mirror of
https://github.com/torvalds/linux.git
synced 2025-11-03 18:20:25 +02:00
rtc: add MAX8907 RTC driver
The MAX8907 is an I2C-based power-management IC containing voltage regulators, a reset controller, a real-time clock, and a touch-screen controller. The driver is based on an original by or fixed by: * Tom Cherry * Prashant Gaikwad * Joseph Yoon During upstreaming, I (swarren): * Converted to regmap. * Fixed handling of RTC_HOUR register containing 12. * Fixed handling of RTC_WEEKDAY register. * General cleanup. Signed-off-by: Stephen Warren <swarren@nvidia.com> Cc: Tom Cherry <tcherry@nvidia.com> Cc: Prashant Gaikwad <pgaikwad@nvidia.com> Cc: Joseph Yoon <tyoon@nvidia.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stephen Warren
Linus Torvalds
parent
0e783980b8
commit
94c01ab6d7
3 changed files with 255 additions and 0 deletions
|
|
@ -205,6 +205,16 @@ config RTC_DRV_MAX6900
|
|||
This driver can also be built as a module. If so, the module
|
||||
will be called rtc-max6900.
|
||||
|
||||
config RTC_DRV_MAX8907
|
||||
tristate "Maxim MAX8907"
|
||||
depends on MFD_MAX8907
|
||||
help
|
||||
If you say yes here you will get support for the
|
||||
RTC of Maxim MAX8907 PMIC.
|
||||
|
||||
This driver can also be built as a module. If so, the module
|
||||
will be called rtc-max8907.
|
||||
|
||||
config RTC_DRV_MAX8925
|
||||
tristate "Maxim MAX8925"
|
||||
depends on MFD_MAX8925
|
||||
|
|
|
|||
|
|
@ -65,6 +65,7 @@ obj-$(CONFIG_RTC_DRV_M48T59) += rtc-m48t59.o
|
|||
obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o
|
||||
obj-$(CONFIG_RTC_DRV_MXC) += rtc-mxc.o
|
||||
obj-$(CONFIG_RTC_DRV_MAX6900) += rtc-max6900.o
|
||||
obj-$(CONFIG_RTC_DRV_MAX8907) += rtc-max8907.o
|
||||
obj-$(CONFIG_RTC_DRV_MAX8925) += rtc-max8925.o
|
||||
obj-$(CONFIG_RTC_DRV_MAX8998) += rtc-max8998.o
|
||||
obj-$(CONFIG_RTC_DRV_MAX6902) += rtc-max6902.o
|
||||
|
|
|
|||
244
drivers/rtc/rtc-max8907.c
Normal file
244
drivers/rtc/rtc-max8907.c
Normal file
|
|
@ -0,0 +1,244 @@
|
|||
/*
|
||||
* RTC driver for Maxim MAX8907
|
||||
*
|
||||
* Copyright (c) 2011-2012, NVIDIA Corporation.
|
||||
*
|
||||
* Based on drivers/rtc/rtc-max8925.c,
|
||||
* Copyright (C) 2009-2010 Marvell International Ltd.
|
||||
*
|
||||
* 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/bcd.h>
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/mfd/max8907.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/regmap.h>
|
||||
#include <linux/rtc.h>
|
||||
#include <linux/slab.h>
|
||||
|
||||
enum {
|
||||
RTC_SEC = 0,
|
||||
RTC_MIN,
|
||||
RTC_HOUR,
|
||||
RTC_WEEKDAY,
|
||||
RTC_DATE,
|
||||
RTC_MONTH,
|
||||
RTC_YEAR1,
|
||||
RTC_YEAR2,
|
||||
};
|
||||
|
||||
#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 max8907_rtc {
|
||||
struct max8907 *max8907;
|
||||
struct regmap *regmap;
|
||||
struct rtc_device *rtc_dev;
|
||||
int irq;
|
||||
};
|
||||
|
||||
static irqreturn_t max8907_irq_handler(int irq, void *data)
|
||||
{
|
||||
struct max8907_rtc *rtc = data;
|
||||
|
||||
regmap_update_bits(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0x7f, 0);
|
||||
|
||||
rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static void regs_to_tm(u8 *regs, struct rtc_time *tm)
|
||||
{
|
||||
tm->tm_year = bcd2bin(regs[RTC_YEAR2]) * 100 +
|
||||
bcd2bin(regs[RTC_YEAR1]) - 1900;
|
||||
tm->tm_mon = bcd2bin(regs[RTC_MONTH] & 0x1f) - 1;
|
||||
tm->tm_mday = bcd2bin(regs[RTC_DATE] & 0x3f);
|
||||
tm->tm_wday = (regs[RTC_WEEKDAY] & 0x07) - 1;
|
||||
if (regs[RTC_HOUR] & HOUR_12) {
|
||||
tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x01f);
|
||||
if (tm->tm_hour == 12)
|
||||
tm->tm_hour = 0;
|
||||
if (regs[RTC_HOUR] & HOUR_AM_PM)
|
||||
tm->tm_hour += 12;
|
||||
} else {
|
||||
tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x03f);
|
||||
}
|
||||
tm->tm_min = bcd2bin(regs[RTC_MIN] & 0x7f);
|
||||
tm->tm_sec = bcd2bin(regs[RTC_SEC] & 0x7f);
|
||||
}
|
||||
|
||||
static void tm_to_regs(struct rtc_time *tm, u8 *regs)
|
||||
{
|
||||
u8 high, low;
|
||||
|
||||
high = (tm->tm_year + 1900) / 100;
|
||||
low = tm->tm_year % 100;
|
||||
regs[RTC_YEAR2] = bin2bcd(high);
|
||||
regs[RTC_YEAR1] = bin2bcd(low);
|
||||
regs[RTC_MONTH] = bin2bcd(tm->tm_mon + 1);
|
||||
regs[RTC_DATE] = bin2bcd(tm->tm_mday);
|
||||
regs[RTC_WEEKDAY] = tm->tm_wday + 1;
|
||||
regs[RTC_HOUR] = bin2bcd(tm->tm_hour);
|
||||
regs[RTC_MIN] = bin2bcd(tm->tm_min);
|
||||
regs[RTC_SEC] = bin2bcd(tm->tm_sec);
|
||||
}
|
||||
|
||||
static int max8907_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
||||
{
|
||||
struct max8907_rtc *rtc = dev_get_drvdata(dev);
|
||||
u8 regs[TIME_NUM];
|
||||
int ret;
|
||||
|
||||
ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_RTC_SEC, regs,
|
||||
TIME_NUM);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
regs_to_tm(regs, tm);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int max8907_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
||||
{
|
||||
struct max8907_rtc *rtc = dev_get_drvdata(dev);
|
||||
u8 regs[TIME_NUM];
|
||||
|
||||
tm_to_regs(tm, regs);
|
||||
|
||||
return regmap_bulk_write(rtc->regmap, MAX8907_REG_RTC_SEC, regs,
|
||||
TIME_NUM);
|
||||
}
|
||||
|
||||
static int max8907_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
||||
{
|
||||
struct max8907_rtc *rtc = dev_get_drvdata(dev);
|
||||
u8 regs[TIME_NUM];
|
||||
unsigned int val;
|
||||
int ret;
|
||||
|
||||
ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs,
|
||||
TIME_NUM);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
regs_to_tm(regs, &alrm->time);
|
||||
|
||||
ret = regmap_read(rtc->regmap, MAX8907_REG_ALARM0_CNTL, &val);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
alrm->enabled = !!(val & 0x7f);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int max8907_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
||||
{
|
||||
struct max8907_rtc *rtc = dev_get_drvdata(dev);
|
||||
u8 regs[TIME_NUM];
|
||||
int ret;
|
||||
|
||||
tm_to_regs(&alrm->time, regs);
|
||||
|
||||
/* Disable alarm while we update the target time */
|
||||
ret = regmap_update_bits(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0x7f, 0);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = regmap_bulk_write(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs,
|
||||
TIME_NUM);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
if (alrm->enabled)
|
||||
ret = regmap_update_bits(rtc->regmap, MAX8907_REG_ALARM0_CNTL,
|
||||
0x7f, 0x7f);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct rtc_class_ops max8907_rtc_ops = {
|
||||
.read_time = max8907_rtc_read_time,
|
||||
.set_time = max8907_rtc_set_time,
|
||||
.read_alarm = max8907_rtc_read_alarm,
|
||||
.set_alarm = max8907_rtc_set_alarm,
|
||||
};
|
||||
|
||||
static int __devinit max8907_rtc_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent);
|
||||
struct max8907_rtc *rtc;
|
||||
int ret;
|
||||
|
||||
rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
|
||||
if (!rtc)
|
||||
return -ENOMEM;
|
||||
platform_set_drvdata(pdev, rtc);
|
||||
|
||||
rtc->max8907 = max8907;
|
||||
rtc->regmap = max8907->regmap_rtc;
|
||||
|
||||
rtc->rtc_dev = rtc_device_register("max8907-rtc", &pdev->dev,
|
||||
&max8907_rtc_ops, THIS_MODULE);
|
||||
if (IS_ERR(rtc->rtc_dev)) {
|
||||
ret = PTR_ERR(rtc->rtc_dev);
|
||||
dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
rtc->irq = regmap_irq_get_virq(max8907->irqc_rtc,
|
||||
MAX8907_IRQ_RTC_ALARM0);
|
||||
if (rtc->irq < 0) {
|
||||
ret = rtc->irq;
|
||||
goto err_unregister;
|
||||
}
|
||||
|
||||
ret = request_threaded_irq(rtc->irq, NULL, max8907_irq_handler,
|
||||
IRQF_ONESHOT, "max8907-alarm0", rtc);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "Failed to request IRQ%d: %d\n",
|
||||
rtc->irq, ret);
|
||||
goto err_unregister;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
err_unregister:
|
||||
rtc_device_unregister(rtc->rtc_dev);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __devexit max8907_rtc_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct max8907_rtc *rtc = platform_get_drvdata(pdev);
|
||||
|
||||
free_irq(rtc->irq, rtc);
|
||||
rtc_device_unregister(rtc->rtc_dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver max8907_rtc_driver = {
|
||||
.driver = {
|
||||
.name = "max8907-rtc",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = max8907_rtc_probe,
|
||||
.remove = __devexit_p(max8907_rtc_remove),
|
||||
};
|
||||
module_platform_driver(max8907_rtc_driver);
|
||||
|
||||
MODULE_DESCRIPTION("Maxim MAX8907 RTC driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in a new issue