15fd54aceSGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0+
200a2430fSAndrzej Pietrasiewicz /*
300a2430fSAndrzej Pietrasiewicz * f_loopback.c - USB peripheral loopback configuration driver
400a2430fSAndrzej Pietrasiewicz *
500a2430fSAndrzej Pietrasiewicz * Copyright (C) 2003-2008 David Brownell
600a2430fSAndrzej Pietrasiewicz * Copyright (C) 2008 by Nokia Corporation
700a2430fSAndrzej Pietrasiewicz */
800a2430fSAndrzej Pietrasiewicz
900a2430fSAndrzej Pietrasiewicz /* #define VERBOSE_DEBUG */
1000a2430fSAndrzej Pietrasiewicz
1100a2430fSAndrzej Pietrasiewicz #include <linux/slab.h>
1200a2430fSAndrzej Pietrasiewicz #include <linux/kernel.h>
1300a2430fSAndrzej Pietrasiewicz #include <linux/device.h>
1400a2430fSAndrzej Pietrasiewicz #include <linux/module.h>
1500a2430fSAndrzej Pietrasiewicz #include <linux/err.h>
1600a2430fSAndrzej Pietrasiewicz #include <linux/usb/composite.h>
17*d9c61bb3SMichael Grzeschik #include <linux/usb/func_utils.h>
1800a2430fSAndrzej Pietrasiewicz
1900a2430fSAndrzej Pietrasiewicz #include "g_zero.h"
2000a2430fSAndrzej Pietrasiewicz
2100a2430fSAndrzej Pietrasiewicz /*
2200a2430fSAndrzej Pietrasiewicz * LOOPBACK FUNCTION ... a testing vehicle for USB peripherals,
2300a2430fSAndrzej Pietrasiewicz *
2400a2430fSAndrzej Pietrasiewicz * This takes messages of various sizes written OUT to a device, and loops
2500a2430fSAndrzej Pietrasiewicz * them back so they can be read IN from it. It has been used by certain
2600a2430fSAndrzej Pietrasiewicz * test applications. It supports limited testing of data queueing logic.
2700a2430fSAndrzej Pietrasiewicz */
2800a2430fSAndrzej Pietrasiewicz struct f_loopback {
2900a2430fSAndrzej Pietrasiewicz struct usb_function function;
3000a2430fSAndrzej Pietrasiewicz
3100a2430fSAndrzej Pietrasiewicz struct usb_ep *in_ep;
3200a2430fSAndrzej Pietrasiewicz struct usb_ep *out_ep;
333e9d992fSKrzysztof Opasiak
343e9d992fSKrzysztof Opasiak unsigned qlen;
353e9d992fSKrzysztof Opasiak unsigned buflen;
3600a2430fSAndrzej Pietrasiewicz };
3700a2430fSAndrzej Pietrasiewicz
func_to_loop(struct usb_function * f)3800a2430fSAndrzej Pietrasiewicz static inline struct f_loopback *func_to_loop(struct usb_function *f)
3900a2430fSAndrzej Pietrasiewicz {
4000a2430fSAndrzej Pietrasiewicz return container_of(f, struct f_loopback, function);
4100a2430fSAndrzej Pietrasiewicz }
4200a2430fSAndrzej Pietrasiewicz
4300a2430fSAndrzej Pietrasiewicz /*-------------------------------------------------------------------------*/
4400a2430fSAndrzej Pietrasiewicz
4500a2430fSAndrzej Pietrasiewicz static struct usb_interface_descriptor loopback_intf = {
463e9d992fSKrzysztof Opasiak .bLength = sizeof(loopback_intf),
4700a2430fSAndrzej Pietrasiewicz .bDescriptorType = USB_DT_INTERFACE,
4800a2430fSAndrzej Pietrasiewicz
4900a2430fSAndrzej Pietrasiewicz .bNumEndpoints = 2,
5000a2430fSAndrzej Pietrasiewicz .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
5100a2430fSAndrzej Pietrasiewicz /* .iInterface = DYNAMIC */
5200a2430fSAndrzej Pietrasiewicz };
5300a2430fSAndrzej Pietrasiewicz
5400a2430fSAndrzej Pietrasiewicz /* full speed support: */
5500a2430fSAndrzej Pietrasiewicz
5600a2430fSAndrzej Pietrasiewicz static struct usb_endpoint_descriptor fs_loop_source_desc = {
5700a2430fSAndrzej Pietrasiewicz .bLength = USB_DT_ENDPOINT_SIZE,
5800a2430fSAndrzej Pietrasiewicz .bDescriptorType = USB_DT_ENDPOINT,
5900a2430fSAndrzej Pietrasiewicz
6000a2430fSAndrzej Pietrasiewicz .bEndpointAddress = USB_DIR_IN,
6100a2430fSAndrzej Pietrasiewicz .bmAttributes = USB_ENDPOINT_XFER_BULK,
6200a2430fSAndrzej Pietrasiewicz };
6300a2430fSAndrzej Pietrasiewicz
6400a2430fSAndrzej Pietrasiewicz static struct usb_endpoint_descriptor fs_loop_sink_desc = {
6500a2430fSAndrzej Pietrasiewicz .bLength = USB_DT_ENDPOINT_SIZE,
6600a2430fSAndrzej Pietrasiewicz .bDescriptorType = USB_DT_ENDPOINT,
6700a2430fSAndrzej Pietrasiewicz
6800a2430fSAndrzej Pietrasiewicz .bEndpointAddress = USB_DIR_OUT,
6900a2430fSAndrzej Pietrasiewicz .bmAttributes = USB_ENDPOINT_XFER_BULK,
7000a2430fSAndrzej Pietrasiewicz };
7100a2430fSAndrzej Pietrasiewicz
7200a2430fSAndrzej Pietrasiewicz static struct usb_descriptor_header *fs_loopback_descs[] = {
7300a2430fSAndrzej Pietrasiewicz (struct usb_descriptor_header *) &loopback_intf,
7400a2430fSAndrzej Pietrasiewicz (struct usb_descriptor_header *) &fs_loop_sink_desc,
7500a2430fSAndrzej Pietrasiewicz (struct usb_descriptor_header *) &fs_loop_source_desc,
7600a2430fSAndrzej Pietrasiewicz NULL,
7700a2430fSAndrzej Pietrasiewicz };
7800a2430fSAndrzej Pietrasiewicz
7900a2430fSAndrzej Pietrasiewicz /* high speed support: */
8000a2430fSAndrzej Pietrasiewicz
8100a2430fSAndrzej Pietrasiewicz static struct usb_endpoint_descriptor hs_loop_source_desc = {
8200a2430fSAndrzej Pietrasiewicz .bLength = USB_DT_ENDPOINT_SIZE,
8300a2430fSAndrzej Pietrasiewicz .bDescriptorType = USB_DT_ENDPOINT,
8400a2430fSAndrzej Pietrasiewicz
8500a2430fSAndrzej Pietrasiewicz .bmAttributes = USB_ENDPOINT_XFER_BULK,
8600a2430fSAndrzej Pietrasiewicz .wMaxPacketSize = cpu_to_le16(512),
8700a2430fSAndrzej Pietrasiewicz };
8800a2430fSAndrzej Pietrasiewicz
8900a2430fSAndrzej Pietrasiewicz static struct usb_endpoint_descriptor hs_loop_sink_desc = {
9000a2430fSAndrzej Pietrasiewicz .bLength = USB_DT_ENDPOINT_SIZE,
9100a2430fSAndrzej Pietrasiewicz .bDescriptorType = USB_DT_ENDPOINT,
9200a2430fSAndrzej Pietrasiewicz
9300a2430fSAndrzej Pietrasiewicz .bmAttributes = USB_ENDPOINT_XFER_BULK,
9400a2430fSAndrzej Pietrasiewicz .wMaxPacketSize = cpu_to_le16(512),
9500a2430fSAndrzej Pietrasiewicz };
9600a2430fSAndrzej Pietrasiewicz
9700a2430fSAndrzej Pietrasiewicz static struct usb_descriptor_header *hs_loopback_descs[] = {
9800a2430fSAndrzej Pietrasiewicz (struct usb_descriptor_header *) &loopback_intf,
9900a2430fSAndrzej Pietrasiewicz (struct usb_descriptor_header *) &hs_loop_source_desc,
10000a2430fSAndrzej Pietrasiewicz (struct usb_descriptor_header *) &hs_loop_sink_desc,
10100a2430fSAndrzej Pietrasiewicz NULL,
10200a2430fSAndrzej Pietrasiewicz };
10300a2430fSAndrzej Pietrasiewicz
10400a2430fSAndrzej Pietrasiewicz /* super speed support: */
10500a2430fSAndrzej Pietrasiewicz
10600a2430fSAndrzej Pietrasiewicz static struct usb_endpoint_descriptor ss_loop_source_desc = {
10700a2430fSAndrzej Pietrasiewicz .bLength = USB_DT_ENDPOINT_SIZE,
10800a2430fSAndrzej Pietrasiewicz .bDescriptorType = USB_DT_ENDPOINT,
10900a2430fSAndrzej Pietrasiewicz
11000a2430fSAndrzej Pietrasiewicz .bmAttributes = USB_ENDPOINT_XFER_BULK,
11100a2430fSAndrzej Pietrasiewicz .wMaxPacketSize = cpu_to_le16(1024),
11200a2430fSAndrzej Pietrasiewicz };
11300a2430fSAndrzej Pietrasiewicz
11400a2430fSAndrzej Pietrasiewicz static struct usb_ss_ep_comp_descriptor ss_loop_source_comp_desc = {
11500a2430fSAndrzej Pietrasiewicz .bLength = USB_DT_SS_EP_COMP_SIZE,
11600a2430fSAndrzej Pietrasiewicz .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
11700a2430fSAndrzej Pietrasiewicz .bMaxBurst = 0,
11800a2430fSAndrzej Pietrasiewicz .bmAttributes = 0,
11900a2430fSAndrzej Pietrasiewicz .wBytesPerInterval = 0,
12000a2430fSAndrzej Pietrasiewicz };
12100a2430fSAndrzej Pietrasiewicz
12200a2430fSAndrzej Pietrasiewicz static struct usb_endpoint_descriptor ss_loop_sink_desc = {
12300a2430fSAndrzej Pietrasiewicz .bLength = USB_DT_ENDPOINT_SIZE,
12400a2430fSAndrzej Pietrasiewicz .bDescriptorType = USB_DT_ENDPOINT,
12500a2430fSAndrzej Pietrasiewicz
12600a2430fSAndrzej Pietrasiewicz .bmAttributes = USB_ENDPOINT_XFER_BULK,
12700a2430fSAndrzej Pietrasiewicz .wMaxPacketSize = cpu_to_le16(1024),
12800a2430fSAndrzej Pietrasiewicz };
12900a2430fSAndrzej Pietrasiewicz
13000a2430fSAndrzej Pietrasiewicz static struct usb_ss_ep_comp_descriptor ss_loop_sink_comp_desc = {
13100a2430fSAndrzej Pietrasiewicz .bLength = USB_DT_SS_EP_COMP_SIZE,
13200a2430fSAndrzej Pietrasiewicz .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
13300a2430fSAndrzej Pietrasiewicz .bMaxBurst = 0,
13400a2430fSAndrzej Pietrasiewicz .bmAttributes = 0,
13500a2430fSAndrzej Pietrasiewicz .wBytesPerInterval = 0,
13600a2430fSAndrzej Pietrasiewicz };
13700a2430fSAndrzej Pietrasiewicz
13800a2430fSAndrzej Pietrasiewicz static struct usb_descriptor_header *ss_loopback_descs[] = {
13900a2430fSAndrzej Pietrasiewicz (struct usb_descriptor_header *) &loopback_intf,
14000a2430fSAndrzej Pietrasiewicz (struct usb_descriptor_header *) &ss_loop_source_desc,
14100a2430fSAndrzej Pietrasiewicz (struct usb_descriptor_header *) &ss_loop_source_comp_desc,
14200a2430fSAndrzej Pietrasiewicz (struct usb_descriptor_header *) &ss_loop_sink_desc,
14300a2430fSAndrzej Pietrasiewicz (struct usb_descriptor_header *) &ss_loop_sink_comp_desc,
14400a2430fSAndrzej Pietrasiewicz NULL,
14500a2430fSAndrzej Pietrasiewicz };
14600a2430fSAndrzej Pietrasiewicz
14700a2430fSAndrzej Pietrasiewicz /* function-specific strings: */
14800a2430fSAndrzej Pietrasiewicz
14900a2430fSAndrzej Pietrasiewicz static struct usb_string strings_loopback[] = {
15000a2430fSAndrzej Pietrasiewicz [0].s = "loop input to output",
15100a2430fSAndrzej Pietrasiewicz { } /* end of list */
15200a2430fSAndrzej Pietrasiewicz };
15300a2430fSAndrzej Pietrasiewicz
15400a2430fSAndrzej Pietrasiewicz static struct usb_gadget_strings stringtab_loop = {
15500a2430fSAndrzej Pietrasiewicz .language = 0x0409, /* en-us */
15600a2430fSAndrzej Pietrasiewicz .strings = strings_loopback,
15700a2430fSAndrzej Pietrasiewicz };
15800a2430fSAndrzej Pietrasiewicz
15900a2430fSAndrzej Pietrasiewicz static struct usb_gadget_strings *loopback_strings[] = {
16000a2430fSAndrzej Pietrasiewicz &stringtab_loop,
16100a2430fSAndrzej Pietrasiewicz NULL,
16200a2430fSAndrzej Pietrasiewicz };
16300a2430fSAndrzej Pietrasiewicz
16400a2430fSAndrzej Pietrasiewicz /*-------------------------------------------------------------------------*/
16500a2430fSAndrzej Pietrasiewicz
loopback_bind(struct usb_configuration * c,struct usb_function * f)16600a2430fSAndrzej Pietrasiewicz static int loopback_bind(struct usb_configuration *c, struct usb_function *f)
16700a2430fSAndrzej Pietrasiewicz {
16800a2430fSAndrzej Pietrasiewicz struct usb_composite_dev *cdev = c->cdev;
16900a2430fSAndrzej Pietrasiewicz struct f_loopback *loop = func_to_loop(f);
17000a2430fSAndrzej Pietrasiewicz int id;
17100a2430fSAndrzej Pietrasiewicz int ret;
17200a2430fSAndrzej Pietrasiewicz
17300a2430fSAndrzej Pietrasiewicz /* allocate interface ID(s) */
17400a2430fSAndrzej Pietrasiewicz id = usb_interface_id(c, f);
17500a2430fSAndrzej Pietrasiewicz if (id < 0)
17600a2430fSAndrzej Pietrasiewicz return id;
17700a2430fSAndrzej Pietrasiewicz loopback_intf.bInterfaceNumber = id;
17800a2430fSAndrzej Pietrasiewicz
17900a2430fSAndrzej Pietrasiewicz id = usb_string_id(cdev);
18000a2430fSAndrzej Pietrasiewicz if (id < 0)
18100a2430fSAndrzej Pietrasiewicz return id;
18200a2430fSAndrzej Pietrasiewicz strings_loopback[0].id = id;
18300a2430fSAndrzej Pietrasiewicz loopback_intf.iInterface = id;
18400a2430fSAndrzej Pietrasiewicz
18500a2430fSAndrzej Pietrasiewicz /* allocate endpoints */
18600a2430fSAndrzej Pietrasiewicz
18700a2430fSAndrzej Pietrasiewicz loop->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_loop_source_desc);
18800a2430fSAndrzej Pietrasiewicz if (!loop->in_ep) {
18900a2430fSAndrzej Pietrasiewicz autoconf_fail:
19000a2430fSAndrzej Pietrasiewicz ERROR(cdev, "%s: can't autoconfigure on %s\n",
19100a2430fSAndrzej Pietrasiewicz f->name, cdev->gadget->name);
19200a2430fSAndrzej Pietrasiewicz return -ENODEV;
19300a2430fSAndrzej Pietrasiewicz }
19400a2430fSAndrzej Pietrasiewicz
19500a2430fSAndrzej Pietrasiewicz loop->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_loop_sink_desc);
19600a2430fSAndrzej Pietrasiewicz if (!loop->out_ep)
19700a2430fSAndrzej Pietrasiewicz goto autoconf_fail;
19800a2430fSAndrzej Pietrasiewicz
19900a2430fSAndrzej Pietrasiewicz /* support high speed hardware */
20000a2430fSAndrzej Pietrasiewicz hs_loop_source_desc.bEndpointAddress =
20100a2430fSAndrzej Pietrasiewicz fs_loop_source_desc.bEndpointAddress;
20200a2430fSAndrzej Pietrasiewicz hs_loop_sink_desc.bEndpointAddress = fs_loop_sink_desc.bEndpointAddress;
20300a2430fSAndrzej Pietrasiewicz
20400a2430fSAndrzej Pietrasiewicz /* support super speed hardware */
20500a2430fSAndrzej Pietrasiewicz ss_loop_source_desc.bEndpointAddress =
20600a2430fSAndrzej Pietrasiewicz fs_loop_source_desc.bEndpointAddress;
20700a2430fSAndrzej Pietrasiewicz ss_loop_sink_desc.bEndpointAddress = fs_loop_sink_desc.bEndpointAddress;
20800a2430fSAndrzej Pietrasiewicz
20900a2430fSAndrzej Pietrasiewicz ret = usb_assign_descriptors(f, fs_loopback_descs, hs_loopback_descs,
21090c4d057SMaciej Żenczykowski ss_loopback_descs, ss_loopback_descs);
21100a2430fSAndrzej Pietrasiewicz if (ret)
21200a2430fSAndrzej Pietrasiewicz return ret;
21300a2430fSAndrzej Pietrasiewicz
214333ab99eSLinyu Yuan DBG(cdev, "%s: IN/%s, OUT/%s\n",
21500a2430fSAndrzej Pietrasiewicz f->name, loop->in_ep->name, loop->out_ep->name);
21600a2430fSAndrzej Pietrasiewicz return 0;
21700a2430fSAndrzej Pietrasiewicz }
21800a2430fSAndrzej Pietrasiewicz
lb_free_func(struct usb_function * f)21900a2430fSAndrzej Pietrasiewicz static void lb_free_func(struct usb_function *f)
22000a2430fSAndrzej Pietrasiewicz {
22100a2430fSAndrzej Pietrasiewicz struct f_lb_opts *opts;
22200a2430fSAndrzej Pietrasiewicz
22300a2430fSAndrzej Pietrasiewicz opts = container_of(f->fi, struct f_lb_opts, func_inst);
22400a2430fSAndrzej Pietrasiewicz
22500a2430fSAndrzej Pietrasiewicz mutex_lock(&opts->lock);
22600a2430fSAndrzej Pietrasiewicz opts->refcnt--;
22700a2430fSAndrzej Pietrasiewicz mutex_unlock(&opts->lock);
22800a2430fSAndrzej Pietrasiewicz
22900a2430fSAndrzej Pietrasiewicz usb_free_all_descriptors(f);
23000a2430fSAndrzej Pietrasiewicz kfree(func_to_loop(f));
23100a2430fSAndrzej Pietrasiewicz }
23200a2430fSAndrzej Pietrasiewicz
loopback_complete(struct usb_ep * ep,struct usb_request * req)23300a2430fSAndrzej Pietrasiewicz static void loopback_complete(struct usb_ep *ep, struct usb_request *req)
23400a2430fSAndrzej Pietrasiewicz {
23500a2430fSAndrzej Pietrasiewicz struct f_loopback *loop = ep->driver_data;
23600a2430fSAndrzej Pietrasiewicz struct usb_composite_dev *cdev = loop->function.config->cdev;
23700a2430fSAndrzej Pietrasiewicz int status = req->status;
23800a2430fSAndrzej Pietrasiewicz
23900a2430fSAndrzej Pietrasiewicz switch (status) {
24000a2430fSAndrzej Pietrasiewicz case 0: /* normal completion? */
24100a2430fSAndrzej Pietrasiewicz if (ep == loop->out_ep) {
24291c42b0dSKrzysztof Opasiak /*
24391c42b0dSKrzysztof Opasiak * We received some data from the host so let's
24491c42b0dSKrzysztof Opasiak * queue it so host can read the from our in ep
24591c42b0dSKrzysztof Opasiak */
24691c42b0dSKrzysztof Opasiak struct usb_request *in_req = req->context;
24791c42b0dSKrzysztof Opasiak
24891c42b0dSKrzysztof Opasiak in_req->zero = (req->actual < req->length);
24991c42b0dSKrzysztof Opasiak in_req->length = req->actual;
25091c42b0dSKrzysztof Opasiak ep = loop->in_ep;
25191c42b0dSKrzysztof Opasiak req = in_req;
25291c42b0dSKrzysztof Opasiak } else {
25391c42b0dSKrzysztof Opasiak /*
25491c42b0dSKrzysztof Opasiak * We have just looped back a bunch of data
25591c42b0dSKrzysztof Opasiak * to host. Now let's wait for some more data.
25691c42b0dSKrzysztof Opasiak */
25791c42b0dSKrzysztof Opasiak req = req->context;
25891c42b0dSKrzysztof Opasiak ep = loop->out_ep;
25900a2430fSAndrzej Pietrasiewicz }
26000a2430fSAndrzej Pietrasiewicz
26191c42b0dSKrzysztof Opasiak /* queue the buffer back to host or for next bunch of data */
262e0857ce5SFelipe Balbi status = usb_ep_queue(ep, req, GFP_ATOMIC);
26391c42b0dSKrzysztof Opasiak if (status == 0) {
26400a2430fSAndrzej Pietrasiewicz return;
26591c42b0dSKrzysztof Opasiak } else {
26691c42b0dSKrzysztof Opasiak ERROR(cdev, "Unable to loop back buffer to %s: %d\n",
26791c42b0dSKrzysztof Opasiak ep->name, status);
26891c42b0dSKrzysztof Opasiak goto free_req;
26991c42b0dSKrzysztof Opasiak }
27000a2430fSAndrzej Pietrasiewicz
27100a2430fSAndrzej Pietrasiewicz /* "should never get here" */
27200a2430fSAndrzej Pietrasiewicz default:
27300a2430fSAndrzej Pietrasiewicz ERROR(cdev, "%s loop complete --> %d, %d/%d\n", ep->name,
27400a2430fSAndrzej Pietrasiewicz status, req->actual, req->length);
27593c747edSGustavo A. R. Silva fallthrough;
27600a2430fSAndrzej Pietrasiewicz
27700a2430fSAndrzej Pietrasiewicz /* NOTE: since this driver doesn't maintain an explicit record
27800a2430fSAndrzej Pietrasiewicz * of requests it submitted (just maintains qlen count), we
27900a2430fSAndrzej Pietrasiewicz * rely on the hardware driver to clean up on disconnect or
28000a2430fSAndrzej Pietrasiewicz * endpoint disable.
28100a2430fSAndrzej Pietrasiewicz */
28200a2430fSAndrzej Pietrasiewicz case -ECONNABORTED: /* hardware forced ep reset */
28300a2430fSAndrzej Pietrasiewicz case -ECONNRESET: /* request dequeued */
28400a2430fSAndrzej Pietrasiewicz case -ESHUTDOWN: /* disconnect from host */
28591c42b0dSKrzysztof Opasiak free_req:
28691c42b0dSKrzysztof Opasiak usb_ep_free_request(ep == loop->in_ep ?
28791c42b0dSKrzysztof Opasiak loop->out_ep : loop->in_ep,
28891c42b0dSKrzysztof Opasiak req->context);
28900a2430fSAndrzej Pietrasiewicz free_ep_req(ep, req);
29000a2430fSAndrzej Pietrasiewicz return;
29100a2430fSAndrzej Pietrasiewicz }
29200a2430fSAndrzej Pietrasiewicz }
29300a2430fSAndrzej Pietrasiewicz
disable_loopback(struct f_loopback * loop)29400a2430fSAndrzej Pietrasiewicz static void disable_loopback(struct f_loopback *loop)
29500a2430fSAndrzej Pietrasiewicz {
29600a2430fSAndrzej Pietrasiewicz struct usb_composite_dev *cdev;
29700a2430fSAndrzej Pietrasiewicz
29800a2430fSAndrzej Pietrasiewicz cdev = loop->function.config->cdev;
2992c247804SFelipe Balbi disable_endpoints(cdev, loop->in_ep, loop->out_ep, NULL, NULL);
30000a2430fSAndrzej Pietrasiewicz VDBG(cdev, "%s disabled\n", loop->function.name);
30100a2430fSAndrzej Pietrasiewicz }
30200a2430fSAndrzej Pietrasiewicz
lb_alloc_ep_req(struct usb_ep * ep,int len)30300a2430fSAndrzej Pietrasiewicz static inline struct usb_request *lb_alloc_ep_req(struct usb_ep *ep, int len)
30400a2430fSAndrzej Pietrasiewicz {
305aadbe812SFelipe F. Tonello return alloc_ep_req(ep, len);
30600a2430fSAndrzej Pietrasiewicz }
30700a2430fSAndrzej Pietrasiewicz
alloc_requests(struct usb_composite_dev * cdev,struct f_loopback * loop)30891c42b0dSKrzysztof Opasiak static int alloc_requests(struct usb_composite_dev *cdev,
30991c42b0dSKrzysztof Opasiak struct f_loopback *loop)
31000a2430fSAndrzej Pietrasiewicz {
31191c42b0dSKrzysztof Opasiak struct usb_request *in_req, *out_req;
31291c42b0dSKrzysztof Opasiak int i;
31391c42b0dSKrzysztof Opasiak int result = 0;
31400a2430fSAndrzej Pietrasiewicz
315e0857ce5SFelipe Balbi /*
316e0857ce5SFelipe Balbi * allocate a bunch of read buffers and queue them all at once.
31791c42b0dSKrzysztof Opasiak * we buffer at most 'qlen' transfers; We allocate buffers only
31891c42b0dSKrzysztof Opasiak * for out transfer and reuse them in IN transfers to implement
31991c42b0dSKrzysztof Opasiak * our loopback functionality
32000a2430fSAndrzej Pietrasiewicz */
3213e9d992fSKrzysztof Opasiak for (i = 0; i < loop->qlen && result == 0; i++) {
32291c42b0dSKrzysztof Opasiak result = -ENOMEM;
323e0857ce5SFelipe Balbi
3245e216d54SPeter Chen in_req = usb_ep_alloc_request(loop->in_ep, GFP_ATOMIC);
32591c42b0dSKrzysztof Opasiak if (!in_req)
32691c42b0dSKrzysztof Opasiak goto fail;
32791c42b0dSKrzysztof Opasiak
328aadbe812SFelipe F. Tonello out_req = lb_alloc_ep_req(loop->out_ep, loop->buflen);
32991c42b0dSKrzysztof Opasiak if (!out_req)
33091c42b0dSKrzysztof Opasiak goto fail_in;
33191c42b0dSKrzysztof Opasiak
33291c42b0dSKrzysztof Opasiak in_req->complete = loopback_complete;
33391c42b0dSKrzysztof Opasiak out_req->complete = loopback_complete;
33491c42b0dSKrzysztof Opasiak
33591c42b0dSKrzysztof Opasiak in_req->buf = out_req->buf;
33691c42b0dSKrzysztof Opasiak /* length will be set in complete routine */
33791c42b0dSKrzysztof Opasiak in_req->context = out_req;
33891c42b0dSKrzysztof Opasiak out_req->context = in_req;
33991c42b0dSKrzysztof Opasiak
34091c42b0dSKrzysztof Opasiak result = usb_ep_queue(loop->out_ep, out_req, GFP_ATOMIC);
341e0857ce5SFelipe Balbi if (result) {
34200a2430fSAndrzej Pietrasiewicz ERROR(cdev, "%s queue req --> %d\n",
34391c42b0dSKrzysztof Opasiak loop->out_ep->name, result);
34491c42b0dSKrzysztof Opasiak goto fail_out;
345e0857ce5SFelipe Balbi }
346e0857ce5SFelipe Balbi }
347e0857ce5SFelipe Balbi
348e0857ce5SFelipe Balbi return 0;
349e0857ce5SFelipe Balbi
35091c42b0dSKrzysztof Opasiak fail_out:
35191c42b0dSKrzysztof Opasiak free_ep_req(loop->out_ep, out_req);
35291c42b0dSKrzysztof Opasiak fail_in:
35391c42b0dSKrzysztof Opasiak usb_ep_free_request(loop->in_ep, in_req);
35491c42b0dSKrzysztof Opasiak fail:
35591c42b0dSKrzysztof Opasiak return result;
35691c42b0dSKrzysztof Opasiak }
357e0857ce5SFelipe Balbi
enable_endpoint(struct usb_composite_dev * cdev,struct f_loopback * loop,struct usb_ep * ep)35891c42b0dSKrzysztof Opasiak static int enable_endpoint(struct usb_composite_dev *cdev,
35991c42b0dSKrzysztof Opasiak struct f_loopback *loop, struct usb_ep *ep)
36091c42b0dSKrzysztof Opasiak {
36191c42b0dSKrzysztof Opasiak int result;
36291c42b0dSKrzysztof Opasiak
36391c42b0dSKrzysztof Opasiak result = config_ep_by_speed(cdev->gadget, &(loop->function), ep);
36491c42b0dSKrzysztof Opasiak if (result)
36591c42b0dSKrzysztof Opasiak goto out;
36691c42b0dSKrzysztof Opasiak
36791c42b0dSKrzysztof Opasiak result = usb_ep_enable(ep);
36891c42b0dSKrzysztof Opasiak if (result < 0)
36991c42b0dSKrzysztof Opasiak goto out;
37091c42b0dSKrzysztof Opasiak ep->driver_data = loop;
37191c42b0dSKrzysztof Opasiak result = 0;
37291c42b0dSKrzysztof Opasiak
37391c42b0dSKrzysztof Opasiak out:
374e0857ce5SFelipe Balbi return result;
37500a2430fSAndrzej Pietrasiewicz }
376e0857ce5SFelipe Balbi
377e0857ce5SFelipe Balbi static int
enable_loopback(struct usb_composite_dev * cdev,struct f_loopback * loop)378e0857ce5SFelipe Balbi enable_loopback(struct usb_composite_dev *cdev, struct f_loopback *loop)
379e0857ce5SFelipe Balbi {
380e0857ce5SFelipe Balbi int result = 0;
381e0857ce5SFelipe Balbi
382e0857ce5SFelipe Balbi result = enable_endpoint(cdev, loop, loop->in_ep);
383e0857ce5SFelipe Balbi if (result)
38491c42b0dSKrzysztof Opasiak goto out;
385e0857ce5SFelipe Balbi
386e0857ce5SFelipe Balbi result = enable_endpoint(cdev, loop, loop->out_ep);
387e0857ce5SFelipe Balbi if (result)
38891c42b0dSKrzysztof Opasiak goto disable_in;
38991c42b0dSKrzysztof Opasiak
39091c42b0dSKrzysztof Opasiak result = alloc_requests(cdev, loop);
39191c42b0dSKrzysztof Opasiak if (result)
39291c42b0dSKrzysztof Opasiak goto disable_out;
39300a2430fSAndrzej Pietrasiewicz
39400a2430fSAndrzej Pietrasiewicz DBG(cdev, "%s enabled\n", loop->function.name);
39591c42b0dSKrzysztof Opasiak return 0;
39691c42b0dSKrzysztof Opasiak
39791c42b0dSKrzysztof Opasiak disable_out:
39891c42b0dSKrzysztof Opasiak usb_ep_disable(loop->out_ep);
39991c42b0dSKrzysztof Opasiak disable_in:
40091c42b0dSKrzysztof Opasiak usb_ep_disable(loop->in_ep);
40191c42b0dSKrzysztof Opasiak out:
40200a2430fSAndrzej Pietrasiewicz return result;
40300a2430fSAndrzej Pietrasiewicz }
40400a2430fSAndrzej Pietrasiewicz
loopback_set_alt(struct usb_function * f,unsigned intf,unsigned alt)40500a2430fSAndrzej Pietrasiewicz static int loopback_set_alt(struct usb_function *f,
40600a2430fSAndrzej Pietrasiewicz unsigned intf, unsigned alt)
40700a2430fSAndrzej Pietrasiewicz {
40800a2430fSAndrzej Pietrasiewicz struct f_loopback *loop = func_to_loop(f);
40900a2430fSAndrzej Pietrasiewicz struct usb_composite_dev *cdev = f->config->cdev;
41000a2430fSAndrzej Pietrasiewicz
41100a2430fSAndrzej Pietrasiewicz /* we know alt is zero */
41200a2430fSAndrzej Pietrasiewicz disable_loopback(loop);
41300a2430fSAndrzej Pietrasiewicz return enable_loopback(cdev, loop);
41400a2430fSAndrzej Pietrasiewicz }
41500a2430fSAndrzej Pietrasiewicz
loopback_disable(struct usb_function * f)41600a2430fSAndrzej Pietrasiewicz static void loopback_disable(struct usb_function *f)
41700a2430fSAndrzej Pietrasiewicz {
41800a2430fSAndrzej Pietrasiewicz struct f_loopback *loop = func_to_loop(f);
41900a2430fSAndrzej Pietrasiewicz
42000a2430fSAndrzej Pietrasiewicz disable_loopback(loop);
42100a2430fSAndrzej Pietrasiewicz }
42200a2430fSAndrzej Pietrasiewicz
loopback_alloc(struct usb_function_instance * fi)42300a2430fSAndrzej Pietrasiewicz static struct usb_function *loopback_alloc(struct usb_function_instance *fi)
42400a2430fSAndrzej Pietrasiewicz {
42500a2430fSAndrzej Pietrasiewicz struct f_loopback *loop;
42600a2430fSAndrzej Pietrasiewicz struct f_lb_opts *lb_opts;
42700a2430fSAndrzej Pietrasiewicz
42800a2430fSAndrzej Pietrasiewicz loop = kzalloc(sizeof *loop, GFP_KERNEL);
42900a2430fSAndrzej Pietrasiewicz if (!loop)
43000a2430fSAndrzej Pietrasiewicz return ERR_PTR(-ENOMEM);
43100a2430fSAndrzej Pietrasiewicz
43200a2430fSAndrzej Pietrasiewicz lb_opts = container_of(fi, struct f_lb_opts, func_inst);
43300a2430fSAndrzej Pietrasiewicz
43400a2430fSAndrzej Pietrasiewicz mutex_lock(&lb_opts->lock);
43500a2430fSAndrzej Pietrasiewicz lb_opts->refcnt++;
43600a2430fSAndrzej Pietrasiewicz mutex_unlock(&lb_opts->lock);
43700a2430fSAndrzej Pietrasiewicz
4383e9d992fSKrzysztof Opasiak loop->buflen = lb_opts->bulk_buflen;
4393e9d992fSKrzysztof Opasiak loop->qlen = lb_opts->qlen;
4403e9d992fSKrzysztof Opasiak if (!loop->qlen)
4413e9d992fSKrzysztof Opasiak loop->qlen = 32;
44200a2430fSAndrzej Pietrasiewicz
44300a2430fSAndrzej Pietrasiewicz loop->function.name = "loopback";
44400a2430fSAndrzej Pietrasiewicz loop->function.bind = loopback_bind;
44500a2430fSAndrzej Pietrasiewicz loop->function.set_alt = loopback_set_alt;
44600a2430fSAndrzej Pietrasiewicz loop->function.disable = loopback_disable;
44700a2430fSAndrzej Pietrasiewicz loop->function.strings = loopback_strings;
44800a2430fSAndrzej Pietrasiewicz
44900a2430fSAndrzej Pietrasiewicz loop->function.free_func = lb_free_func;
45000a2430fSAndrzej Pietrasiewicz
45100a2430fSAndrzej Pietrasiewicz return &loop->function;
45200a2430fSAndrzej Pietrasiewicz }
45300a2430fSAndrzej Pietrasiewicz
to_f_lb_opts(struct config_item * item)45400a2430fSAndrzej Pietrasiewicz static inline struct f_lb_opts *to_f_lb_opts(struct config_item *item)
45500a2430fSAndrzej Pietrasiewicz {
45600a2430fSAndrzej Pietrasiewicz return container_of(to_config_group(item), struct f_lb_opts,
45700a2430fSAndrzej Pietrasiewicz func_inst.group);
45800a2430fSAndrzej Pietrasiewicz }
45900a2430fSAndrzej Pietrasiewicz
lb_attr_release(struct config_item * item)46000a2430fSAndrzej Pietrasiewicz static void lb_attr_release(struct config_item *item)
46100a2430fSAndrzej Pietrasiewicz {
46200a2430fSAndrzej Pietrasiewicz struct f_lb_opts *lb_opts = to_f_lb_opts(item);
46300a2430fSAndrzej Pietrasiewicz
46400a2430fSAndrzej Pietrasiewicz usb_put_function_instance(&lb_opts->func_inst);
46500a2430fSAndrzej Pietrasiewicz }
46600a2430fSAndrzej Pietrasiewicz
46700a2430fSAndrzej Pietrasiewicz static struct configfs_item_operations lb_item_ops = {
46800a2430fSAndrzej Pietrasiewicz .release = lb_attr_release,
46900a2430fSAndrzej Pietrasiewicz };
47000a2430fSAndrzej Pietrasiewicz
f_lb_opts_qlen_show(struct config_item * item,char * page)47175ab2256SChristoph Hellwig static ssize_t f_lb_opts_qlen_show(struct config_item *item, char *page)
47200a2430fSAndrzej Pietrasiewicz {
47375ab2256SChristoph Hellwig struct f_lb_opts *opts = to_f_lb_opts(item);
47400a2430fSAndrzej Pietrasiewicz int result;
47500a2430fSAndrzej Pietrasiewicz
47600a2430fSAndrzej Pietrasiewicz mutex_lock(&opts->lock);
477902d03c7SKrzysztof Opasiak result = sprintf(page, "%d\n", opts->qlen);
47800a2430fSAndrzej Pietrasiewicz mutex_unlock(&opts->lock);
47900a2430fSAndrzej Pietrasiewicz
48000a2430fSAndrzej Pietrasiewicz return result;
48100a2430fSAndrzej Pietrasiewicz }
48200a2430fSAndrzej Pietrasiewicz
f_lb_opts_qlen_store(struct config_item * item,const char * page,size_t len)48375ab2256SChristoph Hellwig static ssize_t f_lb_opts_qlen_store(struct config_item *item,
48400a2430fSAndrzej Pietrasiewicz const char *page, size_t len)
48500a2430fSAndrzej Pietrasiewicz {
48675ab2256SChristoph Hellwig struct f_lb_opts *opts = to_f_lb_opts(item);
48700a2430fSAndrzej Pietrasiewicz int ret;
48800a2430fSAndrzej Pietrasiewicz u32 num;
48900a2430fSAndrzej Pietrasiewicz
49000a2430fSAndrzej Pietrasiewicz mutex_lock(&opts->lock);
49100a2430fSAndrzej Pietrasiewicz if (opts->refcnt) {
49200a2430fSAndrzej Pietrasiewicz ret = -EBUSY;
49300a2430fSAndrzej Pietrasiewicz goto end;
49400a2430fSAndrzej Pietrasiewicz }
49500a2430fSAndrzej Pietrasiewicz
49600a2430fSAndrzej Pietrasiewicz ret = kstrtou32(page, 0, &num);
49700a2430fSAndrzej Pietrasiewicz if (ret)
49800a2430fSAndrzej Pietrasiewicz goto end;
49900a2430fSAndrzej Pietrasiewicz
50000a2430fSAndrzej Pietrasiewicz opts->qlen = num;
50100a2430fSAndrzej Pietrasiewicz ret = len;
50200a2430fSAndrzej Pietrasiewicz end:
50300a2430fSAndrzej Pietrasiewicz mutex_unlock(&opts->lock);
50400a2430fSAndrzej Pietrasiewicz return ret;
50500a2430fSAndrzej Pietrasiewicz }
50600a2430fSAndrzej Pietrasiewicz
50775ab2256SChristoph Hellwig CONFIGFS_ATTR(f_lb_opts_, qlen);
50800a2430fSAndrzej Pietrasiewicz
f_lb_opts_bulk_buflen_show(struct config_item * item,char * page)50975ab2256SChristoph Hellwig static ssize_t f_lb_opts_bulk_buflen_show(struct config_item *item, char *page)
51000a2430fSAndrzej Pietrasiewicz {
51175ab2256SChristoph Hellwig struct f_lb_opts *opts = to_f_lb_opts(item);
51200a2430fSAndrzej Pietrasiewicz int result;
51300a2430fSAndrzej Pietrasiewicz
51400a2430fSAndrzej Pietrasiewicz mutex_lock(&opts->lock);
515902d03c7SKrzysztof Opasiak result = sprintf(page, "%d\n", opts->bulk_buflen);
51600a2430fSAndrzej Pietrasiewicz mutex_unlock(&opts->lock);
51700a2430fSAndrzej Pietrasiewicz
51800a2430fSAndrzej Pietrasiewicz return result;
51900a2430fSAndrzej Pietrasiewicz }
52000a2430fSAndrzej Pietrasiewicz
f_lb_opts_bulk_buflen_store(struct config_item * item,const char * page,size_t len)52175ab2256SChristoph Hellwig static ssize_t f_lb_opts_bulk_buflen_store(struct config_item *item,
52200a2430fSAndrzej Pietrasiewicz const char *page, size_t len)
52300a2430fSAndrzej Pietrasiewicz {
52475ab2256SChristoph Hellwig struct f_lb_opts *opts = to_f_lb_opts(item);
52500a2430fSAndrzej Pietrasiewicz int ret;
52600a2430fSAndrzej Pietrasiewicz u32 num;
52700a2430fSAndrzej Pietrasiewicz
52800a2430fSAndrzej Pietrasiewicz mutex_lock(&opts->lock);
52900a2430fSAndrzej Pietrasiewicz if (opts->refcnt) {
53000a2430fSAndrzej Pietrasiewicz ret = -EBUSY;
53100a2430fSAndrzej Pietrasiewicz goto end;
53200a2430fSAndrzej Pietrasiewicz }
53300a2430fSAndrzej Pietrasiewicz
53400a2430fSAndrzej Pietrasiewicz ret = kstrtou32(page, 0, &num);
53500a2430fSAndrzej Pietrasiewicz if (ret)
53600a2430fSAndrzej Pietrasiewicz goto end;
53700a2430fSAndrzej Pietrasiewicz
53800a2430fSAndrzej Pietrasiewicz opts->bulk_buflen = num;
53900a2430fSAndrzej Pietrasiewicz ret = len;
54000a2430fSAndrzej Pietrasiewicz end:
54100a2430fSAndrzej Pietrasiewicz mutex_unlock(&opts->lock);
54200a2430fSAndrzej Pietrasiewicz return ret;
54300a2430fSAndrzej Pietrasiewicz }
54400a2430fSAndrzej Pietrasiewicz
54575ab2256SChristoph Hellwig CONFIGFS_ATTR(f_lb_opts_, bulk_buflen);
54600a2430fSAndrzej Pietrasiewicz
54700a2430fSAndrzej Pietrasiewicz static struct configfs_attribute *lb_attrs[] = {
54875ab2256SChristoph Hellwig &f_lb_opts_attr_qlen,
54975ab2256SChristoph Hellwig &f_lb_opts_attr_bulk_buflen,
55000a2430fSAndrzej Pietrasiewicz NULL,
55100a2430fSAndrzej Pietrasiewicz };
55200a2430fSAndrzej Pietrasiewicz
55397363902SBhumika Goyal static const struct config_item_type lb_func_type = {
55400a2430fSAndrzej Pietrasiewicz .ct_item_ops = &lb_item_ops,
55500a2430fSAndrzej Pietrasiewicz .ct_attrs = lb_attrs,
55600a2430fSAndrzej Pietrasiewicz .ct_owner = THIS_MODULE,
55700a2430fSAndrzej Pietrasiewicz };
55800a2430fSAndrzej Pietrasiewicz
lb_free_instance(struct usb_function_instance * fi)55900a2430fSAndrzej Pietrasiewicz static void lb_free_instance(struct usb_function_instance *fi)
56000a2430fSAndrzej Pietrasiewicz {
56100a2430fSAndrzej Pietrasiewicz struct f_lb_opts *lb_opts;
56200a2430fSAndrzej Pietrasiewicz
56300a2430fSAndrzej Pietrasiewicz lb_opts = container_of(fi, struct f_lb_opts, func_inst);
56400a2430fSAndrzej Pietrasiewicz kfree(lb_opts);
56500a2430fSAndrzej Pietrasiewicz }
56600a2430fSAndrzej Pietrasiewicz
loopback_alloc_instance(void)56700a2430fSAndrzej Pietrasiewicz static struct usb_function_instance *loopback_alloc_instance(void)
56800a2430fSAndrzej Pietrasiewicz {
56900a2430fSAndrzej Pietrasiewicz struct f_lb_opts *lb_opts;
57000a2430fSAndrzej Pietrasiewicz
57100a2430fSAndrzej Pietrasiewicz lb_opts = kzalloc(sizeof(*lb_opts), GFP_KERNEL);
57200a2430fSAndrzej Pietrasiewicz if (!lb_opts)
57300a2430fSAndrzej Pietrasiewicz return ERR_PTR(-ENOMEM);
57400a2430fSAndrzej Pietrasiewicz mutex_init(&lb_opts->lock);
57500a2430fSAndrzej Pietrasiewicz lb_opts->func_inst.free_func_inst = lb_free_instance;
57600a2430fSAndrzej Pietrasiewicz lb_opts->bulk_buflen = GZERO_BULK_BUFLEN;
57700a2430fSAndrzej Pietrasiewicz lb_opts->qlen = GZERO_QLEN;
57800a2430fSAndrzej Pietrasiewicz
57900a2430fSAndrzej Pietrasiewicz config_group_init_type_name(&lb_opts->func_inst.group, "",
58000a2430fSAndrzej Pietrasiewicz &lb_func_type);
58100a2430fSAndrzej Pietrasiewicz
58200a2430fSAndrzej Pietrasiewicz return &lb_opts->func_inst;
58300a2430fSAndrzej Pietrasiewicz }
58400a2430fSAndrzej Pietrasiewicz DECLARE_USB_FUNCTION(Loopback, loopback_alloc_instance, loopback_alloc);
58500a2430fSAndrzej Pietrasiewicz
lb_modinit(void)58600a2430fSAndrzej Pietrasiewicz int __init lb_modinit(void)
58700a2430fSAndrzej Pietrasiewicz {
5885387c920SColin Ian King return usb_function_register(&Loopbackusb_func);
58900a2430fSAndrzej Pietrasiewicz }
5905387c920SColin Ian King
lb_modexit(void)59100a2430fSAndrzej Pietrasiewicz void __exit lb_modexit(void)
59200a2430fSAndrzej Pietrasiewicz {
59300a2430fSAndrzej Pietrasiewicz usb_function_unregister(&Loopbackusb_func);
59400a2430fSAndrzej Pietrasiewicz }
59500a2430fSAndrzej Pietrasiewicz
5961cb9ba5eSJeff Johnson MODULE_DESCRIPTION("USB peripheral loopback configuration driver");
59700a2430fSAndrzej Pietrasiewicz MODULE_LICENSE("GPL");
598