/* * Copyright (c) 2016 Intel Corporation * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that * the above copyright notice appear in all copies and that both that copyright * notice and this permission notice appear in supporting documentation, and * that the name of the copyright holders not be used in advertising or * publicity pertaining to distribution of the software without specific, * written prior permission. The copyright holders make no representations * about the suitability of this software for any purpose. It is provided "as * is" without express or implied warranty. * * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE * OF THIS SOFTWARE. */ #ifndef __DRM_CONNECTOR_H__ #define __DRM_CONNECTOR_H__ #include #include #include #include struct drm_device; struct drm_connector_helper_funcs; struct drm_device; struct drm_crtc; struct drm_encoder; struct drm_property; struct drm_property_blob; struct drm_printer; struct edid; enum drm_connector_force { DRM_FORCE_UNSPECIFIED, DRM_FORCE_OFF, DRM_FORCE_ON, /* force on analog part normally */ DRM_FORCE_ON_DIGITAL, /* for DVI-I use digital connector */ }; /** * enum drm_connector_status - status for a &drm_connector * * This enum is used to track the connector status. There are no separate * #defines for the uapi! */ enum drm_connector_status { /** * @connector_status_connected: The connector is definitely connected to * a sink device, and can be enabled. */ connector_status_connected = 1, /** * @connector_status_disconnected: The connector isn't connected to a * sink device which can be autodetect. For digital outputs like DP or * HDMI (which can be realiable probed) this means there's really * nothing there. It is driver-dependent whether a connector with this * status can be lit up or not. */ connector_status_disconnected = 2, /** * @connector_status_unknown: The connector's status could not be * reliably detected. This happens when probing would either cause * flicker (like load-detection when the connector is in use), or when a * hardware resource isn't available (like when load-detection needs a * free CRTC). It should be possible to light up the connector with one * of the listed fallback modes. For default configuration userspace * should only try to light up connectors with unknown status when * there's not connector with @connector_status_connected. */ connector_status_unknown = 3, }; enum subpixel_order { SubPixelUnknown = 0, SubPixelHorizontalRGB, SubPixelHorizontalBGR, SubPixelVerticalRGB, SubPixelVerticalBGR, SubPixelNone, }; /** * struct drm_display_info - runtime data about the connected sink * * Describes a given display (e.g. CRT or flat panel) and its limitations. For * fixed display sinks like built-in panels there's not much difference between * this and struct &drm_connector. But for sinks with a real cable this * structure is meant to describe all the things at the other end of the cable. * * For sinks which provide an EDID this can be filled out by calling * drm_add_edid_modes(). */ struct drm_display_info { /** * @name: Name of the display. */ char name[DRM_DISPLAY_INFO_LEN]; /** * @width_mm: Physical width in mm. */ unsigned int width_mm; /** * @height_mm: Physical height in mm. */ unsigned int height_mm; /** * @pixel_clock: Maximum pixel clock supported by the sink, in units of * 100Hz. This mismatches the clok in &drm_display_mode (which is in * kHZ), because that's what the EDID uses as base unit. */ unsigned int pixel_clock; /** * @bpc: Maximum bits per color channel. Used by HDMI and DP outputs. */ unsigned int bpc; /** * @subpixel_order: Subpixel order of LCD panels. */ enum subpixel_order subpixel_order; #define DRM_COLOR_FORMAT_RGB444 (1<<0) #define DRM_COLOR_FORMAT_YCRCB444 (1<<1) #define DRM_COLOR_FORMAT_YCRCB422 (1<<2) /** * @color_formats: HDMI Color formats, selects between RGB and YCrCb * modes. Used DRM_COLOR_FORMAT\_ defines, which are _not_ the same ones * as used to describe the pixel format in framebuffers, and also don't * match the formats in @bus_formats which are shared with v4l. */ u32 color_formats; /** * @bus_formats: Pixel data format on the wire, somewhat redundant with * @color_formats. Array of size @num_bus_formats encoded using * MEDIA_BUS_FMT\_ defines shared with v4l and media drivers. */ const u32 *bus_formats; /** * @num_bus_formats: Size of @bus_formats array. */ unsigned int num_bus_formats; #define DRM_BUS_FLAG_DE_LOW (1<<0) #define DRM_BUS_FLAG_DE_HIGH (1<<1) /* drive data on pos. edge */ #define DRM_BUS_FLAG_PIXDATA_POSEDGE (1<<2) /* drive data on neg. edge */ #define DRM_BUS_FLAG_PIXDATA_NEGEDGE (1<<3) /** * @bus_flags: Additional information (like pixel signal polarity) for * the pixel data on the bus, using DRM_BUS_FLAGS\_ defines. */ u32 bus_flags; /** * @max_tmds_clock: Maximum TMDS clock rate supported by the * sink in kHz. 0 means undefined. */ int max_tmds_clock; /** * @dvi_dual: Dual-link DVI sink? */ bool dvi_dual; /** * @edid_hdmi_dc_modes: Mask of supported hdmi deep color modes. Even * more stuff redundant with @bus_formats. */ u8 edid_hdmi_dc_modes; /** * @cea_rev: CEA revision of the HDMI sink. */ u8 cea_rev; }; int drm_display_info_set_bus_formats(struct drm_display_info *info, const u32 *formats, unsigned int num_formats); /** * struct drm_tv_connector_state - TV connector related states * @subconnector: selected subconnector * @margins: left/right/top/bottom margins * @mode: TV mode * @brightness: brightness in percent * @contrast: contrast in percent * @flicker_reduction: flicker reduction in percent * @overscan: overscan in percent * @saturation: saturation in percent * @hue: hue in percent */ struct drm_tv_connector_state { enum drm_mode_subconnector subconnector; struct { unsigned int left; unsigned int right; unsigned int top; unsigned int bottom; } margins; unsigned int mode; unsigned int brightness; unsigned int contrast; unsigned int flicker_reduction; unsigned int overscan; unsigned int saturation; unsigned int hue; }; /** * struct drm_connector_state - mutable connector state * @connector: backpointer to the connector * @best_encoder: can be used by helpers and drivers to select the encoder * @state: backpointer to global drm_atomic_state * @tv: TV connector state */ struct drm_connector_state { struct drm_connector *connector; /** * @crtc: CRTC to connect connector to, NULL if disabled. * * Do not change this directly, use drm_atomic_set_crtc_for_connector() * instead. */ struct drm_crtc *crtc; struct drm_encoder *best_encoder; struct drm_atomic_state *state; struct drm_tv_connector_state tv; }; /** * struct drm_connector_funcs - control connectors on a given device * * Each CRTC may have one or more connectors attached to it. The functions * below allow the core DRM code to control connectors, enumerate available modes, * etc. */ struct drm_connector_funcs { /** * @dpms: * * Legacy entry point to set the per-connector DPMS state. Legacy DPMS * is exposed as a standard property on the connector, but diverted to * this callback in the drm core. Note that atomic drivers don't * implement the 4 level DPMS support on the connector any more, but * instead only have an on/off "ACTIVE" property on the CRTC object. * * Drivers implementing atomic modeset should use * drm_atomic_helper_connector_dpms() to implement this hook. * * RETURNS: * * 0 on success or a negative error code on failure. */ int (*dpms)(struct drm_connector *connector, int mode); /** * @reset: * * Reset connector hardware and software state to off. This function isn't * called by the core directly, only through drm_mode_config_reset(). * It's not a helper hook only for historical reasons. * * Atomic drivers can use drm_atomic_helper_connector_reset() to reset * atomic state using this hook. */ void (*reset)(struct drm_connector *connector); /** * @detect: * * Check to see if anything is attached to the connector. The parameter * force is set to false whilst polling, true when checking the * connector due to a user request. force can be used by the driver to * avoid expensive, destructive operations during automated probing. * * This callback is optional, if not implemented the connector will be * considered as always being attached. * * FIXME: * * Note that this hook is only called by the probe helper. It's not in * the helper library vtable purely for historical reasons. The only DRM * core entry point to probe connector state is @fill_modes. * * RETURNS: * * drm_connector_status indicating the connector's status. */ enum drm_connector_status (*detect)(struct drm_connector *connector, bool force); /** * @force: * * This function is called to update internal encoder state when the * connector is forced to a certain state by userspace, either through * the sysfs interfaces or on the kernel cmdline. In that case the * @detect callback isn't called. * * FIXME: * * Note that this hook is only called by the probe helper. It's not in * the helper library vtable purely for historical reasons. The only DRM * core entry point to probe connector state is @fill_modes. */ void (*force)(struct drm_connector *connector); /** * @fill_modes: * * Entry point for output detection and basic mode validation. The * driver should reprobe the output if needed (e.g. when hotplug * handling is unreliable), add all detected modes to connector->modes * and filter out any the device can't support in any configuration. It * also needs to filter out any modes wider or higher than the * parameters max_width and max_height indicate. * * The drivers must also prune any modes no longer valid from * connector->modes. Furthermore it must update connector->status and * connector->edid. If no EDID has been received for this output * connector->edid must be NULL. * * Drivers using the probe helpers should use * drm_helper_probe_single_connector_modes() or * drm_helper_probe_single_connector_modes_nomerge() to implement this * function. * * RETURNS: * * The number of modes detected and filled into connector->modes. */ int (*fill_modes)(struct drm_connector *connector, uint32_t max_width, uint32_t max_height); /** * @set_property: * * This is the legacy entry point to update a property attached to the * connector. * * Drivers implementing atomic modeset should use * drm_atomic_helper_connector_set_property() to implement this hook. * * This callback is optional if the driver does not support any legacy * driver-private properties. * * RETURNS: * * 0 on success or a negative error code on failure. */ int (*set_property)(struct drm_connector *connector, struct drm_property *property, uint64_t val); /** * @late_register: * * This optional hook can be used to register additional userspace * interfaces attached to the connector, light backlight control, i2c, * DP aux or similar interfaces. It is called late in the driver load * sequence from drm_connector_register() when registering all the * core drm connector interfaces. Everything added from this callback * should be unregistered in the early_unregister callback. * * This is called while holding drm_connector->mutex. * * Returns: * * 0 on success, or a negative error code on failure. */ int (*late_register)(struct drm_connector *connector); /** * @early_unregister: * * This optional hook should be used to unregister the additional * userspace interfaces attached to the connector from * late_register(). It is called from drm_connector_unregister(), * early in the driver unload sequence to disable userspace access * before data structures are torndown. * * This is called while holding drm_connector->mutex. */ void (*early_unregister)(struct drm_connector *connector); /** * @destroy: * * Clean up connector resources. This is called at driver unload time * through drm_mode_config_cleanup(). It can also be called at runtime * when a connector is being hot-unplugged for drivers that support * connector hotplugging (e.g. DisplayPort MST). */ void (*destroy)(struct drm_connector *connector); /** * @atomic_duplicate_state: * * Duplicate the current atomic state for this connector and return it. * The core and helpers guarantee that any atomic state duplicated with * this hook and still owned by the caller (i.e. not transferred to the * driver by calling ->atomic_commit() from struct * &drm_mode_config_funcs) will be cleaned up by calling the * @atomic_destroy_state hook in this structure. * * Atomic drivers which don't subclass struct &drm_connector_state should use * drm_atomic_helper_connector_duplicate_state(). Drivers that subclass the * state structure to extend it with driver-private state should use * __drm_atomic_helper_connector_duplicate_state() to make sure shared state is * duplicated in a consistent fashion across drivers. * * It is an error to call this hook before connector->state has been * initialized correctly. * * NOTE: * * If the duplicate state references refcounted resources this hook must * acquire a reference for each of them. The driver must release these * references again in @atomic_destroy_state. * * RETURNS: * * Duplicated atomic state or NULL when the allocation failed. */ struct drm_connector_state *(*atomic_duplicate_state)(struct drm_connector *connector); /** * @atomic_destroy_state: * * Destroy a state duplicated with @atomic_duplicate_state and release * or unreference all resources it references */ void (*atomic_destroy_state)(struct drm_connector *connector, struct drm_connector_state *state); /** * @atomic_set_property: * * Decode a driver-private property value and store the decoded value * into the passed-in state structure. Since the atomic core decodes all * standardized properties (even for extensions beyond the core set of * properties which might not be implemented by all drivers) this * requires drivers to subclass the state structure. * * Such driver-private properties should really only be implemented for * truly hardware/vendor specific state. Instead it is preferred to * standardize atomic extension and decode the properties used to expose * such an extension in the core. * * Do not call this function directly, use * drm_atomic_connector_set_property() instead. * * This callback is optional if the driver does not support any * driver-private atomic properties. * * NOTE: * * This function is called in the state assembly phase of atomic * modesets, which can be aborted for any reason (including on * userspace's request to just check whether a configuration would be * possible). Drivers MUST NOT touch any persistent state (hardware or * software) or data structures except the passed in @state parameter. * * Also since userspace controls in which order properties are set this * function must not do any input validation (since the state update is * incomplete and hence likely inconsistent). Instead any such input * validation must be done in the various atomic_check callbacks. * * RETURNS: * * 0 if the property has been found, -EINVAL if the property isn't * implemented by the driver (which shouldn't ever happen, the core only * asks for properties attached to this connector). No other validation * is allowed by the driver. The core already checks that the property * value is within the range (integer, valid enum value, ...) the driver * set when registering the property. */ int (*atomic_set_property)(struct drm_connector *connector, struct drm_connector_state *state, struct drm_property *property, uint64_t val); /** * @atomic_get_property: * * Reads out the decoded driver-private property. This is used to * implement the GETCONNECTOR IOCTL. * * Do not call this function directly, use * drm_atomic_connector_get_property() instead. * * This callback is optional if the driver does not support any * driver-private atomic properties. * * RETURNS: * * 0 on success, -EINVAL if the property isn't implemented by the * driver (which shouldn't ever happen, the core only asks for * properties attached to this connector). */ int (*atomic_get_property)(struct drm_connector *connector, const struct drm_connector_state *state, struct drm_property *property, uint64_t *val); /** * @atomic_print_state: * * If driver subclasses struct &drm_connector_state, it should implement * this optional hook for printing additional driver specific state. * * Do not call this directly, use drm_atomic_connector_print_state() * instead. */ void (*atomic_print_state)(struct drm_printer *p, const struct drm_connector_state *state); }; /* mode specified on the command line */ struct drm_cmdline_mode { bool specified; bool refresh_specified; bool bpp_specified; int xres, yres; int bpp; int refresh; bool rb; bool interlace; bool cvt; bool margins; enum drm_connector_force force; }; /** * struct drm_connector - central DRM connector control structure * @dev: parent DRM device * @kdev: kernel device for sysfs attributes * @attr: sysfs attributes * @head: list management * @base: base KMS object * @name: human readable name, can be overwritten by the driver * @connector_type: one of the DRM_MODE_CONNECTOR_ types from drm_mode.h * @connector_type_id: index into connector type enum * @interlace_allowed: can this connector handle interlaced modes? * @doublescan_allowed: can this connector handle doublescan? * @stereo_allowed: can this connector handle stereo modes? * @modes: modes available on this connector (from fill_modes() + user) * @status: one of the drm_connector_status enums (connected, not, or unknown) * @probed_modes: list of modes derived directly from the display * @funcs: connector control functions * @edid_blob_ptr: DRM property containing EDID if present * @properties: property tracking for this connector * @dpms: current dpms state * @helper_private: mid-layer private data * @cmdline_mode: mode line parsed from the kernel cmdline for this connector * @force: a DRM_FORCE_ state for forced mode sets * @override_edid: has the EDID been overwritten through debugfs for testing? * @encoder_ids: valid encoders for this connector * @encoder: encoder driving this connector, if any * @eld: EDID-like data, if present * @latency_present: AV delay info from ELD, if found * @video_latency: video latency info from ELD, if found * @audio_latency: audio latency info from ELD, if found * @null_edid_counter: track sinks that give us all zeros for the EDID * @bad_edid_counter: track sinks that give us an EDID with invalid checksum * @edid_corrupt: indicates whether the last read EDID was corrupt * @debugfs_entry: debugfs directory for this connector * @state: current atomic state for this connector * @has_tile: is this connector connected to a tiled monitor * @tile_group: tile group for the connected monitor * @tile_is_single_monitor: whether the tile is one monitor housing * @num_h_tile: number of horizontal tiles in the tile group * @num_v_tile: number of vertical tiles in the tile group * @tile_h_loc: horizontal location of this tile * @tile_v_loc: vertical location of this tile * @tile_h_size: horizontal size of this tile. * @tile_v_size: vertical size of this tile. * * Each connector may be connected to one or more CRTCs, or may be clonable by * another connector if they can share a CRTC. Each connector also has a specific * position in the broader display (referred to as a 'screen' though it could * span multiple monitors). */ struct drm_connector { struct drm_device *dev; struct device *kdev; struct device_attribute *attr; struct list_head head; struct drm_mode_object base; char *name; /** * @mutex: Lock for general connector state, but currently only protects * @registered. Most of the connector state is still protected by the * mutex in &drm_mode_config. */ struct mutex mutex; /** * @index: Compacted connector index, which matches the position inside * the mode_config.list for drivers not supporting hot-add/removing. Can * be used as an array index. It is invariant over the lifetime of the * connector. */ unsigned index; int connector_type; int connector_type_id; bool interlace_allowed; bool doublescan_allowed; bool stereo_allowed; /** * @registered: Is this connector exposed (registered) with userspace? * Protected by @mutex. */ bool registered; struct list_head modes; /* list of modes on this connector */ enum drm_connector_status status; /* these are modes added by probing with DDC or the BIOS */ struct list_head probed_modes; /** * @display_info: Display information is filled from EDID information * when a display is detected. For non hot-pluggable displays such as * flat panels in embedded systems, the driver should initialize the * display_info.width_mm and display_info.height_mm fields with the * physical size of the display. */ struct drm_display_info display_info; const struct drm_connector_funcs *funcs; struct drm_property_blob *edid_blob_ptr; struct drm_object_properties properties; /** * @path_blob_ptr: * * DRM blob property data for the DP MST path property. */ struct drm_property_blob *path_blob_ptr; /** * @tile_blob_ptr: * * DRM blob property data for the tile property (used mostly by DP MST). * This is meant for screens which are driven through separate display * pipelines represented by &drm_crtc, which might not be running with * genlocked clocks. For tiled panels which are genlocked, like * dual-link LVDS or dual-link DSI, the driver should try to not expose * the tiling and virtualize both &drm_crtc and &drm_plane if needed. */ struct drm_property_blob *tile_blob_ptr; /* should we poll this connector for connects and disconnects */ /* hot plug detectable */ #define DRM_CONNECTOR_POLL_HPD (1 << 0) /* poll for connections */ #define DRM_CONNECTOR_POLL_CONNECT (1 << 1) /* can cleanly poll for disconnections without flickering the screen */ /* DACs should rarely do this without a lot of testing */ #define DRM_CONNECTOR_POLL_DISCONNECT (1 << 2) /** * @polled: * * Connector polling mode, a combination of * * DRM_CONNECTOR_POLL_HPD * The connector generates hotplug events and doesn't need to be * periodically polled. The CONNECT and DISCONNECT flags must not * be set together with the HPD flag. * * DRM_CONNECTOR_POLL_CONNECT * Periodically poll the connector for connection. * * DRM_CONNECTOR_POLL_DISCONNECT * Periodically poll the connector for disconnection. * * Set to 0 for connectors that don't support connection status * discovery. */ uint8_t polled; /* requested DPMS state */ int dpms; const struct drm_connector_helper_funcs *helper_private; /* forced on connector */ struct drm_cmdline_mode cmdline_mode; enum drm_connector_force force; bool override_edid; #define DRM_CONNECTOR_MAX_ENCODER 3 uint32_t encoder_ids[DRM_CONNECTOR_MAX_ENCODER]; struct drm_encoder *encoder; /* currently active encoder */ #define MAX_ELD_BYTES 128 /* EDID bits */ uint8_t eld[MAX_ELD_BYTES]; bool latency_present[2]; int video_latency[2]; /* [0]: progressive, [1]: interlaced */ int audio_latency[2]; int null_edid_counter; /* needed to workaround some HW bugs where we get all 0s */ unsigned bad_edid_counter; /* Flag for raw EDID header corruption - used in Displayport * compliance testing - * Displayport Link CTS Core 1.2 rev1.1 4.2.2.6 */ bool edid_corrupt; struct dentry *debugfs_entry; struct drm_connector_state *state; /* DisplayID bits */ bool has_tile; struct drm_tile_group *tile_group; bool tile_is_single_monitor; uint8_t num_h_tile, num_v_tile; uint8_t tile_h_loc, tile_v_loc; uint16_t tile_h_size, tile_v_size; }; #define obj_to_connector(x) container_of(x, struct drm_connector, base) int drm_connector_init(struct drm_device *dev, struct drm_connector *connector, const struct drm_connector_funcs *funcs, int connector_type); int drm_connector_register(struct drm_connector *connector); void drm_connector_unregister(struct drm_connector *connector); int drm_mode_connector_attach_encoder(struct drm_connector *connector, struct drm_encoder *encoder); void drm_connector_cleanup(struct drm_connector *connector); static inline unsigned drm_connector_index(struct drm_connector *connector) { return connector->index; } /** * drm_connector_lookup - lookup connector object * @dev: DRM device * @id: connector object id * * This function looks up the connector object specified by id * add takes a reference to it. */ static inline struct drm_connector *drm_connector_lookup(struct drm_device *dev, uint32_t id) { struct drm_mode_object *mo; mo = drm_mode_object_find(dev, id, DRM_MODE_OBJECT_CONNECTOR); return mo ? obj_to_connector(mo) : NULL; } /** * drm_connector_reference - incr the connector refcnt * @connector: connector * * This function increments the connector's refcount. */ static inline void drm_connector_reference(struct drm_connector *connector) { drm_mode_object_reference(&connector->base); } /** * drm_connector_unreference - unref a connector * @connector: connector to unref * * This function decrements the connector's refcount and frees it if it drops to zero. */ static inline void drm_connector_unreference(struct drm_connector *connector) { drm_mode_object_unreference(&connector->base); } const char *drm_get_connector_status_name(enum drm_connector_status status); const char *drm_get_subpixel_order_name(enum subpixel_order order); const char *drm_get_dpms_name(int val); const char *drm_get_dvi_i_subconnector_name(int val); const char *drm_get_dvi_i_select_name(int val); const char *drm_get_tv_subconnector_name(int val); const char *drm_get_tv_select_name(int val); int drm_mode_create_dvi_i_properties(struct drm_device *dev); int drm_mode_create_tv_properties(struct drm_device *dev, unsigned int num_modes, const char * const modes[]); int drm_mode_create_scaling_mode_property(struct drm_device *dev); int drm_mode_create_aspect_ratio_property(struct drm_device *dev); int drm_mode_create_suggested_offset_properties(struct drm_device *dev); int drm_mode_connector_set_path_property(struct drm_connector *connector, const char *path); int drm_mode_connector_set_tile_property(struct drm_connector *connector); int drm_mode_connector_update_edid_property(struct drm_connector *connector, const struct edid *edid); /** * struct drm_tile_group - Tile group metadata * @refcount: reference count * @dev: DRM device * @id: tile group id exposed to userspace * @group_data: Sink-private data identifying this group * * @group_data corresponds to displayid vend/prod/serial for external screens * with an EDID. */ struct drm_tile_group { struct kref refcount; struct drm_device *dev; int id; u8 group_data[8]; }; struct drm_tile_group *drm_mode_create_tile_group(struct drm_device *dev, char topology[8]); struct drm_tile_group *drm_mode_get_tile_group(struct drm_device *dev, char topology[8]); void drm_mode_put_tile_group(struct drm_device *dev, struct drm_tile_group *tg); /** * drm_for_each_connector - iterate over all connectors * @connector: the loop cursor * @dev: the DRM device * * Iterate over all connectors of @dev. */ #define drm_for_each_connector(connector, dev) \ for (assert_drm_connector_list_read_locked(&(dev)->mode_config), \ connector = list_first_entry(&(dev)->mode_config.connector_list, \ struct drm_connector, head); \ &connector->head != (&(dev)->mode_config.connector_list); \ connector = list_next_entry(connector, head)) #endif