bootctl: Enhance the UI to support a TKey

When unlocking an encrypted disk with a TKey we need a few more UI
operations:

- allow the password-entry textline to be shown/hidden
- allow showing instructions to the user, as well as unlock result
- obtain the password entered by the user

Add these to the API and implement them in the multi UI.

Signed-off-by: Simon Glass <simon.glass@canonical.com>

boot/bootctl/multi_ui.c

@@ -577,6 +577,86 @@ static int multiboot_ui_of_to_plat(struct udevice *dev)
 	return 0;
 }
 
+static int multiboot_ui_show_pass(struct udevice *dev, int seq, bool show)
+{
+	struct bc_ui_priv *upriv = dev_get_uclass_priv(dev);
+	struct scene *scn = upriv->scn;
+	int ret;
+
+	scene_obj_set_hide(scn, ITEM_PASS + seq, !show);
+	scene_obj_set_hide(scn, ITEM_PASS_LABEL + seq, !show);
+	scene_obj_set_hide(scn, ITEM_PASS_EDIT + seq, !show);
+
+	if (show) {
+		struct scene_obj_textline *tline;
+		char *buf;
+
+		/* Clear the passphrase buffer for retry */
+		tline = scene_obj_find(scn, ITEM_PASS + seq,
+				       SCENEOBJT_TEXTLINE);
+		if (!tline)
+			return log_msg_ret("tln", -ENOENT);
+		buf = abuf_data(&tline->buf);
+		*buf = '\0';
+
+		/* Set highlight and open the textline for editing */
+		scene_set_highlight_id(scn, ITEM_PASS + seq);
+		ret = scene_set_open(scn, ITEM_PASS + seq, true);
+		if (ret)
+			return log_msg_ret("sop", ret);
+	} else {
+		/* Close the textline */
+		ret = scene_set_open(scn, ITEM_PASS + seq, false);
+		if (ret)
+			return log_msg_ret("sop", ret);
+	}
+
+	return 0;
+}
+
+static int multiboot_ui_get_pass(struct udevice *dev, int seq,
+				 const char **passp)
+{
+	struct bc_ui_priv *upriv = dev_get_uclass_priv(dev);
+	struct scene *scn = upriv->scn;
+	struct scene_obj_textline *tline;
+
+	tline = scene_obj_find(scn, ITEM_PASS + seq, SCENEOBJT_TEXTLINE);
+	if (!tline)
+		return log_msg_ret("tln", -ENOENT);
+
+	*passp = abuf_data(&tline->buf);
+
+	return 0;
+}
+
+static int multiboot_ui_show_pass_msg(struct udevice *dev, int seq, bool show)
+{
+	struct bc_ui_priv *upriv = dev_get_uclass_priv(dev);
+	struct scene *scn = upriv->scn;
+
+	scene_obj_set_hide(scn, ITEM_PASS_MSG + seq, !show);
+
+	return 0;
+}
+
+static int multiboot_ui_set_pass_msg(struct udevice *dev, int seq,
+				     const char *msg)
+{
+	struct bc_ui_priv *upriv = dev_get_uclass_priv(dev);
+	struct expo *exp = upriv->expo;
+	struct abuf *buf;
+	int ret;
+
+	ret = expo_edit_str(exp, STR_PASS_MSG + seq, NULL, &buf);
+	if (ret)
+		return log_msg_ret("spm", ret);
+
+	abuf_set(buf, (void *)msg, strlen(msg) + 1);
+
+	return 0;
+}
+
 static struct bc_ui_ops ops = {
 	.print	= multiboot_ui_print,
 	.show	= multiboot_ui_show,
@@ -584,6 +664,10 @@ static struct bc_ui_ops ops = {
 	.render	= multiboot_ui_render,
 	.poll	= multiboot_ui_poll,
 	.switch_layout = multiboot_ui_switch_layout,
+	.show_pass = multiboot_ui_show_pass,
+	.get_pass = multiboot_ui_get_pass,
+	.show_pass_msg = multiboot_ui_show_pass_msg,
+	.set_pass_msg = multiboot_ui_set_pass_msg,
 };
 
 static const struct udevice_id multiboot_ui_ids[] = {

boot/bootctl/util.c

@@ -110,6 +110,66 @@ int bc_ui_switch_layout(struct udevice *dev)
 	return 0;
 }
 
+int bc_ui_show_pass(struct udevice *dev, int seq, bool show)
+{
+	struct bc_ui_ops *ops = bc_ui_get_ops(dev);
+	int ret;
+
+	if (!ops->show_pass)
+		return -ENOSYS;
+
+	ret = ops->show_pass(dev, seq, show);
+	if (ret)
+		return log_msg_ret("bsp", ret);
+
+	return 0;
+}
+
+int bc_ui_get_pass(struct udevice *dev, int seq, const char **passp)
+{
+	struct bc_ui_ops *ops = bc_ui_get_ops(dev);
+	int ret;
+
+	if (!ops->get_pass)
+		return -ENOSYS;
+
+	ret = ops->get_pass(dev, seq, passp);
+	if (ret)
+		return log_msg_ret("bgp", ret);
+
+	return 0;
+}
+
+int bc_ui_show_pass_msg(struct udevice *dev, int seq, bool show)
+{
+	struct bc_ui_ops *ops = bc_ui_get_ops(dev);
+	int ret;
+
+	if (!ops->show_pass_msg)
+		return -ENOSYS;
+
+	ret = ops->show_pass_msg(dev, seq, show);
+	if (ret)
+		return log_msg_ret("bse", ret);
+
+	return 0;
+}
+
+int bc_ui_set_pass_msg(struct udevice *dev, int seq, const char *msg)
+{
+	struct bc_ui_ops *ops = bc_ui_get_ops(dev);
+	int ret;
+
+	if (!ops->set_pass_msg)
+		return -ENOSYS;
+
+	ret = ops->set_pass_msg(dev, seq, msg);
+	if (ret)
+		return log_msg_ret("bsm", ret);
+
+	return 0;
+}
+
 void bc_oslist_setup_iter(struct oslist_iter *iter)
 {
 	memset(iter, '\0', sizeof(struct oslist_iter));