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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
27struct 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
40struct 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
47static 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
54static 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
67static 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
75static 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
82static void panel_encoder_commit(struct drm_encoder *encoder)
83{
84 panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
85}
86
87static 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
94static const struct drm_encoder_funcs panel_encoder_funcs = {
95 .destroy = panel_encoder_destroy,
96};
97
98static 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
106static 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
133fail:
134 panel_encoder_destroy(encoder);
135 return NULL;
136}
137
138/*
139 * Connector:
140 */
141
142struct 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
151static void panel_connector_destroy(struct drm_connector *connector)
152{
153 struct panel_connector *panel_connector = to_panel_connector(connector);
154 drm_connector_cleanup(connector);
155 kfree(panel_connector);
156}
157
158static enum drm_connector_status panel_connector_detect(
159 struct drm_connector *connector,
160 bool force)
161{
162 return connector_status_connected;
163}
164
165static int panel_connector_get_modes(struct drm_connector *connector)
166{
167 struct drm_device *dev = connector->dev;
168 struct panel_connector *panel_connector = to_panel_connector(connector);
169 struct display_timings *timings = panel_connector->mod->timings;
170 int i;
171
172 for (i = 0; i < timings->num_timings; i++) {
173 struct drm_display_mode *mode = drm_mode_create(dev);
174 struct videomode vm;
175
176 if (videomode_from_timings(timings, &vm, i))
177 break;
178
179 drm_display_mode_from_videomode(&vm, mode);
180
181 mode->type = DRM_MODE_TYPE_DRIVER;
182
183 if (timings->native_mode == i)
184 mode->type |= DRM_MODE_TYPE_PREFERRED;
185
186 drm_mode_set_name(mode);
187 drm_mode_probed_add(connector, mode);
188 }
189
190 return i;
191}
192
193static int panel_connector_mode_valid(struct drm_connector *connector,
194 struct drm_display_mode *mode)
195{
196 struct tilcdc_drm_private *priv = connector->dev->dev_private;
197 /* our only constraints are what the crtc can generate: */
198 return tilcdc_crtc_mode_valid(priv->crtc, mode);
199}
200
201static struct drm_encoder *panel_connector_best_encoder(
202 struct drm_connector *connector)
203{
204 struct panel_connector *panel_connector = to_panel_connector(connector);
205 return panel_connector->encoder;
206}
207
208static const struct drm_connector_funcs panel_connector_funcs = {
209 .destroy = panel_connector_destroy,
210 .dpms = drm_helper_connector_dpms,
211 .detect = panel_connector_detect,
212 .fill_modes = drm_helper_probe_single_connector_modes,
213};
214
215static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
216 .get_modes = panel_connector_get_modes,
217 .mode_valid = panel_connector_mode_valid,
218 .best_encoder = panel_connector_best_encoder,
219};
220
221static struct drm_connector *panel_connector_create(struct drm_device *dev,
222 struct panel_module *mod, struct drm_encoder *encoder)
223{
224 struct panel_connector *panel_connector;
225 struct drm_connector *connector;
226 int ret;
227
228 panel_connector = kzalloc(sizeof(*panel_connector), GFP_KERNEL);
229 if (!panel_connector) {
230 dev_err(dev->dev, "allocation failed\n");
231 return NULL;
232 }
233
234 panel_connector->encoder = encoder;
235 panel_connector->mod = mod;
236
237 connector = &panel_connector->base;
238
239 drm_connector_init(dev, connector, &panel_connector_funcs,
240 DRM_MODE_CONNECTOR_LVDS);
241 drm_connector_helper_add(connector, &panel_connector_helper_funcs);
242
243 connector->interlace_allowed = 0;
244 connector->doublescan_allowed = 0;
245
246 ret = drm_mode_connector_attach_encoder(connector, encoder);
247 if (ret)
248 goto fail;
249
250 drm_sysfs_connector_add(connector);
251
252 return connector;
253
254fail:
255 panel_connector_destroy(connector);
256 return NULL;
257}
258
259/*
260 * Module:
261 */
262
263static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
264{
265 struct panel_module *panel_mod = to_panel_module(mod);
266 struct tilcdc_drm_private *priv = dev->dev_private;
267 struct drm_encoder *encoder;
268 struct drm_connector *connector;
269
270 encoder = panel_encoder_create(dev, panel_mod);
271 if (!encoder)
272 return -ENOMEM;
273
274 connector = panel_connector_create(dev, panel_mod, encoder);
275 if (!connector)
276 return -ENOMEM;
277
278 priv->encoders[priv->num_encoders++] = encoder;
279 priv->connectors[priv->num_connectors++] = connector;
280
281 return 0;
282}
283
284static void panel_destroy(struct tilcdc_module *mod)
285{
286 struct panel_module *panel_mod = to_panel_module(mod);
287
288 if (panel_mod->timings) {
289 display_timings_release(panel_mod->timings);
290 kfree(panel_mod->timings);
291 }
292
293 tilcdc_module_cleanup(mod);
294 kfree(panel_mod->info);
295 kfree(panel_mod);
296}
297
298static const struct tilcdc_module_ops panel_module_ops = {
299 .modeset_init = panel_modeset_init,
300 .destroy = panel_destroy,
301};
302
303/*
304 * Device:
305 */
306
307/* maybe move this somewhere common if it is needed by other outputs? */
308static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
309{
310 struct device_node *info_np;
311 struct tilcdc_panel_info *info;
312 int ret = 0;
313
314 if (!np) {
315 pr_err("%s: no devicenode given\n", __func__);
316 return NULL;
317 }
318
319 info_np = of_get_child_by_name(np, "panel-info");
320 if (!info_np) {
321 pr_err("%s: could not find panel-info node\n", __func__);
322 return NULL;
323 }
324
325 info = kzalloc(sizeof(*info), GFP_KERNEL);
326 if (!info) {
327 pr_err("%s: allocation failed\n", __func__);
328 return NULL;
329 }
330
331 ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
332 ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
333 ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
334 ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
335 ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
336 ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
337 ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
338 ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
339 ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
340
341 /* optional: */
342 info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode");
343 info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk");
344
345 if (ret) {
346 pr_err("%s: error reading panel-info properties\n", __func__);
347 kfree(info);
348 return NULL;
349 }
350
351 return info;
352}
353
354static struct of_device_id panel_of_match[];
355
356static int panel_probe(struct platform_device *pdev)
357{
358 struct device_node *node = pdev->dev.of_node;
359 struct panel_module *panel_mod;
360 struct tilcdc_module *mod;
361 struct pinctrl *pinctrl;
362 int ret = -EINVAL;
363
364
365 /* bail out early if no DT data: */
366 if (!node) {
367 dev_err(&pdev->dev, "device-tree data is missing\n");
368 return -ENXIO;
369 }
370
371 panel_mod = kzalloc(sizeof(*panel_mod), GFP_KERNEL);
372 if (!panel_mod)
373 return -ENOMEM;
374
375 mod = &panel_mod->base;
376
377 tilcdc_module_init(mod, "panel", &panel_module_ops);
378
379 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
380 if (IS_ERR(pinctrl))
381 dev_warn(&pdev->dev, "pins are not configured\n");
382
383
384 panel_mod->timings = of_get_display_timings(node);
385 if (!panel_mod->timings) {
386 dev_err(&pdev->dev, "could not get panel timings\n");
387 goto fail;
388 }
389
390 panel_mod->info = of_get_panel_info(node);
391 if (!panel_mod->info) {
392 dev_err(&pdev->dev, "could not get panel info\n");
393 goto fail;
394 }
395
396 mod->preferred_bpp = panel_mod->info->bpp;
397
398 panel_mod->backlight = of_find_backlight_by_node(node);
399 if (panel_mod->backlight)
400 dev_info(&pdev->dev, "found backlight\n");
401
402 return 0;
403
404fail:
405 panel_destroy(mod);
406 return ret;
407}
408
409static int panel_remove(struct platform_device *pdev)
410{
411 return 0;
412}
413
414static struct of_device_id panel_of_match[] = {
415 { .compatible = "ti,tilcdc,panel", },
416 { },
417};
418
419struct platform_driver panel_driver = {
420 .probe = panel_probe,
421 .remove = panel_remove,
422 .driver = {
423 .owner = THIS_MODULE,
424 .name = "panel",
425 .of_match_table = panel_of_match,
426 },
427};
428
429int __init tilcdc_panel_init(void)
430{
431 return platform_driver_register(&panel_driver);
432}
433
434void __exit tilcdc_panel_fini(void)
435{
436 platform_driver_unregister(&panel_driver);
437}