File: | hw/xfree86/ddc/ddc.c |
Location: | line 187, column 16 |
Description: | Result of 'malloc' is converted to a pointer of type 'unsigned int', which is incompatible with sizeof operand type 'int' |
1 | /* xf86DDC.c |
2 | * |
3 | * Copyright 1998,1999 by Egbert Eich <Egbert.Eich@Physik.TU-Darmstadt.DE> |
4 | */ |
5 | |
6 | /* |
7 | * A note on terminology. DDC1 is the original dumb serial protocol, and |
8 | * can only do up to 128 bytes of EDID. DDC2 is I2C-encapsulated and |
9 | * introduces extension blocks. EDID is the old display identification |
10 | * block, DisplayID is the new one. |
11 | */ |
12 | |
13 | #ifdef HAVE_XORG_CONFIG_H1 |
14 | #include <xorg-config.h> |
15 | #endif |
16 | |
17 | #include "misc.h" |
18 | #include "xf86.h" |
19 | #include "xf86_OSproc.h" |
20 | #include "xf86DDC.h" |
21 | #include <string.h> |
22 | |
23 | #define RETRIES4 4 |
24 | |
25 | typedef enum { |
26 | DDCOPT_NODDC1, |
27 | DDCOPT_NODDC2, |
28 | DDCOPT_NODDC |
29 | } DDCOpts; |
30 | |
31 | static const OptionInfoRec DDCOptions[] = { |
32 | {DDCOPT_NODDC1, "NoDDC1", OPTV_BOOLEAN, {0}, FALSE0}, |
33 | {DDCOPT_NODDC2, "NoDDC2", OPTV_BOOLEAN, {0}, FALSE0}, |
34 | {DDCOPT_NODDC, "NoDDC", OPTV_BOOLEAN, {0}, FALSE0}, |
35 | {-1, NULL((void*)0), OPTV_NONE, {0}, FALSE0}, |
36 | }; |
37 | |
38 | /* DDC1 */ |
39 | |
40 | static int |
41 | find_start(unsigned int *ptr) |
42 | { |
43 | unsigned int comp[9], test[9]; |
44 | int i, j; |
45 | |
46 | for (i = 0; i < 9; i++) { |
47 | comp[i] = *(ptr++); |
48 | test[i] = 1; |
49 | } |
50 | for (i = 0; i < 127; i++) { |
51 | for (j = 0; j < 9; j++) { |
52 | test[j] = test[j] & !(comp[j] ^ *(ptr++)); |
53 | } |
54 | } |
55 | for (i = 0; i < 9; i++) |
56 | if (test[i]) |
57 | return i + 1; |
58 | return -1; |
59 | } |
60 | |
61 | static unsigned char * |
62 | find_header(unsigned char *block) |
63 | { |
64 | unsigned char *ptr, *head_ptr, *end; |
65 | unsigned char header[] = { 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 }; |
66 | |
67 | ptr = block; |
68 | end = block + EDID1_LEN128; |
69 | while (ptr < end) { |
70 | int i; |
71 | |
72 | head_ptr = ptr; |
73 | for (i = 0; i < 8; i++) { |
74 | if (header[i] != *(head_ptr++)) |
75 | break; |
76 | if (head_ptr == end) |
77 | head_ptr = block; |
78 | } |
79 | if (i == 8) |
80 | break; |
81 | ptr++; |
82 | } |
83 | if (ptr == end) |
84 | return NULL((void*)0); |
85 | return ptr; |
86 | } |
87 | |
88 | static unsigned char * |
89 | resort(unsigned char *s_block) |
90 | { |
91 | unsigned char *d_new, *d_ptr, *d_end, *s_ptr, *s_end; |
92 | unsigned char tmp; |
93 | |
94 | s_ptr = find_header(s_block); |
95 | if (!s_ptr) |
96 | return NULL((void*)0); |
97 | s_end = s_block + EDID1_LEN128; |
98 | |
99 | d_new = malloc(EDID1_LEN128); |
100 | if (!d_new) |
101 | return NULL((void*)0); |
102 | d_end = d_new + EDID1_LEN128; |
103 | |
104 | for (d_ptr = d_new; d_ptr < d_end; d_ptr++) { |
105 | tmp = *(s_ptr++); |
106 | *d_ptr = tmp; |
107 | if (s_ptr == s_end) |
108 | s_ptr = s_block; |
109 | } |
110 | free(s_block); |
111 | return d_new; |
112 | } |
113 | |
114 | static int |
115 | DDC_checksum(const unsigned char *block, int len) |
116 | { |
117 | int i, result = 0; |
118 | int not_null = 0; |
119 | |
120 | for (i = 0; i < len; i++) { |
121 | not_null |= block[i]; |
122 | result += block[i]; |
123 | } |
124 | |
125 | #ifdef DEBUG |
126 | if (result & 0xFF) |
127 | ErrorF("DDC checksum not correct\n"); |
128 | if (!not_null) |
129 | ErrorF("DDC read all Null\n"); |
130 | #endif |
131 | |
132 | /* catch the trivial case where all bytes are 0 */ |
133 | if (!not_null) |
134 | return 1; |
135 | |
136 | return result & 0xFF; |
137 | } |
138 | |
139 | static unsigned char * |
140 | GetEDID_DDC1(unsigned int *s_ptr) |
141 | { |
142 | unsigned char *d_block, *d_pos; |
143 | unsigned int *s_pos, *s_end; |
144 | int s_start; |
145 | int i, j; |
146 | |
147 | s_start = find_start(s_ptr); |
148 | if (s_start == -1) |
149 | return NULL((void*)0); |
150 | s_end = s_ptr + NUM9*128; |
151 | s_pos = s_ptr + s_start; |
152 | d_block = malloc(EDID1_LEN128); |
153 | if (!d_block) |
154 | return NULL((void*)0); |
155 | d_pos = d_block; |
156 | for (i = 0; i < EDID1_LEN128; i++) { |
157 | for (j = 0; j < 8; j++) { |
158 | *d_pos <<= 1; |
159 | if (*s_pos) { |
160 | *d_pos |= 0x01; |
161 | } |
162 | s_pos++; |
163 | if (s_pos == s_end) |
164 | s_pos = s_ptr; |
165 | }; |
166 | s_pos++; |
167 | if (s_pos == s_end) |
168 | s_pos = s_ptr; |
169 | d_pos++; |
170 | } |
171 | free(s_ptr); |
172 | if (d_block && DDC_checksum(d_block, EDID1_LEN128)) { |
173 | free(d_block); |
174 | return NULL((void*)0); |
175 | } |
176 | return (resort(d_block)); |
177 | } |
178 | |
179 | /* fetch entire EDID record; DDC bit needs to be masked */ |
180 | static unsigned int * |
181 | FetchEDID_DDC1(register ScrnInfoPtr pScrn, |
182 | register unsigned int (*read_DDC) (ScrnInfoPtr)) |
183 | { |
184 | int count = NUM9*128; |
185 | unsigned int *ptr, *xp; |
186 | |
187 | ptr = xp = malloc(sizeof(int) * NUM9*128); |
Result of 'malloc' is converted to a pointer of type 'unsigned int', which is incompatible with sizeof operand type 'int' | |
188 | |
189 | if (!ptr) |
190 | return NULL((void*)0); |
191 | do { |
192 | /* wait for next retrace */ |
193 | *xp = read_DDC(pScrn); |
194 | xp++; |
195 | } while (--count); |
196 | return ptr; |
197 | } |
198 | |
199 | /* test if DDC1 return 0 if not */ |
200 | static Bool |
201 | TestDDC1(ScrnInfoPtr pScrn, unsigned int (*read_DDC) (ScrnInfoPtr)) |
202 | { |
203 | int old, count; |
204 | |
205 | old = read_DDC(pScrn); |
206 | count = HEADER6 * BITS_PER_BYTE9; |
207 | do { |
208 | /* wait for next retrace */ |
209 | if (old != read_DDC(pScrn)) |
210 | break; |
211 | } while (count--); |
212 | return count; |
213 | } |
214 | |
215 | /* |
216 | * read EDID record , pass it to callback function to interpret. |
217 | * callback function will store it for further use by calling |
218 | * function; it will also decide if we need to reread it |
219 | */ |
220 | static unsigned char * |
221 | EDIDRead_DDC1(ScrnInfoPtr pScrn, DDC1SetSpeedProc DDCSpeed, |
222 | unsigned int (*read_DDC) (ScrnInfoPtr)) |
223 | { |
224 | unsigned char *EDID_block = NULL((void*)0); |
225 | int count = RETRIES4; |
226 | |
227 | if (!read_DDC) { |
228 | xf86DrvMsg(pScrn->scrnIndex, X_PROBED, |
229 | "chipset doesn't support DDC1\n"); |
230 | return NULL((void*)0); |
231 | }; |
232 | |
233 | if (TestDDC1(pScrn, read_DDC) == -1) { |
234 | xf86DrvMsg(pScrn->scrnIndex, X_PROBED, "No DDC signal\n"); |
235 | return NULL((void*)0); |
236 | }; |
237 | |
238 | if (DDCSpeed) |
239 | DDCSpeed(pScrn, DDC_FAST); |
240 | do { |
241 | EDID_block = GetEDID_DDC1(FetchEDID_DDC1(pScrn, read_DDC)); |
242 | count--; |
243 | } while (!EDID_block && count); |
244 | if (DDCSpeed) |
245 | DDCSpeed(pScrn, DDC_SLOW); |
246 | |
247 | return EDID_block; |
248 | } |
249 | |
250 | /** |
251 | * Attempts to probe the monitor for EDID information, if NoDDC and NoDDC1 are |
252 | * unset. EDID information blocks are interpreted and the results returned in |
253 | * an xf86MonPtr. |
254 | * |
255 | * This function does not affect the list of modes used by drivers -- it is up |
256 | * to the driver to decide policy on what to do with EDID information. |
257 | * |
258 | * @return pointer to a new xf86MonPtr containing the EDID information. |
259 | * @return NULL if no monitor attached or failure to interpret the EDID. |
260 | */ |
261 | xf86MonPtr |
262 | xf86DoEDID_DDC1(ScrnInfoPtr pScrn, DDC1SetSpeedProc DDC1SetSpeed, |
263 | unsigned int (*DDC1Read) (ScrnInfoPtr)) |
264 | { |
265 | unsigned char *EDID_block = NULL((void*)0); |
266 | xf86MonPtr tmp = NULL((void*)0); |
267 | |
268 | /* Default DDC and DDC1 to enabled. */ |
269 | Bool noddc = FALSE0, noddc1 = FALSE0; |
270 | OptionInfoPtr options; |
271 | |
272 | options = xnfalloc(sizeof(DDCOptions))XNFalloc((unsigned long)(sizeof(DDCOptions))); |
273 | (void) memcpy(options, DDCOptions, sizeof(DDCOptions))__builtin___memcpy_chk (options, DDCOptions, sizeof(DDCOptions ), __builtin_object_size (options, 0)); |
274 | xf86ProcessOptions(pScrn->scrnIndex, pScrn->options, options); |
275 | |
276 | xf86GetOptValBool(options, DDCOPT_NODDC, &noddc); |
277 | xf86GetOptValBool(options, DDCOPT_NODDC1, &noddc1); |
278 | free(options); |
279 | |
280 | if (noddc || noddc1) |
281 | return NULL((void*)0); |
282 | |
283 | OsBlockSignals(); |
284 | EDID_block = EDIDRead_DDC1(pScrn, DDC1SetSpeed, DDC1Read); |
285 | OsReleaseSignals(); |
286 | |
287 | if (EDID_block) { |
288 | tmp = xf86InterpretEDID(pScrn->scrnIndex, EDID_block); |
289 | } |
290 | #ifdef DEBUG |
291 | else |
292 | ErrorF("No EDID block returned\n"); |
293 | if (!tmp) |
294 | ErrorF("Cannot interpret EDID block\n"); |
295 | #endif |
296 | return tmp; |
297 | } |
298 | |
299 | /* DDC2 */ |
300 | |
301 | static I2CDevPtr |
302 | DDC2MakeDevice(I2CBusPtr pBus, int address, const char *name) |
303 | { |
304 | I2CDevPtr dev = NULL((void*)0); |
305 | |
306 | if (!(dev = xf86I2CFindDev(pBus, address))) { |
307 | dev = xf86CreateI2CDevRec(); |
308 | dev->DevName = name; |
309 | dev->SlaveAddr = address; |
310 | dev->ByteTimeout = 2200; /* VESA DDC spec 3 p. 43 (+10 %) */ |
311 | dev->StartTimeout = 550; |
312 | dev->BitTimeout = 40; |
313 | dev->AcknTimeout = 40; |
314 | |
315 | dev->pI2CBus = pBus; |
316 | if (!xf86I2CDevInit(dev)) { |
317 | xf86DrvMsg(pBus->scrnIndex, X_PROBED, "No DDC2 device\n"); |
318 | return NULL((void*)0); |
319 | } |
320 | } |
321 | |
322 | return dev; |
323 | } |
324 | |
325 | static I2CDevPtr |
326 | DDC2Init(I2CBusPtr pBus) |
327 | { |
328 | I2CDevPtr dev = NULL((void*)0); |
329 | |
330 | /* |
331 | * Slow down the bus so that older monitors don't |
332 | * miss things. |
333 | */ |
334 | pBus->RiseFallTime = 20; |
335 | |
336 | dev = DDC2MakeDevice(pBus, 0x00A0, "ddc2"); |
337 | if (xf86I2CProbeAddress(pBus, 0x0060)) |
338 | DDC2MakeDevice(pBus, 0x0060, "E-EDID segment register"); |
339 | |
340 | return dev; |
341 | } |
342 | |
343 | /* Mmmm, smell the hacks */ |
344 | static void |
345 | EEDIDStop(I2CDevPtr d) |
346 | { |
347 | } |
348 | |
349 | /* block is the EDID block number. a segment is two blocks. */ |
350 | static Bool |
351 | DDC2Read(I2CDevPtr dev, int block, unsigned char *R_Buffer) |
352 | { |
353 | unsigned char W_Buffer[1]; |
354 | int i, segment; |
355 | I2CDevPtr seg; |
356 | void (*stop) (I2CDevPtr); |
357 | |
358 | for (i = 0; i < RETRIES4; i++) { |
359 | /* Stop bits reset the segment pointer to 0, so be careful here. */ |
360 | segment = block >> 1; |
361 | if (segment) { |
362 | Bool b; |
363 | |
364 | if (!(seg = xf86I2CFindDev(dev->pI2CBus, 0x0060))) |
365 | return FALSE0; |
366 | |
367 | W_Buffer[0] = segment; |
368 | |
369 | stop = dev->pI2CBus->I2CStop; |
370 | dev->pI2CBus->I2CStop = EEDIDStop; |
371 | |
372 | b = xf86I2CWriteRead(seg, W_Buffer, 1, NULL((void*)0), 0); |
373 | |
374 | dev->pI2CBus->I2CStop = stop; |
375 | if (!b) { |
376 | dev->pI2CBus->I2CStop(dev); |
377 | continue; |
378 | } |
379 | } |
380 | |
381 | W_Buffer[0] = (block & 0x01) * EDID1_LEN128; |
382 | |
383 | if (xf86I2CWriteRead(dev, W_Buffer, 1, R_Buffer, EDID1_LEN128)) { |
384 | if (!DDC_checksum(R_Buffer, EDID1_LEN128)) |
385 | return TRUE1; |
386 | } |
387 | } |
388 | |
389 | return FALSE0; |
390 | } |
391 | |
392 | /** |
393 | * Attempts to probe the monitor for EDID information, if NoDDC and NoDDC2 are |
394 | * unset. EDID information blocks are interpreted and the results returned in |
395 | * an xf86MonPtr. Unlike xf86DoEDID_DDC[12](), this function will return |
396 | * the complete EDID data, including all extension blocks, if the 'complete' |
397 | * parameter is TRUE; |
398 | * |
399 | * This function does not affect the list of modes used by drivers -- it is up |
400 | * to the driver to decide policy on what to do with EDID information. |
401 | * |
402 | * @return pointer to a new xf86MonPtr containing the EDID information. |
403 | * @return NULL if no monitor attached or failure to interpret the EDID. |
404 | */ |
405 | xf86MonPtr |
406 | xf86DoEEDID(ScrnInfoPtr pScrn, I2CBusPtr pBus, Bool complete) |
407 | { |
408 | unsigned char *EDID_block = NULL((void*)0); |
409 | xf86MonPtr tmp = NULL((void*)0); |
410 | I2CDevPtr dev = NULL((void*)0); |
411 | |
412 | /* Default DDC and DDC2 to enabled. */ |
413 | Bool noddc = FALSE0, noddc2 = FALSE0; |
414 | OptionInfoPtr options; |
415 | |
416 | options = malloc(sizeof(DDCOptions)); |
417 | if (!options) |
418 | return NULL((void*)0); |
419 | memcpy(options, DDCOptions, sizeof(DDCOptions))__builtin___memcpy_chk (options, DDCOptions, sizeof(DDCOptions ), __builtin_object_size (options, 0)); |
420 | xf86ProcessOptions(pScrn->scrnIndex, pScrn->options, options); |
421 | |
422 | xf86GetOptValBool(options, DDCOPT_NODDC, &noddc); |
423 | xf86GetOptValBool(options, DDCOPT_NODDC2, &noddc2); |
424 | free(options); |
425 | |
426 | if (noddc || noddc2) |
427 | return NULL((void*)0); |
428 | |
429 | if (!(dev = DDC2Init(pBus))) |
430 | return NULL((void*)0); |
431 | |
432 | EDID_block = calloc(1, EDID1_LEN128); |
433 | if (!EDID_block) |
434 | return NULL((void*)0); |
435 | |
436 | if (DDC2Read(dev, 0, EDID_block)) { |
437 | int i, n = EDID_block[0x7e]; |
438 | |
439 | if (complete && n) { |
440 | EDID_block = realloc(EDID_block, EDID1_LEN128 * (1 + n)); |
441 | |
442 | for (i = 0; i < n; i++) |
443 | DDC2Read(dev, i + 1, EDID_block + (EDID1_LEN128 * (1 + i))); |
444 | } |
445 | |
446 | tmp = xf86InterpretEEDID(pScrn->scrnIndex, EDID_block); |
447 | } |
448 | |
449 | if (tmp && complete) |
450 | tmp->flags |= MONITOR_EDID_COMPLETE_RAWDATA0x01; |
451 | |
452 | return tmp; |
453 | } |
454 | |
455 | /** |
456 | * Attempts to probe the monitor for EDID information, if NoDDC and NoDDC2 are |
457 | * unset. EDID information blocks are interpreted and the results returned in |
458 | * an xf86MonPtr. |
459 | * |
460 | * This function does not affect the list of modes used by drivers -- it is up |
461 | * to the driver to decide policy on what to do with EDID information. |
462 | * |
463 | * @return pointer to a new xf86MonPtr containing the EDID information. |
464 | * @return NULL if no monitor attached or failure to interpret the EDID. |
465 | */ |
466 | xf86MonPtr |
467 | xf86DoEDID_DDC2(ScrnInfoPtr pScrn, I2CBusPtr pBus) |
468 | { |
469 | return xf86DoEEDID(pScrn, pBus, FALSE0); |
470 | } |