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mraa.c: Find i2c bus by pci id

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Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Brendan Le Foll
2016-10-27 12:48:23 +00:00
parent 23e871c5bb
commit 9d365ce0d6
2 changed files with 53 additions and 0 deletions
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10
include/mraa_internal.h
View File

@@ -149,6 +149,16 @@ int mraa_find_i2c_bus(const char* devname, int startfrom);
*/
mraa_result_t mraa_atoi(char* intStr, int* value);
/**
* helper function to find an i2c bus based on pci data
*
* @param pci_device
* @param pci_id on pci_device
* @param i2c adapter name & number
* @return the matching i2c-dev bus id or -1
*/
int mraa_find_i2c_bus_pci(const char* pci_device, const char *pci_id, const char* adapter_name);
#if defined(IMRAA)
/**
* read Imraa subplatform lock file, caller is responsible to free return

43
src/mraa.c
View File

@@ -928,6 +928,49 @@ mraa_count_i2c_files(const char* path, const struct stat* sb, int flag, struct F
return 0;
}
int
mraa_find_i2c_bus_pci(const char* pci_device, const char *pci_id, const char* adapter_name)
{
/**
* For example we'd get something like:
* pci0000:00/0000:00:16.3/i2c_desiignware.3
*/
char path[1024];
snprintf(path, 1024-1, "/sys/devices/pci%s/%s/%s/", pci_device, pci_id, adapter_name);
if (mraa_file_exist(path)) {
struct dirent **namelist;
int n;
n = scandir(path, &namelist, NULL, alphasort);
if (n < 0) {
syslog(LOG_ERR, "Failed to get information on i2c");
return -1;
}
else {
while (n--) {
char* dup = strdup(namelist[n]->d_name);
const char delim = '-';
char* token;
token = strsep(&dup, &delim);
if (token != NULL) {
if (strncmp("i2c", token, 3) == 0) {
token = strsep(&dup, &delim);
if (token != NULL) {
int ret = -1;
if (mraa_atoi(token, &ret) == MRAA_SUCCESS) {
return ret;
}
return -1;
}
}
}
free(namelist[n]);
}
free(namelist);
}
}
return -1;
}
int
mraa_find_i2c_bus(const char* devname, int startfrom)
{