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Diffstat (limited to 'drivers/rtc/rtc-ds3232.c')
-rw-r--r--drivers/rtc/rtc-ds3232.c216
1 files changed, 113 insertions, 103 deletions
diff --git a/drivers/rtc/rtc-ds3232.c b/drivers/rtc/rtc-ds3232.c
index 4e99ace66f74..5791f996fa32 100644
--- a/drivers/rtc/rtc-ds3232.c
+++ b/drivers/rtc/rtc-ds3232.c
@@ -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 @@ out:
*/
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 @@ unlock:
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>");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-15 16:53:47 +0100