sh: Add maple bus support for the SEGA Dreamcast.

The Maple bus is SEGA's proprietary serial bus for peripherals
(keyboard, mouse, controller etc). The bus is capable of some
(limited) hotplugging and operates at up to 2 M/bits.

Drivers of one sort or another existed/exist for 2.4 and a rudimentary
port, which didn't support the 2.6 device driver model was also in
existence.

This driver - for the bus logic itself and for the keyboard (other
drivers will follow) are based on the code and concepts of those old
drivers but have lots of completely rewritten parts.

I have the maple bus code as a built in now as that seems the sane and
rational way to handle something like that - you either want the bus
or you don't.

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

1 files changed, 80 insertions, 0 deletions

diff --git a/include/linux/maple.h b/include/linux/maple.h
new file mode 100644
index 000000000000..bad9a7b319de
--- /dev/null
+++ b/include/linux/maple.h
@@ -0,0 +1,80 @@
+#ifndef __LINUX_MAPLE_H
+#define __LINUX_MAPLE_H
+
+#include <linux/device.h>
+
+extern struct bus_type maple_bus_type;
+
+/* Maple Bus command and response codes */
+enum maple_code {
+       MAPLE_RESPONSE_FILEERR = -5,
+       MAPLE_RESPONSE_AGAIN = -4,      /* request should be retransmitted */
+       MAPLE_RESPONSE_BADCMD = -3,
+       MAPLE_RESPONSE_BADFUNC = -2,
+       MAPLE_RESPONSE_NONE = -1,       /* unit didn't respond at all */
+       MAPLE_COMMAND_DEVINFO = 1,
+       MAPLE_COMMAND_ALLINFO = 2,
+       MAPLE_COMMAND_RESET = 3,
+       MAPLE_COMMAND_KILL = 4,
+       MAPLE_RESPONSE_DEVINFO = 5,
+       MAPLE_RESPONSE_ALLINFO = 6,
+       MAPLE_RESPONSE_OK = 7,
+       MAPLE_RESPONSE_DATATRF = 8,
+       MAPLE_COMMAND_GETCOND = 9,
+       MAPLE_COMMAND_GETMINFO = 10,
+       MAPLE_COMMAND_BREAD = 11,
+       MAPLE_COMMAND_BWRITE = 12,
+       MAPLE_COMMAND_SETCOND = 14
+};
+
+struct mapleq {
+       struct list_head list;
+       struct maple_device *dev;
+       void *sendbuf, *recvbuf, *recvbufdcsp;
+       unsigned char length;
+       enum maple_code command;
+};
+
+struct maple_devinfo {
+       unsigned long function;
+       unsigned long function_data[3];
+       unsigned char area_code;
+       unsigned char connector_directon;
+       char product_name[31];
+       char product_licence[61];
+       unsigned short standby_power;
+       unsigned short max_power;
+};
+
+struct maple_device {
+       struct maple_driver *driver;
+       struct mapleq *mq;
+       void *private_data;
+       void (*callback) (struct mapleq * mq);
+       unsigned long when, interval, function;
+       struct maple_devinfo devinfo;
+       unsigned char port, unit;
+       char product_name[32];
+       char product_licence[64];
+       int registered;
+       struct device dev;
+};
+
+struct maple_driver {
+       unsigned long function;
+       int (*connect) (struct maple_device * dev);
+       void (*disconnect) (struct maple_device * dev);
+       struct device_driver drv;
+};
+
+void maple_getcond_callback(struct maple_device *dev,
+                           void (*callback) (struct mapleq * mq),
+                           unsigned long interval,
+                           unsigned long function);
+int maple_driver_register(struct device_driver *drv);
+void maple_add_packet(struct mapleq *mq);
+
+#define to_maple_dev(n) container_of(n, struct maple_device, dev)
+#define to_maple_driver(n) container_of(n, struct maple_driver, drv)
+
+#endif /* __LINUX_MAPLE_H */