+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Driver for Motorola PCAP2 touchscreen as found in the EZX phone platform.
- *
- * Copyright (C) 2006 Harald Welte <laforge@openezx.org>
- * Copyright (C) 2009 Daniel Ribeiro <drwyrm@gmail.com>
- */
-
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/pm.h>
-#include <linux/timer.h>
-#include <linux/interrupt.h>
-#include <linux/platform_device.h>
-#include <linux/input.h>
-#include <linux/mfd/ezx-pcap.h>
-
-struct pcap_ts {
- struct pcap_chip *pcap;
- struct input_dev *input;
- struct delayed_work work;
- u16 x, y;
- u16 pressure;
- u8 read_state;
-};
-
-#define SAMPLE_DELAY 20 /* msecs */
-
-#define X_AXIS_MIN 0
-#define X_AXIS_MAX 1023
-#define Y_AXIS_MAX X_AXIS_MAX
-#define Y_AXIS_MIN X_AXIS_MIN
-#define PRESSURE_MAX X_AXIS_MAX
-#define PRESSURE_MIN X_AXIS_MIN
-
-static void pcap_ts_read_xy(void *data, u16 res[2])
-{
- struct pcap_ts *pcap_ts = data;
-
- switch (pcap_ts->read_state) {
- case PCAP_ADC_TS_M_PRESSURE:
- /* pressure reading is unreliable */
- if (res[0] > PRESSURE_MIN && res[0] < PRESSURE_MAX)
- pcap_ts->pressure = res[0];
- pcap_ts->read_state = PCAP_ADC_TS_M_XY;
- schedule_delayed_work(&pcap_ts->work, 0);
- break;
- case PCAP_ADC_TS_M_XY:
- pcap_ts->y = res[0];
- pcap_ts->x = res[1];
- if (pcap_ts->x <= X_AXIS_MIN || pcap_ts->x >= X_AXIS_MAX ||
- pcap_ts->y <= Y_AXIS_MIN || pcap_ts->y >= Y_AXIS_MAX) {
- /* pen has been released */
- input_report_abs(pcap_ts->input, ABS_PRESSURE, 0);
- input_report_key(pcap_ts->input, BTN_TOUCH, 0);
-
- pcap_ts->read_state = PCAP_ADC_TS_M_STANDBY;
- schedule_delayed_work(&pcap_ts->work, 0);
- } else {
- /* pen is touching the screen */
- input_report_abs(pcap_ts->input, ABS_X, pcap_ts->x);
- input_report_abs(pcap_ts->input, ABS_Y, pcap_ts->y);
- input_report_key(pcap_ts->input, BTN_TOUCH, 1);
- input_report_abs(pcap_ts->input, ABS_PRESSURE,
- pcap_ts->pressure);
-
- /* switch back to pressure read mode */
- pcap_ts->read_state = PCAP_ADC_TS_M_PRESSURE;
- schedule_delayed_work(&pcap_ts->work,
- msecs_to_jiffies(SAMPLE_DELAY));
- }
- input_sync(pcap_ts->input);
- break;
- default:
- dev_warn(&pcap_ts->input->dev,
- "pcap_ts: Warning, unhandled read_state %d\n",
- pcap_ts->read_state);
- break;
- }
-}
-
-static void pcap_ts_work(struct work_struct *work)
-{
- struct delayed_work *dw = to_delayed_work(work);
- struct pcap_ts *pcap_ts = container_of(dw, struct pcap_ts, work);
- u8 ch[2];
-
- pcap_set_ts_bits(pcap_ts->pcap,
- pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
-
- if (pcap_ts->read_state == PCAP_ADC_TS_M_STANDBY)
- return;
-
- /* start adc conversion */
- ch[0] = PCAP_ADC_CH_TS_X1;
- ch[1] = PCAP_ADC_CH_TS_Y1;
- pcap_adc_async(pcap_ts->pcap, PCAP_ADC_BANK_1, 0, ch,
- pcap_ts_read_xy, pcap_ts);
-}
-
-static irqreturn_t pcap_ts_event_touch(int pirq, void *data)
-{
- struct pcap_ts *pcap_ts = data;
-
- if (pcap_ts->read_state == PCAP_ADC_TS_M_STANDBY) {
- pcap_ts->read_state = PCAP_ADC_TS_M_PRESSURE;
- schedule_delayed_work(&pcap_ts->work, 0);
- }
- return IRQ_HANDLED;
-}
-
-static int pcap_ts_open(struct input_dev *dev)
-{
- struct pcap_ts *pcap_ts = input_get_drvdata(dev);
-
- pcap_ts->read_state = PCAP_ADC_TS_M_STANDBY;
- schedule_delayed_work(&pcap_ts->work, 0);
-
- return 0;
-}
-
-static void pcap_ts_close(struct input_dev *dev)
-{
- struct pcap_ts *pcap_ts = input_get_drvdata(dev);
-
- cancel_delayed_work_sync(&pcap_ts->work);
-
- pcap_ts->read_state = PCAP_ADC_TS_M_NONTS;
- pcap_set_ts_bits(pcap_ts->pcap,
- pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
-}
-
-static int pcap_ts_probe(struct platform_device *pdev)
-{
- struct input_dev *input_dev;
- struct pcap_ts *pcap_ts;
- int err = -ENOMEM;
-
- pcap_ts = kzalloc_obj(*pcap_ts);
- if (!pcap_ts)
- return err;
-
- pcap_ts->pcap = dev_get_drvdata(pdev->dev.parent);
- platform_set_drvdata(pdev, pcap_ts);
-
- input_dev = input_allocate_device();
- if (!input_dev)
- goto fail;
-
- INIT_DELAYED_WORK(&pcap_ts->work, pcap_ts_work);
-
- pcap_ts->read_state = PCAP_ADC_TS_M_NONTS;
- pcap_set_ts_bits(pcap_ts->pcap,
- pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
-
- pcap_ts->input = input_dev;
- input_set_drvdata(input_dev, pcap_ts);
-
- input_dev->name = "pcap-touchscreen";
- input_dev->phys = "pcap_ts/input0";
- input_dev->id.bustype = BUS_HOST;
- input_dev->id.vendor = 0x0001;
- input_dev->id.product = 0x0002;
- input_dev->id.version = 0x0100;
- input_dev->dev.parent = &pdev->dev;
- input_dev->open = pcap_ts_open;
- input_dev->close = pcap_ts_close;
-
- input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
- input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
- input_set_abs_params(input_dev, ABS_X, X_AXIS_MIN, X_AXIS_MAX, 0, 0);
- input_set_abs_params(input_dev, ABS_Y, Y_AXIS_MIN, Y_AXIS_MAX, 0, 0);
- input_set_abs_params(input_dev, ABS_PRESSURE, PRESSURE_MIN,
- PRESSURE_MAX, 0, 0);
-
- err = input_register_device(pcap_ts->input);
- if (err)
- goto fail_allocate;
-
- err = request_irq(pcap_to_irq(pcap_ts->pcap, PCAP_IRQ_TS),
- pcap_ts_event_touch, 0, "Touch Screen", pcap_ts);
- if (err)
- goto fail_register;
-
- return 0;
-
-fail_register:
- input_unregister_device(input_dev);
- goto fail;
-fail_allocate:
- input_free_device(input_dev);
-fail:
- kfree(pcap_ts);
-
- return err;
-}
-
-static void pcap_ts_remove(struct platform_device *pdev)
-{
- struct pcap_ts *pcap_ts = platform_get_drvdata(pdev);
-
- free_irq(pcap_to_irq(pcap_ts->pcap, PCAP_IRQ_TS), pcap_ts);
- cancel_delayed_work_sync(&pcap_ts->work);
-
- input_unregister_device(pcap_ts->input);
-
- kfree(pcap_ts);
-}
-
-#ifdef CONFIG_PM
-static int pcap_ts_suspend(struct device *dev)
-{
- struct pcap_ts *pcap_ts = dev_get_drvdata(dev);
-
- pcap_set_ts_bits(pcap_ts->pcap, PCAP_ADC_TS_REF_LOWPWR);
- return 0;
-}
-
-static int pcap_ts_resume(struct device *dev)
-{
- struct pcap_ts *pcap_ts = dev_get_drvdata(dev);
-
- pcap_set_ts_bits(pcap_ts->pcap,
- pcap_ts->read_state << PCAP_ADC_TS_M_SHIFT);
- return 0;
-}
-
-static const struct dev_pm_ops pcap_ts_pm_ops = {
- .suspend = pcap_ts_suspend,
- .resume = pcap_ts_resume,
-};
-#define PCAP_TS_PM_OPS (&pcap_ts_pm_ops)
-#else
-#define PCAP_TS_PM_OPS NULL
-#endif
-
-static struct platform_driver pcap_ts_driver = {
- .probe = pcap_ts_probe,
- .remove = pcap_ts_remove,
- .driver = {
- .name = "pcap-ts",
- .pm = PCAP_TS_PM_OPS,
- },
-};
-module_platform_driver(pcap_ts_driver);
-
-MODULE_DESCRIPTION("Motorola PCAP2 touchscreen driver");
-MODULE_AUTHOR("Daniel Ribeiro / Harald Welte");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:pcap_ts");
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