* [PATCH] eeprom: at24: fix I2C device selection for runtime PM
@ 2017-12-01 18:04 Sven Van Asbroeck
2017-12-01 18:35 ` Sven Van Asbroeck
0 siblings, 1 reply; 2+ messages in thread
From: Sven Van Asbroeck @ 2017-12-01 18:04 UTC (permalink / raw)
To: svendev, linux-kernel, linux-i2c; +Cc: divagar.mohandass, sakari.ailus, brgl
From: Sakari Ailus <sakari.ailus@linux.intel.com>
The at24 driver creates dummy I2C devices to access offsets in the chip
that are outside the area supported using a single I2C address. It is not
meaningful to use runtime PM to such devices; the system firmware (ACPI)
does not know about these devices nor runtime PM was enabled for them.
Always use the real device instead of the dummy ones.
Fixes: 98e8201039af ("eeprom: at24: enable runtime pm support")
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Tested-by: Sven Van Asbroeck on a 24AA16/24LC16B <svendev@arcx.com>
[Bartosz: rebased on top of previous fixes for 4.15, tweaked the
commit message]
[Sven: fixed Bartosz's rebase]
Signed-off-by: Sven Van Asbroeck <svendev@arcx.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
---
drivers/misc/eeprom/at24.c | 24 ++++++++++--------------
1 file changed, 10 insertions(+), 14 deletions(-)
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index e0b4b36..07b6b61 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -561,18 +561,16 @@ static ssize_t at24_eeprom_write_i2c(struct at24_data *at24, const char *buf,
static int at24_read(void *priv, unsigned int off, void *val, size_t count)
{
struct at24_data *at24 = priv;
- struct i2c_client *client;
+ struct device *dev = &at24->client[0]->dev;
char *buf = val;
int ret;
if (unlikely(!count))
return count;
- client = at24_translate_offset(at24, &off);
-
- ret = pm_runtime_get_sync(&client->dev);
+ ret = pm_runtime_get_sync(dev);
if (ret < 0) {
- pm_runtime_put_noidle(&client->dev);
+ pm_runtime_put_noidle(dev);
return ret;
}
@@ -588,7 +586,7 @@ static int at24_read(void *priv, unsigned int off, void *val, size_t count)
status = at24->read_func(at24, buf, off, count);
if (status < 0) {
mutex_unlock(&at24->lock);
- pm_runtime_put(&client->dev);
+ pm_runtime_put(dev);
return status;
}
buf += status;
@@ -598,7 +596,7 @@ static int at24_read(void *priv, unsigned int off, void *val, size_t count)
mutex_unlock(&at24->lock);
- pm_runtime_put(&client->dev);
+ pm_runtime_put(dev);
return 0;
}
@@ -606,18 +604,16 @@ static int at24_read(void *priv, unsigned int off, void *val, size_t count)
static int at24_write(void *priv, unsigned int off, void *val, size_t count)
{
struct at24_data *at24 = priv;
- struct i2c_client *client;
+ struct device *dev = &at24->client[0]->dev;
char *buf = val;
int ret;
if (unlikely(!count))
return -EINVAL;
- client = at24_translate_offset(at24, &off);
-
- ret = pm_runtime_get_sync(&client->dev);
+ ret = pm_runtime_get_sync(dev);
if (ret < 0) {
- pm_runtime_put_noidle(&client->dev);
+ pm_runtime_put_noidle(dev);
return ret;
}
@@ -633,7 +629,7 @@ static int at24_write(void *priv, unsigned int off, void *val, size_t count)
status = at24->write_func(at24, buf, off, count);
if (status < 0) {
mutex_unlock(&at24->lock);
- pm_runtime_put(&client->dev);
+ pm_runtime_put(dev);
return status;
}
buf += status;
@@ -643,7 +639,7 @@ static int at24_write(void *priv, unsigned int off, void *val, size_t count)
mutex_unlock(&at24->lock);
- pm_runtime_put(&client->dev);
+ pm_runtime_put(dev);
return 0;
}
--
1.9.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
end of thread, other threads:[~2017-12-01 18:35 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-12-01 18:04 [PATCH] eeprom: at24: fix I2C device selection for runtime PM Sven Van Asbroeck
2017-12-01 18:35 ` Sven Van Asbroeck
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).