Orange Pi5 kernel

Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Philips UCB1400 touchscreen driver
*
* Author: Nicolas Pitre
* Created: September 25, 2006
* Copyright: MontaVista Software, Inc.
*
* Spliting done by: Marek Vasut <marek.vasut@gmail.com>
* If something doesn't work and it worked before spliting, e-mail me,
* dont bother Nicolas please ;-)
*
* This code is heavily based on ucb1x00-*.c copyrighted by Russell King
* covering the UCB1100, UCB1200 and UCB1300.. Support for the UCB1400 has
* been made separate from ucb1x00-core/ucb1x00-ts on Russell's request.
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/input.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/ucb1400.h>
#define UCB1400_TS_POLL_PERIOD 10 /* ms */
static bool adcsync;
static int ts_delay = 55; /* us */
static int ts_delay_pressure; /* us */
/* Switch to interrupt mode. */
static void ucb1400_ts_mode_int(struct ucb1400_ts *ucb)
{
<------>ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
<------><------><------>UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
<------><------><------>UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
<------><------><------>UCB_TS_CR_MODE_INT);
}
/*
* Switch to pressure mode, and read pressure. We don't need to wait
* here, since both plates are being driven.
*/
static unsigned int ucb1400_ts_read_pressure(struct ucb1400_ts *ucb)
{
<------>ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
<------><------><------>UCB_TS_CR_TSMX_POW | UCB_TS_CR_TSPX_POW |
<------><------><------>UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_GND |
<------><------><------>UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
<------>udelay(ts_delay_pressure);
<------>return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPY, adcsync);
}
/*
* Switch to X position mode and measure Y plate. We switch the plate
* configuration in pressure mode, then switch to position mode. This
* gives a faster response time. Even so, we need to wait about 55us
* for things to stabilise.
*/
static unsigned int ucb1400_ts_read_xpos(struct ucb1400_ts *ucb)
{
<------>ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
<------><------><------>UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
<------><------><------>UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
<------>ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
<------><------><------>UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
<------><------><------>UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
<------>ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
<------><------><------>UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
<------><------><------>UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
<------>udelay(ts_delay);
<------>return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPY, adcsync);
}
/*
* Switch to Y position mode and measure X plate. We switch the plate
* configuration in pressure mode, then switch to position mode. This
* gives a faster response time. Even so, we need to wait about 55us
* for things to stabilise.
*/
static int ucb1400_ts_read_ypos(struct ucb1400_ts *ucb)
{
<------>ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
<------><------><------>UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
<------><------><------>UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
<------>ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
<------><------><------>UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
<------><------><------>UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
<------>ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
<------><------><------>UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
<------><------><------>UCB_TS_CR_MODE_POS | UCB_TS_CR_BIAS_ENA);
<------>udelay(ts_delay);
<------>return ucb1400_adc_read(ucb->ac97, UCB_ADC_INP_TSPX, adcsync);
}
/*
* Switch to X plate resistance mode. Set MX to ground, PX to
* supply. Measure current.
*/
static unsigned int ucb1400_ts_read_xres(struct ucb1400_ts *ucb)
{
<------>ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
<------><------><------>UCB_TS_CR_TSMX_GND | UCB_TS_CR_TSPX_POW |
<------><------><------>UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
<------>return ucb1400_adc_read(ucb->ac97, 0, adcsync);
}
/*
* Switch to Y plate resistance mode. Set MY to ground, PY to
* supply. Measure current.
*/
static unsigned int ucb1400_ts_read_yres(struct ucb1400_ts *ucb)
{
<------>ucb1400_reg_write(ucb->ac97, UCB_TS_CR,
<------><------><------>UCB_TS_CR_TSMY_GND | UCB_TS_CR_TSPY_POW |
<------><------><------>UCB_TS_CR_MODE_PRES | UCB_TS_CR_BIAS_ENA);
<------>return ucb1400_adc_read(ucb->ac97, 0, adcsync);
}
static int ucb1400_ts_pen_up(struct ucb1400_ts *ucb)
{
<------>unsigned short val = ucb1400_reg_read(ucb->ac97, UCB_TS_CR);
<------>return val & (UCB_TS_CR_TSPX_LOW | UCB_TS_CR_TSMX_LOW);
}
static void ucb1400_ts_irq_enable(struct ucb1400_ts *ucb)
{
<------>ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, UCB_IE_TSPX);
<------>ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
<------>ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, UCB_IE_TSPX);
}
static void ucb1400_ts_irq_disable(struct ucb1400_ts *ucb)
{
<------>ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, 0);
}
static void ucb1400_ts_report_event(struct input_dev *idev, u16 pressure, u16 x, u16 y)
{
<------>input_report_abs(idev, ABS_X, x);
<------>input_report_abs(idev, ABS_Y, y);
<------>input_report_abs(idev, ABS_PRESSURE, pressure);
<------>input_report_key(idev, BTN_TOUCH, 1);
<------>input_sync(idev);
}
static void ucb1400_ts_event_release(struct input_dev *idev)
{
<------>input_report_abs(idev, ABS_PRESSURE, 0);
<------>input_report_key(idev, BTN_TOUCH, 0);
<------>input_sync(idev);
}
static void ucb1400_clear_pending_irq(struct ucb1400_ts *ucb)
{
<------>unsigned int isr;
<------>isr = ucb1400_reg_read(ucb->ac97, UCB_IE_STATUS);
<------>ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, isr);
<------>ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
<------>if (isr & UCB_IE_TSPX)
<------><------>ucb1400_ts_irq_disable(ucb);
<------>else
<------><------>dev_dbg(&ucb->ts_idev->dev,
<------><------><------>"ucb1400: unexpected IE_STATUS = %#x\n", isr);
}
/*
* A restriction with interrupts exists when using the ucb1400, as
* the codec read/write routines may sleep while waiting for codec
* access completion and uses semaphores for access control to the
* AC97 bus. Therefore the driver is forced to use threaded interrupt
* handler.
*/
static irqreturn_t ucb1400_irq(int irqnr, void *devid)
{
<------>struct ucb1400_ts *ucb = devid;
<------>unsigned int x, y, p;
<------>bool penup;
<------>if (unlikely(irqnr != ucb->irq))
<------><------>return IRQ_NONE;
<------>ucb1400_clear_pending_irq(ucb);
<------>/* Start with a small delay before checking pendown state */
<------>msleep(UCB1400_TS_POLL_PERIOD);
<------>while (!ucb->stopped && !(penup = ucb1400_ts_pen_up(ucb))) {
<------><------>ucb1400_adc_enable(ucb->ac97);
<------><------>x = ucb1400_ts_read_xpos(ucb);
<------><------>y = ucb1400_ts_read_ypos(ucb);
<------><------>p = ucb1400_ts_read_pressure(ucb);
<------><------>ucb1400_adc_disable(ucb->ac97);
<------><------>ucb1400_ts_report_event(ucb->ts_idev, p, x, y);
<------><------>wait_event_timeout(ucb->ts_wait, ucb->stopped,
<------><------><------><------> msecs_to_jiffies(UCB1400_TS_POLL_PERIOD));
<------>}
<------>ucb1400_ts_event_release(ucb->ts_idev);
<------>if (!ucb->stopped) {
<------><------>/* Switch back to interrupt mode. */
<------><------>ucb1400_ts_mode_int(ucb);
<------><------>ucb1400_ts_irq_enable(ucb);
<------>}
<------>return IRQ_HANDLED;
}
static void ucb1400_ts_stop(struct ucb1400_ts *ucb)
{
<------>/* Signal IRQ thread to stop polling and disable the handler. */
<------>ucb->stopped = true;
<------>mb();
<------>wake_up(&ucb->ts_wait);
<------>disable_irq(ucb->irq);
<------>ucb1400_ts_irq_disable(ucb);
<------>ucb1400_reg_write(ucb->ac97, UCB_TS_CR, 0);
}
/* Must be called with ts->lock held */
static void ucb1400_ts_start(struct ucb1400_ts *ucb)
{
<------>/* Tell IRQ thread that it may poll the device. */
<------>ucb->stopped = false;
<------>mb();
<------>ucb1400_ts_mode_int(ucb);
<------>ucb1400_ts_irq_enable(ucb);
<------>enable_irq(ucb->irq);
}
static int ucb1400_ts_open(struct input_dev *idev)
{
<------>struct ucb1400_ts *ucb = input_get_drvdata(idev);
<------>ucb1400_ts_start(ucb);
<------>return 0;
}
static void ucb1400_ts_close(struct input_dev *idev)
{
<------>struct ucb1400_ts *ucb = input_get_drvdata(idev);
<------>ucb1400_ts_stop(ucb);
}
#ifndef NO_IRQ
#define NO_IRQ 0
#endif
/*
* Try to probe our interrupt, rather than relying on lots of
* hard-coded machine dependencies.
*/
static int ucb1400_ts_detect_irq(struct ucb1400_ts *ucb,
<------><------><------><------><------> struct platform_device *pdev)
{
<------>unsigned long mask, timeout;
<------>mask = probe_irq_on();
<------>/* Enable the ADC interrupt. */
<------>ucb1400_reg_write(ucb->ac97, UCB_IE_RIS, UCB_IE_ADC);
<------>ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, UCB_IE_ADC);
<------>ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0xffff);
<------>ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
<------>/* Cause an ADC interrupt. */
<------>ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, UCB_ADC_ENA);
<------>ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, UCB_ADC_ENA | UCB_ADC_START);
<------>/* Wait for the conversion to complete. */
<------>timeout = jiffies + HZ/2;
<------>while (!(ucb1400_reg_read(ucb->ac97, UCB_ADC_DATA) &
<------><------><------><------><------><------>UCB_ADC_DAT_VALID)) {
<------><------>cpu_relax();
<------><------>if (time_after(jiffies, timeout)) {
<------><------><------>dev_err(&pdev->dev, "timed out in IRQ probe\n");
<------><------><------>probe_irq_off(mask);
<------><------><------>return -ENODEV;
<------><------>}
<------>}
<------>ucb1400_reg_write(ucb->ac97, UCB_ADC_CR, 0);
<------>/* Disable and clear interrupt. */
<------>ucb1400_reg_write(ucb->ac97, UCB_IE_RIS, 0);
<------>ucb1400_reg_write(ucb->ac97, UCB_IE_FAL, 0);
<------>ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0xffff);
<------>ucb1400_reg_write(ucb->ac97, UCB_IE_CLEAR, 0);
<------>/* Read triggered interrupt. */
<------>ucb->irq = probe_irq_off(mask);
<------>if (ucb->irq < 0 || ucb->irq == NO_IRQ)
<------><------>return -ENODEV;
<------>return 0;
}
static int ucb1400_ts_probe(struct platform_device *pdev)
{
<------>struct ucb1400_ts *ucb = dev_get_platdata(&pdev->dev);
<------>int error, x_res, y_res;
<------>u16 fcsr;
<------>ucb->ts_idev = input_allocate_device();
<------>if (!ucb->ts_idev) {
<------><------>error = -ENOMEM;
<------><------>goto err;
<------>}
<------>/* Only in case the IRQ line wasn't supplied, try detecting it */
<------>if (ucb->irq < 0) {
<------><------>error = ucb1400_ts_detect_irq(ucb, pdev);
<------><------>if (error) {
<------><------><------>dev_err(&pdev->dev, "IRQ probe failed\n");
<------><------><------>goto err_free_devs;
<------><------>}
<------>}
<------>dev_dbg(&pdev->dev, "found IRQ %d\n", ucb->irq);
<------>init_waitqueue_head(&ucb->ts_wait);
<------>input_set_drvdata(ucb->ts_idev, ucb);
<------>ucb->ts_idev->dev.parent = &pdev->dev;
<------>ucb->ts_idev->name = "UCB1400 touchscreen interface";
<------>ucb->ts_idev->id.vendor = ucb1400_reg_read(ucb->ac97,
<------><------><------><------><------><------>AC97_VENDOR_ID1);
<------>ucb->ts_idev->id.product = ucb->id;
<------>ucb->ts_idev->open = ucb1400_ts_open;
<------>ucb->ts_idev->close = ucb1400_ts_close;
<------>ucb->ts_idev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY);
<------>ucb->ts_idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
<------>/*
<------> * Enable ADC filter to prevent horrible jitter on Colibri.
<------> * This also further reduces jitter on boards where ADCSYNC
<------> * pin is connected.
<------> */
<------>fcsr = ucb1400_reg_read(ucb->ac97, UCB_FCSR);
<------>ucb1400_reg_write(ucb->ac97, UCB_FCSR, fcsr | UCB_FCSR_AVE);
<------>ucb1400_adc_enable(ucb->ac97);
<------>x_res = ucb1400_ts_read_xres(ucb);
<------>y_res = ucb1400_ts_read_yres(ucb);
<------>ucb1400_adc_disable(ucb->ac97);
<------>dev_dbg(&pdev->dev, "x/y = %d/%d\n", x_res, y_res);
<------>input_set_abs_params(ucb->ts_idev, ABS_X, 0, x_res, 0, 0);
<------>input_set_abs_params(ucb->ts_idev, ABS_Y, 0, y_res, 0, 0);
<------>input_set_abs_params(ucb->ts_idev, ABS_PRESSURE, 0, 0, 0, 0);
<------>ucb1400_ts_stop(ucb);
<------>error = request_threaded_irq(ucb->irq, NULL, ucb1400_irq,
<------><------><------><------> IRQF_TRIGGER_RISING | IRQF_ONESHOT,
<------><------><------><------> "UCB1400", ucb);
<------>if (error) {
<------><------>dev_err(&pdev->dev,
<------><------><------>"unable to grab irq%d: %d\n", ucb->irq, error);
<------><------>goto err_free_devs;
<------>}
<------>error = input_register_device(ucb->ts_idev);
<------>if (error)
<------><------>goto err_free_irq;
<------>return 0;
err_free_irq:
<------>free_irq(ucb->irq, ucb);
err_free_devs:
<------>input_free_device(ucb->ts_idev);
err:
<------>return error;
}
static int ucb1400_ts_remove(struct platform_device *pdev)
{
<------>struct ucb1400_ts *ucb = dev_get_platdata(&pdev->dev);
<------>free_irq(ucb->irq, ucb);
<------>input_unregister_device(ucb->ts_idev);
<------>return 0;
}
static int __maybe_unused ucb1400_ts_suspend(struct device *dev)
{
<------>struct ucb1400_ts *ucb = dev_get_platdata(dev);
<------>struct input_dev *idev = ucb->ts_idev;
<------>mutex_lock(&idev->mutex);
<------>if (idev->users)
<------><------>ucb1400_ts_stop(ucb);
<------>mutex_unlock(&idev->mutex);
<------>return 0;
}
static int __maybe_unused ucb1400_ts_resume(struct device *dev)
{
<------>struct ucb1400_ts *ucb = dev_get_platdata(dev);
<------>struct input_dev *idev = ucb->ts_idev;
<------>mutex_lock(&idev->mutex);
<------>if (idev->users)
<------><------>ucb1400_ts_start(ucb);
<------>mutex_unlock(&idev->mutex);
<------>return 0;
}
static SIMPLE_DEV_PM_OPS(ucb1400_ts_pm_ops,
<------><------><------> ucb1400_ts_suspend, ucb1400_ts_resume);
static struct platform_driver ucb1400_ts_driver = {
<------>.probe = ucb1400_ts_probe,
<------>.remove = ucb1400_ts_remove,
<------>.driver = {
<------><------>.name = "ucb1400_ts",
<------><------>.pm = &ucb1400_ts_pm_ops,
<------>},
};
module_platform_driver(ucb1400_ts_driver);
module_param(adcsync, bool, 0444);
MODULE_PARM_DESC(adcsync, "Synchronize touch readings with ADCSYNC pin.");
module_param(ts_delay, int, 0444);
MODULE_PARM_DESC(ts_delay, "Delay between panel setup and"
<------><------><------> " position read. Default = 55us.");
module_param(ts_delay_pressure, int, 0444);
MODULE_PARM_DESC(ts_delay_pressure,
<------><------>"delay between panel setup and pressure read."
<------><------>" Default = 0us.");
MODULE_DESCRIPTION("Philips UCB1400 touchscreen driver");
MODULE_LICENSE("GPL");