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intel_edison_fab_c.c: Fix frequency setting on edison r2 images

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This reworks the mraa_intel_edison_i2c_freq() function. i2c_dw_sysnode is a
folder not a file so we need to grab the mode file from that folder. We now
also support i2c-1 frequency changing

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Brendan Le Foll
2015-03-01 17:15:19 +00:00
parent 2c74ba72a7
commit 677af126aa
1 changed files with 38 additions and 25 deletions
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63
src/x86/intel_edison_fab_c.c
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@@ -674,33 +674,46 @@ mraa_intel_edison_mmap_setup(mraa_gpio_context dev, mraa_boolean_t en)
mraa_result_t
mraa_intel_edison_i2c_freq(mraa_i2c_context dev, mraa_i2c_mode_t mode)
{
if (dev->busnum == 6) {
int sysnode = open("/sys/devices/pci0000:00/0000:00:09.1/i2c_dw_sysnode", O_RDWR);
if (sysnode == -1) {
return MRAA_ERROR_INVALID_RESOURCE;
}
int sysnode = -1;
char bu[5];
int length;
switch (mode) {
case MRAA_I2C_STD:
length = snprintf(bu, sizeof(bu), "std");
break;
case MRAA_I2C_FAST:
length = snprintf(bu, sizeof(bu), "fast");
break;
case MRAA_I2C_HIGH:
length = snprintf(bu, sizeof(bu), "high");
break;
}
if (write(sysnode, bu, length*sizeof(char)) == -1) {
close(sysnode);
return MRAA_ERROR_INVALID_RESOURCE;
}
close(sysnode);
return MRAA_SUCCESS;
switch (dev->busnum) {
case 1:
sysnode = open("/sys/devices/pci0000:00/0000:00:08.0/i2c_dw_sysnode/mode", O_RDWR);
break;
case 6:
sysnode = open("/sys/devices/pci0000:00/0000:00:09.1/i2c_dw_sysnode/mode", O_RDWR);
break;
default:
syslog(LOG_NOTICE, "i2c bus selected does not support frequency changes");
return MRAA_ERROR_FEATURE_NOT_SUPPORTED;
}
return MRAA_ERROR_FEATURE_NOT_SUPPORTED;
if (sysnode == -1) {
return MRAA_ERROR_INVALID_RESOURCE;
}
char bu[5];
int length;
switch (mode) {
case MRAA_I2C_STD:
length = snprintf(bu, sizeof(bu), "std");
break;
case MRAA_I2C_FAST:
length = snprintf(bu, sizeof(bu), "fast");
break;
case MRAA_I2C_HIGH:
length = snprintf(bu, sizeof(bu), "high");
break;
default:
syslog(LOG_ERR, "Invalid i2c mode selected");
close(sysnode);
return MRAA_ERROR_INVALID_PARAMETER;
}
if (write(sysnode, bu, length*sizeof(char)) == -1) {
close(sysnode);
return MRAA_ERROR_INVALID_RESOURCE;
}
close(sysnode);
return MRAA_SUCCESS;
}
mraa_result_t