[media] v4l2-ctrls: create type_ops
Since compound controls can have non-standard types we need to be able to do type-specific checks etc. In order to make that easy type operations are added. There are four operations: - equal: check if two values are equal - init: initialize a value - log: log the value - validate: validate a new value The v4l2_ctrl struct adds p_new and p_cur unions at the end of the struct. This union provides a standard way of accessing control types through a pointer, which greatly simplifies internal control processing. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Hans Verkuil
Mauro Carvalho Chehab
Родитель
e6bee3685e
Коммит
0176077a81
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@ -1161,6 +1161,149 @@ static void send_event(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, u32 changes)
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v4l2_event_queue_fh(sev->fh, &ev);
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}
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static bool std_equal(const struct v4l2_ctrl *ctrl,
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union v4l2_ctrl_ptr ptr1,
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union v4l2_ctrl_ptr ptr2)
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{
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switch (ctrl->type) {
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case V4L2_CTRL_TYPE_BUTTON:
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return false;
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case V4L2_CTRL_TYPE_STRING:
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/* strings are always 0-terminated */
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return !strcmp(ptr1.p_char, ptr2.p_char);
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case V4L2_CTRL_TYPE_INTEGER64:
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return *ptr1.p_s64 == *ptr2.p_s64;
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default:
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if (ctrl->is_ptr)
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return !memcmp(ptr1.p, ptr2.p, ctrl->elem_size);
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return *ptr1.p_s32 == *ptr2.p_s32;
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}
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}
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static void std_init(const struct v4l2_ctrl *ctrl,
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union v4l2_ctrl_ptr ptr)
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{
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switch (ctrl->type) {
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case V4L2_CTRL_TYPE_STRING:
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memset(ptr.p_char, ' ', ctrl->minimum);
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ptr.p_char[ctrl->minimum] = '\0';
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break;
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case V4L2_CTRL_TYPE_INTEGER64:
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*ptr.p_s64 = ctrl->default_value;
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break;
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case V4L2_CTRL_TYPE_INTEGER:
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case V4L2_CTRL_TYPE_INTEGER_MENU:
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case V4L2_CTRL_TYPE_MENU:
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case V4L2_CTRL_TYPE_BITMASK:
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case V4L2_CTRL_TYPE_BOOLEAN:
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*ptr.p_s32 = ctrl->default_value;
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break;
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default:
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break;
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}
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}
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static void std_log(const struct v4l2_ctrl *ctrl)
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{
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union v4l2_ctrl_ptr ptr = ctrl->p_cur;
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switch (ctrl->type) {
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case V4L2_CTRL_TYPE_INTEGER:
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pr_cont("%d", *ptr.p_s32);
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break;
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case V4L2_CTRL_TYPE_BOOLEAN:
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pr_cont("%s", *ptr.p_s32 ? "true" : "false");
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break;
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case V4L2_CTRL_TYPE_MENU:
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pr_cont("%s", ctrl->qmenu[*ptr.p_s32]);
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break;
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case V4L2_CTRL_TYPE_INTEGER_MENU:
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pr_cont("%lld", ctrl->qmenu_int[*ptr.p_s32]);
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break;
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case V4L2_CTRL_TYPE_BITMASK:
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pr_cont("0x%08x", *ptr.p_s32);
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break;
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case V4L2_CTRL_TYPE_INTEGER64:
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pr_cont("%lld", *ptr.p_s64);
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break;
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case V4L2_CTRL_TYPE_STRING:
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pr_cont("%s", ptr.p_char);
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break;
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default:
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pr_cont("unknown type %d", ctrl->type);
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break;
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}
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}
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/* Round towards the closest legal value */
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#define ROUND_TO_RANGE(val, offset_type, ctrl) \
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({ \
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offset_type offset; \
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val += (ctrl)->step / 2; \
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val = clamp_t(typeof(val), val, \
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(ctrl)->minimum, (ctrl)->maximum); \
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offset = (val) - (ctrl)->minimum; \
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offset = (ctrl)->step * (offset / (ctrl)->step); \
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val = (ctrl)->minimum + offset; \
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0; \
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})
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/* Validate a new control */
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static int std_validate(const struct v4l2_ctrl *ctrl,
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union v4l2_ctrl_ptr ptr)
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{
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size_t len;
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switch (ctrl->type) {
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case V4L2_CTRL_TYPE_INTEGER:
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return ROUND_TO_RANGE(*ptr.p_s32, u32, ctrl);
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case V4L2_CTRL_TYPE_INTEGER64:
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return ROUND_TO_RANGE(*ptr.p_s64, u64, ctrl);
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case V4L2_CTRL_TYPE_BOOLEAN:
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*ptr.p_s32 = !!*ptr.p_s32;
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return 0;
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case V4L2_CTRL_TYPE_MENU:
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case V4L2_CTRL_TYPE_INTEGER_MENU:
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if (*ptr.p_s32 < ctrl->minimum || *ptr.p_s32 > ctrl->maximum)
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return -ERANGE;
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if (ctrl->menu_skip_mask & (1 << *ptr.p_s32))
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return -EINVAL;
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if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
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ctrl->qmenu[*ptr.p_s32][0] == '\0')
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return -EINVAL;
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return 0;
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case V4L2_CTRL_TYPE_BITMASK:
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*ptr.p_s32 &= ctrl->maximum;
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return 0;
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case V4L2_CTRL_TYPE_BUTTON:
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case V4L2_CTRL_TYPE_CTRL_CLASS:
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*ptr.p_s32 = 0;
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return 0;
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case V4L2_CTRL_TYPE_STRING:
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len = strlen(ptr.p_char);
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if (len < ctrl->minimum)
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return -ERANGE;
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if ((len - ctrl->minimum) % ctrl->step)
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return -ERANGE;
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return 0;
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default:
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return -EINVAL;
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}
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}
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static const struct v4l2_ctrl_type_ops std_type_ops = {
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.equal = std_equal,
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.init = std_init,
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.log = std_log,
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.validate = std_validate,
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};
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/* Helper function: copy the current control value back to the caller */
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static int cur_to_user(struct v4l2_ext_control *c,
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struct v4l2_ctrl *ctrl)
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@ -1344,21 +1487,7 @@ static int cluster_changed(struct v4l2_ctrl *master)
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if (ctrl == NULL)
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continue;
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switch (ctrl->type) {
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case V4L2_CTRL_TYPE_BUTTON:
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/* Button controls are always 'different' */
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return 1;
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case V4L2_CTRL_TYPE_STRING:
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/* strings are always 0-terminated */
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diff = strcmp(ctrl->string, ctrl->cur.string);
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break;
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case V4L2_CTRL_TYPE_INTEGER64:
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diff = ctrl->val64 != ctrl->cur.val64;
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break;
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default:
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diff = ctrl->val != ctrl->cur.val;
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break;
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}
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diff = !ctrl->type_ops->equal(ctrl, ctrl->p_cur, ctrl->p_new);
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}
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return diff;
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}
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@ -1399,65 +1528,30 @@ static int check_range(enum v4l2_ctrl_type type,
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}
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}
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/* Round towards the closest legal value */
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#define ROUND_TO_RANGE(val, offset_type, ctrl) \
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({ \
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offset_type offset; \
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val += (ctrl)->step / 2; \
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val = clamp_t(typeof(val), val, \
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(ctrl)->minimum, (ctrl)->maximum); \
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offset = (val) - (ctrl)->minimum; \
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offset = (ctrl)->step * (offset / (ctrl)->step); \
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val = (ctrl)->minimum + offset; \
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0; \
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})
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/* Validate a new control */
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static int validate_new(const struct v4l2_ctrl *ctrl,
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struct v4l2_ext_control *c)
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{
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size_t len;
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union v4l2_ctrl_ptr ptr;
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switch (ctrl->type) {
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case V4L2_CTRL_TYPE_INTEGER:
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return ROUND_TO_RANGE(*(s32 *)&c->value, u32, ctrl);
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case V4L2_CTRL_TYPE_INTEGER64:
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return ROUND_TO_RANGE(*(s64 *)&c->value64, u64, ctrl);
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case V4L2_CTRL_TYPE_BOOLEAN:
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c->value = !!c->value;
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return 0;
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case V4L2_CTRL_TYPE_MENU:
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case V4L2_CTRL_TYPE_INTEGER_MENU:
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if (c->value < ctrl->minimum || c->value > ctrl->maximum)
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return -ERANGE;
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if (ctrl->menu_skip_mask & (1 << c->value))
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return -EINVAL;
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if (ctrl->type == V4L2_CTRL_TYPE_MENU &&
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ctrl->qmenu[c->value][0] == '\0')
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return -EINVAL;
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return 0;
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case V4L2_CTRL_TYPE_MENU:
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case V4L2_CTRL_TYPE_BITMASK:
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c->value &= ctrl->maximum;
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return 0;
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case V4L2_CTRL_TYPE_BOOLEAN:
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case V4L2_CTRL_TYPE_BUTTON:
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case V4L2_CTRL_TYPE_CTRL_CLASS:
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c->value = 0;
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return 0;
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ptr.p_s32 = &c->value;
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return ctrl->type_ops->validate(ctrl, ptr);
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case V4L2_CTRL_TYPE_STRING:
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len = strlen(c->string);
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if (len < ctrl->minimum)
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return -ERANGE;
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if ((len - ctrl->minimum) % ctrl->step)
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return -ERANGE;
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return 0;
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case V4L2_CTRL_TYPE_INTEGER64:
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ptr.p_s64 = &c->value64;
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return ctrl->type_ops->validate(ctrl, ptr);
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default:
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return -EINVAL;
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ptr.p = c->ptr;
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return ctrl->type_ops->validate(ctrl, ptr);
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}
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}
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@ -1674,6 +1768,7 @@ unlock:
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/* Add a new control */
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static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
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const struct v4l2_ctrl_ops *ops,
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const struct v4l2_ctrl_type_ops *type_ops,
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u32 id, const char *name, enum v4l2_ctrl_type type,
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s64 min, s64 max, u64 step, s64 def,
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u32 elem_size,
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@ -1731,6 +1826,7 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
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INIT_LIST_HEAD(&ctrl->ev_subs);
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ctrl->handler = hdl;
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ctrl->ops = ops;
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ctrl->type_ops = type_ops ? type_ops : &std_type_ops;
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ctrl->id = id;
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ctrl->name = name;
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ctrl->type = type;
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@ -1751,16 +1847,16 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
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ctrl->cur.val = ctrl->val = def;
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data = &ctrl->cur + 1;
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if (ctrl->is_string) {
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ctrl->string = data;
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ctrl->cur.string = data + elem_size;
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if (ctrl->minimum)
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memset(ctrl->cur.string, ' ', ctrl->minimum);
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} else if (ctrl->is_ptr) {
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ctrl->p = data;
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ctrl->cur.p = data + elem_size;
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if (ctrl->is_ptr) {
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ctrl->p = ctrl->p_new.p = data;
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ctrl->p_cur.p = data + elem_size;
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} else {
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ctrl->p_new.p = &ctrl->val;
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ctrl->p_cur.p = &ctrl->cur.val;
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}
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ctrl->type_ops->init(ctrl, ctrl->p_cur);
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ctrl->type_ops->init(ctrl, ctrl->p_new);
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if (handler_new_ref(hdl, ctrl)) {
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kfree(ctrl);
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return NULL;
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@ -1804,7 +1900,7 @@ struct v4l2_ctrl *v4l2_ctrl_new_custom(struct v4l2_ctrl_handler *hdl,
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return NULL;
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}
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ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->id, name,
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ctrl = v4l2_ctrl_new(hdl, cfg->ops, cfg->type_ops, cfg->id, name,
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type, min, max,
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is_menu ? cfg->menu_skip_mask : step,
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def, cfg->elem_size,
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@ -1831,7 +1927,7 @@ struct v4l2_ctrl *v4l2_ctrl_new_std(struct v4l2_ctrl_handler *hdl,
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handler_set_err(hdl, -EINVAL);
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return NULL;
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}
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return v4l2_ctrl_new(hdl, ops, id, name, type,
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return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
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min, max, step, def, 0,
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flags, NULL, NULL, NULL);
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}
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@ -1864,7 +1960,7 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu(struct v4l2_ctrl_handler *hdl,
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handler_set_err(hdl, -EINVAL);
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return NULL;
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}
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return v4l2_ctrl_new(hdl, ops, id, name, type,
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return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
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0, max, mask, def, 0,
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flags, qmenu, qmenu_int, NULL);
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}
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@ -1896,7 +1992,8 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
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handler_set_err(hdl, -EINVAL);
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return NULL;
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}
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return v4l2_ctrl_new(hdl, ops, id, name, type, 0, max, mask, def,
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return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
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0, max, mask, def,
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0, flags, qmenu, NULL, NULL);
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}
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@ -1920,7 +2017,7 @@ struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
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handler_set_err(hdl, -EINVAL);
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return NULL;
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}
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return v4l2_ctrl_new(hdl, ops, id, name, type,
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return v4l2_ctrl_new(hdl, ops, NULL, id, name, type,
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0, max, 0, def, 0,
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flags, NULL, qmenu_int, NULL);
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}
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@ -2104,32 +2201,8 @@ static void log_ctrl(const struct v4l2_ctrl *ctrl,
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pr_info("%s%s%s: ", prefix, colon, ctrl->name);
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switch (ctrl->type) {
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case V4L2_CTRL_TYPE_INTEGER:
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pr_cont("%d", ctrl->cur.val);
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break;
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case V4L2_CTRL_TYPE_BOOLEAN:
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pr_cont("%s", ctrl->cur.val ? "true" : "false");
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break;
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case V4L2_CTRL_TYPE_MENU:
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pr_cont("%s", ctrl->qmenu[ctrl->cur.val]);
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break;
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case V4L2_CTRL_TYPE_INTEGER_MENU:
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pr_cont("%lld", ctrl->qmenu_int[ctrl->cur.val]);
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break;
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case V4L2_CTRL_TYPE_BITMASK:
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pr_cont("0x%08x", ctrl->cur.val);
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break;
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case V4L2_CTRL_TYPE_INTEGER64:
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pr_cont("%lld", ctrl->cur.val64);
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break;
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case V4L2_CTRL_TYPE_STRING:
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pr_cont("%s", ctrl->cur.string);
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break;
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default:
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pr_cont("unknown type %d", ctrl->type);
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break;
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}
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ctrl->type_ops->log(ctrl);
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if (ctrl->flags & (V4L2_CTRL_FLAG_INACTIVE |
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V4L2_CTRL_FLAG_GRABBED |
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V4L2_CTRL_FLAG_VOLATILE)) {
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@ -531,13 +531,12 @@ static void v4l_print_query_ext_ctrl(const void *arg, bool write_only)
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pr_cont("id=0x%x, type=%d, name=%.*s, min/max=%lld/%lld, "
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"step=%lld, default=%lld, flags=0x%08x, elem_size=%u, elems=%u, "
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"nr_of_dims=%u, dims=%u,%u,%u,%u,%u,%u,%u,%u\n",
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"nr_of_dims=%u, dims=%u,%u,%u,%u\n",
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p->id, p->type, (int)sizeof(p->name), p->name,
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p->minimum, p->maximum,
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p->step, p->default_value, p->flags,
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p->elem_size, p->elems, p->nr_of_dims,
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p->dims[0], p->dims[1], p->dims[2], p->dims[3],
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p->dims[4], p->dims[5], p->dims[6], p->dims[7]);
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p->dims[0], p->dims[1], p->dims[2], p->dims[3]);
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}
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static void v4l_print_querymenu(const void *arg, bool write_only)
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@ -36,6 +36,19 @@ struct v4l2_subscribed_event;
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struct v4l2_fh;
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struct poll_table_struct;
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/** union v4l2_ctrl_ptr - A pointer to a control value.
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* @p_s32: Pointer to a 32-bit signed value.
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* @p_s64: Pointer to a 64-bit signed value.
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* @p_char: Pointer to a string.
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* @p: Pointer to a compound value.
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*/
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union v4l2_ctrl_ptr {
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s32 *p_s32;
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s64 *p_s64;
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char *p_char;
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void *p;
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};
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/** struct v4l2_ctrl_ops - The control operations that the driver has to provide.
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* @g_volatile_ctrl: Get a new value for this control. Generally only relevant
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* for volatile (and usually read-only) controls such as a control
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@ -54,6 +67,23 @@ struct v4l2_ctrl_ops {
|
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int (*s_ctrl)(struct v4l2_ctrl *ctrl);
|
||||
};
|
||||
|
||||
/** struct v4l2_ctrl_type_ops - The control type operations that the driver has to provide.
|
||||
* @equal: return true if both values are equal.
|
||||
* @init: initialize the value.
|
||||
* @log: log the value.
|
||||
* @validate: validate the value. Return 0 on success and a negative value otherwise.
|
||||
*/
|
||||
struct v4l2_ctrl_type_ops {
|
||||
bool (*equal)(const struct v4l2_ctrl *ctrl,
|
||||
union v4l2_ctrl_ptr ptr1,
|
||||
union v4l2_ctrl_ptr ptr2);
|
||||
void (*init)(const struct v4l2_ctrl *ctrl,
|
||||
union v4l2_ctrl_ptr ptr);
|
||||
void (*log)(const struct v4l2_ctrl *ctrl);
|
||||
int (*validate)(const struct v4l2_ctrl *ctrl,
|
||||
union v4l2_ctrl_ptr ptr);
|
||||
};
|
||||
|
||||
typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv);
|
||||
|
||||
/** struct v4l2_ctrl - The control structure.
|
||||
|
|
@ -89,6 +119,7 @@ typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv);
|
|||
* value, then the whole cluster is in manual mode. Drivers should
|
||||
* never set this flag directly.
|
||||
* @ops: The control ops.
|
||||
* @type_ops: The control type ops.
|
||||
* @id: The control ID.
|
||||
* @name: The control name.
|
||||
* @type: The control type.
|
||||
|
|
@ -137,6 +168,7 @@ struct v4l2_ctrl {
|
|||
unsigned int manual_mode_value:8;
|
||||
|
||||
const struct v4l2_ctrl_ops *ops;
|
||||
const struct v4l2_ctrl_type_ops *type_ops;
|
||||
u32 id;
|
||||
const char *name;
|
||||
enum v4l2_ctrl_type type;
|
||||
|
|
@ -164,6 +196,9 @@ struct v4l2_ctrl {
|
|||
char *string;
|
||||
void *p;
|
||||
} cur;
|
||||
|
||||
union v4l2_ctrl_ptr p_new;
|
||||
union v4l2_ctrl_ptr p_cur;
|
||||
};
|
||||
|
||||
/** struct v4l2_ctrl_ref - The control reference.
|
||||
|
|
@ -217,6 +252,7 @@ struct v4l2_ctrl_handler {
|
|||
|
||||
/** struct v4l2_ctrl_config - Control configuration structure.
|
||||
* @ops: The control ops.
|
||||
* @type_ops: The control type ops. Only needed for compound controls.
|
||||
* @id: The control ID.
|
||||
* @name: The control name.
|
||||
* @type: The control type.
|
||||
|
|
@ -241,6 +277,7 @@ struct v4l2_ctrl_handler {
|
|||
*/
|
||||
struct v4l2_ctrl_config {
|
||||
const struct v4l2_ctrl_ops *ops;
|
||||
const struct v4l2_ctrl_type_ops *type_ops;
|
||||
u32 id;
|
||||
const char *name;
|
||||
enum v4l2_ctrl_type type;
|
||||
|
|
|
|||
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