LXR linux/drivers/media/platform/vivid/vivid-osd.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * vivid-osd.c - osd support for testing overlays.
   4 *
   5 * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
   6 */
   7
   8#include <linux/module.h>
   9#include <linux/errno.h>
  10#include <linux/kernel.h>
  11#include <linux/init.h>
  12#include <linux/sched.h>
  13#include <linux/slab.h>
  14#include <linux/font.h>
  15#include <linux/mutex.h>
  16#include <linux/videodev2.h>
  17#include <linux/kthread.h>
  18#include <linux/freezer.h>
  19#include <linux/fb.h>
  20#include <media/videobuf2-vmalloc.h>
  21#include <media/v4l2-device.h>
  22#include <media/v4l2-ioctl.h>
  23#include <media/v4l2-ctrls.h>
  24#include <media/v4l2-fh.h>
  25#include <media/v4l2-event.h>
  26#include <media/v4l2-common.h>
  27
  28#include "vivid-core.h"
  29#include "vivid-osd.h"
  30
  31#define MAX_OSD_WIDTH  720
  32#define MAX_OSD_HEIGHT 576
  33
  34/*
  35 * Order: white, yellow, cyan, green, magenta, red, blue, black,
  36 * and same again with the alpha bit set (if any)
  37 */
  38static const u16 rgb555[16] = {
  39        0x7fff, 0x7fe0, 0x03ff, 0x03e0, 0x7c1f, 0x7c00, 0x001f, 0x0000,
  40        0xffff, 0xffe0, 0x83ff, 0x83e0, 0xfc1f, 0xfc00, 0x801f, 0x8000
  41};
  42
  43static const u16 rgb565[16] = {
  44        0xffff, 0xffe0, 0x07ff, 0x07e0, 0xf81f, 0xf800, 0x001f, 0x0000,
  45        0xffff, 0xffe0, 0x07ff, 0x07e0, 0xf81f, 0xf800, 0x001f, 0x0000
  46};
  47
  48void vivid_clear_fb(struct vivid_dev *dev)
  49{
  50        void *p = dev->video_vbase;
  51        const u16 *rgb = rgb555;
  52        unsigned x, y;
  53
  54        if (dev->fb_defined.green.length == 6)
  55                rgb = rgb565;
  56
  57        for (y = 0; y < dev->display_height; y++) {
  58                u16 *d = p;
  59
  60                for (x = 0; x < dev->display_width; x++)
  61                        d[x] = rgb[(y / 16 + x / 16) % 16];
  62                p += dev->display_byte_stride;
  63        }
  64}
  65
  66/* --------------------------------------------------------------------- */
  67
  68static int vivid_fb_ioctl(struct fb_info *info, unsigned cmd, unsigned long arg)
  69{
  70        struct vivid_dev *dev = (struct vivid_dev *)info->par;
  71
  72        switch (cmd) {
  73        case FBIOGET_VBLANK: {
  74                struct fb_vblank vblank;
  75
  76                memset(&vblank, 0, sizeof(vblank));
  77                vblank.flags = FB_VBLANK_HAVE_COUNT | FB_VBLANK_HAVE_VCOUNT |
  78                        FB_VBLANK_HAVE_VSYNC;
  79                vblank.count = 0;
  80                vblank.vcount = 0;
  81                vblank.hcount = 0;
  82                if (copy_to_user((void __user *)arg, &vblank, sizeof(vblank)))
  83                        return -EFAULT;
  84                return 0;
  85        }
  86
  87        default:
  88                dprintk(dev, 1, "Unknown ioctl %08x\n", cmd);
  89                return -EINVAL;
  90        }
  91        return 0;
  92}
  93
  94/* Framebuffer device handling */
  95
  96static int vivid_fb_set_var(struct vivid_dev *dev, struct fb_var_screeninfo *var)
  97{
  98        dprintk(dev, 1, "vivid_fb_set_var\n");
  99
 100        if (var->bits_per_pixel != 16) {
 101                dprintk(dev, 1, "vivid_fb_set_var - Invalid bpp\n");
 102                return -EINVAL;
 103        }
 104        dev->display_byte_stride = var->xres * dev->bytes_per_pixel;
 105
 106        return 0;
 107}
 108
 109static int vivid_fb_get_fix(struct vivid_dev *dev, struct fb_fix_screeninfo *fix)
 110{
 111        dprintk(dev, 1, "vivid_fb_get_fix\n");
 112        memset(fix, 0, sizeof(struct fb_fix_screeninfo));
 113        strscpy(fix->id, "vioverlay fb", sizeof(fix->id));
 114        fix->smem_start = dev->video_pbase;
 115        fix->smem_len = dev->video_buffer_size;
 116        fix->type = FB_TYPE_PACKED_PIXELS;
 117        fix->visual = FB_VISUAL_TRUECOLOR;
 118        fix->xpanstep = 1;
 119        fix->ypanstep = 1;
 120        fix->ywrapstep = 0;
 121        fix->line_length = dev->display_byte_stride;
 122        fix->accel = FB_ACCEL_NONE;
 123        return 0;
 124}
 125
 126/* Check the requested display mode, returning -EINVAL if we can't
 127   handle it. */
 128
 129static int _vivid_fb_check_var(struct fb_var_screeninfo *var, struct vivid_dev *dev)
 130{
 131        dprintk(dev, 1, "vivid_fb_check_var\n");
 132
 133        var->bits_per_pixel = 16;
 134        if (var->green.length == 5) {
 135                var->red.offset = 10;
 136                var->red.length = 5;
 137                var->green.offset = 5;
 138                var->green.length = 5;
 139                var->blue.offset = 0;
 140                var->blue.length = 5;
 141                var->transp.offset = 15;
 142                var->transp.length = 1;
 143        } else {
 144                var->red.offset = 11;
 145                var->red.length = 5;
 146                var->green.offset = 5;
 147                var->green.length = 6;
 148                var->blue.offset = 0;
 149                var->blue.length = 5;
 150                var->transp.offset = 0;
 151                var->transp.length = 0;
 152        }
 153        var->xoffset = var->yoffset = 0;
 154        var->left_margin = var->upper_margin = 0;
 155        var->nonstd = 0;
 156
 157        var->vmode &= ~FB_VMODE_MASK;
 158        var->vmode |= FB_VMODE_NONINTERLACED;
 159
 160        /* Dummy values */
 161        var->hsync_len = 24;
 162        var->vsync_len = 2;
 163        var->pixclock = 84316;
 164        var->right_margin = 776;
 165        var->lower_margin = 591;
 166        return 0;
 167}
 168
 169static int vivid_fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 170{
 171        struct vivid_dev *dev = (struct vivid_dev *) info->par;
 172
 173        dprintk(dev, 1, "vivid_fb_check_var\n");
 174        return _vivid_fb_check_var(var, dev);
 175}
 176
 177static int vivid_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
 178{
 179        return 0;
 180}
 181
 182static int vivid_fb_set_par(struct fb_info *info)
 183{
 184        int rc = 0;
 185        struct vivid_dev *dev = (struct vivid_dev *) info->par;
 186
 187        dprintk(dev, 1, "vivid_fb_set_par\n");
 188
 189        rc = vivid_fb_set_var(dev, &info->var);
 190        vivid_fb_get_fix(dev, &info->fix);
 191        return rc;
 192}
 193
 194static int vivid_fb_setcolreg(unsigned regno, unsigned red, unsigned green,
 195                                unsigned blue, unsigned transp,
 196                                struct fb_info *info)
 197{
 198        u32 color, *palette;
 199
 200        if (regno >= info->cmap.len)
 201                return -EINVAL;
 202
 203        color = ((transp & 0xFF00) << 16) | ((red & 0xFF00) << 8) |
 204                 (green & 0xFF00) | ((blue & 0xFF00) >> 8);
 205        if (regno >= 16)
 206                return -EINVAL;
 207
 208        palette = info->pseudo_palette;
 209        if (info->var.bits_per_pixel == 16) {
 210                switch (info->var.green.length) {
 211                case 6:
 212                        color = (red & 0xf800) |
 213                                ((green & 0xfc00) >> 5) |
 214                                ((blue & 0xf800) >> 11);
 215                        break;
 216                case 5:
 217                        color = ((red & 0xf800) >> 1) |
 218                                ((green & 0xf800) >> 6) |
 219                                ((blue & 0xf800) >> 11) |
 220                                (transp ? 0x8000 : 0);
 221                        break;
 222                }
 223        }
 224        palette[regno] = color;
 225        return 0;
 226}
 227
 228/* We don't really support blanking. All this does is enable or
 229   disable the OSD. */
 230static int vivid_fb_blank(int blank_mode, struct fb_info *info)
 231{
 232        struct vivid_dev *dev = (struct vivid_dev *)info->par;
 233
 234        dprintk(dev, 1, "Set blanking mode : %d\n", blank_mode);
 235        switch (blank_mode) {
 236        case FB_BLANK_UNBLANK:
 237                break;
 238        case FB_BLANK_NORMAL:
 239        case FB_BLANK_HSYNC_SUSPEND:
 240        case FB_BLANK_VSYNC_SUSPEND:
 241        case FB_BLANK_POWERDOWN:
 242                break;
 243        }
 244        return 0;
 245}
 246
 247static struct fb_ops vivid_fb_ops = {
 248        .owner = THIS_MODULE,
 249        .fb_check_var   = vivid_fb_check_var,
 250        .fb_set_par     = vivid_fb_set_par,
 251        .fb_setcolreg   = vivid_fb_setcolreg,
 252        .fb_fillrect    = cfb_fillrect,
 253        .fb_copyarea    = cfb_copyarea,
 254        .fb_imageblit   = cfb_imageblit,
 255        .fb_cursor      = NULL,
 256        .fb_ioctl       = vivid_fb_ioctl,
 257        .fb_pan_display = vivid_fb_pan_display,
 258        .fb_blank       = vivid_fb_blank,
 259};
 260
 261/* Initialization */
 262
 263
 264/* Setup our initial video mode */
 265static int vivid_fb_init_vidmode(struct vivid_dev *dev)
 266{
 267        struct v4l2_rect start_window;
 268
 269        /* Color mode */
 270
 271        dev->bits_per_pixel = 16;
 272        dev->bytes_per_pixel = dev->bits_per_pixel / 8;
 273
 274        start_window.width = MAX_OSD_WIDTH;
 275        start_window.left = 0;
 276
 277        dev->display_byte_stride = start_window.width * dev->bytes_per_pixel;
 278
 279        /* Vertical size & position */
 280
 281        start_window.height = MAX_OSD_HEIGHT;
 282        start_window.top = 0;
 283
 284        dev->display_width = start_window.width;
 285        dev->display_height = start_window.height;
 286
 287        /* Generate a valid fb_var_screeninfo */
 288
 289        dev->fb_defined.xres = dev->display_width;
 290        dev->fb_defined.yres = dev->display_height;
 291        dev->fb_defined.xres_virtual = dev->display_width;
 292        dev->fb_defined.yres_virtual = dev->display_height;
 293        dev->fb_defined.bits_per_pixel = dev->bits_per_pixel;
 294        dev->fb_defined.vmode = FB_VMODE_NONINTERLACED;
 295        dev->fb_defined.left_margin = start_window.left + 1;
 296        dev->fb_defined.upper_margin = start_window.top + 1;
 297        dev->fb_defined.accel_flags = FB_ACCEL_NONE;
 298        dev->fb_defined.nonstd = 0;
 299        /* set default to 1:5:5:5 */
 300        dev->fb_defined.green.length = 5;
 301
 302        /* We've filled in the most data, let the usual mode check
 303           routine fill in the rest. */
 304        _vivid_fb_check_var(&dev->fb_defined, dev);
 305
 306        /* Generate valid fb_fix_screeninfo */
 307
 308        vivid_fb_get_fix(dev, &dev->fb_fix);
 309
 310        /* Generate valid fb_info */
 311
 312        dev->fb_info.node = -1;
 313        dev->fb_info.flags = FBINFO_FLAG_DEFAULT;
 314        dev->fb_info.fbops = &vivid_fb_ops;
 315        dev->fb_info.par = dev;
 316        dev->fb_info.var = dev->fb_defined;
 317        dev->fb_info.fix = dev->fb_fix;
 318        dev->fb_info.screen_base = (u8 __iomem *)dev->video_vbase;
 319        dev->fb_info.fbops = &vivid_fb_ops;
 320
 321        /* Supply some monitor specs. Bogus values will do for now */
 322        dev->fb_info.monspecs.hfmin = 8000;
 323        dev->fb_info.monspecs.hfmax = 70000;
 324        dev->fb_info.monspecs.vfmin = 10;
 325        dev->fb_info.monspecs.vfmax = 100;
 326
 327        /* Allocate color map */
 328        if (fb_alloc_cmap(&dev->fb_info.cmap, 256, 1)) {
 329                pr_err("abort, unable to alloc cmap\n");
 330                return -ENOMEM;
 331        }
 332
 333        /* Allocate the pseudo palette */
 334        dev->fb_info.pseudo_palette = kmalloc_array(16, sizeof(u32), GFP_KERNEL);
 335
 336        return dev->fb_info.pseudo_palette ? 0 : -ENOMEM;
 337}
 338
 339/* Release any memory we've grabbed */
 340void vivid_fb_release_buffers(struct vivid_dev *dev)
 341{
 342        if (dev->video_vbase == NULL)
 343                return;
 344
 345        /* Release cmap */
 346        if (dev->fb_info.cmap.len)
 347                fb_dealloc_cmap(&dev->fb_info.cmap);
 348
 349        /* Release pseudo palette */
 350        kfree(dev->fb_info.pseudo_palette);
 351        kfree(dev->video_vbase);
 352}
 353
 354/* Initialize the specified card */
 355
 356int vivid_fb_init(struct vivid_dev *dev)
 357{
 358        int ret;
 359
 360        dev->video_buffer_size = MAX_OSD_HEIGHT * MAX_OSD_WIDTH * 2;
 361        dev->video_vbase = kzalloc(dev->video_buffer_size, GFP_KERNEL | GFP_DMA32);
 362        if (dev->video_vbase == NULL)
 363                return -ENOMEM;
 364        dev->video_pbase = virt_to_phys(dev->video_vbase);
 365
 366        pr_info("Framebuffer at 0x%lx, mapped to 0x%p, size %dk\n",
 367                        dev->video_pbase, dev->video_vbase,
 368                        dev->video_buffer_size / 1024);
 369
 370        /* Set the startup video mode information */
 371        ret = vivid_fb_init_vidmode(dev);
 372        if (ret) {
 373                vivid_fb_release_buffers(dev);
 374                return ret;
 375        }
 376
 377        vivid_clear_fb(dev);
 378
 379        /* Register the framebuffer */
 380        if (register_framebuffer(&dev->fb_info) < 0) {
 381                vivid_fb_release_buffers(dev);
 382                return -EINVAL;
 383        }
 384
 385        /* Set the card to the requested mode */
 386        vivid_fb_set_par(&dev->fb_info);
 387        return 0;
 388
 389}
 390