mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Krzysztof Kozlowski](/assets/img/avatar_default.png)
Replace GPL v2.0+ license statements with SPDX license identifiers. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
321 lines
7.6 KiB
C
321 lines
7.6 KiB
C
// 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[] = {
|
|
{ "max8998-rtc", TYPE_MAX8998 },
|
|
{ "lp3974-rtc", 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");
|