gpio: max732x: use i2c_new_dummy_device()

We now have a resource managed version of i2c_new_dummy_device() that
also returns an actual error code instead of a NULL-pointer. Use it
in the max732x GPIO driver and simplify code in the process.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

diff --git a/drivers/gpio/gpio-max732x.c b/drivers/gpio/gpio-max732x.c
index f03cb0b..7fd1bdf 100644 (file)
--- a/drivers/gpio/gpio-max732x.c
+++ b/drivers/gpio/gpio-max732x.c
@@ -652,12 +652,12 @@ static int max732x_probe(struct i2c_client *client,
        case 0x60:
                chip->client_group_a = client;
                if (nr_port > 8) {
-                       c = i2c_new_dummy(client->adapter, addr_b);
-                       if (!c) {
+                       c = devm_i2c_new_dummy_device(&client->dev,
+                                                     client->adapter, addr_b);
+                       if (IS_ERR(c)) {
                                dev_err(&client->dev,
                                        "Failed to allocate I2C device\n");
-                               ret = -ENODEV;
-                               goto out_failed;
+                               return PTR_ERR(c);
                        }
                        chip->client_group_b = chip->client_dummy = c;
                }
@@ -665,12 +665,12 @@ static int max732x_probe(struct i2c_client *client,
        case 0x50:
                chip->client_group_b = client;
                if (nr_port > 8) {
-                       c = i2c_new_dummy(client->adapter, addr_a);
-                       if (!c) {
+                       c = devm_i2c_new_dummy_device(&client->dev,
+                                                     client->adapter, addr_a);
+                       if (IS_ERR(c)) {
                                dev_err(&client->dev,
                                        "Failed to allocate I2C device\n");
-                               ret = -ENODEV;
-                               goto out_failed;
+                               return PTR_ERR(c);
                        }
                        chip->client_group_a = chip->client_dummy = c;
                }
@@ -678,36 +678,34 @@ static int max732x_probe(struct i2c_client *client,
        default:
                dev_err(&client->dev, "invalid I2C address specified %02x\n",
                                client->addr);
-               ret = -EINVAL;
-               goto out_failed;
+               return -EINVAL;
        }
 
        if (nr_port > 8 && !chip->client_dummy) {
                dev_err(&client->dev,
                        "Failed to allocate second group I2C device\n");
-               ret = -ENODEV;
-               goto out_failed;
+               return -ENODEV;
        }
 
        mutex_init(&chip->lock);
 
        ret = max732x_readb(chip, is_group_a(chip, 0), &chip->reg_out[0]);
        if (ret)
-               goto out_failed;
+               return ret;
        if (nr_port > 8) {
                ret = max732x_readb(chip, is_group_a(chip, 8), &chip->reg_out[1]);
                if (ret)
-                       goto out_failed;
+                       return ret;
        }
 
        ret = gpiochip_add_data(&chip->gpio_chip, chip);
        if (ret)
-               goto out_failed;
+               return ret;
 
        ret = max732x_irq_setup(chip, id);
        if (ret) {
                gpiochip_remove(&chip->gpio_chip);
-               goto out_failed;
+               return ret;
        }
 
        if (pdata && pdata->setup) {
@@ -719,10 +717,6 @@ static int max732x_probe(struct i2c_client *client,
 
        i2c_set_clientdata(client, chip);
        return 0;
-
-out_failed:
-       i2c_unregister_device(chip->client_dummy);
-       return ret;
 }
 
 static int max732x_remove(struct i2c_client *client)
@@ -744,9 +738,6 @@ static int max732x_remove(struct i2c_client *client)
 
        gpiochip_remove(&chip->gpio_chip);
 
-       /* unregister any dummy i2c_client */
-       i2c_unregister_device(chip->client_dummy);
-
        return 0;
 }