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 */ 38 static const u16 rgb555[16] = { 39 0x7fff, 0x7fe0, 0x03ff, 0x03e0, 0x7c1f, 0x7c00, 0x001f, 0x0000, 40 0xffff, 0xffe0, 0x83ff, 0x83e0, 0xfc1f, 0xfc00, 0x801f, 0x8000 41 }; 42 43 static const u16 rgb565[16] = { 44 0xffff, 0xffe0, 0x07ff, 0x07e0, 0xf81f, 0xf800, 0x001f, 0x0000, 45 0xffff, 0xffe0, 0x07ff, 0x07e0, 0xf81f, 0xf800, 0x001f, 0x0000 46 }; 47 48 unsigned int vivid_fb_green_bits(struct vivid_dev *dev) 49 { 50 return dev->fb_defined.green.length; 51 } 52 53 void vivid_fb_clear(struct vivid_dev *dev) 54 { 55 void *p = dev->video_vbase; 56 const u16 *rgb = rgb555; 57 unsigned x, y; 58 59 if (vivid_fb_green_bits(dev) == 6) 60 rgb = rgb565; 61 62 for (y = 0; y < dev->display_height; y++) { 63 u16 *d = p; 64 65 for (x = 0; x < dev->display_width; x++) 66 d[x] = rgb[(y / 16 + x / 16) % 16]; 67 p += dev->display_byte_stride; 68 } 69 } 70 71 /* --------------------------------------------------------------------- */ 72 73 static int vivid_fb_ioctl(struct fb_info *info, unsigned cmd, unsigned long arg) 74 { 75 struct vivid_dev *dev = (struct vivid_dev *)info->par; 76 77 switch (cmd) { 78 case FBIOGET_VBLANK: { 79 struct fb_vblank vblank; 80 81 memset(&vblank, 0, sizeof(vblank)); 82 vblank.flags = FB_VBLANK_HAVE_COUNT | FB_VBLANK_HAVE_VCOUNT | 83 FB_VBLANK_HAVE_VSYNC; 84 vblank.count = 0; 85 vblank.vcount = 0; 86 vblank.hcount = 0; 87 if (copy_to_user((void __user *)arg, &vblank, sizeof(vblank))) 88 return -EFAULT; 89 return 0; 90 } 91 92 default: 93 dprintk(dev, 1, "Unknown ioctl %08x\n", cmd); 94 return -EINVAL; 95 } 96 return 0; 97 } 98 99 /* Framebuffer device handling */ 100 101 static int vivid_fb_set_var(struct vivid_dev *dev, struct fb_var_screeninfo *var) 102 { 103 dprintk(dev, 1, "vivid_fb_set_var\n"); 104 105 if (var->bits_per_pixel != 16) { 106 dprintk(dev, 1, "vivid_fb_set_var - Invalid bpp\n"); 107 return -EINVAL; 108 } 109 dev->display_byte_stride = var->xres * dev->bytes_per_pixel; 110 111 return 0; 112 } 113 114 static int vivid_fb_get_fix(struct vivid_dev *dev, struct fb_fix_screeninfo *fix) 115 { 116 dprintk(dev, 1, "vivid_fb_get_fix\n"); 117 memset(fix, 0, sizeof(struct fb_fix_screeninfo)); 118 strscpy(fix->id, "vioverlay fb", sizeof(fix->id)); 119 fix->smem_start = dev->video_pbase; 120 fix->smem_len = dev->video_buffer_size; 121 fix->type = FB_TYPE_PACKED_PIXELS; 122 fix->visual = FB_VISUAL_TRUECOLOR; 123 fix->xpanstep = 1; 124 fix->ypanstep = 1; 125 fix->ywrapstep = 0; 126 fix->line_length = dev->display_byte_stride; 127 fix->accel = FB_ACCEL_NONE; 128 return 0; 129 } 130 131 /* Check the requested display mode, returning -EINVAL if we can't 132 handle it. */ 133 134 static int _vivid_fb_check_var(struct fb_var_screeninfo *var, struct vivid_dev *dev) 135 { 136 dprintk(dev, 1, "vivid_fb_check_var\n"); 137 138 var->bits_per_pixel = 16; 139 if (var->green.length == 5) { 140 var->red.offset = 10; 141 var->red.length = 5; 142 var->green.offset = 5; 143 var->green.length = 5; 144 var->blue.offset = 0; 145 var->blue.length = 5; 146 var->transp.offset = 15; 147 var->transp.length = 1; 148 } else { 149 var->red.offset = 11; 150 var->red.length = 5; 151 var->green.offset = 5; 152 var->green.length = 6; 153 var->blue.offset = 0; 154 var->blue.length = 5; 155 var->transp.offset = 0; 156 var->transp.length = 0; 157 } 158 var->xoffset = var->yoffset = 0; 159 var->left_margin = var->upper_margin = 0; 160 var->nonstd = 0; 161 162 var->vmode &= ~FB_VMODE_MASK; 163 var->vmode |= FB_VMODE_NONINTERLACED; 164 165 /* Dummy values */ 166 var->hsync_len = 24; 167 var->vsync_len = 2; 168 var->pixclock = 84316; 169 var->right_margin = 776; 170 var->lower_margin = 591; 171 return 0; 172 } 173 174 static int vivid_fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 175 { 176 struct vivid_dev *dev = (struct vivid_dev *) info->par; 177 178 dprintk(dev, 1, "vivid_fb_check_var\n"); 179 return _vivid_fb_check_var(var, dev); 180 } 181 182 static int vivid_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info) 183 { 184 return 0; 185 } 186 187 static int vivid_fb_set_par(struct fb_info *info) 188 { 189 int rc = 0; 190 struct vivid_dev *dev = (struct vivid_dev *) info->par; 191 192 dprintk(dev, 1, "vivid_fb_set_par\n"); 193 194 rc = vivid_fb_set_var(dev, &info->var); 195 vivid_fb_get_fix(dev, &info->fix); 196 return rc; 197 } 198 199 static int vivid_fb_setcolreg(unsigned regno, unsigned red, unsigned green, 200 unsigned blue, unsigned transp, 201 struct fb_info *info) 202 { 203 u32 color, *palette; 204 205 if (regno >= info->cmap.len) 206 return -EINVAL; 207 208 color = ((transp & 0xFF00) << 16) | ((red & 0xFF00) << 8) | 209 (green & 0xFF00) | ((blue & 0xFF00) >> 8); 210 if (regno >= 16) 211 return -EINVAL; 212 213 palette = info->pseudo_palette; 214 if (info->var.bits_per_pixel == 16) { 215 switch (info->var.green.length) { 216 case 6: 217 color = (red & 0xf800) | 218 ((green & 0xfc00) >> 5) | 219 ((blue & 0xf800) >> 11); 220 break; 221 case 5: 222 color = ((red & 0xf800) >> 1) | 223 ((green & 0xf800) >> 6) | 224 ((blue & 0xf800) >> 11) | 225 (transp ? 0x8000 : 0); 226 break; 227 } 228 } 229 palette[regno] = color; 230 return 0; 231 } 232 233 /* We don't really support blanking. All this does is enable or 234 disable the OSD. */ 235 static int vivid_fb_blank(int blank_mode, struct fb_info *info) 236 { 237 struct vivid_dev *dev = (struct vivid_dev *)info->par; 238 239 dprintk(dev, 1, "Set blanking mode : %d\n", blank_mode); 240 switch (blank_mode) { 241 case FB_BLANK_UNBLANK: 242 break; 243 case FB_BLANK_NORMAL: 244 case FB_BLANK_HSYNC_SUSPEND: 245 case FB_BLANK_VSYNC_SUSPEND: 246 case FB_BLANK_POWERDOWN: 247 break; 248 } 249 return 0; 250 } 251 252 static const struct fb_ops vivid_fb_ops = { 253 .owner = THIS_MODULE, 254 FB_DEFAULT_IOMEM_OPS, 255 .fb_check_var = vivid_fb_check_var, 256 .fb_set_par = vivid_fb_set_par, 257 .fb_setcolreg = vivid_fb_setcolreg, 258 .fb_cursor = NULL, 259 .fb_ioctl = vivid_fb_ioctl, 260 .fb_pan_display = vivid_fb_pan_display, 261 .fb_blank = vivid_fb_blank, 262 }; 263 264 /* Initialization */ 265 266 267 /* Setup our initial video mode */ 268 static int vivid_fb_init_vidmode(struct vivid_dev *dev) 269 { 270 struct v4l2_rect start_window; 271 272 /* Color mode */ 273 274 dev->bits_per_pixel = 16; 275 dev->bytes_per_pixel = dev->bits_per_pixel / 8; 276 277 start_window.width = MAX_OSD_WIDTH; 278 start_window.left = 0; 279 280 dev->display_byte_stride = start_window.width * dev->bytes_per_pixel; 281 282 /* Vertical size & position */ 283 284 start_window.height = MAX_OSD_HEIGHT; 285 start_window.top = 0; 286 287 dev->display_width = start_window.width; 288 dev->display_height = start_window.height; 289 290 /* Generate a valid fb_var_screeninfo */ 291 292 dev->fb_defined.xres = dev->display_width; 293 dev->fb_defined.yres = dev->display_height; 294 dev->fb_defined.xres_virtual = dev->display_width; 295 dev->fb_defined.yres_virtual = dev->display_height; 296 dev->fb_defined.bits_per_pixel = dev->bits_per_pixel; 297 dev->fb_defined.vmode = FB_VMODE_NONINTERLACED; 298 dev->fb_defined.left_margin = start_window.left + 1; 299 dev->fb_defined.upper_margin = start_window.top + 1; 300 dev->fb_defined.accel_flags = FB_ACCEL_NONE; 301 dev->fb_defined.nonstd = 0; 302 /* set default to 1:5:5:5 */ 303 dev->fb_defined.green.length = 5; 304 305 /* We've filled in the most data, let the usual mode check 306 routine fill in the rest. */ 307 _vivid_fb_check_var(&dev->fb_defined, dev); 308 309 /* Generate valid fb_fix_screeninfo */ 310 311 vivid_fb_get_fix(dev, &dev->fb_fix); 312 313 /* Generate valid fb_info */ 314 315 dev->fb_info.node = -1; 316 dev->fb_info.par = dev; 317 dev->fb_info.var = dev->fb_defined; 318 dev->fb_info.fix = dev->fb_fix; 319 dev->fb_info.screen_base = (u8 __iomem *)dev->video_vbase; 320 dev->fb_info.fbops = &vivid_fb_ops; 321 322 /* Supply some monitor specs. Bogus values will do for now */ 323 dev->fb_info.monspecs.hfmin = 8000; 324 dev->fb_info.monspecs.hfmax = 70000; 325 dev->fb_info.monspecs.vfmin = 10; 326 dev->fb_info.monspecs.vfmax = 100; 327 328 /* Allocate color map */ 329 if (fb_alloc_cmap(&dev->fb_info.cmap, 256, 1)) { 330 pr_err("abort, unable to alloc cmap\n"); 331 return -ENOMEM; 332 } 333 334 /* Allocate the pseudo palette */ 335 dev->fb_info.pseudo_palette = kmalloc_array(16, sizeof(u32), GFP_KERNEL); 336 337 return dev->fb_info.pseudo_palette ? 0 : -ENOMEM; 338 } 339 340 /* Release any memory we've grabbed */ 341 static void vivid_fb_release_buffers(struct vivid_dev *dev) 342 { 343 if (dev->video_vbase == NULL) 344 return; 345 346 /* Release cmap */ 347 if (dev->fb_info.cmap.len) 348 fb_dealloc_cmap(&dev->fb_info.cmap); 349 350 /* Release pseudo palette */ 351 kfree(dev->fb_info.pseudo_palette); 352 kfree(dev->video_vbase); 353 } 354 355 /* Initialize the specified card */ 356 357 int vivid_fb_init(struct vivid_dev *dev) 358 { 359 int ret; 360 361 dev->video_buffer_size = MAX_OSD_HEIGHT * MAX_OSD_WIDTH * 2; 362 dev->video_vbase = kzalloc(dev->video_buffer_size, GFP_KERNEL); 363 if (dev->video_vbase == NULL) 364 return -ENOMEM; 365 dev->video_pbase = virt_to_phys(dev->video_vbase); 366 367 pr_info("Framebuffer at 0x%lx, mapped to 0x%p, size %dk\n", 368 dev->video_pbase, dev->video_vbase, 369 dev->video_buffer_size / 1024); 370 371 /* Set the startup video mode information */ 372 ret = vivid_fb_init_vidmode(dev); 373 if (ret) { 374 vivid_fb_release_buffers(dev); 375 return ret; 376 } 377 378 vivid_fb_clear(dev); 379 380 /* Register the framebuffer */ 381 if (register_framebuffer(&dev->fb_info) < 0) { 382 vivid_fb_release_buffers(dev); 383 return -EINVAL; 384 } 385 386 /* Set the card to the requested mode */ 387 vivid_fb_set_par(&dev->fb_info); 388 389 v4l2_info(&dev->v4l2_dev, "Framebuffer device registered as fb%d\n", 390 dev->fb_info.node); 391 392 return 0; 393 394 } 395 396 void vivid_fb_deinit(struct vivid_dev *dev) 397 { 398 v4l2_info(&dev->v4l2_dev, "unregistering fb%d\n", dev->fb_info.node); 399 unregister_framebuffer(&dev->fb_info); 400 vivid_fb_release_buffers(dev); 401 } 402