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