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Make utility work in the face of 2 issues found on Ubuntu 16.04 #44

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Make utility work in the face of 2 issues found on Ubuntu 16.04 #44

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4208807
Fix for resource busy, and also for machines where the interface id i…
nitsanw Sep 28, 2016
948c1c8
handle old/new interface numbers
nitsanw Sep 28, 2016
e3632ef
Nicer messages
nitsanw Sep 28, 2016
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42 changes: 29 additions & 13 deletions ipad_charge.c
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Original file line number Diff line number Diff line change
Expand Up @@ -33,31 +33,46 @@ int set_charging_mode(libusb_device *dev, bool enable) {
struct libusb_device_handle *dev_handle;

if ((ret = libusb_open(dev, &dev_handle)) < 0) {
fprintf(stderr, "ipad_charge: unable to open device: error %d\n", ret);
fprintf(stderr, "ipad_charge: %s\n", libusb_strerror(ret));
fprintf(stderr, "ipad_charge: Unable to open device: error %d [%s]\n", ret, libusb_strerror(ret));
return ret;
}

if ((ret = libusb_claim_interface(dev_handle, 0)) < 0) {
fprintf(stderr, "ipad_charge: unable to claim interface: error %d\n", ret);
fprintf(stderr, "ipad_charge: %s\n", libusb_strerror(ret));
goto out_close;
fprintf(stderr, "ipad_charge: Opened device\n");
// Resource Busy issue is caused because kernel is attached to device, so enable auto detach
if ((ret = libusb_set_auto_detach_kernel_driver(dev_handle, 1)) < 0) {
fprintf(stderr, "ipad_charge: Set auto detach failed: error %d [%s]\n", ret, libusb_strerror(ret));
goto out_close;
}
fprintf(stderr, "ipad_charge: Set device to auto detach\n");

int bInterfaceNumber = 0;
// Original code assumes the bInterfaceNumber is always 0, for me it turned out to be 2.
// You can use lsusb to find out which interface numbers are available.
if ((ret = libusb_claim_interface(dev_handle, bInterfaceNumber)) < 0) {
int retFor0 = ret;
bInterfaceNumber = 2;
if ((ret = libusb_claim_interface(dev_handle, 2)) < 0) {
fprintf(stderr, "ipad_charge: Unable to claim interface 0: error %d [%s]\n", retFor0, libusb_strerror(retFor0));
fprintf(stderr, "ipad_charge: Unable to claim interface 2: error %d [%s]\n", ret, libusb_strerror(ret));
goto out_close;
}
}
fprintf(stderr, "ipad_charge: Claimed interface %d\n", bInterfaceNumber);


// the 3rd and 4th numbers are the extra current in mA that the Apple device may draw in suspend state.
// Originally, the 4th was 0x6400, or 25600mA. I believe this was a bug and they meant 0x640, or 1600 mA which would be the max
// for the MFi spec. Also the typical values for the 3nd listed in the MFi spec are 0, 100, 500 so I chose 500 for that.
// And changed it to decimal to be clearer.
if ((ret = libusb_control_transfer(dev_handle, CTRL_OUT, 0x40, 500, enable ? 1600 : 0, NULL, 0, 2000)) < 0) {
fprintf(stderr, "ipad_charge: unable to send command: error %d\n", ret);
fprintf(stderr, "ipad_charge: %s\n", libusb_strerror(ret));
fprintf(stderr, "ipad_charge: Unable to send command: error %d [%s]\n", ret, libusb_strerror(ret));
goto out_release;
}

ret = 0;

out_release:
libusb_release_interface(dev_handle, 0);
libusb_release_interface(dev_handle, bInterfaceNumber);
out_close:
libusb_close(dev_handle);

Expand Down Expand Up @@ -168,7 +183,7 @@ int main(int argc, char *argv[]) {
|| desc.idProduct == PRODUCT_IPHONE_4S
|| desc.idProduct == PRODUCT_IPHONE_5
|| desc.idProduct == PRODUCT_IPAD4)) {

fprintf(stdout, "ipad_charge: Found iPad (bus number= %d, port = %d, address = %d)\n", libusb_get_bus_number(dev), libusb_get_port_number(dev), libusb_get_device_address(dev));
if (set_charging_mode(dev, enable) < 0)
fprintf(stderr, "ipad_charge: error setting charge mode\n");
else
Expand All @@ -180,9 +195,10 @@ int main(int argc, char *argv[]) {
if (count < 1) {
fprintf(stderr, "ipad_charge: no such device or an error occured\n");
ret = 3;
} else
ret = 0;

} else {
fprintf(stderr, "ipad_charge: Charging %d devices\n", count);
ret = 0;
}
libusb_free_device_list(devs, 1);
out_exit:
libusb_exit(NULL);
Expand Down