1 /* 2 * Driver for the Solomon SSD1307 OLED controller 3 * 4 * Copyright 2012 Free Electrons 5 * 6 * Licensed under the GPLv2 or later. 7 */ 8 9 #include <linux/module.h> 10 #include <linux/backlight.h> 11 #include <linux/kernel.h> 12 #include <linux/i2c.h> 13 #include <linux/fb.h> 14 #include <linux/uaccess.h> 15 #include <linux/of_device.h> 16 #include <linux/of_gpio.h> 17 #include <linux/pwm.h> 18 #include <linux/delay.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_CHARGE_PUMP 0x8d 31 #define SSD1307FB_SEG_REMAP_ON 0xa1 32 #define SSD1307FB_DISPLAY_OFF 0xae 33 #define SSD1307FB_SET_MULTIPLEX_RATIO 0xa8 34 #define SSD1307FB_DISPLAY_ON 0xaf 35 #define SSD1307FB_START_PAGE_ADDRESS 0xb0 36 #define SSD1307FB_SET_DISPLAY_OFFSET 0xd3 37 #define SSD1307FB_SET_CLOCK_FREQ 0xd5 38 #define SSD1307FB_SET_PRECHARGE_PERIOD 0xd9 39 #define SSD1307FB_SET_COM_PINS_CONFIG 0xda 40 #define SSD1307FB_SET_VCOMH 0xdb 41 42 #define MAX_CONTRAST 255 43 44 #define REFRESHRATE 1 45 46 static u_int refreshrate = REFRESHRATE; 47 module_param(refreshrate, uint, 0); 48 49 struct ssd1307fb_par; 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 u32 com_invdir; 61 u32 com_lrremap; 62 u32 com_offset; 63 u32 com_seq; 64 u32 contrast; 65 u32 dclk_div; 66 u32 dclk_frq; 67 struct ssd1307fb_deviceinfo *device_info; 68 struct i2c_client *client; 69 u32 height; 70 struct fb_info *info; 71 u32 page_offset; 72 u32 prechargep1; 73 u32 prechargep2; 74 struct pwm_device *pwm; 75 u32 pwm_period; 76 int reset; 77 u32 seg_remap; 78 u32 vcomh; 79 u32 width; 80 }; 81 82 struct ssd1307fb_array { 83 u8 type; 84 u8 data[0]; 85 }; 86 87 static struct fb_fix_screeninfo ssd1307fb_fix = { 88 .id = "Solomon SSD1307", 89 .type = FB_TYPE_PACKED_PIXELS, 90 .visual = FB_VISUAL_MONO10, 91 .xpanstep = 0, 92 .ypanstep = 0, 93 .ywrapstep = 0, 94 .accel = FB_ACCEL_NONE, 95 }; 96 97 static struct fb_var_screeninfo ssd1307fb_var = { 98 .bits_per_pixel = 1, 99 }; 100 101 static struct ssd1307fb_array *ssd1307fb_alloc_array(u32 len, u8 type) 102 { 103 struct ssd1307fb_array *array; 104 105 array = kzalloc(sizeof(struct ssd1307fb_array) + len, GFP_KERNEL); 106 if (!array) 107 return NULL; 108 109 array->type = type; 110 111 return array; 112 } 113 114 static int ssd1307fb_write_array(struct i2c_client *client, 115 struct ssd1307fb_array *array, u32 len) 116 { 117 int ret; 118 119 len += sizeof(struct ssd1307fb_array); 120 121 ret = i2c_master_send(client, (u8 *)array, len); 122 if (ret != len) { 123 dev_err(&client->dev, "Couldn't send I2C command.\n"); 124 return ret; 125 } 126 127 return 0; 128 } 129 130 static inline int ssd1307fb_write_cmd(struct i2c_client *client, u8 cmd) 131 { 132 struct ssd1307fb_array *array; 133 int ret; 134 135 array = ssd1307fb_alloc_array(1, SSD1307FB_COMMAND); 136 if (!array) 137 return -ENOMEM; 138 139 array->data[0] = cmd; 140 141 ret = ssd1307fb_write_array(client, array, 1); 142 kfree(array); 143 144 return ret; 145 } 146 147 static void ssd1307fb_update_display(struct ssd1307fb_par *par) 148 { 149 struct ssd1307fb_array *array; 150 u8 *vmem = par->info->screen_base; 151 int i, j, k; 152 153 array = ssd1307fb_alloc_array(par->width * par->height / 8, 154 SSD1307FB_DATA); 155 if (!array) 156 return; 157 158 /* 159 * The screen is divided in pages, each having a height of 8 160 * pixels, and the width of the screen. When sending a byte of 161 * data to the controller, it gives the 8 bits for the current 162 * column. I.e, the first byte are the 8 bits of the first 163 * column, then the 8 bits for the second column, etc. 164 * 165 * 166 * Representation of the screen, assuming it is 5 bits 167 * wide. Each letter-number combination is a bit that controls 168 * one pixel. 169 * 170 * A0 A1 A2 A3 A4 171 * B0 B1 B2 B3 B4 172 * C0 C1 C2 C3 C4 173 * D0 D1 D2 D3 D4 174 * E0 E1 E2 E3 E4 175 * F0 F1 F2 F3 F4 176 * G0 G1 G2 G3 G4 177 * H0 H1 H2 H3 H4 178 * 179 * If you want to update this screen, you need to send 5 bytes: 180 * (1) A0 B0 C0 D0 E0 F0 G0 H0 181 * (2) A1 B1 C1 D1 E1 F1 G1 H1 182 * (3) A2 B2 C2 D2 E2 F2 G2 H2 183 * (4) A3 B3 C3 D3 E3 F3 G3 H3 184 * (5) A4 B4 C4 D4 E4 F4 G4 H4 185 */ 186 187 for (i = 0; i < (par->height / 8); i++) { 188 for (j = 0; j < par->width; j++) { 189 u32 array_idx = i * par->width + j; 190 array->data[array_idx] = 0; 191 for (k = 0; k < 8; k++) { 192 u32 page_length = par->width * i; 193 u32 index = page_length + (par->width * k + j) / 8; 194 u8 byte = *(vmem + index); 195 u8 bit = byte & (1 << (j % 8)); 196 bit = bit >> (j % 8); 197 array->data[array_idx] |= bit << k; 198 } 199 } 200 } 201 202 ssd1307fb_write_array(par->client, array, par->width * par->height / 8); 203 kfree(array); 204 } 205 206 207 static ssize_t ssd1307fb_write(struct fb_info *info, const char __user *buf, 208 size_t count, loff_t *ppos) 209 { 210 struct ssd1307fb_par *par = info->par; 211 unsigned long total_size; 212 unsigned long p = *ppos; 213 u8 __iomem *dst; 214 215 total_size = info->fix.smem_len; 216 217 if (p > total_size) 218 return -EINVAL; 219 220 if (count + p > total_size) 221 count = total_size - p; 222 223 if (!count) 224 return -EINVAL; 225 226 dst = (void __force *) (info->screen_base + p); 227 228 if (copy_from_user(dst, buf, count)) 229 return -EFAULT; 230 231 ssd1307fb_update_display(par); 232 233 *ppos += count; 234 235 return count; 236 } 237 238 static int ssd1307fb_blank(int blank_mode, struct fb_info *info) 239 { 240 struct ssd1307fb_par *par = info->par; 241 242 if (blank_mode != FB_BLANK_UNBLANK) 243 return ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_OFF); 244 else 245 return ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_ON); 246 } 247 248 static void ssd1307fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect) 249 { 250 struct ssd1307fb_par *par = info->par; 251 sys_fillrect(info, rect); 252 ssd1307fb_update_display(par); 253 } 254 255 static void ssd1307fb_copyarea(struct fb_info *info, const struct fb_copyarea *area) 256 { 257 struct ssd1307fb_par *par = info->par; 258 sys_copyarea(info, area); 259 ssd1307fb_update_display(par); 260 } 261 262 static void ssd1307fb_imageblit(struct fb_info *info, const struct fb_image *image) 263 { 264 struct ssd1307fb_par *par = info->par; 265 sys_imageblit(info, image); 266 ssd1307fb_update_display(par); 267 } 268 269 static struct fb_ops ssd1307fb_ops = { 270 .owner = THIS_MODULE, 271 .fb_read = fb_sys_read, 272 .fb_write = ssd1307fb_write, 273 .fb_blank = ssd1307fb_blank, 274 .fb_fillrect = ssd1307fb_fillrect, 275 .fb_copyarea = ssd1307fb_copyarea, 276 .fb_imageblit = ssd1307fb_imageblit, 277 }; 278 279 static void ssd1307fb_deferred_io(struct fb_info *info, 280 struct list_head *pagelist) 281 { 282 ssd1307fb_update_display(info->par); 283 } 284 285 static int ssd1307fb_init(struct ssd1307fb_par *par) 286 { 287 int ret; 288 u32 precharge, dclk, com_invdir, compins; 289 290 if (par->device_info->need_pwm) { 291 par->pwm = pwm_get(&par->client->dev, NULL); 292 if (IS_ERR(par->pwm)) { 293 dev_err(&par->client->dev, "Could not get PWM from device tree!\n"); 294 return PTR_ERR(par->pwm); 295 } 296 297 par->pwm_period = pwm_get_period(par->pwm); 298 /* Enable the PWM */ 299 pwm_config(par->pwm, par->pwm_period / 2, par->pwm_period); 300 pwm_enable(par->pwm); 301 302 dev_dbg(&par->client->dev, "Using PWM%d with a %dns period.\n", 303 par->pwm->pwm, par->pwm_period); 304 }; 305 306 /* Set initial contrast */ 307 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_CONTRAST); 308 if (ret < 0) 309 return ret; 310 311 ret = ssd1307fb_write_cmd(par->client, par->contrast); 312 if (ret < 0) 313 return ret; 314 315 /* Set segment re-map */ 316 if (par->seg_remap) { 317 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SEG_REMAP_ON); 318 if (ret < 0) 319 return ret; 320 }; 321 322 /* Set COM direction */ 323 com_invdir = 0xc0 | (par->com_invdir & 0x1) << 3; 324 ret = ssd1307fb_write_cmd(par->client, com_invdir); 325 if (ret < 0) 326 return ret; 327 328 /* Set multiplex ratio value */ 329 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_MULTIPLEX_RATIO); 330 if (ret < 0) 331 return ret; 332 333 ret = ssd1307fb_write_cmd(par->client, par->height - 1); 334 if (ret < 0) 335 return ret; 336 337 /* set display offset value */ 338 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_DISPLAY_OFFSET); 339 if (ret < 0) 340 return ret; 341 342 ret = ssd1307fb_write_cmd(par->client, par->com_offset); 343 if (ret < 0) 344 return ret; 345 346 /* Set clock frequency */ 347 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_CLOCK_FREQ); 348 if (ret < 0) 349 return ret; 350 351 dclk = ((par->dclk_div - 1) & 0xf) | (par->dclk_frq & 0xf) << 4; 352 ret = ssd1307fb_write_cmd(par->client, dclk); 353 if (ret < 0) 354 return ret; 355 356 /* Set precharge period in number of ticks from the internal clock */ 357 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_PRECHARGE_PERIOD); 358 if (ret < 0) 359 return ret; 360 361 precharge = (par->prechargep1 & 0xf) | (par->prechargep2 & 0xf) << 4; 362 ret = ssd1307fb_write_cmd(par->client, precharge); 363 if (ret < 0) 364 return ret; 365 366 /* Set COM pins configuration */ 367 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_COM_PINS_CONFIG); 368 if (ret < 0) 369 return ret; 370 371 compins = 0x02 | !(par->com_seq & 0x1) << 4 372 | (par->com_lrremap & 0x1) << 5; 373 ret = ssd1307fb_write_cmd(par->client, compins); 374 if (ret < 0) 375 return ret; 376 377 /* Set VCOMH */ 378 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_VCOMH); 379 if (ret < 0) 380 return ret; 381 382 ret = ssd1307fb_write_cmd(par->client, par->vcomh); 383 if (ret < 0) 384 return ret; 385 386 /* Turn on the DC-DC Charge Pump */ 387 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_CHARGE_PUMP); 388 if (ret < 0) 389 return ret; 390 391 ret = ssd1307fb_write_cmd(par->client, 392 (par->device_info->need_chargepump & 0x1 << 2) & 0x14); 393 if (ret < 0) 394 return ret; 395 396 /* Switch to horizontal addressing mode */ 397 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_ADDRESS_MODE); 398 if (ret < 0) 399 return ret; 400 401 ret = ssd1307fb_write_cmd(par->client, 402 SSD1307FB_SET_ADDRESS_MODE_HORIZONTAL); 403 if (ret < 0) 404 return ret; 405 406 /* Set column range */ 407 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_COL_RANGE); 408 if (ret < 0) 409 return ret; 410 411 ret = ssd1307fb_write_cmd(par->client, 0x0); 412 if (ret < 0) 413 return ret; 414 415 ret = ssd1307fb_write_cmd(par->client, par->width - 1); 416 if (ret < 0) 417 return ret; 418 419 /* Set page range */ 420 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_PAGE_RANGE); 421 if (ret < 0) 422 return ret; 423 424 ret = ssd1307fb_write_cmd(par->client, 0x0); 425 if (ret < 0) 426 return ret; 427 428 ret = ssd1307fb_write_cmd(par->client, 429 par->page_offset + (par->height / 8) - 1); 430 if (ret < 0) 431 return ret; 432 433 /* Turn on the display */ 434 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_ON); 435 if (ret < 0) 436 return ret; 437 438 return 0; 439 } 440 441 static int ssd1307fb_update_bl(struct backlight_device *bdev) 442 { 443 struct ssd1307fb_par *par = bl_get_data(bdev); 444 int ret; 445 int brightness = bdev->props.brightness; 446 447 par->contrast = brightness; 448 449 ret = ssd1307fb_write_cmd(par->client, SSD1307FB_CONTRAST); 450 if (ret < 0) 451 return ret; 452 ret = ssd1307fb_write_cmd(par->client, par->contrast); 453 if (ret < 0) 454 return ret; 455 return 0; 456 } 457 458 static int ssd1307fb_get_brightness(struct backlight_device *bdev) 459 { 460 struct ssd1307fb_par *par = bl_get_data(bdev); 461 462 return par->contrast; 463 } 464 465 static int ssd1307fb_check_fb(struct backlight_device *bdev, 466 struct fb_info *info) 467 { 468 return (info->bl_dev == bdev); 469 } 470 471 static const struct backlight_ops ssd1307fb_bl_ops = { 472 .options = BL_CORE_SUSPENDRESUME, 473 .update_status = ssd1307fb_update_bl, 474 .get_brightness = ssd1307fb_get_brightness, 475 .check_fb = ssd1307fb_check_fb, 476 }; 477 478 static struct ssd1307fb_deviceinfo ssd1307fb_ssd1305_deviceinfo = { 479 .default_vcomh = 0x34, 480 .default_dclk_div = 1, 481 .default_dclk_frq = 7, 482 }; 483 484 static struct ssd1307fb_deviceinfo ssd1307fb_ssd1306_deviceinfo = { 485 .default_vcomh = 0x20, 486 .default_dclk_div = 1, 487 .default_dclk_frq = 8, 488 .need_chargepump = 1, 489 }; 490 491 static struct ssd1307fb_deviceinfo ssd1307fb_ssd1307_deviceinfo = { 492 .default_vcomh = 0x20, 493 .default_dclk_div = 2, 494 .default_dclk_frq = 12, 495 .need_pwm = 1, 496 }; 497 498 static const struct of_device_id ssd1307fb_of_match[] = { 499 { 500 .compatible = "solomon,ssd1305fb-i2c", 501 .data = (void *)&ssd1307fb_ssd1305_deviceinfo, 502 }, 503 { 504 .compatible = "solomon,ssd1306fb-i2c", 505 .data = (void *)&ssd1307fb_ssd1306_deviceinfo, 506 }, 507 { 508 .compatible = "solomon,ssd1307fb-i2c", 509 .data = (void *)&ssd1307fb_ssd1307_deviceinfo, 510 }, 511 {}, 512 }; 513 MODULE_DEVICE_TABLE(of, ssd1307fb_of_match); 514 515 static int ssd1307fb_probe(struct i2c_client *client, 516 const struct i2c_device_id *id) 517 { 518 struct backlight_device *bl; 519 char bl_name[12]; 520 struct fb_info *info; 521 struct device_node *node = client->dev.of_node; 522 struct fb_deferred_io *ssd1307fb_defio; 523 u32 vmem_size; 524 struct ssd1307fb_par *par; 525 u8 *vmem; 526 int ret; 527 528 if (!node) { 529 dev_err(&client->dev, "No device tree data found!\n"); 530 return -EINVAL; 531 } 532 533 info = framebuffer_alloc(sizeof(struct ssd1307fb_par), &client->dev); 534 if (!info) { 535 dev_err(&client->dev, "Couldn't allocate framebuffer.\n"); 536 return -ENOMEM; 537 } 538 539 par = info->par; 540 par->info = info; 541 par->client = client; 542 543 par->device_info = (struct ssd1307fb_deviceinfo *)of_match_device( 544 ssd1307fb_of_match, &client->dev)->data; 545 546 par->reset = of_get_named_gpio(client->dev.of_node, 547 "reset-gpios", 0); 548 if (!gpio_is_valid(par->reset)) { 549 ret = -EINVAL; 550 goto fb_alloc_error; 551 } 552 553 if (of_property_read_u32(node, "solomon,width", &par->width)) 554 par->width = 96; 555 556 if (of_property_read_u32(node, "solomon,height", &par->height)) 557 par->height = 16; 558 559 if (of_property_read_u32(node, "solomon,page-offset", &par->page_offset)) 560 par->page_offset = 1; 561 562 if (of_property_read_u32(node, "solomon,com-offset", &par->com_offset)) 563 par->com_offset = 0; 564 565 if (of_property_read_u32(node, "solomon,prechargep1", &par->prechargep1)) 566 par->prechargep1 = 2; 567 568 if (of_property_read_u32(node, "solomon,prechargep2", &par->prechargep2)) 569 par->prechargep2 = 2; 570 571 par->seg_remap = !of_property_read_bool(node, "solomon,segment-no-remap"); 572 par->com_seq = of_property_read_bool(node, "solomon,com-seq"); 573 par->com_lrremap = of_property_read_bool(node, "solomon,com-lrremap"); 574 par->com_invdir = of_property_read_bool(node, "solomon,com-invdir"); 575 576 par->contrast = 127; 577 par->vcomh = par->device_info->default_vcomh; 578 579 /* Setup display timing */ 580 par->dclk_div = par->device_info->default_dclk_div; 581 par->dclk_frq = par->device_info->default_dclk_frq; 582 583 vmem_size = par->width * par->height / 8; 584 585 vmem = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 586 get_order(vmem_size)); 587 if (!vmem) { 588 dev_err(&client->dev, "Couldn't allocate graphical memory.\n"); 589 ret = -ENOMEM; 590 goto fb_alloc_error; 591 } 592 593 ssd1307fb_defio = devm_kzalloc(&client->dev, sizeof(struct fb_deferred_io), GFP_KERNEL); 594 if (!ssd1307fb_defio) { 595 dev_err(&client->dev, "Couldn't allocate deferred io.\n"); 596 ret = -ENOMEM; 597 goto fb_alloc_error; 598 } 599 600 ssd1307fb_defio->delay = HZ / refreshrate; 601 ssd1307fb_defio->deferred_io = ssd1307fb_deferred_io; 602 603 info->fbops = &ssd1307fb_ops; 604 info->fix = ssd1307fb_fix; 605 info->fix.line_length = par->width / 8; 606 info->fbdefio = ssd1307fb_defio; 607 608 info->var = ssd1307fb_var; 609 info->var.xres = par->width; 610 info->var.xres_virtual = par->width; 611 info->var.yres = par->height; 612 info->var.yres_virtual = par->height; 613 614 info->var.red.length = 1; 615 info->var.red.offset = 0; 616 info->var.green.length = 1; 617 info->var.green.offset = 0; 618 info->var.blue.length = 1; 619 info->var.blue.offset = 0; 620 621 info->screen_base = (u8 __force __iomem *)vmem; 622 info->fix.smem_start = __pa(vmem); 623 info->fix.smem_len = vmem_size; 624 625 fb_deferred_io_init(info); 626 627 ret = devm_gpio_request_one(&client->dev, par->reset, 628 GPIOF_OUT_INIT_HIGH, 629 "oled-reset"); 630 if (ret) { 631 dev_err(&client->dev, 632 "failed to request gpio %d: %d\n", 633 par->reset, ret); 634 goto reset_oled_error; 635 } 636 637 i2c_set_clientdata(client, info); 638 639 /* Reset the screen */ 640 gpio_set_value(par->reset, 0); 641 udelay(4); 642 gpio_set_value(par->reset, 1); 643 udelay(4); 644 645 ret = ssd1307fb_init(par); 646 if (ret) 647 goto reset_oled_error; 648 649 ret = register_framebuffer(info); 650 if (ret) { 651 dev_err(&client->dev, "Couldn't register the framebuffer\n"); 652 goto panel_init_error; 653 } 654 655 snprintf(bl_name, sizeof(bl_name), "ssd1307fb%d", info->node); 656 bl = backlight_device_register(bl_name, &client->dev, par, 657 &ssd1307fb_bl_ops, NULL); 658 if (IS_ERR(bl)) { 659 dev_err(&client->dev, "unable to register backlight device: %ld\n", 660 PTR_ERR(bl)); 661 goto bl_init_error; 662 } 663 664 bl->props.brightness = par->contrast; 665 bl->props.max_brightness = MAX_CONTRAST; 666 info->bl_dev = bl; 667 668 dev_info(&client->dev, "fb%d: %s framebuffer device registered, using %d bytes of video memory\n", info->node, info->fix.id, vmem_size); 669 670 return 0; 671 672 bl_init_error: 673 unregister_framebuffer(info); 674 panel_init_error: 675 if (par->device_info->need_pwm) { 676 pwm_disable(par->pwm); 677 pwm_put(par->pwm); 678 }; 679 reset_oled_error: 680 fb_deferred_io_cleanup(info); 681 fb_alloc_error: 682 framebuffer_release(info); 683 return ret; 684 } 685 686 static int ssd1307fb_remove(struct i2c_client *client) 687 { 688 struct fb_info *info = i2c_get_clientdata(client); 689 struct ssd1307fb_par *par = info->par; 690 691 ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_OFF); 692 693 backlight_device_unregister(info->bl_dev); 694 695 unregister_framebuffer(info); 696 if (par->device_info->need_pwm) { 697 pwm_disable(par->pwm); 698 pwm_put(par->pwm); 699 }; 700 fb_deferred_io_cleanup(info); 701 __free_pages(__va(info->fix.smem_start), get_order(info->fix.smem_len)); 702 framebuffer_release(info); 703 704 return 0; 705 } 706 707 static const struct i2c_device_id ssd1307fb_i2c_id[] = { 708 { "ssd1305fb", 0 }, 709 { "ssd1306fb", 0 }, 710 { "ssd1307fb", 0 }, 711 { } 712 }; 713 MODULE_DEVICE_TABLE(i2c, ssd1307fb_i2c_id); 714 715 static struct i2c_driver ssd1307fb_driver = { 716 .probe = ssd1307fb_probe, 717 .remove = ssd1307fb_remove, 718 .id_table = ssd1307fb_i2c_id, 719 .driver = { 720 .name = "ssd1307fb", 721 .of_match_table = ssd1307fb_of_match, 722 .owner = THIS_MODULE, 723 }, 724 }; 725 726 module_i2c_driver(ssd1307fb_driver); 727 728 MODULE_DESCRIPTION("FB driver for the Solomon SSD1307 OLED controller"); 729 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 730 MODULE_LICENSE("GPL"); 731