linux/drivers/rtc/rtc-max8925.c

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/*
* RTC driver for Maxim MAX8925
*
* Copyright (C) 2009-2010 Marvell International Ltd.
* Haojian Zhuang <haojian.zhuang@marvell.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/module.h>
#include <linux/i2c.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#include <linux/slab.h>
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <linux/mfd/max8925.h>
enum {
RTC_SEC = 0,
RTC_MIN,
RTC_HOUR,
RTC_WEEKDAY,
RTC_DATE,
RTC_MONTH,
RTC_YEAR1,
RTC_YEAR2,
};
#define MAX8925_RTC_SEC 0x00
#define MAX8925_RTC_MIN 0x01
#define MAX8925_RTC_HOUR 0x02
#define MAX8925_RTC_WEEKDAY 0x03
#define MAX8925_RTC_DATE 0x04
#define MAX8925_RTC_MONTH 0x05
#define MAX8925_RTC_YEAR1 0x06
#define MAX8925_RTC_YEAR2 0x07
#define MAX8925_ALARM0_SEC 0x08
#define MAX8925_ALARM0_MIN 0x09
#define MAX8925_ALARM0_HOUR 0x0a
#define MAX8925_ALARM0_WEEKDAY 0x0b
#define MAX8925_ALARM0_DATE 0x0c
#define MAX8925_ALARM0_MON 0x0d
#define MAX8925_ALARM0_YEAR1 0x0e
#define MAX8925_ALARM0_YEAR2 0x0f
#define MAX8925_ALARM1_SEC 0x10
#define MAX8925_ALARM1_MIN 0x11
#define MAX8925_ALARM1_HOUR 0x12
#define MAX8925_ALARM1_WEEKDAY 0x13
#define MAX8925_ALARM1_DATE 0x14
#define MAX8925_ALARM1_MON 0x15
#define MAX8925_ALARM1_YEAR1 0x16
#define MAX8925_ALARM1_YEAR2 0x17
#define MAX8925_RTC_CNTL 0x1b
#define MAX8925_RTC_STATUS 0x20
#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 max8925_rtc_info {
struct rtc_device *rtc_dev;
struct max8925_chip *chip;
struct i2c_client *rtc;
struct device *dev;
int irq;
};
static irqreturn_t rtc_update_handler(int irq, void *data)
{
struct max8925_rtc_info *info = (struct max8925_rtc_info *)data;
/* disable ALARM0 except for 1SEC alarm */
max8925_set_bits(info->rtc, MAX8925_ALARM0_CNTL, 0x7f, 0);
rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
return IRQ_HANDLED;
}
static int tm_calc(struct rtc_time *tm, unsigned char *buf, int len)
{
if (len < TIME_NUM)
return -EINVAL;
tm->tm_year = (buf[RTC_YEAR2] >> 4) * 1000
+ (buf[RTC_YEAR2] & 0xf) * 100
+ (buf[RTC_YEAR1] >> 4) * 10
+ (buf[RTC_YEAR1] & 0xf);
tm->tm_year -= 1900;
tm->tm_mon = ((buf[RTC_MONTH] >> 4) & 0x01) * 10
+ (buf[RTC_MONTH] & 0x0f);
tm->tm_mday = ((buf[RTC_DATE] >> 4) & 0x03) * 10
+ (buf[RTC_DATE] & 0x0f);
tm->tm_wday = buf[RTC_WEEKDAY] & 0x07;
if (buf[RTC_HOUR] & HOUR_12) {
tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x1) * 10
+ (buf[RTC_HOUR] & 0x0f);
if (buf[RTC_HOUR] & HOUR_AM_PM)
tm->tm_hour += 12;
} else
tm->tm_hour = ((buf[RTC_HOUR] >> 4) & 0x03) * 10
+ (buf[RTC_HOUR] & 0x0f);
tm->tm_min = ((buf[RTC_MIN] >> 4) & 0x7) * 10
+ (buf[RTC_MIN] & 0x0f);
tm->tm_sec = ((buf[RTC_SEC] >> 4) & 0x7) * 10
+ (buf[RTC_SEC] & 0x0f);
return 0;
}
static int data_calc(unsigned char *buf, struct rtc_time *tm, int len)
{
unsigned char high, low;
if (len < TIME_NUM)
return -EINVAL;
high = (tm->tm_year + 1900) / 1000;
low = (tm->tm_year + 1900) / 100;
low = low - high * 10;
buf[RTC_YEAR2] = (high << 4) + low;
high = (tm->tm_year + 1900) / 10;
low = tm->tm_year + 1900;
low = low - high * 10;
high = high - (high / 10) * 10;
buf[RTC_YEAR1] = (high << 4) + low;
high = tm->tm_mon / 10;
low = tm->tm_mon;
low = low - high * 10;
buf[RTC_MONTH] = (high << 4) + low;
high = tm->tm_mday / 10;
low = tm->tm_mday;
low = low - high * 10;
buf[RTC_DATE] = (high << 4) + low;
buf[RTC_WEEKDAY] = tm->tm_wday;
high = tm->tm_hour / 10;
low = tm->tm_hour;
low = low - high * 10;
buf[RTC_HOUR] = (high << 4) + low;
high = tm->tm_min / 10;
low = tm->tm_min;
low = low - high * 10;
buf[RTC_MIN] = (high << 4) + low;
high = tm->tm_sec / 10;
low = tm->tm_sec;
low = low - high * 10;
buf[RTC_SEC] = (high << 4) + low;
return 0;
}
static int max8925_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct max8925_rtc_info *info = dev_get_drvdata(dev);
unsigned char buf[TIME_NUM];
int ret;
ret = max8925_bulk_read(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf);
if (ret < 0)
goto out;
ret = tm_calc(tm, buf, TIME_NUM);
out:
return ret;
}
static int max8925_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct max8925_rtc_info *info = dev_get_drvdata(dev);
unsigned char buf[TIME_NUM];
int ret;
ret = data_calc(buf, tm, TIME_NUM);
if (ret < 0)
goto out;
ret = max8925_bulk_write(info->rtc, MAX8925_RTC_SEC, TIME_NUM, buf);
out:
return ret;
}
static int max8925_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct max8925_rtc_info *info = dev_get_drvdata(dev);
unsigned char buf[TIME_NUM];
int ret;
ret = max8925_bulk_read(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf);
if (ret < 0)
goto out;
ret = tm_calc(&alrm->time, buf, TIME_NUM);
if (ret < 0)
goto out;
ret = max8925_reg_read(info->rtc, MAX8925_RTC_IRQ_MASK);
if (ret < 0)
goto out;
if (ret & ALARM0_IRQ) {
alrm->enabled = 0;
} else {
ret = max8925_reg_read(info->rtc, MAX8925_ALARM0_CNTL);
if (ret < 0)
goto out;
if (!ret)
alrm->enabled = 0;
else
alrm->enabled = 1;
}
ret = max8925_reg_read(info->rtc, MAX8925_RTC_STATUS);
if (ret < 0)
goto out;
if (ret & ALARM0_STATUS)
alrm->pending = 1;
else
alrm->pending = 0;
return 0;
out:
return ret;
}
static int max8925_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct max8925_rtc_info *info = dev_get_drvdata(dev);
unsigned char buf[TIME_NUM];
int ret;
ret = data_calc(buf, &alrm->time, TIME_NUM);
if (ret < 0)
goto out;
ret = max8925_bulk_write(info->rtc, MAX8925_ALARM0_SEC, TIME_NUM, buf);
if (ret < 0)
goto out;
if (alrm->enabled)
/* only enable alarm on year/month/day/hour/min/sec */
ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x77);
else
ret = max8925_reg_write(info->rtc, MAX8925_ALARM0_CNTL, 0x0);
if (ret < 0)
goto out;
out:
return ret;
}
static const struct rtc_class_ops max8925_rtc_ops = {
.read_time = max8925_rtc_read_time,
.set_time = max8925_rtc_set_time,
.read_alarm = max8925_rtc_read_alarm,
.set_alarm = max8925_rtc_set_alarm,
};
static int max8925_rtc_probe(struct platform_device *pdev)
{
struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
struct max8925_rtc_info *info;
int ret;
info = kzalloc(sizeof(struct max8925_rtc_info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->chip = chip;
info->rtc = chip->rtc;
info->dev = &pdev->dev;
info->irq = platform_get_irq(pdev, 0);
ret = request_threaded_irq(info->irq, NULL, rtc_update_handler,
IRQF_ONESHOT, "rtc-alarm0", info);
if (ret < 0) {
dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
info->irq, ret);
goto out_irq;
}
dev_set_drvdata(&pdev->dev, info);
/* XXX - isn't this redundant? */
platform_set_drvdata(pdev, info);
device_init_wakeup(&pdev->dev, 1);
info->rtc_dev = rtc_device_register("max8925-rtc", &pdev->dev,
&max8925_rtc_ops, THIS_MODULE);
ret = PTR_ERR(info->rtc_dev);
if (IS_ERR(info->rtc_dev)) {
dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
goto out_rtc;
}
return 0;
out_rtc:
platform_set_drvdata(pdev, NULL);
free_irq(info->irq, info);
out_irq:
kfree(info);
return ret;
}
static int max8925_rtc_remove(struct platform_device *pdev)
{
struct max8925_rtc_info *info = platform_get_drvdata(pdev);
if (info) {
free_irq(info->irq, info);
rtc_device_unregister(info->rtc_dev);
kfree(info);
}
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int max8925_rtc_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
if (device_may_wakeup(dev))
chip->wakeup_flag |= 1 << MAX8925_IRQ_RTC_ALARM0;
return 0;
}
static int max8925_rtc_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
if (device_may_wakeup(dev))
chip->wakeup_flag &= ~(1 << MAX8925_IRQ_RTC_ALARM0);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(max8925_rtc_pm_ops, max8925_rtc_suspend, max8925_rtc_resume);
static struct platform_driver max8925_rtc_driver = {
.driver = {
.name = "max8925-rtc",
.owner = THIS_MODULE,
.pm = &max8925_rtc_pm_ops,
},
.probe = max8925_rtc_probe,
.remove = max8925_rtc_remove,
};
module_platform_driver(max8925_rtc_driver);
MODULE_DESCRIPTION("Maxim MAX8925 RTC driver");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_LICENSE("GPL");