drivers/input/touchscreen/h3600_ts_input.c

   1 /*
   2  * $Id: h3600_ts_input.c,v 1.4 2002/01/23 06:39:37 jsimmons Exp $
   3  *
   4  *  Copyright (c) 2001 "Crazy" James Simmons jsimmons@transvirtual.com
   5  *
   6  *  Sponsored by Transvirtual Technology.
   7  *
   8  *  Derived from the code in h3600_ts.[ch] by Charles Flynn
   9  */
  10
  11 /*
  12  * Driver for the h3600 Touch Screen and other Atmel controlled devices.
  13  */
  14
  15 /*
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2 of the License, or
  19  * (at your option) any later version.
  20  *
  21  * This program is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  * GNU General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU General Public License
  27  * along with this program; if not, write to the Free Software
  28  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  29  *
  30  * Should you need to contact me, the author, you can do so by
  31  * e-mail - mail your message to <jsimmons@transvirtual.com>.
  32  */
  33
  34 #include <linux/errno.h>
  35 #include <linux/kernel.h>
  36 #include <linux/module.h>
  37 #include <linux/slab.h>
  38 #include <linux/input.h>
  39 #include <linux/serio.h>
  40 #include <linux/init.h>
  41 #include <linux/delay.h>
  42
  43 /* SA1100 serial defines */
  44 #include <asm/arch/hardware.h>
  45 #include <asm/arch/irqs.h>
  46
  47 #define DRIVER_DESC     "H3600 touchscreen driver"
  48
  49 MODULE_AUTHOR("James Simmons <jsimmons@transvirtual.com>");
  50 MODULE_DESCRIPTION(DRIVER_DESC);
  51 MODULE_LICENSE("GPL");
  52
  53 /*
  54  * Definitions & global arrays.
  55  */
  56
  57 /* The start and end of frame characters SOF and EOF */
  58 #define CHAR_SOF                0x02
  59 #define CHAR_EOF                0x03
  60 #define FRAME_OVERHEAD          3       /* CHAR_SOF,CHAR_EOF,LENGTH = 3 */
  61
  62 /*
  63         Atmel events and response IDs contained in frame.
  64         Programmer has no control over these numbers.
  65         TODO there are holes - specifically  1,7,0x0a
  66 */
  67 #define VERSION_ID              0       /* Get Version (request/respose) */
  68 #define KEYBD_ID                2       /* Keyboard (event) */
  69 #define TOUCHS_ID               3       /* Touch Screen (event)*/
  70 #define EEPROM_READ_ID          4       /* (request/response) */
  71 #define EEPROM_WRITE_ID         5       /* (request/response) */
  72 #define THERMAL_ID              6       /* (request/response) */
  73 #define NOTIFY_LED_ID           8       /* (request/response) */
  74 #define BATTERY_ID              9       /* (request/response) */
  75 #define SPI_READ_ID             0x0b    /* ( request/response) */
  76 #define SPI_WRITE_ID            0x0c    /* ( request/response) */
  77 #define FLITE_ID                0x0d    /* backlight ( request/response) */
  78 #define STX_ID                  0xa1    /* extension pack status (req/resp) */
  79
  80 #define MAX_ID                  14
  81
  82 #define H3600_MAX_LENGTH 16
  83 #define H3600_KEY 0xf
  84
  85 #define H3600_SCANCODE_RECORD   1        /* 1 -> record button */
  86 #define H3600_SCANCODE_CALENDAR 2        /* 2 -> calendar */
  87 #define H3600_SCANCODE_CONTACTS 3        /* 3 -> contact */
  88 #define H3600_SCANCODE_Q        4        /* 4 -> Q button */
  89 #define H3600_SCANCODE_START    5        /* 5 -> start menu */
  90 #define H3600_SCANCODE_UP       6        /* 6 -> up */
  91 #define H3600_SCANCODE_RIGHT    7        /* 7 -> right */
  92 #define H3600_SCANCODE_LEFT     8        /* 8 -> left */
  93 #define H3600_SCANCODE_DOWN     9        /* 9 -> down */
  94
  95 /*
  96  * Per-touchscreen data.
  97  */
  98 struct h3600_dev {
  99         struct input_dev *dev;
 100         struct serio *serio;
 101         unsigned char event;    /* event ID from packet */
 102         unsigned char chksum;
 103         unsigned char len;
 104         unsigned char idx;
 105         unsigned char buf[H3600_MAX_LENGTH];
 106         char phys[32];
 107 };
 108
 109 static irqreturn_t action_button_handler(int irq, void *dev_id, struct pt_regs *regs)
 110 {
 111         int down = (GPLR & GPIO_BITSY_ACTION_BUTTON) ? 0 : 1;
 112         struct input_dev *dev = (struct input_dev *) dev_id;
 113
 114         input_regs(dev, regs);
 115         input_report_key(dev, KEY_ENTER, down);
 116         input_sync(dev);
 117
 118         return IRQ_HANDLED;
 119 }
 120
 121 static irqreturn_t npower_button_handler(int irq, void *dev_id, struct pt_regs *regs)
 122 {
 123         int down = (GPLR & GPIO_BITSY_NPOWER_BUTTON) ? 0 : 1;
 124         struct input_dev *dev = (struct input_dev *) dev_id;
 125
 126         /*
 127          * This interrupt is only called when we release the key. So we have
 128          * to fake a key press.
 129          */
 130         input_regs(dev, regs);
 131         input_report_key(dev, KEY_SUSPEND, 1);
 132         input_report_key(dev, KEY_SUSPEND, down);
 133         input_sync(dev);
 134
 135         return IRQ_HANDLED;
 136 }
 137
 138 #ifdef CONFIG_PM
 139
 140 static int flite_brightness = 25;
 141
 142 enum flite_pwr {
 143         FLITE_PWR_OFF = 0,
 144         FLITE_PWR_ON = 1
 145 };
 146
 147 /*
 148  * h3600_flite_power: enables or disables power to frontlight, using last bright */
 149 unsigned int h3600_flite_power(struct input_dev *dev, enum flite_pwr pwr)
 150 {
 151         unsigned char brightness = (pwr == FLITE_PWR_OFF) ? 0 : flite_brightness;
 152         struct h3600_dev *ts = dev->private;
 153
 154         /* Must be in this order */
 155         ts->serio->write(ts->serio, 1);
 156         ts->serio->write(ts->serio, pwr);
 157         ts->serio->write(ts->serio, brightness);
 158         return 0;
 159 }
 160
 161 #endif
 162
 163 /*
 164  * This function translates the native event packets to linux input event
 165  * packets. Some packets coming from serial are not touchscreen related. In
 166  * this case we send them off to be processed elsewhere.
 167  */
 168 static void h3600ts_process_packet(struct h3600_dev *ts, struct pt_regs *regs)
 169 {
 170         struct input_dev *dev = ts->dev;
 171         static int touched = 0;
 172         int key, down = 0;
 173
 174         input_regs(dev, regs);
 175
 176         switch (ts->event) {
 177                 /*
 178                    Buttons - returned as a single byte
 179                         7 6 5 4 3 2 1 0
 180                         S x x x N N N N
 181
 182                    S       switch state ( 0=pressed 1=released)
 183                    x       Unused.
 184                    NNNN    switch number 0-15
 185
 186                    Note: This is true for non interrupt generated key events.
 187                 */
 188                 case KEYBD_ID:
 189                         down = (ts->buf[0] & 0x80) ? 0 : 1;
 190
 191                         switch (ts->buf[0] & 0x7f) {
 192                                 case H3600_SCANCODE_RECORD:
 193                                         key = KEY_RECORD;
 194                                         break;
 195                                 case H3600_SCANCODE_CALENDAR:
 196                                         key = KEY_PROG1;
 197                                         break;
 198                                 case H3600_SCANCODE_CONTACTS:
 199                                         key = KEY_PROG2;
 200                                         break;
 201                                 case H3600_SCANCODE_Q:
 202                                         key = KEY_Q;
 203                                         break;
 204                                 case H3600_SCANCODE_START:
 205                                         key = KEY_PROG3;
 206                                         break;
 207                                 case H3600_SCANCODE_UP:
 208                                         key = KEY_UP;
 209                                         break;
 210                                 case H3600_SCANCODE_RIGHT:
 211                                         key = KEY_RIGHT;
 212                                         break;
 213                                 case H3600_SCANCODE_LEFT:
 214                                         key = KEY_LEFT;
 215                                         break;
 216                                 case H3600_SCANCODE_DOWN:
 217                                         key = KEY_DOWN;
 218                                         break;
 219                                 default:
 220                                         key = 0;
 221                         }
 222                         if (key)
 223                                 input_report_key(dev, key, down);
 224                         break;
 225                 /*
 226                  * Native touchscreen event data is formatted as shown below:-
 227                  *
 228                  *      +-------+-------+-------+-------+
 229                  *      | Xmsb  | Xlsb  | Ymsb  | Ylsb  |
 230                  *      +-------+-------+-------+-------+
 231                  *       byte 0    1       2       3
 232                  */
 233                 case TOUCHS_ID:
 234                         if (!touched) {
 235                                 input_report_key(dev, BTN_TOUCH, 1);
 236                                 touched = 1;
 237                         }
 238
 239                         if (ts->len) {
 240                                 unsigned short x, y;
 241
 242                                 x = ts->buf[0]; x <<= 8; x += ts->buf[1];
 243                                 y = ts->buf[2]; y <<= 8; y += ts->buf[3];
 244
 245                                 input_report_abs(dev, ABS_X, x);
 246                                 input_report_abs(dev, ABS_Y, y);
 247                         } else {
 248                                 input_report_key(dev, BTN_TOUCH, 0);
 249                                 touched = 0;
 250                         }
 251                         break;
 252                 default:
 253                         /* Send a non input event elsewhere */
 254                         break;
 255         }
 256
 257         input_sync(dev);
 258 }
 259
 260 /*
 261  * h3600ts_event() handles events from the input module.
 262  */
 263 static int h3600ts_event(struct input_dev *dev, unsigned int type,
 264                          unsigned int code, int value)
 265 {
 266 #if 0
 267         struct h3600_dev *ts = dev->private;
 268
 269         switch (type) {
 270                 case EV_LED: {
 271                 //      ts->serio->write(ts->serio, SOME_CMD);
 272                         return 0;
 273                 }
 274         }
 275         return -1;
 276 #endif
 277         return 0;
 278 }
 279
 280 /*
 281         Frame format
 282   byte    1       2               3              len + 4
 283         +-------+---------------+---------------+--=------------+
 284         |SOF    |id     |len    | len bytes     | Chksum        |
 285         +-------+---------------+---------------+--=------------+
 286   bit   0     7  8    11 12   15 16
 287
 288         +-------+---------------+-------+
 289         |SOF    |id     |0      |Chksum | - Note Chksum does not include SOF
 290         +-------+---------------+-------+
 291   bit   0     7  8    11 12   15 16
 292
 293 */
 294
 295 static int state;
 296
 297 /* decode States  */
 298 #define STATE_SOF       0       /* start of FRAME */
 299 #define STATE_ID        1       /* state where we decode the ID & len */
 300 #define STATE_DATA      2       /* state where we decode data */
 301 #define STATE_EOF       3       /* state where we decode checksum or EOF */
 302
 303 static irqreturn_t h3600ts_interrupt(struct serio *serio, unsigned char data,
 304                                      unsigned int flags, struct pt_regs *regs)
 305 {
 306         struct h3600_dev *ts = serio_get_drvdata(serio);
 307
 308         /*
 309          * We have a new frame coming in.
 310          */
 311         switch (state) {
 312                 case STATE_SOF:
 313                         if (data == CHAR_SOF)
 314                                 state = STATE_ID;
 315                         break;
 316                 case STATE_ID:
 317                         ts->event = (data & 0xf0) >> 4;
 318                         ts->len = (data & 0xf);
 319                         ts->idx = 0;
 320                         if (ts->event >= MAX_ID) {
 321                                 state = STATE_SOF;
 322                                 break;
 323                         }
 324                         ts->chksum = data;
 325                         state = (ts->len > 0) ? STATE_DATA : STATE_EOF;
 326                         break;
 327                 case STATE_DATA:
 328                         ts->chksum += data;
 329                         ts->buf[ts->idx]= data;
 330                         if (++ts->idx == ts->len)
 331                                 state = STATE_EOF;
 332                         break;
 333                 case STATE_EOF:
 334                         state = STATE_SOF;
 335                         if (data == CHAR_EOF || data == ts->chksum)
 336                                 h3600ts_process_packet(ts, regs);
 337                         break;
 338                 default:
 339                         printk("Error3\n");
 340                         break;
 341         }
 342
 343         return IRQ_HANDLED;
 344 }
 345
 346 /*
 347  * h3600ts_connect() is the routine that is called when someone adds a
 348  * new serio device that supports H3600 protocol and registers it as
 349  * an input device.
 350  */
 351 static int h3600ts_connect(struct serio *serio, struct serio_driver *drv)
 352 {
 353         struct h3600_dev *ts;
 354         struct input_dev *input_dev;
 355         int err;
 356
 357         ts = kzalloc(sizeof(struct h3600_dev), GFP_KERNEL);
 358         input_dev = input_allocate_device();
 359         if (!ts || !input_dev) {
 360                 err = -ENOMEM;
 361                 goto fail1;
 362         }
 363
 364         ts->serio = serio;
 365         ts->dev = input_dev;
 366         sprintf(ts->phys, "%s/input0", serio->phys);
 367
 368         input_dev->name = "H3600 TouchScreen";
 369         input_dev->phys = ts->phys;
 370         input_dev->id.bustype = BUS_RS232;
 371         input_dev->id.vendor = SERIO_H3600;
 372         input_dev->id.product = 0x0666;  /* FIXME !!! We can ask the hardware */
 373         input_dev->id.version = 0x0100;
 374         input_dev->cdev.dev = &serio->dev;
 375         input_dev->private = ts;
 376
 377         input_dev->event = h3600ts_event;
 378
 379         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_LED) | BIT(EV_PWR);
 380         input_dev->ledbit[0] = BIT(LED_SLEEP);
 381         input_set_abs_params(input_dev, ABS_X, 60, 985, 0, 0);
 382         input_set_abs_params(input_dev, ABS_Y, 35, 1024, 0, 0);
 383
 384         set_bit(KEY_RECORD, input_dev->keybit);
 385         set_bit(KEY_Q, input_dev->keybit);
 386         set_bit(KEY_PROG1, input_dev->keybit);
 387         set_bit(KEY_PROG2, input_dev->keybit);
 388         set_bit(KEY_PROG3, input_dev->keybit);
 389         set_bit(KEY_UP, input_dev->keybit);
 390         set_bit(KEY_RIGHT, input_dev->keybit);
 391         set_bit(KEY_LEFT, input_dev->keybit);
 392         set_bit(KEY_DOWN, input_dev->keybit);
 393         set_bit(KEY_ENTER, input_dev->keybit);
 394         set_bit(KEY_SUSPEND, input_dev->keybit);
 395         set_bit(BTN_TOUCH, input_dev->keybit);
 396
 397         /* Device specific stuff */
 398         set_GPIO_IRQ_edge(GPIO_BITSY_ACTION_BUTTON, GPIO_BOTH_EDGES);
 399         set_GPIO_IRQ_edge(GPIO_BITSY_NPOWER_BUTTON, GPIO_RISING_EDGE);
 400
 401         if (request_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, action_button_handler,
 402                         SA_SHIRQ | SA_INTERRUPT | SA_SAMPLE_RANDOM,
 403                         "h3600_action", &ts->dev)) {
 404                 printk(KERN_ERR "h3600ts.c: Could not allocate Action Button IRQ!\n");
 405                 err = -EBUSY;
 406                 goto fail2;
 407         }
 408
 409         if (request_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, npower_button_handler,
 410                         SA_SHIRQ | SA_INTERRUPT | SA_SAMPLE_RANDOM,
 411                         "h3600_suspend", &ts->dev)) {
 412                 printk(KERN_ERR "h3600ts.c: Could not allocate Power Button IRQ!\n");
 413                 err = -EBUSY;
 414                 goto fail3;
 415         }
 416
 417         serio_set_drvdata(serio, ts);
 418
 419         err = serio_open(serio, drv);
 420         if (err)
 421                 return err;
 422
 423         //h3600_flite_control(1, 25);     /* default brightness */
 424         input_register_device(ts->dev);
 425
 426         return 0;
 427
 428 fail3:  free_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, ts->dev);
 429 fail2:  free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, ts->dev);
 430 fail1:  serio_set_drvdata(serio, NULL);
 431         input_free_device(input_dev);
 432         kfree(ts);
 433         return err;
 434 }
 435
 436 /*
 437  * h3600ts_disconnect() is the opposite of h3600ts_connect()
 438  */
 439
 440 static void h3600ts_disconnect(struct serio *serio)
 441 {
 442         struct h3600_dev *ts = serio_get_drvdata(serio);
 443
 444         free_irq(IRQ_GPIO_BITSY_ACTION_BUTTON, &ts->dev);
 445         free_irq(IRQ_GPIO_BITSY_NPOWER_BUTTON, &ts->dev);
 446         input_get_device(ts->dev);
 447         input_unregister_device(ts->dev);
 448         serio_close(serio);
 449         serio_set_drvdata(serio, NULL);
 450         input_put_device(ts->dev);
 451         kfree(ts);
 452 }
 453
 454 /*
 455  * The serio driver structure.
 456  */
 457
 458 static struct serio_device_id h3600ts_serio_ids[] = {
 459         {
 460                 .type   = SERIO_RS232,
 461                 .proto  = SERIO_H3600,
 462                 .id     = SERIO_ANY,
 463                 .extra  = SERIO_ANY,
 464         },
 465         { 0 }
 466 };
 467
 468 MODULE_DEVICE_TABLE(serio, h3600ts_serio_ids);
 469
 470 static struct serio_driver h3600ts_drv = {
 471         .driver         = {
 472                 .name   = "h3600ts",
 473         },
 474         .description    = DRIVER_DESC,
 475         .id_table       = h3600ts_serio_ids,
 476         .interrupt      = h3600ts_interrupt,
 477         .connect        = h3600ts_connect,
 478         .disconnect     = h3600ts_disconnect,
 479 };
 480
 481 /*
 482  * The functions for inserting/removing us as a module.
 483  */
 484
 485 static int __init h3600ts_init(void)
 486 {
 487         serio_register_driver(&h3600ts_drv);
 488         return 0;
 489 }
 490
 491 static void __exit h3600ts_exit(void)
 492 {
 493         serio_unregister_driver(&h3600ts_drv);
 494 }
 495
 496 module_init(h3600ts_init);
 497 module_exit(h3600ts_exit);