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