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 const struct iosys_map *vmap, 130 struct drm_rect clip, 131 u32 pitch, 132 struct drm_format_conv_state *fmtcnv_state) 133 { 134 int ret; 135 struct iosys_map dst; 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); 142 143 drm_fb_xrgb8888_to_mono(&dst, &pitch, vmap, fb, &clip, fmtcnv_state); 144 145 drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE); 146 } 147 148 static int sharp_memory_update_display(struct sharp_memory_device *smd, 149 struct drm_framebuffer *fb, 150 const struct iosys_map *vmap, 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, vmap, 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, const struct iosys_map *vmap, 210 struct drm_rect *rect, 211 struct drm_format_conv_state *fmtconv_state) 212 { 213 struct drm_rect clip; 214 struct sharp_memory_device *smd = drm_to_sharp_memory_device(fb->dev); 215 216 /* Always update a full line regardless of what is dirty */ 217 clip.x1 = 0; 218 clip.x2 = fb->width; 219 clip.y1 = rect->y1; 220 clip.y2 = rect->y2; 221 222 sharp_memory_update_display(smd, fb, vmap, clip, fmtconv_state); 223 } 224 225 static int sharp_memory_plane_atomic_check(struct drm_plane *plane, 226 struct drm_atomic_state *state) 227 { 228 struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane); 229 struct sharp_memory_device *smd; 230 struct drm_crtc_state *crtc_state; 231 232 smd = container_of(plane, struct sharp_memory_device, plane); 233 crtc_state = drm_atomic_get_new_crtc_state(state, &smd->crtc); 234 235 return drm_atomic_helper_check_plane_state(plane_state, crtc_state, 236 DRM_PLANE_NO_SCALING, 237 DRM_PLANE_NO_SCALING, 238 false, false); 239 } 240 241 static void sharp_memory_plane_atomic_update(struct drm_plane *plane, 242 struct drm_atomic_state *state) 243 { 244 struct drm_plane_state *old_state = drm_atomic_get_old_plane_state(state, plane); 245 struct drm_plane_state *plane_state = plane->state; 246 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state); 247 struct sharp_memory_device *smd; 248 struct drm_rect rect; 249 250 smd = container_of(plane, struct sharp_memory_device, plane); 251 if (!smd->crtc.state->active) 252 return; 253 254 if (drm_atomic_helper_damage_merged(old_state, plane_state, &rect)) 255 sharp_memory_fb_dirty(plane_state->fb, shadow_plane_state->data, 256 &rect, &shadow_plane_state->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 DRM_GEM_SHADOW_PLANE_HELPER_FUNCS, 264 }; 265 266 static bool sharp_memory_format_mod_supported(struct drm_plane *plane, 267 u32 format, 268 u64 modifier) 269 { 270 return modifier == DRM_FORMAT_MOD_LINEAR; 271 } 272 273 static const struct drm_plane_funcs sharp_memory_plane_funcs = { 274 .update_plane = drm_atomic_helper_update_plane, 275 .disable_plane = drm_atomic_helper_disable_plane, 276 .destroy = drm_plane_cleanup, 277 DRM_GEM_SHADOW_PLANE_FUNCS, 278 .format_mod_supported = sharp_memory_format_mod_supported, 279 }; 280 281 static enum drm_mode_status sharp_memory_crtc_mode_valid(struct drm_crtc *crtc, 282 const struct drm_display_mode *mode) 283 { 284 struct sharp_memory_device *smd = drm_to_sharp_memory_device(crtc->dev); 285 286 return drm_crtc_helper_mode_valid_fixed(crtc, mode, smd->mode); 287 } 288 289 static int sharp_memory_crtc_check(struct drm_crtc *crtc, 290 struct drm_atomic_state *state) 291 { 292 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc); 293 int ret; 294 295 if (!crtc_state->enable) 296 goto out; 297 298 ret = drm_atomic_helper_check_crtc_primary_plane(crtc_state); 299 if (ret) 300 return ret; 301 302 out: 303 return drm_atomic_add_affected_planes(state, crtc); 304 } 305 306 static int sharp_memory_sw_vcom_signal_thread(void *data) 307 { 308 struct sharp_memory_device *smd = data; 309 310 while (!kthread_should_stop()) { 311 smd->vcom ^= 1; /* Toggle vcom */ 312 sharp_memory_maintain_display(smd); 313 msleep(1000); 314 } 315 316 return 0; 317 } 318 319 static void sharp_memory_crtc_enable(struct drm_crtc *crtc, 320 struct drm_atomic_state *state) 321 { 322 struct sharp_memory_device *smd = drm_to_sharp_memory_device(crtc->dev); 323 324 sharp_memory_clear_display(smd); 325 326 if (smd->enable_gpio) 327 gpiod_set_value(smd->enable_gpio, 1); 328 } 329 330 static void sharp_memory_crtc_disable(struct drm_crtc *crtc, 331 struct drm_atomic_state *state) 332 { 333 struct sharp_memory_device *smd = drm_to_sharp_memory_device(crtc->dev); 334 335 sharp_memory_clear_display(smd); 336 337 if (smd->enable_gpio) 338 gpiod_set_value(smd->enable_gpio, 0); 339 } 340 341 static const struct drm_crtc_helper_funcs sharp_memory_crtc_helper_funcs = { 342 .mode_valid = sharp_memory_crtc_mode_valid, 343 .atomic_check = sharp_memory_crtc_check, 344 .atomic_enable = sharp_memory_crtc_enable, 345 .atomic_disable = sharp_memory_crtc_disable, 346 }; 347 348 static const struct drm_crtc_funcs sharp_memory_crtc_funcs = { 349 .reset = drm_atomic_helper_crtc_reset, 350 .destroy = drm_crtc_cleanup, 351 .set_config = drm_atomic_helper_set_config, 352 .page_flip = drm_atomic_helper_page_flip, 353 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state, 354 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state, 355 }; 356 357 static const struct drm_encoder_funcs sharp_memory_encoder_funcs = { 358 .destroy = drm_encoder_cleanup, 359 }; 360 361 static int sharp_memory_connector_get_modes(struct drm_connector *connector) 362 { 363 struct sharp_memory_device *smd = drm_to_sharp_memory_device(connector->dev); 364 365 return drm_connector_helper_get_modes_fixed(connector, smd->mode); 366 } 367 368 static const struct drm_connector_helper_funcs sharp_memory_connector_hfuncs = { 369 .get_modes = sharp_memory_connector_get_modes, 370 }; 371 372 static const struct drm_connector_funcs sharp_memory_connector_funcs = { 373 .reset = drm_atomic_helper_connector_reset, 374 .fill_modes = drm_helper_probe_single_connector_modes, 375 .destroy = drm_connector_cleanup, 376 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 377 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 378 379 }; 380 381 static const struct drm_mode_config_funcs sharp_memory_mode_config_funcs = { 382 .fb_create = drm_gem_fb_create_with_dirty, 383 .atomic_check = drm_atomic_helper_check, 384 .atomic_commit = drm_atomic_helper_commit, 385 }; 386 387 static const struct drm_display_mode sharp_memory_ls010b7dh04_mode = { 388 DRM_SIMPLE_MODE(128, 128, 18, 18), 389 }; 390 391 static const struct drm_display_mode sharp_memory_ls011b7dh03_mode = { 392 DRM_SIMPLE_MODE(160, 68, 25, 10), 393 }; 394 395 static const struct drm_display_mode sharp_memory_ls012b7dd01_mode = { 396 DRM_SIMPLE_MODE(184, 38, 29, 6), 397 }; 398 399 static const struct drm_display_mode sharp_memory_ls013b7dh03_mode = { 400 DRM_SIMPLE_MODE(128, 128, 23, 23), 401 }; 402 403 static const struct drm_display_mode sharp_memory_ls013b7dh05_mode = { 404 DRM_SIMPLE_MODE(144, 168, 20, 24), 405 }; 406 407 static const struct drm_display_mode sharp_memory_ls018b7dh02_mode = { 408 DRM_SIMPLE_MODE(230, 303, 27, 36), 409 }; 410 411 static const struct drm_display_mode sharp_memory_ls027b7dh01_mode = { 412 DRM_SIMPLE_MODE(400, 240, 58, 35), 413 }; 414 415 static const struct drm_display_mode sharp_memory_ls032b7dd02_mode = { 416 DRM_SIMPLE_MODE(336, 536, 42, 68), 417 }; 418 419 static const struct drm_display_mode sharp_memory_ls044q7dh01_mode = { 420 DRM_SIMPLE_MODE(320, 240, 89, 67), 421 }; 422 423 static const struct spi_device_id sharp_memory_ids[] = { 424 {"ls010b7dh04", (kernel_ulong_t)&sharp_memory_ls010b7dh04_mode}, 425 {"ls011b7dh03", (kernel_ulong_t)&sharp_memory_ls011b7dh03_mode}, 426 {"ls012b7dd01", (kernel_ulong_t)&sharp_memory_ls012b7dd01_mode}, 427 {"ls013b7dh03", (kernel_ulong_t)&sharp_memory_ls013b7dh03_mode}, 428 {"ls013b7dh05", (kernel_ulong_t)&sharp_memory_ls013b7dh05_mode}, 429 {"ls018b7dh02", (kernel_ulong_t)&sharp_memory_ls018b7dh02_mode}, 430 {"ls027b7dh01", (kernel_ulong_t)&sharp_memory_ls027b7dh01_mode}, 431 {"ls027b7dh01a", (kernel_ulong_t)&sharp_memory_ls027b7dh01_mode}, 432 {"ls032b7dd02", (kernel_ulong_t)&sharp_memory_ls032b7dd02_mode}, 433 {"ls044q7dh01", (kernel_ulong_t)&sharp_memory_ls044q7dh01_mode}, 434 {}, 435 }; 436 MODULE_DEVICE_TABLE(spi, sharp_memory_ids); 437 438 static const struct of_device_id sharp_memory_of_match[] = { 439 {.compatible = "sharp,ls010b7dh04", &sharp_memory_ls010b7dh04_mode}, 440 {.compatible = "sharp,ls011b7dh03", &sharp_memory_ls011b7dh03_mode}, 441 {.compatible = "sharp,ls012b7dd01", &sharp_memory_ls012b7dd01_mode}, 442 {.compatible = "sharp,ls013b7dh03", &sharp_memory_ls013b7dh03_mode}, 443 {.compatible = "sharp,ls013b7dh05", &sharp_memory_ls013b7dh05_mode}, 444 {.compatible = "sharp,ls018b7dh02", &sharp_memory_ls018b7dh02_mode}, 445 {.compatible = "sharp,ls027b7dh01", &sharp_memory_ls027b7dh01_mode}, 446 {.compatible = "sharp,ls027b7dh01a", &sharp_memory_ls027b7dh01_mode}, 447 {.compatible = "sharp,ls032b7dd02", &sharp_memory_ls032b7dd02_mode}, 448 {.compatible = "sharp,ls044q7dh01", &sharp_memory_ls044q7dh01_mode}, 449 {}, 450 }; 451 MODULE_DEVICE_TABLE(of, sharp_memory_of_match); 452 453 static const u32 sharp_memory_formats[] = { 454 DRM_FORMAT_XRGB8888, 455 }; 456 457 static int sharp_memory_pipe_init(struct drm_device *dev, 458 struct sharp_memory_device *smd, 459 const u32 *formats, unsigned int format_count, 460 const u64 *format_modifiers) 461 { 462 int ret; 463 struct drm_encoder *encoder = &smd->encoder; 464 struct drm_plane *plane = &smd->plane; 465 struct drm_crtc *crtc = &smd->crtc; 466 struct drm_connector *connector = &smd->connector; 467 468 drm_plane_helper_add(plane, &sharp_memory_plane_helper_funcs); 469 ret = drm_universal_plane_init(dev, plane, 0, 470 &sharp_memory_plane_funcs, 471 formats, format_count, 472 format_modifiers, 473 DRM_PLANE_TYPE_PRIMARY, NULL); 474 if (ret) 475 return ret; 476 477 drm_crtc_helper_add(crtc, &sharp_memory_crtc_helper_funcs); 478 ret = drm_crtc_init_with_planes(dev, crtc, plane, NULL, 479 &sharp_memory_crtc_funcs, NULL); 480 if (ret) 481 return ret; 482 483 encoder->possible_crtcs = drm_crtc_mask(crtc); 484 ret = drm_encoder_init(dev, encoder, &sharp_memory_encoder_funcs, 485 DRM_MODE_ENCODER_NONE, NULL); 486 if (ret) 487 return ret; 488 489 ret = drm_connector_init(&smd->drm, &smd->connector, 490 &sharp_memory_connector_funcs, 491 DRM_MODE_CONNECTOR_SPI); 492 if (ret) 493 return ret; 494 495 drm_connector_helper_add(&smd->connector, 496 &sharp_memory_connector_hfuncs); 497 498 return drm_connector_attach_encoder(connector, encoder); 499 } 500 501 static int sharp_memory_init_pwm_vcom_signal(struct sharp_memory_device *smd) 502 { 503 int ret; 504 struct device *dev = &smd->spi->dev; 505 struct pwm_state pwm_state; 506 507 smd->pwm_vcom_signal = devm_pwm_get(dev, NULL); 508 if (IS_ERR(smd->pwm_vcom_signal)) 509 return dev_err_probe(dev, PTR_ERR(smd->pwm_vcom_signal), 510 "Could not get pwm device\n"); 511 512 pwm_init_state(smd->pwm_vcom_signal, &pwm_state); 513 pwm_set_relative_duty_cycle(&pwm_state, 1, 10); 514 pwm_state.enabled = true; 515 ret = pwm_apply_might_sleep(smd->pwm_vcom_signal, &pwm_state); 516 if (ret) 517 return dev_err_probe(dev, -EINVAL, "Could not apply pwm state\n"); 518 519 return 0; 520 } 521 522 static int sharp_memory_probe(struct spi_device *spi) 523 { 524 int ret; 525 struct device *dev; 526 struct sharp_memory_device *smd; 527 struct drm_device *drm; 528 const char *vcom_mode_str; 529 530 dev = &spi->dev; 531 532 ret = spi_setup(spi); 533 if (ret < 0) 534 return dev_err_probe(dev, ret, "Failed to setup spi device\n"); 535 536 if (!dev->coherent_dma_mask) { 537 ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32)); 538 if (ret) 539 return dev_err_probe(dev, ret, "Failed to set dma mask\n"); 540 } 541 542 smd = devm_drm_dev_alloc(dev, &sharp_memory_drm_driver, 543 struct sharp_memory_device, drm); 544 if (!smd) 545 return -ENOMEM; 546 547 spi_set_drvdata(spi, smd); 548 549 smd->spi = spi; 550 drm = &smd->drm; 551 ret = drmm_mode_config_init(drm); 552 if (ret) 553 return dev_err_probe(dev, ret, "Failed to initialize drm config\n"); 554 555 smd->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH); 556 if (!smd->enable_gpio) 557 dev_warn(dev, "Enable gpio not defined\n"); 558 559 drm->mode_config.funcs = &sharp_memory_mode_config_funcs; 560 smd->mode = spi_get_device_match_data(spi); 561 562 smd->pitch = (SHARP_ADDR_PERIOD + smd->mode->hdisplay + SHARP_DUMMY_PERIOD) / 8; 563 smd->tx_buffer_size = (SHARP_MODE_PERIOD + 564 (SHARP_ADDR_PERIOD + (smd->mode->hdisplay) + SHARP_DUMMY_PERIOD) * 565 smd->mode->vdisplay) / 8; 566 567 smd->tx_buffer = devm_kzalloc(dev, smd->tx_buffer_size, GFP_KERNEL); 568 if (!smd->tx_buffer) 569 return -ENOMEM; 570 571 mutex_init(&smd->tx_mutex); 572 573 /* 574 * VCOM is a signal that prevents DC bias from being built up in 575 * the panel resulting in pixels being forever stuck in one state. 576 * 577 * This driver supports three different methods to generate this 578 * signal depending on EXTMODE pin: 579 * 580 * software (EXTMODE = L) - This mode uses a kthread to 581 * periodically send a "maintain display" message to the display, 582 * toggling the vcom bit on and off with each message 583 * 584 * external (EXTMODE = H) - This mode relies on an external 585 * clock to generate the signal on the EXTCOMM pin 586 * 587 * pwm (EXTMODE = H) - This mode uses a pwm device to generate 588 * the signal on the EXTCOMM pin 589 * 590 */ 591 if (device_property_read_string(dev, "sharp,vcom-mode", &vcom_mode_str)) 592 return dev_err_probe(dev, -EINVAL, 593 "Unable to find sharp,vcom-mode node in device tree\n"); 594 595 if (!strcmp("software", vcom_mode_str)) { 596 smd->vcom_mode = SHARP_MEMORY_SOFTWARE_VCOM; 597 smd->sw_vcom_signal = kthread_run(sharp_memory_sw_vcom_signal_thread, 598 smd, "sw_vcom_signal"); 599 600 } else if (!strcmp("external", vcom_mode_str)) { 601 smd->vcom_mode = SHARP_MEMORY_EXTERNAL_VCOM; 602 603 } else if (!strcmp("pwm", vcom_mode_str)) { 604 smd->vcom_mode = SHARP_MEMORY_PWM_VCOM; 605 ret = sharp_memory_init_pwm_vcom_signal(smd); 606 if (ret) 607 return ret; 608 } else { 609 return dev_err_probe(dev, -EINVAL, "Invalid value set for vcom-mode\n"); 610 } 611 612 drm->mode_config.min_width = smd->mode->hdisplay; 613 drm->mode_config.max_width = smd->mode->hdisplay; 614 drm->mode_config.min_height = smd->mode->vdisplay; 615 drm->mode_config.max_height = smd->mode->vdisplay; 616 617 ret = sharp_memory_pipe_init(drm, smd, sharp_memory_formats, 618 ARRAY_SIZE(sharp_memory_formats), 619 NULL); 620 if (ret) 621 return dev_err_probe(dev, ret, "Failed to initialize display pipeline.\n"); 622 623 drm_plane_enable_fb_damage_clips(&smd->plane); 624 drm_mode_config_reset(drm); 625 626 ret = drm_dev_register(drm, 0); 627 if (ret) 628 return dev_err_probe(dev, ret, "Failed to register drm device.\n"); 629 630 drm_client_setup(drm, NULL); 631 632 return 0; 633 } 634 635 static void sharp_memory_remove(struct spi_device *spi) 636 { 637 struct sharp_memory_device *smd = spi_get_drvdata(spi); 638 639 drm_dev_unplug(&smd->drm); 640 drm_atomic_helper_shutdown(&smd->drm); 641 642 switch (smd->vcom_mode) { 643 case SHARP_MEMORY_SOFTWARE_VCOM: 644 kthread_stop(smd->sw_vcom_signal); 645 break; 646 647 case SHARP_MEMORY_EXTERNAL_VCOM: 648 break; 649 650 case SHARP_MEMORY_PWM_VCOM: 651 pwm_disable(smd->pwm_vcom_signal); 652 break; 653 } 654 } 655 656 static struct spi_driver sharp_memory_spi_driver = { 657 .driver = { 658 .name = "sharp_memory", 659 .of_match_table = sharp_memory_of_match, 660 }, 661 .probe = sharp_memory_probe, 662 .remove = sharp_memory_remove, 663 .id_table = sharp_memory_ids, 664 }; 665 module_spi_driver(sharp_memory_spi_driver); 666 667 MODULE_AUTHOR("Alex Lanzano <lanzano.alex@gmail.com>"); 668 MODULE_DESCRIPTION("SPI Protocol driver for the sharp_memory display"); 669 MODULE_LICENSE("GPL"); 670