Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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/
 */
#include <linux/platform_device.h>
#include <linux/mfd/mc13783.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 MC13783_TS_NAME	"mc13783-ts"
 
#define DEFAULT_SAMPLE_TOLERANCE 300
 
static unsigned int sample_tolerance = DEFAULT_SAMPLE_TOLERANCE;
module_param(sample_tolerance, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(sample_tolerance,
<------><------>"If the minimal and maximal value read out for one axis (out "
<------><------>"of three) differ by this value (default: "
<------><------>__stringify(DEFAULT_SAMPLE_TOLERANCE) ") or more, the reading "
<------><------>"is supposed to be wrong and is discarded.  Set to 0 to "
<------><------>"disable this check.");
 
struct mc13783_ts_priv {
<------>struct input_dev *idev;
<------>struct mc13xxx *mc13xxx;
<------>struct delayed_work work;
<------>unsigned int sample[4];
<------>struct mc13xxx_ts_platform_data *touch;
};
 
static irqreturn_t mc13783_ts_handler(int irq, void *data)
{
<------>struct mc13783_ts_priv *priv = data;
 
<------>mc13xxx_irq_ack(priv->mc13xxx, irq);
 
<------>/*
<------> * 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 / 50 which is acceptable.
<------> */
<------>schedule_delayed_work(&priv->work, 0);
 
<------>return IRQ_HANDLED;
}
 
#define sort3(a0, a1, a2) ({						\
<------><------>if (a0 > a1)						\
<------><------><------>swap(a0, a1);					\
<------><------>if (a1 > a2)						\
<------><------><------>swap(a1, a2);					\
<------><------>if (a0 > a1)						\
<------><------><------>swap(a0, a1);					\
<------><------>})
 
static void mc13783_ts_report_sample(struct mc13783_ts_priv *priv)
{
<------>struct input_dev *idev = priv->idev;
<------>int x0, x1, x2, y0, y1, y2;
<------>int cr0, cr1;
 
<------>/*
<------> * the values are 10-bit wide only, but the two least significant
<------> * bits are for future 12 bit use and reading yields 0
<------> */
<------>x0 = priv->sample[0] & 0xfff;
<------>x1 = priv->sample[1] & 0xfff;
<------>x2 = priv->sample[2] & 0xfff;
<------>y0 = priv->sample[3] & 0xfff;
<------>y1 = (priv->sample[0] >> 12) & 0xfff;
<------>y2 = (priv->sample[1] >> 12) & 0xfff;
<------>cr0 = (priv->sample[2] >> 12) & 0xfff;
<------>cr1 = (priv->sample[3] >> 12) & 0xfff;
 
<------>dev_dbg(&idev->dev,
<------><------>"x: (% 4d,% 4d,% 4d) y: (% 4d, % 4d,% 4d) cr: (% 4d, % 4d)\n",
<------><------>x0, x1, x2, y0, y1, y2, cr0, cr1);
 
<------>sort3(x0, x1, x2);
<------>sort3(y0, y1, y2);
 
<------>cr0 = (cr0 + cr1) / 2;
 
<------>if (!cr0 || !sample_tolerance ||
<------><------><------>(x2 - x0 < sample_tolerance &&
<------><------><------> y2 - y0 < sample_tolerance)) {
<------><------>/* report the median coordinate and average pressure */
<------><------>if (cr0) {
<------><------><------>input_report_abs(idev, ABS_X, x1);
<------><------><------>input_report_abs(idev, ABS_Y, y1);
 
<------><------><------>dev_dbg(&idev->dev, "report (%d, %d, %d)\n",
<------><------><------><------><------>x1, y1, 0x1000 - cr0);
<------><------><------>schedule_delayed_work(&priv->work, HZ / 50);
<------><------>} else {
<------><------><------>dev_dbg(&idev->dev, "report release\n");
<------><------>}
 
<------><------>input_report_abs(idev, ABS_PRESSURE,
<------><------><------><------>cr0 ? 0x1000 - cr0 : cr0);
<------><------>input_report_key(idev, BTN_TOUCH, cr0);
<------><------>input_sync(idev);
<------>} else {
<------><------>dev_dbg(&idev->dev, "discard event\n");
<------>}
}
 
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 = MC13XXX_ADC_MODE_TS;
<------>unsigned int channel = 12;
 
<------>if (mc13xxx_adc_do_conversion(priv->mc13xxx,
<------><------><------><------>mode, channel,
<------><------><------><------>priv->touch->ato, priv->touch->atox,
<------><------><------><------>priv->sample) == 0)
<------><------>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;
 
<------>mc13xxx_lock(priv->mc13xxx);
 
<------>mc13xxx_irq_ack(priv->mc13xxx, MC13XXX_IRQ_TS);
 
<------>ret = mc13xxx_irq_request(priv->mc13xxx, MC13XXX_IRQ_TS,
<------><------>mc13783_ts_handler, MC13783_TS_NAME, priv);
<------>if (ret)
<------><------>goto out;
 
<------>ret = mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0,
<------><------><------>MC13XXX_ADC0_TSMOD_MASK, MC13XXX_ADC0_TSMOD0);
<------>if (ret)
<------><------>mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TS, priv);
out:
<------>mc13xxx_unlock(priv->mc13xxx);
<------>return ret;
}
 
static void mc13783_ts_close(struct input_dev *dev)
{
<------>struct mc13783_ts_priv *priv = input_get_drvdata(dev);
 
<------>mc13xxx_lock(priv->mc13xxx);
<------>mc13xxx_reg_rmw(priv->mc13xxx, MC13XXX_ADC0,
<------><------><------>MC13XXX_ADC0_TSMOD_MASK, 0);
<------>mc13xxx_irq_free(priv->mc13xxx, MC13XXX_IRQ_TS, priv);
<------>mc13xxx_unlock(priv->mc13xxx);
 
<------>cancel_delayed_work_sync(&priv->work);
}
 
static int __init mc13783_ts_probe(struct platform_device *pdev)
{
<------>struct mc13783_ts_priv *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, mc13783_ts_work);
<------>priv->mc13xxx = dev_get_drvdata(pdev->dev.parent);
<------>priv->idev = idev;
<------>priv->touch = dev_get_platdata(&pdev->dev);
<------>if (!priv->touch) {
<------><------>dev_err(&pdev->dev, "missing platform data\n");
<------><------>ret = -ENODEV;
<------><------>goto err_free_mem;
<------>}
 
<------>idev->name = MC13783_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 = mc13783_ts_open;
<------>idev->close = mc13783_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_free_mem;
<------>}
 
<------>platform_set_drvdata(pdev, priv);
<------>return 0;
 
err_free_mem:
<------>input_free_device(idev);
<------>kfree(priv);
<------>return ret;
}
 
static int mc13783_ts_remove(struct platform_device *pdev)
{
<------>struct mc13783_ts_priv *priv = platform_get_drvdata(pdev);
 
<------>input_unregister_device(priv->idev);
<------>kfree(priv);
 
<------>return 0;
}
 
static struct platform_driver mc13783_ts_driver = {
<------>.remove		= mc13783_ts_remove,
<------>.driver		= {
<------><------>.name	= MC13783_TS_NAME,
<------>},
};
 
module_platform_driver_probe(mc13783_ts_driver, mc13783_ts_probe);
 
MODULE_DESCRIPTION("MC13783 input touchscreen driver");
MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" MC13783_TS_NAME);