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		dev_err(dev->dev, "allocation failed\n");
116		return NULL;
117	}
118
119	tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
120	tfp410_encoder->mod = mod;
121
122	encoder = &tfp410_encoder->base;
123	encoder->possible_crtcs = 1;
124
125	ret = drm_encoder_init(dev, encoder, &tfp410_encoder_funcs,
126			DRM_MODE_ENCODER_TMDS, NULL);
127	if (ret < 0)
128		goto fail;
129
130	drm_encoder_helper_add(encoder, &tfp410_encoder_helper_funcs);
131
132	return encoder;
133
134fail:
135	drm_encoder_cleanup(encoder);
136	return NULL;
137}
138
139/*
140 * Connector:
141 */
142
143struct tfp410_connector {
144	struct drm_connector base;
145
146	struct drm_encoder *encoder;  /* our connected encoder */
147	struct tfp410_module *mod;
148};
149#define to_tfp410_connector(x) container_of(x, struct tfp410_connector, base)
150
151
152static void tfp410_connector_destroy(struct drm_connector *connector)
153{
154	drm_connector_unregister(connector);
155	drm_connector_cleanup(connector);
156}
157
158static enum drm_connector_status tfp410_connector_detect(
159		struct drm_connector *connector,
160		bool force)
161{
162	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
163
164	if (drm_probe_ddc(tfp410_connector->mod->i2c))
165		return connector_status_connected;
166
167	return connector_status_unknown;
168}
169
170static int tfp410_connector_get_modes(struct drm_connector *connector)
171{
172	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
173	struct edid *edid;
174	int ret = 0;
175
176	edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
177
178	drm_mode_connector_update_edid_property(connector, edid);
179
180	if (edid) {
181		ret = drm_add_edid_modes(connector, edid);
182		kfree(edid);
183	}
184
185	return ret;
186}
187
188static int tfp410_connector_mode_valid(struct drm_connector *connector,
189		  struct drm_display_mode *mode)
190{
191	struct tilcdc_drm_private *priv = connector->dev->dev_private;
192	/* our only constraints are what the crtc can generate: */
193	return tilcdc_crtc_mode_valid(priv->crtc, mode);
194}
195
196static struct drm_encoder *tfp410_connector_best_encoder(
197		struct drm_connector *connector)
198{
199	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
200	return tfp410_connector->encoder;
201}
202
203static const struct drm_connector_funcs tfp410_connector_funcs = {
204	.destroy            = tfp410_connector_destroy,
205	.dpms               = drm_atomic_helper_connector_dpms,
206	.detect             = tfp410_connector_detect,
207	.fill_modes         = drm_helper_probe_single_connector_modes,
208	.reset              = drm_atomic_helper_connector_reset,
209	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
210	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
211};
212
213static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
214	.get_modes          = tfp410_connector_get_modes,
215	.mode_valid         = tfp410_connector_mode_valid,
216	.best_encoder       = tfp410_connector_best_encoder,
217};
218
219static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
220		struct tfp410_module *mod, struct drm_encoder *encoder)
221{
222	struct tfp410_connector *tfp410_connector;
223	struct drm_connector *connector;
224	int ret;
225
226	tfp410_connector = devm_kzalloc(dev->dev, sizeof(*tfp410_connector),
227					GFP_KERNEL);
228	if (!tfp410_connector) {
229		dev_err(dev->dev, "allocation failed\n");
230		return NULL;
231	}
232
233	tfp410_connector->encoder = encoder;
234	tfp410_connector->mod = mod;
235
236	connector = &tfp410_connector->base;
237
238	drm_connector_init(dev, connector, &tfp410_connector_funcs,
239			DRM_MODE_CONNECTOR_DVID);
240	drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
241
242	connector->polled = DRM_CONNECTOR_POLL_CONNECT |
243			DRM_CONNECTOR_POLL_DISCONNECT;
244
245	connector->interlace_allowed = 0;
246	connector->doublescan_allowed = 0;
247
248	ret = drm_mode_connector_attach_encoder(connector, encoder);
249	if (ret)
250		goto fail;
251
252	return connector;
253
254fail:
255	tfp410_connector_destroy(connector);
256	return NULL;
257}
258
259/*
260 * Module:
261 */
262
263static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
264{
265	struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
266	struct tilcdc_drm_private *priv = dev->dev_private;
267	struct drm_encoder *encoder;
268	struct drm_connector *connector;
269
270	encoder = tfp410_encoder_create(dev, tfp410_mod);
271	if (!encoder)
272		return -ENOMEM;
273
274	connector = tfp410_connector_create(dev, tfp410_mod, encoder);
275	if (!connector)
276		return -ENOMEM;
277
278	priv->encoders[priv->num_encoders++] = encoder;
279	priv->connectors[priv->num_connectors++] = connector;
280
281	tilcdc_crtc_set_panel_info(priv->crtc, &dvi_info);
282	return 0;
283}
284
285static const struct tilcdc_module_ops tfp410_module_ops = {
286		.modeset_init = tfp410_modeset_init,
287};
288
289/*
290 * Device:
291 */
292
293static struct of_device_id tfp410_of_match[];
294
295static int tfp410_probe(struct platform_device *pdev)
296{
297	struct device_node *node = pdev->dev.of_node;
298	struct device_node *i2c_node;
299	struct tfp410_module *tfp410_mod;
300	struct tilcdc_module *mod;
301	struct pinctrl *pinctrl;
302	uint32_t i2c_phandle;
303	int ret = -EINVAL;
304
305	/* bail out early if no DT data: */
306	if (!node) {
307		dev_err(&pdev->dev, "device-tree data is missing\n");
308		return -ENXIO;
309	}
310
311	tfp410_mod = devm_kzalloc(&pdev->dev, sizeof(*tfp410_mod), GFP_KERNEL);
312	if (!tfp410_mod)
313		return -ENOMEM;
314
315	mod = &tfp410_mod->base;
316	pdev->dev.platform_data = mod;
317
318	tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
319
320	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
321	if (IS_ERR(pinctrl))
322		dev_warn(&pdev->dev, "pins are not configured\n");
323
324	if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
325		dev_err(&pdev->dev, "could not get i2c bus phandle\n");
326		goto fail;
327	}
328
329	i2c_node = of_find_node_by_phandle(i2c_phandle);
330	if (!i2c_node) {
331		dev_err(&pdev->dev, "could not get i2c bus node\n");
332		goto fail;
333	}
334
335	tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
336	if (!tfp410_mod->i2c) {
337		dev_err(&pdev->dev, "could not get i2c\n");
338		of_node_put(i2c_node);
339		goto fail;
340	}
341
342	of_node_put(i2c_node);
343
344	tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
345			0, NULL);
346	if (tfp410_mod->gpio < 0) {
347		dev_warn(&pdev->dev, "No power down GPIO\n");
348	} else {
349		ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
350		if (ret) {
351			dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
352			goto fail_adapter;
353		}
354	}
355
356	return 0;
357
358fail_adapter:
359	i2c_put_adapter(tfp410_mod->i2c);
360
361fail:
362	tilcdc_module_cleanup(mod);
363	return ret;
364}
365
366static int tfp410_remove(struct platform_device *pdev)
367{
368	struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
369	struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
370
371	i2c_put_adapter(tfp410_mod->i2c);
372	gpio_free(tfp410_mod->gpio);
373
374	tilcdc_module_cleanup(mod);
375
376	return 0;
377}
378
379static struct of_device_id tfp410_of_match[] = {
380		{ .compatible = "ti,tilcdc,tfp410", },
381		{ },
382};
383
384struct platform_driver tfp410_driver = {
385	.probe = tfp410_probe,
386	.remove = tfp410_remove,
387	.driver = {
388		.owner = THIS_MODULE,
389		.name = "tfp410",
390		.of_match_table = tfp410_of_match,
391	},
392};
393
394int __init tilcdc_tfp410_init(void)
395{
396	return platform_driver_register(&tfp410_driver);
397}
398
399void __exit tilcdc_tfp410_fini(void)
400{
401	platform_driver_unregister(&tfp410_driver);
402}