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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 | * @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; | |
e03e6de0 DV |
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 | */ | |
321a95ae DV |
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 | ||
e03e6de0 DV |
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 | */ | |
321a95ae | 150 | uint32_t possible_crtcs; |
e03e6de0 DV |
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 | */ | |
321a95ae DV |
167 | uint32_t possible_clones; |
168 | ||
2e2b96ef DV |
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 | */ | |
321a95ae DV |
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 | */ | |
6f3be036 | 195 | static inline unsigned int drm_encoder_index(const struct drm_encoder *encoder) |
321a95ae DV |
196 | { |
197 | return encoder->index; | |
198 | } | |
199 | ||
6f3be036 VS |
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 | ||
321a95ae DV |
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 | * | |
e03e6de0 | 217 | * Returns false if @encoder can't be driven by @crtc, true otherwise. |
321a95ae DV |
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 | ||
e03e6de0 DV |
225 | /** |
226 | * drm_encoder_find - find a &drm_encoder | |
227 | * @dev: DRM device | |
e7e62c7e | 228 | * @file_priv: drm file to check for lease against. |
e03e6de0 DV |
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 | */ | |
321a95ae | 234 | static inline struct drm_encoder *drm_encoder_find(struct drm_device *dev, |
418da172 | 235 | struct drm_file *file_priv, |
e03e6de0 | 236 | uint32_t id) |
321a95ae DV |
237 | { |
238 | struct drm_mode_object *mo; | |
e03e6de0 | 239 | |
418da172 | 240 | mo = drm_mode_object_find(dev, file_priv, id, DRM_MODE_OBJECT_ENCODER); |
e03e6de0 | 241 | |
321a95ae DV |
242 | return mo ? obj_to_encoder(mo) : NULL; |
243 | } | |
244 | ||
245 | void drm_encoder_cleanup(struct drm_encoder *encoder); | |
246 | ||
afb21ea6 DV |
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) \ | |
6f3be036 | 257 | for_each_if ((encoder_mask) & drm_encoder_mask(encoder)) |
afb21ea6 DV |
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 | ||
321a95ae | 269 | #endif |