1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 *
4 * Copyright (C) 2005 Mike Isely <isely@pobox.com>
5 */
6
7 #include "pvrusb2-std.h"
8 #include "pvrusb2-debug.h"
9 #include <asm/string.h>
10 #include <linux/slab.h>
11
12 struct std_name {
13 const char *name;
14 v4l2_std_id id;
15 };
16
17
18 #define CSTD_PAL \
19 (V4L2_STD_PAL_B| \
20 V4L2_STD_PAL_B1| \
21 V4L2_STD_PAL_G| \
22 V4L2_STD_PAL_H| \
23 V4L2_STD_PAL_I| \
24 V4L2_STD_PAL_D| \
25 V4L2_STD_PAL_D1| \
26 V4L2_STD_PAL_K| \
27 V4L2_STD_PAL_M| \
28 V4L2_STD_PAL_N| \
29 V4L2_STD_PAL_Nc| \
30 V4L2_STD_PAL_60)
31
32 #define CSTD_NTSC \
33 (V4L2_STD_NTSC_M| \
34 V4L2_STD_NTSC_M_JP| \
35 V4L2_STD_NTSC_M_KR| \
36 V4L2_STD_NTSC_443)
37
38 #define CSTD_ATSC \
39 (V4L2_STD_ATSC_8_VSB| \
40 V4L2_STD_ATSC_16_VSB)
41
42 #define CSTD_SECAM \
43 (V4L2_STD_SECAM_B| \
44 V4L2_STD_SECAM_D| \
45 V4L2_STD_SECAM_G| \
46 V4L2_STD_SECAM_H| \
47 V4L2_STD_SECAM_K| \
48 V4L2_STD_SECAM_K1| \
49 V4L2_STD_SECAM_L| \
50 V4L2_STD_SECAM_LC)
51
52 #define TSTD_B (V4L2_STD_PAL_B|V4L2_STD_SECAM_B)
53 #define TSTD_B1 (V4L2_STD_PAL_B1)
54 #define TSTD_D (V4L2_STD_PAL_D|V4L2_STD_SECAM_D)
55 #define TSTD_D1 (V4L2_STD_PAL_D1)
56 #define TSTD_G (V4L2_STD_PAL_G|V4L2_STD_SECAM_G)
57 #define TSTD_H (V4L2_STD_PAL_H|V4L2_STD_SECAM_H)
58 #define TSTD_I (V4L2_STD_PAL_I)
59 #define TSTD_K (V4L2_STD_PAL_K|V4L2_STD_SECAM_K)
60 #define TSTD_K1 (V4L2_STD_SECAM_K1)
61 #define TSTD_L (V4L2_STD_SECAM_L)
62 #define TSTD_M (V4L2_STD_PAL_M|V4L2_STD_NTSC_M)
63 #define TSTD_N (V4L2_STD_PAL_N)
64 #define TSTD_Nc (V4L2_STD_PAL_Nc)
65 #define TSTD_60 (V4L2_STD_PAL_60)
66
67 #define CSTD_ALL (CSTD_PAL|CSTD_NTSC|CSTD_ATSC|CSTD_SECAM)
68
69 /* Mapping of standard bits to color system */
70 static const struct std_name std_groups[] = {
71 {"PAL",CSTD_PAL},
72 {"NTSC",CSTD_NTSC},
73 {"SECAM",CSTD_SECAM},
74 {"ATSC",CSTD_ATSC},
75 };
76
77 /* Mapping of standard bits to modulation system */
78 static const struct std_name std_items[] = {
79 {"B",TSTD_B},
80 {"B1",TSTD_B1},
81 {"D",TSTD_D},
82 {"D1",TSTD_D1},
83 {"G",TSTD_G},
84 {"H",TSTD_H},
85 {"I",TSTD_I},
86 {"K",TSTD_K},
87 {"K1",TSTD_K1},
88 {"L",TSTD_L},
89 {"LC",V4L2_STD_SECAM_LC},
90 {"M",TSTD_M},
91 {"Mj",V4L2_STD_NTSC_M_JP},
92 {"443",V4L2_STD_NTSC_443},
93 {"Mk",V4L2_STD_NTSC_M_KR},
94 {"N",TSTD_N},
95 {"Nc",TSTD_Nc},
96 {"60",TSTD_60},
97 {"8VSB",V4L2_STD_ATSC_8_VSB},
98 {"16VSB",V4L2_STD_ATSC_16_VSB},
99 };
100
101
102 // Search an array of std_name structures and return a pointer to the
103 // element with the matching name.
find_std_name(const struct std_name * arrPtr,unsigned int arrSize,const char * bufPtr,unsigned int bufSize)104 static const struct std_name *find_std_name(const struct std_name *arrPtr,
105 unsigned int arrSize,
106 const char *bufPtr,
107 unsigned int bufSize)
108 {
109 unsigned int idx;
110 const struct std_name *p;
111 for (idx = 0; idx < arrSize; idx++) {
112 p = arrPtr + idx;
113 if (strlen(p->name) != bufSize) continue;
114 if (!memcmp(bufPtr,p->name,bufSize)) return p;
115 }
116 return NULL;
117 }
118
119
pvr2_std_str_to_id(v4l2_std_id * idPtr,const char * bufPtr,unsigned int bufSize)120 int pvr2_std_str_to_id(v4l2_std_id *idPtr,const char *bufPtr,
121 unsigned int bufSize)
122 {
123 v4l2_std_id id = 0;
124 v4l2_std_id cmsk = 0;
125 v4l2_std_id t;
126 int mMode = 0;
127 unsigned int cnt;
128 char ch;
129 const struct std_name *sp;
130
131 while (bufSize) {
132 if (!mMode) {
133 cnt = 0;
134 while ((cnt < bufSize) && (bufPtr[cnt] != '-')) cnt++;
135 if (cnt >= bufSize) return 0; // No more characters
136 sp = find_std_name(std_groups, ARRAY_SIZE(std_groups),
137 bufPtr,cnt);
138 if (!sp) return 0; // Illegal color system name
139 cnt++;
140 bufPtr += cnt;
141 bufSize -= cnt;
142 mMode = !0;
143 cmsk = sp->id;
144 continue;
145 }
146 cnt = 0;
147 while (cnt < bufSize) {
148 ch = bufPtr[cnt];
149 if (ch == ';') {
150 mMode = 0;
151 break;
152 }
153 if (ch == '/') break;
154 cnt++;
155 }
156 sp = find_std_name(std_items, ARRAY_SIZE(std_items),
157 bufPtr,cnt);
158 if (!sp) return 0; // Illegal modulation system ID
159 t = sp->id & cmsk;
160 if (!t) return 0; // Specific color + modulation system illegal
161 id |= t;
162 if (cnt < bufSize) cnt++;
163 bufPtr += cnt;
164 bufSize -= cnt;
165 }
166
167 if (idPtr) *idPtr = id;
168 return !0;
169 }
170
171
pvr2_std_id_to_str(char * bufPtr,unsigned int bufSize,v4l2_std_id id)172 unsigned int pvr2_std_id_to_str(char *bufPtr, unsigned int bufSize,
173 v4l2_std_id id)
174 {
175 unsigned int idx1,idx2;
176 const struct std_name *ip,*gp;
177 int gfl,cfl;
178 unsigned int c1,c2;
179 cfl = 0;
180 c1 = 0;
181 for (idx1 = 0; idx1 < ARRAY_SIZE(std_groups); idx1++) {
182 gp = std_groups + idx1;
183 gfl = 0;
184 for (idx2 = 0; idx2 < ARRAY_SIZE(std_items); idx2++) {
185 ip = std_items + idx2;
186 if (!(gp->id & ip->id & id)) continue;
187 if (!gfl) {
188 if (cfl) {
189 c2 = scnprintf(bufPtr,bufSize,";");
190 c1 += c2;
191 bufSize -= c2;
192 bufPtr += c2;
193 }
194 cfl = !0;
195 c2 = scnprintf(bufPtr,bufSize,
196 "%s-",gp->name);
197 gfl = !0;
198 } else {
199 c2 = scnprintf(bufPtr,bufSize,"/");
200 }
201 c1 += c2;
202 bufSize -= c2;
203 bufPtr += c2;
204 c2 = scnprintf(bufPtr,bufSize,
205 ip->name);
206 c1 += c2;
207 bufSize -= c2;
208 bufPtr += c2;
209 }
210 }
211 return c1;
212 }
213
214
215 // Template data for possible enumerated video standards. Here we group
216 // standards which share common frame rates and resolution.
217 static struct v4l2_standard generic_standards[] = {
218 {
219 .id = (TSTD_B|TSTD_B1|
220 TSTD_D|TSTD_D1|
221 TSTD_G|
222 TSTD_H|
223 TSTD_I|
224 TSTD_K|TSTD_K1|
225 TSTD_L|
226 V4L2_STD_SECAM_LC |
227 TSTD_N|TSTD_Nc),
228 .frameperiod =
229 {
230 .numerator = 1,
231 .denominator= 25
232 },
233 .framelines = 625,
234 .reserved = {0,0,0,0}
235 }, {
236 .id = (TSTD_M|
237 V4L2_STD_NTSC_M_JP|
238 V4L2_STD_NTSC_M_KR),
239 .frameperiod =
240 {
241 .numerator = 1001,
242 .denominator= 30000
243 },
244 .framelines = 525,
245 .reserved = {0,0,0,0}
246 }, { // This is a total wild guess
247 .id = (TSTD_60),
248 .frameperiod =
249 {
250 .numerator = 1001,
251 .denominator= 30000
252 },
253 .framelines = 525,
254 .reserved = {0,0,0,0}
255 }, { // This is total wild guess
256 .id = V4L2_STD_NTSC_443,
257 .frameperiod =
258 {
259 .numerator = 1001,
260 .denominator= 30000
261 },
262 .framelines = 525,
263 .reserved = {0,0,0,0}
264 }
265 };
266
match_std(v4l2_std_id id)267 static struct v4l2_standard *match_std(v4l2_std_id id)
268 {
269 unsigned int idx;
270 for (idx = 0; idx < ARRAY_SIZE(generic_standards); idx++) {
271 if (generic_standards[idx].id & id) {
272 return generic_standards + idx;
273 }
274 }
275 return NULL;
276 }
277
pvr2_std_fill(struct v4l2_standard * std,v4l2_std_id id)278 static int pvr2_std_fill(struct v4l2_standard *std,v4l2_std_id id)
279 {
280 struct v4l2_standard *template;
281 int idx;
282 unsigned int bcnt;
283 template = match_std(id);
284 if (!template) return 0;
285 idx = std->index;
286 memcpy(std,template,sizeof(*template));
287 std->index = idx;
288 std->id = id;
289 bcnt = pvr2_std_id_to_str(std->name,sizeof(std->name)-1,id);
290 std->name[bcnt] = 0;
291 pvr2_trace(PVR2_TRACE_STD,"Set up standard idx=%u name=%s",
292 std->index,std->name);
293 return !0;
294 }
295
296 /* These are special cases of combined standards that we should enumerate
297 separately if the component pieces are present. */
298 static v4l2_std_id std_mixes[] = {
299 V4L2_STD_PAL_B | V4L2_STD_PAL_G,
300 V4L2_STD_PAL_D | V4L2_STD_PAL_K,
301 V4L2_STD_SECAM_B | V4L2_STD_SECAM_G,
302 V4L2_STD_SECAM_D | V4L2_STD_SECAM_K,
303 };
304
pvr2_std_create_enum(unsigned int * countptr,v4l2_std_id id)305 struct v4l2_standard *pvr2_std_create_enum(unsigned int *countptr,
306 v4l2_std_id id)
307 {
308 unsigned int std_cnt = 0;
309 unsigned int idx,bcnt,idx2;
310 v4l2_std_id idmsk,cmsk,fmsk;
311 struct v4l2_standard *stddefs;
312
313 if (pvrusb2_debug & PVR2_TRACE_STD) {
314 char buf[100];
315 bcnt = pvr2_std_id_to_str(buf,sizeof(buf),id);
316 pvr2_trace(
317 PVR2_TRACE_STD,"Mapping standards mask=0x%x (%.*s)",
318 (int)id,bcnt,buf);
319 }
320
321 *countptr = 0;
322 std_cnt = 0;
323 fmsk = 0;
324 for (idmsk = 1, cmsk = id; cmsk; idmsk <<= 1) {
325 if (!(idmsk & cmsk)) continue;
326 cmsk &= ~idmsk;
327 if (match_std(idmsk)) {
328 std_cnt++;
329 continue;
330 }
331 fmsk |= idmsk;
332 }
333
334 for (idx2 = 0; idx2 < ARRAY_SIZE(std_mixes); idx2++) {
335 if ((id & std_mixes[idx2]) == std_mixes[idx2]) std_cnt++;
336 }
337
338 /* Don't complain about ATSC standard values */
339 fmsk &= ~CSTD_ATSC;
340
341 if (fmsk) {
342 char buf[100];
343 bcnt = pvr2_std_id_to_str(buf,sizeof(buf),fmsk);
344 pvr2_trace(
345 PVR2_TRACE_ERROR_LEGS,
346 "***WARNING*** Failed to classify the following standard(s): %.*s",
347 bcnt,buf);
348 }
349
350 pvr2_trace(PVR2_TRACE_STD,"Setting up %u unique standard(s)",
351 std_cnt);
352 if (!std_cnt) return NULL; // paranoia
353
354 stddefs = kcalloc(std_cnt, sizeof(struct v4l2_standard),
355 GFP_KERNEL);
356 if (!stddefs)
357 return NULL;
358
359 for (idx = 0; idx < std_cnt; idx++)
360 stddefs[idx].index = idx;
361
362 idx = 0;
363
364 /* Enumerate potential special cases */
365 for (idx2 = 0; (idx2 < ARRAY_SIZE(std_mixes)) && (idx < std_cnt);
366 idx2++) {
367 if (!(id & std_mixes[idx2])) continue;
368 if (pvr2_std_fill(stddefs+idx,std_mixes[idx2])) idx++;
369 }
370 /* Now enumerate individual pieces */
371 for (idmsk = 1, cmsk = id; cmsk && (idx < std_cnt); idmsk <<= 1) {
372 if (!(idmsk & cmsk)) continue;
373 cmsk &= ~idmsk;
374 if (!pvr2_std_fill(stddefs+idx,idmsk)) continue;
375 idx++;
376 }
377
378 *countptr = std_cnt;
379 return stddefs;
380 }
381
pvr2_std_get_usable(void)382 v4l2_std_id pvr2_std_get_usable(void)
383 {
384 return CSTD_ALL;
385 }
386