1/*
  2 * HDMI Connector driver
  3 *
  4 * Copyright (C) 2013 Texas Instruments
  5 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
  6 *
  7 * This program is free software; you can redistribute it and/or modify it
  8 * under the terms of the GNU General Public License version 2 as published by
  9 * the Free Software Foundation.
 10 */
 11
 12#include <linux/slab.h>
 13#include <linux/module.h>
 14#include <linux/platform_device.h>
 15#include <linux/of.h>
 16#include <linux/of_gpio.h>
 17
 18#include <drm/drm_edid.h>
 19
 20#include <video/omapdss.h>
 21#include <video/omap-panel-data.h>
 22
 23static const struct omap_video_timings hdmic_default_timings = {
 24	.x_res		= 640,
 25	.y_res		= 480,
 26	.pixelclock	= 25175000,
 27	.hsw		= 96,
 28	.hfp		= 16,
 29	.hbp		= 48,
 30	.vsw		= 2,
 31	.vfp		= 11,
 32	.vbp		= 31,
 33
 34	.vsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
 35	.hsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
 36
 37	.interlace	= false,
 38};
 39
 40struct panel_drv_data {
 41	struct omap_dss_device dssdev;
 42	struct omap_dss_device *in;
 43
 44	struct device *dev;
 45
 46	struct omap_video_timings timings;
 47
 48	int hpd_gpio;
 49};
 50
 51#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
 52
 53static int hdmic_connect(struct omap_dss_device *dssdev)
 54{
 55	struct panel_drv_data *ddata = to_panel_data(dssdev);
 56	struct omap_dss_device *in = ddata->in;
 57	int r;
 58
 59	dev_dbg(ddata->dev, "connect\n");
 60
 61	if (omapdss_device_is_connected(dssdev))
 62		return 0;
 63
 64	r = in->ops.hdmi->connect(in, dssdev);
 65	if (r)
 66		return r;
 67
 68	return 0;
 69}
 70
 71static void hdmic_disconnect(struct omap_dss_device *dssdev)
 72{
 73	struct panel_drv_data *ddata = to_panel_data(dssdev);
 74	struct omap_dss_device *in = ddata->in;
 75
 76	dev_dbg(ddata->dev, "disconnect\n");
 77
 78	if (!omapdss_device_is_connected(dssdev))
 79		return;
 80
 81	in->ops.hdmi->disconnect(in, dssdev);
 82}
 83
 84static int hdmic_enable(struct omap_dss_device *dssdev)
 85{
 86	struct panel_drv_data *ddata = to_panel_data(dssdev);
 87	struct omap_dss_device *in = ddata->in;
 88	int r;
 89
 90	dev_dbg(ddata->dev, "enable\n");
 91
 92	if (!omapdss_device_is_connected(dssdev))
 93		return -ENODEV;
 94
 95	if (omapdss_device_is_enabled(dssdev))
 96		return 0;
 97
 98	in->ops.hdmi->set_timings(in, &ddata->timings);
 99
100	r = in->ops.hdmi->enable(in);
101	if (r)
102		return r;
103
104	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
105
106	return r;
107}
108
109static void hdmic_disable(struct omap_dss_device *dssdev)
110{
111	struct panel_drv_data *ddata = to_panel_data(dssdev);
112	struct omap_dss_device *in = ddata->in;
113
114	dev_dbg(ddata->dev, "disable\n");
115
116	if (!omapdss_device_is_enabled(dssdev))
117		return;
118
119	in->ops.hdmi->disable(in);
120
121	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
122}
123
124static void hdmic_set_timings(struct omap_dss_device *dssdev,
125		struct omap_video_timings *timings)
126{
127	struct panel_drv_data *ddata = to_panel_data(dssdev);
128	struct omap_dss_device *in = ddata->in;
129
130	ddata->timings = *timings;
131	dssdev->panel.timings = *timings;
132
133	in->ops.hdmi->set_timings(in, timings);
134}
135
136static void hdmic_get_timings(struct omap_dss_device *dssdev,
137		struct omap_video_timings *timings)
138{
139	struct panel_drv_data *ddata = to_panel_data(dssdev);
140
141	*timings = ddata->timings;
142}
143
144static int hdmic_check_timings(struct omap_dss_device *dssdev,
145		struct omap_video_timings *timings)
146{
147	struct panel_drv_data *ddata = to_panel_data(dssdev);
148	struct omap_dss_device *in = ddata->in;
149
150	return in->ops.hdmi->check_timings(in, timings);
151}
152
153static int hdmic_read_edid(struct omap_dss_device *dssdev,
154		u8 *edid, int len)
155{
156	struct panel_drv_data *ddata = to_panel_data(dssdev);
157	struct omap_dss_device *in = ddata->in;
158
159	return in->ops.hdmi->read_edid(in, edid, len);
160}
161
162static bool hdmic_detect(struct omap_dss_device *dssdev)
163{
164	struct panel_drv_data *ddata = to_panel_data(dssdev);
165	struct omap_dss_device *in = ddata->in;
166
167	if (gpio_is_valid(ddata->hpd_gpio))
168		return gpio_get_value_cansleep(ddata->hpd_gpio);
169	else
170		return in->ops.hdmi->detect(in);
171}
172
173static int hdmic_set_hdmi_mode(struct omap_dss_device *dssdev, bool hdmi_mode)
174{
175	struct panel_drv_data *ddata = to_panel_data(dssdev);
176	struct omap_dss_device *in = ddata->in;
177
178	return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
179}
180
181static int hdmic_set_infoframe(struct omap_dss_device *dssdev,
182		const struct hdmi_avi_infoframe *avi)
183{
184	struct panel_drv_data *ddata = to_panel_data(dssdev);
185	struct omap_dss_device *in = ddata->in;
186
187	return in->ops.hdmi->set_infoframe(in, avi);
188}
189
190static struct omap_dss_driver hdmic_driver = {
191	.connect		= hdmic_connect,
192	.disconnect		= hdmic_disconnect,
193
194	.enable			= hdmic_enable,
195	.disable		= hdmic_disable,
196
197	.set_timings		= hdmic_set_timings,
198	.get_timings		= hdmic_get_timings,
199	.check_timings		= hdmic_check_timings,
200
201	.get_resolution		= omapdss_default_get_resolution,
202
203	.read_edid		= hdmic_read_edid,
204	.detect			= hdmic_detect,
205	.set_hdmi_mode		= hdmic_set_hdmi_mode,
206	.set_hdmi_infoframe	= hdmic_set_infoframe,
207};
208
209static int hdmic_probe_of(struct platform_device *pdev)
210{
211	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
212	struct device_node *node = pdev->dev.of_node;
213	struct omap_dss_device *in;
214	int gpio;
215
216	/* HPD GPIO */
217	gpio = of_get_named_gpio(node, "hpd-gpios", 0);
218	if (gpio_is_valid(gpio))
219		ddata->hpd_gpio = gpio;
220	else
221		ddata->hpd_gpio = -ENODEV;
222
223	in = omapdss_of_find_source_for_first_ep(node);
224	if (IS_ERR(in)) {
225		dev_err(&pdev->dev, "failed to find video source\n");
226		return PTR_ERR(in);
227	}
228
229	ddata->in = in;
230
231	return 0;
232}
233
234static int hdmic_probe(struct platform_device *pdev)
235{
236	struct panel_drv_data *ddata;
237	struct omap_dss_device *dssdev;
238	int r;
239
240	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
241	if (!ddata)
242		return -ENOMEM;
243
244	platform_set_drvdata(pdev, ddata);
245	ddata->dev = &pdev->dev;
246
247	if (!pdev->dev.of_node)
248		return -ENODEV;
249
250	r = hdmic_probe_of(pdev);
251	if (r)
252		return r;
253
254	if (gpio_is_valid(ddata->hpd_gpio)) {
255		r = devm_gpio_request_one(&pdev->dev, ddata->hpd_gpio,
256				GPIOF_DIR_IN, "hdmi_hpd");
257		if (r)
258			goto err_reg;
259	}
260
261	ddata->timings = hdmic_default_timings;
262
263	dssdev = &ddata->dssdev;
264	dssdev->driver = &hdmic_driver;
265	dssdev->dev = &pdev->dev;
266	dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
267	dssdev->owner = THIS_MODULE;
268	dssdev->panel.timings = hdmic_default_timings;
269
270	r = omapdss_register_display(dssdev);
271	if (r) {
272		dev_err(&pdev->dev, "Failed to register panel\n");
273		goto err_reg;
274	}
275
276	return 0;
277err_reg:
278	omap_dss_put_device(ddata->in);
279	return r;
280}
281
282static int __exit hdmic_remove(struct platform_device *pdev)
283{
284	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
285	struct omap_dss_device *dssdev = &ddata->dssdev;
286	struct omap_dss_device *in = ddata->in;
287
288	omapdss_unregister_display(&ddata->dssdev);
289
290	hdmic_disable(dssdev);
291	hdmic_disconnect(dssdev);
292
293	omap_dss_put_device(in);
294
295	return 0;
296}
297
298static const struct of_device_id hdmic_of_match[] = {
299	{ .compatible = "omapdss,hdmi-connector", },
300	{},
301};
302
303MODULE_DEVICE_TABLE(of, hdmic_of_match);
304
305static struct platform_driver hdmi_connector_driver = {
306	.probe	= hdmic_probe,
307	.remove	= __exit_p(hdmic_remove),
308	.driver	= {
309		.name	= "connector-hdmi",
310		.of_match_table = hdmic_of_match,
311		.suppress_bind_attrs = true,
312	},
313};
314
315module_platform_driver(hdmi_connector_driver);
316
317MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
318MODULE_DESCRIPTION("HDMI Connector driver");
319MODULE_LICENSE("GPL");