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_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 /* No EDID, fallback on the XGA standard modes */ 77 ret = drm_add_modes_noedid(connector, 1920, 1200); 78 79 /* And prefer a mode pretty much anything can handle */ 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 /* Start with defaults. */ 211 *timings = tfp410_default_timings; 212 213 if (i2c) 214 /* 215 * In I2C mode timings are configured through the I2C interface. 216 * As the driver doesn't support I2C configuration yet, we just 217 * go with the defaults (BSEL=1, DSEL=1, DKEN=0, EDGE=1). 218 */ 219 return 0; 220 221 /* 222 * In non-I2C mode, timings are configured through the BSEL, DSEL, DKEN 223 * and EDGE pins. They are specified in DT through endpoint properties 224 * and vendor-specific properties. 225 */ 226 ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 0, 0); 227 if (!ep) 228 return -EINVAL; 229 230 /* Get the sampling edge from the endpoint. */ 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 /* Get the setup and hold time from vendor-specific properties. */ 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 /* port@1 is the connector node */ 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 /* There is currently no i2c functionality. */ 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 /* IS_ENABLED(CONFIG_I2C) */ 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"); 506