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
vivid_clear_fb(struct vivid_dev * dev)48 void 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
vivid_fb_ioctl(struct fb_info * info,unsigned cmd,unsigned long arg)68 static 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
vivid_fb_set_var(struct vivid_dev * dev,struct fb_var_screeninfo * var)96 static 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
vivid_fb_get_fix(struct vivid_dev * dev,struct fb_fix_screeninfo * fix)109 static 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
_vivid_fb_check_var(struct fb_var_screeninfo * var,struct vivid_dev * dev)129 static 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
vivid_fb_check_var(struct fb_var_screeninfo * var,struct fb_info * info)169 static 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
vivid_fb_pan_display(struct fb_var_screeninfo * var,struct fb_info * info)177 static int vivid_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
178 {
179 return 0;
180 }
181
vivid_fb_set_par(struct fb_info * info)182 static 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
vivid_fb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)194 static 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. */
vivid_fb_blank(int blank_mode,struct fb_info * info)230 static 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
247 static const 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 */
vivid_fb_init_vidmode(struct vivid_dev * dev)265 static 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.par = dev;
315 dev->fb_info.var = dev->fb_defined;
316 dev->fb_info.fix = dev->fb_fix;
317 dev->fb_info.screen_base = (u8 __iomem *)dev->video_vbase;
318 dev->fb_info.fbops = &vivid_fb_ops;
319
320 /* Supply some monitor specs. Bogus values will do for now */
321 dev->fb_info.monspecs.hfmin = 8000;
322 dev->fb_info.monspecs.hfmax = 70000;
323 dev->fb_info.monspecs.vfmin = 10;
324 dev->fb_info.monspecs.vfmax = 100;
325
326 /* Allocate color map */
327 if (fb_alloc_cmap(&dev->fb_info.cmap, 256, 1)) {
328 pr_err("abort, unable to alloc cmap\n");
329 return -ENOMEM;
330 }
331
332 /* Allocate the pseudo palette */
333 dev->fb_info.pseudo_palette = kmalloc_array(16, sizeof(u32), GFP_KERNEL);
334
335 return dev->fb_info.pseudo_palette ? 0 : -ENOMEM;
336 }
337
338 /* Release any memory we've grabbed */
vivid_fb_release_buffers(struct vivid_dev * dev)339 void vivid_fb_release_buffers(struct vivid_dev *dev)
340 {
341 if (dev->video_vbase == NULL)
342 return;
343
344 /* Release cmap */
345 if (dev->fb_info.cmap.len)
346 fb_dealloc_cmap(&dev->fb_info.cmap);
347
348 /* Release pseudo palette */
349 kfree(dev->fb_info.pseudo_palette);
350 kfree(dev->video_vbase);
351 }
352
353 /* Initialize the specified card */
354
vivid_fb_init(struct vivid_dev * dev)355 int vivid_fb_init(struct vivid_dev *dev)
356 {
357 int ret;
358
359 dev->video_buffer_size = MAX_OSD_HEIGHT * MAX_OSD_WIDTH * 2;
360 dev->video_vbase = kzalloc(dev->video_buffer_size, GFP_KERNEL);
361 if (dev->video_vbase == NULL)
362 return -ENOMEM;
363 dev->video_pbase = virt_to_phys(dev->video_vbase);
364
365 pr_info("Framebuffer at 0x%lx, mapped to 0x%p, size %dk\n",
366 dev->video_pbase, dev->video_vbase,
367 dev->video_buffer_size / 1024);
368
369 /* Set the startup video mode information */
370 ret = vivid_fb_init_vidmode(dev);
371 if (ret) {
372 vivid_fb_release_buffers(dev);
373 return ret;
374 }
375
376 vivid_clear_fb(dev);
377
378 /* Register the framebuffer */
379 if (register_framebuffer(&dev->fb_info) < 0) {
380 vivid_fb_release_buffers(dev);
381 return -EINVAL;
382 }
383
384 /* Set the card to the requested mode */
385 vivid_fb_set_par(&dev->fb_info);
386 return 0;
387
388 }
389