mirror of
https://github.com/torvalds/linux.git
synced 2024-11-10 22:21:40 +00:00
rtc: add NXP PCF2127 support (i2c)
Added support for NXP PCF2127 RTC (i2c). [akpm@linux-foundation.org: fix typo, fix warnings] Signed-off-by: Renaud Cerrato <r.cerrato@til-technologies.fr> Cc: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
2c5a5b3091
commit
18cb6368f0
@ -313,6 +313,15 @@ config RTC_DRV_PALMAS
|
||||
This driver can also be built as a module. If so, the module
|
||||
will be called rtc-palma.
|
||||
|
||||
config RTC_DRV_PCF2127
|
||||
tristate "NXP PCF2127"
|
||||
help
|
||||
If you say yes here you get support for the NXP PCF2127/29 RTC
|
||||
chips.
|
||||
|
||||
This driver can also be built as a module. If so, the module
|
||||
will be called rtc-pcf2127.
|
||||
|
||||
config RTC_DRV_PCF8523
|
||||
tristate "NXP PCF8523"
|
||||
help
|
||||
|
@ -83,6 +83,7 @@ obj-$(CONFIG_RTC_DRV_NUC900) += rtc-nuc900.o
|
||||
obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o
|
||||
obj-$(CONFIG_RTC_DRV_PALMAS) += rtc-palmas.o
|
||||
obj-$(CONFIG_RTC_DRV_PCAP) += rtc-pcap.o
|
||||
obj-$(CONFIG_RTC_DRV_PCF2127) += rtc-pcf2127.o
|
||||
obj-$(CONFIG_RTC_DRV_PCF8523) += rtc-pcf8523.o
|
||||
obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o
|
||||
obj-$(CONFIG_RTC_DRV_PCF8583) += rtc-pcf8583.o
|
||||
|
241
drivers/rtc/rtc-pcf2127.c
Normal file
241
drivers/rtc/rtc-pcf2127.c
Normal file
@ -0,0 +1,241 @@
|
||||
/*
|
||||
* An I2C driver for the NXP PCF2127 RTC
|
||||
* Copyright 2013 Til-Technologies
|
||||
*
|
||||
* Author: Renaud Cerrato <r.cerrato@til-technologies.fr>
|
||||
*
|
||||
* based on the other drivers in this same directory.
|
||||
*
|
||||
* http://www.nxp.com/documents/data_sheet/PCF2127AT.pdf
|
||||
*
|
||||
* 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/i2c.h>
|
||||
#include <linux/bcd.h>
|
||||
#include <linux/rtc.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/of.h>
|
||||
|
||||
#define DRV_VERSION "0.0.1"
|
||||
|
||||
#define PCF2127_REG_CTRL1 (0x00) /* Control Register 1 */
|
||||
#define PCF2127_REG_CTRL2 (0x01) /* Control Register 2 */
|
||||
#define PCF2127_REG_CTRL3 (0x02) /* Control Register 3 */
|
||||
#define PCF2127_REG_SC (0x03) /* datetime */
|
||||
#define PCF2127_REG_MN (0x04)
|
||||
#define PCF2127_REG_HR (0x05)
|
||||
#define PCF2127_REG_DM (0x06)
|
||||
#define PCF2127_REG_DW (0x07)
|
||||
#define PCF2127_REG_MO (0x08)
|
||||
#define PCF2127_REG_YR (0x09)
|
||||
|
||||
static struct i2c_driver pcf2127_driver;
|
||||
|
||||
struct pcf2127 {
|
||||
struct rtc_device *rtc;
|
||||
int voltage_low; /* indicates if a low_voltage was detected */
|
||||
};
|
||||
|
||||
/*
|
||||
* In the routines that deal directly with the pcf2127 hardware, we use
|
||||
* rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
|
||||
*/
|
||||
static int pcf2127_get_datetime(struct i2c_client *client, struct rtc_time *tm)
|
||||
{
|
||||
struct pcf2127 *pcf2127 = i2c_get_clientdata(client);
|
||||
unsigned char buf[10] = { PCF2127_REG_CTRL1 };
|
||||
|
||||
/* read registers */
|
||||
if (i2c_master_send(client, buf, 1) != 1 ||
|
||||
i2c_master_recv(client, buf, sizeof(buf)) != sizeof(buf)) {
|
||||
dev_err(&client->dev, "%s: read error\n", __func__);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
if (buf[PCF2127_REG_CTRL3] & 0x04) {
|
||||
pcf2127->voltage_low = 1;
|
||||
dev_info(&client->dev,
|
||||
"low voltage detected, date/time is not reliable.\n");
|
||||
}
|
||||
|
||||
dev_dbg(&client->dev,
|
||||
"%s: raw data is cr1=%02x, cr2=%02x, cr3=%02x, "
|
||||
"sec=%02x, min=%02x, hr=%02x, "
|
||||
"mday=%02x, wday=%02x, mon=%02x, year=%02x\n",
|
||||
__func__,
|
||||
buf[0], buf[1], buf[2],
|
||||
buf[3], buf[4], buf[5],
|
||||
buf[6], buf[7], buf[8], buf[9]);
|
||||
|
||||
|
||||
tm->tm_sec = bcd2bin(buf[PCF2127_REG_SC] & 0x7F);
|
||||
tm->tm_min = bcd2bin(buf[PCF2127_REG_MN] & 0x7F);
|
||||
tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F); /* rtc hr 0-23 */
|
||||
tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F);
|
||||
tm->tm_wday = buf[PCF2127_REG_DW] & 0x07;
|
||||
tm->tm_mon = bcd2bin(buf[PCF2127_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
|
||||
tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]);
|
||||
if (tm->tm_year < 70)
|
||||
tm->tm_year += 100; /* assume we are in 1970...2069 */
|
||||
|
||||
dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
|
||||
"mday=%d, mon=%d, year=%d, wday=%d\n",
|
||||
__func__,
|
||||
tm->tm_sec, tm->tm_min, tm->tm_hour,
|
||||
tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
|
||||
|
||||
/* the clock can give out invalid datetime, but we cannot return
|
||||
* -EINVAL otherwise hwclock will refuse to set the time on bootup.
|
||||
*/
|
||||
if (rtc_valid_tm(tm) < 0)
|
||||
dev_err(&client->dev, "retrieved date/time is not valid.\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pcf2127_set_datetime(struct i2c_client *client, struct rtc_time *tm)
|
||||
{
|
||||
unsigned char buf[8];
|
||||
int i = 0, err;
|
||||
|
||||
dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, "
|
||||
"mday=%d, mon=%d, year=%d, wday=%d\n",
|
||||
__func__,
|
||||
tm->tm_sec, tm->tm_min, tm->tm_hour,
|
||||
tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
|
||||
|
||||
/* start register address */
|
||||
buf[i++] = PCF2127_REG_SC;
|
||||
|
||||
/* hours, minutes and seconds */
|
||||
buf[i++] = bin2bcd(tm->tm_sec);
|
||||
buf[i++] = bin2bcd(tm->tm_min);
|
||||
buf[i++] = bin2bcd(tm->tm_hour);
|
||||
buf[i++] = bin2bcd(tm->tm_mday);
|
||||
buf[i++] = tm->tm_wday & 0x07;
|
||||
|
||||
/* month, 1 - 12 */
|
||||
buf[i++] = bin2bcd(tm->tm_mon + 1);
|
||||
|
||||
/* year */
|
||||
buf[i++] = bin2bcd(tm->tm_year % 100);
|
||||
|
||||
/* write register's data */
|
||||
err = i2c_master_send(client, buf, i);
|
||||
if (err != i) {
|
||||
dev_err(&client->dev,
|
||||
"%s: err=%d", __func__, err);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_RTC_INTF_DEV
|
||||
static int pcf2127_rtc_ioctl(struct device *dev,
|
||||
unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
struct pcf2127 *pcf2127 = i2c_get_clientdata(to_i2c_client(dev));
|
||||
|
||||
switch (cmd) {
|
||||
case RTC_VL_READ:
|
||||
if (pcf2127->voltage_low)
|
||||
dev_info(dev, "low voltage detected, date/time is not reliable.\n");
|
||||
|
||||
if (copy_to_user((void __user *)arg, &pcf2127->voltage_low,
|
||||
sizeof(int)))
|
||||
return -EFAULT;
|
||||
return 0;
|
||||
default:
|
||||
return -ENOIOCTLCMD;
|
||||
}
|
||||
}
|
||||
#else
|
||||
#define pcf2127_rtc_ioctl NULL
|
||||
#endif
|
||||
|
||||
static int pcf2127_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
||||
{
|
||||
return pcf2127_get_datetime(to_i2c_client(dev), tm);
|
||||
}
|
||||
|
||||
static int pcf2127_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
||||
{
|
||||
return pcf2127_set_datetime(to_i2c_client(dev), tm);
|
||||
}
|
||||
|
||||
static const struct rtc_class_ops pcf2127_rtc_ops = {
|
||||
.ioctl = pcf2127_rtc_ioctl,
|
||||
.read_time = pcf2127_rtc_read_time,
|
||||
.set_time = pcf2127_rtc_set_time,
|
||||
};
|
||||
|
||||
static int pcf2127_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct pcf2127 *pcf2127;
|
||||
|
||||
dev_dbg(&client->dev, "%s\n", __func__);
|
||||
|
||||
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
|
||||
return -ENODEV;
|
||||
|
||||
pcf2127 = devm_kzalloc(&client->dev, sizeof(struct pcf2127),
|
||||
GFP_KERNEL);
|
||||
if (!pcf2127)
|
||||
return -ENOMEM;
|
||||
|
||||
dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
|
||||
|
||||
i2c_set_clientdata(client, pcf2127);
|
||||
|
||||
pcf2127->rtc = devm_rtc_device_register(&client->dev,
|
||||
pcf2127_driver.driver.name,
|
||||
&pcf2127_rtc_ops, THIS_MODULE);
|
||||
|
||||
if (IS_ERR(pcf2127->rtc))
|
||||
return PTR_ERR(pcf2127->rtc);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pcf2127_remove(struct i2c_client *client)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct i2c_device_id pcf2127_id[] = {
|
||||
{ "pcf2127", 0 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, pcf2127_id);
|
||||
|
||||
#ifdef CONFIG_OF
|
||||
static const struct of_device_id pcf2127_of_match[] = {
|
||||
{ .compatible = "nxp,pcf2127" },
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, pcf2127_of_match);
|
||||
#endif
|
||||
|
||||
static struct i2c_driver pcf2127_driver = {
|
||||
.driver = {
|
||||
.name = "rtc-pcf2127",
|
||||
.owner = THIS_MODULE,
|
||||
.of_match_table = of_match_ptr(pcf2127_of_match),
|
||||
},
|
||||
.probe = pcf2127_probe,
|
||||
.remove = pcf2127_remove,
|
||||
.id_table = pcf2127_id,
|
||||
};
|
||||
|
||||
module_i2c_driver(pcf2127_driver);
|
||||
|
||||
MODULE_AUTHOR("Renaud Cerrato <r.cerrato@til-technologies.fr>");
|
||||
MODULE_DESCRIPTION("NXP PCF2127 RTC driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_VERSION(DRV_VERSION);
|
Loading…
Reference in New Issue
Block a user