1 | /* |
2 | * Copyright (c) 2016 Intel Corporation |
3 | * |
4 | * Permission to use, copy, modify, distribute, and sell this software and its |
5 | * documentation for any purpose is hereby granted without fee, provided that |
6 | * the above copyright notice appear in all copies and that both that copyright |
7 | * notice and this permission notice appear in supporting documentation, and |
8 | * that the name of the copyright holders not be used in advertising or |
9 | * publicity pertaining to distribution of the software without specific, |
10 | * written prior permission. The copyright holders make no representations |
11 | * about the suitability of this software for any purpose. It is provided "as |
12 | * is" without express or implied warranty. |
13 | * |
14 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
15 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
16 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
17 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
18 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
19 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
20 | * OF THIS SOFTWARE. |
21 | */ |
22 | |
23 | #ifndef __DRM_ENCODER_H__ |
24 | #define __DRM_ENCODER_H__ |
25 | |
26 | #include <linux/list.h> |
27 | #include <linux/ctype.h> |
28 | #include <drm/drm_crtc.h> |
29 | #include <drm/drm_mode.h> |
30 | #include <drm/drm_mode_object.h> |
31 | #include <drm/drm_util.h> |
32 | |
33 | struct drm_encoder; |
34 | |
35 | /** |
36 | * struct drm_encoder_funcs - encoder controls |
37 | * |
38 | * Encoders sit between CRTCs and connectors. |
39 | */ |
40 | struct drm_encoder_funcs { |
41 | /** |
42 | * @reset: |
43 | * |
44 | * Reset encoder hardware and software state to off. This function isn't |
45 | * called by the core directly, only through drm_mode_config_reset(). |
46 | * It's not a helper hook only for historical reasons. |
47 | */ |
48 | void (*reset)(struct drm_encoder *encoder); |
49 | |
50 | /** |
51 | * @destroy: |
52 | * |
53 | * Clean up encoder resources. This is only called at driver unload time |
54 | * through drm_mode_config_cleanup() since an encoder cannot be |
55 | * hotplugged in DRM. |
56 | */ |
57 | void (*destroy)(struct drm_encoder *encoder); |
58 | |
59 | /** |
60 | * @late_register: |
61 | * |
62 | * This optional hook can be used to register additional userspace |
63 | * interfaces attached to the encoder like debugfs interfaces. |
64 | * It is called late in the driver load sequence from drm_dev_register(). |
65 | * Everything added from this callback should be unregistered in |
66 | * the early_unregister callback. |
67 | * |
68 | * Returns: |
69 | * |
70 | * 0 on success, or a negative error code on failure. |
71 | */ |
72 | int (*late_register)(struct drm_encoder *encoder); |
73 | |
74 | /** |
75 | * @early_unregister: |
76 | * |
77 | * This optional hook should be used to unregister the additional |
78 | * userspace interfaces attached to the encoder from |
79 | * @late_register. It is called from drm_dev_unregister(), |
80 | * early in the driver unload sequence to disable userspace access |
81 | * before data structures are torndown. |
82 | */ |
83 | void (*early_unregister)(struct drm_encoder *encoder); |
84 | }; |
85 | |
86 | /** |
87 | * struct drm_encoder - central DRM encoder structure |
88 | * @dev: parent DRM device |
89 | * @head: list management |
90 | * @base: base KMS object |
91 | * @name: human readable name, can be overwritten by the driver |
92 | * @bridge: bridge associated to the encoder |
93 | * @funcs: control functions |
94 | * @helper_private: mid-layer private data |
95 | * |
96 | * CRTCs drive pixels to encoders, which convert them into signals |
97 | * appropriate for a given connector or set of connectors. |
98 | */ |
99 | struct drm_encoder { |
100 | struct drm_device *dev; |
101 | struct list_head head; |
102 | |
103 | struct drm_mode_object base; |
104 | char *name; |
105 | /** |
106 | * @encoder_type: |
107 | * |
108 | * One of the DRM_MODE_ENCODER_<foo> types in drm_mode.h. The following |
109 | * encoder types are defined thus far: |
110 | * |
111 | * - DRM_MODE_ENCODER_DAC for VGA and analog on DVI-I/DVI-A. |
112 | * |
113 | * - DRM_MODE_ENCODER_TMDS for DVI, HDMI and (embedded) DisplayPort. |
114 | * |
115 | * - DRM_MODE_ENCODER_LVDS for display panels, or in general any panel |
116 | * with a proprietary parallel connector. |
117 | * |
118 | * - DRM_MODE_ENCODER_TVDAC for TV output (Composite, S-Video, |
119 | * Component, SCART). |
120 | * |
121 | * - DRM_MODE_ENCODER_VIRTUAL for virtual machine displays |
122 | * |
123 | * - DRM_MODE_ENCODER_DSI for panels connected using the DSI serial bus. |
124 | * |
125 | * - DRM_MODE_ENCODER_DPI for panels connected using the DPI parallel |
126 | * bus. |
127 | * |
128 | * - DRM_MODE_ENCODER_DPMST for special fake encoders used to allow |
129 | * mutliple DP MST streams to share one physical encoder. |
130 | */ |
131 | int encoder_type; |
132 | |
133 | /** |
134 | * @index: Position inside the mode_config.list, can be used as an array |
135 | * index. It is invariant over the lifetime of the encoder. |
136 | */ |
137 | unsigned index; |
138 | |
139 | /** |
140 | * @possible_crtcs: Bitmask of potential CRTC bindings, using |
141 | * drm_crtc_index() as the index into the bitfield. The driver must set |
142 | * the bits for all &drm_crtc objects this encoder can be connected to |
143 | * before calling drm_encoder_init(). |
144 | * |
145 | * In reality almost every driver gets this wrong. |
146 | * |
147 | * Note that since CRTC objects can't be hotplugged the assigned indices |
148 | * are stable and hence known before registering all objects. |
149 | */ |
150 | uint32_t possible_crtcs; |
151 | |
152 | /** |
153 | * @possible_clones: Bitmask of potential sibling encoders for cloning, |
154 | * using drm_encoder_index() as the index into the bitfield. The driver |
155 | * must set the bits for all &drm_encoder objects which can clone a |
156 | * &drm_crtc together with this encoder before calling |
157 | * drm_encoder_init(). Drivers should set the bit representing the |
158 | * encoder itself, too. Cloning bits should be set such that when two |
159 | * encoders can be used in a cloned configuration, they both should have |
160 | * each another bits set. |
161 | * |
162 | * In reality almost every driver gets this wrong. |
163 | * |
164 | * Note that since encoder objects can't be hotplugged the assigned indices |
165 | * are stable and hence known before registering all objects. |
166 | */ |
167 | uint32_t possible_clones; |
168 | |
169 | /** |
170 | * @crtc: Currently bound CRTC, only really meaningful for non-atomic |
171 | * drivers. Atomic drivers should instead check |
172 | * &drm_connector_state.crtc. |
173 | */ |
174 | struct drm_crtc *crtc; |
175 | struct drm_bridge *bridge; |
176 | const struct drm_encoder_funcs *funcs; |
177 | const struct drm_encoder_helper_funcs *helper_private; |
178 | }; |
179 | |
180 | #define obj_to_encoder(x) container_of(x, struct drm_encoder, base) |
181 | |
182 | __printf(5, 6) |
183 | int drm_encoder_init(struct drm_device *dev, |
184 | struct drm_encoder *encoder, |
185 | const struct drm_encoder_funcs *funcs, |
186 | int encoder_type, const char *name, ...); |
187 | |
188 | /** |
189 | * drm_encoder_index - find the index of a registered encoder |
190 | * @encoder: encoder to find index for |
191 | * |
192 | * Given a registered encoder, return the index of that encoder within a DRM |
193 | * device's list of encoders. |
194 | */ |
195 | static inline unsigned int drm_encoder_index(const struct drm_encoder *encoder) |
196 | { |
197 | return encoder->index; |
198 | } |
199 | |
200 | /** |
201 | * drm_encoder_mask - find the mask of a registered ENCODER |
202 | * @encoder: encoder to find mask for |
203 | * |
204 | * Given a registered encoder, return the mask bit of that encoder for an |
205 | * encoder's possible_clones field. |
206 | */ |
207 | static inline u32 drm_encoder_mask(const struct drm_encoder *encoder) |
208 | { |
209 | return 1 << drm_encoder_index(encoder); |
210 | } |
211 | |
212 | /** |
213 | * drm_encoder_crtc_ok - can a given crtc drive a given encoder? |
214 | * @encoder: encoder to test |
215 | * @crtc: crtc to test |
216 | * |
217 | * Returns false if @encoder can't be driven by @crtc, true otherwise. |
218 | */ |
219 | static inline bool drm_encoder_crtc_ok(struct drm_encoder *encoder, |
220 | struct drm_crtc *crtc) |
221 | { |
222 | return !!(encoder->possible_crtcs & drm_crtc_mask(crtc)); |
223 | } |
224 | |
225 | /** |
226 | * drm_encoder_find - find a &drm_encoder |
227 | * @dev: DRM device |
228 | * @file_priv: drm file to check for lease against. |
229 | * @id: encoder id |
230 | * |
231 | * Returns the encoder with @id, NULL if it doesn't exist. Simple wrapper around |
232 | * drm_mode_object_find(). |
233 | */ |
234 | static inline struct drm_encoder *drm_encoder_find(struct drm_device *dev, |
235 | struct drm_file *file_priv, |
236 | uint32_t id) |
237 | { |
238 | struct drm_mode_object *mo; |
239 | |
240 | mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_ENCODER); |
241 | |
242 | return mo ? obj_to_encoder(mo) : NULL; |
243 | } |
244 | |
245 | void drm_encoder_cleanup(struct drm_encoder *encoder); |
246 | |
247 | /** |
248 | * drm_for_each_encoder_mask - iterate over encoders specified by bitmask |
249 | * @encoder: the loop cursor |
250 | * @dev: the DRM device |
251 | * @encoder_mask: bitmask of encoder indices |
252 | * |
253 | * Iterate over all encoders specified by bitmask. |
254 | */ |
255 | #define drm_for_each_encoder_mask(encoder, dev, encoder_mask) \ |
256 | list_for_each_entry((encoder), &(dev)->mode_config.encoder_list, head) \ |
257 | for_each_if ((encoder_mask) & drm_encoder_mask(encoder)) |
258 | |
259 | /** |
260 | * drm_for_each_encoder - iterate over all encoders |
261 | * @encoder: the loop cursor |
262 | * @dev: the DRM device |
263 | * |
264 | * Iterate over all encoders of @dev. |
265 | */ |
266 | #define drm_for_each_encoder(encoder, dev) \ |
267 | list_for_each_entry(encoder, &(dev)->mode_config.encoder_list, head) |
268 | |
269 | #endif |
270 | |