2 * zero.c -- Gadget Zero, for USB development
4 * Copyright (C) 2003-2008 David Brownell
5 * Copyright (C) 2008 by Nokia Corporation
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
14 * Gadget Zero only needs two bulk endpoints, and is an example of how you
15 * can write a hardware-agnostic gadget driver running inside a USB device.
16 * Some hardware details are visible, but don't affect most of the driver.
18 * Use it with the Linux host/master side "usbtest" driver to get a basic
19 * functional test of your device-side usb stack, or with "usb-skeleton".
21 * It supports two similar configurations. One sinks whatever the usb host
22 * writes, and in return sources zeroes. The other loops whatever the host
23 * writes back, so the host can read it.
25 * Many drivers will only have one configuration, letting them be much
26 * simpler if they also don't support high speed operation (like this
29 * Why is *this* driver using two configurations, rather than setting up
30 * two interfaces with different functions? To help verify that multiple
31 * configuration infrastucture is working correctly; also, so that it can
32 * work with low capability USB controllers without four bulk endpoints.
36 * driver assumes self-powered hardware, and
37 * has no way for users to trigger remote wakeup.
40 /* #define VERBOSE_DEBUG */
42 #include <linux/kernel.h>
43 #include <linux/slab.h>
44 #include <linux/device.h>
45 #include <linux/module.h>
46 #include <linux/err.h>
47 #include <linux/usb/composite.h>
50 /*-------------------------------------------------------------------------*/
51 USB_GADGET_COMPOSITE_OPTIONS();
53 #define DRIVER_VERSION "Cinco de Mayo 2008"
55 static const char longname[] = "Gadget Zero";
58 * Normally the "loopback" configuration is second (index 1) so
59 * it's not the default. Here's where to change that order, to
60 * work better with hosts where config changes are problematic or
61 * controllers (like original superh) that only support one config.
63 static bool loopdefault = 0;
64 module_param(loopdefault, bool, S_IRUGO|S_IWUSR);
66 static struct usb_zero_options gzero_options = {
67 .isoc_interval = GZERO_ISOC_INTERVAL,
68 .isoc_maxpacket = GZERO_ISOC_MAXPACKET,
69 .bulk_buflen = GZERO_BULK_BUFLEN,
73 /*-------------------------------------------------------------------------*/
75 /* Thanks to NetChip Technologies for donating this product ID.
77 * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
78 * Instead: allocate your own, using normal USB-IF procedures.
80 #ifndef CONFIG_USB_ZERO_HNPTEST
81 #define DRIVER_VENDOR_NUM 0x0525 /* NetChip */
82 #define DRIVER_PRODUCT_NUM 0xa4a0 /* Linux-USB "Gadget Zero" */
83 #define DEFAULT_AUTORESUME 0
85 #define DRIVER_VENDOR_NUM 0x1a0a /* OTG test device IDs */
86 #define DRIVER_PRODUCT_NUM 0xbadd
87 #define DEFAULT_AUTORESUME 5
90 /* If the optional "autoresume" mode is enabled, it provides good
91 * functional coverage for the "USBCV" test harness from USB-IF.
92 * It's always set if OTG mode is enabled.
94 static unsigned autoresume = DEFAULT_AUTORESUME;
95 module_param(autoresume, uint, S_IRUGO);
96 MODULE_PARM_DESC(autoresume, "zero, or seconds before remote wakeup");
98 /* Maximum Autoresume time */
99 static unsigned max_autoresume;
100 module_param(max_autoresume, uint, S_IRUGO);
101 MODULE_PARM_DESC(max_autoresume, "maximum seconds before remote wakeup");
103 /* Interval between two remote wakeups */
104 static unsigned autoresume_interval_ms;
105 module_param(autoresume_interval_ms, uint, S_IRUGO);
106 MODULE_PARM_DESC(autoresume_interval_ms,
107 "milliseconds to increase successive wakeup delays");
109 static unsigned autoresume_step_ms;
110 /*-------------------------------------------------------------------------*/
112 static struct usb_device_descriptor device_desc = {
113 .bLength = sizeof device_desc,
114 .bDescriptorType = USB_DT_DEVICE,
116 .bcdUSB = cpu_to_le16(0x0200),
117 .bDeviceClass = USB_CLASS_VENDOR_SPEC,
119 .idVendor = cpu_to_le16(DRIVER_VENDOR_NUM),
120 .idProduct = cpu_to_le16(DRIVER_PRODUCT_NUM),
121 .bNumConfigurations = 2,
124 #ifdef CONFIG_USB_OTG
125 static struct usb_otg_descriptor otg_descriptor = {
126 .bLength = sizeof otg_descriptor,
127 .bDescriptorType = USB_DT_OTG,
129 /* REVISIT SRP-only hardware is possible, although
130 * it would not be called "OTG" ...
132 .bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
135 static const struct usb_descriptor_header *otg_desc[] = {
136 (struct usb_descriptor_header *) &otg_descriptor,
140 #define otg_desc NULL
143 /* string IDs are assigned dynamically */
144 /* default serial number takes at least two packets */
145 static char serial[] = "0123456789.0123456789.0123456789";
147 #define USB_GZERO_SS_DESC (USB_GADGET_FIRST_AVAIL_IDX + 0)
148 #define USB_GZERO_LB_DESC (USB_GADGET_FIRST_AVAIL_IDX + 1)
150 static struct usb_string strings_dev[] = {
151 [USB_GADGET_MANUFACTURER_IDX].s = "",
152 [USB_GADGET_PRODUCT_IDX].s = longname,
153 [USB_GADGET_SERIAL_IDX].s = serial,
154 [USB_GZERO_SS_DESC].s = "source and sink data",
155 [USB_GZERO_LB_DESC].s = "loop input to output",
156 { } /* end of list */
159 static struct usb_gadget_strings stringtab_dev = {
160 .language = 0x0409, /* en-us */
161 .strings = strings_dev,
164 static struct usb_gadget_strings *dev_strings[] = {
169 /*-------------------------------------------------------------------------*/
171 static struct timer_list autoresume_timer;
173 static void zero_autoresume(unsigned long _c)
175 struct usb_composite_dev *cdev = (void *)_c;
176 struct usb_gadget *g = cdev->gadget;
178 /* unconfigured devices can't issue wakeups */
182 /* Normally the host would be woken up for something
183 * more significant than just a timer firing; likely
184 * because of some direct user request.
186 if (g->speed != USB_SPEED_UNKNOWN) {
187 int status = usb_gadget_wakeup(g);
188 INFO(cdev, "%s --> %d\n", __func__, status);
192 static void zero_suspend(struct usb_composite_dev *cdev)
194 if (cdev->gadget->speed == USB_SPEED_UNKNOWN)
198 if (max_autoresume &&
199 (autoresume_step_ms > max_autoresume * 1000))
200 autoresume_step_ms = autoresume * 1000;
202 mod_timer(&autoresume_timer, jiffies +
203 msecs_to_jiffies(autoresume_step_ms));
204 DBG(cdev, "suspend, wakeup in %d milliseconds\n",
207 autoresume_step_ms += autoresume_interval_ms;
209 DBG(cdev, "%s\n", __func__);
212 static void zero_resume(struct usb_composite_dev *cdev)
214 DBG(cdev, "%s\n", __func__);
215 del_timer(&autoresume_timer);
218 /*-------------------------------------------------------------------------*/
220 static struct usb_configuration loopback_driver = {
222 .bConfigurationValue = 2,
223 .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
224 /* .iConfiguration = DYNAMIC */
227 static struct usb_function *func_ss;
228 static struct usb_function_instance *func_inst_ss;
230 static int ss_config_setup(struct usb_configuration *c,
231 const struct usb_ctrlrequest *ctrl)
233 switch (ctrl->bRequest) {
236 return func_ss->setup(func_ss, ctrl);
242 static struct usb_configuration sourcesink_driver = {
243 .label = "source/sink",
244 .setup = ss_config_setup,
245 .bConfigurationValue = 3,
246 .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
247 /* .iConfiguration = DYNAMIC */
250 module_param_named(buflen, gzero_options.bulk_buflen, uint, 0);
251 module_param_named(pattern, gzero_options.pattern, uint, S_IRUGO|S_IWUSR);
252 MODULE_PARM_DESC(pattern, "0 = all zeroes, 1 = mod63, 2 = none");
254 module_param_named(isoc_interval, gzero_options.isoc_interval, uint,
256 MODULE_PARM_DESC(isoc_interval, "1 - 16");
258 module_param_named(isoc_maxpacket, gzero_options.isoc_maxpacket, uint,
260 MODULE_PARM_DESC(isoc_maxpacket, "0 - 1023 (fs), 0 - 1024 (hs/ss)");
262 module_param_named(isoc_mult, gzero_options.isoc_mult, uint, S_IRUGO|S_IWUSR);
263 MODULE_PARM_DESC(isoc_mult, "0 - 2 (hs/ss only)");
265 module_param_named(isoc_maxburst, gzero_options.isoc_maxburst, uint,
267 MODULE_PARM_DESC(isoc_maxburst, "0 - 15 (ss only)");
269 static struct usb_function *func_lb;
270 static struct usb_function_instance *func_inst_lb;
272 module_param_named(qlen, gzero_options.qlen, uint, S_IRUGO|S_IWUSR);
273 MODULE_PARM_DESC(qlen, "depth of loopback queue");
275 static int __init zero_bind(struct usb_composite_dev *cdev)
277 struct f_ss_opts *ss_opts;
278 struct f_lb_opts *lb_opts;
281 /* Allocate string descriptor numbers ... note that string
282 * contents can be overridden by the composite_dev glue.
284 status = usb_string_ids_tab(cdev, strings_dev);
288 device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
289 device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
290 device_desc.iSerialNumber = strings_dev[USB_GADGET_SERIAL_IDX].id;
292 setup_timer(&autoresume_timer, zero_autoresume, (unsigned long) cdev);
294 func_inst_ss = usb_get_function_instance("SourceSink");
295 if (IS_ERR(func_inst_ss))
296 return PTR_ERR(func_inst_ss);
298 ss_opts = container_of(func_inst_ss, struct f_ss_opts, func_inst);
299 ss_opts->pattern = gzero_options.pattern;
300 ss_opts->isoc_interval = gzero_options.isoc_interval;
301 ss_opts->isoc_maxpacket = gzero_options.isoc_maxpacket;
302 ss_opts->isoc_mult = gzero_options.isoc_mult;
303 ss_opts->isoc_maxburst = gzero_options.isoc_maxpacket;
304 ss_opts->bulk_buflen = gzero_options.bulk_buflen;
306 func_ss = usb_get_function(func_inst_ss);
307 if (IS_ERR(func_ss)) {
308 status = PTR_ERR(func_ss);
309 goto err_put_func_inst_ss;
312 func_inst_lb = usb_get_function_instance("Loopback");
313 if (IS_ERR(func_inst_lb)) {
314 status = PTR_ERR(func_inst_lb);
315 goto err_put_func_ss;
318 lb_opts = container_of(func_inst_lb, struct f_lb_opts, func_inst);
319 lb_opts->bulk_buflen = gzero_options.bulk_buflen;
320 lb_opts->qlen = gzero_options.qlen;
322 func_lb = usb_get_function(func_inst_lb);
323 if (IS_ERR(func_lb)) {
324 status = PTR_ERR(func_lb);
325 goto err_put_func_inst_lb;
328 sourcesink_driver.iConfiguration = strings_dev[USB_GZERO_SS_DESC].id;
329 loopback_driver.iConfiguration = strings_dev[USB_GZERO_LB_DESC].id;
331 /* support autoresume for remote wakeup testing */
332 sourcesink_driver.bmAttributes &= ~USB_CONFIG_ATT_WAKEUP;
333 loopback_driver.bmAttributes &= ~USB_CONFIG_ATT_WAKEUP;
334 sourcesink_driver.descriptors = NULL;
335 loopback_driver.descriptors = NULL;
337 sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
338 loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
339 autoresume_step_ms = autoresume * 1000;
342 /* support OTG systems */
343 if (gadget_is_otg(cdev->gadget)) {
344 sourcesink_driver.descriptors = otg_desc;
345 sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
346 loopback_driver.descriptors = otg_desc;
347 loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
350 /* Register primary, then secondary configuration. Note that
351 * SH3 only allows one config...
354 usb_add_config_only(cdev, &loopback_driver);
355 usb_add_config_only(cdev, &sourcesink_driver);
357 usb_add_config_only(cdev, &sourcesink_driver);
358 usb_add_config_only(cdev, &loopback_driver);
360 status = usb_add_function(&sourcesink_driver, func_ss);
364 usb_ep_autoconfig_reset(cdev->gadget);
365 status = usb_add_function(&loopback_driver, func_lb);
369 usb_ep_autoconfig_reset(cdev->gadget);
370 usb_composite_overwrite_options(cdev, &coverwrite);
372 INFO(cdev, "%s, version: " DRIVER_VERSION "\n", longname);
377 usb_put_function(func_lb);
379 err_put_func_inst_lb:
380 usb_put_function_instance(func_inst_lb);
383 usb_put_function(func_ss);
385 err_put_func_inst_ss:
386 usb_put_function_instance(func_inst_ss);
391 static int zero_unbind(struct usb_composite_dev *cdev)
393 del_timer_sync(&autoresume_timer);
394 if (!IS_ERR_OR_NULL(func_ss))
395 usb_put_function(func_ss);
396 usb_put_function_instance(func_inst_ss);
397 if (!IS_ERR_OR_NULL(func_lb))
398 usb_put_function(func_lb);
399 usb_put_function_instance(func_inst_lb);
403 static __refdata struct usb_composite_driver zero_driver = {
406 .strings = dev_strings,
407 .max_speed = USB_SPEED_SUPER,
409 .unbind = zero_unbind,
410 .suspend = zero_suspend,
411 .resume = zero_resume,
414 MODULE_AUTHOR("David Brownell");
415 MODULE_LICENSE("GPL");
417 static int __init init(void)
419 return usb_composite_probe(&zero_driver);
423 static void __exit cleanup(void)
425 usb_composite_unregister(&zero_driver);
427 module_exit(cleanup);