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(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 } 152 153 static 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 } 159 160 static 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 } 166 167 static const struct drm_bridge_funcs tfp410_bridge_funcs = { 168 .attach = tfp410_attach, 169 .enable = tfp410_enable, 170 .disable = tfp410_disable, 171 }; 172 173 static 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 } 182 183 static 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 } 192 193 static 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 }; 199 200 static 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 /* Start with defaults. */ 209 *timings = tfp410_default_timings; 210 211 if (i2c) 212 /* 213 * In I2C mode timings are configured through the I2C interface. 214 * As the driver doesn't support I2C configuration yet, we just 215 * go with the defaults (BSEL=1, DSEL=1, DKEN=0, EDGE=1). 216 */ 217 return 0; 218 219 /* 220 * In non-I2C mode, timings are configured through the BSEL, DSEL, DKEN 221 * and EDGE pins. They are specified in DT through endpoint properties 222 * and vendor-specific properties. 223 */ 224 ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 0, 0); 225 if (!ep) 226 return -EINVAL; 227 228 /* Get the sampling edge from the endpoint. */ 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 /* Get the setup and hold time from vendor-specific properties. */ 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 } 269 270 static int tfp410_get_connector_properties(struct tfp410 *dvi) 271 { 272 struct device_node *connector_node, *ddc_phandle; 273 int ret = 0; 274 275 /* port@1 is the connector node */ 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); 307 308 fail: 309 of_node_put(connector_node); 310 return ret; 311 } 312 313 static 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; 369 fail: 370 i2c_put_adapter(dvi->ddc); 371 if (dvi->hpd) 372 gpiod_put(dvi->hpd); 373 return ret; 374 } 375 376 static 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 } 392 393 static int tfp410_probe(struct platform_device *pdev) 394 { 395 return tfp410_init(&pdev->dev, false); 396 } 397 398 static int tfp410_remove(struct platform_device *pdev) 399 { 400 return tfp410_fini(&pdev->dev); 401 } 402 403 static const struct of_device_id tfp410_match[] = { 404 { .compatible = "ti,tfp410" }, 405 {}, 406 }; 407 MODULE_DEVICE_TABLE(of, tfp410_match); 408 409 static 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 /* There is currently no i2c functionality. */ 420 static 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 } 434 435 static int tfp410_i2c_remove(struct i2c_client *client) 436 { 437 return tfp410_fini(&client->dev); 438 } 439 440 static const struct i2c_device_id tfp410_i2c_ids[] = { 441 { "tfp410", 0 }, 442 { } 443 }; 444 MODULE_DEVICE_TABLE(i2c, tfp410_i2c_ids); 445 446 static 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 /* IS_ENABLED(CONFIG_I2C) */ 456 457 static struct { 458 uint i2c:1; 459 uint platform:1; 460 } tfp410_registered_driver; 461 462 static 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 } 488 module_init(tfp410_module_init); 489 490 static 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 } 499 module_exit(tfp410_module_exit); 500 501 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>"); 502 MODULE_DESCRIPTION("TI TFP410 DVI bridge driver"); 503 MODULE_LICENSE("GPL"); 504