err.no Git - linux-2.6/blob - drivers/mfd/asic3.c

   1 /*
   2  * driver/mfd/asic3.c
   3  *
   4  * Compaq ASIC3 support.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * Copyright 2001 Compaq Computer Corporation.
  11  * Copyright 2004-2005 Phil Blundell
  12  * Copyright 2007-2008 OpenedHand Ltd.
  13  *
  14  * Authors: Phil Blundell <pb@handhelds.org>,
  15  *          Samuel Ortiz <sameo@openedhand.com>
  16  *
  17  */
  18
  19 #include <linux/version.h>
  20 #include <linux/kernel.h>
  21 #include <linux/irq.h>
  22 #include <linux/gpio.h>
  23 #include <linux/io.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/platform_device.h>
  26
  27 #include <linux/mfd/asic3.h>
  28
  29 struct asic3 {
  30         void __iomem *mapping;
  31         unsigned int bus_shift;
  32         unsigned int irq_nr;
  33         unsigned int irq_base;
  34         spinlock_t lock;
  35         u16 irq_bothedge[4];
  36         struct gpio_chip gpio;
  37         struct device *dev;
  38 };
  39
  40 static int asic3_gpio_get(struct gpio_chip *chip, unsigned offset);
  41
  42 static inline void asic3_write_register(struct asic3 *asic,
  43                                  unsigned int reg, u32 value)
  44 {
  45         iowrite16(value, asic->mapping +
  46                   (reg >> asic->bus_shift));
  47 }
  48
  49 static inline u32 asic3_read_register(struct asic3 *asic,
  50                                unsigned int reg)
  51 {
  52         return ioread16(asic->mapping +
  53                         (reg >> asic->bus_shift));
  54 }
  55
  56 /* IRQs */
  57 #define MAX_ASIC_ISR_LOOPS    20
  58 #define ASIC3_GPIO_BASE_INCR \
  59         (ASIC3_GPIO_B_BASE - ASIC3_GPIO_A_BASE)
  60
  61 static void asic3_irq_flip_edge(struct asic3 *asic,
  62                                 u32 base, int bit)
  63 {
  64         u16 edge;
  65         unsigned long flags;
  66
  67         spin_lock_irqsave(&asic->lock, flags);
  68         edge = asic3_read_register(asic,
  69                                    base + ASIC3_GPIO_EDGE_TRIGGER);
  70         edge ^= bit;
  71         asic3_write_register(asic,
  72                              base + ASIC3_GPIO_EDGE_TRIGGER, edge);
  73         spin_unlock_irqrestore(&asic->lock, flags);
  74 }
  75
  76 static void asic3_irq_demux(unsigned int irq, struct irq_desc *desc)
  77 {
  78         int iter, i;
  79         unsigned long flags;
  80         struct asic3 *asic;
  81
  82         desc->chip->ack(irq);
  83
  84         asic = desc->handler_data;
  85
  86         for (iter = 0 ; iter < MAX_ASIC_ISR_LOOPS; iter++) {
  87                 u32 status;
  88                 int bank;
  89
  90                 spin_lock_irqsave(&asic->lock, flags);
  91                 status = asic3_read_register(asic,
  92                                              ASIC3_OFFSET(INTR, P_INT_STAT));
  93                 spin_unlock_irqrestore(&asic->lock, flags);
  94
  95                 /* Check all ten register bits */
  96                 if ((status & 0x3ff) == 0)
  97                         break;
  98
  99                 /* Handle GPIO IRQs */
 100                 for (bank = 0; bank < ASIC3_NUM_GPIO_BANKS; bank++) {
 101                         if (status & (1 << bank)) {
 102                                 unsigned long base, istat;
 103
 104                                 base = ASIC3_GPIO_A_BASE
 105                                        + bank * ASIC3_GPIO_BASE_INCR;
 106
 107                                 spin_lock_irqsave(&asic->lock, flags);
 108                                 istat = asic3_read_register(asic,
 109                                                             base +
 110                                                             ASIC3_GPIO_INT_STATUS);
 111                                 /* Clearing IntStatus */
 112                                 asic3_write_register(asic,
 113                                                      base +
 114                                                      ASIC3_GPIO_INT_STATUS, 0);
 115                                 spin_unlock_irqrestore(&asic->lock, flags);
 116
 117                                 for (i = 0; i < ASIC3_GPIOS_PER_BANK; i++) {
 118                                         int bit = (1 << i);
 119                                         unsigned int irqnr;
 120
 121                                         if (!(istat & bit))
 122                                                 continue;
 123
 124                                         irqnr = asic->irq_base +
 125                                                 (ASIC3_GPIOS_PER_BANK * bank)
 126                                                 + i;
 127                                         desc = irq_desc + irqnr;
 128                                         desc->handle_irq(irqnr, desc);
 129                                         if (asic->irq_bothedge[bank] & bit)
 130                                                 asic3_irq_flip_edge(asic, base,
 131                                                                     bit);
 132                                 }
 133                         }
 134                 }
 135
 136                 /* Handle remaining IRQs in the status register */
 137                 for (i = ASIC3_NUM_GPIOS; i < ASIC3_NR_IRQS; i++) {
 138                         /* They start at bit 4 and go up */
 139                         if (status & (1 << (i - ASIC3_NUM_GPIOS + 4))) {
 140                                 desc = irq_desc + asic->irq_base + i;
 141                                 desc->handle_irq(asic->irq_base + i,
 142                                                  desc);
 143                         }
 144                 }
 145         }
 146
 147         if (iter >= MAX_ASIC_ISR_LOOPS)
 148                 dev_err(asic->dev, "interrupt processing overrun\n");
 149 }
 150
 151 static inline int asic3_irq_to_bank(struct asic3 *asic, int irq)
 152 {
 153         int n;
 154
 155         n = (irq - asic->irq_base) >> 4;
 156
 157         return (n * (ASIC3_GPIO_B_BASE - ASIC3_GPIO_A_BASE));
 158 }
 159
 160 static inline int asic3_irq_to_index(struct asic3 *asic, int irq)
 161 {
 162         return (irq - asic->irq_base) & 0xf;
 163 }
 164
 165 static void asic3_mask_gpio_irq(unsigned int irq)
 166 {
 167         struct asic3 *asic = get_irq_chip_data(irq);
 168         u32 val, bank, index;
 169         unsigned long flags;
 170
 171         bank = asic3_irq_to_bank(asic, irq);
 172         index = asic3_irq_to_index(asic, irq);
 173
 174         spin_lock_irqsave(&asic->lock, flags);
 175         val = asic3_read_register(asic, bank + ASIC3_GPIO_MASK);
 176         val |= 1 << index;
 177         asic3_write_register(asic, bank + ASIC3_GPIO_MASK, val);
 178         spin_unlock_irqrestore(&asic->lock, flags);
 179 }
 180
 181 static void asic3_mask_irq(unsigned int irq)
 182 {
 183         struct asic3 *asic = get_irq_chip_data(irq);
 184         int regval;
 185         unsigned long flags;
 186
 187         spin_lock_irqsave(&asic->lock, flags);
 188         regval = asic3_read_register(asic,
 189                                      ASIC3_INTR_BASE +
 190                                      ASIC3_INTR_INT_MASK);
 191
 192         regval &= ~(ASIC3_INTMASK_MASK0 <<
 193                     (irq - (asic->irq_base + ASIC3_NUM_GPIOS)));
 194
 195         asic3_write_register(asic,
 196                              ASIC3_INTR_BASE +
 197                              ASIC3_INTR_INT_MASK,
 198                              regval);
 199         spin_unlock_irqrestore(&asic->lock, flags);
 200 }
 201
 202 static void asic3_unmask_gpio_irq(unsigned int irq)
 203 {
 204         struct asic3 *asic = get_irq_chip_data(irq);
 205         u32 val, bank, index;
 206         unsigned long flags;
 207
 208         bank = asic3_irq_to_bank(asic, irq);
 209         index = asic3_irq_to_index(asic, irq);
 210
 211         spin_lock_irqsave(&asic->lock, flags);
 212         val = asic3_read_register(asic, bank + ASIC3_GPIO_MASK);
 213         val &= ~(1 << index);
 214         asic3_write_register(asic, bank + ASIC3_GPIO_MASK, val);
 215         spin_unlock_irqrestore(&asic->lock, flags);
 216 }
 217
 218 static void asic3_unmask_irq(unsigned int irq)
 219 {
 220         struct asic3 *asic = get_irq_chip_data(irq);
 221         int regval;
 222         unsigned long flags;
 223
 224         spin_lock_irqsave(&asic->lock, flags);
 225         regval = asic3_read_register(asic,
 226                                      ASIC3_INTR_BASE +
 227                                      ASIC3_INTR_INT_MASK);
 228
 229         regval |= (ASIC3_INTMASK_MASK0 <<
 230                    (irq - (asic->irq_base + ASIC3_NUM_GPIOS)));
 231
 232         asic3_write_register(asic,
 233                              ASIC3_INTR_BASE +
 234                              ASIC3_INTR_INT_MASK,
 235                              regval);
 236         spin_unlock_irqrestore(&asic->lock, flags);
 237 }
 238
 239 static int asic3_gpio_irq_type(unsigned int irq, unsigned int type)
 240 {
 241         struct asic3 *asic = get_irq_chip_data(irq);
 242         u32 bank, index;
 243         u16 trigger, level, edge, bit;
 244         unsigned long flags;
 245
 246         bank = asic3_irq_to_bank(asic, irq);
 247         index = asic3_irq_to_index(asic, irq);
 248         bit = 1<<index;
 249
 250         spin_lock_irqsave(&asic->lock, flags);
 251         level = asic3_read_register(asic,
 252                                     bank + ASIC3_GPIO_LEVEL_TRIGGER);
 253         edge = asic3_read_register(asic,
 254                                    bank + ASIC3_GPIO_EDGE_TRIGGER);
 255         trigger = asic3_read_register(asic,
 256                                       bank + ASIC3_GPIO_TRIGGER_TYPE);
 257         asic->irq_bothedge[(irq - asic->irq_base) >> 4] &= ~bit;
 258
 259         if (type == IRQ_TYPE_EDGE_RISING) {
 260                 trigger |= bit;
 261                 edge |= bit;
 262         } else if (type == IRQ_TYPE_EDGE_FALLING) {
 263                 trigger |= bit;
 264                 edge &= ~bit;
 265         } else if (type == IRQ_TYPE_EDGE_BOTH) {
 266                 trigger |= bit;
 267                 if (asic3_gpio_get(&asic->gpio, irq - asic->irq_base))
 268                         edge &= ~bit;
 269                 else
 270                         edge |= bit;
 271                 asic->irq_bothedge[(irq - asic->irq_base) >> 4] |= bit;
 272         } else if (type == IRQ_TYPE_LEVEL_LOW) {
 273                 trigger &= ~bit;
 274                 level &= ~bit;
 275         } else if (type == IRQ_TYPE_LEVEL_HIGH) {
 276                 trigger &= ~bit;
 277                 level |= bit;
 278         } else {
 279                 /*
 280                  * if type == IRQ_TYPE_NONE, we should mask interrupts, but
 281                  * be careful to not unmask them if mask was also called.
 282                  * Probably need internal state for mask.
 283                  */
 284                 dev_notice(asic->dev, "irq type not changed\n");
 285         }
 286         asic3_write_register(asic, bank + ASIC3_GPIO_LEVEL_TRIGGER,
 287                              level);
 288         asic3_write_register(asic, bank + ASIC3_GPIO_EDGE_TRIGGER,
 289                              edge);
 290         asic3_write_register(asic, bank + ASIC3_GPIO_TRIGGER_TYPE,
 291                              trigger);
 292         spin_unlock_irqrestore(&asic->lock, flags);
 293         return 0;
 294 }
 295
 296 static struct irq_chip asic3_gpio_irq_chip = {
 297         .name           = "ASIC3-GPIO",
 298         .ack            = asic3_mask_gpio_irq,
 299         .mask           = asic3_mask_gpio_irq,
 300         .unmask         = asic3_unmask_gpio_irq,
 301         .set_type       = asic3_gpio_irq_type,
 302 };
 303
 304 static struct irq_chip asic3_irq_chip = {
 305         .name           = "ASIC3",
 306         .ack            = asic3_mask_irq,
 307         .mask           = asic3_mask_irq,
 308         .unmask         = asic3_unmask_irq,
 309 };
 310
 311 static int __init asic3_irq_probe(struct platform_device *pdev)
 312 {
 313         struct asic3 *asic = platform_get_drvdata(pdev);
 314         unsigned long clksel = 0;
 315         unsigned int irq, irq_base;
 316         int map_size;
 317         int ret;
 318
 319         ret = platform_get_irq(pdev, 0);
 320         if (ret < 0)
 321                 return ret;
 322         asic->irq_nr = ret;
 323
 324         /* turn on clock to IRQ controller */
 325         clksel |= CLOCK_SEL_CX;
 326         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL),
 327                              clksel);
 328
 329         irq_base = asic->irq_base;
 330
 331         for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) {
 332                 if (irq < asic->irq_base + ASIC3_NUM_GPIOS)
 333                         set_irq_chip(irq, &asic3_gpio_irq_chip);
 334                 else
 335                         set_irq_chip(irq, &asic3_irq_chip);
 336
 337                 set_irq_chip_data(irq, asic);
 338                 set_irq_handler(irq, handle_level_irq);
 339                 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 340         }
 341
 342         asic3_write_register(asic, ASIC3_OFFSET(INTR, INT_MASK),
 343                              ASIC3_INTMASK_GINTMASK);
 344
 345         set_irq_chained_handler(asic->irq_nr, asic3_irq_demux);
 346         set_irq_type(asic->irq_nr, IRQ_TYPE_EDGE_RISING);
 347         set_irq_data(asic->irq_nr, asic);
 348
 349         return 0;
 350 }
 351
 352 static void asic3_irq_remove(struct platform_device *pdev)
 353 {
 354         struct asic3 *asic = platform_get_drvdata(pdev);
 355         unsigned int irq, irq_base;
 356
 357         irq_base = asic->irq_base;
 358
 359         for (irq = irq_base; irq < irq_base + ASIC3_NR_IRQS; irq++) {
 360                 set_irq_flags(irq, 0);
 361                 set_irq_handler(irq, NULL);
 362                 set_irq_chip(irq, NULL);
 363                 set_irq_chip_data(irq, NULL);
 364         }
 365         set_irq_chained_handler(asic->irq_nr, NULL);
 366 }
 367
 368 /* GPIOs */
 369 static int asic3_gpio_direction(struct gpio_chip *chip,
 370                                 unsigned offset, int out)
 371 {
 372         u32 mask = ASIC3_GPIO_TO_MASK(offset), out_reg;
 373         unsigned int gpio_base;
 374         unsigned long flags;
 375         struct asic3 *asic;
 376
 377         asic = container_of(chip, struct asic3, gpio);
 378         gpio_base = ASIC3_GPIO_TO_BASE(offset);
 379
 380         if (gpio_base > ASIC3_GPIO_D_BASE) {
 381                 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
 382                         gpio_base, offset);
 383                 return -EINVAL;
 384         }
 385
 386         spin_lock_irqsave(&asic->lock, flags);
 387
 388         out_reg = asic3_read_register(asic, gpio_base + ASIC3_GPIO_DIRECTION);
 389
 390         /* Input is 0, Output is 1 */
 391         if (out)
 392                 out_reg |= mask;
 393         else
 394                 out_reg &= ~mask;
 395
 396         asic3_write_register(asic, gpio_base + ASIC3_GPIO_DIRECTION, out_reg);
 397
 398         spin_unlock_irqrestore(&asic->lock, flags);
 399
 400         return 0;
 401
 402 }
 403
 404 static int asic3_gpio_direction_input(struct gpio_chip *chip,
 405                                       unsigned offset)
 406 {
 407         return asic3_gpio_direction(chip, offset, 0);
 408 }
 409
 410 static int asic3_gpio_direction_output(struct gpio_chip *chip,
 411                                        unsigned offset, int value)
 412 {
 413         return asic3_gpio_direction(chip, offset, 1);
 414 }
 415
 416 static int asic3_gpio_get(struct gpio_chip *chip,
 417                           unsigned offset)
 418 {
 419         unsigned int gpio_base;
 420         u32 mask = ASIC3_GPIO_TO_MASK(offset);
 421         struct asic3 *asic;
 422
 423         asic = container_of(chip, struct asic3, gpio);
 424         gpio_base = ASIC3_GPIO_TO_BASE(offset);
 425
 426         if (gpio_base > ASIC3_GPIO_D_BASE) {
 427                 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
 428                         gpio_base, offset);
 429                 return -EINVAL;
 430         }
 431
 432         return asic3_read_register(asic, gpio_base + ASIC3_GPIO_STATUS) & mask;
 433 }
 434
 435 static void asic3_gpio_set(struct gpio_chip *chip,
 436                            unsigned offset, int value)
 437 {
 438         u32 mask, out_reg;
 439         unsigned int gpio_base;
 440         unsigned long flags;
 441         struct asic3 *asic;
 442
 443         asic = container_of(chip, struct asic3, gpio);
 444         gpio_base = ASIC3_GPIO_TO_BASE(offset);
 445
 446         if (gpio_base > ASIC3_GPIO_D_BASE) {
 447                 dev_err(asic->dev, "Invalid base (0x%x) for gpio %d\n",
 448                         gpio_base, offset);
 449                 return;
 450         }
 451
 452         mask = ASIC3_GPIO_TO_MASK(offset);
 453
 454         spin_lock_irqsave(&asic->lock, flags);
 455
 456         out_reg = asic3_read_register(asic, gpio_base + ASIC3_GPIO_OUT);
 457
 458         if (value)
 459                 out_reg |= mask;
 460         else
 461                 out_reg &= ~mask;
 462
 463         asic3_write_register(asic, gpio_base + ASIC3_GPIO_OUT, out_reg);
 464
 465         spin_unlock_irqrestore(&asic->lock, flags);
 466
 467         return;
 468 }
 469
 470 static __init int asic3_gpio_probe(struct platform_device *pdev,
 471                                    u16 *gpio_config, int num)
 472 {
 473         struct asic3 *asic = platform_get_drvdata(pdev);
 474         u16 alt_reg[ASIC3_NUM_GPIO_BANKS];
 475         u16 out_reg[ASIC3_NUM_GPIO_BANKS];
 476         u16 dir_reg[ASIC3_NUM_GPIO_BANKS];
 477         int i;
 478
 479         memzero(alt_reg, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
 480         memzero(out_reg, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
 481         memzero(dir_reg, ASIC3_NUM_GPIO_BANKS * sizeof(u16));
 482
 483         /* Enable all GPIOs */
 484         asic3_write_register(asic, ASIC3_GPIO_OFFSET(A, MASK), 0xffff);
 485         asic3_write_register(asic, ASIC3_GPIO_OFFSET(B, MASK), 0xffff);
 486         asic3_write_register(asic, ASIC3_GPIO_OFFSET(C, MASK), 0xffff);
 487         asic3_write_register(asic, ASIC3_GPIO_OFFSET(D, MASK), 0xffff);
 488
 489         for (i = 0; i < num; i++) {
 490                 u8 alt, pin, dir, init, bank_num, bit_num;
 491                 u16 config = gpio_config[i];
 492
 493                 pin = ASIC3_CONFIG_GPIO_PIN(config);
 494                 alt = ASIC3_CONFIG_GPIO_ALT(config);
 495                 dir = ASIC3_CONFIG_GPIO_DIR(config);
 496                 init = ASIC3_CONFIG_GPIO_INIT(config);
 497
 498                 bank_num = ASIC3_GPIO_TO_BANK(pin);
 499                 bit_num = ASIC3_GPIO_TO_BIT(pin);
 500
 501                 alt_reg[bank_num] |= (alt << bit_num);
 502                 out_reg[bank_num] |= (init << bit_num);
 503                 dir_reg[bank_num] |= (dir << bit_num);
 504         }
 505
 506         for (i = 0; i < ASIC3_NUM_GPIO_BANKS; i++) {
 507                 asic3_write_register(asic,
 508                                      ASIC3_BANK_TO_BASE(i) +
 509                                      ASIC3_GPIO_DIRECTION,
 510                                      dir_reg[i]);
 511                 asic3_write_register(asic,
 512                                      ASIC3_BANK_TO_BASE(i) + ASIC3_GPIO_OUT,
 513                                      out_reg[i]);
 514                 asic3_write_register(asic,
 515                                      ASIC3_BANK_TO_BASE(i) +
 516                                      ASIC3_GPIO_ALT_FUNCTION,
 517                                      alt_reg[i]);
 518         }
 519
 520         return gpiochip_add(&asic->gpio);
 521 }
 522
 523 static int asic3_gpio_remove(struct platform_device *pdev)
 524 {
 525         struct asic3 *asic = platform_get_drvdata(pdev);
 526
 527         return gpiochip_remove(&asic->gpio);
 528 }
 529
 530
 531 /* Core */
 532 static int __init asic3_probe(struct platform_device *pdev)
 533 {
 534         struct asic3_platform_data *pdata = pdev->dev.platform_data;
 535         struct asic3 *asic;
 536         struct resource *mem;
 537         unsigned long clksel;
 538         int ret = 0;
 539
 540         asic = kzalloc(sizeof(struct asic3), GFP_KERNEL);
 541         if (asic == NULL) {
 542                 printk(KERN_ERR "kzalloc failed\n");
 543                 return -ENOMEM;
 544         }
 545
 546         spin_lock_init(&asic->lock);
 547         platform_set_drvdata(pdev, asic);
 548         asic->dev = &pdev->dev;
 549
 550         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 551         if (!mem) {
 552                 ret = -ENOMEM;
 553                 dev_err(asic->dev, "no MEM resource\n");
 554                 goto out_free;
 555         }
 556
 557         map_size = mem->end - mem->start + 1;
 558         asic->mapping = ioremap(mem->start, map_size);
 559         if (!asic->mapping) {
 560                 ret = -ENOMEM;
 561                 dev_err(asic->dev, "Couldn't ioremap\n");
 562                 goto out_free;
 563         }
 564
 565         asic->irq_base = pdata->irq_base;
 566
 567         /* calculate bus shift from mem resource */
 568         asic->bus_shift = 2 - (map_size >> 12);
 569
 570         clksel = 0;
 571         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), clksel);
 572
 573         ret = asic3_irq_probe(pdev);
 574         if (ret < 0) {
 575                 dev_err(asic->dev, "Couldn't probe IRQs\n");
 576                 goto out_unmap;
 577         }
 578
 579         asic->gpio.base = pdata->gpio_base;
 580         asic->gpio.ngpio = ASIC3_NUM_GPIOS;
 581         asic->gpio.get = asic3_gpio_get;
 582         asic->gpio.set = asic3_gpio_set;
 583         asic->gpio.direction_input = asic3_gpio_direction_input;
 584         asic->gpio.direction_output = asic3_gpio_direction_output;
 585
 586         ret = asic3_gpio_probe(pdev,
 587                                pdata->gpio_config,
 588                                pdata->gpio_config_num);
 589         if (ret < 0) {
 590                 dev_err(asic->dev, "GPIO probe failed\n");
 591                 goto out_irq;
 592         }
 593
 594         dev_info(asic->dev, "ASIC3 Core driver\n");
 595
 596         return 0;
 597
 598  out_irq:
 599         asic3_irq_remove(pdev);
 600
 601  out_unmap:
 602         iounmap(asic->mapping);
 603
 604  out_free:
 605         kfree(asic);
 606
 607         return ret;
 608 }
 609
 610 static int asic3_remove(struct platform_device *pdev)
 611 {
 612         int ret;
 613         struct asic3 *asic = platform_get_drvdata(pdev);
 614
 615         ret = asic3_gpio_remove(pdev);
 616         if (ret < 0)
 617                 return ret;
 618         asic3_irq_remove(pdev);
 619
 620         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), 0);
 621
 622         iounmap(asic->mapping);
 623
 624         kfree(asic);
 625
 626         return 0;
 627 }
 628
 629 static void asic3_shutdown(struct platform_device *pdev)
 630 {
 631 }
 632
 633 static struct platform_driver asic3_device_driver = {
 634         .driver         = {
 635                 .name   = "asic3",
 636         },
 637         .remove         = __devexit_p(asic3_remove),
 638         .shutdown       = asic3_shutdown,
 639 };
 640
 641 static int __init asic3_init(void)
 642 {
 643         int retval = 0;
 644         retval = platform_driver_probe(&asic3_device_driver, asic3_probe);
 645         return retval;
 646 }
 647
 648 subsys_initcall(asic3_init);