blob: 836a612af977f167e67ff1a0f92fe4708bc6788d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/drivers/video/skeletonfb.c -- Skeleton for a frame buffer device
3 *
4 * Modified to new api Jan 2001 by James Simmons (jsimmons@transvirtual.com)
5 *
6 * Created 28 Dec 1997 by Geert Uytterhoeven
7 *
8 *
9 * I have started rewriting this driver as a example of the upcoming new API
10 * The primary goal is to remove the console code from fbdev and place it
11 * into fbcon.c. This reduces the code and makes writing a new fbdev driver
12 * easy since the author doesn't need to worry about console internals. It
13 * also allows the ability to run fbdev without a console/tty system on top
14 * of it.
15 *
16 * First the roles of struct fb_info and struct display have changed. Struct
Michael Opdenacker59c51592007-05-09 08:57:56 +020017 * display will go away. The way the new framebuffer console code will
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 * work is that it will act to translate data about the tty/console in
19 * struct vc_data to data in a device independent way in struct fb_info. Then
20 * various functions in struct fb_ops will be called to store the device
21 * dependent state in the par field in struct fb_info and to change the
22 * hardware to that state. This allows a very clean separation of the fbdev
23 * layer from the console layer. It also allows one to use fbdev on its own
24 * which is a bounus for embedded devices. The reason this approach works is
25 * for each framebuffer device when used as a tty/console device is allocated
26 * a set of virtual terminals to it. Only one virtual terminal can be active
27 * per framebuffer device. We already have all the data we need in struct
28 * vc_data so why store a bunch of colormaps and other fbdev specific data
29 * per virtual terminal.
30 *
31 * As you can see doing this makes the con parameter pretty much useless
32 * for struct fb_ops functions, as it should be. Also having struct
33 * fb_var_screeninfo and other data in fb_info pretty much eliminates the
34 * need for get_fix and get_var. Once all drivers use the fix, var, and cmap
35 * fbcon can be written around these fields. This will also eliminate the
36 * need to regenerate struct fb_var_screeninfo, struct fb_fix_screeninfo
37 * struct fb_cmap every time get_var, get_fix, get_cmap functions are called
38 * as many drivers do now.
39 *
40 * This file is subject to the terms and conditions of the GNU General Public
41 * License. See the file COPYING in the main directory of this archive for
42 * more details.
43 */
44
45#include <linux/module.h>
46#include <linux/kernel.h>
47#include <linux/errno.h>
48#include <linux/string.h>
49#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/slab.h>
51#include <linux/delay.h>
52#include <linux/fb.h>
53#include <linux/init.h>
Krzysztof Helt36cc5352007-05-08 00:38:25 -070054#include <linux/pci.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56 /*
57 * This is just simple sample code.
58 *
59 * No warranty that it actually compiles.
60 * Even less warranty that it actually works :-)
61 */
62
63/*
Krzysztof Helt36cc5352007-05-08 00:38:25 -070064 * Driver data
65 */
66static char *mode_option __devinitdata;
67
68/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 * If your driver supports multiple boards, you should make the
70 * below data types arrays, or allocate them dynamically (using kmalloc()).
71 */
72
73/*
74 * This structure defines the hardware state of the graphics card. Normally
75 * you place this in a header file in linux/include/video. This file usually
76 * also includes register information. That allows other driver subsystems
77 * and userland applications the ability to use the same header file to
78 * avoid duplicate work and easy porting of software.
79 */
80struct xxx_par;
81
82/*
83 * Here we define the default structs fb_fix_screeninfo and fb_var_screeninfo
84 * if we don't use modedb. If we do use modedb see xxxfb_init how to use it
85 * to get a fb_var_screeninfo. Otherwise define a default var as well.
86 */
Krzysztof Helt19c1a8b2007-05-08 00:40:14 -070087static struct fb_fix_screeninfo xxxfb_fix __devinitdata = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 .id = "FB's name",
89 .type = FB_TYPE_PACKED_PIXELS,
90 .visual = FB_VISUAL_PSEUDOCOLOR,
91 .xpanstep = 1,
92 .ypanstep = 1,
93 .ywrapstep = 1,
94 .accel = FB_ACCEL_NONE,
95};
96
97 /*
98 * Modern graphical hardware not only supports pipelines but some
99 * also support multiple monitors where each display can have its
100 * its own unique data. In this case each display could be
101 * represented by a separate framebuffer device thus a separate
102 * struct fb_info. Now the struct xxx_par represents the graphics
103 * hardware state thus only one exist per card. In this case the
104 * struct xxx_par for each graphics card would be shared between
105 * every struct fb_info that represents a framebuffer on that card.
106 * This allows when one display changes it video resolution (info->var)
107 * the other displays know instantly. Each display can always be
108 * aware of the entire hardware state that affects it because they share
109 * the same xxx_par struct. The other side of the coin is multiple
110 * graphics cards that pass data around until it is finally displayed
111 * on one monitor. Such examples are the voodoo 1 cards and high end
112 * NUMA graphics servers. For this case we have a bunch of pars, each
113 * one that represents a graphics state, that belong to one struct
114 * fb_info. Their you would want to have *par point to a array of device
115 * states and have each struct fb_ops function deal with all those
116 * states. I hope this covers every possible hardware design. If not
117 * feel free to send your ideas at jsimmons@users.sf.net
118 */
119
120 /*
121 * If your driver supports multiple boards or it supports multiple
122 * framebuffers, you should make these arrays, or allocate them
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800123 * dynamically using framebuffer_alloc() and free them with
124 * framebuffer_release().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 */
126static struct fb_info info;
127
128 /*
129 * Each one represents the state of the hardware. Most hardware have
130 * just one hardware state. These here represent the default state(s).
131 */
132static struct xxx_par __initdata current_par;
133
134int xxxfb_init(void);
135int xxxfb_setup(char*);
136
137/**
138 * xxxfb_open - Optional function. Called when the framebuffer is
139 * first accessed.
140 * @info: frame buffer structure that represents a single frame buffer
141 * @user: tell us if the userland (value=1) or the console is accessing
142 * the framebuffer.
143 *
144 * This function is the first function called in the framebuffer api.
145 * Usually you don't need to provide this function. The case where it
146 * is used is to change from a text mode hardware state to a graphics
147 * mode state.
148 *
149 * Returns negative errno on error, or zero on success.
150 */
Krzysztof Helt4c7bf382007-05-08 00:40:10 -0700151static int xxxfb_open(struct fb_info *info, int user)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
153 return 0;
154}
155
156/**
157 * xxxfb_release - Optional function. Called when the framebuffer
158 * device is closed.
159 * @info: frame buffer structure that represents a single frame buffer
160 * @user: tell us if the userland (value=1) or the console is accessing
161 * the framebuffer.
162 *
163 * Thus function is called when we close /dev/fb or the framebuffer
164 * console system is released. Usually you don't need this function.
165 * The case where it is usually used is to go from a graphics state
166 * to a text mode state.
167 *
168 * Returns negative errno on error, or zero on success.
169 */
Krzysztof Helt4c7bf382007-05-08 00:40:10 -0700170static int xxxfb_release(struct fb_info *info, int user)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171{
172 return 0;
173}
174
175/**
176 * xxxfb_check_var - Optional function. Validates a var passed in.
177 * @var: frame buffer variable screen structure
178 * @info: frame buffer structure that represents a single frame buffer
179 *
180 * Checks to see if the hardware supports the state requested by
181 * var passed in. This function does not alter the hardware state!!!
182 * This means the data stored in struct fb_info and struct xxx_par do
183 * not change. This includes the var inside of struct fb_info.
184 * Do NOT change these. This function can be called on its own if we
185 * intent to only test a mode and not actually set it. The stuff in
186 * modedb.c is a example of this. If the var passed in is slightly
187 * off by what the hardware can support then we alter the var PASSED in
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800188 * to what we can do.
189 *
190 * For values that are off, this function must round them _up_ to the
191 * next value that is supported by the hardware. If the value is
192 * greater than the highest value supported by the hardware, then this
193 * function must return -EINVAL.
194 *
195 * Exception to the above rule: Some drivers have a fixed mode, ie,
196 * the hardware is already set at boot up, and cannot be changed. In
197 * this case, it is more acceptable that this function just return
198 * a copy of the currently working var (info->var). Better is to not
199 * implement this function, as the upper layer will do the copying
200 * of the current var for you.
201 *
202 * Note: This is the only function where the contents of var can be
203 * freely adjusted after the driver has been registered. If you find
204 * that you have code outside of this function that alters the content
205 * of var, then you are doing something wrong. Note also that the
206 * contents of info->var must be left untouched at all times after
207 * driver registration.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 *
209 * Returns negative errno on error, or zero on success.
210 */
211static int xxxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
212{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 /* ... */
214 return 0;
215}
216
217/**
218 * xxxfb_set_par - Optional function. Alters the hardware state.
219 * @info: frame buffer structure that represents a single frame buffer
220 *
221 * Using the fb_var_screeninfo in fb_info we set the resolution of the
222 * this particular framebuffer. This function alters the par AND the
223 * fb_fix_screeninfo stored in fb_info. It doesn't not alter var in
224 * fb_info since we are using that data. This means we depend on the
225 * data in var inside fb_info to be supported by the hardware.
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800226 *
227 * This function is also used to recover/restore the hardware to a
228 * known working state.
229 *
230 * xxxfb_check_var is always called before xxxfb_set_par to ensure that
231 * the contents of var is always valid.
232 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 * Again if you can't change the resolution you don't need this function.
234 *
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800235 * However, even if your hardware does not support mode changing,
236 * a set_par might be needed to at least initialize the hardware to
237 * a known working state, especially if it came back from another
238 * process that also modifies the same hardware, such as X.
239 *
240 * If this is the case, a combination such as the following should work:
241 *
242 * static int xxxfb_check_var(struct fb_var_screeninfo *var,
243 * struct fb_info *info)
244 * {
245 * *var = info->var;
246 * return 0;
247 * }
248 *
249 * static int xxxfb_set_par(struct fb_info *info)
250 * {
251 * init your hardware here
252 * }
253 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 * Returns negative errno on error, or zero on success.
255 */
256static int xxxfb_set_par(struct fb_info *info)
257{
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800258 struct xxx_par *par = info->par;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 /* ... */
260 return 0;
261}
262
263/**
264 * xxxfb_setcolreg - Optional function. Sets a color register.
265 * @regno: Which register in the CLUT we are programming
266 * @red: The red value which can be up to 16 bits wide
267 * @green: The green value which can be up to 16 bits wide
268 * @blue: The blue value which can be up to 16 bits wide.
269 * @transp: If supported, the alpha value which can be up to 16 bits wide.
270 * @info: frame buffer info structure
271 *
272 * Set a single color register. The values supplied have a 16 bit
273 * magnitude which needs to be scaled in this function for the hardware.
274 * Things to take into consideration are how many color registers, if
275 * any, are supported with the current color visual. With truecolor mode
276 * no color palettes are supported. Here a pseudo palette is created
277 * which we store the value in pseudo_palette in struct fb_info. For
278 * pseudocolor mode we have a limited color palette. To deal with this
279 * we can program what color is displayed for a particular pixel value.
280 * DirectColor is similar in that we can program each color field. If
281 * we have a static colormap we don't need to implement this function.
282 *
283 * Returns negative errno on error, or zero on success.
284 */
285static int xxxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
286 unsigned blue, unsigned transp,
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700287 struct fb_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
289 if (regno >= 256) /* no. of hw registers */
290 return -EINVAL;
291 /*
292 * Program hardware... do anything you want with transp
293 */
294
295 /* grayscale works only partially under directcolor */
296 if (info->var.grayscale) {
297 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
298 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
299 }
300
301 /* Directcolor:
302 * var->{color}.offset contains start of bitfield
303 * var->{color}.length contains length of bitfield
304 * {hardwarespecific} contains width of DAC
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800305 * pseudo_palette[X] is programmed to (X << red.offset) |
306 * (X << green.offset) |
307 * (X << blue.offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 * RAMDAC[X] is programmed to (red, green, blue)
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800309 * color depth = SUM(var->{color}.length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 *
311 * Pseudocolor:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 * var->{color}.offset is 0
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800313 * var->{color}.length contains width of DAC or the number of unique
314 * colors available (color depth)
315 * pseudo_palette is not used
316 * RAMDAC[X] is programmed to (red, green, blue)
317 * color depth = var->{color}.length
318 *
319 * Static pseudocolor:
320 * same as Pseudocolor, but the RAMDAC is not programmed (read-only)
321 *
322 * Mono01/Mono10:
323 * Has only 2 values, black on white or white on black (fg on bg),
324 * var->{color}.offset is 0
325 * white = (1 << var->{color}.length) - 1, black = 0
326 * pseudo_palette is not used
327 * RAMDAC does not exist
328 * color depth is always 2
329 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 * Truecolor:
331 * does not use RAMDAC (usually has 3 of them).
332 * var->{color}.offset contains start of bitfield
333 * var->{color}.length contains length of bitfield
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800334 * pseudo_palette is programmed to (red << red.offset) |
335 * (green << green.offset) |
336 * (blue << blue.offset) |
337 * (transp << transp.offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 * RAMDAC does not exist
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800339 * color depth = SUM(var->{color}.length})
340 *
341 * The color depth is used by fbcon for choosing the logo and also
342 * for color palette transformation if color depth < 4
343 *
344 * As can be seen from the above, the field bits_per_pixel is _NOT_
345 * a criteria for describing the color visual.
346 *
347 * A common mistake is assuming that bits_per_pixel <= 8 is pseudocolor,
348 * and higher than that, true/directcolor. This is incorrect, one needs
349 * to look at the fix->visual.
350 *
351 * Another common mistake is using bits_per_pixel to calculate the color
352 * depth. The bits_per_pixel field does not directly translate to color
353 * depth. You have to compute for the color depth (using the color
354 * bitfields) and fix->visual as seen above.
355 */
356
357 /*
358 * This is the point where the color is converted to something that
359 * is acceptable by the hardware.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 */
361#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800362 red = CNVT_TOHW(red, info->var.red.length);
363 green = CNVT_TOHW(green, info->var.green.length);
364 blue = CNVT_TOHW(blue, info->var.blue.length);
365 transp = CNVT_TOHW(transp, info->var.transp.length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366#undef CNVT_TOHW
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800367 /*
368 * This is the point where the function feeds the color to the hardware
369 * palette after converting the colors to something acceptable by
370 * the hardware. Note, only FB_VISUAL_DIRECTCOLOR and
371 * FB_VISUAL_PSEUDOCOLOR visuals need to write to the hardware palette.
372 * If you have code that writes to the hardware CLUT, and it's not
373 * any of the above visuals, then you are doing something wrong.
374 */
375 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR ||
376 info->fix.visual == FB_VISUAL_TRUECOLOR)
377 write_{red|green|blue|transp}_to_clut();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800379 /* This is the point were you need to fill up the contents of
380 * info->pseudo_palette. This structure is used _only_ by fbcon, thus
381 * it only contains 16 entries to match the number of colors supported
382 * by the console. The pseudo_palette is used only if the visual is
383 * in directcolor or truecolor mode. With other visuals, the
384 * pseudo_palette is not used. (This might change in the future.)
385 *
386 * The contents of the pseudo_palette is in raw pixel format. Ie, each
387 * entry can be written directly to the framebuffer without any conversion.
388 * The pseudo_palette is (void *). However, if using the generic
389 * drawing functions (cfb_imageblit, cfb_fillrect), the pseudo_palette
390 * must be casted to (u32 *) _regardless_ of the bits per pixel. If the
391 * driver is using its own drawing functions, then it can use whatever
392 * size it wants.
393 */
394 if (info->fix.visual == FB_VISUAL_TRUECOLOR ||
395 info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
396 u32 v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800398 if (regno >= 16)
399 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800401 v = (red << info->var.red.offset) |
402 (green << info->var.green.offset) |
403 (blue << info->var.blue.offset) |
404 (transp << info->var.transp.offset);
405
406 ((u32*)(info->pseudo_palette))[regno] = v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 }
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800408
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 /* ... */
410 return 0;
411}
412
413/**
414 * xxxfb_pan_display - NOT a required function. Pans the display.
415 * @var: frame buffer variable screen structure
416 * @info: frame buffer structure that represents a single frame buffer
417 *
418 * Pan (or wrap, depending on the `vmode' field) the display using the
419 * `xoffset' and `yoffset' fields of the `var' structure.
420 * If the values don't fit, return -EINVAL.
421 *
422 * Returns negative errno on error, or zero on success.
423 */
424static int xxxfb_pan_display(struct fb_var_screeninfo *var,
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700425 struct fb_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426{
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800427 /*
428 * If your hardware does not support panning, _do_ _not_ implement this
429 * function. Creating a dummy function will just confuse user apps.
430 */
431
432 /*
433 * Note that even if this function is fully functional, a setting of
434 * 0 in both xpanstep and ypanstep means that this function will never
435 * get called.
436 */
437
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 /* ... */
439 return 0;
440}
441
442/**
443 * xxxfb_blank - NOT a required function. Blanks the display.
444 * @blank_mode: the blank mode we want.
445 * @info: frame buffer structure that represents a single frame buffer
446 *
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800447 * Blank the screen if blank_mode != FB_BLANK_UNBLANK, else unblank.
448 * Return 0 if blanking succeeded, != 0 if un-/blanking failed due to
449 * e.g. a video mode which doesn't support it.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 *
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800451 * Implements VESA suspend and powerdown modes on hardware that supports
452 * disabling hsync/vsync:
453 *
454 * FB_BLANK_NORMAL = display is blanked, syncs are on.
455 * FB_BLANK_HSYNC_SUSPEND = hsync off
456 * FB_BLANK_VSYNC_SUSPEND = vsync off
457 * FB_BLANK_POWERDOWN = hsync and vsync off
458 *
459 * If implementing this function, at least support FB_BLANK_UNBLANK.
460 * Return !0 for any modes that are unimplemented.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 *
462 */
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700463static int xxxfb_blank(int blank_mode, struct fb_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464{
465 /* ... */
466 return 0;
467}
468
469/* ------------ Accelerated Functions --------------------- */
470
471/*
472 * We provide our own functions if we have hardware acceleration
473 * or non packed pixel format layouts. If we have no hardware
474 * acceleration, we can use a generic unaccelerated function. If using
475 * a pack pixel format just use the functions in cfb_*.c. Each file
476 * has one of the three different accel functions we support.
477 */
478
479/**
480 * xxxfb_fillrect - REQUIRED function. Can use generic routines if
481 * non acclerated hardware and packed pixel based.
482 * Draws a rectangle on the screen.
483 *
484 * @info: frame buffer structure that represents a single frame buffer
485 * @region: The structure representing the rectangular region we
486 * wish to draw to.
487 *
488 * This drawing operation places/removes a retangle on the screen
489 * depending on the rastering operation with the value of color which
490 * is in the current color depth format.
491 */
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700492void xxxfb_fillrect(struct fb_info *p, const struct fb_fillrect *region)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493{
494/* Meaning of struct fb_fillrect
495 *
496 * @dx: The x and y corrdinates of the upper left hand corner of the
497 * @dy: area we want to draw to.
498 * @width: How wide the rectangle is we want to draw.
499 * @height: How tall the rectangle is we want to draw.
500 * @color: The color to fill in the rectangle with.
501 * @rop: The raster operation. We can draw the rectangle with a COPY
502 * of XOR which provides erasing effect.
503 */
504}
505
506/**
507 * xxxfb_copyarea - REQUIRED function. Can use generic routines if
508 * non acclerated hardware and packed pixel based.
509 * Copies one area of the screen to another area.
510 *
511 * @info: frame buffer structure that represents a single frame buffer
512 * @area: Structure providing the data to copy the framebuffer contents
513 * from one region to another.
514 *
515 * This drawing operation copies a rectangular area from one area of the
516 * screen to another area.
517 */
518void xxxfb_copyarea(struct fb_info *p, const struct fb_copyarea *area)
519{
520/*
521 * @dx: The x and y coordinates of the upper left hand corner of the
522 * @dy: destination area on the screen.
523 * @width: How wide the rectangle is we want to copy.
524 * @height: How tall the rectangle is we want to copy.
525 * @sx: The x and y coordinates of the upper left hand corner of the
526 * @sy: source area on the screen.
527 */
528}
529
530
531/**
532 * xxxfb_imageblit - REQUIRED function. Can use generic routines if
533 * non acclerated hardware and packed pixel based.
534 * Copies a image from system memory to the screen.
535 *
536 * @info: frame buffer structure that represents a single frame buffer
537 * @image: structure defining the image.
538 *
539 * This drawing operation draws a image on the screen. It can be a
540 * mono image (needed for font handling) or a color image (needed for
541 * tux).
542 */
543void xxxfb_imageblit(struct fb_info *p, const struct fb_image *image)
544{
545/*
546 * @dx: The x and y coordinates of the upper left hand corner of the
547 * @dy: destination area to place the image on the screen.
548 * @width: How wide the image is we want to copy.
549 * @height: How tall the image is we want to copy.
550 * @fg_color: For mono bitmap images this is color data for
551 * @bg_color: the foreground and background of the image to
552 * write directly to the frmaebuffer.
553 * @depth: How many bits represent a single pixel for this image.
554 * @data: The actual data used to construct the image on the display.
555 * @cmap: The colormap used for color images.
556 */
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800557
558/*
559 * The generic function, cfb_imageblit, expects that the bitmap scanlines are
560 * padded to the next byte. Most hardware accelerators may require padding to
561 * the next u16 or the next u32. If that is the case, the driver can specify
562 * this by setting info->pixmap.scan_align = 2 or 4. See a more
563 * comprehensive description of the pixmap below.
564 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565}
566
567/**
Antonino A. Daplasc465e052005-11-07 01:00:35 -0800568 * xxxfb_cursor - OPTIONAL. If your hardware lacks support
569 * for a cursor, leave this field NULL.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 *
571 * @info: frame buffer structure that represents a single frame buffer
572 * @cursor: structure defining the cursor to draw.
573 *
574 * This operation is used to set or alter the properities of the
575 * cursor.
576 *
577 * Returns negative errno on error, or zero on success.
578 */
579int xxxfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
580{
581/*
582 * @set: Which fields we are altering in struct fb_cursor
583 * @enable: Disable or enable the cursor
584 * @rop: The bit operation we want to do.
585 * @mask: This is the cursor mask bitmap.
586 * @dest: A image of the area we are going to display the cursor.
587 * Used internally by the driver.
588 * @hot: The hot spot.
589 * @image: The actual data for the cursor image.
590 *
591 * NOTES ON FLAGS (cursor->set):
592 *
593 * FB_CUR_SETIMAGE - the cursor image has changed (cursor->image.data)
594 * FB_CUR_SETPOS - the cursor position has changed (cursor->image.dx|dy)
595 * FB_CUR_SETHOT - the cursor hot spot has changed (cursor->hot.dx|dy)
596 * FB_CUR_SETCMAP - the cursor colors has changed (cursor->fg_color|bg_color)
597 * FB_CUR_SETSHAPE - the cursor bitmask has changed (cursor->mask)
598 * FB_CUR_SETSIZE - the cursor size has changed (cursor->width|height)
599 * FB_CUR_SETALL - everything has changed
600 *
601 * NOTES ON ROPs (cursor->rop, Raster Operation)
602 *
603 * ROP_XOR - cursor->image.data XOR cursor->mask
604 * ROP_COPY - curosr->image.data AND cursor->mask
605 *
606 * OTHER NOTES:
607 *
608 * - fbcon only supports a 2-color cursor (cursor->image.depth = 1)
609 * - The fb_cursor structure, @cursor, _will_ always contain valid
610 * fields, whether any particular bitfields in cursor->set is set
611 * or not.
612 */
613}
614
615/**
616 * xxxfb_rotate - NOT a required function. If your hardware
617 * supports rotation the whole screen then
618 * you would provide a hook for this.
619 *
620 * @info: frame buffer structure that represents a single frame buffer
621 * @angle: The angle we rotate the screen.
622 *
623 * This operation is used to set or alter the properities of the
624 * cursor.
625 */
626void xxxfb_rotate(struct fb_info *info, int angle)
627{
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800628/* Will be deprecated */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629}
630
631/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 * xxxfb_sync - NOT a required function. Normally the accel engine
633 * for a graphics card take a specific amount of time.
634 * Often we have to wait for the accelerator to finish
635 * its operation before we can write to the framebuffer
636 * so we can have consistent display output.
637 *
638 * @info: frame buffer structure that represents a single frame buffer
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800639 *
640 * If the driver has implemented its own hardware-based drawing function,
641 * implementing this function is highly recommended.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 */
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700643int xxxfb_sync(struct fb_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644{
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700645 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646}
647
648 /*
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700649 * Frame buffer operations
650 */
651
652static struct fb_ops xxxfb_ops = {
653 .owner = THIS_MODULE,
654 .fb_open = xxxfb_open,
655 .fb_read = xxxfb_read,
656 .fb_write = xxxfb_write,
657 .fb_release = xxxfb_release,
658 .fb_check_var = xxxfb_check_var,
659 .fb_set_par = xxxfb_set_par,
660 .fb_setcolreg = xxxfb_setcolreg,
661 .fb_blank = xxxfb_blank,
662 .fb_pan_display = xxxfb_pan_display,
663 .fb_fillrect = xxxfb_fillrect, /* Needed !!! */
664 .fb_copyarea = xxxfb_copyarea, /* Needed !!! */
665 .fb_imageblit = xxxfb_imageblit, /* Needed !!! */
666 .fb_cursor = xxxfb_cursor, /* Optional !!! */
667 .fb_rotate = xxxfb_rotate,
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700668 .fb_sync = xxxfb_sync,
669 .fb_ioctl = xxxfb_ioctl,
670 .fb_mmap = xxxfb_mmap,
671};
672
673/* ------------------------------------------------------------------------- */
674
675 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 * Initialization
677 */
678
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800679/* static int __init xxfb_probe (struct device *device) -- for platform devs */
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700680static int __devinit xxxfb_probe(struct pci_dev *dev,
Krzysztof Helt4c7bf382007-05-08 00:40:10 -0700681 const struct pci_device_id *ent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682{
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800683 struct fb_info *info;
684 struct xxx_par *par;
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700685 struct device* device = &dev->dev; /* for pci drivers */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 int cmap_len, retval;
687
688 /*
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800689 * Dynamically allocate info and par
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 */
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800691 info = framebuffer_alloc(sizeof(struct xxx_par), device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800693 if (!info) {
694 /* goto error path */
695 }
696
697 par = info->par;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
699 /*
700 * Here we set the screen_base to the virtual memory address
701 * for the framebuffer. Usually we obtain the resource address
702 * from the bus layer and then translate it to virtual memory
703 * space via ioremap. Consult ioport.h.
704 */
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800705 info->screen_base = framebuffer_virtual_memory;
706 info->fbops = &xxxfb_ops;
707 info->fix = xxxfb_fix; /* this will be the only time xxxfb_fix will be
Krzysztof Helt19c1a8b2007-05-08 00:40:14 -0700708 * used, so mark it as __devinitdata
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800709 */
710 info->pseudo_palette = pseudo_palette; /* The pseudopalette is an
711 * 16-member array
712 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 /*
714 * Set up flags to indicate what sort of acceleration your
715 * driver can provide (pan/wrap/copyarea/etc.) and whether it
716 * is a module -- see FBINFO_* in include/linux/fb.h
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800717 *
718 * If your hardware can support any of the hardware accelerated functions
719 * fbcon performance will improve if info->flags is set properly.
720 *
721 * FBINFO_HWACCEL_COPYAREA - hardware moves
722 * FBINFO_HWACCEL_FILLRECT - hardware fills
723 * FBINFO_HWACCEL_IMAGEBLIT - hardware mono->color expansion
724 * FBINFO_HWACCEL_YPAN - hardware can pan display in y-axis
725 * FBINFO_HWACCEL_YWRAP - hardware can wrap display in y-axis
726 * FBINFO_HWACCEL_DISABLED - supports hardware accels, but disabled
727 * FBINFO_READS_FAST - if set, prefer moves over mono->color expansion
728 * FBINFO_MISC_TILEBLITTING - hardware can do tile blits
729 *
730 * NOTE: These are for fbcon use only.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 */
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800732 info->flags = FBINFO_DEFAULT;
733
734/********************* This stage is optional ******************************/
735 /*
736 * The struct pixmap is a scratch pad for the drawing functions. This
737 * is where the monochrome bitmap is constructed by the higher layers
738 * and then passed to the accelerator. For drivers that uses
739 * cfb_imageblit, you can skip this part. For those that have a more
740 * rigorous requirement, this stage is needed
741 */
742
743 /* PIXMAP_SIZE should be small enough to optimize drawing, but not
744 * large enough that memory is wasted. A safe size is
745 * (max_xres * max_font_height/8). max_xres is driver dependent,
746 * max_font_height is 32.
747 */
748 info->pixmap.addr = kmalloc(PIXMAP_SIZE, GFP_KERNEL);
749 if (!info->pixmap.addr) {
750 /* goto error */
751 }
752
753 info->pixmap.size = PIXMAP_SIZE;
754
755 /*
756 * FB_PIXMAP_SYSTEM - memory is in system ram
757 * FB_PIXMAP_IO - memory is iomapped
758 * FB_PIXMAP_SYNC - if set, will call fb_sync() per access to pixmap,
759 * usually if FB_PIXMAP_IO is set.
760 *
761 * Currently, FB_PIXMAP_IO is unimplemented.
762 */
763 info->pixmap.flags = FB_PIXMAP_SYSTEM;
764
765 /*
766 * scan_align is the number of padding for each scanline. It is in bytes.
767 * Thus for accelerators that need padding to the next u32, put 4 here.
768 */
769 info->pixmap.scan_align = 4;
770
771 /*
772 * buf_align is the amount to be padded for the buffer. For example,
773 * the i810fb needs a scan_align of 2 but expects it to be fed with
774 * dwords, so a buf_align = 4 is required.
775 */
776 info->pixmap.buf_align = 4;
777
778 /* access_align is how many bits can be accessed from the framebuffer
779 * ie. some epson cards allow 16-bit access only. Most drivers will
780 * be safe with u32 here.
781 *
782 * NOTE: This field is currently unused.
783 */
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700784 info->pixmap.scan_align = 32;
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800785/***************************** End optional stage ***************************/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
787 /*
788 * This should give a reasonable default video mode. The following is
789 * done when we can set a video mode.
790 */
791 if (!mode_option)
792 mode_option = "640x480@60";
793
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700794 retval = fb_find_mode(&info->var, info, mode_option, NULL, 0, NULL, 8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795
796 if (!retval || retval == 4)
797 return -EINVAL;
798
799 /* This has to been done !!! */
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700800 fb_alloc_cmap(&info->cmap, cmap_len, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801
802 /*
803 * The following is done in the case of having hardware with a static
804 * mode. If we are setting the mode ourselves we don't call this.
805 */
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800806 info->var = xxxfb_var;
807
808 /*
809 * For drivers that can...
810 */
811 xxxfb_check_var(&info->var, info);
812
813 /*
814 * Does a call to fb_set_par() before register_framebuffer needed? This
815 * will depend on you and the hardware. If you are sure that your driver
816 * is the only device in the system, a call to fb_set_par() is safe.
817 *
818 * Hardware in x86 systems has a VGA core. Calling set_par() at this
819 * point will corrupt the VGA console, so it might be safer to skip a
820 * call to set_par here and just allow fbcon to do it for you.
821 */
822 /* xxxfb_set_par(info); */
823
824 if (register_framebuffer(info) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 return -EINVAL;
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800826 printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
827 info->fix.id);
828 pci_set_drvdata(dev, info); /* or dev_set_drvdata(device, info) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 return 0;
830}
831
832 /*
833 * Cleanup
834 */
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700835/* static void __devexit xxxfb_remove(struct device *device) */
836static void __devexit xxxfb_remove(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837{
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700838 struct fb_info *info = pci_get_drvdata(dev);
839 /* or dev_get_drvdata(device); */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800841 if (info) {
842 unregister_framebuffer(info);
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700843 fb_dealloc_cmap(&info->cmap);
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800844 /* ... */
845 framebuffer_release(info);
846 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847}
848
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700849#ifdef CONFIG_PCI
850#ifdef CONFIG_PM
851/**
852 * xxxfb_suspend - Optional but recommended function. Suspend the device.
853 * @dev: PCI device
854 * @msg: the suspend event code.
855 *
856 * See Documentation/power/devices.txt for more information
857 */
858static int xxxfb_suspend(struct pci_dev *dev, pm_message_t msg)
859{
860 struct fb_info *info = pci_get_drvdata(dev);
861 struct xxxfb_par *par = info->par;
862
863 /* suspend here */
864 return 0;
865}
866
867/**
868 * xxxfb_resume - Optional but recommended function. Resume the device.
869 * @dev: PCI device
870 *
871 * See Documentation/power/devices.txt for more information
872 */
873static int xxxfb_resume(struct pci_dev *dev)
874{
875 struct fb_info *info = pci_get_drvdata(dev);
876 struct xxxfb_par *par = info->par;
877
878 /* resume here */
879 return 0;
880}
881#else
882#define xxxfb_suspend NULL
883#define xxxfb_resume NULL
884#endif /* CONFIG_PM */
885
886static struct pci_device_id xxxfb_id_table[] = {
887 { PCI_VENDOR_ID_XXX, PCI_DEVICE_ID_XXX,
888 PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY << 16,
Krzysztof Helt4c7bf382007-05-08 00:40:10 -0700889 PCI_CLASS_MASK, 0 },
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700890 { 0, }
891};
892
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800893/* For PCI drivers */
894static struct pci_driver xxxfb_driver = {
895 .name = "xxxfb",
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700896 .id_table = xxxfb_id_table,
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800897 .probe = xxxfb_probe,
898 .remove = __devexit_p(xxxfb_remove),
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700899 .suspend = xxxfb_suspend, /* optional but recommended */
900 .resume = xxxfb_resume, /* optional but recommended */
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800901};
902
Krzysztof Helt19c1a8b2007-05-08 00:40:14 -0700903MODULE_DEVICE_TABLE(pci, xxxfb_id_table);
904
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700905int __init xxxfb_init(void)
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800906{
907 /*
908 * For kernel boot options (in 'video=xxxfb:<options>' format)
909 */
910#ifndef MODULE
911 char *option = NULL;
912
913 if (fb_get_options("xxxfb", &option))
914 return -ENODEV;
915 xxxfb_setup(option);
916#endif
917
918 return pci_register_driver(&xxxfb_driver);
919}
920
921static void __exit xxxfb_exit(void)
922{
923 pci_unregister_driver(&xxxfb_driver);
924}
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700925#else /* non PCI, platform drivers */
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800926#include <linux/platform_device.h>
927/* for platform devices */
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700928
929#ifdef CONFIG_PM
930/**
931 * xxxfb_suspend - Optional but recommended function. Suspend the device.
932 * @dev: platform device
933 * @msg: the suspend event code.
934 *
935 * See Documentation/power/devices.txt for more information
936 */
937static int xxxfb_suspend(struct platform_device *dev, pm_message_t msg)
938{
939 struct fb_info *info = platform_get_drvdata(dev);
940 struct xxxfb_par *par = info->par;
941
942 /* suspend here */
943 return 0;
944}
945
946/**
947 * xxxfb_resume - Optional but recommended function. Resume the device.
Antonino A. Daplasa42dc9d2007-05-08 00:38:55 -0700948 * @dev: platform device
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700949 *
950 * See Documentation/power/devices.txt for more information
951 */
Antonino A. Daplasa42dc9d2007-05-08 00:38:55 -0700952static int xxxfb_resume(struct platform_dev *dev)
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700953{
954 struct fb_info *info = platform_get_drvdata(dev);
955 struct xxxfb_par *par = info->par;
956
957 /* resume here */
958 return 0;
959}
960#else
961#define xxxfb_suspend NULL
962#define xxxfb_resume NULL
963#endif /* CONFIG_PM */
964
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800965static struct device_driver xxxfb_driver = {
966 .name = "xxxfb",
967 .bus = &platform_bus_type,
968 .probe = xxxfb_probe,
969 .remove = xxxfb_remove,
Krzysztof Helt36cc5352007-05-08 00:38:25 -0700970 .suspend = xxxfb_suspend, /* optional but recommended */
971 .resume = xxxfb_resume, /* optional but recommended */
Antonino A. Daplasd9112332006-01-09 20:53:34 -0800972};
973
974static struct platform_device xxxfb_device = {
975 .name = "xxxfb",
976};
977
978static int __init xxxfb_init(void)
979{
980 int ret;
981 /*
982 * For kernel boot options (in 'video=xxxfb:<options>' format)
983 */
984#ifndef MODULE
985 char *option = NULL;
986
987 if (fb_get_options("xxxfb", &option))
988 return -ENODEV;
989 xxxfb_setup(option);
990#endif
991 ret = driver_register(&xxxfb_driver);
992
993 if (!ret) {
994 ret = platform_device_register(&xxxfb_device);
995 if (ret)
996 driver_unregister(&xxxfb_driver);
997 }
998
999 return ret;
1000}
1001
1002static void __exit xxxfb_exit(void)
1003{
1004 platform_device_unregister(&xxxfb_device);
1005 driver_unregister(&xxxfb_driver);
1006}
Krzysztof Helt36cc5352007-05-08 00:38:25 -07001007#endif /* CONFIG_PCI */
Antonino A. Daplasd9112332006-01-09 20:53:34 -08001008
Krzysztof Helt36cc5352007-05-08 00:38:25 -07001009#ifdef MODULE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 /*
1011 * Setup
1012 */
1013
1014/*
1015 * Only necessary if your driver takes special options,
1016 * otherwise we fall back on the generic fb_setup().
1017 */
1018int __init xxxfb_setup(char *options)
1019{
1020 /* Parse user speficied options (`video=xxxfb:') */
1021}
Krzysztof Helt4c7bf382007-05-08 00:40:10 -07001022#endif /* MODULE */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023
1024/* ------------------------------------------------------------------------- */
1025
1026
1027 /*
1028 * Modularization
1029 */
1030
1031module_init(xxxfb_init);
Krzysztof Helt36cc5352007-05-08 00:38:25 -07001032module_exit(xxxfb_remove);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033
1034MODULE_LICENSE("GPL");