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Release 4.14 drivers/rtc/rtc-max8998.c

Directory: drivers/rtc
/*
 * RTC driver for Maxim MAX8998
 *
 * Copyright (C) 2010 Samsung Electronics Co.Ltd
 * Author: Minkyu Kang <mk7.kang@samsung.com>
 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/bcd.h>
#include <linux/irqdomain.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <linux/mfd/max8998.h>
#include <linux/mfd/max8998-private.h>
#include <linux/delay.h>


#define MAX8998_RTC_SEC			0x00

#define MAX8998_RTC_MIN			0x01

#define MAX8998_RTC_HOUR		0x02

#define MAX8998_RTC_WEEKDAY		0x03

#define MAX8998_RTC_DATE		0x04

#define MAX8998_RTC_MONTH		0x05

#define MAX8998_RTC_YEAR1		0x06

#define MAX8998_RTC_YEAR2		0x07

#define MAX8998_ALARM0_SEC		0x08

#define MAX8998_ALARM0_MIN		0x09

#define MAX8998_ALARM0_HOUR		0x0a

#define MAX8998_ALARM0_WEEKDAY		0x0b

#define MAX8998_ALARM0_DATE		0x0c

#define MAX8998_ALARM0_MONTH		0x0d

#define MAX8998_ALARM0_YEAR1		0x0e

#define MAX8998_ALARM0_YEAR2		0x0f

#define MAX8998_ALARM1_SEC		0x10

#define MAX8998_ALARM1_MIN		0x11

#define MAX8998_ALARM1_HOUR		0x12

#define MAX8998_ALARM1_WEEKDAY		0x13

#define MAX8998_ALARM1_DATE		0x14

#define MAX8998_ALARM1_MONTH		0x15

#define MAX8998_ALARM1_YEAR1		0x16

#define MAX8998_ALARM1_YEAR2		0x17

#define MAX8998_ALARM0_CONF		0x18

#define MAX8998_ALARM1_CONF		0x19

#define MAX8998_RTC_STATUS		0x1a

#define MAX8998_WTSR_SMPL_CNTL		0x1b

#define MAX8998_TEST			0x1f


#define HOUR_12				(1 << 7)

#define HOUR_PM				(1 << 5)

#define ALARM0_STATUS			(1 << 1)

#define ALARM1_STATUS			(1 << 2)

enum {
	
RTC_SEC = 0,
	
RTC_MIN,
	
RTC_HOUR,
	
RTC_WEEKDAY,
	
RTC_DATE,
	
RTC_MONTH,
	
RTC_YEAR1,
	
RTC_YEAR2,
};


struct max8998_rtc_info {
	
struct device		*dev;
	
struct max8998_dev	*max8998;
	
struct i2c_client	*rtc;
	
struct rtc_device	*rtc_dev;
	
int irq;
	
bool lp3974_bug_workaround;
};


static void max8998_data_to_tm(u8 *data, struct rtc_time *tm) { tm->tm_sec = bcd2bin(data[RTC_SEC]); tm->tm_min = bcd2bin(data[RTC_MIN]); if (data[RTC_HOUR] & HOUR_12) { tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f); if (data[RTC_HOUR] & HOUR_PM) tm->tm_hour += 12; } else tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f); tm->tm_wday = data[RTC_WEEKDAY] & 0x07; tm->tm_mday = bcd2bin(data[RTC_DATE]); tm->tm_mon = bcd2bin(data[RTC_MONTH]); tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100; tm->tm_year -= 1900; }

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Joonyoung Shim157100.00%1100.00%
Total157100.00%1100.00%


static void max8998_tm_to_data(struct rtc_time *tm, u8 *data) { data[RTC_SEC] = bin2bcd(tm->tm_sec); data[RTC_MIN] = bin2bcd(tm->tm_min); data[RTC_HOUR] = bin2bcd(tm->tm_hour); data[RTC_WEEKDAY] = tm->tm_wday; data[RTC_DATE] = bin2bcd(tm->tm_mday); data[RTC_MONTH] = bin2bcd(tm->tm_mon); data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100); data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100); }

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Joonyoung Shim116100.00%1100.00%
Total116100.00%1100.00%


static int max8998_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct max8998_rtc_info *info = dev_get_drvdata(dev); u8 data[8]; int ret; ret = max8998_bulk_read(info->rtc, MAX8998_RTC_SEC, 8, data); if (ret < 0) return ret; max8998_data_to_tm(data, tm); return rtc_valid_tm(tm); }

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Joonyoung Shim72100.00%1100.00%
Total72100.00%1100.00%


static int max8998_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct max8998_rtc_info *info = dev_get_drvdata(dev); u8 data[8]; int ret; max8998_tm_to_data(tm, data); ret = max8998_bulk_write(info->rtc, MAX8998_RTC_SEC, 8, data); if (info->lp3974_bug_workaround) msleep(2000); return ret; }

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Joonyoung Shim5273.24%150.00%
MyungJoo Ham1926.76%150.00%
Total71100.00%2100.00%


static int max8998_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) { struct max8998_rtc_info *info = dev_get_drvdata(dev); u8 data[8]; u8 val; int ret; ret = max8998_bulk_read(info->rtc, MAX8998_ALARM0_SEC, 8, data); if (ret < 0) return ret; max8998_data_to_tm(data, &alrm->time); ret = max8998_read_reg(info->rtc, MAX8998_ALARM0_CONF, &val); if (ret < 0) return ret; alrm->enabled = !!val; ret = max8998_read_reg(info->rtc, MAX8998_RTC_STATUS, &val); if (ret < 0) return ret; if (val & ALARM0_STATUS) alrm->pending = 1; else alrm->pending = 0; return 0; }

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Joonyoung Shim148100.00%1100.00%
Total148100.00%1100.00%


static int max8998_rtc_stop_alarm(struct max8998_rtc_info *info) { int ret = max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, 0); if (info->lp3974_bug_workaround) msleep(2000); return ret; }

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Joonyoung Shim2256.41%150.00%
MyungJoo Ham1743.59%150.00%
Total39100.00%2100.00%


static int max8998_rtc_start_alarm(struct max8998_rtc_info *info) { int ret; u8 alarm0_conf = 0x77; /* LP3974 with delay bug chips has rtc alarm bugs with "MONTH" field */ if (info->lp3974_bug_workaround) alarm0_conf = 0x57; ret = max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, alarm0_conf); if (info->lp3974_bug_workaround) msleep(2000); return ret; }

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MyungJoo Ham3663.16%150.00%
Joonyoung Shim2136.84%150.00%
Total57100.00%2100.00%


static int max8998_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) { struct max8998_rtc_info *info = dev_get_drvdata(dev); u8 data[8]; int ret; max8998_tm_to_data(&alrm->time, data); ret = max8998_rtc_stop_alarm(info); if (ret < 0) return ret; ret = max8998_bulk_write(info->rtc, MAX8998_ALARM0_SEC, 8, data); if (ret < 0) return ret; if (info->lp3974_bug_workaround) msleep(2000); if (alrm->enabled) ret = max8998_rtc_start_alarm(info); return ret; }

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Joonyoung Shim9786.61%150.00%
MyungJoo Ham1513.39%150.00%
Total112100.00%2100.00%


static int max8998_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) { struct max8998_rtc_info *info = dev_get_drvdata(dev); if (enabled) return max8998_rtc_start_alarm(info); else return max8998_rtc_stop_alarm(info); }

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Joonyoung Shim42100.00%1100.00%
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static irqreturn_t max8998_rtc_alarm_irq(int irq, void *data) { struct max8998_rtc_info *info = data; rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF); return IRQ_HANDLED; }

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Joonyoung Shim36100.00%1100.00%
Total36100.00%1100.00%

static const struct rtc_class_ops max8998_rtc_ops = { .read_time = max8998_rtc_read_time, .set_time = max8998_rtc_set_time, .read_alarm = max8998_rtc_read_alarm, .set_alarm = max8998_rtc_set_alarm, .alarm_irq_enable = max8998_rtc_alarm_irq_enable, };
static int max8998_rtc_probe(struct platform_device *pdev) { struct max8998_dev *max8998 = dev_get_drvdata(pdev->dev.parent); struct max8998_platform_data *pdata = max8998->pdata; struct max8998_rtc_info *info; int ret; info = devm_kzalloc(&pdev->dev, sizeof(struct max8998_rtc_info), GFP_KERNEL); if (!info) return -ENOMEM; info->dev = &pdev->dev; info->max8998 = max8998; info->rtc = max8998->rtc; platform_set_drvdata(pdev, info); info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8998-rtc", &max8998_rtc_ops, THIS_MODULE); if (IS_ERR(info->rtc_dev)) { ret = PTR_ERR(info->rtc_dev); dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); return ret; } if (!max8998->irq_domain) goto no_irq; info->irq = irq_create_mapping(max8998->irq_domain, MAX8998_IRQ_ALARM0); if (!info->irq) { dev_warn(&pdev->dev, "Failed to map alarm IRQ\n"); goto no_irq; } ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL, max8998_rtc_alarm_irq, 0, "rtc-alarm0", info); if (ret < 0) dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n", info->irq, ret); no_irq: dev_info(&pdev->dev, "RTC CHIP NAME: %s\n", pdev->id_entry->name); if (pdata && pdata->rtc_delay) { info->lp3974_bug_workaround = true; dev_warn(&pdev->dev, "LP3974 with RTC REGERR option." " RTC updates will be extremely slow.\n"); } return 0; }

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PersonTokensPropCommitsCommitProp
Joonyoung Shim16857.53%112.50%
Tomasz Figa5017.12%337.50%
MyungJoo Ham4916.78%112.50%
Jingoo Han186.16%225.00%
John Stultz72.40%112.50%
Total292100.00%8100.00%

static const struct platform_device_id max8998_rtc_id[] = { { "max8998-rtc", TYPE_MAX8998 }, { "lp3974-rtc", TYPE_LP3974 }, { } }; MODULE_DEVICE_TABLE(platform, max8998_rtc_id); static struct platform_driver max8998_rtc_driver = { .driver = { .name = "max8998-rtc", }, .probe = max8998_rtc_probe, .id_table = max8998_rtc_id, }; module_platform_driver(max8998_rtc_driver); MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>"); MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>"); MODULE_DESCRIPTION("Maxim MAX8998 RTC driver"); MODULE_LICENSE("GPL");

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PersonTokensPropCommitsCommitProp
Joonyoung Shim121882.74%110.00%
MyungJoo Ham16811.41%110.00%
Tomasz Figa533.60%330.00%
Jingoo Han181.22%220.00%
Axel Lin80.54%220.00%
John Stultz70.48%110.00%
Total1472100.00%10100.00%
Directory: drivers/rtc
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