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 * You should have received a copy of the GNU General Public License
 16 * along with this program; if not, write to the Free Software
 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 18 * MA 02110-1301, USA.
 19 */
 20
 21#include <linux/component.h>
 22#include <linux/module.h>
 23#include <drm/drmP.h>
 24#include <drm/drm_fb_helper.h>
 25#include <drm/drm_crtc_helper.h>
 26#include <drm/drm_panel.h>
 27#include <linux/videodev2.h>
 28#include <video/of_display_timing.h>
 29
 30#include "imx-drm.h"
 31
 32#define con_to_imxpd(x) container_of(x, struct imx_parallel_display, connector)
 33#define enc_to_imxpd(x) container_of(x, struct imx_parallel_display, encoder)
 34
 35struct imx_parallel_display {
 36	struct drm_connector connector;
 37	struct drm_encoder encoder;
 38	struct device *dev;
 39	void *edid;
 40	int edid_len;
 41	u32 interface_pix_fmt;
 42	int mode_valid;
 43	struct drm_display_mode mode;
 44	struct drm_panel *panel;
 45};
 46
 47static enum drm_connector_status imx_pd_connector_detect(
 48		struct drm_connector *connector, bool force)
 49{
 50	return connector_status_connected;
 51}
 52
 53static int imx_pd_connector_get_modes(struct drm_connector *connector)
 54{
 55	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
 56	struct device_node *np = imxpd->dev->of_node;
 57	int num_modes = 0;
 58
 59	if (imxpd->panel && imxpd->panel->funcs &&
 60	    imxpd->panel->funcs->get_modes) {
 61		num_modes = imxpd->panel->funcs->get_modes(imxpd->panel);
 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		if (!mode)
 74			return -EINVAL;
 75		drm_mode_copy(mode, &imxpd->mode);
 76		mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
 77		drm_mode_probed_add(connector, mode);
 78		num_modes++;
 79	}
 80
 81	if (np) {
 82		struct drm_display_mode *mode = drm_mode_create(connector->dev);
 83		if (!mode)
 84			return -EINVAL;
 85		of_get_drm_display_mode(np, &imxpd->mode, OF_USE_NATIVE_MODE);
 86		drm_mode_copy(mode, &imxpd->mode);
 87		mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
 88		drm_mode_probed_add(connector, mode);
 89		num_modes++;
 90	}
 91
 92	return num_modes;
 93}
 94
 95static struct drm_encoder *imx_pd_connector_best_encoder(
 96		struct drm_connector *connector)
 97{
 98	struct imx_parallel_display *imxpd = con_to_imxpd(connector);
 99
100	return &imxpd->encoder;
101}
102
103static void imx_pd_encoder_dpms(struct drm_encoder *encoder, int mode)
104{
105	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
106
107	if (mode != DRM_MODE_DPMS_ON)
108		drm_panel_disable(imxpd->panel);
109	else
110		drm_panel_enable(imxpd->panel);
111}
112
113static bool imx_pd_encoder_mode_fixup(struct drm_encoder *encoder,
114			   const struct drm_display_mode *mode,
115			   struct drm_display_mode *adjusted_mode)
116{
117	return true;
118}
119
120static void imx_pd_encoder_prepare(struct drm_encoder *encoder)
121{
122	struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
123
124	imx_drm_panel_format(encoder, imxpd->interface_pix_fmt);
125}
126
127static void imx_pd_encoder_commit(struct drm_encoder *encoder)
128{
129}
130
131static void imx_pd_encoder_mode_set(struct drm_encoder *encoder,
132			 struct drm_display_mode *mode,
133			 struct drm_display_mode *adjusted_mode)
134{
135}
136
137static void imx_pd_encoder_disable(struct drm_encoder *encoder)
138{
139}
140
141static struct drm_connector_funcs imx_pd_connector_funcs = {
142	.dpms = drm_helper_connector_dpms,
143	.fill_modes = drm_helper_probe_single_connector_modes,
144	.detect = imx_pd_connector_detect,
145	.destroy = imx_drm_connector_destroy,
146};
147
148static struct drm_connector_helper_funcs imx_pd_connector_helper_funcs = {
149	.get_modes = imx_pd_connector_get_modes,
150	.best_encoder = imx_pd_connector_best_encoder,
151	.mode_valid = imx_drm_connector_mode_valid,
152};
153
154static struct drm_encoder_funcs imx_pd_encoder_funcs = {
155	.destroy = imx_drm_encoder_destroy,
156};
157
158static struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
159	.dpms = imx_pd_encoder_dpms,
160	.mode_fixup = imx_pd_encoder_mode_fixup,
161	.prepare = imx_pd_encoder_prepare,
162	.commit = imx_pd_encoder_commit,
163	.mode_set = imx_pd_encoder_mode_set,
164	.disable = imx_pd_encoder_disable,
165};
166
167static int imx_pd_register(struct drm_device *drm,
168	struct imx_parallel_display *imxpd)
169{
170	int ret;
171
172	ret = imx_drm_encoder_parse_of(drm, &imxpd->encoder,
173				       imxpd->dev->of_node);
174	if (ret)
175		return ret;
176
177	drm_encoder_helper_add(&imxpd->encoder, &imx_pd_encoder_helper_funcs);
178	drm_encoder_init(drm, &imxpd->encoder, &imx_pd_encoder_funcs,
179			 DRM_MODE_ENCODER_NONE);
180
181	drm_connector_helper_add(&imxpd->connector,
182			&imx_pd_connector_helper_funcs);
183	drm_connector_init(drm, &imxpd->connector, &imx_pd_connector_funcs,
184			   DRM_MODE_CONNECTOR_VGA);
185
186	if (imxpd->panel)
187		drm_panel_attach(imxpd->panel, &imxpd->connector);
188
189	drm_mode_connector_attach_encoder(&imxpd->connector, &imxpd->encoder);
190
191	imxpd->connector.encoder = &imxpd->encoder;
192
193	return 0;
194}
195
196static int imx_pd_bind(struct device *dev, struct device *master, void *data)
197{
198	struct drm_device *drm = data;
199	struct device_node *np = dev->of_node;
200	struct device_node *panel_node;
201	const u8 *edidp;
202	struct imx_parallel_display *imxpd;
203	int ret;
204	const char *fmt;
205
206	imxpd = devm_kzalloc(dev, sizeof(*imxpd), GFP_KERNEL);
207	if (!imxpd)
208		return -ENOMEM;
209
210	edidp = of_get_property(np, "edid", &imxpd->edid_len);
211	if (edidp)
212		imxpd->edid = kmemdup(edidp, imxpd->edid_len, GFP_KERNEL);
213
214	ret = of_property_read_string(np, "interface-pix-fmt", &fmt);
215	if (!ret) {
216		if (!strcmp(fmt, "rgb24"))
217			imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB24;
218		else if (!strcmp(fmt, "rgb565"))
219			imxpd->interface_pix_fmt = V4L2_PIX_FMT_RGB565;
220		else if (!strcmp(fmt, "bgr666"))
221			imxpd->interface_pix_fmt = V4L2_PIX_FMT_BGR666;
222	}
223
224	panel_node = of_parse_phandle(np, "fsl,panel", 0);
225	if (panel_node)
226		imxpd->panel = of_drm_find_panel(panel_node);
227
228	imxpd->dev = dev;
229
230	ret = imx_pd_register(drm, imxpd);
231	if (ret)
232		return ret;
233
234	dev_set_drvdata(dev, imxpd);
235
236	return 0;
237}
238
239static void imx_pd_unbind(struct device *dev, struct device *master,
240	void *data)
241{
242	struct imx_parallel_display *imxpd = dev_get_drvdata(dev);
243
244	imxpd->encoder.funcs->destroy(&imxpd->encoder);
245	imxpd->connector.funcs->destroy(&imxpd->connector);
246}
247
248static const struct component_ops imx_pd_ops = {
249	.bind	= imx_pd_bind,
250	.unbind	= imx_pd_unbind,
251};
252
253static int imx_pd_probe(struct platform_device *pdev)
254{
255	return component_add(&pdev->dev, &imx_pd_ops);
256}
257
258static int imx_pd_remove(struct platform_device *pdev)
259{
260	component_del(&pdev->dev, &imx_pd_ops);
261	return 0;
262}
263
264static const struct of_device_id imx_pd_dt_ids[] = {
265	{ .compatible = "fsl,imx-parallel-display", },
266	{ /* sentinel */ }
267};
268MODULE_DEVICE_TABLE(of, imx_pd_dt_ids);
269
270static struct platform_driver imx_pd_driver = {
271	.probe		= imx_pd_probe,
272	.remove		= imx_pd_remove,
273	.driver		= {
274		.of_match_table = imx_pd_dt_ids,
275		.name	= "imx-parallel-display",
276		.owner	= THIS_MODULE,
277	},
278};
279
280module_platform_driver(imx_pd_driver);
281
282MODULE_DESCRIPTION("i.MX parallel display driver");
283MODULE_AUTHOR("Sascha Hauer, Pengutronix");
284MODULE_LICENSE("GPL");
285MODULE_ALIAS("platform:imx-parallel-display");