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linux_kernel/drivers/rtc/rtc-rc5t583.c
Thomas Gleixner 9952f6918d treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms and conditions of the gnu general public license
  version 2 as published by the free software foundation this program
  is distributed in the hope it will be useful but without any
  warranty without even the implied warranty of merchantability or
  fitness for a particular purpose see the gnu general public license
  for more details you should have received a copy of the gnu general
  public license along with this program if not see http www gnu org
  licenses

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 228 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Steve Winslow <swinslow@gmail.com>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190528171438.107155473@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:29:52 -07:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* rtc-rc5t583.c -- RICOH RC5T583 Real Time Clock
*
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
* Author: Venu Byravarasu <vbyravarasu@nvidia.com>
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/mfd/rc5t583.h>
struct rc5t583_rtc {
struct rtc_device *rtc;
/* To store the list of enabled interrupts, during system suspend */
u32 irqen;
};
/* Total number of RTC registers needed to set time*/
#define NUM_TIME_REGS (RC5T583_RTC_YEAR - RC5T583_RTC_SEC + 1)
/* Total number of RTC registers needed to set Y-Alarm*/
#define NUM_YAL_REGS (RC5T583_RTC_AY_YEAR - RC5T583_RTC_AY_MIN + 1)
/* Set Y-Alarm interrupt */
#define SET_YAL BIT(5)
/* Get Y-Alarm interrupt status*/
#define GET_YAL_STATUS BIT(3)
static int rc5t583_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)
{
struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
u8 val;
/* Set Y-Alarm, based on 'enabled' */
val = enabled ? SET_YAL : 0;
return regmap_update_bits(rc5t583->regmap, RC5T583_RTC_CTL1, SET_YAL,
val);
}
/*
* Gets current rc5t583 RTC time and date parameters.
*
* The RTC's time/alarm representation is not what gmtime(3) requires
* Linux to use:
*
* - Months are 1..12 vs Linux 0-11
* - Years are 0..99 vs Linux 1900..N (we assume 21st century)
*/
static int rc5t583_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
u8 rtc_data[NUM_TIME_REGS];
int ret;
ret = regmap_bulk_read(rc5t583->regmap, RC5T583_RTC_SEC, rtc_data,
NUM_TIME_REGS);
if (ret < 0) {
dev_err(dev, "RTC read time failed with err:%d\n", ret);
return ret;
}
tm->tm_sec = bcd2bin(rtc_data[0]);
tm->tm_min = bcd2bin(rtc_data[1]);
tm->tm_hour = bcd2bin(rtc_data[2]);
tm->tm_wday = bcd2bin(rtc_data[3]);
tm->tm_mday = bcd2bin(rtc_data[4]);
tm->tm_mon = bcd2bin(rtc_data[5]) - 1;
tm->tm_year = bcd2bin(rtc_data[6]) + 100;
return ret;
}
static int rc5t583_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
unsigned char rtc_data[NUM_TIME_REGS];
int ret;
rtc_data[0] = bin2bcd(tm->tm_sec);
rtc_data[1] = bin2bcd(tm->tm_min);
rtc_data[2] = bin2bcd(tm->tm_hour);
rtc_data[3] = bin2bcd(tm->tm_wday);
rtc_data[4] = bin2bcd(tm->tm_mday);
rtc_data[5] = bin2bcd(tm->tm_mon + 1);
rtc_data[6] = bin2bcd(tm->tm_year - 100);
ret = regmap_bulk_write(rc5t583->regmap, RC5T583_RTC_SEC, rtc_data,
NUM_TIME_REGS);
if (ret < 0) {
dev_err(dev, "RTC set time failed with error %d\n", ret);
return ret;
}
return ret;
}
static int rc5t583_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
unsigned char alarm_data[NUM_YAL_REGS];
u32 interrupt_enable;
int ret;
ret = regmap_bulk_read(rc5t583->regmap, RC5T583_RTC_AY_MIN, alarm_data,
NUM_YAL_REGS);
if (ret < 0) {
dev_err(dev, "rtc_read_alarm error %d\n", ret);
return ret;
}
alm->time.tm_sec = 0;
alm->time.tm_min = bcd2bin(alarm_data[0]);
alm->time.tm_hour = bcd2bin(alarm_data[1]);
alm->time.tm_mday = bcd2bin(alarm_data[2]);
alm->time.tm_mon = bcd2bin(alarm_data[3]) - 1;
alm->time.tm_year = bcd2bin(alarm_data[4]) + 100;
ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL1, &interrupt_enable);
if (ret < 0)
return ret;
/* check if YALE is set */
if (interrupt_enable & SET_YAL)
alm->enabled = 1;
return ret;
}
static int rc5t583_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
unsigned char alarm_data[NUM_YAL_REGS];
int ret;
ret = rc5t583_rtc_alarm_irq_enable(dev, 0);
if (ret)
return ret;
alarm_data[0] = bin2bcd(alm->time.tm_min);
alarm_data[1] = bin2bcd(alm->time.tm_hour);
alarm_data[2] = bin2bcd(alm->time.tm_mday);
alarm_data[3] = bin2bcd(alm->time.tm_mon + 1);
alarm_data[4] = bin2bcd(alm->time.tm_year - 100);
ret = regmap_bulk_write(rc5t583->regmap, RC5T583_RTC_AY_MIN, alarm_data,
NUM_YAL_REGS);
if (ret) {
dev_err(dev, "rtc_set_alarm error %d\n", ret);
return ret;
}
if (alm->enabled)
ret = rc5t583_rtc_alarm_irq_enable(dev, 1);
return ret;
}
static irqreturn_t rc5t583_rtc_interrupt(int irq, void *rtc)
{
struct device *dev = rtc;
struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev);
unsigned long events = 0;
int ret;
u32 rtc_reg;
ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL2, &rtc_reg);
if (ret < 0)
return IRQ_NONE;
if (rtc_reg & GET_YAL_STATUS) {
events = RTC_IRQF | RTC_AF;
/* clear pending Y-alarm interrupt bit */
rtc_reg &= ~GET_YAL_STATUS;
}
ret = regmap_write(rc5t583->regmap, RC5T583_RTC_CTL2, rtc_reg);
if (ret)
return IRQ_NONE;
/* Notify RTC core on event */
rtc_update_irq(rc5t583_rtc->rtc, 1, events);
return IRQ_HANDLED;
}
static const struct rtc_class_ops rc5t583_rtc_ops = {
.read_time = rc5t583_rtc_read_time,
.set_time = rc5t583_rtc_set_time,
.read_alarm = rc5t583_rtc_read_alarm,
.set_alarm = rc5t583_rtc_set_alarm,
.alarm_irq_enable = rc5t583_rtc_alarm_irq_enable,
};
static int rc5t583_rtc_probe(struct platform_device *pdev)
{
struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
struct rc5t583_rtc *ricoh_rtc;
struct rc5t583_platform_data *pmic_plat_data;
int ret;
int irq;
ricoh_rtc = devm_kzalloc(&pdev->dev, sizeof(struct rc5t583_rtc),
GFP_KERNEL);
if (!ricoh_rtc)
return -ENOMEM;
platform_set_drvdata(pdev, ricoh_rtc);
/* Clear pending interrupts */
ret = regmap_write(rc5t583->regmap, RC5T583_RTC_CTL2, 0);
if (ret < 0)
return ret;
/* clear RTC Adjust register */
ret = regmap_write(rc5t583->regmap, RC5T583_RTC_ADJ, 0);
if (ret < 0) {
dev_err(&pdev->dev, "unable to program rtc_adjust reg\n");
return -EBUSY;
}
pmic_plat_data = dev_get_platdata(rc5t583->dev);
irq = pmic_plat_data->irq_base;
if (irq <= 0) {
dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n",
irq);
return ret;
}
irq += RC5T583_IRQ_YALE;
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
rc5t583_rtc_interrupt, IRQF_TRIGGER_LOW,
"rtc-rc5t583", &pdev->dev);
if (ret < 0) {
dev_err(&pdev->dev, "IRQ is not free.\n");
return ret;
}
device_init_wakeup(&pdev->dev, 1);
ricoh_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
&rc5t583_rtc_ops, THIS_MODULE);
if (IS_ERR(ricoh_rtc->rtc)) {
ret = PTR_ERR(ricoh_rtc->rtc);
dev_err(&pdev->dev, "RTC device register: err %d\n", ret);
return ret;
}
return 0;
}
/*
* Disable rc5t583 RTC interrupts.
* Sets status flag to free.
*/
static int rc5t583_rtc_remove(struct platform_device *pdev)
{
struct rc5t583_rtc *rc5t583_rtc = platform_get_drvdata(pdev);
rc5t583_rtc_alarm_irq_enable(&rc5t583_rtc->rtc->dev, 0);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int rc5t583_rtc_suspend(struct device *dev)
{
struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev);
int ret;
/* Store current list of enabled interrupts*/
ret = regmap_read(rc5t583->regmap, RC5T583_RTC_CTL1,
&rc5t583_rtc->irqen);
return ret;
}
static int rc5t583_rtc_resume(struct device *dev)
{
struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);
struct rc5t583_rtc *rc5t583_rtc = dev_get_drvdata(dev);
/* Restore list of enabled interrupts before suspend */
return regmap_write(rc5t583->regmap, RC5T583_RTC_CTL1,
rc5t583_rtc->irqen);
}
#endif
static SIMPLE_DEV_PM_OPS(rc5t583_rtc_pm_ops, rc5t583_rtc_suspend,
rc5t583_rtc_resume);
static struct platform_driver rc5t583_rtc_driver = {
.probe = rc5t583_rtc_probe,
.remove = rc5t583_rtc_remove,
.driver = {
.name = "rtc-rc5t583",
.pm = &rc5t583_rtc_pm_ops,
},
};
module_platform_driver(rc5t583_rtc_driver);
MODULE_ALIAS("platform:rtc-rc5t583");
MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
MODULE_LICENSE("GPL v2");
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