[net-next-2.6.git] / drivers / usb / gadget / 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/kernel.h>
#include <linux/device.h>

#include "u_serial.h"
#include "gadget_chips.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 gser_descs {
	struct usb_endpoint_descriptor	*in;
	struct usb_endpoint_descriptor	*out;
};

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

	struct gser_descs		fs;
	struct gser_descs		hs;
};

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 __initdata = {
	.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 __initdata = {
	.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 __initdata = {
	.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[] __initdata = {
	(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 __initdata = {
	.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 __initdata = {
	.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[] __initdata = {
	(struct usb_descriptor_header *) &gser_interface_desc,
	(struct usb_descriptor_header *) &gser_hs_in_desc,
	(struct usb_descriptor_header *) &gser_hs_out_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) {
		DBG(cdev, "reset generic ttyGS%d\n", gser->port_num);
		gserial_disconnect(&gser->port);
	} else {
		DBG(cdev, "activate generic ttyGS%d\n", gser->port_num);
		gser->port.in_desc = ep_choose(cdev->gadget,
				gser->hs.in, gser->fs.in);
		gser->port.out_desc = ep_choose(cdev->gadget,
				gser->hs.out, gser->fs.out);
	}
	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;

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

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

/* serial function driver setup/binding */

static int __init
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;

	/* 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 */

	/* copy descriptors, and track endpoint copies */
	f->descriptors = usb_copy_descriptors(gser_fs_function);

	gser->fs.in = usb_find_endpoint(gser_fs_function,
			f->descriptors, &gser_fs_in_desc);
	gser->fs.out = usb_find_endpoint(gser_fs_function,
			f->descriptors, &gser_fs_out_desc);


	/* support all relevant hardware speeds... we expect that when
	 * hardware is dual speed, all bulk-capable endpoints work at
	 * both speeds
	 */
	if (gadget_is_dualspeed(c->cdev->gadget)) {
		gser_hs_in_desc.bEndpointAddress =
				gser_fs_in_desc.bEndpointAddress;
		gser_hs_out_desc.bEndpointAddress =
				gser_fs_out_desc.bEndpointAddress;

		/* copy descriptors, and track endpoint copies */
		f->hs_descriptors = usb_copy_descriptors(gser_hs_function);

		gser->hs.in = usb_find_endpoint(gser_hs_function,
				f->hs_descriptors, &gser_hs_in_desc);
		gser->hs.out = usb_find_endpoint(gser_hs_function,
				f->hs_descriptors, &gser_hs_out_desc);
	}

	DBG(cdev, "generic ttyGS%d: %s speed IN/%s OUT/%s\n",
			gser->port_num,
			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 void
gser_unbind(struct usb_configuration *c, struct usb_function *f)
{
	if (gadget_is_dualspeed(c->cdev->gadget))
		usb_free_descriptors(f->hs_descriptors);
	usb_free_descriptors(f->descriptors);
	kfree(func_to_gser(f));
}

/**
 * gser_bind_config - add a generic serial function to a configuration
 * @c: the configuration to support the serial instance
 * @port_num: /dev/ttyGS* port this interface will use
 * Context: single threaded during gadget setup
 *
 * Returns zero on success, else negative errno.
 *
 * Caller must have called @gserial_setup() with enough ports to
 * handle all the ones it binds.  Caller is also responsible
 * for calling @gserial_cleanup() before module unload.
 */
int __init gser_bind_config(struct usb_configuration *c, u8 port_num)
{
	struct f_gser	*gser;
	int		status;

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

	gser->port_num = 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;

	status = usb_add_function(c, &gser->port.func);
	if (status)
		kfree(gser);
	return status;
}
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
	13	#include <linux/kernel.h>
	14	#include <linux/device.h>
	15
	16	#include "u_serial.h"
	17	#include "gadget_chips.h"
	18
	19
	20	/*
	21	* This function packages a simple "generic serial" port with no real
	22	* control mechanisms, just raw data transfer over two bulk endpoints.
	23	*
	24	* Because it's not standardized, this isn't as interoperable as the
	25	* CDC ACM driver. However, for many purposes it's just as functional
	26	* if you can arrange appropriate host side drivers.
	27	*/
	28
	29	struct gser_descs {
	30	struct usb_endpoint_descriptor *in;
	31	struct usb_endpoint_descriptor *out;
	32	};
	33
	34	struct f_gser {
	35	struct gserial port;
	36	u8 data_id;
	37	u8 port_num;
	38
61d8baea	39	struct gser_descs fs;
61d8baea DB	40	struct gser_descs hs;
	41	};
	42
	43	static inline struct f_gser func_to_gser(struct usb_function f)
	44	{
	45	return container_of(f, struct f_gser, port.func);
	46	}
	47
	48	/-------------------------------------------------------------------------/
	49
	50	/* interface descriptor: */
	51
	52	static struct usb_interface_descriptor gser_interface_desc __initdata = {
	53	.bLength = USB_DT_INTERFACE_SIZE,
	54	.bDescriptorType = USB_DT_INTERFACE,
	55	/* .bInterfaceNumber = DYNAMIC */
	56	.bNumEndpoints = 2,
	57	.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
	58	.bInterfaceSubClass = 0,
	59	.bInterfaceProtocol = 0,
	60	/* .iInterface = DYNAMIC */
	61	};
	62
	63	/* full speed support: */
	64
	65	static struct usb_endpoint_descriptor gser_fs_in_desc __initdata = {
	66	.bLength = USB_DT_ENDPOINT_SIZE,
	67	.bDescriptorType = USB_DT_ENDPOINT,
	68	.bEndpointAddress = USB_DIR_IN,
	69	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	70	};
	71
	72	static struct usb_endpoint_descriptor gser_fs_out_desc __initdata = {
	73	.bLength = USB_DT_ENDPOINT_SIZE,
	74	.bDescriptorType = USB_DT_ENDPOINT,
	75	.bEndpointAddress = USB_DIR_OUT,
	76	.bmAttributes = USB_ENDPOINT_XFER_BULK,
	77	};
	78
	79	static struct usb_descriptor_header *gser_fs_function[] __initdata = {
	80	(struct usb_descriptor_header *) &gser_interface_desc,
	81	(struct usb_descriptor_header *) &gser_fs_in_desc,
	82	(struct usb_descriptor_header *) &gser_fs_out_desc,
	83	NULL,
	84	};
	85
	86	/* high speed support: */
	87
	88	static struct usb_endpoint_descriptor gser_hs_in_desc __initdata = {
	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	};
	94
	95	static struct usb_endpoint_descriptor gser_hs_out_desc __initdata = {
	96	.bLength = USB_DT_ENDPOINT_SIZE,
	97	.bDescriptorType = USB_DT_ENDPOINT,
	98	.bmAttributes = USB_ENDPOINT_XFER_BULK,
551509d2	99	.wMaxPacketSize = cpu_to_le16(512),
61d8baea DB	100	};
	101
	102	static struct usb_descriptor_header *gser_hs_function[] __initdata = {
	103	(struct usb_descriptor_header *) &gser_interface_desc,
	104	(struct usb_descriptor_header *) &gser_hs_in_desc,
	105	(struct usb_descriptor_header *) &gser_hs_out_desc,
	106	NULL,
	107	};
	108
	109	/* string descriptors: */
	110
	111	static struct usb_string gser_string_defs[] = {
	112	[0].s = "Generic Serial",
	113	{ } /* end of list */
	114	};
	115
	116	static struct usb_gadget_strings gser_string_table = {
	117	.language = 0x0409, /* en-us */
	118	.strings = gser_string_defs,
	119	};
	120
	121	static struct usb_gadget_strings *gser_strings[] = {
	122	&gser_string_table,
	123	NULL,
	124	};
	125
	126	/-------------------------------------------------------------------------/
	127
	128	static int gser_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
	129	{
	130	struct f_gser *gser = func_to_gser(f);
	131	struct usb_composite_dev *cdev = f->config->cdev;
	132
	133	/* we know alt == 0, so this is an activation or a reset */
	134
	135	if (gser->port.in->driver_data) {
	136	DBG(cdev, "reset generic ttyGS%d\n", gser->port_num);
	137	gserial_disconnect(&gser->port);
	138	} else {
	139	DBG(cdev, "activate generic ttyGS%d\n", gser->port_num);
	140	gser->port.in_desc = ep_choose(cdev->gadget,
	141	gser->hs.in, gser->fs.in);
	142	gser->port.out_desc = ep_choose(cdev->gadget,
	143	gser->hs.out, gser->fs.out);
	144	}
	145	gserial_connect(&gser->port, gser->port_num);
	146	return 0;
	147	}
	148
	149	static void gser_disable(struct usb_function *f)
	150	{
	151	struct f_gser *gser = func_to_gser(f);
	152	struct usb_composite_dev *cdev = f->config->cdev;
	153
	154	DBG(cdev, "generic ttyGS%d deactivated\n", gser->port_num);
	155	gserial_disconnect(&gser->port);
	156	}
	157
	158	/-------------------------------------------------------------------------/
	159
	160	/* serial function driver setup/binding */
	161
	162	static int __init
	163	gser_bind(struct usb_configuration c, struct usb_function f)
164	{
165	struct usb_composite_dev *cdev = c->cdev;
166	struct f_gser *gser = func_to_gser(f);
167	int status;
168	struct usb_ep *ep;
169
170	/* allocate instance-specific interface IDs */
171	status = usb_interface_id(c, f);
172	if (status < 0)
173	goto fail;
174	gser->data_id = status;
175	gser_interface_desc.bInterfaceNumber = status;
176
177	status = -ENODEV;
178
179	/* allocate instance-specific endpoints */
180	ep = usb_ep_autoconfig(cdev->gadget, &gser_fs_in_desc);
181	if (!ep)
182	goto fail;
183	gser->port.in = ep;
184	ep->driver_data = cdev; /* claim */
185
186	ep = usb_ep_autoconfig(cdev->gadget, &gser_fs_out_desc);
187	if (!ep)
188	goto fail;
189	gser->port.out = ep;
190	ep->driver_data = cdev; /* claim */
191
192	/* copy descriptors, and track endpoint copies */
193	f->descriptors = usb_copy_descriptors(gser_fs_function);
194
195	gser->fs.in = usb_find_endpoint(gser_fs_function,
196	f->descriptors, &gser_fs_in_desc);
197	gser->fs.out = usb_find_endpoint(gser_fs_function,
198	f->descriptors, &gser_fs_out_desc);
199
200
201	/* support all relevant hardware speeds... we expect that when
202	* hardware is dual speed, all bulk-capable endpoints work at
203	* both speeds
204	*/
205	if (gadget_is_dualspeed(c->cdev->gadget)) {
206	gser_hs_in_desc.bEndpointAddress =
207	gser_fs_in_desc.bEndpointAddress;
208	gser_hs_out_desc.bEndpointAddress =
209	gser_fs_out_desc.bEndpointAddress;
210
211	/* copy descriptors, and track endpoint copies */
212	f->hs_descriptors = usb_copy_descriptors(gser_hs_function);
213
214	gser->hs.in = usb_find_endpoint(gser_hs_function,
215	f->hs_descriptors, &gser_hs_in_desc);
216	gser->hs.out = usb_find_endpoint(gser_hs_function,
217	f->hs_descriptors, &gser_hs_out_desc);
218	}
219
220	DBG(cdev, "generic ttyGS%d: %s speed IN/%s OUT/%s\n",
221	gser->port_num,
222	gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
223	gser->port.in->name, gser->port.out->name);
224	return 0;
225
226	fail:
227	/* we might as well release our claims on endpoints */
228	if (gser->port.out)
229	gser->port.out->driver_data = NULL;
230	if (gser->port.in)
231	gser->port.in->driver_data = NULL;
232
233	ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
234
235	return status;
236	}
237
238	static void
239	gser_unbind(struct usb_configuration c, struct usb_function f)
240	{
241	if (gadget_is_dualspeed(c->cdev->gadget))
242	usb_free_descriptors(f->hs_descriptors);
243	usb_free_descriptors(f->descriptors);
244	kfree(func_to_gser(f));
245	}
246
247	/**
248	* gser_bind_config - add a generic serial function to a configuration
249	* @c: the configuration to support the serial instance
250	* @port_num: /dev/ttyGS* port this interface will use
251	* Context: single threaded during gadget setup
252	*
253	* Returns zero on success, else negative errno.
254	*
255	* Caller must have called @gserial_setup() with enough ports to
256	* handle all the ones it binds. Caller is also responsible
257	* for calling @gserial_cleanup() before module unload.
258	*/
259	int __init gser_bind_config(struct usb_configuration *c, u8 port_num)
260	{
261	struct f_gser *gser;
262	int status;
263
264	/* REVISIT might want instance-specific strings to help
265	* distinguish instances ...
266	*/
267
268	/* maybe allocate device-global string ID */
269	if (gser_string_defs[0].id == 0) {
270	status = usb_string_id(c->cdev);
271	if (status < 0)
272	return status;
273	gser_string_defs[0].id = status;
274	}
275
276	/* allocate and initialize one new instance */
277	gser = kzalloc(sizeof *gser, GFP_KERNEL);
278	if (!gser)
279	return -ENOMEM;
280
281	gser->port_num = port_num;
282
283	gser->port.func.name = "gser";
284	gser->port.func.strings = gser_strings;
285	gser->port.func.bind = gser_bind;
286	gser->port.func.unbind = gser_unbind;
287	gser->port.func.set_alt = gser_set_alt;
288	gser->port.func.disable = gser_disable;
289
290	status = usb_add_function(c, &gser->port.func);
291	if (status)
292	kfree(gser);
293	return status;
294	}