Add new sr_dev_config_capabilities() helper function.

[libsigrok.git] / src / device.c

diff --git a/src/device.c b/src/device.c
index 01f413486357d546817c05c7bffc27974c031d13..27508a45f4b6c94a77796a0430e40a2a21fd55e1 100644 (file)
--- a/src/device.c
+++ b/src/device.c
@@ -17,10 +17,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <config.h>
 #include <stdio.h>
 #include <glib.h>
-#include "config.h" /* Needed for HAVE_LIBUSB_1_0 and others. */
-#include "libsigrok.h"
+#include <libsigrok/libsigrok.h>
 #include "libsigrok-internal.h"
 
 /** @cond PRIVATE */
@@ -133,6 +133,25 @@ SR_API int sr_dev_channel_enable(struct sr_channel *channel,
        return SR_OK;
 }
 
+/* Returns the next enabled channel, wrapping around if necessary. */
+SR_PRIV struct sr_channel *sr_next_enabled_channel(const struct sr_dev_inst *sdi,
+               struct sr_channel *cur_channel)
+{
+       struct sr_channel *next_channel;
+       GSList *l;
+
+       next_channel = cur_channel;
+       do {
+               l = g_slist_find(sdi->channels, next_channel);
+               if (l && l->next)
+                       next_channel = l->next->data;
+               else
+                       next_channel = sdi->channels->data;
+       } while (!next_channel->enabled);
+
+       return next_channel;
+}
+
 /**
  * Determine whether the specified device instance has the specified
  * capability.
@@ -177,6 +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.
  *
@@ -242,6 +307,9 @@ SR_PRIV void sr_dev_inst_free(struct sr_dev_inst *sdi)
        }
        g_slist_free(sdi->channel_groups);
 
+       if (sdi->session)
+               sr_session_dev_remove(sdi->session, sdi);
+
        g_free(sdi->vendor);
        g_free(sdi->model);
        g_free(sdi->version);
@@ -522,11 +590,10 @@ SR_API const char *sr_dev_inst_connid_get(const struct sr_dev_inst *sdi)
 {
 #ifdef HAVE_LIBUSB_1_0
        struct drv_context *drvc;
-       int r, cnt, i, a, b;
+       int cnt, i, a, b;
        char connection_id[64];
        struct sr_usb_dev_inst *usb;
        struct libusb_device **devlist;
-       struct libusb_device_descriptor des;
 #endif
 
        if (!sdi)
@@ -557,12 +624,6 @@ SR_API const char *sr_dev_inst_connid_get(const struct sr_dev_inst *sdi)
                }
 
                for (i = 0; i < cnt; i++) {
-                       if ((r = libusb_get_device_descriptor(devlist[i], &des)) < 0) {
-                               sr_err("Failed to get device descriptor: %s.",
-                                      libusb_error_name(r));
-                               continue;
-                       }
-
                        /* Find the USB device by the logical address we know. */
                        b = libusb_get_bus_number(devlist[i]);
                        a = libusb_get_device_address(devlist[i]);