287 lines
7.2 KiB
C
287 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* NXP PCF50633 RTC Driver
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*
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* (C) 2006-2008 by Openmoko, Inc.
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* Author: Balaji Rao <balajirrao@openmoko.org>
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* All rights reserved.
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*
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* Broken down from monstrous PCF50633 driver mainly by
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* Harald Welte, Andy Green and Werner Almesberger
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#include <linux/err.h>
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#include <linux/mfd/pcf50633/core.h>
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#define PCF50633_REG_RTCSC 0x59 /* Second */
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#define PCF50633_REG_RTCMN 0x5a /* Minute */
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#define PCF50633_REG_RTCHR 0x5b /* Hour */
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#define PCF50633_REG_RTCWD 0x5c /* Weekday */
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#define PCF50633_REG_RTCDT 0x5d /* Day */
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#define PCF50633_REG_RTCMT 0x5e /* Month */
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#define PCF50633_REG_RTCYR 0x5f /* Year */
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#define PCF50633_REG_RTCSCA 0x60 /* Alarm Second */
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#define PCF50633_REG_RTCMNA 0x61 /* Alarm Minute */
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#define PCF50633_REG_RTCHRA 0x62 /* Alarm Hour */
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#define PCF50633_REG_RTCWDA 0x63 /* Alarm Weekday */
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#define PCF50633_REG_RTCDTA 0x64 /* Alarm Day */
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#define PCF50633_REG_RTCMTA 0x65 /* Alarm Month */
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#define PCF50633_REG_RTCYRA 0x66 /* Alarm Year */
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enum pcf50633_time_indexes {
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PCF50633_TI_SEC,
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PCF50633_TI_MIN,
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PCF50633_TI_HOUR,
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PCF50633_TI_WKDAY,
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PCF50633_TI_DAY,
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PCF50633_TI_MONTH,
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PCF50633_TI_YEAR,
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PCF50633_TI_EXTENT /* always last */
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};
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struct pcf50633_time {
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u_int8_t time[PCF50633_TI_EXTENT];
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};
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struct pcf50633_rtc {
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int alarm_enabled;
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int alarm_pending;
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struct pcf50633 *pcf;
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struct rtc_device *rtc_dev;
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};
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static void pcf2rtc_time(struct rtc_time *rtc, struct pcf50633_time *pcf)
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{
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rtc->tm_sec = bcd2bin(pcf->time[PCF50633_TI_SEC]);
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rtc->tm_min = bcd2bin(pcf->time[PCF50633_TI_MIN]);
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rtc->tm_hour = bcd2bin(pcf->time[PCF50633_TI_HOUR]);
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rtc->tm_wday = bcd2bin(pcf->time[PCF50633_TI_WKDAY]);
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rtc->tm_mday = bcd2bin(pcf->time[PCF50633_TI_DAY]);
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rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]) - 1;
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rtc->tm_year = bcd2bin(pcf->time[PCF50633_TI_YEAR]) + 100;
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}
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static void rtc2pcf_time(struct pcf50633_time *pcf, struct rtc_time *rtc)
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{
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pcf->time[PCF50633_TI_SEC] = bin2bcd(rtc->tm_sec);
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pcf->time[PCF50633_TI_MIN] = bin2bcd(rtc->tm_min);
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pcf->time[PCF50633_TI_HOUR] = bin2bcd(rtc->tm_hour);
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pcf->time[PCF50633_TI_WKDAY] = bin2bcd(rtc->tm_wday);
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pcf->time[PCF50633_TI_DAY] = bin2bcd(rtc->tm_mday);
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pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon + 1);
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pcf->time[PCF50633_TI_YEAR] = bin2bcd(rtc->tm_year % 100);
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}
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static int
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pcf50633_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct pcf50633_rtc *rtc = dev_get_drvdata(dev);
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int err;
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if (enabled)
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err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
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else
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err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
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if (err < 0)
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return err;
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rtc->alarm_enabled = enabled;
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return 0;
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}
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static int pcf50633_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct pcf50633_rtc *rtc;
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struct pcf50633_time pcf_tm;
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int ret;
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rtc = dev_get_drvdata(dev);
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ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSC,
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PCF50633_TI_EXTENT,
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&pcf_tm.time[0]);
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if (ret != PCF50633_TI_EXTENT) {
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dev_err(dev, "Failed to read time\n");
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return -EIO;
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}
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dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
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pcf_tm.time[PCF50633_TI_DAY],
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pcf_tm.time[PCF50633_TI_MONTH],
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pcf_tm.time[PCF50633_TI_YEAR],
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pcf_tm.time[PCF50633_TI_HOUR],
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pcf_tm.time[PCF50633_TI_MIN],
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pcf_tm.time[PCF50633_TI_SEC]);
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pcf2rtc_time(tm, &pcf_tm);
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dev_dbg(dev, "RTC_TIME: %ptRr\n", tm);
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return 0;
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}
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static int pcf50633_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct pcf50633_rtc *rtc;
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struct pcf50633_time pcf_tm;
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int alarm_masked, ret = 0;
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rtc = dev_get_drvdata(dev);
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dev_dbg(dev, "RTC_TIME: %ptRr\n", tm);
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rtc2pcf_time(&pcf_tm, tm);
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dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
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pcf_tm.time[PCF50633_TI_DAY],
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pcf_tm.time[PCF50633_TI_MONTH],
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pcf_tm.time[PCF50633_TI_YEAR],
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pcf_tm.time[PCF50633_TI_HOUR],
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pcf_tm.time[PCF50633_TI_MIN],
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pcf_tm.time[PCF50633_TI_SEC]);
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alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
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if (!alarm_masked)
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pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
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/* Returns 0 on success */
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ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSC,
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PCF50633_TI_EXTENT,
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&pcf_tm.time[0]);
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if (!alarm_masked)
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pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
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return ret;
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}
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static int pcf50633_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct pcf50633_rtc *rtc;
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struct pcf50633_time pcf_tm;
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int ret = 0;
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rtc = dev_get_drvdata(dev);
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alrm->enabled = rtc->alarm_enabled;
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alrm->pending = rtc->alarm_pending;
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ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSCA,
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PCF50633_TI_EXTENT, &pcf_tm.time[0]);
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if (ret != PCF50633_TI_EXTENT) {
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dev_err(dev, "Failed to read time\n");
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return -EIO;
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}
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pcf2rtc_time(&alrm->time, &pcf_tm);
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return rtc_valid_tm(&alrm->time);
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}
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static int pcf50633_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct pcf50633_rtc *rtc;
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struct pcf50633_time pcf_tm;
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int alarm_masked, ret = 0;
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rtc = dev_get_drvdata(dev);
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rtc2pcf_time(&pcf_tm, &alrm->time);
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/* do like mktime does and ignore tm_wday */
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pcf_tm.time[PCF50633_TI_WKDAY] = 7;
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alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
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/* disable alarm interrupt */
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if (!alarm_masked)
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pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
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/* Returns 0 on success */
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ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSCA,
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PCF50633_TI_EXTENT, &pcf_tm.time[0]);
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if (!alrm->enabled)
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rtc->alarm_pending = 0;
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if (!alarm_masked || alrm->enabled)
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pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
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rtc->alarm_enabled = alrm->enabled;
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return ret;
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}
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static const struct rtc_class_ops pcf50633_rtc_ops = {
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.read_time = pcf50633_rtc_read_time,
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.set_time = pcf50633_rtc_set_time,
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.read_alarm = pcf50633_rtc_read_alarm,
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.set_alarm = pcf50633_rtc_set_alarm,
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.alarm_irq_enable = pcf50633_rtc_alarm_irq_enable,
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};
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static void pcf50633_rtc_irq(int irq, void *data)
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{
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struct pcf50633_rtc *rtc = data;
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rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
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rtc->alarm_pending = 1;
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}
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static int pcf50633_rtc_probe(struct platform_device *pdev)
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{
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struct pcf50633_rtc *rtc;
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rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
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if (!rtc)
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return -ENOMEM;
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rtc->pcf = dev_to_pcf50633(pdev->dev.parent);
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platform_set_drvdata(pdev, rtc);
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rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "pcf50633-rtc",
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&pcf50633_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc->rtc_dev))
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return PTR_ERR(rtc->rtc_dev);
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pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_ALARM,
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pcf50633_rtc_irq, rtc);
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return 0;
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}
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static int pcf50633_rtc_remove(struct platform_device *pdev)
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{
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struct pcf50633_rtc *rtc;
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rtc = platform_get_drvdata(pdev);
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pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_ALARM);
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return 0;
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}
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static struct platform_driver pcf50633_rtc_driver = {
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.driver = {
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.name = "pcf50633-rtc",
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},
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.probe = pcf50633_rtc_probe,
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.remove = pcf50633_rtc_remove,
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};
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module_platform_driver(pcf50633_rtc_driver);
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MODULE_DESCRIPTION("PCF50633 RTC driver");
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MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
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MODULE_LICENSE("GPL");
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