TSC_ENA);
if (ret)
apalis_tk1_k20_irq_free(priv->apalis_tk1_k20,
APALIS_TK1_K20_TSC_IRQ, priv);
out:
apalis_tk1_k20_unlock(priv->apalis_tk1_k20);
return ret;
}
static void apalis_tk1_k20_ts_close(struct input_dev *dev)
{
struct apalis_tk1_k20_ts *priv = input_get_drvdata(dev);
apalis_tk1_k20_lock(priv->apalis_tk1_k20);
apalis_tk1_k20_reg_rmw(priv->apalis_tk1_k20, APALIS_TK1_K20_TSCREG,
APALIS_TK1_K20_TSC_ENA_MASK, 0);
apalis_tk1_k20_irq_free(priv->apalis_tk1_k20, APALIS_TK1_K20_TSC_IRQ,
priv);
apalis_tk1_k20_unlock(priv->apalis_tk1_k20);
cancel_delayed_work_sync(&priv->work);
}
static int __init apalis_tk1_k20_ts_probe(struct platform_device *pdev)
{
struct apalis_tk1_k20_ts *priv;
struct input_dev *idev;
int ret = -ENOMEM;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
idev = input_allocate_device();
if (!priv || !idev)
goto err_free_mem;
INIT_DELAYED_WORK(&priv->work, apalis_tk1_k20_ts_work);
priv->apalis_tk1_k20 = dev_get_drvdata(pdev->dev.parent);
priv->idev = idev;
priv->workq = create_singlethread_workqueue("apalis_tk1_k20_ts");
if (!priv->workq)
goto err_free_mem;
idev->name = APALIS_TK1_K20_TS_NAME;
idev->dev.parent = &pdev->dev;
idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
input_set_abs_params(idev, ABS_X, 0, 0xfff, 0, 0);
input_set_abs_params(idev, ABS_Y, 0, 0xfff, 0, 0);
input_set_abs_params(idev, ABS_PRESSURE, 0, 0xfff, 0, 0);
idev->open = apalis_tk1_k20_ts_open;
idev->close = apalis_tk1_k20_ts_close;
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_destroy_wq;
}
platform_set_drvdata(pdev, priv);
return 0;
err_destroy_wq:
destroy_workqueue(priv->workq);
err_free_mem:
input_free_device(idev);
kfree(priv);
return ret;
}
static int __exit apalis_tk1_k20_ts_remove(struct platform_device *pdev)
{
struct apalis_tk1_k20_ts *priv = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
destroy_workqueue(priv->workq);
input_unregister_device(priv->idev);
kfree(priv);
return 0;
}
static const struct platform_device_id apalis_tk1_k20_ts_idtable[] = {
{
.name = "apalis-tk1-k20-ts",
},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, apalis_tk1_k20_ts_idtable);
static struct platform_driver apalis_tk1_k20_ts_driver = {
.id_table = apalis_tk1_k20_ts_idtable,
.remove = __exit_p(apalis_tk1_k20_ts_remove),
.driver = {
.owner = THIS_MODULE,
.name = APALIS_TK1_K20_TS_NAME,
},
};
module_platform_driver_probe(apalis_tk1_k20_ts_driver,
&apalis_tk1_k20_ts_probe);
MODULE_DESCRIPTION("K20 touchscreen controller on Apalis TK1");
MODULE_AUTHOR("Dominik Sliwa <dominik.sliwa@toradex.com>");
MODULE_LICENSE("GPL v2");
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