--- /dev/null
+/*
+ * Copyright (C) 2009 Francisco Jerez.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial
+ * portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include <linux/module.h>
+
+#include <drm/drm_encoder_slave.h>
+
+/**
+ * drm_i2c_encoder_init - Initialize an I2C slave encoder
+ * @dev: DRM device.
+ * @encoder: Encoder to be attached to the I2C device. You aren't
+ * required to have called drm_encoder_init() before.
+ * @adap: I2C adapter that will be used to communicate with
+ * the device.
+ * @info: Information that will be used to create the I2C device.
+ * Required fields are @addr and @type.
+ *
+ * Create an I2C device on the specified bus (the module containing its
+ * driver is transparently loaded) and attach it to the specified
+ * &drm_encoder_slave. The @slave_funcs field will be initialized with
+ * the hooks provided by the slave driver.
+ *
+ * If @info->platform_data is non-NULL it will be used as the initial
+ * slave config.
+ *
+ * Returns 0 on success or a negative errno on failure, in particular,
+ * -ENODEV is returned when no matching driver is found.
+ */
+int drm_i2c_encoder_init(struct drm_device *dev,
+ struct drm_encoder_slave *encoder,
+ struct i2c_adapter *adap,
+ const struct i2c_board_info *info)
+{
+ struct module *module = NULL;
+ struct i2c_client *client;
+ struct drm_i2c_encoder_driver *encoder_drv;
+ int err = 0;
+
+ request_module("%s%s", I2C_MODULE_PREFIX, info->type);
+
+ client = i2c_new_device(adap, info);
+ if (!client) {
+ err = -ENOMEM;
+ goto fail;
+ }
+
+ if (!client->dev.driver) {
+ err = -ENODEV;
+ goto fail_unregister;
+ }
+
+ module = client->dev.driver->owner;
+ if (!try_module_get(module)) {
+ err = -ENODEV;
+ goto fail_unregister;
+ }
+
+ encoder->bus_priv = client;
+
+ encoder_drv = to_drm_i2c_encoder_driver(to_i2c_driver(client->dev.driver));
+
+ err = encoder_drv->encoder_init(client, dev, encoder);
+ if (err)
+ goto fail_unregister;
+
+ if (info->platform_data)
+ encoder->slave_funcs->set_config(&encoder->base,
+ info->platform_data);
+
+ return 0;
+
+fail_unregister:
+ i2c_unregister_device(client);
+ module_put(module);
+fail:
+ return err;
+}
+EXPORT_SYMBOL(drm_i2c_encoder_init);
+
+/**
+ * drm_i2c_encoder_destroy - Unregister the I2C device backing an encoder
+ * @drm_encoder: Encoder to be unregistered.
+ *
+ * This should be called from the @destroy method of an I2C slave
+ * encoder driver once I2C access is no longer needed.
+ */
+void drm_i2c_encoder_destroy(struct drm_encoder *drm_encoder)
+{
+ struct drm_encoder_slave *encoder = to_encoder_slave(drm_encoder);
+ struct i2c_client *client = drm_i2c_encoder_get_client(drm_encoder);
+ struct module *module = client->dev.driver->owner;
+
+ i2c_unregister_device(client);
+ encoder->bus_priv = NULL;
+
+ module_put(module);
+}
+EXPORT_SYMBOL(drm_i2c_encoder_destroy);
+
+/*
+ * Wrapper fxns which can be plugged in to drm_encoder_helper_funcs:
+ */
+
+static inline struct drm_encoder_slave_funcs *
+get_slave_funcs(struct drm_encoder *enc)
+{
+ return to_encoder_slave(enc)->slave_funcs;
+}
+
+void drm_i2c_encoder_dpms(struct drm_encoder *encoder, int mode)
+{
+ get_slave_funcs(encoder)->dpms(encoder, mode);
+}
+EXPORT_SYMBOL(drm_i2c_encoder_dpms);
+
+bool drm_i2c_encoder_mode_fixup(struct drm_encoder *encoder,
+ const struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ return get_slave_funcs(encoder)->mode_fixup(encoder, mode, adjusted_mode);
+}
+EXPORT_SYMBOL(drm_i2c_encoder_mode_fixup);
+
+void drm_i2c_encoder_prepare(struct drm_encoder *encoder)
+{
+ drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
+}
+EXPORT_SYMBOL(drm_i2c_encoder_prepare);
+
+void drm_i2c_encoder_commit(struct drm_encoder *encoder)
+{
+ drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
+}
+EXPORT_SYMBOL(drm_i2c_encoder_commit);
+
+void drm_i2c_encoder_mode_set(struct drm_encoder *encoder,
+ struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ get_slave_funcs(encoder)->mode_set(encoder, mode, adjusted_mode);
+}
+EXPORT_SYMBOL(drm_i2c_encoder_mode_set);
+
+enum drm_connector_status drm_i2c_encoder_detect(struct drm_encoder *encoder,
+ struct drm_connector *connector)
+{
+ return get_slave_funcs(encoder)->detect(encoder, connector);
+}
+EXPORT_SYMBOL(drm_i2c_encoder_detect);
+
+void drm_i2c_encoder_save(struct drm_encoder *encoder)
+{
+ get_slave_funcs(encoder)->save(encoder);
+}
+EXPORT_SYMBOL(drm_i2c_encoder_save);
+
+void drm_i2c_encoder_restore(struct drm_encoder *encoder)
+{
+ get_slave_funcs(encoder)->restore(encoder);
+}
+EXPORT_SYMBOL(drm_i2c_encoder_restore);
Code Review / kvmfornfv.git / blobdiff