linux/drivers/rtc/rtc-as3722.c
Thomas Gleixner c942fddf87 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
Based on 3 normalized pattern(s):

  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 this program is distributed in the
  hope that 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

  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 [author] [kishon] [vijay] [abraham]
  [i] [kishon]@[ti] [com] this program is distributed in the hope that
  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

  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 [author] [graeme] [gregory]
  [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i]
  [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema]
  [hk] [hemahk]@[ti] [com] this program is distributed in the hope
  that 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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1105 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:37 -07:00

253 lines
6.6 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* rtc-as3722.c - Real Time Clock driver for ams AS3722 PMICs
*
* Copyright (C) 2013 ams AG
* Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
*
* Author: Florian Lobmaier <florian.lobmaier@ams.com>
* Author: Laxman Dewangan <ldewangan@nvidia.com>
*/
#include <linux/bcd.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/ioctl.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mfd/as3722.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/time.h>
#define AS3722_RTC_START_YEAR 2000
struct as3722_rtc {
struct rtc_device *rtc;
struct device *dev;
struct as3722 *as3722;
int alarm_irq;
bool irq_enable;
};
static void as3722_time_to_reg(u8 *rbuff, struct rtc_time *tm)
{
rbuff[0] = bin2bcd(tm->tm_sec);
rbuff[1] = bin2bcd(tm->tm_min);
rbuff[2] = bin2bcd(tm->tm_hour);
rbuff[3] = bin2bcd(tm->tm_mday);
rbuff[4] = bin2bcd(tm->tm_mon + 1);
rbuff[5] = bin2bcd(tm->tm_year - (AS3722_RTC_START_YEAR - 1900));
}
static void as3722_reg_to_time(u8 *rbuff, struct rtc_time *tm)
{
tm->tm_sec = bcd2bin(rbuff[0] & 0x7F);
tm->tm_min = bcd2bin(rbuff[1] & 0x7F);
tm->tm_hour = bcd2bin(rbuff[2] & 0x3F);
tm->tm_mday = bcd2bin(rbuff[3] & 0x3F);
tm->tm_mon = bcd2bin(rbuff[4] & 0x1F) - 1;
tm->tm_year = (AS3722_RTC_START_YEAR - 1900) + bcd2bin(rbuff[5] & 0x7F);
return;
}
static int as3722_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
struct as3722 *as3722 = as3722_rtc->as3722;
u8 as_time_array[6];
int ret;
ret = as3722_block_read(as3722, AS3722_RTC_SECOND_REG,
6, as_time_array);
if (ret < 0) {
dev_err(dev, "RTC_SECOND reg block read failed %d\n", ret);
return ret;
}
as3722_reg_to_time(as_time_array, tm);
return 0;
}
static int as3722_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
struct as3722 *as3722 = as3722_rtc->as3722;
u8 as_time_array[6];
int ret;
if (tm->tm_year < (AS3722_RTC_START_YEAR - 1900))
return -EINVAL;
as3722_time_to_reg(as_time_array, tm);
ret = as3722_block_write(as3722, AS3722_RTC_SECOND_REG, 6,
as_time_array);
if (ret < 0)
dev_err(dev, "RTC_SECOND reg block write failed %d\n", ret);
return ret;
}
static int as3722_rtc_alarm_irq_enable(struct device *dev,
unsigned int enabled)
{
struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
if (enabled && !as3722_rtc->irq_enable) {
enable_irq(as3722_rtc->alarm_irq);
as3722_rtc->irq_enable = true;
} else if (!enabled && as3722_rtc->irq_enable) {
disable_irq(as3722_rtc->alarm_irq);
as3722_rtc->irq_enable = false;
}
return 0;
}
static int as3722_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
struct as3722 *as3722 = as3722_rtc->as3722;
u8 as_time_array[6];
int ret;
ret = as3722_block_read(as3722, AS3722_RTC_ALARM_SECOND_REG, 6,
as_time_array);
if (ret < 0) {
dev_err(dev, "RTC_ALARM_SECOND block read failed %d\n", ret);
return ret;
}
as3722_reg_to_time(as_time_array, &alrm->time);
return 0;
}
static int as3722_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
struct as3722 *as3722 = as3722_rtc->as3722;
u8 as_time_array[6];
int ret;
if (alrm->time.tm_year < (AS3722_RTC_START_YEAR - 1900))
return -EINVAL;
ret = as3722_rtc_alarm_irq_enable(dev, 0);
if (ret < 0) {
dev_err(dev, "Disable RTC alarm failed\n");
return ret;
}
as3722_time_to_reg(as_time_array, &alrm->time);
ret = as3722_block_write(as3722, AS3722_RTC_ALARM_SECOND_REG, 6,
as_time_array);
if (ret < 0) {
dev_err(dev, "RTC_ALARM_SECOND block write failed %d\n", ret);
return ret;
}
if (alrm->enabled)
ret = as3722_rtc_alarm_irq_enable(dev, alrm->enabled);
return ret;
}
static irqreturn_t as3722_alarm_irq(int irq, void *data)
{
struct as3722_rtc *as3722_rtc = data;
rtc_update_irq(as3722_rtc->rtc, 1, RTC_IRQF | RTC_AF);
return IRQ_HANDLED;
}
static const struct rtc_class_ops as3722_rtc_ops = {
.read_time = as3722_rtc_read_time,
.set_time = as3722_rtc_set_time,
.read_alarm = as3722_rtc_read_alarm,
.set_alarm = as3722_rtc_set_alarm,
.alarm_irq_enable = as3722_rtc_alarm_irq_enable,
};
static int as3722_rtc_probe(struct platform_device *pdev)
{
struct as3722 *as3722 = dev_get_drvdata(pdev->dev.parent);
struct as3722_rtc *as3722_rtc;
int ret;
as3722_rtc = devm_kzalloc(&pdev->dev, sizeof(*as3722_rtc), GFP_KERNEL);
if (!as3722_rtc)
return -ENOMEM;
as3722_rtc->as3722 = as3722;
as3722_rtc->dev = &pdev->dev;
platform_set_drvdata(pdev, as3722_rtc);
/* Enable the RTC to make sure it is running. */
ret = as3722_update_bits(as3722, AS3722_RTC_CONTROL_REG,
AS3722_RTC_ON | AS3722_RTC_ALARM_WAKEUP_EN,
AS3722_RTC_ON | AS3722_RTC_ALARM_WAKEUP_EN);
if (ret < 0) {
dev_err(&pdev->dev, "RTC_CONTROL reg write failed: %d\n", ret);
return ret;
}
device_init_wakeup(&pdev->dev, 1);
as3722_rtc->rtc = devm_rtc_device_register(&pdev->dev, "as3722-rtc",
&as3722_rtc_ops, THIS_MODULE);
if (IS_ERR(as3722_rtc->rtc)) {
ret = PTR_ERR(as3722_rtc->rtc);
dev_err(&pdev->dev, "RTC register failed: %d\n", ret);
return ret;
}
as3722_rtc->alarm_irq = platform_get_irq(pdev, 0);
dev_info(&pdev->dev, "RTC interrupt %d\n", as3722_rtc->alarm_irq);
ret = devm_request_threaded_irq(&pdev->dev, as3722_rtc->alarm_irq, NULL,
as3722_alarm_irq, IRQF_ONESHOT,
"rtc-alarm", as3722_rtc);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to request alarm IRQ %d: %d\n",
as3722_rtc->alarm_irq, ret);
return ret;
}
disable_irq(as3722_rtc->alarm_irq);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int as3722_rtc_suspend(struct device *dev)
{
struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
enable_irq_wake(as3722_rtc->alarm_irq);
return 0;
}
static int as3722_rtc_resume(struct device *dev)
{
struct as3722_rtc *as3722_rtc = dev_get_drvdata(dev);
if (device_may_wakeup(dev))
disable_irq_wake(as3722_rtc->alarm_irq);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(as3722_rtc_pm_ops, as3722_rtc_suspend,
as3722_rtc_resume);
static struct platform_driver as3722_rtc_driver = {
.probe = as3722_rtc_probe,
.driver = {
.name = "as3722-rtc",
.pm = &as3722_rtc_pm_ops,
},
};
module_platform_driver(as3722_rtc_driver);
MODULE_DESCRIPTION("RTC driver for AS3722 PMICs");
MODULE_ALIAS("platform:as3722-rtc");
MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@ams.com>");
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
MODULE_LICENSE("GPL");