The simple-encoder helpers initialize an encoder with an empty
implementation. This covers the requirements of most of the existing
DRM drivers. A call to drm_simple_encoder_create() allocates and
initializes an encoder instance, a call to drm_simple_encoder_init()
initializes a pre-allocated instance.
Signed-off-by: Thomas Zimmermann <tzimmerm...@suse.de>
---
drivers/gpu/drm/drm_encoder.c | 116 ++++++++++++++++++++++++++++++++++
include/drm/drm_encoder.h | 10 +++
2 files changed, 126 insertions(+)
diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c
index ffe691a1bf34..1a65cab1f310 100644
--- a/drivers/gpu/drm/drm_encoder.c
+++ b/drivers/gpu/drm/drm_encoder.c
@@ -178,6 +178,122 @@ int drm_encoder_init(struct drm_device *dev,
}
EXPORT_SYMBOL(drm_encoder_init);
+static const struct drm_encoder_funcs drm_simple_encoder_funcs_cleanup = {
+ .destroy = drm_encoder_cleanup,
+};
+
+/**
+ * drm_simple_encoder_init - Init a preallocated encoder
+ * @dev: drm device
+ * @funcs: callbacks for this encoder
+ * @encoder_type: user visible type of the encoder
+ * @name: printf style format string for the encoder name, or NULL
+ * for default name
+ *
+ * Initialises a preallocated encoder that has no further functionality. The
+ * encoder will be released automatically.
+ *
+ * Returns:
+ * Zero on success, error code on failure.
+ */
+int drm_simple_encoder_init(struct drm_device *dev,
+ struct drm_encoder *encoder,
+ int encoder_type, const char *name, ...)
+{
+ char *namestr = NULL;
+ int ret;
+
+ if (name) {
+ va_list ap;
+
+ va_start(ap, name);
+ namestr = kvasprintf(GFP_KERNEL, name, ap);
+ va_end(ap);
+ if (!namestr)
+ return -ENOMEM;
+ }
+
+ ret = __drm_encoder_init(dev, encoder,
+ &drm_simple_encoder_funcs_cleanup,
+ encoder_type, namestr);
+ if (ret)
+ goto err_kfree;
+
+ return 0;
+
+err_kfree:
+ if (name)
+ kfree(namestr);
+ return ret;
+}
+EXPORT_SYMBOL(drm_simple_encoder_init);
+
+static void drm_encoder_destroy(struct drm_encoder *encoder)
+{
+ struct drm_device *dev = encoder->dev;
+
+ drm_encoder_cleanup(encoder);
+ devm_kfree(dev->dev, encoder);
+}
+
+static const struct drm_encoder_funcs drm_simple_encoder_funcs_destroy = {
+ .destroy = drm_encoder_destroy,
+};
+
+/**
+ * drm_simple_encoder_create - Allocate and initialize an encoder
+ * @dev: drm device
+ * @encoder_type: user visible type of the encoder
+ * @name: printf style format string for the encoder name, or NULL for
+ * default name
+ *
+ * Allocates and initialises an encoder that has no further functionality. The
+ * encoder will be released automatically.
+ *
+ * Returns:
+ * The encoder on success, a pointer-encoder error code on failure.
+ */
+struct drm_encoder *drm_simple_encoder_create(struct drm_device *dev,
+ int encoder_type,
+ const char *name, ...)
+{
+ char *namestr = NULL;
+ struct drm_encoder *encoder;
+ int ret;
+
+ encoder = devm_kzalloc(dev->dev, sizeof(*encoder), GFP_KERNEL);
+ if (!encoder)
+ return ERR_PTR(-ENOMEM);
+
+ if (name) {
+ va_list ap;
+
+ va_start(ap, name);
+ namestr = kvasprintf(GFP_KERNEL, name, ap);
+ va_end(ap);
+ if (!namestr) {
+ ret = -ENOMEM;
+ goto err_devm_kfree;
+ }
+ }
+
+ ret = __drm_encoder_init(dev, encoder,
+ &drm_simple_encoder_funcs_destroy,
+ encoder_type, namestr);
+ if (ret)
+ goto err_kfree;
+
+ return encoder;
+
+err_kfree:
+ if (name)
+ kfree(namestr);
+err_devm_kfree:
+ devm_kfree(dev->dev, encoder);
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL(drm_simple_encoder_create);
+
/**
* drm_encoder_cleanup - cleans up an initialised encoder
* @encoder: encoder to cleanup
diff --git a/include/drm/drm_encoder.h b/include/drm/drm_encoder.h
index 5623994b6e9e..0214f6cf9de6 100644
--- a/include/drm/drm_encoder.h
+++ b/include/drm/drm_encoder.h
@@ -190,6 +190,16 @@ int drm_encoder_init(struct drm_device *dev,
const struct drm_encoder_funcs *funcs,
int encoder_type, const char *name, ...);
+__printf(4, 5)
+int drm_simple_encoder_init(struct drm_device *dev,
+ struct drm_encoder *encoder,
+ int encoder_type, const char *name, ...);
+
+__printf(3, 4)
+struct drm_encoder *drm_simple_encoder_create(struct drm_device *dev,
+ int encoder_type,
+ const char *name, ...);
+
/**
* drm_encoder_index - find the index of a registered encoder
* @encoder: encoder to find index for
--
2.25.0
_______________________________________________
Spice-devel mailing list
Spice-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/spice-devel
