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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221// SPDX-License-Identifier: GPL-2.0-only/* * RTC driver for Maxim MAX8907 * * Copyright (c) 2011-2012, NVIDIA Corporation. * * Based on drivers/rtc/rtc-max8925.c, * Copyright (C) 2009-2010 Marvell International Ltd. */
#include <linux/bcd.h>#include <linux/mfd/max8907.h>#include <linux/module.h>#include <linux/platform_device.h>#include <linux/regmap.h>#include <linux/rtc.h>#include <linux/slab.h>
enum { RTC_SEC = 0, RTC_MIN, RTC_HOUR, RTC_WEEKDAY, RTC_DATE, RTC_MONTH, RTC_YEAR1, RTC_YEAR2,};
#define TIME_NUM 8#define ALARM_1SEC (1 << 7)#define HOUR_12 (1 << 7)#define HOUR_AM_PM (1 << 5)#define ALARM0_IRQ (1 << 3)#define ALARM1_IRQ (1 << 2)#define ALARM0_STATUS (1 << 2)#define ALARM1_STATUS (1 << 1)
struct max8907_rtc { struct max8907 *max8907; struct regmap *regmap; struct rtc_device *rtc_dev; int irq;};
static irqreturn_t max8907_irq_handler(int irq, void *data){ struct max8907_rtc *rtc = data;
regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0);
rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
return IRQ_HANDLED;}
static void regs_to_tm(u8 *regs, struct rtc_time *tm){ tm->tm_year = bcd2bin(regs[RTC_YEAR2]) * 100 + bcd2bin(regs[RTC_YEAR1]) - 1900; tm->tm_mon = bcd2bin(regs[RTC_MONTH] & 0x1f) - 1; tm->tm_mday = bcd2bin(regs[RTC_DATE] & 0x3f); tm->tm_wday = (regs[RTC_WEEKDAY] & 0x07); if (regs[RTC_HOUR] & HOUR_12) { tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x01f); if (tm->tm_hour == 12) tm->tm_hour = 0; if (regs[RTC_HOUR] & HOUR_AM_PM) tm->tm_hour += 12; } else { tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x03f); } tm->tm_min = bcd2bin(regs[RTC_MIN] & 0x7f); tm->tm_sec = bcd2bin(regs[RTC_SEC] & 0x7f);}
static void tm_to_regs(struct rtc_time *tm, u8 *regs){ u8 high, low;
high = (tm->tm_year + 1900) / 100; low = tm->tm_year % 100; regs[RTC_YEAR2] = bin2bcd(high); regs[RTC_YEAR1] = bin2bcd(low); regs[RTC_MONTH] = bin2bcd(tm->tm_mon + 1); regs[RTC_DATE] = bin2bcd(tm->tm_mday); regs[RTC_WEEKDAY] = tm->tm_wday; regs[RTC_HOUR] = bin2bcd(tm->tm_hour); regs[RTC_MIN] = bin2bcd(tm->tm_min); regs[RTC_SEC] = bin2bcd(tm->tm_sec);}
static int max8907_rtc_read_time(struct device *dev, struct rtc_time *tm){ struct max8907_rtc *rtc = dev_get_drvdata(dev); u8 regs[TIME_NUM]; int ret;
ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_RTC_SEC, regs, TIME_NUM); if (ret < 0) return ret;
regs_to_tm(regs, tm);
return 0;}
static int max8907_rtc_set_time(struct device *dev, struct rtc_time *tm){ struct max8907_rtc *rtc = dev_get_drvdata(dev); u8 regs[TIME_NUM];
tm_to_regs(tm, regs);
return regmap_bulk_write(rtc->regmap, MAX8907_REG_RTC_SEC, regs, TIME_NUM);}
static int max8907_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm){ struct max8907_rtc *rtc = dev_get_drvdata(dev); u8 regs[TIME_NUM]; unsigned int val; int ret;
ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs, TIME_NUM); if (ret < 0) return ret;
regs_to_tm(regs, &alrm->time);
ret = regmap_read(rtc->regmap, MAX8907_REG_ALARM0_CNTL, &val); if (ret < 0) return ret;
alrm->enabled = !!(val & 0x7f);
return 0;}
static int max8907_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm){ struct max8907_rtc *rtc = dev_get_drvdata(dev); u8 regs[TIME_NUM]; int ret;
tm_to_regs(&alrm->time, regs);
/* Disable alarm while we update the target time */ ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0); if (ret < 0) return ret;
ret = regmap_bulk_write(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs, TIME_NUM); if (ret < 0) return ret;
if (alrm->enabled) ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0x77);
return ret;}
static const struct rtc_class_ops max8907_rtc_ops = { .read_time = max8907_rtc_read_time, .set_time = max8907_rtc_set_time, .read_alarm = max8907_rtc_read_alarm, .set_alarm = max8907_rtc_set_alarm,};
static int max8907_rtc_probe(struct platform_device *pdev){ struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent); struct max8907_rtc *rtc; int ret;
rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); if (!rtc) return -ENOMEM; platform_set_drvdata(pdev, rtc);
rtc->max8907 = max8907; rtc->regmap = max8907->regmap_rtc;
rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8907-rtc", &max8907_rtc_ops, THIS_MODULE); if (IS_ERR(rtc->rtc_dev)) { ret = PTR_ERR(rtc->rtc_dev); dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); return ret; }
rtc->irq = regmap_irq_get_virq(max8907->irqc_rtc, MAX8907_IRQ_RTC_ALARM0); if (rtc->irq < 0) return rtc->irq;
ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL, max8907_irq_handler, IRQF_ONESHOT, "max8907-alarm0", rtc); if (ret < 0) dev_err(&pdev->dev, "Failed to request IRQ%d: %d\n", rtc->irq, ret);
return ret;}
static struct platform_driver max8907_rtc_driver = { .driver = { .name = "max8907-rtc", }, .probe = max8907_rtc_probe,};module_platform_driver(max8907_rtc_driver);
MODULE_DESCRIPTION("Maxim MAX8907 RTC driver");MODULE_LICENSE("GPL v2");