SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/i2c/busses/i2c-sh_mobile.c

   1 /*
   2  * SuperH Mobile I2C Controller
   3  *
   4  * Copyright (C) 2008 Magnus Damm
   5  *
   6  * Portions of the code based on out-of-tree driver i2c-sh7343.c
   7  * Copyright (c) 2006 Carlos Munoz <carlos@kenati.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/delay.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/i2c.h>
  30 #include <linux/err.h>
  31 #include <linux/clk.h>
  32 #include <linux/io.h>
  33
  34 /* Transmit operation:                                                      */
  35 /*                                                                          */
  36 /* 0 byte transmit                                                          */
  37 /* BUS:     S     A8     ACK   P                                            */
  38 /* IRQ:       DTE   WAIT                                                    */
  39 /* ICIC:                                                                    */
  40 /* ICCR: 0x94 0x90                                                          */
  41 /* ICDR:      A8                                                            */
  42 /*                                                                          */
  43 /* 1 byte transmit                                                          */
  44 /* BUS:     S     A8     ACK   D8(1)   ACK   P                              */
  45 /* IRQ:       DTE   WAIT         WAIT                                       */
  46 /* ICIC:      -DTE                                                          */
  47 /* ICCR: 0x94       0x90                                                    */
  48 /* ICDR:      A8    D8(1)                                                   */
  49 /*                                                                          */
  50 /* 2 byte transmit                                                          */
  51 /* BUS:     S     A8     ACK   D8(1)   ACK   D8(2)   ACK   P                */
  52 /* IRQ:       DTE   WAIT         WAIT          WAIT                         */
  53 /* ICIC:      -DTE                                                          */
  54 /* ICCR: 0x94                    0x90                                       */
  55 /* ICDR:      A8    D8(1)        D8(2)                                      */
  56 /*                                                                          */
  57 /* 3 bytes or more, +---------+ gets repeated                               */
  58 /*                                                                          */
  59 /*                                                                          */
  60 /* Receive operation:                                                       */
  61 /*                                                                          */
  62 /* 0 byte receive - not supported since slave may hold SDA low              */
  63 /*                                                                          */
  64 /* 1 byte receive       [TX] | [RX]                                         */
  65 /* BUS:     S     A8     ACK | D8(1)   ACK   P                              */
  66 /* IRQ:       DTE   WAIT     |   WAIT     DTE                               */
  67 /* ICIC:      -DTE           |   +DTE                                       */
  68 /* ICCR: 0x94       0x81     |   0xc0                                       */
  69 /* ICDR:      A8             |            D8(1)                             */
  70 /*                                                                          */
  71 /* 2 byte receive        [TX]| [RX]                                         */
  72 /* BUS:     S     A8     ACK | D8(1)   ACK   D8(2)   ACK   P                */
  73 /* IRQ:       DTE   WAIT     |   WAIT          WAIT     DTE                 */
  74 /* ICIC:      -DTE           |                 +DTE                         */
  75 /* ICCR: 0x94       0x81     |                 0xc0                         */
  76 /* ICDR:      A8             |                 D8(1)    D8(2)               */
  77 /*                                                                          */
  78 /* 3 byte receive       [TX] | [RX]                                         */
  79 /* BUS:     S     A8     ACK | D8(1)   ACK   D8(2)   ACK   D8(3)   ACK    P */
  80 /* IRQ:       DTE   WAIT     |   WAIT          WAIT         WAIT      DTE   */
  81 /* ICIC:      -DTE           |                              +DTE            */
  82 /* ICCR: 0x94       0x81     |                              0xc0            */
  83 /* ICDR:      A8             |                 D8(1)        D8(2)     D8(3) */
  84 /*                                                                          */
  85 /* 4 bytes or more, this part is repeated    +---------+                    */
  86 /*                                                                          */
  87 /*                                                                          */
  88 /* Interrupt order and BUSY flag                                            */
  89 /*     ___                                                 _                */
  90 /* SDA ___\___XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXAAAAAAAAA___/                 */
  91 /* SCL      \_/1\_/2\_/3\_/4\_/5\_/6\_/7\_/8\___/9\_____/                   */
  92 /*                                                                          */
  93 /*        S   D7  D6  D5  D4  D3  D2  D1  D0              P                 */
  94 /*                                           ___                            */
  95 /* WAIT IRQ ________________________________/   \___________                */
  96 /* TACK IRQ ____________________________________/   \_______                */
  97 /* DTE  IRQ __________________________________________/   \_                */
  98 /* AL   IRQ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                */
  99 /*         _______________________________________________                  */
 100 /* BUSY __/                                               \_                */
 101 /*                                                                          */
 102
 103 enum sh_mobile_i2c_op {
 104         OP_START = 0,
 105         OP_TX_FIRST,
 106         OP_TX,
 107         OP_TX_STOP,
 108         OP_TX_TO_RX,
 109         OP_RX,
 110         OP_RX_STOP,
 111         OP_RX_STOP_DATA,
 112 };
 113
 114 struct sh_mobile_i2c_data {
 115         struct device *dev;
 116         void __iomem *reg;
 117         struct i2c_adapter adap;
 118
 119         struct clk *clk;
 120         u_int8_t iccl;
 121         u_int8_t icch;
 122
 123         spinlock_t lock;
 124         wait_queue_head_t wait;
 125         struct i2c_msg *msg;
 126         int pos;
 127         int sr;
 128 };
 129
 130 #define NORMAL_SPEED            100000 /* FAST_SPEED 400000 */
 131
 132 /* Register offsets */
 133 #define ICDR(pd)                (pd->reg + 0x00)
 134 #define ICCR(pd)                (pd->reg + 0x04)
 135 #define ICSR(pd)                (pd->reg + 0x08)
 136 #define ICIC(pd)                (pd->reg + 0x0c)
 137 #define ICCL(pd)                (pd->reg + 0x10)
 138 #define ICCH(pd)                (pd->reg + 0x14)
 139
 140 /* Register bits */
 141 #define ICCR_ICE                0x80
 142 #define ICCR_RACK               0x40
 143 #define ICCR_TRS                0x10
 144 #define ICCR_BBSY               0x04
 145 #define ICCR_SCP                0x01
 146
 147 #define ICSR_SCLM               0x80
 148 #define ICSR_SDAM               0x40
 149 #define SW_DONE                 0x20
 150 #define ICSR_BUSY               0x10
 151 #define ICSR_AL                 0x08
 152 #define ICSR_TACK               0x04
 153 #define ICSR_WAIT               0x02
 154 #define ICSR_DTE                0x01
 155
 156 #define ICIC_ALE                0x08
 157 #define ICIC_TACKE              0x04
 158 #define ICIC_WAITE              0x02
 159 #define ICIC_DTEE               0x01
 160
 161 static void activate_ch(struct sh_mobile_i2c_data *pd)
 162 {
 163         /* Make sure the clock is enabled */
 164         clk_enable(pd->clk);
 165
 166         /* Enable channel and configure rx ack */
 167         iowrite8(ioread8(ICCR(pd)) | ICCR_ICE, ICCR(pd));
 168
 169         /* Mask all interrupts */
 170         iowrite8(0, ICIC(pd));
 171
 172         /* Set the clock */
 173         iowrite8(pd->iccl, ICCL(pd));
 174         iowrite8(pd->icch, ICCH(pd));
 175 }
 176
 177 static void deactivate_ch(struct sh_mobile_i2c_data *pd)
 178 {
 179         /* Clear/disable interrupts */
 180         iowrite8(0, ICSR(pd));
 181         iowrite8(0, ICIC(pd));
 182
 183         /* Disable channel */
 184         iowrite8(ioread8(ICCR(pd)) & ~ICCR_ICE, ICCR(pd));
 185
 186         /* Disable clock */
 187         clk_disable(pd->clk);
 188 }
 189
 190 static unsigned char i2c_op(struct sh_mobile_i2c_data *pd,
 191                             enum sh_mobile_i2c_op op, unsigned char data)
 192 {
 193         unsigned char ret = 0;
 194         unsigned long flags;
 195
 196         dev_dbg(pd->dev, "op %d, data in 0x%02x\n", op, data);
 197
 198         spin_lock_irqsave(&pd->lock, flags);
 199
 200         switch (op) {
 201         case OP_START: /* issue start and trigger DTE interrupt */
 202                 iowrite8(0x94, ICCR(pd));
 203                 break;
 204         case OP_TX_FIRST: /* disable DTE interrupt and write data */
 205                 iowrite8(ICIC_WAITE | ICIC_ALE | ICIC_TACKE, ICIC(pd));
 206                 iowrite8(data, ICDR(pd));
 207                 break;
 208         case OP_TX: /* write data */
 209                 iowrite8(data, ICDR(pd));
 210                 break;
 211         case OP_TX_STOP: /* write data and issue a stop afterwards */
 212                 iowrite8(data, ICDR(pd));
 213                 iowrite8(0x90, ICCR(pd));
 214                 break;
 215         case OP_TX_TO_RX: /* select read mode */
 216                 iowrite8(0x81, ICCR(pd));
 217                 break;
 218         case OP_RX: /* just read data */
 219                 ret = ioread8(ICDR(pd));
 220                 break;
 221         case OP_RX_STOP: /* enable DTE interrupt, issue stop */
 222                 iowrite8(ICIC_DTEE | ICIC_WAITE | ICIC_ALE | ICIC_TACKE,
 223                          ICIC(pd));
 224                 iowrite8(0xc0, ICCR(pd));
 225                 break;
 226         case OP_RX_STOP_DATA: /* enable DTE interrupt, read data, issue stop */
 227                 iowrite8(ICIC_DTEE | ICIC_WAITE | ICIC_ALE | ICIC_TACKE,
 228                          ICIC(pd));
 229                 ret = ioread8(ICDR(pd));
 230                 iowrite8(0xc0, ICCR(pd));
 231                 break;
 232         }
 233
 234         spin_unlock_irqrestore(&pd->lock, flags);
 235
 236         dev_dbg(pd->dev, "op %d, data out 0x%02x\n", op, ret);
 237         return ret;
 238 }
 239
 240 static int sh_mobile_i2c_is_first_byte(struct sh_mobile_i2c_data *pd)
 241 {
 242         if (pd->pos == -1)
 243                 return 1;
 244
 245         return 0;
 246 }
 247
 248 static int sh_mobile_i2c_is_last_byte(struct sh_mobile_i2c_data *pd)
 249 {
 250         if (pd->pos == (pd->msg->len - 1))
 251                 return 1;
 252
 253         return 0;
 254 }
 255
 256 static void sh_mobile_i2c_get_data(struct sh_mobile_i2c_data *pd,
 257                                    unsigned char *buf)
 258 {
 259         switch (pd->pos) {
 260         case -1:
 261                 *buf = (pd->msg->addr & 0x7f) << 1;
 262                 *buf |= (pd->msg->flags & I2C_M_RD) ? 1 : 0;
 263                 break;
 264         default:
 265                 *buf = pd->msg->buf[pd->pos];
 266         }
 267 }
 268
 269 static int sh_mobile_i2c_isr_tx(struct sh_mobile_i2c_data *pd)
 270 {
 271         unsigned char data;
 272
 273         if (pd->pos == pd->msg->len)
 274                 return 1;
 275
 276         sh_mobile_i2c_get_data(pd, &data);
 277
 278         if (sh_mobile_i2c_is_last_byte(pd))
 279                 i2c_op(pd, OP_TX_STOP, data);
 280         else if (sh_mobile_i2c_is_first_byte(pd))
 281                 i2c_op(pd, OP_TX_FIRST, data);
 282         else
 283                 i2c_op(pd, OP_TX, data);
 284
 285         pd->pos++;
 286         return 0;
 287 }
 288
 289 static int sh_mobile_i2c_isr_rx(struct sh_mobile_i2c_data *pd)
 290 {
 291         unsigned char data;
 292         int real_pos;
 293
 294         do {
 295                 if (pd->pos <= -1) {
 296                         sh_mobile_i2c_get_data(pd, &data);
 297
 298                         if (sh_mobile_i2c_is_first_byte(pd))
 299                                 i2c_op(pd, OP_TX_FIRST, data);
 300                         else
 301                                 i2c_op(pd, OP_TX, data);
 302                         break;
 303                 }
 304
 305                 if (pd->pos == 0) {
 306                         i2c_op(pd, OP_TX_TO_RX, 0);
 307                         break;
 308                 }
 309
 310                 real_pos = pd->pos - 2;
 311
 312                 if (pd->pos == pd->msg->len) {
 313                         if (real_pos < 0) {
 314                                 i2c_op(pd, OP_RX_STOP, 0);
 315                                 break;
 316                         }
 317                         data = i2c_op(pd, OP_RX_STOP_DATA, 0);
 318                 } else
 319                         data = i2c_op(pd, OP_RX, 0);
 320
 321                 if (real_pos >= 0)
 322                         pd->msg->buf[real_pos] = data;
 323         } while (0);
 324
 325         pd->pos++;
 326         return pd->pos == (pd->msg->len + 2);
 327 }
 328
 329 static irqreturn_t sh_mobile_i2c_isr(int irq, void *dev_id)
 330 {
 331         struct platform_device *dev = dev_id;
 332         struct sh_mobile_i2c_data *pd = platform_get_drvdata(dev);
 333         unsigned char sr;
 334         int wakeup;
 335
 336         sr = ioread8(ICSR(pd));
 337         pd->sr |= sr; /* remember state */
 338
 339         dev_dbg(pd->dev, "i2c_isr 0x%02x 0x%02x %s %d %d!\n", sr, pd->sr,
 340                (pd->msg->flags & I2C_M_RD) ? "read" : "write",
 341                pd->pos, pd->msg->len);
 342
 343         if (sr & (ICSR_AL | ICSR_TACK)) {
 344                 /* don't interrupt transaction - continue to issue stop */
 345                 iowrite8(sr & ~(ICSR_AL | ICSR_TACK), ICSR(pd));
 346                 wakeup = 0;
 347         } else if (pd->msg->flags & I2C_M_RD)
 348                 wakeup = sh_mobile_i2c_isr_rx(pd);
 349         else
 350                 wakeup = sh_mobile_i2c_isr_tx(pd);
 351
 352         if (sr & ICSR_WAIT) /* TODO: add delay here to support slow acks */
 353                 iowrite8(sr & ~ICSR_WAIT, ICSR(pd));
 354
 355         if (wakeup) {
 356                 pd->sr |= SW_DONE;
 357                 wake_up(&pd->wait);
 358         }
 359
 360         return IRQ_HANDLED;
 361 }
 362
 363 static int start_ch(struct sh_mobile_i2c_data *pd, struct i2c_msg *usr_msg)
 364 {
 365         if (usr_msg->len == 0 && (usr_msg->flags & I2C_M_RD)) {
 366                 dev_err(pd->dev, "Unsupported zero length i2c read\n");
 367                 return -EIO;
 368         }
 369
 370         /* Initialize channel registers */
 371         iowrite8(ioread8(ICCR(pd)) & ~ICCR_ICE, ICCR(pd));
 372
 373         /* Enable channel and configure rx ack */
 374         iowrite8(ioread8(ICCR(pd)) | ICCR_ICE, ICCR(pd));
 375
 376         /* Set the clock */
 377         iowrite8(pd->iccl, ICCL(pd));
 378         iowrite8(pd->icch, ICCH(pd));
 379
 380         pd->msg = usr_msg;
 381         pd->pos = -1;
 382         pd->sr = 0;
 383
 384         /* Enable all interrupts to begin with */
 385         iowrite8(ICIC_WAITE | ICIC_ALE | ICIC_TACKE | ICIC_DTEE, ICIC(pd));
 386         return 0;
 387 }
 388
 389 static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter,
 390                               struct i2c_msg *msgs,
 391                               int num)
 392 {
 393         struct sh_mobile_i2c_data *pd = i2c_get_adapdata(adapter);
 394         struct i2c_msg  *msg;
 395         int err = 0;
 396         u_int8_t val;
 397         int i, k, retry_count;
 398
 399         activate_ch(pd);
 400
 401         /* Process all messages */
 402         for (i = 0; i < num; i++) {
 403                 msg = &msgs[i];
 404
 405                 err = start_ch(pd, msg);
 406                 if (err)
 407                         break;
 408
 409                 i2c_op(pd, OP_START, 0);
 410
 411                 /* The interrupt handler takes care of the rest... */
 412                 k = wait_event_timeout(pd->wait,
 413                                        pd->sr & (ICSR_TACK | SW_DONE),
 414                                        5 * HZ);
 415                 if (!k)
 416                         dev_err(pd->dev, "Transfer request timed out\n");
 417
 418                 retry_count = 1000;
 419 again:
 420                 val = ioread8(ICSR(pd));
 421
 422                 dev_dbg(pd->dev, "val 0x%02x pd->sr 0x%02x\n", val, pd->sr);
 423
 424                 /* the interrupt handler may wake us up before the
 425                  * transfer is finished, so poll the hardware
 426                  * until we're done.
 427                  */
 428                 if (val & ICSR_BUSY) {
 429                         udelay(10);
 430                         if (retry_count--)
 431                                 goto again;
 432
 433                         err = -EIO;
 434                         dev_err(pd->dev, "Polling timed out\n");
 435                         break;
 436                 }
 437
 438                 /* handle missing acknowledge and arbitration lost */
 439                 if ((val | pd->sr) & (ICSR_TACK | ICSR_AL)) {
 440                         err = -EIO;
 441                         break;
 442                 }
 443         }
 444
 445         deactivate_ch(pd);
 446
 447         if (!err)
 448                 err = num;
 449         return err;
 450 }
 451
 452 static u32 sh_mobile_i2c_func(struct i2c_adapter *adapter)
 453 {
 454         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 455 }
 456
 457 static struct i2c_algorithm sh_mobile_i2c_algorithm = {
 458         .functionality  = sh_mobile_i2c_func,
 459         .master_xfer    = sh_mobile_i2c_xfer,
 460 };
 461
 462 static void sh_mobile_i2c_setup_channel(struct platform_device *dev)
 463 {
 464         struct sh_mobile_i2c_data *pd = platform_get_drvdata(dev);
 465         unsigned long peripheral_clk = clk_get_rate(pd->clk);
 466         u_int32_t num;
 467         u_int32_t denom;
 468         u_int32_t tmp;
 469
 470         spin_lock_init(&pd->lock);
 471         init_waitqueue_head(&pd->wait);
 472
 473         /* Calculate the value for iccl. From the data sheet:
 474          * iccl = (p clock / transfer rate) * (L / (L + H))
 475          * where L and H are the SCL low/high ratio (5/4 in this case).
 476          * We also round off the result.
 477          */
 478         num = peripheral_clk * 5;
 479         denom = NORMAL_SPEED * 9;
 480         tmp = num * 10 / denom;
 481         if (tmp % 10 >= 5)
 482                 pd->iccl = (u_int8_t)((num/denom) + 1);
 483         else
 484                 pd->iccl = (u_int8_t)(num/denom);
 485
 486         /* Calculate the value for icch. From the data sheet:
 487            icch = (p clock / transfer rate) * (H / (L + H)) */
 488         num = peripheral_clk * 4;
 489         tmp = num * 10 / denom;
 490         if (tmp % 10 >= 5)
 491                 pd->icch = (u_int8_t)((num/denom) + 1);
 492         else
 493                 pd->icch = (u_int8_t)(num/denom);
 494 }
 495
 496 static int sh_mobile_i2c_hook_irqs(struct platform_device *dev, int hook)
 497 {
 498         struct resource *res;
 499         int ret = -ENXIO;
 500         int q, m;
 501         int k = 0;
 502         int n = 0;
 503
 504         while ((res = platform_get_resource(dev, IORESOURCE_IRQ, k))) {
 505                 for (n = res->start; hook && n <= res->end; n++) {
 506                         if (request_irq(n, sh_mobile_i2c_isr, IRQF_DISABLED,
 507                                         dev->dev.bus_id, dev))
 508                                 goto rollback;
 509                 }
 510                 k++;
 511         }
 512
 513         if (hook)
 514                 return k > 0 ? 0 : -ENOENT;
 515
 516         k--;
 517         ret = 0;
 518
 519  rollback:
 520         for (q = k; k >= 0; k--) {
 521                 for (m = n; m >= res->start; m--)
 522                         free_irq(m, dev);
 523
 524                 res = platform_get_resource(dev, IORESOURCE_IRQ, k - 1);
 525                 m = res->end;
 526         }
 527
 528         return ret;
 529 }
 530
 531 static int sh_mobile_i2c_probe(struct platform_device *dev)
 532 {
 533         struct sh_mobile_i2c_data *pd;
 534         struct i2c_adapter *adap;
 535         struct resource *res;
 536         int size;
 537         int ret;
 538
 539         pd = kzalloc(sizeof(struct sh_mobile_i2c_data), GFP_KERNEL);
 540         if (pd == NULL) {
 541                 dev_err(&dev->dev, "cannot allocate private data\n");
 542                 return -ENOMEM;
 543         }
 544
 545         pd->clk = clk_get(&dev->dev, "peripheral_clk");
 546         if (IS_ERR(pd->clk)) {
 547                 dev_err(&dev->dev, "cannot get peripheral clock\n");
 548                 ret = PTR_ERR(pd->clk);
 549                 goto err;
 550         }
 551
 552         ret = sh_mobile_i2c_hook_irqs(dev, 1);
 553         if (ret) {
 554                 dev_err(&dev->dev, "cannot request IRQ\n");
 555                 goto err_clk;
 556         }
 557
 558         pd->dev = &dev->dev;
 559         platform_set_drvdata(dev, pd);
 560
 561         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 562         if (res == NULL) {
 563                 dev_err(&dev->dev, "cannot find IO resource\n");
 564                 ret = -ENOENT;
 565                 goto err_irq;
 566         }
 567
 568         size = (res->end - res->start) + 1;
 569
 570         pd->reg = ioremap(res->start, size);
 571         if (pd->reg == NULL) {
 572                 dev_err(&dev->dev, "cannot map IO\n");
 573                 ret = -ENXIO;
 574                 goto err_irq;
 575         }
 576
 577         /* setup the private data */
 578         adap = &pd->adap;
 579         i2c_set_adapdata(adap, pd);
 580
 581         adap->owner = THIS_MODULE;
 582         adap->algo = &sh_mobile_i2c_algorithm;
 583         adap->dev.parent = &dev->dev;
 584         adap->retries = 5;
 585         adap->nr = dev->id;
 586
 587         strlcpy(adap->name, dev->name, sizeof(adap->name));
 588
 589         sh_mobile_i2c_setup_channel(dev);
 590
 591         ret = i2c_add_numbered_adapter(adap);
 592         if (ret < 0) {
 593                 dev_err(&dev->dev, "cannot add numbered adapter\n");
 594                 goto err_all;
 595         }
 596
 597         return 0;
 598
 599  err_all:
 600         iounmap(pd->reg);
 601  err_irq:
 602         sh_mobile_i2c_hook_irqs(dev, 0);
 603  err_clk:
 604         clk_put(pd->clk);
 605  err:
 606         kfree(pd);
 607         return ret;
 608 }
 609
 610 static int sh_mobile_i2c_remove(struct platform_device *dev)
 611 {
 612         struct sh_mobile_i2c_data *pd = platform_get_drvdata(dev);
 613
 614         i2c_del_adapter(&pd->adap);
 615         iounmap(pd->reg);
 616         sh_mobile_i2c_hook_irqs(dev, 0);
 617         clk_put(pd->clk);
 618         kfree(pd);
 619         return 0;
 620 }
 621
 622 static struct platform_driver sh_mobile_i2c_driver = {
 623         .driver         = {
 624                 .name           = "i2c-sh_mobile",
 625                 .owner          = THIS_MODULE,
 626         },
 627         .probe          = sh_mobile_i2c_probe,
 628         .remove         = sh_mobile_i2c_remove,
 629 };
 630
 631 static int __init sh_mobile_i2c_adap_init(void)
 632 {
 633         return platform_driver_register(&sh_mobile_i2c_driver);
 634 }
 635
 636 static void __exit sh_mobile_i2c_adap_exit(void)
 637 {
 638         platform_driver_unregister(&sh_mobile_i2c_driver);
 639 }
 640
 641 module_init(sh_mobile_i2c_adap_init);
 642 module_exit(sh_mobile_i2c_adap_exit);
 643
 644 MODULE_DESCRIPTION("SuperH Mobile I2C Bus Controller driver");
 645 MODULE_AUTHOR("Magnus Damm");
 646 MODULE_LICENSE("GPL v2");