/* * uvc_ctrl.c -- USB Video Class driver - Controls * * Copyright (C) 2005-2008 * Laurent Pinchart (laurent.pinchart@skynet.be) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * */ #include #include #include #include #include #include #include #include #include #include #include "uvcvideo.h" #define UVC_CTRL_NDATA 2 #define UVC_CTRL_DATA_CURRENT 0 #define UVC_CTRL_DATA_BACKUP 1 /* ------------------------------------------------------------------------ * Control, formats, ... */ static struct uvc_control_info uvc_ctrls[] = { { .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_BRIGHTNESS_CONTROL, .index = 0, .size = 2, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE | UVC_CONTROL_RESTORE, }, { .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_CONTRAST_CONTROL, .index = 1, .size = 2, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE | UVC_CONTROL_RESTORE, }, { .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_HUE_CONTROL, .index = 2, .size = 2, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE, }, { .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_SATURATION_CONTROL, .index = 3, .size = 2, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE | UVC_CONTROL_RESTORE, }, { .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_SHARPNESS_CONTROL, .index = 4, .size = 2, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE | UVC_CONTROL_RESTORE, }, { .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_GAMMA_CONTROL, .index = 5, .size = 2, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE | UVC_CONTROL_RESTORE, }, { .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_BACKLIGHT_COMPENSATION_CONTROL, .index = 8, .size = 2, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE | UVC_CONTROL_RESTORE, }, { .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_GAIN_CONTROL, .index = 9, .size = 2, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE | UVC_CONTROL_RESTORE, }, { .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_POWER_LINE_FREQUENCY_CONTROL, .index = 10, .size = 1, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE | UVC_CONTROL_RESTORE, }, { .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_HUE_AUTO_CONTROL, .index = 11, .size = 1, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE, }, { .entity = UVC_GUID_UVC_CAMERA, .selector = CT_AE_MODE_CONTROL, .index = 1, .size = 1, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR | UVC_CONTROL_GET_DEF | UVC_CONTROL_GET_RES | UVC_CONTROL_RESTORE, }, { .entity = UVC_GUID_UVC_CAMERA, .selector = CT_AE_PRIORITY_CONTROL, .index = 2, .size = 1, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR | UVC_CONTROL_RESTORE, }, { .entity = UVC_GUID_UVC_CAMERA, .selector = CT_EXPOSURE_TIME_ABSOLUTE_CONTROL, .index = 3, .size = 4, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE | UVC_CONTROL_RESTORE, }, { .entity = UVC_GUID_UVC_CAMERA, .selector = CT_FOCUS_ABSOLUTE_CONTROL, .index = 5, .size = 2, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE, }, { .entity = UVC_GUID_UVC_CAMERA, .selector = CT_FOCUS_AUTO_CONTROL, .index = 17, .size = 1, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE, }, { .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL, .index = 12, .size = 1, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE, }, { .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_WHITE_BALANCE_TEMPERATURE_CONTROL, .index = 6, .size = 2, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE, }, { .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL, .index = 13, .size = 1, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_CUR | UVC_CONTROL_GET_DEF | UVC_CONTROL_RESTORE, }, { .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_WHITE_BALANCE_COMPONENT_CONTROL, .index = 7, .size = 4, .flags = UVC_CONTROL_SET_CUR | UVC_CONTROL_GET_RANGE | UVC_CONTROL_RESTORE | UVC_CONTROL_AUTO_UPDATE, }, }; static struct uvc_menu_info power_line_frequency_controls[] = { { 0, "Disabled" }, { 1, "50 Hz" }, { 2, "60 Hz" }, }; static struct uvc_menu_info exposure_auto_controls[] = { { 2, "Auto Mode" }, { 1, "Manual Mode" }, { 4, "Shutter Priority Mode" }, { 8, "Aperture Priority Mode" }, }; static struct uvc_control_mapping uvc_ctrl_mappings[] = { { .id = V4L2_CID_BRIGHTNESS, .name = "Brightness", .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_BRIGHTNESS_CONTROL, .size = 16, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_INTEGER, .data_type = UVC_CTRL_DATA_TYPE_SIGNED, }, { .id = V4L2_CID_CONTRAST, .name = "Contrast", .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_CONTRAST_CONTROL, .size = 16, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_INTEGER, .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, }, { .id = V4L2_CID_HUE, .name = "Hue", .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_HUE_CONTROL, .size = 16, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_INTEGER, .data_type = UVC_CTRL_DATA_TYPE_SIGNED, }, { .id = V4L2_CID_SATURATION, .name = "Saturation", .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_SATURATION_CONTROL, .size = 16, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_INTEGER, .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, }, { .id = V4L2_CID_SHARPNESS, .name = "Sharpness", .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_SHARPNESS_CONTROL, .size = 16, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_INTEGER, .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, }, { .id = V4L2_CID_GAMMA, .name = "Gamma", .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_GAMMA_CONTROL, .size = 16, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_INTEGER, .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, }, { .id = V4L2_CID_BACKLIGHT_COMPENSATION, .name = "Backlight Compensation", .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_BACKLIGHT_COMPENSATION_CONTROL, .size = 16, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_INTEGER, .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, }, { .id = V4L2_CID_GAIN, .name = "Gain", .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_GAIN_CONTROL, .size = 16, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_INTEGER, .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, }, { .id = V4L2_CID_POWER_LINE_FREQUENCY, .name = "Power Line Frequency", .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_POWER_LINE_FREQUENCY_CONTROL, .size = 2, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_MENU, .data_type = UVC_CTRL_DATA_TYPE_ENUM, .menu_info = power_line_frequency_controls, .menu_count = ARRAY_SIZE(power_line_frequency_controls), }, { .id = V4L2_CID_HUE_AUTO, .name = "Hue, Auto", .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_HUE_AUTO_CONTROL, .size = 1, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN, .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN, }, { .id = V4L2_CID_EXPOSURE_AUTO, .name = "Exposure, Auto", .entity = UVC_GUID_UVC_CAMERA, .selector = CT_AE_MODE_CONTROL, .size = 4, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_MENU, .data_type = UVC_CTRL_DATA_TYPE_BITMASK, .menu_info = exposure_auto_controls, .menu_count = ARRAY_SIZE(exposure_auto_controls), }, { .id = V4L2_CID_EXPOSURE_AUTO_PRIORITY, .name = "Exposure, Auto Priority", .entity = UVC_GUID_UVC_CAMERA, .selector = CT_AE_PRIORITY_CONTROL, .size = 1, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN, .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN, }, { .id = V4L2_CID_EXPOSURE_ABSOLUTE, .name = "Exposure (Absolute)", .entity = UVC_GUID_UVC_CAMERA, .selector = CT_EXPOSURE_TIME_ABSOLUTE_CONTROL, .size = 32, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_INTEGER, .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, }, { .id = V4L2_CID_AUTO_WHITE_BALANCE, .name = "White Balance Temperature, Auto", .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL, .size = 1, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN, .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN, }, { .id = V4L2_CID_WHITE_BALANCE_TEMPERATURE, .name = "White Balance Temperature", .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_WHITE_BALANCE_TEMPERATURE_CONTROL, .size = 16, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_INTEGER, .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, }, { .id = V4L2_CID_AUTO_WHITE_BALANCE, .name = "White Balance Component, Auto", .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL, .size = 1, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN, .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN, }, { .id = V4L2_CID_BLUE_BALANCE, .name = "White Balance Blue Component", .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_WHITE_BALANCE_COMPONENT_CONTROL, .size = 16, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_INTEGER, .data_type = UVC_CTRL_DATA_TYPE_SIGNED, }, { .id = V4L2_CID_RED_BALANCE, .name = "White Balance Red Component", .entity = UVC_GUID_UVC_PROCESSING, .selector = PU_WHITE_BALANCE_COMPONENT_CONTROL, .size = 16, .offset = 16, .v4l2_type = V4L2_CTRL_TYPE_INTEGER, .data_type = UVC_CTRL_DATA_TYPE_SIGNED, }, { .id = V4L2_CID_FOCUS_ABSOLUTE, .name = "Focus (absolute)", .entity = UVC_GUID_UVC_CAMERA, .selector = CT_FOCUS_ABSOLUTE_CONTROL, .size = 16, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_INTEGER, .data_type = UVC_CTRL_DATA_TYPE_UNSIGNED, }, { .id = V4L2_CID_FOCUS_AUTO, .name = "Focus, Auto", .entity = UVC_GUID_UVC_CAMERA, .selector = CT_FOCUS_AUTO_CONTROL, .size = 1, .offset = 0, .v4l2_type = V4L2_CTRL_TYPE_BOOLEAN, .data_type = UVC_CTRL_DATA_TYPE_BOOLEAN, }, }; /* ------------------------------------------------------------------------ * Utility functions */ static inline __u8 *uvc_ctrl_data(struct uvc_control *ctrl, int id) { return ctrl->data + id * ctrl->info->size; } static inline int uvc_get_bit(const __u8 *data, int bit) { return (data[bit >> 3] >> (bit & 7)) & 1; } /* Extract the bit string specified by mapping->offset and mapping->size * from the little-endian data stored at 'data' and return the result as * 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) { int bits = mapping->size; int offset = mapping->offset; __s32 value = 0; __u8 mask; data += offset / 8; offset &= 7; mask = ((1LL << bits) - 1) << offset; for (; bits > 0; data++) { __u8 byte = *data & mask; value |= offset > 0 ? (byte >> offset) : (byte << (-offset)); bits -= 8 - (offset > 0 ? offset : 0); offset -= 8; mask = (1 << bits) - 1; } /* Sign-extend the value if needed */ if (mapping->data_type == UVC_CTRL_DATA_TYPE_SIGNED) value |= -(value & (1 << (mapping->size - 1))); return value; } /* 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) { int bits = mapping->size; int offset = mapping->offset; __u8 mask; data += offset / 8; offset &= 7; for (; bits > 0; data++) { mask = ((1LL << bits) - 1) << offset; *data = (*data & ~mask) | ((value << offset) & mask); value >>= offset ? offset : 8; bits -= 8 - offset; offset = 0; } } /* ------------------------------------------------------------------------ * Terminal and unit management */ static const __u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING; static const __u8 uvc_camera_guid[16] = UVC_GUID_UVC_CAMERA; static const __u8 uvc_media_transport_input_guid[16] = UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT; static int uvc_entity_match_guid(struct uvc_entity *entity, __u8 guid[16]) { switch (UVC_ENTITY_TYPE(entity)) { case ITT_CAMERA: return memcmp(uvc_camera_guid, guid, 16) == 0; case ITT_MEDIA_TRANSPORT_INPUT: return memcmp(uvc_media_transport_input_guid, guid, 16) == 0; case VC_PROCESSING_UNIT: return memcmp(uvc_processing_guid, guid, 16) == 0; case VC_EXTENSION_UNIT: return memcmp(entity->extension.guidExtensionCode, guid, 16) == 0; default: return 0; } } /* ------------------------------------------------------------------------ * UVC Controls */ static void __uvc_find_control(struct uvc_entity *entity, __u32 v4l2_id, struct uvc_control_mapping **mapping, struct uvc_control **control, int next) { struct uvc_control *ctrl; struct uvc_control_mapping *map; unsigned int i; if (entity == NULL) return; for (i = 0; i < entity->ncontrols; ++i) { ctrl = &entity->controls[i]; if (ctrl->info == NULL) continue; list_for_each_entry(map, &ctrl->info->mappings, list) { if ((map->id == v4l2_id) && !next) { *control = ctrl; *mapping = map; return; } if ((*mapping == NULL || (*mapping)->id > map->id) && (map->id > v4l2_id) && next) { *control = ctrl; *mapping = map; } } } } struct uvc_control *uvc_find_control(struct uvc_video_device *video, __u32 v4l2_id, struct uvc_control_mapping **mapping) { struct uvc_control *ctrl = NULL; struct uvc_entity *entity; int next = v4l2_id & V4L2_CTRL_FLAG_NEXT_CTRL; *mapping = NULL; /* Mask the query flags. */ v4l2_id &= V4L2_CTRL_ID_MASK; /* Find the control. */ __uvc_find_control(video->processing, v4l2_id, mapping, &ctrl, next); if (ctrl && !next) return ctrl; list_for_each_entry(entity, &video->iterms, chain) { __uvc_find_control(entity, v4l2_id, mapping, &ctrl, next); if (ctrl && !next) return ctrl; } list_for_each_entry(entity, &video->extensions, chain) { __uvc_find_control(entity, v4l2_id, mapping, &ctrl, next); if (ctrl && !next) return ctrl; } if (ctrl == NULL && !next) uvc_trace(UVC_TRACE_CONTROL, "Control 0x%08x not found.\n", v4l2_id); return ctrl; } int uvc_query_v4l2_ctrl(struct uvc_video_device *video, struct v4l2_queryctrl *v4l2_ctrl) { struct uvc_control *ctrl; struct uvc_control_mapping *mapping; struct uvc_menu_info *menu; unsigned int i; __u8 data[8]; int ret; ctrl = uvc_find_control(video, v4l2_ctrl->id, &mapping); if (ctrl == NULL) return -EINVAL; v4l2_ctrl->id = mapping->id; v4l2_ctrl->type = mapping->v4l2_type; strncpy(v4l2_ctrl->name, mapping->name, sizeof v4l2_ctrl->name); v4l2_ctrl->flags = 0; if (!(ctrl->info->flags & UVC_CONTROL_SET_CUR)) v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY; if (ctrl->info->flags & UVC_CONTROL_GET_DEF) { if ((ret = uvc_query_ctrl(video->dev, GET_DEF, ctrl->entity->id, video->dev->intfnum, ctrl->info->selector, &data, ctrl->info->size)) < 0) return ret; v4l2_ctrl->default_value = uvc_get_le_value(data, mapping); } if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) { v4l2_ctrl->minimum = 0; v4l2_ctrl->maximum = mapping->menu_count - 1; v4l2_ctrl->step = 1; menu = mapping->menu_info; for (i = 0; i < mapping->menu_count; ++i, ++menu) { if (menu->value == v4l2_ctrl->default_value) { v4l2_ctrl->default_value = i; break; } } return 0; } if (ctrl->info->flags & UVC_CONTROL_GET_MIN) { if ((ret = uvc_query_ctrl(video->dev, GET_MIN, ctrl->entity->id, video->dev->intfnum, ctrl->info->selector, &data, ctrl->info->size)) < 0) return ret; v4l2_ctrl->minimum = uvc_get_le_value(data, mapping); } 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) return ret; v4l2_ctrl->maximum = uvc_get_le_value(data, mapping); } 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) return ret; v4l2_ctrl->step = uvc_get_le_value(data, mapping); } return 0; } /* -------------------------------------------------------------------------- * Control transactions * * To make extended set operations as atomic as the hardware allows, controls * are handled using begin/commit/rollback operations. * * At the beginning of a set request, uvc_ctrl_begin should be called to * initialize the request. This function acquires the control lock. * * When setting a control, the new value is stored in the control data field * at position UVC_CTRL_DATA_CURRENT. The control is then marked as dirty for * later processing. If the UVC and V4L2 control sizes differ, the current * value is loaded from the hardware before storing the new value in the data * field. * * After processing all controls in the transaction, uvc_ctrl_commit or * uvc_ctrl_rollback must be called to apply the pending changes to the * hardware or revert them. When applying changes, all controls marked as * dirty will be modified in the UVC device, and the dirty flag will be * cleared. When reverting controls, the control data field * UVC_CTRL_DATA_CURRENT is reverted to its previous value * (UVC_CTRL_DATA_BACKUP) for all dirty controls. Both functions release the * control lock. */ int uvc_ctrl_begin(struct uvc_video_device *video) { return mutex_lock_interruptible(&video->ctrl_mutex) ? -ERESTARTSYS : 0; } static int uvc_ctrl_commit_entity(struct uvc_device *dev, struct uvc_entity *entity, int rollback) { struct uvc_control *ctrl; unsigned int i; int ret; if (entity == NULL) return 0; for (i = 0; i < entity->ncontrols; ++i) { ctrl = &entity->controls[i]; if (ctrl->info == NULL || !ctrl->dirty) continue; if (!rollback) ret = uvc_query_ctrl(dev, SET_CUR, ctrl->entity->id, dev->intfnum, ctrl->info->selector, uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), ctrl->info->size); else ret = 0; if (rollback || ret < 0) memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP), ctrl->info->size); if ((ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0) ctrl->loaded = 0; ctrl->dirty = 0; if (ret < 0) return ret; } return 0; } int __uvc_ctrl_commit(struct uvc_video_device *video, int rollback) { struct uvc_entity *entity; int ret = 0; /* Find the control. */ ret = uvc_ctrl_commit_entity(video->dev, video->processing, rollback); if (ret < 0) goto done; list_for_each_entry(entity, &video->iterms, chain) { ret = uvc_ctrl_commit_entity(video->dev, entity, rollback); if (ret < 0) goto done; } list_for_each_entry(entity, &video->extensions, chain) { ret = uvc_ctrl_commit_entity(video->dev, entity, rollback); if (ret < 0) goto done; } done: mutex_unlock(&video->ctrl_mutex); return ret; } int uvc_ctrl_get(struct uvc_video_device *video, struct v4l2_ext_control *xctrl) { struct uvc_control *ctrl; struct uvc_control_mapping *mapping; struct uvc_menu_info *menu; unsigned int i; int ret; ctrl = uvc_find_control(video, xctrl->id, &mapping); if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0) return -EINVAL; if (!ctrl->loaded) { ret = uvc_query_ctrl(video->dev, GET_CUR, ctrl->entity->id, video->dev->intfnum, ctrl->info->selector, uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), ctrl->info->size); if (ret < 0) return ret; if ((ctrl->info->flags & UVC_CONTROL_AUTO_UPDATE) == 0) ctrl->loaded = 1; } xctrl->value = uvc_get_le_value( uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), mapping); if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) { menu = mapping->menu_info; for (i = 0; i < mapping->menu_count; ++i, ++menu) { if (menu->value == xctrl->value) { xctrl->value = i; break; } } } return 0; } int uvc_ctrl_set(struct uvc_video_device *video, struct v4l2_ext_control *xctrl) { struct uvc_control *ctrl; struct uvc_control_mapping *mapping; s32 value = xctrl->value; int ret; ctrl = uvc_find_control(video, xctrl->id, &mapping); if (ctrl == NULL || (ctrl->info->flags & UVC_CONTROL_SET_CUR) == 0) return -EINVAL; if (mapping->v4l2_type == V4L2_CTRL_TYPE_MENU) { if (value < 0 || value >= mapping->menu_count) return -EINVAL; value = mapping->menu_info[value].value; } if (!ctrl->loaded && (ctrl->info->size * 8) != mapping->size) { if ((ctrl->info->flags & UVC_CONTROL_GET_CUR) == 0) { memset(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), 0, ctrl->info->size); } else { ret = uvc_query_ctrl(video->dev, GET_CUR, ctrl->entity->id, video->dev->intfnum, ctrl->info->selector, uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), ctrl->info->size); if (ret < 0) return ret; } if ((ctrl->info->flags & UVC_CONTROL_AUTO_UPDATE) == 0) ctrl->loaded = 1; } if (!ctrl->dirty) { memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP), uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), ctrl->info->size); } uvc_set_le_value(value, uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), mapping); ctrl->dirty = 1; ctrl->modified = 1; return 0; } /* -------------------------------------------------------------------------- * Dynamic controls */ int uvc_xu_ctrl_query(struct uvc_video_device *video, struct uvc_xu_control *xctrl, int set) { struct uvc_entity *entity; struct uvc_control *ctrl = NULL; unsigned int i, found = 0; __u8 *data; int ret; /* Find the extension unit. */ list_for_each_entry(entity, &video->extensions, chain) { if (entity->id == xctrl->unit) break; } if (entity->id != xctrl->unit) { uvc_trace(UVC_TRACE_CONTROL, "Extension unit %u not found.\n", xctrl->unit); return -EINVAL; } /* Find the control. */ for (i = 0; i < entity->ncontrols; ++i) { ctrl = &entity->controls[i]; if (ctrl->info == NULL) continue; if (ctrl->info->selector == xctrl->selector) { found = 1; break; } } if (!found) { uvc_trace(UVC_TRACE_CONTROL, "Control " UVC_GUID_FORMAT "/%u not found.\n", UVC_GUID_ARGS(entity->extension.guidExtensionCode), xctrl->selector); return -EINVAL; } /* Validate control data size. */ if (ctrl->info->size != xctrl->size) return -EINVAL; if ((set && !(ctrl->info->flags & UVC_CONTROL_SET_CUR)) || (!set && !(ctrl->info->flags & UVC_CONTROL_GET_CUR))) return -EINVAL; if (mutex_lock_interruptible(&video->ctrl_mutex)) return -ERESTARTSYS; memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP), uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), xctrl->size); data = uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT); if (set && copy_from_user(data, xctrl->data, xctrl->size)) { ret = -EFAULT; goto out; } ret = uvc_query_ctrl(video->dev, set ? SET_CUR : GET_CUR, xctrl->unit, video->dev->intfnum, xctrl->selector, data, xctrl->size); if (ret < 0) goto out; if (!set && copy_to_user(xctrl->data, data, xctrl->size)) { ret = -EFAULT; goto out; } out: if (ret) memcpy(uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT), uvc_ctrl_data(ctrl, UVC_CTRL_DATA_BACKUP), xctrl->size); mutex_unlock(&video->ctrl_mutex); return ret; } /* -------------------------------------------------------------------------- * Suspend/resume */ /* * Restore control values after resume, skipping controls that haven't been * changed. * * TODO * - Don't restore modified controls that are back to their default value. * - Handle restore order (Auto-Exposure Mode should be restored before * Exposure Time). */ int uvc_ctrl_resume_device(struct uvc_device *dev) { struct uvc_control *ctrl; struct uvc_entity *entity; unsigned int i; int ret; /* Walk the entities list and restore controls when possible. */ list_for_each_entry(entity, &dev->entities, list) { for (i = 0; i < entity->ncontrols; ++i) { ctrl = &entity->controls[i]; if (ctrl->info == NULL || !ctrl->modified || (ctrl->info->flags & UVC_CONTROL_RESTORE) == 0) continue; printk(KERN_INFO "restoring control " UVC_GUID_FORMAT "/%u/%u\n", UVC_GUID_ARGS(ctrl->info->entity), ctrl->info->index, ctrl->info->selector); ctrl->dirty = 1; } ret = uvc_ctrl_commit_entity(dev, entity, 0); if (ret < 0) return ret; } return 0; } /* -------------------------------------------------------------------------- * Control and mapping handling */ static void uvc_ctrl_add_ctrl(struct uvc_device *dev, struct uvc_control_info *info) { struct uvc_entity *entity; struct uvc_control *ctrl = NULL; int ret, found = 0; unsigned int i; list_for_each_entry(entity, &dev->entities, list) { if (!uvc_entity_match_guid(entity, info->entity)) continue; for (i = 0; i < entity->ncontrols; ++i) { ctrl = &entity->controls[i]; if (ctrl->index == info->index) { found = 1; break; } } if (found) break; } if (!found) return; if (UVC_ENTITY_TYPE(entity) == VC_EXTENSION_UNIT) { /* Check if the device control information and length match * the user supplied information. */ __u32 flags; __le16 size; __u8 inf; if ((ret = uvc_query_ctrl(dev, GET_LEN, ctrl->entity->id, dev->intfnum, info->selector, (__u8 *)&size, 2)) < 0) { uvc_trace(UVC_TRACE_CONTROL, "GET_LEN failed on " "control " UVC_GUID_FORMAT "/%u (%d).\n", UVC_GUID_ARGS(info->entity), info->selector, ret); return; } if (info->size != le16_to_cpu(size)) { uvc_trace(UVC_TRACE_CONTROL, "Control " UVC_GUID_FORMAT "/%u size doesn't match user supplied " "value.\n", UVC_GUID_ARGS(info->entity), info->selector); return; } if ((ret = uvc_query_ctrl(dev, GET_INFO, ctrl->entity->id, dev->intfnum, info->selector, &inf, 1)) < 0) { uvc_trace(UVC_TRACE_CONTROL, "GET_INFO failed on " "control " UVC_GUID_FORMAT "/%u (%d).\n", UVC_GUID_ARGS(info->entity), info->selector, ret); return; } flags = info->flags; if (((flags & UVC_CONTROL_GET_CUR) && !(inf & (1 << 0))) || ((flags & UVC_CONTROL_SET_CUR) && !(inf & (1 << 1)))) { uvc_trace(UVC_TRACE_CONTROL, "Control " UVC_GUID_FORMAT "/%u flags don't match " "supported operations.\n", UVC_GUID_ARGS(info->entity), info->selector); return; } } ctrl->info = info; ctrl->data = kmalloc(ctrl->info->size * UVC_CTRL_NDATA, GFP_KERNEL); uvc_trace(UVC_TRACE_CONTROL, "Added control " UVC_GUID_FORMAT "/%u " "to device %s entity %u\n", UVC_GUID_ARGS(ctrl->info->entity), ctrl->info->selector, dev->udev->devpath, entity->id); } /* * Add an item to the UVC control information list, and instantiate a control * structure for each device that supports the control. */ int uvc_ctrl_add_info(struct uvc_control_info *info) { struct uvc_control_info *ctrl; struct uvc_device *dev; int ret = 0; /* Find matching controls by walking the devices, entities and * controls list. */ mutex_lock(&uvc_driver.ctrl_mutex); /* First check if the list contains a control matching the new one. * Bail out if it does. */ list_for_each_entry(ctrl, &uvc_driver.controls, list) { if (memcmp(ctrl->entity, info->entity, 16)) continue; if (ctrl->selector == info->selector) { uvc_trace(UVC_TRACE_CONTROL, "Control " UVC_GUID_FORMAT "/%u is already defined.\n", UVC_GUID_ARGS(info->entity), info->selector); ret = -EEXIST; goto end; } if (ctrl->index == info->index) { uvc_trace(UVC_TRACE_CONTROL, "Control " UVC_GUID_FORMAT "/%u would overwrite index " "%d.\n", UVC_GUID_ARGS(info->entity), info->selector, info->index); ret = -EEXIST; goto end; } } list_for_each_entry(dev, &uvc_driver.devices, list) uvc_ctrl_add_ctrl(dev, info); INIT_LIST_HEAD(&info->mappings); list_add_tail(&info->list, &uvc_driver.controls); end: mutex_unlock(&uvc_driver.ctrl_mutex); return ret; } int uvc_ctrl_add_mapping(struct uvc_control_mapping *mapping) { struct uvc_control_info *info; struct uvc_control_mapping *map; int ret = -EINVAL; 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, mapping->id); return -EINVAL; } mutex_lock(&uvc_driver.ctrl_mutex); list_for_each_entry(info, &uvc_driver.controls, list) { if (memcmp(info->entity, mapping->entity, 16) || info->selector != mapping->selector) continue; if (info->size * 8 < mapping->size + mapping->offset) { uvc_trace(UVC_TRACE_CONTROL, "Mapping '%s' would " "overflow control " UVC_GUID_FORMAT "/%u\n", mapping->name, UVC_GUID_ARGS(info->entity), info->selector); ret = -EOVERFLOW; goto end; } /* Check if the list contains a mapping matching the new one. * Bail out if it does. */ list_for_each_entry(map, &info->mappings, list) { if (map->id == mapping->id) { uvc_trace(UVC_TRACE_CONTROL, "Mapping '%s' is " "already defined.\n", mapping->name); ret = -EEXIST; goto end; } } mapping->ctrl = info; list_add_tail(&mapping->list, &info->mappings); uvc_trace(UVC_TRACE_CONTROL, "Adding mapping %s to control " UVC_GUID_FORMAT "/%u.\n", mapping->name, UVC_GUID_ARGS(info->entity), info->selector); ret = 0; break; } end: mutex_unlock(&uvc_driver.ctrl_mutex); return ret; } /* * Initialize device controls. */ int uvc_ctrl_init_device(struct uvc_device *dev) { struct uvc_control_info *info; struct uvc_control *ctrl; struct uvc_entity *entity; unsigned int i; /* Walk the entities list and instantiate controls */ list_for_each_entry(entity, &dev->entities, list) { unsigned int bControlSize = 0, ncontrols = 0; __u8 *bmControls = NULL; if (UVC_ENTITY_TYPE(entity) == VC_EXTENSION_UNIT) { bmControls = entity->extension.bmControls; bControlSize = entity->extension.bControlSize; } else if (UVC_ENTITY_TYPE(entity) == VC_PROCESSING_UNIT) { bmControls = entity->processing.bmControls; bControlSize = entity->processing.bControlSize; } else if (UVC_ENTITY_TYPE(entity) == ITT_CAMERA) { bmControls = entity->camera.bmControls; bControlSize = entity->camera.bControlSize; } for (i = 0; i < bControlSize; ++i) ncontrols += hweight8(bmControls[i]); if (ncontrols == 0) continue; entity->controls = kzalloc(ncontrols*sizeof *ctrl, GFP_KERNEL); if (entity->controls == NULL) return -ENOMEM; entity->ncontrols = ncontrols; ctrl = entity->controls; for (i = 0; i < bControlSize * 8; ++i) { if (uvc_get_bit(bmControls, i) == 0) continue; ctrl->entity = entity; ctrl->index = i; ctrl++; } } /* Walk the controls info list and associate them with the device * controls, then add the device to the global device list. This has * to be done while holding the controls lock, to make sure * uvc_ctrl_add_info() will not get called in-between. */ mutex_lock(&uvc_driver.ctrl_mutex); list_for_each_entry(info, &uvc_driver.controls, list) uvc_ctrl_add_ctrl(dev, info); list_add_tail(&dev->list, &uvc_driver.devices); mutex_unlock(&uvc_driver.ctrl_mutex); return 0; } /* * Cleanup device controls. */ void uvc_ctrl_cleanup_device(struct uvc_device *dev) { struct uvc_entity *entity; unsigned int i; /* Remove the device from the global devices list */ mutex_lock(&uvc_driver.ctrl_mutex); if (dev->list.next != NULL) list_del(&dev->list); mutex_unlock(&uvc_driver.ctrl_mutex); list_for_each_entry(entity, &dev->entities, list) { for (i = 0; i < entity->ncontrols; ++i) kfree(entity->controls[i].data); kfree(entity->controls); } } void uvc_ctrl_init(void) { struct uvc_control_info *ctrl = uvc_ctrls; struct uvc_control_info *cend = ctrl + ARRAY_SIZE(uvc_ctrls); struct uvc_control_mapping *mapping = uvc_ctrl_mappings; struct uvc_control_mapping *mend = mapping + ARRAY_SIZE(uvc_ctrl_mappings); for (; ctrl < cend; ++ctrl) uvc_ctrl_add_info(ctrl); for (; mapping < mend; ++mapping) uvc_ctrl_add_mapping(mapping); }