diff options
| -rw-r--r-- | Documentation/video4linux/v4l2-controls.txt | 21 | ||||
| -rw-r--r-- | drivers/media/video/v4l2-ctrls.c | 21 | ||||
| -rw-r--r-- | include/media/v4l2-ctrls.h | 17 |
3 files changed, 59 insertions, 0 deletions
diff --git a/Documentation/video4linux/v4l2-controls.txt b/Documentation/video4linux/v4l2-controls.txt index e2492a9..43da22b 100644 --- a/Documentation/video4linux/v4l2-controls.txt +++ b/Documentation/video4linux/v4l2-controls.txt @@ -130,8 +130,18 @@ Menu controls are added by calling v4l2_ctrl_new_std_menu: const struct v4l2_ctrl_ops *ops, u32 id, s32 max, s32 skip_mask, s32 def); +Or alternatively for integer menu controls, by calling v4l2_ctrl_new_int_menu: + + struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl, + const struct v4l2_ctrl_ops *ops, + u32 id, s32 max, s32 def, const s64 *qmenu_int); + These functions are typically called right after the v4l2_ctrl_handler_init: + static const s64 exp_bias_qmenu[] = { + -2, -1, 0, 1, 2 + }; + v4l2_ctrl_handler_init(&foo->ctrl_handler, nr_of_controls); v4l2_ctrl_new_std(&foo->ctrl_handler, &foo_ctrl_ops, V4L2_CID_BRIGHTNESS, 0, 255, 1, 128); @@ -141,6 +151,11 @@ These functions are typically called right after the v4l2_ctrl_handler_init: V4L2_CID_POWER_LINE_FREQUENCY, V4L2_CID_POWER_LINE_FREQUENCY_60HZ, 0, V4L2_CID_POWER_LINE_FREQUENCY_DISABLED); + v4l2_ctrl_new_int_menu(&foo->ctrl_handler, &foo_ctrl_ops, + V4L2_CID_EXPOSURE_BIAS, + ARRAY_SIZE(exp_bias_qmenu) - 1, + ARRAY_SIZE(exp_bias_qmenu) / 2 - 1, + exp_bias_qmenu); ... if (foo->ctrl_handler.error) { int err = foo->ctrl_handler.error; @@ -164,6 +179,12 @@ controls. There is no min argument since that is always 0 for menu controls, and instead of a step there is a skip_mask argument: if bit X is 1, then menu item X is skipped. +The v4l2_ctrl_new_int_menu function creates a new standard integer menu +control with driver-specific items in the menu. It differs from +v4l2_ctrl_new_std_menu in that it doesn't have the mask argument and takes +as the last argument an array of signed 64-bit integers that form an exact +menu item list. + Note that if something fails, the function will return NULL or an error and set ctrl_handler->error to the error code. If ctrl_handler->error was already set, then it will just return and do nothing. This is also true for diff --git a/drivers/media/video/v4l2-ctrls.c b/drivers/media/video/v4l2-ctrls.c index 9bd8a92..fdcb9e2 100644 --- a/drivers/media/video/v4l2-ctrls.c +++ b/drivers/media/video/v4l2-ctrls.c @@ -1544,6 +1544,27 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl, } EXPORT_SYMBOL(v4l2_ctrl_new_std_menu); +/* Helper function for standard integer menu controls */ +struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl, + const struct v4l2_ctrl_ops *ops, + u32 id, s32 max, s32 def, const s64 *qmenu_int) +{ + const char *name; + enum v4l2_ctrl_type type; + s32 min; + s32 step; + u32 flags; + + v4l2_ctrl_fill(id, &name, &type, &min, &max, &step, &def, &flags); + if (type != V4L2_CTRL_TYPE_INTEGER_MENU) { + handler_set_err(hdl, -EINVAL); + return NULL; + } + return v4l2_ctrl_new(hdl, ops, id, name, type, + 0, max, 0, def, flags, NULL, qmenu_int, NULL); +} +EXPORT_SYMBOL(v4l2_ctrl_new_int_menu); + /* Add a control from another handler to this handler */ struct v4l2_ctrl *v4l2_ctrl_add_ctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_ctrl *ctrl) diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h index 5edd64d..776605f 100644 --- a/include/media/v4l2-ctrls.h +++ b/include/media/v4l2-ctrls.h @@ -351,6 +351,23 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl, const struct v4l2_ctrl_ops *ops, u32 id, s32 max, s32 mask, s32 def); +/** v4l2_ctrl_new_int_menu() - Create a new standard V4L2 integer menu control. + * @hdl: The control handler. + * @ops: The control ops. + * @id: The control ID. + * @max: The control's maximum value. + * @def: The control's default value. + * @qmenu_int: The control's menu entries. + * + * Same as v4l2_ctrl_new_std_menu(), but @mask is set to 0 and it additionaly + * takes as an argument an array of integers determining the menu items. + * + * If @id refers to a non-integer-menu control, then this function will return NULL. + */ +struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl, + const struct v4l2_ctrl_ops *ops, + u32 id, s32 max, s32 def, const s64 *qmenu_int); + /** v4l2_ctrl_add_ctrl() - Add a control from another handler to this handler. * @hdl: The control handler. * @ctrl: The control to add. |