mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 00:46:40 +07:00
ede3e9d47c
This patch adds alarm support for the NXP PCF8563 chip. Signed-off-by: Vincent Donnefort <vdonnefort@gmail.com> Cc: Simon Guinot <simon.guinot@sequanux.org> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
472 lines
12 KiB
C
472 lines
12 KiB
C
/*
|
|
* An I2C driver for the Philips PCF8563 RTC
|
|
* Copyright 2005-06 Tower Technologies
|
|
*
|
|
* Author: Alessandro Zummo <a.zummo@towertech.it>
|
|
* Maintainers: http://www.nslu2-linux.org/
|
|
*
|
|
* based on the other drivers in this same directory.
|
|
*
|
|
* http://www.semiconductors.philips.com/acrobat/datasheets/PCF8563-04.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>
|
|
#include <linux/err.h>
|
|
|
|
#define DRV_VERSION "0.4.3"
|
|
|
|
#define PCF8563_REG_ST1 0x00 /* status */
|
|
#define PCF8563_REG_ST2 0x01
|
|
#define PCF8563_BIT_AIE (1 << 1)
|
|
#define PCF8563_BIT_AF (1 << 3)
|
|
|
|
#define PCF8563_REG_SC 0x02 /* datetime */
|
|
#define PCF8563_REG_MN 0x03
|
|
#define PCF8563_REG_HR 0x04
|
|
#define PCF8563_REG_DM 0x05
|
|
#define PCF8563_REG_DW 0x06
|
|
#define PCF8563_REG_MO 0x07
|
|
#define PCF8563_REG_YR 0x08
|
|
|
|
#define PCF8563_REG_AMN 0x09 /* alarm */
|
|
|
|
#define PCF8563_REG_CLKO 0x0D /* clock out */
|
|
#define PCF8563_REG_TMRC 0x0E /* timer control */
|
|
#define PCF8563_REG_TMR 0x0F /* timer */
|
|
|
|
#define PCF8563_SC_LV 0x80 /* low voltage */
|
|
#define PCF8563_MO_C 0x80 /* century */
|
|
|
|
static struct i2c_driver pcf8563_driver;
|
|
|
|
struct pcf8563 {
|
|
struct rtc_device *rtc;
|
|
/*
|
|
* The meaning of MO_C bit varies by the chip type.
|
|
* From PCF8563 datasheet: this bit is toggled when the years
|
|
* register overflows from 99 to 00
|
|
* 0 indicates the century is 20xx
|
|
* 1 indicates the century is 19xx
|
|
* From RTC8564 datasheet: this bit indicates change of
|
|
* century. When the year digit data overflows from 99 to 00,
|
|
* this bit is set. By presetting it to 0 while still in the
|
|
* 20th century, it will be set in year 2000, ...
|
|
* There seems no reliable way to know how the system use this
|
|
* bit. So let's do it heuristically, assuming we are live in
|
|
* 1970...2069.
|
|
*/
|
|
int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */
|
|
int voltage_low; /* incicates if a low_voltage was detected */
|
|
|
|
struct i2c_client *client;
|
|
};
|
|
|
|
static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg,
|
|
unsigned char length, unsigned char *buf)
|
|
{
|
|
struct i2c_msg msgs[] = {
|
|
{/* setup read ptr */
|
|
.addr = client->addr,
|
|
.len = 1,
|
|
.buf = ®,
|
|
},
|
|
{
|
|
.addr = client->addr,
|
|
.flags = I2C_M_RD,
|
|
.len = length,
|
|
.buf = buf
|
|
},
|
|
};
|
|
|
|
if ((i2c_transfer(client->adapter, msgs, 2)) != 2) {
|
|
dev_err(&client->dev, "%s: read error\n", __func__);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pcf8563_write_block_data(struct i2c_client *client,
|
|
unsigned char reg, unsigned char length,
|
|
unsigned char *buf)
|
|
{
|
|
int i, err;
|
|
|
|
for (i = 0; i < length; i++) {
|
|
unsigned char data[2] = { reg + i, buf[i] };
|
|
|
|
err = i2c_master_send(client, data, sizeof(data));
|
|
if (err != sizeof(data)) {
|
|
dev_err(&client->dev,
|
|
"%s: err=%d addr=%02x, data=%02x\n",
|
|
__func__, err, data[0], data[1]);
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on)
|
|
{
|
|
unsigned char buf[2];
|
|
int err;
|
|
|
|
err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, buf + 1);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (on)
|
|
buf[1] |= PCF8563_BIT_AIE;
|
|
else
|
|
buf[1] &= ~PCF8563_BIT_AIE;
|
|
|
|
buf[1] &= ~PCF8563_BIT_AF;
|
|
buf[0] = PCF8563_REG_ST2;
|
|
|
|
err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, buf + 1);
|
|
if (err < 0) {
|
|
dev_err(&client->dev, "%s: write error\n", __func__);
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en,
|
|
unsigned char *pen)
|
|
{
|
|
unsigned char buf;
|
|
int err;
|
|
|
|
err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf);
|
|
if (err)
|
|
return err;
|
|
|
|
if (en)
|
|
*en = !!(buf & PCF8563_BIT_AIE);
|
|
if (pen)
|
|
*pen = !!(buf & PCF8563_BIT_AF);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t pcf8563_irq(int irq, void *dev_id)
|
|
{
|
|
struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id);
|
|
int err;
|
|
char pending;
|
|
|
|
err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (pending) {
|
|
rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF);
|
|
pcf8563_set_alarm_mode(pcf8563->client, 1);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
/*
|
|
* In the routines that deal directly with the pcf8563 hardware, we use
|
|
* rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
|
|
*/
|
|
static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm)
|
|
{
|
|
struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
|
|
unsigned char buf[9];
|
|
int err;
|
|
|
|
err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf);
|
|
if (err)
|
|
return err;
|
|
|
|
if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) {
|
|
pcf8563->voltage_low = 1;
|
|
dev_info(&client->dev,
|
|
"low voltage detected, date/time is not reliable.\n");
|
|
}
|
|
|
|
dev_dbg(&client->dev,
|
|
"%s: raw data is st1=%02x, st2=%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]);
|
|
|
|
|
|
tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F);
|
|
tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F);
|
|
tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */
|
|
tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F);
|
|
tm->tm_wday = buf[PCF8563_REG_DW] & 0x07;
|
|
tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */
|
|
tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]);
|
|
if (tm->tm_year < 70)
|
|
tm->tm_year += 100; /* assume we are in 1970...2069 */
|
|
/* detect the polarity heuristically. see note above. */
|
|
pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ?
|
|
(tm->tm_year >= 100) : (tm->tm_year < 100);
|
|
|
|
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 pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm)
|
|
{
|
|
struct pcf8563 *pcf8563 = i2c_get_clientdata(client);
|
|
int err;
|
|
unsigned char buf[9];
|
|
|
|
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);
|
|
|
|
/* hours, minutes and seconds */
|
|
buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec);
|
|
buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min);
|
|
buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour);
|
|
|
|
buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday);
|
|
|
|
/* month, 1 - 12 */
|
|
buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1);
|
|
|
|
/* year and century */
|
|
buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year % 100);
|
|
if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100))
|
|
buf[PCF8563_REG_MO] |= PCF8563_MO_C;
|
|
|
|
buf[PCF8563_REG_DW] = tm->tm_wday & 0x07;
|
|
|
|
err = pcf8563_write_block_data(client, PCF8563_REG_SC,
|
|
9 - PCF8563_REG_SC, buf + PCF8563_REG_SC);
|
|
if (err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_RTC_INTF_DEV
|
|
static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev));
|
|
struct rtc_time tm;
|
|
|
|
switch (cmd) {
|
|
case RTC_VL_READ:
|
|
if (pcf8563->voltage_low)
|
|
dev_info(dev, "low voltage detected, date/time is not reliable.\n");
|
|
|
|
if (copy_to_user((void __user *)arg, &pcf8563->voltage_low,
|
|
sizeof(int)))
|
|
return -EFAULT;
|
|
return 0;
|
|
case RTC_VL_CLR:
|
|
/*
|
|
* Clear the VL bit in the seconds register in case
|
|
* the time has not been set already (which would
|
|
* have cleared it). This does not really matter
|
|
* because of the cached voltage_low value but do it
|
|
* anyway for consistency.
|
|
*/
|
|
if (pcf8563_get_datetime(to_i2c_client(dev), &tm))
|
|
pcf8563_set_datetime(to_i2c_client(dev), &tm);
|
|
|
|
/* Clear the cached value. */
|
|
pcf8563->voltage_low = 0;
|
|
|
|
return 0;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
#else
|
|
#define pcf8563_rtc_ioctl NULL
|
|
#endif
|
|
|
|
static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
return pcf8563_get_datetime(to_i2c_client(dev), tm);
|
|
}
|
|
|
|
static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
return pcf8563_set_datetime(to_i2c_client(dev), tm);
|
|
}
|
|
|
|
static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
unsigned char buf[4];
|
|
int err;
|
|
|
|
err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf);
|
|
if (err)
|
|
return err;
|
|
|
|
dev_dbg(&client->dev,
|
|
"%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n",
|
|
__func__, buf[0], buf[1], buf[2], buf[3]);
|
|
|
|
tm->time.tm_min = bcd2bin(buf[0] & 0x7F);
|
|
tm->time.tm_hour = bcd2bin(buf[1] & 0x7F);
|
|
tm->time.tm_mday = bcd2bin(buf[2] & 0x1F);
|
|
tm->time.tm_wday = bcd2bin(buf[3] & 0x7);
|
|
tm->time.tm_mon = -1;
|
|
tm->time.tm_year = -1;
|
|
tm->time.tm_yday = -1;
|
|
tm->time.tm_isdst = -1;
|
|
|
|
err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d,"
|
|
" enabled=%d, pending=%d\n", __func__, tm->time.tm_min,
|
|
tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday,
|
|
tm->enabled, tm->pending);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
unsigned char buf[4];
|
|
int err;
|
|
|
|
dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d "
|
|
"enabled=%d pending=%d\n", __func__,
|
|
tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday,
|
|
tm->time.tm_mday, tm->enabled, tm->pending);
|
|
|
|
buf[0] = bin2bcd(tm->time.tm_min);
|
|
buf[1] = bin2bcd(tm->time.tm_hour);
|
|
buf[2] = bin2bcd(tm->time.tm_mday);
|
|
buf[3] = tm->time.tm_wday & 0x07;
|
|
|
|
err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf);
|
|
if (err)
|
|
return err;
|
|
|
|
return pcf8563_set_alarm_mode(client, 1);
|
|
}
|
|
|
|
static int pcf8563_irq_enable(struct device *dev, unsigned int enabled)
|
|
{
|
|
return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled);
|
|
}
|
|
|
|
static const struct rtc_class_ops pcf8563_rtc_ops = {
|
|
.ioctl = pcf8563_rtc_ioctl,
|
|
.read_time = pcf8563_rtc_read_time,
|
|
.set_time = pcf8563_rtc_set_time,
|
|
.read_alarm = pcf8563_rtc_read_alarm,
|
|
.set_alarm = pcf8563_rtc_set_alarm,
|
|
.alarm_irq_enable = pcf8563_irq_enable,
|
|
};
|
|
|
|
static int pcf8563_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct pcf8563 *pcf8563;
|
|
int err;
|
|
|
|
dev_dbg(&client->dev, "%s\n", __func__);
|
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
|
|
return -ENODEV;
|
|
|
|
pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563),
|
|
GFP_KERNEL);
|
|
if (!pcf8563)
|
|
return -ENOMEM;
|
|
|
|
dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
|
|
|
|
i2c_set_clientdata(client, pcf8563);
|
|
pcf8563->client = client;
|
|
device_set_wakeup_capable(&client->dev, 1);
|
|
|
|
pcf8563->rtc = devm_rtc_device_register(&client->dev,
|
|
pcf8563_driver.driver.name,
|
|
&pcf8563_rtc_ops, THIS_MODULE);
|
|
|
|
if (IS_ERR(pcf8563->rtc))
|
|
return PTR_ERR(pcf8563->rtc);
|
|
|
|
if (client->irq > 0) {
|
|
err = devm_request_threaded_irq(&client->dev, client->irq,
|
|
NULL, pcf8563_irq,
|
|
IRQF_SHARED|IRQF_ONESHOT|IRQF_TRIGGER_FALLING,
|
|
pcf8563->rtc->name, client);
|
|
if (err) {
|
|
dev_err(&client->dev, "unable to request IRQ %d\n",
|
|
client->irq);
|
|
return err;
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id pcf8563_id[] = {
|
|
{ "pcf8563", 0 },
|
|
{ "rtc8564", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, pcf8563_id);
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id pcf8563_of_match[] = {
|
|
{ .compatible = "nxp,pcf8563" },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, pcf8563_of_match);
|
|
#endif
|
|
|
|
static struct i2c_driver pcf8563_driver = {
|
|
.driver = {
|
|
.name = "rtc-pcf8563",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = of_match_ptr(pcf8563_of_match),
|
|
},
|
|
.probe = pcf8563_probe,
|
|
.id_table = pcf8563_id,
|
|
};
|
|
|
|
module_i2c_driver(pcf8563_driver);
|
|
|
|
MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
|
|
MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(DRV_VERSION);
|