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

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

51
drivers/i2c/busses/i2c-cros-ec-tunnel.c
View File

@ -182,72 +182,41 @@ static int ec_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg i2c_msgs[],
const u16 bus_num = bus->remote_bus;
int request_len;
int response_len;
u8 *request = NULL;
u8 *response = NULL;
int result;
struct cros_ec_command msg;
struct cros_ec_command msg = { };
request_len = ec_i2c_count_message(i2c_msgs, num);
if (request_len < 0) {
dev_warn(dev, "Error constructing message %d\n", request_len);
result = request_len;
goto exit;
return request_len;
}
response_len = ec_i2c_count_response(i2c_msgs, num);
if (response_len < 0) {
/* Unexpected; no errors should come when NULL response */
dev_warn(dev, "Error preparing response %d\n", response_len);
result = response_len;
goto exit;
return response_len;
}
if (request_len <= ARRAY_SIZE(bus->request_buf)) {
request = bus->request_buf;
} else {
request = kzalloc(request_len, GFP_KERNEL);
if (request == NULL) {
result = -ENOMEM;
goto exit;
}
}
if (response_len <= ARRAY_SIZE(bus->response_buf)) {
response = bus->response_buf;
} else {
response = kzalloc(response_len, GFP_KERNEL);
if (response == NULL) {
result = -ENOMEM;
goto exit;
}
}
result = ec_i2c_construct_message(request, i2c_msgs, num, bus_num);
result = ec_i2c_construct_message(msg.outdata, i2c_msgs, num, bus_num);
if (result)
goto exit;
return result;
msg.version = 0;
msg.command = EC_CMD_I2C_PASSTHRU;
msg.outdata = request;
msg.outsize = request_len;
msg.indata = response;
msg.insize = response_len;
result = cros_ec_cmd_xfer(bus->ec, &msg);
if (result < 0)
goto exit;
return result;
result = ec_i2c_parse_response(response, i2c_msgs, &num);
result = ec_i2c_parse_response(msg.indata, i2c_msgs, &num);
if (result < 0)
goto exit;
return result;
/* Indicate success by saying how many messages were sent */
result = num;
exit:
if (request != bus->request_buf)
kfree(request);
if (response != bus->response_buf)
kfree(response);
return result;
return num;
}
static u32 ec_i2c_functionality(struct i2c_adapter *adap)

13
drivers/input/keyboard/cros_ec_keyb.c
View File

@ -148,16 +148,19 @@ static void cros_ec_keyb_process(struct cros_ec_keyb *ckdev,
static int cros_ec_keyb_get_state(struct cros_ec_keyb *ckdev, uint8_t *kb_state)
{
int ret;
struct cros_ec_command msg = {
.version = 0,
.command = EC_CMD_MKBP_STATE,
.outdata = NULL,
.outsize = 0,
.indata = kb_state,
.insize = ckdev->cols,
};
return cros_ec_cmd_xfer(ckdev->ec, &msg);
ret = cros_ec_cmd_xfer(ckdev->ec, &msg);
if (ret < 0)
return ret;
memcpy(kb_state, msg.indata, ckdev->cols);
return 0;
}
static irqreturn_t cros_ec_keyb_irq(int irq, void *data)

15
drivers/mfd/cros_ec.c
View File

@ -74,15 +74,11 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
ret = ec_dev->cmd_xfer(ec_dev, msg);
if (msg->result == EC_RES_IN_PROGRESS) {
int i;
struct cros_ec_command status_msg;
struct ec_response_get_comms_status status;
struct cros_ec_command status_msg = { };
struct ec_response_get_comms_status *status;
status_msg.version = 0;
status_msg.command = EC_CMD_GET_COMMS_STATUS;
status_msg.outdata = NULL;
status_msg.outsize = 0;
status_msg.indata = (uint8_t *)&status;
status_msg.insize = sizeof(status);
status_msg.insize = sizeof(*status);
/*
* Query the EC's status until it's no longer busy or
@ -98,7 +94,10 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
msg->result = status_msg.result;
if (status_msg.result != EC_RES_SUCCESS)
break;
if (!(status.flags & EC_COMMS_STATUS_PROCESSING))
status = (struct ec_response_get_comms_status *)
status_msg.indata;
if (!(status->flags & EC_COMMS_STATUS_PROCESSING))
break;
}
}

8
include/linux/mfd/cros_ec.h
View File

@ -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];
};
/**