1/*
2 * i.MX drm driver - parallel display implementation
3 *
4 * Copyright (C) 2012 Sascha Hauer, Pengutronix
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 */
15
16#include <linux/component.h>
17#include <linux/module.h>
18#include <drm/drmP.h>
19#include <drm/drm_fb_helper.h>
20#include <drm/drm_crtc_helper.h>
21#include <drm/drm_panel.h>
22#include <linux/videodev2.h>
23#include <video/of_display_timing.h>
24#include <linux/of_graph.h>
25
26#include "imx-drm.h"
27
28#define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)
29#define enc_to_imxpd(x) container_of(x, struct imx_parallel_display, encoder)
30
31struct imx_parallel_display {
32	struct drm_connector connector;
33	struct drm_encoder encoder;
34	struct device *dev;
35	void *edid;
36	int edid_len;
37	u32 bus_format;
38	int mode_valid;
39	struct drm_display_mode mode;
40	struct drm_panel *panel;
41};
42
43static enum drm_connector_status imx_pd_connector_detect(
44		struct drm_connector *connector, bool force)
45{
46	return connector_status_connected;
47}
48
49static int imx_pd_connector_get_modes(struct drm_connector *connector)
50{
51	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
52	struct device_node *np = imxpd->dev->of_node;
53	int num_modes = 0;
54
55	if (imxpd->panel && imxpd->panel->funcs &&
56	    imxpd->panel->funcs->get_modes) {
57		struct drm_display_info *di = &connector->display_info;
58
59		num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
60		if (!imxpd->bus_format && di->num_bus_formats)
61			imxpd->bus_format = di->bus_formats[0];
62		if (num_modes > 0)
63			return num_modes;
64	}
65
66	if (imxpd->edid) {
67		drm_mode_connector_update_edid_property(connector, imxpd->edid);
68		num_modes = drm_add_edid_modes(connector, imxpd->edid);
69	}
70
71	if (imxpd->mode_valid) {
72		struct drm_display_mode *mode = drm_mode_create(connector->dev);
73
74		if (!mode)
75			return -EINVAL;
76		drm_mode_copy(mode, &imxpd->mode);
77		mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
78		drm_mode_probed_add(connector, mode);
79		num_modes++;
80	}
81
82	if (np) {
83		struct drm_display_mode *mode = drm_mode_create(connector->dev);
84
85		if (!mode)
86			return -EINVAL;
87		of_get_drm_display_mode(np, &imxpd->mode, OF_USE_NATIVE_MODE);
88		drm_mode_copy(mode, &imxpd->mode);
89		mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
90		drm_mode_probed_add(connector, mode);
91		num_modes++;
92	}
93
94	return num_modes;
95}
96
97static struct drm_encoder *imx_pd_connector_best_encoder(
98		struct drm_connector *connector)
99{
100	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
101
102	return &imxpd->encoder;
103}
104
105static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
106{
107	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
108
109	if (mode != DRM_MODE_DPMS_ON)
110		drm_panel_disable(imxpd->panel);
111	else
112		drm_panel_enable(imxpd->panel);
113}
114
115static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
116			   const struct drm_display_mode *mode,
117			   struct drm_display_mode *adjusted_mode)
118{
119	return true;
120}
121
122static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
123{
124	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
125
126	imx_drm_set_bus_format(encoder, imxpd->bus_format);
127}
128
129static void imx_pd_encoder_commit(struct drm_encoder *encoder)
130{
131	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
132
133	drm_panel_prepare(imxpd->panel);
134	drm_panel_enable(imxpd->panel);
135}
136
137static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
138			 struct drm_display_mode *orig_mode,
139			 struct drm_display_mode *mode)
140{
141}
142
143static void imx_pd_encoder_disable(struct drm_encoder *encoder)
144{
145	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
146
147	drm_panel_disable(imxpd->panel);
148	drm_panel_unprepare(imxpd->panel);
149}
150
151static struct drm_connector_funcs imx_pd_connector_funcs = {
152	.dpms = drm_helper_connector_dpms,
153	.fill_modes = drm_helper_probe_single_connector_modes,
154	.detect = imx_pd_connector_detect,
155	.destroy = imx_drm_connector_destroy,
156};
157
158static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
159	.get_modes = imx_pd_connector_get_modes,
160	.best_encoder = imx_pd_connector_best_encoder,
161};
162
163static struct drm_encoder_funcs imx_pd_encoder_funcs = {
164	.destroy = imx_drm_encoder_destroy,
165};
166
167static struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
168	.dpms = imx_pd_encoder_dpms,
169	.mode_fixup = imx_pd_encoder_mode_fixup,
170	.prepare = imx_pd_encoder_prepare,
171	.commit = imx_pd_encoder_commit,
172	.mode_set = imx_pd_encoder_mode_set,
173	.disable = imx_pd_encoder_disable,
174};
175
176static int imx_pd_register(struct drm_device *drm,
177	struct imx_parallel_display *imxpd)
178{
179	int ret;
180
181	ret = imx_drm_encoder_parse_of(drm, &imxpd->encoder,
182				       imxpd->dev->of_node);
183	if (ret)
184		return ret;
185
186	/* set the connector's dpms to OFF so that
187	 * drm_helper_connector_dpms() won't return
188	 * immediately since the current state is ON
189	 * at this point.
190	 */
191	imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
192
193	drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
194	drm_encoder_init(drm, &imxpd->encoder, &imx_pd_encoder_funcs,
195			 DRM_MODE_ENCODER_NONE);
196
197	drm_connector_helper_add(&imxpd->connector,
198			&imx_pd_connector_helper_funcs);
199	drm_connector_init(drm, &imxpd->connector, &imx_pd_connector_funcs,
200			   DRM_MODE_CONNECTOR_VGA);
201
202	if (imxpd->panel)
203		drm_panel_attach(imxpd->panel, &imxpd->connector);
204
205	drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
206
207	imxpd->connector.encoder = &imxpd->encoder;
208
209	return 0;
210}
211
212static int imx_pd_bind(struct device *dev, struct device *master, void *data)
213{
214	struct drm_device *drm = data;
215	struct device_node *np = dev->of_node;
216	struct device_node *port;
217	const u8 *edidp;
218	struct imx_parallel_display *imxpd;
219	int ret;
220	const char *fmt;
221
222	imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
223	if (!imxpd)
224		return -ENOMEM;
225
226	edidp = of_get_property(np, "edid", &imxpd->edid_len);
227	if (edidp)
228		imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
229
230	ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
231	if (!ret) {
232		if (!strcmp(fmt, "rgb24"))
233			imxpd->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
234		else if (!strcmp(fmt, "rgb565"))
235			imxpd->bus_format = MEDIA_BUS_FMT_RGB565_1X16;
236		else if (!strcmp(fmt, "bgr666"))
237			imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
238		else if (!strcmp(fmt, "lvds666"))
239			imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
240	}
241
242	/* port@1 is the output port */
243	port = of_graph_get_port_by_id(np, 1);
244	if (port) {
245		struct device_node *endpoint, *remote;
246
247		endpoint = of_get_child_by_name(port, "endpoint");
248		if (endpoint) {
249			remote = of_graph_get_remote_port_parent(endpoint);
250			if (remote)
251				imxpd->panel = of_drm_find_panel(remote);
252			if (!imxpd->panel)
253				return -EPROBE_DEFER;
254		}
255	}
256
257	imxpd->dev = dev;
258
259	ret = imx_pd_register(drm, imxpd);
260	if (ret)
261		return ret;
262
263	dev_set_drvdata(dev, imxpd);
264
265	return 0;
266}
267
268static void imx_pd_unbind(struct device *dev, struct device *master,
269	void *data)
270{
271	struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
272
273	imxpd->encoder.funcs->destroy(&imxpd->encoder);
274	imxpd->connector.funcs->destroy(&imxpd->connector);
275
276	kfree(imxpd->edid);
277}
278
279static const struct component_ops imx_pd_ops = {
280	.bind	= imx_pd_bind,
281	.unbind	= imx_pd_unbind,
282};
283
284static int imx_pd_probe(struct platform_device *pdev)
285{
286	return component_add(&pdev->dev, &imx_pd_ops);
287}
288
289static int imx_pd_remove(struct platform_device *pdev)
290{
291	component_del(&pdev->dev, &imx_pd_ops);
292
293	return 0;
294}
295
296static const struct of_device_id imx_pd_dt_ids[] = {
297	{ .compatible = "fsl,imx-parallel-display", },
298	{ /* sentinel */ }
299};
300MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
301
302static struct platform_driver imx_pd_driver = {
303	.probe		= imx_pd_probe,
304	.remove		= imx_pd_remove,
305	.driver		= {
306		.of_match_table = imx_pd_dt_ids,
307		.name	= "imx-parallel-display",
308	},
309};
310
311module_platform_driver(imx_pd_driver);
312
313MODULE_DESCRIPTION("i.MX parallel display driver");
314MODULE_AUTHOR("Sascha Hauer, Pengutronix");
315MODULE_LICENSE("GPL");
316MODULE_ALIAS("platform:imx-parallel-display");
317