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Subject[PATCH v2 3/6] usb: gadget: aspeed: allow to set usb strings in device tree
Date
From: Tao Ren <rentao.bupt@gmail.com>

If "vhub,string-descriptor" device tree property is defined, the driver
will load string descriptors from device tree; otherwise, the default
string descriptors will be used.

Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
---
No change in v2:
- the patch is added into the series since v2.

drivers/usb/gadget/udc/aspeed-vhub/hub.c | 58 +++++++++++++++++++++++-
1 file changed, 57 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/aspeed-vhub/hub.c b/drivers/usb/gadget/udc/aspeed-vhub/hub.c
index 35edf37553f0..421631d86a17 100644
--- a/drivers/usb/gadget/udc/aspeed-vhub/hub.c
+++ b/drivers/usb/gadget/udc/aspeed-vhub/hub.c
@@ -941,9 +941,61 @@ static int ast_vhub_str_alloc_add(struct ast_vhub *vhub,
return 0;
}

+static const struct {
+ const char *name;
+ u8 id;
+} str_id_map[] = {
+ {"manufacturer", AST_VHUB_STR_MANUF},
+ {"product", AST_VHUB_STR_PRODUCT},
+ {"serial-number", AST_VHUB_STR_SERIAL},
+ {},
+};
+
+static int ast_vhub_of_parse_str_desc(struct ast_vhub *vhub,
+ const struct device_node *desc_np)
+{
+ u32 langid;
+ int ret = 0;
+ int i, offset;
+ const char *str;
+ struct device_node *child;
+ struct usb_string str_array[AST_VHUB_STR_INDEX_MAX];
+ struct usb_gadget_strings lang_str = {
+ .strings = (struct usb_string *)str_array,
+ };
+
+ for_each_child_of_node(desc_np, child) {
+ if (of_property_read_u32(child, "reg", &langid))
+ continue; /* no language identifier specified */
+
+ if (!usb_validate_langid(langid))
+ continue; /* invalid language identifier */
+
+ lang_str.language = langid;
+ for (i = offset = 0; str_id_map[i].name; i++) {
+ str = of_get_property(child, str_id_map[i].name, NULL);
+ if (str) {
+ str_array[offset].s = str;
+ str_array[offset].id = str_id_map[i].id;
+ offset++;
+ }
+ }
+ str_array[offset].id = 0;
+ str_array[offset].s = NULL;
+
+ ret = ast_vhub_str_alloc_add(vhub, &lang_str);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
static int ast_vhub_init_desc(struct ast_vhub *vhub)
{
int ret;
+ struct device_node *desc_np;
+ const struct device_node *vhub_np = vhub->pdev->dev.of_node;

/* Initialize vhub Device Descriptor. */
memcpy(&vhub->vhub_dev_desc, &ast_vhub_dev_desc,
@@ -960,7 +1012,11 @@ static int ast_vhub_init_desc(struct ast_vhub *vhub)

/* Initialize vhub String Descriptors. */
INIT_LIST_HEAD(&vhub->vhub_str_desc);
- ret = ast_vhub_str_alloc_add(vhub, &ast_vhub_strings);
+ desc_np = of_get_child_by_name(vhub_np, "vhub-strings");
+ if (desc_np)
+ ret = ast_vhub_of_parse_str_desc(vhub, desc_np);
+ else
+ ret = ast_vhub_str_alloc_add(vhub, &ast_vhub_strings);

return ret;
}
--
2.17.1
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