diff options
| -rw-r--r-- | drivers/gpu/drm/Makefile | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/drm_encoder_slave.c | 116 | ||||
| -rw-r--r-- | include/drm/drm_encoder_slave.h | 162 |
3 files changed, 279 insertions, 1 deletions
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index fe23f29f7cba..5f0aec4f082a 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -11,7 +11,7 @@ drm-y := drm_auth.o drm_bufs.o drm_cache.o \ drm_agpsupport.o drm_scatter.o ati_pcigart.o drm_pci.o \ drm_sysfs.o drm_hashtab.o drm_sman.o drm_mm.o \ drm_crtc.o drm_crtc_helper.o drm_modes.o drm_edid.o \ - drm_info.o drm_debugfs.o + drm_info.o drm_debugfs.o drm_encoder_slave.o drm-$(CONFIG_COMPAT) += drm_ioc32.o diff --git a/drivers/gpu/drm/drm_encoder_slave.c b/drivers/gpu/drm/drm_encoder_slave.c new file mode 100644 index 000000000000..6ffd600ccfae --- /dev/null +++ b/drivers/gpu/drm/drm_encoder_slave.c @@ -0,0 +1,116 @@ +/* + * 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 <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. + * + * 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) +{ + char modalias[sizeof(I2C_MODULE_PREFIX) + + I2C_NAME_SIZE]; + struct module *module = NULL; + struct i2c_client *client; + struct drm_i2c_encoder_driver *encoder_drv; + int err = 0; + + snprintf(modalias, sizeof(modalias), + "%s%s", I2C_MODULE_PREFIX, info->type); + request_module(modalias); + + client = i2c_new_device(adap, info); + if (!client) { + err = -ENOMEM; + goto fail; + } + + if (!client->driver) { + err = -ENODEV; + goto fail_unregister; + } + + module = client->driver->driver.owner; + if (!try_module_get(module)) { + err = -ENODEV; + goto fail_unregister; + } + + encoder->bus_priv = client; + + encoder_drv = to_drm_i2c_encoder_driver(client->driver); + + err = encoder_drv->encoder_init(client, dev, encoder); + if (err) + goto fail_unregister; + + 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->driver->driver.owner; + + i2c_unregister_device(client); + encoder->bus_priv = NULL; + + module_put(module); +} +EXPORT_SYMBOL(drm_i2c_encoder_destroy); diff --git a/include/drm/drm_encoder_slave.h b/include/drm/drm_encoder_slave.h new file mode 100644 index 000000000000..821ec40c17d8 --- /dev/null +++ b/include/drm/drm_encoder_slave.h @@ -0,0 +1,162 @@ +/* + * 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. + * + */ + +#ifndef __DRM_ENCODER_SLAVE_H__ +#define __DRM_ENCODER_SLAVE_H__ + +#include <drm/drmP.h> +#include <drm/drm_crtc.h> + +/** + * struct drm_encoder_slave_funcs - Entry points exposed by a slave encoder driver + * @set_config: Initialize any encoder-specific modesetting parameters. + * The meaning of the @params parameter is implementation + * dependent. It will usually be a structure with DVO port + * data format settings or timings. It's not required for + * the new parameters to take effect until the next mode + * is set. + * + * Most of its members are analogous to the function pointers in + * &drm_encoder_helper_funcs and they can optionally be used to + * initialize the latter. Connector-like methods (e.g. @get_modes and + * @set_property) will typically be wrapped around and only be called + * if the encoder is the currently selected one for the connector. + */ +struct drm_encoder_slave_funcs { + void (*set_config)(struct drm_encoder *encoder, + void *params); + + void (*destroy)(struct drm_encoder *encoder); + void (*dpms)(struct drm_encoder *encoder, int mode); + void (*save)(struct drm_encoder *encoder); + void (*restore)(struct drm_encoder *encoder); + bool (*mode_fixup)(struct drm_encoder *encoder, + struct drm_display_mode *mode, + struct drm_display_mode *adjusted_mode); + int (*mode_valid)(struct drm_encoder *encoder, + struct drm_display_mode *mode); + void (*mode_set)(struct drm_encoder *encoder, + struct drm_display_mode *mode, + struct drm_display_mode *adjusted_mode); + + enum drm_connector_status (*detect)(struct drm_encoder *encoder, + struct drm_connector *connector); + int (*get_modes)(struct drm_encoder *encoder, + struct drm_connector *connector); + int (*create_resources)(struct drm_encoder *encoder, + struct drm_connector *connector); + int (*set_property)(struct drm_encoder *encoder, + struct drm_connector *connector, + struct drm_property *property, + uint64_t val); + +}; + +/** + * struct drm_encoder_slave - Slave encoder struct + * @base: DRM encoder object. + * @slave_funcs: Slave encoder callbacks. + * @slave_priv: Slave encoder private data. + * @bus_priv: Bus specific data. + * + * A &drm_encoder_slave has two sets of callbacks, @slave_funcs and the + * ones in @base. The former are never actually called by the common + * CRTC code, it's just a convenience for splitting the encoder + * functions in an upper, GPU-specific layer and a (hopefully) + * GPU-agnostic lower layer: It's the GPU driver responsibility to + * call the slave methods when appropriate. + * + * drm_i2c_encoder_init() provides a way to get an implementation of + * this. + */ +struct drm_encoder_slave { + struct drm_encoder base; + + struct drm_encoder_slave_funcs *slave_funcs; + void *slave_priv; + void *bus_priv; +}; +#define to_encoder_slave(x) container_of((x), struct drm_encoder_slave, base) + +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 drm_i2c_encoder_driver + * + * Describes a device driver for an encoder connected to the GPU + * through an I2C bus. In addition to the entry points in @i2c_driver + * an @encoder_init function should be provided. It will be called to + * give the driver an opportunity to allocate any per-encoder data + * structures and to initialize the @slave_funcs and (optionally) + * @slave_priv members of @encoder. + */ +struct drm_i2c_encoder_driver { + struct i2c_driver i2c_driver; + + int (*encoder_init)(struct i2c_client *client, + struct drm_device *dev, + struct drm_encoder_slave *encoder); + +}; +#define to_drm_i2c_encoder_driver(x) container_of((x), \ + struct drm_i2c_encoder_driver, \ + i2c_driver) + +/** + * drm_i2c_encoder_get_client - Get the I2C client corresponding to an encoder + */ +static inline struct i2c_client *drm_i2c_encoder_get_client(struct drm_encoder *encoder) +{ + return (struct i2c_client *)to_encoder_slave(encoder)->bus_priv; +} + +/** + * drm_i2c_encoder_register - Register an I2C encoder driver + * @owner: Module containing the driver. + * @driver: Driver to be registered. + */ +static inline int drm_i2c_encoder_register(struct module *owner, + struct drm_i2c_encoder_driver *driver) +{ + return i2c_register_driver(owner, &driver->i2c_driver); +} + +/** + * drm_i2c_encoder_unregister - Unregister an I2C encoder driver + * @driver: Driver to be unregistered. + */ +static inline void drm_i2c_encoder_unregister(struct drm_i2c_encoder_driver *driver) +{ + return i2c_del_driver(&driver->i2c_driver); +} + +void drm_i2c_encoder_destroy(struct drm_encoder *encoder); + +#endif |