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3e1c715ea1
cros_ec_wait_until_complete() sends EC_CMD_GET_COMMS_STATUS which expects to receive sizeof(struct ec_response_get_comms_status) from cros_ec_xfer_command(). Return -EPROTO if cros_ec_xfer_command() returns 0. Reviewed-by: Guenter Roeck <groeck@chromium.org> Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org> Link: https://lore.kernel.org/r/20220718050914.2267370-11-tzungbi@kernel.org
1006 lines
26 KiB
C
1006 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// ChromeOS EC communication protocol helper functions
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//
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// Copyright (C) 2015 Google, Inc
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/platform_data/cros_ec_commands.h>
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#include <linux/platform_data/cros_ec_proto.h>
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#include <linux/slab.h>
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#include <asm/unaligned.h>
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#include "cros_ec_trace.h"
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#define EC_COMMAND_RETRIES 50
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static const int cros_ec_error_map[] = {
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[EC_RES_INVALID_COMMAND] = -EOPNOTSUPP,
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[EC_RES_ERROR] = -EIO,
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[EC_RES_INVALID_PARAM] = -EINVAL,
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[EC_RES_ACCESS_DENIED] = -EACCES,
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[EC_RES_INVALID_RESPONSE] = -EPROTO,
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[EC_RES_INVALID_VERSION] = -ENOPROTOOPT,
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[EC_RES_INVALID_CHECKSUM] = -EBADMSG,
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[EC_RES_IN_PROGRESS] = -EINPROGRESS,
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[EC_RES_UNAVAILABLE] = -ENODATA,
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[EC_RES_TIMEOUT] = -ETIMEDOUT,
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[EC_RES_OVERFLOW] = -EOVERFLOW,
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[EC_RES_INVALID_HEADER] = -EBADR,
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[EC_RES_REQUEST_TRUNCATED] = -EBADR,
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[EC_RES_RESPONSE_TOO_BIG] = -EFBIG,
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[EC_RES_BUS_ERROR] = -EFAULT,
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[EC_RES_BUSY] = -EBUSY,
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[EC_RES_INVALID_HEADER_VERSION] = -EBADMSG,
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[EC_RES_INVALID_HEADER_CRC] = -EBADMSG,
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[EC_RES_INVALID_DATA_CRC] = -EBADMSG,
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[EC_RES_DUP_UNAVAILABLE] = -ENODATA,
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};
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static int cros_ec_map_error(uint32_t result)
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{
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int ret = 0;
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if (result != EC_RES_SUCCESS) {
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if (result < ARRAY_SIZE(cros_ec_error_map) && cros_ec_error_map[result])
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ret = cros_ec_error_map[result];
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else
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ret = -EPROTO;
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}
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return ret;
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}
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static int prepare_tx(struct cros_ec_device *ec_dev,
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struct cros_ec_command *msg)
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{
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struct ec_host_request *request;
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u8 *out;
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int i;
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u8 csum = 0;
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if (msg->outsize + sizeof(*request) > ec_dev->dout_size)
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return -EINVAL;
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out = ec_dev->dout;
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request = (struct ec_host_request *)out;
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request->struct_version = EC_HOST_REQUEST_VERSION;
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request->checksum = 0;
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request->command = msg->command;
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request->command_version = msg->version;
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request->reserved = 0;
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request->data_len = msg->outsize;
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for (i = 0; i < sizeof(*request); i++)
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csum += out[i];
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/* Copy data and update checksum */
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memcpy(out + sizeof(*request), msg->data, msg->outsize);
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for (i = 0; i < msg->outsize; i++)
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csum += msg->data[i];
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request->checksum = -csum;
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return sizeof(*request) + msg->outsize;
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}
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static int prepare_tx_legacy(struct cros_ec_device *ec_dev,
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struct cros_ec_command *msg)
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{
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u8 *out;
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u8 csum;
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int i;
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if (msg->outsize > EC_PROTO2_MAX_PARAM_SIZE)
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return -EINVAL;
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out = ec_dev->dout;
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out[0] = EC_CMD_VERSION0 + msg->version;
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out[1] = msg->command;
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out[2] = msg->outsize;
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csum = out[0] + out[1] + out[2];
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for (i = 0; i < msg->outsize; i++)
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csum += out[EC_MSG_TX_HEADER_BYTES + i] = msg->data[i];
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out[EC_MSG_TX_HEADER_BYTES + msg->outsize] = csum;
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return EC_MSG_TX_PROTO_BYTES + msg->outsize;
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}
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static int cros_ec_xfer_command(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
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{
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int ret;
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int (*xfer_fxn)(struct cros_ec_device *ec, struct cros_ec_command *msg);
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if (ec_dev->proto_version > 2)
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xfer_fxn = ec_dev->pkt_xfer;
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else
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xfer_fxn = ec_dev->cmd_xfer;
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if (!xfer_fxn) {
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/*
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* This error can happen if a communication error happened and
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* the EC is trying to use protocol v2, on an underlying
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* communication mechanism that does not support v2.
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*/
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dev_err_once(ec_dev->dev, "missing EC transfer API, cannot send command\n");
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return -EIO;
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}
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trace_cros_ec_request_start(msg);
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ret = (*xfer_fxn)(ec_dev, msg);
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trace_cros_ec_request_done(msg, ret);
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return ret;
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}
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static int cros_ec_wait_until_complete(struct cros_ec_device *ec_dev, uint32_t *result)
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{
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struct {
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struct cros_ec_command msg;
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struct ec_response_get_comms_status status;
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} __packed buf;
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struct cros_ec_command *msg = &buf.msg;
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struct ec_response_get_comms_status *status = &buf.status;
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int ret = 0, i;
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msg->version = 0;
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msg->command = EC_CMD_GET_COMMS_STATUS;
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msg->insize = sizeof(*status);
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msg->outsize = 0;
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/* Query the EC's status until it's no longer busy or we encounter an error. */
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for (i = 0; i < EC_COMMAND_RETRIES; ++i) {
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usleep_range(10000, 11000);
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ret = cros_ec_xfer_command(ec_dev, msg);
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if (ret == -EAGAIN)
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continue;
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if (ret < 0)
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return ret;
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*result = msg->result;
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if (msg->result != EC_RES_SUCCESS)
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return ret;
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if (ret == 0) {
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ret = -EPROTO;
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break;
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}
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if (!(status->flags & EC_COMMS_STATUS_PROCESSING))
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return ret;
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}
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if (i >= EC_COMMAND_RETRIES)
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ret = -EAGAIN;
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return ret;
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}
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static int cros_ec_send_command(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
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{
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int ret = cros_ec_xfer_command(ec_dev, msg);
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if (msg->result == EC_RES_IN_PROGRESS)
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ret = cros_ec_wait_until_complete(ec_dev, &msg->result);
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return ret;
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}
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/**
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* cros_ec_prepare_tx() - Prepare an outgoing message in the output buffer.
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* @ec_dev: Device to register.
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* @msg: Message to write.
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*
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* This is used by all ChromeOS EC drivers to prepare the outgoing message
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* according to different protocol versions.
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*
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* Return: number of prepared bytes on success or negative error code.
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*/
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int cros_ec_prepare_tx(struct cros_ec_device *ec_dev,
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struct cros_ec_command *msg)
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{
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if (ec_dev->proto_version > 2)
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return prepare_tx(ec_dev, msg);
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return prepare_tx_legacy(ec_dev, msg);
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}
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EXPORT_SYMBOL(cros_ec_prepare_tx);
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/**
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* cros_ec_check_result() - Check ec_msg->result.
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* @ec_dev: EC device.
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* @msg: Message to check.
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*
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* This is used by ChromeOS EC drivers to check the ec_msg->result for
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* EC_RES_IN_PROGRESS and to warn about them.
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*
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* The function should not check for furthermore error codes. Otherwise,
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* it would break the ABI.
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*
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* Return: -EAGAIN if ec_msg->result == EC_RES_IN_PROGRESS. Otherwise, 0.
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*/
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int cros_ec_check_result(struct cros_ec_device *ec_dev,
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struct cros_ec_command *msg)
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{
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switch (msg->result) {
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case EC_RES_SUCCESS:
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return 0;
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case EC_RES_IN_PROGRESS:
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dev_dbg(ec_dev->dev, "command 0x%02x in progress\n",
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msg->command);
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return -EAGAIN;
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default:
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dev_dbg(ec_dev->dev, "command 0x%02x returned %d\n",
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msg->command, msg->result);
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return 0;
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}
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}
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EXPORT_SYMBOL(cros_ec_check_result);
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/*
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* cros_ec_get_host_event_wake_mask
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*
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* Get the mask of host events that cause wake from suspend.
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*
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* @ec_dev: EC device to call
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* @msg: message structure to use
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* @mask: result when function returns 0.
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*
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* LOCKING:
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* the caller has ec_dev->lock mutex, or the caller knows there is
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* no other command in progress.
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*/
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static int cros_ec_get_host_event_wake_mask(struct cros_ec_device *ec_dev, uint32_t *mask)
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{
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struct cros_ec_command *msg;
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struct ec_response_host_event_mask *r;
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int ret, mapped;
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msg = kzalloc(sizeof(*msg) + sizeof(*r), GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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msg->command = EC_CMD_HOST_EVENT_GET_WAKE_MASK;
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msg->insize = sizeof(*r);
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ret = cros_ec_send_command(ec_dev, msg);
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if (ret < 0)
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goto exit;
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mapped = cros_ec_map_error(msg->result);
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if (mapped) {
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ret = mapped;
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goto exit;
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}
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if (ret == 0) {
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ret = -EPROTO;
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goto exit;
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}
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r = (struct ec_response_host_event_mask *)msg->data;
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*mask = r->mask;
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ret = 0;
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exit:
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kfree(msg);
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return ret;
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}
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static int cros_ec_get_proto_info(struct cros_ec_device *ec_dev, int devidx)
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{
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struct cros_ec_command *msg;
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struct ec_response_get_protocol_info *info;
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int ret, mapped;
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ec_dev->proto_version = 3;
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if (devidx > 0)
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ec_dev->max_passthru = 0;
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msg = kzalloc(sizeof(*msg) + sizeof(*info), GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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msg->command = EC_CMD_PASSTHRU_OFFSET(devidx) | EC_CMD_GET_PROTOCOL_INFO;
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msg->insize = sizeof(*info);
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ret = cros_ec_send_command(ec_dev, msg);
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/*
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* Send command once again when timeout occurred.
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* Fingerprint MCU (FPMCU) is restarted during system boot which
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* introduces small window in which FPMCU won't respond for any
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* messages sent by kernel. There is no need to wait before next
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* attempt because we waited at least EC_MSG_DEADLINE_MS.
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*/
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if (ret == -ETIMEDOUT)
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ret = cros_ec_send_command(ec_dev, msg);
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if (ret < 0) {
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dev_dbg(ec_dev->dev,
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"failed to check for EC[%d] protocol version: %d\n",
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devidx, ret);
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goto exit;
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}
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mapped = cros_ec_map_error(msg->result);
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if (mapped) {
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ret = mapped;
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goto exit;
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}
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if (ret == 0) {
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ret = -EPROTO;
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goto exit;
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}
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info = (struct ec_response_get_protocol_info *)msg->data;
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switch (devidx) {
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case CROS_EC_DEV_EC_INDEX:
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ec_dev->max_request = info->max_request_packet_size -
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sizeof(struct ec_host_request);
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ec_dev->max_response = info->max_response_packet_size -
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sizeof(struct ec_host_response);
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ec_dev->proto_version = min(EC_HOST_REQUEST_VERSION,
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fls(info->protocol_versions) - 1);
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ec_dev->din_size = info->max_response_packet_size + EC_MAX_RESPONSE_OVERHEAD;
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ec_dev->dout_size = info->max_request_packet_size + EC_MAX_REQUEST_OVERHEAD;
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dev_dbg(ec_dev->dev, "using proto v%u\n", ec_dev->proto_version);
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break;
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case CROS_EC_DEV_PD_INDEX:
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ec_dev->max_passthru = info->max_request_packet_size -
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sizeof(struct ec_host_request);
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dev_dbg(ec_dev->dev, "found PD chip\n");
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break;
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default:
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dev_dbg(ec_dev->dev, "unknown passthru index: %d\n", devidx);
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break;
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}
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ret = 0;
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exit:
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kfree(msg);
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return ret;
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}
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static int cros_ec_get_proto_info_legacy(struct cros_ec_device *ec_dev)
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{
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struct cros_ec_command *msg;
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struct ec_params_hello *params;
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struct ec_response_hello *response;
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int ret, mapped;
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ec_dev->proto_version = 2;
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msg = kzalloc(sizeof(*msg) + max(sizeof(*params), sizeof(*response)), GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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msg->command = EC_CMD_HELLO;
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msg->insize = sizeof(*response);
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msg->outsize = sizeof(*params);
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params = (struct ec_params_hello *)msg->data;
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params->in_data = 0xa0b0c0d0;
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ret = cros_ec_send_command(ec_dev, msg);
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if (ret < 0) {
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dev_dbg(ec_dev->dev, "EC failed to respond to v2 hello: %d\n", ret);
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goto exit;
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}
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mapped = cros_ec_map_error(msg->result);
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if (mapped) {
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ret = mapped;
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dev_err(ec_dev->dev, "EC responded to v2 hello with error: %d\n", msg->result);
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goto exit;
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}
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if (ret == 0) {
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ret = -EPROTO;
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goto exit;
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}
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response = (struct ec_response_hello *)msg->data;
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if (response->out_data != 0xa1b2c3d4) {
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dev_err(ec_dev->dev,
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"EC responded to v2 hello with bad result: %u\n",
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response->out_data);
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ret = -EBADMSG;
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goto exit;
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}
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ec_dev->max_request = EC_PROTO2_MAX_PARAM_SIZE;
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ec_dev->max_response = EC_PROTO2_MAX_PARAM_SIZE;
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ec_dev->max_passthru = 0;
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ec_dev->pkt_xfer = NULL;
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ec_dev->din_size = EC_PROTO2_MSG_BYTES;
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ec_dev->dout_size = EC_PROTO2_MSG_BYTES;
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dev_dbg(ec_dev->dev, "falling back to proto v2\n");
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ret = 0;
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exit:
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kfree(msg);
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return ret;
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}
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/*
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* cros_ec_get_host_command_version_mask
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*
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* Get the version mask of a given command.
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*
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* @ec_dev: EC device to call
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* @msg: message structure to use
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* @cmd: command to get the version of.
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* @mask: result when function returns 0.
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*
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* @return 0 on success, error code otherwise
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*
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* LOCKING:
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* the caller has ec_dev->lock mutex or the caller knows there is
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* no other command in progress.
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*/
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static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev, u16 cmd, u32 *mask)
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{
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struct ec_params_get_cmd_versions *pver;
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struct ec_response_get_cmd_versions *rver;
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struct cros_ec_command *msg;
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int ret, mapped;
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msg = kmalloc(sizeof(*msg) + max(sizeof(*rver), sizeof(*pver)),
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GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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msg->version = 0;
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msg->command = EC_CMD_GET_CMD_VERSIONS;
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msg->insize = sizeof(*rver);
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msg->outsize = sizeof(*pver);
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pver = (struct ec_params_get_cmd_versions *)msg->data;
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pver->cmd = cmd;
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ret = cros_ec_send_command(ec_dev, msg);
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if (ret < 0)
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goto exit;
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mapped = cros_ec_map_error(msg->result);
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if (mapped) {
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ret = mapped;
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goto exit;
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}
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if (ret == 0) {
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ret = -EPROTO;
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goto exit;
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}
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rver = (struct ec_response_get_cmd_versions *)msg->data;
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*mask = rver->version_mask;
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ret = 0;
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exit:
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kfree(msg);
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return ret;
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}
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/**
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* cros_ec_query_all() - Query the protocol version supported by the
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* ChromeOS EC.
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* @ec_dev: Device to register.
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*
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* Return: 0 on success or negative error code.
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*/
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int cros_ec_query_all(struct cros_ec_device *ec_dev)
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{
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struct device *dev = ec_dev->dev;
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u32 ver_mask;
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int ret;
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/* First try sending with proto v3. */
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if (!cros_ec_get_proto_info(ec_dev, CROS_EC_DEV_EC_INDEX)) {
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/* Check for PD. */
|
|
cros_ec_get_proto_info(ec_dev, CROS_EC_DEV_PD_INDEX);
|
|
} else {
|
|
/* Try querying with a v2 hello message. */
|
|
ret = cros_ec_get_proto_info_legacy(ec_dev);
|
|
if (ret) {
|
|
/*
|
|
* It's possible for a test to occur too early when
|
|
* the EC isn't listening. If this happens, we'll
|
|
* test later when the first command is run.
|
|
*/
|
|
ec_dev->proto_version = EC_PROTO_VERSION_UNKNOWN;
|
|
dev_dbg(ec_dev->dev, "EC query failed: %d\n", ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
devm_kfree(dev, ec_dev->din);
|
|
devm_kfree(dev, ec_dev->dout);
|
|
|
|
ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL);
|
|
if (!ec_dev->din) {
|
|
ret = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
ec_dev->dout = devm_kzalloc(dev, ec_dev->dout_size, GFP_KERNEL);
|
|
if (!ec_dev->dout) {
|
|
devm_kfree(dev, ec_dev->din);
|
|
ret = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
|
|
/* Probe if MKBP event is supported */
|
|
ret = cros_ec_get_host_command_version_mask(ec_dev, EC_CMD_GET_NEXT_EVENT, &ver_mask);
|
|
if (ret < 0 || ver_mask == 0) {
|
|
ec_dev->mkbp_event_supported = 0;
|
|
} else {
|
|
ec_dev->mkbp_event_supported = fls(ver_mask);
|
|
|
|
dev_dbg(ec_dev->dev, "MKBP support version %u\n", ec_dev->mkbp_event_supported - 1);
|
|
}
|
|
|
|
/* Probe if host sleep v1 is supported for S0ix failure detection. */
|
|
ret = cros_ec_get_host_command_version_mask(ec_dev, EC_CMD_HOST_SLEEP_EVENT, &ver_mask);
|
|
ec_dev->host_sleep_v1 = (ret == 0 && (ver_mask & EC_VER_MASK(1)));
|
|
|
|
/* Get host event wake mask. */
|
|
ret = cros_ec_get_host_event_wake_mask(ec_dev, &ec_dev->host_event_wake_mask);
|
|
if (ret < 0) {
|
|
/*
|
|
* If the EC doesn't support EC_CMD_HOST_EVENT_GET_WAKE_MASK,
|
|
* use a reasonable default. Note that we ignore various
|
|
* battery, AC status, and power-state events, because (a)
|
|
* those can be quite common (e.g., when sitting at full
|
|
* charge, on AC) and (b) these are not actionable wake events;
|
|
* if anything, we'd like to continue suspending (to save
|
|
* power), not wake up.
|
|
*/
|
|
ec_dev->host_event_wake_mask = U32_MAX &
|
|
~(EC_HOST_EVENT_MASK(EC_HOST_EVENT_LID_CLOSED) |
|
|
EC_HOST_EVENT_MASK(EC_HOST_EVENT_AC_DISCONNECTED) |
|
|
EC_HOST_EVENT_MASK(EC_HOST_EVENT_BATTERY_LOW) |
|
|
EC_HOST_EVENT_MASK(EC_HOST_EVENT_BATTERY_CRITICAL) |
|
|
EC_HOST_EVENT_MASK(EC_HOST_EVENT_BATTERY) |
|
|
EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU) |
|
|
EC_HOST_EVENT_MASK(EC_HOST_EVENT_BATTERY_STATUS));
|
|
/*
|
|
* Old ECs may not support this command. Complain about all
|
|
* other errors.
|
|
*/
|
|
if (ret != -EOPNOTSUPP)
|
|
dev_err(ec_dev->dev,
|
|
"failed to retrieve wake mask: %d\n", ret);
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
exit:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(cros_ec_query_all);
|
|
|
|
/**
|
|
* cros_ec_cmd_xfer() - Send a command to the ChromeOS EC.
|
|
* @ec_dev: EC device.
|
|
* @msg: Message to write.
|
|
*
|
|
* Call this to send a command to the ChromeOS EC. This should be used instead
|
|
* of calling the EC's cmd_xfer() callback directly. This function does not
|
|
* convert EC command execution error codes to Linux error codes. Most
|
|
* in-kernel users will want to use cros_ec_cmd_xfer_status() instead since
|
|
* that function implements the conversion.
|
|
*
|
|
* Return:
|
|
* >0 - EC command was executed successfully. The return value is the number
|
|
* of bytes returned by the EC (excluding the header).
|
|
* =0 - EC communication was successful. EC command execution results are
|
|
* reported in msg->result. The result will be EC_RES_SUCCESS if the
|
|
* command was executed successfully or report an EC command execution
|
|
* error.
|
|
* <0 - EC communication error. Return value is the Linux error code.
|
|
*/
|
|
int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev, struct cros_ec_command *msg)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&ec_dev->lock);
|
|
if (ec_dev->proto_version == EC_PROTO_VERSION_UNKNOWN) {
|
|
ret = cros_ec_query_all(ec_dev);
|
|
if (ret) {
|
|
dev_err(ec_dev->dev,
|
|
"EC version unknown and query failed; aborting command\n");
|
|
mutex_unlock(&ec_dev->lock);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (msg->insize > ec_dev->max_response) {
|
|
dev_dbg(ec_dev->dev, "clamping message receive buffer\n");
|
|
msg->insize = ec_dev->max_response;
|
|
}
|
|
|
|
if (msg->command < EC_CMD_PASSTHRU_OFFSET(CROS_EC_DEV_PD_INDEX)) {
|
|
if (msg->outsize > ec_dev->max_request) {
|
|
dev_err(ec_dev->dev,
|
|
"request of size %u is too big (max: %u)\n",
|
|
msg->outsize,
|
|
ec_dev->max_request);
|
|
mutex_unlock(&ec_dev->lock);
|
|
return -EMSGSIZE;
|
|
}
|
|
} else {
|
|
if (msg->outsize > ec_dev->max_passthru) {
|
|
dev_err(ec_dev->dev,
|
|
"passthru rq of size %u is too big (max: %u)\n",
|
|
msg->outsize,
|
|
ec_dev->max_passthru);
|
|
mutex_unlock(&ec_dev->lock);
|
|
return -EMSGSIZE;
|
|
}
|
|
}
|
|
|
|
ret = cros_ec_send_command(ec_dev, msg);
|
|
mutex_unlock(&ec_dev->lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(cros_ec_cmd_xfer);
|
|
|
|
/**
|
|
* cros_ec_cmd_xfer_status() - Send a command to the ChromeOS EC.
|
|
* @ec_dev: EC device.
|
|
* @msg: Message to write.
|
|
*
|
|
* Call this to send a command to the ChromeOS EC. This should be used instead of calling the EC's
|
|
* cmd_xfer() callback directly. It returns success status only if both the command was transmitted
|
|
* successfully and the EC replied with success status.
|
|
*
|
|
* Return:
|
|
* >=0 - The number of bytes transferred.
|
|
* <0 - Linux error code
|
|
*/
|
|
int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev,
|
|
struct cros_ec_command *msg)
|
|
{
|
|
int ret, mapped;
|
|
|
|
ret = cros_ec_cmd_xfer(ec_dev, msg);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
mapped = cros_ec_map_error(msg->result);
|
|
if (mapped) {
|
|
dev_dbg(ec_dev->dev, "Command result (err: %d [%d])\n",
|
|
msg->result, mapped);
|
|
ret = mapped;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(cros_ec_cmd_xfer_status);
|
|
|
|
static int get_next_event_xfer(struct cros_ec_device *ec_dev,
|
|
struct cros_ec_command *msg,
|
|
struct ec_response_get_next_event_v1 *event,
|
|
int version, uint32_t size)
|
|
{
|
|
int ret;
|
|
|
|
msg->version = version;
|
|
msg->command = EC_CMD_GET_NEXT_EVENT;
|
|
msg->insize = size;
|
|
msg->outsize = 0;
|
|
|
|
ret = cros_ec_cmd_xfer_status(ec_dev, msg);
|
|
if (ret > 0) {
|
|
ec_dev->event_size = ret - 1;
|
|
ec_dev->event_data = *event;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int get_next_event(struct cros_ec_device *ec_dev)
|
|
{
|
|
struct {
|
|
struct cros_ec_command msg;
|
|
struct ec_response_get_next_event_v1 event;
|
|
} __packed buf;
|
|
struct cros_ec_command *msg = &buf.msg;
|
|
struct ec_response_get_next_event_v1 *event = &buf.event;
|
|
const int cmd_version = ec_dev->mkbp_event_supported - 1;
|
|
|
|
memset(msg, 0, sizeof(*msg));
|
|
if (ec_dev->suspended) {
|
|
dev_dbg(ec_dev->dev, "Device suspended.\n");
|
|
return -EHOSTDOWN;
|
|
}
|
|
|
|
if (cmd_version == 0)
|
|
return get_next_event_xfer(ec_dev, msg, event, 0,
|
|
sizeof(struct ec_response_get_next_event));
|
|
|
|
return get_next_event_xfer(ec_dev, msg, event, cmd_version,
|
|
sizeof(struct ec_response_get_next_event_v1));
|
|
}
|
|
|
|
static int get_keyboard_state_event(struct cros_ec_device *ec_dev)
|
|
{
|
|
u8 buffer[sizeof(struct cros_ec_command) +
|
|
sizeof(ec_dev->event_data.data)];
|
|
struct cros_ec_command *msg = (struct cros_ec_command *)&buffer;
|
|
|
|
msg->version = 0;
|
|
msg->command = EC_CMD_MKBP_STATE;
|
|
msg->insize = sizeof(ec_dev->event_data.data);
|
|
msg->outsize = 0;
|
|
|
|
ec_dev->event_size = cros_ec_cmd_xfer_status(ec_dev, msg);
|
|
ec_dev->event_data.event_type = EC_MKBP_EVENT_KEY_MATRIX;
|
|
memcpy(&ec_dev->event_data.data, msg->data,
|
|
sizeof(ec_dev->event_data.data));
|
|
|
|
return ec_dev->event_size;
|
|
}
|
|
|
|
/**
|
|
* cros_ec_get_next_event() - Fetch next event from the ChromeOS EC.
|
|
* @ec_dev: Device to fetch event from.
|
|
* @wake_event: Pointer to a bool set to true upon return if the event might be
|
|
* treated as a wake event. Ignored if null.
|
|
* @has_more_events: Pointer to bool set to true if more than one event is
|
|
* pending.
|
|
* Some EC will set this flag to indicate cros_ec_get_next_event()
|
|
* can be called multiple times in a row.
|
|
* It is an optimization to prevent issuing a EC command for
|
|
* nothing or wait for another interrupt from the EC to process
|
|
* the next message.
|
|
* Ignored if null.
|
|
*
|
|
* Return: negative error code on errors; 0 for no data; or else number of
|
|
* bytes received (i.e., an event was retrieved successfully). Event types are
|
|
* written out to @ec_dev->event_data.event_type on success.
|
|
*/
|
|
int cros_ec_get_next_event(struct cros_ec_device *ec_dev,
|
|
bool *wake_event,
|
|
bool *has_more_events)
|
|
{
|
|
u8 event_type;
|
|
u32 host_event;
|
|
int ret;
|
|
|
|
/*
|
|
* Default value for wake_event.
|
|
* Wake up on keyboard event, wake up for spurious interrupt or link
|
|
* error to the EC.
|
|
*/
|
|
if (wake_event)
|
|
*wake_event = true;
|
|
|
|
/*
|
|
* Default value for has_more_events.
|
|
* EC will raise another interrupt if AP does not process all events
|
|
* anyway.
|
|
*/
|
|
if (has_more_events)
|
|
*has_more_events = false;
|
|
|
|
if (!ec_dev->mkbp_event_supported)
|
|
return get_keyboard_state_event(ec_dev);
|
|
|
|
ret = get_next_event(ec_dev);
|
|
if (ret <= 0)
|
|
return ret;
|
|
|
|
if (has_more_events)
|
|
*has_more_events = ec_dev->event_data.event_type &
|
|
EC_MKBP_HAS_MORE_EVENTS;
|
|
ec_dev->event_data.event_type &= EC_MKBP_EVENT_TYPE_MASK;
|
|
|
|
if (wake_event) {
|
|
event_type = ec_dev->event_data.event_type;
|
|
host_event = cros_ec_get_host_event(ec_dev);
|
|
|
|
/*
|
|
* Sensor events need to be parsed by the sensor sub-device.
|
|
* Defer them, and don't report the wakeup here.
|
|
*/
|
|
if (event_type == EC_MKBP_EVENT_SENSOR_FIFO) {
|
|
*wake_event = false;
|
|
} else if (host_event) {
|
|
/* rtc_update_irq() already handles wakeup events. */
|
|
if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_RTC))
|
|
*wake_event = false;
|
|
/* Masked host-events should not count as wake events. */
|
|
if (!(host_event & ec_dev->host_event_wake_mask))
|
|
*wake_event = false;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(cros_ec_get_next_event);
|
|
|
|
/**
|
|
* cros_ec_get_host_event() - Return a mask of event set by the ChromeOS EC.
|
|
* @ec_dev: Device to fetch event from.
|
|
*
|
|
* When MKBP is supported, when the EC raises an interrupt, we collect the
|
|
* events raised and call the functions in the ec notifier. This function
|
|
* is a helper to know which events are raised.
|
|
*
|
|
* Return: 0 on error or non-zero bitmask of one or more EC_HOST_EVENT_*.
|
|
*/
|
|
u32 cros_ec_get_host_event(struct cros_ec_device *ec_dev)
|
|
{
|
|
u32 host_event;
|
|
|
|
if (!ec_dev->mkbp_event_supported)
|
|
return 0;
|
|
|
|
if (ec_dev->event_data.event_type != EC_MKBP_EVENT_HOST_EVENT)
|
|
return 0;
|
|
|
|
if (ec_dev->event_size != sizeof(host_event)) {
|
|
dev_warn(ec_dev->dev, "Invalid host event size\n");
|
|
return 0;
|
|
}
|
|
|
|
host_event = get_unaligned_le32(&ec_dev->event_data.data.host_event);
|
|
|
|
return host_event;
|
|
}
|
|
EXPORT_SYMBOL(cros_ec_get_host_event);
|
|
|
|
/**
|
|
* cros_ec_check_features() - Test for the presence of EC features
|
|
*
|
|
* @ec: EC device, does not have to be connected directly to the AP,
|
|
* can be daisy chained through another device.
|
|
* @feature: One of ec_feature_code bit.
|
|
*
|
|
* Call this function to test whether the ChromeOS EC supports a feature.
|
|
*
|
|
* Return: true if supported, false if not (or if an error was encountered).
|
|
*/
|
|
bool cros_ec_check_features(struct cros_ec_dev *ec, int feature)
|
|
{
|
|
struct ec_response_get_features *features = &ec->features;
|
|
int ret;
|
|
|
|
if (features->flags[0] == -1U && features->flags[1] == -1U) {
|
|
/* features bitmap not read yet */
|
|
ret = cros_ec_cmd(ec->ec_dev, 0, EC_CMD_GET_FEATURES + ec->cmd_offset,
|
|
NULL, 0, features, sizeof(*features));
|
|
if (ret < 0) {
|
|
dev_warn(ec->dev, "cannot get EC features: %d\n", ret);
|
|
memset(features, 0, sizeof(*features));
|
|
}
|
|
|
|
dev_dbg(ec->dev, "EC features %08x %08x\n",
|
|
features->flags[0], features->flags[1]);
|
|
}
|
|
|
|
return !!(features->flags[feature / 32] & EC_FEATURE_MASK_0(feature));
|
|
}
|
|
EXPORT_SYMBOL_GPL(cros_ec_check_features);
|
|
|
|
/**
|
|
* cros_ec_get_sensor_count() - Return the number of MEMS sensors supported.
|
|
*
|
|
* @ec: EC device, does not have to be connected directly to the AP,
|
|
* can be daisy chained through another device.
|
|
* Return: < 0 in case of error.
|
|
*/
|
|
int cros_ec_get_sensor_count(struct cros_ec_dev *ec)
|
|
{
|
|
/*
|
|
* Issue a command to get the number of sensor reported.
|
|
* If not supported, check for legacy mode.
|
|
*/
|
|
int ret, sensor_count;
|
|
struct ec_params_motion_sense *params;
|
|
struct ec_response_motion_sense *resp;
|
|
struct cros_ec_command *msg;
|
|
struct cros_ec_device *ec_dev = ec->ec_dev;
|
|
u8 status;
|
|
|
|
msg = kzalloc(sizeof(*msg) + max(sizeof(*params), sizeof(*resp)),
|
|
GFP_KERNEL);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
msg->version = 1;
|
|
msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
|
|
msg->outsize = sizeof(*params);
|
|
msg->insize = sizeof(*resp);
|
|
|
|
params = (struct ec_params_motion_sense *)msg->data;
|
|
params->cmd = MOTIONSENSE_CMD_DUMP;
|
|
|
|
ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
|
|
if (ret < 0) {
|
|
sensor_count = ret;
|
|
} else {
|
|
resp = (struct ec_response_motion_sense *)msg->data;
|
|
sensor_count = resp->dump.sensor_count;
|
|
}
|
|
kfree(msg);
|
|
|
|
/*
|
|
* Check legacy mode: Let's find out if sensors are accessible
|
|
* via LPC interface.
|
|
*/
|
|
if (sensor_count < 0 && ec->cmd_offset == 0 && ec_dev->cmd_readmem) {
|
|
ret = ec_dev->cmd_readmem(ec_dev, EC_MEMMAP_ACC_STATUS,
|
|
1, &status);
|
|
if (ret >= 0 &&
|
|
(status & EC_MEMMAP_ACC_STATUS_PRESENCE_BIT)) {
|
|
/*
|
|
* We have 2 sensors, one in the lid, one in the base.
|
|
*/
|
|
sensor_count = 2;
|
|
} else {
|
|
/*
|
|
* EC uses LPC interface and no sensors are presented.
|
|
*/
|
|
sensor_count = 0;
|
|
}
|
|
}
|
|
return sensor_count;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cros_ec_get_sensor_count);
|
|
|
|
/**
|
|
* cros_ec_cmd - Send a command to the EC.
|
|
*
|
|
* @ec_dev: EC device
|
|
* @version: EC command version
|
|
* @command: EC command
|
|
* @outdata: EC command output data
|
|
* @outsize: Size of outdata
|
|
* @indata: EC command input data
|
|
* @insize: Size of indata
|
|
*
|
|
* Return: >= 0 on success, negative error number on failure.
|
|
*/
|
|
int cros_ec_cmd(struct cros_ec_device *ec_dev,
|
|
unsigned int version,
|
|
int command,
|
|
void *outdata,
|
|
size_t outsize,
|
|
void *indata,
|
|
size_t insize)
|
|
{
|
|
struct cros_ec_command *msg;
|
|
int ret;
|
|
|
|
msg = kzalloc(sizeof(*msg) + max(insize, outsize), GFP_KERNEL);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
msg->version = version;
|
|
msg->command = command;
|
|
msg->outsize = outsize;
|
|
msg->insize = insize;
|
|
|
|
if (outsize)
|
|
memcpy(msg->data, outdata, outsize);
|
|
|
|
ret = cros_ec_cmd_xfer_status(ec_dev, msg);
|
|
if (ret < 0)
|
|
goto error;
|
|
|
|
if (insize)
|
|
memcpy(indata, msg->data, insize);
|
|
error:
|
|
kfree(msg);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cros_ec_cmd);
|