1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2 3 #include <drm/clients/drm_client_setup.h> 4 #include <drm/drm_atomic.h> 5 #include <drm/drm_atomic_helper.h> 6 #include <drm/drm_connector.h> 7 #include <drm/drm_damage_helper.h> 8 #include <drm/drm_drv.h> 9 #include <drm/drm_fb_dma_helper.h> 10 #include <drm/drm_fbdev_dma.h> 11 #include <drm/drm_format_helper.h> 12 #include <drm/drm_framebuffer.h> 13 #include <drm/drm_gem_atomic_helper.h> 14 #include <drm/drm_gem_dma_helper.h> 15 #include <drm/drm_gem_framebuffer_helper.h> 16 #include <drm/drm_managed.h> 17 #include <drm/drm_modes.h> 18 #include <drm/drm_probe_helper.h> 19 #include <drm/drm_rect.h> 20 #include <linux/bitrev.h> 21 #include <linux/delay.h> 22 #include <linux/gpio/consumer.h> 23 #include <linux/kthread.h> 24 #include <linux/mod_devicetable.h> 25 #include <linux/module.h> 26 #include <linux/mutex.h> 27 #include <linux/pwm.h> 28 #include <linux/spi/spi.h> 29 30 #define SHARP_MODE_PERIOD 8 31 #define SHARP_ADDR_PERIOD 8 32 #define SHARP_DUMMY_PERIOD 8 33 34 #define SHARP_MEMORY_DISPLAY_MAINTAIN_MODE 0 35 #define SHARP_MEMORY_DISPLAY_UPDATE_MODE 1 36 #define SHARP_MEMORY_DISPLAY_CLEAR_MODE 4 37 38 enum sharp_memory_model { 39 LS010B7DH04, 40 LS011B7DH03, 41 LS012B7DD01, 42 LS013B7DH03, 43 LS013B7DH05, 44 LS018B7DH02, 45 LS027B7DH01, 46 LS027B7DH01A, 47 LS032B7DD02, 48 LS044Q7DH01, 49 }; 50 51 enum sharp_memory_vcom_mode { 52 SHARP_MEMORY_SOFTWARE_VCOM, 53 SHARP_MEMORY_EXTERNAL_VCOM, 54 SHARP_MEMORY_PWM_VCOM 55 }; 56 57 struct sharp_memory_device { 58 struct drm_device drm; 59 struct spi_device *spi; 60 61 const struct drm_display_mode *mode; 62 63 struct drm_crtc crtc; 64 struct drm_plane plane; 65 struct drm_encoder encoder; 66 struct drm_connector connector; 67 68 struct gpio_desc *enable_gpio; 69 70 struct task_struct *sw_vcom_signal; 71 struct pwm_device *pwm_vcom_signal; 72 73 enum sharp_memory_vcom_mode vcom_mode; 74 u8 vcom; 75 76 u32 pitch; 77 u32 tx_buffer_size; 78 u8 *tx_buffer; 79 80 /* When vcom_mode == "software" a kthread is used to periodically send a 81 * 'maintain display' message over spi. This mutex ensures tx_buffer access 82 * and spi bus usage is synchronized in this case. 83 */ 84 struct mutex tx_mutex; 85 }; 86 87 static inline int sharp_memory_spi_write(struct spi_device *spi, void *buf, size_t len) 88 { 89 /* Reverse the bit order */ 90 for (u8 *b = buf; b < ((u8 *)buf) + len; ++b) 91 *b = bitrev8(*b); 92 93 return spi_write(spi, buf, len); 94 } 95 96 static inline struct sharp_memory_device *drm_to_sharp_memory_device(struct drm_device *drm) 97 { 98 return container_of(drm, struct sharp_memory_device, drm); 99 } 100 101 DEFINE_DRM_GEM_DMA_FOPS(sharp_memory_fops); 102 103 static const struct drm_driver sharp_memory_drm_driver = { 104 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 105 .fops = &sharp_memory_fops, 106 DRM_GEM_DMA_DRIVER_OPS_VMAP, 107 DRM_FBDEV_DMA_DRIVER_OPS, 108 .name = "sharp_memory_display", 109 .desc = "Sharp Display Memory LCD", 110 .major = 1, 111 .minor = 0, 112 }; 113 114 static inline void sharp_memory_set_tx_buffer_mode(u8 *buffer, u8 mode, u8 vcom) 115 { 116 *buffer = mode | (vcom << 1); 117 } 118 119 static inline void sharp_memory_set_tx_buffer_addresses(u8 *buffer, 120 struct drm_rect clip, 121 u32 pitch) 122 { 123 for (u32 line = 0; line < clip.y2; ++line) 124 buffer[line * pitch] = line + 1; 125 } 126 127 static void sharp_memory_set_tx_buffer_data(u8 *buffer, 128 struct drm_framebuffer *fb, 129 struct drm_rect clip, 130 u32 pitch, 131 struct drm_format_conv_state *fmtcnv_state) 132 { 133 int ret; 134 struct iosys_map dst, vmap; 135 struct drm_gem_dma_object *dma_obj = drm_fb_dma_get_gem_obj(fb, 0); 136 137 ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE); 138 if (ret) 139 return; 140 141 iosys_map_set_vaddr(&dst, buffer); 142 iosys_map_set_vaddr(&vmap, dma_obj->vaddr); 143 144 drm_fb_xrgb8888_to_mono(&dst, &pitch, &vmap, fb, &clip, fmtcnv_state); 145 146 drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE); 147 } 148 149 static int sharp_memory_update_display(struct sharp_memory_device *smd, 150 struct drm_framebuffer *fb, 151 struct drm_rect clip, 152 struct drm_format_conv_state *fmtcnv_state) 153 { 154 int ret; 155 u32 pitch = smd->pitch; 156 u8 vcom = smd->vcom; 157 u8 *tx_buffer = smd->tx_buffer; 158 u32 tx_buffer_size = smd->tx_buffer_size; 159 160 mutex_lock(&smd->tx_mutex); 161 162 /* Populate the transmit buffer with frame data */ 163 sharp_memory_set_tx_buffer_mode(&tx_buffer[0], 164 SHARP_MEMORY_DISPLAY_UPDATE_MODE, vcom); 165 sharp_memory_set_tx_buffer_addresses(&tx_buffer[1], clip, pitch); 166 sharp_memory_set_tx_buffer_data(&tx_buffer[2], fb, clip, pitch, fmtcnv_state); 167 168 ret = sharp_memory_spi_write(smd->spi, tx_buffer, tx_buffer_size); 169 170 mutex_unlock(&smd->tx_mutex); 171 172 return ret; 173 } 174 175 static int sharp_memory_maintain_display(struct sharp_memory_device *smd) 176 { 177 int ret; 178 u8 vcom = smd->vcom; 179 u8 *tx_buffer = smd->tx_buffer; 180 181 mutex_lock(&smd->tx_mutex); 182 183 sharp_memory_set_tx_buffer_mode(&tx_buffer[0], SHARP_MEMORY_DISPLAY_MAINTAIN_MODE, vcom); 184 tx_buffer[1] = 0; /* Write dummy data */ 185 ret = sharp_memory_spi_write(smd->spi, tx_buffer, 2); 186 187 mutex_unlock(&smd->tx_mutex); 188 189 return ret; 190 } 191 192 static int sharp_memory_clear_display(struct sharp_memory_device *smd) 193 { 194 int ret; 195 u8 vcom = smd->vcom; 196 u8 *tx_buffer = smd->tx_buffer; 197 198 mutex_lock(&smd->tx_mutex); 199 200 sharp_memory_set_tx_buffer_mode(&tx_buffer[0], SHARP_MEMORY_DISPLAY_CLEAR_MODE, vcom); 201 tx_buffer[1] = 0; /* write dummy data */ 202 ret = sharp_memory_spi_write(smd->spi, tx_buffer, 2); 203 204 mutex_unlock(&smd->tx_mutex); 205 206 return ret; 207 } 208 209 static void sharp_memory_fb_dirty(struct drm_framebuffer *fb, struct drm_rect *rect, 210 struct drm_format_conv_state *fmtconv_state) 211 { 212 struct drm_rect clip; 213 struct sharp_memory_device *smd = drm_to_sharp_memory_device(fb->dev); 214 215 /* Always update a full line regardless of what is dirty */ 216 clip.x1 = 0; 217 clip.x2 = fb->width; 218 clip.y1 = rect->y1; 219 clip.y2 = rect->y2; 220 221 sharp_memory_update_display(smd, fb, clip, fmtconv_state); 222 } 223 224 static int sharp_memory_plane_atomic_check(struct drm_plane *plane, 225 struct drm_atomic_state *state) 226 { 227 struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane); 228 struct sharp_memory_device *smd; 229 struct drm_crtc_state *crtc_state; 230 231 smd = container_of(plane, struct sharp_memory_device, plane); 232 crtc_state = drm_atomic_get_new_crtc_state(state, &smd->crtc); 233 234 return drm_atomic_helper_check_plane_state(plane_state, crtc_state, 235 DRM_PLANE_NO_SCALING, 236 DRM_PLANE_NO_SCALING, 237 false, false); 238 } 239 240 static void sharp_memory_plane_atomic_update(struct drm_plane *plane, 241 struct drm_atomic_state *state) 242 { 243 struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state, plane); 244 struct drm_plane_state *plane_state = plane->state; 245 struct drm_format_conv_state fmtcnv_state = DRM_FORMAT_CONV_STATE_INIT; 246 struct sharp_memory_device *smd; 247 struct drm_rect rect; 248 249 smd = container_of(plane, struct sharp_memory_device, plane); 250 if (!smd->crtc.state->active) 251 return; 252 253 if (drm_atomic_helper_damage_merged(old_state, plane_state, &rect)) 254 sharp_memory_fb_dirty(plane_state->fb, &rect, &fmtcnv_state); 255 256 drm_format_conv_state_release(&fmtcnv_state); 257 } 258 259 static const struct drm_plane_helper_funcs sharp_memory_plane_helper_funcs = { 260 .prepare_fb = drm_gem_plane_helper_prepare_fb, 261 .atomic_check = sharp_memory_plane_atomic_check, 262 .atomic_update = sharp_memory_plane_atomic_update, 263 }; 264 265 static bool sharp_memory_format_mod_supported(struct drm_plane *plane, 266 u32 format, 267 u64 modifier) 268 { 269 return modifier == DRM_FORMAT_MOD_LINEAR; 270 } 271 272 static const struct drm_plane_funcs sharp_memory_plane_funcs = { 273 .update_plane = drm_atomic_helper_update_plane, 274 .disable_plane = drm_atomic_helper_disable_plane, 275 .destroy = drm_plane_cleanup, 276 .reset = drm_atomic_helper_plane_reset, 277 .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state, 278 .atomic_destroy_state = drm_atomic_helper_plane_destroy_state, 279 .format_mod_supported = sharp_memory_format_mod_supported, 280 }; 281 282 static enum drm_mode_status sharp_memory_crtc_mode_valid(struct drm_crtc *crtc, 283 const struct drm_display_mode *mode) 284 { 285 struct sharp_memory_device *smd = drm_to_sharp_memory_device(crtc->dev); 286 287 return drm_crtc_helper_mode_valid_fixed(crtc, mode, smd->mode); 288 } 289 290 static int sharp_memory_crtc_check(struct drm_crtc *crtc, 291 struct drm_atomic_state *state) 292 { 293 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc); 294 int ret; 295 296 if (!crtc_state->enable) 297 goto out; 298 299 ret = drm_atomic_helper_check_crtc_primary_plane(crtc_state); 300 if (ret) 301 return ret; 302 303 out: 304 return drm_atomic_add_affected_planes(state, crtc); 305 } 306 307 static int sharp_memory_sw_vcom_signal_thread(void *data) 308 { 309 struct sharp_memory_device *smd = data; 310 311 while (!kthread_should_stop()) { 312 smd->vcom ^= 1; /* Toggle vcom */ 313 sharp_memory_maintain_display(smd); 314 msleep(1000); 315 } 316 317 return 0; 318 } 319 320 static void sharp_memory_crtc_enable(struct drm_crtc *crtc, 321 struct drm_atomic_state *state) 322 { 323 struct sharp_memory_device *smd = drm_to_sharp_memory_device(crtc->dev); 324 325 sharp_memory_clear_display(smd); 326 327 if (smd->enable_gpio) 328 gpiod_set_value(smd->enable_gpio, 1); 329 } 330 331 static void sharp_memory_crtc_disable(struct drm_crtc *crtc, 332 struct drm_atomic_state *state) 333 { 334 struct sharp_memory_device *smd = drm_to_sharp_memory_device(crtc->dev); 335 336 sharp_memory_clear_display(smd); 337 338 if (smd->enable_gpio) 339 gpiod_set_value(smd->enable_gpio, 0); 340 } 341 342 static const struct drm_crtc_helper_funcs sharp_memory_crtc_helper_funcs = { 343 .mode_valid = sharp_memory_crtc_mode_valid, 344 .atomic_check = sharp_memory_crtc_check, 345 .atomic_enable = sharp_memory_crtc_enable, 346 .atomic_disable = sharp_memory_crtc_disable, 347 }; 348 349 static const struct drm_crtc_funcs sharp_memory_crtc_funcs = { 350 .reset = drm_atomic_helper_crtc_reset, 351 .destroy = drm_crtc_cleanup, 352 .set_config = drm_atomic_helper_set_config, 353 .page_flip = drm_atomic_helper_page_flip, 354 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, 355 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, 356 }; 357 358 static const struct drm_encoder_funcs sharp_memory_encoder_funcs = { 359 .destroy = drm_encoder_cleanup, 360 }; 361 362 static int sharp_memory_connector_get_modes(struct drm_connector *connector) 363 { 364 struct sharp_memory_device *smd = drm_to_sharp_memory_device(connector->dev); 365 366 return drm_connector_helper_get_modes_fixed(connector, smd->mode); 367 } 368 369 static const struct drm_connector_helper_funcs sharp_memory_connector_hfuncs = { 370 .get_modes = sharp_memory_connector_get_modes, 371 }; 372 373 static const struct drm_connector_funcs sharp_memory_connector_funcs = { 374 .reset = drm_atomic_helper_connector_reset, 375 .fill_modes = drm_helper_probe_single_connector_modes, 376 .destroy = drm_connector_cleanup, 377 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 378 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 379 380 }; 381 382 static const struct drm_mode_config_funcs sharp_memory_mode_config_funcs = { 383 .fb_create = drm_gem_fb_create_with_dirty, 384 .atomic_check = drm_atomic_helper_check, 385 .atomic_commit = drm_atomic_helper_commit, 386 }; 387 388 static const struct drm_display_mode sharp_memory_ls010b7dh04_mode = { 389 DRM_SIMPLE_MODE(128, 128, 18, 18), 390 }; 391 392 static const struct drm_display_mode sharp_memory_ls011b7dh03_mode = { 393 DRM_SIMPLE_MODE(160, 68, 25, 10), 394 }; 395 396 static const struct drm_display_mode sharp_memory_ls012b7dd01_mode = { 397 DRM_SIMPLE_MODE(184, 38, 29, 6), 398 }; 399 400 static const struct drm_display_mode sharp_memory_ls013b7dh03_mode = { 401 DRM_SIMPLE_MODE(128, 128, 23, 23), 402 }; 403 404 static const struct drm_display_mode sharp_memory_ls013b7dh05_mode = { 405 DRM_SIMPLE_MODE(144, 168, 20, 24), 406 }; 407 408 static const struct drm_display_mode sharp_memory_ls018b7dh02_mode = { 409 DRM_SIMPLE_MODE(230, 303, 27, 36), 410 }; 411 412 static const struct drm_display_mode sharp_memory_ls027b7dh01_mode = { 413 DRM_SIMPLE_MODE(400, 240, 58, 35), 414 }; 415 416 static const struct drm_display_mode sharp_memory_ls032b7dd02_mode = { 417 DRM_SIMPLE_MODE(336, 536, 42, 68), 418 }; 419 420 static const struct drm_display_mode sharp_memory_ls044q7dh01_mode = { 421 DRM_SIMPLE_MODE(320, 240, 89, 67), 422 }; 423 424 static const struct spi_device_id sharp_memory_ids[] = { 425 {"ls010b7dh04", (kernel_ulong_t)&sharp_memory_ls010b7dh04_mode}, 426 {"ls011b7dh03", (kernel_ulong_t)&sharp_memory_ls011b7dh03_mode}, 427 {"ls012b7dd01", (kernel_ulong_t)&sharp_memory_ls012b7dd01_mode}, 428 {"ls013b7dh03", (kernel_ulong_t)&sharp_memory_ls013b7dh03_mode}, 429 {"ls013b7dh05", (kernel_ulong_t)&sharp_memory_ls013b7dh05_mode}, 430 {"ls018b7dh02", (kernel_ulong_t)&sharp_memory_ls018b7dh02_mode}, 431 {"ls027b7dh01", (kernel_ulong_t)&sharp_memory_ls027b7dh01_mode}, 432 {"ls027b7dh01a", (kernel_ulong_t)&sharp_memory_ls027b7dh01_mode}, 433 {"ls032b7dd02", (kernel_ulong_t)&sharp_memory_ls032b7dd02_mode}, 434 {"ls044q7dh01", (kernel_ulong_t)&sharp_memory_ls044q7dh01_mode}, 435 {}, 436 }; 437 MODULE_DEVICE_TABLE(spi, sharp_memory_ids); 438 439 static const struct of_device_id sharp_memory_of_match[] = { 440 {.compatible = "sharp,ls010b7dh04", &sharp_memory_ls010b7dh04_mode}, 441 {.compatible = "sharp,ls011b7dh03", &sharp_memory_ls011b7dh03_mode}, 442 {.compatible = "sharp,ls012b7dd01", &sharp_memory_ls012b7dd01_mode}, 443 {.compatible = "sharp,ls013b7dh03", &sharp_memory_ls013b7dh03_mode}, 444 {.compatible = "sharp,ls013b7dh05", &sharp_memory_ls013b7dh05_mode}, 445 {.compatible = "sharp,ls018b7dh02", &sharp_memory_ls018b7dh02_mode}, 446 {.compatible = "sharp,ls027b7dh01", &sharp_memory_ls027b7dh01_mode}, 447 {.compatible = "sharp,ls027b7dh01a", &sharp_memory_ls027b7dh01_mode}, 448 {.compatible = "sharp,ls032b7dd02", &sharp_memory_ls032b7dd02_mode}, 449 {.compatible = "sharp,ls044q7dh01", &sharp_memory_ls044q7dh01_mode}, 450 {}, 451 }; 452 MODULE_DEVICE_TABLE(of, sharp_memory_of_match); 453 454 static const u32 sharp_memory_formats[] = { 455 DRM_FORMAT_XRGB8888, 456 }; 457 458 static int sharp_memory_pipe_init(struct drm_device *dev, 459 struct sharp_memory_device *smd, 460 const u32 *formats, unsigned int format_count, 461 const u64 *format_modifiers) 462 { 463 int ret; 464 struct drm_encoder *encoder = &smd->encoder; 465 struct drm_plane *plane = &smd->plane; 466 struct drm_crtc *crtc = &smd->crtc; 467 struct drm_connector *connector = &smd->connector; 468 469 drm_plane_helper_add(plane, &sharp_memory_plane_helper_funcs); 470 ret = drm_universal_plane_init(dev, plane, 0, 471 &sharp_memory_plane_funcs, 472 formats, format_count, 473 format_modifiers, 474 DRM_PLANE_TYPE_PRIMARY, NULL); 475 if (ret) 476 return ret; 477 478 drm_crtc_helper_add(crtc, &sharp_memory_crtc_helper_funcs); 479 ret = drm_crtc_init_with_planes(dev, crtc, plane, NULL, 480 &sharp_memory_crtc_funcs, NULL); 481 if (ret) 482 return ret; 483 484 encoder->possible_crtcs = drm_crtc_mask(crtc); 485 ret = drm_encoder_init(dev, encoder, &sharp_memory_encoder_funcs, 486 DRM_MODE_ENCODER_NONE, NULL); 487 if (ret) 488 return ret; 489 490 ret = drm_connector_init(&smd->drm, &smd->connector, 491 &sharp_memory_connector_funcs, 492 DRM_MODE_CONNECTOR_SPI); 493 if (ret) 494 return ret; 495 496 drm_connector_helper_add(&smd->connector, 497 &sharp_memory_connector_hfuncs); 498 499 return drm_connector_attach_encoder(connector, encoder); 500 } 501 502 static int sharp_memory_init_pwm_vcom_signal(struct sharp_memory_device *smd) 503 { 504 int ret; 505 struct device *dev = &smd->spi->dev; 506 struct pwm_state pwm_state; 507 508 smd->pwm_vcom_signal = devm_pwm_get(dev, NULL); 509 if (IS_ERR(smd->pwm_vcom_signal)) 510 return dev_err_probe(dev, PTR_ERR(smd->pwm_vcom_signal), 511 "Could not get pwm device\n"); 512 513 pwm_init_state(smd->pwm_vcom_signal, &pwm_state); 514 pwm_set_relative_duty_cycle(&pwm_state, 1, 10); 515 pwm_state.enabled = true; 516 ret = pwm_apply_might_sleep(smd->pwm_vcom_signal, &pwm_state); 517 if (ret) 518 return dev_err_probe(dev, -EINVAL, "Could not apply pwm state\n"); 519 520 return 0; 521 } 522 523 static int sharp_memory_probe(struct spi_device *spi) 524 { 525 int ret; 526 struct device *dev; 527 struct sharp_memory_device *smd; 528 struct drm_device *drm; 529 const char *vcom_mode_str; 530 531 dev = &spi->dev; 532 533 ret = spi_setup(spi); 534 if (ret < 0) 535 return dev_err_probe(dev, ret, "Failed to setup spi device\n"); 536 537 if (!dev->coherent_dma_mask) { 538 ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32)); 539 if (ret) 540 return dev_err_probe(dev, ret, "Failed to set dma mask\n"); 541 } 542 543 smd = devm_drm_dev_alloc(dev, &sharp_memory_drm_driver, 544 struct sharp_memory_device, drm); 545 if (!smd) 546 return -ENOMEM; 547 548 spi_set_drvdata(spi, smd); 549 550 smd->spi = spi; 551 drm = &smd->drm; 552 ret = drmm_mode_config_init(drm); 553 if (ret) 554 return dev_err_probe(dev, ret, "Failed to initialize drm config\n"); 555 556 smd->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH); 557 if (!smd->enable_gpio) 558 dev_warn(dev, "Enable gpio not defined\n"); 559 560 drm->mode_config.funcs = &sharp_memory_mode_config_funcs; 561 smd->mode = spi_get_device_match_data(spi); 562 563 smd->pitch = (SHARP_ADDR_PERIOD + smd->mode->hdisplay + SHARP_DUMMY_PERIOD) / 8; 564 smd->tx_buffer_size = (SHARP_MODE_PERIOD + 565 (SHARP_ADDR_PERIOD + (smd->mode->hdisplay) + SHARP_DUMMY_PERIOD) * 566 smd->mode->vdisplay) / 8; 567 568 smd->tx_buffer = devm_kzalloc(dev, smd->tx_buffer_size, GFP_KERNEL); 569 if (!smd->tx_buffer) 570 return -ENOMEM; 571 572 mutex_init(&smd->tx_mutex); 573 574 /* 575 * VCOM is a signal that prevents DC bias from being built up in 576 * the panel resulting in pixels being forever stuck in one state. 577 * 578 * This driver supports three different methods to generate this 579 * signal depending on EXTMODE pin: 580 * 581 * software (EXTMODE = L) - This mode uses a kthread to 582 * periodically send a "maintain display" message to the display, 583 * toggling the vcom bit on and off with each message 584 * 585 * external (EXTMODE = H) - This mode relies on an external 586 * clock to generate the signal on the EXTCOMM pin 587 * 588 * pwm (EXTMODE = H) - This mode uses a pwm device to generate 589 * the signal on the EXTCOMM pin 590 * 591 */ 592 if (device_property_read_string(dev, "sharp,vcom-mode", &vcom_mode_str)) 593 return dev_err_probe(dev, -EINVAL, 594 "Unable to find sharp,vcom-mode node in device tree\n"); 595 596 if (!strcmp("software", vcom_mode_str)) { 597 smd->vcom_mode = SHARP_MEMORY_SOFTWARE_VCOM; 598 smd->sw_vcom_signal = kthread_run(sharp_memory_sw_vcom_signal_thread, 599 smd, "sw_vcom_signal"); 600 601 } else if (!strcmp("external", vcom_mode_str)) { 602 smd->vcom_mode = SHARP_MEMORY_EXTERNAL_VCOM; 603 604 } else if (!strcmp("pwm", vcom_mode_str)) { 605 smd->vcom_mode = SHARP_MEMORY_PWM_VCOM; 606 ret = sharp_memory_init_pwm_vcom_signal(smd); 607 if (ret) 608 return ret; 609 } else { 610 return dev_err_probe(dev, -EINVAL, "Invalid value set for vcom-mode\n"); 611 } 612 613 drm->mode_config.min_width = smd->mode->hdisplay; 614 drm->mode_config.max_width = smd->mode->hdisplay; 615 drm->mode_config.min_height = smd->mode->vdisplay; 616 drm->mode_config.max_height = smd->mode->vdisplay; 617 618 ret = sharp_memory_pipe_init(drm, smd, sharp_memory_formats, 619 ARRAY_SIZE(sharp_memory_formats), 620 NULL); 621 if (ret) 622 return dev_err_probe(dev, ret, "Failed to initialize display pipeline.\n"); 623 624 drm_plane_enable_fb_damage_clips(&smd->plane); 625 drm_mode_config_reset(drm); 626 627 ret = drm_dev_register(drm, 0); 628 if (ret) 629 return dev_err_probe(dev, ret, "Failed to register drm device.\n"); 630 631 drm_client_setup(drm, NULL); 632 633 return 0; 634 } 635 636 static void sharp_memory_remove(struct spi_device *spi) 637 { 638 struct sharp_memory_device *smd = spi_get_drvdata(spi); 639 640 drm_dev_unplug(&smd->drm); 641 drm_atomic_helper_shutdown(&smd->drm); 642 643 switch (smd->vcom_mode) { 644 case SHARP_MEMORY_SOFTWARE_VCOM: 645 kthread_stop(smd->sw_vcom_signal); 646 break; 647 648 case SHARP_MEMORY_EXTERNAL_VCOM: 649 break; 650 651 case SHARP_MEMORY_PWM_VCOM: 652 pwm_disable(smd->pwm_vcom_signal); 653 break; 654 } 655 } 656 657 static struct spi_driver sharp_memory_spi_driver = { 658 .driver = { 659 .name = "sharp_memory", 660 .of_match_table = sharp_memory_of_match, 661 }, 662 .probe = sharp_memory_probe, 663 .remove = sharp_memory_remove, 664 .id_table = sharp_memory_ids, 665 }; 666 module_spi_driver(sharp_memory_spi_driver); 667 668 MODULE_AUTHOR("Alex Lanzano <lanzano.alex@gmail.com>"); 669 MODULE_DESCRIPTION("SPI Protocol driver for the sharp_memory display"); 670 MODULE_LICENSE("GPL"); 671