drivers/rtc/rtc-twl.c

   1 /*
   2  * rtc-twl.c -- TWL Real Time Clock interface
   3  *
   4  * Copyright (C) 2007 MontaVista Software, Inc
   5  * Author: Alexandre Rusev <source@mvista.com>
   6  *
   7  * Based on original TI driver twl4030-rtc.c
   8  *   Copyright (C) 2006 Texas Instruments, Inc.
   9  *
  10  * Based on rtc-omap.c
  11  *   Copyright (C) 2003 MontaVista Software, Inc.
  12  *   Author: George G. Davis <gdavis@mvista.com> or <source@mvista.com>
  13  *   Copyright (C) 2006 David Brownell
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version
  18  * 2 of the License, or (at your option) any later version.
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/errno.h>
  23 #include <linux/init.h>
  24 #include <linux/module.h>
  25 #include <linux/types.h>
  26 #include <linux/rtc.h>
  27 #include <linux/bcd.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/interrupt.h>
  30
  31 #include <linux/i2c/twl.h>
  32
  33
  34 /*
  35  * RTC block register offsets (use TWL_MODULE_RTC)
  36  */
  37 enum {
  38         REG_SECONDS_REG = 0,
  39         REG_MINUTES_REG,
  40         REG_HOURS_REG,
  41         REG_DAYS_REG,
  42         REG_MONTHS_REG,
  43         REG_YEARS_REG,
  44         REG_WEEKS_REG,
  45
  46         REG_ALARM_SECONDS_REG,
  47         REG_ALARM_MINUTES_REG,
  48         REG_ALARM_HOURS_REG,
  49         REG_ALARM_DAYS_REG,
  50         REG_ALARM_MONTHS_REG,
  51         REG_ALARM_YEARS_REG,
  52
  53         REG_RTC_CTRL_REG,
  54         REG_RTC_STATUS_REG,
  55         REG_RTC_INTERRUPTS_REG,
  56
  57         REG_RTC_COMP_LSB_REG,
  58         REG_RTC_COMP_MSB_REG,
  59 };
  60 const static u8 twl4030_rtc_reg_map[] = {
  61         [REG_SECONDS_REG] = 0x00,
  62         [REG_MINUTES_REG] = 0x01,
  63         [REG_HOURS_REG] = 0x02,
  64         [REG_DAYS_REG] = 0x03,
  65         [REG_MONTHS_REG] = 0x04,
  66         [REG_YEARS_REG] = 0x05,
  67         [REG_WEEKS_REG] = 0x06,
  68
  69         [REG_ALARM_SECONDS_REG] = 0x07,
  70         [REG_ALARM_MINUTES_REG] = 0x08,
  71         [REG_ALARM_HOURS_REG] = 0x09,
  72         [REG_ALARM_DAYS_REG] = 0x0A,
  73         [REG_ALARM_MONTHS_REG] = 0x0B,
  74         [REG_ALARM_YEARS_REG] = 0x0C,
  75
  76         [REG_RTC_CTRL_REG] = 0x0D,
  77         [REG_RTC_STATUS_REG] = 0x0E,
  78         [REG_RTC_INTERRUPTS_REG] = 0x0F,
  79
  80         [REG_RTC_COMP_LSB_REG] = 0x10,
  81         [REG_RTC_COMP_MSB_REG] = 0x11,
  82 };
  83 const static u8 twl6030_rtc_reg_map[] = {
  84         [REG_SECONDS_REG] = 0x00,
  85         [REG_MINUTES_REG] = 0x01,
  86         [REG_HOURS_REG] = 0x02,
  87         [REG_DAYS_REG] = 0x03,
  88         [REG_MONTHS_REG] = 0x04,
  89         [REG_YEARS_REG] = 0x05,
  90         [REG_WEEKS_REG] = 0x06,
  91
  92         [REG_ALARM_SECONDS_REG] = 0x08,
  93         [REG_ALARM_MINUTES_REG] = 0x09,
  94         [REG_ALARM_HOURS_REG] = 0x0A,
  95         [REG_ALARM_DAYS_REG] = 0x0B,
  96         [REG_ALARM_MONTHS_REG] = 0x0C,
  97         [REG_ALARM_YEARS_REG] = 0x0D,
  98
  99         [REG_RTC_CTRL_REG] = 0x10,
 100         [REG_RTC_STATUS_REG] = 0x11,
 101         [REG_RTC_INTERRUPTS_REG] = 0x12,
 102
 103         [REG_RTC_COMP_LSB_REG] = 0x13,
 104         [REG_RTC_COMP_MSB_REG] = 0x14,
 105 };
 106
 107 /* RTC_CTRL_REG bitfields */
 108 #define BIT_RTC_CTRL_REG_STOP_RTC_M              0x01
 109 #define BIT_RTC_CTRL_REG_ROUND_30S_M             0x02
 110 #define BIT_RTC_CTRL_REG_AUTO_COMP_M             0x04
 111 #define BIT_RTC_CTRL_REG_MODE_12_24_M            0x08
 112 #define BIT_RTC_CTRL_REG_TEST_MODE_M             0x10
 113 #define BIT_RTC_CTRL_REG_SET_32_COUNTER_M        0x20
 114 #define BIT_RTC_CTRL_REG_GET_TIME_M              0x40
 115
 116 /* RTC_STATUS_REG bitfields */
 117 #define BIT_RTC_STATUS_REG_RUN_M                 0x02
 118 #define BIT_RTC_STATUS_REG_1S_EVENT_M            0x04
 119 #define BIT_RTC_STATUS_REG_1M_EVENT_M            0x08
 120 #define BIT_RTC_STATUS_REG_1H_EVENT_M            0x10
 121 #define BIT_RTC_STATUS_REG_1D_EVENT_M            0x20
 122 #define BIT_RTC_STATUS_REG_ALARM_M               0x40
 123 #define BIT_RTC_STATUS_REG_POWER_UP_M            0x80
 124
 125 /* RTC_INTERRUPTS_REG bitfields */
 126 #define BIT_RTC_INTERRUPTS_REG_EVERY_M           0x03
 127 #define BIT_RTC_INTERRUPTS_REG_IT_TIMER_M        0x04
 128 #define BIT_RTC_INTERRUPTS_REG_IT_ALARM_M        0x08
 129
 130
 131 /* REG_SECONDS_REG through REG_YEARS_REG is how many registers? */
 132 #define ALL_TIME_REGS           6
 133
 134 /*----------------------------------------------------------------------*/
 135 static u8  *rtc_reg_map;
 136
 137 /*
 138  * Supports 1 byte read from TWL RTC register.
 139  */
 140 static int twl_rtc_read_u8(u8 *data, u8 reg)
 141 {
 142         int ret;
 143
 144         ret = twl_i2c_read_u8(TWL_MODULE_RTC, data, (rtc_reg_map[reg]));
 145         if (ret < 0)
 146                 pr_err("twl_rtc: Could not read TWL"
 147                        "register %X - error %d\n", reg, ret);
 148         return ret;
 149 }
 150
 151 /*
 152  * Supports 1 byte write to TWL RTC registers.
 153  */
 154 static int twl_rtc_write_u8(u8 data, u8 reg)
 155 {
 156         int ret;
 157
 158         ret = twl_i2c_write_u8(TWL_MODULE_RTC, data, (rtc_reg_map[reg]));
 159         if (ret < 0)
 160                 pr_err("twl_rtc: Could not write TWL"
 161                        "register %X - error %d\n", reg, ret);
 162         return ret;
 163 }
 164
 165 /*
 166  * Cache the value for timer/alarm interrupts register; this is
 167  * only changed by callers holding rtc ops lock (or resume).
 168  */
 169 static unsigned char rtc_irq_bits;
 170
 171 /*
 172  * Enable 1/second update and/or alarm interrupts.
 173  */
 174 static int set_rtc_irq_bit(unsigned char bit)
 175 {
 176         unsigned char val;
 177         int ret;
 178
 179         val = rtc_irq_bits | bit;
 180         val &= ~BIT_RTC_INTERRUPTS_REG_EVERY_M;
 181         ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
 182         if (ret == 0)
 183                 rtc_irq_bits = val;
 184
 185         return ret;
 186 }
 187
 188 /*
 189  * Disable update and/or alarm interrupts.
 190  */
 191 static int mask_rtc_irq_bit(unsigned char bit)
 192 {
 193         unsigned char val;
 194         int ret;
 195
 196         val = rtc_irq_bits & ~bit;
 197         ret = twl_rtc_write_u8(val, REG_RTC_INTERRUPTS_REG);
 198         if (ret == 0)
 199                 rtc_irq_bits = val;
 200
 201         return ret;
 202 }
 203
 204 static int twl_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
 205 {
 206         int ret;
 207
 208         if (enabled)
 209                 ret = set_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
 210         else
 211                 ret = mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
 212
 213         return ret;
 214 }
 215
 216 static int twl_rtc_update_irq_enable(struct device *dev, unsigned enabled)
 217 {
 218         int ret;
 219
 220         if (enabled)
 221                 ret = set_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
 222         else
 223                 ret = mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
 224
 225         return ret;
 226 }
 227
 228 /*
 229  * Gets current TWL RTC time and date parameters.
 230  *
 231  * The RTC's time/alarm representation is not what gmtime(3) requires
 232  * Linux to use:
 233  *
 234  *  - Months are 1..12 vs Linux 0-11
 235  *  - Years are 0..99 vs Linux 1900..N (we assume 21st century)
 236  */
 237 static int twl_rtc_read_time(struct device *dev, struct rtc_time *tm)
 238 {
 239         unsigned char rtc_data[ALL_TIME_REGS + 1];
 240         int ret;
 241         u8 save_control;
 242
 243         ret = twl_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
 244         if (ret < 0)
 245                 return ret;
 246
 247         save_control |= BIT_RTC_CTRL_REG_GET_TIME_M;
 248
 249         ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
 250         if (ret < 0)
 251                 return ret;
 252
 253         ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
 254                         (rtc_reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
 255
 256         if (ret < 0) {
 257                 dev_err(dev, "rtc_read_time error %d\n", ret);
 258                 return ret;
 259         }
 260
 261         tm->tm_sec = bcd2bin(rtc_data[0]);
 262         tm->tm_min = bcd2bin(rtc_data[1]);
 263         tm->tm_hour = bcd2bin(rtc_data[2]);
 264         tm->tm_mday = bcd2bin(rtc_data[3]);
 265         tm->tm_mon = bcd2bin(rtc_data[4]) - 1;
 266         tm->tm_year = bcd2bin(rtc_data[5]) + 100;
 267
 268         return ret;
 269 }
 270
 271 static int twl_rtc_set_time(struct device *dev, struct rtc_time *tm)
 272 {
 273         unsigned char save_control;
 274         unsigned char rtc_data[ALL_TIME_REGS + 1];
 275         int ret;
 276
 277         rtc_data[1] = bin2bcd(tm->tm_sec);
 278         rtc_data[2] = bin2bcd(tm->tm_min);
 279         rtc_data[3] = bin2bcd(tm->tm_hour);
 280         rtc_data[4] = bin2bcd(tm->tm_mday);
 281         rtc_data[5] = bin2bcd(tm->tm_mon + 1);
 282         rtc_data[6] = bin2bcd(tm->tm_year - 100);
 283
 284         /* Stop RTC while updating the TC registers */
 285         ret = twl_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
 286         if (ret < 0)
 287                 goto out;
 288
 289         save_control &= ~BIT_RTC_CTRL_REG_STOP_RTC_M;
 290         twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
 291         if (ret < 0)
 292                 goto out;
 293
 294         /* update all the time registers in one shot */
 295         ret = twl_i2c_write(TWL_MODULE_RTC, rtc_data,
 296                 (rtc_reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
 297         if (ret < 0) {
 298                 dev_err(dev, "rtc_set_time error %d\n", ret);
 299                 goto out;
 300         }
 301
 302         /* Start back RTC */
 303         save_control |= BIT_RTC_CTRL_REG_STOP_RTC_M;
 304         ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
 305
 306 out:
 307         return ret;
 308 }
 309
 310 /*
 311  * Gets current TWL RTC alarm time.
 312  */
 313 static int twl_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
 314 {
 315         unsigned char rtc_data[ALL_TIME_REGS + 1];
 316         int ret;
 317
 318         ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
 319                         (rtc_reg_map[REG_ALARM_SECONDS_REG]), ALL_TIME_REGS);
 320         if (ret < 0) {
 321                 dev_err(dev, "rtc_read_alarm error %d\n", ret);
 322                 return ret;
 323         }
 324
 325         /* some of these fields may be wildcard/"match all" */
 326         alm->time.tm_sec = bcd2bin(rtc_data[0]);
 327         alm->time.tm_min = bcd2bin(rtc_data[1]);
 328         alm->time.tm_hour = bcd2bin(rtc_data[2]);
 329         alm->time.tm_mday = bcd2bin(rtc_data[3]);
 330         alm->time.tm_mon = bcd2bin(rtc_data[4]) - 1;
 331         alm->time.tm_year = bcd2bin(rtc_data[5]) + 100;
 332
 333         /* report cached alarm enable state */
 334         if (rtc_irq_bits & BIT_RTC_INTERRUPTS_REG_IT_ALARM_M)
 335                 alm->enabled = 1;
 336
 337         return ret;
 338 }
 339
 340 static int twl_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
 341 {
 342         unsigned char alarm_data[ALL_TIME_REGS + 1];
 343         int ret;
 344
 345         ret = twl_rtc_alarm_irq_enable(dev, 0);
 346         if (ret)
 347                 goto out;
 348
 349         alarm_data[1] = bin2bcd(alm->time.tm_sec);
 350         alarm_data[2] = bin2bcd(alm->time.tm_min);
 351         alarm_data[3] = bin2bcd(alm->time.tm_hour);
 352         alarm_data[4] = bin2bcd(alm->time.tm_mday);
 353         alarm_data[5] = bin2bcd(alm->time.tm_mon + 1);
 354         alarm_data[6] = bin2bcd(alm->time.tm_year - 100);
 355
 356         /* update all the alarm registers in one shot */
 357         ret = twl_i2c_write(TWL_MODULE_RTC, alarm_data,
 358                 (rtc_reg_map[REG_ALARM_SECONDS_REG]), ALL_TIME_REGS);
 359         if (ret) {
 360                 dev_err(dev, "rtc_set_alarm error %d\n", ret);
 361                 goto out;
 362         }
 363
 364         if (alm->enabled)
 365                 ret = twl_rtc_alarm_irq_enable(dev, 1);
 366 out:
 367         return ret;
 368 }
 369
 370 static irqreturn_t twl_rtc_interrupt(int irq, void *rtc)
 371 {
 372         unsigned long events = 0;
 373         int ret = IRQ_NONE;
 374         int res;
 375         u8 rd_reg;
 376
 377 #ifdef CONFIG_LOCKDEP
 378         /* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which
 379          * we don't want and can't tolerate.  Although it might be
 380          * friendlier not to borrow this thread context...
 381          */
 382         local_irq_enable();
 383 #endif
 384
 385         res = twl_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
 386         if (res)
 387                 goto out;
 388         /*
 389          * Figure out source of interrupt: ALARM or TIMER in RTC_STATUS_REG.
 390          * only one (ALARM or RTC) interrupt source may be enabled
 391          * at time, we also could check our results
 392          * by reading RTS_INTERRUPTS_REGISTER[IT_TIMER,IT_ALARM]
 393          */
 394         if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
 395                 events |= RTC_IRQF | RTC_AF;
 396         else
 397                 events |= RTC_IRQF | RTC_UF;
 398
 399         res = twl_rtc_write_u8(rd_reg | BIT_RTC_STATUS_REG_ALARM_M,
 400                                    REG_RTC_STATUS_REG);
 401         if (res)
 402                 goto out;
 403
 404         if (twl_class_is_4030()) {
 405                 /* Clear on Read enabled. RTC_IT bit of TWL4030_INT_PWR_ISR1
 406                  * needs 2 reads to clear the interrupt. One read is done in
 407                  * do_twl_pwrirq(). Doing the second read, to clear
 408                  * the bit.
 409                  *
 410                  * FIXME the reason PWR_ISR1 needs an extra read is that
 411                  * RTC_IF retriggered until we cleared REG_ALARM_M above.
 412                  * But re-reading like this is a bad hack; by doing so we
 413                  * risk wrongly clearing status for some other IRQ (losing
 414                  * the interrupt).  Be smarter about handling RTC_UF ...
 415                  */
 416                 res = twl_i2c_read_u8(TWL4030_MODULE_INT,
 417                         &rd_reg, TWL4030_INT_PWR_ISR1);
 418                 if (res)
 419                         goto out;
 420         }
 421
 422         /* Notify RTC core on event */
 423         rtc_update_irq(rtc, 1, events);
 424
 425         ret = IRQ_HANDLED;
 426 out:
 427         return ret;
 428 }
 429
 430 static struct rtc_class_ops twl_rtc_ops = {
 431         .read_time      = twl_rtc_read_time,
 432         .set_time       = twl_rtc_set_time,
 433         .read_alarm     = twl_rtc_read_alarm,
 434         .set_alarm      = twl_rtc_set_alarm,
 435         .alarm_irq_enable = twl_rtc_alarm_irq_enable,
 436         .update_irq_enable = twl_rtc_update_irq_enable,
 437 };
 438
 439 /*----------------------------------------------------------------------*/
 440
 441 static int __devinit twl_rtc_probe(struct platform_device *pdev)
 442 {
 443         struct rtc_device *rtc;
 444         int ret = 0;
 445         int irq = platform_get_irq(pdev, 0);
 446         u8 rd_reg;
 447
 448         if (irq <= 0)
 449                 return -EINVAL;
 450
 451         rtc = rtc_device_register(pdev->name,
 452                                   &pdev->dev, &twl_rtc_ops, THIS_MODULE);
 453         if (IS_ERR(rtc)) {
 454                 ret = PTR_ERR(rtc);
 455                 dev_err(&pdev->dev, "can't register RTC device, err %ld\n",
 456                         PTR_ERR(rtc));
 457                 goto out0;
 458
 459         }
 460
 461         platform_set_drvdata(pdev, rtc);
 462
 463         ret = twl_rtc_read_u8(&rd_reg, REG_RTC_STATUS_REG);
 464         if (ret < 0)
 465                 goto out1;
 466
 467         if (rd_reg & BIT_RTC_STATUS_REG_POWER_UP_M)
 468                 dev_warn(&pdev->dev, "Power up reset detected.\n");
 469
 470         if (rd_reg & BIT_RTC_STATUS_REG_ALARM_M)
 471                 dev_warn(&pdev->dev, "Pending Alarm interrupt detected.\n");
 472
 473         /* Clear RTC Power up reset and pending alarm interrupts */
 474         ret = twl_rtc_write_u8(rd_reg, REG_RTC_STATUS_REG);
 475         if (ret < 0)
 476                 goto out1;
 477
 478         ret = request_irq(irq, twl_rtc_interrupt,
 479                                 IRQF_TRIGGER_RISING,
 480                                 dev_name(&rtc->dev), rtc);
 481         if (ret < 0) {
 482                 dev_err(&pdev->dev, "IRQ is not free.\n");
 483                 goto out1;
 484         }
 485
 486         if (twl_class_is_6030()) {
 487                 twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
 488                         REG_INT_MSK_LINE_A);
 489                 twl6030_interrupt_unmask(TWL6030_RTC_INT_MASK,
 490                         REG_INT_MSK_STS_A);
 491         }
 492
 493         /* Check RTC module status, Enable if it is off */
 494         ret = twl_rtc_read_u8(&rd_reg, REG_RTC_CTRL_REG);
 495         if (ret < 0)
 496                 goto out2;
 497
 498         if (!(rd_reg & BIT_RTC_CTRL_REG_STOP_RTC_M)) {
 499                 dev_info(&pdev->dev, "Enabling TWL-RTC.\n");
 500                 rd_reg = BIT_RTC_CTRL_REG_STOP_RTC_M;
 501                 ret = twl_rtc_write_u8(rd_reg, REG_RTC_CTRL_REG);
 502                 if (ret < 0)
 503                         goto out2;
 504         }
 505
 506         /* init cached IRQ enable bits */
 507         ret = twl_rtc_read_u8(&rtc_irq_bits, REG_RTC_INTERRUPTS_REG);
 508         if (ret < 0)
 509                 goto out2;
 510
 511         return ret;
 512
 513 out2:
 514         free_irq(irq, rtc);
 515 out1:
 516         rtc_device_unregister(rtc);
 517 out0:
 518         return ret;
 519 }
 520
 521 /*
 522  * Disable all TWL RTC module interrupts.
 523  * Sets status flag to free.
 524  */
 525 static int __devexit twl_rtc_remove(struct platform_device *pdev)
 526 {
 527         /* leave rtc running, but disable irqs */
 528         struct rtc_device *rtc = platform_get_drvdata(pdev);
 529         int irq = platform_get_irq(pdev, 0);
 530
 531         mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_ALARM_M);
 532         mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
 533         if (twl_class_is_6030()) {
 534                 twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
 535                         REG_INT_MSK_LINE_A);
 536                 twl6030_interrupt_mask(TWL6030_RTC_INT_MASK,
 537                         REG_INT_MSK_STS_A);
 538         }
 539
 540
 541         free_irq(irq, rtc);
 542
 543         rtc_device_unregister(rtc);
 544         platform_set_drvdata(pdev, NULL);
 545         return 0;
 546 }
 547
 548 static void twl_rtc_shutdown(struct platform_device *pdev)
 549 {
 550         /* mask timer interrupts, but leave alarm interrupts on to enable
 551            power-on when alarm is triggered */
 552         mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
 553 }
 554
 555 #ifdef CONFIG_PM
 556
 557 static unsigned char irqstat;
 558
 559 static int twl_rtc_suspend(struct platform_device *pdev, pm_message_t state)
 560 {
 561         irqstat = rtc_irq_bits;
 562
 563         mask_rtc_irq_bit(BIT_RTC_INTERRUPTS_REG_IT_TIMER_M);
 564         return 0;
 565 }
 566
 567 static int twl_rtc_resume(struct platform_device *pdev)
 568 {
 569         set_rtc_irq_bit(irqstat);
 570         return 0;
 571 }
 572
 573 #else
 574 #define twl_rtc_suspend NULL
 575 #define twl_rtc_resume  NULL
 576 #endif
 577
 578 MODULE_ALIAS("platform:twl_rtc");
 579
 580 static struct platform_driver twl4030rtc_driver = {
 581         .probe          = twl_rtc_probe,
 582         .remove         = __devexit_p(twl_rtc_remove),
 583         .shutdown       = twl_rtc_shutdown,
 584         .suspend        = twl_rtc_suspend,
 585         .resume         = twl_rtc_resume,
 586         .driver         = {
 587                 .owner  = THIS_MODULE,
 588                 .name   = "twl_rtc",
 589         },
 590 };
 591
 592 static int __init twl_rtc_init(void)
 593 {
 594         if (twl_class_is_4030())
 595                 rtc_reg_map = (u8 *) twl4030_rtc_reg_map;
 596         else
 597                 rtc_reg_map = (u8 *) twl6030_rtc_reg_map;
 598
 599         return platform_driver_register(&twl4030rtc_driver);
 600 }
 601 module_init(twl_rtc_init);
 602
 603 static void __exit twl_rtc_exit(void)
 604 {
 605         platform_driver_unregister(&twl4030rtc_driver);
 606 }
 607 module_exit(twl_rtc_exit);
 608
 609 MODULE_AUTHOR("Texas Instruments, MontaVista Software");
 610 MODULE_LICENSE("GPL");