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
 57static void tfp410_encoder_dpms(struct drm_encoder *encoder, int mode)
 58{
 59	struct tfp410_encoder *tfp410_encoder = to_tfp410_encoder(encoder);
 60
 61	if (tfp410_encoder->dpms == mode)
 62		return;
 63
 64	if (mode == DRM_MODE_DPMS_ON) {
 65		DBG("Power on");
 66		gpio_direction_output(tfp410_encoder->mod->gpio, 1);
 67	} else {
 68		DBG("Power off");
 69		gpio_direction_output(tfp410_encoder->mod->gpio, 0);
 70	}
 71
 72	tfp410_encoder->dpms = mode;
 73}
 74
 75static void tfp410_encoder_prepare(struct drm_encoder *encoder)
 76{
 77	tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
 78	tilcdc_crtc_set_panel_info(encoder->crtc, &dvi_info);
 79}
 80
 81static void tfp410_encoder_commit(struct drm_encoder *encoder)
 82{
 83	tfp410_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
 84}
 85
 86static void tfp410_encoder_mode_set(struct drm_encoder *encoder,
 87		struct drm_display_mode *mode,
 88		struct drm_display_mode *adjusted_mode)
 89{
 90	/* nothing needed */
 91}
 92
 93static const struct drm_encoder_funcs tfp410_encoder_funcs = {
 94		.destroy        = drm_encoder_cleanup,
 95};
 96
 97static const struct drm_encoder_helper_funcs tfp410_encoder_helper_funcs = {
 98		.dpms           = tfp410_encoder_dpms,
 99		.prepare        = tfp410_encoder_prepare,
100		.commit         = tfp410_encoder_commit,
101		.mode_set       = tfp410_encoder_mode_set,
102};
103
104static struct drm_encoder *tfp410_encoder_create(struct drm_device *dev,
105		struct tfp410_module *mod)
106{
107	struct tfp410_encoder *tfp410_encoder;
108	struct drm_encoder *encoder;
109	int ret;
110
111	tfp410_encoder = devm_kzalloc(dev->dev, sizeof(*tfp410_encoder),
112				      GFP_KERNEL);
113	if (!tfp410_encoder) {
114		dev_err(dev->dev, "allocation failed\n");
115		return NULL;
116	}
117
118	tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
119	tfp410_encoder->mod = mod;
120
121	encoder = &tfp410_encoder->base;
122	encoder->possible_crtcs = 1;
123
124	ret = drm_encoder_init(dev, encoder, &tfp410_encoder_funcs,
125			DRM_MODE_ENCODER_TMDS, NULL);
126	if (ret < 0)
127		goto fail;
128
129	drm_encoder_helper_add(encoder, &tfp410_encoder_helper_funcs);
130
131	return encoder;
132
133fail:
134	drm_encoder_cleanup(encoder);
135	return NULL;
136}
137
138/*
139 * Connector:
140 */
141
142struct tfp410_connector {
143	struct drm_connector base;
144
145	struct drm_encoder *encoder;  /* our connected encoder */
146	struct tfp410_module *mod;
147};
148#define to_tfp410_connector(x) container_of(x, struct tfp410_connector, base)
149
150
151static void tfp410_connector_destroy(struct drm_connector *connector)
152{
153	drm_connector_unregister(connector);
154	drm_connector_cleanup(connector);
155}
156
157static enum drm_connector_status tfp410_connector_detect(
158		struct drm_connector *connector,
159		bool force)
160{
161	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
162
163	if (drm_probe_ddc(tfp410_connector->mod->i2c))
164		return connector_status_connected;
165
166	return connector_status_unknown;
167}
168
169static int tfp410_connector_get_modes(struct drm_connector *connector)
170{
171	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
172	struct edid *edid;
173	int ret = 0;
174
175	edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
176
177	drm_mode_connector_update_edid_property(connector, edid);
178
179	if (edid) {
180		ret = drm_add_edid_modes(connector, edid);
181		kfree(edid);
182	}
183
184	return ret;
185}
186
187static int tfp410_connector_mode_valid(struct drm_connector *connector,
188		  struct drm_display_mode *mode)
189{
190	struct tilcdc_drm_private *priv = connector->dev->dev_private;
191	/* our only constraints are what the crtc can generate: */
192	return tilcdc_crtc_mode_valid(priv->crtc, mode);
193}
194
195static struct drm_encoder *tfp410_connector_best_encoder(
196		struct drm_connector *connector)
197{
198	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
199	return tfp410_connector->encoder;
200}
201
202static const struct drm_connector_funcs tfp410_connector_funcs = {
203	.destroy            = tfp410_connector_destroy,
204	.dpms               = drm_helper_connector_dpms,
205	.detect             = tfp410_connector_detect,
206	.fill_modes         = drm_helper_probe_single_connector_modes,
207};
208
209static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
210	.get_modes          = tfp410_connector_get_modes,
211	.mode_valid         = tfp410_connector_mode_valid,
212	.best_encoder       = tfp410_connector_best_encoder,
213};
214
215static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
216		struct tfp410_module *mod, struct drm_encoder *encoder)
217{
218	struct tfp410_connector *tfp410_connector;
219	struct drm_connector *connector;
220	int ret;
221
222	tfp410_connector = devm_kzalloc(dev->dev, sizeof(*tfp410_connector),
223					GFP_KERNEL);
224	if (!tfp410_connector) {
225		dev_err(dev->dev, "allocation failed\n");
226		return NULL;
227	}
228
229	tfp410_connector->encoder = encoder;
230	tfp410_connector->mod = mod;
231
232	connector = &tfp410_connector->base;
233
234	drm_connector_init(dev, connector, &tfp410_connector_funcs,
235			DRM_MODE_CONNECTOR_DVID);
236	drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
237
238	connector->polled = DRM_CONNECTOR_POLL_CONNECT |
239			DRM_CONNECTOR_POLL_DISCONNECT;
240
241	connector->interlace_allowed = 0;
242	connector->doublescan_allowed = 0;
243
244	ret = drm_mode_connector_attach_encoder(connector, encoder);
245	if (ret)
246		goto fail;
247
248	drm_connector_register(connector);
249
250	return connector;
251
252fail:
253	tfp410_connector_destroy(connector);
254	return NULL;
255}
256
257/*
258 * Module:
259 */
260
261static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
262{
263	struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
264	struct tilcdc_drm_private *priv = dev->dev_private;
265	struct drm_encoder *encoder;
266	struct drm_connector *connector;
267
268	encoder = tfp410_encoder_create(dev, tfp410_mod);
269	if (!encoder)
270		return -ENOMEM;
271
272	connector = tfp410_connector_create(dev, tfp410_mod, encoder);
273	if (!connector)
274		return -ENOMEM;
275
276	priv->encoders[priv->num_encoders++] = encoder;
277	priv->connectors[priv->num_connectors++] = connector;
278
279	return 0;
280}
281
282static const struct tilcdc_module_ops tfp410_module_ops = {
283		.modeset_init = tfp410_modeset_init,
284};
285
286/*
287 * Device:
288 */
289
290static struct of_device_id tfp410_of_match[];
291
292static int tfp410_probe(struct platform_device *pdev)
293{
294	struct device_node *node = pdev->dev.of_node;
295	struct device_node *i2c_node;
296	struct tfp410_module *tfp410_mod;
297	struct tilcdc_module *mod;
298	struct pinctrl *pinctrl;
299	uint32_t i2c_phandle;
300	int ret = -EINVAL;
301
302	/* bail out early if no DT data: */
303	if (!node) {
304		dev_err(&pdev->dev, "device-tree data is missing\n");
305		return -ENXIO;
306	}
307
308	tfp410_mod = devm_kzalloc(&pdev->dev, sizeof(*tfp410_mod), GFP_KERNEL);
309	if (!tfp410_mod)
310		return -ENOMEM;
311
312	mod = &tfp410_mod->base;
313	pdev->dev.platform_data = mod;
314
315	tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
316
317	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
318	if (IS_ERR(pinctrl))
319		dev_warn(&pdev->dev, "pins are not configured\n");
320
321	if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
322		dev_err(&pdev->dev, "could not get i2c bus phandle\n");
323		goto fail;
324	}
325
326	mod->preferred_bpp = dvi_info.bpp;
327
328	i2c_node = of_find_node_by_phandle(i2c_phandle);
329	if (!i2c_node) {
330		dev_err(&pdev->dev, "could not get i2c bus node\n");
331		goto fail;
332	}
333
334	tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
335	if (!tfp410_mod->i2c) {
336		dev_err(&pdev->dev, "could not get i2c\n");
337		of_node_put(i2c_node);
338		goto fail;
339	}
340
341	of_node_put(i2c_node);
342
343	tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
344			0, NULL);
345	if (IS_ERR_VALUE(tfp410_mod->gpio)) {
346		dev_warn(&pdev->dev, "No power down GPIO\n");
347	} else {
348		ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
349		if (ret) {
350			dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
351			goto fail_adapter;
352		}
353	}
354
355	return 0;
356
357fail_adapter:
358	i2c_put_adapter(tfp410_mod->i2c);
359
360fail:
361	tilcdc_module_cleanup(mod);
362	return ret;
363}
364
365static int tfp410_remove(struct platform_device *pdev)
366{
367	struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
368	struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
369
370	i2c_put_adapter(tfp410_mod->i2c);
371	gpio_free(tfp410_mod->gpio);
372
373	tilcdc_module_cleanup(mod);
374
375	return 0;
376}
377
378static struct of_device_id tfp410_of_match[] = {
379		{ .compatible = "ti,tilcdc,tfp410", },
380		{ },
381};
382
383struct platform_driver tfp410_driver = {
384	.probe = tfp410_probe,
385	.remove = tfp410_remove,
386	.driver = {
387		.owner = THIS_MODULE,
388		.name = "tfp410",
389		.of_match_table = tfp410_of_match,
390	},
391};
392
393int __init tilcdc_tfp410_init(void)
394{
395	return platform_driver_register(&tfp410_driver);
396}
397
398void __exit tilcdc_tfp410_fini(void)
399{
400	platform_driver_unregister(&tfp410_driver);
401}