Merge Linus' tree to be be to apply submitted patches to newer code than
[cascardo/linux.git] / drivers / usb / gadget / legacy / zero.c
1 /*
2  * zero.c -- Gadget Zero, for USB development
3  *
4  * Copyright (C) 2003-2008 David Brownell
5  * Copyright (C) 2008 by Nokia Corporation
6  *
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.
11  */
12
13 /*
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.
17  *
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".
20  *
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.
24  *
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
27  * driver does).
28  *
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 infrastructure is working correctly; also, so that it can
32  * work with low capability USB controllers without four bulk endpoints.
33  */
34
35 /*
36  * driver assumes self-powered hardware, and
37  * has no way for users to trigger remote wakeup.
38  */
39
40 /* #define VERBOSE_DEBUG */
41
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>
48
49 #include "g_zero.h"
50 /*-------------------------------------------------------------------------*/
51 USB_GADGET_COMPOSITE_OPTIONS();
52
53 #define DRIVER_VERSION          "Cinco de Mayo 2008"
54
55 static const char longname[] = "Gadget Zero";
56
57 /*
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.
62  */
63 static bool loopdefault = 0;
64 module_param(loopdefault, bool, S_IRUGO|S_IWUSR);
65
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,
70         .qlen = GZERO_QLEN,
71         .int_interval = GZERO_INT_INTERVAL,
72         .int_maxpacket = GZERO_INT_MAXPACKET,
73 };
74
75 /*-------------------------------------------------------------------------*/
76
77 /* Thanks to NetChip Technologies for donating this product ID.
78  *
79  * DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
80  * Instead:  allocate your own, using normal USB-IF procedures.
81  */
82 #ifndef CONFIG_USB_ZERO_HNPTEST
83 #define DRIVER_VENDOR_NUM       0x0525          /* NetChip */
84 #define DRIVER_PRODUCT_NUM      0xa4a0          /* Linux-USB "Gadget Zero" */
85 #define DEFAULT_AUTORESUME      0
86 #else
87 #define DRIVER_VENDOR_NUM       0x1a0a          /* OTG test device IDs */
88 #define DRIVER_PRODUCT_NUM      0xbadd
89 #define DEFAULT_AUTORESUME      5
90 #endif
91
92 /* If the optional "autoresume" mode is enabled, it provides good
93  * functional coverage for the "USBCV" test harness from USB-IF.
94  * It's always set if OTG mode is enabled.
95  */
96 static unsigned autoresume = DEFAULT_AUTORESUME;
97 module_param(autoresume, uint, S_IRUGO);
98 MODULE_PARM_DESC(autoresume, "zero, or seconds before remote wakeup");
99
100 /* Maximum Autoresume time */
101 static unsigned max_autoresume;
102 module_param(max_autoresume, uint, S_IRUGO);
103 MODULE_PARM_DESC(max_autoresume, "maximum seconds before remote wakeup");
104
105 /* Interval between two remote wakeups */
106 static unsigned autoresume_interval_ms;
107 module_param(autoresume_interval_ms, uint, S_IRUGO);
108 MODULE_PARM_DESC(autoresume_interval_ms,
109                 "milliseconds to increase successive wakeup delays");
110
111 static unsigned autoresume_step_ms;
112 /*-------------------------------------------------------------------------*/
113
114 static struct usb_device_descriptor device_desc = {
115         .bLength =              sizeof device_desc,
116         .bDescriptorType =      USB_DT_DEVICE,
117
118         .bcdUSB =               cpu_to_le16(0x0200),
119         .bDeviceClass =         USB_CLASS_VENDOR_SPEC,
120
121         .idVendor =             cpu_to_le16(DRIVER_VENDOR_NUM),
122         .idProduct =            cpu_to_le16(DRIVER_PRODUCT_NUM),
123         .bNumConfigurations =   2,
124 };
125
126 #ifdef CONFIG_USB_OTG
127 static struct usb_otg_descriptor otg_descriptor = {
128         .bLength =              sizeof otg_descriptor,
129         .bDescriptorType =      USB_DT_OTG,
130
131         /* REVISIT SRP-only hardware is possible, although
132          * it would not be called "OTG" ...
133          */
134         .bmAttributes =         USB_OTG_SRP | USB_OTG_HNP,
135 };
136
137 static const struct usb_descriptor_header *otg_desc[] = {
138         (struct usb_descriptor_header *) &otg_descriptor,
139         NULL,
140 };
141 #else
142 #define otg_desc        NULL
143 #endif
144
145 /* string IDs are assigned dynamically */
146 /* default serial number takes at least two packets */
147 static char serial[] = "0123456789.0123456789.0123456789";
148
149 #define USB_GZERO_SS_DESC       (USB_GADGET_FIRST_AVAIL_IDX + 0)
150 #define USB_GZERO_LB_DESC       (USB_GADGET_FIRST_AVAIL_IDX + 1)
151
152 static struct usb_string strings_dev[] = {
153         [USB_GADGET_MANUFACTURER_IDX].s = "",
154         [USB_GADGET_PRODUCT_IDX].s = longname,
155         [USB_GADGET_SERIAL_IDX].s = serial,
156         [USB_GZERO_SS_DESC].s   = "source and sink data",
157         [USB_GZERO_LB_DESC].s   = "loop input to output",
158         {  }                    /* end of list */
159 };
160
161 static struct usb_gadget_strings stringtab_dev = {
162         .language       = 0x0409,       /* en-us */
163         .strings        = strings_dev,
164 };
165
166 static struct usb_gadget_strings *dev_strings[] = {
167         &stringtab_dev,
168         NULL,
169 };
170
171 /*-------------------------------------------------------------------------*/
172
173 static struct timer_list        autoresume_timer;
174
175 static void zero_autoresume(unsigned long _c)
176 {
177         struct usb_composite_dev        *cdev = (void *)_c;
178         struct usb_gadget               *g = cdev->gadget;
179
180         /* unconfigured devices can't issue wakeups */
181         if (!cdev->config)
182                 return;
183
184         /* Normally the host would be woken up for something
185          * more significant than just a timer firing; likely
186          * because of some direct user request.
187          */
188         if (g->speed != USB_SPEED_UNKNOWN) {
189                 int status = usb_gadget_wakeup(g);
190                 INFO(cdev, "%s --> %d\n", __func__, status);
191         }
192 }
193
194 static void zero_suspend(struct usb_composite_dev *cdev)
195 {
196         if (cdev->gadget->speed == USB_SPEED_UNKNOWN)
197                 return;
198
199         if (autoresume) {
200                 if (max_autoresume &&
201                         (autoresume_step_ms > max_autoresume * 1000))
202                                 autoresume_step_ms = autoresume * 1000;
203
204                 mod_timer(&autoresume_timer, jiffies +
205                         msecs_to_jiffies(autoresume_step_ms));
206                 DBG(cdev, "suspend, wakeup in %d milliseconds\n",
207                         autoresume_step_ms);
208
209                 autoresume_step_ms += autoresume_interval_ms;
210         } else
211                 DBG(cdev, "%s\n", __func__);
212 }
213
214 static void zero_resume(struct usb_composite_dev *cdev)
215 {
216         DBG(cdev, "%s\n", __func__);
217         del_timer(&autoresume_timer);
218 }
219
220 /*-------------------------------------------------------------------------*/
221
222 static struct usb_configuration loopback_driver = {
223         .label          = "loopback",
224         .bConfigurationValue = 2,
225         .bmAttributes   = USB_CONFIG_ATT_SELFPOWER,
226         /* .iConfiguration = DYNAMIC */
227 };
228
229 static struct usb_function *func_ss;
230 static struct usb_function_instance *func_inst_ss;
231
232 static int ss_config_setup(struct usb_configuration *c,
233                 const struct usb_ctrlrequest *ctrl)
234 {
235         switch (ctrl->bRequest) {
236         case 0x5b:
237         case 0x5c:
238                 return func_ss->setup(func_ss, ctrl);
239         default:
240                 return -EOPNOTSUPP;
241         }
242 }
243
244 static struct usb_configuration sourcesink_driver = {
245         .label                  = "source/sink",
246         .setup                  = ss_config_setup,
247         .bConfigurationValue    = 3,
248         .bmAttributes           = USB_CONFIG_ATT_SELFPOWER,
249         /* .iConfiguration      = DYNAMIC */
250 };
251
252 module_param_named(buflen, gzero_options.bulk_buflen, uint, 0);
253 module_param_named(pattern, gzero_options.pattern, uint, S_IRUGO|S_IWUSR);
254 MODULE_PARM_DESC(pattern, "0 = all zeroes, 1 = mod63, 2 = none");
255
256 module_param_named(isoc_interval, gzero_options.isoc_interval, uint,
257                 S_IRUGO|S_IWUSR);
258 MODULE_PARM_DESC(isoc_interval, "1 - 16");
259
260 module_param_named(isoc_maxpacket, gzero_options.isoc_maxpacket, uint,
261                 S_IRUGO|S_IWUSR);
262 MODULE_PARM_DESC(isoc_maxpacket, "0 - 1023 (fs), 0 - 1024 (hs/ss)");
263
264 module_param_named(isoc_mult, gzero_options.isoc_mult, uint, S_IRUGO|S_IWUSR);
265 MODULE_PARM_DESC(isoc_mult, "0 - 2 (hs/ss only)");
266
267 module_param_named(isoc_maxburst, gzero_options.isoc_maxburst, uint,
268                 S_IRUGO|S_IWUSR);
269 MODULE_PARM_DESC(isoc_maxburst, "0 - 15 (ss only)");
270
271 module_param_named(int_interval, gzero_options.int_interval, uint,
272                 S_IRUGO|S_IWUSR);
273 MODULE_PARM_DESC(int_interval, "1 - 16");
274
275 module_param_named(int_maxpacket, gzero_options.int_maxpacket, uint,
276                 S_IRUGO|S_IWUSR);
277 MODULE_PARM_DESC(int_maxpacket, "0 - 1023 (fs), 0 - 1024 (hs/ss)");
278
279 module_param_named(int_mult, gzero_options.int_mult, uint, S_IRUGO|S_IWUSR);
280 MODULE_PARM_DESC(int_mult, "0 - 2 (hs/ss only)");
281
282 module_param_named(int_maxburst, gzero_options.int_maxburst, uint,
283                 S_IRUGO|S_IWUSR);
284 MODULE_PARM_DESC(int_maxburst, "0 - 15 (ss only)");
285
286 static struct usb_function *func_lb;
287 static struct usb_function_instance *func_inst_lb;
288
289 module_param_named(qlen, gzero_options.qlen, uint, S_IRUGO|S_IWUSR);
290 MODULE_PARM_DESC(qlen, "depth of loopback queue");
291
292 static int __init zero_bind(struct usb_composite_dev *cdev)
293 {
294         struct f_ss_opts        *ss_opts;
295         struct f_lb_opts        *lb_opts;
296         int                     status;
297
298         /* Allocate string descriptor numbers ... note that string
299          * contents can be overridden by the composite_dev glue.
300          */
301         status = usb_string_ids_tab(cdev, strings_dev);
302         if (status < 0)
303                 return status;
304
305         device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
306         device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
307         device_desc.iSerialNumber = strings_dev[USB_GADGET_SERIAL_IDX].id;
308
309         setup_timer(&autoresume_timer, zero_autoresume, (unsigned long) cdev);
310
311         func_inst_ss = usb_get_function_instance("SourceSink");
312         if (IS_ERR(func_inst_ss))
313                 return PTR_ERR(func_inst_ss);
314
315         ss_opts =  container_of(func_inst_ss, struct f_ss_opts, func_inst);
316         ss_opts->pattern = gzero_options.pattern;
317         ss_opts->isoc_interval = gzero_options.isoc_interval;
318         ss_opts->isoc_maxpacket = gzero_options.isoc_maxpacket;
319         ss_opts->isoc_mult = gzero_options.isoc_mult;
320         ss_opts->isoc_maxburst = gzero_options.isoc_maxburst;
321         ss_opts->int_interval = gzero_options.int_interval;
322         ss_opts->int_maxpacket = gzero_options.int_maxpacket;
323         ss_opts->int_mult = gzero_options.int_mult;
324         ss_opts->int_maxburst = gzero_options.int_maxburst;
325         ss_opts->bulk_buflen = gzero_options.bulk_buflen;
326
327         func_ss = usb_get_function(func_inst_ss);
328         if (IS_ERR(func_ss)) {
329                 status = PTR_ERR(func_ss);
330                 goto err_put_func_inst_ss;
331         }
332
333         func_inst_lb = usb_get_function_instance("Loopback");
334         if (IS_ERR(func_inst_lb)) {
335                 status = PTR_ERR(func_inst_lb);
336                 goto err_put_func_ss;
337         }
338
339         lb_opts = container_of(func_inst_lb, struct f_lb_opts, func_inst);
340         lb_opts->bulk_buflen = gzero_options.bulk_buflen;
341         lb_opts->qlen = gzero_options.qlen;
342
343         func_lb = usb_get_function(func_inst_lb);
344         if (IS_ERR(func_lb)) {
345                 status = PTR_ERR(func_lb);
346                 goto err_put_func_inst_lb;
347         }
348
349         sourcesink_driver.iConfiguration = strings_dev[USB_GZERO_SS_DESC].id;
350         loopback_driver.iConfiguration = strings_dev[USB_GZERO_LB_DESC].id;
351
352         /* support autoresume for remote wakeup testing */
353         sourcesink_driver.bmAttributes &= ~USB_CONFIG_ATT_WAKEUP;
354         loopback_driver.bmAttributes &= ~USB_CONFIG_ATT_WAKEUP;
355         sourcesink_driver.descriptors = NULL;
356         loopback_driver.descriptors = NULL;
357         if (autoresume) {
358                 sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
359                 loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
360                 autoresume_step_ms = autoresume * 1000;
361         }
362
363         /* support OTG systems */
364         if (gadget_is_otg(cdev->gadget)) {
365                 sourcesink_driver.descriptors = otg_desc;
366                 sourcesink_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
367                 loopback_driver.descriptors = otg_desc;
368                 loopback_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
369         }
370
371         /* Register primary, then secondary configuration.  Note that
372          * SH3 only allows one config...
373          */
374         if (loopdefault) {
375                 usb_add_config_only(cdev, &loopback_driver);
376                 usb_add_config_only(cdev, &sourcesink_driver);
377         } else {
378                 usb_add_config_only(cdev, &sourcesink_driver);
379                 usb_add_config_only(cdev, &loopback_driver);
380         }
381         status = usb_add_function(&sourcesink_driver, func_ss);
382         if (status)
383                 goto err_conf_flb;
384
385         usb_ep_autoconfig_reset(cdev->gadget);
386         status = usb_add_function(&loopback_driver, func_lb);
387         if (status)
388                 goto err_conf_flb;
389
390         usb_ep_autoconfig_reset(cdev->gadget);
391         usb_composite_overwrite_options(cdev, &coverwrite);
392
393         INFO(cdev, "%s, version: " DRIVER_VERSION "\n", longname);
394
395         return 0;
396
397 err_conf_flb:
398         usb_put_function(func_lb);
399         func_lb = NULL;
400 err_put_func_inst_lb:
401         usb_put_function_instance(func_inst_lb);
402         func_inst_lb = NULL;
403 err_put_func_ss:
404         usb_put_function(func_ss);
405         func_ss = NULL;
406 err_put_func_inst_ss:
407         usb_put_function_instance(func_inst_ss);
408         func_inst_ss = NULL;
409         return status;
410 }
411
412 static int zero_unbind(struct usb_composite_dev *cdev)
413 {
414         del_timer_sync(&autoresume_timer);
415         if (!IS_ERR_OR_NULL(func_ss))
416                 usb_put_function(func_ss);
417         usb_put_function_instance(func_inst_ss);
418         if (!IS_ERR_OR_NULL(func_lb))
419                 usb_put_function(func_lb);
420         usb_put_function_instance(func_inst_lb);
421         return 0;
422 }
423
424 static __refdata struct usb_composite_driver zero_driver = {
425         .name           = "zero",
426         .dev            = &device_desc,
427         .strings        = dev_strings,
428         .max_speed      = USB_SPEED_SUPER,
429         .bind           = zero_bind,
430         .unbind         = zero_unbind,
431         .suspend        = zero_suspend,
432         .resume         = zero_resume,
433 };
434
435 module_usb_composite_driver(zero_driver);
436
437 MODULE_AUTHOR("David Brownell");
438 MODULE_LICENSE("GPL");