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/gpio.h>
 20#include <linux/of_gpio.h>
 21#include <linux/pinctrl/pinmux.h>
 22#include <linux/pinctrl/consumer.h>
 23
 24#include "tilcdc_drv.h"
 25
 26struct tfp410_module {
 27	struct tilcdc_module base;
 28	struct i2c_adapter *i2c;
 29	int gpio;
 30};
 31#define to_tfp410_module(x) container_of(x, struct tfp410_module, base)
 32
 33
 34static const struct tilcdc_panel_info dvi_info = {
 35		.ac_bias                = 255,
 36		.ac_bias_intrpt         = 0,
 37		.dma_burst_sz           = 16,
 38		.bpp                    = 16,
 39		.fdd                    = 0x80,
 40		.tft_alt_mode           = 0,
 41		.sync_edge              = 0,
 42		.sync_ctrl              = 1,
 43		.raster_order           = 0,
 44};
 45
 46/*
 47 * Encoder:
 48 */
 49
 50struct tfp410_encoder {
 51	struct drm_encoder base;
 52	struct tfp410_module *mod;
 53	int dpms;
 54};
 55#define to_tfp410_encoder(x) container_of(x, struct tfp410_encoder, base)
 56
 57
 58static void tfp410_encoder_destroy(struct drm_encoder *encoder)
 59{
 60	struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
 61	drm_encoder_cleanup(encoder);
 62	kfree(tfp410_encoder);
 63}
 64
 65static void tfp410_encoder_dpms(struct drm_encoder *encoder, int mode)
 66{
 67	struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
 68
 69	if (tfp410_encoder->dpms == mode)
 70		return;
 71
 72	if (mode == DRM_MODE_DPMS_ON) {
 73		DBG("Power on");
 74		gpio_direction_output(tfp410_encoder->mod->gpio, 1);
 75	} else {
 76		DBG("Power off");
 77		gpio_direction_output(tfp410_encoder->mod->gpio, 0);
 78	}
 79
 80	tfp410_encoder->dpms = mode;
 81}
 82
 83static bool tfp410_encoder_mode_fixup(struct drm_encoder *encoder,
 84		const struct drm_display_mode *mode,
 85		struct drm_display_mode *adjusted_mode)
 86{
 87	/* nothing needed */
 88	return true;
 89}
 90
 91static void tfp410_encoder_prepare(struct drm_encoder *encoder)
 92{
 93	tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
 94	tilcdc_crtc_set_panel_info(encoder->crtc, &dvi_info);
 95}
 96
 97static void tfp410_encoder_commit(struct drm_encoder *encoder)
 98{
 99	tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
100}
101
102static void tfp410_encoder_mode_set(struct drm_encoder *encoder,
103		struct drm_display_mode *mode,
104		struct drm_display_mode *adjusted_mode)
105{
106	/* nothing needed */
107}
108
109static const struct drm_encoder_funcs tfp410_encoder_funcs = {
110		.destroy        = tfp410_encoder_destroy,
111};
112
113static const struct drm_encoder_helper_funcs tfp410_encoder_helper_funcs = {
114		.dpms           = tfp410_encoder_dpms,
115		.mode_fixup     = tfp410_encoder_mode_fixup,
116		.prepare        = tfp410_encoder_prepare,
117		.commit         = tfp410_encoder_commit,
118		.mode_set       = tfp410_encoder_mode_set,
119};
120
121static struct drm_encoder *tfp410_encoder_create(struct drm_device *dev,
122		struct tfp410_module *mod)
123{
124	struct tfp410_encoder *tfp410_encoder;
125	struct drm_encoder *encoder;
126	int ret;
127
128	tfp410_encoder = kzalloc(sizeof(*tfp410_encoder), GFP_KERNEL);
129	if (!tfp410_encoder) {
130		dev_err(dev->dev, "allocation failed\n");
131		return NULL;
132	}
133
134	tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
135	tfp410_encoder->mod = mod;
136
137	encoder = &tfp410_encoder->base;
138	encoder->possible_crtcs = 1;
139
140	ret = drm_encoder_init(dev, encoder, &tfp410_encoder_funcs,
141			DRM_MODE_ENCODER_TMDS);
142	if (ret < 0)
143		goto fail;
144
145	drm_encoder_helper_add(encoder, &tfp410_encoder_helper_funcs);
146
147	return encoder;
148
149fail:
150	tfp410_encoder_destroy(encoder);
151	return NULL;
152}
153
154/*
155 * Connector:
156 */
157
158struct tfp410_connector {
159	struct drm_connector base;
160
161	struct drm_encoder *encoder;  /* our connected encoder */
162	struct tfp410_module *mod;
163};
164#define to_tfp410_connector(x) container_of(x, struct tfp410_connector, base)
165
166
167static void tfp410_connector_destroy(struct drm_connector *connector)
168{
169	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
170	drm_connector_cleanup(connector);
171	kfree(tfp410_connector);
172}
173
174static enum drm_connector_status tfp410_connector_detect(
175		struct drm_connector *connector,
176		bool force)
177{
178	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
179
180	if (drm_probe_ddc(tfp410_connector->mod->i2c))
181		return connector_status_connected;
182
183	return connector_status_unknown;
184}
185
186static int tfp410_connector_get_modes(struct drm_connector *connector)
187{
188	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
189	struct edid *edid;
190	int ret = 0;
191
192	edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
193
194	drm_mode_connector_update_edid_property(connector, edid);
195
196	if (edid) {
197		ret = drm_add_edid_modes(connector, edid);
198		kfree(edid);
199	}
200
201	return ret;
202}
203
204static int tfp410_connector_mode_valid(struct drm_connector *connector,
205		  struct drm_display_mode *mode)
206{
207	struct tilcdc_drm_private *priv = connector->dev->dev_private;
208	/* our only constraints are what the crtc can generate: */
209	return tilcdc_crtc_mode_valid(priv->crtc, mode);
210}
211
212static struct drm_encoder *tfp410_connector_best_encoder(
213		struct drm_connector *connector)
214{
215	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
216	return tfp410_connector->encoder;
217}
218
219static const struct drm_connector_funcs tfp410_connector_funcs = {
220	.destroy            = tfp410_connector_destroy,
221	.dpms               = drm_helper_connector_dpms,
222	.detect             = tfp410_connector_detect,
223	.fill_modes         = drm_helper_probe_single_connector_modes,
224};
225
226static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
227	.get_modes          = tfp410_connector_get_modes,
228	.mode_valid         = tfp410_connector_mode_valid,
229	.best_encoder       = tfp410_connector_best_encoder,
230};
231
232static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
233		struct tfp410_module *mod, struct drm_encoder *encoder)
234{
235	struct tfp410_connector *tfp410_connector;
236	struct drm_connector *connector;
237	int ret;
238
239	tfp410_connector = kzalloc(sizeof(*tfp410_connector), GFP_KERNEL);
240	if (!tfp410_connector) {
241		dev_err(dev->dev, "allocation failed\n");
242		return NULL;
243	}
244
245	tfp410_connector->encoder = encoder;
246	tfp410_connector->mod = mod;
247
248	connector = &tfp410_connector->base;
249
250	drm_connector_init(dev, connector, &tfp410_connector_funcs,
251			DRM_MODE_CONNECTOR_DVID);
252	drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
253
254	connector->polled = DRM_CONNECTOR_POLL_CONNECT |
255			DRM_CONNECTOR_POLL_DISCONNECT;
256
257	connector->interlace_allowed = 0;
258	connector->doublescan_allowed = 0;
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	tfp410_connector_destroy(connector);
270	return NULL;
271}
272
273/*
274 * Module:
275 */
276
277static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
278{
279	struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
280	struct tilcdc_drm_private *priv = dev->dev_private;
281	struct drm_encoder *encoder;
282	struct drm_connector *connector;
283
284	encoder = tfp410_encoder_create(dev, tfp410_mod);
285	if (!encoder)
286		return -ENOMEM;
287
288	connector = tfp410_connector_create(dev, tfp410_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 tfp410_destroy(struct tilcdc_module *mod)
299{
300	struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
301
302	if (tfp410_mod->i2c)
303		i2c_put_adapter(tfp410_mod->i2c);
304
305	if (!IS_ERR_VALUE(tfp410_mod->gpio))
306		gpio_free(tfp410_mod->gpio);
307
308	tilcdc_module_cleanup(mod);
309	kfree(tfp410_mod);
310}
311
312static const struct tilcdc_module_ops tfp410_module_ops = {
313		.modeset_init = tfp410_modeset_init,
314		.destroy = tfp410_destroy,
315};
316
317/*
318 * Device:
319 */
320
321static struct of_device_id tfp410_of_match[];
322
323static int tfp410_probe(struct platform_device *pdev)
324{
325	struct device_node *node = pdev->dev.of_node;
326	struct device_node *i2c_node;
327	struct tfp410_module *tfp410_mod;
328	struct tilcdc_module *mod;
329	struct pinctrl *pinctrl;
330	uint32_t i2c_phandle;
331	int ret = -EINVAL;
332
333	/* bail out early if no DT data: */
334	if (!node) {
335		dev_err(&pdev->dev, "device-tree data is missing\n");
336		return -ENXIO;
337	}
338
339	tfp410_mod = kzalloc(sizeof(*tfp410_mod), GFP_KERNEL);
340	if (!tfp410_mod)
341		return -ENOMEM;
342
343	mod = &tfp410_mod->base;
344
345	tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
346
347	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
348	if (IS_ERR(pinctrl))
349		dev_warn(&pdev->dev, "pins are not configured\n");
350
351	if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
352		dev_err(&pdev->dev, "could not get i2c bus phandle\n");
353		goto fail;
354	}
355
356	mod->preferred_bpp = dvi_info.bpp;
357
358	i2c_node = of_find_node_by_phandle(i2c_phandle);
359	if (!i2c_node) {
360		dev_err(&pdev->dev, "could not get i2c bus node\n");
361		goto fail;
362	}
363
364	tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
365	if (!tfp410_mod->i2c) {
366		dev_err(&pdev->dev, "could not get i2c\n");
367		goto fail;
368	}
369
370	of_node_put(i2c_node);
371
372	tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
373			0, NULL);
374	if (IS_ERR_VALUE(tfp410_mod->gpio)) {
375		dev_warn(&pdev->dev, "No power down GPIO\n");
376	} else {
377		ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
378		if (ret) {
379			dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
380			goto fail;
381		}
382	}
383
384	return 0;
385
386fail:
387	tfp410_destroy(mod);
388	return ret;
389}
390
391static int tfp410_remove(struct platform_device *pdev)
392{
393	return 0;
394}
395
396static struct of_device_id tfp410_of_match[] = {
397		{ .compatible = "ti,tilcdc,tfp410", },
398		{ },
399};
400
401struct platform_driver tfp410_driver = {
402	.probe = tfp410_probe,
403	.remove = tfp410_remove,
404	.driver = {
405		.owner = THIS_MODULE,
406		.name = "tfp410",
407		.of_match_table = tfp410_of_match,
408	},
409};
410
411int __init tilcdc_tfp410_init(void)
412{
413	return platform_driver_register(&tfp410_driver);
414}
415
416void __exit tilcdc_tfp410_fini(void)
417{
418	platform_driver_unregister(&tfp410_driver);
419}