328 lines
7.7 KiB
C
328 lines
7.7 KiB
C
/*
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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 <milo.kim@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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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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.owner = THIS_MODULE,
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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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