+static int sigma_ftdi_open(const struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ int vid, pid;
+ const char *serno;
+ int ret;
+
+ devc = sdi->priv;
+ if (!devc)
+ return SR_ERR_ARG;
+
+ if (devc->ftdi.is_open)
+ return SR_OK;
+
+ vid = devc->id.vid;
+ pid = devc->id.pid;
+ serno = sdi->serial_num;
+ if (!vid || !pid || !serno || !*serno)
+ return SR_ERR_ARG;
+
+ ret = ftdi_init(&devc->ftdi.ctx);
+ if (ret < 0) {
+ sr_err("Cannot initialize FTDI context (%d): %s.",
+ ret, ftdi_get_error_string(&devc->ftdi.ctx));
+ return SR_ERR_IO;
+ }
+ ret = ftdi_usb_open_desc_index(&devc->ftdi.ctx,
+ vid, pid, NULL, serno, 0);
+ if (ret < 0) {
+ sr_err("Cannot open device (%d): %s.",
+ ret, ftdi_get_error_string(&devc->ftdi.ctx));
+ return SR_ERR_IO;
+ }
+ devc->ftdi.is_open = TRUE;
+
+ return SR_OK;
+}
+
+static int sigma_ftdi_close(struct dev_context *devc)
+{
+ int ret;
+
+ ret = ftdi_usb_close(&devc->ftdi.ctx);
+ devc->ftdi.is_open = FALSE;
+ devc->ftdi.must_close = FALSE;
+ ftdi_deinit(&devc->ftdi.ctx);
+
+ return ret == 0 ? SR_OK : SR_ERR_IO;
+}
+
+SR_PRIV int sigma_check_open(const struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ int ret;
+
+ if (!sdi)
+ return SR_ERR_ARG;
+ devc = sdi->priv;
+ if (!devc)
+ return SR_ERR_ARG;
+
+ if (devc->ftdi.is_open)
+ return SR_OK;
+
+ ret = sigma_ftdi_open(sdi);
+ if (ret != SR_OK)
+ return ret;
+ devc->ftdi.must_close = TRUE;
+
+ return ret;
+}
+
+SR_PRIV int sigma_check_close(struct dev_context *devc)
+{
+ int ret;
+
+ if (!devc)
+ return SR_ERR_ARG;
+
+ if (devc->ftdi.must_close) {
+ ret = sigma_ftdi_close(devc);
+ if (ret != SR_OK)
+ return ret;
+ devc->ftdi.must_close = FALSE;
+ }
+
+ return SR_OK;
+}
+
+SR_PRIV int sigma_force_open(const struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ int ret;
+
+ if (!sdi)
+ return SR_ERR_ARG;
+ devc = sdi->priv;
+ if (!devc)
+ return SR_ERR_ARG;
+
+ ret = sigma_ftdi_open(sdi);
+ if (ret != SR_OK)
+ return ret;
+ devc->ftdi.must_close = FALSE;
+
+ return SR_OK;
+}
+
+SR_PRIV int sigma_force_close(struct dev_context *devc)
+{
+ return sigma_ftdi_close(devc);
+}
+