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