greybus: module id attributes

diff --git a/drivers/staging/greybus/core.c b/drivers/staging/greybus/core.c
index 68fb2a5..37ece6d 100644 (file)
--- a/drivers/staging/greybus/core.c
+++ b/drivers/staging/greybus/core.c
@@ -216,20 +216,81 @@ static umode_t function_attrs_are_visible(struct kobject *kobj,
        return 0;
 }
 
-static struct attribute_group function_addr_grp = {
+static struct attribute_group function_attr_grp = {
        .attrs =        function_attrs,
        .is_visible =   function_attrs_are_visible,
 };
 
-#if 0
-struct greybus_descriptor_module_id {
-       __le16  vendor;
-       __le16  product;
-       __le16  version;
-       __u8    vendor_stringid;
-       __u8    product_stringid;
+/* Module fields */
+#define greybus_module_attr(field)                                     \
+static ssize_t module_##field##_show(struct device *dev,               \
+                                    struct device_attribute *attr,     \
+                                    char *buf)                         \
+{                                                                      \
+       struct greybus_device *gdev = to_greybus_device(dev);           \
+       return sprintf(buf, "%x\n", gdev->module_id.field);             \
+}                                                                      \
+static DEVICE_ATTR_RO(module_##field)
+
+greybus_module_attr(vendor);
+greybus_module_attr(product);
+greybus_module_attr(version);
+
+static ssize_t module_vendor_string_show(struct device *dev,
+                                        struct device_attribute *attr,
+                                        char *buf)
+{
+       struct greybus_device *gdev = to_greybus_device(dev);
+       return sprintf(buf, "%s",
+                      greybus_string(gdev->module_id.vendor_stringid));
+}
+static DEVICE_ATTR_RO(module_vendor_string);
+
+static ssize_t module_product_string_show(struct device *dev,
+                                        struct device_attribute *attr,
+                                        char *buf)
+{
+       struct greybus_device *gdev = to_greybus_device(dev);
+       return sprintf(buf, "%s",
+                      greybus_string(gdev->module_id.product_stringid));
+}
+static DEVICE_ATTR_RO(module_product_string);
+
+static struct attribute *module_attrs[] = {
+       &dev_attr_module_vendor.attr,
+       &dev_attr_module_product.attr,
+       &dev_attr_module_version.attr,
+       &dev_attr_module_vendor_string.attr,
+       &dev_attr_module_product_string.attr,
+       NULL,
 };
-#endif
+
+static umode_t module_attrs_are_visible(struct kobject *kobj,
+                                       struct attribute *a, int n)
+{
+       struct greybus_device *gdev = to_greybus_device(kobj_to_dev(kobj));
+
+       if ((a == &dev_attr_module_vendor_string.attr) &&
+           (gdev->module_id.vendor_stringid))
+               return a->mode;
+       if ((a == &dev_attr_module_product_string.attr) &&
+           (gdev->module_id.product_stringid))
+               return a->mode;
+
+       // FIXME - make this a dynamic structure to "know" if it really is here
+       // or not easier?
+       if (gdev->module_id.vendor ||
+           gdev->module_id.product ||
+           gdev->module_id.version)
+               return a->mode;
+       return 0;
+}
+
+static struct attribute_group module_attr_grp = {
+       .attrs =        module_attrs,
+       .is_visible =   module_attrs_are_visible,
+};
+
 
 /* Serial Number */
 static ssize_t serial_number_show(struct device *dev,
@@ -246,15 +307,16 @@ static struct attribute *serial_number_attrs[] = {
        NULL,
 };
 
-static struct attribute_group serial_number_grp = {
+static struct attribute_group serial_number_attr_grp = {
        .attrs =        serial_number_attrs,
        .is_visible =   function_attrs_are_visible,
 };
 
 
 static const struct attribute_group *greybus_module_groups[] = {
-       &function_addr_grp,
-       &serial_number_grp,
+       &function_attr_grp,
+       &module_attr_grp,
+       &serial_number_attr_grp,
        NULL,
 };
 

diff --git a/drivers/staging/greybus/greybus.h b/drivers/staging/greybus/greybus.h
index 1a0dc4c..1955fea 100644 (file)
--- a/drivers/staging/greybus/greybus.h
+++ b/drivers/staging/greybus/greybus.h
@@ -178,6 +178,8 @@ struct greybus_device *greybus_new_device(struct device *parent,
                                          int size);
 void greybus_remove_device(struct greybus_device *gdev);
 
+const u8 *greybus_string(int id);
+
 /* Internal functions to gb module, move to internal .h file eventually. */
 
 int gb_new_ap_msg(u8 *data, int length);