sh: maple: Support block reads and writes.

This patch updates the maple bus to support asynchronous block reads
and writes as well as generally improving the quality of the code and
supporting concurrency (all needed to support the Dreamcast visual
memory unit - a driver will also be posted for that).

Changes in the bus driver necessitate some changes in the two maple bus
input drivers that are currently in mainline.

As well as supporting block reads and writes this code clean up removes
some poor handling of locks, uses an atomic status variable to serialise
access to devices and more robusly handles the general performance
problems of the bus.

Signed-off-by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

drivers/input/joystick/maplecontrol.c

@@ -3,7 +3,7 @@
  *	Based on drivers/usb/iforce.c
  *
  *	Copyright Yaegashi Takeshi, 2001
- *	Adrian McMenamin, 2008
+ *	Adrian McMenamin, 2008 - 2009
  */
 
 #include <linux/kernel.h>
@@ -29,7 +29,7 @@ static void dc_pad_callback(struct mapleq *mq)
 	struct maple_device *mapledev = mq->dev;
 	struct dc_pad *pad = maple_get_drvdata(mapledev);
 	struct input_dev *dev = pad->dev;
-	unsigned char *res = mq->recvbuf;
+	unsigned char *res = mq->recvbuf->buf;
 
 	buttons = ~le16_to_cpup((__le16 *)(res + 8));
 

drivers/input/keyboard/maple_keyb.c

@@ -1,8 +1,8 @@
 /*
  * SEGA Dreamcast keyboard driver
  * Based on drivers/usb/usbkbd.c
- * Copyright YAEGASHI Takeshi, 2001
- * Porting to 2.6 Copyright Adrian McMenamin, 2007, 2008
+ * Copyright (c) YAEGASHI Takeshi, 2001
+ * Porting to 2.6 Copyright (c) Adrian McMenamin, 2007 - 2009
  *
  * 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
@@ -33,7 +33,7 @@ static DEFINE_MUTEX(maple_keyb_mutex);
 
 #define NR_SCANCODES 256
 
-MODULE_AUTHOR("YAEGASHI Takeshi, Adrian McMenamin");
+MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk");
 MODULE_DESCRIPTION("SEGA Dreamcast keyboard driver");
 MODULE_LICENSE("GPL");
 
@@ -115,7 +115,7 @@ static void dc_scan_kbd(struct dc_kbd *kbd)
 				input_event(dev, EV_MSC, MSC_SCAN, code);
 				input_report_key(dev, keycode, 0);
 			} else
-				printk(KERN_DEBUG "maple_keyb: "
+				dev_dbg(&dev->dev,
 					"Unknown key (scancode %#x) released.",
 					code);
 		}
@@ -127,7 +127,7 @@ static void dc_scan_kbd(struct dc_kbd *kbd)
 				input_event(dev, EV_MSC, MSC_SCAN, code);
 				input_report_key(dev, keycode, 1);
 			} else
-				printk(KERN_DEBUG "maple_keyb: "
+				dev_dbg(&dev->dev,
 					"Unknown key (scancode %#x) pressed.",
 					code);
 		}
@@ -140,7 +140,7 @@ static void dc_kbd_callback(struct mapleq *mq)
 {
 	struct maple_device *mapledev = mq->dev;
 	struct dc_kbd *kbd = maple_get_drvdata(mapledev);
-	unsigned long *buf = mq->recvbuf;
+	unsigned long *buf = (unsigned long *)(mq->recvbuf->buf);
 
 	/*
 	 * We should always get the lock because the only
@@ -159,22 +159,27 @@ static void dc_kbd_callback(struct mapleq *mq)
 
 static int probe_maple_kbd(struct device *dev)
 {
-	struct maple_device *mdev = to_maple_dev(dev);
-	struct maple_driver *mdrv = to_maple_driver(dev->driver);
+	struct maple_device *mdev;
+	struct maple_driver *mdrv;
 	int i, error;
 	struct dc_kbd *kbd;
 	struct input_dev *idev;
 
-	if (!(mdev->function & MAPLE_FUNC_KEYBOARD))
-		return -EINVAL;
+	mdev = to_maple_dev(dev);
+	mdrv = to_maple_driver(dev->driver);
 
 	kbd = kzalloc(sizeof(struct dc_kbd), GFP_KERNEL);
-	idev = input_allocate_device();
-	if (!kbd || !idev) {
+	if (!kbd) {
 		error = -ENOMEM;
 		goto fail;
 	}
 
+	idev = input_allocate_device();
+	if (!idev) {
+		error = -ENOMEM;
+		goto fail_idev_alloc;
+	}
+
 	kbd->dev = idev;
 	memcpy(kbd->keycode, dc_kbd_keycode, sizeof(kbd->keycode));
 
@@ -195,7 +200,7 @@ static int probe_maple_kbd(struct device *dev)
 
 	error = input_register_device(idev);
 	if (error)
-		goto fail;
+		goto fail_register;
 
 	/* Maple polling is locked to VBLANK - which may be just 50/s */
 	maple_getcond_callback(mdev, dc_kbd_callback, HZ/50,
@@ -207,10 +212,12 @@ static int probe_maple_kbd(struct device *dev)
 
 	return error;
 
-fail:
+fail_register:
+	maple_set_drvdata(mdev, NULL);
 	input_free_device(idev);
+fail_idev_alloc:
 	kfree(kbd);
-	maple_set_drvdata(mdev, NULL);
+fail:
 	return error;
 }