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authorAndrzej Pietrasiewicz <andrzej.p@samsung.com>2014-07-09 14:20:07 +0400
committerFelipe Balbi <balbi@ti.com>2014-07-10 17:36:51 +0400
commit7ea4f088c810dab3ba3ab4c7a3879238f790e1fd (patch)
tree309115f9dca2438ced735a67957ca97d397acef4 /drivers/usb
parentf96cbd149aff4b0c4f23629051ed5d28b6804fb1 (diff)
downloadlinux-7ea4f088c810dab3ba3ab4c7a3879238f790e1fd.tar.xz
usb: gadget: u_os_desc: helper functions for accessing ext prop buffer
Provide helper functions to get pointers to particular locations within a buffer holding an extended properties descriptor. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/gadget/u_os_desc.h59
1 files changed, 46 insertions, 13 deletions
diff --git a/drivers/usb/gadget/u_os_desc.h b/drivers/usb/gadget/u_os_desc.h
index ea5cf8c2da28..947b7ddff691 100644
--- a/drivers/usb/gadget/u_os_desc.h
+++ b/drivers/usb/gadget/u_os_desc.h
@@ -35,27 +35,63 @@
#define USB_EXT_PROP_UNICODE_LINK 6
#define USB_EXT_PROP_UNICODE_MULTI 7
+static inline u8 *__usb_ext_prop_ptr(u8 *buf, size_t offset)
+{
+ return buf + offset;
+}
+
+static inline u8 *usb_ext_prop_size_ptr(u8 *buf)
+{
+ return __usb_ext_prop_ptr(buf, USB_EXT_PROP_DW_SIZE);
+}
+
+static inline u8 *usb_ext_prop_type_ptr(u8 *buf)
+{
+ return __usb_ext_prop_ptr(buf, USB_EXT_PROP_DW_PROPERTY_DATA_TYPE);
+}
+
+static inline u8 *usb_ext_prop_name_len_ptr(u8 *buf)
+{
+ return __usb_ext_prop_ptr(buf, USB_EXT_PROP_W_PROPERTY_NAME_LENGTH);
+}
+
+static inline u8 *usb_ext_prop_name_ptr(u8 *buf)
+{
+ return __usb_ext_prop_ptr(buf, USB_EXT_PROP_B_PROPERTY_NAME);
+}
+
+static inline u8 *usb_ext_prop_data_len_ptr(u8 *buf, size_t off)
+{
+ return __usb_ext_prop_ptr(buf,
+ USB_EXT_PROP_DW_PROPERTY_DATA_LENGTH + off);
+}
+
+static inline u8 *usb_ext_prop_data_ptr(u8 *buf, size_t off)
+{
+ return __usb_ext_prop_ptr(buf, USB_EXT_PROP_B_PROPERTY_DATA + off);
+}
+
static inline void usb_ext_prop_put_size(u8 *buf, int dw_size)
{
- put_unaligned_le32(dw_size, &buf[USB_EXT_PROP_DW_SIZE]);
+ put_unaligned_le32(dw_size, usb_ext_prop_size_ptr(buf));
}
static inline void usb_ext_prop_put_type(u8 *buf, int type)
{
- put_unaligned_le32(type, &buf[USB_EXT_PROP_DW_PROPERTY_DATA_TYPE]);
+ put_unaligned_le32(type, usb_ext_prop_type_ptr(buf));
}
static inline int usb_ext_prop_put_name(u8 *buf, const char *name, int pnl)
{
int result;
- put_unaligned_le16(pnl, &buf[USB_EXT_PROP_W_PROPERTY_NAME_LENGTH]);
+ put_unaligned_le16(pnl, usb_ext_prop_name_len_ptr(buf));
result = utf8s_to_utf16s(name, strlen(name), UTF16_LITTLE_ENDIAN,
- (wchar_t *) &buf[USB_EXT_PROP_B_PROPERTY_NAME], pnl - 2);
+ (wchar_t *) usb_ext_prop_name_ptr(buf), pnl - 2);
if (result < 0)
return result;
- put_unaligned_le16(0, &buf[USB_EXT_PROP_B_PROPERTY_NAME + pnl]);
+ put_unaligned_le16(0, &buf[USB_EXT_PROP_B_PROPERTY_NAME + pnl - 2]);
return pnl;
}
@@ -63,26 +99,23 @@ static inline int usb_ext_prop_put_name(u8 *buf, const char *name, int pnl)
static inline void usb_ext_prop_put_binary(u8 *buf, int pnl, const u8 *data,
int data_len)
{
- put_unaligned_le32(data_len,
- &buf[USB_EXT_PROP_DW_PROPERTY_DATA_LENGTH + pnl]);
- memcpy(&buf[USB_EXT_PROP_B_PROPERTY_DATA + pnl], data, data_len);
+ put_unaligned_le32(data_len, usb_ext_prop_data_len_ptr(buf, pnl));
+ memcpy(usb_ext_prop_data_ptr(buf, pnl), data, data_len);
}
static inline int usb_ext_prop_put_unicode(u8 *buf, int pnl, const char *string,
int data_len)
{
int result;
- put_unaligned_le32(data_len,
- &buf[USB_EXT_PROP_DW_PROPERTY_DATA_LENGTH + pnl]);
-
+ put_unaligned_le32(data_len, usb_ext_prop_data_len_ptr(buf, pnl));
result = utf8s_to_utf16s(string, data_len >> 1, UTF16_LITTLE_ENDIAN,
- (wchar_t *) &buf[USB_EXT_PROP_B_PROPERTY_DATA + pnl],
+ (wchar_t *) usb_ext_prop_data_ptr(buf, pnl),
data_len - 2);
if (result < 0)
return result;
put_unaligned_le16(0,
- &buf[USB_EXT_PROP_B_PROPERTY_DATA + pnl + data_len]);
+ &buf[USB_EXT_PROP_B_PROPERTY_DATA + pnl + data_len - 2]);
return data_len;
}