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9#include <linux/i2c.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/slab.h>
13
14#include <drm/drm_edid.h>
15
16#include <video/omapfb_dss.h>
17
18static const struct omap_video_timings dvic_default_timings = {
19 .x_res = 640,
20 .y_res = 480,
21
22 .pixelclock = 23500000,
23
24 .hfp = 48,
25 .hsw = 32,
26 .hbp = 80,
27
28 .vfp = 3,
29 .vsw = 4,
30 .vbp = 7,
31
32 .vsync_level = OMAPDSS_SIG_ACTIVE_HIGH,
33 .hsync_level = OMAPDSS_SIG_ACTIVE_HIGH,
34 .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
35 .de_level = OMAPDSS_SIG_ACTIVE_HIGH,
36 .sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
37};
38
39struct panel_drv_data {
40 struct omap_dss_device dssdev;
41 struct omap_dss_device *in;
42
43 struct omap_video_timings timings;
44
45 struct i2c_adapter *i2c_adapter;
46};
47
48#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)
49
50static int dvic_connect(struct omap_dss_device *dssdev)
51{
52 struct panel_drv_data *ddata = to_panel_data(dssdev);
53 struct omap_dss_device *in = ddata->in;
54
55 if (omapdss_device_is_connected(dssdev))
56 return 0;
57
58 return in->ops.dvi->connect(in, dssdev);
59}
60
61static void dvic_disconnect(struct omap_dss_device *dssdev)
62{
63 struct panel_drv_data *ddata = to_panel_data(dssdev);
64 struct omap_dss_device *in = ddata->in;
65
66 if (!omapdss_device_is_connected(dssdev))
67 return;
68
69 in->ops.dvi->disconnect(in, dssdev);
70}
71
72static int dvic_enable(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 int r;
77
78 if (!omapdss_device_is_connected(dssdev))
79 return -ENODEV;
80
81 if (omapdss_device_is_enabled(dssdev))
82 return 0;
83
84 in->ops.dvi->set_timings(in, &ddata->timings);
85
86 r = in->ops.dvi->enable(in);
87 if (r)
88 return r;
89
90 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
91
92 return 0;
93}
94
95static void dvic_disable(struct omap_dss_device *dssdev)
96{
97 struct panel_drv_data *ddata = to_panel_data(dssdev);
98 struct omap_dss_device *in = ddata->in;
99
100 if (!omapdss_device_is_enabled(dssdev))
101 return;
102
103 in->ops.dvi->disable(in);
104
105 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
106}
107
108static void dvic_set_timings(struct omap_dss_device *dssdev,
109 struct omap_video_timings *timings)
110{
111 struct panel_drv_data *ddata = to_panel_data(dssdev);
112 struct omap_dss_device *in = ddata->in;
113
114 ddata->timings = *timings;
115 dssdev->panel.timings = *timings;
116
117 in->ops.dvi->set_timings(in, timings);
118}
119
120static void dvic_get_timings(struct omap_dss_device *dssdev,
121 struct omap_video_timings *timings)
122{
123 struct panel_drv_data *ddata = to_panel_data(dssdev);
124
125 *timings = ddata->timings;
126}
127
128static int dvic_check_timings(struct omap_dss_device *dssdev,
129 struct omap_video_timings *timings)
130{
131 struct panel_drv_data *ddata = to_panel_data(dssdev);
132 struct omap_dss_device *in = ddata->in;
133
134 return in->ops.dvi->check_timings(in, timings);
135}
136
137static int dvic_ddc_read(struct i2c_adapter *adapter,
138 unsigned char *buf, u16 count, u8 offset)
139{
140 int r, retries;
141
142 for (retries = 3; retries > 0; retries--) {
143 struct i2c_msg msgs[] = {
144 {
145 .addr = DDC_ADDR,
146 .flags = 0,
147 .len = 1,
148 .buf = &offset,
149 }, {
150 .addr = DDC_ADDR,
151 .flags = I2C_M_RD,
152 .len = count,
153 .buf = buf,
154 }
155 };
156
157 r = i2c_transfer(adapter, msgs, 2);
158 if (r == 2)
159 return 0;
160
161 if (r != -EAGAIN)
162 break;
163 }
164
165 return r < 0 ? r : -EIO;
166}
167
168static int dvic_read_edid(struct omap_dss_device *dssdev,
169 u8 *edid, int len)
170{
171 struct panel_drv_data *ddata = to_panel_data(dssdev);
172 int r, l, bytes_read;
173
174 if (!ddata->i2c_adapter)
175 return -ENODEV;
176
177 l = min(EDID_LENGTH, len);
178 r = dvic_ddc_read(ddata->i2c_adapter, edid, l, 0);
179 if (r)
180 return r;
181
182 bytes_read = l;
183
184
185 if (len > EDID_LENGTH && edid[0x7e] > 0) {
186 l = min(EDID_LENGTH, len - EDID_LENGTH);
187
188 r = dvic_ddc_read(ddata->i2c_adapter, edid + EDID_LENGTH,
189 l, EDID_LENGTH);
190 if (r)
191 return r;
192
193 bytes_read += l;
194 }
195
196 return bytes_read;
197}
198
199static bool dvic_detect(struct omap_dss_device *dssdev)
200{
201 struct panel_drv_data *ddata = to_panel_data(dssdev);
202 unsigned char out;
203 int r;
204
205 if (!ddata->i2c_adapter)
206 return true;
207
208 r = dvic_ddc_read(ddata->i2c_adapter, &out, 1, 0);
209
210 return r == 0;
211}
212
213static struct omap_dss_driver dvic_driver = {
214 .connect = dvic_connect,
215 .disconnect = dvic_disconnect,
216
217 .enable = dvic_enable,
218 .disable = dvic_disable,
219
220 .set_timings = dvic_set_timings,
221 .get_timings = dvic_get_timings,
222 .check_timings = dvic_check_timings,
223
224 .get_resolution = omapdss_default_get_resolution,
225
226 .read_edid = dvic_read_edid,
227 .detect = dvic_detect,
228};
229
230static int dvic_probe_of(struct platform_device *pdev)
231{
232 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
233 struct device_node *node = pdev->dev.of_node;
234 struct omap_dss_device *in;
235 struct device_node *adapter_node;
236 struct i2c_adapter *adapter;
237
238 in = omapdss_of_find_source_for_first_ep(node);
239 if (IS_ERR(in)) {
240 dev_err(&pdev->dev, "failed to find video source\n");
241 return PTR_ERR(in);
242 }
243
244 ddata->in = in;
245
246 adapter_node = of_parse_phandle(node, "ddc-i2c-bus", 0);
247 if (adapter_node) {
248 adapter = of_get_i2c_adapter_by_node(adapter_node);
249 if (adapter == NULL) {
250 dev_err(&pdev->dev, "failed to parse ddc-i2c-bus\n");
251 omap_dss_put_device(ddata->in);
252 return -EPROBE_DEFER;
253 }
254
255 ddata->i2c_adapter = adapter;
256 }
257
258 return 0;
259}
260
261static int dvic_probe(struct platform_device *pdev)
262{
263 struct panel_drv_data *ddata;
264 struct omap_dss_device *dssdev;
265 int r;
266
267 if (!pdev->dev.of_node)
268 return -ENODEV;
269
270 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
271 if (!ddata)
272 return -ENOMEM;
273
274 platform_set_drvdata(pdev, ddata);
275
276 r = dvic_probe_of(pdev);
277 if (r)
278 return r;
279
280 ddata->timings = dvic_default_timings;
281
282 dssdev = &ddata->dssdev;
283 dssdev->driver = &dvic_driver;
284 dssdev->dev = &pdev->dev;
285 dssdev->type = OMAP_DISPLAY_TYPE_DVI;
286 dssdev->owner = THIS_MODULE;
287 dssdev->panel.timings = dvic_default_timings;
288
289 r = omapdss_register_display(dssdev);
290 if (r) {
291 dev_err(&pdev->dev, "Failed to register panel\n");
292 goto err_reg;
293 }
294
295 return 0;
296
297err_reg:
298 omap_dss_put_device(ddata->in);
299
300 i2c_put_adapter(ddata->i2c_adapter);
301
302 return r;
303}
304
305static int __exit dvic_remove(struct platform_device *pdev)
306{
307 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
308 struct omap_dss_device *dssdev = &ddata->dssdev;
309 struct omap_dss_device *in = ddata->in;
310
311 omapdss_unregister_display(&ddata->dssdev);
312
313 dvic_disable(dssdev);
314 dvic_disconnect(dssdev);
315
316 omap_dss_put_device(in);
317
318 i2c_put_adapter(ddata->i2c_adapter);
319
320 return 0;
321}
322
323static const struct of_device_id dvic_of_match[] = {
324 { .compatible = "omapdss,dvi-connector", },
325 {},
326};
327
328MODULE_DEVICE_TABLE(of, dvic_of_match);
329
330static struct platform_driver dvi_connector_driver = {
331 .probe = dvic_probe,
332 .remove = __exit_p(dvic_remove),
333 .driver = {
334 .name = "connector-dvi",
335 .of_match_table = dvic_of_match,
336 .suppress_bind_attrs = true,
337 },
338};
339
340module_platform_driver(dvi_connector_driver);
341
342MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
343MODULE_DESCRIPTION("Generic DVI Connector driver");
344MODULE_LICENSE("GPL");
345
