1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * HDMI Connector driver
4 *
5 * Copyright (C) 2013 Texas Instruments
6 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
7 */
8
9 #include <linux/slab.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/of.h>
13 #include <linux/of_gpio.h>
14
15 #include <drm/drm_edid.h>
16
17 #include <video/omapfb_dss.h>
18
19 static const struct omap_video_timings hdmic_default_timings = {
20 .x_res = 640,
21 .y_res = 480,
22 .pixelclock = 25175000,
23 .hsw = 96,
24 .hfp = 16,
25 .hbp = 48,
26 .vsw = 2,
27 .vfp = 11,
28 .vbp = 31,
29
30 .vsync_level = OMAPDSS_SIG_ACTIVE_LOW,
31 .hsync_level = OMAPDSS_SIG_ACTIVE_LOW,
32
33 .interlace = false,
34 };
35
36 struct panel_drv_data {
37 struct omap_dss_device dssdev;
38 struct omap_dss_device *in;
39
40 struct device *dev;
41
42 struct omap_video_timings timings;
43
44 int hpd_gpio;
45 };
46
47 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
48
hdmic_connect(struct omap_dss_device * dssdev)49 static int hdmic_connect(struct omap_dss_device *dssdev)
50 {
51 struct panel_drv_data *ddata = to_panel_data(dssdev);
52 struct omap_dss_device *in = ddata->in;
53
54 dev_dbg(ddata->dev, "connect\n");
55
56 if (omapdss_device_is_connected(dssdev))
57 return 0;
58
59 return in->ops.hdmi->connect(in, dssdev);
60 }
61
hdmic_disconnect(struct omap_dss_device * dssdev)62 static void hdmic_disconnect(struct omap_dss_device *dssdev)
63 {
64 struct panel_drv_data *ddata = to_panel_data(dssdev);
65 struct omap_dss_device *in = ddata->in;
66
67 dev_dbg(ddata->dev, "disconnect\n");
68
69 if (!omapdss_device_is_connected(dssdev))
70 return;
71
72 in->ops.hdmi->disconnect(in, dssdev);
73 }
74
hdmic_enable(struct omap_dss_device * dssdev)75 static int hdmic_enable(struct omap_dss_device *dssdev)
76 {
77 struct panel_drv_data *ddata = to_panel_data(dssdev);
78 struct omap_dss_device *in = ddata->in;
79 int r;
80
81 dev_dbg(ddata->dev, "enable\n");
82
83 if (!omapdss_device_is_connected(dssdev))
84 return -ENODEV;
85
86 if (omapdss_device_is_enabled(dssdev))
87 return 0;
88
89 in->ops.hdmi->set_timings(in, &ddata->timings);
90
91 r = in->ops.hdmi->enable(in);
92 if (r)
93 return r;
94
95 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
96
97 return r;
98 }
99
hdmic_disable(struct omap_dss_device * dssdev)100 static void hdmic_disable(struct omap_dss_device *dssdev)
101 {
102 struct panel_drv_data *ddata = to_panel_data(dssdev);
103 struct omap_dss_device *in = ddata->in;
104
105 dev_dbg(ddata->dev, "disable\n");
106
107 if (!omapdss_device_is_enabled(dssdev))
108 return;
109
110 in->ops.hdmi->disable(in);
111
112 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
113 }
114
hdmic_set_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)115 static void hdmic_set_timings(struct omap_dss_device *dssdev,
116 struct omap_video_timings *timings)
117 {
118 struct panel_drv_data *ddata = to_panel_data(dssdev);
119 struct omap_dss_device *in = ddata->in;
120
121 ddata->timings = *timings;
122 dssdev->panel.timings = *timings;
123
124 in->ops.hdmi->set_timings(in, timings);
125 }
126
hdmic_get_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)127 static void hdmic_get_timings(struct omap_dss_device *dssdev,
128 struct omap_video_timings *timings)
129 {
130 struct panel_drv_data *ddata = to_panel_data(dssdev);
131
132 *timings = ddata->timings;
133 }
134
hdmic_check_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)135 static int hdmic_check_timings(struct omap_dss_device *dssdev,
136 struct omap_video_timings *timings)
137 {
138 struct panel_drv_data *ddata = to_panel_data(dssdev);
139 struct omap_dss_device *in = ddata->in;
140
141 return in->ops.hdmi->check_timings(in, timings);
142 }
143
hdmic_read_edid(struct omap_dss_device * dssdev,u8 * edid,int len)144 static int hdmic_read_edid(struct omap_dss_device *dssdev,
145 u8 *edid, int len)
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->read_edid(in, edid, len);
151 }
152
hdmic_detect(struct omap_dss_device * dssdev)153 static bool hdmic_detect(struct omap_dss_device *dssdev)
154 {
155 struct panel_drv_data *ddata = to_panel_data(dssdev);
156 struct omap_dss_device *in = ddata->in;
157
158 if (gpio_is_valid(ddata->hpd_gpio))
159 return gpio_get_value_cansleep(ddata->hpd_gpio);
160 else
161 return in->ops.hdmi->detect(in);
162 }
163
hdmic_set_hdmi_mode(struct omap_dss_device * dssdev,bool hdmi_mode)164 static int hdmic_set_hdmi_mode(struct omap_dss_device *dssdev, bool hdmi_mode)
165 {
166 struct panel_drv_data *ddata = to_panel_data(dssdev);
167 struct omap_dss_device *in = ddata->in;
168
169 return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
170 }
171
hdmic_set_infoframe(struct omap_dss_device * dssdev,const struct hdmi_avi_infoframe * avi)172 static int hdmic_set_infoframe(struct omap_dss_device *dssdev,
173 const struct hdmi_avi_infoframe *avi)
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_infoframe(in, avi);
179 }
180
181 static struct omap_dss_driver hdmic_driver = {
182 .connect = hdmic_connect,
183 .disconnect = hdmic_disconnect,
184
185 .enable = hdmic_enable,
186 .disable = hdmic_disable,
187
188 .set_timings = hdmic_set_timings,
189 .get_timings = hdmic_get_timings,
190 .check_timings = hdmic_check_timings,
191
192 .get_resolution = omapdss_default_get_resolution,
193
194 .read_edid = hdmic_read_edid,
195 .detect = hdmic_detect,
196 .set_hdmi_mode = hdmic_set_hdmi_mode,
197 .set_hdmi_infoframe = hdmic_set_infoframe,
198 };
199
hdmic_probe_of(struct platform_device * pdev)200 static int hdmic_probe_of(struct platform_device *pdev)
201 {
202 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
203 struct device_node *node = pdev->dev.of_node;
204 struct omap_dss_device *in;
205 int gpio;
206
207 /* HPD GPIO */
208 gpio = of_get_named_gpio(node, "hpd-gpios", 0);
209 if (gpio_is_valid(gpio))
210 ddata->hpd_gpio = gpio;
211 else
212 ddata->hpd_gpio = -ENODEV;
213
214 in = omapdss_of_find_source_for_first_ep(node);
215 if (IS_ERR(in)) {
216 dev_err(&pdev->dev, "failed to find video source\n");
217 return PTR_ERR(in);
218 }
219
220 ddata->in = in;
221
222 return 0;
223 }
224
hdmic_probe(struct platform_device * pdev)225 static int hdmic_probe(struct platform_device *pdev)
226 {
227 struct panel_drv_data *ddata;
228 struct omap_dss_device *dssdev;
229 int r;
230
231 if (!pdev->dev.of_node)
232 return -ENODEV;
233
234 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
235 if (!ddata)
236 return -ENOMEM;
237
238 platform_set_drvdata(pdev, ddata);
239 ddata->dev = &pdev->dev;
240
241 r = hdmic_probe_of(pdev);
242 if (r)
243 return r;
244
245 if (gpio_is_valid(ddata->hpd_gpio)) {
246 r = devm_gpio_request_one(&pdev->dev, ddata->hpd_gpio,
247 GPIOF_DIR_IN, "hdmi_hpd");
248 if (r)
249 goto err_reg;
250 }
251
252 ddata->timings = hdmic_default_timings;
253
254 dssdev = &ddata->dssdev;
255 dssdev->driver = &hdmic_driver;
256 dssdev->dev = &pdev->dev;
257 dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
258 dssdev->owner = THIS_MODULE;
259 dssdev->panel.timings = hdmic_default_timings;
260
261 r = omapdss_register_display(dssdev);
262 if (r) {
263 dev_err(&pdev->dev, "Failed to register panel\n");
264 goto err_reg;
265 }
266
267 return 0;
268 err_reg:
269 omap_dss_put_device(ddata->in);
270 return r;
271 }
272
hdmic_remove(struct platform_device * pdev)273 static int __exit hdmic_remove(struct platform_device *pdev)
274 {
275 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
276 struct omap_dss_device *dssdev = &ddata->dssdev;
277 struct omap_dss_device *in = ddata->in;
278
279 omapdss_unregister_display(&ddata->dssdev);
280
281 hdmic_disable(dssdev);
282 hdmic_disconnect(dssdev);
283
284 omap_dss_put_device(in);
285
286 return 0;
287 }
288
289 static const struct of_device_id hdmic_of_match[] = {
290 { .compatible = "omapdss,hdmi-connector", },
291 {},
292 };
293
294 MODULE_DEVICE_TABLE(of, hdmic_of_match);
295
296 static struct platform_driver hdmi_connector_driver = {
297 .probe = hdmic_probe,
298 .remove = __exit_p(hdmic_remove),
299 .driver = {
300 .name = "connector-hdmi",
301 .of_match_table = hdmic_of_match,
302 .suppress_bind_attrs = true,
303 },
304 };
305
306 module_platform_driver(hdmi_connector_driver);
307
308 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
309 MODULE_DESCRIPTION("HDMI Connector driver");
310 MODULE_LICENSE("GPL");
311