Platform: OLPC: allow EC cmd to be overridden, and create a workqueue to call it

This provides a new API allows different OLPC architectures to override the
EC driver.  x86 and ARM OLPC machines use completely different EC backends.

The olpc_ec_cmd is synchronous, and waits for the workqueue to send the
command to the EC.  Multiple callers can run olpc_ec_cmd() at once, and
they will by serialized and sleep while only one executes on the EC at a time.

We don't provide an unregister function, as that doesn't make sense within
the context of OLPC machines - there's only ever 1 EC, it's critical to
functionality, and it certainly not hotpluggable.

Signed-off-by: Andres Salomon <dilinger@queued.net>
Acked-by: Paul Fox <pgf@laptop.org>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Andres Salomon
2012-07-11 17:40:25 -07:00
parent 3bf9428f22
commit 3d26c20bae
2 changed files with 116 additions and 2 deletions

View File

@@ -14,8 +14,14 @@
#define EC_SCI_QUERY 0x84
#define EC_EXT_SCI_QUERY 0x85
struct olpc_ec_driver {
int (*ec_cmd)(u8, u8 *, size_t, u8 *, size_t, void *);
};
#ifdef CONFIG_OLPC
extern void olpc_ec_driver_register(struct olpc_ec_driver *drv, void *arg);
extern int olpc_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf,
size_t outlen);