drivers/char/qtronix.c

   1 /*
   2  *
   3  * BRIEF MODULE DESCRIPTION
   4  *      Qtronix 990P infrared keyboard driver.
   5  *
   6  *
   7  * Copyright 2001 MontaVista Software Inc.
   8  * Author: MontaVista Software, Inc.
   9  *              ppopov@mvista.com or source@mvista.com
  10  *
  11  *
  12  *  The bottom portion of this driver was take from
  13  *  pc_keyb.c  Please see that file for copyrights.
  14  *
  15  *  This program is free software; you can redistribute  it and/or modify it
  16  *  under  the terms of  the GNU General  Public License as published by the
  17  *  Free Software Foundation;  either version 2 of the  License, or (at your
  18  *  option) any later version.
  19  *
  20  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  21  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  22  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  23  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  24  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  26  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  27  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  28  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  29  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  *
  31  *  You should have received a copy of the  GNU General Public License along
  32  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  33  *  675 Mass Ave, Cambridge, MA 02139, USA.
  34  */
  35
  36 #include <linux/config.h>
  37
  38 /*
  39  * NOTE:
  40  *
  41  *      This driver has only been tested with the Consumer IR
  42  *      port of the ITE 8172 system controller.
  43  *
  44  *      You do not need this driver if you are using the ps/2 or
  45  *      USB adapter that the keyboard ships with.  You only need
  46  *      this driver if your board has a IR port and the keyboard
  47  *      data is being sent directly to the IR.  In that case,
  48  *      you also need some low-level IR support. See it8172_cir.c.
  49  *
  50  */
  51
  52 #ifdef CONFIG_QTRONIX_KEYBOARD
  53
  54 #include <linux/module.h>
  55 #include <linux/types.h>
  56 #include <linux/pci.h>
  57 #include <linux/kernel.h>
  58
  59 #include <asm/it8172/it8172.h>
  60 #include <asm/it8172/it8172_int.h>
  61 #include <asm/it8172/it8172_cir.h>
  62
  63 #include <linux/spinlock.h>
  64 #include <linux/sched.h>
  65 #include <linux/interrupt.h>
  66 #include <linux/tty.h>
  67 #include <linux/mm.h>
  68 #include <linux/signal.h>
  69 #include <linux/init.h>
  70 #include <linux/kbd_ll.h>
  71 #include <linux/delay.h>
  72 #include <linux/poll.h>
  73 #include <linux/miscdevice.h>
  74 #include <linux/slab.h>
  75 #include <linux/kbd_kern.h>
  76 #include <linux/smp_lock.h>
  77 #include <asm/io.h>
  78 #include <linux/pc_keyb.h>
  79
  80 #include <asm/keyboard.h>
  81 #include <linux/bitops.h>
  82 #include <asm/uaccess.h>
  83 #include <asm/irq.h>
  84 #include <asm/system.h>
  85
  86 #define leading1 0
  87 #define leading2 0xF
  88
  89 #define KBD_CIR_PORT 0
  90 #define AUX_RECONNECT 170 /* scancode when ps2 device is plugged (back) in */
  91
  92 static int data_index;
  93 struct cir_port *cir;
  94 static unsigned char kbdbytes[5];
  95 static unsigned char cir_data[32]; /* we only need 16 chars */
  96
  97 static void kbd_int_handler(int irq, void *dev_id, struct pt_regs *regs);
  98 static int handle_data(unsigned char *p_data);
  99 static inline void handle_mouse_event(unsigned char scancode);
 100 static inline void handle_keyboard_event(unsigned char scancode, int down);
 101 static int __init psaux_init(void);
 102
 103 static struct aux_queue *queue; /* Mouse data buffer. */
 104 static int aux_count = 0;
 105
 106 /*
 107  * Keys accessed through the 'Fn' key
 108  * The Fn key does not produce a key-up sequence. So, the first
 109  * time the user presses it, it will be key-down event. The key
 110  * stays down until the user presses it again.
 111  */
 112 #define NUM_FN_KEYS 56
 113 static unsigned char fn_keys[NUM_FN_KEYS] = {
 114         0,0,0,0,0,0,0,0,        /* 0 7   */
 115         8,9,10,93,0,0,0,0,      /* 8 15  */
 116         0,0,0,0,0,0,0,5,        /* 16 23 */
 117         6,7,91,0,0,0,0,0,       /* 24 31 */
 118         0,0,0,0,0,2,3,4,        /* 32 39 */
 119         92,0,0,0,0,0,0,0,       /* 40 47 */
 120         0,0,0,0,11,0,94,95        /* 48 55 */
 121
 122 };
 123
 124 void __init init_qtronix_990P_kbd(void)
 125 {
 126         int retval;
 127
 128         cir = (struct cir_port *)kmalloc(sizeof(struct cir_port), GFP_KERNEL);
 129         if (!cir) {
 130                 printk("Unable to initialize Qtronix keyboard\n");
 131                 return;
 132         }
 133
 134         /*
 135          * revisit
 136          * this should be programmable, somehow by the, by the user.
 137          */
 138         cir->port = KBD_CIR_PORT;
 139         cir->baud_rate = 0x1d;
 140         cir->rdwos = 0;
 141         cir->rxdcr = 0x3;
 142         cir->hcfs = 0;
 143         cir->fifo_tl = 0;
 144         cir->cfq = 0x1d;
 145         cir_port_init(cir);
 146
 147         retval = request_irq(IT8172_CIR0_IRQ, kbd_int_handler,
 148                         (unsigned long )(SA_INTERRUPT|SA_SHIRQ),
 149                         (const char *)"Qtronix IR Keyboard", (void *)cir);
 150
 151         if (retval) {
 152                 printk("unable to allocate cir %d irq %d\n",
 153                                 cir->port, IT8172_CIR0_IRQ);
 154         }
 155 #ifdef CONFIG_PSMOUSE
 156         psaux_init();
 157 #endif
 158 }
 159
 160 static inline unsigned char BitReverse(unsigned short key)
 161 {
 162         unsigned char rkey = 0;
 163         rkey |= (key & 0x1) << 7;
 164         rkey |= (key & 0x2) << 5;
 165         rkey |= (key & 0x4) << 3;
 166         rkey |= (key & 0x8) << 1;
 167         rkey |= (key & 0x10) >> 1;
 168         rkey |= (key & 0x20) >> 3;
 169         rkey |= (key & 0x40) >> 5;
 170         rkey |= (key & 0x80) >> 7;
 171         return rkey;
 172
 173 }
 174
 175
 176 static inline u_int8_t UpperByte(u_int8_t data)
 177 {
 178         return (data >> 4);
 179 }
 180
 181
 182 static inline u_int8_t LowerByte(u_int8_t data)
 183 {
 184         return (data & 0xF);
 185 }
 186
 187
 188 int CheckSumOk(u_int8_t byte1, u_int8_t byte2,
 189                 u_int8_t byte3, u_int8_t byte4, u_int8_t byte5)
 190 {
 191         u_int8_t CheckSum;
 192
 193         CheckSum = (byte1 & 0x0F) + byte2 + byte3 + byte4 + byte5;
 194         if ( LowerByte(UpperByte(CheckSum) + LowerByte(CheckSum)) != UpperByte(byte1) )
 195                 return 0;
 196         else
 197                 return 1;
 198 }
 199
 200
 201 static void kbd_int_handler(int irq, void *dev_id, struct pt_regs *regs)
 202 {
 203         struct cir_port *cir;
 204         int j;
 205         unsigned char int_status;
 206
 207         cir = (struct cir_port *)dev_id;
 208         int_status = get_int_status(cir);
 209         if (int_status & 0x4) {
 210                 clear_fifo(cir);
 211                 return;
 212         }
 213
 214         while (cir_get_rx_count(cir)) {
 215
 216                 cir_data[data_index] = cir_read_data(cir);
 217
 218                 if (data_index == 0) {/* expecting first byte */
 219                         if (cir_data[data_index] != leading1) {
 220                                 //printk("!leading byte %x\n", cir_data[data_index]);
 221                                 set_rx_active(cir);
 222                                 clear_fifo(cir);
 223                                 continue;
 224                         }
 225                 }
 226                 if (data_index == 1) {
 227                         if ((cir_data[data_index] & 0xf) != leading2) {
 228                                 set_rx_active(cir);
 229                                 data_index = 0; /* start over */
 230                                 clear_fifo(cir);
 231                                 continue;
 232                         }
 233                 }
 234
 235                 if ( (cir_data[data_index] == 0xff)) { /* last byte */
 236                         //printk("data_index %d\n", data_index);
 237                         set_rx_active(cir);
 238 #if 0
 239                         for (j=0; j<=data_index; j++) {
 240                                 printk("rx_data %d:  %x\n", j, cir_data[j]);
 241                         }
 242 #endif
 243                         data_index = 0;
 244                         handle_data(cir_data);
 245                         return;
 246                 }
 247                 else if (data_index>16) {
 248                         set_rx_active(cir);
 249 #if 0
 250                         printk("warning: data_index %d\n", data_index);
 251                         for (j=0; j<=data_index; j++) {
 252                                 printk("rx_data %d:  %x\n", j, cir_data[j]);
 253                         }
 254 #endif
 255                         data_index = 0;
 256                         clear_fifo(cir);
 257                         return;
 258                 }
 259                 data_index++;
 260         }
 261 }
 262
 263
 264 #define NUM_KBD_BYTES 5
 265 static int handle_data(unsigned char *p_data)
 266 {
 267         u_int32_t bit_bucket;
 268         u_int32_t i, j;
 269         u_int32_t got_bits, next_byte;
 270         int down = 0;
 271
 272         /* Reorganize the bit stream */
 273         for (i=0; i<16; i++)
 274                 p_data[i] = BitReverse(~p_data[i]);
 275
 276         /*
 277          * We've already previously checked that p_data[0]
 278          * is equal to leading1 and that (p_data[1] & 0xf)
 279          * is equal to leading2. These twelve bits are the
 280          * leader code.  We can now throw them away (the 12
 281          * bits) and continue parsing the stream.
 282          */
 283         bit_bucket = p_data[1] << 12;
 284         got_bits = 4;
 285         next_byte = 2;
 286
 287         /*
 288          * Process four bits at a time
 289          */
 290         for (i=0; i<NUM_KBD_BYTES; i++) {
 291
 292                 kbdbytes[i]=0;
 293
 294                 for (j=0; j<8; j++) /* 8 bits per byte */
 295                 {
 296                         if (got_bits < 4) {
 297                                 bit_bucket |= (p_data[next_byte++] << (8 - got_bits));
 298                                 got_bits += 8;
 299                         }
 300
 301                         if ((bit_bucket & 0xF000) == 0x8000) {
 302                                 /* Convert 1000b to 1 */
 303                                 kbdbytes[i] = 0x80 | (kbdbytes[i] >> 1);
 304                                 got_bits -= 4;
 305                                 bit_bucket = bit_bucket << 4;
 306                         }
 307                         else if ((bit_bucket & 0xC000) == 0x8000) {
 308                                 /* Convert 10b to 0 */
 309                                 kbdbytes[i] =  kbdbytes[i] >> 1;
 310                                 got_bits -= 2;
 311                                 bit_bucket = bit_bucket << 2;
 312                         }
 313                         else {
 314                                 /* bad serial stream */
 315                                 return 1;
 316                         }
 317
 318                         if (next_byte > 16) {
 319                                 //printk("error: too many bytes\n");
 320                                 return 1;
 321                         }
 322                 }
 323         }
 324
 325
 326         if (!CheckSumOk(kbdbytes[0], kbdbytes[1],
 327                                 kbdbytes[2], kbdbytes[3], kbdbytes[4])) {
 328                 //printk("checksum failed\n");
 329                 return 1;
 330         }
 331
 332         if (kbdbytes[1] & 0x08) {
 333                 //printk("m: %x %x %x\n", kbdbytes[1], kbdbytes[2], kbdbytes[3]);
 334                 handle_mouse_event(kbdbytes[1]);
 335                 handle_mouse_event(kbdbytes[2]);
 336                 handle_mouse_event(kbdbytes[3]);
 337         }
 338         else {
 339                 if (kbdbytes[2] == 0) down = 1;
 340 #if 0
 341                 if (down)
 342                         printk("down %d\n", kbdbytes[3]);
 343                 else
 344                         printk("up %d\n", kbdbytes[3]);
 345 #endif
 346                 handle_keyboard_event(kbdbytes[3], down);
 347         }
 348         return 0;
 349 }
 350
 351
 352 DEFINE_SPINLOCK(kbd_controller_lock);
 353 static unsigned char handle_kbd_event(void);
 354
 355
 356 int kbd_setkeycode(unsigned int scancode, unsigned int keycode)
 357 {
 358         printk("kbd_setkeycode scancode %x keycode %x\n", scancode, keycode);
 359         return 0;
 360 }
 361
 362 int kbd_getkeycode(unsigned int scancode)
 363 {
 364         return scancode;
 365 }
 366
 367
 368 int kbd_translate(unsigned char scancode, unsigned char *keycode,
 369                     char raw_mode)
 370 {
 371         static int prev_scancode = 0;
 372
 373         if (scancode == 0x00 || scancode == 0xff) {
 374                 prev_scancode = 0;
 375                 return 0;
 376         }
 377
 378         /* todo */
 379         if (!prev_scancode && scancode == 160) { /* Fn key down */
 380                 //printk("Fn key down\n");
 381                 prev_scancode = 160;
 382                 return 0;
 383         }
 384         else if (prev_scancode && scancode == 160) { /* Fn key up */
 385                 //printk("Fn key up\n");
 386                 prev_scancode = 0;
 387                 return 0;
 388         }
 389
 390         /* todo */
 391         if (prev_scancode == 160) {
 392                 if (scancode <= NUM_FN_KEYS) {
 393                         *keycode = fn_keys[scancode];
 394                         //printk("fn keycode %d\n", *keycode);
 395                 }
 396                 else
 397                         return 0;
 398         }
 399         else if (scancode <= 127) {
 400                 *keycode = scancode;
 401         }
 402         else
 403                 return 0;
 404
 405
 406         return 1;
 407 }
 408
 409 char kbd_unexpected_up(unsigned char keycode)
 410 {
 411         //printk("kbd_unexpected_up\n");
 412         return 0;
 413 }
 414
 415 static unsigned char kbd_exists = 1;
 416
 417 static inline void handle_keyboard_event(unsigned char scancode, int down)
 418 {
 419         kbd_exists = 1;
 420         handle_scancode(scancode, down);
 421         tasklet_schedule(&keyboard_tasklet);
 422 }
 423
 424
 425 void kbd_leds(unsigned char leds)
 426 {
 427 }
 428
 429 /* dummy */
 430 void kbd_init_hw(void)
 431 {
 432 }
 433
 434
 435
 436 static inline void handle_mouse_event(unsigned char scancode)
 437 {
 438         if(scancode == AUX_RECONNECT){
 439                 queue->head = queue->tail = 0;  /* Flush input queue */
 440         //      __aux_write_ack(AUX_ENABLE_DEV);  /* ping the mouse :) */
 441                 return;
 442         }
 443
 444         if (aux_count) {
 445                 int head = queue->head;
 446
 447                 queue->buf[head] = scancode;
 448                 head = (head + 1) & (AUX_BUF_SIZE-1);
 449                 if (head != queue->tail) {
 450                         queue->head = head;
 451                         kill_fasync(&queue->fasync, SIGIO, POLL_IN);
 452                         wake_up_interruptible(&queue->proc_list);
 453                 }
 454         }
 455 }
 456
 457 static unsigned char get_from_queue(void)
 458 {
 459         unsigned char result;
 460         unsigned long flags;
 461
 462         spin_lock_irqsave(&kbd_controller_lock, flags);
 463         result = queue->buf[queue->tail];
 464         queue->tail = (queue->tail + 1) & (AUX_BUF_SIZE-1);
 465         spin_unlock_irqrestore(&kbd_controller_lock, flags);
 466         return result;
 467 }
 468
 469
 470 static inline int queue_empty(void)
 471 {
 472         return queue->head == queue->tail;
 473 }
 474
 475 static int fasync_aux(int fd, struct file *filp, int on)
 476 {
 477         int retval;
 478
 479         //printk("fasync_aux\n");
 480         retval = fasync_helper(fd, filp, on, &queue->fasync);
 481         if (retval < 0)
 482                 return retval;
 483         return 0;
 484 }
 485
 486
 487 /*
 488  * Random magic cookie for the aux device
 489  */
 490 #define AUX_DEV ((void *)queue)
 491
 492 static int release_aux(struct inode * inode, struct file * file)
 493 {
 494         fasync_aux(-1, file, 0);
 495         aux_count--;
 496         return 0;
 497 }
 498
 499 static int open_aux(struct inode * inode, struct file * file)
 500 {
 501         if (aux_count++) {
 502                 return 0;
 503         }
 504         queue->head = queue->tail = 0;          /* Flush input queue */
 505         return 0;
 506 }
 507
 508 /*
 509  * Put bytes from input queue to buffer.
 510  */
 511
 512 static ssize_t read_aux(struct file * file, char * buffer,
 513                         size_t count, loff_t *ppos)
 514 {
 515         DECLARE_WAITQUEUE(wait, current);
 516         ssize_t i = count;
 517         unsigned char c;
 518
 519         if (queue_empty()) {
 520                 if (file->f_flags & O_NONBLOCK)
 521                         return -EAGAIN;
 522                 add_wait_queue(&queue->proc_list, &wait);
 523 repeat:
 524                 set_current_state(TASK_INTERRUPTIBLE);
 525                 if (queue_empty() && !signal_pending(current)) {
 526                         schedule();
 527                         goto repeat;
 528                 }
 529                 current->state = TASK_RUNNING;
 530                 remove_wait_queue(&queue->proc_list, &wait);
 531         }
 532         while (i > 0 && !queue_empty()) {
 533                 c = get_from_queue();
 534                 put_user(c, buffer++);
 535                 i--;
 536         }
 537         if (count-i) {
 538                 struct inode *inode = file->f_dentry->d_inode;
 539                 inode->i_atime = current_fs_time(inode->i_sb);
 540                 return count-i;
 541         }
 542         if (signal_pending(current))
 543                 return -ERESTARTSYS;
 544         return 0;
 545 }
 546
 547 /*
 548  * Write to the aux device.
 549  */
 550
 551 static ssize_t write_aux(struct file * file, const char * buffer,
 552                          size_t count, loff_t *ppos)
 553 {
 554         /*
 555          * The ITE boards this was tested on did not have the
 556          * transmit wires connected.
 557          */
 558         return count;
 559 }
 560
 561 static unsigned int aux_poll(struct file *file, poll_table * wait)
 562 {
 563         poll_wait(file, &queue->proc_list, wait);
 564         if (!queue_empty())
 565                 return POLLIN | POLLRDNORM;
 566         return 0;
 567 }
 568
 569 struct file_operations psaux_fops = {
 570         .read           = read_aux,
 571         .write          = write_aux,
 572         .poll           = aux_poll,
 573         .open           = open_aux,
 574         .release        = release_aux,
 575         .fasync         = fasync_aux,
 576 };
 577
 578 /*
 579  * Initialize driver.
 580  */
 581 static struct miscdevice psaux_mouse = {
 582         PSMOUSE_MINOR, "psaux", &psaux_fops
 583 };
 584
 585 static int __init psaux_init(void)
 586 {
 587         int retval;
 588
 589         retval = misc_register(&psaux_mouse);
 590         if(retval < 0)
 591                 return retval;
 592
 593         queue = (struct aux_queue *) kmalloc(sizeof(*queue), GFP_KERNEL);
 594         memset(queue, 0, sizeof(*queue));
 595         queue->head = queue->tail = 0;
 596         init_waitqueue_head(&queue->proc_list);
 597
 598         return 0;
 599 }
 600 module_init(init_qtronix_990P_kbd);
 601 #endif