1/*
  2 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
  3 * Authors:
  4 *	Inki Dae <inki.dae@samsung.com>
  5 *	Joonyoung Shim <jy0922.shim@samsung.com>
  6 *	Seung-Woo Kim <sw0312.kim@samsung.com>
  7 *
  8 * Permission is hereby granted, free of charge, to any person obtaining a
  9 * copy of this software and associated documentation files (the "Software"),
 10 * to deal in the Software without restriction, including without limitation
 11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 12 * and/or sell copies of the Software, and to permit persons to whom the
 13 * Software is furnished to do so, subject to the following conditions:
 14 *
 15 * The above copyright notice and this permission notice (including the next
 16 * paragraph) shall be included in all copies or substantial portions of the
 17 * Software.
 18 *
 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 22 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 25 * OTHER DEALINGS IN THE SOFTWARE.
 26 */
 27
 28#include "drmP.h"
 29#include "drm_crtc_helper.h"
 30
 31#include <drm/exynos_drm.h>
 32#include "exynos_drm_drv.h"
 33#include "exynos_drm_encoder.h"
 34
 35#define MAX_EDID 256
 36#define to_exynos_connector(x)	container_of(x, struct exynos_drm_connector,\
 37				drm_connector)
 38
 39struct exynos_drm_connector {
 40	struct drm_connector	drm_connector;
 41	uint32_t		encoder_id;
 42	struct exynos_drm_manager *manager;
 43};
 44
 45/* convert exynos_video_timings to drm_display_mode */
 46static inline void
 47convert_to_display_mode(struct drm_display_mode *mode,
 48			struct exynos_drm_panel_info *panel)
 49{
 50	struct fb_videomode *timing = &panel->timing;
 51	DRM_DEBUG_KMS("%s\n", __FILE__);
 52
 53	mode->clock = timing->pixclock / 1000;
 54	mode->vrefresh = timing->refresh;
 55
 56	mode->hdisplay = timing->xres;
 57	mode->hsync_start = mode->hdisplay + timing->right_margin;
 58	mode->hsync_end = mode->hsync_start + timing->hsync_len;
 59	mode->htotal = mode->hsync_end + timing->left_margin;
 60
 61	mode->vdisplay = timing->yres;
 62	mode->vsync_start = mode->vdisplay + timing->lower_margin;
 63	mode->vsync_end = mode->vsync_start + timing->vsync_len;
 64	mode->vtotal = mode->vsync_end + timing->upper_margin;
 65	mode->width_mm = panel->width_mm;
 66	mode->height_mm = panel->height_mm;
 67
 68	if (timing->vmode & FB_VMODE_INTERLACED)
 69		mode->flags |= DRM_MODE_FLAG_INTERLACE;
 70
 71	if (timing->vmode & FB_VMODE_DOUBLE)
 72		mode->flags |= DRM_MODE_FLAG_DBLSCAN;
 73}
 74
 75/* convert drm_display_mode to exynos_video_timings */
 76static inline void
 77convert_to_video_timing(struct fb_videomode *timing,
 78			struct drm_display_mode *mode)
 79{
 80	DRM_DEBUG_KMS("%s\n", __FILE__);
 81
 82	memset(timing, 0, sizeof(*timing));
 83
 84	timing->pixclock = mode->clock * 1000;
 85	timing->refresh = drm_mode_vrefresh(mode);
 86
 87	timing->xres = mode->hdisplay;
 88	timing->right_margin = mode->hsync_start - mode->hdisplay;
 89	timing->hsync_len = mode->hsync_end - mode->hsync_start;
 90	timing->left_margin = mode->htotal - mode->hsync_end;
 91
 92	timing->yres = mode->vdisplay;
 93	timing->lower_margin = mode->vsync_start - mode->vdisplay;
 94	timing->vsync_len = mode->vsync_end - mode->vsync_start;
 95	timing->upper_margin = mode->vtotal - mode->vsync_end;
 96
 97	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 98		timing->vmode = FB_VMODE_INTERLACED;
 99	else
100		timing->vmode = FB_VMODE_NONINTERLACED;
101
102	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
103		timing->vmode |= FB_VMODE_DOUBLE;
104}
105
106static int exynos_drm_connector_get_modes(struct drm_connector *connector)
107{
108	struct exynos_drm_connector *exynos_connector =
109					to_exynos_connector(connector);
110	struct exynos_drm_manager *manager = exynos_connector->manager;
111	struct exynos_drm_display_ops *display_ops = manager->display_ops;
112	unsigned int count;
113
114	DRM_DEBUG_KMS("%s\n", __FILE__);
115
116	if (!display_ops) {
117		DRM_DEBUG_KMS("display_ops is null.\n");
118		return 0;
119	}
120
121	/*
122	 * if get_edid() exists then get_edid() callback of hdmi side
123	 * is called to get edid data through i2c interface else
124	 * get timing from the FIMD driver(display controller).
125	 *
126	 * P.S. in case of lcd panel, count is always 1 if success
127	 * because lcd panel has only one mode.
128	 */
129	if (display_ops->get_edid) {
130		int ret;
131		void *edid;
132
133		edid = kzalloc(MAX_EDID, GFP_KERNEL);
134		if (!edid) {
135			DRM_ERROR("failed to allocate edid\n");
136			return 0;
137		}
138
139		ret = display_ops->get_edid(manager->dev, connector,
140						edid, MAX_EDID);
141		if (ret < 0) {
142			DRM_ERROR("failed to get edid data.\n");
143			kfree(edid);
144			edid = NULL;
145			return 0;
146		}
147
148		drm_mode_connector_update_edid_property(connector, edid);
149		count = drm_add_edid_modes(connector, edid);
150
151		kfree(connector->display_info.raw_edid);
152		connector->display_info.raw_edid = edid;
153	} else {
154		struct drm_display_mode *mode = drm_mode_create(connector->dev);
155		struct exynos_drm_panel_info *panel;
156
157		if (display_ops->get_panel)
158			panel = display_ops->get_panel(manager->dev);
159		else {
160			drm_mode_destroy(connector->dev, mode);
161			return 0;
162		}
163
164		convert_to_display_mode(mode, panel);
165		connector->display_info.width_mm = mode->width_mm;
166		connector->display_info.height_mm = mode->height_mm;
167
168		mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
169		drm_mode_set_name(mode);
170		drm_mode_probed_add(connector, mode);
171
172		count = 1;
173	}
174
175	return count;
176}
177
178static int exynos_drm_connector_mode_valid(struct drm_connector *connector,
179					    struct drm_display_mode *mode)
180{
181	struct exynos_drm_connector *exynos_connector =
182					to_exynos_connector(connector);
183	struct exynos_drm_manager *manager = exynos_connector->manager;
184	struct exynos_drm_display_ops *display_ops = manager->display_ops;
185	struct fb_videomode timing;
186	int ret = MODE_BAD;
187
188	DRM_DEBUG_KMS("%s\n", __FILE__);
189
190	convert_to_video_timing(&timing, mode);
191
192	if (display_ops && display_ops->check_timing)
193		if (!display_ops->check_timing(manager->dev, (void *)&timing))
194			ret = MODE_OK;
195
196	return ret;
197}
198
199struct drm_encoder *exynos_drm_best_encoder(struct drm_connector *connector)
200{
201	struct drm_device *dev = connector->dev;
202	struct exynos_drm_connector *exynos_connector =
203					to_exynos_connector(connector);
204	struct drm_mode_object *obj;
205	struct drm_encoder *encoder;
206
207	DRM_DEBUG_KMS("%s\n", __FILE__);
208
209	obj = drm_mode_object_find(dev, exynos_connector->encoder_id,
210				   DRM_MODE_OBJECT_ENCODER);
211	if (!obj) {
212		DRM_DEBUG_KMS("Unknown ENCODER ID %d\n",
213				exynos_connector->encoder_id);
214		return NULL;
215	}
216
217	encoder = obj_to_encoder(obj);
218
219	return encoder;
220}
221
222static struct drm_connector_helper_funcs exynos_connector_helper_funcs = {
223	.get_modes	= exynos_drm_connector_get_modes,
224	.mode_valid	= exynos_drm_connector_mode_valid,
225	.best_encoder	= exynos_drm_best_encoder,
226};
227
228static int exynos_drm_connector_fill_modes(struct drm_connector *connector,
229				unsigned int max_width, unsigned int max_height)
230{
231	struct exynos_drm_connector *exynos_connector =
232					to_exynos_connector(connector);
233	struct exynos_drm_manager *manager = exynos_connector->manager;
234	struct exynos_drm_manager_ops *ops = manager->ops;
235	unsigned int width, height;
236
237	width = max_width;
238	height = max_height;
239
240	/*
241	 * if specific driver want to find desired_mode using maxmum
242	 * resolution then get max width and height from that driver.
243	 */
244	if (ops && ops->get_max_resol)
245		ops->get_max_resol(manager->dev, &width, &height);
246
247	return drm_helper_probe_single_connector_modes(connector, width,
248							height);
249}
250
251/* get detection status of display device. */
252static enum drm_connector_status
253exynos_drm_connector_detect(struct drm_connector *connector, bool force)
254{
255	struct exynos_drm_connector *exynos_connector =
256					to_exynos_connector(connector);
257	struct exynos_drm_manager *manager = exynos_connector->manager;
258	struct exynos_drm_display_ops *display_ops =
259					manager->display_ops;
260	enum drm_connector_status status = connector_status_disconnected;
261
262	DRM_DEBUG_KMS("%s\n", __FILE__);
263
264	if (display_ops && display_ops->is_connected) {
265		if (display_ops->is_connected(manager->dev))
266			status = connector_status_connected;
267		else
268			status = connector_status_disconnected;
269	}
270
271	return status;
272}
273
274static void exynos_drm_connector_destroy(struct drm_connector *connector)
275{
276	struct exynos_drm_connector *exynos_connector =
277		to_exynos_connector(connector);
278
279	DRM_DEBUG_KMS("%s\n", __FILE__);
280
281	drm_sysfs_connector_remove(connector);
282	drm_connector_cleanup(connector);
283	kfree(exynos_connector);
284}
285
286static struct drm_connector_funcs exynos_connector_funcs = {
287	.dpms		= drm_helper_connector_dpms,
288	.fill_modes	= exynos_drm_connector_fill_modes,
289	.detect		= exynos_drm_connector_detect,
290	.destroy	= exynos_drm_connector_destroy,
291};
292
293struct drm_connector *exynos_drm_connector_create(struct drm_device *dev,
294						   struct drm_encoder *encoder)
295{
296	struct exynos_drm_connector *exynos_connector;
297	struct exynos_drm_manager *manager = exynos_drm_get_manager(encoder);
298	struct drm_connector *connector;
299	int type;
300	int err;
301
302	DRM_DEBUG_KMS("%s\n", __FILE__);
303
304	exynos_connector = kzalloc(sizeof(*exynos_connector), GFP_KERNEL);
305	if (!exynos_connector) {
306		DRM_ERROR("failed to allocate connector\n");
307		return NULL;
308	}
309
310	connector = &exynos_connector->drm_connector;
311
312	switch (manager->display_ops->type) {
313	case EXYNOS_DISPLAY_TYPE_HDMI:
314		type = DRM_MODE_CONNECTOR_HDMIA;
315		connector->interlace_allowed = true;
316		connector->polled = DRM_CONNECTOR_POLL_HPD;
317		break;
318	case EXYNOS_DISPLAY_TYPE_VIDI:
319		type = DRM_MODE_CONNECTOR_VIRTUAL;
320		connector->polled = DRM_CONNECTOR_POLL_HPD;
321		break;
322	default:
323		type = DRM_MODE_CONNECTOR_Unknown;
324		break;
325	}
326
327	drm_connector_init(dev, connector, &exynos_connector_funcs, type);
328	drm_connector_helper_add(connector, &exynos_connector_helper_funcs);
329
330	err = drm_sysfs_connector_add(connector);
331	if (err)
332		goto err_connector;
333
334	exynos_connector->encoder_id = encoder->base.id;
335	exynos_connector->manager = manager;
336	connector->encoder = encoder;
337
338	err = drm_mode_connector_attach_encoder(connector, encoder);
339	if (err) {
340		DRM_ERROR("failed to attach a connector to a encoder\n");
341		goto err_sysfs;
342	}
343
344	DRM_DEBUG_KMS("connector has been created\n");
345
346	return connector;
347
348err_sysfs:
349	drm_sysfs_connector_remove(connector);
350err_connector:
351	drm_connector_cleanup(connector);
352	kfree(exynos_connector);
353	return NULL;
354}