1 /*
2 * vivid-osd.c - osd support for testing overlays.
3 *
4 * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
5 *
6 * This program is free software; you may redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
11 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
12 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
13 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
14 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
15 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
16 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17 * SOFTWARE.
18 */
19
20 #include <linux/module.h>
21 #include <linux/errno.h>
22 #include <linux/kernel.h>
23 #include <linux/init.h>
24 #include <linux/sched.h>
25 #include <linux/slab.h>
26 #include <linux/font.h>
27 #include <linux/mutex.h>
28 #include <linux/videodev2.h>
29 #include <linux/kthread.h>
30 #include <linux/freezer.h>
31 #include <linux/fb.h>
32 #include <media/videobuf2-vmalloc.h>
33 #include <media/v4l2-device.h>
34 #include <media/v4l2-ioctl.h>
35 #include <media/v4l2-ctrls.h>
36 #include <media/v4l2-fh.h>
37 #include <media/v4l2-event.h>
38 #include <media/v4l2-common.h>
39
40 #include "vivid-core.h"
41 #include "vivid-osd.h"
42
43 #define MAX_OSD_WIDTH 720
44 #define MAX_OSD_HEIGHT 576
45
46 /*
47 * Order: white, yellow, cyan, green, magenta, red, blue, black,
48 * and same again with the alpha bit set (if any)
49 */
50 static const u16 rgb555[16] = {
51 0x7fff, 0x7fe0, 0x03ff, 0x03e0, 0x7c1f, 0x7c00, 0x001f, 0x0000,
52 0xffff, 0xffe0, 0x83ff, 0x83e0, 0xfc1f, 0xfc00, 0x801f, 0x8000
53 };
54
55 static const u16 rgb565[16] = {
56 0xffff, 0xffe0, 0x07ff, 0x07e0, 0xf81f, 0xf800, 0x001f, 0x0000,
57 0xffff, 0xffe0, 0x07ff, 0x07e0, 0xf81f, 0xf800, 0x001f, 0x0000
58 };
59
vivid_clear_fb(struct vivid_dev * dev)60 void vivid_clear_fb(struct vivid_dev *dev)
61 {
62 void *p = dev->video_vbase;
63 const u16 *rgb = rgb555;
64 unsigned x, y;
65
66 if (dev->fb_defined.green.length == 6)
67 rgb = rgb565;
68
69 for (y = 0; y < dev->display_height; y++) {
70 u16 *d = p;
71
72 for (x = 0; x < dev->display_width; x++)
73 d[x] = rgb[(y / 16 + x / 16) % 16];
74 p += dev->display_byte_stride;
75 }
76 }
77
78 /* --------------------------------------------------------------------- */
79
vivid_fb_ioctl(struct fb_info * info,unsigned cmd,unsigned long arg)80 static int vivid_fb_ioctl(struct fb_info *info, unsigned cmd, unsigned long arg)
81 {
82 struct vivid_dev *dev = (struct vivid_dev *)info->par;
83
84 switch (cmd) {
85 case FBIOGET_VBLANK: {
86 struct fb_vblank vblank;
87
88 memset(&vblank, 0, sizeof(vblank));
89 vblank.flags = FB_VBLANK_HAVE_COUNT | FB_VBLANK_HAVE_VCOUNT |
90 FB_VBLANK_HAVE_VSYNC;
91 vblank.count = 0;
92 vblank.vcount = 0;
93 vblank.hcount = 0;
94 if (copy_to_user((void __user *)arg, &vblank, sizeof(vblank)))
95 return -EFAULT;
96 return 0;
97 }
98
99 default:
100 dprintk(dev, 1, "Unknown ioctl %08x\n", cmd);
101 return -EINVAL;
102 }
103 return 0;
104 }
105
106 /* Framebuffer device handling */
107
vivid_fb_set_var(struct vivid_dev * dev,struct fb_var_screeninfo * var)108 static int vivid_fb_set_var(struct vivid_dev *dev, struct fb_var_screeninfo *var)
109 {
110 dprintk(dev, 1, "vivid_fb_set_var\n");
111
112 if (var->bits_per_pixel != 16) {
113 dprintk(dev, 1, "vivid_fb_set_var - Invalid bpp\n");
114 return -EINVAL;
115 }
116 dev->display_byte_stride = var->xres * dev->bytes_per_pixel;
117
118 return 0;
119 }
120
vivid_fb_get_fix(struct vivid_dev * dev,struct fb_fix_screeninfo * fix)121 static int vivid_fb_get_fix(struct vivid_dev *dev, struct fb_fix_screeninfo *fix)
122 {
123 dprintk(dev, 1, "vivid_fb_get_fix\n");
124 memset(fix, 0, sizeof(struct fb_fix_screeninfo));
125 strlcpy(fix->id, "vioverlay fb", sizeof(fix->id));
126 fix->smem_start = dev->video_pbase;
127 fix->smem_len = dev->video_buffer_size;
128 fix->type = FB_TYPE_PACKED_PIXELS;
129 fix->visual = FB_VISUAL_TRUECOLOR;
130 fix->xpanstep = 1;
131 fix->ypanstep = 1;
132 fix->ywrapstep = 0;
133 fix->line_length = dev->display_byte_stride;
134 fix->accel = FB_ACCEL_NONE;
135 return 0;
136 }
137
138 /* Check the requested display mode, returning -EINVAL if we can't
139 handle it. */
140
_vivid_fb_check_var(struct fb_var_screeninfo * var,struct vivid_dev * dev)141 static int _vivid_fb_check_var(struct fb_var_screeninfo *var, struct vivid_dev *dev)
142 {
143 dprintk(dev, 1, "vivid_fb_check_var\n");
144
145 var->bits_per_pixel = 16;
146 if (var->green.length == 5) {
147 var->red.offset = 10;
148 var->red.length = 5;
149 var->green.offset = 5;
150 var->green.length = 5;
151 var->blue.offset = 0;
152 var->blue.length = 5;
153 var->transp.offset = 15;
154 var->transp.length = 1;
155 } else {
156 var->red.offset = 11;
157 var->red.length = 5;
158 var->green.offset = 5;
159 var->green.length = 6;
160 var->blue.offset = 0;
161 var->blue.length = 5;
162 var->transp.offset = 0;
163 var->transp.length = 0;
164 }
165 var->xoffset = var->yoffset = 0;
166 var->left_margin = var->upper_margin = 0;
167 var->nonstd = 0;
168
169 var->vmode &= ~FB_VMODE_MASK;
170 var->vmode = FB_VMODE_NONINTERLACED;
171
172 /* Dummy values */
173 var->hsync_len = 24;
174 var->vsync_len = 2;
175 var->pixclock = 84316;
176 var->right_margin = 776;
177 var->lower_margin = 591;
178 return 0;
179 }
180
vivid_fb_check_var(struct fb_var_screeninfo * var,struct fb_info * info)181 static int vivid_fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
182 {
183 struct vivid_dev *dev = (struct vivid_dev *) info->par;
184
185 dprintk(dev, 1, "vivid_fb_check_var\n");
186 return _vivid_fb_check_var(var, dev);
187 }
188
vivid_fb_pan_display(struct fb_var_screeninfo * var,struct fb_info * info)189 static int vivid_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
190 {
191 return 0;
192 }
193
vivid_fb_set_par(struct fb_info * info)194 static int vivid_fb_set_par(struct fb_info *info)
195 {
196 int rc = 0;
197 struct vivid_dev *dev = (struct vivid_dev *) info->par;
198
199 dprintk(dev, 1, "vivid_fb_set_par\n");
200
201 rc = vivid_fb_set_var(dev, &info->var);
202 vivid_fb_get_fix(dev, &info->fix);
203 return rc;
204 }
205
vivid_fb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)206 static int vivid_fb_setcolreg(unsigned regno, unsigned red, unsigned green,
207 unsigned blue, unsigned transp,
208 struct fb_info *info)
209 {
210 u32 color, *palette;
211
212 if (regno >= info->cmap.len)
213 return -EINVAL;
214
215 color = ((transp & 0xFF00) << 16) | ((red & 0xFF00) << 8) |
216 (green & 0xFF00) | ((blue & 0xFF00) >> 8);
217 if (regno >= 16)
218 return -EINVAL;
219
220 palette = info->pseudo_palette;
221 if (info->var.bits_per_pixel == 16) {
222 switch (info->var.green.length) {
223 case 6:
224 color = (red & 0xf800) |
225 ((green & 0xfc00) >> 5) |
226 ((blue & 0xf800) >> 11);
227 break;
228 case 5:
229 color = ((red & 0xf800) >> 1) |
230 ((green & 0xf800) >> 6) |
231 ((blue & 0xf800) >> 11) |
232 (transp ? 0x8000 : 0);
233 break;
234 }
235 }
236 palette[regno] = color;
237 return 0;
238 }
239
240 /* We don't really support blanking. All this does is enable or
241 disable the OSD. */
vivid_fb_blank(int blank_mode,struct fb_info * info)242 static int vivid_fb_blank(int blank_mode, struct fb_info *info)
243 {
244 struct vivid_dev *dev = (struct vivid_dev *)info->par;
245
246 dprintk(dev, 1, "Set blanking mode : %d\n", blank_mode);
247 switch (blank_mode) {
248 case FB_BLANK_UNBLANK:
249 break;
250 case FB_BLANK_NORMAL:
251 case FB_BLANK_HSYNC_SUSPEND:
252 case FB_BLANK_VSYNC_SUSPEND:
253 case FB_BLANK_POWERDOWN:
254 break;
255 }
256 return 0;
257 }
258
259 static struct fb_ops vivid_fb_ops = {
260 .owner = THIS_MODULE,
261 .fb_check_var = vivid_fb_check_var,
262 .fb_set_par = vivid_fb_set_par,
263 .fb_setcolreg = vivid_fb_setcolreg,
264 .fb_fillrect = cfb_fillrect,
265 .fb_copyarea = cfb_copyarea,
266 .fb_imageblit = cfb_imageblit,
267 .fb_cursor = NULL,
268 .fb_ioctl = vivid_fb_ioctl,
269 .fb_pan_display = vivid_fb_pan_display,
270 .fb_blank = vivid_fb_blank,
271 };
272
273 /* Initialization */
274
275
276 /* Setup our initial video mode */
vivid_fb_init_vidmode(struct vivid_dev * dev)277 static int vivid_fb_init_vidmode(struct vivid_dev *dev)
278 {
279 struct v4l2_rect start_window;
280
281 /* Color mode */
282
283 dev->bits_per_pixel = 16;
284 dev->bytes_per_pixel = dev->bits_per_pixel / 8;
285
286 start_window.width = MAX_OSD_WIDTH;
287 start_window.left = 0;
288
289 dev->display_byte_stride = start_window.width * dev->bytes_per_pixel;
290
291 /* Vertical size & position */
292
293 start_window.height = MAX_OSD_HEIGHT;
294 start_window.top = 0;
295
296 dev->display_width = start_window.width;
297 dev->display_height = start_window.height;
298
299 /* Generate a valid fb_var_screeninfo */
300
301 dev->fb_defined.xres = dev->display_width;
302 dev->fb_defined.yres = dev->display_height;
303 dev->fb_defined.xres_virtual = dev->display_width;
304 dev->fb_defined.yres_virtual = dev->display_height;
305 dev->fb_defined.bits_per_pixel = dev->bits_per_pixel;
306 dev->fb_defined.vmode = FB_VMODE_NONINTERLACED;
307 dev->fb_defined.left_margin = start_window.left + 1;
308 dev->fb_defined.upper_margin = start_window.top + 1;
309 dev->fb_defined.accel_flags = FB_ACCEL_NONE;
310 dev->fb_defined.nonstd = 0;
311 /* set default to 1:5:5:5 */
312 dev->fb_defined.green.length = 5;
313
314 /* We've filled in the most data, let the usual mode check
315 routine fill in the rest. */
316 _vivid_fb_check_var(&dev->fb_defined, dev);
317
318 /* Generate valid fb_fix_screeninfo */
319
320 vivid_fb_get_fix(dev, &dev->fb_fix);
321
322 /* Generate valid fb_info */
323
324 dev->fb_info.node = -1;
325 dev->fb_info.flags = FBINFO_FLAG_DEFAULT;
326 dev->fb_info.fbops = &vivid_fb_ops;
327 dev->fb_info.par = dev;
328 dev->fb_info.var = dev->fb_defined;
329 dev->fb_info.fix = dev->fb_fix;
330 dev->fb_info.screen_base = (u8 __iomem *)dev->video_vbase;
331 dev->fb_info.fbops = &vivid_fb_ops;
332
333 /* Supply some monitor specs. Bogus values will do for now */
334 dev->fb_info.monspecs.hfmin = 8000;
335 dev->fb_info.monspecs.hfmax = 70000;
336 dev->fb_info.monspecs.vfmin = 10;
337 dev->fb_info.monspecs.vfmax = 100;
338
339 /* Allocate color map */
340 if (fb_alloc_cmap(&dev->fb_info.cmap, 256, 1)) {
341 pr_err("abort, unable to alloc cmap\n");
342 return -ENOMEM;
343 }
344
345 /* Allocate the pseudo palette */
346 dev->fb_info.pseudo_palette = kmalloc_array(16, sizeof(u32), GFP_KERNEL);
347
348 return dev->fb_info.pseudo_palette ? 0 : -ENOMEM;
349 }
350
351 /* Release any memory we've grabbed */
vivid_fb_release_buffers(struct vivid_dev * dev)352 void vivid_fb_release_buffers(struct vivid_dev *dev)
353 {
354 if (dev->video_vbase == NULL)
355 return;
356
357 /* Release cmap */
358 if (dev->fb_info.cmap.len)
359 fb_dealloc_cmap(&dev->fb_info.cmap);
360
361 /* Release pseudo palette */
362 kfree(dev->fb_info.pseudo_palette);
363 kfree((void *)dev->video_vbase);
364 }
365
366 /* Initialize the specified card */
367
vivid_fb_init(struct vivid_dev * dev)368 int vivid_fb_init(struct vivid_dev *dev)
369 {
370 int ret;
371
372 dev->video_buffer_size = MAX_OSD_HEIGHT * MAX_OSD_WIDTH * 2;
373 dev->video_vbase = kzalloc(dev->video_buffer_size, GFP_KERNEL | GFP_DMA32);
374 if (dev->video_vbase == NULL)
375 return -ENOMEM;
376 dev->video_pbase = virt_to_phys(dev->video_vbase);
377
378 pr_info("Framebuffer at 0x%lx, mapped to 0x%p, size %dk\n",
379 dev->video_pbase, dev->video_vbase,
380 dev->video_buffer_size / 1024);
381
382 /* Set the startup video mode information */
383 ret = vivid_fb_init_vidmode(dev);
384 if (ret) {
385 vivid_fb_release_buffers(dev);
386 return ret;
387 }
388
389 vivid_clear_fb(dev);
390
391 /* Register the framebuffer */
392 if (register_framebuffer(&dev->fb_info) < 0) {
393 vivid_fb_release_buffers(dev);
394 return -EINVAL;
395 }
396
397 /* Set the card to the requested mode */
398 vivid_fb_set_par(&dev->fb_info);
399 return 0;
400
401 }
402