Add new sr_dev_config_capabilities() helper function.

diff --git a/include/libsigrok/proto.h b/include/libsigrok/proto.h
index c2a8173f19d8f0b57708b55e85f3af1ac3f0028e..06aa29a829bee7f67a63550c637bcfc273e9850f 100644 (file)
--- a/include/libsigrok/proto.h
+++ b/include/libsigrok/proto.h
@@ -56,6 +56,8 @@ SR_API int sr_dev_channel_name_set(struct sr_channel *channel,
 SR_API int sr_dev_channel_enable(struct sr_channel *channel,
                gboolean state);
 SR_API gboolean sr_dev_has_option(const struct sr_dev_inst *sdi, int key);
+SR_API int sr_dev_config_capabilities(const struct sr_dev_inst *sdi,
+               const struct sr_channel_group *cg, int key);
 SR_API GSList *sr_dev_list(const struct sr_dev_driver *driver);
 SR_API int sr_dev_clear(const struct sr_dev_driver *driver);
 SR_API int sr_dev_open(struct sr_dev_inst *sdi);

diff --git a/src/device.c b/src/device.c
index 0eb86f4dee75ad66b05f31ba78b32ffcc39d1cba..27508a45f4b6c94a77796a0430e40a2a21fd55e1 100644 (file)
--- a/src/device.c
+++ b/src/device.c
@@ -196,6 +196,52 @@ SR_API gboolean sr_dev_has_option(const struct sr_dev_inst *sdi, int key)
        return ret;
 }
 
+/**
+ * Enumerate the configuration capabilities supported by a device instance
+ * for a given configuration key.
+ *
+ * @param sdi Pointer to the device instance to be checked. Must not be NULL.
+ *            If the device's 'driver' field is NULL (virtual device), this
+ *            function will always return FALSE (virtual devices don't have
+ *            a hardware capabilities list).
+ * @param cg  Pointer to a channel group, if a specific channel group is to
+ *            be checked. Must be NULL to check device-wide options.
+ * @param[in] key The option that should be checked for is supported by the
+ *            specified device.
+ *
+ * @retval A bitmask of enum sr_configcap values, which will be zero for
+ *         invalid inputs or if the key is unsupported.
+ *
+ * @since 0.4.0
+ */
+SR_API int sr_dev_config_capabilities(const struct sr_dev_inst *sdi,
+               const struct sr_channel_group *cg, const int key)
+{
+       GVariant *gvar;
+       const int *devopts;
+       gsize num_opts, i;
+       int ret;
+
+       if (!sdi || !sdi->driver || !sdi->driver->config_list)
+               return 0;
+
+       if (sdi->driver->config_list(SR_CONF_DEVICE_OPTIONS,
+                               &gvar, sdi, cg) != SR_OK)
+               return 0;
+
+       ret = 0;
+       devopts = g_variant_get_fixed_array(gvar, &num_opts, sizeof(int32_t));
+       for (i = 0; i < num_opts; i++) {
+               if ((devopts[i] & SR_CONF_MASK) == key) {
+                       ret = devopts[i] & ~SR_CONF_MASK;
+                       break;
+               }
+       }
+       g_variant_unref(gvar);
+
+       return ret;
+}
+
 /**
  * Allocate and init a new user-generated device instance.
  *