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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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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322// SPDX-License-Identifier: GPL-2.0+//// RTC driver for Maxim MAX8998//// Copyright (C) 2010 Samsung Electronics Co.Ltd// Author: Minkyu Kang <mk7.kang@samsung.com>// Author: Joonyoung Shim <jy0922.shim@samsung.com>
#include <linux/module.h>#include <linux/i2c.h>#include <linux/slab.h>#include <linux/bcd.h>#include <linux/irqdomain.h>#include <linux/rtc.h>#include <linux/platform_device.h>#include <linux/mfd/max8998.h>#include <linux/mfd/max8998-private.h>#include <linux/delay.h>
#define MAX8998_RTC_SEC 0x00#define MAX8998_RTC_MIN 0x01#define MAX8998_RTC_HOUR 0x02#define MAX8998_RTC_WEEKDAY 0x03#define MAX8998_RTC_DATE 0x04#define MAX8998_RTC_MONTH 0x05#define MAX8998_RTC_YEAR1 0x06#define MAX8998_RTC_YEAR2 0x07#define MAX8998_ALARM0_SEC 0x08#define MAX8998_ALARM0_MIN 0x09#define MAX8998_ALARM0_HOUR 0x0a#define MAX8998_ALARM0_WEEKDAY 0x0b#define MAX8998_ALARM0_DATE 0x0c#define MAX8998_ALARM0_MONTH 0x0d#define MAX8998_ALARM0_YEAR1 0x0e#define MAX8998_ALARM0_YEAR2 0x0f#define MAX8998_ALARM1_SEC 0x10#define MAX8998_ALARM1_MIN 0x11#define MAX8998_ALARM1_HOUR 0x12#define MAX8998_ALARM1_WEEKDAY 0x13#define MAX8998_ALARM1_DATE 0x14#define MAX8998_ALARM1_MONTH 0x15#define MAX8998_ALARM1_YEAR1 0x16#define MAX8998_ALARM1_YEAR2 0x17#define MAX8998_ALARM0_CONF 0x18#define MAX8998_ALARM1_CONF 0x19#define MAX8998_RTC_STATUS 0x1a#define MAX8998_WTSR_SMPL_CNTL 0x1b#define MAX8998_TEST 0x1f
#define HOUR_12 (1 << 7)#define HOUR_PM (1 << 5)#define ALARM0_STATUS (1 << 1)#define ALARM1_STATUS (1 << 2)
enum { RTC_SEC = 0, RTC_MIN, RTC_HOUR, RTC_WEEKDAY, RTC_DATE, RTC_MONTH, RTC_YEAR1, RTC_YEAR2,};
struct max8998_rtc_info { struct device *dev; struct max8998_dev *max8998; struct i2c_client *rtc; struct rtc_device *rtc_dev; int irq; bool lp3974_bug_workaround;};
static void max8998_data_to_tm(u8 *data, struct rtc_time *tm){ tm->tm_sec = bcd2bin(data[RTC_SEC]); tm->tm_min = bcd2bin(data[RTC_MIN]); if (data[RTC_HOUR] & HOUR_12) { tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x1f); if (data[RTC_HOUR] & HOUR_PM) tm->tm_hour += 12; } else tm->tm_hour = bcd2bin(data[RTC_HOUR] & 0x3f);
tm->tm_wday = data[RTC_WEEKDAY] & 0x07; tm->tm_mday = bcd2bin(data[RTC_DATE]); tm->tm_mon = bcd2bin(data[RTC_MONTH]); tm->tm_year = bcd2bin(data[RTC_YEAR1]) + bcd2bin(data[RTC_YEAR2]) * 100; tm->tm_year -= 1900;}
static void max8998_tm_to_data(struct rtc_time *tm, u8 *data){ data[RTC_SEC] = bin2bcd(tm->tm_sec); data[RTC_MIN] = bin2bcd(tm->tm_min); data[RTC_HOUR] = bin2bcd(tm->tm_hour); data[RTC_WEEKDAY] = tm->tm_wday; data[RTC_DATE] = bin2bcd(tm->tm_mday); data[RTC_MONTH] = bin2bcd(tm->tm_mon); data[RTC_YEAR1] = bin2bcd(tm->tm_year % 100); data[RTC_YEAR2] = bin2bcd((tm->tm_year + 1900) / 100);}
static int max8998_rtc_read_time(struct device *dev, struct rtc_time *tm){ struct max8998_rtc_info *info = dev_get_drvdata(dev); u8 data[8]; int ret;
ret = max8998_bulk_read(info->rtc, MAX8998_RTC_SEC, 8, data); if (ret < 0) return ret;
max8998_data_to_tm(data, tm);
return 0;}
static int max8998_rtc_set_time(struct device *dev, struct rtc_time *tm){ struct max8998_rtc_info *info = dev_get_drvdata(dev); u8 data[8]; int ret;
max8998_tm_to_data(tm, data);
ret = max8998_bulk_write(info->rtc, MAX8998_RTC_SEC, 8, data);
if (info->lp3974_bug_workaround) msleep(2000);
return ret;}
static int max8998_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm){ struct max8998_rtc_info *info = dev_get_drvdata(dev); u8 data[8]; u8 val; int ret;
ret = max8998_bulk_read(info->rtc, MAX8998_ALARM0_SEC, 8, data); if (ret < 0) return ret;
max8998_data_to_tm(data, &alrm->time);
ret = max8998_read_reg(info->rtc, MAX8998_ALARM0_CONF, &val); if (ret < 0) return ret;
alrm->enabled = !!val;
ret = max8998_read_reg(info->rtc, MAX8998_RTC_STATUS, &val); if (ret < 0) return ret;
if (val & ALARM0_STATUS) alrm->pending = 1; else alrm->pending = 0;
return 0;}
static int max8998_rtc_stop_alarm(struct max8998_rtc_info *info){ int ret = max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, 0);
if (info->lp3974_bug_workaround) msleep(2000);
return ret;}
static int max8998_rtc_start_alarm(struct max8998_rtc_info *info){ int ret; u8 alarm0_conf = 0x77;
/* LP3974 with delay bug chips has rtc alarm bugs with "MONTH" field */ if (info->lp3974_bug_workaround) alarm0_conf = 0x57;
ret = max8998_write_reg(info->rtc, MAX8998_ALARM0_CONF, alarm0_conf);
if (info->lp3974_bug_workaround) msleep(2000);
return ret;}
static int max8998_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm){ struct max8998_rtc_info *info = dev_get_drvdata(dev); u8 data[8]; int ret;
max8998_tm_to_data(&alrm->time, data);
ret = max8998_rtc_stop_alarm(info); if (ret < 0) return ret;
ret = max8998_bulk_write(info->rtc, MAX8998_ALARM0_SEC, 8, data); if (ret < 0) return ret;
if (info->lp3974_bug_workaround) msleep(2000);
if (alrm->enabled) ret = max8998_rtc_start_alarm(info);
return ret;}
static int max8998_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled){ struct max8998_rtc_info *info = dev_get_drvdata(dev);
if (enabled) return max8998_rtc_start_alarm(info); else return max8998_rtc_stop_alarm(info);}
static irqreturn_t max8998_rtc_alarm_irq(int irq, void *data){ struct max8998_rtc_info *info = data;
rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
return IRQ_HANDLED;}
static const struct rtc_class_ops max8998_rtc_ops = { .read_time = max8998_rtc_read_time, .set_time = max8998_rtc_set_time, .read_alarm = max8998_rtc_read_alarm, .set_alarm = max8998_rtc_set_alarm, .alarm_irq_enable = max8998_rtc_alarm_irq_enable,};
static int max8998_rtc_probe(struct platform_device *pdev){ struct max8998_dev *max8998 = dev_get_drvdata(pdev->dev.parent); struct max8998_platform_data *pdata = max8998->pdata; struct max8998_rtc_info *info; int ret;
info = devm_kzalloc(&pdev->dev, sizeof(struct max8998_rtc_info), GFP_KERNEL); if (!info) return -ENOMEM;
info->dev = &pdev->dev; info->max8998 = max8998; info->rtc = max8998->rtc;
platform_set_drvdata(pdev, info);
info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8998-rtc", &max8998_rtc_ops, THIS_MODULE);
if (IS_ERR(info->rtc_dev)) { ret = PTR_ERR(info->rtc_dev); dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret); return ret; }
if (!max8998->irq_domain) goto no_irq;
info->irq = irq_create_mapping(max8998->irq_domain, MAX8998_IRQ_ALARM0); if (!info->irq) { dev_warn(&pdev->dev, "Failed to map alarm IRQ\n"); goto no_irq; }
ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL, max8998_rtc_alarm_irq, 0, "rtc-alarm0", info);
if (ret < 0) dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n", info->irq, ret);
no_irq: dev_info(&pdev->dev, "RTC CHIP NAME: %s\n", pdev->id_entry->name); if (pdata && pdata->rtc_delay) { info->lp3974_bug_workaround = true; dev_warn(&pdev->dev, "LP3974 with RTC REGERR option." " RTC updates will be extremely slow.\n"); }
return 0;}
static const struct platform_device_id max8998_rtc_id[] = { { .name = "max8998-rtc", .driver_data = TYPE_MAX8998 }, { .name = "lp3974-rtc", .driver_data = TYPE_LP3974 }, { }};MODULE_DEVICE_TABLE(platform, max8998_rtc_id);
static struct platform_driver max8998_rtc_driver = { .driver = { .name = "max8998-rtc", }, .probe = max8998_rtc_probe, .id_table = max8998_rtc_id,};
module_platform_driver(max8998_rtc_driver);
MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");MODULE_DESCRIPTION("Maxim MAX8998 RTC driver");MODULE_LICENSE("GPL");