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path: root/drivers/rtc/rtc-m48t59.c
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Diffstat (limited to 'drivers/rtc/rtc-m48t59.c')
-rw-r--r--drivers/rtc/rtc-m48t59.c168
1 files changed, 61 insertions, 107 deletions
diff --git a/drivers/rtc/rtc-m48t59.c b/drivers/rtc/rtc-m48t59.c
index d99a705bec07..4e608bc8bbd3 100644
--- a/drivers/rtc/rtc-m48t59.c
+++ b/drivers/rtc/rtc-m48t59.c
@@ -1,13 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* ST M48T59 RTC driver
*
* Copyright (c) 2007 Wind River Systems, Inc.
*
* Author: Mark Zhan <rongkai.zhan@windriver.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
*/
#include <linux/kernel.h>
@@ -47,8 +44,7 @@ struct m48t59_private {
static void
m48t59_mem_writeb(struct device *dev, u32 ofs, u8 val)
{
- struct platform_device *pdev = to_platform_device(dev);
- struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
+ struct m48t59_private *m48t59 = dev_get_drvdata(dev);
writeb(val, m48t59->ioaddr+ofs);
}
@@ -56,8 +52,7 @@ m48t59_mem_writeb(struct device *dev, u32 ofs, u8 val)
static u8
m48t59_mem_readb(struct device *dev, u32 ofs)
{
- struct platform_device *pdev = to_platform_device(dev);
- struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
+ struct m48t59_private *m48t59 = dev_get_drvdata(dev);
return readb(m48t59->ioaddr+ofs);
}
@@ -67,9 +62,8 @@ m48t59_mem_readb(struct device *dev, u32 ofs)
*/
static int m48t59_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
- struct platform_device *pdev = to_platform_device(dev);
- struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
- struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
+ struct m48t59_plat_data *pdata = dev_get_platdata(dev);
+ struct m48t59_private *m48t59 = dev_get_drvdata(dev);
unsigned long flags;
u8 val;
@@ -77,7 +71,7 @@ static int m48t59_rtc_read_time(struct device *dev, struct rtc_time *tm)
/* Issue the READ command */
M48T59_SET_BITS(M48T59_CNTL_READ, M48T59_CNTL);
- tm->tm_year = bcd2bin(M48T59_READ(M48T59_YEAR));
+ tm->tm_year = bcd2bin(M48T59_READ(M48T59_YEAR)) + pdata->yy_offset;
/* tm_mon is 0-11 */
tm->tm_mon = bcd2bin(M48T59_READ(M48T59_MONTH)) - 1;
tm->tm_mday = bcd2bin(M48T59_READ(M48T59_MDAY));
@@ -88,10 +82,6 @@ static int m48t59_rtc_read_time(struct device *dev, struct rtc_time *tm)
dev_dbg(dev, "Century bit is enabled\n");
tm->tm_year += 100; /* one century */
}
-#ifdef CONFIG_SPARC
- /* Sun SPARC machines count years since 1968 */
- tm->tm_year += 68;
-#endif
tm->tm_wday = bcd2bin(val & 0x07);
tm->tm_hour = bcd2bin(M48T59_READ(M48T59_HOUR) & 0x3F);
@@ -102,25 +92,17 @@ static int m48t59_rtc_read_time(struct device *dev, struct rtc_time *tm)
M48T59_CLEAR_BITS(M48T59_CNTL_READ, M48T59_CNTL);
spin_unlock_irqrestore(&m48t59->lock, flags);
- dev_dbg(dev, "RTC read time %04d-%02d-%02d %02d/%02d/%02d\n",
- tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
- tm->tm_hour, tm->tm_min, tm->tm_sec);
- return rtc_valid_tm(tm);
+ dev_dbg(dev, "RTC read time %ptR\n", tm);
+ return 0;
}
static int m48t59_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
- struct platform_device *pdev = to_platform_device(dev);
- struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
- struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
+ struct m48t59_plat_data *pdata = dev_get_platdata(dev);
+ struct m48t59_private *m48t59 = dev_get_drvdata(dev);
unsigned long flags;
u8 val = 0;
- int year = tm->tm_year;
-
-#ifdef CONFIG_SPARC
- /* Sun SPARC machines count years since 1968 */
- year -= 68;
-#endif
+ int year = tm->tm_year - pdata->yy_offset;
dev_dbg(dev, "RTC set time %04d-%02d-%02d %02d/%02d/%02d\n",
year + 1900, tm->tm_mon, tm->tm_mday,
@@ -141,7 +123,7 @@ static int m48t59_rtc_set_time(struct device *dev, struct rtc_time *tm)
M48T59_WRITE((bin2bcd(tm->tm_mon + 1) & 0x1F), M48T59_MONTH);
M48T59_WRITE(bin2bcd(year % 100), M48T59_YEAR);
- if (pdata->type == M48T59RTC_TYPE_M48T59 && (year / 100))
+ if (pdata->type == M48T59RTC_TYPE_M48T59 && (year >= 100))
val = (M48T59_WDAY_CEB | M48T59_WDAY_CB);
val |= (bin2bcd(tm->tm_wday) & 0x07);
M48T59_WRITE(val, M48T59_WDAY);
@@ -157,9 +139,8 @@ static int m48t59_rtc_set_time(struct device *dev, struct rtc_time *tm)
*/
static int m48t59_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
- struct platform_device *pdev = to_platform_device(dev);
- struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
- struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
+ struct m48t59_plat_data *pdata = dev_get_platdata(dev);
+ struct m48t59_private *m48t59 = dev_get_drvdata(dev);
struct rtc_time *tm = &alrm->time;
unsigned long flags;
u8 val;
@@ -172,11 +153,7 @@ static int m48t59_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
/* Issue the READ command */
M48T59_SET_BITS(M48T59_CNTL_READ, M48T59_CNTL);
- tm->tm_year = bcd2bin(M48T59_READ(M48T59_YEAR));
-#ifdef CONFIG_SPARC
- /* Sun SPARC machines count years since 1968 */
- tm->tm_year += 68;
-#endif
+ tm->tm_year = bcd2bin(M48T59_READ(M48T59_YEAR)) + pdata->yy_offset;
/* tm_mon is 0-11 */
tm->tm_mon = bcd2bin(M48T59_READ(M48T59_MONTH)) - 1;
@@ -193,9 +170,7 @@ static int m48t59_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
M48T59_CLEAR_BITS(M48T59_CNTL_READ, M48T59_CNTL);
spin_unlock_irqrestore(&m48t59->lock, flags);
- dev_dbg(dev, "RTC read alarm time %04d-%02d-%02d %02d/%02d/%02d\n",
- tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
- tm->tm_hour, tm->tm_min, tm->tm_sec);
+ dev_dbg(dev, "RTC read alarm time %ptR\n", tm);
return rtc_valid_tm(tm);
}
@@ -204,18 +179,12 @@ static int m48t59_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
*/
static int m48t59_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
- struct platform_device *pdev = to_platform_device(dev);
- struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
- struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
+ struct m48t59_plat_data *pdata = dev_get_platdata(dev);
+ struct m48t59_private *m48t59 = dev_get_drvdata(dev);
struct rtc_time *tm = &alrm->time;
u8 mday, hour, min, sec;
unsigned long flags;
- int year = tm->tm_year;
-
-#ifdef CONFIG_SPARC
- /* Sun SPARC machines count years since 1968 */
- year -= 68;
-#endif
+ int year = tm->tm_year - pdata->yy_offset;
/* If no irq, we don't support ALARM */
if (m48t59->irq == NO_IRQ)
@@ -265,9 +234,8 @@ static int m48t59_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
*/
static int m48t59_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
- struct platform_device *pdev = to_platform_device(dev);
- struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
- struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
+ struct m48t59_plat_data *pdata = dev_get_platdata(dev);
+ struct m48t59_private *m48t59 = dev_get_drvdata(dev);
unsigned long flags;
spin_lock_irqsave(&m48t59->lock, flags);
@@ -282,9 +250,8 @@ static int m48t59_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
static int m48t59_rtc_proc(struct device *dev, struct seq_file *seq)
{
- struct platform_device *pdev = to_platform_device(dev);
- struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
- struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
+ struct m48t59_plat_data *pdata = dev_get_platdata(dev);
+ struct m48t59_private *m48t59 = dev_get_drvdata(dev);
unsigned long flags;
u8 val;
@@ -303,9 +270,8 @@ static int m48t59_rtc_proc(struct device *dev, struct seq_file *seq)
static irqreturn_t m48t59_rtc_interrupt(int irq, void *dev_id)
{
struct device *dev = (struct device *)dev_id;
- struct platform_device *pdev = to_platform_device(dev);
- struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
- struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
+ struct m48t59_plat_data *pdata = dev_get_platdata(dev);
+ struct m48t59_private *m48t59 = dev_get_drvdata(dev);
u8 event;
spin_lock(&m48t59->lock);
@@ -329,21 +295,16 @@ static const struct rtc_class_ops m48t59_rtc_ops = {
.alarm_irq_enable = m48t59_rtc_alarm_irq_enable,
};
-static const struct rtc_class_ops m48t02_rtc_ops = {
- .read_time = m48t59_rtc_read_time,
- .set_time = m48t59_rtc_set_time,
-};
-
-static ssize_t m48t59_nvram_read(struct file *filp, struct kobject *kobj,
- struct bin_attribute *bin_attr,
- char *buf, loff_t pos, size_t size)
+static int m48t59_nvram_read(void *priv, unsigned int offset, void *val,
+ size_t size)
{
- struct device *dev = container_of(kobj, struct device, kobj);
- struct platform_device *pdev = to_platform_device(dev);
+ struct platform_device *pdev = priv;
+ struct device *dev = &pdev->dev;
struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
ssize_t cnt = 0;
unsigned long flags;
+ u8 *buf = val;
spin_lock_irqsave(&m48t59->lock, flags);
@@ -352,19 +313,19 @@ static ssize_t m48t59_nvram_read(struct file *filp, struct kobject *kobj,
spin_unlock_irqrestore(&m48t59->lock, flags);
- return cnt;
+ return 0;
}
-static ssize_t m48t59_nvram_write(struct file *filp, struct kobject *kobj,
- struct bin_attribute *bin_attr,
- char *buf, loff_t pos, size_t size)
+static int m48t59_nvram_write(void *priv, unsigned int offset, void *val,
+ size_t size)
{
- struct device *dev = container_of(kobj, struct device, kobj);
- struct platform_device *pdev = to_platform_device(dev);
+ struct platform_device *pdev = priv;
+ struct device *dev = &pdev->dev;
struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
ssize_t cnt = 0;
unsigned long flags;
+ u8 *buf = val;
spin_lock_irqsave(&m48t59->lock, flags);
@@ -373,26 +334,23 @@ static ssize_t m48t59_nvram_write(struct file *filp, struct kobject *kobj,
spin_unlock_irqrestore(&m48t59->lock, flags);
- return cnt;
+ return 0;
}
-static struct bin_attribute m48t59_nvram_attr = {
- .attr = {
- .name = "nvram",
- .mode = S_IRUGO | S_IWUSR,
- },
- .read = m48t59_nvram_read,
- .write = m48t59_nvram_write,
-};
-
static int m48t59_rtc_probe(struct platform_device *pdev)
{
struct m48t59_plat_data *pdata = dev_get_platdata(&pdev->dev);
struct m48t59_private *m48t59 = NULL;
struct resource *res;
int ret = -ENOMEM;
- char *name;
- const struct rtc_class_ops *ops;
+ struct nvmem_config nvmem_cfg = {
+ .name = "m48t59-",
+ .word_size = 1,
+ .stride = 1,
+ .reg_read = m48t59_nvram_read,
+ .reg_write = m48t59_nvram_write,
+ .priv = pdev,
+ };
/* This chip could be memory-mapped or I/O-mapped */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -445,7 +403,7 @@ static int m48t59_rtc_probe(struct platform_device *pdev)
/* Try to get irq number. We also can work in
* the mode without IRQ.
*/
- m48t59->irq = platform_get_irq(pdev, 0);
+ m48t59->irq = platform_get_irq_optional(pdev, 0);
if (m48t59->irq <= 0)
m48t59->irq = NO_IRQ;
@@ -456,20 +414,21 @@ static int m48t59_rtc_probe(struct platform_device *pdev)
if (ret)
return ret;
}
+
+ m48t59->rtc = devm_rtc_allocate_device(&pdev->dev);
+ if (IS_ERR(m48t59->rtc))
+ return PTR_ERR(m48t59->rtc);
+
switch (pdata->type) {
case M48T59RTC_TYPE_M48T59:
- name = "m48t59";
- ops = &m48t59_rtc_ops;
pdata->offset = 0x1ff0;
break;
case M48T59RTC_TYPE_M48T02:
- name = "m48t02";
- ops = &m48t02_rtc_ops;
+ clear_bit(RTC_FEATURE_ALARM, m48t59->rtc->features);
pdata->offset = 0x7f0;
break;
case M48T59RTC_TYPE_M48T08:
- name = "m48t08";
- ops = &m48t02_rtc_ops;
+ clear_bit(RTC_FEATURE_ALARM, m48t59->rtc->features);
pdata->offset = 0x1ff0;
break;
default:
@@ -480,23 +439,19 @@ static int m48t59_rtc_probe(struct platform_device *pdev)
spin_lock_init(&m48t59->lock);
platform_set_drvdata(pdev, m48t59);
- m48t59->rtc = devm_rtc_device_register(&pdev->dev, name, ops,
- THIS_MODULE);
- if (IS_ERR(m48t59->rtc))
- return PTR_ERR(m48t59->rtc);
-
- m48t59_nvram_attr.size = pdata->offset;
+ m48t59->rtc->ops = &m48t59_rtc_ops;
+ m48t59->rtc->range_min = RTC_TIMESTAMP_BEGIN_1900;
+ m48t59->rtc->range_max = RTC_TIMESTAMP_END_2099;
- ret = sysfs_create_bin_file(&pdev->dev.kobj, &m48t59_nvram_attr);
+ nvmem_cfg.size = pdata->offset;
+ ret = devm_rtc_nvmem_register(m48t59->rtc, &nvmem_cfg);
if (ret)
return ret;
- return 0;
-}
+ ret = devm_rtc_register_device(m48t59->rtc);
+ if (ret)
+ return ret;
-static int m48t59_rtc_remove(struct platform_device *pdev)
-{
- sysfs_remove_bin_file(&pdev->dev.kobj, &m48t59_nvram_attr);
return 0;
}
@@ -508,7 +463,6 @@ static struct platform_driver m48t59_rtc_driver = {
.name = "rtc-m48t59",
},
.probe = m48t59_rtc_probe,
- .remove = m48t59_rtc_remove,
};
module_platform_driver(m48t59_rtc_driver);
generated by cgit (git 2.34.1) at 2025-12-25 12:52:44 +0000