6b50fac5dd
The MAX77686 RTC chip has two features called SMPL (Sudden Momentary
Power Loss) and WTSR (Watchdog Timeout and Software Resets). Support
for these features seems to be implemented in the driver but compilation
is disabled using a C pre-processor conditional.
This code has been disabled since the driver was original merged in
commit fca1dd031a ("rtc: max77686: add Maxim 77686 driver").
So, since this code has never been built, let's just remove it.
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Doug Anderson <dianders@chromium.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Olof Johansson <olof@lixom.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
533 lines
12 KiB
C
533 lines
12 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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/* 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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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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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),
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GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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mutex_init(&info->lock);
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info->dev = &pdev->dev;
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info->max77686 = max77686;
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info->rtc = max77686->rtc;
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platform_set_drvdata(pdev, info);
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ret = max77686_rtc_init_reg(info);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to initialize RTC reg:%d\n", ret);
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goto err_rtc;
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}
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device_init_wakeup(&pdev->dev, 1);
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info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max77686-rtc",
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&max77686_rtc_ops, THIS_MODULE);
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if (IS_ERR(info->rtc_dev)) {
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dev_info(&pdev->dev, "%s: fail\n", __func__);
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ret = PTR_ERR(info->rtc_dev);
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dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
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if (ret == 0)
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ret = -EINVAL;
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goto err_rtc;
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}
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info->virq = regmap_irq_get_virq(max77686->rtc_irq_data,
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MAX77686_RTCIRQ_RTCA1);
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if (!info->virq) {
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ret = -ENXIO;
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goto err_rtc;
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}
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ret = devm_request_threaded_irq(&pdev->dev, info->virq, NULL,
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max77686_rtc_alarm_irq, 0, "rtc-alarm1", info);
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if (ret < 0)
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dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
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info->virq, ret);
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err_rtc:
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return ret;
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}
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#ifdef CONFIG_PM_SLEEP
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static int max77686_rtc_suspend(struct device *dev)
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{
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if (device_may_wakeup(dev)) {
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|
struct max77686_rtc_info *info = dev_get_drvdata(dev);
|
|
|
|
return enable_irq_wake(info->virq);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max77686_rtc_resume(struct device *dev)
|
|
{
|
|
if (device_may_wakeup(dev)) {
|
|
struct max77686_rtc_info *info = dev_get_drvdata(dev);
|
|
|
|
return disable_irq_wake(info->virq);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(max77686_rtc_pm_ops,
|
|
max77686_rtc_suspend, max77686_rtc_resume);
|
|
|
|
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,
|
|
.pm = &max77686_rtc_pm_ops,
|
|
},
|
|
.probe = max77686_rtc_probe,
|
|
.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");
|