linux/drivers/input/touchscreen/ipaq-micro-ts.c
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   1/*
   2 * This program is free software; you can redistribute it and/or modify
   3 * it under the terms of the GNU General Public License version 2 as
   4 * published by the Free Software Foundation.
   5 *
   6 * h3600 atmel micro companion support, touchscreen subdevice
   7 * Author : Alessandro Gardich <gremlin@gremlin.it>
   8 * Author : Dmitry Artamonow <mad_soft@inbox.ru>
   9 * Author : Linus Walleij <linus.walleij@linaro.org>
  10 *
  11 */
  12
  13#include <asm/byteorder.h>
  14#include <linux/module.h>
  15#include <linux/init.h>
  16#include <linux/interrupt.h>
  17#include <linux/pm.h>
  18#include <linux/delay.h>
  19#include <linux/device.h>
  20#include <linux/input.h>
  21#include <linux/platform_device.h>
  22#include <linux/slab.h>
  23#include <linux/mfd/ipaq-micro.h>
  24
  25struct touchscreen_data {
  26        struct input_dev *input;
  27        struct ipaq_micro *micro;
  28};
  29
  30static void micro_ts_receive(void *data, int len, unsigned char *msg)
  31{
  32        struct touchscreen_data *ts = data;
  33
  34        if (len == 4) {
  35                input_report_abs(ts->input, ABS_X,
  36                                 be16_to_cpup((__be16 *) &msg[2]));
  37                input_report_abs(ts->input, ABS_Y,
  38                                 be16_to_cpup((__be16 *) &msg[0]));
  39                input_report_key(ts->input, BTN_TOUCH, 1);
  40                input_sync(ts->input);
  41        } else if (len == 0) {
  42                input_report_abs(ts->input, ABS_X, 0);
  43                input_report_abs(ts->input, ABS_Y, 0);
  44                input_report_key(ts->input, BTN_TOUCH, 0);
  45                input_sync(ts->input);
  46        }
  47}
  48
  49static void micro_ts_toggle_receive(struct touchscreen_data *ts, bool enable)
  50{
  51        struct ipaq_micro *micro = ts->micro;
  52
  53        spin_lock_irq(&micro->lock);
  54
  55        if (enable) {
  56                micro->ts = micro_ts_receive;
  57                micro->ts_data = ts;
  58        } else {
  59                micro->ts = NULL;
  60                micro->ts_data = NULL;
  61        }
  62
  63        spin_unlock_irq(&ts->micro->lock);
  64}
  65
  66static int micro_ts_open(struct input_dev *input)
  67{
  68        struct touchscreen_data *ts = input_get_drvdata(input);
  69
  70        micro_ts_toggle_receive(ts, true);
  71
  72        return 0;
  73}
  74
  75static void micro_ts_close(struct input_dev *input)
  76{
  77        struct touchscreen_data *ts = input_get_drvdata(input);
  78
  79        micro_ts_toggle_receive(ts, false);
  80}
  81
  82static int micro_ts_probe(struct platform_device *pdev)
  83{
  84        struct ipaq_micro *micro = dev_get_drvdata(pdev->dev.parent);
  85        struct touchscreen_data *ts;
  86        int error;
  87
  88        ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL);
  89        if (!ts)
  90                return -ENOMEM;
  91
  92        ts->micro = micro;
  93
  94        ts->input = devm_input_allocate_device(&pdev->dev);
  95        if (!ts->input) {
  96                dev_err(&pdev->dev, "failed to allocate input device\n");
  97                return -ENOMEM;
  98        }
  99
 100        ts->input->name = "ipaq micro ts";
 101        ts->input->open = micro_ts_open;
 102        ts->input->close = micro_ts_close;
 103
 104        input_set_drvdata(ts->input, ts);
 105
 106        input_set_capability(ts->input, EV_KEY, BTN_TOUCH);
 107        input_set_capability(ts->input, EV_ABS, ABS_X);
 108        input_set_capability(ts->input, EV_ABS, ABS_Y);
 109        input_set_abs_params(ts->input, ABS_X, 0, 1023, 0, 0);
 110        input_set_abs_params(ts->input, ABS_Y, 0, 1023, 0, 0);
 111
 112        error = input_register_device(ts->input);
 113        if (error) {
 114                dev_err(&pdev->dev, "error registering touch input\n");
 115                return error;
 116        }
 117
 118        platform_set_drvdata(pdev, ts);
 119
 120        dev_info(&pdev->dev, "iPAQ micro touchscreen\n");
 121
 122        return 0;
 123}
 124
 125static int __maybe_unused micro_ts_suspend(struct device *dev)
 126{
 127        struct touchscreen_data *ts = dev_get_drvdata(dev);
 128
 129        micro_ts_toggle_receive(ts, false);
 130
 131        return 0;
 132}
 133
 134static int __maybe_unused micro_ts_resume(struct device *dev)
 135{
 136        struct touchscreen_data *ts = dev_get_drvdata(dev);
 137        struct input_dev *input = ts->input;
 138
 139        mutex_lock(&input->mutex);
 140
 141        if (input->users)
 142                micro_ts_toggle_receive(ts, true);
 143
 144        mutex_unlock(&input->mutex);
 145
 146        return 0;
 147}
 148
 149static const struct dev_pm_ops micro_ts_dev_pm_ops = {
 150        SET_SYSTEM_SLEEP_PM_OPS(micro_ts_suspend, micro_ts_resume)
 151};
 152
 153static struct platform_driver micro_ts_device_driver = {
 154        .driver = {
 155                .name   = "ipaq-micro-ts",
 156                .pm     = &micro_ts_dev_pm_ops,
 157        },
 158        .probe  = micro_ts_probe,
 159};
 160module_platform_driver(micro_ts_device_driver);
 161
 162MODULE_LICENSE("GPL");
 163MODULE_DESCRIPTION("driver for iPAQ Atmel micro touchscreen");
 164MODULE_ALIAS("platform:ipaq-micro-ts");
 165
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