2 * Generic DVI Connector driver
4 * Copyright (C) 2013 Texas Instruments
5 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
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.
12 #include <linux/i2c.h>
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/slab.h>
17 #include <drm/drm_edid.h>
19 #include <video/omapdss.h>
20 #include <video/omap-panel-data.h>
22 static const struct omap_video_timings dvic_default_timings = {
26 .pixelclock = 23500000,
36 .vsync_level = OMAPDSS_SIG_ACTIVE_HIGH,
37 .hsync_level = OMAPDSS_SIG_ACTIVE_HIGH,
38 .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
39 .de_level = OMAPDSS_SIG_ACTIVE_HIGH,
40 .sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES,
43 struct panel_drv_data {
44 struct omap_dss_device dssdev;
45 struct omap_dss_device *in;
47 struct omap_video_timings timings;
49 struct i2c_adapter *i2c_adapter;
52 #define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
54 static int dvic_connect(struct omap_dss_device *dssdev)
56 struct panel_drv_data *ddata = to_panel_data(dssdev);
57 struct omap_dss_device *in = ddata->in;
60 if (omapdss_device_is_connected(dssdev))
63 r = in->ops.dvi->connect(in, dssdev);
70 static void dvic_disconnect(struct omap_dss_device *dssdev)
72 struct panel_drv_data *ddata = to_panel_data(dssdev);
73 struct omap_dss_device *in = ddata->in;
75 if (!omapdss_device_is_connected(dssdev))
78 in->ops.dvi->disconnect(in, dssdev);
81 static int dvic_enable(struct omap_dss_device *dssdev)
83 struct panel_drv_data *ddata = to_panel_data(dssdev);
84 struct omap_dss_device *in = ddata->in;
87 if (!omapdss_device_is_connected(dssdev))
90 if (omapdss_device_is_enabled(dssdev))
93 in->ops.dvi->set_timings(in, &ddata->timings);
95 r = in->ops.dvi->enable(in);
99 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
104 static void dvic_disable(struct omap_dss_device *dssdev)
106 struct panel_drv_data *ddata = to_panel_data(dssdev);
107 struct omap_dss_device *in = ddata->in;
109 if (!omapdss_device_is_enabled(dssdev))
112 in->ops.dvi->disable(in);
114 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
117 static void dvic_set_timings(struct omap_dss_device *dssdev,
118 struct omap_video_timings *timings)
120 struct panel_drv_data *ddata = to_panel_data(dssdev);
121 struct omap_dss_device *in = ddata->in;
123 ddata->timings = *timings;
124 dssdev->panel.timings = *timings;
126 in->ops.dvi->set_timings(in, timings);
129 static void dvic_get_timings(struct omap_dss_device *dssdev,
130 struct omap_video_timings *timings)
132 struct panel_drv_data *ddata = to_panel_data(dssdev);
134 *timings = ddata->timings;
137 static int dvic_check_timings(struct omap_dss_device *dssdev,
138 struct omap_video_timings *timings)
140 struct panel_drv_data *ddata = to_panel_data(dssdev);
141 struct omap_dss_device *in = ddata->in;
143 return in->ops.dvi->check_timings(in, timings);
146 static int dvic_ddc_read(struct i2c_adapter *adapter,
147 unsigned char *buf, u16 count, u8 offset)
151 for (retries = 3; retries > 0; retries--) {
152 struct i2c_msg msgs[] = {
166 r = i2c_transfer(adapter, msgs, 2);
174 return r < 0 ? r : -EIO;
177 static int dvic_read_edid(struct omap_dss_device *dssdev,
180 struct panel_drv_data *ddata = to_panel_data(dssdev);
181 int r, l, bytes_read;
183 if (!ddata->i2c_adapter)
186 l = min(EDID_LENGTH, len);
187 r = dvic_ddc_read(ddata->i2c_adapter, edid, l, 0);
193 /* if there are extensions, read second block */
194 if (len > EDID_LENGTH && edid[0x7e] > 0) {
195 l = min(EDID_LENGTH, len - EDID_LENGTH);
197 r = dvic_ddc_read(ddata->i2c_adapter, edid + EDID_LENGTH,
208 static bool dvic_detect(struct omap_dss_device *dssdev)
210 struct panel_drv_data *ddata = to_panel_data(dssdev);
214 if (!ddata->i2c_adapter)
217 r = dvic_ddc_read(ddata->i2c_adapter, &out, 1, 0);
222 static struct omap_dss_driver dvic_driver = {
223 .connect = dvic_connect,
224 .disconnect = dvic_disconnect,
226 .enable = dvic_enable,
227 .disable = dvic_disable,
229 .set_timings = dvic_set_timings,
230 .get_timings = dvic_get_timings,
231 .check_timings = dvic_check_timings,
233 .get_resolution = omapdss_default_get_resolution,
235 .read_edid = dvic_read_edid,
236 .detect = dvic_detect,
239 static int dvic_probe_pdata(struct platform_device *pdev)
241 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
242 struct connector_dvi_platform_data *pdata;
243 struct omap_dss_device *in, *dssdev;
246 pdata = dev_get_platdata(&pdev->dev);
247 i2c_bus_num = pdata->i2c_bus_num;
249 if (i2c_bus_num != -1) {
250 struct i2c_adapter *adapter;
252 adapter = i2c_get_adapter(i2c_bus_num);
255 "Failed to get I2C adapter, bus %d\n",
257 return -EPROBE_DEFER;
260 ddata->i2c_adapter = adapter;
263 in = omap_dss_find_output(pdata->source);
265 i2c_put_adapter(ddata->i2c_adapter);
267 dev_err(&pdev->dev, "Failed to find video source\n");
268 return -EPROBE_DEFER;
273 dssdev = &ddata->dssdev;
274 dssdev->name = pdata->name;
279 static int dvic_probe_of(struct platform_device *pdev)
281 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
282 struct device_node *node = pdev->dev.of_node;
283 struct omap_dss_device *in;
284 struct device_node *adapter_node;
285 struct i2c_adapter *adapter;
287 in = omapdss_of_find_source_for_first_ep(node);
289 dev_err(&pdev->dev, "failed to find video source\n");
295 adapter_node = of_parse_phandle(node, "ddc-i2c-bus", 0);
297 adapter = of_find_i2c_adapter_by_node(adapter_node);
298 if (adapter == NULL) {
299 dev_err(&pdev->dev, "failed to parse ddc-i2c-bus\n");
300 omap_dss_put_device(ddata->in);
301 return -EPROBE_DEFER;
304 ddata->i2c_adapter = adapter;
310 static int dvic_probe(struct platform_device *pdev)
312 struct panel_drv_data *ddata;
313 struct omap_dss_device *dssdev;
316 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
320 platform_set_drvdata(pdev, ddata);
322 if (dev_get_platdata(&pdev->dev)) {
323 r = dvic_probe_pdata(pdev);
326 } else if (pdev->dev.of_node) {
327 r = dvic_probe_of(pdev);
334 ddata->timings = dvic_default_timings;
336 dssdev = &ddata->dssdev;
337 dssdev->driver = &dvic_driver;
338 dssdev->dev = &pdev->dev;
339 dssdev->type = OMAP_DISPLAY_TYPE_DVI;
340 dssdev->owner = THIS_MODULE;
341 dssdev->panel.timings = dvic_default_timings;
343 r = omapdss_register_display(dssdev);
345 dev_err(&pdev->dev, "Failed to register panel\n");
352 omap_dss_put_device(ddata->in);
354 i2c_put_adapter(ddata->i2c_adapter);
359 static int __exit dvic_remove(struct platform_device *pdev)
361 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
362 struct omap_dss_device *dssdev = &ddata->dssdev;
363 struct omap_dss_device *in = ddata->in;
365 omapdss_unregister_display(&ddata->dssdev);
367 dvic_disable(dssdev);
368 dvic_disconnect(dssdev);
370 omap_dss_put_device(in);
372 i2c_put_adapter(ddata->i2c_adapter);
377 static const struct of_device_id dvic_of_match[] = {
378 { .compatible = "omapdss,dvi-connector", },
382 MODULE_DEVICE_TABLE(of, dvic_of_match);
384 static struct platform_driver dvi_connector_driver = {
386 .remove = __exit_p(dvic_remove),
388 .name = "connector-dvi",
389 .of_match_table = dvic_of_match,
390 .suppress_bind_attrs = true,
394 module_platform_driver(dvi_connector_driver);
396 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
397 MODULE_DESCRIPTION("Generic DVI Connector driver");
398 MODULE_LICENSE("GPL");