USB: gadget: gadget zero cleanups

Clean up gadget zero, using newer APIs and conventions:

 - gadget_is_dualspeed() and gadget_is_otg() ... #ifdef removal

 - Remove many now-needless #includes

 - Use the VERBOSE_DEBUG convention

 - Some whitespace fixes.

 - A few comment updates
 
 - Plus a few other small cleanups:  don't pass gfp_t around when it's
   always going to be GFP_ATOMIC, and do static init of serial number.

Also go to straight GPL; there's no real point in dual licensing this
stuff any more.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 96 insertions, 141 deletions

diff --git a/drivers/usb/gadget/zero.c b/drivers/usb/gadget/zero.c
index fcfe869acb94..ff540879ce3a 100644
--- a/drivers/usb/gadget/zero.c
+++ b/drivers/usb/gadget/zero.c
@@ -1,38 +1,22 @@
 /*
  * zero.c -- Gadget Zero, for USB development
  *
- * Copyright (C) 2003-2004 David Brownell
+ * Copyright (C) 2003-2007 David Brownell
  * All rights reserved.
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions, and the following disclaimer,
- *    without modification.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. The names of the above-listed copyright holders may not be used
- *    to endorse or promote products derived from this software without
- *    specific prior written permission.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
  *
- * ALTERNATIVELY, this software may be 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.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
  *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
- * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
 
@@ -57,30 +41,18 @@
  * Many drivers will only have one configuration, letting them be much
  * simpler if they also don't support high speed operation (like this
  * driver does).
+ *
+ * Why is *this* driver using two configurations, rather than setting up
+ * two interfaces with different functions?  To help verify that multiple
+ * configuration infrastucture is working correctly; also, so that it can
+ * work with low capability USB controllers without four bulk endpoints.
  */
 
-#define DEBUG 1
-// #define VERBOSE
+/* #define VERBOSE_DEBUG */
 
-#include <linux/module.h>
 #include <linux/kernel.h>
-#include <linux/delay.h>
-#include <linux/ioport.h>
-#include <linux/slab.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/timer.h>
-#include <linux/list.h>
-#include <linux/interrupt.h>
 #include <linux/utsname.h>
 #include <linux/device.h>
-#include <linux/moduleparam.h>
-
-#include <asm/byteorder.h>
-#include <asm/io.h>
-#include <asm/irq.h>
-#include <asm/system.h>
-#include <asm/unaligned.h>
 
 #include <linux/usb/ch9.h>
 #include <linux/usb_gadget.h>
@@ -90,7 +62,7 @@
 
 /*-------------------------------------------------------------------------*/
 
-#define DRIVER_VERSION          "St Patrick's Day 2004"
+#define DRIVER_VERSION          "Lughnasadh, 2007"
 
 static const char shortname [] = "zero";
 static const char longname [] = "Gadget Zero";
@@ -131,30 +103,16 @@ struct zero_dev {
         struct timer_list       resume;
 };
 
-#define xprintk(d,level,fmt,args...) \
-        dev_printk(level , &(d)->gadget->dev , fmt , ## args)
-
-#ifdef DEBUG
-#define DBG(dev,fmt,args...) \
-        xprintk(dev , KERN_DEBUG , fmt , ## args)
-#else
-#define DBG(dev,fmt,args...) \
-        do { } while (0)
-#endif /* DEBUG */
-
-#ifdef VERBOSE
-#define VDBG    DBG
-#else
-#define VDBG(dev,fmt,args...) \
-        do { } while (0)
-#endif /* VERBOSE */
-
-#define ERROR(dev,fmt,args...) \
-        xprintk(dev , KERN_ERR , fmt , ## args)
-#define WARN(dev,fmt,args...) \
-        xprintk(dev , KERN_WARNING , fmt , ## args)
-#define INFO(dev,fmt,args...) \
-        xprintk(dev , KERN_INFO , fmt , ## args)
+#define DBG(d, fmt, args...) \
+        dev_dbg(&(d)->gadget->dev , fmt , ## args)
+#define VDBG(d, fmt, args...) \
+        dev_vdbg(&(d)->gadget->dev , fmt , ## args)
+#define ERROR(d, fmt, args...) \
+        dev_err(&(d)->gadget->dev , fmt , ## args)
+#define WARN(d, fmt, args...) \
+        dev_warn(&(d)->gadget->dev , fmt , ## args)
+#define INFO(d, fmt, args...) \
+        dev_info(&(d)->gadget->dev , fmt , ## args)
 
 /*-------------------------------------------------------------------------*/
 
@@ -326,8 +284,6 @@ static const struct usb_descriptor_header *fs_loopback_function [] = {
         NULL,
 };
 
-#ifdef  CONFIG_USB_GADGET_DUALSPEED
-
 /*
  * usb 2.0 devices need to expose both high speed and full speed
  * descriptors, unless they only run at full speed.
@@ -383,17 +339,20 @@ static const struct usb_descriptor_header *hs_loopback_function [] = {
 };
 
 /* maxpacket and other transfer characteristics vary by speed. */
-#define ep_desc(g,hs,fs) (((g)->speed==USB_SPEED_HIGH)?(hs):(fs))
-
-#else
+static inline struct usb_endpoint_descriptor *
+ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *hs,
+                struct usb_endpoint_descriptor *fs)
+{
+        if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
+                return hs;
+        return fs;
+}
 
-/* if there's no high speed support, maxpacket doesn't change. */
-#define ep_desc(g,hs,fs) fs
+static char manufacturer[50];
 
-#endif  /* !CONFIG_USB_GADGET_DUALSPEED */
+/* default serial number takes at least two packets */
+static char serial[] = "0123456789.0123456789.0123456789";
 
-static char                             manufacturer [50];
-static char                             serial [40];
 
 /* static strings, in UTF-8 */
 static struct usb_string                strings [] = {
@@ -435,30 +394,29 @@ config_buf (struct usb_gadget *gadget,
         int                             is_source_sink;
         int                             len;
         const struct usb_descriptor_header **function;
-#ifdef CONFIG_USB_GADGET_DUALSPEED
-        int                             hs = (gadget->speed == USB_SPEED_HIGH);
-#endif
+        int                             hs = 0;
 
         /* two configurations will always be index 0 and index 1 */
         if (index > 1)
                 return -EINVAL;
         is_source_sink = loopdefault ? (index == 1) : (index == 0);
 
-#ifdef CONFIG_USB_GADGET_DUALSPEED
-        if (type == USB_DT_OTHER_SPEED_CONFIG)
-                hs = !hs;
+        if (gadget_is_dualspeed(gadget)) {
+                hs = (gadget->speed == USB_SPEED_HIGH);
+                if (type == USB_DT_OTHER_SPEED_CONFIG)
+                        hs = !hs;
+        }
         if (hs)
                 function = is_source_sink
                         ? hs_source_sink_function
                         : hs_loopback_function;
         else
-#endif
                 function = is_source_sink
                         ? fs_source_sink_function
                         : fs_loopback_function;
 
         /* for now, don't advertise srp-only devices */
-        if (!gadget->is_otg)
+        if (!gadget_is_otg(gadget))
                 function++;
 
         len = usb_gadget_config_buf (is_source_sink
@@ -498,6 +456,19 @@ static void free_ep_req (struct usb_ep *ep, struct usb_request *req)
 
 /*-------------------------------------------------------------------------*/
 
+/*
+ * SOURCE/SINK FUNCTION ... a primary testing vehicle for USB peripherals,
+ * this just sinks bulk packets OUT to the peripheral and sources them IN
+ * to the host, optionally with specific data patterns.
+ *
+ * In terms of control messaging, this supports all the standard requests
+ * plus two that support control-OUT tests.
+ *
+ * Note that because this doesn't queue more than one request at a time,
+ * some other function must be used to test queueing logic.  The network
+ * link (g_ether) is probably the best option for that.
+ */
+
 /* optionally require specific source/sink data patterns  */
 
 static int
@@ -534,12 +505,7 @@ check_read_data (
         return 0;
 }
 
-static void
-reinit_write_data (
-        struct zero_dev         *dev,
-        struct usb_ep           *ep,
-        struct usb_request      *req
-)
+static void reinit_write_data(struct usb_ep *ep, struct usb_request *req)
 {
         unsigned        i;
         u8              *buf = req->buf;
@@ -566,16 +532,16 @@ static void source_sink_complete (struct usb_ep *ep, struct usb_request *req)
 
         switch (status) {
 
-        case 0:                         /* normal completion? */
+        case 0:                         /* normal completion? */
                 if (ep == dev->out_ep) {
                         check_read_data (dev, ep, req);
                         memset (req->buf, 0x55, req->length);
                 } else
-                        reinit_write_data (dev, ep, req);
+                        reinit_write_data(ep, req);
                 break;
 
         /* this endpoint is normally active while we're configured */
-        case -ECONNABORTED:             /* hardware forced ep reset */
+        case -ECONNABORTED:             /* hardware forced ep reset */
         case -ECONNRESET:               /* request dequeued */
         case -ESHUTDOWN:                /* disconnect from host */
                 VDBG (dev, "%s gone (%d), %d/%d\n", ep->name, status,
@@ -607,8 +573,7 @@ static void source_sink_complete (struct usb_ep *ep, struct usb_request *req)
         }
 }
 
-static struct usb_request *
-source_sink_start_ep (struct usb_ep *ep, gfp_t gfp_flags)
+static struct usb_request *source_sink_start_ep(struct usb_ep *ep)
 {
         struct usb_request      *req;
         int                     status;
@@ -621,11 +586,11 @@ source_sink_start_ep (struct usb_ep *ep, gfp_t gfp_flags)
         req->complete = source_sink_complete;
 
         if (strcmp (ep->name, EP_IN_NAME) == 0)
-                reinit_write_data (ep->driver_data, ep, req);
+                reinit_write_data(ep, req);
         else
                 memset (req->buf, 0x55, req->length);
 
-        status = usb_ep_queue (ep, req, gfp_flags);
+        status = usb_ep_queue(ep, req, GFP_ATOMIC);
         if (status) {
                 struct zero_dev *dev = ep->driver_data;
 
@@ -637,8 +602,7 @@ source_sink_start_ep (struct usb_ep *ep, gfp_t gfp_flags)
         return req;
 }
 
-static int
-set_source_sink_config (struct zero_dev *dev, gfp_t gfp_flags)
+static int set_source_sink_config(struct zero_dev *dev)
 {
         int                     result = 0;
         struct usb_ep           *ep;
@@ -653,8 +617,7 @@ set_source_sink_config (struct zero_dev *dev, gfp_t gfp_flags)
                         result = usb_ep_enable (ep, d);
                         if (result == 0) {
                                 ep->driver_data = dev;
-                                if (source_sink_start_ep(ep, gfp_flags)
-                                                != NULL) {
+                                if (source_sink_start_ep(ep) != NULL) {
                                         dev->in_ep = ep;
                                         continue;
                                 }
@@ -668,8 +631,7 @@ set_source_sink_config (struct zero_dev *dev, gfp_t gfp_flags)
                         result = usb_ep_enable (ep, d);
                         if (result == 0) {
                                 ep->driver_data = dev;
-                                if (source_sink_start_ep(ep, gfp_flags)
-                                                != NULL) {
+                                if (source_sink_start_ep(ep) != NULL) {
                                         dev->out_ep = ep;
                                         continue;
                                 }
@@ -701,7 +663,7 @@ static void loopback_complete (struct usb_ep *ep, struct usb_request *req)
 
         switch (status) {
 
-        case 0:                         /* normal completion? */
+        case 0:                         /* normal completion? */
                 if (ep == dev->out_ep) {
                         /* loop this OUT packet back IN to the host */
                         req->zero = (req->actual < req->length);
@@ -735,7 +697,7 @@ static void loopback_complete (struct usb_ep *ep, struct usb_request *req)
          * rely on the hardware driver to clean up on disconnect or
          * endpoint disable.
          */
-        case -ECONNABORTED:             /* hardware forced ep reset */
+        case -ECONNABORTED:             /* hardware forced ep reset */
         case -ECONNRESET:               /* request dequeued */
         case -ESHUTDOWN:                /* disconnect from host */
                 free_ep_req (ep, req);
@@ -743,8 +705,7 @@ static void loopback_complete (struct usb_ep *ep, struct usb_request *req)
         }
 }
 
-static int
-set_loopback_config (struct zero_dev *dev, gfp_t gfp_flags)
+static int set_loopback_config(struct zero_dev *dev)
 {
         int                     result = 0;
         struct usb_ep           *ep;
@@ -844,8 +805,7 @@ static void zero_reset_config (struct zero_dev *dev)
  * code can do, perhaps by disallowing more than one configuration or
  * by limiting configuration choices (like the pxa2xx).
  */
-static int
-zero_set_config (struct zero_dev *dev, unsigned number, gfp_t gfp_flags)
+static int zero_set_config(struct zero_dev *dev, unsigned number)
 {
         int                     result = 0;
         struct usb_gadget       *gadget = dev->gadget;
@@ -855,17 +815,17 @@ zero_set_config (struct zero_dev *dev, unsigned number, gfp_t gfp_flags)
 
         if (gadget_is_sa1100 (gadget) && dev->config) {
                 /* tx fifo is full, but we can't clear it...*/
-                INFO (dev, "can't change configurations\n");
+                ERROR(dev, "can't change configurations\n");
                 return -ESPIPE;
         }
         zero_reset_config (dev);
 
         switch (number) {
         case CONFIG_SOURCE_SINK:
-                result = set_source_sink_config (dev, gfp_flags);
+                result = set_source_sink_config(dev);
                 break;
         case CONFIG_LOOPBACK:
-                result = set_loopback_config (dev, gfp_flags);
+                result = set_loopback_config(dev);
                 break;
         default:
                 result = -EINVAL;
@@ -885,7 +845,7 @@ zero_set_config (struct zero_dev *dev, unsigned number, gfp_t gfp_flags)
                 case USB_SPEED_LOW:     speed = "low"; break;
                 case USB_SPEED_FULL:    speed = "full"; break;
                 case USB_SPEED_HIGH:    speed = "high"; break;
-                default:                speed = "?"; break;
+                default:                speed = "?"; break;
                 }
 
                 dev->config = number;
@@ -938,19 +898,17 @@ zero_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
                         value = min (w_length, (u16) sizeof device_desc);
                         memcpy (req->buf, &device_desc, value);
                         break;
-#ifdef CONFIG_USB_GADGET_DUALSPEED
                 case USB_DT_DEVICE_QUALIFIER:
-                        if (!gadget->is_dualspeed)
+                        if (!gadget_is_dualspeed(gadget))
                                 break;
                         value = min (w_length, (u16) sizeof dev_qualifier);
                         memcpy (req->buf, &dev_qualifier, value);
                         break;
 
                 case USB_DT_OTHER_SPEED_CONFIG:
-                        if (!gadget->is_dualspeed)
+                        if (!gadget_is_dualspeed(gadget))
                                 break;
                         // FALLTHROUGH
-#endif /* CONFIG_USB_GADGET_DUALSPEED */
                 case USB_DT_CONFIG:
                         value = config_buf (gadget, req->buf,
                                         w_value >> 8,
@@ -984,7 +942,7 @@ zero_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
                 else
                         VDBG (dev, "HNP inactive\n");
                 spin_lock (&dev->lock);
-                value = zero_set_config (dev, w_value, GFP_ATOMIC);
+                value = zero_set_config(dev, w_value);
                 spin_unlock (&dev->lock);
                 break;
         case USB_REQ_GET_CONFIGURATION:
@@ -1013,7 +971,7 @@ zero_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
                          * use this "reset the config" shortcut.
                          */
                         zero_reset_config (dev);
-                        zero_set_config (dev, config, GFP_ATOMIC);
+                        zero_set_config(dev, config);
                         value = 0;
                 }
                 spin_unlock (&dev->lock);
@@ -1163,7 +1121,7 @@ autoconf_fail:
         }
         EP_IN_NAME = ep->name;
         ep->driver_data = ep;   /* claim */
-        
+
         ep = usb_ep_autoconfig (gadget, &fs_sink_desc);
         if (!ep)
                 goto autoconf_fail;
@@ -1207,16 +1165,18 @@ autoconf_fail:
 
         device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
 
-#ifdef CONFIG_USB_GADGET_DUALSPEED
-        /* assume ep0 uses the same value for both speeds ... */
-        dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;
+        if (gadget_is_dualspeed(gadget)) {
+                /* assume ep0 uses the same value for both speeds ... */
+                dev_qualifier.bMaxPacketSize0 = device_desc.bMaxPacketSize0;
 
-        /* and that all endpoints are dual-speed */
-        hs_source_desc.bEndpointAddress = fs_source_desc.bEndpointAddress;
-        hs_sink_desc.bEndpointAddress = fs_sink_desc.bEndpointAddress;
-#endif
+                /* and that all endpoints are dual-speed */
+                hs_source_desc.bEndpointAddress =
+                                fs_source_desc.bEndpointAddress;
+                hs_sink_desc.bEndpointAddress =
+                                fs_sink_desc.bEndpointAddress;
+        }
 
-        if (gadget->is_otg) {
+        if (gadget_is_otg(gadget)) {
                 otg_descriptor.bmAttributes |= USB_OTG_HNP,
                 source_sink_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
                 loopback_config.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
@@ -1294,23 +1254,18 @@ static struct usb_gadget_driver zero_driver = {
         .suspend        = zero_suspend,
         .resume         = zero_resume,
 
-        .driver         = {
+        .driver         = {
                 .name           = (char *) shortname,
                 .owner          = THIS_MODULE,
         },
 };
 
-MODULE_AUTHOR ("David Brownell");
-MODULE_LICENSE ("Dual BSD/GPL");
+MODULE_AUTHOR("David Brownell");
+MODULE_LICENSE("GPL");
 
 
 static int __init init (void)
 {
-        /* a real value would likely come through some id prom
-         * or module option.  this one takes at least two packets.
-         */
-        strlcpy (serial, "0123456789.0123456789.0123456789", sizeof serial);
-
         return usb_gadget_register_driver (&zero_driver);
 }
 module_init (init);