drivers/input/touchscreen/penmount.c

   1 /*
   2  * Penmount serial touchscreen driver
   3  *
   4  * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
   5  *
   6  * Based on ELO driver (drivers/input/touchscreen/elo.c)
   7  * Copyright (c) 2004 Vojtech Pavlik
   8  */
   9
  10 /*
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms of the GNU General Public License version 2 as published
  13  * by the Free Software Foundation.
  14  */
  15
  16 #include <linux/errno.h>
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/slab.h>
  20 #include <linux/input.h>
  21 #include <linux/serio.h>
  22 #include <linux/init.h>
  23
  24 #define DRIVER_DESC     "Penmount serial touchscreen driver"
  25
  26 MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
  27 MODULE_DESCRIPTION(DRIVER_DESC);
  28 MODULE_LICENSE("GPL");
  29
  30 /*
  31  * Definitions & global arrays.
  32  */
  33
  34 #define PM_MAX_LENGTH   5
  35
  36 /*
  37  * Per-touchscreen data.
  38  */
  39
  40 struct pm {
  41         struct input_dev *dev;
  42         struct serio *serio;
  43         int idx;
  44         unsigned char data[PM_MAX_LENGTH];
  45         char phys[32];
  46 };
  47
  48 static irqreturn_t pm_interrupt(struct serio *serio,
  49                 unsigned char data, unsigned int flags)
  50 {
  51         struct pm *pm = serio_get_drvdata(serio);
  52         struct input_dev *dev = pm->dev;
  53
  54         pm->data[pm->idx] = data;
  55
  56         if (pm->data[0] & 0x80) {
  57                 if (PM_MAX_LENGTH == ++pm->idx) {
  58                         input_report_abs(dev, ABS_X, pm->data[2] * 128 + pm->data[1]);
  59                         input_report_abs(dev, ABS_Y, pm->data[4] * 128 + pm->data[3]);
  60                         input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40));
  61                         input_sync(dev);
  62                         pm->idx = 0;
  63                 }
  64         }
  65
  66         return IRQ_HANDLED;
  67 }
  68
  69 /*
  70  * pm_disconnect() is the opposite of pm_connect()
  71  */
  72
  73 static void pm_disconnect(struct serio *serio)
  74 {
  75         struct pm *pm = serio_get_drvdata(serio);
  76
  77         input_get_device(pm->dev);
  78         input_unregister_device(pm->dev);
  79         serio_close(serio);
  80         serio_set_drvdata(serio, NULL);
  81         input_put_device(pm->dev);
  82         kfree(pm);
  83 }
  84
  85 /*
  86  * pm_connect() is the routine that is called when someone adds a
  87  * new serio device that supports Gunze protocol and registers it as
  88  * an input device.
  89  */
  90
  91 static int pm_connect(struct serio *serio, struct serio_driver *drv)
  92 {
  93         struct pm *pm;
  94         struct input_dev *input_dev;
  95         int err;
  96
  97         pm = kzalloc(sizeof(struct pm), GFP_KERNEL);
  98         input_dev = input_allocate_device();
  99         if (!pm || !input_dev) {
 100                 err = -ENOMEM;
 101                 goto fail1;
 102         }
 103
 104         pm->serio = serio;
 105         pm->dev = input_dev;
 106         snprintf(pm->phys, sizeof(pm->phys), "%s/input0", serio->phys);
 107
 108         input_dev->private = pm;
 109         input_dev->name = "Penmount Serial TouchScreen";
 110         input_dev->phys = pm->phys;
 111         input_dev->id.bustype = BUS_RS232;
 112         input_dev->id.vendor = SERIO_PENMOUNT;
 113         input_dev->id.product = 0;
 114         input_dev->id.version = 0x0100;
 115         input_dev->cdev.dev = &serio->dev;
 116
 117         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 118         input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
 119         input_set_abs_params(pm->dev, ABS_X, 0, 0x3ff, 0, 0);
 120         input_set_abs_params(pm->dev, ABS_Y, 0, 0x3ff, 0, 0);
 121
 122         serio_set_drvdata(serio, pm);
 123
 124         err = serio_open(serio, drv);
 125         if (err)
 126                 goto fail2;
 127
 128         err = input_register_device(pm->dev);
 129         if (err)
 130                 goto fail3;
 131
 132         return 0;
 133
 134  fail3: serio_close(serio);
 135  fail2: serio_set_drvdata(serio, NULL);
 136  fail1: input_free_device(input_dev);
 137         kfree(pm);
 138         return err;
 139 }
 140
 141 /*
 142  * The serio driver structure.
 143  */
 144
 145 static struct serio_device_id pm_serio_ids[] = {
 146         {
 147                 .type   = SERIO_RS232,
 148                 .proto  = SERIO_PENMOUNT,
 149                 .id     = SERIO_ANY,
 150                 .extra  = SERIO_ANY,
 151         },
 152         { 0 }
 153 };
 154
 155 MODULE_DEVICE_TABLE(serio, pm_serio_ids);
 156
 157 static struct serio_driver pm_drv = {
 158         .driver         = {
 159                 .name   = "penmountlpc",
 160         },
 161         .description    = DRIVER_DESC,
 162         .id_table       = pm_serio_ids,
 163         .interrupt      = pm_interrupt,
 164         .connect        = pm_connect,
 165         .disconnect     = pm_disconnect,
 166 };
 167
 168 /*
 169  * The functions for inserting/removing us as a module.
 170  */
 171
 172 static int __init pm_init(void)
 173 {
 174         return serio_register_driver(&pm_drv);
 175 }
 176
 177 static void __exit pm_exit(void)
 178 {
 179         serio_unregister_driver(&pm_drv);
 180 }
 181
 182 module_init(pm_init);
 183 module_exit(pm_exit);