[mirror_ubuntu-bionic-kernel.git] / drivers / usb / gadget / function / f_serial.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * f_serial.c - generic USB serial function driver
 *
 * Copyright (C) 2003 Al Borchers (alborchers@steinerpoint.com)
 * Copyright (C) 2008 by David Brownell
 * Copyright (C) 2008 by Nokia Corporation
 */

#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>

#include "u_serial.h"


/*
 * This function packages a simple "generic serial" port with no real
 * control mechanisms, just raw data transfer over two bulk endpoints.
 *
 * Because it's not standardized, this isn't as interoperable as the
 * CDC ACM driver.  However, for many purposes it's just as functional
 * if you can arrange appropriate host side drivers.
 */

struct f_gser {
	struct gserial			port;
	u8				data_id;
	u8				port_num;
};

static inline struct f_gser *func_to_gser(struct usb_function *f)
{
	return container_of(f, struct f_gser, port.func);
}

/*-------------------------------------------------------------------------*/

/* interface descriptor: */

static struct usb_interface_descriptor gser_interface_desc = {
	.bLength =		USB_DT_INTERFACE_SIZE,
	.bDescriptorType =	USB_DT_INTERFACE,
	/* .bInterfaceNumber = DYNAMIC */
	.bNumEndpoints =	2,
	.bInterfaceClass =	USB_CLASS_VENDOR_SPEC,
	.bInterfaceSubClass =	0,
	.bInterfaceProtocol =	0,
	/* .iInterface = DYNAMIC */
};

/* full speed support: */

static struct usb_endpoint_descriptor gser_fs_in_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,
	.bEndpointAddress =	USB_DIR_IN,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
};

static struct usb_endpoint_descriptor gser_fs_out_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,
	.bEndpointAddress =	USB_DIR_OUT,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
};

static struct usb_descriptor_header *gser_fs_function[] = {
	(struct usb_descriptor_header *) &gser_interface_desc,
	(struct usb_descriptor_header *) &gser_fs_in_desc,
	(struct usb_descriptor_header *) &gser_fs_out_desc,
	NULL,
};

/* high speed support: */

static struct usb_endpoint_descriptor gser_hs_in_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
	.wMaxPacketSize =	cpu_to_le16(512),
};

static struct usb_endpoint_descriptor gser_hs_out_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
	.wMaxPacketSize =	cpu_to_le16(512),
};

static struct usb_descriptor_header *gser_hs_function[] = {
	(struct usb_descriptor_header *) &gser_interface_desc,
	(struct usb_descriptor_header *) &gser_hs_in_desc,
	(struct usb_descriptor_header *) &gser_hs_out_desc,
	NULL,
};

static struct usb_endpoint_descriptor gser_ss_in_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
	.wMaxPacketSize =	cpu_to_le16(1024),
};

static struct usb_endpoint_descriptor gser_ss_out_desc = {
	.bLength =		USB_DT_ENDPOINT_SIZE,
	.bDescriptorType =	USB_DT_ENDPOINT,
	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
	.wMaxPacketSize =	cpu_to_le16(1024),
};

static struct usb_ss_ep_comp_descriptor gser_ss_bulk_comp_desc = {
	.bLength =              sizeof gser_ss_bulk_comp_desc,
	.bDescriptorType =      USB_DT_SS_ENDPOINT_COMP,
};

static struct usb_descriptor_header *gser_ss_function[] = {
	(struct usb_descriptor_header *) &gser_interface_desc,
	(struct usb_descriptor_header *) &gser_ss_in_desc,
	(struct usb_descriptor_header *) &gser_ss_bulk_comp_desc,
	(struct usb_descriptor_header *) &gser_ss_out_desc,
	(struct usb_descriptor_header *) &gser_ss_bulk_comp_desc,
	NULL,
};

/* string descriptors: */

static struct usb_string gser_string_defs[] = {
	[0].s = "Generic Serial",
	{  } /* end of list */
};

static struct usb_gadget_strings gser_string_table = {
	.language =		0x0409,	/* en-us */
	.strings =		gser_string_defs,
};

static struct usb_gadget_strings *gser_strings[] = {
	&gser_string_table,
	NULL,
};

/*-------------------------------------------------------------------------*/

static int gser_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
{
	struct f_gser		*gser = func_to_gser(f);
	struct usb_composite_dev *cdev = f->config->cdev;

	/* we know alt == 0, so this is an activation or a reset */

	if (gser->port.in->enabled) {
		dev_dbg(&cdev->gadget->dev,
			"reset generic ttyGS%d\n", gser->port_num);
		gserial_disconnect(&gser->port);
	}
	if (!gser->port.in->desc || !gser->port.out->desc) {
		dev_dbg(&cdev->gadget->dev,
			"activate generic ttyGS%d\n", gser->port_num);
		if (config_ep_by_speed(cdev->gadget, f, gser->port.in) ||
		    config_ep_by_speed(cdev->gadget, f, gser->port.out)) {
			gser->port.in->desc = NULL;
			gser->port.out->desc = NULL;
			return -EINVAL;
		}
	}
	gserial_connect(&gser->port, gser->port_num);
	return 0;
}

static void gser_disable(struct usb_function *f)
{
	struct f_gser	*gser = func_to_gser(f);
	struct usb_composite_dev *cdev = f->config->cdev;

	dev_dbg(&cdev->gadget->dev,
		"generic ttyGS%d deactivated\n", gser->port_num);
	gserial_disconnect(&gser->port);
}

/*-------------------------------------------------------------------------*/

/* serial function driver setup/binding */

static int gser_bind(struct usb_configuration *c, struct usb_function *f)
{
	struct usb_composite_dev *cdev = c->cdev;
	struct f_gser		*gser = func_to_gser(f);
	int			status;
	struct usb_ep		*ep;

	/* REVISIT might want instance-specific strings to help
	 * distinguish instances ...
	 */

	/* maybe allocate device-global string ID */
	if (gser_string_defs[0].id == 0) {
		status = usb_string_id(c->cdev);
		if (status < 0)
			return status;
		gser_string_defs[0].id = status;
	}

	/* allocate instance-specific interface IDs */
	status = usb_interface_id(c, f);
	if (status < 0)
		goto fail;
	gser->data_id = status;
	gser_interface_desc.bInterfaceNumber = status;

	status = -ENODEV;

	/* allocate instance-specific endpoints */
	ep = usb_ep_autoconfig(cdev->gadget, &gser_fs_in_desc);
	if (!ep)
		goto fail;
	gser->port.in = ep;

	ep = usb_ep_autoconfig(cdev->gadget, &gser_fs_out_desc);
	if (!ep)
		goto fail;
	gser->port.out = ep;

	/* support all relevant hardware speeds... we expect that when
	 * hardware is dual speed, all bulk-capable endpoints work at
	 * both speeds
	 */
	gser_hs_in_desc.bEndpointAddress = gser_fs_in_desc.bEndpointAddress;
	gser_hs_out_desc.bEndpointAddress = gser_fs_out_desc.bEndpointAddress;

	gser_ss_in_desc.bEndpointAddress = gser_fs_in_desc.bEndpointAddress;
	gser_ss_out_desc.bEndpointAddress = gser_fs_out_desc.bEndpointAddress;

	status = usb_assign_descriptors(f, gser_fs_function, gser_hs_function,
			gser_ss_function, NULL);
	if (status)
		goto fail;
	dev_dbg(&cdev->gadget->dev, "generic ttyGS%d: %s speed IN/%s OUT/%s\n",
		gser->port_num,
		gadget_is_superspeed(c->cdev->gadget) ? "super" :
		gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
		gser->port.in->name, gser->port.out->name);
	return 0;

fail:
	ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);

	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);
}

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,
};

static ssize_t f_serial_port_num_show(struct config_item *item, char *page)
{
	return sprintf(page, "%u\n", to_f_serial_opts(item)->port_num);
}

CONFIGFS_ATTR_RO(f_serial_, port_num);

static struct configfs_attribute *acm_attrs[] = {
	&f_serial_attr_port_num,
	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;

	opts = container_of(f, struct f_serial_opts, func_inst);
	gserial_free_line(opts->port_num);
	kfree(opts);
}

static struct usb_function_instance *gser_alloc_inst(void)
{
	struct f_serial_opts *opts;
	int ret;

	opts = kzalloc(sizeof(*opts), GFP_KERNEL);
	if (!opts)
		return ERR_PTR(-ENOMEM);

	opts->func_inst.free_func_inst = gser_free_inst;
	ret = gserial_alloc_line(&opts->port_num);
	if (ret) {
		kfree(opts);
		return ERR_PTR(ret);
	}
	config_group_init_type_name(&opts->func_inst.group, "",
				    &serial_func_type);

	return &opts->func_inst;
}

static void gser_free(struct usb_function *f)
{
	struct f_gser *serial;

	serial = func_to_gser(f);
	kfree(serial);
}

static void gser_unbind(struct usb_configuration *c, struct usb_function *f)
{
	usb_free_all_descriptors(f);
}

static struct usb_function *gser_alloc(struct usb_function_instance *fi)
{
	struct f_gser	*gser;
	struct f_serial_opts *opts;

	/* allocate and initialize one new instance */
	gser = kzalloc(sizeof(*gser), GFP_KERNEL);
	if (!gser)
		return ERR_PTR(-ENOMEM);

	opts = container_of(fi, struct f_serial_opts, func_inst);

	gser->port_num = opts->port_num;

	gser->port.func.name = "gser";
	gser->port.func.strings = gser_strings;
	gser->port.func.bind = gser_bind;
	gser->port.func.unbind = gser_unbind;
	gser->port.func.set_alt = gser_set_alt;
	gser->port.func.disable = gser_disable;
	gser->port.func.free_func = gser_free;

	return &gser->port.func;
}

DECLARE_USB_FUNCTION_INIT(gser, gser_alloc_inst, gser_alloc);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Al Borchers");
MODULE_AUTHOR("David Brownell");
Commit	Line	Data
5fd54ace	1	// SPDX-License-Identifier: GPL-2.0+
61d8baea DB	2	/*
	3	* f_serial.c - generic USB serial function driver
	4	*
	5	* Copyright (C) 2003 Al Borchers (alborchers@steinerpoint.com)
	6	* Copyright (C) 2008 by David Brownell
	7	* Copyright (C) 2008 by Nokia Corporation
61d8baea DB	8	*/
61d8baea DB	9
5a0e3ad6	10	#include <linux/slab.h>
61d8baea	11	#include <linux/kernel.h>
60540ea2	12	#include <linux/module.h>
61d8baea DB	13	#include <linux/device.h>
	14
	15	#include "u_serial.h"
61d8baea DB	16
	17
	18	/*
	19	* This function packages a simple "generic serial" port with no real
	20	* control mechanisms, just raw data transfer over two bulk endpoints.
	21	*
	22	* Because it's not standardized, this isn't as interoperable as the
	23	* CDC ACM driver. However, for many purposes it's just as functional
	24	* if you can arrange appropriate host side drivers.
	25	*/
	26
61d8baea DB	27	struct f_gser {
	28	struct gserial port;
	29	u8 data_id;
	30	u8 port_num;
61d8baea DB	31	};
	32
	33	static inline struct f_gser func_to_gser(struct usb_function f)
	34	{
	35	return container_of(f, struct f_gser, port.func);
	36	}
	37
	38	/-------------------------------------------------------------------------/
	39
	40	/* interface descriptor: */
	41
60540ea2	42	static struct usb_interface_descriptor gser_interface_desc = {
61d8baea DB	43	.bLength = USB_DT_INTERFACE_SIZE,
	44	.bDescriptorType = USB_DT_INTERFACE,
	45	/* .bInterfaceNumber = DYNAMIC */
	46	.bNumEndpoints = 2,
	47	.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
	48	.bInterfaceSubClass = 0,
	49	.bInterfaceProtocol = 0,
	50	/* .iInterface = DYNAMIC */
	51	};
	52
	53	/* full speed support: */
	54
60540ea2	55	static struct usb_endpoint_descriptor gser_fs_in_desc = {
61d8baea DB	56	.bLength = USB_DT_ENDPOINT_SIZE,
	57	.bDescriptorType = USB_DT_ENDPOINT,
	58	.bEndpointAddress = USB_DIR_IN,
	59	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	60	};
	61
60540ea2	62	static struct usb_endpoint_descriptor gser_fs_out_desc = {
61d8baea DB	63	.bLength = USB_DT_ENDPOINT_SIZE,
	64	.bDescriptorType = USB_DT_ENDPOINT,
	65	.bEndpointAddress = USB_DIR_OUT,
	66	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	67	};
	68
60540ea2	69	static struct usb_descriptor_header *gser_fs_function[] = {
61d8baea DB	70	(struct usb_descriptor_header *) &gser_interface_desc,
	71	(struct usb_descriptor_header *) &gser_fs_in_desc,
	72	(struct usb_descriptor_header *) &gser_fs_out_desc,
	73	NULL,
	74	};
	75
	76	/* high speed support: */
	77
60540ea2	78	static struct usb_endpoint_descriptor gser_hs_in_desc = {
61d8baea DB	79	.bLength = USB_DT_ENDPOINT_SIZE,
	80	.bDescriptorType = USB_DT_ENDPOINT,
	81	.bmAttributes = USB_ENDPOINT_XFER_BULK,
551509d2	82	.wMaxPacketSize = cpu_to_le16(512),
61d8baea DB	83	};
61d8baea DB	84
60540ea2	85	static struct usb_endpoint_descriptor gser_hs_out_desc = {
61d8baea DB	86	.bLength = USB_DT_ENDPOINT_SIZE,
	87	.bDescriptorType = USB_DT_ENDPOINT,
	88	.bmAttributes = USB_ENDPOINT_XFER_BULK,
551509d2	89	.wMaxPacketSize = cpu_to_le16(512),
61d8baea DB	90	};
61d8baea DB	91
60540ea2	92	static struct usb_descriptor_header *gser_hs_function[] = {
61d8baea DB	93	(struct usb_descriptor_header *) &gser_interface_desc,
	94	(struct usb_descriptor_header *) &gser_hs_in_desc,
	95	(struct usb_descriptor_header *) &gser_hs_out_desc,
	96	NULL,
	97	};
	98
60540ea2	99	static struct usb_endpoint_descriptor gser_ss_in_desc = {
6fecfb05 SAS	100	.bLength = USB_DT_ENDPOINT_SIZE,
	101	.bDescriptorType = USB_DT_ENDPOINT,
	102	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	103	.wMaxPacketSize = cpu_to_le16(1024),
	104	};
	105
60540ea2	106	static struct usb_endpoint_descriptor gser_ss_out_desc = {
6fecfb05 SAS	107	.bLength = USB_DT_ENDPOINT_SIZE,
	108	.bDescriptorType = USB_DT_ENDPOINT,
	109	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	110	.wMaxPacketSize = cpu_to_le16(1024),
	111	};
	112
60540ea2	113	static struct usb_ss_ep_comp_descriptor gser_ss_bulk_comp_desc = {
6fecfb05 SAS	114	.bLength = sizeof gser_ss_bulk_comp_desc,
	115	.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
	116	};
	117
60540ea2	118	static struct usb_descriptor_header *gser_ss_function[] = {
6fecfb05 SAS	119	(struct usb_descriptor_header *) &gser_interface_desc,
	120	(struct usb_descriptor_header *) &gser_ss_in_desc,
	121	(struct usb_descriptor_header *) &gser_ss_bulk_comp_desc,
	122	(struct usb_descriptor_header *) &gser_ss_out_desc,
	123	(struct usb_descriptor_header *) &gser_ss_bulk_comp_desc,
	124	NULL,
	125	};
	126
61d8baea DB	127	/* string descriptors: */
	128
	129	static struct usb_string gser_string_defs[] = {
	130	[0].s = "Generic Serial",
	131	{ } /* end of list */
	132	};
	133
	134	static struct usb_gadget_strings gser_string_table = {
	135	.language = 0x0409, /* en-us */
	136	.strings = gser_string_defs,
	137	};
	138
	139	static struct usb_gadget_strings *gser_strings[] = {
	140	&gser_string_table,
	141	NULL,
	142	};
	143
	144	/-------------------------------------------------------------------------/
	145
	146	static int gser_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
	147	{
	148	struct f_gser *gser = func_to_gser(f);
	149	struct usb_composite_dev *cdev = f->config->cdev;
	150
	151	/* we know alt == 0, so this is an activation or a reset */
	152
885d22eb	153	if (gser->port.in->enabled) {
b8b0ea51 RL	154	dev_dbg(&cdev->gadget->dev,
b8b0ea51 RL	155	"reset generic ttyGS%d\n", gser->port_num);
61d8baea	156	gserial_disconnect(&gser->port);
ea2a1df7 TB	157	}
ea2a1df7 TB	158	if (!gser->port.in->desc \|\| !gser->port.out->desc) {
b8b0ea51 RL	159	dev_dbg(&cdev->gadget->dev,
b8b0ea51 RL	160	"activate generic ttyGS%d\n", gser->port_num);
fef69644 RJ	161	if (config_ep_by_speed(cdev->gadget, f, gser->port.in) \|\|
fef69644 RJ	162	config_ep_by_speed(cdev->gadget, f, gser->port.out)) {
ea2a1df7 TB	163	gser->port.in->desc = NULL;
	164	gser->port.out->desc = NULL;
	165	return -EINVAL;
	166	}
61d8baea DB	167	}
	168	gserial_connect(&gser->port, gser->port_num);
	169	return 0;
	170	}
	171
	172	static void gser_disable(struct usb_function *f)
	173	{
	174	struct f_gser *gser = func_to_gser(f);
	175	struct usb_composite_dev *cdev = f->config->cdev;
	176
b8b0ea51 RL	177	dev_dbg(&cdev->gadget->dev,
b8b0ea51 RL	178	"generic ttyGS%d deactivated\n", gser->port_num);
61d8baea DB	179	gserial_disconnect(&gser->port);
	180	}
	181
	182	/-------------------------------------------------------------------------/
	183
	184	/* serial function driver setup/binding */
	185
60540ea2	186	static int gser_bind(struct usb_configuration c, struct usb_function f)
61d8baea DB	187	{
	188	struct usb_composite_dev *cdev = c->cdev;
	189	struct f_gser *gser = func_to_gser(f);
	190	int status;
	191	struct usb_ep *ep;
	192
60540ea2 AP	193	/* REVISIT might want instance-specific strings to help
	194	* distinguish instances ...
	195	*/
	196
	197	/* maybe allocate device-global string ID */
	198	if (gser_string_defs[0].id == 0) {
	199	status = usb_string_id(c->cdev);
	200	if (status < 0)
	201	return status;
	202	gser_string_defs[0].id = status;
	203	}
	204
61d8baea DB	205	/* allocate instance-specific interface IDs */
	206	status = usb_interface_id(c, f);
	207	if (status < 0)
	208	goto fail;
	209	gser->data_id = status;
	210	gser_interface_desc.bInterfaceNumber = status;
	211
	212	status = -ENODEV;
	213
	214	/* allocate instance-specific endpoints */
	215	ep = usb_ep_autoconfig(cdev->gadget, &gser_fs_in_desc);
	216	if (!ep)
	217	goto fail;
	218	gser->port.in = ep;
61d8baea DB	219
	220	ep = usb_ep_autoconfig(cdev->gadget, &gser_fs_out_desc);
	221	if (!ep)
	222	goto fail;
	223	gser->port.out = ep;
61d8baea	224
61d8baea DB	225	/* support all relevant hardware speeds... we expect that when
	226	* hardware is dual speed, all bulk-capable endpoints work at
	227	* both speeds
	228	*/
10287bae SAS	229	gser_hs_in_desc.bEndpointAddress = gser_fs_in_desc.bEndpointAddress;
10287bae SAS	230	gser_hs_out_desc.bEndpointAddress = gser_fs_out_desc.bEndpointAddress;
61d8baea	231
10287bae SAS	232	gser_ss_in_desc.bEndpointAddress = gser_fs_in_desc.bEndpointAddress;
	233	gser_ss_out_desc.bEndpointAddress = gser_fs_out_desc.bEndpointAddress;
	234
	235	status = usb_assign_descriptors(f, gser_fs_function, gser_hs_function,
eaef50c7	236	gser_ss_function, NULL);
10287bae SAS	237	if (status)
10287bae SAS	238	goto fail;
b8b0ea51 RL	239	dev_dbg(&cdev->gadget->dev, "generic ttyGS%d: %s speed IN/%s OUT/%s\n",
	240	gser->port_num,
	241	gadget_is_superspeed(c->cdev->gadget) ? "super" :
	242	gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
	243	gser->port.in->name, gser->port.out->name);
61d8baea DB	244	return 0;
	245
	246	fail:
61d8baea DB	247	ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
	248
	249	return status;
	250	}
	251
0b6a1e6f AP	252	static inline struct f_serial_opts to_f_serial_opts(struct config_item item)
	253	{
	254	return container_of(to_config_group(item), struct f_serial_opts,
	255	func_inst.group);
	256	}
	257
0b6a1e6f AP	258	static void serial_attr_release(struct config_item *item)
	259	{
	260	struct f_serial_opts *opts = to_f_serial_opts(item);
	261
	262	usb_put_function_instance(&opts->func_inst);
	263	}
	264
	265	static struct configfs_item_operations serial_item_ops = {
	266	.release = serial_attr_release,
0b6a1e6f AP	267	};
0b6a1e6f AP	268
0b4be4fa	269	static ssize_t f_serial_port_num_show(struct config_item item, char page)
0b6a1e6f	270	{
0b4be4fa	271	return sprintf(page, "%u\n", to_f_serial_opts(item)->port_num);
0b6a1e6f AP	272	}
0b6a1e6f AP	273
0b4be4fa	274	CONFIGFS_ATTR_RO(f_serial_, port_num);
0b6a1e6f AP	275
0b6a1e6f AP	276	static struct configfs_attribute *acm_attrs[] = {
0b4be4fa	277	&f_serial_attr_port_num,
0b6a1e6f AP	278	NULL,
	279	};
	280
	281	static struct config_item_type serial_func_type = {
	282	.ct_item_ops = &serial_item_ops,
	283	.ct_attrs = acm_attrs,
	284	.ct_owner = THIS_MODULE,
	285	};
	286
60540ea2 AP	287	static void gser_free_inst(struct usb_function_instance *f)
	288	{
	289	struct f_serial_opts *opts;
	290
	291	opts = container_of(f, struct f_serial_opts, func_inst);
	292	gserial_free_line(opts->port_num);
	293	kfree(opts);
	294	}
	295
	296	static struct usb_function_instance *gser_alloc_inst(void)
	297	{
	298	struct f_serial_opts *opts;
	299	int ret;
	300
	301	opts = kzalloc(sizeof(*opts), GFP_KERNEL);
	302	if (!opts)
	303	return ERR_PTR(-ENOMEM);
	304
	305	opts->func_inst.free_func_inst = gser_free_inst;
	306	ret = gserial_alloc_line(&opts->port_num);
	307	if (ret) {
	308	kfree(opts);
	309	return ERR_PTR(ret);
	310	}
0b6a1e6f AP	311	config_group_init_type_name(&opts->func_inst.group, "",
0b6a1e6f AP	312	&serial_func_type);
60540ea2 AP	313
	314	return &opts->func_inst;
	315	}
	316
	317	static void gser_free(struct usb_function *f)
	318	{
	319	struct f_gser *serial;
	320
	321	serial = func_to_gser(f);
	322	kfree(serial);
	323	}
	324
	325	static void gser_unbind(struct usb_configuration c, struct usb_function f)
	326	{
	327	usb_free_all_descriptors(f);
	328	}
	329
b3d589f2	330	static struct usb_function gser_alloc(struct usb_function_instance fi)
60540ea2 AP	331	{
	332	struct f_gser *gser;
	333	struct f_serial_opts *opts;
	334
	335	/* allocate and initialize one new instance */
	336	gser = kzalloc(sizeof(*gser), GFP_KERNEL);
	337	if (!gser)
	338	return ERR_PTR(-ENOMEM);
	339
	340	opts = container_of(fi, struct f_serial_opts, func_inst);
	341
	342	gser->port_num = opts->port_num;
	343
	344	gser->port.func.name = "gser";
	345	gser->port.func.strings = gser_strings;
	346	gser->port.func.bind = gser_bind;
	347	gser->port.func.unbind = gser_unbind;
	348	gser->port.func.set_alt = gser_set_alt;
	349	gser->port.func.disable = gser_disable;
	350	gser->port.func.free_func = gser_free;
	351
	352	return &gser->port.func;
	353	}
	354
	355	DECLARE_USB_FUNCTION_INIT(gser, gser_alloc_inst, gser_alloc);
	356	MODULE_LICENSE("GPL");
	357	MODULE_AUTHOR("Al Borchers");
	358	MODULE_AUTHOR("David Brownell");