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#include <drm/drm_atomic_helper.h>
 24
 25#include "tilcdc_drv.h"
 26#include "tilcdc_tfp410.h"
 27
 28struct tfp410_module {
 29	struct tilcdc_module base;
 30	struct i2c_adapter *i2c;
 31	int gpio;
 32};
 33#define to_tfp410_module(x) container_of(x, struct tfp410_module, base)
 34
 35
 36static const struct tilcdc_panel_info dvi_info = {
 37		.ac_bias                = 255,
 38		.ac_bias_intrpt         = 0,
 39		.dma_burst_sz           = 16,
 40		.bpp                    = 16,
 41		.fdd                    = 0x80,
 42		.tft_alt_mode           = 0,
 43		.sync_edge              = 0,
 44		.sync_ctrl              = 1,
 45		.raster_order           = 0,
 46};
 47
 48/*
 49 * Encoder:
 50 */
 51
 52struct tfp410_encoder {
 53	struct drm_encoder base;
 54	struct tfp410_module *mod;
 55	int dpms;
 56};
 57#define to_tfp410_encoder(x) container_of(x, struct tfp410_encoder, base)
 58
 59static void tfp410_encoder_dpms(struct drm_encoder *encoder, int mode)
 60{
 61	struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
 62
 63	if (tfp410_encoder->dpms == mode)
 64		return;
 65
 66	if (mode == DRM_MODE_DPMS_ON) {
 67		DBG("Power on");
 68		gpio_direction_output(tfp410_encoder->mod->gpio, 1);
 69	} else {
 70		DBG("Power off");
 71		gpio_direction_output(tfp410_encoder->mod->gpio, 0);
 72	}
 73
 74	tfp410_encoder->dpms = mode;
 75}
 76
 77static void tfp410_encoder_prepare(struct drm_encoder *encoder)
 78{
 79	tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
 80}
 81
 82static void tfp410_encoder_commit(struct drm_encoder *encoder)
 83{
 84	tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
 85}
 86
 87static void tfp410_encoder_mode_set(struct drm_encoder *encoder,
 88		struct drm_display_mode *mode,
 89		struct drm_display_mode *adjusted_mode)
 90{
 91	/* nothing needed */
 92}
 93
 94static const struct drm_encoder_funcs tfp410_encoder_funcs = {
 95		.destroy        = drm_encoder_cleanup,
 96};
 97
 98static const struct drm_encoder_helper_funcs tfp410_encoder_helper_funcs = {
 99		.dpms           = tfp410_encoder_dpms,
100		.prepare        = tfp410_encoder_prepare,
101		.commit         = tfp410_encoder_commit,
102		.mode_set       = tfp410_encoder_mode_set,
103};
104
105static struct drm_encoder *tfp410_encoder_create(struct drm_device *dev,
106		struct tfp410_module *mod)
107{
108	struct tfp410_encoder *tfp410_encoder;
109	struct drm_encoder *encoder;
110	int ret;
111
112	tfp410_encoder = devm_kzalloc(dev->dev, sizeof(*tfp410_encoder),
113				      GFP_KERNEL);
114	if (!tfp410_encoder)
115		return NULL;
116
117	tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
118	tfp410_encoder->mod = mod;
119
120	encoder = &tfp410_encoder->base;
121	encoder->possible_crtcs = 1;
122
123	ret = drm_encoder_init(dev, encoder, &tfp410_encoder_funcs,
124			DRM_MODE_ENCODER_TMDS, NULL);
125	if (ret < 0)
126		goto fail;
127
128	drm_encoder_helper_add(encoder, &tfp410_encoder_helper_funcs);
129
130	return encoder;
131
132fail:
133	drm_encoder_cleanup(encoder);
134	return NULL;
135}
136
137/*
138 * Connector:
139 */
140
141struct tfp410_connector {
142	struct drm_connector base;
143
144	struct drm_encoder *encoder;  /* our connected encoder */
145	struct tfp410_module *mod;
146};
147#define to_tfp410_connector(x) container_of(x, struct tfp410_connector, base)
148
149
150static void tfp410_connector_destroy(struct drm_connector *connector)
151{
152	drm_connector_unregister(connector);
153	drm_connector_cleanup(connector);
154}
155
156static enum drm_connector_status tfp410_connector_detect(
157		struct drm_connector *connector,
158		bool force)
159{
160	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
161
162	if (drm_probe_ddc(tfp410_connector->mod->i2c))
163		return connector_status_connected;
164
165	return connector_status_unknown;
166}
167
168static int tfp410_connector_get_modes(struct drm_connector *connector)
169{
170	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
171	struct edid *edid;
172	int ret = 0;
173
174	edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
175
176	drm_mode_connector_update_edid_property(connector, edid);
177
178	if (edid) {
179		ret = drm_add_edid_modes(connector, edid);
180		kfree(edid);
181	}
182
183	return ret;
184}
185
186static int tfp410_connector_mode_valid(struct drm_connector *connector,
187		  struct drm_display_mode *mode)
188{
189	struct tilcdc_drm_private *priv = connector->dev->dev_private;
190	/* our only constraints are what the crtc can generate: */
191	return tilcdc_crtc_mode_valid(priv->crtc, mode);
192}
193
194static struct drm_encoder *tfp410_connector_best_encoder(
195		struct drm_connector *connector)
196{
197	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
198	return tfp410_connector->encoder;
199}
200
201static const struct drm_connector_funcs tfp410_connector_funcs = {
202	.destroy            = tfp410_connector_destroy,
203	.detect             = tfp410_connector_detect,
204	.fill_modes         = drm_helper_probe_single_connector_modes,
205	.reset              = drm_atomic_helper_connector_reset,
206	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
207	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
208};
209
210static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
211	.get_modes          = tfp410_connector_get_modes,
212	.mode_valid         = tfp410_connector_mode_valid,
213	.best_encoder       = tfp410_connector_best_encoder,
214};
215
216static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
217		struct tfp410_module *mod, struct drm_encoder *encoder)
218{
219	struct tfp410_connector *tfp410_connector;
220	struct drm_connector *connector;
221	int ret;
222
223	tfp410_connector = devm_kzalloc(dev->dev, sizeof(*tfp410_connector),
224					GFP_KERNEL);
225	if (!tfp410_connector)
226		return NULL;
227
228	tfp410_connector->encoder = encoder;
229	tfp410_connector->mod = mod;
230
231	connector = &tfp410_connector->base;
232
233	drm_connector_init(dev, connector, &tfp410_connector_funcs,
234			DRM_MODE_CONNECTOR_DVID);
235	drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
236
237	connector->polled = DRM_CONNECTOR_POLL_CONNECT |
238			DRM_CONNECTOR_POLL_DISCONNECT;
239
240	connector->interlace_allowed = 0;
241	connector->doublescan_allowed = 0;
242
243	ret = drm_mode_connector_attach_encoder(connector, encoder);
244	if (ret)
245		goto fail;
246
247	return connector;
248
249fail:
250	tfp410_connector_destroy(connector);
251	return NULL;
252}
253
254/*
255 * Module:
256 */
257
258static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
259{
260	struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
261	struct tilcdc_drm_private *priv = dev->dev_private;
262	struct drm_encoder *encoder;
263	struct drm_connector *connector;
264
265	encoder = tfp410_encoder_create(dev, tfp410_mod);
266	if (!encoder)
267		return -ENOMEM;
268
269	connector = tfp410_connector_create(dev, tfp410_mod, encoder);
270	if (!connector)
271		return -ENOMEM;
272
273	priv->encoders[priv->num_encoders++] = encoder;
274	priv->connectors[priv->num_connectors++] = connector;
275
276	tilcdc_crtc_set_panel_info(priv->crtc, &dvi_info);
277	return 0;
278}
279
280static const struct tilcdc_module_ops tfp410_module_ops = {
281		.modeset_init = tfp410_modeset_init,
282};
283
284/*
285 * Device:
286 */
287
288static int tfp410_probe(struct platform_device *pdev)
289{
290	struct device_node *node = pdev->dev.of_node;
291	struct device_node *i2c_node;
292	struct tfp410_module *tfp410_mod;
293	struct tilcdc_module *mod;
294	struct pinctrl *pinctrl;
295	uint32_t i2c_phandle;
296	int ret = -EINVAL;
297
298	/* bail out early if no DT data: */
299	if (!node) {
300		dev_err(&pdev->dev, "device-tree data is missing\n");
301		return -ENXIO;
302	}
303
304	tfp410_mod = devm_kzalloc(&pdev->dev, sizeof(*tfp410_mod), GFP_KERNEL);
305	if (!tfp410_mod)
306		return -ENOMEM;
307
308	mod = &tfp410_mod->base;
309	pdev->dev.platform_data = mod;
310
311	tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
312
313	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
314	if (IS_ERR(pinctrl))
315		dev_warn(&pdev->dev, "pins are not configured\n");
316
317	if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
318		dev_err(&pdev->dev, "could not get i2c bus phandle\n");
319		goto fail;
320	}
321
322	i2c_node = of_find_node_by_phandle(i2c_phandle);
323	if (!i2c_node) {
324		dev_err(&pdev->dev, "could not get i2c bus node\n");
325		goto fail;
326	}
327
328	tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
329	if (!tfp410_mod->i2c) {
330		dev_err(&pdev->dev, "could not get i2c\n");
331		of_node_put(i2c_node);
332		goto fail;
333	}
334
335	of_node_put(i2c_node);
336
337	tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
338			0, NULL);
339	if (tfp410_mod->gpio < 0) {
340		dev_warn(&pdev->dev, "No power down GPIO\n");
341	} else {
342		ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
343		if (ret) {
344			dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
345			goto fail_adapter;
346		}
347	}
348
349	return 0;
350
351fail_adapter:
352	i2c_put_adapter(tfp410_mod->i2c);
353
354fail:
355	tilcdc_module_cleanup(mod);
356	return ret;
357}
358
359static int tfp410_remove(struct platform_device *pdev)
360{
361	struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
362	struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
363
364	i2c_put_adapter(tfp410_mod->i2c);
365	gpio_free(tfp410_mod->gpio);
366
367	tilcdc_module_cleanup(mod);
368
369	return 0;
370}
371
372static const struct of_device_id tfp410_of_match[] = {
373		{ .compatible = "ti,tilcdc,tfp410", },
374		{ },
375};
376
377struct platform_driver tfp410_driver = {
378	.probe = tfp410_probe,
379	.remove = tfp410_remove,
380	.driver = {
381		.owner = THIS_MODULE,
382		.name = "tfp410",
383		.of_match_table = tfp410_of_match,
384	},
385};
386
387int __init tilcdc_tfp410_init(void)
388{
389	return platform_driver_register(&tfp410_driver);
390}
391
392void __exit tilcdc_tfp410_fini(void)
393{
394	platform_driver_unregister(&tfp410_driver);
395}