mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 17:06:40 +07:00
2fa76062bb
Remove unnecessary goto statements to simplify the code. devm_request_threaded_irq returns 0 upon success, hence explicit return 0 is not necessary. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Cc: Chiwoong Byun <woong.byun@samsung.com> Cc: Jonghwa Lee <jonghwa3.lee@samsung.com> Cc: Laxman dewangan <ldewangan@nvidia.com> Cc: Venu Byravarasu <vbyravarasu@nvidia.com> Cc: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
233 lines
5.4 KiB
C
233 lines
5.4 KiB
C
/*
|
|
* RTC driver for Maxim MAX8907
|
|
*
|
|
* Copyright (c) 2011-2012, NVIDIA Corporation.
|
|
*
|
|
* Based on drivers/rtc/rtc-max8925.c,
|
|
* Copyright (C) 2009-2010 Marvell International Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/bcd.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/mfd/max8907.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/rtc.h>
|
|
#include <linux/slab.h>
|
|
|
|
enum {
|
|
RTC_SEC = 0,
|
|
RTC_MIN,
|
|
RTC_HOUR,
|
|
RTC_WEEKDAY,
|
|
RTC_DATE,
|
|
RTC_MONTH,
|
|
RTC_YEAR1,
|
|
RTC_YEAR2,
|
|
};
|
|
|
|
#define TIME_NUM 8
|
|
#define ALARM_1SEC (1 << 7)
|
|
#define HOUR_12 (1 << 7)
|
|
#define HOUR_AM_PM (1 << 5)
|
|
#define ALARM0_IRQ (1 << 3)
|
|
#define ALARM1_IRQ (1 << 2)
|
|
#define ALARM0_STATUS (1 << 2)
|
|
#define ALARM1_STATUS (1 << 1)
|
|
|
|
struct max8907_rtc {
|
|
struct max8907 *max8907;
|
|
struct regmap *regmap;
|
|
struct rtc_device *rtc_dev;
|
|
int irq;
|
|
};
|
|
|
|
static irqreturn_t max8907_irq_handler(int irq, void *data)
|
|
{
|
|
struct max8907_rtc *rtc = data;
|
|
|
|
regmap_update_bits(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0x7f, 0);
|
|
|
|
rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void regs_to_tm(u8 *regs, struct rtc_time *tm)
|
|
{
|
|
tm->tm_year = bcd2bin(regs[RTC_YEAR2]) * 100 +
|
|
bcd2bin(regs[RTC_YEAR1]) - 1900;
|
|
tm->tm_mon = bcd2bin(regs[RTC_MONTH] & 0x1f) - 1;
|
|
tm->tm_mday = bcd2bin(regs[RTC_DATE] & 0x3f);
|
|
tm->tm_wday = (regs[RTC_WEEKDAY] & 0x07) - 1;
|
|
if (regs[RTC_HOUR] & HOUR_12) {
|
|
tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x01f);
|
|
if (tm->tm_hour == 12)
|
|
tm->tm_hour = 0;
|
|
if (regs[RTC_HOUR] & HOUR_AM_PM)
|
|
tm->tm_hour += 12;
|
|
} else {
|
|
tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x03f);
|
|
}
|
|
tm->tm_min = bcd2bin(regs[RTC_MIN] & 0x7f);
|
|
tm->tm_sec = bcd2bin(regs[RTC_SEC] & 0x7f);
|
|
}
|
|
|
|
static void tm_to_regs(struct rtc_time *tm, u8 *regs)
|
|
{
|
|
u8 high, low;
|
|
|
|
high = (tm->tm_year + 1900) / 100;
|
|
low = tm->tm_year % 100;
|
|
regs[RTC_YEAR2] = bin2bcd(high);
|
|
regs[RTC_YEAR1] = bin2bcd(low);
|
|
regs[RTC_MONTH] = bin2bcd(tm->tm_mon + 1);
|
|
regs[RTC_DATE] = bin2bcd(tm->tm_mday);
|
|
regs[RTC_WEEKDAY] = tm->tm_wday + 1;
|
|
regs[RTC_HOUR] = bin2bcd(tm->tm_hour);
|
|
regs[RTC_MIN] = bin2bcd(tm->tm_min);
|
|
regs[RTC_SEC] = bin2bcd(tm->tm_sec);
|
|
}
|
|
|
|
static int max8907_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct max8907_rtc *rtc = dev_get_drvdata(dev);
|
|
u8 regs[TIME_NUM];
|
|
int ret;
|
|
|
|
ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_RTC_SEC, regs,
|
|
TIME_NUM);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
regs_to_tm(regs, tm);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max8907_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct max8907_rtc *rtc = dev_get_drvdata(dev);
|
|
u8 regs[TIME_NUM];
|
|
|
|
tm_to_regs(tm, regs);
|
|
|
|
return regmap_bulk_write(rtc->regmap, MAX8907_REG_RTC_SEC, regs,
|
|
TIME_NUM);
|
|
}
|
|
|
|
static int max8907_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
{
|
|
struct max8907_rtc *rtc = dev_get_drvdata(dev);
|
|
u8 regs[TIME_NUM];
|
|
unsigned int val;
|
|
int ret;
|
|
|
|
ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs,
|
|
TIME_NUM);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
regs_to_tm(regs, &alrm->time);
|
|
|
|
ret = regmap_read(rtc->regmap, MAX8907_REG_ALARM0_CNTL, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
alrm->enabled = !!(val & 0x7f);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max8907_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
{
|
|
struct max8907_rtc *rtc = dev_get_drvdata(dev);
|
|
u8 regs[TIME_NUM];
|
|
int ret;
|
|
|
|
tm_to_regs(&alrm->time, regs);
|
|
|
|
/* Disable alarm while we update the target time */
|
|
ret = regmap_update_bits(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0x7f, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = regmap_bulk_write(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs,
|
|
TIME_NUM);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (alrm->enabled)
|
|
ret = regmap_update_bits(rtc->regmap, MAX8907_REG_ALARM0_CNTL,
|
|
0x7f, 0x7f);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct rtc_class_ops max8907_rtc_ops = {
|
|
.read_time = max8907_rtc_read_time,
|
|
.set_time = max8907_rtc_set_time,
|
|
.read_alarm = max8907_rtc_read_alarm,
|
|
.set_alarm = max8907_rtc_set_alarm,
|
|
};
|
|
|
|
static int max8907_rtc_probe(struct platform_device *pdev)
|
|
{
|
|
struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent);
|
|
struct max8907_rtc *rtc;
|
|
int ret;
|
|
|
|
rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
|
|
if (!rtc)
|
|
return -ENOMEM;
|
|
platform_set_drvdata(pdev, rtc);
|
|
|
|
rtc->max8907 = max8907;
|
|
rtc->regmap = max8907->regmap_rtc;
|
|
|
|
rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8907-rtc",
|
|
&max8907_rtc_ops, THIS_MODULE);
|
|
if (IS_ERR(rtc->rtc_dev)) {
|
|
ret = PTR_ERR(rtc->rtc_dev);
|
|
dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
rtc->irq = regmap_irq_get_virq(max8907->irqc_rtc,
|
|
MAX8907_IRQ_RTC_ALARM0);
|
|
if (rtc->irq < 0)
|
|
return rtc->irq;
|
|
|
|
ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
|
|
max8907_irq_handler,
|
|
IRQF_ONESHOT, "max8907-alarm0", rtc);
|
|
if (ret < 0)
|
|
dev_err(&pdev->dev, "Failed to request IRQ%d: %d\n",
|
|
rtc->irq, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int max8907_rtc_remove(struct platform_device *pdev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver max8907_rtc_driver = {
|
|
.driver = {
|
|
.name = "max8907-rtc",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = max8907_rtc_probe,
|
|
.remove = max8907_rtc_remove,
|
|
};
|
|
module_platform_driver(max8907_rtc_driver);
|
|
|
|
MODULE_DESCRIPTION("Maxim MAX8907 RTC driver");
|
|
MODULE_LICENSE("GPL v2");
|