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322 lines
7.6 KiB
322 lines
7.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* TI LP8788 MFD - rtc driver |
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* |
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* Copyright 2012 Texas Instruments |
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* |
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* Author: Milo(Woogyom) Kim <[email protected]> |
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*/ |
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#include <linux/err.h> |
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#include <linux/irqdomain.h> |
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#include <linux/mfd/lp8788.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/rtc.h> |
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#include <linux/slab.h> |
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/* register address */ |
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#define LP8788_INTEN_3 0x05 |
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#define LP8788_RTC_UNLOCK 0x64 |
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#define LP8788_RTC_SEC 0x70 |
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#define LP8788_ALM1_SEC 0x77 |
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#define LP8788_ALM1_EN 0x7D |
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#define LP8788_ALM2_SEC 0x7E |
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#define LP8788_ALM2_EN 0x84 |
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/* mask/shift bits */ |
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#define LP8788_INT_RTC_ALM1_M BIT(1) /* Addr 05h */ |
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#define LP8788_INT_RTC_ALM1_S 1 |
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#define LP8788_INT_RTC_ALM2_M BIT(2) /* Addr 05h */ |
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#define LP8788_INT_RTC_ALM2_S 2 |
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#define LP8788_ALM_EN_M BIT(7) /* Addr 7Dh or 84h */ |
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#define LP8788_ALM_EN_S 7 |
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#define DEFAULT_ALARM_SEL LP8788_ALARM_1 |
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#define LP8788_MONTH_OFFSET 1 |
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#define LP8788_BASE_YEAR 2000 |
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#define MAX_WDAY_BITS 7 |
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#define LP8788_WDAY_SET 1 |
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#define RTC_UNLOCK 0x1 |
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#define RTC_LATCH 0x2 |
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#define ALARM_IRQ_FLAG (RTC_IRQF | RTC_AF) |
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enum lp8788_time { |
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LPTIME_SEC, |
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LPTIME_MIN, |
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LPTIME_HOUR, |
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LPTIME_MDAY, |
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LPTIME_MON, |
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LPTIME_YEAR, |
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LPTIME_WDAY, |
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LPTIME_MAX, |
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}; |
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struct lp8788_rtc { |
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struct lp8788 *lp; |
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struct rtc_device *rdev; |
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enum lp8788_alarm_sel alarm; |
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int irq; |
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}; |
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static const u8 addr_alarm_sec[LP8788_ALARM_MAX] = { |
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LP8788_ALM1_SEC, |
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LP8788_ALM2_SEC, |
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}; |
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static const u8 addr_alarm_en[LP8788_ALARM_MAX] = { |
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LP8788_ALM1_EN, |
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LP8788_ALM2_EN, |
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}; |
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static const u8 mask_alarm_en[LP8788_ALARM_MAX] = { |
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LP8788_INT_RTC_ALM1_M, |
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LP8788_INT_RTC_ALM2_M, |
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}; |
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static const u8 shift_alarm_en[LP8788_ALARM_MAX] = { |
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LP8788_INT_RTC_ALM1_S, |
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LP8788_INT_RTC_ALM2_S, |
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}; |
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static int _to_tm_wday(u8 lp8788_wday) |
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{ |
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int i; |
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if (lp8788_wday == 0) |
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return 0; |
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/* lookup defined weekday from read register value */ |
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for (i = 0; i < MAX_WDAY_BITS; i++) { |
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if ((lp8788_wday >> i) == LP8788_WDAY_SET) |
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break; |
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} |
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return i + 1; |
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} |
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static inline int _to_lp8788_wday(int tm_wday) |
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{ |
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return LP8788_WDAY_SET << (tm_wday - 1); |
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} |
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static void lp8788_rtc_unlock(struct lp8788 *lp) |
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{ |
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lp8788_write_byte(lp, LP8788_RTC_UNLOCK, RTC_UNLOCK); |
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lp8788_write_byte(lp, LP8788_RTC_UNLOCK, RTC_LATCH); |
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} |
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static int lp8788_rtc_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct lp8788_rtc *rtc = dev_get_drvdata(dev); |
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struct lp8788 *lp = rtc->lp; |
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u8 data[LPTIME_MAX]; |
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int ret; |
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lp8788_rtc_unlock(lp); |
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ret = lp8788_read_multi_bytes(lp, LP8788_RTC_SEC, data, LPTIME_MAX); |
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if (ret) |
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return ret; |
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tm->tm_sec = data[LPTIME_SEC]; |
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tm->tm_min = data[LPTIME_MIN]; |
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tm->tm_hour = data[LPTIME_HOUR]; |
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tm->tm_mday = data[LPTIME_MDAY]; |
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tm->tm_mon = data[LPTIME_MON] - LP8788_MONTH_OFFSET; |
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tm->tm_year = data[LPTIME_YEAR] + LP8788_BASE_YEAR - 1900; |
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tm->tm_wday = _to_tm_wday(data[LPTIME_WDAY]); |
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return 0; |
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} |
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static int lp8788_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct lp8788_rtc *rtc = dev_get_drvdata(dev); |
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struct lp8788 *lp = rtc->lp; |
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u8 data[LPTIME_MAX - 1]; |
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int ret, i, year; |
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year = tm->tm_year + 1900 - LP8788_BASE_YEAR; |
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if (year < 0) { |
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dev_err(lp->dev, "invalid year: %d\n", year); |
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return -EINVAL; |
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} |
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/* because rtc weekday is a readonly register, do not update */ |
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data[LPTIME_SEC] = tm->tm_sec; |
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data[LPTIME_MIN] = tm->tm_min; |
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data[LPTIME_HOUR] = tm->tm_hour; |
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data[LPTIME_MDAY] = tm->tm_mday; |
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data[LPTIME_MON] = tm->tm_mon + LP8788_MONTH_OFFSET; |
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data[LPTIME_YEAR] = year; |
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for (i = 0; i < ARRAY_SIZE(data); i++) { |
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ret = lp8788_write_byte(lp, LP8788_RTC_SEC + i, data[i]); |
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if (ret) |
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return ret; |
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} |
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return 0; |
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} |
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static int lp8788_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
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{ |
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struct lp8788_rtc *rtc = dev_get_drvdata(dev); |
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struct lp8788 *lp = rtc->lp; |
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struct rtc_time *tm = &alarm->time; |
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u8 addr, data[LPTIME_MAX]; |
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int ret; |
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addr = addr_alarm_sec[rtc->alarm]; |
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ret = lp8788_read_multi_bytes(lp, addr, data, LPTIME_MAX); |
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if (ret) |
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return ret; |
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tm->tm_sec = data[LPTIME_SEC]; |
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tm->tm_min = data[LPTIME_MIN]; |
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tm->tm_hour = data[LPTIME_HOUR]; |
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tm->tm_mday = data[LPTIME_MDAY]; |
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tm->tm_mon = data[LPTIME_MON] - LP8788_MONTH_OFFSET; |
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tm->tm_year = data[LPTIME_YEAR] + LP8788_BASE_YEAR - 1900; |
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tm->tm_wday = _to_tm_wday(data[LPTIME_WDAY]); |
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alarm->enabled = data[LPTIME_WDAY] & LP8788_ALM_EN_M; |
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return 0; |
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} |
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static int lp8788_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
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{ |
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struct lp8788_rtc *rtc = dev_get_drvdata(dev); |
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struct lp8788 *lp = rtc->lp; |
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struct rtc_time *tm = &alarm->time; |
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u8 addr, data[LPTIME_MAX]; |
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int ret, i, year; |
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year = tm->tm_year + 1900 - LP8788_BASE_YEAR; |
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if (year < 0) { |
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dev_err(lp->dev, "invalid year: %d\n", year); |
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return -EINVAL; |
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} |
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data[LPTIME_SEC] = tm->tm_sec; |
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data[LPTIME_MIN] = tm->tm_min; |
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data[LPTIME_HOUR] = tm->tm_hour; |
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data[LPTIME_MDAY] = tm->tm_mday; |
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data[LPTIME_MON] = tm->tm_mon + LP8788_MONTH_OFFSET; |
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data[LPTIME_YEAR] = year; |
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data[LPTIME_WDAY] = _to_lp8788_wday(tm->tm_wday); |
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for (i = 0; i < ARRAY_SIZE(data); i++) { |
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addr = addr_alarm_sec[rtc->alarm] + i; |
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ret = lp8788_write_byte(lp, addr, data[i]); |
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if (ret) |
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return ret; |
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} |
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alarm->enabled = 1; |
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addr = addr_alarm_en[rtc->alarm]; |
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return lp8788_update_bits(lp, addr, LP8788_ALM_EN_M, |
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alarm->enabled << LP8788_ALM_EN_S); |
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} |
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static int lp8788_alarm_irq_enable(struct device *dev, unsigned int enable) |
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{ |
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struct lp8788_rtc *rtc = dev_get_drvdata(dev); |
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struct lp8788 *lp = rtc->lp; |
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u8 mask, shift; |
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if (!rtc->irq) |
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return -EIO; |
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mask = mask_alarm_en[rtc->alarm]; |
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shift = shift_alarm_en[rtc->alarm]; |
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return lp8788_update_bits(lp, LP8788_INTEN_3, mask, enable << shift); |
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} |
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static const struct rtc_class_ops lp8788_rtc_ops = { |
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.read_time = lp8788_rtc_read_time, |
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.set_time = lp8788_rtc_set_time, |
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.read_alarm = lp8788_read_alarm, |
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.set_alarm = lp8788_set_alarm, |
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.alarm_irq_enable = lp8788_alarm_irq_enable, |
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}; |
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static irqreturn_t lp8788_alarm_irq_handler(int irq, void *ptr) |
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{ |
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struct lp8788_rtc *rtc = ptr; |
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rtc_update_irq(rtc->rdev, 1, ALARM_IRQ_FLAG); |
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return IRQ_HANDLED; |
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} |
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static int lp8788_alarm_irq_register(struct platform_device *pdev, |
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struct lp8788_rtc *rtc) |
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{ |
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struct resource *r; |
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struct lp8788 *lp = rtc->lp; |
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struct irq_domain *irqdm = lp->irqdm; |
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int irq; |
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rtc->irq = 0; |
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/* even the alarm IRQ number is not specified, rtc time should work */ |
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r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, LP8788_ALM_IRQ); |
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if (!r) |
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return 0; |
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if (rtc->alarm == LP8788_ALARM_1) |
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irq = r->start; |
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else |
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irq = r->end; |
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rtc->irq = irq_create_mapping(irqdm, irq); |
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return devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL, |
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lp8788_alarm_irq_handler, |
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0, LP8788_ALM_IRQ, rtc); |
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} |
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static int lp8788_rtc_probe(struct platform_device *pdev) |
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{ |
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struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent); |
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struct lp8788_rtc *rtc; |
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struct device *dev = &pdev->dev; |
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rtc = devm_kzalloc(dev, sizeof(struct lp8788_rtc), GFP_KERNEL); |
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if (!rtc) |
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return -ENOMEM; |
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rtc->lp = lp; |
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rtc->alarm = lp->pdata ? lp->pdata->alarm_sel : DEFAULT_ALARM_SEL; |
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platform_set_drvdata(pdev, rtc); |
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device_init_wakeup(dev, 1); |
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rtc->rdev = devm_rtc_device_register(dev, "lp8788_rtc", |
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&lp8788_rtc_ops, THIS_MODULE); |
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if (IS_ERR(rtc->rdev)) { |
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dev_err(dev, "can not register rtc device\n"); |
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return PTR_ERR(rtc->rdev); |
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} |
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if (lp8788_alarm_irq_register(pdev, rtc)) |
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dev_warn(lp->dev, "no rtc irq handler\n"); |
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return 0; |
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} |
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static struct platform_driver lp8788_rtc_driver = { |
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.probe = lp8788_rtc_probe, |
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.driver = { |
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.name = LP8788_DEV_RTC, |
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}, |
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}; |
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module_platform_driver(lp8788_rtc_driver); |
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MODULE_DESCRIPTION("Texas Instruments LP8788 RTC Driver"); |
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MODULE_AUTHOR("Milo Kim"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:lp8788-rtc");
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