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630 lines
15 KiB
630 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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// |
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// Copyright (C) 2018 ROHM Semiconductors |
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// |
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// RTC driver for ROHM BD70528 PMIC |
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#include <linux/bcd.h> |
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#include <linux/mfd/rohm-bd70528.h> |
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#include <linux/mfd/rohm-bd71828.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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/* |
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* We read regs RTC_SEC => RTC_YEAR |
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* this struct is ordered according to chip registers. |
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* Keep it u8 only (or packed) to avoid padding issues. |
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*/ |
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struct bd70528_rtc_day { |
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u8 sec; |
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u8 min; |
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u8 hour; |
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} __packed; |
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struct bd70528_rtc_data { |
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struct bd70528_rtc_day time; |
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u8 week; |
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u8 day; |
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u8 month; |
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u8 year; |
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} __packed; |
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struct bd70528_rtc_wake { |
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struct bd70528_rtc_day time; |
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u8 ctrl; |
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} __packed; |
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struct bd71828_rtc_alm { |
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struct bd70528_rtc_data alm0; |
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struct bd70528_rtc_data alm1; |
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u8 alm_mask; |
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u8 alm1_mask; |
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} __packed; |
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struct bd70528_rtc_alm { |
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struct bd70528_rtc_data data; |
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u8 alm_mask; |
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u8 alm_repeat; |
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} __packed; |
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struct bd70528_rtc { |
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struct rohm_regmap_dev *parent; |
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struct device *dev; |
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u8 reg_time_start; |
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bool has_rtc_timers; |
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}; |
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static int bd70528_set_wake(struct rohm_regmap_dev *bd70528, |
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int enable, int *old_state) |
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{ |
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int ret; |
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unsigned int ctrl_reg; |
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ret = regmap_read(bd70528->regmap, BD70528_REG_WAKE_EN, &ctrl_reg); |
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if (ret) |
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return ret; |
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if (old_state) { |
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if (ctrl_reg & BD70528_MASK_WAKE_EN) |
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*old_state |= BD70528_WAKE_STATE_BIT; |
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else |
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*old_state &= ~BD70528_WAKE_STATE_BIT; |
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if (!enable == !(*old_state & BD70528_WAKE_STATE_BIT)) |
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return 0; |
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} |
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if (enable) |
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ctrl_reg |= BD70528_MASK_WAKE_EN; |
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else |
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ctrl_reg &= ~BD70528_MASK_WAKE_EN; |
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return regmap_write(bd70528->regmap, BD70528_REG_WAKE_EN, |
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ctrl_reg); |
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} |
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static int bd70528_set_elapsed_tmr(struct rohm_regmap_dev *bd70528, |
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int enable, int *old_state) |
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{ |
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int ret; |
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unsigned int ctrl_reg; |
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/* |
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* TBD |
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* What is the purpose of elapsed timer ? |
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* Is the timeout registers counting down, or is the disable - re-enable |
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* going to restart the elapsed-time counting? If counting is restarted |
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* the timeout should be decreased by the amount of time that has |
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* elapsed since starting the timer. Maybe we should store the monotonic |
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* clock value when timer is started so that if RTC is set while timer |
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* is armed we could do the compensation. This is a hack if RTC/system |
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* clk are drifting. OTOH, RTC controlled via I2C is in any case |
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* inaccurate... |
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*/ |
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ret = regmap_read(bd70528->regmap, BD70528_REG_ELAPSED_TIMER_EN, |
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&ctrl_reg); |
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if (ret) |
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return ret; |
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if (old_state) { |
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if (ctrl_reg & BD70528_MASK_ELAPSED_TIMER_EN) |
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*old_state |= BD70528_ELAPSED_STATE_BIT; |
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else |
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*old_state &= ~BD70528_ELAPSED_STATE_BIT; |
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if ((!enable) == (!(*old_state & BD70528_ELAPSED_STATE_BIT))) |
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return 0; |
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} |
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if (enable) |
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ctrl_reg |= BD70528_MASK_ELAPSED_TIMER_EN; |
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else |
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ctrl_reg &= ~BD70528_MASK_ELAPSED_TIMER_EN; |
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return regmap_write(bd70528->regmap, BD70528_REG_ELAPSED_TIMER_EN, |
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ctrl_reg); |
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} |
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static int bd70528_set_rtc_based_timers(struct bd70528_rtc *r, int new_state, |
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int *old_state) |
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{ |
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int ret; |
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ret = bd70528_wdt_set(r->parent, new_state & BD70528_WDT_STATE_BIT, |
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old_state); |
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if (ret) { |
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dev_err(r->dev, |
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"Failed to disable WDG for RTC setting (%d)\n", ret); |
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return ret; |
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} |
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ret = bd70528_set_elapsed_tmr(r->parent, |
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new_state & BD70528_ELAPSED_STATE_BIT, |
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old_state); |
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if (ret) { |
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dev_err(r->dev, |
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"Failed to disable 'elapsed timer' for RTC setting\n"); |
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return ret; |
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} |
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ret = bd70528_set_wake(r->parent, new_state & BD70528_WAKE_STATE_BIT, |
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old_state); |
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if (ret) { |
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dev_err(r->dev, |
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"Failed to disable 'wake timer' for RTC setting\n"); |
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return ret; |
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} |
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return ret; |
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} |
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static int bd70528_re_enable_rtc_based_timers(struct bd70528_rtc *r, |
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int old_state) |
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{ |
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if (!r->has_rtc_timers) |
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return 0; |
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return bd70528_set_rtc_based_timers(r, old_state, NULL); |
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} |
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static int bd70528_disable_rtc_based_timers(struct bd70528_rtc *r, |
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int *old_state) |
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{ |
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if (!r->has_rtc_timers) |
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return 0; |
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return bd70528_set_rtc_based_timers(r, 0, old_state); |
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} |
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static inline void tmday2rtc(struct rtc_time *t, struct bd70528_rtc_day *d) |
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{ |
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d->sec &= ~BD70528_MASK_RTC_SEC; |
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d->min &= ~BD70528_MASK_RTC_MINUTE; |
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d->hour &= ~BD70528_MASK_RTC_HOUR; |
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d->sec |= bin2bcd(t->tm_sec); |
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d->min |= bin2bcd(t->tm_min); |
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d->hour |= bin2bcd(t->tm_hour); |
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} |
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static inline void tm2rtc(struct rtc_time *t, struct bd70528_rtc_data *r) |
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{ |
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r->day &= ~BD70528_MASK_RTC_DAY; |
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r->week &= ~BD70528_MASK_RTC_WEEK; |
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r->month &= ~BD70528_MASK_RTC_MONTH; |
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/* |
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* PM and 24H bits are not used by Wake - thus we clear them |
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* here and not in tmday2rtc() which is also used by wake. |
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*/ |
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r->time.hour &= ~(BD70528_MASK_RTC_HOUR_PM | BD70528_MASK_RTC_HOUR_24H); |
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tmday2rtc(t, &r->time); |
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/* |
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* We do always set time in 24H mode. |
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*/ |
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r->time.hour |= BD70528_MASK_RTC_HOUR_24H; |
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r->day |= bin2bcd(t->tm_mday); |
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r->week |= bin2bcd(t->tm_wday); |
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r->month |= bin2bcd(t->tm_mon + 1); |
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r->year = bin2bcd(t->tm_year - 100); |
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} |
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static inline void rtc2tm(struct bd70528_rtc_data *r, struct rtc_time *t) |
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{ |
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t->tm_sec = bcd2bin(r->time.sec & BD70528_MASK_RTC_SEC); |
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t->tm_min = bcd2bin(r->time.min & BD70528_MASK_RTC_MINUTE); |
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t->tm_hour = bcd2bin(r->time.hour & BD70528_MASK_RTC_HOUR); |
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/* |
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* If RTC is in 12H mode, then bit BD70528_MASK_RTC_HOUR_PM |
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* is not BCD value but tells whether it is AM or PM |
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*/ |
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if (!(r->time.hour & BD70528_MASK_RTC_HOUR_24H)) { |
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t->tm_hour %= 12; |
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if (r->time.hour & BD70528_MASK_RTC_HOUR_PM) |
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t->tm_hour += 12; |
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} |
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t->tm_mday = bcd2bin(r->day & BD70528_MASK_RTC_DAY); |
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t->tm_mon = bcd2bin(r->month & BD70528_MASK_RTC_MONTH) - 1; |
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t->tm_year = 100 + bcd2bin(r->year & BD70528_MASK_RTC_YEAR); |
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t->tm_wday = bcd2bin(r->week & BD70528_MASK_RTC_WEEK); |
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} |
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static int bd71828_set_alarm(struct device *dev, struct rtc_wkalrm *a) |
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{ |
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int ret; |
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struct bd71828_rtc_alm alm; |
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struct bd70528_rtc *r = dev_get_drvdata(dev); |
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struct rohm_regmap_dev *parent = r->parent; |
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ret = regmap_bulk_read(parent->regmap, BD71828_REG_RTC_ALM_START, |
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&alm, sizeof(alm)); |
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if (ret) { |
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dev_err(dev, "Failed to read alarm regs\n"); |
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return ret; |
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} |
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tm2rtc(&a->time, &alm.alm0); |
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if (!a->enabled) |
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alm.alm_mask &= ~BD70528_MASK_ALM_EN; |
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else |
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alm.alm_mask |= BD70528_MASK_ALM_EN; |
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ret = regmap_bulk_write(parent->regmap, BD71828_REG_RTC_ALM_START, |
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&alm, sizeof(alm)); |
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if (ret) |
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dev_err(dev, "Failed to set alarm time\n"); |
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return ret; |
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} |
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static int bd70528_set_alarm(struct device *dev, struct rtc_wkalrm *a) |
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{ |
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struct bd70528_rtc_wake wake; |
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struct bd70528_rtc_alm alm; |
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int ret; |
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struct bd70528_rtc *r = dev_get_drvdata(dev); |
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struct rohm_regmap_dev *parent = r->parent; |
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ret = regmap_bulk_read(parent->regmap, BD70528_REG_RTC_WAKE_START, |
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&wake, sizeof(wake)); |
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if (ret) { |
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dev_err(dev, "Failed to read wake regs\n"); |
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return ret; |
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} |
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ret = regmap_bulk_read(parent->regmap, BD70528_REG_RTC_ALM_START, |
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&alm, sizeof(alm)); |
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if (ret) { |
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dev_err(dev, "Failed to read alarm regs\n"); |
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return ret; |
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} |
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tm2rtc(&a->time, &alm.data); |
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tmday2rtc(&a->time, &wake.time); |
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if (a->enabled) { |
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alm.alm_mask &= ~BD70528_MASK_ALM_EN; |
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wake.ctrl |= BD70528_MASK_WAKE_EN; |
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} else { |
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alm.alm_mask |= BD70528_MASK_ALM_EN; |
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wake.ctrl &= ~BD70528_MASK_WAKE_EN; |
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} |
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ret = regmap_bulk_write(parent->regmap, |
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BD70528_REG_RTC_WAKE_START, &wake, |
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sizeof(wake)); |
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if (ret) { |
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dev_err(dev, "Failed to set wake time\n"); |
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return ret; |
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} |
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ret = regmap_bulk_write(parent->regmap, BD70528_REG_RTC_ALM_START, |
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&alm, sizeof(alm)); |
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if (ret) |
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dev_err(dev, "Failed to set alarm time\n"); |
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return ret; |
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} |
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static int bd71828_read_alarm(struct device *dev, struct rtc_wkalrm *a) |
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{ |
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int ret; |
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struct bd71828_rtc_alm alm; |
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struct bd70528_rtc *r = dev_get_drvdata(dev); |
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struct rohm_regmap_dev *parent = r->parent; |
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ret = regmap_bulk_read(parent->regmap, BD71828_REG_RTC_ALM_START, |
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&alm, sizeof(alm)); |
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if (ret) { |
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dev_err(dev, "Failed to read alarm regs\n"); |
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return ret; |
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} |
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rtc2tm(&alm.alm0, &a->time); |
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a->time.tm_mday = -1; |
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a->time.tm_mon = -1; |
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a->time.tm_year = -1; |
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a->enabled = !!(alm.alm_mask & BD70528_MASK_ALM_EN); |
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a->pending = 0; |
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return 0; |
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} |
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static int bd70528_read_alarm(struct device *dev, struct rtc_wkalrm *a) |
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{ |
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struct bd70528_rtc_alm alm; |
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int ret; |
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struct bd70528_rtc *r = dev_get_drvdata(dev); |
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struct rohm_regmap_dev *parent = r->parent; |
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ret = regmap_bulk_read(parent->regmap, BD70528_REG_RTC_ALM_START, |
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&alm, sizeof(alm)); |
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if (ret) { |
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dev_err(dev, "Failed to read alarm regs\n"); |
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return ret; |
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} |
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rtc2tm(&alm.data, &a->time); |
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a->time.tm_mday = -1; |
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a->time.tm_mon = -1; |
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a->time.tm_year = -1; |
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a->enabled = !(alm.alm_mask & BD70528_MASK_ALM_EN); |
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a->pending = 0; |
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return 0; |
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} |
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static int bd70528_set_time_locked(struct device *dev, struct rtc_time *t) |
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{ |
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int ret, tmpret, old_states; |
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struct bd70528_rtc_data rtc_data; |
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struct bd70528_rtc *r = dev_get_drvdata(dev); |
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struct rohm_regmap_dev *parent = r->parent; |
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ret = bd70528_disable_rtc_based_timers(r, &old_states); |
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if (ret) |
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return ret; |
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tmpret = regmap_bulk_read(parent->regmap, |
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r->reg_time_start, &rtc_data, |
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sizeof(rtc_data)); |
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if (tmpret) { |
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dev_err(dev, "Failed to read RTC time registers\n"); |
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goto renable_out; |
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} |
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tm2rtc(t, &rtc_data); |
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tmpret = regmap_bulk_write(parent->regmap, |
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r->reg_time_start, &rtc_data, |
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sizeof(rtc_data)); |
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if (tmpret) { |
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dev_err(dev, "Failed to set RTC time\n"); |
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goto renable_out; |
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} |
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renable_out: |
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ret = bd70528_re_enable_rtc_based_timers(r, old_states); |
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if (tmpret) |
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ret = tmpret; |
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return ret; |
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} |
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static int bd71828_set_time(struct device *dev, struct rtc_time *t) |
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{ |
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return bd70528_set_time_locked(dev, t); |
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} |
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static int bd70528_set_time(struct device *dev, struct rtc_time *t) |
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{ |
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int ret; |
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struct bd70528_rtc *r = dev_get_drvdata(dev); |
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bd70528_wdt_lock(r->parent); |
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ret = bd70528_set_time_locked(dev, t); |
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bd70528_wdt_unlock(r->parent); |
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return ret; |
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} |
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static int bd70528_get_time(struct device *dev, struct rtc_time *t) |
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{ |
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struct bd70528_rtc *r = dev_get_drvdata(dev); |
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struct rohm_regmap_dev *parent = r->parent; |
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struct bd70528_rtc_data rtc_data; |
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int ret; |
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/* read the RTC date and time registers all at once */ |
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ret = regmap_bulk_read(parent->regmap, |
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r->reg_time_start, &rtc_data, |
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sizeof(rtc_data)); |
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if (ret) { |
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dev_err(dev, "Failed to read RTC time (err %d)\n", ret); |
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return ret; |
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} |
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rtc2tm(&rtc_data, t); |
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return 0; |
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} |
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static int bd70528_alm_enable(struct device *dev, unsigned int enabled) |
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{ |
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int ret; |
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unsigned int enableval = BD70528_MASK_ALM_EN; |
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struct bd70528_rtc *r = dev_get_drvdata(dev); |
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if (enabled) |
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enableval = 0; |
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bd70528_wdt_lock(r->parent); |
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ret = bd70528_set_wake(r->parent, enabled, NULL); |
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if (ret) { |
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dev_err(dev, "Failed to change wake state\n"); |
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goto out_unlock; |
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} |
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ret = regmap_update_bits(r->parent->regmap, BD70528_REG_RTC_ALM_MASK, |
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BD70528_MASK_ALM_EN, enableval); |
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if (ret) |
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dev_err(dev, "Failed to change alarm state\n"); |
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out_unlock: |
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bd70528_wdt_unlock(r->parent); |
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return ret; |
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} |
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static int bd71828_alm_enable(struct device *dev, unsigned int enabled) |
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{ |
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int ret; |
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struct bd70528_rtc *r = dev_get_drvdata(dev); |
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unsigned int enableval = BD70528_MASK_ALM_EN; |
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if (!enabled) |
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enableval = 0; |
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ret = regmap_update_bits(r->parent->regmap, BD71828_REG_RTC_ALM0_MASK, |
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BD70528_MASK_ALM_EN, enableval); |
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if (ret) |
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dev_err(dev, "Failed to change alarm state\n"); |
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return ret; |
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} |
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static const struct rtc_class_ops bd70528_rtc_ops = { |
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.read_time = bd70528_get_time, |
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.set_time = bd70528_set_time, |
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.read_alarm = bd70528_read_alarm, |
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.set_alarm = bd70528_set_alarm, |
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.alarm_irq_enable = bd70528_alm_enable, |
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}; |
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static const struct rtc_class_ops bd71828_rtc_ops = { |
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.read_time = bd70528_get_time, |
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.set_time = bd71828_set_time, |
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.read_alarm = bd71828_read_alarm, |
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.set_alarm = bd71828_set_alarm, |
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.alarm_irq_enable = bd71828_alm_enable, |
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}; |
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static irqreturn_t alm_hndlr(int irq, void *data) |
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{ |
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struct rtc_device *rtc = data; |
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rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF | RTC_PF); |
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return IRQ_HANDLED; |
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} |
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static int bd70528_probe(struct platform_device *pdev) |
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{ |
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struct bd70528_rtc *bd_rtc; |
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const struct rtc_class_ops *rtc_ops; |
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struct rohm_regmap_dev *parent; |
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const char *irq_name; |
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int ret; |
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struct rtc_device *rtc; |
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int irq; |
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unsigned int hr; |
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bool enable_main_irq = false; |
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u8 hour_reg; |
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enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data; |
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parent = dev_get_drvdata(pdev->dev.parent); |
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if (!parent) { |
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dev_err(&pdev->dev, "No MFD driver data\n"); |
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return -EINVAL; |
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} |
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bd_rtc = devm_kzalloc(&pdev->dev, sizeof(*bd_rtc), GFP_KERNEL); |
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if (!bd_rtc) |
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return -ENOMEM; |
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bd_rtc->parent = parent; |
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bd_rtc->dev = &pdev->dev; |
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switch (chip) { |
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case ROHM_CHIP_TYPE_BD70528: |
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irq_name = "bd70528-rtc-alm"; |
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bd_rtc->has_rtc_timers = true; |
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bd_rtc->reg_time_start = BD70528_REG_RTC_START; |
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hour_reg = BD70528_REG_RTC_HOUR; |
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enable_main_irq = true; |
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rtc_ops = &bd70528_rtc_ops; |
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break; |
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case ROHM_CHIP_TYPE_BD71828: |
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irq_name = "bd71828-rtc-alm-0"; |
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bd_rtc->reg_time_start = BD71828_REG_RTC_START; |
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hour_reg = BD71828_REG_RTC_HOUR; |
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rtc_ops = &bd71828_rtc_ops; |
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break; |
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default: |
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dev_err(&pdev->dev, "Unknown chip\n"); |
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return -ENOENT; |
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} |
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|
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irq = platform_get_irq_byname(pdev, irq_name); |
|
|
|
if (irq < 0) |
|
return irq; |
|
|
|
platform_set_drvdata(pdev, bd_rtc); |
|
|
|
ret = regmap_read(parent->regmap, hour_reg, &hr); |
|
|
|
if (ret) { |
|
dev_err(&pdev->dev, "Failed to reag RTC clock\n"); |
|
return ret; |
|
} |
|
|
|
if (!(hr & BD70528_MASK_RTC_HOUR_24H)) { |
|
struct rtc_time t; |
|
|
|
ret = rtc_ops->read_time(&pdev->dev, &t); |
|
|
|
if (!ret) |
|
ret = rtc_ops->set_time(&pdev->dev, &t); |
|
|
|
if (ret) { |
|
dev_err(&pdev->dev, |
|
"Setting 24H clock for RTC failed\n"); |
|
return ret; |
|
} |
|
} |
|
|
|
device_set_wakeup_capable(&pdev->dev, true); |
|
device_wakeup_enable(&pdev->dev); |
|
|
|
rtc = devm_rtc_allocate_device(&pdev->dev); |
|
if (IS_ERR(rtc)) { |
|
dev_err(&pdev->dev, "RTC device creation failed\n"); |
|
return PTR_ERR(rtc); |
|
} |
|
|
|
rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; |
|
rtc->range_max = RTC_TIMESTAMP_END_2099; |
|
rtc->ops = rtc_ops; |
|
|
|
/* Request alarm IRQ prior to registerig the RTC */ |
|
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, &alm_hndlr, |
|
IRQF_ONESHOT, "bd70528-rtc", rtc); |
|
if (ret) |
|
return ret; |
|
|
|
/* |
|
* BD70528 irq controller is not touching the main mask register. |
|
* So enable the RTC block interrupts at main level. We can just |
|
* leave them enabled as irq-controller should disable irqs |
|
* from sub-registers when IRQ is disabled or freed. |
|
*/ |
|
if (enable_main_irq) { |
|
ret = regmap_update_bits(parent->regmap, |
|
BD70528_REG_INT_MAIN_MASK, |
|
BD70528_INT_RTC_MASK, 0); |
|
if (ret) { |
|
dev_err(&pdev->dev, "Failed to enable RTC interrupts\n"); |
|
return ret; |
|
} |
|
} |
|
|
|
return devm_rtc_register_device(rtc); |
|
} |
|
|
|
static const struct platform_device_id bd718x7_rtc_id[] = { |
|
{ "bd70528-rtc", ROHM_CHIP_TYPE_BD70528 }, |
|
{ "bd71828-rtc", ROHM_CHIP_TYPE_BD71828 }, |
|
{ }, |
|
}; |
|
MODULE_DEVICE_TABLE(platform, bd718x7_rtc_id); |
|
|
|
static struct platform_driver bd70528_rtc = { |
|
.driver = { |
|
.name = "bd70528-rtc" |
|
}, |
|
.probe = bd70528_probe, |
|
.id_table = bd718x7_rtc_id, |
|
}; |
|
|
|
module_platform_driver(bd70528_rtc); |
|
|
|
MODULE_AUTHOR("Matti Vaittinen <[email protected]>"); |
|
MODULE_DESCRIPTION("ROHM BD70528 and BD71828 PMIC RTC driver"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS("platform:bd70528-rtc");
|
|
|