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alistair23-linux/drivers/rtc/rtc-pcf50633.c
Lars-Peter Clausen 68d641efd8 mfd: Fix memleak in pcf50633_client_dev_register 
Since platform_device_add_data copies the passed data, the allocated
subdev_pdata is never freed. A simple fix would be to either free subdev_pdata
or put it onto the stack. But since the pcf50633 child devices can rely on
beeing children of the pcf50633 core device it's much more elegant to get access
to pcf50633 core structure through that link. This allows to get completly rid
of pcf5033_subdev_pdata.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2009-12-13 19:21:17 +01:00

344 lines
8.7 KiB
C
Raw Blame History

/* NXP PCF50633 RTC Driver
*
* (C) 2006-2008 by Openmoko, Inc.
* Author: Balaji Rao <balajirrao@openmoko.org>
* All rights reserved.
*
* Broken down from monstrous PCF50633 driver mainly by
* Harald Welte, Andy Green and Werner Almesberger
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/err.h>
#include <linux/mfd/pcf50633/core.h>
#define PCF50633_REG_RTCSC 0x59 /* Second */
#define PCF50633_REG_RTCMN 0x5a /* Minute */
#define PCF50633_REG_RTCHR 0x5b /* Hour */
#define PCF50633_REG_RTCWD 0x5c /* Weekday */
#define PCF50633_REG_RTCDT 0x5d /* Day */
#define PCF50633_REG_RTCMT 0x5e /* Month */
#define PCF50633_REG_RTCYR 0x5f /* Year */
#define PCF50633_REG_RTCSCA 0x60 /* Alarm Second */
#define PCF50633_REG_RTCMNA 0x61 /* Alarm Minute */
#define PCF50633_REG_RTCHRA 0x62 /* Alarm Hour */
#define PCF50633_REG_RTCWDA 0x63 /* Alarm Weekday */
#define PCF50633_REG_RTCDTA 0x64 /* Alarm Day */
#define PCF50633_REG_RTCMTA 0x65 /* Alarm Month */
#define PCF50633_REG_RTCYRA 0x66 /* Alarm Year */
enum pcf50633_time_indexes {
PCF50633_TI_SEC,
PCF50633_TI_MIN,
PCF50633_TI_HOUR,
PCF50633_TI_WKDAY,
PCF50633_TI_DAY,
PCF50633_TI_MONTH,
PCF50633_TI_YEAR,
PCF50633_TI_EXTENT /* always last */
};
struct pcf50633_time {
u_int8_t time[PCF50633_TI_EXTENT];
};
struct pcf50633_rtc {
int alarm_enabled;
int second_enabled;
struct pcf50633 *pcf;
struct rtc_device *rtc_dev;
};
static void pcf2rtc_time(struct rtc_time *rtc, struct pcf50633_time *pcf)
{
rtc->tm_sec = bcd2bin(pcf->time[PCF50633_TI_SEC]);
rtc->tm_min = bcd2bin(pcf->time[PCF50633_TI_MIN]);
rtc->tm_hour = bcd2bin(pcf->time[PCF50633_TI_HOUR]);
rtc->tm_wday = bcd2bin(pcf->time[PCF50633_TI_WKDAY]);
rtc->tm_mday = bcd2bin(pcf->time[PCF50633_TI_DAY]);
rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]) - 1;
rtc->tm_year = bcd2bin(pcf->time[PCF50633_TI_YEAR]) + 100;
}
static void rtc2pcf_time(struct pcf50633_time *pcf, struct rtc_time *rtc)
{
pcf->time[PCF50633_TI_SEC] = bin2bcd(rtc->tm_sec);
pcf->time[PCF50633_TI_MIN] = bin2bcd(rtc->tm_min);
pcf->time[PCF50633_TI_HOUR] = bin2bcd(rtc->tm_hour);
pcf->time[PCF50633_TI_WKDAY] = bin2bcd(rtc->tm_wday);
pcf->time[PCF50633_TI_DAY] = bin2bcd(rtc->tm_mday);
pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon + 1);
pcf->time[PCF50633_TI_YEAR] = bin2bcd(rtc->tm_year % 100);
}
static int
pcf50633_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct pcf50633_rtc *rtc = dev_get_drvdata(dev);
int err;
if (enabled)
err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
else
err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
if (err < 0)
return err;
rtc->alarm_enabled = enabled;
return 0;
}
static int
pcf50633_rtc_update_irq_enable(struct device *dev, unsigned int enabled)
{
struct pcf50633_rtc *rtc = dev_get_drvdata(dev);
int err;
if (enabled)
err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_SECOND);
else
err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_SECOND);
if (err < 0)
return err;
rtc->second_enabled = enabled;
return 0;
}
static int pcf50633_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct pcf50633_rtc *rtc;
struct pcf50633_time pcf_tm;
int ret;
rtc = dev_get_drvdata(dev);
ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSC,
PCF50633_TI_EXTENT,
&pcf_tm.time[0]);
if (ret != PCF50633_TI_EXTENT) {
dev_err(dev, "Failed to read time\n");
return -EIO;
}
dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
pcf_tm.time[PCF50633_TI_DAY],
pcf_tm.time[PCF50633_TI_MONTH],
pcf_tm.time[PCF50633_TI_YEAR],
pcf_tm.time[PCF50633_TI_HOUR],
pcf_tm.time[PCF50633_TI_MIN],
pcf_tm.time[PCF50633_TI_SEC]);
pcf2rtc_time(tm, &pcf_tm);
dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n",
tm->tm_mday, tm->tm_mon, tm->tm_year,
tm->tm_hour, tm->tm_min, tm->tm_sec);
return rtc_valid_tm(tm);
}
static int pcf50633_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct pcf50633_rtc *rtc;
struct pcf50633_time pcf_tm;
int second_masked, alarm_masked, ret = 0;
rtc = dev_get_drvdata(dev);
dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n",
tm->tm_mday, tm->tm_mon, tm->tm_year,
tm->tm_hour, tm->tm_min, tm->tm_sec);
rtc2pcf_time(&pcf_tm, tm);
dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
pcf_tm.time[PCF50633_TI_DAY],
pcf_tm.time[PCF50633_TI_MONTH],
pcf_tm.time[PCF50633_TI_YEAR],
pcf_tm.time[PCF50633_TI_HOUR],
pcf_tm.time[PCF50633_TI_MIN],
pcf_tm.time[PCF50633_TI_SEC]);
second_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_SECOND);
alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
if (!second_masked)
pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_SECOND);
if (!alarm_masked)
pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
/* Returns 0 on success */
ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSC,
PCF50633_TI_EXTENT,
&pcf_tm.time[0]);
if (!second_masked)
pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_SECOND);
if (!alarm_masked)
pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
return ret;
}
static int pcf50633_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct pcf50633_rtc *rtc;
struct pcf50633_time pcf_tm;
int ret = 0;
rtc = dev_get_drvdata(dev);
alrm->enabled = rtc->alarm_enabled;
ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSCA,
PCF50633_TI_EXTENT, &pcf_tm.time[0]);
if (ret != PCF50633_TI_EXTENT) {
dev_err(dev, "Failed to read time\n");
return -EIO;
}
pcf2rtc_time(&alrm->time, &pcf_tm);
return rtc_valid_tm(&alrm->time);
}
static int pcf50633_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct pcf50633_rtc *rtc;
struct pcf50633_time pcf_tm;
int alarm_masked, ret = 0;
rtc = dev_get_drvdata(dev);
rtc2pcf_time(&pcf_tm, &alrm->time);
/* do like mktime does and ignore tm_wday */
pcf_tm.time[PCF50633_TI_WKDAY] = 7;
alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
/* disable alarm interrupt */
if (!alarm_masked)
pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
/* Returns 0 on success */
ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSCA,
PCF50633_TI_EXTENT, &pcf_tm.time[0]);
if (!alarm_masked || alrm->enabled)
pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
rtc->alarm_enabled = alrm->enabled;
return ret;
}
static struct rtc_class_ops pcf50633_rtc_ops = {
.read_time = pcf50633_rtc_read_time,
.set_time = pcf50633_rtc_set_time,
.read_alarm = pcf50633_rtc_read_alarm,
.set_alarm = pcf50633_rtc_set_alarm,
.alarm_irq_enable = pcf50633_rtc_alarm_irq_enable,
.update_irq_enable = pcf50633_rtc_update_irq_enable,
};
static void pcf50633_rtc_irq(int irq, void *data)
{
struct pcf50633_rtc *rtc = data;
switch (irq) {
case PCF50633_IRQ_ALARM:
rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
break;
case PCF50633_IRQ_SECOND:
rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
break;
}
}
static int __devinit pcf50633_rtc_probe(struct platform_device *pdev)
{
struct pcf50633_rtc *rtc;
rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
if (!rtc)
return -ENOMEM;
rtc->pcf = dev_to_pcf50633(pdev->dev.parent);
platform_set_drvdata(pdev, rtc);
rtc->rtc_dev = rtc_device_register("pcf50633-rtc", &pdev->dev,
&pcf50633_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc->rtc_dev)) {
int ret = PTR_ERR(rtc->rtc_dev);
kfree(rtc);
return ret;
}
pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_ALARM,
pcf50633_rtc_irq, rtc);
pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_SECOND,
pcf50633_rtc_irq, rtc);
return 0;
}
static int __devexit pcf50633_rtc_remove(struct platform_device *pdev)
{
struct pcf50633_rtc *rtc;
rtc = platform_get_drvdata(pdev);
pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_ALARM);
pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_SECOND);
rtc_device_unregister(rtc->rtc_dev);
kfree(rtc);
return 0;
}
static struct platform_driver pcf50633_rtc_driver = {
.driver = {
.name = "pcf50633-rtc",
},
.probe = pcf50633_rtc_probe,
.remove = __devexit_p(pcf50633_rtc_remove),
};
static int __init pcf50633_rtc_init(void)
{
return platform_driver_register(&pcf50633_rtc_driver);
}
module_init(pcf50633_rtc_init);
static void __exit pcf50633_rtc_exit(void)
{
platform_driver_unregister(&pcf50633_rtc_driver);
}
module_exit(pcf50633_rtc_exit);
MODULE_DESCRIPTION("PCF50633 RTC driver");
MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
MODULE_LICENSE("GPL");
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