void polly_copyFromHostToDevice(void *HostData, PollyGPUDevicePtr *DevData,
long MemSize) {
dump_function();
CUdeviceptr CuDevData = DevData->Cuda;
CuMemcpyHtoDFcnPtr(CuDevData, HostData, MemSize);
}
void polly_copyFromDeviceToHost(PollyGPUDevicePtr *DevData, void *HostData,
long MemSize) {
dump_function();
if (CuMemcpyDtoHFcnPtr(HostData, DevData->Cuda, MemSize) != CUDA_SUCCESS) {
fprintf(stdout, "Copying results from device to host memory failed.\n");
exit(-1);
}
}
void polly_freeKernel(PollyGPUFunction *Kernel) {
dump_function();
if (Kernel->CudaModule)
CuModuleUnloadFcnPtr(Kernel->CudaModule);
if (Kernel)
free(Kernel);
}
void
java_genericize (tree fndecl)
{
dump_java_tree (TDI_original, fndecl);
/* Genericize with the gimplifier. */
gimplify_function_tree (fndecl);
dump_function (TDI_generic, fndecl);
}
void polly_freeContext(PollyGPUContext *Context) {
dump_function();
if (Context->Cuda) {
CuCtxDestroyFcnPtr(Context->Cuda);
free(Context);
}
dlclose(HandleCuda);
dlclose(HandleCudaRT);
}
static void
dump_transaction_entry( void dump_function( const char *format, ... ), const transaction_entry *entry ) {
assert( entry != NULL );
assert( dump_function != NULL );
dump_function( "Transaction entry %p: xid = %#x, barrier_xid = %#x, original_xid = %#x, datapath_id = %#" PRIx64 ", message = %p, "
"message data = %p, message length = %u, succeeded_callback = %p, succeeded_user_data = %p, failed_callback =%p, "
"failed_user_data = %p, expires_at = %d.%09d, completed = %d, error_received = %d, timeout = %d.",
entry, entry->xid, entry->barrier_xid, entry->original_xid, entry->datapath_id, entry->message,
entry->message != NULL ? entry->message->data : NULL, entry->message != NULL ? entry->message->length : 0,
entry->succeeded_callback, entry->succeeded_user_data, entry->failed_callback, entry->failed_user_data,
( int ) entry->expires_at.tv_sec, ( int ) entry->expires_at.tv_nsec, entry->completed,
entry->error_received, entry->timeout );
}
PollyGPUContext *polly_initContext() {
DebugMode = getenv("POLLY_DEBUG") != 0;
dump_function();
PollyGPUContext *Context;
CUdevice Device;
int Major = 0, Minor = 0, DeviceID = 0;
char DeviceName[256];
int DeviceCount = 0;
/* Get API handles. */
if (initialDeviceAPIs() == 0) {
fprintf(stdout, "Getting the \"handle\" for the CUDA driver API failed.\n");
exit(-1);
}
if (CuInitFcnPtr(0) != CUDA_SUCCESS) {
fprintf(stdout, "Initializing the CUDA driver API failed.\n");
exit(-1);
}
/* Get number of devices that supports CUDA. */
CuDeviceGetCountFcnPtr(&DeviceCount);
if (DeviceCount == 0) {
fprintf(stdout, "There is no device supporting CUDA.\n");
exit(-1);
}
CuDeviceGetFcnPtr(&Device, 0);
/* Get compute capabilities and the device name. */
CuDeviceComputeCapabilityFcnPtr(&Major, &Minor, Device);
CuDeviceGetNameFcnPtr(DeviceName, 256, Device);
debug_print("> Running on GPU device %d : %s.\n", DeviceID, DeviceName);
/* Create context on the device. */
Context = (PollyGPUContext *)malloc(sizeof(PollyGPUContext));
if (Context == 0) {
fprintf(stdout, "Allocate memory for Polly GPU context failed.\n");
exit(-1);
}
CuCtxCreateFcnPtr(&(Context->Cuda), 0, Device);
return Context;
}
static void compile(const char *input)
{
ktap_closure *cl;
char *buff;
struct stat sb;
int fdin;
if (oneline_src[0] != '\0') {
init_dummy_global_state();
cl = ktapc_parser(oneline_src, input);
goto dump;
}
fdin = open(input, O_RDONLY);
if (fdin < 0) {
fprintf(stderr, "open file %s failed\n", input);
exit(-1);
}
if (fstat(fdin, &sb) == -1)
handle_error("fstat failed");
buff = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fdin, 0);
if (buff == MAP_FAILED)
handle_error("mmap failed");
init_dummy_global_state();
cl = ktapc_parser(buff, input);
munmap(buff, sb.st_size);
close(fdin);
dump:
if (dump_bytecode) {
dump_function(1, cl->p);
exit(0);
}
/* ktapc output */
uparm.trunk = malloc(ktap_trunk_mem_size);
if (!uparm.trunk)
handle_error("malloc failed");
ktapc_dump(cl->p, ktapc_writer, NULL, 0);
}
void
c_genericize (tree fndecl)
{
FILE *dump_file;
int local_dump_flags;
struct cgraph_node *cgn;
/* Dump the C-specific tree IR. */
dump_file = dump_begin (TDI_original, &local_dump_flags);
if (dump_file)
{
fprintf (dump_file, "\n;; Function %s",
lang_hooks.decl_printable_name (fndecl, 2));
fprintf (dump_file, " (%s)\n",
IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
fprintf (dump_file, ";; enabled by -%s\n", dump_flag_name (TDI_original));
fprintf (dump_file, "\n");
if (local_dump_flags & TDF_RAW)
dump_node (DECL_SAVED_TREE (fndecl),
TDF_SLIM | local_dump_flags, dump_file);
else
print_c_tree (dump_file, DECL_SAVED_TREE (fndecl));
fprintf (dump_file, "\n");
dump_end (TDI_original, dump_file);
}
/* Go ahead and gimplify for now. */
push_context ();
gimplify_function_tree (fndecl);
pop_context ();
/* Dump the genericized tree IR. */
dump_function (TDI_generic, fndecl);
/* Genericize all nested functions now. We do things in this order so
that items like VLA sizes are expanded properly in the context of
the correct function. */
cgn = cgraph_node (fndecl);
for (cgn = cgn->nested; cgn ; cgn = cgn->next_nested)
c_genericize (cgn->decl);
}
PollyGPUDevicePtr *polly_allocateMemoryForDevice(long MemSize) {
dump_function();
PollyGPUDevicePtr *DevData = malloc(sizeof(PollyGPUDevicePtr));
if (DevData == 0) {
fprintf(stdout, "Allocate memory for GPU device memory pointer failed.\n");
exit(-1);
}
CUresult Res = CuMemAllocFcnPtr(&(DevData->Cuda), MemSize);
if (Res != CUDA_SUCCESS) {
fprintf(stdout, "Allocate memory for GPU device memory pointer failed.\n");
exit(-1);
}
return DevData;
}
void polly_launchKernel(PollyGPUFunction *Kernel, unsigned int GridDimX,
unsigned int GridDimY, unsigned int BlockDimX,
unsigned int BlockDimY, unsigned int BlockDimZ,
void **Parameters) {
dump_function();
unsigned GridDimZ = 1;
unsigned int SharedMemBytes = CU_SHARED_MEM_CONFIG_DEFAULT_BANK_SIZE;
CUstream Stream = 0;
void **Extra = 0;
CUresult Res;
Res = CuLaunchKernelFcnPtr(Kernel->Cuda, GridDimX, GridDimY, GridDimZ,
BlockDimX, BlockDimY, BlockDimZ, SharedMemBytes,
Stream, Parameters, Extra);
if (Res != CUDA_SUCCESS) {
fprintf(stdout, "Launching CUDA kernel failed.\n");
exit(-1);
}
}
/* this is a debug function used for check bytecode chunk file */
static void dump_function(int level, ktap_proto *f)
{
int i;
printf("\n----------------------------------------------------\n");
printf("function %d [level %d]:\n", function_nr++, level);
printf("linedefined: %d\n", f->linedefined);
printf("lastlinedefined: %d\n", f->lastlinedefined);
printf("numparams: %d\n", f->numparams);
printf("is_vararg: %d\n", f->is_vararg);
printf("maxstacksize: %d\n", f->maxstacksize);
printf("source: %s\n", getstr(f->source));
printf("sizelineinfo: %d \t", f->sizelineinfo);
for (i = 0; i < f->sizelineinfo; i++)
printf("%d ", f->lineinfo[i]);
printf("\n");
printf("sizek: %d\n", f->sizek);
for (i = 0; i < f->sizek; i++) {
switch(f->k[i].type) {
case KTAP_TNIL:
printf("\tNIL\n");
break;
case KTAP_TBOOLEAN:
printf("\tBOOLEAN: ");
printf("%d\n", f->k[i].val.b);
break;
case KTAP_TNUMBER:
printf("\tTNUMBER: ");
printf("%ld\n", f->k[i].val.n);
break;
case KTAP_TSHRSTR:
case KTAP_TLNGSTR:
printf("\tTSTRING: ");
printf("%s\n", svalue(&(f->k[i])));
break;
default:
printf("\tUnknow constant type %d: ", f->k[i].type);
kp_showobj(NULL, &(f->k[i]));
printf("\n");
}
}
printf("sizelocvars: %d\n", f->sizelocvars);
for (i = 0; i < f->sizelocvars; i++) {
printf("\tlocvars: %s startpc: %d endpc: %d\n",
getstr(f->locvars[i].varname), f->locvars[i].startpc,
f->locvars[i].endpc);
}
printf("sizeupvalues: %d\n", f->sizeupvalues);
for (i = 0; i < f->sizeupvalues; i++) {
printf("\tname: %s instack: %d idx: %d\n",
getstr(f->upvalues[i].name), f->upvalues[i].instack,
f->upvalues[i].idx);
}
printf("\n");
printf("sizecode: %d\n", f->sizecode);
for (i = 0; i < f->sizecode; i++)
decode_instruction(f, f->code[i]);
printf("sizep: %d\n", f->sizep);
for (i = 0; i < f->sizep; i++)
dump_function(level + 1, f->p[i]);
}
void *polly_getDevicePtr(PollyGPUDevicePtr *Allocation) {
dump_function();
return (void *)Allocation->Cuda;
}
void polly_freeDeviceMemory(PollyGPUDevicePtr *Allocation) {
dump_function();
CuMemFreeFcnPtr((CUdeviceptr)Allocation->Cuda);
free(Allocation);
}
PollyGPUFunction *polly_getKernel(const char *PTXBuffer,
const char *KernelName) {
dump_function();
PollyGPUFunction *Function = malloc(sizeof(PollyGPUFunction));
if (Function == 0) {
fprintf(stdout, "Allocate memory for Polly GPU function failed.\n");
exit(-1);
}
CUresult Res;
CUlinkState LState;
CUjit_option Options[6];
void *OptionVals[6];
float Walltime = 0;
unsigned long LogSize = 8192;
char ErrorLog[8192], InfoLog[8192];
void *CuOut;
size_t OutSize;
// Setup linker options
// Return walltime from JIT compilation
Options[0] = CU_JIT_WALL_TIME;
OptionVals[0] = (void *)&Walltime;
// Pass a buffer for info messages
Options[1] = CU_JIT_INFO_LOG_BUFFER;
OptionVals[1] = (void *)InfoLog;
// Pass the size of the info buffer
Options[2] = CU_JIT_INFO_LOG_BUFFER_SIZE_BYTES;
OptionVals[2] = (void *)LogSize;
// Pass a buffer for error message
Options[3] = CU_JIT_ERROR_LOG_BUFFER;
OptionVals[3] = (void *)ErrorLog;
// Pass the size of the error buffer
Options[4] = CU_JIT_ERROR_LOG_BUFFER_SIZE_BYTES;
OptionVals[4] = (void *)LogSize;
// Make the linker verbose
Options[5] = CU_JIT_LOG_VERBOSE;
OptionVals[5] = (void *)1;
memset(ErrorLog, 0, sizeof(ErrorLog));
CuLinkCreateFcnPtr(6, Options, OptionVals, &LState);
Res = CuLinkAddDataFcnPtr(LState, CU_JIT_INPUT_PTX, (void *)PTXBuffer,
strlen(PTXBuffer) + 1, 0, 0, 0, 0);
if (Res != CUDA_SUCCESS) {
fprintf(stdout, "PTX Linker Error:\n%s\n%s", ErrorLog, InfoLog);
exit(-1);
}
Res = CuLinkCompleteFcnPtr(LState, &CuOut, &OutSize);
if (Res != CUDA_SUCCESS) {
fprintf(stdout, "Complete ptx linker step failed.\n");
fprintf(stdout, "\n%s\n", ErrorLog);
exit(-1);
}
debug_print("CUDA Link Completed in %fms. Linker Output:\n%s\n", Walltime,
InfoLog);
Res = CuModuleLoadDataFcnPtr(&(Function->CudaModule), CuOut);
if (Res != CUDA_SUCCESS) {
fprintf(stdout, "Loading ptx assembly text failed.\n");
exit(-1);
}
Res = CuModuleGetFunctionFcnPtr(&(Function->Cuda), Function->CudaModule,
KernelName);
if (Res != CUDA_SUCCESS) {
fprintf(stdout, "Loading kernel function failed.\n");
exit(-1);
}
CuLinkDestroyFcnPtr(LState);
return Function;
}
int main(int argc, char *argv[])
{
int ret = 0, len, ofs;
unsigned int i, scan_size = 0, cnt = 0;
unsigned long buf_size;
void *map = NULL;
a4l_desc_t dsc = { .sbdata = NULL };
int (*dump_function) (a4l_desc_t *, a4l_cmd_t*, unsigned char *, int) =
dump_text;
/* Compute arguments */
while ((ret = getopt_long(argc,
argv,
"vrd:s:S:c:mwk:h",
cmd_read_opts, NULL)) >= 0) {
switch (ret) {
case 'v':
verbose = 1;
break;
case 'r':
real_time = 1;
break;
case 'd':
filename = optarg;
break;
case 's':
cmd.idx_subd = strtoul(optarg, NULL, 0);
break;
case 'S':
cmd.stop_arg = strtoul(optarg, NULL, 0);
break;
case 'c':
str_chans = optarg;
break;
case 'm':
use_mmap = 1;
break;
case 'w':
dump_function = dump_raw;
break;
case 'k':
wake_count = strtoul(optarg, NULL, 0);
break;
case 'h':
default:
do_print_usage();
return 0;
}
}
if (isatty(STDOUT_FILENO) && dump_function == dump_raw) {
fprintf(stderr,
"cmd_read: cannot dump raw data on a terminal\n\n");
return -EINVAL;
}
/* Recover the channels to compute */
do {
cmd.nb_chan++;
len = strlen(str_chans);
ofs = strcspn(str_chans, ",");
if (sscanf(str_chans, "%u", &chans[cmd.nb_chan - 1]) == 0) {
fprintf(stderr, "cmd_read: bad channel argument\n");
return -EINVAL;
}
str_chans += ofs + 1;
} while (len != ofs);
/* Update the command structure */
cmd.scan_end_arg = cmd.nb_chan;
cmd.stop_src = cmd.stop_arg != 0 ? TRIG_COUNT : TRIG_NONE;
if (real_time != 0) {
if (verbose != 0)
printf("cmd_read: switching to real-time mode\n");
/* Prevent any memory-swapping for this program */
ret = mlockall(MCL_CURRENT | MCL_FUTURE);
if (ret < 0) {
ret = errno;
fprintf(stderr, "cmd_read: mlockall failed (ret=%d)\n",
ret);
goto out_main;
}
/* Turn the current process into an RT task */
ret = rt_task_shadow(&rt_task_desc, NULL, 1, 0);
if (ret < 0) {
fprintf(stderr,
"cmd_read: rt_task_shadow failed (ret=%d)\n",
ret);
goto out_main;
}
}
/* Open the device */
ret = a4l_open(&dsc, filename);
if (ret < 0) {
fprintf(stderr, "cmd_read: a4l_open %s failed (ret=%d)\n",
filename, ret);
return ret;
}
if (verbose != 0) {
printf("cmd_read: device %s opened (fd=%d)\n",
filename, dsc.fd);
printf("cmd_read: basic descriptor retrieved\n");
printf("\t subdevices count = %d\n", dsc.nb_subd);
printf("\t read subdevice index = %d\n", dsc.idx_read_subd);
printf("\t write subdevice index = %d\n", dsc.idx_write_subd);
}
/* Allocate a buffer so as to get more info (subd, chan, rng) */
dsc.sbdata = malloc(dsc.sbsize);
if (dsc.sbdata == NULL) {
fprintf(stderr, "cmd_read: malloc failed \n");
return -ENOMEM;
}
/* Get this data */
ret = a4l_fill_desc(&dsc);
if (ret < 0) {
fprintf(stderr,
"cmd_read: a4l_fill_desc failed (ret=%d)\n", ret);
goto out_main;
}
if (verbose != 0)
printf("cmd_read: complex descriptor retrieved\n");
/* Get the size of a single acquisition */
for (i = 0; i < cmd.nb_chan; i++) {
a4l_chinfo_t *info;
ret = a4l_get_chinfo(&dsc,
cmd.idx_subd, cmd.chan_descs[i], &info);
if (ret < 0) {
fprintf(stderr,
"cmd_read: a4l_get_chinfo failed (ret=%d)\n",
ret);
goto out_main;
}
if (verbose != 0) {
printf("cmd_read: channel %x\n", cmd.chan_descs[i]);
printf("\t ranges count = %d\n", info->nb_rng);
printf("\t bit width = %d (bits)\n", info->nb_bits);
}
scan_size += a4l_sizeof_chan(info);
}
if (verbose != 0) {
printf("cmd_read: scan size = %u\n", scan_size);
if (cmd.stop_arg != 0)
printf("cmd_read: size to read = %u\n",
scan_size * cmd.stop_arg);
}
/* Cancel any former command which might be in progress */
a4l_snd_cancel(&dsc, cmd.idx_subd);
if (use_mmap != 0) {
/* Get the buffer size to map */
ret = a4l_get_bufsize(&dsc, cmd.idx_subd, &buf_size);
if (ret < 0) {
fprintf(stderr,
"cmd_read: a4l_get_bufsize() failed (ret=%d)\n",
ret);
goto out_main;
}
if (verbose != 0)
printf("cmd_read: buffer size = %lu bytes\n", buf_size);
/* Map the analog input subdevice buffer */
ret = a4l_mmap(&dsc, cmd.idx_subd, buf_size, &map);
if (ret < 0) {
fprintf(stderr,
"cmd_read: a4l_mmap() failed (ret=%d)\n",
ret);
goto out_main;
}
if (verbose != 0)
printf
("cmd_read: mmap performed successfully (map=0x%p)\n",
map);
}
ret = a4l_set_wakesize(&dsc, wake_count);
if (ret < 0) {
fprintf(stderr,
"cmd_read: a4l_set_wakesize failed (ret=%d)\n", ret);
goto out_main;
}
if (verbose != 0)
printf("cmd_read: wake size successfully set (%lu)\n",
wake_count);
/* Send the command to the input device */
ret = a4l_snd_command(&dsc, &cmd);
if (ret < 0) {
fprintf(stderr,
"cmd_read: a4l_snd_command failed (ret=%d)\n", ret);
goto out_main;
}
if (verbose != 0)
printf("cmd_read: command successfully sent\n");
if (use_mmap == 0) {
/* Fetch data */
do {
/* Perform the read operation */
ret = a4l_async_read(&dsc, buf, BUF_SIZE, A4L_INFINITE);
if (ret < 0) {
fprintf(stderr,
"cmd_read: a4l_read failed (ret=%d)\n",
ret);
goto out_main;
}
/* Display the results */
if (dump_function(&dsc, &cmd, buf, ret) < 0) {
ret = -EIO;
goto out_main;
}
/* Update the counter */
cnt += ret;
} while (ret > 0);
} else {
unsigned long front = 0;
/* Fetch data without any memcpy */
do {
/* Retrieve and update the buffer's state
(In input case, we recover how many bytes are available
to read) */
ret = a4l_mark_bufrw(&dsc, cmd.idx_subd, front, &front);
if (ret == -ENOENT)
break;
else if (ret < 0) {
fprintf(stderr,
"cmd_read: a4l_mark_bufrw() failed (ret=%d)\n",
ret);
goto out_main;
}
/* If there is nothing to read, wait for an event
(Note that a4l_poll() also retrieves the data amount
to read; in our case it is useless as we have to update
the data read counter) */
if (front == 0) {
ret = a4l_poll(&dsc, cmd.idx_subd, A4L_INFINITE);
if (ret == 0)
break;
else if (ret < 0) {
fprintf(stderr,
"cmd_read: a4l_poll() failed (ret=%d)\n",
ret);
goto out_main;
}
}
/* Display the results */
if (dump_function(&dsc,
&cmd,
&((unsigned char *)map)[cnt % buf_size],
front) < 0) {
ret = -EIO;
goto out_main;
}
/* Update the counter */
cnt += front;
} while (1);
}
if (verbose != 0)
printf("cmd_read: %d bytes successfully received\n", cnt);
ret = 0;
out_main:
if (use_mmap != 0)
/* Clean the pages table */
munmap(map, buf_size);
/* Free the buffer used as device descriptor */
if (dsc.sbdata != NULL)
free(dsc.sbdata);
/* Release the file descriptor */
a4l_close(&dsc);
return ret;
}
int main(int argc, char *argv[])
{
int err = 0;
unsigned int cnt = 0;
a4l_desc_t dsc = { .sbdata = NULL };
a4l_sbinfo_t *sbinfo;
a4l_chinfo_t *chinfo;
a4l_rnginfo_t *rnginfo;
int (*dump_function) (a4l_desc_t *, unsigned char *, int) = dump_text;
/* Compute arguments */
while ((err = getopt_long(argc,
argv,
"vrd:s:S:c:R:y:wh", insn_read_opts,
NULL)) >= 0) {
switch (err) {
case 'v':
verbose = 1;
break;
case 'd':
filename = optarg;
break;
case 's':
idx_subd = strtoul(optarg, NULL, 0);
break;
case 'S':
scan_size = strtoul(optarg, NULL, 0);
break;
case 'c':
idx_chan = strtoul(optarg, NULL, 0);
break;
case 'R':
idx_rng = strtoul(optarg, NULL, 0);
dump_function = dump_converted;
break;
case 'w':
dump_function = dump_raw;
break;
case 'y':
dump_function = dump_calibrated;
calibration_file = optarg;
break;
case 'h':
default:
do_print_usage();
return 0;
}
}
if (isatty(STDOUT_FILENO) && dump_function == dump_raw) {
fprintf(stderr,
"insn_read: cannot dump raw data on a terminal\n\n");
return -EINVAL;
}
/* Open the device */
err = a4l_open(&dsc, filename);
if (err < 0) {
fprintf(stderr,
"insn_read: a4l_open %s failed (err=%d)\n",
filename, err);
return err;
}
if (verbose != 0) {
printf("insn_read: device %s opened (fd=%d)\n", filename,
dsc.fd);
printf("insn_read: basic descriptor retrieved\n");
printf("\t subdevices count = %d\n", dsc.nb_subd);
printf("\t read subdevice index = %d\n", dsc.idx_read_subd);
printf("\t write subdevice index = %d\n", dsc.idx_write_subd);
}
/* Allocate a buffer so as to get more info (subd, chan, rng) */
dsc.sbdata = malloc(dsc.sbsize);
if (dsc.sbdata == NULL) {
err = -ENOMEM;
fprintf(stderr, "insn_read: info buffer allocation failed\n");
goto out_insn_read;
}
/* Get this data */
err = a4l_fill_desc(&dsc);
if (err < 0) {
fprintf(stderr, "insn_read: a4l_fill_desc failed (err=%d)\n",
err);
goto out_insn_read;
}
if (verbose != 0)
printf("insn_read: complex descriptor retrieved\n");
/* If no subdevice index was set, look for an analog input
subdevice */
if (idx_subd == -1)
idx_subd = dsc.idx_read_subd;
if (idx_subd == -1) {
fprintf(stderr,
"insn_read: no analog input subdevice available\n");
err = -EINVAL;
goto out_insn_read;
}
if (verbose != 0)
printf("insn_read: selected subdevice index = %d\n", idx_subd);
/* We must check that the subdevice is really an AI one
(in case, the subdevice index was set with the option -s) */
err = a4l_get_subdinfo(&dsc, idx_subd, &sbinfo);
if (err < 0) {
fprintf(stderr,
"insn_read: get_sbinfo(%d) failed (err = %d)\n",
idx_subd, err);
err = -EINVAL;
goto out_insn_read;
}
if ((sbinfo->flags & A4L_SUBD_TYPES) != A4L_SUBD_AI) {
fprintf(stderr,
"insn_read: wrong subdevice selected "
"(not an analog input)\n");
err = -EINVAL;
goto out_insn_read;
}
if (idx_rng >= 0) {
err = a4l_get_rnginfo(&dsc,
idx_subd, idx_chan, idx_rng, &rnginfo);
if (err < 0) {
fprintf(stderr,
"insn_read: failed to recover range descriptor\n");
goto out_insn_read;
}
if (verbose != 0) {
printf("insn_read: range descriptor retrieved\n");
printf("\t min = %ld\n", rnginfo->min);
printf("\t max = %ld\n", rnginfo->max);
}
}
/* Retrieve the subdevice data size */
err = a4l_get_chinfo(&dsc, idx_subd, idx_chan, &chinfo);
if (err < 0) {
fprintf(stderr,
"insn_read: info for channel %d on subdevice %d not available (err=%d)\n",
idx_chan, idx_subd, err);
goto out_insn_read;
}
/* Set the data size to read */
scan_size *= a4l_sizeof_chan(chinfo);
if (verbose != 0) {
printf("insn_read: channel width is %u bits\n",
chinfo->nb_bits);
printf("insn_read: global scan size is %u\n", scan_size);
}
while (cnt < scan_size) {
int tmp = (scan_size - cnt) < BUF_SIZE ?
(scan_size - cnt) : BUF_SIZE;
/* Perform the synchronous read */
err = a4l_sync_read(&dsc,
idx_subd, CHAN(idx_chan), 0, buf, tmp);
if (err < 0) {
fprintf(stderr,
"insn_read: a4l_sync_read failed (err=%d)\n",
err);
goto out_insn_read;
}
/* Dump the read data */
tmp = dump_function(&dsc, buf, err);
if (tmp < 0) {
err = tmp;
goto out_insn_read;
}
/* Update the count */
cnt += err;
}
if (verbose != 0)
printf("insn_read: %u bytes successfully received\n", cnt);
err = 0;
out_insn_read:
/* Free the information buffer */
if (dsc.sbdata != NULL)
free(dsc.sbdata);
/* Release the file descriptor */
a4l_close(&dsc);
return err;
}