mirror of https://github.com/Genymobile/scrcpy
Extract USB handling from AOA
The AOA code handled both USB initialization and AOA commands/events. Extract USB-related code to a separate file and structure. PR #2974 <https://github.com/Genymobile/scrcpy/pull/2974>otg
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#include "usb.h"
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#include <assert.h>
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#include "util/log.h"
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static inline void
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log_libusb_error(enum libusb_error errcode) {
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LOGW("libusb error: %s", libusb_strerror(errcode));
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}
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static bool
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accept_device(libusb_device *device, const char *serial) {
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// Do not log any USB error in this function, it is expected that many USB
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// devices available on the computer have permission restrictions
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struct libusb_device_descriptor desc;
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int result = libusb_get_device_descriptor(device, &desc);
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if (result < 0 || !desc.iSerialNumber) {
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return false;
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}
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libusb_device_handle *handle;
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result = libusb_open(device, &handle);
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if (result < 0) {
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return false;
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}
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char buffer[128];
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result = libusb_get_string_descriptor_ascii(handle, desc.iSerialNumber,
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(unsigned char *) buffer,
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sizeof(buffer));
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libusb_close(handle);
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if (result < 0) {
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return false;
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}
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buffer[sizeof(buffer) - 1] = '\0'; // just in case
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// Accept the device if its serial matches
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return !strcmp(buffer, serial);
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}
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static libusb_device *
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sc_usb_find_device(const char *serial) {
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if (!serial) {
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return NULL;
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}
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libusb_device **list;
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libusb_device *result = NULL;
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ssize_t count = libusb_get_device_list(NULL, &list);
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if (count < 0) {
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log_libusb_error((enum libusb_error) count);
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return NULL;
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}
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for (size_t i = 0; i < (size_t) count; ++i) {
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libusb_device *device = list[i];
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if (accept_device(device, serial)) {
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result = libusb_ref_device(device);
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break;
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}
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}
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libusb_free_device_list(list, 1);
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return result;
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}
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static libusb_device_handle *
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sc_usb_open_handle(libusb_device *device) {
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libusb_device_handle *handle;
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int result = libusb_open(device, &handle);
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if (result < 0) {
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log_libusb_error((enum libusb_error) result);
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return NULL;
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}
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return handle;
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}
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bool
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sc_usb_init(struct sc_usb *usb, const char *serial) {
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// There is only one device, initialize the context here
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if (libusb_init(&usb->context) != LIBUSB_SUCCESS) {
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return false;
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}
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usb->device = sc_usb_find_device(serial);
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if (!usb->device) {
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LOGW("USB device %s not found", serial);
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libusb_exit(usb->context);
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return false;
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}
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usb->handle = sc_usb_open_handle(usb->device);
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if (!usb->handle) {
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LOGW("Could not open USB device %s", serial);
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libusb_unref_device(usb->device);
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libusb_exit(usb->context);
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return false;
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}
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return true;
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}
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void
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sc_usb_destroy(struct sc_usb *usb) {
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libusb_close(usb->handle);
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libusb_unref_device(usb->device);
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libusb_exit(usb->context);
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}
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@ -0,0 +1,21 @@
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#ifndef SC_USB_H
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#define SC_USB_H
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#include "common.h"
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#include <stdbool.h>
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#include <libusb-1.0/libusb.h>
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struct sc_usb {
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libusb_context *context;
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libusb_device *device;
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libusb_device_handle *handle;
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};
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bool
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sc_usb_init(struct sc_usb *usb, const char *serial);
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void
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sc_usb_destroy(struct sc_usb *usb);
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#endif
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