[PATCH 0/2] at24: use devm_i2c_new_dummy_device()

[PATCH 0/2] at24: use devm_i2c_new_dummy_device()

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

I see Linus pulled the new helper, so here's a patch using it in at24
and also a small code tweak for better readability.

Bartosz Golaszewski (2):
  eeprom: at24: use devm_i2c_new_dummy_device()
  eeprom: at24: drop unnecessary label

 drivers/misc/eeprom/at24.c | 65 ++++++++++++--------------------------
 1 file changed, 21 insertions(+), 44 deletions(-)

-- 
2.21.0

[PATCH 1/2] eeprom: at24: use devm_i2c_new_dummy_device()

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Now that it's upstream, use the resource managed version
of i2c_new_dummy().

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 drivers/misc/eeprom/at24.c | 28 ++++++----------------------
 1 file changed, 6 insertions(+), 22 deletions(-)

diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 63aa541c9608..9ea196f0749f 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -507,14 +507,6 @@ static const struct at24_chip_data *at24_get_chip_data(struct device *dev)
 	return cdata;
 }
 
-static void at24_remove_dummy_clients(struct at24_data *at24)
-{
-	int i;
-
-	for (i = 1; i < at24->num_addresses; i++)
-		i2c_unregister_device(at24->client[i].client);
-}
-
 static int at24_make_dummy_client(struct at24_data *at24, unsigned int index,
 				  struct regmap_config *regmap_config)
 {
@@ -527,8 +519,8 @@ static int at24_make_dummy_client(struct at24_data *at24, unsigned int index,
 	dev = &base_client->dev;
 	addr = base_client->addr + index;
 
-	dummy_client = i2c_new_dummy(base_client->adapter,
-				     base_client->addr + index);
+	dummy_client = devm_i2c_new_dummy_device(dev, base_client->adapter,
+						 base_client->addr + index);
 	if (!dummy_client) {
 		dev_err(dev, "address 0x%02x unavailable\n", addr);
 		return -EADDRINUSE;
@@ -693,10 +685,8 @@ static int at24_probe(struct i2c_client *client)
 	/* use dummy devices for multiple-address chips */
 	for (i = 1; i < num_addresses; i++) {
 		err = at24_make_dummy_client(at24, i, &regmap_config);
-		if (err) {
-			at24_remove_dummy_clients(at24);
+		if (err)
 			return err;
-		}
 	}
 
 	i2c_set_clientdata(client, at24);
@@ -713,7 +703,7 @@ static int at24_probe(struct i2c_client *client)
 	pm_runtime_idle(dev);
 	if (err) {
 		err = -ENODEV;
-		goto err_clients;
+		goto err_runtime_pm;
 	}
 
 	nvmem_config.name = dev_name(dev);
@@ -733,7 +723,7 @@ static int at24_probe(struct i2c_client *client)
 	at24->nvmem = devm_nvmem_register(dev, &nvmem_config);
 	if (IS_ERR(at24->nvmem)) {
 		err = PTR_ERR(at24->nvmem);
-		goto err_clients;
+		goto err_runtime_pm;
 	}
 
 	dev_info(dev, "%u byte %s EEPROM, %s, %u bytes/write\n",
@@ -742,8 +732,7 @@ static int at24_probe(struct i2c_client *client)
 
 	return 0;
 
-err_clients:
-	at24_remove_dummy_clients(at24);
+err_runtime_pm:
 	pm_runtime_disable(dev);
 
 	return err;
@@ -751,11 +740,6 @@ static int at24_probe(struct i2c_client *client)
 
 static int at24_remove(struct i2c_client *client)
 {
-	struct at24_data *at24;
-
-	at24 = i2c_get_clientdata(client);
-
-	at24_remove_dummy_clients(at24);
 	pm_runtime_disable(&client->dev);
 	pm_runtime_set_suspended(&client->dev);
 
-- 
2.21.0

[PATCH 2/2] eeprom: at24: drop unnecessary label

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

If we move the nvmem registration above the pm enable calls and the
test read, we can drop the error label and make the code more readable
as there's now only a single place where we must call
pm_runtime_disable() in error path.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
---
 drivers/misc/eeprom/at24.c | 43 ++++++++++++++++----------------------
 1 file changed, 18 insertions(+), 25 deletions(-)

diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index 9ea196f0749f..0bc0a45fb98e 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/drivers/misc/eeprom/at24.c
@@ -689,23 +689,6 @@ static int at24_probe(struct i2c_client *client)
 			return err;
 	}
 
-	i2c_set_clientdata(client, at24);
-
-	/* enable runtime pm */
-	pm_runtime_set_active(dev);
-	pm_runtime_enable(dev);
-
-	/*
-	 * Perform a one-byte test read to verify that the
-	 * chip is functional.
-	 */
-	err = at24_read(at24, 0, &test_byte, 1);
-	pm_runtime_idle(dev);
-	if (err) {
-		err = -ENODEV;
-		goto err_runtime_pm;
-	}
-
 	nvmem_config.name = dev_name(dev);
 	nvmem_config.dev = dev;
 	nvmem_config.read_only = !writable;
@@ -721,9 +704,24 @@ static int at24_probe(struct i2c_client *client)
 	nvmem_config.size = byte_len;
 
 	at24->nvmem = devm_nvmem_register(dev, &nvmem_config);
-	if (IS_ERR(at24->nvmem)) {
-		err = PTR_ERR(at24->nvmem);
-		goto err_runtime_pm;
+	if (IS_ERR(at24->nvmem))
+		return PTR_ERR(at24->nvmem);
+
+	i2c_set_clientdata(client, at24);
+
+	/* enable runtime pm */
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
+	/*
+	 * Perform a one-byte test read to verify that the
+	 * chip is functional.
+	 */
+	err = at24_read(at24, 0, &test_byte, 1);
+	pm_runtime_idle(dev);
+	if (err) {
+		pm_runtime_disable(dev);
+		return -ENODEV;
 	}
 
 	dev_info(dev, "%u byte %s EEPROM, %s, %u bytes/write\n",
@@ -731,11 +729,6 @@ static int at24_probe(struct i2c_client *client)
 		 writable ? "writable" : "read-only", at24->write_max);
 
 	return 0;
-
-err_runtime_pm:
-	pm_runtime_disable(dev);
-
-	return err;
 }
 
 static int at24_remove(struct i2c_client *client)
-- 
2.21.0

Re: [PATCH 1/2] eeprom: at24: use devm_i2c_new_dummy_device()

[Wolfram Sang]

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> Now that it's upstream, use the resource managed version
> of i2c_new_dummy().

That was fast :)

> -	dummy_client = i2c_new_dummy(base_client->adapter,
> -				     base_client->addr + index);
> +	dummy_client = devm_i2c_new_dummy_device(dev, base_client->adapter,
> +						 base_client->addr + index);
>  	if (!dummy_client) {

Oh well, the confusion starts already :/ devm_i2c_new_dummy_device()
returns an ERR_PTR.


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Re: [PATCH 1/2] eeprom: at24: use devm_i2c_new_dummy_device()

[Bartosz Golaszewski]

niedz., 19 maj 2019 o 22:52 Wolfram Sang <wsa@the-dreams.de> napisał(a):
>
>
> > Now that it's upstream, use the resource managed version
> > of i2c_new_dummy().
>
> That was fast :)
>
> > -     dummy_client = i2c_new_dummy(base_client->adapter,
> > -                                  base_client->addr + index);
> > +     dummy_client = devm_i2c_new_dummy_device(dev, base_client->adapter,
> > +                                              base_client->addr + index);
> >       if (!dummy_client) {
>
> Oh well, the confusion starts already :/ devm_i2c_new_dummy_device()
> returns an ERR_PTR.
>

Ugh, sorry for that, especially since I followed the discussion on
that series. :(

I should not be sending out patches late on Sundays I guess.

Bart