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321a95ae DV |
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> | |
2407d1dc | 28 | #include <drm/drm_crtc.h> |
9338203c | 29 | #include <drm/drm_mode.h> |
949619f3 | 30 | #include <drm/drm_mode_object.h> |
d78aa650 | 31 | #include <drm/drm_util.h> |
321a95ae | 32 | |
9338203c LP |
33 | struct drm_encoder; |
34 | ||
321a95ae DV |
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 | |
559bdaf7 | 79 | * @late_register. It is called from drm_dev_unregister(), |
321a95ae DV |
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 | |
321a95ae DV |
92 | * @funcs: control functions |
93 | * @helper_private: mid-layer private data | |
94 | * | |
95 | * CRTCs drive pixels to encoders, which convert them into signals | |
96 | * appropriate for a given connector or set of connectors. | |
97 | */ | |
98 | struct drm_encoder { | |
99 | struct drm_device *dev; | |
100 | struct list_head head; | |
101 | ||
102 | struct drm_mode_object base; | |
103 | char *name; | |
e03e6de0 DV |
104 | /** |
105 | * @encoder_type: | |
106 | * | |
107 | * One of the DRM_MODE_ENCODER_<foo> types in drm_mode.h. The following | |
108 | * encoder types are defined thus far: | |
109 | * | |
110 | * - DRM_MODE_ENCODER_DAC for VGA and analog on DVI-I/DVI-A. | |
111 | * | |
112 | * - DRM_MODE_ENCODER_TMDS for DVI, HDMI and (embedded) DisplayPort. | |
113 | * | |
114 | * - DRM_MODE_ENCODER_LVDS for display panels, or in general any panel | |
115 | * with a proprietary parallel connector. | |
116 | * | |
117 | * - DRM_MODE_ENCODER_TVDAC for TV output (Composite, S-Video, | |
118 | * Component, SCART). | |
119 | * | |
120 | * - DRM_MODE_ENCODER_VIRTUAL for virtual machine displays | |
121 | * | |
122 | * - DRM_MODE_ENCODER_DSI for panels connected using the DSI serial bus. | |
123 | * | |
124 | * - DRM_MODE_ENCODER_DPI for panels connected using the DPI parallel | |
125 | * bus. | |
126 | * | |
127 | * - DRM_MODE_ENCODER_DPMST for special fake encoders used to allow | |
128 | * mutliple DP MST streams to share one physical encoder. | |
129 | */ | |
321a95ae DV |
130 | int encoder_type; |
131 | ||
132 | /** | |
133 | * @index: Position inside the mode_config.list, can be used as an array | |
134 | * index. It is invariant over the lifetime of the encoder. | |
135 | */ | |
136 | unsigned index; | |
137 | ||
e03e6de0 DV |
138 | /** |
139 | * @possible_crtcs: Bitmask of potential CRTC bindings, using | |
140 | * drm_crtc_index() as the index into the bitfield. The driver must set | |
141 | * the bits for all &drm_crtc objects this encoder can be connected to | |
c873724d | 142 | * before calling drm_dev_register(). |
e03e6de0 | 143 | * |
0df10823 | 144 | * You will get a WARN if you get this wrong in the driver. |
e03e6de0 DV |
145 | * |
146 | * Note that since CRTC objects can't be hotplugged the assigned indices | |
147 | * are stable and hence known before registering all objects. | |
148 | */ | |
321a95ae | 149 | uint32_t possible_crtcs; |
e03e6de0 DV |
150 | |
151 | /** | |
152 | * @possible_clones: Bitmask of potential sibling encoders for cloning, | |
153 | * using drm_encoder_index() as the index into the bitfield. The driver | |
154 | * must set the bits for all &drm_encoder objects which can clone a | |
155 | * &drm_crtc together with this encoder before calling | |
8c8ae2fe | 156 | * drm_dev_register(). Drivers should set the bit representing the |
e03e6de0 DV |
157 | * encoder itself, too. Cloning bits should be set such that when two |
158 | * encoders can be used in a cloned configuration, they both should have | |
159 | * each another bits set. | |
160 | * | |
71427795 VS |
161 | * As an exception to the above rule if the driver doesn't implement |
162 | * any cloning it can leave @possible_clones set to 0. The core will | |
163 | * automagically fix this up by setting the bit for the encoder itself. | |
e03e6de0 | 164 | * |
74d2aacb VS |
165 | * You will get a WARN if you get this wrong in the driver. |
166 | * | |
e03e6de0 DV |
167 | * Note that since encoder objects can't be hotplugged the assigned indices |
168 | * are stable and hence known before registering all objects. | |
169 | */ | |
321a95ae DV |
170 | uint32_t possible_clones; |
171 | ||
2e2b96ef DV |
172 | /** |
173 | * @crtc: Currently bound CRTC, only really meaningful for non-atomic | |
174 | * drivers. Atomic drivers should instead check | |
175 | * &drm_connector_state.crtc. | |
176 | */ | |
321a95ae | 177 | struct drm_crtc *crtc; |
05193dc3 BB |
178 | |
179 | /** | |
be39f3db LP |
180 | * @bridge_chain: Bridges attached to this encoder. Drivers shall not |
181 | * access this field directly. | |
05193dc3 BB |
182 | */ |
183 | struct list_head bridge_chain; | |
184 | ||
321a95ae DV |
185 | const struct drm_encoder_funcs *funcs; |
186 | const struct drm_encoder_helper_funcs *helper_private; | |
187 | }; | |
188 | ||
189 | #define obj_to_encoder(x) container_of(x, struct drm_encoder, base) | |
190 | ||
191 | __printf(5, 6) | |
192 | int drm_encoder_init(struct drm_device *dev, | |
193 | struct drm_encoder *encoder, | |
194 | const struct drm_encoder_funcs *funcs, | |
195 | int encoder_type, const char *name, ...); | |
196 | ||
197 | /** | |
198 | * drm_encoder_index - find the index of a registered encoder | |
199 | * @encoder: encoder to find index for | |
200 | * | |
201 | * Given a registered encoder, return the index of that encoder within a DRM | |
202 | * device's list of encoders. | |
203 | */ | |
6f3be036 | 204 | static inline unsigned int drm_encoder_index(const struct drm_encoder *encoder) |
321a95ae DV |
205 | { |
206 | return encoder->index; | |
207 | } | |
208 | ||
6f3be036 | 209 | /** |
a859f127 | 210 | * drm_encoder_mask - find the mask of a registered encoder |
6f3be036 VS |
211 | * @encoder: encoder to find mask for |
212 | * | |
213 | * Given a registered encoder, return the mask bit of that encoder for an | |
214 | * encoder's possible_clones field. | |
215 | */ | |
216 | static inline u32 drm_encoder_mask(const struct drm_encoder *encoder) | |
217 | { | |
218 | return 1 << drm_encoder_index(encoder); | |
219 | } | |
220 | ||
321a95ae DV |
221 | /** |
222 | * drm_encoder_crtc_ok - can a given crtc drive a given encoder? | |
223 | * @encoder: encoder to test | |
224 | * @crtc: crtc to test | |
225 | * | |
e03e6de0 | 226 | * Returns false if @encoder can't be driven by @crtc, true otherwise. |
321a95ae DV |
227 | */ |
228 | static inline bool drm_encoder_crtc_ok(struct drm_encoder *encoder, | |
229 | struct drm_crtc *crtc) | |
230 | { | |
231 | return !!(encoder->possible_crtcs & drm_crtc_mask(crtc)); | |
232 | } | |
233 | ||
e03e6de0 DV |
234 | /** |
235 | * drm_encoder_find - find a &drm_encoder | |
236 | * @dev: DRM device | |
e7e62c7e | 237 | * @file_priv: drm file to check for lease against. |
e03e6de0 DV |
238 | * @id: encoder id |
239 | * | |
240 | * Returns the encoder with @id, NULL if it doesn't exist. Simple wrapper around | |
241 | * drm_mode_object_find(). | |
242 | */ | |
321a95ae | 243 | static inline struct drm_encoder *drm_encoder_find(struct drm_device *dev, |
418da172 | 244 | struct drm_file *file_priv, |
e03e6de0 | 245 | uint32_t id) |
321a95ae DV |
246 | { |
247 | struct drm_mode_object *mo; | |
e03e6de0 | 248 | |
418da172 | 249 | mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_ENCODER); |
e03e6de0 | 250 | |
321a95ae DV |
251 | return mo ? obj_to_encoder(mo) : NULL; |
252 | } | |
253 | ||
254 | void drm_encoder_cleanup(struct drm_encoder *encoder); | |
255 | ||
afb21ea6 DV |
256 | /** |
257 | * drm_for_each_encoder_mask - iterate over encoders specified by bitmask | |
258 | * @encoder: the loop cursor | |
259 | * @dev: the DRM device | |
260 | * @encoder_mask: bitmask of encoder indices | |
261 | * | |
262 | * Iterate over all encoders specified by bitmask. | |
263 | */ | |
264 | #define drm_for_each_encoder_mask(encoder, dev, encoder_mask) \ | |
265 | list_for_each_entry((encoder), &(dev)->mode_config.encoder_list, head) \ | |
6f3be036 | 266 | for_each_if ((encoder_mask) & drm_encoder_mask(encoder)) |
afb21ea6 DV |
267 | |
268 | /** | |
269 | * drm_for_each_encoder - iterate over all encoders | |
270 | * @encoder: the loop cursor | |
271 | * @dev: the DRM device | |
272 | * | |
273 | * Iterate over all encoders of @dev. | |
274 | */ | |
275 | #define drm_for_each_encoder(encoder, dev) \ | |
276 | list_for_each_entry(encoder, &(dev)->mode_config.encoder_list, head) | |
277 | ||
321a95ae | 278 | #endif |