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path: root/drivers/rtc/rtc-ds1307.c
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Diffstat (limited to 'drivers/rtc/rtc-ds1307.c')
-rw-r--r--drivers/rtc/rtc-ds1307.c120
1 files changed, 56 insertions, 64 deletions
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 6e76de185..a705e6490 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -11,14 +11,17 @@
* published by the Free Software Foundation.
*/
-#include <linux/module.h>
+#include <linux/bcd.h>
+#include <linux/i2c.h>
#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/pm_wakeirq.h>
+#include <linux/rtc/ds1307.h>
+#include <linux/rtc.h>
#include <linux/slab.h>
-#include <linux/i2c.h>
#include <linux/string.h>
-#include <linux/rtc.h>
-#include <linux/bcd.h>
-#include <linux/rtc/ds1307.h>
/*
* We can't determine type by probing, but if we expect pre-Linux code
@@ -114,7 +117,7 @@ struct ds1307 {
#define HAS_ALARM 1 /* bit 1 == irq claimed */
struct i2c_client *client;
struct rtc_device *rtc;
- struct work_struct work;
+ int wakeirq;
s32 (*read_block_data)(const struct i2c_client *client, u8 command,
u8 length, u8 *values);
s32 (*write_block_data)(const struct i2c_client *client, u8 command,
@@ -311,27 +314,17 @@ static s32 ds1307_native_smbus_read_block_data(const struct i2c_client *client,
/*----------------------------------------------------------------------*/
/*
- * The IRQ logic includes a "real" handler running in IRQ context just
- * long enough to schedule this workqueue entry. We need a task context
- * to talk to the RTC, since I2C I/O calls require that; and disable the
- * IRQ until we clear its status on the chip, so that this handler can
- * work with any type of triggering (not just falling edge).
- *
* The ds1337 and ds1339 both have two alarms, but we only use the first
* one (with a "seconds" field). For ds1337 we expect nINTA is our alarm
* signal; ds1339 chips have only one alarm signal.
*/
-static void ds1307_work(struct work_struct *work)
+static irqreturn_t ds1307_irq(int irq, void *dev_id)
{
- struct ds1307 *ds1307;
- struct i2c_client *client;
- struct mutex *lock;
+ struct i2c_client *client = dev_id;
+ struct ds1307 *ds1307 = i2c_get_clientdata(client);
+ struct mutex *lock = &ds1307->rtc->ops_lock;
int stat, control;
- ds1307 = container_of(work, struct ds1307, work);
- client = ds1307->client;
- lock = &ds1307->rtc->ops_lock;
-
mutex_lock(lock);
stat = i2c_smbus_read_byte_data(client, DS1337_REG_STATUS);
if (stat < 0)
@@ -352,18 +345,8 @@ static void ds1307_work(struct work_struct *work)
}
out:
- if (test_bit(HAS_ALARM, &ds1307->flags))
- enable_irq(client->irq);
mutex_unlock(lock);
-}
-static irqreturn_t ds1307_irq(int irq, void *dev_id)
-{
- struct i2c_client *client = dev_id;
- struct ds1307 *ds1307 = i2c_get_clientdata(client);
-
- disable_irq_nosync(irq);
- schedule_work(&ds1307->work);
return IRQ_HANDLED;
}
@@ -634,13 +617,14 @@ static const struct rtc_class_ops ds13xx_rtc_ops = {
MCP794XX_BIT_ALMX_C1 | \
MCP794XX_BIT_ALMX_C2)
-static void mcp794xx_work(struct work_struct *work)
+static irqreturn_t mcp794xx_irq(int irq, void *dev_id)
{
- struct ds1307 *ds1307 = container_of(work, struct ds1307, work);
- struct i2c_client *client = ds1307->client;
+ struct i2c_client *client = dev_id;
+ struct ds1307 *ds1307 = i2c_get_clientdata(client);
+ struct mutex *lock = &ds1307->rtc->ops_lock;
int reg, ret;
- mutex_lock(&ds1307->rtc->ops_lock);
+ mutex_lock(lock);
/* Check and clear alarm 0 interrupt flag. */
reg = i2c_smbus_read_byte_data(client, MCP794XX_REG_ALARM0_CTRL);
@@ -665,9 +649,9 @@ static void mcp794xx_work(struct work_struct *work)
rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
out:
- if (test_bit(HAS_ALARM, &ds1307->flags))
- enable_irq(client->irq);
- mutex_unlock(&ds1307->rtc->ops_lock);
+ mutex_unlock(lock);
+
+ return IRQ_HANDLED;
}
static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t)
@@ -798,13 +782,6 @@ ds1307_nvram_read(struct file *filp, struct kobject *kobj,
client = kobj_to_i2c_client(kobj);
ds1307 = i2c_get_clientdata(client);
- if (unlikely(off >= ds1307->nvram->size))
- return 0;
- if ((off + count) > ds1307->nvram->size)
- count = ds1307->nvram->size - off;
- if (unlikely(!count))
- return count;
-
result = ds1307->read_block_data(client, ds1307->nvram_offset + off,
count, buf);
if (result < 0)
@@ -824,13 +801,6 @@ ds1307_nvram_write(struct file *filp, struct kobject *kobj,
client = kobj_to_i2c_client(kobj);
ds1307 = i2c_get_clientdata(client);
- if (unlikely(off >= ds1307->nvram->size))
- return -EFBIG;
- if ((off + count) > ds1307->nvram->size)
- count = ds1307->nvram->size - off;
- if (unlikely(!count))
- return count;
-
result = ds1307->write_block_data(client, ds1307->nvram_offset + off,
count, buf);
if (result < 0) {
@@ -896,6 +866,8 @@ static int ds1307_probe(struct i2c_client *client,
bool want_irq = false;
unsigned char *buf;
struct ds1307_platform_data *pdata = dev_get_platdata(&client->dev);
+ irq_handler_t irq_handler = ds1307_irq;
+
static const int bbsqi_bitpos[] = {
[ds_1337] = 0,
[ds_1339] = DS1339_BIT_BBSQI,
@@ -962,8 +934,6 @@ static int ds1307_probe(struct i2c_client *client,
* running on Vbackup (BBSQI/BBSQW)
*/
if (ds1307->client->irq > 0 && chip->alarm) {
- INIT_WORK(&ds1307->work, ds1307_work);
-
ds1307->regs[0] |= DS1337_BIT_INTCN
| bbsqi_bitpos[ds1307->type];
ds1307->regs[0] &= ~(DS1337_BIT_A2IE | DS1337_BIT_A1IE);
@@ -1053,7 +1023,7 @@ static int ds1307_probe(struct i2c_client *client,
case mcp794xx:
rtc_ops = &mcp794xx_rtc_ops;
if (ds1307->client->irq > 0 && chip->alarm) {
- INIT_WORK(&ds1307->work, mcp794xx_work);
+ irq_handler = mcp794xx_irq;
want_irq = true;
}
break;
@@ -1176,18 +1146,43 @@ read_rtc:
}
if (want_irq) {
- err = request_irq(client->irq, ds1307_irq, IRQF_SHARED,
- ds1307->rtc->name, client);
+ struct device_node *node = client->dev.of_node;
+
+ err = devm_request_threaded_irq(&client->dev,
+ client->irq, NULL, irq_handler,
+ IRQF_SHARED | IRQF_ONESHOT,
+ ds1307->rtc->name, client);
if (err) {
client->irq = 0;
dev_err(&client->dev, "unable to request IRQ!\n");
- } else {
+ goto no_irq;
+ }
+
+ set_bit(HAS_ALARM, &ds1307->flags);
+ dev_dbg(&client->dev, "got IRQ %d\n", client->irq);
+
+ /* Currently supported by OF code only! */
+ if (!node)
+ goto no_irq;
+
+ err = of_irq_get(node, 1);
+ if (err <= 0) {
+ if (err == -EPROBE_DEFER)
+ goto exit;
+ goto no_irq;
+ }
+ ds1307->wakeirq = err;
- set_bit(HAS_ALARM, &ds1307->flags);
- dev_dbg(&client->dev, "got IRQ %d\n", client->irq);
+ err = dev_pm_set_dedicated_wake_irq(&client->dev,
+ ds1307->wakeirq);
+ if (err) {
+ dev_err(&client->dev, "unable to setup wakeIRQ %d!\n",
+ err);
+ goto exit;
}
}
+no_irq:
if (chip->nvram_size) {
ds1307->nvram = devm_kzalloc(&client->dev,
@@ -1231,10 +1226,8 @@ static int ds1307_remove(struct i2c_client *client)
{
struct ds1307 *ds1307 = i2c_get_clientdata(client);
- if (test_and_clear_bit(HAS_ALARM, &ds1307->flags)) {
- free_irq(client->irq, client);
- cancel_work_sync(&ds1307->work);
- }
+ if (ds1307->wakeirq)
+ dev_pm_clear_wake_irq(&client->dev);
if (test_and_clear_bit(HAS_NVRAM, &ds1307->flags))
sysfs_remove_bin_file(&client->dev.kobj, ds1307->nvram);
@@ -1245,7 +1238,6 @@ static int ds1307_remove(struct i2c_client *client)
static struct i2c_driver ds1307_driver = {
.driver = {
.name = "rtc-ds1307",
- .owner = THIS_MODULE,
},
.probe = ds1307_probe,
.remove = ds1307_remove,
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-29 23:54:53 +0000