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Commit 0b6a1e6f authored by Andrzej Pietrasiewicz's avatar Andrzej Pietrasiewicz Committed by Felipe Balbi
Browse files

usb: gadget: f_serial: add configfs support 



this patch implements the new configfs based interface
on f_serial function driver.

Signed-off-by: default avatarAndrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 9786b456

drivers/usb/gadget/f_serial.c

+55 −0
Original line number Diff line number Diff line
@@ -258,6 +258,59 @@ static int gser_bind(struct usb_configuration *c, struct usb_function *f) 
	return status;

}



static inline struct f_serial_opts *to_f_serial_opts(struct config_item *item)

{

	return container_of(to_config_group(item), struct f_serial_opts,

			    func_inst.group);

}



CONFIGFS_ATTR_STRUCT(f_serial_opts);

static ssize_t f_serial_attr_show(struct config_item *item,

				  struct configfs_attribute *attr,

				  char *page)

{

	struct f_serial_opts *opts = to_f_serial_opts(item);

	struct f_serial_opts_attribute *f_serial_opts_attr =

		container_of(attr, struct f_serial_opts_attribute, attr);

	ssize_t ret = 0;



	if (f_serial_opts_attr->show)

		ret = f_serial_opts_attr->show(opts, page);



	return ret;

}



static void serial_attr_release(struct config_item *item)

{

	struct f_serial_opts *opts = to_f_serial_opts(item);



	usb_put_function_instance(&opts->func_inst);

}



static struct configfs_item_operations serial_item_ops = {

	.release	= serial_attr_release,

	.show_attribute = f_serial_attr_show,

};



static ssize_t f_serial_port_num_show(struct f_serial_opts *opts, char *page)

{

	return sprintf(page, "%u\n", opts->port_num);

}



static struct f_serial_opts_attribute f_serial_port_num =

	__CONFIGFS_ATTR_RO(port_num, f_serial_port_num_show);



static struct configfs_attribute *acm_attrs[] = {

	&f_serial_port_num.attr,

	NULL,

};



static struct config_item_type serial_func_type = {

	.ct_item_ops	= &serial_item_ops,

	.ct_attrs	= acm_attrs,

	.ct_owner	= THIS_MODULE,

};



static void gser_free_inst(struct usb_function_instance *f)

{

	struct f_serial_opts *opts;
@@ -282,6 +335,8 @@ static struct usb_function_instance *gser_alloc_inst(void) 
		kfree(opts);

		return ERR_PTR(ret);

	}

	config_group_init_type_name(&opts->func_inst.group, "",

				    &serial_func_type);



	return &opts->func_inst;

}