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286 lines
7.2 KiB
286 lines
7.2 KiB
// 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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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