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   1 /*
   2     i2c Support for Apple Keywest I2C Bus Controller
   3
   4     Copyright (c) 2001 Benjamin Herrenschmidt <benh@kernel.crashing.org>
   5
   6     Original work by
   7
   8     Copyright (c) 2000 Philip Edelbrock <phil@stimpy.netroedge.com>
   9
  10     This program is free software; you can redistribute it and/or modify
  11     it under the terms of the GNU General Public License as published by
  12     the Free Software Foundation; either version 2 of the License, or
  13     (at your option) any later version.
  14
  15     This program is distributed in the hope that it will be useful,
  16     but WITHOUT ANY WARRANTY; without even the implied warranty of
  17     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18     GNU General Public License for more details.
  19
  20     You should have received a copy of the GNU General Public License
  21     along with this program; if not, write to the Free Software
  22     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24     Changes:
  25
  26     2001/12/13 BenH     New implementation
  27     2001/12/15 BenH     Add support for "byte" and "quick"
  28                         transfers. Add i2c_xfer routine.
  29     2003/09/21 BenH     Rework state machine with Paulus help
  30     2004/01/21 BenH     Merge in Greg KH changes, polled mode is back
  31     2004/02/05 BenH     Merge 64 bits fixes from the g5 ppc64 tree
  32
  33     My understanding of the various modes supported by keywest are:
  34
  35      - Dumb mode : not implemented, probably direct tweaking of lines
  36      - Standard mode : simple i2c transaction of type
  37          S Addr R/W A Data A Data ... T
  38      - Standard sub mode : combined 8 bit subaddr write with data read
  39          S Addr R/W A SubAddr A Data A Data ... T
  40      - Combined mode : Subaddress and Data sequences appended with no stop
  41          S Addr R/W A SubAddr S Addr R/W A Data A Data ... T
  42
  43     Currently, this driver uses only Standard mode for i2c xfer, and
  44     smbus byte & quick transfers ; and uses StandardSub mode for
  45     other smbus transfers instead of combined as we need that for the
  46     sound driver to be happy
  47 */
  48
  49 #include <linux/module.h>
  50 #include <linux/kernel.h>
  51 #include <linux/ioport.h>
  52 #include <linux/pci.h>
  53 #include <linux/types.h>
  54 #include <linux/delay.h>
  55 #include <linux/i2c.h>
  56 #include <linux/init.h>
  57 #include <linux/mm.h>
  58 #include <linux/timer.h>
  59 #include <linux/spinlock.h>
  60 #include <linux/completion.h>
  61 #include <linux/interrupt.h>
  62
  63 #include <asm/io.h>
  64 #include <asm/prom.h>
  65 #include <asm/machdep.h>
  66 #include <asm/pmac_feature.h>
  67 #include <asm/pmac_low_i2c.h>
  68
  69 #include "i2c-keywest.h"
  70
  71 #undef POLLED_MODE
  72
  73 /* Some debug macros */
  74 #define WRONG_STATE(name) do {\
  75                 pr_debug("KW: wrong state. Got %s, state: %s (isr: %02x)\n", \
  76                          name, __kw_state_names[iface->state], isr);    \
  77         } while(0)
  78
  79 #ifdef DEBUG
  80 static const char *__kw_state_names[] = {
  81         "state_idle",
  82         "state_addr",
  83         "state_read",
  84         "state_write",
  85         "state_stop",
  86         "state_dead"
  87 };
  88 #endif /* DEBUG */
  89
  90 static int probe;
  91
  92 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
  93 MODULE_DESCRIPTION("I2C driver for Apple's Keywest");
  94 MODULE_LICENSE("GPL");
  95 module_param(probe, bool, 0);
  96
  97 #ifdef POLLED_MODE
  98 /* Don't schedule, the g5 fan controller is too
  99  * timing sensitive
 100  */
 101 static u8
 102 wait_interrupt(struct keywest_iface* iface)
 103 {
 104         int i;
 105         u8 isr;
 106
 107         for (i = 0; i < 200000; i++) {
 108                 isr = read_reg(reg_isr) & KW_I2C_IRQ_MASK;
 109                 if (isr != 0)
 110                         return isr;
 111                 udelay(10);
 112         }
 113         return isr;
 114 }
 115 #endif /* POLLED_MODE */
 116
 117 static void
 118 do_stop(struct keywest_iface* iface, int result)
 119 {
 120         write_reg(reg_control, KW_I2C_CTL_STOP);
 121         iface->state = state_stop;
 122         iface->result = result;
 123 }
 124
 125 /* Main state machine for standard & standard sub mode */
 126 static void
 127 handle_interrupt(struct keywest_iface *iface, u8 isr)
 128 {
 129         int ack;
 130
 131         if (isr == 0) {
 132                 if (iface->state != state_stop) {
 133                         pr_debug("KW: Timeout !\n");
 134                         do_stop(iface, -EIO);
 135                 }
 136                 if (iface->state == state_stop) {
 137                         ack = read_reg(reg_status);
 138                         if (!(ack & KW_I2C_STAT_BUSY)) {
 139                                 iface->state = state_idle;
 140                                 write_reg(reg_ier, 0x00);
 141 #ifndef POLLED_MODE
 142                                 complete(&iface->complete);
 143 #endif /* POLLED_MODE */
 144                         }
 145                 }
 146                 return;
 147         }
 148
 149         if (isr & KW_I2C_IRQ_ADDR) {
 150                 ack = read_reg(reg_status);
 151                 if (iface->state != state_addr) {
 152                         write_reg(reg_isr, KW_I2C_IRQ_ADDR);
 153                         WRONG_STATE("KW_I2C_IRQ_ADDR");
 154                         do_stop(iface, -EIO);
 155                         return;
 156                 }
 157                 if ((ack & KW_I2C_STAT_LAST_AAK) == 0) {
 158                         iface->state = state_stop;
 159                         iface->result = -ENODEV;
 160                         pr_debug("KW: NAK on address\n");
 161                 } else {
 162                         /* Handle rw "quick" mode */
 163                         if (iface->datalen == 0) {
 164                                 do_stop(iface, 0);
 165                         } else if (iface->read_write == I2C_SMBUS_READ) {
 166                                 iface->state = state_read;
 167                                 if (iface->datalen > 1)
 168                                         write_reg(reg_control, KW_I2C_CTL_AAK);
 169                         } else {
 170                                 iface->state = state_write;
 171                                 write_reg(reg_data, *(iface->data++));
 172                                 iface->datalen--;
 173                         }
 174                 }
 175                 write_reg(reg_isr, KW_I2C_IRQ_ADDR);
 176         }
 177
 178         if (isr & KW_I2C_IRQ_DATA) {
 179                 if (iface->state == state_read) {
 180                         *(iface->data++) = read_reg(reg_data);
 181                         write_reg(reg_isr, KW_I2C_IRQ_DATA);
 182                         iface->datalen--;
 183                         if (iface->datalen == 0)
 184                                 iface->state = state_stop;
 185                         else if (iface->datalen == 1)
 186                                 write_reg(reg_control, 0);
 187                 } else if (iface->state == state_write) {
 188                         /* Check ack status */
 189                         ack = read_reg(reg_status);
 190                         if ((ack & KW_I2C_STAT_LAST_AAK) == 0) {
 191                                 pr_debug("KW: nack on data write (%x): %x\n",
 192                                     iface->data[-1], ack);
 193                                 do_stop(iface, -EIO);
 194                         } else if (iface->datalen) {
 195                                 write_reg(reg_data, *(iface->data++));
 196                                 iface->datalen--;
 197                         } else {
 198                                 write_reg(reg_control, KW_I2C_CTL_STOP);
 199                                 iface->state = state_stop;
 200                                 iface->result = 0;
 201                         }
 202                         write_reg(reg_isr, KW_I2C_IRQ_DATA);
 203                 } else {
 204                         write_reg(reg_isr, KW_I2C_IRQ_DATA);
 205                         WRONG_STATE("KW_I2C_IRQ_DATA");
 206                         if (iface->state != state_stop)
 207                                 do_stop(iface, -EIO);
 208                 }
 209         }
 210
 211         if (isr & KW_I2C_IRQ_STOP) {
 212                 write_reg(reg_isr, KW_I2C_IRQ_STOP);
 213                 if (iface->state != state_stop) {
 214                         WRONG_STATE("KW_I2C_IRQ_STOP");
 215                         iface->result = -EIO;
 216                 }
 217                 iface->state = state_idle;
 218                 write_reg(reg_ier, 0x00);
 219 #ifndef POLLED_MODE
 220                 complete(&iface->complete);
 221 #endif /* POLLED_MODE */
 222         }
 223
 224         if (isr & KW_I2C_IRQ_START)
 225                 write_reg(reg_isr, KW_I2C_IRQ_START);
 226 }
 227
 228 #ifndef POLLED_MODE
 229
 230 /* Interrupt handler */
 231 static irqreturn_t
 232 keywest_irq(int irq, void *dev_id, struct pt_regs *regs)
 233 {
 234         struct keywest_iface *iface = (struct keywest_iface *)dev_id;
 235         unsigned long flags;
 236
 237         spin_lock_irqsave(&iface->lock, flags);
 238         del_timer(&iface->timeout_timer);
 239         handle_interrupt(iface, read_reg(reg_isr));
 240         if (iface->state != state_idle) {
 241                 iface->timeout_timer.expires = jiffies + POLL_TIMEOUT;
 242                 add_timer(&iface->timeout_timer);
 243         }
 244         spin_unlock_irqrestore(&iface->lock, flags);
 245         return IRQ_HANDLED;
 246 }
 247
 248 static void
 249 keywest_timeout(unsigned long data)
 250 {
 251         struct keywest_iface *iface = (struct keywest_iface *)data;
 252         unsigned long flags;
 253
 254         pr_debug("timeout !\n");
 255         spin_lock_irqsave(&iface->lock, flags);
 256         handle_interrupt(iface, read_reg(reg_isr));
 257         if (iface->state != state_idle) {
 258                 iface->timeout_timer.expires = jiffies + POLL_TIMEOUT;
 259                 add_timer(&iface->timeout_timer);
 260         }
 261         spin_unlock_irqrestore(&iface->lock, flags);
 262 }
 263
 264 #endif /* POLLED_MODE */
 265
 266 /*
 267  * SMBUS-type transfer entrypoint
 268  */
 269 static s32
 270 keywest_smbus_xfer(     struct i2c_adapter*     adap,
 271                         u16                     addr,
 272                         unsigned short          flags,
 273                         char                    read_write,
 274                         u8                      command,
 275                         int                     size,
 276                         union i2c_smbus_data*   data)
 277 {
 278         struct keywest_chan* chan = i2c_get_adapdata(adap);
 279         struct keywest_iface* iface = chan->iface;
 280         int len;
 281         u8* buffer;
 282         u16 cur_word;
 283         int rc = 0;
 284
 285         if (iface->state == state_dead)
 286                 return -ENXIO;
 287
 288         /* Prepare datas & select mode */
 289         iface->cur_mode &= ~KW_I2C_MODE_MODE_MASK;
 290         switch (size) {
 291         case I2C_SMBUS_QUICK:
 292                 len = 0;
 293                 buffer = NULL;
 294                 iface->cur_mode |= KW_I2C_MODE_STANDARD;
 295                 break;
 296         case I2C_SMBUS_BYTE:
 297                 len = 1;
 298                 buffer = &data->byte;
 299                 iface->cur_mode |= KW_I2C_MODE_STANDARD;
 300                 break;
 301         case I2C_SMBUS_BYTE_DATA:
 302                 len = 1;
 303                 buffer = &data->byte;
 304                 iface->cur_mode |= KW_I2C_MODE_STANDARDSUB;
 305                 break;
 306         case I2C_SMBUS_WORD_DATA:
 307                 len = 2;
 308                 cur_word = cpu_to_le16(data->word);
 309                 buffer = (u8 *)&cur_word;
 310                 iface->cur_mode |= KW_I2C_MODE_STANDARDSUB;
 311                 break;
 312         case I2C_SMBUS_BLOCK_DATA:
 313                 len = data->block[0];
 314                 buffer = &data->block[1];
 315                 iface->cur_mode |= KW_I2C_MODE_STANDARDSUB;
 316                 break;
 317         default:
 318                 return -1;
 319         }
 320
 321         /* Turn a standardsub read into a combined mode access */
 322         if (read_write == I2C_SMBUS_READ
 323             && (iface->cur_mode & KW_I2C_MODE_MODE_MASK) == KW_I2C_MODE_STANDARDSUB) {
 324                 iface->cur_mode &= ~KW_I2C_MODE_MODE_MASK;
 325                 iface->cur_mode |= KW_I2C_MODE_COMBINED;
 326         }
 327
 328         /* Original driver had this limitation */
 329         if (len > 32)
 330                 len = 32;
 331
 332         if (pmac_low_i2c_lock(iface->node))
 333                 return -ENXIO;
 334
 335         pr_debug("chan: %d, addr: 0x%x, transfer len: %d, read: %d\n",
 336                 chan->chan_no, addr, len, read_write == I2C_SMBUS_READ);
 337
 338         iface->data = buffer;
 339         iface->datalen = len;
 340         iface->state = state_addr;
 341         iface->result = 0;
 342         iface->read_write = read_write;
 343
 344         /* Setup channel & clear pending irqs */
 345         write_reg(reg_isr, read_reg(reg_isr));
 346         write_reg(reg_mode, iface->cur_mode | (chan->chan_no << 4));
 347         write_reg(reg_status, 0);
 348
 349         /* Set up address and r/w bit */
 350         write_reg(reg_addr,
 351                 (addr << 1) | ((read_write == I2C_SMBUS_READ) ? 0x01 : 0x00));
 352
 353         /* Set up the sub address */
 354         if ((iface->cur_mode & KW_I2C_MODE_MODE_MASK) == KW_I2C_MODE_STANDARDSUB
 355             || (iface->cur_mode & KW_I2C_MODE_MODE_MASK) == KW_I2C_MODE_COMBINED)
 356                 write_reg(reg_subaddr, command);
 357
 358 #ifndef POLLED_MODE
 359         /* Arm timeout */
 360         iface->timeout_timer.expires = jiffies + POLL_TIMEOUT;
 361         add_timer(&iface->timeout_timer);
 362 #endif
 363
 364         /* Start sending address & enable interrupt*/
 365         write_reg(reg_control, KW_I2C_CTL_XADDR);
 366         write_reg(reg_ier, KW_I2C_IRQ_MASK);
 367
 368 #ifdef POLLED_MODE
 369         pr_debug("using polled mode...\n");
 370         /* State machine, to turn into an interrupt handler */
 371         while(iface->state != state_idle) {
 372                 unsigned long flags;
 373
 374                 u8 isr = wait_interrupt(iface);
 375                 spin_lock_irqsave(&iface->lock, flags);
 376                 handle_interrupt(iface, isr);
 377                 spin_unlock_irqrestore(&iface->lock, flags);
 378         }
 379 #else /* POLLED_MODE */
 380         pr_debug("using interrupt mode...\n");
 381         wait_for_completion(&iface->complete);
 382 #endif /* POLLED_MODE */
 383
 384         rc = iface->result;
 385         pr_debug("transfer done, result: %d\n", rc);
 386
 387         if (rc == 0 && size == I2C_SMBUS_WORD_DATA && read_write == I2C_SMBUS_READ)
 388                 data->word = le16_to_cpu(cur_word);
 389
 390         /* Release sem */
 391         pmac_low_i2c_unlock(iface->node);
 392
 393         return rc;
 394 }
 395
 396 /*
 397  * Generic i2c master transfer entrypoint
 398  */
 399 static int
 400 keywest_xfer(   struct i2c_adapter *adap,
 401                 struct i2c_msg *msgs,
 402                 int num)
 403 {
 404         struct keywest_chan* chan = i2c_get_adapdata(adap);
 405         struct keywest_iface* iface = chan->iface;
 406         struct i2c_msg *pmsg;
 407         int i, completed;
 408         int rc = 0;
 409
 410         if (iface->state == state_dead)
 411                 return -ENXIO;
 412
 413         if (pmac_low_i2c_lock(iface->node))
 414                 return -ENXIO;
 415
 416         /* Set adapter to standard mode */
 417         iface->cur_mode &= ~KW_I2C_MODE_MODE_MASK;
 418         iface->cur_mode |= KW_I2C_MODE_STANDARD;
 419
 420         completed = 0;
 421         for (i = 0; rc >= 0 && i < num;) {
 422                 u8 addr;
 423
 424                 pmsg = &msgs[i++];
 425                 addr = pmsg->addr;
 426                 if (pmsg->flags & I2C_M_TEN) {
 427                         printk(KERN_ERR "i2c-keywest: 10 bits addr not supported !\n");
 428                         rc = -EINVAL;
 429                         break;
 430                 }
 431                 pr_debug("xfer: chan: %d, doing %s %d bytes to 0x%02x - %d of %d messages\n",
 432                      chan->chan_no,
 433                      pmsg->flags & I2C_M_RD ? "read" : "write",
 434                      pmsg->len, addr, i, num);
 435
 436                 /* Setup channel & clear pending irqs */
 437                 write_reg(reg_mode, iface->cur_mode | (chan->chan_no << 4));
 438                 write_reg(reg_isr, read_reg(reg_isr));
 439                 write_reg(reg_status, 0);
 440
 441                 iface->data = pmsg->buf;
 442                 iface->datalen = pmsg->len;
 443                 iface->state = state_addr;
 444                 iface->result = 0;
 445                 if (pmsg->flags & I2C_M_RD)
 446                         iface->read_write = I2C_SMBUS_READ;
 447                 else
 448                         iface->read_write = I2C_SMBUS_WRITE;
 449
 450                 /* Set up address and r/w bit */
 451                 if (pmsg->flags & I2C_M_REV_DIR_ADDR)
 452                         addr ^= 1;
 453                 write_reg(reg_addr,
 454                         (addr << 1) |
 455                         ((iface->read_write == I2C_SMBUS_READ) ? 0x01 : 0x00));
 456
 457 #ifndef POLLED_MODE
 458                 /* Arm timeout */
 459                 iface->timeout_timer.expires = jiffies + POLL_TIMEOUT;
 460                 add_timer(&iface->timeout_timer);
 461 #endif
 462
 463                 /* Start sending address & enable interrupt*/
 464                 write_reg(reg_ier, KW_I2C_IRQ_MASK);
 465                 write_reg(reg_control, KW_I2C_CTL_XADDR);
 466
 467 #ifdef POLLED_MODE
 468                 pr_debug("using polled mode...\n");
 469                 /* State machine, to turn into an interrupt handler */
 470                 while(iface->state != state_idle) {
 471                         u8 isr = wait_interrupt(iface);
 472                         handle_interrupt(iface, isr);
 473                 }
 474 #else /* POLLED_MODE */
 475                 pr_debug("using interrupt mode...\n");
 476                 wait_for_completion(&iface->complete);
 477 #endif /* POLLED_MODE */
 478
 479                 rc = iface->result;
 480                 if (rc == 0)
 481                         completed++;
 482                 pr_debug("transfer done, result: %d\n", rc);
 483         }
 484
 485         /* Release sem */
 486         pmac_low_i2c_unlock(iface->node);
 487
 488         return completed;
 489 }
 490
 491 static u32
 492 keywest_func(struct i2c_adapter * adapter)
 493 {
 494         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
 495                I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
 496                I2C_FUNC_SMBUS_BLOCK_DATA;
 497 }
 498
 499 /* For now, we only handle combined mode (smbus) */
 500 static struct i2c_algorithm keywest_algorithm = {
 501         .name           = "Keywest i2c",
 502         .id             = I2C_ALGO_SMBUS,
 503         .smbus_xfer     = keywest_smbus_xfer,
 504         .master_xfer    = keywest_xfer,
 505         .functionality  = keywest_func,
 506 };
 507
 508
 509 static int
 510 create_iface(struct device_node *np, struct device *dev)
 511 {
 512         unsigned long steps;
 513         unsigned bsteps, tsize, i, nchan, addroffset;
 514         struct keywest_iface* iface;
 515         u32 *psteps, *prate;
 516         int rc;
 517
 518         if (np->n_intrs < 1 || np->n_addrs < 1) {
 519                 printk(KERN_ERR "%s: Missing interrupt or address !\n",
 520                        np->full_name);
 521                 return -ENODEV;
 522         }
 523         if (pmac_low_i2c_lock(np))
 524                 return -ENODEV;
 525
 526         psteps = (u32 *)get_property(np, "AAPL,address-step", NULL);
 527         steps = psteps ? (*psteps) : 0x10;
 528
 529         /* Hrm... maybe we can be smarter here */
 530         for (bsteps = 0; (steps & 0x01) == 0; bsteps++)
 531                 steps >>= 1;
 532
 533         if (np->parent->name[0] == 'u') {
 534                 nchan = 2;
 535                 addroffset = 3;
 536         } else {
 537                 addroffset = 0;
 538                 nchan = 1;
 539         }
 540
 541         tsize = sizeof(struct keywest_iface) +
 542                 (sizeof(struct keywest_chan) + 4) * nchan;
 543         iface = (struct keywest_iface *) kmalloc(tsize, GFP_KERNEL);
 544         if (iface == NULL) {
 545                 printk(KERN_ERR "i2c-keywest: can't allocate inteface !\n");
 546                 pmac_low_i2c_unlock(np);
 547                 return -ENOMEM;
 548         }
 549         memset(iface, 0, tsize);
 550         spin_lock_init(&iface->lock);
 551         init_completion(&iface->complete);
 552         iface->node = of_node_get(np);
 553         iface->bsteps = bsteps;
 554         iface->chan_count = nchan;
 555         iface->state = state_idle;
 556         iface->irq = np->intrs[0].line;
 557         iface->channels = (struct keywest_chan *)
 558                 (((unsigned long)(iface + 1) + 3UL) & ~3UL);
 559         iface->base = ioremap(np->addrs[0].address + addroffset,
 560                                                 np->addrs[0].size);
 561         if (!iface->base) {
 562                 printk(KERN_ERR "i2c-keywest: can't map inteface !\n");
 563                 kfree(iface);
 564                 pmac_low_i2c_unlock(np);
 565                 return -ENOMEM;
 566         }
 567
 568 #ifndef POLLED_MODE
 569         init_timer(&iface->timeout_timer);
 570         iface->timeout_timer.function = keywest_timeout;
 571         iface->timeout_timer.data = (unsigned long)iface;
 572 #endif
 573
 574         /* Select interface rate */
 575         iface->cur_mode = KW_I2C_MODE_100KHZ;
 576         prate = (u32 *)get_property(np, "AAPL,i2c-rate", NULL);
 577         if (prate) switch(*prate) {
 578         case 100:
 579                 iface->cur_mode = KW_I2C_MODE_100KHZ;
 580                 break;
 581         case 50:
 582                 iface->cur_mode = KW_I2C_MODE_50KHZ;
 583                 break;
 584         case 25:
 585                 iface->cur_mode = KW_I2C_MODE_25KHZ;
 586                 break;
 587         default:
 588                 printk(KERN_WARNING "i2c-keywest: unknown rate %ldKhz, using 100KHz\n",
 589                        (long)*prate);
 590         }
 591
 592         /* Select standard mode by default */
 593         iface->cur_mode |= KW_I2C_MODE_STANDARD;
 594
 595         /* Write mode */
 596         write_reg(reg_mode, iface->cur_mode);
 597
 598         /* Switch interrupts off & clear them*/
 599         write_reg(reg_ier, 0x00);
 600         write_reg(reg_isr, KW_I2C_IRQ_MASK);
 601
 602 #ifndef POLLED_MODE
 603         /* Request chip interrupt */
 604         rc = request_irq(iface->irq, keywest_irq, SA_INTERRUPT, "keywest i2c", iface);
 605         if (rc) {
 606                 printk(KERN_ERR "i2c-keywest: can't get IRQ %d !\n", iface->irq);
 607                 iounmap(iface->base);
 608                 kfree(iface);
 609                 pmac_low_i2c_unlock(np);
 610                 return -ENODEV;
 611         }
 612 #endif /* POLLED_MODE */
 613
 614         pmac_low_i2c_unlock(np);
 615         dev_set_drvdata(dev, iface);
 616
 617         for (i=0; i<nchan; i++) {
 618                 struct keywest_chan* chan = &iface->channels[i];
 619                 u8 addr;
 620
 621                 sprintf(chan->adapter.name, "%s %d", np->parent->name, i);
 622                 chan->iface = iface;
 623                 chan->chan_no = i;
 624                 chan->adapter.id = I2C_ALGO_SMBUS;
 625                 chan->adapter.algo = &keywest_algorithm;
 626                 chan->adapter.algo_data = NULL;
 627                 chan->adapter.client_register = NULL;
 628                 chan->adapter.client_unregister = NULL;
 629                 i2c_set_adapdata(&chan->adapter, chan);
 630                 chan->adapter.dev.parent = dev;
 631
 632                 rc = i2c_add_adapter(&chan->adapter);
 633                 if (rc) {
 634                         printk("i2c-keywest.c: Adapter %s registration failed\n",
 635                                 chan->adapter.name);
 636                         i2c_set_adapdata(&chan->adapter, NULL);
 637                 }
 638                 if (probe) {
 639                         printk("Probe: ");
 640                         for (addr = 0x00; addr <= 0x7f; addr++) {
 641                                 if (i2c_smbus_xfer(&chan->adapter,addr,
 642                                     0,0,0,I2C_SMBUS_QUICK,NULL) >= 0)
 643                                         printk("%02x ", addr);
 644                         }
 645                         printk("\n");
 646                 }
 647         }
 648
 649         printk(KERN_INFO "Found KeyWest i2c on \"%s\", %d channel%s, stepping: %d bits\n",
 650                 np->parent->name, nchan, nchan > 1 ? "s" : "", bsteps);
 651
 652         return 0;
 653 }
 654
 655 static int
 656 dispose_iface(struct device *dev)
 657 {
 658         struct keywest_iface *iface = dev_get_drvdata(dev);
 659         int i, rc;
 660
 661         /* Make sure we stop all activity */
 662         if (pmac_low_i2c_lock(iface->node))
 663                 return -ENODEV;
 664
 665 #ifndef POLLED_MODE
 666         spin_lock_irq(&iface->lock);
 667         while (iface->state != state_idle) {
 668                 spin_unlock_irq(&iface->lock);
 669                 msleep(100);
 670                 spin_lock_irq(&iface->lock);
 671         }
 672 #endif /* POLLED_MODE */
 673         iface->state = state_dead;
 674 #ifndef POLLED_MODE
 675         spin_unlock_irq(&iface->lock);
 676         free_irq(iface->irq, iface);
 677 #endif /* POLLED_MODE */
 678
 679         pmac_low_i2c_unlock(iface->node);
 680
 681         /* Release all channels */
 682         for (i=0; i<iface->chan_count; i++) {
 683                 struct keywest_chan* chan = &iface->channels[i];
 684                 if (i2c_get_adapdata(&chan->adapter) == NULL)
 685                         continue;
 686                 rc = i2c_del_adapter(&chan->adapter);
 687                 i2c_set_adapdata(&chan->adapter, NULL);
 688                 /* We aren't that prepared to deal with this... */
 689                 if (rc)
 690                         printk("i2c-keywest.c: i2c_del_adapter failed, that's bad !\n");
 691         }
 692         iounmap(iface->base);
 693         dev_set_drvdata(dev, NULL);
 694         of_node_put(iface->node);
 695         kfree(iface);
 696
 697         return 0;
 698 }
 699
 700 static int
 701 create_iface_macio(struct macio_dev* dev, const struct of_match *match)
 702 {
 703         return create_iface(dev->ofdev.node, &dev->ofdev.dev);
 704 }
 705
 706 static int
 707 dispose_iface_macio(struct macio_dev* dev)
 708 {
 709         return dispose_iface(&dev->ofdev.dev);
 710 }
 711
 712 static int
 713 create_iface_of_platform(struct of_device* dev, const struct of_match *match)
 714 {
 715         return create_iface(dev->node, &dev->dev);
 716 }
 717
 718 static int
 719 dispose_iface_of_platform(struct of_device* dev)
 720 {
 721         return dispose_iface(&dev->dev);
 722 }
 723
 724 static struct of_match i2c_keywest_match[] =
 725 {
 726         {
 727         .name           = OF_ANY_MATCH,
 728         .type           = "i2c",
 729         .compatible     = "keywest"
 730         },
 731         {},
 732 };
 733
 734 static struct macio_driver i2c_keywest_macio_driver =
 735 {
 736         .name           = "i2c-keywest",
 737         .match_table    = i2c_keywest_match,
 738         .probe          = create_iface_macio,
 739         .remove         = dispose_iface_macio
 740 };
 741
 742 static struct of_platform_driver i2c_keywest_of_platform_driver =
 743 {
 744         .name           = "i2c-keywest",
 745         .match_table    = i2c_keywest_match,
 746         .probe          = create_iface_of_platform,
 747         .remove         = dispose_iface_of_platform
 748 };
 749
 750 static int __init
 751 i2c_keywest_init(void)
 752 {
 753         of_register_driver(&i2c_keywest_of_platform_driver);
 754         macio_register_driver(&i2c_keywest_macio_driver);
 755
 756         return 0;
 757 }
 758
 759 static void __exit
 760 i2c_keywest_cleanup(void)
 761 {
 762         of_unregister_driver(&i2c_keywest_of_platform_driver);
 763         macio_unregister_driver(&i2c_keywest_macio_driver);
 764 }
 765
 766 module_init(i2c_keywest_init);
 767 module_exit(i2c_keywest_cleanup);