1 // SPDX-License-Identifier: GPL-2.0+
3  * f_serial.c - generic USB serial function driver
24  * if you can arrange appropriate host side drivers.
38 /*-------------------------------------------------------------------------*/
135 	.language =		0x0409,	/* en-us */
144 /*-------------------------------------------------------------------------*/
149 	struct usb_composite_dev *cdev = f->config->cdev;  in gser_set_alt()
153 	if (gser->port.in->enabled) {  in gser_set_alt()
154 		dev_dbg(&cdev->gadget->dev,  in gser_set_alt()
155 			"reset generic ttyGS%d\n", gser->port_num);  in gser_set_alt()
156 		gserial_disconnect(&gser->port);  in gser_set_alt()
158 	if (!gser->port.in->desc || !gser->port.out->desc) {  in gser_set_alt()
159 		dev_dbg(&cdev->gadget->dev,  in gser_set_alt()
160 			"activate generic ttyGS%d\n", gser->port_num);  in gser_set_alt()
161 		if (config_ep_by_speed(cdev->gadget, f, gser->port.in) ||  in gser_set_alt()
162 		    config_ep_by_speed(cdev->gadget, f, gser->port.out)) {  in gser_set_alt()
163 			gser->port.in->desc = NULL;  in gser_set_alt()
164 			gser->port.out->desc = NULL;  in gser_set_alt()
165 			return -EINVAL;  in gser_set_alt()
168 	gserial_connect(&gser->port, gser->port_num);  in gser_set_alt()
175 	struct usb_composite_dev *cdev = f->config->cdev;  in gser_disable()
177 	dev_dbg(&cdev->gadget->dev,  in gser_disable()
178 		"generic ttyGS%d deactivated\n", gser->port_num);  in gser_disable()
179 	gserial_disconnect(&gser->port);  in gser_disable()
182 /*-------------------------------------------------------------------------*/
188 	struct usb_composite_dev *cdev = c->cdev;  in gser_bind()
191 	struct usb_ep		*ep;  in gser_bind()  local
193 	/* REVISIT might want instance-specific strings to help  in gser_bind()
197 	/* maybe allocate device-global string ID */  in gser_bind()
199 		status = usb_string_id(c->cdev);  in gser_bind()
205 	/* allocate instance-specific interface IDs */  in gser_bind()
209 	gser->data_id = status;  in gser_bind()
212 	status = -ENODEV;  in gser_bind()
214 	/* allocate instance-specific endpoints */  in gser_bind()
215 	ep = usb_ep_autoconfig(cdev->gadget, &gser_fs_in_desc);  in gser_bind()
216 	if (!ep)  in gser_bind()
218 	gser->port.in = ep;  in gser_bind()
220 	ep = usb_ep_autoconfig(cdev->gadget, &gser_fs_out_desc);  in gser_bind()
221 	if (!ep)  in gser_bind()
223 	gser->port.out = ep;  in gser_bind()
226 	 * hardware is dual speed, all bulk-capable endpoints work at  in gser_bind()
239 	dev_dbg(&cdev->gadget->dev, "generic ttyGS%d: IN/%s OUT/%s\n",  in gser_bind()
240 		gser->port_num,  in gser_bind()
241 		gser->port.in->name, gser->port.out->name);  in gser_bind()
245 	ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);  in gser_bind()
260 	usb_put_function_instance(&opts->func_inst);  in serial_attr_release()
272 	return gserial_set_console(to_f_serial_opts(item)->port_num,  in f_serial_console_store()
278 	return gserial_get_console(to_f_serial_opts(item)->port_num, page);  in f_serial_console_show()
287 	return sprintf(page, "%u\n", to_f_serial_opts(item)->port_num);  in f_serial_port_num_show()
311 	gserial_free_line(opts->port_num);  in gser_free_inst()
322 		return ERR_PTR(-ENOMEM);  in gser_alloc_inst()
324 	opts->func_inst.free_func_inst = gser_free_inst;  in gser_alloc_inst()
325 	ret = gserial_alloc_line(&opts->port_num);  in gser_alloc_inst()
330 	config_group_init_type_name(&opts->func_inst.group, "",  in gser_alloc_inst()
333 	return &opts->func_inst;  in gser_alloc_inst()
349 	gserial_disconnect(&gser->port);  in gser_unbind()
357 	gserial_resume(&gser->port);  in gser_resume()
364 	gserial_suspend(&gser->port);  in gser_suspend()
369 	return (f->func_wakeup_armed ? USB_INTRF_STAT_FUNC_RW : 0) |  in gser_get_status()
381 		return ERR_PTR(-ENOMEM);  in gser_alloc()
385 	gser->port_num = opts->port_num;  in gser_alloc()
387 	gser->port.func.name = "gser";  in gser_alloc()
388 	gser->port.func.strings = gser_strings;  in gser_alloc()
389 	gser->port.func.bind = gser_bind;  in gser_alloc()
390 	gser->port.func.unbind = gser_unbind;  in gser_alloc()
391 	gser->port.func.set_alt = gser_set_alt;  in gser_alloc()
392 	gser->port.func.disable = gser_disable;  in gser_alloc()
393 	gser->port.func.free_func = gser_free;  in gser_alloc()
394 	gser->port.func.resume = gser_resume;  in gser_alloc()
395 	gser->port.func.suspend = gser_suspend;  in gser_alloc()
396 	gser->port.func.get_status = gser_get_status;  in gser_alloc()
398 	return &gser->port.func;  in gser_alloc()