1
2
3
4
5
6
7#include <linux/delay.h>
8#include <linux/fwnode.h>
9#include <linux/gpio/consumer.h>
10#include <linux/irq.h>
11#include <linux/module.h>
12#include <linux/of_graph.h>
13#include <linux/platform_device.h>
14#include <linux/i2c.h>
15
16#include <drm/drmP.h>
17#include <drm/drm_atomic_helper.h>
18#include <drm/drm_crtc.h>
19#include <drm/drm_probe_helper.h>
20
21#define HOTPLUG_DEBOUNCE_MS 1100
22
23struct tfp410 {
24 struct drm_bridge bridge;
25 struct drm_connector connector;
26 unsigned int connector_type;
27
28 u32 bus_format;
29 struct i2c_adapter *ddc;
30 struct gpio_desc *hpd;
31 int hpd_irq;
32 struct delayed_work hpd_work;
33 struct gpio_desc *powerdown;
34
35 struct drm_bridge_timings timings;
36
37 struct device *dev;
38};
39
40static inline struct tfp410 *
41drm_bridge_to_tfp410(struct drm_bridge *bridge)
42{
43 return container_of(bridge, struct tfp410, bridge);
44}
45
46static inline struct tfp410 *
47drm_connector_to_tfp410(struct drm_connector *connector)
48{
49 return container_of(connector, struct tfp410, connector);
50}
51
52static int tfp410_get_modes(struct drm_connector *connector)
53{
54 struct tfp410 *dvi = drm_connector_to_tfp410(connector);
55 struct edid *edid;
56 int ret;
57
58 if (!dvi->ddc)
59 goto fallback;
60
61 edid = drm_get_edid(connector, dvi->ddc);
62 if (!edid) {
63 DRM_INFO("EDID read failed. Fallback to standard modes\n");
64 goto fallback;
65 }
66
67 drm_connector_update_edid_property(connector, edid);
68
69 return drm_add_edid_modes(connector, edid);
70fallback:
71
72 ret = drm_add_modes_noedid(connector, 1920, 1200);
73
74
75 drm_set_preferred_mode(connector, 1024, 768);
76
77 return ret;
78}
79
80static const struct drm_connector_helper_funcs tfp410_con_helper_funcs = {
81 .get_modes = tfp410_get_modes,
82};
83
84static enum drm_connector_status
85tfp410_connector_detect(struct drm_connector *connector, bool force)
86{
87 struct tfp410 *dvi = drm_connector_to_tfp410(connector);
88
89 if (dvi->hpd) {
90 if (gpiod_get_value_cansleep(dvi->hpd))
91 return connector_status_connected;
92 else
93 return connector_status_disconnected;
94 }
95
96 if (dvi->ddc) {
97 if (drm_probe_ddc(dvi->ddc))
98 return connector_status_connected;
99 else
100 return connector_status_disconnected;
101 }
102
103 return connector_status_unknown;
104}
105
106static const struct drm_connector_funcs tfp410_con_funcs = {
107 .detect = tfp410_connector_detect,
108 .fill_modes = drm_helper_probe_single_connector_modes,
109 .destroy = drm_connector_cleanup,
110 .reset = drm_atomic_helper_connector_reset,
111 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
112 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
113};
114
115static int tfp410_attach(struct drm_bridge *bridge)
116{
117 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
118 int ret;
119
120 if (!bridge->encoder) {
121 dev_err(dvi->dev, "Missing encoder\n");
122 return -ENODEV;
123 }
124
125 if (dvi->hpd_irq >= 0)
126 dvi->connector.polled = DRM_CONNECTOR_POLL_HPD;
127 else
128 dvi->connector.polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
129
130 drm_connector_helper_add(&dvi->connector,
131 &tfp410_con_helper_funcs);
132 ret = drm_connector_init(bridge->dev, &dvi->connector,
133 &tfp410_con_funcs, dvi->connector_type);
134 if (ret) {
135 dev_err(dvi->dev, "drm_connector_init() failed: %d\n", ret);
136 return ret;
137 }
138
139 drm_display_info_set_bus_formats(&dvi->connector.display_info,
140 &dvi->bus_format, 1);
141
142 drm_connector_attach_encoder(&dvi->connector,
143 bridge->encoder);
144
145 return 0;
146}
147
148static void tfp410_enable(struct drm_bridge *bridge)
149{
150 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
151
152 gpiod_set_value_cansleep(dvi->powerdown, 0);
153}
154
155static void tfp410_disable(struct drm_bridge *bridge)
156{
157 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
158
159 gpiod_set_value_cansleep(dvi->powerdown, 1);
160}
161
162static const struct drm_bridge_funcs tfp410_bridge_funcs = {
163 .attach = tfp410_attach,
164 .enable = tfp410_enable,
165 .disable = tfp410_disable,
166};
167
168static void tfp410_hpd_work_func(struct work_struct *work)
169{
170 struct tfp410 *dvi;
171
172 dvi = container_of(work, struct tfp410, hpd_work.work);
173
174 if (dvi->bridge.dev)
175 drm_helper_hpd_irq_event(dvi->bridge.dev);
176}
177
178static irqreturn_t tfp410_hpd_irq_thread(int irq, void *arg)
179{
180 struct tfp410 *dvi = arg;
181
182 mod_delayed_work(system_wq, &dvi->hpd_work,
183 msecs_to_jiffies(HOTPLUG_DEBOUNCE_MS));
184
185 return IRQ_HANDLED;
186}
187
188static const struct drm_bridge_timings tfp410_default_timings = {
189 .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE
190 | DRM_BUS_FLAG_DE_HIGH,
191 .setup_time_ps = 1200,
192 .hold_time_ps = 1300,
193};
194
195static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c)
196{
197 struct drm_bridge_timings *timings = &dvi->timings;
198 struct device_node *ep;
199 u32 pclk_sample = 0;
200 u32 bus_width = 24;
201 s32 deskew = 0;
202
203
204 *timings = tfp410_default_timings;
205
206 if (i2c)
207
208
209
210
211
212 return 0;
213
214
215
216
217
218
219 ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 0, 0);
220 if (!ep)
221 return -EINVAL;
222
223
224 of_property_read_u32(ep, "pclk-sample", &pclk_sample);
225 of_property_read_u32(ep, "bus-width", &bus_width);
226 of_node_put(ep);
227
228 timings->input_bus_flags = DRM_BUS_FLAG_DE_HIGH;
229
230 switch (pclk_sample) {
231 case 0:
232 timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE
233 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE;
234 break;
235 case 1:
236 timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE
237 | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE;
238 break;
239 default:
240 return -EINVAL;
241 }
242
243 switch (bus_width) {
244 case 12:
245 dvi->bus_format = MEDIA_BUS_FMT_RGB888_2X12_LE;
246 break;
247 case 24:
248 dvi->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
249 break;
250 default:
251 return -EINVAL;
252 }
253
254
255 of_property_read_u32(dvi->dev->of_node, "ti,deskew", (u32 *)&deskew);
256 if (deskew < -4 || deskew > 3)
257 return -EINVAL;
258
259 timings->setup_time_ps = min(0, 1200 - 350 * deskew);
260 timings->hold_time_ps = min(0, 1300 + 350 * deskew);
261
262 return 0;
263}
264
265static int tfp410_get_connector_properties(struct tfp410 *dvi)
266{
267 struct device_node *connector_node, *ddc_phandle;
268 int ret = 0;
269
270
271 connector_node = of_graph_get_remote_node(dvi->dev->of_node, 1, -1);
272 if (!connector_node)
273 return -ENODEV;
274
275 if (of_device_is_compatible(connector_node, "hdmi-connector"))
276 dvi->connector_type = DRM_MODE_CONNECTOR_HDMIA;
277 else
278 dvi->connector_type = DRM_MODE_CONNECTOR_DVID;
279
280 dvi->hpd = fwnode_get_named_gpiod(&connector_node->fwnode,
281 "hpd-gpios", 0, GPIOD_IN, "hpd");
282 if (IS_ERR(dvi->hpd)) {
283 ret = PTR_ERR(dvi->hpd);
284 dvi->hpd = NULL;
285 if (ret == -ENOENT)
286 ret = 0;
287 else
288 goto fail;
289 }
290
291 ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0);
292 if (!ddc_phandle)
293 goto fail;
294
295 dvi->ddc = of_get_i2c_adapter_by_node(ddc_phandle);
296 if (dvi->ddc)
297 dev_info(dvi->dev, "Connector's ddc i2c bus found\n");
298 else
299 ret = -EPROBE_DEFER;
300
301 of_node_put(ddc_phandle);
302
303fail:
304 of_node_put(connector_node);
305 return ret;
306}
307
308static int tfp410_init(struct device *dev, bool i2c)
309{
310 struct tfp410 *dvi;
311 int ret;
312
313 if (!dev->of_node) {
314 dev_err(dev, "device-tree data is missing\n");
315 return -ENXIO;
316 }
317
318 dvi = devm_kzalloc(dev, sizeof(*dvi), GFP_KERNEL);
319 if (!dvi)
320 return -ENOMEM;
321 dev_set_drvdata(dev, dvi);
322
323 dvi->bridge.funcs = &tfp410_bridge_funcs;
324 dvi->bridge.of_node = dev->of_node;
325 dvi->bridge.timings = &dvi->timings;
326 dvi->dev = dev;
327
328 ret = tfp410_parse_timings(dvi, i2c);
329 if (ret)
330 goto fail;
331
332 ret = tfp410_get_connector_properties(dvi);
333 if (ret)
334 goto fail;
335
336 dvi->powerdown = devm_gpiod_get_optional(dev, "powerdown",
337 GPIOD_OUT_HIGH);
338 if (IS_ERR(dvi->powerdown)) {
339 dev_err(dev, "failed to parse powerdown gpio\n");
340 return PTR_ERR(dvi->powerdown);
341 }
342
343 if (dvi->hpd)
344 dvi->hpd_irq = gpiod_to_irq(dvi->hpd);
345 else
346 dvi->hpd_irq = -ENXIO;
347
348 if (dvi->hpd_irq >= 0) {
349 INIT_DELAYED_WORK(&dvi->hpd_work, tfp410_hpd_work_func);
350
351 ret = devm_request_threaded_irq(dev, dvi->hpd_irq,
352 NULL, tfp410_hpd_irq_thread, IRQF_TRIGGER_RISING |
353 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
354 "hdmi-hpd", dvi);
355 if (ret) {
356 DRM_ERROR("failed to register hpd interrupt\n");
357 goto fail;
358 }
359 }
360
361 drm_bridge_add(&dvi->bridge);
362
363 return 0;
364fail:
365 i2c_put_adapter(dvi->ddc);
366 if (dvi->hpd)
367 gpiod_put(dvi->hpd);
368 return ret;
369}
370
371static int tfp410_fini(struct device *dev)
372{
373 struct tfp410 *dvi = dev_get_drvdata(dev);
374
375 cancel_delayed_work_sync(&dvi->hpd_work);
376
377 drm_bridge_remove(&dvi->bridge);
378
379 if (dvi->ddc)
380 i2c_put_adapter(dvi->ddc);
381 if (dvi->hpd)
382 gpiod_put(dvi->hpd);
383
384 return 0;
385}
386
387static int tfp410_probe(struct platform_device *pdev)
388{
389 return tfp410_init(&pdev->dev, false);
390}
391
392static int tfp410_remove(struct platform_device *pdev)
393{
394 return tfp410_fini(&pdev->dev);
395}
396
397static const struct of_device_id tfp410_match[] = {
398 { .compatible = "ti,tfp410" },
399 {},
400};
401MODULE_DEVICE_TABLE(of, tfp410_match);
402
403static struct platform_driver tfp410_platform_driver = {
404 .probe = tfp410_probe,
405 .remove = tfp410_remove,
406 .driver = {
407 .name = "tfp410-bridge",
408 .of_match_table = tfp410_match,
409 },
410};
411
412#if IS_ENABLED(CONFIG_I2C)
413
414static int tfp410_i2c_probe(struct i2c_client *client,
415 const struct i2c_device_id *id)
416{
417 int reg;
418
419 if (!client->dev.of_node ||
420 of_property_read_u32(client->dev.of_node, "reg", ®)) {
421 dev_err(&client->dev,
422 "Can't get i2c reg property from device-tree\n");
423 return -ENXIO;
424 }
425
426 return tfp410_init(&client->dev, true);
427}
428
429static int tfp410_i2c_remove(struct i2c_client *client)
430{
431 return tfp410_fini(&client->dev);
432}
433
434static const struct i2c_device_id tfp410_i2c_ids[] = {
435 { "tfp410", 0 },
436 { }
437};
438MODULE_DEVICE_TABLE(i2c, tfp410_i2c_ids);
439
440static struct i2c_driver tfp410_i2c_driver = {
441 .driver = {
442 .name = "tfp410",
443 .of_match_table = of_match_ptr(tfp410_match),
444 },
445 .id_table = tfp410_i2c_ids,
446 .probe = tfp410_i2c_probe,
447 .remove = tfp410_i2c_remove,
448};
449#endif
450
451static struct {
452 uint i2c:1;
453 uint platform:1;
454} tfp410_registered_driver;
455
456static int __init tfp410_module_init(void)
457{
458 int ret;
459
460#if IS_ENABLED(CONFIG_I2C)
461 ret = i2c_add_driver(&tfp410_i2c_driver);
462 if (ret)
463 pr_err("%s: registering i2c driver failed: %d",
464 __func__, ret);
465 else
466 tfp410_registered_driver.i2c = 1;
467#endif
468
469 ret = platform_driver_register(&tfp410_platform_driver);
470 if (ret)
471 pr_err("%s: registering platform driver failed: %d",
472 __func__, ret);
473 else
474 tfp410_registered_driver.platform = 1;
475
476 if (tfp410_registered_driver.i2c ||
477 tfp410_registered_driver.platform)
478 return 0;
479
480 return ret;
481}
482module_init(tfp410_module_init);
483
484static void __exit tfp410_module_exit(void)
485{
486#if IS_ENABLED(CONFIG_I2C)
487 if (tfp410_registered_driver.i2c)
488 i2c_del_driver(&tfp410_i2c_driver);
489#endif
490 if (tfp410_registered_driver.platform)
491 platform_driver_unregister(&tfp410_platform_driver);
492}
493module_exit(tfp410_module_exit);
494
495MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
496MODULE_DESCRIPTION("TI TFP410 DVI bridge driver");
497MODULE_LICENSE("GPL");
498
