[go: nahoru, domu]
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_unregister(connector);
171	drm_connector_cleanup(connector);
172	kfree(tfp410_connector);
173}
174
175static enum drm_connector_status tfp410_connector_detect(
176		struct drm_connector *connector,
177		bool force)
178{
179	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
180
181	if (drm_probe_ddc(tfp410_connector->mod->i2c))
182		return connector_status_connected;
183
184	return connector_status_unknown;
185}
186
187static int tfp410_connector_get_modes(struct drm_connector *connector)
188{
189	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
190	struct edid *edid;
191	int ret = 0;
192
193	edid = drm_get_edid(connector, tfp410_connector->mod->i2c);
194
195	drm_mode_connector_update_edid_property(connector, edid);
196
197	if (edid) {
198		ret = drm_add_edid_modes(connector, edid);
199		kfree(edid);
200	}
201
202	return ret;
203}
204
205static int tfp410_connector_mode_valid(struct drm_connector *connector,
206		  struct drm_display_mode *mode)
207{
208	struct tilcdc_drm_private *priv = connector->dev->dev_private;
209	/* our only constraints are what the crtc can generate: */
210	return tilcdc_crtc_mode_valid(priv->crtc, mode);
211}
212
213static struct drm_encoder *tfp410_connector_best_encoder(
214		struct drm_connector *connector)
215{
216	struct tfp410_connector *tfp410_connector = to_tfp410_connector(connector);
217	return tfp410_connector->encoder;
218}
219
220static const struct drm_connector_funcs tfp410_connector_funcs = {
221	.destroy            = tfp410_connector_destroy,
222	.dpms               = drm_helper_connector_dpms,
223	.detect             = tfp410_connector_detect,
224	.fill_modes         = drm_helper_probe_single_connector_modes,
225};
226
227static const struct drm_connector_helper_funcs tfp410_connector_helper_funcs = {
228	.get_modes          = tfp410_connector_get_modes,
229	.mode_valid         = tfp410_connector_mode_valid,
230	.best_encoder       = tfp410_connector_best_encoder,
231};
232
233static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
234		struct tfp410_module *mod, struct drm_encoder *encoder)
235{
236	struct tfp410_connector *tfp410_connector;
237	struct drm_connector *connector;
238	int ret;
239
240	tfp410_connector = kzalloc(sizeof(*tfp410_connector), GFP_KERNEL);
241	if (!tfp410_connector) {
242		dev_err(dev->dev, "allocation failed\n");
243		return NULL;
244	}
245
246	tfp410_connector->encoder = encoder;
247	tfp410_connector->mod = mod;
248
249	connector = &tfp410_connector->base;
250
251	drm_connector_init(dev, connector, &tfp410_connector_funcs,
252			DRM_MODE_CONNECTOR_DVID);
253	drm_connector_helper_add(connector, &tfp410_connector_helper_funcs);
254
255	connector->polled = DRM_CONNECTOR_POLL_CONNECT |
256			DRM_CONNECTOR_POLL_DISCONNECT;
257
258	connector->interlace_allowed = 0;
259	connector->doublescan_allowed = 0;
260
261	ret = drm_mode_connector_attach_encoder(connector, encoder);
262	if (ret)
263		goto fail;
264
265	drm_connector_register(connector);
266
267	return connector;
268
269fail:
270	tfp410_connector_destroy(connector);
271	return NULL;
272}
273
274/*
275 * Module:
276 */
277
278static int tfp410_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
279{
280	struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
281	struct tilcdc_drm_private *priv = dev->dev_private;
282	struct drm_encoder *encoder;
283	struct drm_connector *connector;
284
285	encoder = tfp410_encoder_create(dev, tfp410_mod);
286	if (!encoder)
287		return -ENOMEM;
288
289	connector = tfp410_connector_create(dev, tfp410_mod, encoder);
290	if (!connector)
291		return -ENOMEM;
292
293	priv->encoders[priv->num_encoders++] = encoder;
294	priv->connectors[priv->num_connectors++] = connector;
295
296	return 0;
297}
298
299static const struct tilcdc_module_ops tfp410_module_ops = {
300		.modeset_init = tfp410_modeset_init,
301};
302
303/*
304 * Device:
305 */
306
307static struct of_device_id tfp410_of_match[];
308
309static int tfp410_probe(struct platform_device *pdev)
310{
311	struct device_node *node = pdev->dev.of_node;
312	struct device_node *i2c_node;
313	struct tfp410_module *tfp410_mod;
314	struct tilcdc_module *mod;
315	struct pinctrl *pinctrl;
316	uint32_t i2c_phandle;
317	int ret = -EINVAL;
318
319	/* bail out early if no DT data: */
320	if (!node) {
321		dev_err(&pdev->dev, "device-tree data is missing\n");
322		return -ENXIO;
323	}
324
325	tfp410_mod = kzalloc(sizeof(*tfp410_mod), GFP_KERNEL);
326	if (!tfp410_mod)
327		return -ENOMEM;
328
329	mod = &tfp410_mod->base;
330	pdev->dev.platform_data = mod;
331
332	tilcdc_module_init(mod, "tfp410", &tfp410_module_ops);
333
334	pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
335	if (IS_ERR(pinctrl))
336		dev_warn(&pdev->dev, "pins are not configured\n");
337
338	if (of_property_read_u32(node, "i2c", &i2c_phandle)) {
339		dev_err(&pdev->dev, "could not get i2c bus phandle\n");
340		goto fail;
341	}
342
343	mod->preferred_bpp = dvi_info.bpp;
344
345	i2c_node = of_find_node_by_phandle(i2c_phandle);
346	if (!i2c_node) {
347		dev_err(&pdev->dev, "could not get i2c bus node\n");
348		goto fail;
349	}
350
351	tfp410_mod->i2c = of_find_i2c_adapter_by_node(i2c_node);
352	if (!tfp410_mod->i2c) {
353		dev_err(&pdev->dev, "could not get i2c\n");
354		of_node_put(i2c_node);
355		goto fail;
356	}
357
358	of_node_put(i2c_node);
359
360	tfp410_mod->gpio = of_get_named_gpio_flags(node, "powerdn-gpio",
361			0, NULL);
362	if (IS_ERR_VALUE(tfp410_mod->gpio)) {
363		dev_warn(&pdev->dev, "No power down GPIO\n");
364	} else {
365		ret = gpio_request(tfp410_mod->gpio, "DVI_PDn");
366		if (ret) {
367			dev_err(&pdev->dev, "could not get DVI_PDn gpio\n");
368			goto fail_adapter;
369		}
370	}
371
372	return 0;
373
374fail_adapter:
375	i2c_put_adapter(tfp410_mod->i2c);
376
377fail:
378	kfree(tfp410_mod);
379	tilcdc_module_cleanup(mod);
380	return ret;
381}
382
383static int tfp410_remove(struct platform_device *pdev)
384{
385	struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
386	struct tfp410_module *tfp410_mod = to_tfp410_module(mod);
387
388	i2c_put_adapter(tfp410_mod->i2c);
389	gpio_free(tfp410_mod->gpio);
390
391	tilcdc_module_cleanup(mod);
392	kfree(tfp410_mod);
393
394	return 0;
395}
396
397static struct of_device_id tfp410_of_match[] = {
398		{ .compatible = "ti,tilcdc,tfp410", },
399		{ },
400};
401
402struct platform_driver tfp410_driver = {
403	.probe = tfp410_probe,
404	.remove = tfp410_remove,
405	.driver = {
406		.owner = THIS_MODULE,
407		.name = "tfp410",
408		.of_match_table = tfp410_of_match,
409	},
410};
411
412int __init tilcdc_tfp410_init(void)
413{
414	return platform_driver_register(&tfp410_driver);
415}
416
417void __exit tilcdc_tfp410_fini(void)
418{
419	platform_driver_unregister(&tfp410_driver);
420}
421