add usb_ftdi_set_latency

usbutils.c

@@ -2489,6 +2489,21 @@ int usb_ftdi_cts(struct cgpu_info *cgpu)
 	return (ret & FTDI_RS0_CTS);
 }
 
+int usb_ftdi_set_latency(struct cgpu_info *cgpu)
+{
+	int err;
+
+	err = usb_transfer_data(cgpu, FTDI_TYPE_OUT, FTDI_REQUEST_LATENCY,
+				cgpu->usbdev->found->latency,
+				cgpu->usbdev->found->interface, NULL, 0, C_LATENCY);
+
+	applog(LOG_DEBUG, "%s: cgid %d %s got err %d",
+				cgpu->drv->name, cgpu->cgminer_id,
+				usb_cmdname(C_LATENCY), err);
+
+	return err;
+}
+
 void usb_buffer_enable(struct cgpu_info *cgpu)
 {
 	struct cg_usb_device *cgusb = cgpu->usbdev;

usbutils.h

@@ -256,11 +256,11 @@ void usb_detect(struct device_drv *drv, bool (*device_detect)(struct libusb_devi
 struct api_data *api_usb_stats(int *count);
 void update_usb_stats(struct cgpu_info *cgpu);
 int _usb_read(struct cgpu_info *cgpu, int ep, char *buf, size_t bufsiz, int *processed, unsigned int timeout, const char *end, enum usb_cmds cmd, bool readonce);
-int usb_ftdi_cts(struct cgpu_info *cgpu);
-int usb_ftdi_ctw(struct cgpu_info *cgpu);
 int _usb_write(struct cgpu_info *cgpu, int ep, char *buf, size_t bufsiz, int *processed, unsigned int timeout, enum usb_cmds);
 int _usb_transfer(struct cgpu_info *cgpu, uint8_t request_type, uint8_t bRequest, uint16_t wValue, uint16_t wIndex, uint32_t *data, int siz, unsigned int timeout, enum usb_cmds cmd);
 int _usb_transfer_read(struct cgpu_info *cgpu, uint8_t request_type, uint8_t bRequest, uint16_t wValue, uint16_t wIndex, char *buf, int bufsiz, int *amount, unsigned int timeout, enum usb_cmds cmd);
+int usb_ftdi_cts(struct cgpu_info *cgpu);
+int usb_ftdi_set_latency(struct cgpu_info *cgpu);
 void usb_buffer_enable(struct cgpu_info *cgpu);
 void usb_buffer_disable(struct cgpu_info *cgpu);
 void usb_buffer_clear(struct cgpu_info *cgpu);