This source file includes following definitions.
- drm_bridge_to_tfp410
- drm_connector_to_tfp410
- tfp410_get_modes
- tfp410_connector_detect
- tfp410_attach
- tfp410_enable
- tfp410_disable
- tfp410_hpd_work_func
- tfp410_hpd_irq_thread
- tfp410_parse_timings
- tfp410_get_connector_properties
- tfp410_init
- tfp410_fini
- tfp410_probe
- tfp410_remove
- tfp410_i2c_probe
- tfp410_i2c_remove
- tfp410_module_init
- tfp410_module_exit
1
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5
6
7 #include <linux/delay.h>
8 #include <linux/fwnode.h>
9 #include <linux/gpio/consumer.h>
10 #include <linux/i2c.h>
11 #include <linux/irq.h>
12 #include <linux/module.h>
13 #include <linux/of_graph.h>
14 #include <linux/platform_device.h>
15
16 #include <drm/drm_atomic_helper.h>
17 #include <drm/drm_crtc.h>
18 #include <drm/drm_print.h>
19 #include <drm/drm_probe_helper.h>
20
21 #define HOTPLUG_DEBOUNCE_MS 1100
22
23 struct 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
40 static inline struct tfp410 *
41 drm_bridge_to_tfp410(struct drm_bridge *bridge)
42 {
43 return container_of(bridge, struct tfp410, bridge);
44 }
45
46 static inline struct tfp410 *
47 drm_connector_to_tfp410(struct drm_connector *connector)
48 {
49 return container_of(connector, struct tfp410, connector);
50 }
51
52 static 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 ret = drm_add_edid_modes(connector, edid);
70
71 kfree(edid);
72
73 return ret;
74
75 fallback:
76
77 ret = drm_add_modes_noedid(connector, 1920, 1200);
78
79
80 drm_set_preferred_mode(connector, 1024, 768);
81
82 return ret;
83 }
84
85 static const struct drm_connector_helper_funcs tfp410_con_helper_funcs = {
86 .get_modes = tfp410_get_modes,
87 };
88
89 static enum drm_connector_status
90 tfp410_connector_detect(struct drm_connector *connector, bool force)
91 {
92 struct tfp410 *dvi = drm_connector_to_tfp410(connector);
93
94 if (dvi->hpd) {
95 if (gpiod_get_value_cansleep(dvi->hpd))
96 return connector_status_connected;
97 else
98 return connector_status_disconnected;
99 }
100
101 if (dvi->ddc) {
102 if (drm_probe_ddc(dvi->ddc))
103 return connector_status_connected;
104 else
105 return connector_status_disconnected;
106 }
107
108 return connector_status_unknown;
109 }
110
111 static const struct drm_connector_funcs tfp410_con_funcs = {
112 .detect = tfp410_connector_detect,
113 .fill_modes = drm_helper_probe_single_connector_modes,
114 .destroy = drm_connector_cleanup,
115 .reset = drm_atomic_helper_connector_reset,
116 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
117 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
118 };
119
120 static int tfp410_attach(struct drm_bridge *bridge)
121 {
122 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
123 int ret;
124
125 if (!bridge->encoder) {
126 dev_err(dvi->dev, "Missing encoder\n");
127 return -ENODEV;
128 }
129
130 if (dvi->hpd_irq >= 0)
131 dvi->connector.polled = DRM_CONNECTOR_POLL_HPD;
132 else
133 dvi->connector.polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
134
135 drm_connector_helper_add(&dvi->connector,
136 &tfp410_con_helper_funcs);
137 ret = drm_connector_init_with_ddc(bridge->dev, &dvi->connector,
138 &tfp410_con_funcs,
139 dvi->connector_type,
140 dvi->ddc);
141 if (ret) {
142 dev_err(dvi->dev, "drm_connector_init() failed: %d\n", ret);
143 return ret;
144 }
145
146 drm_display_info_set_bus_formats(&dvi->connector.display_info,
147 &dvi->bus_format, 1);
148
149 drm_connector_attach_encoder(&dvi->connector,
150 bridge->encoder);
151
152 return 0;
153 }
154
155 static void tfp410_enable(struct drm_bridge *bridge)
156 {
157 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
158
159 gpiod_set_value_cansleep(dvi->powerdown, 0);
160 }
161
162 static void tfp410_disable(struct drm_bridge *bridge)
163 {
164 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
165
166 gpiod_set_value_cansleep(dvi->powerdown, 1);
167 }
168
169 static const struct drm_bridge_funcs tfp410_bridge_funcs = {
170 .attach = tfp410_attach,
171 .enable = tfp410_enable,
172 .disable = tfp410_disable,
173 };
174
175 static void tfp410_hpd_work_func(struct work_struct *work)
176 {
177 struct tfp410 *dvi;
178
179 dvi = container_of(work, struct tfp410, hpd_work.work);
180
181 if (dvi->bridge.dev)
182 drm_helper_hpd_irq_event(dvi->bridge.dev);
183 }
184
185 static irqreturn_t tfp410_hpd_irq_thread(int irq, void *arg)
186 {
187 struct tfp410 *dvi = arg;
188
189 mod_delayed_work(system_wq, &dvi->hpd_work,
190 msecs_to_jiffies(HOTPLUG_DEBOUNCE_MS));
191
192 return IRQ_HANDLED;
193 }
194
195 static const struct drm_bridge_timings tfp410_default_timings = {
196 .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE
197 | DRM_BUS_FLAG_DE_HIGH,
198 .setup_time_ps = 1200,
199 .hold_time_ps = 1300,
200 };
201
202 static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c)
203 {
204 struct drm_bridge_timings *timings = &dvi->timings;
205 struct device_node *ep;
206 u32 pclk_sample = 0;
207 u32 bus_width = 24;
208 s32 deskew = 0;
209
210
211 *timings = tfp410_default_timings;
212
213 if (i2c)
214
215
216
217
218
219 return 0;
220
221
222
223
224
225
226 ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 0, 0);
227 if (!ep)
228 return -EINVAL;
229
230
231 of_property_read_u32(ep, "pclk-sample", &pclk_sample);
232 of_property_read_u32(ep, "bus-width", &bus_width);
233 of_node_put(ep);
234
235 timings->input_bus_flags = DRM_BUS_FLAG_DE_HIGH;
236
237 switch (pclk_sample) {
238 case 0:
239 timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE
240 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE;
241 break;
242 case 1:
243 timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE
244 | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE;
245 break;
246 default:
247 return -EINVAL;
248 }
249
250 switch (bus_width) {
251 case 12:
252 dvi->bus_format = MEDIA_BUS_FMT_RGB888_2X12_LE;
253 break;
254 case 24:
255 dvi->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
256 break;
257 default:
258 return -EINVAL;
259 }
260
261
262 of_property_read_u32(dvi->dev->of_node, "ti,deskew", (u32 *)&deskew);
263 if (deskew < -4 || deskew > 3)
264 return -EINVAL;
265
266 timings->setup_time_ps = min(0, 1200 - 350 * deskew);
267 timings->hold_time_ps = min(0, 1300 + 350 * deskew);
268
269 return 0;
270 }
271
272 static int tfp410_get_connector_properties(struct tfp410 *dvi)
273 {
274 struct device_node *connector_node, *ddc_phandle;
275 int ret = 0;
276
277
278 connector_node = of_graph_get_remote_node(dvi->dev->of_node, 1, -1);
279 if (!connector_node)
280 return -ENODEV;
281
282 if (of_device_is_compatible(connector_node, "hdmi-connector"))
283 dvi->connector_type = DRM_MODE_CONNECTOR_HDMIA;
284 else
285 dvi->connector_type = DRM_MODE_CONNECTOR_DVID;
286
287 dvi->hpd = fwnode_get_named_gpiod(&connector_node->fwnode,
288 "hpd-gpios", 0, GPIOD_IN, "hpd");
289 if (IS_ERR(dvi->hpd)) {
290 ret = PTR_ERR(dvi->hpd);
291 dvi->hpd = NULL;
292 if (ret == -ENOENT)
293 ret = 0;
294 else
295 goto fail;
296 }
297
298 ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0);
299 if (!ddc_phandle)
300 goto fail;
301
302 dvi->ddc = of_get_i2c_adapter_by_node(ddc_phandle);
303 if (dvi->ddc)
304 dev_info(dvi->dev, "Connector's ddc i2c bus found\n");
305 else
306 ret = -EPROBE_DEFER;
307
308 of_node_put(ddc_phandle);
309
310 fail:
311 of_node_put(connector_node);
312 return ret;
313 }
314
315 static int tfp410_init(struct device *dev, bool i2c)
316 {
317 struct tfp410 *dvi;
318 int ret;
319
320 if (!dev->of_node) {
321 dev_err(dev, "device-tree data is missing\n");
322 return -ENXIO;
323 }
324
325 dvi = devm_kzalloc(dev, sizeof(*dvi), GFP_KERNEL);
326 if (!dvi)
327 return -ENOMEM;
328 dev_set_drvdata(dev, dvi);
329
330 dvi->bridge.funcs = &tfp410_bridge_funcs;
331 dvi->bridge.of_node = dev->of_node;
332 dvi->bridge.timings = &dvi->timings;
333 dvi->dev = dev;
334
335 ret = tfp410_parse_timings(dvi, i2c);
336 if (ret)
337 goto fail;
338
339 ret = tfp410_get_connector_properties(dvi);
340 if (ret)
341 goto fail;
342
343 dvi->powerdown = devm_gpiod_get_optional(dev, "powerdown",
344 GPIOD_OUT_HIGH);
345 if (IS_ERR(dvi->powerdown)) {
346 dev_err(dev, "failed to parse powerdown gpio\n");
347 return PTR_ERR(dvi->powerdown);
348 }
349
350 if (dvi->hpd)
351 dvi->hpd_irq = gpiod_to_irq(dvi->hpd);
352 else
353 dvi->hpd_irq = -ENXIO;
354
355 if (dvi->hpd_irq >= 0) {
356 INIT_DELAYED_WORK(&dvi->hpd_work, tfp410_hpd_work_func);
357
358 ret = devm_request_threaded_irq(dev, dvi->hpd_irq,
359 NULL, tfp410_hpd_irq_thread, IRQF_TRIGGER_RISING |
360 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
361 "hdmi-hpd", dvi);
362 if (ret) {
363 DRM_ERROR("failed to register hpd interrupt\n");
364 goto fail;
365 }
366 }
367
368 drm_bridge_add(&dvi->bridge);
369
370 return 0;
371 fail:
372 i2c_put_adapter(dvi->ddc);
373 if (dvi->hpd)
374 gpiod_put(dvi->hpd);
375 return ret;
376 }
377
378 static int tfp410_fini(struct device *dev)
379 {
380 struct tfp410 *dvi = dev_get_drvdata(dev);
381
382 if (dvi->hpd_irq >= 0)
383 cancel_delayed_work_sync(&dvi->hpd_work);
384
385 drm_bridge_remove(&dvi->bridge);
386
387 if (dvi->ddc)
388 i2c_put_adapter(dvi->ddc);
389 if (dvi->hpd)
390 gpiod_put(dvi->hpd);
391
392 return 0;
393 }
394
395 static int tfp410_probe(struct platform_device *pdev)
396 {
397 return tfp410_init(&pdev->dev, false);
398 }
399
400 static int tfp410_remove(struct platform_device *pdev)
401 {
402 return tfp410_fini(&pdev->dev);
403 }
404
405 static const struct of_device_id tfp410_match[] = {
406 { .compatible = "ti,tfp410" },
407 {},
408 };
409 MODULE_DEVICE_TABLE(of, tfp410_match);
410
411 static struct platform_driver tfp410_platform_driver = {
412 .probe = tfp410_probe,
413 .remove = tfp410_remove,
414 .driver = {
415 .name = "tfp410-bridge",
416 .of_match_table = tfp410_match,
417 },
418 };
419
420 #if IS_ENABLED(CONFIG_I2C)
421
422 static int tfp410_i2c_probe(struct i2c_client *client,
423 const struct i2c_device_id *id)
424 {
425 int reg;
426
427 if (!client->dev.of_node ||
428 of_property_read_u32(client->dev.of_node, "reg", ®)) {
429 dev_err(&client->dev,
430 "Can't get i2c reg property from device-tree\n");
431 return -ENXIO;
432 }
433
434 return tfp410_init(&client->dev, true);
435 }
436
437 static int tfp410_i2c_remove(struct i2c_client *client)
438 {
439 return tfp410_fini(&client->dev);
440 }
441
442 static const struct i2c_device_id tfp410_i2c_ids[] = {
443 { "tfp410", 0 },
444 { }
445 };
446 MODULE_DEVICE_TABLE(i2c, tfp410_i2c_ids);
447
448 static struct i2c_driver tfp410_i2c_driver = {
449 .driver = {
450 .name = "tfp410",
451 .of_match_table = of_match_ptr(tfp410_match),
452 },
453 .id_table = tfp410_i2c_ids,
454 .probe = tfp410_i2c_probe,
455 .remove = tfp410_i2c_remove,
456 };
457 #endif
458
459 static struct {
460 uint i2c:1;
461 uint platform:1;
462 } tfp410_registered_driver;
463
464 static int __init tfp410_module_init(void)
465 {
466 int ret;
467
468 #if IS_ENABLED(CONFIG_I2C)
469 ret = i2c_add_driver(&tfp410_i2c_driver);
470 if (ret)
471 pr_err("%s: registering i2c driver failed: %d",
472 __func__, ret);
473 else
474 tfp410_registered_driver.i2c = 1;
475 #endif
476
477 ret = platform_driver_register(&tfp410_platform_driver);
478 if (ret)
479 pr_err("%s: registering platform driver failed: %d",
480 __func__, ret);
481 else
482 tfp410_registered_driver.platform = 1;
483
484 if (tfp410_registered_driver.i2c ||
485 tfp410_registered_driver.platform)
486 return 0;
487
488 return ret;
489 }
490 module_init(tfp410_module_init);
491
492 static void __exit tfp410_module_exit(void)
493 {
494 #if IS_ENABLED(CONFIG_I2C)
495 if (tfp410_registered_driver.i2c)
496 i2c_del_driver(&tfp410_i2c_driver);
497 #endif
498 if (tfp410_registered_driver.platform)
499 platform_driver_unregister(&tfp410_platform_driver);
500 }
501 module_exit(tfp410_module_exit);
502
503 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
504 MODULE_DESCRIPTION("TI TFP410 DVI bridge driver");
505 MODULE_LICENSE("GPL");