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_cleanup(connector);
170	kfree(slave_connector);
171}
172
173static enum drm_connector_status slave_connector_detect(
174		struct drm_connector *connector,
175		bool force)
176{
177	struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
178	return get_slave_funcs(encoder)->detect(encoder, connector);
179}
180
181static int slave_connector_get_modes(struct drm_connector *connector)
182{
183	struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
184	return get_slave_funcs(encoder)->get_modes(encoder, connector);
185}
186
187static int slave_connector_mode_valid(struct drm_connector *connector,
188		  struct drm_display_mode *mode)
189{
190	struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
191	struct tilcdc_drm_private *priv = connector->dev->dev_private;
192	int ret;
193
194	ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
195	if (ret != MODE_OK)
196		return ret;
197
198	return get_slave_funcs(encoder)->mode_valid(encoder, mode);
199}
200
201static struct drm_encoder *slave_connector_best_encoder(
202		struct drm_connector *connector)
203{
204	struct slave_connector *slave_connector = to_slave_connector(connector);
205	return slave_connector->encoder;
206}
207
208static int slave_connector_set_property(struct drm_connector *connector,
209		struct drm_property *property, uint64_t value)
210{
211	struct drm_encoder *encoder = to_slave_connector(connector)->encoder;
212	return get_slave_funcs(encoder)->set_property(encoder,
213			connector, property, value);
214}
215
216static const struct drm_connector_funcs slave_connector_funcs = {
217	.destroy            = slave_connector_destroy,
218	.dpms               = drm_helper_connector_dpms,
219	.detect             = slave_connector_detect,
220	.fill_modes         = drm_helper_probe_single_connector_modes,
221	.set_property       = slave_connector_set_property,
222};
223
224static const struct drm_connector_helper_funcs slave_connector_helper_funcs = {
225	.get_modes          = slave_connector_get_modes,
226	.mode_valid         = slave_connector_mode_valid,
227	.best_encoder       = slave_connector_best_encoder,
228};
229
230static struct drm_connector *slave_connector_create(struct drm_device *dev,
231		struct slave_module *mod, struct drm_encoder *encoder)
232{
233	struct slave_connector *slave_connector;
234	struct drm_connector *connector;
235	int ret;
236
237	slave_connector = kzalloc(sizeof(*slave_connector), GFP_KERNEL);
238	if (!slave_connector) {
239		dev_err(dev->dev, "allocation failed\n");
240		return NULL;
241	}
242
243	slave_connector->encoder = encoder;
244	slave_connector->mod = mod;
245
246	connector = &slave_connector->base;
247
248	drm_connector_init(dev, connector, &slave_connector_funcs,
249			DRM_MODE_CONNECTOR_HDMIA);
250	drm_connector_helper_add(connector, &slave_connector_helper_funcs);
251
252	connector->polled = DRM_CONNECTOR_POLL_CONNECT |
253			DRM_CONNECTOR_POLL_DISCONNECT;
254
255	connector->interlace_allowed = 0;
256	connector->doublescan_allowed = 0;
257
258	get_slave_funcs(encoder)->create_resources(encoder, connector);
259
260	ret = drm_mode_connector_attach_encoder(connector, encoder);
261	if (ret)
262		goto fail;
263
264	drm_sysfs_connector_add(connector);
265
266	return connector;
267
268fail:
269	slave_connector_destroy(connector);
270	return NULL;
271}
272
273/*
274 * Module:
275 */
276
277static int slave_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
278{
279	struct slave_module *slave_mod = to_slave_module(mod);
280	struct tilcdc_drm_private *priv = dev->dev_private;
281	struct drm_encoder *encoder;
282	struct drm_connector *connector;
283
284	encoder = slave_encoder_create(dev, slave_mod);
285	if (!encoder)
286		return -ENOMEM;
287
288	connector = slave_connector_create(dev, slave_mod, encoder);
289	if (!connector)
290		return -ENOMEM;
291
292	priv->encoders[priv->num_encoders++] = encoder;
293	priv->connectors[priv->num_connectors++] = connector;
294
295	return 0;
296}
297
298static void slave_destroy(struct tilcdc_module *mod)
299{
300	struct slave_module *slave_mod = to_slave_module(mod);
301
302	tilcdc_module_cleanup(mod);
303	kfree(slave_mod);
304}
305
306static const struct tilcdc_module_ops slave_module_ops = {
307		.modeset_init = slave_modeset_init,
308		.destroy = slave_destroy,
309};
310
311/*
312 * Device:
313 */
314
315static struct of_device_id slave_of_match[];
316
317static int slave_probe(struct platform_device *pdev)
318{
319	struct device_node *node = pdev->dev.of_node;
320	struct device_node *i2c_node;
321	struct slave_module *slave_mod;
322	struct tilcdc_module *mod;
323	struct pinctrl *pinctrl;
324	uint32_t i2c_phandle;
325	struct i2c_adapter *slavei2c;
326	int ret = -EINVAL;
327
328	/* bail out early if no DT data: */
329	if (!node) {
330		dev_err(&pdev->dev, "device-tree data is missing\n");
331		return -ENXIO;
332	}
333
334	/* Bail out early if i2c not specified */
335	if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
336		dev_err(&pdev->dev, "could not get i2c bus phandle\n");
337		return ret;
338	}
339
340	i2c_node = of_find_node_by_phandle(i2c_phandle);
341	if (!i2c_node) {
342		dev_err(&pdev->dev, "could not get i2c bus node\n");
343		return ret;
344	}
345
346	/* but defer the probe if it can't be initialized it might come later */
347	slavei2c = of_find_i2c_adapter_by_node(i2c_node);
348	of_node_put(i2c_node);
349
350	if (!slavei2c) {
351		ret = -EPROBE_DEFER;
352		tilcdc_slave_probedefer(true);
353		dev_err(&pdev->dev, "could not get i2c\n");
354		return ret;
355	}
356
357	slave_mod = kzalloc(sizeof(*slave_mod), GFP_KERNEL);
358	if (!slave_mod)
359		return -ENOMEM;
360
361	mod = &slave_mod->base;
362
363	mod->preferred_bpp = slave_info.bpp;
364
365	slave_mod->i2c = slavei2c;
366
367	tilcdc_module_init(mod, "slave", &slave_module_ops);
368
369	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
370	if (IS_ERR(pinctrl))
371		dev_warn(&pdev->dev, "pins are not configured\n");
372
373	tilcdc_slave_probedefer(false);
374
375	return 0;
376}
377
378static int slave_remove(struct platform_device *pdev)
379{
380	return 0;
381}
382
383static struct of_device_id slave_of_match[] = {
384		{ .compatible = "ti,tilcdc,slave", },
385		{ },
386};
387
388struct platform_driver slave_driver = {
389	.probe = slave_probe,
390	.remove = slave_remove,
391	.driver = {
392		.owner = THIS_MODULE,
393		.name = "slave",
394		.of_match_table = slave_of_match,
395	},
396};
397
398int __init tilcdc_slave_init(void)
399{
400	return platform_driver_register(&slave_driver);
401}
402
403void __exit tilcdc_slave_fini(void)
404{
405	platform_driver_unregister(&slave_driver);
406}