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Linux/drivers/input/touchscreen/dynapro.c

  1 /*
  2  * Dynapro serial touchscreen driver
  3  *
  4  * Copyright (c) 2009 Tias Guns
  5  * Based on the inexio driver (c) Vojtech Pavlik and Dan Streetman and
  6  * Richard Lemon
  7  *
  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 by
 13  * the Free Software Foundation.
 14  */
 15 
 16 /*
 17  * 2009/09/19 Tias Guns <tias@ulyssis.org>
 18  *   Copied inexio.c and edited for Dynapro protocol (from retired Xorg module)
 19  */
 20 
 21 #include <linux/errno.h>
 22 #include <linux/kernel.h>
 23 #include <linux/module.h>
 24 #include <linux/slab.h>
 25 #include <linux/input.h>
 26 #include <linux/serio.h>
 27 
 28 #define DRIVER_DESC     "Dynapro serial touchscreen driver"
 29 
 30 MODULE_AUTHOR("Tias Guns <tias@ulyssis.org>");
 31 MODULE_DESCRIPTION(DRIVER_DESC);
 32 MODULE_LICENSE("GPL");
 33 
 34 /*
 35  * Definitions & global arrays.
 36  */
 37 
 38 #define DYNAPRO_FORMAT_TOUCH_BIT 0x40
 39 #define DYNAPRO_FORMAT_LENGTH 3
 40 #define DYNAPRO_RESPONSE_BEGIN_BYTE 0x80
 41 
 42 #define DYNAPRO_MIN_XC 0
 43 #define DYNAPRO_MAX_XC 0x3ff
 44 #define DYNAPRO_MIN_YC 0
 45 #define DYNAPRO_MAX_YC 0x3ff
 46 
 47 #define DYNAPRO_GET_XC(data) (data[1] | ((data[0] & 0x38) << 4))
 48 #define DYNAPRO_GET_YC(data) (data[2] | ((data[0] & 0x07) << 7))
 49 #define DYNAPRO_GET_TOUCHED(data) (DYNAPRO_FORMAT_TOUCH_BIT & data[0])
 50 
 51 /*
 52  * Per-touchscreen data.
 53  */
 54 
 55 struct dynapro {
 56         struct input_dev *dev;
 57         struct serio *serio;
 58         int idx;
 59         unsigned char data[DYNAPRO_FORMAT_LENGTH];
 60         char phys[32];
 61 };
 62 
 63 static void dynapro_process_data(struct dynapro *pdynapro)
 64 {
 65         struct input_dev *dev = pdynapro->dev;
 66 
 67         if (DYNAPRO_FORMAT_LENGTH == ++pdynapro->idx) {
 68                 input_report_abs(dev, ABS_X, DYNAPRO_GET_XC(pdynapro->data));
 69                 input_report_abs(dev, ABS_Y, DYNAPRO_GET_YC(pdynapro->data));
 70                 input_report_key(dev, BTN_TOUCH,
 71                                  DYNAPRO_GET_TOUCHED(pdynapro->data));
 72                 input_sync(dev);
 73 
 74                 pdynapro->idx = 0;
 75         }
 76 }
 77 
 78 static irqreturn_t dynapro_interrupt(struct serio *serio,
 79                 unsigned char data, unsigned int flags)
 80 {
 81         struct dynapro *pdynapro = serio_get_drvdata(serio);
 82 
 83         pdynapro->data[pdynapro->idx] = data;
 84 
 85         if (DYNAPRO_RESPONSE_BEGIN_BYTE & pdynapro->data[0])
 86                 dynapro_process_data(pdynapro);
 87         else
 88                 dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
 89                         pdynapro->data[0]);
 90 
 91         return IRQ_HANDLED;
 92 }
 93 
 94 static void dynapro_disconnect(struct serio *serio)
 95 {
 96         struct dynapro *pdynapro = serio_get_drvdata(serio);
 97 
 98         input_get_device(pdynapro->dev);
 99         input_unregister_device(pdynapro->dev);
100         serio_close(serio);
101         serio_set_drvdata(serio, NULL);
102         input_put_device(pdynapro->dev);
103         kfree(pdynapro);
104 }
105 
106 /*
107  * dynapro_connect() is the routine that is called when someone adds a
108  * new serio device that supports dynapro protocol and registers it as
109  * an input device. This is usually accomplished using inputattach.
110  */
111 
112 static int dynapro_connect(struct serio *serio, struct serio_driver *drv)
113 {
114         struct dynapro *pdynapro;
115         struct input_dev *input_dev;
116         int err;
117 
118         pdynapro = kzalloc(sizeof(struct dynapro), GFP_KERNEL);
119         input_dev = input_allocate_device();
120         if (!pdynapro || !input_dev) {
121                 err = -ENOMEM;
122                 goto fail1;
123         }
124 
125         pdynapro->serio = serio;
126         pdynapro->dev = input_dev;
127         snprintf(pdynapro->phys, sizeof(pdynapro->phys),
128                  "%s/input0", serio->phys);
129 
130         input_dev->name = "Dynapro Serial TouchScreen";
131         input_dev->phys = pdynapro->phys;
132         input_dev->id.bustype = BUS_RS232;
133         input_dev->id.vendor = SERIO_DYNAPRO;
134         input_dev->id.product = 0;
135         input_dev->id.version = 0x0001;
136         input_dev->dev.parent = &serio->dev;
137         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
138         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
139         input_set_abs_params(pdynapro->dev, ABS_X,
140                              DYNAPRO_MIN_XC, DYNAPRO_MAX_XC, 0, 0);
141         input_set_abs_params(pdynapro->dev, ABS_Y,
142                              DYNAPRO_MIN_YC, DYNAPRO_MAX_YC, 0, 0);
143 
144         serio_set_drvdata(serio, pdynapro);
145 
146         err = serio_open(serio, drv);
147         if (err)
148                 goto fail2;
149 
150         err = input_register_device(pdynapro->dev);
151         if (err)
152                 goto fail3;
153 
154         return 0;
155 
156  fail3: serio_close(serio);
157  fail2: serio_set_drvdata(serio, NULL);
158  fail1: input_free_device(input_dev);
159         kfree(pdynapro);
160         return err;
161 }
162 
163 /*
164  * The serio driver structure.
165  */
166 
167 static struct serio_device_id dynapro_serio_ids[] = {
168         {
169                 .type   = SERIO_RS232,
170                 .proto  = SERIO_DYNAPRO,
171                 .id     = SERIO_ANY,
172                 .extra  = SERIO_ANY,
173         },
174         { 0 }
175 };
176 
177 MODULE_DEVICE_TABLE(serio, dynapro_serio_ids);
178 
179 static struct serio_driver dynapro_drv = {
180         .driver         = {
181                 .name   = "dynapro",
182         },
183         .description    = DRIVER_DESC,
184         .id_table       = dynapro_serio_ids,
185         .interrupt      = dynapro_interrupt,
186         .connect        = dynapro_connect,
187         .disconnect     = dynapro_disconnect,
188 };
189 
190 module_serio_driver(dynapro_drv);
191 

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