332 lines
8.7 KiB
C
332 lines
8.7 KiB
C
/*
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* rtc-rc5t583.c -- RICOH RC5T583 Real Time Clock
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*
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* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
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* Author: Venu Byravarasu <vbyravarasu@nvidia.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/rc5t583.h>
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struct rc5t583_rtc {
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struct rtc_device *rtc;
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/* To store the list of enabled interrupts, during system suspend */
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u32 irqen;
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};
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/* Total number of RTC registers needed to set time*/
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#define NUM_TIME_REGS (RC5T583_RTC_YEAR - RC5T583_RTC_SEC + 1)
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/* Total number of RTC registers needed to set Y-Alarm*/
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#define NUM_YAL_REGS (RC5T583_RTC_AY_YEAR - RC5T583_RTC_AY_MIN + 1)
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/* Set Y-Alarm interrupt */
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#define SET_YAL BIT(5)
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/* Get Y-Alarm interrupt status*/
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#define GET_YAL_STATUS BIT(3)
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static int rc5t583_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
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{
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
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u8 val;
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/* Set Y-Alarm, based on 'enabled' */
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val = enabled ? SET_YAL : 0;
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return regmap_update_bits(rc5t583->regmap, RC5T583_RTC_CTL1, SET_YAL,
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val);
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}
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/*
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* Gets current rc5t583 RTC time and date parameters.
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*
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* The RTC's time/alarm representation is not what gmtime(3) requires
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* Linux to use:
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*
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* - Months are 1..12 vs Linux 0-11
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* - Years are 0..99 vs Linux 1900..N (we assume 21st century)
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*/
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static int rc5t583_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
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u8 rtc_data[NUM_TIME_REGS];
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int ret;
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ret = regmap_bulk_read(rc5t583->regmap, RC5T583_RTC_SEC, rtc_data,
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NUM_TIME_REGS);
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if (ret < 0) {
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dev_err(dev, "RTC read time failed with err:%d\n", ret);
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return ret;
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}
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tm->tm_sec = bcd2bin(rtc_data[0]);
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tm->tm_min = bcd2bin(rtc_data[1]);
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tm->tm_hour = bcd2bin(rtc_data[2]);
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tm->tm_wday = bcd2bin(rtc_data[3]);
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tm->tm_mday = bcd2bin(rtc_data[4]);
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tm->tm_mon = bcd2bin(rtc_data[5]) - 1;
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tm->tm_year = bcd2bin(rtc_data[6]) + 100;
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return ret;
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}
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static int rc5t583_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
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unsigned char rtc_data[NUM_TIME_REGS];
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int ret;
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rtc_data[0] = bin2bcd(tm->tm_sec);
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rtc_data[1] = bin2bcd(tm->tm_min);
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rtc_data[2] = bin2bcd(tm->tm_hour);
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rtc_data[3] = bin2bcd(tm->tm_wday);
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rtc_data[4] = bin2bcd(tm->tm_mday);
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rtc_data[5] = bin2bcd(tm->tm_mon + 1);
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rtc_data[6] = bin2bcd(tm->tm_year - 100);
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ret = regmap_bulk_write(rc5t583->regmap, RC5T583_RTC_SEC, rtc_data,
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NUM_TIME_REGS);
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if (ret < 0) {
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dev_err(dev, "RTC set time failed with error %d\n", ret);
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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 rc5t583_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
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{
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
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unsigned char alarm_data[NUM_YAL_REGS];
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u32 interrupt_enable;
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int ret;
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ret = regmap_bulk_read(rc5t583->regmap, RC5T583_RTC_AY_MIN, alarm_data,
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NUM_YAL_REGS);
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if (ret < 0) {
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dev_err(dev, "rtc_read_alarm error %d\n", ret);
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return ret;
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}
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alm->time.tm_min = bcd2bin(alarm_data[0]);
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alm->time.tm_hour = bcd2bin(alarm_data[1]);
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alm->time.tm_mday = bcd2bin(alarm_data[2]);
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alm->time.tm_mon = bcd2bin(alarm_data[3]) - 1;
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alm->time.tm_year = bcd2bin(alarm_data[4]) + 100;
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ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL1, &interrupt_enable);
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if (ret < 0)
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return ret;
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/* check if YALE is set */
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if (interrupt_enable & SET_YAL)
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alm->enabled = 1;
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return ret;
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}
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static int rc5t583_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
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{
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
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unsigned char alarm_data[NUM_YAL_REGS];
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int ret;
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ret = rc5t583_rtc_alarm_irq_enable(dev, 0);
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if (ret)
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return ret;
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alarm_data[0] = bin2bcd(alm->time.tm_min);
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alarm_data[1] = bin2bcd(alm->time.tm_hour);
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alarm_data[2] = bin2bcd(alm->time.tm_mday);
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alarm_data[3] = bin2bcd(alm->time.tm_mon + 1);
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alarm_data[4] = bin2bcd(alm->time.tm_year - 100);
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ret = regmap_bulk_write(rc5t583->regmap, RC5T583_RTC_AY_MIN, alarm_data,
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NUM_YAL_REGS);
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if (ret) {
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dev_err(dev, "rtc_set_alarm error %d\n", ret);
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return ret;
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}
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if (alm->enabled)
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ret = rc5t583_rtc_alarm_irq_enable(dev, 1);
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return ret;
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}
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static irqreturn_t rc5t583_rtc_interrupt(int irq, void *rtc)
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{
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struct device *dev = rtc;
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
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struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev);
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unsigned long events = 0;
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int ret;
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u32 rtc_reg;
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ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL2, &rtc_reg);
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if (ret < 0)
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return IRQ_NONE;
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if (rtc_reg & GET_YAL_STATUS) {
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events = RTC_IRQF | RTC_AF;
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/* clear pending Y-alarm interrupt bit */
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rtc_reg &= ~GET_YAL_STATUS;
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}
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ret = regmap_write(rc5t583->regmap, RC5T583_RTC_CTL2, rtc_reg);
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if (ret)
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return IRQ_NONE;
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/* Notify RTC core on event */
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rtc_update_irq(rc5t583_rtc->rtc, 1, events);
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return IRQ_HANDLED;
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}
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static const struct rtc_class_ops rc5t583_rtc_ops = {
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.read_time = rc5t583_rtc_read_time,
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.set_time = rc5t583_rtc_set_time,
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.read_alarm = rc5t583_rtc_read_alarm,
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.set_alarm = rc5t583_rtc_set_alarm,
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.alarm_irq_enable = rc5t583_rtc_alarm_irq_enable,
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};
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static int __devinit rc5t583_rtc_probe(struct platform_device *pdev)
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{
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struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
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struct rc5t583_rtc *ricoh_rtc;
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struct rc5t583_platform_data *pmic_plat_data;
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int ret;
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int irq;
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ricoh_rtc = devm_kzalloc(&pdev->dev, sizeof(struct rc5t583_rtc),
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GFP_KERNEL);
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if (!ricoh_rtc)
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return -ENOMEM;
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platform_set_drvdata(pdev, ricoh_rtc);
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/* Clear pending interrupts */
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ret = regmap_write(rc5t583->regmap, RC5T583_RTC_CTL2, 0);
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if (ret < 0)
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return ret;
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/* clear RTC Adjust register */
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ret = regmap_write(rc5t583->regmap, RC5T583_RTC_ADJ, 0);
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if (ret < 0) {
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dev_err(&pdev->dev, "unable to program rtc_adjust reg\n");
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return -EBUSY;
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}
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pmic_plat_data = dev_get_platdata(rc5t583->dev);
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irq = pmic_plat_data->irq_base;
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if (irq <= 0) {
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dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n",
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irq);
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return ret;
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}
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irq += RC5T583_IRQ_YALE;
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ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
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rc5t583_rtc_interrupt, IRQF_TRIGGER_LOW,
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"rtc-rc5t583", &pdev->dev);
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if (ret < 0) {
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dev_err(&pdev->dev, "IRQ is not free.\n");
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return ret;
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}
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device_init_wakeup(&pdev->dev, 1);
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ricoh_rtc->rtc = rtc_device_register(pdev->name, &pdev->dev,
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&rc5t583_rtc_ops, THIS_MODULE);
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if (IS_ERR(ricoh_rtc->rtc)) {
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ret = PTR_ERR(ricoh_rtc->rtc);
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dev_err(&pdev->dev, "RTC device register: err %d\n", 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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/*
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* Disable rc5t583 RTC interrupts.
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* Sets status flag to free.
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*/
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static int __devexit rc5t583_rtc_remove(struct platform_device *pdev)
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{
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struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(&pdev->dev);
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rc5t583_rtc_alarm_irq_enable(&rc5t583_rtc->rtc->dev, 0);
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rtc_device_unregister(rc5t583_rtc->rtc);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int rc5t583_rtc_suspend(struct device *dev)
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{
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
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struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev);
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int ret;
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/* Store current list of enabled interrupts*/
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ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL1,
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&rc5t583_rtc->irqen);
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return ret;
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}
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static int rc5t583_rtc_resume(struct device *dev)
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{
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struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
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struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev);
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/* Restore list of enabled interrupts before suspend */
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return regmap_write(rc5t583->regmap, RC5T583_RTC_CTL1,
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rc5t583_rtc->irqen);
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}
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static const struct dev_pm_ops rc5t583_rtc_pm_ops = {
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.suspend = rc5t583_rtc_suspend,
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.resume = rc5t583_rtc_resume,
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};
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#define DEV_PM_OPS (&rc5t583_rtc_pm_ops)
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#else
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#define DEV_PM_OPS NULL
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#endif
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static struct platform_driver rc5t583_rtc_driver = {
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.probe = rc5t583_rtc_probe,
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.remove = __devexit_p(rc5t583_rtc_remove),
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.driver = {
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.owner = THIS_MODULE,
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.name = "rtc-rc5t583",
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.pm = DEV_PM_OPS,
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},
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};
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module_platform_driver(rc5t583_rtc_driver);
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MODULE_ALIAS("platform:rtc-rc5t583");
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MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
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MODULE_LICENSE("GPL v2");
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