Having specialized functions for each attribute may be
sometime inconvenient to use. Provide also function
whihc allows to set attribute selected by parameter.
Signed-off-by: Krzysztof Opasiak <k.opasiak@xxxxxxxxxxx>
---
include/usbg/usbg.h | 53 +++++++++++++++++++++++++++++++++++++
src/usbg.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 126 insertions(+)
diff --git a/include/usbg/usbg.h b/include/usbg/usbg.h
index 3f5d561..2c191eb 100644
--- a/include/usbg/usbg.h
+++ b/include/usbg/usbg.h
@@ -88,6 +88,22 @@ typedef struct usbg_function usbg_function;
typedef struct usbg_binding usbg_binding;
/**
+ * @typedef usbg_gadget_attr
+ * @brief Gadget attributes which can be set using
+ * usbg_set_gadget_attr() function.
+ */
+typedef enum {
+ BCD_USB = 0,
+ B_DEVICE_CLASS,
+ B_DEVICE_SUB_CLASS,
+ B_DEVICE_PROTOCOL,
+ B_MAX_PACKET_SIZE_0,
+ ID_VENDOR,
+ ID_PRODUCT,
+ BCD_DEVICE,
+} usbg_gadget_attr;
+
+/**
* @typedef usbg_gadget_attrs
* @brief USB gadget device attributes
*/
@@ -395,6 +411,43 @@ extern int usbg_create_gadget(usbg_state *s, const char *name,
usbg_gadget **g);
/**
+ * @brief Get string representing selected gadget attribute
+ * @param attr code of selected attrobute
+ * @return String suitable for given attribute or NULL if such
+ * string has not been found
+ */
+extern const char *usbg_get_gadget_attr_str(usbg_gadget_attr attr);
+
+/**
+ * @brief Lookup attr code based on its name
+ * @param name of attribute
+ * @return code of suitable attribute or usbg_error
+ */
+int usbg_lookup_gadget_attr(const char *name);
+
+/**
+ * @brief Set selected attribute to value
+ * @param g Pointer to gadget
+ * @param attr Code of selected attribute
+ * @param val value to be set
+ * @return 0 on success, usbg_error otherwise
+ * @note val is of type int but value provided to this function should
+ * be suitable to place it in type dedicated for selected attr (uint16 or uint8)
+ */
+extern int usbg_set_gadget_attr(usbg_gadget *g, usbg_gadget_attr attr, int val);
+
+/**
+ * @brief Get value of selected attribute
+ * @param g Pointer to gadget
+ * @param attr Code of selected attribute
+ * @return Value of selected attribute (always above zero) or
+ * usbg_error if error occurred.
+ * @note User should use only lowest one or two bytes as attribute value
+ * depending on attribute size (see usbg_gadget_attrs for details).
+ */
+extern int usbg_get_gadget_attr(usbg_gadget *g, usbg_gadget_attr attr);
+
+/**
* @brief Set the USB gadget attributes
* @param g Pointer to gadget
* @param g_attrs Gadget attributes
diff --git a/src/usbg.c b/src/usbg.c
index bd63790..cd2179e 100644
--- a/src/usbg.c
+++ b/src/usbg.c
@@ -111,6 +111,18 @@ const char *function_names[] =
"ffs",
};
+const char *gadget_attr_names[] =
+{
+ "bcdUSB",
+ "bDeviceClass",
+ "bDeviceSubClass",
+ "bDeviceProtocol",
+ "bMaxPacketSize0",
+ "idVendor",
+ "idProduct",
+ "bcdDevice"
+};
+
#define ERROR(msg, ...) do {\
fprintf(stderr, "%s() "msg" \n", \
__func__, ##__VA_ARGS__);\
@@ -158,6 +170,7 @@ static int usbg_translate_error(int error)
case ENOTDIR:
ret = USBG_ERROR_NOT_FOUND;
break;
+ case ERANGE:
case EINVAL:
case USBG_ERROR_INVALID_PARAM:
ret = USBG_ERROR_INVALID_PARAM;
@@ -323,6 +336,29 @@ const const char *usbg_get_function_type_str(usbg_function_type type)
function_names[type] : NULL;
}
+int usbg_lookup_gadget_attr(const char *name)
+{
+ int i = 0;
+ int max = sizeof(gadget_attr_names)/sizeof(char *);
+
+ if (!name)
+ return USBG_ERROR_INVALID_PARAM;
+
+ do {
+ if (!strcmp(name, gadget_attr_names[i]))
+ return i;
+ i++;
+ } while (i != max);
+
+ return USBG_ERROR_NOT_FOUND;
+}
+
+const const char *usbg_get_gadget_attr_str(usbg_gadget_attr attr)
+{
+ return attr >= 0 && attr < sizeof(gadget_attr_names)/sizeof(char *) ?
+ gadget_attr_names[attr] : NULL;
+}
+
static usbg_error usbg_split_function_instance_type(const char *full_name,
usbg_function_type *f_type, const char **instance)
{
@@ -519,6 +555,7 @@ static int usbg_write_int(const char *path, const char *name, const char *file,
}
#define usbg_write_dec(p, n, f, v) usbg_write_int(p, n, f, v, "%d\n")
+#define usbg_write_hex(p, n, f, v) usbg_write_int(p, n, f, v, "0x%x\n")
#define usbg_write_hex16(p, n, f, v) usbg_write_int(p, n, f, v, "0x%04x\n")
#define usbg_write_hex8(p, n, f, v) usbg_write_int(p, n, f, v, "0x%02x\n")
@@ -1746,6 +1783,42 @@ int usbg_get_gadget_udc(usbg_gadget *g, char *buf, size_t len)
return USBG_SUCCESS;
}
+int usbg_set_gadget_attr(usbg_gadget *g, usbg_gadget_attr attr, int val)
+{
+ const char *attr_name;
+ int ret = USBG_ERROR_INVALID_PARAM;
+
+ if (!g)
+ goto out;
+
+ attr_name = usbg_get_gadget_attr_str(attr);
+ if (!attr_name)
+ goto out;
+
+ ret = usbg_write_hex(g->path, g->name, attr_name, val);
+
+out:
+ return ret;
+}
+
+int usbg_get_gadget_attr(usbg_gadget *g, usbg_gadget_attr attr)
+{
+ const char *attr_name;
+ int ret = USBG_ERROR_INVALID_PARAM;
+
+ if (!g)
+ goto out;
+
+ attr_name = usbg_get_gadget_attr_str(attr);
+ if (!attr_name)
+ goto out;
+
+ usbg_read_hex(g->path, g->name, attr_name, &ret);
+
+out:
+ return ret;
+}
+
int usbg_set_gadget_attrs(usbg_gadget *g, usbg_gadget_attrs *g_attrs)
{
int ret;
--
1.7.9.5
--
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