linux/drivers/rtc/rtc-pcf50633.c
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   1/* NXP PCF50633 RTC Driver
   2 *
   3 * (C) 2006-2008 by Openmoko, Inc.
   4 * Author: Balaji Rao <balajirrao@openmoko.org>
   5 * All rights reserved.
   6 *
   7 * Broken down from monstrous PCF50633 driver mainly by
   8 * Harald Welte, Andy Green and Werner Almesberger
   9 *
  10 *  This program is free software; you can redistribute  it and/or modify it
  11 *  under  the terms of  the GNU General  Public License as published by the
  12 *  Free Software Foundation;  either version 2 of the  License, or (at your
  13 *  option) any later version.
  14 *
  15 */
  16
  17#include <linux/kernel.h>
  18#include <linux/module.h>
  19#include <linux/init.h>
  20#include <linux/device.h>
  21#include <linux/slab.h>
  22#include <linux/platform_device.h>
  23#include <linux/rtc.h>
  24#include <linux/bcd.h>
  25#include <linux/err.h>
  26
  27#include <linux/mfd/pcf50633/core.h>
  28
  29#define PCF50633_REG_RTCSC      0x59 /* Second */
  30#define PCF50633_REG_RTCMN      0x5a /* Minute */
  31#define PCF50633_REG_RTCHR      0x5b /* Hour */
  32#define PCF50633_REG_RTCWD      0x5c /* Weekday */
  33#define PCF50633_REG_RTCDT      0x5d /* Day */
  34#define PCF50633_REG_RTCMT      0x5e /* Month */
  35#define PCF50633_REG_RTCYR      0x5f /* Year */
  36#define PCF50633_REG_RTCSCA     0x60 /* Alarm Second */
  37#define PCF50633_REG_RTCMNA     0x61 /* Alarm Minute */
  38#define PCF50633_REG_RTCHRA     0x62 /* Alarm Hour */
  39#define PCF50633_REG_RTCWDA     0x63 /* Alarm Weekday */
  40#define PCF50633_REG_RTCDTA     0x64 /* Alarm Day */
  41#define PCF50633_REG_RTCMTA     0x65 /* Alarm Month */
  42#define PCF50633_REG_RTCYRA     0x66 /* Alarm Year */
  43
  44enum pcf50633_time_indexes {
  45        PCF50633_TI_SEC,
  46        PCF50633_TI_MIN,
  47        PCF50633_TI_HOUR,
  48        PCF50633_TI_WKDAY,
  49        PCF50633_TI_DAY,
  50        PCF50633_TI_MONTH,
  51        PCF50633_TI_YEAR,
  52        PCF50633_TI_EXTENT /* always last */
  53};
  54
  55struct pcf50633_time {
  56        u_int8_t time[PCF50633_TI_EXTENT];
  57};
  58
  59struct pcf50633_rtc {
  60        int alarm_enabled;
  61        int alarm_pending;
  62
  63        struct pcf50633 *pcf;
  64        struct rtc_device *rtc_dev;
  65};
  66
  67static void pcf2rtc_time(struct rtc_time *rtc, struct pcf50633_time *pcf)
  68{
  69        rtc->tm_sec = bcd2bin(pcf->time[PCF50633_TI_SEC]);
  70        rtc->tm_min = bcd2bin(pcf->time[PCF50633_TI_MIN]);
  71        rtc->tm_hour = bcd2bin(pcf->time[PCF50633_TI_HOUR]);
  72        rtc->tm_wday = bcd2bin(pcf->time[PCF50633_TI_WKDAY]);
  73        rtc->tm_mday = bcd2bin(pcf->time[PCF50633_TI_DAY]);
  74        rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]) - 1;
  75        rtc->tm_year = bcd2bin(pcf->time[PCF50633_TI_YEAR]) + 100;
  76}
  77
  78static void rtc2pcf_time(struct pcf50633_time *pcf, struct rtc_time *rtc)
  79{
  80        pcf->time[PCF50633_TI_SEC] = bin2bcd(rtc->tm_sec);
  81        pcf->time[PCF50633_TI_MIN] = bin2bcd(rtc->tm_min);
  82        pcf->time[PCF50633_TI_HOUR] = bin2bcd(rtc->tm_hour);
  83        pcf->time[PCF50633_TI_WKDAY] = bin2bcd(rtc->tm_wday);
  84        pcf->time[PCF50633_TI_DAY] = bin2bcd(rtc->tm_mday);
  85        pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon + 1);
  86        pcf->time[PCF50633_TI_YEAR] = bin2bcd(rtc->tm_year % 100);
  87}
  88
  89static int
  90pcf50633_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
  91{
  92        struct pcf50633_rtc *rtc = dev_get_drvdata(dev);
  93        int err;
  94
  95        if (enabled)
  96                err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
  97        else
  98                err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
  99
 100        if (err < 0)
 101                return err;
 102
 103        rtc->alarm_enabled = enabled;
 104
 105        return 0;
 106}
 107
 108static int pcf50633_rtc_read_time(struct device *dev, struct rtc_time *tm)
 109{
 110        struct pcf50633_rtc *rtc;
 111        struct pcf50633_time pcf_tm;
 112        int ret;
 113
 114        rtc = dev_get_drvdata(dev);
 115
 116        ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSC,
 117                                            PCF50633_TI_EXTENT,
 118                                            &pcf_tm.time[0]);
 119        if (ret != PCF50633_TI_EXTENT) {
 120                dev_err(dev, "Failed to read time\n");
 121                return -EIO;
 122        }
 123
 124        dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
 125                pcf_tm.time[PCF50633_TI_DAY],
 126                pcf_tm.time[PCF50633_TI_MONTH],
 127                pcf_tm.time[PCF50633_TI_YEAR],
 128                pcf_tm.time[PCF50633_TI_HOUR],
 129                pcf_tm.time[PCF50633_TI_MIN],
 130                pcf_tm.time[PCF50633_TI_SEC]);
 131
 132        pcf2rtc_time(tm, &pcf_tm);
 133
 134        dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n",
 135                tm->tm_mday, tm->tm_mon, tm->tm_year,
 136                tm->tm_hour, tm->tm_min, tm->tm_sec);
 137
 138        return rtc_valid_tm(tm);
 139}
 140
 141static int pcf50633_rtc_set_time(struct device *dev, struct rtc_time *tm)
 142{
 143        struct pcf50633_rtc *rtc;
 144        struct pcf50633_time pcf_tm;
 145        int alarm_masked, ret = 0;
 146
 147        rtc = dev_get_drvdata(dev);
 148
 149        dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n",
 150                tm->tm_mday, tm->tm_mon, tm->tm_year,
 151                tm->tm_hour, tm->tm_min, tm->tm_sec);
 152
 153        rtc2pcf_time(&pcf_tm, tm);
 154
 155        dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
 156                pcf_tm.time[PCF50633_TI_DAY],
 157                pcf_tm.time[PCF50633_TI_MONTH],
 158                pcf_tm.time[PCF50633_TI_YEAR],
 159                pcf_tm.time[PCF50633_TI_HOUR],
 160                pcf_tm.time[PCF50633_TI_MIN],
 161                pcf_tm.time[PCF50633_TI_SEC]);
 162
 163
 164        alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
 165
 166        if (!alarm_masked)
 167                pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
 168
 169        /* Returns 0 on success */
 170        ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSC,
 171                                             PCF50633_TI_EXTENT,
 172                                             &pcf_tm.time[0]);
 173
 174        if (!alarm_masked)
 175                pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
 176
 177        return ret;
 178}
 179
 180static int pcf50633_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 181{
 182        struct pcf50633_rtc *rtc;
 183        struct pcf50633_time pcf_tm;
 184        int ret = 0;
 185
 186        rtc = dev_get_drvdata(dev);
 187
 188        alrm->enabled = rtc->alarm_enabled;
 189        alrm->pending = rtc->alarm_pending;
 190
 191        ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSCA,
 192                                PCF50633_TI_EXTENT, &pcf_tm.time[0]);
 193        if (ret != PCF50633_TI_EXTENT) {
 194                dev_err(dev, "Failed to read time\n");
 195                return -EIO;
 196        }
 197
 198        pcf2rtc_time(&alrm->time, &pcf_tm);
 199
 200        return rtc_valid_tm(&alrm->time);
 201}
 202
 203static int pcf50633_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 204{
 205        struct pcf50633_rtc *rtc;
 206        struct pcf50633_time pcf_tm;
 207        int alarm_masked, ret = 0;
 208
 209        rtc = dev_get_drvdata(dev);
 210
 211        rtc2pcf_time(&pcf_tm, &alrm->time);
 212
 213        /* do like mktime does and ignore tm_wday */
 214        pcf_tm.time[PCF50633_TI_WKDAY] = 7;
 215
 216        alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
 217
 218        /* disable alarm interrupt */
 219        if (!alarm_masked)
 220                pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
 221
 222        /* Returns 0 on success */
 223        ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSCA,
 224                                PCF50633_TI_EXTENT, &pcf_tm.time[0]);
 225        if (!alrm->enabled)
 226                rtc->alarm_pending = 0;
 227
 228        if (!alarm_masked || alrm->enabled)
 229                pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
 230        rtc->alarm_enabled = alrm->enabled;
 231
 232        return ret;
 233}
 234
 235static struct rtc_class_ops pcf50633_rtc_ops = {
 236        .read_time              = pcf50633_rtc_read_time,
 237        .set_time               = pcf50633_rtc_set_time,
 238        .read_alarm             = pcf50633_rtc_read_alarm,
 239        .set_alarm              = pcf50633_rtc_set_alarm,
 240        .alarm_irq_enable       = pcf50633_rtc_alarm_irq_enable,
 241};
 242
 243static void pcf50633_rtc_irq(int irq, void *data)
 244{
 245        struct pcf50633_rtc *rtc = data;
 246
 247        rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
 248        rtc->alarm_pending = 1;
 249}
 250
 251static int pcf50633_rtc_probe(struct platform_device *pdev)
 252{
 253        struct pcf50633_rtc *rtc;
 254
 255        rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
 256        if (!rtc)
 257                return -ENOMEM;
 258
 259        rtc->pcf = dev_to_pcf50633(pdev->dev.parent);
 260        platform_set_drvdata(pdev, rtc);
 261        rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "pcf50633-rtc",
 262                                &pcf50633_rtc_ops, THIS_MODULE);
 263
 264        if (IS_ERR(rtc->rtc_dev))
 265                return PTR_ERR(rtc->rtc_dev);
 266
 267        pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_ALARM,
 268                                        pcf50633_rtc_irq, rtc);
 269        return 0;
 270}
 271
 272static int pcf50633_rtc_remove(struct platform_device *pdev)
 273{
 274        struct pcf50633_rtc *rtc;
 275
 276        rtc = platform_get_drvdata(pdev);
 277        pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_ALARM);
 278
 279        return 0;
 280}
 281
 282static struct platform_driver pcf50633_rtc_driver = {
 283        .driver = {
 284                .name = "pcf50633-rtc",
 285        },
 286        .probe = pcf50633_rtc_probe,
 287        .remove = pcf50633_rtc_remove,
 288};
 289
 290module_platform_driver(pcf50633_rtc_driver);
 291
 292MODULE_DESCRIPTION("PCF50633 RTC driver");
 293MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 294MODULE_LICENSE("GPL");
 295
 296
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