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 void imx_pd_encoder_prepare(struct drm_encoder *encoder)
116{
117	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
118
119	imx_drm_set_bus_format(encoder, imxpd->bus_format);
120}
121
122static void imx_pd_encoder_commit(struct drm_encoder *encoder)
123{
124	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
125
126	drm_panel_prepare(imxpd->panel);
127	drm_panel_enable(imxpd->panel);
128}
129
130static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
131			 struct drm_display_mode *orig_mode,
132			 struct drm_display_mode *mode)
133{
134}
135
136static void imx_pd_encoder_disable(struct drm_encoder *encoder)
137{
138	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
139
140	drm_panel_disable(imxpd->panel);
141	drm_panel_unprepare(imxpd->panel);
142}
143
144static const struct drm_connector_funcs imx_pd_connector_funcs = {
145	.dpms = drm_helper_connector_dpms,
146	.fill_modes = drm_helper_probe_single_connector_modes,
147	.detect = imx_pd_connector_detect,
148	.destroy = imx_drm_connector_destroy,
149};
150
151static const struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
152	.get_modes = imx_pd_connector_get_modes,
153	.best_encoder = imx_pd_connector_best_encoder,
154};
155
156static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
157	.destroy = imx_drm_encoder_destroy,
158};
159
160static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
161	.dpms = imx_pd_encoder_dpms,
162	.prepare = imx_pd_encoder_prepare,
163	.commit = imx_pd_encoder_commit,
164	.mode_set = imx_pd_encoder_mode_set,
165	.disable = imx_pd_encoder_disable,
166};
167
168static int imx_pd_register(struct drm_device *drm,
169	struct imx_parallel_display *imxpd)
170{
171	int ret;
172
173	ret = imx_drm_encoder_parse_of(drm, &imxpd->encoder,
174				       imxpd->dev->of_node);
175	if (ret)
176		return ret;
177
178	/* set the connector's dpms to OFF so that
179	 * drm_helper_connector_dpms() won't return
180	 * immediately since the current state is ON
181	 * at this point.
182	 */
183	imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
184
185	drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
186	drm_encoder_init(drm, &imxpd->encoder, &imx_pd_encoder_funcs,
187			 DRM_MODE_ENCODER_NONE, NULL);
188
189	drm_connector_helper_add(&imxpd->connector,
190			&imx_pd_connector_helper_funcs);
191	drm_connector_init(drm, &imxpd->connector, &imx_pd_connector_funcs,
192			   DRM_MODE_CONNECTOR_VGA);
193
194	if (imxpd->panel)
195		drm_panel_attach(imxpd->panel, &imxpd->connector);
196
197	drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
198
199	return 0;
200}
201
202static int imx_pd_bind(struct device *dev, struct device *master, void *data)
203{
204	struct drm_device *drm = data;
205	struct device_node *np = dev->of_node;
206	struct device_node *port;
207	const u8 *edidp;
208	struct imx_parallel_display *imxpd;
209	int ret;
210	const char *fmt;
211
212	imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
213	if (!imxpd)
214		return -ENOMEM;
215
216	edidp = of_get_property(np, "edid", &imxpd->edid_len);
217	if (edidp)
218		imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
219
220	ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
221	if (!ret) {
222		if (!strcmp(fmt, "rgb24"))
223			imxpd->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
224		else if (!strcmp(fmt, "rgb565"))
225			imxpd->bus_format = MEDIA_BUS_FMT_RGB565_1X16;
226		else if (!strcmp(fmt, "bgr666"))
227			imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X18;
228		else if (!strcmp(fmt, "lvds666"))
229			imxpd->bus_format = MEDIA_BUS_FMT_RGB666_1X24_CPADHI;
230	}
231
232	/* port@1 is the output port */
233	port = of_graph_get_port_by_id(np, 1);
234	if (port) {
235		struct device_node *endpoint, *remote;
236
237		endpoint = of_get_child_by_name(port, "endpoint");
238		if (endpoint) {
239			remote = of_graph_get_remote_port_parent(endpoint);
240			if (remote)
241				imxpd->panel = of_drm_find_panel(remote);
242			if (!imxpd->panel)
243				return -EPROBE_DEFER;
244		}
245	}
246
247	imxpd->dev = dev;
248
249	ret = imx_pd_register(drm, imxpd);
250	if (ret)
251		return ret;
252
253	dev_set_drvdata(dev, imxpd);
254
255	return 0;
256}
257
258static void imx_pd_unbind(struct device *dev, struct device *master,
259	void *data)
260{
261	struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
262
263	imxpd->encoder.funcs->destroy(&imxpd->encoder);
264	imxpd->connector.funcs->destroy(&imxpd->connector);
265
266	kfree(imxpd->edid);
267}
268
269static const struct component_ops imx_pd_ops = {
270	.bind	= imx_pd_bind,
271	.unbind	= imx_pd_unbind,
272};
273
274static int imx_pd_probe(struct platform_device *pdev)
275{
276	return component_add(&pdev->dev, &imx_pd_ops);
277}
278
279static int imx_pd_remove(struct platform_device *pdev)
280{
281	component_del(&pdev->dev, &imx_pd_ops);
282
283	return 0;
284}
285
286static const struct of_device_id imx_pd_dt_ids[] = {
287	{ .compatible = "fsl,imx-parallel-display", },
288	{ /* sentinel */ }
289};
290MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
291
292static struct platform_driver imx_pd_driver = {
293	.probe		= imx_pd_probe,
294	.remove		= imx_pd_remove,
295	.driver		= {
296		.of_match_table = imx_pd_dt_ids,
297		.name	= "imx-parallel-display",
298	},
299};
300
301module_platform_driver(imx_pd_driver);
302
303MODULE_DESCRIPTION("i.MX parallel display driver");
304MODULE_AUTHOR("Sascha Hauer, Pengutronix");
305MODULE_LICENSE("GPL");
306MODULE_ALIAS("platform:imx-parallel-display");