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/i2c.h>
19#include <linux/pinctrl/pinmux.h>
20#include <linux/pinctrl/consumer.h>
21#include <drm/drm_encoder_slave.h>
22
23#include "tilcdc_drv.h"
24
25struct slave_module {
26	struct tilcdc_module base;
27	struct i2c_adapter *i2c;
28};
29#define to_slave_module(x) container_of(x, struct slave_module, base)
30
31static const struct tilcdc_panel_info slave_info = {
32		.bpp                    = 16,
33		.ac_bias                = 255,
34		.ac_bias_intrpt         = 0,
35		.dma_burst_sz           = 16,
36		.fdd                    = 0x80,
37		.tft_alt_mode           = 0,
38		.sync_edge              = 0,
39		.sync_ctrl              = 1,
40		.raster_order           = 0,
41};
42
43
44/*
45 * Encoder:
46 */
47
48struct slave_encoder {
49	struct drm_encoder_slave base;
50	struct slave_module *mod;
51};
52#define to_slave_encoder(x) container_of(to_encoder_slave(x), struct slave_encoder, base)
53
54static inline struct drm_encoder_slave_funcs *
55get_slave_funcs(struct drm_encoder *enc)
56{
57	return to_encoder_slave(enc)->slave_funcs;
58}
59
60static void slave_encoder_destroy(struct drm_encoder *encoder)
61{
62	struct slave_encoder *slave_encoder = to_slave_encoder(encoder);
63	if (get_slave_funcs(encoder))
64		get_slave_funcs(encoder)->destroy(encoder);
65	drm_encoder_cleanup(encoder);
66	kfree(slave_encoder);
67}
68
69static void slave_encoder_prepare(struct drm_encoder *encoder)
70{
71	drm_i2c_encoder_prepare(encoder);
72	tilcdc_crtc_set_panel_info(encoder->crtc, &slave_info);
73}
74
75static bool slave_encoder_fixup(struct drm_encoder *encoder,
76		const struct drm_display_mode *mode,
77		struct drm_display_mode *adjusted_mode)
78{
79	/*
80	 * tilcdc does not generate VESA-complient sync but aligns
81	 * VS on the second edge of HS instead of first edge.
82	 * We use adjusted_mode, to fixup sync by aligning both rising
83	 * edges and add HSKEW offset to let the slave encoder fix it up.
84	 */
85	adjusted_mode->hskew = mode->hsync_end - mode->hsync_start;
86	adjusted_mode->flags |= DRM_MODE_FLAG_HSKEW;
87
88	if (mode->flags & DRM_MODE_FLAG_NHSYNC) {
89		adjusted_mode->flags |= DRM_MODE_FLAG_PHSYNC;
90		adjusted_mode->flags &= ~DRM_MODE_FLAG_NHSYNC;
91	} else {
92		adjusted_mode->flags |= DRM_MODE_FLAG_NHSYNC;
93		adjusted_mode->flags &= ~DRM_MODE_FLAG_PHSYNC;
94	}
95
96	return drm_i2c_encoder_mode_fixup(encoder, mode, adjusted_mode);
97}
98
99
100static const struct drm_encoder_funcs slave_encoder_funcs = {
101		.destroy        = slave_encoder_destroy,
102};
103
104static const struct drm_encoder_helper_funcs slave_encoder_helper_funcs = {
105		.dpms           = drm_i2c_encoder_dpms,
106		.mode_fixup     = slave_encoder_fixup,
107		.prepare        = slave_encoder_prepare,
108		.commit         = drm_i2c_encoder_commit,
109		.mode_set       = drm_i2c_encoder_mode_set,
110		.save           = drm_i2c_encoder_save,
111		.restore        = drm_i2c_encoder_restore,
112};
113
114static const struct i2c_board_info info = {
115		I2C_BOARD_INFO("tda998x", 0x70)
116};
117
118static struct drm_encoder *slave_encoder_create(struct drm_device *dev,
119		struct slave_module *mod)
120{
121	struct slave_encoder *slave_encoder;
122	struct drm_encoder *encoder;
123	int ret;
124
125	slave_encoder = kzalloc(sizeof(*slave_encoder), GFP_KERNEL);
126	if (!slave_encoder) {
127		dev_err(dev->dev, "allocation failed\n");
128		return NULL;
129	}
130
131	slave_encoder->mod = mod;
132
133	encoder = &slave_encoder->base.base;
134	encoder->possible_crtcs = 1;
135
136	ret = drm_encoder_init(dev, encoder, &slave_encoder_funcs,
137			DRM_MODE_ENCODER_TMDS);
138	if (ret)
139		goto fail;
140
141	drm_encoder_helper_add(encoder, &slave_encoder_helper_funcs);
142
143	ret = drm_i2c_encoder_init(dev, to_encoder_slave(encoder), mod->i2c, &info);
144	if (ret)
145		goto fail;
146
147	return encoder;
148
149fail:
150	slave_encoder_destroy(encoder);
151	return NULL;
152}
153
154/*
155 * Connector:
156 */
157
158struct slave_connector {
159	struct drm_connector base;
160
161	struct drm_encoder *encoder;  /* our connected encoder */
162	struct slave_module *mod;
163};
164#define to_slave_connector(x) container_of(x, struct slave_connector, base)
165
166static void slave_connector_destroy(struct drm_connector *connector)
167{
168	struct slave_connector *slave_connector = to_slave_connector(connector);
169	drm_connector_unregister(connector);
170	drm_connector_cleanup(connector);
171	kfree(slave_connector);
172}
173
174static enum drm_connector_status slave_connector_detect(
175		struct drm_connector *connector,
176		bool force)
177{
178	struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
179	return get_slave_funcs(encoder)->detect(encoder, connector);
180}
181
182static int slave_connector_get_modes(struct drm_connector *connector)
183{
184	struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
185	return get_slave_funcs(encoder)->get_modes(encoder, connector);
186}
187
188static int slave_connector_mode_valid(struct drm_connector *connector,
189		  struct drm_display_mode *mode)
190{
191	struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
192	struct tilcdc_drm_private *priv = connector->dev->dev_private;
193	int ret;
194
195	ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
196	if (ret != MODE_OK)
197		return ret;
198
199	return get_slave_funcs(encoder)->mode_valid(encoder, mode);
200}
201
202static struct drm_encoder *slave_connector_best_encoder(
203		struct drm_connector *connector)
204{
205	struct slave_connector *slave_connector = to_slave_connector(connector);
206	return slave_connector->encoder;
207}
208
209static int slave_connector_set_property(struct drm_connector *connector,
210		struct drm_property *property, uint64_t value)
211{
212	struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
213	return get_slave_funcs(encoder)->set_property(encoder,
214			connector, property, value);
215}
216
217static const struct drm_connector_funcs slave_connector_funcs = {
218	.destroy            = slave_connector_destroy,
219	.dpms               = drm_helper_connector_dpms,
220	.detect             = slave_connector_detect,
221	.fill_modes         = drm_helper_probe_single_connector_modes,
222	.set_property       = slave_connector_set_property,
223};
224
225static const struct drm_connector_helper_funcs slave_connector_helper_funcs = {
226	.get_modes          = slave_connector_get_modes,
227	.mode_valid         = slave_connector_mode_valid,
228	.best_encoder       = slave_connector_best_encoder,
229};
230
231static struct drm_connector *slave_connector_create(struct drm_device *dev,
232		struct slave_module *mod, struct drm_encoder *encoder)
233{
234	struct slave_connector *slave_connector;
235	struct drm_connector *connector;
236	int ret;
237
238	slave_connector = kzalloc(sizeof(*slave_connector), GFP_KERNEL);
239	if (!slave_connector) {
240		dev_err(dev->dev, "allocation failed\n");
241		return NULL;
242	}
243
244	slave_connector->encoder = encoder;
245	slave_connector->mod = mod;
246
247	connector = &slave_connector->base;
248
249	drm_connector_init(dev, connector, &slave_connector_funcs,
250			DRM_MODE_CONNECTOR_HDMIA);
251	drm_connector_helper_add(connector, &slave_connector_helper_funcs);
252
253	connector->polled = DRM_CONNECTOR_POLL_CONNECT |
254			DRM_CONNECTOR_POLL_DISCONNECT;
255
256	connector->interlace_allowed = 0;
257	connector->doublescan_allowed = 0;
258
259	get_slave_funcs(encoder)->create_resources(encoder, connector);
260
261	ret = drm_mode_connector_attach_encoder(connector, encoder);
262	if (ret)
263		goto fail;
264
265	drm_connector_register(connector);
266
267	return connector;
268
269fail:
270	slave_connector_destroy(connector);
271	return NULL;
272}
273
274/*
275 * Module:
276 */
277
278static int slave_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
279{
280	struct slave_module *slave_mod = to_slave_module(mod);
281	struct tilcdc_drm_private *priv = dev->dev_private;
282	struct drm_encoder *encoder;
283	struct drm_connector *connector;
284
285	encoder = slave_encoder_create(dev, slave_mod);
286	if (!encoder)
287		return -ENOMEM;
288
289	connector = slave_connector_create(dev, slave_mod, encoder);
290	if (!connector)
291		return -ENOMEM;
292
293	priv->encoders[priv->num_encoders++] = encoder;
294	priv->connectors[priv->num_connectors++] = connector;
295
296	return 0;
297}
298
299static const struct tilcdc_module_ops slave_module_ops = {
300		.modeset_init = slave_modeset_init,
301};
302
303/*
304 * Device:
305 */
306
307static struct of_device_id slave_of_match[];
308
309static int slave_probe(struct platform_device *pdev)
310{
311	struct device_node *node = pdev->dev.of_node;
312	struct device_node *i2c_node;
313	struct slave_module *slave_mod;
314	struct tilcdc_module *mod;
315	struct pinctrl *pinctrl;
316	uint32_t i2c_phandle;
317	struct i2c_adapter *slavei2c;
318	int ret = -EINVAL;
319
320	/* bail out early if no DT data: */
321	if (!node) {
322		dev_err(&pdev->dev, "device-tree data is missing\n");
323		return -ENXIO;
324	}
325
326	/* Bail out early if i2c not specified */
327	if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
328		dev_err(&pdev->dev, "could not get i2c bus phandle\n");
329		return ret;
330	}
331
332	i2c_node = of_find_node_by_phandle(i2c_phandle);
333	if (!i2c_node) {
334		dev_err(&pdev->dev, "could not get i2c bus node\n");
335		return ret;
336	}
337
338	/* but defer the probe if it can't be initialized it might come later */
339	slavei2c = of_find_i2c_adapter_by_node(i2c_node);
340	of_node_put(i2c_node);
341
342	if (!slavei2c) {
343		ret = -EPROBE_DEFER;
344		tilcdc_slave_probedefer(true);
345		dev_err(&pdev->dev, "could not get i2c\n");
346		return ret;
347	}
348
349	slave_mod = kzalloc(sizeof(*slave_mod), GFP_KERNEL);
350	if (!slave_mod) {
351		ret = -ENOMEM;
352		goto fail_adapter;
353	}
354
355	mod = &slave_mod->base;
356	pdev->dev.platform_data = mod;
357
358	mod->preferred_bpp = slave_info.bpp;
359
360	slave_mod->i2c = slavei2c;
361
362	tilcdc_module_init(mod, "slave", &slave_module_ops);
363
364	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
365	if (IS_ERR(pinctrl))
366		dev_warn(&pdev->dev, "pins are not configured\n");
367
368	tilcdc_slave_probedefer(false);
369
370	return 0;
371
372fail_adapter:
373	i2c_put_adapter(slavei2c);
374	return ret;
375}
376
377static int slave_remove(struct platform_device *pdev)
378{
379	struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
380	struct slave_module *slave_mod = to_slave_module(mod);
381
382	tilcdc_module_cleanup(mod);
383	kfree(slave_mod);
384
385	return 0;
386}
387
388static struct of_device_id slave_of_match[] = {
389		{ .compatible = "ti,tilcdc,slave", },
390		{ },
391};
392
393struct platform_driver slave_driver = {
394	.probe = slave_probe,
395	.remove = slave_remove,
396	.driver = {
397		.owner = THIS_MODULE,
398		.name = "slave",
399		.of_match_table = slave_of_match,
400	},
401};
402
403int __init tilcdc_slave_init(void)
404{
405	return platform_driver_register(&slave_driver);
406}
407
408void __exit tilcdc_slave_fini(void)
409{
410	platform_driver_unregister(&slave_driver);
411}
412