1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2016 Texas Instruments 4 * Author: Jyri Sarha <jsarha@ti.com> 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_bridge.h> 18 #include <drm/drm_crtc.h> 19 #include <drm/drm_print.h> 20 #include <drm/drm_probe_helper.h> 21 22 #define HOTPLUG_DEBOUNCE_MS 1100 23 24 struct tfp410 { 25 struct drm_bridge bridge; 26 struct drm_connector connector; 27 unsigned int connector_type; 28 29 u32 bus_format; 30 struct i2c_adapter *ddc; 31 struct gpio_desc *hpd; 32 int hpd_irq; 33 struct delayed_work hpd_work; 34 struct gpio_desc *powerdown; 35 36 struct drm_bridge_timings timings; 37 38 struct device *dev; 39 }; 40 41 static inline struct tfp410 * 42 drm_bridge_to_tfp410(struct drm_bridge *bridge) 43 { 44 return container_of(bridge, struct tfp410, bridge); 45 } 46 47 static inline struct tfp410 * 48 drm_connector_to_tfp410(struct drm_connector *connector) 49 { 50 return container_of(connector, struct tfp410, connector); 51 } 52 53 static int tfp410_get_modes(struct drm_connector *connector) 54 { 55 struct tfp410 *dvi = drm_connector_to_tfp410(connector); 56 struct edid *edid; 57 int ret; 58 59 if (!dvi->ddc) 60 goto fallback; 61 62 edid = drm_get_edid(connector, dvi->ddc); 63 if (!edid) { 64 DRM_INFO("EDID read failed. Fallback to standard modes\n"); 65 goto fallback; 66 } 67 68 drm_connector_update_edid_property(connector, edid); 69 70 ret = drm_add_edid_modes(connector, edid); 71 72 kfree(edid); 73 74 return ret; 75 76 fallback: 77 /* No EDID, fallback on the XGA standard modes */ 78 ret = drm_add_modes_noedid(connector, 1920, 1200); 79 80 /* And prefer a mode pretty much anything can handle */ 81 drm_set_preferred_mode(connector, 1024, 768); 82 83 return ret; 84 } 85 86 static const struct drm_connector_helper_funcs tfp410_con_helper_funcs = { 87 .get_modes = tfp410_get_modes, 88 }; 89 90 static enum drm_connector_status 91 tfp410_connector_detect(struct drm_connector *connector, bool force) 92 { 93 struct tfp410 *dvi = drm_connector_to_tfp410(connector); 94 95 if (dvi->hpd) { 96 if (gpiod_get_value_cansleep(dvi->hpd)) 97 return connector_status_connected; 98 else 99 return connector_status_disconnected; 100 } 101 102 if (dvi->ddc) { 103 if (drm_probe_ddc(dvi->ddc)) 104 return connector_status_connected; 105 else 106 return connector_status_disconnected; 107 } 108 109 return connector_status_unknown; 110 } 111 112 static const struct drm_connector_funcs tfp410_con_funcs = { 113 .detect = tfp410_connector_detect, 114 .fill_modes = drm_helper_probe_single_connector_modes, 115 .destroy = drm_connector_cleanup, 116 .reset = drm_atomic_helper_connector_reset, 117 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 118 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 119 }; 120 121 static int tfp410_attach(struct drm_bridge *bridge) 122 { 123 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge); 124 int ret; 125 126 if (!bridge->encoder) { 127 dev_err(dvi->dev, "Missing encoder\n"); 128 return -ENODEV; 129 } 130 131 if (dvi->hpd_irq >= 0) 132 dvi->connector.polled = DRM_CONNECTOR_POLL_HPD; 133 else 134 dvi->connector.polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT; 135 136 drm_connector_helper_add(&dvi->connector, 137 &tfp410_con_helper_funcs); 138 ret = drm_connector_init_with_ddc(bridge->dev, &dvi->connector, 139 &tfp410_con_funcs, 140 dvi->connector_type, 141 dvi->ddc); 142 if (ret) { 143 dev_err(dvi->dev, "drm_connector_init() failed: %d\n", ret); 144 return ret; 145 } 146 147 drm_display_info_set_bus_formats(&dvi->connector.display_info, 148 &dvi->bus_format, 1); 149 150 drm_connector_attach_encoder(&dvi->connector, 151 bridge->encoder); 152 153 return 0; 154 } 155 156 static void tfp410_enable(struct drm_bridge *bridge) 157 { 158 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge); 159 160 gpiod_set_value_cansleep(dvi->powerdown, 0); 161 } 162 163 static void tfp410_disable(struct drm_bridge *bridge) 164 { 165 struct tfp410 *dvi = drm_bridge_to_tfp410(bridge); 166 167 gpiod_set_value_cansleep(dvi->powerdown, 1); 168 } 169 170 static const struct drm_bridge_funcs tfp410_bridge_funcs = { 171 .attach = tfp410_attach, 172 .enable = tfp410_enable, 173 .disable = tfp410_disable, 174 }; 175 176 static void tfp410_hpd_work_func(struct work_struct *work) 177 { 178 struct tfp410 *dvi; 179 180 dvi = container_of(work, struct tfp410, hpd_work.work); 181 182 if (dvi->bridge.dev) 183 drm_helper_hpd_irq_event(dvi->bridge.dev); 184 } 185 186 static irqreturn_t tfp410_hpd_irq_thread(int irq, void *arg) 187 { 188 struct tfp410 *dvi = arg; 189 190 mod_delayed_work(system_wq, &dvi->hpd_work, 191 msecs_to_jiffies(HOTPLUG_DEBOUNCE_MS)); 192 193 return IRQ_HANDLED; 194 } 195 196 static const struct drm_bridge_timings tfp410_default_timings = { 197 .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE 198 | DRM_BUS_FLAG_DE_HIGH, 199 .setup_time_ps = 1200, 200 .hold_time_ps = 1300, 201 }; 202 203 static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c) 204 { 205 struct drm_bridge_timings *timings = &dvi->timings; 206 struct device_node *ep; 207 u32 pclk_sample = 0; 208 u32 bus_width = 24; 209 s32 deskew = 0; 210 211 /* Start with defaults. */ 212 *timings = tfp410_default_timings; 213 214 if (i2c) 215 /* 216 * In I2C mode timings are configured through the I2C interface. 217 * As the driver doesn't support I2C configuration yet, we just 218 * go with the defaults (BSEL=1, DSEL=1, DKEN=0, EDGE=1). 219 */ 220 return 0; 221 222 /* 223 * In non-I2C mode, timings are configured through the BSEL, DSEL, DKEN 224 * and EDGE pins. They are specified in DT through endpoint properties 225 * and vendor-specific properties. 226 */ 227 ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 0, 0); 228 if (!ep) 229 return -EINVAL; 230 231 /* Get the sampling edge from the endpoint. */ 232 of_property_read_u32(ep, "pclk-sample", &pclk_sample); 233 of_property_read_u32(ep, "bus-width", &bus_width); 234 of_node_put(ep); 235 236 timings->input_bus_flags = DRM_BUS_FLAG_DE_HIGH; 237 238 switch (pclk_sample) { 239 case 0: 240 timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE 241 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE; 242 break; 243 case 1: 244 timings->input_bus_flags |= DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE 245 | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE; 246 break; 247 default: 248 return -EINVAL; 249 } 250 251 switch (bus_width) { 252 case 12: 253 dvi->bus_format = MEDIA_BUS_FMT_RGB888_2X12_LE; 254 break; 255 case 24: 256 dvi->bus_format = MEDIA_BUS_FMT_RGB888_1X24; 257 break; 258 default: 259 return -EINVAL; 260 } 261 262 /* Get the setup and hold time from vendor-specific properties. */ 263 of_property_read_u32(dvi->dev->of_node, "ti,deskew", (u32 *)&deskew); 264 if (deskew < -4 || deskew > 3) 265 return -EINVAL; 266 267 timings->setup_time_ps = min(0, 1200 - 350 * deskew); 268 timings->hold_time_ps = min(0, 1300 + 350 * deskew); 269 270 return 0; 271 } 272 273 static int tfp410_get_connector_properties(struct tfp410 *dvi) 274 { 275 struct device_node *connector_node, *ddc_phandle; 276 int ret = 0; 277 278 /* port@1 is the connector node */ 279 connector_node = of_graph_get_remote_node(dvi->dev->of_node, 1, -1); 280 if (!connector_node) 281 return -ENODEV; 282 283 if (of_device_is_compatible(connector_node, "hdmi-connector")) 284 dvi->connector_type = DRM_MODE_CONNECTOR_HDMIA; 285 else 286 dvi->connector_type = DRM_MODE_CONNECTOR_DVID; 287 288 dvi->hpd = fwnode_gpiod_get_index(&connector_node->fwnode, 289 "hpd", 0, GPIOD_IN, "hpd"); 290 if (IS_ERR(dvi->hpd)) { 291 ret = PTR_ERR(dvi->hpd); 292 dvi->hpd = NULL; 293 if (ret == -ENOENT) 294 ret = 0; 295 else 296 goto fail; 297 } 298 299 ddc_phandle = of_parse_phandle(connector_node, "ddc-i2c-bus", 0); 300 if (!ddc_phandle) 301 goto fail; 302 303 dvi->ddc = of_get_i2c_adapter_by_node(ddc_phandle); 304 if (dvi->ddc) 305 dev_info(dvi->dev, "Connector's ddc i2c bus found\n"); 306 else 307 ret = -EPROBE_DEFER; 308 309 of_node_put(ddc_phandle); 310 311 fail: 312 of_node_put(connector_node); 313 return ret; 314 } 315 316 static int tfp410_init(struct device *dev, bool i2c) 317 { 318 struct tfp410 *dvi; 319 int ret; 320 321 if (!dev->of_node) { 322 dev_err(dev, "device-tree data is missing\n"); 323 return -ENXIO; 324 } 325 326 dvi = devm_kzalloc(dev, sizeof(*dvi), GFP_KERNEL); 327 if (!dvi) 328 return -ENOMEM; 329 dev_set_drvdata(dev, dvi); 330 331 dvi->bridge.funcs = &tfp410_bridge_funcs; 332 dvi->bridge.of_node = dev->of_node; 333 dvi->bridge.timings = &dvi->timings; 334 dvi->dev = dev; 335 336 ret = tfp410_parse_timings(dvi, i2c); 337 if (ret) 338 goto fail; 339 340 ret = tfp410_get_connector_properties(dvi); 341 if (ret) 342 goto fail; 343 344 dvi->powerdown = devm_gpiod_get_optional(dev, "powerdown", 345 GPIOD_OUT_HIGH); 346 if (IS_ERR(dvi->powerdown)) { 347 dev_err(dev, "failed to parse powerdown gpio\n"); 348 return PTR_ERR(dvi->powerdown); 349 } 350 351 if (dvi->hpd) 352 dvi->hpd_irq = gpiod_to_irq(dvi->hpd); 353 else 354 dvi->hpd_irq = -ENXIO; 355 356 if (dvi->hpd_irq >= 0) { 357 INIT_DELAYED_WORK(&dvi->hpd_work, tfp410_hpd_work_func); 358 359 ret = devm_request_threaded_irq(dev, dvi->hpd_irq, 360 NULL, tfp410_hpd_irq_thread, IRQF_TRIGGER_RISING | 361 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 362 "hdmi-hpd", dvi); 363 if (ret) { 364 DRM_ERROR("failed to register hpd interrupt\n"); 365 goto fail; 366 } 367 } 368 369 drm_bridge_add(&dvi->bridge); 370 371 return 0; 372 fail: 373 i2c_put_adapter(dvi->ddc); 374 if (dvi->hpd) 375 gpiod_put(dvi->hpd); 376 return ret; 377 } 378 379 static int tfp410_fini(struct device *dev) 380 { 381 struct tfp410 *dvi = dev_get_drvdata(dev); 382 383 if (dvi->hpd_irq >= 0) 384 cancel_delayed_work_sync(&dvi->hpd_work); 385 386 drm_bridge_remove(&dvi->bridge); 387 388 if (dvi->ddc) 389 i2c_put_adapter(dvi->ddc); 390 if (dvi->hpd) 391 gpiod_put(dvi->hpd); 392 393 return 0; 394 } 395 396 static int tfp410_probe(struct platform_device *pdev) 397 { 398 return tfp410_init(&pdev->dev, false); 399 } 400 401 static int tfp410_remove(struct platform_device *pdev) 402 { 403 return tfp410_fini(&pdev->dev); 404 } 405 406 static const struct of_device_id tfp410_match[] = { 407 { .compatible = "ti,tfp410" }, 408 {}, 409 }; 410 MODULE_DEVICE_TABLE(of, tfp410_match); 411 412 static struct platform_driver tfp410_platform_driver = { 413 .probe = tfp410_probe, 414 .remove = tfp410_remove, 415 .driver = { 416 .name = "tfp410-bridge", 417 .of_match_table = tfp410_match, 418 }, 419 }; 420 421 #if IS_ENABLED(CONFIG_I2C) 422 /* There is currently no i2c functionality. */ 423 static int tfp410_i2c_probe(struct i2c_client *client, 424 const struct i2c_device_id *id) 425 { 426 int reg; 427 428 if (!client->dev.of_node || 429 of_property_read_u32(client->dev.of_node, "reg", ®)) { 430 dev_err(&client->dev, 431 "Can't get i2c reg property from device-tree\n"); 432 return -ENXIO; 433 } 434 435 return tfp410_init(&client->dev, true); 436 } 437 438 static int tfp410_i2c_remove(struct i2c_client *client) 439 { 440 return tfp410_fini(&client->dev); 441 } 442 443 static const struct i2c_device_id tfp410_i2c_ids[] = { 444 { "tfp410", 0 }, 445 { } 446 }; 447 MODULE_DEVICE_TABLE(i2c, tfp410_i2c_ids); 448 449 static struct i2c_driver tfp410_i2c_driver = { 450 .driver = { 451 .name = "tfp410", 452 .of_match_table = of_match_ptr(tfp410_match), 453 }, 454 .id_table = tfp410_i2c_ids, 455 .probe = tfp410_i2c_probe, 456 .remove = tfp410_i2c_remove, 457 }; 458 #endif /* IS_ENABLED(CONFIG_I2C) */ 459 460 static struct { 461 uint i2c:1; 462 uint platform:1; 463 } tfp410_registered_driver; 464 465 static int __init tfp410_module_init(void) 466 { 467 int ret; 468 469 #if IS_ENABLED(CONFIG_I2C) 470 ret = i2c_add_driver(&tfp410_i2c_driver); 471 if (ret) 472 pr_err("%s: registering i2c driver failed: %d", 473 __func__, ret); 474 else 475 tfp410_registered_driver.i2c = 1; 476 #endif 477 478 ret = platform_driver_register(&tfp410_platform_driver); 479 if (ret) 480 pr_err("%s: registering platform driver failed: %d", 481 __func__, ret); 482 else 483 tfp410_registered_driver.platform = 1; 484 485 if (tfp410_registered_driver.i2c || 486 tfp410_registered_driver.platform) 487 return 0; 488 489 return ret; 490 } 491 module_init(tfp410_module_init); 492 493 static void __exit tfp410_module_exit(void) 494 { 495 #if IS_ENABLED(CONFIG_I2C) 496 if (tfp410_registered_driver.i2c) 497 i2c_del_driver(&tfp410_i2c_driver); 498 #endif 499 if (tfp410_registered_driver.platform) 500 platform_driver_unregister(&tfp410_platform_driver); 501 } 502 module_exit(tfp410_module_exit); 503 504 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>"); 505 MODULE_DESCRIPTION("TI TFP410 DVI bridge driver"); 506 MODULE_LICENSE("GPL"); 507