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Fix i2c detection on Linux.

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Signed-off-by: Thomas Rohloff <v10lator@myway.de>
This commit is contained in:
Thomas Rohloff 2021-10-19 03:05:25 +02:00 • committed by Adam Honse
parent 5166316ca1
commit 92dda2f390
1 changed files with 27 additions and 7 deletions
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34
i2c_smbus/i2c_smbus_linux.cpp
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@ -47,6 +47,7 @@ bool i2c_smbus_linux_detect()
char buff[100];
unsigned short pci_device, pci_vendor, pci_subsystem_device, pci_subsystem_vendor;
unsigned short port_id;
char *ptr;
// Start looking for I2C adapters in /sys/bus/i2c/devices/
strcpy(driver_path, "/sys/bus/i2c/devices/");
@ -91,8 +92,30 @@ bool i2c_smbus_linux_detect()
pci_subsystem_device = 0;
port_id = 0;
// Get port ID for NVidia GPUs
sscanf(device_string, "NVIDIA i2c adapter %hu at", &port_id);
// Get device path
strcpy(path, driver_path);
strcat(path, ent->d_name);
if(ent->d_type == DT_LNK)
{
ptr = canonicalize_file_name(path);
if(ptr == NULL)
continue;
strcpy(path, ptr);
strcat(path, "/..");
free(ptr);
}
else
{
strcat(path, "/device");
}
ptr = path + strlen(path);
// Get PCI Vendor
snprintf(path, sizeof(path), "%s%s%s", driver_path, ent->d_name, "/device/vendor");
strcpy(ptr, "/vendor");
test_fd = open(path, O_RDONLY);
if (test_fd >= 0)
{
@ -103,11 +126,8 @@ bool i2c_smbus_linux_detect()
close(test_fd);
}
// Get port ID for NVidia GPUs
sscanf(device_string, "NVIDIA i2c adapter %hu at", &port_id);
// Get PCI Device
snprintf(path, sizeof(path), "%s%s%s", driver_path, ent->d_name, "/device/device");
strcpy(ptr, "/device");
test_fd = open(path, O_RDONLY);
if (test_fd >= 0)
{
@ -119,7 +139,7 @@ bool i2c_smbus_linux_detect()
}
// Get PCI Subsystem Vendor
snprintf(path, sizeof(path), "%s%s%s", driver_path, ent->d_name, "/device/subsystem_vendor");
strcpy(ptr, "/subsystem_vendor");
test_fd = open(path, O_RDONLY);
if (test_fd >= 0)
{
@ -131,7 +151,7 @@ bool i2c_smbus_linux_detect()
}
// Get PCI Subsystem Device
snprintf(path, sizeof(path), "%s%s%s", driver_path, ent->d_name, "/device/subsystem_device");
strcpy(ptr, "/subsystem_device");
test_fd = open(path, O_RDONLY);
if (test_fd >= 0)
{