linux/drivers/rtc/rtc-rs5c372.c
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   1/*
   2 * An I2C driver for Ricoh RS5C372, R2025S/D and RV5C38[67] RTCs
   3 *
   4 * Copyright (C) 2005 Pavel Mironchik <pmironchik@optifacio.net>
   5 * Copyright (C) 2006 Tower Technologies
   6 * Copyright (C) 2008 Paul Mundt
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12
  13#include <linux/i2c.h>
  14#include <linux/rtc.h>
  15#include <linux/bcd.h>
  16#include <linux/slab.h>
  17#include <linux/module.h>
  18
  19#define DRV_VERSION "0.6"
  20
  21
  22/*
  23 * Ricoh has a family of I2C based RTCs, which differ only slightly from
  24 * each other.  Differences center on pinout (e.g. how many interrupts,
  25 * output clock, etc) and how the control registers are used.  The '372
  26 * is significant only because that's the one this driver first supported.
  27 */
  28#define RS5C372_REG_SECS        0
  29#define RS5C372_REG_MINS        1
  30#define RS5C372_REG_HOURS       2
  31#define RS5C372_REG_WDAY        3
  32#define RS5C372_REG_DAY         4
  33#define RS5C372_REG_MONTH       5
  34#define RS5C372_REG_YEAR        6
  35#define RS5C372_REG_TRIM        7
  36#       define RS5C372_TRIM_XSL         0x80
  37#       define RS5C372_TRIM_MASK        0x7F
  38
  39#define RS5C_REG_ALARM_A_MIN    8                       /* or ALARM_W */
  40#define RS5C_REG_ALARM_A_HOURS  9
  41#define RS5C_REG_ALARM_A_WDAY   10
  42
  43#define RS5C_REG_ALARM_B_MIN    11                      /* or ALARM_D */
  44#define RS5C_REG_ALARM_B_HOURS  12
  45#define RS5C_REG_ALARM_B_WDAY   13                      /* (ALARM_B only) */
  46
  47#define RS5C_REG_CTRL1          14
  48#       define RS5C_CTRL1_AALE          (1 << 7)        /* or WALE */
  49#       define RS5C_CTRL1_BALE          (1 << 6)        /* or DALE */
  50#       define RV5C387_CTRL1_24         (1 << 5)
  51#       define RS5C372A_CTRL1_SL1       (1 << 5)
  52#       define RS5C_CTRL1_CT_MASK       (7 << 0)
  53#       define RS5C_CTRL1_CT0           (0 << 0)        /* no periodic irq */
  54#       define RS5C_CTRL1_CT4           (4 << 0)        /* 1 Hz level irq */
  55#define RS5C_REG_CTRL2          15
  56#       define RS5C372_CTRL2_24         (1 << 5)
  57#       define R2025_CTRL2_XST          (1 << 5)
  58#       define RS5C_CTRL2_XSTP          (1 << 4)        /* only if !R2025S/D */
  59#       define RS5C_CTRL2_CTFG          (1 << 2)
  60#       define RS5C_CTRL2_AAFG          (1 << 1)        /* or WAFG */
  61#       define RS5C_CTRL2_BAFG          (1 << 0)        /* or DAFG */
  62
  63
  64/* to read (style 1) or write registers starting at R */
  65#define RS5C_ADDR(R)            (((R) << 4) | 0)
  66
  67
  68enum rtc_type {
  69        rtc_undef = 0,
  70        rtc_r2025sd,
  71        rtc_rs5c372a,
  72        rtc_rs5c372b,
  73        rtc_rv5c386,
  74        rtc_rv5c387a,
  75};
  76
  77static const struct i2c_device_id rs5c372_id[] = {
  78        { "r2025sd", rtc_r2025sd },
  79        { "rs5c372a", rtc_rs5c372a },
  80        { "rs5c372b", rtc_rs5c372b },
  81        { "rv5c386", rtc_rv5c386 },
  82        { "rv5c387a", rtc_rv5c387a },
  83        { }
  84};
  85MODULE_DEVICE_TABLE(i2c, rs5c372_id);
  86
  87/* REVISIT:  this assumes that:
  88 *  - we're in the 21st century, so it's safe to ignore the century
  89 *    bit for rv5c38[67] (REG_MONTH bit 7);
  90 *  - we should use ALARM_A not ALARM_B (may be wrong on some boards)
  91 */
  92struct rs5c372 {
  93        struct i2c_client       *client;
  94        struct rtc_device       *rtc;
  95        enum rtc_type           type;
  96        unsigned                time24:1;
  97        unsigned                has_irq:1;
  98        unsigned                smbus:1;
  99        char                    buf[17];
 100        char                    *regs;
 101};
 102
 103static int rs5c_get_regs(struct rs5c372 *rs5c)
 104{
 105        struct i2c_client       *client = rs5c->client;
 106        struct i2c_msg          msgs[] = {
 107                { client->addr, I2C_M_RD, sizeof rs5c->buf, rs5c->buf },
 108        };
 109
 110        /* This implements the third reading method from the datasheet, using
 111         * an internal address that's reset after each transaction (by STOP)
 112         * to 0x0f ... so we read extra registers, and skip the first one.
 113         *
 114         * The first method doesn't work with the iop3xx adapter driver, on at
 115         * least 80219 chips; this works around that bug.
 116         *
 117         * The third method on the other hand doesn't work for the SMBus-only
 118         * configurations, so we use the the first method there, stripping off
 119         * the extra register in the process.
 120         */
 121        if (rs5c->smbus) {
 122                int addr = RS5C_ADDR(RS5C372_REG_SECS);
 123                int size = sizeof(rs5c->buf) - 1;
 124
 125                if (i2c_smbus_read_i2c_block_data(client, addr, size,
 126                                                  rs5c->buf + 1) != size) {
 127                        dev_warn(&client->dev, "can't read registers\n");
 128                        return -EIO;
 129                }
 130        } else {
 131                if ((i2c_transfer(client->adapter, msgs, 1)) != 1) {
 132                        dev_warn(&client->dev, "can't read registers\n");
 133                        return -EIO;
 134                }
 135        }
 136
 137        dev_dbg(&client->dev,
 138                "%02x %02x %02x (%02x) %02x %02x %02x (%02x), "
 139                "%02x %02x %02x, %02x %02x %02x; %02x %02x\n",
 140                rs5c->regs[0],  rs5c->regs[1],  rs5c->regs[2],  rs5c->regs[3],
 141                rs5c->regs[4],  rs5c->regs[5],  rs5c->regs[6],  rs5c->regs[7],
 142                rs5c->regs[8],  rs5c->regs[9],  rs5c->regs[10], rs5c->regs[11],
 143                rs5c->regs[12], rs5c->regs[13], rs5c->regs[14], rs5c->regs[15]);
 144
 145        return 0;
 146}
 147
 148static unsigned rs5c_reg2hr(struct rs5c372 *rs5c, unsigned reg)
 149{
 150        unsigned        hour;
 151
 152        if (rs5c->time24)
 153                return bcd2bin(reg & 0x3f);
 154
 155        hour = bcd2bin(reg & 0x1f);
 156        if (hour == 12)
 157                hour = 0;
 158        if (reg & 0x20)
 159                hour += 12;
 160        return hour;
 161}
 162
 163static unsigned rs5c_hr2reg(struct rs5c372 *rs5c, unsigned hour)
 164{
 165        if (rs5c->time24)
 166                return bin2bcd(hour);
 167
 168        if (hour > 12)
 169                return 0x20 | bin2bcd(hour - 12);
 170        if (hour == 12)
 171                return 0x20 | bin2bcd(12);
 172        if (hour == 0)
 173                return bin2bcd(12);
 174        return bin2bcd(hour);
 175}
 176
 177static int rs5c372_get_datetime(struct i2c_client *client, struct rtc_time *tm)
 178{
 179        struct rs5c372  *rs5c = i2c_get_clientdata(client);
 180        int             status = rs5c_get_regs(rs5c);
 181
 182        if (status < 0)
 183                return status;
 184
 185        tm->tm_sec = bcd2bin(rs5c->regs[RS5C372_REG_SECS] & 0x7f);
 186        tm->tm_min = bcd2bin(rs5c->regs[RS5C372_REG_MINS] & 0x7f);
 187        tm->tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C372_REG_HOURS]);
 188
 189        tm->tm_wday = bcd2bin(rs5c->regs[RS5C372_REG_WDAY] & 0x07);
 190        tm->tm_mday = bcd2bin(rs5c->regs[RS5C372_REG_DAY] & 0x3f);
 191
 192        /* tm->tm_mon is zero-based */
 193        tm->tm_mon = bcd2bin(rs5c->regs[RS5C372_REG_MONTH] & 0x1f) - 1;
 194
 195        /* year is 1900 + tm->tm_year */
 196        tm->tm_year = bcd2bin(rs5c->regs[RS5C372_REG_YEAR]) + 100;
 197
 198        dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 199                "mday=%d, mon=%d, year=%d, wday=%d\n",
 200                __func__,
 201                tm->tm_sec, tm->tm_min, tm->tm_hour,
 202                tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
 203
 204        /* rtc might need initialization */
 205        return rtc_valid_tm(tm);
 206}
 207
 208static int rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm)
 209{
 210        struct rs5c372  *rs5c = i2c_get_clientdata(client);
 211        unsigned char   buf[7];
 212        int             addr;
 213
 214        dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d "
 215                "mday=%d, mon=%d, year=%d, wday=%d\n",
 216                __func__,
 217                tm->tm_sec, tm->tm_min, tm->tm_hour,
 218                tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
 219
 220        addr   = RS5C_ADDR(RS5C372_REG_SECS);
 221        buf[0] = bin2bcd(tm->tm_sec);
 222        buf[1] = bin2bcd(tm->tm_min);
 223        buf[2] = rs5c_hr2reg(rs5c, tm->tm_hour);
 224        buf[3] = bin2bcd(tm->tm_wday);
 225        buf[4] = bin2bcd(tm->tm_mday);
 226        buf[5] = bin2bcd(tm->tm_mon + 1);
 227        buf[6] = bin2bcd(tm->tm_year - 100);
 228
 229        if (i2c_smbus_write_i2c_block_data(client, addr, sizeof(buf), buf) < 0) {
 230                dev_err(&client->dev, "%s: write error\n", __func__);
 231                return -EIO;
 232        }
 233
 234        return 0;
 235}
 236
 237#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
 238#define NEED_TRIM
 239#endif
 240
 241#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE)
 242#define NEED_TRIM
 243#endif
 244
 245#ifdef  NEED_TRIM
 246static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim)
 247{
 248        struct rs5c372 *rs5c372 = i2c_get_clientdata(client);
 249        u8 tmp = rs5c372->regs[RS5C372_REG_TRIM];
 250
 251        if (osc)
 252                *osc = (tmp & RS5C372_TRIM_XSL) ? 32000 : 32768;
 253
 254        if (trim) {
 255                dev_dbg(&client->dev, "%s: raw trim=%x\n", __func__, tmp);
 256                tmp &= RS5C372_TRIM_MASK;
 257                if (tmp & 0x3e) {
 258                        int t = tmp & 0x3f;
 259
 260                        if (tmp & 0x40)
 261                                t = (~t | (s8)0xc0) + 1;
 262                        else
 263                                t = t - 1;
 264
 265                        tmp = t * 2;
 266                } else
 267                        tmp = 0;
 268                *trim = tmp;
 269        }
 270
 271        return 0;
 272}
 273#endif
 274
 275static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm)
 276{
 277        return rs5c372_get_datetime(to_i2c_client(dev), tm);
 278}
 279
 280static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm)
 281{
 282        return rs5c372_set_datetime(to_i2c_client(dev), tm);
 283}
 284
 285
 286static int rs5c_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
 287{
 288        struct i2c_client       *client = to_i2c_client(dev);
 289        struct rs5c372          *rs5c = i2c_get_clientdata(client);
 290        unsigned char           buf;
 291        int                     status, addr;
 292
 293        buf = rs5c->regs[RS5C_REG_CTRL1];
 294
 295        if (!rs5c->has_irq)
 296                return -EINVAL;
 297
 298        status = rs5c_get_regs(rs5c);
 299        if (status < 0)
 300                return status;
 301
 302        addr = RS5C_ADDR(RS5C_REG_CTRL1);
 303        if (enabled)
 304                buf |= RS5C_CTRL1_AALE;
 305        else
 306                buf &= ~RS5C_CTRL1_AALE;
 307
 308        if (i2c_smbus_write_byte_data(client, addr, buf) < 0) {
 309                printk(KERN_WARNING "%s: can't update alarm\n",
 310                        rs5c->rtc->name);
 311                status = -EIO;
 312        } else
 313                rs5c->regs[RS5C_REG_CTRL1] = buf;
 314
 315        return status;
 316}
 317
 318
 319/* NOTE:  Since RTC_WKALM_{RD,SET} were originally defined for EFI,
 320 * which only exposes a polled programming interface; and since
 321 * these calls map directly to those EFI requests; we don't demand
 322 * we have an IRQ for this chip when we go through this API.
 323 *
 324 * The older x86_pc derived RTC_ALM_{READ,SET} calls require irqs
 325 * though, managed through RTC_AIE_{ON,OFF} requests.
 326 */
 327
 328static int rs5c_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 329{
 330        struct i2c_client       *client = to_i2c_client(dev);
 331        struct rs5c372          *rs5c = i2c_get_clientdata(client);
 332        int                     status;
 333
 334        status = rs5c_get_regs(rs5c);
 335        if (status < 0)
 336                return status;
 337
 338        /* report alarm time */
 339        t->time.tm_sec = 0;
 340        t->time.tm_min = bcd2bin(rs5c->regs[RS5C_REG_ALARM_A_MIN] & 0x7f);
 341        t->time.tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C_REG_ALARM_A_HOURS]);
 342        t->time.tm_mday = -1;
 343        t->time.tm_mon = -1;
 344        t->time.tm_year = -1;
 345        t->time.tm_wday = -1;
 346        t->time.tm_yday = -1;
 347        t->time.tm_isdst = -1;
 348
 349        /* ... and status */
 350        t->enabled = !!(rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE);
 351        t->pending = !!(rs5c->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_AAFG);
 352
 353        return 0;
 354}
 355
 356static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 357{
 358        struct i2c_client       *client = to_i2c_client(dev);
 359        struct rs5c372          *rs5c = i2c_get_clientdata(client);
 360        int                     status, addr, i;
 361        unsigned char           buf[3];
 362
 363        /* only handle up to 24 hours in the future, like RTC_ALM_SET */
 364        if (t->time.tm_mday != -1
 365                        || t->time.tm_mon != -1
 366                        || t->time.tm_year != -1)
 367                return -EINVAL;
 368
 369        /* REVISIT: round up tm_sec */
 370
 371        /* if needed, disable irq (clears pending status) */
 372        status = rs5c_get_regs(rs5c);
 373        if (status < 0)
 374                return status;
 375        if (rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE) {
 376                addr = RS5C_ADDR(RS5C_REG_CTRL1);
 377                buf[0] = rs5c->regs[RS5C_REG_CTRL1] & ~RS5C_CTRL1_AALE;
 378                if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) {
 379                        pr_debug("%s: can't disable alarm\n", rs5c->rtc->name);
 380                        return -EIO;
 381                }
 382                rs5c->regs[RS5C_REG_CTRL1] = buf[0];
 383        }
 384
 385        /* set alarm */
 386        buf[0] = bin2bcd(t->time.tm_min);
 387        buf[1] = rs5c_hr2reg(rs5c, t->time.tm_hour);
 388        buf[2] = 0x7f;  /* any/all days */
 389
 390        for (i = 0; i < sizeof(buf); i++) {
 391                addr = RS5C_ADDR(RS5C_REG_ALARM_A_MIN + i);
 392                if (i2c_smbus_write_byte_data(client, addr, buf[i]) < 0) {
 393                        pr_debug("%s: can't set alarm time\n", rs5c->rtc->name);
 394                        return -EIO;
 395                }
 396        }
 397
 398        /* ... and maybe enable its irq */
 399        if (t->enabled) {
 400                addr = RS5C_ADDR(RS5C_REG_CTRL1);
 401                buf[0] = rs5c->regs[RS5C_REG_CTRL1] | RS5C_CTRL1_AALE;
 402                if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0)
 403                        printk(KERN_WARNING "%s: can't enable alarm\n",
 404                                rs5c->rtc->name);
 405                rs5c->regs[RS5C_REG_CTRL1] = buf[0];
 406        }
 407
 408        return 0;
 409}
 410
 411#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
 412
 413static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq)
 414{
 415        int err, osc, trim;
 416
 417        err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim);
 418        if (err == 0) {
 419                seq_printf(seq, "crystal\t\t: %d.%03d KHz\n",
 420                                osc / 1000, osc % 1000);
 421                seq_printf(seq, "trim\t\t: %d\n", trim);
 422        }
 423
 424        return 0;
 425}
 426
 427#else
 428#define rs5c372_rtc_proc        NULL
 429#endif
 430
 431static const struct rtc_class_ops rs5c372_rtc_ops = {
 432        .proc           = rs5c372_rtc_proc,
 433        .read_time      = rs5c372_rtc_read_time,
 434        .set_time       = rs5c372_rtc_set_time,
 435        .read_alarm     = rs5c_read_alarm,
 436        .set_alarm      = rs5c_set_alarm,
 437        .alarm_irq_enable = rs5c_rtc_alarm_irq_enable,
 438};
 439
 440#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE)
 441
 442static ssize_t rs5c372_sysfs_show_trim(struct device *dev,
 443                                struct device_attribute *attr, char *buf)
 444{
 445        int err, trim;
 446
 447        err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim);
 448        if (err)
 449                return err;
 450
 451        return sprintf(buf, "%d\n", trim);
 452}
 453static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL);
 454
 455static ssize_t rs5c372_sysfs_show_osc(struct device *dev,
 456                                struct device_attribute *attr, char *buf)
 457{
 458        int err, osc;
 459
 460        err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL);
 461        if (err)
 462                return err;
 463
 464        return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000);
 465}
 466static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL);
 467
 468static int rs5c_sysfs_register(struct device *dev)
 469{
 470        int err;
 471
 472        err = device_create_file(dev, &dev_attr_trim);
 473        if (err)
 474                return err;
 475        err = device_create_file(dev, &dev_attr_osc);
 476        if (err)
 477                device_remove_file(dev, &dev_attr_trim);
 478
 479        return err;
 480}
 481
 482static void rs5c_sysfs_unregister(struct device *dev)
 483{
 484        device_remove_file(dev, &dev_attr_trim);
 485        device_remove_file(dev, &dev_attr_osc);
 486}
 487
 488#else
 489static int rs5c_sysfs_register(struct device *dev)
 490{
 491        return 0;
 492}
 493
 494static void rs5c_sysfs_unregister(struct device *dev)
 495{
 496        /* nothing */
 497}
 498#endif  /* SYSFS */
 499
 500static struct i2c_driver rs5c372_driver;
 501
 502static int rs5c_oscillator_setup(struct rs5c372 *rs5c372)
 503{
 504        unsigned char buf[2];
 505        int addr, i, ret = 0;
 506
 507        if (rs5c372->type == rtc_r2025sd) {
 508                if (!(rs5c372->regs[RS5C_REG_CTRL2] & R2025_CTRL2_XST))
 509                        return ret;
 510                rs5c372->regs[RS5C_REG_CTRL2] &= ~R2025_CTRL2_XST;
 511        } else {
 512                if (!(rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP))
 513                        return ret;
 514                rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP;
 515        }
 516
 517        addr   = RS5C_ADDR(RS5C_REG_CTRL1);
 518        buf[0] = rs5c372->regs[RS5C_REG_CTRL1];
 519        buf[1] = rs5c372->regs[RS5C_REG_CTRL2];
 520
 521        /* use 24hr mode */
 522        switch (rs5c372->type) {
 523        case rtc_rs5c372a:
 524        case rtc_rs5c372b:
 525                buf[1] |= RS5C372_CTRL2_24;
 526                rs5c372->time24 = 1;
 527                break;
 528        case rtc_r2025sd:
 529        case rtc_rv5c386:
 530        case rtc_rv5c387a:
 531                buf[0] |= RV5C387_CTRL1_24;
 532                rs5c372->time24 = 1;
 533                break;
 534        default:
 535                /* impossible */
 536                break;
 537        }
 538
 539        for (i = 0; i < sizeof(buf); i++) {
 540                addr = RS5C_ADDR(RS5C_REG_CTRL1 + i);
 541                ret = i2c_smbus_write_byte_data(rs5c372->client, addr, buf[i]);
 542                if (unlikely(ret < 0))
 543                        return ret;
 544        }
 545
 546        rs5c372->regs[RS5C_REG_CTRL1] = buf[0];
 547        rs5c372->regs[RS5C_REG_CTRL2] = buf[1];
 548
 549        return 0;
 550}
 551
 552static int rs5c372_probe(struct i2c_client *client,
 553                         const struct i2c_device_id *id)
 554{
 555        int err = 0;
 556        int smbus_mode = 0;
 557        struct rs5c372 *rs5c372;
 558        struct rtc_time tm;
 559
 560        dev_dbg(&client->dev, "%s\n", __func__);
 561
 562        if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
 563                        I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) {
 564                /*
 565                 * If we don't have any master mode adapter, try breaking
 566                 * it down in to the barest of capabilities.
 567                 */
 568                if (i2c_check_functionality(client->adapter,
 569                                I2C_FUNC_SMBUS_BYTE_DATA |
 570                                I2C_FUNC_SMBUS_I2C_BLOCK))
 571                        smbus_mode = 1;
 572                else {
 573                        /* Still no good, give up */
 574                        err = -ENODEV;
 575                        goto exit;
 576                }
 577        }
 578
 579        if (!(rs5c372 = kzalloc(sizeof(struct rs5c372), GFP_KERNEL))) {
 580                err = -ENOMEM;
 581                goto exit;
 582        }
 583
 584        rs5c372->client = client;
 585        i2c_set_clientdata(client, rs5c372);
 586        rs5c372->type = id->driver_data;
 587
 588        /* we read registers 0x0f then 0x00-0x0f; skip the first one */
 589        rs5c372->regs = &rs5c372->buf[1];
 590        rs5c372->smbus = smbus_mode;
 591
 592        err = rs5c_get_regs(rs5c372);
 593        if (err < 0)
 594                goto exit_kfree;
 595
 596        /* clock may be set for am/pm or 24 hr time */
 597        switch (rs5c372->type) {
 598        case rtc_rs5c372a:
 599        case rtc_rs5c372b:
 600                /* alarm uses ALARM_A; and nINTRA on 372a, nINTR on 372b.
 601                 * so does periodic irq, except some 327a modes.
 602                 */
 603                if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24)
 604                        rs5c372->time24 = 1;
 605                break;
 606        case rtc_r2025sd:
 607        case rtc_rv5c386:
 608        case rtc_rv5c387a:
 609                if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24)
 610                        rs5c372->time24 = 1;
 611                /* alarm uses ALARM_W; and nINTRB for alarm and periodic
 612                 * irq, on both 386 and 387
 613                 */
 614                break;
 615        default:
 616                dev_err(&client->dev, "unknown RTC type\n");
 617                goto exit_kfree;
 618        }
 619
 620        /* if the oscillator lost power and no other software (like
 621         * the bootloader) set it up, do it here.
 622         *
 623         * The R2025S/D does this a little differently than the other
 624         * parts, so we special case that..
 625         */
 626        err = rs5c_oscillator_setup(rs5c372);
 627        if (unlikely(err < 0)) {
 628                dev_err(&client->dev, "setup error\n");
 629                goto exit_kfree;
 630        }
 631
 632        if (rs5c372_get_datetime(client, &tm) < 0)
 633                dev_warn(&client->dev, "clock needs to be set\n");
 634
 635        dev_info(&client->dev, "%s found, %s, driver version " DRV_VERSION "\n",
 636                        ({ char *s; switch (rs5c372->type) {
 637                        case rtc_r2025sd:       s = "r2025sd"; break;
 638                        case rtc_rs5c372a:      s = "rs5c372a"; break;
 639                        case rtc_rs5c372b:      s = "rs5c372b"; break;
 640                        case rtc_rv5c386:       s = "rv5c386"; break;
 641                        case rtc_rv5c387a:      s = "rv5c387a"; break;
 642                        default:                s = "chip"; break;
 643                        }; s;}),
 644                        rs5c372->time24 ? "24hr" : "am/pm"
 645                        );
 646
 647        /* REVISIT use client->irq to register alarm irq ... */
 648
 649        rs5c372->rtc = rtc_device_register(rs5c372_driver.driver.name,
 650                                &client->dev, &rs5c372_rtc_ops, THIS_MODULE);
 651
 652        if (IS_ERR(rs5c372->rtc)) {
 653                err = PTR_ERR(rs5c372->rtc);
 654                goto exit_kfree;
 655        }
 656
 657        err = rs5c_sysfs_register(&client->dev);
 658        if (err)
 659                goto exit_devreg;
 660
 661        return 0;
 662
 663exit_devreg:
 664        rtc_device_unregister(rs5c372->rtc);
 665
 666exit_kfree:
 667        kfree(rs5c372);
 668
 669exit:
 670        return err;
 671}
 672
 673static int rs5c372_remove(struct i2c_client *client)
 674{
 675        struct rs5c372 *rs5c372 = i2c_get_clientdata(client);
 676
 677        rtc_device_unregister(rs5c372->rtc);
 678        rs5c_sysfs_unregister(&client->dev);
 679        kfree(rs5c372);
 680        return 0;
 681}
 682
 683static struct i2c_driver rs5c372_driver = {
 684        .driver         = {
 685                .name   = "rtc-rs5c372",
 686        },
 687        .probe          = rs5c372_probe,
 688        .remove         = rs5c372_remove,
 689        .id_table       = rs5c372_id,
 690};
 691
 692module_i2c_driver(rs5c372_driver);
 693
 694MODULE_AUTHOR(
 695                "Pavel Mironchik <pmironchik@optifacio.net>, "
 696                "Alessandro Zummo <a.zummo@towertech.it>, "
 697                "Paul Mundt <lethal@linux-sh.org>");
 698MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver");
 699MODULE_LICENSE("GPL");
 700MODULE_VERSION(DRV_VERSION);
 701
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