drm/mgag200: Inline mgag200_i2c_init()

The function mgag200_i2c_init() is an internal helper that sets
up the i2c data structure. Inline its code into the only caller.
Rearrange the individual steps to separate among i2c algorithm,
adapter and fields in struct mga_i2c_chan.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240513125620.6337-6-tzimmermann@suse.de

drivers/gpu/drm/mgag200/mgag200_i2c.c

@@ -96,54 +96,50 @@ static void mgag200_i2c_release(struct drm_device *dev, void *res)
 	i2c_del_adapter(&i2c->adapter);
 }
 
-static int mgag200_i2c_init(struct mga_device *mdev, struct mga_i2c_chan *i2c)
+struct i2c_adapter *mgag200_ddc_create(struct mga_device *mdev)
 {
 	struct drm_device *dev = &mdev->base;
 	const struct mgag200_device_info *info = mdev->info;
+	struct mga_i2c_chan *i2c;
+	struct i2c_algo_bit_data *bit;
+	struct i2c_adapter *adapter;
 	int ret;
 
+	i2c = drmm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL);
+	if (!i2c)
+		return ERR_PTR(-ENOMEM);
+
 	WREG_DAC(MGA1064_GEN_IO_CTL2, 1);
 	WREG_DAC(MGA1064_GEN_IO_DATA, 0xff);
 	WREG_DAC(MGA1064_GEN_IO_CTL, 0);
 
+	i2c->mdev = mdev;
 	i2c->data = BIT(info->i2c.data_bit);
 	i2c->clock = BIT(info->i2c.clock_bit);
-	i2c->adapter.owner = THIS_MODULE;
-	i2c->adapter.dev.parent = dev->dev;
-	i2c->mdev = mdev;
-	i2c_set_adapdata(&i2c->adapter, i2c);
-	snprintf(i2c->adapter.name, sizeof(i2c->adapter.name), "mga i2c");
-
-	i2c->adapter.algo_data = &i2c->bit;
 
-	i2c->bit.udelay = 10;
-	i2c->bit.timeout = usecs_to_jiffies(2200);
-	i2c->bit.data = i2c;
-	i2c->bit.setsda		= mga_gpio_setsda;
-	i2c->bit.setscl		= mga_gpio_setscl;
-	i2c->bit.getsda		= mga_gpio_getsda;
-	i2c->bit.getscl		= mga_gpio_getscl;
-
-	ret = i2c_bit_add_bus(&i2c->adapter);
+	bit = &i2c->bit;
+	bit->data = i2c;
+	bit->setsda = mga_gpio_setsda;
+	bit->setscl = mga_gpio_setscl;
+	bit->getsda = mga_gpio_getsda;
+	bit->getscl = mga_gpio_getscl;
+	bit->udelay = 10;
+	bit->timeout = usecs_to_jiffies(2200);
+
+	adapter = &i2c->adapter;
+	adapter->owner = THIS_MODULE;
+	adapter->algo_data = bit;
+	adapter->dev.parent = dev->dev;
+	snprintf(adapter->name, sizeof(adapter->name), "mga i2c");
+	i2c_set_adapdata(adapter, i2c);
+
+	ret = i2c_bit_add_bus(adapter);
 	if (ret)
-		return ret;
-
-	return drmm_add_action_or_reset(dev, mgag200_i2c_release, i2c);
-}
-
-struct i2c_adapter *mgag200_ddc_create(struct mga_device *mdev)
-{
-	struct mga_i2c_chan *i2c;
-	struct drm_device *dev = &mdev->base;
-	int ret;
-
-	i2c = drmm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL);
-	if (!i2c)
-		return ERR_PTR(-ENOMEM);
+		return ERR_PTR(ret);
 
-	ret = mgag200_i2c_init(mdev, i2c);
+	ret = drmm_add_action_or_reset(dev, mgag200_i2c_release, i2c);
 	if (ret)
 		return ERR_PTR(ret);
 
-	return &i2c->adapter;
+	return adapter;
 }