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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
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 ret = drm_add_edid_modes(connector, edid);
70
71 kfree(edid);
72
73 return ret;
74
75fallback:
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
85static const struct drm_connector_helper_funcs tfp410_con_helper_funcs = {
86 .get_modes = tfp410_get_modes,
87};
88
89static enum drm_connector_status
90tfp410_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
111static 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
120static 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(bridge->dev, &dvi->connector,
138 &tfp410_con_funcs, dvi->connector_type);
139 if (ret) {
140 dev_err(dvi->dev, "drm_connector_init() failed: %d\n", ret);
141 return ret;
142 }
143
144 drm_display_info_set_bus_formats(&dvi->connector.display_info,
145 &dvi->bus_format, 1);
146
147 drm_connector_attach_encoder(&dvi->connector,
148 bridge->encoder);
149
150 return 0;
151}
152
153static void tfp410_enable(struct drm_bridge *bridge)
154{
155 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
156
157 gpiod_set_value_cansleep(dvi->powerdown, 0);
158}
159
160static void tfp410_disable(struct drm_bridge *bridge)
161{
162 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
163
164 gpiod_set_value_cansleep(dvi->powerdown, 1);
165}
166
167static const struct drm_bridge_funcs tfp410_bridge_funcs = {
168 .attach = tfp410_attach,
169 .enable = tfp410_enable,
170 .disable = tfp410_disable,
171};
172
173static void tfp410_hpd_work_func(struct work_struct *work)
174{
175 struct tfp410 *dvi;
176
177 dvi = container_of(work, struct tfp410, hpd_work.work);
178
179 if (dvi->bridge.dev)
180 drm_helper_hpd_irq_event(dvi->bridge.dev);
181}
182
183static irqreturn_t tfp410_hpd_irq_thread(int irq, void *arg)
184{
185 struct tfp410 *dvi = arg;
186
187 mod_delayed_work(system_wq, &dvi->hpd_work,
188 msecs_to_jiffies(HOTPLUG_DEBOUNCE_MS));
189
190 return IRQ_HANDLED;
191}
192
193static const struct drm_bridge_timings tfp410_default_timings = {
194 .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE
195 | DRM_BUS_FLAG_DE_HIGH,
196 .setup_time_ps = 1200,
197 .hold_time_ps = 1300,
198};
199
200static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c)
201{
202 struct drm_bridge_timings *timings = &dvi->timings;
203 struct device_node *ep;
204 u32 pclk_sample = 0;
205 u32 bus_width = 24;
206 s32 deskew = 0;
207
208
209 *timings = tfp410_default_timings;
210
211 if (i2c)
212
213
214
215
216
217 return 0;
218
219
220
221
222
223
224 ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 0, 0);
225 if (!ep)
226 return -EINVAL;
227
228
229 of_property_read_u32(ep, "pclk-sample", &pclk_sample);
230 of_property_read_u32(ep, "bus-width", &bus_width);
231 of_node_put(ep);
232
233 timings->input_bus_flags = DRM_BUS_FLAG_DE_HIGH;
234
235 switch (pclk_sample) {
236 case 0:
237 timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE
238 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE;
239 break;
240 case 1:
241 timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE
242 | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE;
243 break;
244 default:
245 return -EINVAL;
246 }
247
248 switch (bus_width) {
249 case 12:
250 dvi->bus_format = MEDIA_BUS_FMT_RGB888_2X12_LE;
251 break;
252 case 24:
253 dvi->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
254 break;
255 default:
256 return -EINVAL;
257 }
258
259
260 of_property_read_u32(dvi->dev->of_node, "ti,deskew", (u32 *)&deskew);
261 if (deskew < -4 || deskew > 3)
262 return -EINVAL;
263
264 timings->setup_time_ps = min(0, 1200 - 350 * deskew);
265 timings->hold_time_ps = min(0, 1300 + 350 * deskew);
266
267 return 0;
268}
269
270static int tfp410_get_connector_properties(struct tfp410 *dvi)
271{
272 struct device_node *connector_node, *ddc_phandle;
273 int ret = 0;
274
275
276 connector_node = of_graph_get_remote_node(dvi->dev->of_node, 1, -1);
277 if (!connector_node)
278 return -ENODEV;
279
280 if (of_device_is_compatible(connector_node, "hdmi-connector"))
281 dvi->connector_type = DRM_MODE_CONNECTOR_HDMIA;
282 else
283 dvi->connector_type = DRM_MODE_CONNECTOR_DVID;
284
285 dvi->hpd = fwnode_get_named_gpiod(&connector_node->fwnode,
286 "hpd-gpios", 0, GPIOD_IN, "hpd");
287 if (IS_ERR(dvi->hpd)) {
288 ret = PTR_ERR(dvi->hpd);
289 dvi->hpd = NULL;
290 if (ret == -ENOENT)
291 ret = 0;
292 else
293 goto fail;
294 }
295
296 ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0);
297 if (!ddc_phandle)
298 goto fail;
299
300 dvi->ddc = of_get_i2c_adapter_by_node(ddc_phandle);
301 if (dvi->ddc)
302 dev_info(dvi->dev, "Connector's ddc i2c bus found\n");
303 else
304 ret = -EPROBE_DEFER;
305
306 of_node_put(ddc_phandle);
307
308fail:
309 of_node_put(connector_node);
310 return ret;
311}
312
313static int tfp410_init(struct device *dev, bool i2c)
314{
315 struct tfp410 *dvi;
316 int ret;
317
318 if (!dev->of_node) {
319 dev_err(dev, "device-tree data is missing\n");
320 return -ENXIO;
321 }
322
323 dvi = devm_kzalloc(dev, sizeof(*dvi), GFP_KERNEL);
324 if (!dvi)
325 return -ENOMEM;
326 dev_set_drvdata(dev, dvi);
327
328 dvi->bridge.funcs = &tfp410_bridge_funcs;
329 dvi->bridge.of_node = dev->of_node;
330 dvi->bridge.timings = &dvi->timings;
331 dvi->dev = dev;
332
333 ret = tfp410_parse_timings(dvi, i2c);
334 if (ret)
335 goto fail;
336
337 ret = tfp410_get_connector_properties(dvi);
338 if (ret)
339 goto fail;
340
341 dvi->powerdown = devm_gpiod_get_optional(dev, "powerdown",
342 GPIOD_OUT_HIGH);
343 if (IS_ERR(dvi->powerdown)) {
344 dev_err(dev, "failed to parse powerdown gpio\n");
345 return PTR_ERR(dvi->powerdown);
346 }
347
348 if (dvi->hpd)
349 dvi->hpd_irq = gpiod_to_irq(dvi->hpd);
350 else
351 dvi->hpd_irq = -ENXIO;
352
353 if (dvi->hpd_irq >= 0) {
354 INIT_DELAYED_WORK(&dvi->hpd_work, tfp410_hpd_work_func);
355
356 ret = devm_request_threaded_irq(dev, dvi->hpd_irq,
357 NULL, tfp410_hpd_irq_thread, IRQF_TRIGGER_RISING |
358 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
359 "hdmi-hpd", dvi);
360 if (ret) {
361 DRM_ERROR("failed to register hpd interrupt\n");
362 goto fail;
363 }
364 }
365
366 drm_bridge_add(&dvi->bridge);
367
368 return 0;
369fail:
370 i2c_put_adapter(dvi->ddc);
371 if (dvi->hpd)
372 gpiod_put(dvi->hpd);
373 return ret;
374}
375
376static int tfp410_fini(struct device *dev)
377{
378 struct tfp410 *dvi = dev_get_drvdata(dev);
379
380 if (dvi->hpd_irq >= 0)
381 cancel_delayed_work_sync(&dvi->hpd_work);
382
383 drm_bridge_remove(&dvi->bridge);
384
385 if (dvi->ddc)
386 i2c_put_adapter(dvi->ddc);
387 if (dvi->hpd)
388 gpiod_put(dvi->hpd);
389
390 return 0;
391}
392
393static int tfp410_probe(struct platform_device *pdev)
394{
395 return tfp410_init(&pdev->dev, false);
396}
397
398static int tfp410_remove(struct platform_device *pdev)
399{
400 return tfp410_fini(&pdev->dev);
401}
402
403static const struct of_device_id tfp410_match[] = {
404 { .compatible = "ti,tfp410" },
405 {},
406};
407MODULE_DEVICE_TABLE(of, tfp410_match);
408
409static struct platform_driver tfp410_platform_driver = {
410 .probe = tfp410_probe,
411 .remove = tfp410_remove,
412 .driver = {
413 .name = "tfp410-bridge",
414 .of_match_table = tfp410_match,
415 },
416};
417
418#if IS_ENABLED(CONFIG_I2C)
419
420static int tfp410_i2c_probe(struct i2c_client *client,
421 const struct i2c_device_id *id)
422{
423 int reg;
424
425 if (!client->dev.of_node ||
426 of_property_read_u32(client->dev.of_node, "reg", ®)) {
427 dev_err(&client->dev,
428 "Can't get i2c reg property from device-tree\n");
429 return -ENXIO;
430 }
431
432 return tfp410_init(&client->dev, true);
433}
434
435static int tfp410_i2c_remove(struct i2c_client *client)
436{
437 return tfp410_fini(&client->dev);
438}
439
440static const struct i2c_device_id tfp410_i2c_ids[] = {
441 { "tfp410", 0 },
442 { }
443};
444MODULE_DEVICE_TABLE(i2c, tfp410_i2c_ids);
445
446static struct i2c_driver tfp410_i2c_driver = {
447 .driver = {
448 .name = "tfp410",
449 .of_match_table = of_match_ptr(tfp410_match),
450 },
451 .id_table = tfp410_i2c_ids,
452 .probe = tfp410_i2c_probe,
453 .remove = tfp410_i2c_remove,
454};
455#endif
456
457static struct {
458 uint i2c:1;
459 uint platform:1;
460} tfp410_registered_driver;
461
462static int __init tfp410_module_init(void)
463{
464 int ret;
465
466#if IS_ENABLED(CONFIG_I2C)
467 ret = i2c_add_driver(&tfp410_i2c_driver);
468 if (ret)
469 pr_err("%s: registering i2c driver failed: %d",
470 __func__, ret);
471 else
472 tfp410_registered_driver.i2c = 1;
473#endif
474
475 ret = platform_driver_register(&tfp410_platform_driver);
476 if (ret)
477 pr_err("%s: registering platform driver failed: %d",
478 __func__, ret);
479 else
480 tfp410_registered_driver.platform = 1;
481
482 if (tfp410_registered_driver.i2c ||
483 tfp410_registered_driver.platform)
484 return 0;
485
486 return ret;
487}
488module_init(tfp410_module_init);
489
490static void __exit tfp410_module_exit(void)
491{
492#if IS_ENABLED(CONFIG_I2C)
493 if (tfp410_registered_driver.i2c)
494 i2c_del_driver(&tfp410_i2c_driver);
495#endif
496 if (tfp410_registered_driver.platform)
497 platform_driver_unregister(&tfp410_platform_driver);
498}
499module_exit(tfp410_module_exit);
500
501MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
502MODULE_DESCRIPTION("TI TFP410 DVI bridge driver");
503MODULE_LICENSE("GPL");
504
