LXR linux/drivers/input/touchscreen/jornada720

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * drivers/input/touchscreen/jornada720_ts.c
   4 *
   5 * Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
   6 *
   7 *  Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl>
   8 *  based on HP Jornada 56x touchscreen driver by Alex Lange <chicken@handhelds.org>
   9 *
  10 * HP Jornada 710/720/729 Touchscreen Driver
  11 */
  12
  13#include <linux/gpio/consumer.h>
  14#include <linux/platform_device.h>
  15#include <linux/input.h>
  16#include <linux/interrupt.h>
  17#include <linux/module.h>
  18#include <linux/slab.h>
  19#include <linux/io.h>
  20
  21#include <mach/jornada720.h>
  22
  23MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
  24MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver");
  25MODULE_LICENSE("GPL v2");
  26
  27struct jornada_ts {
  28        struct input_dev *dev;
  29        struct gpio_desc *gpio;
  30        int x_data[4];          /* X sample values */
  31        int y_data[4];          /* Y sample values */
  32};
  33
  34static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts)
  35{
  36        /* 3 low word X samples */
  37        jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY);
  38        jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY);
  39        jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY);
  40
  41        /* 3 low word Y samples */
  42        jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY);
  43        jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY);
  44        jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY);
  45
  46        /* combined x samples bits */
  47        jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY);
  48
  49        /* combined y samples bits */
  50        jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY);
  51}
  52
  53static int jornada720_ts_average(int coords[4])
  54{
  55        int coord, high_bits = coords[3];
  56
  57        coord  = coords[0] | ((high_bits & 0x03) << 8);
  58        coord += coords[1] | ((high_bits & 0x0c) << 6);
  59        coord += coords[2] | ((high_bits & 0x30) << 4);
  60
  61        return coord / 3;
  62}
  63
  64static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id)
  65{
  66        struct platform_device *pdev = dev_id;
  67        struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
  68        struct input_dev *input = jornada_ts->dev;
  69        int x, y;
  70
  71        /* If gpio is high then report pen up */
  72        if (gpiod_get_value(jornada_ts->gpio)) {
  73                input_report_key(input, BTN_TOUCH, 0);
  74                input_sync(input);
  75        } else {
  76                jornada_ssp_start();
  77
  78                /* proper reply to request is always TXDUMMY */
  79                if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) {
  80                        jornada720_ts_collect_data(jornada_ts);
  81
  82                        x = jornada720_ts_average(jornada_ts->x_data);
  83                        y = jornada720_ts_average(jornada_ts->y_data);
  84
  85                        input_report_key(input, BTN_TOUCH, 1);
  86                        input_report_abs(input, ABS_X, x);
  87                        input_report_abs(input, ABS_Y, y);
  88                        input_sync(input);
  89                }
  90
  91                jornada_ssp_end();
  92        }
  93
  94        return IRQ_HANDLED;
  95}
  96
  97static int jornada720_ts_probe(struct platform_device *pdev)
  98{
  99        struct jornada_ts *jornada_ts;
 100        struct input_dev *input_dev;
 101        int error, irq;
 102
 103        jornada_ts = devm_kzalloc(&pdev->dev, sizeof(*jornada_ts), GFP_KERNEL);
 104        if (!jornada_ts)
 105                return -ENOMEM;
 106
 107        input_dev = devm_input_allocate_device(&pdev->dev);
 108        if (!input_dev)
 109                return -ENOMEM;
 110
 111        platform_set_drvdata(pdev, jornada_ts);
 112
 113        jornada_ts->gpio = devm_gpiod_get(&pdev->dev, "penup", GPIOD_IN);
 114        if (IS_ERR(jornada_ts->gpio))
 115                return PTR_ERR(jornada_ts->gpio);
 116
 117        irq = gpiod_to_irq(jornada_ts->gpio);
 118        if (irq <= 0)
 119                return irq < 0 ? irq : -EINVAL;
 120
 121        jornada_ts->dev = input_dev;
 122
 123        input_dev->name = "HP Jornada 7xx Touchscreen";
 124        input_dev->phys = "jornadats/input0";
 125        input_dev->id.bustype = BUS_HOST;
 126        input_dev->dev.parent = &pdev->dev;
 127
 128        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 129        input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 130        input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0);
 131        input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0);
 132
 133        error = devm_request_irq(&pdev->dev, irq, jornada720_ts_interrupt,
 134                                 IRQF_TRIGGER_RISING,
 135                                 "HP7XX Touchscreen driver", pdev);
 136        if (error) {
 137                dev_err(&pdev->dev, "HP7XX TS : Unable to acquire irq!\n");
 138                return error;
 139        }
 140
 141        error = input_register_device(jornada_ts->dev);
 142        if (error)
 143                return error;
 144
 145        return 0;
 146}
 147
 148/* work with hotplug and coldplug */
 149MODULE_ALIAS("platform:jornada_ts");
 150
 151static struct platform_driver jornada720_ts_driver = {
 152        .probe          = jornada720_ts_probe,
 153        .driver         = {
 154                .name   = "jornada_ts",
 155        },
 156};
 157module_platform_driver(jornada720_ts_driver);
 158