1 // SPDX-License-Identifier: GPL-2.0+
3  * g_ffs.c -- user mode file system API for USB composite function controllers
108 		.language	= 0x0409,	/* en-us */
109 		.strings	= gfs_strings,
117 	int num;  member
151 	.strings	= gfs_dev_strings,
193 		ret = -ENOMEM;  in gfs_init()
201 		ret = -ENOMEM;  in gfs_init()
209 			--i;  in gfs_init()
214 			ret = ffs_single_dev(opts->dev);  in gfs_init()
216 			ret = ffs_name_dev(opts->dev, func_names[i]);  in gfs_init()
219 		opts->dev->ffs_ready_callback = functionfs_ready_callback;  in gfs_init()
220 		opts->dev->ffs_closed_callback = functionfs_closed_callback;  in gfs_init()
221 		opts->dev->ffs_acquire_dev_callback = functionfs_acquire_dev;  in gfs_init()
222 		opts->dev->ffs_release_dev_callback = functionfs_release_dev;  in gfs_init()
223 		opts->no_configfs = true;  in gfs_init()
231 		usb_put_function_instance(fi_ffs[i--]);  in gfs_init()
259 		return ERR_PTR(-ENOENT);  in functionfs_acquire_dev()
276 	if (--missing_funcs)  in functionfs_ready_callback()
280 		return -EBUSY;  in functionfs_ready_callback()
316 		return -ENODEV;  in gfs_bind()
318 	if (can_support_ecm(cdev->gadget)) {  in gfs_bind()
325 		net = ecm_opts->net;  in gfs_bind()
334 		net = geth_opts->net;  in gfs_bind()
347 				   func_inst)->net;  in gfs_bind()
361 	gether_set_gadget(net, cdev->gadget);  in gfs_bind()
366 	if (can_support_ecm(cdev->gadget)) {  in gfs_bind()
370 		ecm_opts->bound = true;  in gfs_bind()
376 		geth_opts->bound = true;  in gfs_bind()
388 	if (gadget_is_otg(cdev->gadget) && !gfs_otg_desc[0]) {  in gfs_bind()
391 		usb_desc = usb_otg_descriptor_alloc(cdev->gadget);  in gfs_bind()
393 			ret = -ENOMEM;  in gfs_bind()
396 		usb_otg_descriptor_init(cdev->gadget, usb_desc);  in gfs_bind()
405 		c->c.label			= gfs_strings[sid].s;  in gfs_bind()
406 		c->c.iConfiguration		= gfs_strings[sid].id;  in gfs_bind()
407 		c->c.bConfigurationValue	= 1 + i;  in gfs_bind()
408 		c->c.bmAttributes		= USB_CONFIG_ATT_SELFPOWER;  in gfs_bind()
410 		c->num = i;  in gfs_bind()
412 		ret = usb_add_config(cdev, &c->c, gfs_do_config);  in gfs_bind()
429 	if (can_support_ecm(cdev->gadget))  in gfs_bind()
450 	if (can_support_ecm(cdev->gadget)) {  in gfs_unbind()
479 		return -ENODEV;  in gfs_do_config()
481 	if (gadget_is_otg(c->cdev->gadget)) {  in gfs_do_config()
482 		c->descriptors = gfs_otg_desc;  in gfs_do_config()
483 		c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;  in gfs_do_config()
486 	if (gc->eth) {  in gfs_do_config()
487 		ret = gc->eth(c);  in gfs_do_config()
493 		f_ffs[gc->num][i] = usb_get_function(fi_ffs[i]);  in gfs_do_config()
494 		if (IS_ERR(f_ffs[gc->num][i])) {  in gfs_do_config()
495 			ret = PTR_ERR(f_ffs[gc->num][i]);  in gfs_do_config()
498 		ret = usb_add_function(c, f_ffs[gc->num][i]);  in gfs_do_config()
500 			usb_put_function(f_ffs[gc->num][i]);  in gfs_do_config()
507 	 * pointers in c->interface array.  This happens every time  in gfs_do_config()
513 	 * c->interface array.  We need to make sure this is true.  in gfs_do_config()
515 	if (c->next_interface_id < ARRAY_SIZE(c->interface))  in gfs_do_config()
516 		c->interface[c->next_interface_id] = NULL;  in gfs_do_config()
520 	while (--i >= 0) {  in gfs_do_config()
521 		if (!IS_ERR(f_ffs[gc->num][i]))  in gfs_do_config()
522 			usb_remove_function(c, f_ffs[gc->num][i]);  in gfs_do_config()
523 		usb_put_function(f_ffs[gc->num][i]);  in gfs_do_config()
534 	if (can_support_ecm(c->cdev->gadget)) {  in eth_bind_config()