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Linux/drivers/input/touchscreen/hampshire.c

  1 /*
  2  * Hampshire serial touchscreen driver
  3  *
  4  * Copyright (c) 2010 Adam Bennett
  5  * Based on the dynapro driver (c) Tias Guns
  6  *
  7  */
  8 
  9 /*
 10  * This program is free software; you can redistribute it and/or modify it
 11  * under the terms of the GNU General Public License version 2 as published by
 12  * the Free Software Foundation.
 13  */
 14 
 15 /*
 16  * 2010/04/08 Adam Bennett <abennett72@gmail.com>
 17  *   Copied dynapro.c and edited for Hampshire 4-byte protocol
 18  */
 19 
 20 #include <linux/errno.h>
 21 #include <linux/kernel.h>
 22 #include <linux/module.h>
 23 #include <linux/slab.h>
 24 #include <linux/input.h>
 25 #include <linux/serio.h>
 26 
 27 #define DRIVER_DESC     "Hampshire serial touchscreen driver"
 28 
 29 MODULE_AUTHOR("Adam Bennett <abennett72@gmail.com>");
 30 MODULE_DESCRIPTION(DRIVER_DESC);
 31 MODULE_LICENSE("GPL");
 32 
 33 /*
 34  * Definitions & global arrays.
 35  */
 36 
 37 #define HAMPSHIRE_FORMAT_TOUCH_BIT 0x40
 38 #define HAMPSHIRE_FORMAT_LENGTH 4
 39 #define HAMPSHIRE_RESPONSE_BEGIN_BYTE 0x80
 40 
 41 #define HAMPSHIRE_MIN_XC 0
 42 #define HAMPSHIRE_MAX_XC 0x1000
 43 #define HAMPSHIRE_MIN_YC 0
 44 #define HAMPSHIRE_MAX_YC 0x1000
 45 
 46 #define HAMPSHIRE_GET_XC(data) (((data[3] & 0x0c) >> 2) | (data[1] << 2) | ((data[0] & 0x38) << 6))
 47 #define HAMPSHIRE_GET_YC(data) ((data[3] & 0x03) | (data[2] << 2) | ((data[0] & 0x07) << 9))
 48 #define HAMPSHIRE_GET_TOUCHED(data) (HAMPSHIRE_FORMAT_TOUCH_BIT & data[0])
 49 
 50 /*
 51  * Per-touchscreen data.
 52  */
 53 
 54 struct hampshire {
 55         struct input_dev *dev;
 56         struct serio *serio;
 57         int idx;
 58         unsigned char data[HAMPSHIRE_FORMAT_LENGTH];
 59         char phys[32];
 60 };
 61 
 62 static void hampshire_process_data(struct hampshire *phampshire)
 63 {
 64         struct input_dev *dev = phampshire->dev;
 65 
 66         if (HAMPSHIRE_FORMAT_LENGTH == ++phampshire->idx) {
 67                 input_report_abs(dev, ABS_X, HAMPSHIRE_GET_XC(phampshire->data));
 68                 input_report_abs(dev, ABS_Y, HAMPSHIRE_GET_YC(phampshire->data));
 69                 input_report_key(dev, BTN_TOUCH,
 70                                  HAMPSHIRE_GET_TOUCHED(phampshire->data));
 71                 input_sync(dev);
 72 
 73                 phampshire->idx = 0;
 74         }
 75 }
 76 
 77 static irqreturn_t hampshire_interrupt(struct serio *serio,
 78                 unsigned char data, unsigned int flags)
 79 {
 80         struct hampshire *phampshire = serio_get_drvdata(serio);
 81 
 82         phampshire->data[phampshire->idx] = data;
 83 
 84         if (HAMPSHIRE_RESPONSE_BEGIN_BYTE & phampshire->data[0])
 85                 hampshire_process_data(phampshire);
 86         else
 87                 dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
 88                         phampshire->data[0]);
 89 
 90         return IRQ_HANDLED;
 91 }
 92 
 93 static void hampshire_disconnect(struct serio *serio)
 94 {
 95         struct hampshire *phampshire = serio_get_drvdata(serio);
 96 
 97         input_get_device(phampshire->dev);
 98         input_unregister_device(phampshire->dev);
 99         serio_close(serio);
100         serio_set_drvdata(serio, NULL);
101         input_put_device(phampshire->dev);
102         kfree(phampshire);
103 }
104 
105 /*
106  * hampshire_connect() is the routine that is called when someone adds a
107  * new serio device that supports hampshire protocol and registers it as
108  * an input device. This is usually accomplished using inputattach.
109  */
110 
111 static int hampshire_connect(struct serio *serio, struct serio_driver *drv)
112 {
113         struct hampshire *phampshire;
114         struct input_dev *input_dev;
115         int err;
116 
117         phampshire = kzalloc(sizeof(struct hampshire), GFP_KERNEL);
118         input_dev = input_allocate_device();
119         if (!phampshire || !input_dev) {
120                 err = -ENOMEM;
121                 goto fail1;
122         }
123 
124         phampshire->serio = serio;
125         phampshire->dev = input_dev;
126         snprintf(phampshire->phys, sizeof(phampshire->phys),
127                  "%s/input0", serio->phys);
128 
129         input_dev->name = "Hampshire Serial TouchScreen";
130         input_dev->phys = phampshire->phys;
131         input_dev->id.bustype = BUS_RS232;
132         input_dev->id.vendor = SERIO_HAMPSHIRE;
133         input_dev->id.product = 0;
134         input_dev->id.version = 0x0001;
135         input_dev->dev.parent = &serio->dev;
136         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
137         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
138         input_set_abs_params(phampshire->dev, ABS_X,
139                              HAMPSHIRE_MIN_XC, HAMPSHIRE_MAX_XC, 0, 0);
140         input_set_abs_params(phampshire->dev, ABS_Y,
141                              HAMPSHIRE_MIN_YC, HAMPSHIRE_MAX_YC, 0, 0);
142 
143         serio_set_drvdata(serio, phampshire);
144 
145         err = serio_open(serio, drv);
146         if (err)
147                 goto fail2;
148 
149         err = input_register_device(phampshire->dev);
150         if (err)
151                 goto fail3;
152 
153         return 0;
154 
155  fail3: serio_close(serio);
156  fail2: serio_set_drvdata(serio, NULL);
157  fail1: input_free_device(input_dev);
158         kfree(phampshire);
159         return err;
160 }
161 
162 /*
163  * The serio driver structure.
164  */
165 
166 static struct serio_device_id hampshire_serio_ids[] = {
167         {
168                 .type   = SERIO_RS232,
169                 .proto  = SERIO_HAMPSHIRE,
170                 .id     = SERIO_ANY,
171                 .extra  = SERIO_ANY,
172         },
173         { 0 }
174 };
175 
176 MODULE_DEVICE_TABLE(serio, hampshire_serio_ids);
177 
178 static struct serio_driver hampshire_drv = {
179         .driver         = {
180                 .name   = "hampshire",
181         },
182         .description    = DRIVER_DESC,
183         .id_table       = hampshire_serio_ids,
184         .interrupt      = hampshire_interrupt,
185         .connect        = hampshire_connect,
186         .disconnect     = hampshire_disconnect,
187 };
188 
189 module_serio_driver(hampshire_drv);
190 

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