606 lines
14 KiB
C
606 lines
14 KiB
C
/*
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* RTC driver for Maxim MAX77686
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*
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* Copyright (C) 2012 Samsung Electronics Co.Ltd
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*
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* based on rtc-max8997.c
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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 of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/slab.h>
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#include <linux/rtc.h>
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/max77686-private.h>
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#include <linux/irqdomain.h>
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#include <linux/regmap.h>
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/* RTC Control Register */
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#define BCD_EN_SHIFT 0
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#define BCD_EN_MASK (1 << BCD_EN_SHIFT)
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#define MODEL24_SHIFT 1
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#define MODEL24_MASK (1 << MODEL24_SHIFT)
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/* RTC Update Register1 */
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#define RTC_UDR_SHIFT 0
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#define RTC_UDR_MASK (1 << RTC_UDR_SHIFT)
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#define RTC_RBUDR_SHIFT 4
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#define RTC_RBUDR_MASK (1 << RTC_RBUDR_SHIFT)
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/* WTSR and SMPL Register */
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#define WTSRT_SHIFT 0
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#define SMPLT_SHIFT 2
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#define WTSR_EN_SHIFT 6
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#define SMPL_EN_SHIFT 7
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#define WTSRT_MASK (3 << WTSRT_SHIFT)
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#define SMPLT_MASK (3 << SMPLT_SHIFT)
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#define WTSR_EN_MASK (1 << WTSR_EN_SHIFT)
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#define SMPL_EN_MASK (1 << SMPL_EN_SHIFT)
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/* RTC Hour register */
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#define HOUR_PM_SHIFT 6
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#define HOUR_PM_MASK (1 << HOUR_PM_SHIFT)
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/* RTC Alarm Enable */
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#define ALARM_ENABLE_SHIFT 7
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#define ALARM_ENABLE_MASK (1 << ALARM_ENABLE_SHIFT)
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#define MAX77686_RTC_UPDATE_DELAY 16
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#undef MAX77686_RTC_WTSR_SMPL
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enum {
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RTC_SEC = 0,
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RTC_MIN,
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RTC_HOUR,
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RTC_WEEKDAY,
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RTC_MONTH,
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RTC_YEAR,
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RTC_DATE,
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RTC_NR_TIME
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};
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struct max77686_rtc_info {
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struct device *dev;
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struct max77686_dev *max77686;
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struct i2c_client *rtc;
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struct rtc_device *rtc_dev;
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struct mutex lock;
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struct regmap *regmap;
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int virq;
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int rtc_24hr_mode;
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};
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enum MAX77686_RTC_OP {
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MAX77686_RTC_WRITE,
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MAX77686_RTC_READ,
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};
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static inline int max77686_rtc_calculate_wday(u8 shifted)
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{
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int counter = -1;
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while (shifted) {
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shifted >>= 1;
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counter++;
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}
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return counter;
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}
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static void max77686_rtc_data_to_tm(u8 *data, struct rtc_time *tm,
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int rtc_24hr_mode)
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{
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tm->tm_sec = data[RTC_SEC] & 0x7f;
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tm->tm_min = data[RTC_MIN] & 0x7f;
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if (rtc_24hr_mode)
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tm->tm_hour = data[RTC_HOUR] & 0x1f;
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else {
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tm->tm_hour = data[RTC_HOUR] & 0x0f;
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if (data[RTC_HOUR] & HOUR_PM_MASK)
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tm->tm_hour += 12;
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}
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tm->tm_wday = max77686_rtc_calculate_wday(data[RTC_WEEKDAY] & 0x7f);
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tm->tm_mday = data[RTC_DATE] & 0x1f;
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tm->tm_mon = (data[RTC_MONTH] & 0x0f) - 1;
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tm->tm_year = (data[RTC_YEAR] & 0x7f) + 100;
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tm->tm_yday = 0;
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tm->tm_isdst = 0;
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}
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static int max77686_rtc_tm_to_data(struct rtc_time *tm, u8 *data)
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{
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data[RTC_SEC] = tm->tm_sec;
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data[RTC_MIN] = tm->tm_min;
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data[RTC_HOUR] = tm->tm_hour;
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data[RTC_WEEKDAY] = 1 << tm->tm_wday;
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data[RTC_DATE] = tm->tm_mday;
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data[RTC_MONTH] = tm->tm_mon + 1;
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data[RTC_YEAR] = tm->tm_year > 100 ? (tm->tm_year - 100) : 0;
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if (tm->tm_year < 100) {
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pr_warn("%s: MAX77686 RTC cannot handle the year %d."
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"Assume it's 2000.\n", __func__, 1900 + tm->tm_year);
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return -EINVAL;
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}
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return 0;
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}
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static int max77686_rtc_update(struct max77686_rtc_info *info,
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enum MAX77686_RTC_OP op)
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{
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int ret;
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unsigned int data;
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if (op == MAX77686_RTC_WRITE)
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data = 1 << RTC_UDR_SHIFT;
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else
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data = 1 << RTC_RBUDR_SHIFT;
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ret = regmap_update_bits(info->max77686->rtc_regmap,
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MAX77686_RTC_UPDATE0, data, data);
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if (ret < 0)
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dev_err(info->dev, "%s: fail to write update reg(ret=%d, data=0x%x)\n",
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__func__, ret, data);
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else {
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/* Minimum 16ms delay required before RTC update. */
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msleep(MAX77686_RTC_UPDATE_DELAY);
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}
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return ret;
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}
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static int max77686_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct max77686_rtc_info *info = dev_get_drvdata(dev);
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u8 data[RTC_NR_TIME];
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int ret;
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mutex_lock(&info->lock);
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ret = max77686_rtc_update(info, MAX77686_RTC_READ);
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if (ret < 0)
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goto out;
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ret = regmap_bulk_read(info->max77686->rtc_regmap,
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MAX77686_RTC_SEC, data, RTC_NR_TIME);
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if (ret < 0) {
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dev_err(info->dev, "%s: fail to read time reg(%d)\n", __func__, ret);
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goto out;
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}
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max77686_rtc_data_to_tm(data, tm, info->rtc_24hr_mode);
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ret = rtc_valid_tm(tm);
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out:
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mutex_unlock(&info->lock);
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return ret;
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}
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static int max77686_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct max77686_rtc_info *info = dev_get_drvdata(dev);
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u8 data[RTC_NR_TIME];
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int ret;
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ret = max77686_rtc_tm_to_data(tm, data);
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if (ret < 0)
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return ret;
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mutex_lock(&info->lock);
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ret = regmap_bulk_write(info->max77686->rtc_regmap,
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MAX77686_RTC_SEC, data, RTC_NR_TIME);
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if (ret < 0) {
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dev_err(info->dev, "%s: fail to write time reg(%d)\n", __func__,
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ret);
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goto out;
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}
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ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
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out:
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mutex_unlock(&info->lock);
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return ret;
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}
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static int max77686_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct max77686_rtc_info *info = dev_get_drvdata(dev);
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u8 data[RTC_NR_TIME];
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unsigned int val;
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int i, ret;
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mutex_lock(&info->lock);
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ret = max77686_rtc_update(info, MAX77686_RTC_READ);
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if (ret < 0)
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goto out;
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ret = regmap_bulk_read(info->max77686->rtc_regmap,
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MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
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if (ret < 0) {
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dev_err(info->dev, "%s:%d fail to read alarm reg(%d)\n",
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__func__, __LINE__, ret);
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goto out;
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}
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max77686_rtc_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
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alrm->enabled = 0;
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for (i = 0; i < RTC_NR_TIME; i++) {
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if (data[i] & ALARM_ENABLE_MASK) {
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alrm->enabled = 1;
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break;
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}
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}
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alrm->pending = 0;
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ret = regmap_read(info->max77686->regmap, MAX77686_REG_STATUS2, &val);
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if (ret < 0) {
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dev_err(info->dev, "%s:%d fail to read status2 reg(%d)\n",
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__func__, __LINE__, ret);
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goto out;
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}
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if (val & (1 << 4)) /* RTCA1 */
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alrm->pending = 1;
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out:
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mutex_unlock(&info->lock);
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return 0;
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}
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static int max77686_rtc_stop_alarm(struct max77686_rtc_info *info)
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{
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u8 data[RTC_NR_TIME];
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int ret, i;
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struct rtc_time tm;
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if (!mutex_is_locked(&info->lock))
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dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
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ret = max77686_rtc_update(info, MAX77686_RTC_READ);
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if (ret < 0)
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goto out;
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ret = regmap_bulk_read(info->max77686->rtc_regmap,
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MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
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if (ret < 0) {
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dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
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__func__, ret);
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goto out;
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}
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max77686_rtc_data_to_tm(data, &tm, info->rtc_24hr_mode);
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for (i = 0; i < RTC_NR_TIME; i++)
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data[i] &= ~ALARM_ENABLE_MASK;
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ret = regmap_bulk_write(info->max77686->rtc_regmap,
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MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
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if (ret < 0) {
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dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
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__func__, ret);
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goto out;
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}
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ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
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out:
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return ret;
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}
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static int max77686_rtc_start_alarm(struct max77686_rtc_info *info)
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{
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u8 data[RTC_NR_TIME];
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int ret;
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struct rtc_time tm;
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if (!mutex_is_locked(&info->lock))
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dev_warn(info->dev, "%s: should have mutex locked\n", __func__);
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ret = max77686_rtc_update(info, MAX77686_RTC_READ);
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if (ret < 0)
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goto out;
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ret = regmap_bulk_read(info->max77686->rtc_regmap,
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MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
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if (ret < 0) {
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dev_err(info->dev, "%s: fail to read alarm reg(%d)\n",
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__func__, ret);
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goto out;
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}
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max77686_rtc_data_to_tm(data, &tm, info->rtc_24hr_mode);
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data[RTC_SEC] |= (1 << ALARM_ENABLE_SHIFT);
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data[RTC_MIN] |= (1 << ALARM_ENABLE_SHIFT);
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data[RTC_HOUR] |= (1 << ALARM_ENABLE_SHIFT);
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data[RTC_WEEKDAY] &= ~ALARM_ENABLE_MASK;
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if (data[RTC_MONTH] & 0xf)
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data[RTC_MONTH] |= (1 << ALARM_ENABLE_SHIFT);
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if (data[RTC_YEAR] & 0x7f)
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data[RTC_YEAR] |= (1 << ALARM_ENABLE_SHIFT);
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if (data[RTC_DATE] & 0x1f)
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data[RTC_DATE] |= (1 << ALARM_ENABLE_SHIFT);
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ret = regmap_bulk_write(info->max77686->rtc_regmap,
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MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
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if (ret < 0) {
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dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
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__func__, ret);
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goto out;
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}
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ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
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out:
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return ret;
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}
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static int max77686_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct max77686_rtc_info *info = dev_get_drvdata(dev);
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u8 data[RTC_NR_TIME];
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int ret;
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ret = max77686_rtc_tm_to_data(&alrm->time, data);
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if (ret < 0)
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return ret;
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mutex_lock(&info->lock);
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ret = max77686_rtc_stop_alarm(info);
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if (ret < 0)
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goto out;
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ret = regmap_bulk_write(info->max77686->rtc_regmap,
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MAX77686_ALARM1_SEC, data, RTC_NR_TIME);
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if (ret < 0) {
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dev_err(info->dev, "%s: fail to write alarm reg(%d)\n",
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__func__, ret);
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goto out;
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}
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ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
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if (ret < 0)
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goto out;
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if (alrm->enabled)
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ret = max77686_rtc_start_alarm(info);
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out:
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mutex_unlock(&info->lock);
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return ret;
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}
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static int max77686_rtc_alarm_irq_enable(struct device *dev,
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unsigned int enabled)
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{
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struct max77686_rtc_info *info = dev_get_drvdata(dev);
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int ret;
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mutex_lock(&info->lock);
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if (enabled)
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ret = max77686_rtc_start_alarm(info);
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else
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ret = max77686_rtc_stop_alarm(info);
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mutex_unlock(&info->lock);
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return ret;
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}
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static irqreturn_t max77686_rtc_alarm_irq(int irq, void *data)
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{
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struct max77686_rtc_info *info = data;
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dev_info(info->dev, "%s:irq(%d)\n", __func__, irq);
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rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
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return IRQ_HANDLED;
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}
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static const struct rtc_class_ops max77686_rtc_ops = {
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.read_time = max77686_rtc_read_time,
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.set_time = max77686_rtc_set_time,
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.read_alarm = max77686_rtc_read_alarm,
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.set_alarm = max77686_rtc_set_alarm,
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.alarm_irq_enable = max77686_rtc_alarm_irq_enable,
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};
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#ifdef MAX77686_RTC_WTSR_SMPL
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static void max77686_rtc_enable_wtsr(struct max77686_rtc_info *info, bool enable)
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{
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int ret;
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unsigned int val, mask;
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if (enable)
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val = (1 << WTSR_EN_SHIFT) | (3 << WTSRT_SHIFT);
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else
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val = 0;
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mask = WTSR_EN_MASK | WTSRT_MASK;
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dev_info(info->dev, "%s: %s WTSR\n", __func__,
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enable ? "enable" : "disable");
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ret = regmap_update_bits(info->max77686->rtc_regmap,
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MAX77686_WTSR_SMPL_CNTL, mask, val);
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if (ret < 0) {
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dev_err(info->dev, "%s: fail to update WTSR reg(%d)\n",
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__func__, ret);
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return;
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}
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max77686_rtc_update(info, MAX77686_RTC_WRITE);
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}
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static void max77686_rtc_enable_smpl(struct max77686_rtc_info *info, bool enable)
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{
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int ret;
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unsigned int val, mask;
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if (enable)
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val = (1 << SMPL_EN_SHIFT) | (0 << SMPLT_SHIFT);
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else
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val = 0;
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mask = SMPL_EN_MASK | SMPLT_MASK;
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dev_info(info->dev, "%s: %s SMPL\n", __func__,
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enable ? "enable" : "disable");
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ret = regmap_update_bits(info->max77686->rtc_regmap,
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MAX77686_WTSR_SMPL_CNTL, mask, val);
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if (ret < 0) {
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dev_err(info->dev, "%s: fail to update SMPL reg(%d)\n",
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__func__, ret);
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return;
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}
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max77686_rtc_update(info, MAX77686_RTC_WRITE);
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val = 0;
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regmap_read(info->max77686->rtc_regmap, MAX77686_WTSR_SMPL_CNTL, &val);
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dev_info(info->dev, "%s: WTSR_SMPL(0x%02x)\n", __func__, val);
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}
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#endif /* MAX77686_RTC_WTSR_SMPL */
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static int max77686_rtc_init_reg(struct max77686_rtc_info *info)
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{
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u8 data[2];
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int ret;
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/* Set RTC control register : Binary mode, 24hour mdoe */
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data[0] = (1 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
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data[1] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
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info->rtc_24hr_mode = 1;
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ret = regmap_bulk_write(info->max77686->rtc_regmap, MAX77686_RTC_CONTROLM, data, 2);
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if (ret < 0) {
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dev_err(info->dev, "%s: fail to write controlm reg(%d)\n",
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__func__, ret);
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return ret;
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}
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ret = max77686_rtc_update(info, MAX77686_RTC_WRITE);
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return ret;
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}
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static int max77686_rtc_probe(struct platform_device *pdev)
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{
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struct max77686_dev *max77686 = dev_get_drvdata(pdev->dev.parent);
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struct max77686_rtc_info *info;
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int ret;
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dev_info(&pdev->dev, "%s\n", __func__);
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info = devm_kzalloc(&pdev->dev, sizeof(struct max77686_rtc_info),
|
|
GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&info->lock);
|
|
info->dev = &pdev->dev;
|
|
info->max77686 = max77686;
|
|
info->rtc = max77686->rtc;
|
|
|
|
platform_set_drvdata(pdev, info);
|
|
|
|
ret = max77686_rtc_init_reg(info);
|
|
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret);
|
|
goto err_rtc;
|
|
}
|
|
|
|
#ifdef MAX77686_RTC_WTSR_SMPL
|
|
max77686_rtc_enable_wtsr(info, true);
|
|
max77686_rtc_enable_smpl(info, true);
|
|
#endif
|
|
|
|
device_init_wakeup(&pdev->dev, 1);
|
|
|
|
info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max77686-rtc",
|
|
&max77686_rtc_ops, THIS_MODULE);
|
|
|
|
if (IS_ERR(info->rtc_dev)) {
|
|
dev_info(&pdev->dev, "%s: fail\n", __func__);
|
|
|
|
ret = PTR_ERR(info->rtc_dev);
|
|
dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
|
|
if (ret == 0)
|
|
ret = -EINVAL;
|
|
goto err_rtc;
|
|
}
|
|
|
|
info->virq = regmap_irq_get_virq(max77686->rtc_irq_data,
|
|
MAX77686_RTCIRQ_RTCA1);
|
|
if (!info->virq) {
|
|
ret = -ENXIO;
|
|
goto err_rtc;
|
|
}
|
|
|
|
ret = devm_request_threaded_irq(&pdev->dev, info->virq, NULL,
|
|
max77686_rtc_alarm_irq, 0, "rtc-alarm1", info);
|
|
if (ret < 0)
|
|
dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
|
|
info->virq, ret);
|
|
|
|
err_rtc:
|
|
return ret;
|
|
}
|
|
|
|
static void max77686_rtc_shutdown(struct platform_device *pdev)
|
|
{
|
|
#ifdef MAX77686_RTC_WTSR_SMPL
|
|
struct max77686_rtc_info *info = platform_get_drvdata(pdev);
|
|
int i;
|
|
u8 val = 0;
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
max77686_rtc_enable_wtsr(info, false);
|
|
regmap_read(info->max77686->rtc_regmap, MAX77686_WTSR_SMPL_CNTL, &val);
|
|
dev_info(info->dev, "%s: WTSR_SMPL reg(0x%02x)\n", __func__,
|
|
val);
|
|
if (val & WTSR_EN_MASK) {
|
|
dev_emerg(info->dev, "%s: fail to disable WTSR\n",
|
|
__func__);
|
|
} else {
|
|
dev_info(info->dev, "%s: success to disable WTSR\n",
|
|
__func__);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Disable SMPL when power off */
|
|
max77686_rtc_enable_smpl(info, false);
|
|
#endif /* MAX77686_RTC_WTSR_SMPL */
|
|
}
|
|
|
|
static const struct platform_device_id rtc_id[] = {
|
|
{ "max77686-rtc", 0 },
|
|
{},
|
|
};
|
|
|
|
static struct platform_driver max77686_rtc_driver = {
|
|
.driver = {
|
|
.name = "max77686-rtc",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = max77686_rtc_probe,
|
|
.shutdown = max77686_rtc_shutdown,
|
|
.id_table = rtc_id,
|
|
};
|
|
|
|
module_platform_driver(max77686_rtc_driver);
|
|
|
|
MODULE_DESCRIPTION("Maxim MAX77686 RTC driver");
|
|
MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
|
|
MODULE_LICENSE("GPL");
|