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Diffstat (limited to 'drivers/video/fbdev/skeletonfb.c')
| -rw-r--r-- | drivers/video/fbdev/skeletonfb.c | 1020 |
1 files changed, 1020 insertions, 0 deletions
diff --git a/drivers/video/fbdev/skeletonfb.c b/drivers/video/fbdev/skeletonfb.c new file mode 100644 index 000000000..bcacfb693 --- /dev/null +++ b/drivers/video/fbdev/skeletonfb.c @@ -0,0 +1,1020 @@ +/* + * linux/drivers/video/skeletonfb.c -- Skeleton for a frame buffer device + * + * Modified to new api Jan 2001 by James Simmons (jsimmons@transvirtual.com) + * + * Created 28 Dec 1997 by Geert Uytterhoeven + * + * + * I have started rewriting this driver as a example of the upcoming new API + * The primary goal is to remove the console code from fbdev and place it + * into fbcon.c. This reduces the code and makes writing a new fbdev driver + * easy since the author doesn't need to worry about console internals. It + * also allows the ability to run fbdev without a console/tty system on top + * of it. + * + * First the roles of struct fb_info and struct display have changed. Struct + * display will go away. The way the new framebuffer console code will + * work is that it will act to translate data about the tty/console in + * struct vc_data to data in a device independent way in struct fb_info. Then + * various functions in struct fb_ops will be called to store the device + * dependent state in the par field in struct fb_info and to change the + * hardware to that state. This allows a very clean separation of the fbdev + * layer from the console layer. It also allows one to use fbdev on its own + * which is a bounus for embedded devices. The reason this approach works is + * for each framebuffer device when used as a tty/console device is allocated + * a set of virtual terminals to it. Only one virtual terminal can be active + * per framebuffer device. We already have all the data we need in struct + * vc_data so why store a bunch of colormaps and other fbdev specific data + * per virtual terminal. + * + * As you can see doing this makes the con parameter pretty much useless + * for struct fb_ops functions, as it should be. Also having struct + * fb_var_screeninfo and other data in fb_info pretty much eliminates the + * need for get_fix and get_var. Once all drivers use the fix, var, and cmap + * fbcon can be written around these fields. This will also eliminate the + * need to regenerate struct fb_var_screeninfo, struct fb_fix_screeninfo + * struct fb_cmap every time get_var, get_fix, get_cmap functions are called + * as many drivers do now. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive for + * more details. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/fb.h> +#include <linux/init.h> +#include <linux/pci.h> + + /* + * This is just simple sample code. + * + * No warranty that it actually compiles. + * Even less warranty that it actually works :-) + */ + +/* + * Driver data + */ +static char *mode_option; + +/* + * If your driver supports multiple boards, you should make the + * below data types arrays, or allocate them dynamically (using kmalloc()). + */ + +/* + * This structure defines the hardware state of the graphics card. Normally + * you place this in a header file in linux/include/video. This file usually + * also includes register information. That allows other driver subsystems + * and userland applications the ability to use the same header file to + * avoid duplicate work and easy porting of software. + */ +struct xxx_par; + +/* + * Here we define the default structs fb_fix_screeninfo and fb_var_screeninfo + * if we don't use modedb. If we do use modedb see xxxfb_init how to use it + * to get a fb_var_screeninfo. Otherwise define a default var as well. + */ +static const struct fb_fix_screeninfo xxxfb_fix = { + .id = "FB's name", + .type = FB_TYPE_PACKED_PIXELS, + .visual = FB_VISUAL_PSEUDOCOLOR, + .xpanstep = 1, + .ypanstep = 1, + .ywrapstep = 1, + .accel = FB_ACCEL_NONE, +}; + + /* + * Modern graphical hardware not only supports pipelines but some + * also support multiple monitors where each display can have its + * its own unique data. In this case each display could be + * represented by a separate framebuffer device thus a separate + * struct fb_info. Now the struct xxx_par represents the graphics + * hardware state thus only one exist per card. In this case the + * struct xxx_par for each graphics card would be shared between + * every struct fb_info that represents a framebuffer on that card. + * This allows when one display changes it video resolution (info->var) + * the other displays know instantly. Each display can always be + * aware of the entire hardware state that affects it because they share + * the same xxx_par struct. The other side of the coin is multiple + * graphics cards that pass data around until it is finally displayed + * on one monitor. Such examples are the voodoo 1 cards and high end + * NUMA graphics servers. For this case we have a bunch of pars, each + * one that represents a graphics state, that belong to one struct + * fb_info. Their you would want to have *par point to a array of device + * states and have each struct fb_ops function deal with all those + * states. I hope this covers every possible hardware design. If not + * feel free to send your ideas at jsimmons@users.sf.net + */ + + /* + * If your driver supports multiple boards or it supports multiple + * framebuffers, you should make these arrays, or allocate them + * dynamically using framebuffer_alloc() and free them with + * framebuffer_release(). + */ +static struct fb_info info; + + /* + * Each one represents the state of the hardware. Most hardware have + * just one hardware state. These here represent the default state(s). + */ +static struct xxx_par __initdata current_par; + +int xxxfb_init(void); + +/** + * xxxfb_open - Optional function. Called when the framebuffer is + * first accessed. + * @info: frame buffer structure that represents a single frame buffer + * @user: tell us if the userland (value=1) or the console is accessing + * the framebuffer. + * + * This function is the first function called in the framebuffer api. + * Usually you don't need to provide this function. The case where it + * is used is to change from a text mode hardware state to a graphics + * mode state. + * + * Returns negative errno on error, or zero on success. + */ +static int xxxfb_open(struct fb_info *info, int user) +{ + return 0; +} + +/** + * xxxfb_release - Optional function. Called when the framebuffer + * device is closed. + * @info: frame buffer structure that represents a single frame buffer + * @user: tell us if the userland (value=1) or the console is accessing + * the framebuffer. + * + * Thus function is called when we close /dev/fb or the framebuffer + * console system is released. Usually you don't need this function. + * The case where it is usually used is to go from a graphics state + * to a text mode state. + * + * Returns negative errno on error, or zero on success. + */ +static int xxxfb_release(struct fb_info *info, int user) +{ + return 0; +} + +/** + * xxxfb_check_var - Optional function. Validates a var passed in. + * @var: frame buffer variable screen structure + * @info: frame buffer structure that represents a single frame buffer + * + * Checks to see if the hardware supports the state requested by + * var passed in. This function does not alter the hardware state!!! + * This means the data stored in struct fb_info and struct xxx_par do + * not change. This includes the var inside of struct fb_info. + * Do NOT change these. This function can be called on its own if we + * intent to only test a mode and not actually set it. The stuff in + * modedb.c is a example of this. If the var passed in is slightly + * off by what the hardware can support then we alter the var PASSED in + * to what we can do. + * + * For values that are off, this function must round them _up_ to the + * next value that is supported by the hardware. If the value is + * greater than the highest value supported by the hardware, then this + * function must return -EINVAL. + * + * Exception to the above rule: Some drivers have a fixed mode, ie, + * the hardware is already set at boot up, and cannot be changed. In + * this case, it is more acceptable that this function just return + * a copy of the currently working var (info->var). Better is to not + * implement this function, as the upper layer will do the copying + * of the current var for you. + * + * Note: This is the only function where the contents of var can be + * freely adjusted after the driver has been registered. If you find + * that you have code outside of this function that alters the content + * of var, then you are doing something wrong. Note also that the + * contents of info->var must be left untouched at all times after + * driver registration. + * + * Returns negative errno on error, or zero on success. + */ +static int xxxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) +{ + /* ... */ + return 0; +} + +/** + * xxxfb_set_par - Optional function. Alters the hardware state. + * @info: frame buffer structure that represents a single frame buffer + * + * Using the fb_var_screeninfo in fb_info we set the resolution of the + * this particular framebuffer. This function alters the par AND the + * fb_fix_screeninfo stored in fb_info. It doesn't not alter var in + * fb_info since we are using that data. This means we depend on the + * data in var inside fb_info to be supported by the hardware. + * + * This function is also used to recover/restore the hardware to a + * known working state. + * + * xxxfb_check_var is always called before xxxfb_set_par to ensure that + * the contents of var is always valid. + * + * Again if you can't change the resolution you don't need this function. + * + * However, even if your hardware does not support mode changing, + * a set_par might be needed to at least initialize the hardware to + * a known working state, especially if it came back from another + * process that also modifies the same hardware, such as X. + * + * If this is the case, a combination such as the following should work: + * + * static int xxxfb_check_var(struct fb_var_screeninfo *var, + * struct fb_info *info) + * { + * *var = info->var; + * return 0; + * } + * + * static int xxxfb_set_par(struct fb_info *info) + * { + * init your hardware here + * } + * + * Returns negative errno on error, or zero on success. + */ +static int xxxfb_set_par(struct fb_info *info) +{ + struct xxx_par *par = info->par; + /* ... */ + return 0; +} + +/** + * xxxfb_setcolreg - Optional function. Sets a color register. + * @regno: Which register in the CLUT we are programming + * @red: The red value which can be up to 16 bits wide + * @green: The green value which can be up to 16 bits wide + * @blue: The blue value which can be up to 16 bits wide. + * @transp: If supported, the alpha value which can be up to 16 bits wide. + * @info: frame buffer info structure + * + * Set a single color register. The values supplied have a 16 bit + * magnitude which needs to be scaled in this function for the hardware. + * Things to take into consideration are how many color registers, if + * any, are supported with the current color visual. With truecolor mode + * no color palettes are supported. Here a pseudo palette is created + * which we store the value in pseudo_palette in struct fb_info. For + * pseudocolor mode we have a limited color palette. To deal with this + * we can program what color is displayed for a particular pixel value. + * DirectColor is similar in that we can program each color field. If + * we have a static colormap we don't need to implement this function. + * + * Returns negative errno on error, or zero on success. + */ +static int xxxfb_setcolreg(unsigned regno, unsigned red, unsigned green, + unsigned blue, unsigned transp, + struct fb_info *info) +{ + if (regno >= 256) /* no. of hw registers */ + return -EINVAL; + /* + * Program hardware... do anything you want with transp + */ + + /* grayscale works only partially under directcolor */ + if (info->var.grayscale) { + /* grayscale = 0.30*R + 0.59*G + 0.11*B */ + red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8; + } + + /* Directcolor: + * var->{color}.offset contains start of bitfield + * var->{color}.length contains length of bitfield + * {hardwarespecific} contains width of DAC + * pseudo_palette[X] is programmed to (X << red.offset) | + * (X << green.offset) | + * (X << blue.offset) + * RAMDAC[X] is programmed to (red, green, blue) + * color depth = SUM(var->{color}.length) + * + * Pseudocolor: + * var->{color}.offset is 0 unless the palette index takes less than + * bits_per_pixel bits and is stored in the upper + * bits of the pixel value + * var->{color}.length is set so that 1 << length is the number of + * available palette entries + * pseudo_palette is not used + * RAMDAC[X] is programmed to (red, green, blue) + * color depth = var->{color}.length + * + * Static pseudocolor: + * same as Pseudocolor, but the RAMDAC is not programmed (read-only) + * + * Mono01/Mono10: + * Has only 2 values, black on white or white on black (fg on bg), + * var->{color}.offset is 0 + * white = (1 << var->{color}.length) - 1, black = 0 + * pseudo_palette is not used + * RAMDAC does not exist + * color depth is always 2 + * + * Truecolor: + * does not use RAMDAC (usually has 3 of them). + * var->{color}.offset contains start of bitfield + * var->{color}.length contains length of bitfield + * pseudo_palette is programmed to (red << red.offset) | + * (green << green.offset) | + * (blue << blue.offset) | + * (transp << transp.offset) + * RAMDAC does not exist + * color depth = SUM(var->{color}.length}) + * + * The color depth is used by fbcon for choosing the logo and also + * for color palette transformation if color depth < 4 + * + * As can be seen from the above, the field bits_per_pixel is _NOT_ + * a criteria for describing the color visual. + * + * A common mistake is assuming that bits_per_pixel <= 8 is pseudocolor, + * and higher than that, true/directcolor. This is incorrect, one needs + * to look at the fix->visual. + * + * Another common mistake is using bits_per_pixel to calculate the color + * depth. The bits_per_pixel field does not directly translate to color + * depth. You have to compute for the color depth (using the color + * bitfields) and fix->visual as seen above. + */ + + /* + * This is the point where the color is converted to something that + * is acceptable by the hardware. + */ +#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16) + red = CNVT_TOHW(red, info->var.red.length); + green = CNVT_TOHW(green, info->var.green.length); + blue = CNVT_TOHW(blue, info->var.blue.length); + transp = CNVT_TOHW(transp, info->var.transp.length); +#undef CNVT_TOHW + /* + * This is the point where the function feeds the color to the hardware + * palette after converting the colors to something acceptable by + * the hardware. Note, only FB_VISUAL_DIRECTCOLOR and + * FB_VISUAL_PSEUDOCOLOR visuals need to write to the hardware palette. + * If you have code that writes to the hardware CLUT, and it's not + * any of the above visuals, then you are doing something wrong. + */ + if (info->fix.visual == FB_VISUAL_DIRECTCOLOR || + info->fix.visual == FB_VISUAL_TRUECOLOR) + write_{red|green|blue|transp}_to_clut(); + + /* This is the point were you need to fill up the contents of + * info->pseudo_palette. This structure is used _only_ by fbcon, thus + * it only contains 16 entries to match the number of colors supported + * by the console. The pseudo_palette is used only if the visual is + * in directcolor or truecolor mode. With other visuals, the + * pseudo_palette is not used. (This might change in the future.) + * + * The contents of the pseudo_palette is in raw pixel format. Ie, each + * entry can be written directly to the framebuffer without any conversion. + * The pseudo_palette is (void *). However, if using the generic + * drawing functions (cfb_imageblit, cfb_fillrect), the pseudo_palette + * must be casted to (u32 *) _regardless_ of the bits per pixel. If the + * driver is using its own drawing functions, then it can use whatever + * size it wants. + */ + if (info->fix.visual == FB_VISUAL_TRUECOLOR || + info->fix.visual == FB_VISUAL_DIRECTCOLOR) { + u32 v; + + if (regno >= 16) + return -EINVAL; + + v = (red << info->var.red.offset) | + (green << info->var.green.offset) | + (blue << info->var.blue.offset) | + (transp << info->var.transp.offset); + + ((u32*)(info->pseudo_palette))[regno] = v; + } + + /* ... */ + return 0; +} + +/** + * xxxfb_pan_display - NOT a required function. Pans the display. + * @var: frame buffer variable screen structure + * @info: frame buffer structure that represents a single frame buffer + * + * Pan (or wrap, depending on the `vmode' field) the display using the + * `xoffset' and `yoffset' fields of the `var' structure. + * If the values don't fit, return -EINVAL. + * + * Returns negative errno on error, or zero on success. + */ +static int xxxfb_pan_display(struct fb_var_screeninfo *var, + struct fb_info *info) +{ + /* + * If your hardware does not support panning, _do_ _not_ implement this + * function. Creating a dummy function will just confuse user apps. + */ + + /* + * Note that even if this function is fully functional, a setting of + * 0 in both xpanstep and ypanstep means that this function will never + * get called. + */ + + /* ... */ + return 0; +} + +/** + * xxxfb_blank - NOT a required function. Blanks the display. + * @blank_mode: the blank mode we want. + * @info: frame buffer structure that represents a single frame buffer + * + * Blank the screen if blank_mode != FB_BLANK_UNBLANK, else unblank. + * Return 0 if blanking succeeded, != 0 if un-/blanking failed due to + * e.g. a video mode which doesn't support it. + * + * Implements VESA suspend and powerdown modes on hardware that supports + * disabling hsync/vsync: + * + * FB_BLANK_NORMAL = display is blanked, syncs are on. + * FB_BLANK_HSYNC_SUSPEND = hsync off + * FB_BLANK_VSYNC_SUSPEND = vsync off + * FB_BLANK_POWERDOWN = hsync and vsync off + * + * If implementing this function, at least support FB_BLANK_UNBLANK. + * Return !0 for any modes that are unimplemented. + * + */ +static int xxxfb_blank(int blank_mode, struct fb_info *info) +{ + /* ... */ + return 0; +} + +/* ------------ Accelerated Functions --------------------- */ + +/* + * We provide our own functions if we have hardware acceleration + * or non packed pixel format layouts. If we have no hardware + * acceleration, we can use a generic unaccelerated function. If using + * a pack pixel format just use the functions in cfb_*.c. Each file + * has one of the three different accel functions we support. + */ + +/** + * xxxfb_fillrect - REQUIRED function. Can use generic routines if + * non acclerated hardware and packed pixel based. + * Draws a rectangle on the screen. + * + * @info: frame buffer structure that represents a single frame buffer + * @region: The structure representing the rectangular region we + * wish to draw to. + * + * This drawing operation places/removes a retangle on the screen + * depending on the rastering operation with the value of color which + * is in the current color depth format. + */ +void xxxfb_fillrect(struct fb_info *p, const struct fb_fillrect *region) +{ +/* Meaning of struct fb_fillrect + * + * @dx: The x and y corrdinates of the upper left hand corner of the + * @dy: area we want to draw to. + * @width: How wide the rectangle is we want to draw. + * @height: How tall the rectangle is we want to draw. + * @color: The color to fill in the rectangle with. + * @rop: The raster operation. We can draw the rectangle with a COPY + * of XOR which provides erasing effect. + */ +} + +/** + * xxxfb_copyarea - REQUIRED function. Can use generic routines if + * non acclerated hardware and packed pixel based. + * Copies one area of the screen to another area. + * + * @info: frame buffer structure that represents a single frame buffer + * @area: Structure providing the data to copy the framebuffer contents + * from one region to another. + * + * This drawing operation copies a rectangular area from one area of the + * screen to another area. + */ +void xxxfb_copyarea(struct fb_info *p, const struct fb_copyarea *area) +{ +/* + * @dx: The x and y coordinates of the upper left hand corner of the + * @dy: destination area on the screen. + * @width: How wide the rectangle is we want to copy. + * @height: How tall the rectangle is we want to copy. + * @sx: The x and y coordinates of the upper left hand corner of the + * @sy: source area on the screen. + */ +} + + +/** + * xxxfb_imageblit - REQUIRED function. Can use generic routines if + * non acclerated hardware and packed pixel based. + * Copies a image from system memory to the screen. + * + * @info: frame buffer structure that represents a single frame buffer + * @image: structure defining the image. + * + * This drawing operation draws a image on the screen. It can be a + * mono image (needed for font handling) or a color image (needed for + * tux). + */ +void xxxfb_imageblit(struct fb_info *p, const struct fb_image *image) +{ +/* + * @dx: The x and y coordinates of the upper left hand corner of the + * @dy: destination area to place the image on the screen. + * @width: How wide the image is we want to copy. + * @height: How tall the image is we want to copy. + * @fg_color: For mono bitmap images this is color data for + * @bg_color: the foreground and background of the image to + * write directly to the frmaebuffer. + * @depth: How many bits represent a single pixel for this image. + * @data: The actual data used to construct the image on the display. + * @cmap: The colormap used for color images. + */ + +/* + * The generic function, cfb_imageblit, expects that the bitmap scanlines are + * padded to the next byte. Most hardware accelerators may require padding to + * the next u16 or the next u32. If that is the case, the driver can specify + * this by setting info->pixmap.scan_align = 2 or 4. See a more + * comprehensive description of the pixmap below. + */ +} + +/** + * xxxfb_cursor - OPTIONAL. If your hardware lacks support + * for a cursor, leave this field NULL. + * + * @info: frame buffer structure that represents a single frame buffer + * @cursor: structure defining the cursor to draw. + * + * This operation is used to set or alter the properities of the + * cursor. + * + * Returns negative errno on error, or zero on success. + */ +int xxxfb_cursor(struct fb_info *info, struct fb_cursor *cursor) +{ +/* + * @set: Which fields we are altering in struct fb_cursor + * @enable: Disable or enable the cursor + * @rop: The bit operation we want to do. + * @mask: This is the cursor mask bitmap. + * @dest: A image of the area we are going to display the cursor. + * Used internally by the driver. + * @hot: The hot spot. + * @image: The actual data for the cursor image. + * + * NOTES ON FLAGS (cursor->set): + * + * FB_CUR_SETIMAGE - the cursor image has changed (cursor->image.data) + * FB_CUR_SETPOS - the cursor position has changed (cursor->image.dx|dy) + * FB_CUR_SETHOT - the cursor hot spot has changed (cursor->hot.dx|dy) + * FB_CUR_SETCMAP - the cursor colors has changed (cursor->fg_color|bg_color) + * FB_CUR_SETSHAPE - the cursor bitmask has changed (cursor->mask) + * FB_CUR_SETSIZE - the cursor size has changed (cursor->width|height) + * FB_CUR_SETALL - everything has changed + * + * NOTES ON ROPs (cursor->rop, Raster Operation) + * + * ROP_XOR - cursor->image.data XOR cursor->mask + * ROP_COPY - curosr->image.data AND cursor->mask + * + * OTHER NOTES: + * + * - fbcon only supports a 2-color cursor (cursor->image.depth = 1) + * - The fb_cursor structure, @cursor, _will_ always contain valid + * fields, whether any particular bitfields in cursor->set is set + * or not. + */ +} + +/** + * xxxfb_sync - NOT a required function. Normally the accel engine + * for a graphics card take a specific amount of time. + * Often we have to wait for the accelerator to finish + * its operation before we can write to the framebuffer + * so we can have consistent display output. + * + * @info: frame buffer structure that represents a single frame buffer + * + * If the driver has implemented its own hardware-based drawing function, + * implementing this function is highly recommended. + */ +int xxxfb_sync(struct fb_info *info) +{ + return 0; +} + + /* + * Frame buffer operations + */ + +static const struct fb_ops xxxfb_ops = { + .owner = THIS_MODULE, + .fb_open = xxxfb_open, + .fb_read = xxxfb_read, + .fb_write = xxxfb_write, + .fb_release = xxxfb_release, + .fb_check_var = xxxfb_check_var, + .fb_set_par = xxxfb_set_par, + .fb_setcolreg = xxxfb_setcolreg, + .fb_blank = xxxfb_blank, + .fb_pan_display = xxxfb_pan_display, + .fb_fillrect = xxxfb_fillrect, /* Needed !!! */ + .fb_copyarea = xxxfb_copyarea, /* Needed !!! */ + .fb_imageblit = xxxfb_imageblit, /* Needed !!! */ + .fb_cursor = xxxfb_cursor, /* Optional !!! */ + .fb_sync = xxxfb_sync, + .fb_ioctl = xxxfb_ioctl, + .fb_mmap = xxxfb_mmap, +}; + +/* ------------------------------------------------------------------------- */ + + /* + * Initialization + */ + +/* static int __init xxfb_probe (struct platform_device *pdev) -- for platform devs */ +static int xxxfb_probe(struct pci_dev *dev, const struct pci_device_id *ent) +{ + struct fb_info *info; + struct xxx_par *par; + struct device *device = &dev->dev; /* or &pdev->dev */ + int cmap_len, retval; + + /* + * Dynamically allocate info and par + */ + info = framebuffer_alloc(sizeof(struct xxx_par), device); + + if (!info) { + /* goto error path */ + } + + par = info->par; + + /* + * Here we set the screen_base to the virtual memory address + * for the framebuffer. Usually we obtain the resource address + * from the bus layer and then translate it to virtual memory + * space via ioremap. Consult ioport.h. + */ + info->screen_base = framebuffer_virtual_memory; + info->fbops = &xxxfb_ops; + info->fix = xxxfb_fix; + info->pseudo_palette = pseudo_palette; /* The pseudopalette is an + * 16-member array + */ + /* + * Set up flags to indicate what sort of acceleration your + * driver can provide (pan/wrap/copyarea/etc.) and whether it + * is a module -- see FBINFO_* in include/linux/fb.h + * + * If your hardware can support any of the hardware accelerated functions + * fbcon performance will improve if info->flags is set properly. + * + * FBINFO_HWACCEL_COPYAREA - hardware moves + * FBINFO_HWACCEL_FILLRECT - hardware fills + * FBINFO_HWACCEL_IMAGEBLIT - hardware mono->color expansion + * FBINFO_HWACCEL_YPAN - hardware can pan display in y-axis + * FBINFO_HWACCEL_YWRAP - hardware can wrap display in y-axis + * FBINFO_HWACCEL_DISABLED - supports hardware accels, but disabled + * FBINFO_READS_FAST - if set, prefer moves over mono->color expansion + * FBINFO_MISC_TILEBLITTING - hardware can do tile blits + * + * NOTE: These are for fbcon use only. + */ + info->flags = FBINFO_DEFAULT; + +/********************* This stage is optional ******************************/ + /* + * The struct pixmap is a scratch pad for the drawing functions. This + * is where the monochrome bitmap is constructed by the higher layers + * and then passed to the accelerator. For drivers that uses + * cfb_imageblit, you can skip this part. For those that have a more + * rigorous requirement, this stage is needed + */ + + /* PIXMAP_SIZE should be small enough to optimize drawing, but not + * large enough that memory is wasted. A safe size is + * (max_xres * max_font_height/8). max_xres is driver dependent, + * max_font_height is 32. + */ + info->pixmap.addr = kmalloc(PIXMAP_SIZE, GFP_KERNEL); + if (!info->pixmap.addr) { + /* goto error */ + } + + info->pixmap.size = PIXMAP_SIZE; + + /* + * FB_PIXMAP_SYSTEM - memory is in system ram + * FB_PIXMAP_IO - memory is iomapped + * FB_PIXMAP_SYNC - if set, will call fb_sync() per access to pixmap, + * usually if FB_PIXMAP_IO is set. + * + * Currently, FB_PIXMAP_IO is unimplemented. + */ + info->pixmap.flags = FB_PIXMAP_SYSTEM; + + /* + * scan_align is the number of padding for each scanline. It is in bytes. + * Thus for accelerators that need padding to the next u32, put 4 here. + */ + info->pixmap.scan_align = 4; + + /* + * buf_align is the amount to be padded for the buffer. For example, + * the i810fb needs a scan_align of 2 but expects it to be fed with + * dwords, so a buf_align = 4 is required. + */ + info->pixmap.buf_align = 4; + + /* access_align is how many bits can be accessed from the framebuffer + * ie. some epson cards allow 16-bit access only. Most drivers will + * be safe with u32 here. + * + * NOTE: This field is currently unused. + */ + info->pixmap.access_align = 32; +/***************************** End optional stage ***************************/ + + /* + * This should give a reasonable default video mode. The following is + * done when we can set a video mode. + */ + if (!mode_option) + mode_option = "640x480@60"; + + retval = fb_find_mode(&info->var, info, mode_option, NULL, 0, NULL, 8); + + if (!retval || retval == 4) + return -EINVAL; + + /* This has to be done! */ + if (fb_alloc_cmap(&info->cmap, cmap_len, 0)) + return -ENOMEM; + + /* + * The following is done in the case of having hardware with a static + * mode. If we are setting the mode ourselves we don't call this. + */ + info->var = xxxfb_var; + + /* + * For drivers that can... + */ + xxxfb_check_var(&info->var, info); + + /* + * Does a call to fb_set_par() before register_framebuffer needed? This + * will depend on you and the hardware. If you are sure that your driver + * is the only device in the system, a call to fb_set_par() is safe. + * + * Hardware in x86 systems has a VGA core. Calling set_par() at this + * point will corrupt the VGA console, so it might be safer to skip a + * call to set_par here and just allow fbcon to do it for you. + */ + /* xxxfb_set_par(info); */ + + if (register_framebuffer(info) < 0) { + fb_dealloc_cmap(&info->cmap); + return -EINVAL; + } + fb_info(info, "%s frame buffer device\n", info->fix.id); + pci_set_drvdata(dev, info); /* or platform_set_drvdata(pdev, info) */ + return 0; +} + + /* + * Cleanup + */ +/* static void xxxfb_remove(struct platform_device *pdev) */ +static void xxxfb_remove(struct pci_dev *dev) +{ + struct fb_info *info = pci_get_drvdata(dev); + /* or platform_get_drvdata(pdev); */ + + if (info) { + unregister_framebuffer(info); + fb_dealloc_cmap(&info->cmap); + /* ... */ + framebuffer_release(info); + } +} + +#ifdef CONFIG_PCI +#ifdef CONFIG_PM +/** + * xxxfb_suspend - Optional but recommended function. Suspend the device. + * @dev: PCI device + * @msg: the suspend event code. + * + * See Documentation/driver-api/pm/devices.rst for more information + */ +static int xxxfb_suspend(struct pci_dev *dev, pm_message_t msg) +{ + struct fb_info *info = pci_get_drvdata(dev); + struct xxxfb_par *par = info->par; + + /* suspend here */ + return 0; +} + +/** + * xxxfb_resume - Optional but recommended function. Resume the device. + * @dev: PCI device + * + * See Documentation/driver-api/pm/devices.rst for more information + */ +static int xxxfb_resume(struct pci_dev *dev) +{ + struct fb_info *info = pci_get_drvdata(dev); + struct xxxfb_par *par = info->par; + + /* resume here */ + return 0; +} +#else +#define xxxfb_suspend NULL +#define xxxfb_resume NULL +#endif /* CONFIG_PM */ + +static const struct pci_device_id xxxfb_id_table[] = { + { PCI_VENDOR_ID_XXX, PCI_DEVICE_ID_XXX, + PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY << 16, + PCI_CLASS_MASK, 0 }, + { 0, } +}; + +/* For PCI drivers */ +static struct pci_driver xxxfb_driver = { + .name = "xxxfb", + .id_table = xxxfb_id_table, + .probe = xxxfb_probe, + .remove = xxxfb_remove, + .suspend = xxxfb_suspend, /* optional but recommended */ + .resume = xxxfb_resume, /* optional but recommended */ +}; + +MODULE_DEVICE_TABLE(pci, xxxfb_id_table); + +int __init xxxfb_init(void) +{ + /* + * For kernel boot options (in 'video=xxxfb:<options>' format) + */ +#ifndef MODULE + char *option = NULL; + + if (fb_get_options("xxxfb", &option)) + return -ENODEV; + xxxfb_setup(option); +#endif + + return pci_register_driver(&xxxfb_driver); +} + +static void __exit xxxfb_exit(void) +{ + pci_unregister_driver(&xxxfb_driver); +} +#else /* non PCI, platform drivers */ +#include <linux/platform_device.h> +/* for platform devices */ + +#ifdef CONFIG_PM +/** + * xxxfb_suspend - Optional but recommended function. Suspend the device. + * @dev: platform device + * @msg: the suspend event code. + * + * See Documentation/driver-api/pm/devices.rst for more information + */ +static int xxxfb_suspend(struct platform_device *dev, pm_message_t msg) +{ + struct fb_info *info = platform_get_drvdata(dev); + struct xxxfb_par *par = info->par; + + /* suspend here */ + return 0; +} + +/** + * xxxfb_resume - Optional but recommended function. Resume the device. + * @dev: platform device + * + * See Documentation/driver-api/pm/devices.rst for more information + */ +static int xxxfb_resume(struct platform_dev *dev) +{ + struct fb_info *info = platform_get_drvdata(dev); + struct xxxfb_par *par = info->par; + + /* resume here */ + return 0; +} +#else +#define xxxfb_suspend NULL +#define xxxfb_resume NULL +#endif /* CONFIG_PM */ + +static struct platform_device_driver xxxfb_driver = { + .probe = xxxfb_probe, + .remove = xxxfb_remove, + .suspend = xxxfb_suspend, /* optional but recommended */ + .resume = xxxfb_resume, /* optional but recommended */ + .driver = { + .name = "xxxfb", + }, +}; + +static struct platform_device *xxxfb_device; + +#ifndef MODULE + /* + * Setup + */ + +/* + * Only necessary if your driver takes special options, + * otherwise we fall back on the generic fb_setup(). + */ +int __init xxxfb_setup(char *options) +{ + /* Parse user specified options (`video=xxxfb:') */ +} +#endif /* MODULE */ + +static int __init xxxfb_init(void) +{ + int ret; + /* + * For kernel boot options (in 'video=xxxfb:<options>' format) + */ +#ifndef MODULE + char *option = NULL; + + if (fb_get_options("xxxfb", &option)) + return -ENODEV; + xxxfb_setup(option); +#endif + ret = platform_driver_register(&xxxfb_driver); + + if (!ret) { + xxxfb_device = platform_device_register_simple("xxxfb", 0, + NULL, 0); + + if (IS_ERR(xxxfb_device)) { + platform_driver_unregister(&xxxfb_driver); + ret = PTR_ERR(xxxfb_device); + } + } + + return ret; +} + +static void __exit xxxfb_exit(void) +{ + platform_device_unregister(xxxfb_device); + platform_driver_unregister(&xxxfb_driver); +} +#endif /* CONFIG_PCI */ + +/* ------------------------------------------------------------------------- */ + + + /* + * Modularization + */ + +module_init(xxxfb_init); +module_exit(xxxfb_exit); + +MODULE_LICENSE("GPL"); |