blob: 116e808d71cd1819512e197af5aed5efd9b1346c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/drivers/video/epson1355fb.c -- Epson S1D13505 frame buffer for 2.5.
3 *
4 * Epson Research S1D13505 Embedded RAMDAC LCD/CRT Controller
5 * (previously known as SED1355)
6 *
7 * Cf. http://www.erd.epson.com/vdc/html/S1D13505.html
8 *
9 *
10 * Copyright (C) Hewlett-Packard Company. All rights reserved.
11 *
12 * Written by Christopher Hoover <ch@hpl.hp.com>
13 *
14 * Adapted from:
15 *
16 * linux/drivers/video/skeletonfb.c
17 * Modified to new api Jan 2001 by James Simmons (jsimmons@infradead.org)
18 * Created 28 Dec 1997 by Geert Uytterhoeven
19 *
20 * linux/drivers/video/epson1355fb.c (2.4 driver)
21 * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
22 *
23 * This file is subject to the terms and conditions of the GNU General Public
24 * License. See the file COPYING in the main directory of this archive for
25 * more details.
26 *
27 *
28 * Noteworthy Issues
29 * -----------------
30 *
31 * This driver is complicated by the fact that this is a 16-bit chip
32 * and, on at least one platform (ceiva), we can only do 16-bit reads
33 * and writes to the framebuffer. We hide this from user space
34 * except in the case of mmap().
35 *
36 *
37 * To Do
38 * -----
39 *
40 * - Test 8-bit pseudocolor mode
41 * - Allow setting bpp, virtual resolution
42 * - Implement horizontal panning
43 * - (maybe) Implement hardware cursor
44 */
45
46#include <linux/module.h>
47#include <linux/kernel.h>
48#include <linux/errno.h>
49#include <linux/string.h>
50#include <linux/mm.h>
51#include <linux/tty.h>
52#include <linux/slab.h>
53#include <linux/delay.h>
54#include <linux/fb.h>
55#include <linux/init.h>
56#include <linux/ioport.h>
57#include <asm/types.h>
58#include <asm/io.h>
59#include <asm/uaccess.h>
60
61#include <video/epson1355.h>
62
63struct epson1355_par {
64 unsigned long reg_addr;
65};
66
67/* ------------------------------------------------------------------------- */
68
69#ifdef CONFIG_SUPERH
70
71static inline u8 epson1355_read_reg(int index)
72{
73 return ctrl_inb(par.reg_addr + index);
74}
75
76static inline void epson1355_write_reg(u8 data, int index)
77{
78 ctrl_outb(data, par.reg_addr + index);
79}
80
81#elif defined(CONFIG_ARM)
82
83# ifdef CONFIG_ARCH_CEIVA
84# include <asm/arch/hardware.h>
85# define EPSON1355FB_BASE_PHYS (CEIVA_PHYS_SED1355)
86# endif
87
88static inline u8 epson1355_read_reg(struct epson1355_par *par, int index)
89{
90 return __raw_readb(par->reg_addr + index);
91}
92
93static inline void epson1355_write_reg(struct epson1355_par *par, u8 data, int index)
94{
95 __raw_writeb(data, par->reg_addr + index);
96}
97
98#else
99# error "no architecture-specific epson1355_{read,write}_reg"
100#endif
101
102#ifndef EPSON1355FB_BASE_PHYS
103# error "EPSON1355FB_BASE_PHYS is not defined"
104#endif
105
106#define EPSON1355FB_REGS_OFS (0)
107#define EPSON1355FB_REGS_PHYS (EPSON1355FB_BASE_PHYS + EPSON1355FB_REGS_OFS)
108#define EPSON1355FB_REGS_LEN (64)
109
110#define EPSON1355FB_FB_OFS (0x00200000)
111#define EPSON1355FB_FB_PHYS (EPSON1355FB_BASE_PHYS + EPSON1355FB_FB_OFS)
112#define EPSON1355FB_FB_LEN (2 * 1024 * 1024)
113
114/* ------------------------------------------------------------------------- */
115
116static inline u16 epson1355_read_reg16(struct epson1355_par *par, int index)
117{
118 u8 lo = epson1355_read_reg(par, index);
119 u8 hi = epson1355_read_reg(par, index + 1);
120
121 return (hi << 8) | lo;
122}
123
124static inline void epson1355_write_reg16(struct epson1355_par *par, u16 data, int index)
125{
126 u8 lo = data & 0xff;
127 u8 hi = (data >> 8) & 0xff;
128
129 epson1355_write_reg(par, lo, index);
130 epson1355_write_reg(par, hi, index + 1);
131}
132
133static inline u32 epson1355_read_reg20(struct epson1355_par *par, int index)
134{
135 u8 b0 = epson1355_read_reg(par, index);
136 u8 b1 = epson1355_read_reg(par, index + 1);
137 u8 b2 = epson1355_read_reg(par, index + 2);
138
139 return (b2 & 0x0f) << 16 | (b1 << 8) | b0;
140}
141
142static inline void epson1355_write_reg20(struct epson1355_par *par, u32 data, int index)
143{
144 u8 b0 = data & 0xff;
145 u8 b1 = (data >> 8) & 0xff;
146 u8 b2 = (data >> 16) & 0x0f;
147
148 epson1355_write_reg(par, b0, index);
149 epson1355_write_reg(par, b1, index + 1);
150 epson1355_write_reg(par, b2, index + 2);
151}
152
153/* ------------------------------------------------------------------------- */
154
155static void set_lut(struct epson1355_par *par, u8 index, u8 r, u8 g, u8 b)
156{
157 epson1355_write_reg(par, index, REG_LUT_ADDR);
158 epson1355_write_reg(par, r, REG_LUT_DATA);
159 epson1355_write_reg(par, g, REG_LUT_DATA);
160 epson1355_write_reg(par, b, REG_LUT_DATA);
161}
162
163
164/**
165 * epson1355fb_setcolreg - sets a color register.
166 * @regno: Which register in the CLUT we are programming
167 * @red: The red value which can be up to 16 bits wide
168 * @green: The green value which can be up to 16 bits wide
169 * @blue: The blue value which can be up to 16 bits wide.
170 * @transp: If supported the alpha value which can be up to 16 bits wide.
171 * @info: frame buffer info structure
172 *
173 * Returns negative errno on error, or zero on success.
174 */
175static int epson1355fb_setcolreg(unsigned regno, unsigned r, unsigned g,
176 unsigned b, unsigned transp,
177 struct fb_info *info)
178{
179 struct epson1355_par *par = info->par;
180
181 if (info->var.grayscale)
182 r = g = b = (19595 * r + 38470 * g + 7471 * b) >> 16;
183
184 switch (info->fix.visual) {
185 case FB_VISUAL_TRUECOLOR:
186 if (regno >= 16)
187 return -EINVAL;
188
189 ((u32 *) info->pseudo_palette)[regno] =
190 (r & 0xf800) | (g & 0xfc00) >> 5 | (b & 0xf800) >> 11;
191
192 break;
193 case FB_VISUAL_PSEUDOCOLOR:
194 if (regno >= 256)
195 return -EINVAL;
196
197 set_lut(par, regno, r >> 8, g >> 8, b >> 8);
198
199 break;
200 default:
201 return -ENOSYS;
202 }
203 return 0;
204}
205
206/* ------------------------------------------------------------------------- */
207
208/**
209 * epson1355fb_pan_display - Pans the display.
210 * @var: frame buffer variable screen structure
211 * @info: frame buffer structure that represents a single frame buffer
212 *
213 * Pan (or wrap, depending on the `vmode' field) the display using the
214 * `xoffset' and `yoffset' fields of the `var' structure.
215 * If the values don't fit, return -EINVAL.
216 *
217 * Returns negative errno on error, or zero on success.
218 */
219static int epson1355fb_pan_display(struct fb_var_screeninfo *var,
220 struct fb_info *info)
221{
222 struct epson1355_par *par = info->par;
223 u32 start;
224
225 if (var->xoffset != 0) /* not yet ... */
226 return -EINVAL;
227
228 if (var->yoffset + info->var.yres > info->var.yres_virtual)
229 return -EINVAL;
230
231 start = (info->fix.line_length >> 1) * var->yoffset;
232
233 epson1355_write_reg20(par, start, REG_SCRN1_DISP_START_ADDR0);
234
235 return 0;
236}
237
238/* ------------------------------------------------------------------------- */
239
240static void lcd_enable(struct epson1355_par *par, int enable)
241{
242 u8 mode = epson1355_read_reg(par, REG_DISPLAY_MODE);
243
244 if (enable)
245 mode |= 1;
246 else
247 mode &= ~1;
248
249 epson1355_write_reg(par, mode, REG_DISPLAY_MODE);
250}
251
252#if defined(CONFIG_ARCH_CEIVA)
253static void backlight_enable(int enable)
254{
255 /* ### this should be protected by a spinlock ... */
256 u8 pddr = clps_readb(PDDR);
257 if (enable)
258 pddr |= (1 << 5);
259 else
260 pddr &= ~(1 << 5);
261 clps_writeb(pddr, PDDR);
262}
263#else
264static void backlight_enable(int enable)
265{
266}
267#endif
268
269
270/**
271 * epson1355fb_blank - blanks the display.
272 * @blank_mode: the blank mode we want.
273 * @info: frame buffer structure that represents a single frame buffer
274 *
275 * Blank the screen if blank_mode != 0, else unblank. Return 0 if
276 * blanking succeeded, != 0 if un-/blanking failed due to e.g. a
277 * video mode which doesn't support it. Implements VESA suspend
278 * and powerdown modes on hardware that supports disabling hsync/vsync:
279 * blank_mode == 2: suspend vsync
280 * blank_mode == 3: suspend hsync
281 * blank_mode == 4: powerdown
282 *
283 * Returns negative errno on error, or zero on success.
284 *
285 */
286static int epson1355fb_blank(int blank_mode, struct fb_info *info)
287{
288 struct epson1355_par *par = info->par;
289
290 switch (blank_mode) {
291 case FB_BLANK_UNBLANKING:
292 case FB_BLANK_NORMAL:
293 lcd_enable(par, 1);
294 backlight_enable(1);
295 break;
296 case FB_BLANK_VSYNC_SUSPEND:
297 case FB_BLANK_HSYNC_SUSPEND:
298 backlight_enable(0);
299 break;
300 case FB_BLANK_POWERDOWN:
301 backlight_enable(0);
302 lcd_enable(par, 0);
303 break;
304 default:
305 return -EINVAL;
306 }
307
308 /* let fbcon do a soft blank for us */
309 return (blank_mode == FB_BLANK_NORMAL) ? 1 : 0;
310}
311
312/* ------------------------------------------------------------------------- */
313
314/*
315 * We can't use the cfb generic routines, as we have to limit
316 * ourselves to 16-bit or 8-bit loads and stores to this 16-bit
317 * chip.
318 */
319
320static inline void epson1355fb_fb_writel(unsigned long v, unsigned long *a)
321{
322 u16 *p = (u16 *) a;
323 u16 l = v & 0xffff;
324 u16 h = v >> 16;
325
326 fb_writew(l, p);
327 fb_writew(h, p + 1);
328}
329
330static inline unsigned long epson1355fb_fb_readl(const unsigned long *a)
331{
332 const u16 *p = (u16 *) a;
333 u16 l = fb_readw(p);
334 u16 h = fb_readw(p + 1);
335
336 return (h << 16) | l;
337}
338
339#define FB_READL epson1355fb_fb_readl
340#define FB_WRITEL epson1355fb_fb_writel
341
342/* ------------------------------------------------------------------------- */
343
344static inline unsigned long copy_from_user16(void *to, const void *from,
345 unsigned long n)
346{
347 u16 *dst = (u16 *) to;
348 u16 *src = (u16 *) from;
349
350 if (!access_ok(VERIFY_READ, from, n))
351 return n;
352
353 while (n > 1) {
354 u16 v;
355 if (__get_user(v, src))
356 return n;
357
358 fb_writew(v, dst);
359
360 src++, dst++;
361 n -= 2;
362 }
363
364 if (n) {
365 u8 v;
366
367 if (__get_user(v, ((u8 *) src)))
368 return n;
369
370 fb_writeb(v, dst);
371 }
372 return 0;
373}
374
375static inline unsigned long copy_to_user16(void *to, const void *from,
376 unsigned long n)
377{
378 u16 *dst = (u16 *) to;
379 u16 *src = (u16 *) from;
380
381 if (!access_ok(VERIFY_WRITE, to, n))
382 return n;
383
384 while (n > 1) {
385 u16 v = fb_readw(src);
386
387 if (__put_user(v, dst))
388 return n;
389
390 src++, dst++;
391 n -= 2;
392 }
393
394 if (n) {
395 u8 v = fb_readb(src);
396
397 if (__put_user(v, ((u8 *) dst)))
398 return n;
399 }
400 return 0;
401}
402
403
404static ssize_t
405epson1355fb_read(struct file *file, char *buf, size_t count, loff_t * ppos)
406{
407 struct inode *inode = file->f_dentry->d_inode;
408 int fbidx = iminor(inode);
409 struct fb_info *info = registered_fb[fbidx];
410 unsigned long p = *ppos;
411
412 /* from fbmem.c except for our own copy_*_user */
413 if (!info || !info->screen_base)
414 return -ENODEV;
415
416 if (p >= info->fix.smem_len)
417 return 0;
418 if (count >= info->fix.smem_len)
419 count = info->fix.smem_len;
420 if (count + p > info->fix.smem_len)
421 count = info->fix.smem_len - p;
422
423 if (count) {
424 char *base_addr;
425
426 base_addr = info->screen_base;
427 count -= copy_to_user16(buf, base_addr + p, count);
428 if (!count)
429 return -EFAULT;
430 *ppos += count;
431 }
432 return count;
433}
434
435static ssize_t
436epson1355fb_write(struct file *file, const char *buf,
437 size_t count, loff_t * ppos)
438{
439 struct inode *inode = file->f_dentry->d_inode;
440 int fbidx = iminor(inode);
441 struct fb_info *info = registered_fb[fbidx];
442 unsigned long p = *ppos;
443 int err;
444
445 /* from fbmem.c except for our own copy_*_user */
446 if (!info || !info->screen_base)
447 return -ENODEV;
448
449 /* from fbmem.c except for our own copy_*_user */
450 if (p > info->fix.smem_len)
451 return -ENOSPC;
452 if (count >= info->fix.smem_len)
453 count = info->fix.smem_len;
454 err = 0;
455 if (count + p > info->fix.smem_len) {
456 count = info->fix.smem_len - p;
457 err = -ENOSPC;
458 }
459
460 if (count) {
461 char *base_addr;
462
463 base_addr = info->screen_base;
464 count -= copy_from_user16(base_addr + p, buf, count);
465 *ppos += count;
466 err = -EFAULT;
467 }
468 if (count)
469 return count;
470 return err;
471}
472
473/* ------------------------------------------------------------------------- */
474
475static struct fb_ops epson1355fb_fbops = {
476 .owner = THIS_MODULE,
477 .fb_setcolreg = epson1355fb_setcolreg,
478 .fb_pan_display = epson1355fb_pan_display,
479 .fb_blank = epson1355fb_blank,
480 .fb_fillrect = cfb_fillrect,
481 .fb_copyarea = cfb_copyarea,
482 .fb_imageblit = cfb_imageblit,
483 .fb_read = epson1355fb_read,
484 .fb_write = epson1355fb_write,
485 .fb_cursor = soft_cursor,
486};
487
488/* ------------------------------------------------------------------------- */
489
490static __init unsigned int get_fb_size(struct fb_info *info)
491{
492 unsigned int size = 2 * 1024 * 1024;
493 char *p = info->screen_base;
494
495 /* the 512k framebuffer is aliased at start + 0x80000 * n */
496 fb_writeb(1, p);
497 fb_writeb(0, p + 0x80000);
498 if (!fb_readb(p))
499 size = 512 * 1024;
500
501 fb_writeb(0, p);
502
503 return size;
504}
505
506static int epson1355_width_tab[2][4] __initdata =
507 { {4, 8, 16, -1}, {9, 12, 16, -1} };
508static int epson1355_bpp_tab[8] __initdata = { 1, 2, 4, 8, 15, 16 };
509
510static void __init fetch_hw_state(struct fb_info *info, struct epson1355_par *par)
511{
512 struct fb_var_screeninfo *var = &info->var;
513 struct fb_fix_screeninfo *fix = &info->fix;
514 u8 panel, display;
515 u16 offset;
516 u32 xres, yres;
517 u32 xres_virtual, yres_virtual;
518 int bpp, lcd_bpp;
519 int is_color, is_dual, is_tft;
520 int lcd_enabled, crt_enabled;
521
522 fix->type = FB_TYPE_PACKED_PIXELS;
523
524 display = epson1355_read_reg(par, REG_DISPLAY_MODE);
525 bpp = epson1355_bpp_tab[(display >> 2) & 7];
526
527 switch (bpp) {
528 case 8:
529 fix->visual = FB_VISUAL_PSEUDOCOLOR;
530 var->bits_per_pixel = 8;
531 var->red.offset = var->green.offset = var->blue.offset = 0;
532 var->red.length = var->green.length = var->blue.length = 8;
533 break;
534 case 16:
535 /* 5-6-5 RGB */
536 fix->visual = FB_VISUAL_TRUECOLOR;
537 var->bits_per_pixel = 16;
538 var->red.offset = 11;
539 var->red.length = 5;
540 var->green.offset = 5;
541 var->green.length = 6;
542 var->blue.offset = 0;
543 var->blue.length = 5;
544 break;
545 default:
546 BUG();
547 }
548 fb_alloc_cmap(&(info->cmap), 256, 0);
549
550 panel = epson1355_read_reg(par, REG_PANEL_TYPE);
551 is_color = (panel & 0x04) != 0;
552 is_dual = (panel & 0x02) != 0;
553 is_tft = (panel & 0x01) != 0;
554 crt_enabled = (display & 0x02) != 0;
555 lcd_enabled = (display & 0x01) != 0;
556 lcd_bpp = epson1355_width_tab[is_tft][(panel >> 4) & 3];
557
558 xres = (epson1355_read_reg(par, REG_HORZ_DISP_WIDTH) + 1) * 8;
559 yres = (epson1355_read_reg16(par, REG_VERT_DISP_HEIGHT0) + 1) *
560 ((is_dual && !crt_enabled) ? 2 : 1);
561 offset = epson1355_read_reg16(par, REG_MEM_ADDR_OFFSET0) & 0x7ff;
562 xres_virtual = offset * 16 / bpp;
563 yres_virtual = fix->smem_len / (offset * 2);
564
565 var->xres = xres;
566 var->yres = yres;
567 var->xres_virtual = xres_virtual;
568 var->yres_virtual = yres_virtual;
569 var->xoffset = var->yoffset = 0;
570
571 fix->line_length = offset * 2;
572
573 fix->xpanstep = 0; /* no pan yet */
574 fix->ypanstep = 1;
575 fix->ywrapstep = 0;
576 fix->accel = FB_ACCEL_NONE;
577
578 var->grayscale = !is_color;
579
580#ifdef DEBUG
581 printk(KERN_INFO
582 "epson1355fb: xres=%d, yres=%d, "
583 "is_color=%d, is_dual=%d, is_tft=%d\n",
584 xres, yres, is_color, is_dual, is_tft);
585 printk(KERN_INFO
586 "epson1355fb: bpp=%d, lcd_bpp=%d, "
587 "crt_enabled=%d, lcd_enabled=%d\n",
588 bpp, lcd_bpp, crt_enabled, lcd_enabled);
589#endif
590}
591
592
593static void clearfb16(struct fb_info *info)
594{
595 u16 *dst = (u16 *) info->screen_base;
596 unsigned long n = info->fix.smem_len;
597
598 while (n > 1) {
599 fb_writew(0, dst);
600 dst++, n -= 2;
601 }
602
603 if (n)
604 fb_writeb(0, dst);
605}
606
607static void epson1355fb_platform_release(struct device *device)
608{
609}
610
611static int epson1355fb_remove(struct device *device)
612{
613 struct fb_info *info = dev_get_drvdata(device);
614 struct epson1355_par *par = info->par;
615
616 backlight_enable(0);
617 if (par) {
618 lcd_enable(par, 0);
619 if (par && par->reg_addr)
620 iounmap((void *) par->reg_addr);
621 }
622
623 if (info) {
624 fb_dealloc_cmap(&info->cmap);
625 if (info->screen_base)
626 iounmap(info->screen_base);
627 framebuffer_release(info);
628 }
629 release_mem_region(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN);
630 release_mem_region(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN);
631 return 0;
632}
633
634int __init epson1355fb_probe(struct device *device)
635{
636 struct platform_device *dev = to_platform_device(device);
637 struct epson1355_par *default_par;
638 struct fb_info *info;
639 u8 revision;
640 int rc = 0;
641
642 if (!request_mem_region(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN, "S1D13505 registers")) {
643 printk(KERN_ERR "epson1355fb: unable to reserve "
644 "registers at 0x%0x\n", EPSON1355FB_REGS_PHYS);
645 rc = -EBUSY;
646 goto bail;
647 }
648
649 if (!request_mem_region(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN,
650 "S1D13505 framebuffer")) {
651 printk(KERN_ERR "epson1355fb: unable to reserve "
652 "framebuffer at 0x%0x\n", EPSON1355FB_FB_PHYS);
653 rc = -EBUSY;
654 goto bail;
655 }
656
657 info = framebuffer_alloc(sizeof(struct epson1355_par) + sizeof(u32) * 256, &dev->dev);
658 if (!info)
659 rc = -ENOMEM;
660 goto bail;
661
662 default_par = info->par;
663 default_par->reg_addr = (unsigned long) ioremap(EPSON1355FB_REGS_PHYS, EPSON1355FB_REGS_LEN);
664 if (!default_par->reg_addr) {
665 printk(KERN_ERR "epson1355fb: unable to map registers\n");
666 rc = -ENOMEM;
667 goto bail;
668 }
669 info->pseudo_palette = (void *)(default_par + 1);
670
671 info->screen_base = ioremap(EPSON1355FB_FB_PHYS, EPSON1355FB_FB_LEN);
672 if (!info->screen_base) {
673 printk(KERN_ERR "epson1355fb: unable to map framebuffer\n");
674 rc = -ENOMEM;
675 goto bail;
676 }
677
678 revision = epson1355_read_reg(default_par, REG_REVISION_CODE);
679 if ((revision >> 2) != 3) {
680 printk(KERN_INFO "epson1355fb: epson1355 not found\n");
681 rc = -ENODEV;
682 goto bail;
683 }
684
685 info->fix.mmio_start = EPSON1355FB_REGS_PHYS;
686 info->fix.mmio_len = EPSON1355FB_REGS_LEN;
687 info->fix.smem_start = EPSON1355FB_FB_PHYS;
688 info->fix.smem_len = get_fb_size(info);
689
690 printk(KERN_INFO "epson1355fb: regs mapped at 0x%lx, fb %d KiB mapped at 0x%p\n",
691 default_par->reg_addr, info->fix.smem_len / 1024, info->screen_base);
692
693 strcpy(info->fix.id, "S1D13505");
694 info->par = default_par;
695 info->fbops = &epson1355fb_fbops;
696 info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
697
698 /* we expect the boot loader to have initialized the chip
699 with appropriate parameters from which we can determinte
700 the flavor of lcd panel attached */
701 fetch_hw_state(info, default_par);
702
703 /* turn this puppy on ... */
704 clearfb16(info);
705 backlight_enable(1);
706 lcd_enable(default_par, 1);
707
708 if (register_framebuffer(info) < 0) {
709 rc = -EINVAL;
710 goto bail;
711 }
712 /*
713 * Our driver data.
714 */
715 dev_set_drvdata(&dev->dev, info);
716
717 printk(KERN_INFO "fb%d: %s frame buffer device\n",
718 info->node, info->fix.id);
719
720 return 0;
721
722 bail:
723 epson1355fb_remove(device);
724 return rc;
725}
726
727static struct device_driver epson1355fb_driver = {
728 .name = "epson1355fb",
729 .bus = &platform_bus_type,
730 .probe = epson1355fb_probe,
731 .remove = epson1355fb_remove,
732};
733
734static struct platform_device epson1355fb_device = {
735 .name = "epson1355fb",
736 .id = 0,
737 .dev = {
738 .release = epson1355fb_platform_release,
739 }
740};
741
742int __init epson1355fb_init(void)
743{
744 int ret = 0;
745
746 if (fb_get_options("epson1355fb", NULL))
747 return -ENODEV;
748
749 ret = driver_register(&epson1355fb_driver);
750 if (!ret) {
751 ret = platform_device_register(&epson1355fb_device);
752 if (ret)
753 driver_unregister(&epson1355fb_driver);
754 }
755 return ret;
756}
757
758module_init(epson1355fb_init);
759
760#ifdef MODULE
761static void __exit epson1355fb_exit(void)
762{
763 platform_device_unregister(&epson1355fb_device);
764 driver_unregister(&epson1355fb_driver);
765}
766
767/* ------------------------------------------------------------------------- */
768
769module_exit(epson1355fb_exit);
770#endif
771
772MODULE_AUTHOR("Christopher Hoover <ch@hpl.hp.com>");
773MODULE_DESCRIPTION("Framebuffer driver for Epson S1D13505");
774MODULE_LICENSE("GPL");