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![Wolfram Sang](/assets/img/avatar_default.png)
A platform_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
224 lines
5.2 KiB
C
224 lines
5.2 KiB
C
/*
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* RTC driver for Maxim MAX8907
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*
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* Copyright (c) 2011-2012, NVIDIA Corporation.
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*
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* Based on drivers/rtc/rtc-max8925.c,
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* Copyright (C) 2009-2010 Marvell International Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/bcd.h>
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#include <linux/i2c.h>
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#include <linux/mfd/max8907.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/rtc.h>
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#include <linux/slab.h>
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enum {
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RTC_SEC = 0,
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RTC_MIN,
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RTC_HOUR,
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RTC_WEEKDAY,
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RTC_DATE,
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RTC_MONTH,
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RTC_YEAR1,
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RTC_YEAR2,
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};
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#define TIME_NUM 8
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#define ALARM_1SEC (1 << 7)
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#define HOUR_12 (1 << 7)
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#define HOUR_AM_PM (1 << 5)
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#define ALARM0_IRQ (1 << 3)
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#define ALARM1_IRQ (1 << 2)
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#define ALARM0_STATUS (1 << 2)
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#define ALARM1_STATUS (1 << 1)
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struct max8907_rtc {
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struct max8907 *max8907;
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struct regmap *regmap;
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struct rtc_device *rtc_dev;
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int irq;
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};
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static irqreturn_t max8907_irq_handler(int irq, void *data)
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{
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struct max8907_rtc *rtc = data;
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regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0);
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rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
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return IRQ_HANDLED;
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}
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static void regs_to_tm(u8 *regs, struct rtc_time *tm)
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{
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tm->tm_year = bcd2bin(regs[RTC_YEAR2]) * 100 +
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bcd2bin(regs[RTC_YEAR1]) - 1900;
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tm->tm_mon = bcd2bin(regs[RTC_MONTH] & 0x1f) - 1;
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tm->tm_mday = bcd2bin(regs[RTC_DATE] & 0x3f);
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tm->tm_wday = (regs[RTC_WEEKDAY] & 0x07);
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if (regs[RTC_HOUR] & HOUR_12) {
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tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x01f);
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if (tm->tm_hour == 12)
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tm->tm_hour = 0;
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if (regs[RTC_HOUR] & HOUR_AM_PM)
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tm->tm_hour += 12;
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} else {
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tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x03f);
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}
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tm->tm_min = bcd2bin(regs[RTC_MIN] & 0x7f);
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tm->tm_sec = bcd2bin(regs[RTC_SEC] & 0x7f);
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}
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static void tm_to_regs(struct rtc_time *tm, u8 *regs)
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{
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u8 high, low;
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high = (tm->tm_year + 1900) / 100;
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low = tm->tm_year % 100;
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regs[RTC_YEAR2] = bin2bcd(high);
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regs[RTC_YEAR1] = bin2bcd(low);
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regs[RTC_MONTH] = bin2bcd(tm->tm_mon + 1);
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regs[RTC_DATE] = bin2bcd(tm->tm_mday);
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regs[RTC_WEEKDAY] = tm->tm_wday;
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regs[RTC_HOUR] = bin2bcd(tm->tm_hour);
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regs[RTC_MIN] = bin2bcd(tm->tm_min);
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regs[RTC_SEC] = bin2bcd(tm->tm_sec);
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}
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static int max8907_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct max8907_rtc *rtc = dev_get_drvdata(dev);
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u8 regs[TIME_NUM];
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int ret;
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ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_RTC_SEC, regs,
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TIME_NUM);
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if (ret < 0)
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return ret;
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regs_to_tm(regs, tm);
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return 0;
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}
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static int max8907_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct max8907_rtc *rtc = dev_get_drvdata(dev);
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u8 regs[TIME_NUM];
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tm_to_regs(tm, regs);
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return regmap_bulk_write(rtc->regmap, MAX8907_REG_RTC_SEC, regs,
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TIME_NUM);
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}
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static int max8907_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct max8907_rtc *rtc = dev_get_drvdata(dev);
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u8 regs[TIME_NUM];
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unsigned int val;
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int ret;
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ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs,
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TIME_NUM);
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if (ret < 0)
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return ret;
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regs_to_tm(regs, &alrm->time);
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ret = regmap_read(rtc->regmap, MAX8907_REG_ALARM0_CNTL, &val);
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if (ret < 0)
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return ret;
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alrm->enabled = !!(val & 0x7f);
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return 0;
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}
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static int max8907_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct max8907_rtc *rtc = dev_get_drvdata(dev);
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u8 regs[TIME_NUM];
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int ret;
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tm_to_regs(&alrm->time, regs);
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/* Disable alarm while we update the target time */
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ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0);
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if (ret < 0)
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return ret;
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ret = regmap_bulk_write(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs,
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TIME_NUM);
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if (ret < 0)
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return ret;
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if (alrm->enabled)
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ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0x77);
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return ret;
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}
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static const struct rtc_class_ops max8907_rtc_ops = {
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.read_time = max8907_rtc_read_time,
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.set_time = max8907_rtc_set_time,
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.read_alarm = max8907_rtc_read_alarm,
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.set_alarm = max8907_rtc_set_alarm,
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};
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static int max8907_rtc_probe(struct platform_device *pdev)
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{
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struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent);
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struct max8907_rtc *rtc;
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int ret;
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rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
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if (!rtc)
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return -ENOMEM;
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platform_set_drvdata(pdev, rtc);
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rtc->max8907 = max8907;
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rtc->regmap = max8907->regmap_rtc;
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rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8907-rtc",
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&max8907_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc->rtc_dev)) {
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ret = PTR_ERR(rtc->rtc_dev);
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dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
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return ret;
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}
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rtc->irq = regmap_irq_get_virq(max8907->irqc_rtc,
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MAX8907_IRQ_RTC_ALARM0);
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if (rtc->irq < 0)
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return rtc->irq;
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ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
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max8907_irq_handler,
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IRQF_ONESHOT, "max8907-alarm0", rtc);
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if (ret < 0)
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dev_err(&pdev->dev, "Failed to request IRQ%d: %d\n",
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rtc->irq, ret);
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return ret;
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}
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static struct platform_driver max8907_rtc_driver = {
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.driver = {
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.name = "max8907-rtc",
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},
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.probe = max8907_rtc_probe,
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};
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module_platform_driver(max8907_rtc_driver);
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MODULE_DESCRIPTION("Maxim MAX8907 RTC driver");
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MODULE_LICENSE("GPL v2");
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