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/gpio/consumer.h>
13 #include <linux/slab.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/of.h>
17 #include <linux/of_gpio.h>
18
19 #include <drm/drm_edid.h>
20 #include <video/omap-panel-data.h>
21
22 #include "../dss/omapdss.h"
23
24 static const struct omap_video_timings hdmic_default_timings = {
25 .x_res = 640,
26 .y_res = 480,
27 .pixelclock = 25175000,
28 .hsw = 96,
29 .hfp = 16,
30 .hbp = 48,
31 .vsw = 2,
32 .vfp = 11,
33 .vbp = 31,
34
35 .vsync_level = OMAPDSS_SIG_ACTIVE_LOW,
36 .hsync_level = OMAPDSS_SIG_ACTIVE_LOW,
37
38 .interlace = false,
39 };
40
41 struct panel_drv_data {
42 struct omap_dss_device dssdev;
43 struct omap_dss_device *in;
44
45 struct device *dev;
46
47 struct omap_video_timings timings;
48
49 int hpd_gpio;
50 };
51
52 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
53
hdmic_connect(struct omap_dss_device * dssdev)54 static int hdmic_connect(struct omap_dss_device *dssdev)
55 {
56 struct panel_drv_data *ddata = to_panel_data(dssdev);
57 struct omap_dss_device *in = ddata->in;
58 int r;
59
60 dev_dbg(ddata->dev, "connect\n");
61
62 if (omapdss_device_is_connected(dssdev))
63 return 0;
64
65 r = in->ops.hdmi->connect(in, dssdev);
66 if (r)
67 return r;
68
69 return 0;
70 }
71
hdmic_disconnect(struct omap_dss_device * dssdev)72 static void hdmic_disconnect(struct omap_dss_device *dssdev)
73 {
74 struct panel_drv_data *ddata = to_panel_data(dssdev);
75 struct omap_dss_device *in = ddata->in;
76
77 dev_dbg(ddata->dev, "disconnect\n");
78
79 if (!omapdss_device_is_connected(dssdev))
80 return;
81
82 in->ops.hdmi->disconnect(in, dssdev);
83 }
84
hdmic_enable(struct omap_dss_device * dssdev)85 static int hdmic_enable(struct omap_dss_device *dssdev)
86 {
87 struct panel_drv_data *ddata = to_panel_data(dssdev);
88 struct omap_dss_device *in = ddata->in;
89 int r;
90
91 dev_dbg(ddata->dev, "enable\n");
92
93 if (!omapdss_device_is_connected(dssdev))
94 return -ENODEV;
95
96 if (omapdss_device_is_enabled(dssdev))
97 return 0;
98
99 in->ops.hdmi->set_timings(in, &ddata->timings);
100
101 r = in->ops.hdmi->enable(in);
102 if (r)
103 return r;
104
105 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
106
107 return r;
108 }
109
hdmic_disable(struct omap_dss_device * dssdev)110 static void hdmic_disable(struct omap_dss_device *dssdev)
111 {
112 struct panel_drv_data *ddata = to_panel_data(dssdev);
113 struct omap_dss_device *in = ddata->in;
114
115 dev_dbg(ddata->dev, "disable\n");
116
117 if (!omapdss_device_is_enabled(dssdev))
118 return;
119
120 in->ops.hdmi->disable(in);
121
122 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
123 }
124
hdmic_set_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)125 static void hdmic_set_timings(struct omap_dss_device *dssdev,
126 struct omap_video_timings *timings)
127 {
128 struct panel_drv_data *ddata = to_panel_data(dssdev);
129 struct omap_dss_device *in = ddata->in;
130
131 ddata->timings = *timings;
132 dssdev->panel.timings = *timings;
133
134 in->ops.hdmi->set_timings(in, timings);
135 }
136
hdmic_get_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)137 static void hdmic_get_timings(struct omap_dss_device *dssdev,
138 struct omap_video_timings *timings)
139 {
140 struct panel_drv_data *ddata = to_panel_data(dssdev);
141
142 *timings = ddata->timings;
143 }
144
hdmic_check_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)145 static int hdmic_check_timings(struct omap_dss_device *dssdev,
146 struct omap_video_timings *timings)
147 {
148 struct panel_drv_data *ddata = to_panel_data(dssdev);
149 struct omap_dss_device *in = ddata->in;
150
151 return in->ops.hdmi->check_timings(in, timings);
152 }
153
hdmic_read_edid(struct omap_dss_device * dssdev,u8 * edid,int len)154 static int hdmic_read_edid(struct omap_dss_device *dssdev,
155 u8 *edid, int len)
156 {
157 struct panel_drv_data *ddata = to_panel_data(dssdev);
158 struct omap_dss_device *in = ddata->in;
159
160 return in->ops.hdmi->read_edid(in, edid, len);
161 }
162
hdmic_detect(struct omap_dss_device * dssdev)163 static bool hdmic_detect(struct omap_dss_device *dssdev)
164 {
165 struct panel_drv_data *ddata = to_panel_data(dssdev);
166 struct omap_dss_device *in = ddata->in;
167
168 if (gpio_is_valid(ddata->hpd_gpio))
169 return gpio_get_value_cansleep(ddata->hpd_gpio);
170 else
171 return in->ops.hdmi->detect(in);
172 }
173
hdmic_set_hdmi_mode(struct omap_dss_device * dssdev,bool hdmi_mode)174 static int hdmic_set_hdmi_mode(struct omap_dss_device *dssdev, bool hdmi_mode)
175 {
176 struct panel_drv_data *ddata = to_panel_data(dssdev);
177 struct omap_dss_device *in = ddata->in;
178
179 return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
180 }
181
hdmic_set_infoframe(struct omap_dss_device * dssdev,const struct hdmi_avi_infoframe * avi)182 static int hdmic_set_infoframe(struct omap_dss_device *dssdev,
183 const struct hdmi_avi_infoframe *avi)
184 {
185 struct panel_drv_data *ddata = to_panel_data(dssdev);
186 struct omap_dss_device *in = ddata->in;
187
188 return in->ops.hdmi->set_infoframe(in, avi);
189 }
190
191 static struct omap_dss_driver hdmic_driver = {
192 .connect = hdmic_connect,
193 .disconnect = hdmic_disconnect,
194
195 .enable = hdmic_enable,
196 .disable = hdmic_disable,
197
198 .set_timings = hdmic_set_timings,
199 .get_timings = hdmic_get_timings,
200 .check_timings = hdmic_check_timings,
201
202 .get_resolution = omapdss_default_get_resolution,
203
204 .read_edid = hdmic_read_edid,
205 .detect = hdmic_detect,
206 .set_hdmi_mode = hdmic_set_hdmi_mode,
207 .set_hdmi_infoframe = hdmic_set_infoframe,
208 };
209
hdmic_probe_of(struct platform_device * pdev)210 static int hdmic_probe_of(struct platform_device *pdev)
211 {
212 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
213 struct device_node *node = pdev->dev.of_node;
214 struct omap_dss_device *in;
215 int gpio;
216
217 /* HPD GPIO */
218 gpio = of_get_named_gpio(node, "hpd-gpios", 0);
219 if (gpio_is_valid(gpio))
220 ddata->hpd_gpio = gpio;
221 else
222 ddata->hpd_gpio = -ENODEV;
223
224 in = omapdss_of_find_source_for_first_ep(node);
225 if (IS_ERR(in)) {
226 dev_err(&pdev->dev, "failed to find video source\n");
227 return PTR_ERR(in);
228 }
229
230 ddata->in = in;
231
232 return 0;
233 }
234
hdmic_probe(struct platform_device * pdev)235 static int hdmic_probe(struct platform_device *pdev)
236 {
237 struct panel_drv_data *ddata;
238 struct omap_dss_device *dssdev;
239 int r;
240
241 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
242 if (!ddata)
243 return -ENOMEM;
244
245 platform_set_drvdata(pdev, ddata);
246 ddata->dev = &pdev->dev;
247
248 if (!pdev->dev.of_node)
249 return -ENODEV;
250
251 r = hdmic_probe_of(pdev);
252 if (r)
253 return r;
254
255 if (gpio_is_valid(ddata->hpd_gpio)) {
256 r = devm_gpio_request_one(&pdev->dev, ddata->hpd_gpio,
257 GPIOF_DIR_IN, "hdmi_hpd");
258 if (r)
259 goto err_reg;
260 }
261
262 ddata->timings = hdmic_default_timings;
263
264 dssdev = &ddata->dssdev;
265 dssdev->driver = &hdmic_driver;
266 dssdev->dev = &pdev->dev;
267 dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
268 dssdev->owner = THIS_MODULE;
269 dssdev->panel.timings = hdmic_default_timings;
270
271 r = omapdss_register_display(dssdev);
272 if (r) {
273 dev_err(&pdev->dev, "Failed to register panel\n");
274 goto err_reg;
275 }
276
277 return 0;
278 err_reg:
279 omap_dss_put_device(ddata->in);
280 return r;
281 }
282
hdmic_remove(struct platform_device * pdev)283 static int __exit hdmic_remove(struct platform_device *pdev)
284 {
285 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
286 struct omap_dss_device *dssdev = &ddata->dssdev;
287 struct omap_dss_device *in = ddata->in;
288
289 omapdss_unregister_display(&ddata->dssdev);
290
291 hdmic_disable(dssdev);
292 hdmic_disconnect(dssdev);
293
294 omap_dss_put_device(in);
295
296 return 0;
297 }
298
299 static const struct of_device_id hdmic_of_match[] = {
300 { .compatible = "omapdss,hdmi-connector", },
301 {},
302 };
303
304 MODULE_DEVICE_TABLE(of, hdmic_of_match);
305
306 static struct platform_driver hdmi_connector_driver = {
307 .probe = hdmic_probe,
308 .remove = __exit_p(hdmic_remove),
309 .driver = {
310 .name = "connector-hdmi",
311 .of_match_table = hdmic_of_match,
312 .suppress_bind_attrs = true,
313 },
314 };
315
316 module_platform_driver(hdmi_connector_driver);
317
318 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
319 MODULE_DESCRIPTION("HDMI Connector driver");
320 MODULE_LICENSE("GPL");
321