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0d4bbaf9 RC |
1 | /* |
2 | * Copyright (C) 2012 Texas Instruments | |
3 | * Author: Rob Clark <robdclark@gmail.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published by | |
7 | * the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #include <linux/pinctrl/pinmux.h> | |
19 | #include <linux/pinctrl/consumer.h> | |
20 | #include <linux/backlight.h> | |
21 | #include <video/display_timing.h> | |
22 | #include <video/of_display_timing.h> | |
23 | #include <video/videomode.h> | |
24 | ||
25 | #include "tilcdc_drv.h" | |
26 | ||
27 | struct panel_module { | |
28 | struct tilcdc_module base; | |
29 | struct tilcdc_panel_info *info; | |
30 | struct display_timings *timings; | |
31 | struct backlight_device *backlight; | |
32 | }; | |
33 | #define to_panel_module(x) container_of(x, struct panel_module, base) | |
34 | ||
35 | ||
36 | /* | |
37 | * Encoder: | |
38 | */ | |
39 | ||
40 | struct panel_encoder { | |
41 | struct drm_encoder base; | |
42 | struct panel_module *mod; | |
43 | }; | |
44 | #define to_panel_encoder(x) container_of(x, struct panel_encoder, base) | |
45 | ||
46 | ||
47 | static void panel_encoder_destroy(struct drm_encoder *encoder) | |
48 | { | |
49 | struct panel_encoder *panel_encoder = to_panel_encoder(encoder); | |
50 | drm_encoder_cleanup(encoder); | |
51 | kfree(panel_encoder); | |
52 | } | |
53 | ||
54 | static void panel_encoder_dpms(struct drm_encoder *encoder, int mode) | |
55 | { | |
56 | struct panel_encoder *panel_encoder = to_panel_encoder(encoder); | |
57 | struct backlight_device *backlight = panel_encoder->mod->backlight; | |
58 | ||
59 | if (!backlight) | |
60 | return; | |
61 | ||
62 | backlight->props.power = mode == DRM_MODE_DPMS_ON | |
63 | ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; | |
64 | backlight_update_status(backlight); | |
65 | } | |
66 | ||
67 | static bool panel_encoder_mode_fixup(struct drm_encoder *encoder, | |
68 | const struct drm_display_mode *mode, | |
69 | struct drm_display_mode *adjusted_mode) | |
70 | { | |
71 | /* nothing needed */ | |
72 | return true; | |
73 | } | |
74 | ||
75 | static void panel_encoder_prepare(struct drm_encoder *encoder) | |
76 | { | |
77 | struct panel_encoder *panel_encoder = to_panel_encoder(encoder); | |
78 | panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF); | |
79 | tilcdc_crtc_set_panel_info(encoder->crtc, panel_encoder->mod->info); | |
80 | } | |
81 | ||
82 | static void panel_encoder_commit(struct drm_encoder *encoder) | |
83 | { | |
84 | panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON); | |
85 | } | |
86 | ||
87 | static void panel_encoder_mode_set(struct drm_encoder *encoder, | |
88 | struct drm_display_mode *mode, | |
89 | struct drm_display_mode *adjusted_mode) | |
90 | { | |
91 | /* nothing needed */ | |
92 | } | |
93 | ||
94 | static const struct drm_encoder_funcs panel_encoder_funcs = { | |
95 | .destroy = panel_encoder_destroy, | |
96 | }; | |
97 | ||
98 | static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = { | |
99 | .dpms = panel_encoder_dpms, | |
100 | .mode_fixup = panel_encoder_mode_fixup, | |
101 | .prepare = panel_encoder_prepare, | |
102 | .commit = panel_encoder_commit, | |
103 | .mode_set = panel_encoder_mode_set, | |
104 | }; | |
105 | ||
106 | static struct drm_encoder *panel_encoder_create(struct drm_device *dev, | |
107 | struct panel_module *mod) | |
108 | { | |
109 | struct panel_encoder *panel_encoder; | |
110 | struct drm_encoder *encoder; | |
111 | int ret; | |
112 | ||
113 | panel_encoder = kzalloc(sizeof(*panel_encoder), GFP_KERNEL); | |
114 | if (!panel_encoder) { | |
115 | dev_err(dev->dev, "allocation failed\n"); | |
116 | return NULL; | |
117 | } | |
118 | ||
119 | panel_encoder->mod = mod; | |
120 | ||
121 | encoder = &panel_encoder->base; | |
122 | encoder->possible_crtcs = 1; | |
123 | ||
124 | ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs, | |
125 | DRM_MODE_ENCODER_LVDS); | |
126 | if (ret < 0) | |
127 | goto fail; | |
128 | ||
129 | drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs); | |
130 | ||
131 | return encoder; | |
132 | ||
133 | fail: | |
134 | panel_encoder_destroy(encoder); | |
135 | return NULL; | |
136 | } | |
137 | ||
138 | /* | |
139 | * Connector: | |
140 | */ | |
141 | ||
142 | struct panel_connector { | |
143 | struct drm_connector base; | |
144 | ||
145 | struct drm_encoder *encoder; /* our connected encoder */ | |
146 | struct panel_module *mod; | |
147 | }; | |
148 | #define to_panel_connector(x) container_of(x, struct panel_connector, base) | |
149 | ||
150 | ||
151 | static void panel_connector_destroy(struct drm_connector *connector) | |
152 | { | |
153 | struct panel_connector *panel_connector = to_panel_connector(connector); | |
e396900e | 154 | drm_sysfs_connector_remove(connector); |
0d4bbaf9 RC |
155 | drm_connector_cleanup(connector); |
156 | kfree(panel_connector); | |
157 | } | |
158 | ||
159 | static enum drm_connector_status panel_connector_detect( | |
160 | struct drm_connector *connector, | |
161 | bool force) | |
162 | { | |
163 | return connector_status_connected; | |
164 | } | |
165 | ||
166 | static int panel_connector_get_modes(struct drm_connector *connector) | |
167 | { | |
168 | struct drm_device *dev = connector->dev; | |
169 | struct panel_connector *panel_connector = to_panel_connector(connector); | |
170 | struct display_timings *timings = panel_connector->mod->timings; | |
171 | int i; | |
172 | ||
173 | for (i = 0; i < timings->num_timings; i++) { | |
174 | struct drm_display_mode *mode = drm_mode_create(dev); | |
175 | struct videomode vm; | |
176 | ||
6cd2c7db | 177 | if (videomode_from_timings(timings, &vm, i)) |
0d4bbaf9 RC |
178 | break; |
179 | ||
180 | drm_display_mode_from_videomode(&vm, mode); | |
181 | ||
182 | mode->type = DRM_MODE_TYPE_DRIVER; | |
183 | ||
184 | if (timings->native_mode == i) | |
185 | mode->type |= DRM_MODE_TYPE_PREFERRED; | |
186 | ||
187 | drm_mode_set_name(mode); | |
188 | drm_mode_probed_add(connector, mode); | |
189 | } | |
190 | ||
191 | return i; | |
192 | } | |
193 | ||
194 | static int panel_connector_mode_valid(struct drm_connector *connector, | |
195 | struct drm_display_mode *mode) | |
196 | { | |
197 | struct tilcdc_drm_private *priv = connector->dev->dev_private; | |
198 | /* our only constraints are what the crtc can generate: */ | |
199 | return tilcdc_crtc_mode_valid(priv->crtc, mode); | |
200 | } | |
201 | ||
202 | static struct drm_encoder *panel_connector_best_encoder( | |
203 | struct drm_connector *connector) | |
204 | { | |
205 | struct panel_connector *panel_connector = to_panel_connector(connector); | |
206 | return panel_connector->encoder; | |
207 | } | |
208 | ||
209 | static const struct drm_connector_funcs panel_connector_funcs = { | |
210 | .destroy = panel_connector_destroy, | |
211 | .dpms = drm_helper_connector_dpms, | |
212 | .detect = panel_connector_detect, | |
213 | .fill_modes = drm_helper_probe_single_connector_modes, | |
214 | }; | |
215 | ||
216 | static const struct drm_connector_helper_funcs panel_connector_helper_funcs = { | |
217 | .get_modes = panel_connector_get_modes, | |
218 | .mode_valid = panel_connector_mode_valid, | |
219 | .best_encoder = panel_connector_best_encoder, | |
220 | }; | |
221 | ||
222 | static struct drm_connector *panel_connector_create(struct drm_device *dev, | |
223 | struct panel_module *mod, struct drm_encoder *encoder) | |
224 | { | |
225 | struct panel_connector *panel_connector; | |
226 | struct drm_connector *connector; | |
227 | int ret; | |
228 | ||
229 | panel_connector = kzalloc(sizeof(*panel_connector), GFP_KERNEL); | |
230 | if (!panel_connector) { | |
231 | dev_err(dev->dev, "allocation failed\n"); | |
232 | return NULL; | |
233 | } | |
234 | ||
235 | panel_connector->encoder = encoder; | |
236 | panel_connector->mod = mod; | |
237 | ||
238 | connector = &panel_connector->base; | |
239 | ||
240 | drm_connector_init(dev, connector, &panel_connector_funcs, | |
241 | DRM_MODE_CONNECTOR_LVDS); | |
242 | drm_connector_helper_add(connector, &panel_connector_helper_funcs); | |
243 | ||
244 | connector->interlace_allowed = 0; | |
245 | connector->doublescan_allowed = 0; | |
246 | ||
247 | ret = drm_mode_connector_attach_encoder(connector, encoder); | |
248 | if (ret) | |
249 | goto fail; | |
250 | ||
34ea3d38 | 251 | drm_connector_register(connector); |
0d4bbaf9 RC |
252 | |
253 | return connector; | |
254 | ||
255 | fail: | |
256 | panel_connector_destroy(connector); | |
257 | return NULL; | |
258 | } | |
259 | ||
260 | /* | |
261 | * Module: | |
262 | */ | |
263 | ||
264 | static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev) | |
265 | { | |
266 | struct panel_module *panel_mod = to_panel_module(mod); | |
267 | struct tilcdc_drm_private *priv = dev->dev_private; | |
268 | struct drm_encoder *encoder; | |
269 | struct drm_connector *connector; | |
270 | ||
271 | encoder = panel_encoder_create(dev, panel_mod); | |
272 | if (!encoder) | |
273 | return -ENOMEM; | |
274 | ||
275 | connector = panel_connector_create(dev, panel_mod, encoder); | |
276 | if (!connector) | |
277 | return -ENOMEM; | |
278 | ||
279 | priv->encoders[priv->num_encoders++] = encoder; | |
280 | priv->connectors[priv->num_connectors++] = connector; | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | static void panel_destroy(struct tilcdc_module *mod) | |
286 | { | |
287 | struct panel_module *panel_mod = to_panel_module(mod); | |
288 | ||
c9a3ad25 | 289 | if (panel_mod->timings) |
0d4bbaf9 | 290 | display_timings_release(panel_mod->timings); |
0d4bbaf9 RC |
291 | |
292 | tilcdc_module_cleanup(mod); | |
293 | kfree(panel_mod->info); | |
294 | kfree(panel_mod); | |
295 | } | |
296 | ||
297 | static const struct tilcdc_module_ops panel_module_ops = { | |
298 | .modeset_init = panel_modeset_init, | |
299 | .destroy = panel_destroy, | |
300 | }; | |
301 | ||
302 | /* | |
303 | * Device: | |
304 | */ | |
305 | ||
306 | /* maybe move this somewhere common if it is needed by other outputs? */ | |
1733d010 | 307 | static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np) |
0d4bbaf9 RC |
308 | { |
309 | struct device_node *info_np; | |
310 | struct tilcdc_panel_info *info; | |
311 | int ret = 0; | |
312 | ||
313 | if (!np) { | |
314 | pr_err("%s: no devicenode given\n", __func__); | |
315 | return NULL; | |
316 | } | |
317 | ||
318 | info_np = of_get_child_by_name(np, "panel-info"); | |
319 | if (!info_np) { | |
320 | pr_err("%s: could not find panel-info node\n", __func__); | |
321 | return NULL; | |
322 | } | |
323 | ||
324 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
325 | if (!info) { | |
326 | pr_err("%s: allocation failed\n", __func__); | |
327 | return NULL; | |
328 | } | |
329 | ||
330 | ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias); | |
331 | ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt); | |
332 | ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz); | |
333 | ret |= of_property_read_u32(info_np, "bpp", &info->bpp); | |
334 | ret |= of_property_read_u32(info_np, "fdd", &info->fdd); | |
335 | ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge); | |
336 | ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl); | |
337 | ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order); | |
338 | ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th); | |
339 | ||
340 | /* optional: */ | |
341 | info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode"); | |
342 | info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk"); | |
343 | ||
344 | if (ret) { | |
345 | pr_err("%s: error reading panel-info properties\n", __func__); | |
346 | kfree(info); | |
347 | return NULL; | |
348 | } | |
349 | ||
350 | return info; | |
351 | } | |
352 | ||
353 | static struct of_device_id panel_of_match[]; | |
354 | ||
355 | static int panel_probe(struct platform_device *pdev) | |
356 | { | |
357 | struct device_node *node = pdev->dev.of_node; | |
358 | struct panel_module *panel_mod; | |
359 | struct tilcdc_module *mod; | |
360 | struct pinctrl *pinctrl; | |
361 | int ret = -EINVAL; | |
362 | ||
363 | ||
364 | /* bail out early if no DT data: */ | |
365 | if (!node) { | |
366 | dev_err(&pdev->dev, "device-tree data is missing\n"); | |
367 | return -ENXIO; | |
368 | } | |
369 | ||
370 | panel_mod = kzalloc(sizeof(*panel_mod), GFP_KERNEL); | |
371 | if (!panel_mod) | |
372 | return -ENOMEM; | |
373 | ||
374 | mod = &panel_mod->base; | |
375 | ||
376 | tilcdc_module_init(mod, "panel", &panel_module_ops); | |
377 | ||
378 | pinctrl = devm_pinctrl_get_select_default(&pdev->dev); | |
379 | if (IS_ERR(pinctrl)) | |
380 | dev_warn(&pdev->dev, "pins are not configured\n"); | |
381 | ||
382 | ||
383 | panel_mod->timings = of_get_display_timings(node); | |
384 | if (!panel_mod->timings) { | |
385 | dev_err(&pdev->dev, "could not get panel timings\n"); | |
386 | goto fail; | |
387 | } | |
388 | ||
389 | panel_mod->info = of_get_panel_info(node); | |
390 | if (!panel_mod->info) { | |
391 | dev_err(&pdev->dev, "could not get panel info\n"); | |
392 | goto fail; | |
393 | } | |
394 | ||
dc28aa07 BP |
395 | mod->preferred_bpp = panel_mod->info->bpp; |
396 | ||
0d4bbaf9 RC |
397 | panel_mod->backlight = of_find_backlight_by_node(node); |
398 | if (panel_mod->backlight) | |
399 | dev_info(&pdev->dev, "found backlight\n"); | |
400 | ||
401 | return 0; | |
402 | ||
403 | fail: | |
404 | panel_destroy(mod); | |
405 | return ret; | |
406 | } | |
407 | ||
408 | static int panel_remove(struct platform_device *pdev) | |
409 | { | |
410 | return 0; | |
411 | } | |
412 | ||
413 | static struct of_device_id panel_of_match[] = { | |
414 | { .compatible = "ti,tilcdc,panel", }, | |
415 | { }, | |
416 | }; | |
0d4bbaf9 RC |
417 | |
418 | struct platform_driver panel_driver = { | |
419 | .probe = panel_probe, | |
420 | .remove = panel_remove, | |
421 | .driver = { | |
422 | .owner = THIS_MODULE, | |
423 | .name = "panel", | |
424 | .of_match_table = panel_of_match, | |
425 | }, | |
426 | }; | |
427 | ||
428 | int __init tilcdc_panel_init(void) | |
429 | { | |
430 | return platform_driver_register(&panel_driver); | |
431 | } | |
432 | ||
433 | void __exit tilcdc_panel_fini(void) | |
434 | { | |
435 | platform_driver_unregister(&panel_driver); | |
436 | } |