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mfd: cros_ec: add proto v3 skeleton

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Add support in cros_ec.c to handle EC host command protocol v3.
For v3+, probe for maximum shared protocol version and max
request, response, and passthrough sizes. For now, this will
always fall back to v2, since there is no bus-specific code
for handling proto v3 packets.

Signed-off-by: Stephen Barber <smbarber@chromium.org>
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Tested-by: Gwendal Grignou <gwendal@chromium.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Stephen Barber
2015-06-09 13:04:45 +02:00
committed by Lee Jones
parent 062476f24a
commit 2c7589af3c
6 changed files with 358 additions and 53 deletions
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28
include/linux/mfd/cros_ec.h
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@@ -21,6 +21,15 @@
#include <linux/mfd/cros_ec_commands.h>
#include <linux/mutex.h>
/*
* Max bus-specific overhead incurred by request/responses.
* I2C requires 1 additional byte for requests.
* I2C requires 2 additional bytes for responses.
* */
#define EC_PROTO_VERSION_UNKNOWN 0
#define EC_MAX_REQUEST_OVERHEAD 1
#define EC_MAX_RESPONSE_OVERHEAD 2
/*
* Command interface between EC and AP, for LPC, I2C and SPI interfaces.
*/
@@ -88,6 +97,7 @@ struct cros_ec_command {
* Returns the number of bytes received if the communication succeeded, but
* that doesn't mean the EC was happy with the command. The caller
* should check msg.result for the EC's result code.
* @pkt_xfer: send packet to EC and get response
* @lock: one transaction at a time
*/
struct cros_ec_device {
@@ -104,15 +114,21 @@ struct cros_ec_device {
unsigned int bytes, void *dest);
/* These are used to implement the platform-specific interface */
u16 max_request;
u16 max_response;
u16 max_passthru;
u16 proto_version;
void *priv;
int irq;
uint8_t *din;
uint8_t *dout;
u8 *din;
u8 *dout;
int din_size;
int dout_size;
bool wake_enabled;
int (*cmd_xfer)(struct cros_ec_device *ec,
struct cros_ec_command *msg);
int (*pkt_xfer)(struct cros_ec_device *ec,
struct cros_ec_command *msg);
struct mutex lock;
};
@@ -194,4 +210,12 @@ int cros_ec_remove(struct cros_ec_device *ec_dev);
*/
int cros_ec_register(struct cros_ec_device *ec_dev);
/**
* cros_ec_register - Query the protocol version supported by the ChromeOS EC
*
* @ec_dev: Device to register
* @return 0 if ok, -ve on error
*/
int cros_ec_query_all(struct cros_ec_device *ec_dev);
#endif /* __LINUX_MFD_CROS_EC_H */