[deliverable/linux.git] / drivers / usb / gadget / function / f_serial.c

/*
 * 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
 *
 * This software is distributed under the terms of the GNU General
 * Public License ("GPL") as published by the Free Software Foundation,
 * either version 2 of that License or (at your option) any later version.
 */

#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->driver_data) {
		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->driver_data = cdev;	/* claim */

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

	/* 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);
	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:
	/* we might as well release our claims on endpoints */
	if (gser->port.out)
		gser->port.out->driver_data = NULL;
	if (gser->port.in)
		gser->port.in->driver_data = NULL;

	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);
}

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;

	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
61d8baea DB	1	/*
	2	* f_serial.c - generic USB serial function driver
	3	*
	4	* Copyright (C) 2003 Al Borchers (alborchers@steinerpoint.com)
	5	* Copyright (C) 2008 by David Brownell
	6	* Copyright (C) 2008 by Nokia Corporation
	7	*
	8	* This software is distributed under the terms of the GNU General
	9	* Public License ("GPL") as published by the Free Software Foundation,
	10	* either version 2 of that License or (at your option) any later version.
	11	*/
	12
5a0e3ad6	13	#include <linux/slab.h>
61d8baea	14	#include <linux/kernel.h>
60540ea2	15	#include <linux/module.h>
61d8baea DB	16	#include <linux/device.h>
	17
	18	#include "u_serial.h"
61d8baea DB	19
	20
	21	/*
	22	* This function packages a simple "generic serial" port with no real
	23	* control mechanisms, just raw data transfer over two bulk endpoints.
	24	*
	25	* Because it's not standardized, this isn't as interoperable as the
	26	* CDC ACM driver. However, for many purposes it's just as functional
	27	* if you can arrange appropriate host side drivers.
	28	*/
	29
61d8baea DB	30	struct f_gser {
	31	struct gserial port;
	32	u8 data_id;
	33	u8 port_num;
61d8baea DB	34	};
	35
	36	static inline struct f_gser func_to_gser(struct usb_function f)
	37	{
	38	return container_of(f, struct f_gser, port.func);
	39	}
	40
	41	/-------------------------------------------------------------------------/
	42
	43	/* interface descriptor: */
	44
60540ea2	45	static struct usb_interface_descriptor gser_interface_desc = {
61d8baea DB	46	.bLength = USB_DT_INTERFACE_SIZE,
	47	.bDescriptorType = USB_DT_INTERFACE,
	48	/* .bInterfaceNumber = DYNAMIC */
	49	.bNumEndpoints = 2,
	50	.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
	51	.bInterfaceSubClass = 0,
	52	.bInterfaceProtocol = 0,
	53	/* .iInterface = DYNAMIC */
	54	};
	55
	56	/* full speed support: */
	57
60540ea2	58	static struct usb_endpoint_descriptor gser_fs_in_desc = {
61d8baea DB	59	.bLength = USB_DT_ENDPOINT_SIZE,
	60	.bDescriptorType = USB_DT_ENDPOINT,
	61	.bEndpointAddress = USB_DIR_IN,
	62	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	63	};
	64
60540ea2	65	static struct usb_endpoint_descriptor gser_fs_out_desc = {
61d8baea DB	66	.bLength = USB_DT_ENDPOINT_SIZE,
	67	.bDescriptorType = USB_DT_ENDPOINT,
	68	.bEndpointAddress = USB_DIR_OUT,
	69	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	70	};
	71
60540ea2	72	static struct usb_descriptor_header *gser_fs_function[] = {
61d8baea DB	73	(struct usb_descriptor_header *) &gser_interface_desc,
	74	(struct usb_descriptor_header *) &gser_fs_in_desc,
	75	(struct usb_descriptor_header *) &gser_fs_out_desc,
	76	NULL,
	77	};
	78
	79	/* high speed support: */
	80
60540ea2	81	static struct usb_endpoint_descriptor gser_hs_in_desc = {
61d8baea DB	82	.bLength = USB_DT_ENDPOINT_SIZE,
	83	.bDescriptorType = USB_DT_ENDPOINT,
	84	.bmAttributes = USB_ENDPOINT_XFER_BULK,
551509d2	85	.wMaxPacketSize = cpu_to_le16(512),
61d8baea DB	86	};
61d8baea DB	87
60540ea2	88	static struct usb_endpoint_descriptor gser_hs_out_desc = {
61d8baea DB	89	.bLength = USB_DT_ENDPOINT_SIZE,
	90	.bDescriptorType = USB_DT_ENDPOINT,
	91	.bmAttributes = USB_ENDPOINT_XFER_BULK,
551509d2	92	.wMaxPacketSize = cpu_to_le16(512),
61d8baea DB	93	};
61d8baea DB	94
60540ea2	95	static struct usb_descriptor_header *gser_hs_function[] = {
61d8baea DB	96	(struct usb_descriptor_header *) &gser_interface_desc,
	97	(struct usb_descriptor_header *) &gser_hs_in_desc,
	98	(struct usb_descriptor_header *) &gser_hs_out_desc,
	99	NULL,
	100	};
	101
60540ea2	102	static struct usb_endpoint_descriptor gser_ss_in_desc = {
6fecfb05 SAS	103	.bLength = USB_DT_ENDPOINT_SIZE,
	104	.bDescriptorType = USB_DT_ENDPOINT,
	105	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	106	.wMaxPacketSize = cpu_to_le16(1024),
	107	};
	108
60540ea2	109	static struct usb_endpoint_descriptor gser_ss_out_desc = {
6fecfb05 SAS	110	.bLength = USB_DT_ENDPOINT_SIZE,
	111	.bDescriptorType = USB_DT_ENDPOINT,
	112	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	113	.wMaxPacketSize = cpu_to_le16(1024),
	114	};
	115
60540ea2	116	static struct usb_ss_ep_comp_descriptor gser_ss_bulk_comp_desc = {
6fecfb05 SAS	117	.bLength = sizeof gser_ss_bulk_comp_desc,
	118	.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
	119	};
	120
60540ea2	121	static struct usb_descriptor_header *gser_ss_function[] = {
6fecfb05 SAS	122	(struct usb_descriptor_header *) &gser_interface_desc,
	123	(struct usb_descriptor_header *) &gser_ss_in_desc,
	124	(struct usb_descriptor_header *) &gser_ss_bulk_comp_desc,
	125	(struct usb_descriptor_header *) &gser_ss_out_desc,
	126	(struct usb_descriptor_header *) &gser_ss_bulk_comp_desc,
	127	NULL,
	128	};
	129
61d8baea DB	130	/* string descriptors: */
	131
	132	static struct usb_string gser_string_defs[] = {
	133	[0].s = "Generic Serial",
	134	{ } /* end of list */
	135	};
	136
	137	static struct usb_gadget_strings gser_string_table = {
	138	.language = 0x0409, /* en-us */
	139	.strings = gser_string_defs,
	140	};
	141
	142	static struct usb_gadget_strings *gser_strings[] = {
	143	&gser_string_table,
	144	NULL,
	145	};
	146
	147	/-------------------------------------------------------------------------/
	148
	149	static int gser_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
	150	{
	151	struct f_gser *gser = func_to_gser(f);
	152	struct usb_composite_dev *cdev = f->config->cdev;
	153
	154	/* we know alt == 0, so this is an activation or a reset */
	155
	156	if (gser->port.in->driver_data) {
b8b0ea51 RL	157	dev_dbg(&cdev->gadget->dev,
b8b0ea51 RL	158	"reset generic ttyGS%d\n", gser->port_num);
61d8baea	159	gserial_disconnect(&gser->port);
ea2a1df7 TB	160	}
ea2a1df7 TB	161	if (!gser->port.in->desc \|\| !gser->port.out->desc) {
b8b0ea51 RL	162	dev_dbg(&cdev->gadget->dev,
b8b0ea51 RL	163	"activate generic ttyGS%d\n", gser->port_num);
fef69644 RJ	164	if (config_ep_by_speed(cdev->gadget, f, gser->port.in) \|\|
fef69644 RJ	165	config_ep_by_speed(cdev->gadget, f, gser->port.out)) {
ea2a1df7 TB	166	gser->port.in->desc = NULL;
	167	gser->port.out->desc = NULL;
	168	return -EINVAL;
	169	}
61d8baea DB	170	}
	171	gserial_connect(&gser->port, gser->port_num);
	172	return 0;
	173	}
	174
	175	static void gser_disable(struct usb_function *f)
	176	{
	177	struct f_gser *gser = func_to_gser(f);
	178	struct usb_composite_dev *cdev = f->config->cdev;
	179
b8b0ea51 RL	180	dev_dbg(&cdev->gadget->dev,
b8b0ea51 RL	181	"generic ttyGS%d deactivated\n", gser->port_num);
61d8baea DB	182	gserial_disconnect(&gser->port);
	183	}
	184
	185	/-------------------------------------------------------------------------/
	186
	187	/* serial function driver setup/binding */
	188
60540ea2	189	static int gser_bind(struct usb_configuration c, struct usb_function f)
61d8baea DB	190	{
	191	struct usb_composite_dev *cdev = c->cdev;
	192	struct f_gser *gser = func_to_gser(f);
	193	int status;
	194	struct usb_ep *ep;
	195
60540ea2 AP	196	/* REVISIT might want instance-specific strings to help
	197	* distinguish instances ...
	198	*/
	199
	200	/* maybe allocate device-global string ID */
	201	if (gser_string_defs[0].id == 0) {
	202	status = usb_string_id(c->cdev);
	203	if (status < 0)
	204	return status;
	205	gser_string_defs[0].id = status;
	206	}
	207
61d8baea DB	208	/* allocate instance-specific interface IDs */
	209	status = usb_interface_id(c, f);
	210	if (status < 0)
	211	goto fail;
	212	gser->data_id = status;
	213	gser_interface_desc.bInterfaceNumber = status;
	214
	215	status = -ENODEV;
	216
	217	/* allocate instance-specific endpoints */
	218	ep = usb_ep_autoconfig(cdev->gadget, &gser_fs_in_desc);
	219	if (!ep)
	220	goto fail;
	221	gser->port.in = ep;
	222	ep->driver_data = cdev; /* claim */
	223
	224	ep = usb_ep_autoconfig(cdev->gadget, &gser_fs_out_desc);
	225	if (!ep)
	226	goto fail;
	227	gser->port.out = ep;
	228	ep->driver_data = cdev; /* claim */
	229
61d8baea DB	230	/* support all relevant hardware speeds... we expect that when
	231	* hardware is dual speed, all bulk-capable endpoints work at
	232	* both speeds
	233	*/
10287bae SAS	234	gser_hs_in_desc.bEndpointAddress = gser_fs_in_desc.bEndpointAddress;
10287bae SAS	235	gser_hs_out_desc.bEndpointAddress = gser_fs_out_desc.bEndpointAddress;
61d8baea	236
10287bae SAS	237	gser_ss_in_desc.bEndpointAddress = gser_fs_in_desc.bEndpointAddress;
	238	gser_ss_out_desc.bEndpointAddress = gser_fs_out_desc.bEndpointAddress;
	239
	240	status = usb_assign_descriptors(f, gser_fs_function, gser_hs_function,
	241	gser_ss_function);
	242	if (status)
	243	goto fail;
b8b0ea51 RL	244	dev_dbg(&cdev->gadget->dev, "generic ttyGS%d: %s speed IN/%s OUT/%s\n",
	245	gser->port_num,
	246	gadget_is_superspeed(c->cdev->gadget) ? "super" :
	247	gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
	248	gser->port.in->name, gser->port.out->name);
61d8baea DB	249	return 0;
	250
	251	fail:
	252	/* we might as well release our claims on endpoints */
	253	if (gser->port.out)
	254	gser->port.out->driver_data = NULL;
	255	if (gser->port.in)
	256	gser->port.in->driver_data = NULL;
	257
	258	ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
	259
	260	return status;
	261	}
	262
0b6a1e6f AP	263	static inline struct f_serial_opts to_f_serial_opts(struct config_item item)
	264	{
	265	return container_of(to_config_group(item), struct f_serial_opts,
	266	func_inst.group);
	267	}
	268
	269	CONFIGFS_ATTR_STRUCT(f_serial_opts);
	270	static ssize_t f_serial_attr_show(struct config_item *item,
	271	struct configfs_attribute *attr,
	272	char *page)
	273	{
	274	struct f_serial_opts *opts = to_f_serial_opts(item);
	275	struct f_serial_opts_attribute *f_serial_opts_attr =
	276	container_of(attr, struct f_serial_opts_attribute, attr);
	277	ssize_t ret = 0;
	278
	279	if (f_serial_opts_attr->show)
	280	ret = f_serial_opts_attr->show(opts, page);
	281
	282	return ret;
	283	}
	284
	285	static void serial_attr_release(struct config_item *item)
	286	{
	287	struct f_serial_opts *opts = to_f_serial_opts(item);
	288
	289	usb_put_function_instance(&opts->func_inst);
	290	}
	291
	292	static struct configfs_item_operations serial_item_ops = {
	293	.release = serial_attr_release,
	294	.show_attribute = f_serial_attr_show,
	295	};
	296
	297	static ssize_t f_serial_port_num_show(struct f_serial_opts opts, char page)
	298	{
	299	return sprintf(page, "%u\n", opts->port_num);
	300	}
	301
	302	static struct f_serial_opts_attribute f_serial_port_num =
	303	__CONFIGFS_ATTR_RO(port_num, f_serial_port_num_show);
	304
	305	static struct configfs_attribute *acm_attrs[] = {
	306	&f_serial_port_num.attr,
	307	NULL,
	308	};
	309
	310	static struct config_item_type serial_func_type = {
	311	.ct_item_ops = &serial_item_ops,
	312	.ct_attrs = acm_attrs,
	313	.ct_owner = THIS_MODULE,
	314	};
	315
60540ea2 AP	316	static void gser_free_inst(struct usb_function_instance *f)
	317	{
	318	struct f_serial_opts *opts;
	319
	320	opts = container_of(f, struct f_serial_opts, func_inst);
	321	gserial_free_line(opts->port_num);
	322	kfree(opts);
	323	}
	324
	325	static struct usb_function_instance *gser_alloc_inst(void)
	326	{
	327	struct f_serial_opts *opts;
	328	int ret;
	329
	330	opts = kzalloc(sizeof(*opts), GFP_KERNEL);
	331	if (!opts)
	332	return ERR_PTR(-ENOMEM);
	333
	334	opts->func_inst.free_func_inst = gser_free_inst;
	335	ret = gserial_alloc_line(&opts->port_num);
	336	if (ret) {
	337	kfree(opts);
	338	return ERR_PTR(ret);
	339	}
0b6a1e6f AP	340	config_group_init_type_name(&opts->func_inst.group, "",
0b6a1e6f AP	341	&serial_func_type);
60540ea2 AP	342
	343	return &opts->func_inst;
	344	}
	345
	346	static void gser_free(struct usb_function *f)
	347	{
	348	struct f_gser *serial;
	349
	350	serial = func_to_gser(f);
	351	kfree(serial);
	352	}
	353
	354	static void gser_unbind(struct usb_configuration c, struct usb_function f)
	355	{
	356	usb_free_all_descriptors(f);
	357	}
	358
b3d589f2	359	static struct usb_function gser_alloc(struct usb_function_instance fi)
60540ea2 AP	360	{
	361	struct f_gser *gser;
	362	struct f_serial_opts *opts;
	363
	364	/* allocate and initialize one new instance */
	365	gser = kzalloc(sizeof(*gser), GFP_KERNEL);
	366	if (!gser)
	367	return ERR_PTR(-ENOMEM);
	368
	369	opts = container_of(fi, struct f_serial_opts, func_inst);
	370
	371	gser->port_num = opts->port_num;
	372
	373	gser->port.func.name = "gser";
	374	gser->port.func.strings = gser_strings;
	375	gser->port.func.bind = gser_bind;
	376	gser->port.func.unbind = gser_unbind;
	377	gser->port.func.set_alt = gser_set_alt;
	378	gser->port.func.disable = gser_disable;
	379	gser->port.func.free_func = gser_free;
	380
	381	return &gser->port.func;
	382	}
	383
	384	DECLARE_USB_FUNCTION_INIT(gser, gser_alloc_inst, gser_alloc);
	385	MODULE_LICENSE("GPL");
	386	MODULE_AUTHOR("Al Borchers");
	387	MODULE_AUTHOR("David Brownell");