fx2lafw: Use wide_sampling only if necessary.

[libsigrok.git] / src / hardware / fx2lafw / api.c

diff --git a/src/hardware/fx2lafw/api.c b/src/hardware/fx2lafw/api.c
index dd82729ec9a2b398c272a3160a586c16f3bc6c33..4e4c3cfabce53befad346ec69a8e22773056b9c7 100644 (file)
--- a/src/hardware/fx2lafw/api.c
+++ b/src/hardware/fx2lafw/api.c
@@ -214,6 +214,20 @@ static const uint64_t dslogic_samplerates[] = {
        SR_MHZ(400),
 };
 
+static gboolean is_plausible(const struct libusb_device_descriptor *des)
+{
+       int i;
+
+       for (i = 0; supported_fx2[i].vid; i++) {
+               if (des->idVendor != supported_fx2[i].vid)
+                       continue;
+               if (des->idProduct == supported_fx2[i].pid)
+                       return TRUE;
+       }
+
+       return FALSE;
+}
+
 static GSList *scan(struct sr_dev_driver *di, GSList *options)
 {
        struct drv_context *drvc;
@@ -271,8 +285,15 @@ static GSList *scan(struct sr_dev_driver *di, GSList *options)
 
                libusb_get_device_descriptor( devlist[i], &des);
 
-               if ((ret = libusb_open(devlist[i], &hdl)) < 0)
+               if (!is_plausible(&des))
+                       continue;
+
+               if ((ret = libusb_open(devlist[i], &hdl)) < 0) {
+                       sr_warn("Failed to open potential device with "
+                               "VID:PID %04x:%04x: %s.", des.idVendor,
+                               des.idProduct, libusb_error_name(ret));
                        continue;
+               }
 
                if (des.iManufacturer == 0) {
                        manufacturer[0] = '\0';
@@ -314,7 +335,7 @@ static GSList *scan(struct sr_dev_driver *di, GSList *options)
                                        des.idProduct == supported_fx2[j].pid &&
                                        (!supported_fx2[j].usb_manufacturer ||
                                         !strcmp(manufacturer, supported_fx2[j].usb_manufacturer)) &&
-                                       (!supported_fx2[j].usb_manufacturer ||
+                                       (!supported_fx2[j].usb_product ||
                                         !strcmp(product, supported_fx2[j].usb_product))) {
                                prof = &supported_fx2[j];
                                break;
@@ -362,8 +383,6 @@ static GSList *scan(struct sr_dev_driver *di, GSList *options)
 
                devc = fx2lafw_dev_new();
                devc->profile = prof;
-               if ((prof->dev_caps & DEV_CAPS_16BIT) || (prof->dev_caps & DEV_CAPS_AX_ANALOG))
-                       devc->sample_wide = TRUE;
                sdi->priv = devc;
                devices = g_slist_append(devices, sdi);
 
@@ -960,6 +979,7 @@ static int configure_channels(const struct sr_dev_inst *sdi)
        const GSList *l;
        int p;
        struct sr_channel *ch;
+       uint32_t channel_mask = 0, num_analog = 0;
 
        devc = sdi->priv;
 
@@ -970,12 +990,18 @@ static int configure_channels(const struct sr_dev_inst *sdi)
        for (l = sdi->channels, p = 0; l; l = l->next, p++) {
                ch = l->data;
                if ((p <= NUM_CHANNELS) && (ch->type == SR_CHANNEL_ANALOG)) {
+                       num_analog++;
                        devc->ch_enabled[p] = ch->enabled;
                        devc->enabled_analog_channels =
                            g_slist_append(devc->enabled_analog_channels, ch);
+               } else {
+                       channel_mask |= ch->enabled << p;
                }
        }
 
+       /* Use no wide sampling if we have only the first 8 channels set. */
+       devc->sample_wide = (channel_mask > 0xff || num_analog > 0);
+
        return SR_OK;
 }