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Commit 370927c4 authored by Akinobu Mita's avatar Akinobu Mita Committed by Alexandre Belloni
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rtc: ds3232: convert to use regmap 

This is preparation for merging rtc-ds3232 i2c driver and rtc-ds3234
spi driver.
Signed-off-by: default avatarAkinobu Mita <akinobu.mita@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: Dennis Aberilla <denzzzhome@yahoo.com>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
parent 832315b0
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Showing with 113 additions and 103 deletions
drivers/rtc/rtc-ds3232.c
View file @ 370927c4
......@@ -9,11 +9,6 @@
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
/*
* It would be more efficient to use i2c msgs/i2c_transfer directly but, as
* recommened in .../Documentation/i2c/writing-clients section
* "Sending and receiving", using SMBus level communication is preferred.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
......@@ -25,6 +20,7 @@
#include <linux/bcd.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/regmap.h>
#define DS3232_REG_SECONDS 0x00
#define DS3232_REG_MINUTES 0x01
......@@ -50,7 +46,9 @@
# define DS3232_REG_SR_A1F 0x01
struct ds3232 {
struct i2c_client *client;
struct device *dev;
struct regmap *regmap;
int irq;
struct rtc_device *rtc;
struct work_struct work;
......@@ -63,26 +61,25 @@ struct ds3232 {
int exiting;
};
static struct i2c_driver ds3232_driver;
static int ds3232_check_rtc_status(struct i2c_client *client)
static int ds3232_check_rtc_status(struct device *dev)
{
struct ds3232 *ds3232 = dev_get_drvdata(dev);
int ret = 0;
int control, stat;
stat = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
if (stat < 0)
return stat;
ret = regmap_read(ds3232->regmap, DS3232_REG_SR, &stat);
if (ret)
return ret;
if (stat & DS3232_REG_SR_OSF)
dev_warn(&client->dev,
dev_warn(dev,
"oscillator discontinuity flagged, "
"time unreliable\n");
stat &= ~(DS3232_REG_SR_OSF | DS3232_REG_SR_A1F | DS3232_REG_SR_A2F);
ret = i2c_smbus_write_byte_data(client, DS3232_REG_SR, stat);
if (ret < 0)
ret = regmap_write(ds3232->regmap, DS3232_REG_SR, stat);
if (ret)
return ret;
/* If the alarm is pending, clear it before requesting
......@@ -90,31 +87,28 @@ static int ds3232_check_rtc_status(struct i2c_client *client)
* before everything is initialized.
*/
control = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
if (control < 0)
return control;
ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control);
if (ret)
return ret;
control &= ~(DS3232_REG_CR_A1IE | DS3232_REG_CR_A2IE);
control |= DS3232_REG_CR_INTCN;
return i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
return regmap_write(ds3232->regmap, DS3232_REG_CR, control);
}
static int ds3232_read_time(struct device *dev, struct rtc_time *time)
{
struct i2c_client *client = to_i2c_client(dev);
struct ds3232 *ds3232 = dev_get_drvdata(dev);
int ret;
u8 buf[7];
unsigned int year, month, day, hour, minute, second;
unsigned int week, twelve_hr, am_pm;
unsigned int century, add_century = 0;
ret = i2c_smbus_read_i2c_block_data(client, DS3232_REG_SECONDS, 7, buf);
if (ret < 0)
ret = regmap_bulk_read(ds3232->regmap, DS3232_REG_SECONDS, buf, 7);
if (ret)
return ret;
if (ret < 7)
return -EIO;
second = buf[0];
minute = buf[1];
......@@ -159,7 +153,7 @@ static int ds3232_read_time(struct device *dev, struct rtc_time *time)
static int ds3232_set_time(struct device *dev, struct rtc_time *time)
{
struct i2c_client *client = to_i2c_client(dev);
struct ds3232 *ds3232 = dev_get_drvdata(dev);
u8 buf[7];
/* Extract time from rtc_time and load into ds3232*/
......@@ -179,8 +173,7 @@ static int ds3232_set_time(struct device *dev, struct rtc_time *time)
buf[6] = bin2bcd(time->tm_year);
}
return i2c_smbus_write_i2c_block_data(client,
DS3232_REG_SECONDS, 7, buf);
return regmap_bulk_write(ds3232->regmap, DS3232_REG_SECONDS, buf, 7);
}
/*
......@@ -190,24 +183,21 @@ static int ds3232_set_time(struct device *dev, struct rtc_time *time)
*/
static int ds3232_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct i2c_client *client = to_i2c_client(dev);
struct ds3232 *ds3232 = i2c_get_clientdata(client);
struct ds3232 *ds3232 = dev_get_drvdata(dev);
int control, stat;
int ret;
u8 buf[4];
mutex_lock(&ds3232->mutex);
ret = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
if (ret < 0)
ret = regmap_read(ds3232->regmap, DS3232_REG_SR, &stat);
if (ret)
goto out;
stat = ret;
ret = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
if (ret < 0)
ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control);
if (ret)
goto out;
control = ret;
ret = i2c_smbus_read_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
if (ret < 0)
ret = regmap_bulk_read(ds3232->regmap, DS3232_REG_ALARM1, buf, 4);
if (ret)
goto out;
alarm->time.tm_sec = bcd2bin(buf[0] & 0x7F);
......@@ -236,13 +226,12 @@ static int ds3232_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
*/
static int ds3232_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct i2c_client *client = to_i2c_client(dev);
struct ds3232 *ds3232 = i2c_get_clientdata(client);
struct ds3232 *ds3232 = dev_get_drvdata(dev);
int control, stat;
int ret;
u8 buf[4];
if (client->irq <= 0)
if (ds3232->irq <= 0)
return -EINVAL;
mutex_lock(&ds3232->mutex);
......@@ -253,47 +242,45 @@ static int ds3232_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
buf[3] = bin2bcd(alarm->time.tm_mday);
/* clear alarm interrupt enable bit */
ret = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
if (ret < 0)
ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control);
if (ret)
goto out;
control = ret;
control &= ~(DS3232_REG_CR_A1IE | DS3232_REG_CR_A2IE);
ret = i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
if (ret < 0)
ret = regmap_write(ds3232->regmap, DS3232_REG_CR, control);
if (ret)
goto out;
/* clear any pending alarm flag */
ret = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
if (ret < 0)
ret = regmap_read(ds3232->regmap, DS3232_REG_SR, &stat);
if (ret)
goto out;
stat = ret;
stat &= ~(DS3232_REG_SR_A1F | DS3232_REG_SR_A2F);
ret = i2c_smbus_write_byte_data(client, DS3232_REG_SR, stat);
if (ret < 0)
ret = regmap_write(ds3232->regmap, DS3232_REG_SR, stat);
if (ret)
goto out;
ret = i2c_smbus_write_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
ret = regmap_bulk_write(ds3232->regmap, DS3232_REG_ALARM1, buf, 4);
if (alarm->enabled) {
control |= DS3232_REG_CR_A1IE;
ret = i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
ret = regmap_write(ds3232->regmap, DS3232_REG_CR, control);
}
out:
mutex_unlock(&ds3232->mutex);
return ret;
}
static void ds3232_update_alarm(struct i2c_client *client)
static void ds3232_update_alarm(struct device *dev)
{
struct ds3232 *ds3232 = i2c_get_clientdata(client);
struct ds3232 *ds3232 = dev_get_drvdata(dev);
int control;
int ret;
u8 buf[4];
mutex_lock(&ds3232->mutex);
ret = i2c_smbus_read_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
if (ret < 0)
ret = regmap_bulk_read(ds3232->regmap, DS3232_REG_ALARM1, buf, 4);
if (ret)
goto unlock;
buf[0] = bcd2bin(buf[0]) < 0 || (ds3232->rtc->irq_data & RTC_UF) ?
......@@ -305,12 +292,12 @@ static void ds3232_update_alarm(struct i2c_client *client)
buf[3] = bcd2bin(buf[3]) < 0 || (ds3232->rtc->irq_data & RTC_UF) ?
0x80 : buf[3];
ret = i2c_smbus_write_i2c_block_data(client, DS3232_REG_ALARM1, 4, buf);
if (ret < 0)
ret = regmap_bulk_write(ds3232->regmap, DS3232_REG_ALARM1, buf, 4);
if (ret)
goto unlock;
control = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
if (control < 0)
ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control);
if (ret)
goto unlock;
if (ds3232->rtc->irq_data & (RTC_AF | RTC_UF))
......@@ -319,7 +306,7 @@ static void ds3232_update_alarm(struct i2c_client *client)
else
/* disable alarm1 interrupt */
control &= ~(DS3232_REG_CR_A1IE);
i2c_smbus_write_byte_data(client, DS3232_REG_CR, control);
regmap_write(ds3232->regmap, DS3232_REG_CR, control);
unlock:
mutex_unlock(&ds3232->mutex);
......@@ -327,10 +314,9 @@ static void ds3232_update_alarm(struct i2c_client *client)
static int ds3232_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct i2c_client *client = to_i2c_client(dev);
struct ds3232 *ds3232 = i2c_get_clientdata(client);
struct ds3232 *ds3232 = dev_get_drvdata(dev);
if (client->irq <= 0)
if (ds3232->irq <= 0)
return -EINVAL;
if (enabled)
......@@ -338,14 +324,14 @@ static int ds3232_alarm_irq_enable(struct device *dev, unsigned int enabled)
else
ds3232->rtc->irq_data &= ~RTC_AF;
ds3232_update_alarm(client);
ds3232_update_alarm(dev);
return 0;
}
static irqreturn_t ds3232_irq(int irq, void *dev_id)
{
struct i2c_client *client = dev_id;
struct ds3232 *ds3232 = i2c_get_clientdata(client);
struct device *dev = dev_id;
struct ds3232 *ds3232 = dev_get_drvdata(dev);
disable_irq_nosync(irq);
......@@ -363,34 +349,33 @@ static irqreturn_t ds3232_irq(int irq, void *dev_id)
static void ds3232_work(struct work_struct *work)
{
struct ds3232 *ds3232 = container_of(work, struct ds3232, work);
struct i2c_client *client = ds3232->client;
int ret;
int stat, control;
mutex_lock(&ds3232->mutex);
stat = i2c_smbus_read_byte_data(client, DS3232_REG_SR);
if (stat < 0)
ret = regmap_read(ds3232->regmap, DS3232_REG_SR, &stat);
if (ret)
goto unlock;
if (stat & DS3232_REG_SR_A1F) {
control = i2c_smbus_read_byte_data(client, DS3232_REG_CR);
if (control < 0) {
ret = regmap_read(ds3232->regmap, DS3232_REG_CR, &control);
if (ret) {
pr_warn("Read Control Register error - Disable IRQ%d\n",
client->irq);
ds3232->irq);
} else {
/* disable alarm1 interrupt */
control &= ~(DS3232_REG_CR_A1IE);
i2c_smbus_write_byte_data(client, DS3232_REG_CR,
control);
regmap_write(ds3232->regmap, DS3232_REG_CR, control);
/* clear the alarm pend flag */
stat &= ~DS3232_REG_SR_A1F;
i2c_smbus_write_byte_data(client, DS3232_REG_SR, stat);
regmap_write(ds3232->regmap, DS3232_REG_SR, stat);
rtc_update_irq(ds3232->rtc, 1, RTC_AF | RTC_IRQF);
if (!ds3232->exiting)
enable_irq(client->irq);
enable_irq(ds3232->irq);
}
}
......@@ -406,49 +391,53 @@ static const struct rtc_class_ops ds3232_rtc_ops = {
.alarm_irq_enable = ds3232_alarm_irq_enable,
};
static int ds3232_probe(struct i2c_client *client,
const struct i2c_device_id *id)
static int ds3232_probe(struct device *dev, struct regmap *regmap, int irq,
const char *name)
{
struct ds3232 *ds3232;
int ret;
ds3232 = devm_kzalloc(&client->dev, sizeof(struct ds3232), GFP_KERNEL);
ds3232 = devm_kzalloc(dev, sizeof(*ds3232), GFP_KERNEL);
if (!ds3232)
return -ENOMEM;
ds3232->client = client;
i2c_set_clientdata(client, ds3232);
ds3232->regmap = regmap;
ds3232->irq = irq;
ds3232->dev = dev;
dev_set_drvdata(dev, ds3232);
INIT_WORK(&ds3232->work, ds3232_work);
mutex_init(&ds3232->mutex);
ret = ds3232_check_rtc_status(client);
ret = ds3232_check_rtc_status(dev);
if (ret)
return ret;
if (client->irq > 0) {
ret = devm_request_irq(&client->dev, client->irq, ds3232_irq,
IRQF_SHARED, "ds3232", client);
if (ds3232->irq > 0) {
ret = devm_request_irq(dev, ds3232->irq, ds3232_irq,
IRQF_SHARED, name, dev);
if (ret) {
dev_err(&client->dev, "unable to request IRQ\n");
}
device_init_wakeup(&client->dev, 1);
ds3232->irq = 0;
dev_err(dev, "unable to request IRQ\n");
} else
device_init_wakeup(dev, 1);
}
ds3232->rtc = devm_rtc_device_register(&client->dev, client->name,
&ds3232_rtc_ops, THIS_MODULE);
ds3232->rtc = devm_rtc_device_register(dev, name, &ds3232_rtc_ops,
THIS_MODULE);
return PTR_ERR_OR_ZERO(ds3232->rtc);
}
static int ds3232_remove(struct i2c_client *client)
static int ds3232_remove(struct device *dev)
{
struct ds3232 *ds3232 = i2c_get_clientdata(client);
struct ds3232 *ds3232 = dev_get_drvdata(dev);
if (client->irq > 0) {
if (ds3232->irq > 0) {
mutex_lock(&ds3232->mutex);
ds3232->exiting = 1;
mutex_unlock(&ds3232->mutex);
devm_free_irq(&client->dev, client->irq, client);
devm_free_irq(dev, ds3232->irq, dev);
cancel_work_sync(&ds3232->work);
}
......@@ -459,11 +448,10 @@ static int ds3232_remove(struct i2c_client *client)
static int ds3232_suspend(struct device *dev)
{
struct ds3232 *ds3232 = dev_get_drvdata(dev);
struct i2c_client *client = to_i2c_client(dev);
if (device_can_wakeup(dev)) {
ds3232->suspended = true;
if (irq_set_irq_wake(client->irq, 1)) {
if (irq_set_irq_wake(ds3232->irq, 1)) {
dev_warn_once(dev, "Cannot set wakeup source\n");
ds3232->suspended = false;
}
......@@ -475,7 +463,6 @@ static int ds3232_suspend(struct device *dev)
static int ds3232_resume(struct device *dev)
{
struct ds3232 *ds3232 = dev_get_drvdata(dev);
struct i2c_client *client = to_i2c_client(dev);
if (ds3232->suspended) {
ds3232->suspended = false;
......@@ -483,7 +470,7 @@ static int ds3232_resume(struct device *dev)
/* Clear the hardware alarm pend flag */
schedule_work(&ds3232->work);
irq_set_irq_wake(client->irq, 0);
irq_set_irq_wake(ds3232->irq, 0);
}
return 0;
......@@ -494,6 +481,30 @@ static const struct dev_pm_ops ds3232_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(ds3232_suspend, ds3232_resume)
};
static int ds3232_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct regmap *regmap;
static const struct regmap_config config = {
.reg_bits = 8,
.val_bits = 8,
};
regmap = devm_regmap_init_i2c(client, &config);
if (IS_ERR(regmap)) {
dev_err(&client->dev, "%s: regmap allocation failed: %ld\n",
__func__, PTR_ERR(regmap));
return PTR_ERR(regmap);
}
return ds3232_probe(&client->dev, regmap, client->irq, client->name);
}
static int ds3232_i2c_remove(struct i2c_client *client)
{
return ds3232_remove(&client->dev);
}
static const struct i2c_device_id ds3232_id[] = {
{ "ds3232", 0 },
{ }
......@@ -505,11 +516,10 @@ static struct i2c_driver ds3232_driver = {
.name = "rtc-ds3232",
.pm = &ds3232_pm_ops,
},
.probe = ds3232_probe,
.remove = ds3232_remove,
.probe = ds3232_i2c_probe,
.remove = ds3232_i2c_remove,
.id_table = ds3232_id,
};
module_i2c_driver(ds3232_driver);
MODULE_AUTHOR("Srikanth Srinivasan <srikanth.srinivasan@freescale.com>");
......
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