/* * 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> * * 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. */ #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); 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); 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 | IRQF_EARLY_RESUME, "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");