forked from Minki/linux
4802f224a5
The driver core clears the driver data to NULL after device_release or
on probe failure, since commit 0998d06310 ("device-core: Ensure drvdata
= NULL when no driver is bound"). Thus, it is not needed to manually
clear the device driver data to NULL.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
324 lines
7.7 KiB
C
324 lines
7.7 KiB
C
/*
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* RTC driver for Maxim MAX8998
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*
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* Copyright (C) 2010 Samsung Electronics Co.Ltd
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* Author: Minkyu Kang <mk7.kang@samsung.com>
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* Author: Joonyoung Shim <jy0922.shim@samsung.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 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/module.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/bcd.h>
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#include <linux/rtc.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/max8998.h>
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#include <linux/mfd/max8998-private.h>
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#include <linux/delay.h>
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#define MAX8998_RTC_SEC 0x00
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#define MAX8998_RTC_MIN 0x01
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#define MAX8998_RTC_HOUR 0x02
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#define MAX8998_RTC_WEEKDAY 0x03
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#define MAX8998_RTC_DATE 0x04
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#define MAX8998_RTC_MONTH 0x05
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#define MAX8998_RTC_YEAR1 0x06
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#define MAX8998_RTC_YEAR2 0x07
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#define MAX8998_ALARM0_SEC 0x08
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#define MAX8998_ALARM0_MIN 0x09
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#define MAX8998_ALARM0_HOUR 0x0a
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#define MAX8998_ALARM0_WEEKDAY 0x0b
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#define MAX8998_ALARM0_DATE 0x0c
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#define MAX8998_ALARM0_MONTH 0x0d
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#define MAX8998_ALARM0_YEAR1 0x0e
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#define MAX8998_ALARM0_YEAR2 0x0f
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#define MAX8998_ALARM1_SEC 0x10
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#define MAX8998_ALARM1_MIN 0x11
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#define MAX8998_ALARM1_HOUR 0x12
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#define MAX8998_ALARM1_WEEKDAY 0x13
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#define MAX8998_ALARM1_DATE 0x14
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#define MAX8998_ALARM1_MONTH 0x15
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#define MAX8998_ALARM1_YEAR1 0x16
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#define MAX8998_ALARM1_YEAR2 0x17
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#define MAX8998_ALARM0_CONF 0x18
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#define MAX8998_ALARM1_CONF 0x19
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#define MAX8998_RTC_STATUS 0x1a
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#define MAX8998_WTSR_SMPL_CNTL 0x1b
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#define MAX8998_TEST 0x1f
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#define HOUR_12 (1 << 7)
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#define HOUR_PM (1 << 5)
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#define ALARM0_STATUS (1 << 1)
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#define ALARM1_STATUS (1 << 2)
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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_DATE,
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RTC_MONTH,
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RTC_YEAR1,
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RTC_YEAR2,
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};
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struct max8998_rtc_info {
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struct device *dev;
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struct max8998_dev *max8998;
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struct i2c_client *rtc;
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struct rtc_device *rtc_dev;
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int irq;
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bool lp3974_bug_workaround;
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};
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static void max8998_data_to_tm(u8 *data, struct rtc_time *tm)
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{
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tm->tm_sec = bcd2bin(data[RTC_SEC]);
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tm->tm_min = bcd2bin(data[RTC_MIN]);
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if (data[RTC_HOUR] & HOUR_12) {
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tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f);
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if (data[RTC_HOUR] & HOUR_PM)
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tm->tm_hour += 12;
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} else
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tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);
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tm->tm_wday = data[RTC_WEEKDAY] & 0x07;
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tm->tm_mday = bcd2bin(data[RTC_DATE]);
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tm->tm_mon = bcd2bin(data[RTC_MONTH]);
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tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100;
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tm->tm_year -= 1900;
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}
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static void max8998_tm_to_data(struct rtc_time *tm, u8 *data)
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{
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data[RTC_SEC] = bin2bcd(tm->tm_sec);
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data[RTC_MIN] = bin2bcd(tm->tm_min);
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data[RTC_HOUR] = bin2bcd(tm->tm_hour);
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data[RTC_WEEKDAY] = tm->tm_wday;
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data[RTC_DATE] = bin2bcd(tm->tm_mday);
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data[RTC_MONTH] = bin2bcd(tm->tm_mon);
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data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100);
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data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100);
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}
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static int max8998_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct max8998_rtc_info *info = dev_get_drvdata(dev);
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u8 data[8];
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int ret;
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ret = max8998_bulk_read(info->rtc, MAX8998_RTC_SEC, 8, data);
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if (ret < 0)
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return ret;
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max8998_data_to_tm(data, tm);
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return rtc_valid_tm(tm);
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}
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static int max8998_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct max8998_rtc_info *info = dev_get_drvdata(dev);
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u8 data[8];
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int ret;
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max8998_tm_to_data(tm, data);
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ret = max8998_bulk_write(info->rtc, MAX8998_RTC_SEC, 8, data);
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if (info->lp3974_bug_workaround)
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msleep(2000);
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return ret;
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}
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static int max8998_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct max8998_rtc_info *info = dev_get_drvdata(dev);
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u8 data[8];
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u8 val;
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int ret;
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ret = max8998_bulk_read(info->rtc, MAX8998_ALARM0_SEC, 8, data);
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if (ret < 0)
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return ret;
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max8998_data_to_tm(data, &alrm->time);
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ret = max8998_read_reg(info->rtc, MAX8998_ALARM0_CONF, &val);
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if (ret < 0)
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return ret;
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alrm->enabled = !!val;
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ret = max8998_read_reg(info->rtc, MAX8998_RTC_STATUS, &val);
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if (ret < 0)
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return ret;
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if (val & ALARM0_STATUS)
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alrm->pending = 1;
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else
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alrm->pending = 0;
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return 0;
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}
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static int max8998_rtc_stop_alarm(struct max8998_rtc_info *info)
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{
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int ret = max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, 0);
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if (info->lp3974_bug_workaround)
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msleep(2000);
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return ret;
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}
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static int max8998_rtc_start_alarm(struct max8998_rtc_info *info)
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{
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int ret;
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u8 alarm0_conf = 0x77;
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/* LP3974 with delay bug chips has rtc alarm bugs with "MONTH" field */
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if (info->lp3974_bug_workaround)
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alarm0_conf = 0x57;
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ret = max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, alarm0_conf);
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if (info->lp3974_bug_workaround)
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msleep(2000);
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return ret;
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}
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static int max8998_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct max8998_rtc_info *info = dev_get_drvdata(dev);
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u8 data[8];
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int ret;
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max8998_tm_to_data(&alrm->time, data);
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ret = max8998_rtc_stop_alarm(info);
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if (ret < 0)
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return ret;
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ret = max8998_bulk_write(info->rtc, MAX8998_ALARM0_SEC, 8, data);
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if (ret < 0)
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return ret;
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if (info->lp3974_bug_workaround)
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msleep(2000);
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if (alrm->enabled)
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ret = max8998_rtc_start_alarm(info);
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return ret;
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}
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static int max8998_rtc_alarm_irq_enable(struct device *dev,
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unsigned int enabled)
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{
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struct max8998_rtc_info *info = dev_get_drvdata(dev);
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if (enabled)
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return max8998_rtc_start_alarm(info);
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else
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return max8998_rtc_stop_alarm(info);
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}
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static irqreturn_t max8998_rtc_alarm_irq(int irq, void *data)
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{
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struct max8998_rtc_info *info = data;
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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 max8998_rtc_ops = {
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.read_time = max8998_rtc_read_time,
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.set_time = max8998_rtc_set_time,
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.read_alarm = max8998_rtc_read_alarm,
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.set_alarm = max8998_rtc_set_alarm,
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.alarm_irq_enable = max8998_rtc_alarm_irq_enable,
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};
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static int max8998_rtc_probe(struct platform_device *pdev)
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{
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struct max8998_dev *max8998 = dev_get_drvdata(pdev->dev.parent);
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struct max8998_platform_data *pdata = dev_get_platdata(max8998->dev);
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struct max8998_rtc_info *info;
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int ret;
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info = devm_kzalloc(&pdev->dev, sizeof(struct max8998_rtc_info),
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GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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info->dev = &pdev->dev;
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info->max8998 = max8998;
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info->rtc = max8998->rtc;
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info->irq = max8998->irq_base + MAX8998_IRQ_ALARM0;
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platform_set_drvdata(pdev, info);
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info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8998-rtc",
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&max8998_rtc_ops, THIS_MODULE);
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if (IS_ERR(info->rtc_dev)) {
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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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return ret;
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}
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ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
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max8998_rtc_alarm_irq, 0, "rtc-alarm0", 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->irq, ret);
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dev_info(&pdev->dev, "RTC CHIP NAME: %s\n", pdev->id_entry->name);
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if (pdata && pdata->rtc_delay) {
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info->lp3974_bug_workaround = true;
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dev_warn(&pdev->dev, "LP3974 with RTC REGERR option."
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" RTC updates will be extremely slow.\n");
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}
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return 0;
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}
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static int max8998_rtc_remove(struct platform_device *pdev)
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{
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return 0;
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}
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static const struct platform_device_id max8998_rtc_id[] = {
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{ "max8998-rtc", TYPE_MAX8998 },
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{ "lp3974-rtc", TYPE_LP3974 },
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{ }
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};
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static struct platform_driver max8998_rtc_driver = {
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.driver = {
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.name = "max8998-rtc",
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.owner = THIS_MODULE,
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},
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.probe = max8998_rtc_probe,
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.remove = max8998_rtc_remove,
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.id_table = max8998_rtc_id,
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};
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module_platform_driver(max8998_rtc_driver);
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MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");
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MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
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MODULE_DESCRIPTION("Maxim MAX8998 RTC driver");
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MODULE_LICENSE("GPL");
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