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x86: de3815: detect correct i2c-dev

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Will search for the designware i2c devices
Closes #198
Closes #203

Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>
This commit is contained in:
Thomas Ingleby
2015-06-30 14:33:22 +01:00
parent b8b5c935a2
commit 5ccd7a675f
1 changed files with 49 additions and 8 deletions
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57
src/x86/intel_de3815.c
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@@ -22,8 +22,12 @@
* 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>
#include <sys/stat.h>
#include <fcntl.h>
#include "common.h"
#include "x86/intel_de3815.h"
@@ -31,6 +35,7 @@
#define PLATFORM_NAME "Intel DE3815"
#define MAX_SIZE 64
#define SYSFS_CLASS_GPIO "/sys/class/gpio"
#define I2CNAME "designware"
mraa_board_t*
mraa_intel_de3815()
@@ -115,15 +120,51 @@ mraa_intel_de3815()
b->pins[17].capabilites = (mraa_pincapabilities_t){ 1, 0, 0, 0, 0, 0, 0, 0 };
// BUS DEFINITIONS
b->i2c_bus_count = 2;
b->def_i2c_bus = 0;
b->i2c_bus[0].bus_id = 0;
b->i2c_bus[0].sda = 12;
b->i2c_bus[0].scl = 13;
int fd;
if (mraa_file_exist("/dev/i2c-0")) {
b->i2c_bus_count = 2;
int i = 0;
int suc = 0;
for (i = 0; i < 8; i++) {
char path[MAX_SIZE];
snprintf(path, MAX_SIZE, "/sys/class/i2c-dev/i2c-%u/name", i);
fd = open(path, O_RDONLY);
off_t size = lseek(fd, 0, SEEK_END);
char value[MAX_SIZE];
lseek(fd, 0, SEEK_SET);
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 = 1;
b->i2c_bus[1].sda = 14;
b->i2c_bus[1].scl = 15;
b->i2c_bus[1].bus_id = i+1;
b->i2c_bus[1].sda = 14;
b->i2c_bus[1].scl = 15;
break;
}
} else {
syslog(LOG_ERR, "mraa: sysfs i2cdev failed");
break;
}
close(fd);
}
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;
}
close(fd);
b->spi_bus_count = 1;
b->def_spi_bus = 0;