521 строка
15 KiB
C
521 строка
15 KiB
C
/* rtc-da9063.c - Real time clock device driver for DA9063
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* Copyright (C) 2013-2015 Dialog Semiconductor Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/rtc.h>
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#include <linux/slab.h>
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#include <linux/mfd/da9062/registers.h>
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#include <linux/mfd/da9063/registers.h>
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#include <linux/mfd/da9063/core.h>
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#define YEARS_TO_DA9063(year) ((year) - 100)
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#define MONTHS_TO_DA9063(month) ((month) + 1)
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#define YEARS_FROM_DA9063(year) ((year) + 100)
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#define MONTHS_FROM_DA9063(month) ((month) - 1)
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enum {
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RTC_SEC = 0,
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RTC_MIN = 1,
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RTC_HOUR = 2,
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RTC_DAY = 3,
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RTC_MONTH = 4,
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RTC_YEAR = 5,
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RTC_DATA_LEN
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};
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struct da9063_compatible_rtc_regmap {
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/* REGS */
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int rtc_enable_reg;
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int rtc_enable_32k_crystal_reg;
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int rtc_alarm_secs_reg;
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int rtc_alarm_year_reg;
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int rtc_count_secs_reg;
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int rtc_count_year_reg;
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int rtc_event_reg;
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/* MASKS */
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int rtc_enable_mask;
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int rtc_crystal_mask;
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int rtc_event_alarm_mask;
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int rtc_alarm_on_mask;
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int rtc_alarm_status_mask;
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int rtc_tick_on_mask;
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int rtc_ready_to_read_mask;
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int rtc_count_sec_mask;
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int rtc_count_min_mask;
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int rtc_count_hour_mask;
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int rtc_count_day_mask;
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int rtc_count_month_mask;
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int rtc_count_year_mask;
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/* ALARM CONFIG */
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int rtc_data_start;
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int rtc_alarm_len;
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};
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struct da9063_compatible_rtc {
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struct rtc_device *rtc_dev;
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struct rtc_time alarm_time;
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struct regmap *regmap;
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const struct da9063_compatible_rtc_regmap *config;
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bool rtc_sync;
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};
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static const struct da9063_compatible_rtc_regmap da9063_ad_regs = {
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/* REGS */
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.rtc_enable_reg = DA9063_REG_CONTROL_E,
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.rtc_alarm_secs_reg = DA9063_AD_REG_ALARM_MI,
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.rtc_alarm_year_reg = DA9063_AD_REG_ALARM_Y,
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.rtc_count_secs_reg = DA9063_REG_COUNT_S,
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.rtc_count_year_reg = DA9063_REG_COUNT_Y,
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.rtc_event_reg = DA9063_REG_EVENT_A,
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/* MASKS */
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.rtc_enable_mask = DA9063_RTC_EN,
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.rtc_crystal_mask = DA9063_CRYSTAL,
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.rtc_enable_32k_crystal_reg = DA9063_REG_EN_32K,
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.rtc_event_alarm_mask = DA9063_E_ALARM,
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.rtc_alarm_on_mask = DA9063_ALARM_ON,
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.rtc_alarm_status_mask = DA9063_ALARM_STATUS_ALARM |
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DA9063_ALARM_STATUS_TICK,
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.rtc_tick_on_mask = DA9063_TICK_ON,
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.rtc_ready_to_read_mask = DA9063_RTC_READ,
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.rtc_count_sec_mask = DA9063_COUNT_SEC_MASK,
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.rtc_count_min_mask = DA9063_COUNT_MIN_MASK,
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.rtc_count_hour_mask = DA9063_COUNT_HOUR_MASK,
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.rtc_count_day_mask = DA9063_COUNT_DAY_MASK,
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.rtc_count_month_mask = DA9063_COUNT_MONTH_MASK,
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.rtc_count_year_mask = DA9063_COUNT_YEAR_MASK,
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/* ALARM CONFIG */
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.rtc_data_start = RTC_MIN,
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.rtc_alarm_len = RTC_DATA_LEN - 1,
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};
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static const struct da9063_compatible_rtc_regmap da9063_bb_regs = {
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/* REGS */
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.rtc_enable_reg = DA9063_REG_CONTROL_E,
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.rtc_alarm_secs_reg = DA9063_BB_REG_ALARM_S,
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.rtc_alarm_year_reg = DA9063_BB_REG_ALARM_Y,
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.rtc_count_secs_reg = DA9063_REG_COUNT_S,
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.rtc_count_year_reg = DA9063_REG_COUNT_Y,
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.rtc_event_reg = DA9063_REG_EVENT_A,
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/* MASKS */
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.rtc_enable_mask = DA9063_RTC_EN,
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.rtc_crystal_mask = DA9063_CRYSTAL,
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.rtc_enable_32k_crystal_reg = DA9063_REG_EN_32K,
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.rtc_event_alarm_mask = DA9063_E_ALARM,
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.rtc_alarm_on_mask = DA9063_ALARM_ON,
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.rtc_alarm_status_mask = DA9063_ALARM_STATUS_ALARM |
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DA9063_ALARM_STATUS_TICK,
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.rtc_tick_on_mask = DA9063_TICK_ON,
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.rtc_ready_to_read_mask = DA9063_RTC_READ,
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.rtc_count_sec_mask = DA9063_COUNT_SEC_MASK,
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.rtc_count_min_mask = DA9063_COUNT_MIN_MASK,
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.rtc_count_hour_mask = DA9063_COUNT_HOUR_MASK,
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.rtc_count_day_mask = DA9063_COUNT_DAY_MASK,
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.rtc_count_month_mask = DA9063_COUNT_MONTH_MASK,
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.rtc_count_year_mask = DA9063_COUNT_YEAR_MASK,
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/* ALARM CONFIG */
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.rtc_data_start = RTC_SEC,
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.rtc_alarm_len = RTC_DATA_LEN,
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};
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static const struct da9063_compatible_rtc_regmap da9062_aa_regs = {
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/* REGS */
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.rtc_enable_reg = DA9062AA_CONTROL_E,
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.rtc_alarm_secs_reg = DA9062AA_ALARM_S,
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.rtc_alarm_year_reg = DA9062AA_ALARM_Y,
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.rtc_count_secs_reg = DA9062AA_COUNT_S,
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.rtc_count_year_reg = DA9062AA_COUNT_Y,
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.rtc_event_reg = DA9062AA_EVENT_A,
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/* MASKS */
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.rtc_enable_mask = DA9062AA_RTC_EN_MASK,
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.rtc_crystal_mask = DA9062AA_CRYSTAL_MASK,
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.rtc_enable_32k_crystal_reg = DA9062AA_EN_32K,
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.rtc_event_alarm_mask = DA9062AA_M_ALARM_MASK,
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.rtc_alarm_on_mask = DA9062AA_ALARM_ON_MASK,
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.rtc_alarm_status_mask = (0x02 << 6),
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.rtc_tick_on_mask = DA9062AA_TICK_ON_MASK,
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.rtc_ready_to_read_mask = DA9062AA_RTC_READ_MASK,
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.rtc_count_sec_mask = DA9062AA_COUNT_SEC_MASK,
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.rtc_count_min_mask = DA9062AA_COUNT_MIN_MASK,
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.rtc_count_hour_mask = DA9062AA_COUNT_HOUR_MASK,
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.rtc_count_day_mask = DA9062AA_COUNT_DAY_MASK,
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.rtc_count_month_mask = DA9062AA_COUNT_MONTH_MASK,
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.rtc_count_year_mask = DA9062AA_COUNT_YEAR_MASK,
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/* ALARM CONFIG */
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.rtc_data_start = RTC_SEC,
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.rtc_alarm_len = RTC_DATA_LEN,
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};
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static const struct of_device_id da9063_compatible_reg_id_table[] = {
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{ .compatible = "dlg,da9063-rtc", .data = &da9063_bb_regs },
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{ .compatible = "dlg,da9062-rtc", .data = &da9062_aa_regs },
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{ },
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};
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MODULE_DEVICE_TABLE(of, da9063_compatible_reg_id_table);
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static void da9063_data_to_tm(u8 *data, struct rtc_time *tm,
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struct da9063_compatible_rtc *rtc)
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{
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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tm->tm_sec = data[RTC_SEC] & config->rtc_count_sec_mask;
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tm->tm_min = data[RTC_MIN] & config->rtc_count_min_mask;
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tm->tm_hour = data[RTC_HOUR] & config->rtc_count_hour_mask;
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tm->tm_mday = data[RTC_DAY] & config->rtc_count_day_mask;
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tm->tm_mon = MONTHS_FROM_DA9063(data[RTC_MONTH] &
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config->rtc_count_month_mask);
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tm->tm_year = YEARS_FROM_DA9063(data[RTC_YEAR] &
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config->rtc_count_year_mask);
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}
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static void da9063_tm_to_data(struct rtc_time *tm, u8 *data,
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struct da9063_compatible_rtc *rtc)
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{
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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data[RTC_SEC] &= ~config->rtc_count_sec_mask;
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data[RTC_SEC] |= tm->tm_sec & config->rtc_count_sec_mask;
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data[RTC_MIN] &= ~config->rtc_count_min_mask;
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data[RTC_MIN] |= tm->tm_min & config->rtc_count_min_mask;
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data[RTC_HOUR] &= ~config->rtc_count_hour_mask;
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data[RTC_HOUR] |= tm->tm_hour & config->rtc_count_hour_mask;
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data[RTC_DAY] &= ~config->rtc_count_day_mask;
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data[RTC_DAY] |= tm->tm_mday & config->rtc_count_day_mask;
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data[RTC_MONTH] &= ~config->rtc_count_month_mask;
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data[RTC_MONTH] |= MONTHS_TO_DA9063(tm->tm_mon) &
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config->rtc_count_month_mask;
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data[RTC_YEAR] &= ~config->rtc_count_year_mask;
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data[RTC_YEAR] |= YEARS_TO_DA9063(tm->tm_year) &
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config->rtc_count_year_mask;
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}
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static int da9063_rtc_stop_alarm(struct device *dev)
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{
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struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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return regmap_update_bits(rtc->regmap,
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config->rtc_alarm_year_reg,
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config->rtc_alarm_on_mask,
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0);
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}
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static int da9063_rtc_start_alarm(struct device *dev)
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{
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struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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return regmap_update_bits(rtc->regmap,
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config->rtc_alarm_year_reg,
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config->rtc_alarm_on_mask,
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config->rtc_alarm_on_mask);
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}
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static int da9063_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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unsigned long tm_secs;
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unsigned long al_secs;
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u8 data[RTC_DATA_LEN];
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int ret;
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ret = regmap_bulk_read(rtc->regmap,
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config->rtc_count_secs_reg,
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data, RTC_DATA_LEN);
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if (ret < 0) {
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dev_err(dev, "Failed to read RTC time data: %d\n", ret);
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return ret;
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}
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if (!(data[RTC_SEC] & config->rtc_ready_to_read_mask)) {
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dev_dbg(dev, "RTC not yet ready to be read by the host\n");
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return -EINVAL;
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}
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da9063_data_to_tm(data, tm, rtc);
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rtc_tm_to_time(tm, &tm_secs);
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rtc_tm_to_time(&rtc->alarm_time, &al_secs);
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/* handle the rtc synchronisation delay */
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if (rtc->rtc_sync == true && al_secs - tm_secs == 1)
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memcpy(tm, &rtc->alarm_time, sizeof(struct rtc_time));
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else
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rtc->rtc_sync = false;
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return rtc_valid_tm(tm);
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}
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static int da9063_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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u8 data[RTC_DATA_LEN];
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int ret;
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da9063_tm_to_data(tm, data, rtc);
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ret = regmap_bulk_write(rtc->regmap,
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config->rtc_count_secs_reg,
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data, RTC_DATA_LEN);
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if (ret < 0)
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dev_err(dev, "Failed to set RTC time data: %d\n", ret);
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return ret;
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}
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static int da9063_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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u8 data[RTC_DATA_LEN];
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int ret;
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unsigned int val;
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data[RTC_SEC] = 0;
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ret = regmap_bulk_read(rtc->regmap,
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config->rtc_alarm_secs_reg,
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&data[config->rtc_data_start],
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config->rtc_alarm_len);
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if (ret < 0)
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return ret;
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da9063_data_to_tm(data, &alrm->time, rtc);
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alrm->enabled = !!(data[RTC_YEAR] & config->rtc_alarm_on_mask);
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ret = regmap_read(rtc->regmap,
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config->rtc_event_reg,
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&val);
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if (ret < 0)
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return ret;
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if (val & config->rtc_event_alarm_mask)
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alrm->pending = 1;
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else
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alrm->pending = 0;
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return 0;
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}
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static int da9063_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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u8 data[RTC_DATA_LEN];
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int ret;
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da9063_tm_to_data(&alrm->time, data, rtc);
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ret = da9063_rtc_stop_alarm(dev);
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if (ret < 0) {
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dev_err(dev, "Failed to stop alarm: %d\n", ret);
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return ret;
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}
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ret = regmap_bulk_write(rtc->regmap,
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config->rtc_alarm_secs_reg,
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&data[config->rtc_data_start],
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config->rtc_alarm_len);
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if (ret < 0) {
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dev_err(dev, "Failed to write alarm: %d\n", ret);
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return ret;
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}
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da9063_data_to_tm(data, &rtc->alarm_time, rtc);
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if (alrm->enabled) {
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ret = da9063_rtc_start_alarm(dev);
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if (ret < 0) {
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dev_err(dev, "Failed to start alarm: %d\n", ret);
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return ret;
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}
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}
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return ret;
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}
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static int da9063_rtc_alarm_irq_enable(struct device *dev,
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unsigned int enabled)
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{
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if (enabled)
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return da9063_rtc_start_alarm(dev);
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else
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return da9063_rtc_stop_alarm(dev);
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}
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static irqreturn_t da9063_alarm_event(int irq, void *data)
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{
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struct da9063_compatible_rtc *rtc = data;
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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regmap_update_bits(rtc->regmap,
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config->rtc_alarm_year_reg,
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config->rtc_alarm_on_mask,
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0);
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rtc->rtc_sync = true;
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rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
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return IRQ_HANDLED;
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}
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static const struct rtc_class_ops da9063_rtc_ops = {
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.read_time = da9063_rtc_read_time,
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.set_time = da9063_rtc_set_time,
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.read_alarm = da9063_rtc_read_alarm,
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.set_alarm = da9063_rtc_set_alarm,
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.alarm_irq_enable = da9063_rtc_alarm_irq_enable,
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};
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static int da9063_rtc_probe(struct platform_device *pdev)
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{
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struct da9063_compatible_rtc *rtc;
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const struct da9063_compatible_rtc_regmap *config;
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const struct of_device_id *match;
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int irq_alarm;
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u8 data[RTC_DATA_LEN];
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int ret;
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if (!pdev->dev.of_node)
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return -ENXIO;
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match = of_match_node(da9063_compatible_reg_id_table,
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pdev->dev.of_node);
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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->config = match->data;
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if (of_device_is_compatible(pdev->dev.of_node, "dlg,da9063-rtc")) {
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struct da9063 *chip = dev_get_drvdata(pdev->dev.parent);
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if (chip->variant_code == PMIC_DA9063_AD)
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rtc->config = &da9063_ad_regs;
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}
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rtc->regmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!rtc->regmap) {
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dev_warn(&pdev->dev, "Parent regmap unavailable.\n");
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return -ENXIO;
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}
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config = rtc->config;
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ret = regmap_update_bits(rtc->regmap,
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config->rtc_enable_reg,
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config->rtc_enable_mask,
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config->rtc_enable_mask);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to enable RTC\n");
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return ret;
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}
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ret = regmap_update_bits(rtc->regmap,
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config->rtc_enable_32k_crystal_reg,
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config->rtc_crystal_mask,
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config->rtc_crystal_mask);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to run 32kHz oscillator\n");
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return ret;
|
|
}
|
|
|
|
ret = regmap_update_bits(rtc->regmap,
|
|
config->rtc_alarm_secs_reg,
|
|
config->rtc_alarm_status_mask,
|
|
0);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = regmap_update_bits(rtc->regmap,
|
|
config->rtc_alarm_secs_reg,
|
|
DA9063_ALARM_STATUS_ALARM,
|
|
DA9063_ALARM_STATUS_ALARM);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = regmap_update_bits(rtc->regmap,
|
|
config->rtc_alarm_year_reg,
|
|
config->rtc_tick_on_mask,
|
|
0);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Failed to disable TICKs\n");
|
|
return ret;
|
|
}
|
|
|
|
data[RTC_SEC] = 0;
|
|
ret = regmap_bulk_read(rtc->regmap,
|
|
config->rtc_alarm_secs_reg,
|
|
&data[config->rtc_data_start],
|
|
config->rtc_alarm_len);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Failed to read initial alarm data: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, rtc);
|
|
|
|
irq_alarm = platform_get_irq_byname(pdev, "ALARM");
|
|
ret = devm_request_threaded_irq(&pdev->dev, irq_alarm, NULL,
|
|
da9063_alarm_event,
|
|
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
|
|
"ALARM", rtc);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Failed to request ALARM IRQ %d: %d\n",
|
|
irq_alarm, ret);
|
|
return ret;
|
|
}
|
|
|
|
rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, DA9063_DRVNAME_RTC,
|
|
&da9063_rtc_ops, THIS_MODULE);
|
|
if (IS_ERR(rtc->rtc_dev))
|
|
return PTR_ERR(rtc->rtc_dev);
|
|
|
|
da9063_data_to_tm(data, &rtc->alarm_time, rtc);
|
|
rtc->rtc_sync = false;
|
|
return ret;
|
|
}
|
|
|
|
static struct platform_driver da9063_rtc_driver = {
|
|
.probe = da9063_rtc_probe,
|
|
.driver = {
|
|
.name = DA9063_DRVNAME_RTC,
|
|
.of_match_table = da9063_compatible_reg_id_table,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(da9063_rtc_driver);
|
|
|
|
MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
|
|
MODULE_DESCRIPTION("Real time clock device driver for Dialog DA9063");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:" DA9063_DRVNAME_RTC);
|