1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Driver for the Solomon SSD1307 OLED controller 4 * 5 * Copyright 2012 Free Electrons 6 */ 7 8 #include <linux/backlight.h> 9 #include <linux/delay.h> 10 #include <linux/fb.h> 11 #include <linux/gpio/consumer.h> 12 #include <linux/i2c.h> 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/property.h> 16 #include <linux/pwm.h> 17 #include <linux/uaccess.h> 18 #include <linux/regulator/consumer.h> 19 20 #define SSD1307FB_DATA 0x40 21 #define SSD1307FB_COMMAND 0x80 22 23 #define SSD1307FB_SET_ADDRESS_MODE 0x20 24 #define SSD1307FB_SET_ADDRESS_MODE_HORIZONTAL (0x00) 25 #define SSD1307FB_SET_ADDRESS_MODE_VERTICAL (0x01) 26 #define SSD1307FB_SET_ADDRESS_MODE_PAGE (0x02) 27 #define SSD1307FB_SET_COL_RANGE 0x21 28 #define SSD1307FB_SET_PAGE_RANGE 0x22 29 #define SSD1307FB_CONTRAST 0x81 30 #define SSD1307FB_SET_LOOKUP_TABLE 0x91 31 #define SSD1307FB_CHARGE_PUMP 0x8d 32 #define SSD1307FB_SEG_REMAP_ON 0xa1 33 #define SSD1307FB_DISPLAY_OFF 0xae 34 #define SSD1307FB_SET_MULTIPLEX_RATIO 0xa8 35 #define SSD1307FB_DISPLAY_ON 0xaf 36 #define SSD1307FB_START_PAGE_ADDRESS 0xb0 37 #define SSD1307FB_SET_DISPLAY_OFFSET 0xd3 38 #define SSD1307FB_SET_CLOCK_FREQ 0xd5 39 #define SSD1307FB_SET_AREA_COLOR_MODE 0xd8 40 #define SSD1307FB_SET_PRECHARGE_PERIOD 0xd9 41 #define SSD1307FB_SET_COM_PINS_CONFIG 0xda 42 #define SSD1307FB_SET_VCOMH 0xdb 43 44 #define MAX_CONTRAST 255 45 46 #define REFRESHRATE 1 47 48 static u_int refreshrate = REFRESHRATE; 49 module_param(refreshrate, uint, 0); 50 51 struct ssd1307fb_deviceinfo { 52 u32 default_vcomh; 53 u32 default_dclk_div; 54 u32 default_dclk_frq; 55 int need_pwm; 56 int need_chargepump; 57 }; 58 59 struct ssd1307fb_par { 60 unsigned area_color_enable : 1; 61 unsigned com_invdir : 1; 62 unsigned com_lrremap : 1; 63 unsigned com_seq : 1; 64 unsigned lookup_table_set : 1; 65 unsigned low_power : 1; 66 unsigned seg_remap : 1; 67 u32 com_offset; 68 u32 contrast; 69 u32 dclk_div; 70 u32 dclk_frq; 71 const struct ssd1307fb_deviceinfo *device_info; 72 struct i2c_client *client; 73 u32 height; 74 struct fb_info *info; 75 u8 lookup_table[4]; 76 u32 page_offset; 77 u32 prechargep1; 78 u32 prechargep2; 79 struct pwm_device *pwm; 80 struct gpio_desc *reset; 81 struct regulator *vbat_reg; 82 u32 vcomh; 83 u32 width; 84 }; 85 86 struct ssd1307fb_array { 87 u8 type; 88 u8 data[]; 89 }; 90 91 static const struct fb_fix_screeninfo ssd1307fb_fix = { 92 .id = "Solomon SSD1307", 93 .type = FB_TYPE_PACKED_PIXELS, 94 .visual = FB_VISUAL_MONO10, 95 .xpanstep = 0, 96 .ypanstep = 0, 97 .ywrapstep = 0, 98 .accel = FB_ACCEL_NONE, 99 }; 100 101 static const struct fb_var_screeninfo ssd1307fb_var = { 102 .bits_per_pixel = 1, 103 .red = { .length = 1 }, 104 .green = { .length = 1 }, 105 .blue = { .length = 1 }, 106 }; 107 108 static struct ssd1307fb_array *ssd1307fb_alloc_array(u32 len, u8 type) 109 { 110 struct ssd1307fb_array *array; 111 112 array = kzalloc(sizeof(struct ssd1307fb_array) + len, GFP_KERNEL); 113 if (!array) 114 return NULL; 115 116 array->type = type; 117 118 return array; 119 } 120 121 static int ssd1307fb_write_array(struct i2c_client *client, 122 struct ssd1307fb_array *array, u32 len) 123 { 124 int ret; 125 126 len += sizeof(struct ssd1307fb_array); 127 128 ret = i2c_master_send(client, (u8 *)array, len); 129 if (ret != len) { 130 dev_err(&client->dev, "Couldn't send I2C command.\n"); 131 return ret; 132 } 133 134 return 0; 135 } 136 137 static inline int ssd1307fb_write_cmd(struct i2c_client *client, u8 cmd) 138 { 139 struct ssd1307fb_array *array; 140 int ret; 141 142 array = ssd1307fb_alloc_array(1, SSD1307FB_COMMAND); 143 if (!array) 144 return -ENOMEM; 145 146 array->data[0] = cmd; 147 148 ret = ssd1307fb_write_array(client, array, 1); 149 kfree(array); 150 151 return ret; 152 } 153 154 static void ssd1307fb_update_display(struct ssd1307fb_par *par) 155 { 156 struct ssd1307fb_array *array; 157 u8 *vmem = par->info->screen_buffer; 158 unsigned int line_length = par->info->fix.line_length; 159 unsigned int pages = DIV_ROUND_UP(par->height, 8); 160 int i, j, k; 161 162 array = ssd1307fb_alloc_array(par->width * pages, SSD1307FB_DATA); 163 if (!array) 164 return; 165 166 /* 167 * The screen is divided in pages, each having a height of 8 168 * pixels, and the width of the screen. When sending a byte of 169 * data to the controller, it gives the 8 bits for the current 170 * column. I.e, the first byte are the 8 bits of the first 171 * column, then the 8 bits for the second column, etc. 172 * 173 * 174 * Representation of the screen, assuming it is 5 bits 175 * wide. Each letter-number combination is a bit that controls 176 * one pixel. 177 * 178 * A0 A1 A2 A3 A4 179 * B0 B1 B2 B3 B4 180 * C0 C1 C2 C3 C4 181 * D0 D1 D2 D3 D4 182 * E0 E1 E2 E3 E4 183 * F0 F1 F2 F3 F4 184 * G0 G1 G2 G3 G4 185 * H0 H1 H2 H3 H4 186 * 187 * If you want to update this screen, you need to send 5 bytes: 188 * (1) A0 B0 C0 D0 E0 F0 G0 H0 189 * (2) A1 B1 C1 D1 E1 F1 G1 H1 190 * (3) A2 B2 C2 D2 E2 F2 G2 H2 191 * (4) A3 B3 C3 D3 E3 F3 G3 H3 192 * (5) A4 B4 C4 D4 E4 F4 G4 H4 193 */ 194 195 for (i = 0; i < pages; i++) { 196 for (j = 0; j < par->width; j++) { 197 int m = 8; 198 u32 array_idx = i * par->width + j; 199 array->data[array_idx] = 0; 200 /* Last page may be partial */ 201 if (i + 1 == pages && par->height % 8) 202 m = par->height % 8; 203 for (k = 0; k < m; k++) { 204 u8 byte = vmem[(8 * i + k) * line_length + 205 j / 8]; 206 u8 bit = (byte >> (j % 8)) & 1; 207 array->data[array_idx] |= bit << k; 208 } 209 } 210 } 211 212 ssd1307fb_write_array(par->client, array, par->width * pages); 213 kfree(array); 214 } 215 216 217 static ssize_t ssd1307fb_write(struct fb_info *info, const char __user *buf, 218 size_t count, loff_t *ppos) 219 { 220 struct ssd1307fb_par *par = info->par; 221 unsigned long total_size; 222 unsigned long p = *ppos; 223 void *dst; 224 225 total_size = info->fix.smem_len; 226 227 if (p > total_size) 228 return -EINVAL; 229 230 if (count + p > total_size) 231 count = total_size - p; 232 233 if (!count) 234 return -EINVAL; 235 236 dst = info->screen_buffer + p; 237 238 if (copy_from_user(dst, buf, count)) 239 return -EFAULT; 240 241 ssd1307fb_update_display(par); 242 243 *ppos += count; 244 245 return count; 246 } 247 248 static int ssd1307fb_blank(int blank_mode, struct fb_info *info) 249 { 250 struct ssd1307fb_par *par = info->par; 251 252 if (blank_mode != FB_BLANK_UNBLANK) 253 return ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_OFF); 254 else 255 return ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_ON); 256 } 257 258 static void ssd1307fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect) 259 { 260 struct ssd1307fb_par *par = info->par; 261 sys_fillrect(info, rect); 262 ssd1307fb_update_display(par); 263 } 264 265 static void ssd1307fb_copyarea(struct fb_info *info, const struct fb_copyarea *area) 266 { 267 struct ssd1307fb_par *par = info->par; 268 sys_copyarea(info, area); 269 ssd1307fb_update_display(par); 270 } 271 272 static void ssd1307fb_imageblit(struct fb_info *info, const struct fb_image *image) 273 { 274 struct ssd1307fb_par *par = info->par; 275 sys_imageblit(info, image); 276 ssd1307fb_update_display(par); 277 } 278 279 static const struct fb_ops ssd1307fb_ops = { 280 .owner = THIS_MODULE, 281 .fb_read = fb_sys_read, 282 .fb_write = ssd1307fb_write, 283 .fb_blank = ssd1307fb_blank, 284 .fb_fillrect = ssd1307fb_fillrect, 285 .fb_copyarea = ssd1307fb_copyarea, 286 .fb_imageblit = ssd1307fb_imageblit, 287 }; 288 289 static void ssd1307fb_deferred_io(struct fb_info *info, 290 struct list_head *pagelist) 291 { 292 ssd1307fb_update_display(info->par); 293 } 294 295 static int ssd1307fb_init(struct ssd1307fb_par *par) 296 { 297 struct pwm_state pwmstate; 298 int ret; 299 u32 precharge, dclk, com_invdir, compins; 300 301 if (par->device_info->need_pwm) { 302 par->pwm = pwm_get(&par->client->dev, NULL); 303 if (IS_ERR(par->pwm)) { 304 dev_err(&par->client->dev, "Could not get PWM from device tree!\n"); 305 return PTR_ERR(par->pwm); 306 } 307 308 pwm_init_state(par->pwm, &pwmstate); 309 pwm_set_relative_duty_cycle(&pwmstate, 50, 100); 310 pwm_apply_state(par->pwm, &pwmstate); 311 312 /* Enable the PWM */ 313 pwm_enable(par->pwm); 314 315 dev_dbg(&par->client->dev, "Using PWM%d with a %lluns period.\n", 316 par->pwm->pwm, pwm_get_period(par->pwm)); 317 } 318 319 /* Set initial contrast */ 320 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_CONTRAST); 321 if (ret < 0) 322 return ret; 323 324 ret = ssd1307fb_write_cmd(par->client, par->contrast); 325 if (ret < 0) 326 return ret; 327 328 /* Set segment re-map */ 329 if (par->seg_remap) { 330 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SEG_REMAP_ON); 331 if (ret < 0) 332 return ret; 333 } 334 335 /* Set COM direction */ 336 com_invdir = 0xc0 | par->com_invdir << 3; 337 ret = ssd1307fb_write_cmd(par->client, com_invdir); 338 if (ret < 0) 339 return ret; 340 341 /* Set multiplex ratio value */ 342 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_MULTIPLEX_RATIO); 343 if (ret < 0) 344 return ret; 345 346 ret = ssd1307fb_write_cmd(par->client, par->height - 1); 347 if (ret < 0) 348 return ret; 349 350 /* set display offset value */ 351 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_DISPLAY_OFFSET); 352 if (ret < 0) 353 return ret; 354 355 ret = ssd1307fb_write_cmd(par->client, par->com_offset); 356 if (ret < 0) 357 return ret; 358 359 /* Set clock frequency */ 360 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_CLOCK_FREQ); 361 if (ret < 0) 362 return ret; 363 364 dclk = ((par->dclk_div - 1) & 0xf) | (par->dclk_frq & 0xf) << 4; 365 ret = ssd1307fb_write_cmd(par->client, dclk); 366 if (ret < 0) 367 return ret; 368 369 /* Set Set Area Color Mode ON/OFF & Low Power Display Mode */ 370 if (par->area_color_enable || par->low_power) { 371 u32 mode; 372 373 ret = ssd1307fb_write_cmd(par->client, 374 SSD1307FB_SET_AREA_COLOR_MODE); 375 if (ret < 0) 376 return ret; 377 378 mode = (par->area_color_enable ? 0x30 : 0) | 379 (par->low_power ? 5 : 0); 380 ret = ssd1307fb_write_cmd(par->client, mode); 381 if (ret < 0) 382 return ret; 383 } 384 385 /* Set precharge period in number of ticks from the internal clock */ 386 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_PRECHARGE_PERIOD); 387 if (ret < 0) 388 return ret; 389 390 precharge = (par->prechargep1 & 0xf) | (par->prechargep2 & 0xf) << 4; 391 ret = ssd1307fb_write_cmd(par->client, precharge); 392 if (ret < 0) 393 return ret; 394 395 /* Set COM pins configuration */ 396 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_COM_PINS_CONFIG); 397 if (ret < 0) 398 return ret; 399 400 compins = 0x02 | !par->com_seq << 4 | par->com_lrremap << 5; 401 ret = ssd1307fb_write_cmd(par->client, compins); 402 if (ret < 0) 403 return ret; 404 405 /* Set VCOMH */ 406 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_VCOMH); 407 if (ret < 0) 408 return ret; 409 410 ret = ssd1307fb_write_cmd(par->client, par->vcomh); 411 if (ret < 0) 412 return ret; 413 414 /* Turn on the DC-DC Charge Pump */ 415 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_CHARGE_PUMP); 416 if (ret < 0) 417 return ret; 418 419 ret = ssd1307fb_write_cmd(par->client, 420 BIT(4) | (par->device_info->need_chargepump ? BIT(2) : 0)); 421 if (ret < 0) 422 return ret; 423 424 /* Set lookup table */ 425 if (par->lookup_table_set) { 426 int i; 427 428 ret = ssd1307fb_write_cmd(par->client, 429 SSD1307FB_SET_LOOKUP_TABLE); 430 if (ret < 0) 431 return ret; 432 433 for (i = 0; i < ARRAY_SIZE(par->lookup_table); ++i) { 434 u8 val = par->lookup_table[i]; 435 436 if (val < 31 || val > 63) 437 dev_warn(&par->client->dev, 438 "lookup table index %d value out of range 31 <= %d <= 63\n", 439 i, val); 440 ret = ssd1307fb_write_cmd(par->client, val); 441 if (ret < 0) 442 return ret; 443 } 444 } 445 446 /* Switch to horizontal addressing mode */ 447 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_ADDRESS_MODE); 448 if (ret < 0) 449 return ret; 450 451 ret = ssd1307fb_write_cmd(par->client, 452 SSD1307FB_SET_ADDRESS_MODE_HORIZONTAL); 453 if (ret < 0) 454 return ret; 455 456 /* Set column range */ 457 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_COL_RANGE); 458 if (ret < 0) 459 return ret; 460 461 ret = ssd1307fb_write_cmd(par->client, 0x0); 462 if (ret < 0) 463 return ret; 464 465 ret = ssd1307fb_write_cmd(par->client, par->width - 1); 466 if (ret < 0) 467 return ret; 468 469 /* Set page range */ 470 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_PAGE_RANGE); 471 if (ret < 0) 472 return ret; 473 474 ret = ssd1307fb_write_cmd(par->client, par->page_offset); 475 if (ret < 0) 476 return ret; 477 478 ret = ssd1307fb_write_cmd(par->client, 479 par->page_offset + 480 DIV_ROUND_UP(par->height, 8) - 1); 481 if (ret < 0) 482 return ret; 483 484 /* Clear the screen */ 485 ssd1307fb_update_display(par); 486 487 /* Turn on the display */ 488 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_ON); 489 if (ret < 0) 490 return ret; 491 492 return 0; 493 } 494 495 static int ssd1307fb_update_bl(struct backlight_device *bdev) 496 { 497 struct ssd1307fb_par *par = bl_get_data(bdev); 498 int ret; 499 int brightness = bdev->props.brightness; 500 501 par->contrast = brightness; 502 503 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_CONTRAST); 504 if (ret < 0) 505 return ret; 506 ret = ssd1307fb_write_cmd(par->client, par->contrast); 507 if (ret < 0) 508 return ret; 509 return 0; 510 } 511 512 static int ssd1307fb_get_brightness(struct backlight_device *bdev) 513 { 514 struct ssd1307fb_par *par = bl_get_data(bdev); 515 516 return par->contrast; 517 } 518 519 static int ssd1307fb_check_fb(struct backlight_device *bdev, 520 struct fb_info *info) 521 { 522 return (info->bl_dev == bdev); 523 } 524 525 static const struct backlight_ops ssd1307fb_bl_ops = { 526 .options = BL_CORE_SUSPENDRESUME, 527 .update_status = ssd1307fb_update_bl, 528 .get_brightness = ssd1307fb_get_brightness, 529 .check_fb = ssd1307fb_check_fb, 530 }; 531 532 static struct ssd1307fb_deviceinfo ssd1307fb_ssd1305_deviceinfo = { 533 .default_vcomh = 0x34, 534 .default_dclk_div = 1, 535 .default_dclk_frq = 7, 536 }; 537 538 static struct ssd1307fb_deviceinfo ssd1307fb_ssd1306_deviceinfo = { 539 .default_vcomh = 0x20, 540 .default_dclk_div = 1, 541 .default_dclk_frq = 8, 542 .need_chargepump = 1, 543 }; 544 545 static struct ssd1307fb_deviceinfo ssd1307fb_ssd1307_deviceinfo = { 546 .default_vcomh = 0x20, 547 .default_dclk_div = 2, 548 .default_dclk_frq = 12, 549 .need_pwm = 1, 550 }; 551 552 static struct ssd1307fb_deviceinfo ssd1307fb_ssd1309_deviceinfo = { 553 .default_vcomh = 0x34, 554 .default_dclk_div = 1, 555 .default_dclk_frq = 10, 556 }; 557 558 static const struct of_device_id ssd1307fb_of_match[] = { 559 { 560 .compatible = "solomon,ssd1305fb-i2c", 561 .data = (void *)&ssd1307fb_ssd1305_deviceinfo, 562 }, 563 { 564 .compatible = "solomon,ssd1306fb-i2c", 565 .data = (void *)&ssd1307fb_ssd1306_deviceinfo, 566 }, 567 { 568 .compatible = "solomon,ssd1307fb-i2c", 569 .data = (void *)&ssd1307fb_ssd1307_deviceinfo, 570 }, 571 { 572 .compatible = "solomon,ssd1309fb-i2c", 573 .data = (void *)&ssd1307fb_ssd1309_deviceinfo, 574 }, 575 {}, 576 }; 577 MODULE_DEVICE_TABLE(of, ssd1307fb_of_match); 578 579 static int ssd1307fb_probe(struct i2c_client *client) 580 { 581 struct device *dev = &client->dev; 582 struct backlight_device *bl; 583 char bl_name[12]; 584 struct fb_info *info; 585 struct fb_deferred_io *ssd1307fb_defio; 586 u32 vmem_size; 587 struct ssd1307fb_par *par; 588 void *vmem; 589 int ret; 590 591 info = framebuffer_alloc(sizeof(struct ssd1307fb_par), dev); 592 if (!info) 593 return -ENOMEM; 594 595 par = info->par; 596 par->info = info; 597 par->client = client; 598 599 par->device_info = device_get_match_data(dev); 600 601 par->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); 602 if (IS_ERR(par->reset)) { 603 dev_err(dev, "failed to get reset gpio: %ld\n", 604 PTR_ERR(par->reset)); 605 ret = PTR_ERR(par->reset); 606 goto fb_alloc_error; 607 } 608 609 par->vbat_reg = devm_regulator_get_optional(dev, "vbat"); 610 if (IS_ERR(par->vbat_reg)) { 611 ret = PTR_ERR(par->vbat_reg); 612 if (ret == -ENODEV) { 613 par->vbat_reg = NULL; 614 } else { 615 dev_err(dev, "failed to get VBAT regulator: %d\n", ret); 616 goto fb_alloc_error; 617 } 618 } 619 620 if (device_property_read_u32(dev, "solomon,width", &par->width)) 621 par->width = 96; 622 623 if (device_property_read_u32(dev, "solomon,height", &par->height)) 624 par->height = 16; 625 626 if (device_property_read_u32(dev, "solomon,page-offset", &par->page_offset)) 627 par->page_offset = 1; 628 629 if (device_property_read_u32(dev, "solomon,com-offset", &par->com_offset)) 630 par->com_offset = 0; 631 632 if (device_property_read_u32(dev, "solomon,prechargep1", &par->prechargep1)) 633 par->prechargep1 = 2; 634 635 if (device_property_read_u32(dev, "solomon,prechargep2", &par->prechargep2)) 636 par->prechargep2 = 2; 637 638 if (!device_property_read_u8_array(dev, "solomon,lookup-table", 639 par->lookup_table, 640 ARRAY_SIZE(par->lookup_table))) 641 par->lookup_table_set = 1; 642 643 par->seg_remap = !device_property_read_bool(dev, "solomon,segment-no-remap"); 644 par->com_seq = device_property_read_bool(dev, "solomon,com-seq"); 645 par->com_lrremap = device_property_read_bool(dev, "solomon,com-lrremap"); 646 par->com_invdir = device_property_read_bool(dev, "solomon,com-invdir"); 647 par->area_color_enable = 648 device_property_read_bool(dev, "solomon,area-color-enable"); 649 par->low_power = device_property_read_bool(dev, "solomon,low-power"); 650 651 par->contrast = 127; 652 par->vcomh = par->device_info->default_vcomh; 653 654 /* Setup display timing */ 655 if (device_property_read_u32(dev, "solomon,dclk-div", &par->dclk_div)) 656 par->dclk_div = par->device_info->default_dclk_div; 657 if (device_property_read_u32(dev, "solomon,dclk-frq", &par->dclk_frq)) 658 par->dclk_frq = par->device_info->default_dclk_frq; 659 660 vmem_size = DIV_ROUND_UP(par->width, 8) * par->height; 661 662 vmem = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 663 get_order(vmem_size)); 664 if (!vmem) { 665 dev_err(dev, "Couldn't allocate graphical memory.\n"); 666 ret = -ENOMEM; 667 goto fb_alloc_error; 668 } 669 670 ssd1307fb_defio = devm_kzalloc(dev, sizeof(*ssd1307fb_defio), 671 GFP_KERNEL); 672 if (!ssd1307fb_defio) { 673 dev_err(dev, "Couldn't allocate deferred io.\n"); 674 ret = -ENOMEM; 675 goto fb_alloc_error; 676 } 677 678 ssd1307fb_defio->delay = HZ / refreshrate; 679 ssd1307fb_defio->deferred_io = ssd1307fb_deferred_io; 680 681 info->fbops = &ssd1307fb_ops; 682 info->fix = ssd1307fb_fix; 683 info->fix.line_length = DIV_ROUND_UP(par->width, 8); 684 info->fbdefio = ssd1307fb_defio; 685 686 info->var = ssd1307fb_var; 687 info->var.xres = par->width; 688 info->var.xres_virtual = par->width; 689 info->var.yres = par->height; 690 info->var.yres_virtual = par->height; 691 692 info->screen_buffer = vmem; 693 info->fix.smem_start = __pa(vmem); 694 info->fix.smem_len = vmem_size; 695 696 fb_deferred_io_init(info); 697 698 i2c_set_clientdata(client, info); 699 700 if (par->reset) { 701 /* Reset the screen */ 702 gpiod_set_value_cansleep(par->reset, 1); 703 udelay(4); 704 gpiod_set_value_cansleep(par->reset, 0); 705 udelay(4); 706 } 707 708 if (par->vbat_reg) { 709 ret = regulator_enable(par->vbat_reg); 710 if (ret) { 711 dev_err(dev, "failed to enable VBAT: %d\n", ret); 712 goto reset_oled_error; 713 } 714 } 715 716 ret = ssd1307fb_init(par); 717 if (ret) 718 goto regulator_enable_error; 719 720 ret = register_framebuffer(info); 721 if (ret) { 722 dev_err(dev, "Couldn't register the framebuffer\n"); 723 goto panel_init_error; 724 } 725 726 snprintf(bl_name, sizeof(bl_name), "ssd1307fb%d", info->node); 727 bl = backlight_device_register(bl_name, dev, par, &ssd1307fb_bl_ops, 728 NULL); 729 if (IS_ERR(bl)) { 730 ret = PTR_ERR(bl); 731 dev_err(dev, "unable to register backlight device: %d\n", ret); 732 goto bl_init_error; 733 } 734 735 bl->props.brightness = par->contrast; 736 bl->props.max_brightness = MAX_CONTRAST; 737 info->bl_dev = bl; 738 739 dev_info(dev, "fb%d: %s framebuffer device registered, using %d bytes of video memory\n", info->node, info->fix.id, vmem_size); 740 741 return 0; 742 743 bl_init_error: 744 unregister_framebuffer(info); 745 panel_init_error: 746 if (par->device_info->need_pwm) { 747 pwm_disable(par->pwm); 748 pwm_put(par->pwm); 749 } 750 regulator_enable_error: 751 if (par->vbat_reg) 752 regulator_disable(par->vbat_reg); 753 reset_oled_error: 754 fb_deferred_io_cleanup(info); 755 fb_alloc_error: 756 framebuffer_release(info); 757 return ret; 758 } 759 760 static int ssd1307fb_remove(struct i2c_client *client) 761 { 762 struct fb_info *info = i2c_get_clientdata(client); 763 struct ssd1307fb_par *par = info->par; 764 765 ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_OFF); 766 767 backlight_device_unregister(info->bl_dev); 768 769 unregister_framebuffer(info); 770 if (par->device_info->need_pwm) { 771 pwm_disable(par->pwm); 772 pwm_put(par->pwm); 773 } 774 if (par->vbat_reg) 775 regulator_disable(par->vbat_reg); 776 fb_deferred_io_cleanup(info); 777 __free_pages(__va(info->fix.smem_start), get_order(info->fix.smem_len)); 778 framebuffer_release(info); 779 780 return 0; 781 } 782 783 static const struct i2c_device_id ssd1307fb_i2c_id[] = { 784 { "ssd1305fb", 0 }, 785 { "ssd1306fb", 0 }, 786 { "ssd1307fb", 0 }, 787 { "ssd1309fb", 0 }, 788 { } 789 }; 790 MODULE_DEVICE_TABLE(i2c, ssd1307fb_i2c_id); 791 792 static struct i2c_driver ssd1307fb_driver = { 793 .probe_new = ssd1307fb_probe, 794 .remove = ssd1307fb_remove, 795 .id_table = ssd1307fb_i2c_id, 796 .driver = { 797 .name = "ssd1307fb", 798 .of_match_table = ssd1307fb_of_match, 799 }, 800 }; 801 802 module_i2c_driver(ssd1307fb_driver); 803 804 MODULE_DESCRIPTION("FB driver for the Solomon SSD1307 OLED controller"); 805 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 806 MODULE_LICENSE("GPL"); 807