drivers/input/touchscreen/h3600_ts_input.c

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