LXR linux/drivers/input/touchscreen/jornada720

   1/*
   2 * drivers/input/touchscreen/jornada720_ts.c
   3 *
   4 * Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
   5 *
   6 *  Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl>
   7 *  based on HP Jornada 56x touchscreen driver by Alex Lange <chicken@handhelds.org>
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License version 2 as
  11 * published by the Free Software Foundation.
  12 *
  13 * HP Jornada 710/720/729 Touchscreen Driver
  14 */
  15
  16#include <linux/platform_device.h>
  17#include <linux/init.h>
  18#include <linux/input.h>
  19#include <linux/interrupt.h>
  20#include <linux/module.h>
  21#include <linux/slab.h>
  22#include <linux/io.h>
  23
  24#include <mach/hardware.h>
  25#include <mach/jornada720.h>
  26#include <mach/irqs.h>
  27
  28MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
  29MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver");
  30MODULE_LICENSE("GPL v2");
  31
  32struct jornada_ts {
  33        struct input_dev *dev;
  34        int x_data[4];          /* X sample values */
  35        int y_data[4];          /* Y sample values */
  36};
  37
  38static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts)
  39{
  40
  41    /* 3 low word X samples */
  42    jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY);
  43    jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY);
  44    jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY);
  45
  46    /* 3 low word Y samples */
  47    jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY);
  48    jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY);
  49    jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY);
  50
  51    /* combined x samples bits */
  52    jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY);
  53
  54    /* combined y samples bits */
  55    jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY);
  56}
  57
  58static int jornada720_ts_average(int coords[4])
  59{
  60        int coord, high_bits = coords[3];
  61
  62        coord  = coords[0] | ((high_bits & 0x03) << 8);
  63        coord += coords[1] | ((high_bits & 0x0c) << 6);
  64        coord += coords[2] | ((high_bits & 0x30) << 4);
  65
  66        return coord / 3;
  67}
  68
  69static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id)
  70{
  71        struct platform_device *pdev = dev_id;
  72        struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
  73        struct input_dev *input = jornada_ts->dev;
  74        int x, y;
  75
  76        /* If GPIO_GPIO9 is set to high then report pen up */
  77        if (GPLR & GPIO_GPIO(9)) {
  78                input_report_key(input, BTN_TOUCH, 0);
  79                input_sync(input);
  80        } else {
  81                jornada_ssp_start();
  82
  83                /* proper reply to request is always TXDUMMY */
  84                if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) {
  85                        jornada720_ts_collect_data(jornada_ts);
  86
  87                        x = jornada720_ts_average(jornada_ts->x_data);
  88                        y = jornada720_ts_average(jornada_ts->y_data);
  89
  90                        input_report_key(input, BTN_TOUCH, 1);
  91                        input_report_abs(input, ABS_X, x);
  92                        input_report_abs(input, ABS_Y, y);
  93                        input_sync(input);
  94                }
  95
  96                jornada_ssp_end();
  97        }
  98
  99        return IRQ_HANDLED;
 100}
 101
 102static int jornada720_ts_probe(struct platform_device *pdev)
 103{
 104        struct jornada_ts *jornada_ts;
 105        struct input_dev *input_dev;
 106        int error;
 107
 108        jornada_ts = kzalloc(sizeof(struct jornada_ts), GFP_KERNEL);
 109        input_dev = input_allocate_device();
 110
 111        if (!jornada_ts || !input_dev) {
 112                error = -ENOMEM;
 113                goto fail1;
 114        }
 115
 116        platform_set_drvdata(pdev, jornada_ts);
 117
 118        jornada_ts->dev = input_dev;
 119
 120        input_dev->name = "HP Jornada 7xx Touchscreen";
 121        input_dev->phys = "jornadats/input0";
 122        input_dev->id.bustype = BUS_HOST;
 123        input_dev->dev.parent = &pdev->dev;
 124
 125        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 126        input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
 127        input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0);
 128        input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0);
 129
 130        error = request_irq(IRQ_GPIO9,
 131                        jornada720_ts_interrupt,
 132                        IRQF_TRIGGER_RISING,
 133                        "HP7XX Touchscreen driver", pdev);
 134        if (error) {
 135                printk(KERN_INFO "HP7XX TS : Unable to acquire irq!\n");
 136                goto fail1;
 137        }
 138
 139        error = input_register_device(jornada_ts->dev);
 140        if (error)
 141                goto fail2;
 142
 143        return 0;
 144
 145 fail2:
 146        free_irq(IRQ_GPIO9, pdev);
 147 fail1:
 148        platform_set_drvdata(pdev, NULL);
 149        input_free_device(input_dev);
 150        kfree(jornada_ts);
 151        return error;
 152}
 153
 154static int jornada720_ts_remove(struct platform_device *pdev)
 155{
 156        struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
 157
 158        free_irq(IRQ_GPIO9, pdev);
 159        platform_set_drvdata(pdev, NULL);
 160        input_unregister_device(jornada_ts->dev);
 161        kfree(jornada_ts);
 162
 163        return 0;
 164}
 165
 166/* work with hotplug and coldplug */
 167MODULE_ALIAS("platform:jornada_ts");
 168
 169static struct platform_driver jornada720_ts_driver = {
 170        .probe          = jornada720_ts_probe,
 171        .remove         = jornada720_ts_remove,
 172        .driver         = {
 173                .name   = "jornada_ts",
 174                .owner  = THIS_MODULE,
 175        },
 176};
 177module_platform_driver(jornada720_ts_driver);
 178