From 9768352ac1f9cc3aae675adb299452bd28a54734 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Tue, 16 Dec 2008 06:46:32 -0300 Subject: [PATCH] V4L/DVB (9903): uvcvideo: V4L2 zoom controls support Add support for absolute and continuous zoom controls (mapped to absolute and relative UVC zoom controls). Signed-off-by: Laurent Pinchart Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/uvc/uvc_ctrl.c | 76 +++++++++++++++++++++++++----- drivers/media/video/uvc/uvc_v4l2.c | 4 +- drivers/media/video/uvc/uvcvideo.h | 5 ++ 3 files changed, 71 insertions(+), 14 deletions(-) diff --git a/drivers/media/video/uvc/uvc_ctrl.c b/drivers/media/video/uvc/uvc_ctrl.c index 335cb00e595b..2208165aa6f0 100644 --- a/drivers/media/video/uvc/uvc_ctrl.c +++ b/drivers/media/video/uvc/uvc_ctrl.c @@ -327,6 +327,31 @@ static struct uvc_menu_info exposure_auto_controls[] = { { 8, "Aperture Priority Mode" }, }; +static __s32 uvc_ctrl_get_zoom(struct uvc_control_mapping *mapping, + __u8 query, const __u8 *data) +{ + __s8 zoom = (__s8)data[0]; + + switch (query) { + case GET_CUR: + return (zoom == 0) ? 0 : (zoom > 0 ? data[2] : -data[2]); + + case GET_MIN: + case GET_MAX: + case GET_RES: + case GET_DEF: + default: + return data[2]; + } +} + +static void uvc_ctrl_set_zoom(struct uvc_control_mapping *mapping, + __s32 value, __u8 *data) +{ + data[0] = value == 0 ? 0 : (value > 0) ? 1 : 0xff; + data[2] = min(abs(value), 0xff); +} + static struct uvc_control_mapping uvc_ctrl_mappings[] = { { .id = V4L2_CID_BRIGHTNESS, @@ -532,6 +557,28 @@ static struct uvc_control_mapping uvc_ctrl_mappings[] = { .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN, .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN, }, + { + .id = V4L2_CID_ZOOM_ABSOLUTE, + .name = "Zoom, Absolute", + .entity = UVC_GUID_UVC_CAMERA, + .selector = CT_ZOOM_ABSOLUTE_CONTROL, + .size = 16, + .offset = 0, + .v4l2_type = V4L2_CTRL_TYPE_INTEGER, + .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, + }, + { + .id = V4L2_CID_ZOOM_CONTINUOUS, + .name = "Zoom, Continuous", + .entity = UVC_GUID_UVC_CAMERA, + .selector = CT_ZOOM_RELATIVE_CONTROL, + .size = 0, + .offset = 0, + .v4l2_type = V4L2_CTRL_TYPE_INTEGER, + .data_type = UVC_CTRL_DATA_TYPE_SIGNED, + .get = uvc_ctrl_get_zoom, + .set = uvc_ctrl_set_zoom, + }, { .id = V4L2_CID_PRIVACY, .name = "Privacy", @@ -568,8 +615,8 @@ static inline void uvc_clear_bit(__u8 *data, int bit) * a signed 32bit integer. Sign extension will be performed if the mapping * references a signed data type. */ -static __s32 uvc_get_le_value(const __u8 *data, - struct uvc_control_mapping *mapping) +static __s32 uvc_get_le_value(struct uvc_control_mapping *mapping, + __u8 query, const __u8 *data) { int bits = mapping->size; int offset = mapping->offset; @@ -598,8 +645,8 @@ static __s32 uvc_get_le_value(const __u8 *data, /* Set the bit string specified by mapping->offset and mapping->size * in the little-endian data stored at 'data' to the value 'value'. */ -static void uvc_set_le_value(__s32 value, __u8 *data, - struct uvc_control_mapping *mapping) +static void uvc_set_le_value(struct uvc_control_mapping *mapping, + __s32 value, __u8 *data) { int bits = mapping->size; int offset = mapping->offset; @@ -751,7 +798,7 @@ int uvc_query_v4l2_ctrl(struct uvc_video_device *video, video->dev->intfnum, ctrl->info->selector, data, ctrl->info->size)) < 0) goto out; - v4l2_ctrl->default_value = uvc_get_le_value(data, mapping); + v4l2_ctrl->default_value = mapping->get(mapping, GET_DEF, data); } switch (mapping->v4l2_type) { @@ -787,21 +834,21 @@ int uvc_query_v4l2_ctrl(struct uvc_video_device *video, video->dev->intfnum, ctrl->info->selector, data, ctrl->info->size)) < 0) goto out; - v4l2_ctrl->minimum = uvc_get_le_value(data, mapping); + v4l2_ctrl->minimum = mapping->get(mapping, GET_MIN, data); } if (ctrl->info->flags & UVC_CONTROL_GET_MAX) { if ((ret = uvc_query_ctrl(video->dev, GET_MAX, ctrl->entity->id, video->dev->intfnum, ctrl->info->selector, data, ctrl->info->size)) < 0) goto out; - v4l2_ctrl->maximum = uvc_get_le_value(data, mapping); + v4l2_ctrl->maximum = mapping->get(mapping, GET_MAX, data); } if (ctrl->info->flags & UVC_CONTROL_GET_RES) { if ((ret = uvc_query_ctrl(video->dev, GET_RES, ctrl->entity->id, video->dev->intfnum, ctrl->info->selector, data, ctrl->info->size)) < 0) goto out; - v4l2_ctrl->step = uvc_get_le_value(data, mapping); + v4l2_ctrl->step = mapping->get(mapping, GET_RES, data); } ret = 0; @@ -938,8 +985,8 @@ int uvc_ctrl_get(struct uvc_video_device *video, ctrl->loaded = 1; } - xctrl->value = uvc_get_le_value( - uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), mapping); + xctrl->value = mapping->get(mapping, GET_CUR, + uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT)); if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) { menu = mapping->menu_info; @@ -995,8 +1042,8 @@ int uvc_ctrl_set(struct uvc_video_device *video, ctrl->info->size); } - uvc_set_le_value(value, - uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), mapping); + mapping->set(mapping, value, + uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT)); ctrl->dirty = 1; ctrl->modified = 1; @@ -1272,6 +1319,11 @@ int uvc_ctrl_add_mapping(struct uvc_control_mapping *mapping) struct uvc_control_mapping *map; int ret = -EINVAL; + if (mapping->get == NULL) + mapping->get = uvc_get_le_value; + if (mapping->set == NULL) + mapping->set = uvc_set_le_value; + if (mapping->id & ~V4L2_CTRL_ID_MASK) { uvc_trace(UVC_TRACE_CONTROL, "Can't add mapping '%s' with " "invalid control id 0x%08x\n", mapping->name, diff --git a/drivers/media/video/uvc/uvc_v4l2.c b/drivers/media/video/uvc/uvc_v4l2.c index 7b1c1363583c..2e1fd1b2a619 100644 --- a/drivers/media/video/uvc/uvc_v4l2.c +++ b/drivers/media/video/uvc/uvc_v4l2.c @@ -914,7 +914,7 @@ static int uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) if (!capable(CAP_SYS_ADMIN)) return -EPERM; - info = kmalloc(sizeof *info, GFP_KERNEL); + info = kzalloc(sizeof *info, GFP_KERNEL); if (info == NULL) return -ENOMEM; @@ -941,7 +941,7 @@ static int uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) if (!capable(CAP_SYS_ADMIN)) return -EPERM; - map = kmalloc(sizeof *map, GFP_KERNEL); + map = kzalloc(sizeof *map, GFP_KERNEL); if (map == NULL) return -ENOMEM; diff --git a/drivers/media/video/uvc/uvcvideo.h b/drivers/media/video/uvc/uvcvideo.h index 00d593776b86..2a5bdacbaf27 100644 --- a/drivers/media/video/uvc/uvcvideo.h +++ b/drivers/media/video/uvc/uvcvideo.h @@ -384,6 +384,11 @@ struct uvc_control_mapping { struct uvc_menu_info *menu_info; __u32 menu_count; + + __s32 (*get) (struct uvc_control_mapping *mapping, __u8 query, + const __u8 *data); + void (*set) (struct uvc_control_mapping *mapping, __s32 value, + __u8 *data); }; struct uvc_control { -- 2.20.1