drivers/input/touchscreen/ipaq-micro-ts.c

   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
  25 struct touchscreen_data {
  26         struct input_dev *input;
  27         struct ipaq_micro *micro;
  28 };
  29
  30 static 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
  49 static 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
  66 static 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
  75 static 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
  82 static 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
 125 static 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
 134 static 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
 149 static const struct dev_pm_ops micro_ts_dev_pm_ops = {
 150         SET_SYSTEM_SLEEP_PM_OPS(micro_ts_suspend, micro_ts_resume)
 151 };
 152
 153 static 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 };
 160 module_platform_driver(micro_ts_device_driver);
 161
 162 MODULE_LICENSE("GPL");
 163 MODULE_DESCRIPTION("driver for iPAQ Atmel micro touchscreen");
 164 MODULE_ALIAS("platform:ipaq-micro-ts");