serial-dmm: more DMM parser callbacks (open, var length, config, start)

[libsigrok.git] / src / hardware / atten-pps3xxx / api.c

diff --git a/src/hardware/atten-pps3xxx/api.c b/src/hardware/atten-pps3xxx/api.c
index f08671fb1081b28083601d0113c7afad8b4a0ccd..dc6e5201977d30769956521c1450ffebfd8eb8b4 100644 (file)
--- a/src/hardware/atten-pps3xxx/api.c
+++ b/src/hardware/atten-pps3xxx/api.c
@@ -113,8 +113,6 @@ static GSList *scan(struct sr_dev_driver *di, GSList *options, int modelid)
        if (serial_open(serial, SERIAL_RDWR) != SR_OK)
                return NULL;
 
-       serial_flush(serial);
-
        /* This is how the vendor software scans for hardware. */
        memset(packet, 0, PACKET_SIZE);
        packet[0] = 0xaa;
@@ -317,6 +315,8 @@ static int config_list(uint32_t key, GVariant **data,
                case SR_CONF_DEVICE_OPTIONS:
                        return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
                case SR_CONF_CHANNEL_CONFIG:
+                       if (!devc || !devc->model)
+                               return SR_ERR_ARG;
                        if (devc->model->channel_modes == CHANMODE_INDEPENDENT) {
                                /* The 1-channel models. */
                                *data = g_variant_new_strv(channel_modes, 1);
@@ -338,9 +338,13 @@ static int config_list(uint32_t key, GVariant **data,
                        *data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg));
                        break;
                case SR_CONF_VOLTAGE_TARGET:
+                       if (!devc || !devc->model)
+                               return SR_ERR_ARG;
                        *data = std_gvar_min_max_step_array(devc->model->channels[channel].voltage);
                        break;
                case SR_CONF_CURRENT_LIMIT:
+                       if (!devc || !devc->model)
+                               return SR_ERR_ARG;
                        *data = std_gvar_min_max_step_array(devc->model->channels[channel].current);
                        break;
                default: