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mfd: cros_ec: Use fixed size arrays to transfer data with the EC

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The struct cros_ec_command will be used as an ioctl() argument for the
API to control the ChromeOS EC from user-space. So the data structure
has to be 64-bit safe to make it compatible between 32 and 64 avoiding
the need for a compat ioctl interface. Since pointers are self-aligned
to different byte boundaries, use fixed size arrays instead of pointers
for transferring ingoing and outgoing data with the Embedded Controller.

Also, re-arrange struct members by decreasing alignment requirements to
reduce the needing padding size.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Acked-by: Lee Jones <lee.jones@linaro.org>
Tested-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Javier Martinez Canillas
2015-02-02 12:26:22 +01:00
committed by Olof Johansson
parent c517d838eb
commit 1b84f2a4cd
4 changed files with 29 additions and 58 deletions
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include/linux/mfd/cros_ec.h
+4 -4
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@@ -38,20 +38,20 @@ enum {
/*
* @version: Command version number (often 0)
* @command: Command to send (EC_CMD_...)
* @outdata: Outgoing data to EC
* @outsize: Outgoing length in bytes
* @indata: Where to put the incoming data from EC
* @insize: Max number of bytes to accept from EC
* @result: EC's response to the command (separate from communication failure)
* @outdata: Outgoing data to EC
* @indata: Where to put the incoming data from EC
*/
struct cros_ec_command {
uint32_t version;
uint32_t command;
uint8_t *outdata;
uint32_t outsize;
uint8_t *indata;
uint32_t insize;
uint32_t result;
uint8_t outdata[EC_PROTO2_MAX_PARAM_SIZE];
uint8_t indata[EC_PROTO2_MAX_PARAM_SIZE];
};
/**