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mraa: add internal mraa_find_i2c_bus function

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Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Brendan Le Foll
2015-07-10 17:52:50 +01:00
parent f5d6a6dc18
commit df0dbb0c73
4 changed files with 123 additions and 81 deletions
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82
src/x86/intel_de3815.c
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@@ -22,7 +22,6 @@
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
@@ -33,7 +32,6 @@
#include "x86/intel_de3815.h"
#define PLATFORM_NAME "Intel DE3815"
#define MAX_SIZE 64
#define SYSFS_CLASS_GPIO "/sys/class/gpio"
#define I2CNAME "designware"
@@ -119,73 +117,25 @@ mraa_intel_de3815()
strncpy(b->pins[17].name, "SMB_SDA", 8);
b->pins[17].capabilites = (mraa_pincapabilities_t){ 1, 0, 0, 0, 0, 0, 0, 0 };
// BUS DEFINITIONS
int fd;
if (mraa_file_exist("/dev/i2c-0")) {
b->i2c_bus_count = 2;
int i = 0;
int suc = 0;
for (i = 0; i < 9; i++) {
off_t size, err;
char path[MAX_SIZE];
char value[MAX_SIZE];
snprintf(path, MAX_SIZE, "/sys/class/i2c-dev/i2c-%u/name", i);
fd = open(path, O_RDONLY);
if (fd < 0) {
break;
}
size = lseek(fd, 0, SEEK_END);
if (size < 0) {
syslog(LOG_WARNING, "mraa: failed to seek i2c filename file");
close(fd);
break;
}
err = lseek(fd, 0, SEEK_SET);
if (err < 0) {
syslog(LOG_WARNING, "mraa: failed to seek i2c filename file");
close(fd);
break;
}
if (size >= MAX_SIZE) {
syslog(LOG_NOTICE, "mraa: i2c filename file too big, skipping");
close(fd);
break;
}
ssize_t r = read(fd, value, size);
if (r > 0) {
if (strcasestr(value, I2CNAME) != NULL) {
suc = 1;
b->i2c_bus_count = 2;
b->def_i2c_bus = 0;
b->i2c_bus[0].bus_id = i;
b->i2c_bus[0].sda = 12;
b->i2c_bus[0].scl = 13;
b->i2c_bus[1].bus_id = i + 1;
b->i2c_bus[1].sda = 14;
b->i2c_bus[1].scl = 15;
close(fd);
break;
}
} else {
syslog(LOG_ERR, "mraa: sysfs i2cdev failed");
close(fd);
break;
}
close(fd);
b->i2c_bus_count = 0;
int i2c_num = -1;
int i;
for (i = 0; i < 2; i++) {
i2c_num = mraa_find_i2c_bus(I2CNAME, i2c_num + 1);
if (i2c_num == -1) {
break;
}
if (!suc) {
syslog(LOG_WARNING, "mraa: no i2c-dev detected, load i2c-dev");
b->i2c_bus_count = 0;
b->def_i2c_bus = 0;
}
} else {
syslog(LOG_WARNING, "mraa: no i2c-dev detected, load i2c-dev");
b->i2c_bus_count = 0;
b->def_i2c_bus = 0;
b->i2c_bus_count++;
b->i2c_bus[i].bus_id = i2c_num;
b->i2c_bus[i].sda = 12 + i;
b->i2c_bus[i].scl = 13 + i;
}
if (b->i2c_bus_count > 0) {
b->def_i2c_bus = b->i2c_bus[0].bus_id;
}
b->spi_bus_count = 1;
b->def_spi_bus = 0;
b->spi_bus[0].bus_id = 1;