585 lines
14 KiB
C
585 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Greybus CPort control protocol.
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*
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* Copyright 2015 Google Inc.
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* Copyright 2015 Linaro Ltd.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/greybus.h>
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/* Highest control-protocol version supported */
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#define GB_CONTROL_VERSION_MAJOR 0
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#define GB_CONTROL_VERSION_MINOR 1
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static int gb_control_get_version(struct gb_control *control)
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{
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struct gb_interface *intf = control->connection->intf;
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struct gb_control_version_request request;
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struct gb_control_version_response response;
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int ret;
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request.major = GB_CONTROL_VERSION_MAJOR;
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request.minor = GB_CONTROL_VERSION_MINOR;
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ret = gb_operation_sync(control->connection,
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GB_CONTROL_TYPE_VERSION,
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&request, sizeof(request), &response,
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sizeof(response));
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if (ret) {
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dev_err(&intf->dev,
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"failed to get control-protocol version: %d\n",
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ret);
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return ret;
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}
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if (response.major > request.major) {
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dev_err(&intf->dev,
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"unsupported major control-protocol version (%u > %u)\n",
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response.major, request.major);
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return -ENOTSUPP;
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}
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control->protocol_major = response.major;
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control->protocol_minor = response.minor;
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dev_dbg(&intf->dev, "%s - %u.%u\n", __func__, response.major,
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response.minor);
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return 0;
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}
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static int gb_control_get_bundle_version(struct gb_control *control,
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struct gb_bundle *bundle)
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{
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struct gb_interface *intf = control->connection->intf;
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struct gb_control_bundle_version_request request;
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struct gb_control_bundle_version_response response;
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int ret;
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request.bundle_id = bundle->id;
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ret = gb_operation_sync(control->connection,
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GB_CONTROL_TYPE_BUNDLE_VERSION,
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&request, sizeof(request),
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&response, sizeof(response));
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if (ret) {
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dev_err(&intf->dev,
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"failed to get bundle %u class version: %d\n",
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bundle->id, ret);
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return ret;
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}
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bundle->class_major = response.major;
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bundle->class_minor = response.minor;
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dev_dbg(&intf->dev, "%s - %u: %u.%u\n", __func__, bundle->id,
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response.major, response.minor);
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return 0;
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}
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int gb_control_get_bundle_versions(struct gb_control *control)
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{
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struct gb_interface *intf = control->connection->intf;
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struct gb_bundle *bundle;
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int ret;
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if (!control->has_bundle_version)
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return 0;
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list_for_each_entry(bundle, &intf->bundles, links) {
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ret = gb_control_get_bundle_version(control, bundle);
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if (ret)
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return ret;
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}
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return 0;
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}
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/* Get Manifest's size from the interface */
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int gb_control_get_manifest_size_operation(struct gb_interface *intf)
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{
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struct gb_control_get_manifest_size_response response;
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struct gb_connection *connection = intf->control->connection;
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int ret;
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ret = gb_operation_sync(connection, GB_CONTROL_TYPE_GET_MANIFEST_SIZE,
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NULL, 0, &response, sizeof(response));
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if (ret) {
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dev_err(&connection->intf->dev,
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"failed to get manifest size: %d\n", ret);
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return ret;
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}
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return le16_to_cpu(response.size);
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}
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/* Reads Manifest from the interface */
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int gb_control_get_manifest_operation(struct gb_interface *intf, void *manifest,
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size_t size)
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{
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struct gb_connection *connection = intf->control->connection;
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return gb_operation_sync(connection, GB_CONTROL_TYPE_GET_MANIFEST,
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NULL, 0, manifest, size);
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}
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int gb_control_connected_operation(struct gb_control *control, u16 cport_id)
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{
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struct gb_control_connected_request request;
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request.cport_id = cpu_to_le16(cport_id);
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return gb_operation_sync(control->connection, GB_CONTROL_TYPE_CONNECTED,
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&request, sizeof(request), NULL, 0);
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}
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int gb_control_disconnected_operation(struct gb_control *control, u16 cport_id)
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{
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struct gb_control_disconnected_request request;
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request.cport_id = cpu_to_le16(cport_id);
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return gb_operation_sync(control->connection,
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GB_CONTROL_TYPE_DISCONNECTED, &request,
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sizeof(request), NULL, 0);
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}
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int gb_control_disconnecting_operation(struct gb_control *control,
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u16 cport_id)
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{
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struct gb_control_disconnecting_request *request;
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struct gb_operation *operation;
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int ret;
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operation = gb_operation_create_core(control->connection,
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GB_CONTROL_TYPE_DISCONNECTING,
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sizeof(*request), 0, 0,
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GFP_KERNEL);
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if (!operation)
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return -ENOMEM;
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request = operation->request->payload;
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request->cport_id = cpu_to_le16(cport_id);
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ret = gb_operation_request_send_sync(operation);
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if (ret) {
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dev_err(&control->dev, "failed to send disconnecting: %d\n",
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ret);
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}
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gb_operation_put(operation);
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return ret;
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}
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int gb_control_mode_switch_operation(struct gb_control *control)
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{
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struct gb_operation *operation;
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int ret;
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operation = gb_operation_create_core(control->connection,
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GB_CONTROL_TYPE_MODE_SWITCH,
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0, 0,
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GB_OPERATION_FLAG_UNIDIRECTIONAL,
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GFP_KERNEL);
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if (!operation)
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return -ENOMEM;
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ret = gb_operation_request_send_sync(operation);
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if (ret)
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dev_err(&control->dev, "failed to send mode switch: %d\n", ret);
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gb_operation_put(operation);
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return ret;
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}
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static int gb_control_bundle_pm_status_map(u8 status)
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{
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switch (status) {
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case GB_CONTROL_BUNDLE_PM_INVAL:
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return -EINVAL;
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case GB_CONTROL_BUNDLE_PM_BUSY:
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return -EBUSY;
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case GB_CONTROL_BUNDLE_PM_NA:
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return -ENOMSG;
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case GB_CONTROL_BUNDLE_PM_FAIL:
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default:
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return -EREMOTEIO;
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}
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}
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int gb_control_bundle_suspend(struct gb_control *control, u8 bundle_id)
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{
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struct gb_control_bundle_pm_request request;
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struct gb_control_bundle_pm_response response;
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int ret;
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request.bundle_id = bundle_id;
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ret = gb_operation_sync(control->connection,
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GB_CONTROL_TYPE_BUNDLE_SUSPEND, &request,
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sizeof(request), &response, sizeof(response));
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if (ret) {
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dev_err(&control->dev, "failed to send bundle %u suspend: %d\n",
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bundle_id, ret);
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return ret;
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}
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if (response.status != GB_CONTROL_BUNDLE_PM_OK) {
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dev_err(&control->dev, "failed to suspend bundle %u: %d\n",
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bundle_id, response.status);
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return gb_control_bundle_pm_status_map(response.status);
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}
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return 0;
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}
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int gb_control_bundle_resume(struct gb_control *control, u8 bundle_id)
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{
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struct gb_control_bundle_pm_request request;
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struct gb_control_bundle_pm_response response;
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int ret;
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request.bundle_id = bundle_id;
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ret = gb_operation_sync(control->connection,
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GB_CONTROL_TYPE_BUNDLE_RESUME, &request,
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sizeof(request), &response, sizeof(response));
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if (ret) {
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dev_err(&control->dev, "failed to send bundle %u resume: %d\n",
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bundle_id, ret);
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return ret;
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}
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if (response.status != GB_CONTROL_BUNDLE_PM_OK) {
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dev_err(&control->dev, "failed to resume bundle %u: %d\n",
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bundle_id, response.status);
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return gb_control_bundle_pm_status_map(response.status);
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}
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return 0;
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}
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int gb_control_bundle_deactivate(struct gb_control *control, u8 bundle_id)
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{
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struct gb_control_bundle_pm_request request;
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struct gb_control_bundle_pm_response response;
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int ret;
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request.bundle_id = bundle_id;
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ret = gb_operation_sync(control->connection,
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GB_CONTROL_TYPE_BUNDLE_DEACTIVATE, &request,
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sizeof(request), &response, sizeof(response));
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if (ret) {
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dev_err(&control->dev,
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"failed to send bundle %u deactivate: %d\n", bundle_id,
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ret);
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return ret;
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}
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if (response.status != GB_CONTROL_BUNDLE_PM_OK) {
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dev_err(&control->dev, "failed to deactivate bundle %u: %d\n",
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bundle_id, response.status);
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return gb_control_bundle_pm_status_map(response.status);
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}
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return 0;
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}
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int gb_control_bundle_activate(struct gb_control *control, u8 bundle_id)
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{
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struct gb_control_bundle_pm_request request;
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struct gb_control_bundle_pm_response response;
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int ret;
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if (!control->has_bundle_activate)
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return 0;
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request.bundle_id = bundle_id;
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ret = gb_operation_sync(control->connection,
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GB_CONTROL_TYPE_BUNDLE_ACTIVATE, &request,
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sizeof(request), &response, sizeof(response));
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if (ret) {
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dev_err(&control->dev,
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"failed to send bundle %u activate: %d\n", bundle_id,
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ret);
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return ret;
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}
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if (response.status != GB_CONTROL_BUNDLE_PM_OK) {
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dev_err(&control->dev, "failed to activate bundle %u: %d\n",
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bundle_id, response.status);
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return gb_control_bundle_pm_status_map(response.status);
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}
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return 0;
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}
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static int gb_control_interface_pm_status_map(u8 status)
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{
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switch (status) {
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case GB_CONTROL_INTF_PM_BUSY:
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return -EBUSY;
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case GB_CONTROL_INTF_PM_NA:
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return -ENOMSG;
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default:
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return -EREMOTEIO;
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}
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}
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int gb_control_interface_suspend_prepare(struct gb_control *control)
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{
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struct gb_control_intf_pm_response response;
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int ret;
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ret = gb_operation_sync(control->connection,
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GB_CONTROL_TYPE_INTF_SUSPEND_PREPARE, NULL, 0,
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&response, sizeof(response));
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if (ret) {
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dev_err(&control->dev,
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"failed to send interface suspend prepare: %d\n", ret);
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return ret;
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}
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if (response.status != GB_CONTROL_INTF_PM_OK) {
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dev_err(&control->dev, "interface error while preparing suspend: %d\n",
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response.status);
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return gb_control_interface_pm_status_map(response.status);
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}
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return 0;
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}
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int gb_control_interface_deactivate_prepare(struct gb_control *control)
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{
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struct gb_control_intf_pm_response response;
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int ret;
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ret = gb_operation_sync(control->connection,
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GB_CONTROL_TYPE_INTF_DEACTIVATE_PREPARE, NULL,
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0, &response, sizeof(response));
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if (ret) {
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dev_err(&control->dev, "failed to send interface deactivate prepare: %d\n",
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ret);
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return ret;
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}
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if (response.status != GB_CONTROL_INTF_PM_OK) {
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dev_err(&control->dev, "interface error while preparing deactivate: %d\n",
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response.status);
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return gb_control_interface_pm_status_map(response.status);
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}
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return 0;
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}
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int gb_control_interface_hibernate_abort(struct gb_control *control)
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{
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struct gb_control_intf_pm_response response;
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int ret;
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ret = gb_operation_sync(control->connection,
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GB_CONTROL_TYPE_INTF_HIBERNATE_ABORT, NULL, 0,
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&response, sizeof(response));
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if (ret) {
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dev_err(&control->dev,
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"failed to send interface aborting hibernate: %d\n",
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ret);
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return ret;
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}
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if (response.status != GB_CONTROL_INTF_PM_OK) {
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dev_err(&control->dev, "interface error while aborting hibernate: %d\n",
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response.status);
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return gb_control_interface_pm_status_map(response.status);
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}
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return 0;
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}
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static ssize_t vendor_string_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct gb_control *control = to_gb_control(dev);
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return scnprintf(buf, PAGE_SIZE, "%s\n", control->vendor_string);
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}
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static DEVICE_ATTR_RO(vendor_string);
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static ssize_t product_string_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct gb_control *control = to_gb_control(dev);
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return scnprintf(buf, PAGE_SIZE, "%s\n", control->product_string);
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}
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static DEVICE_ATTR_RO(product_string);
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static struct attribute *control_attrs[] = {
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&dev_attr_vendor_string.attr,
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&dev_attr_product_string.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(control);
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static void gb_control_release(struct device *dev)
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{
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struct gb_control *control = to_gb_control(dev);
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gb_connection_destroy(control->connection);
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kfree(control->vendor_string);
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kfree(control->product_string);
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kfree(control);
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}
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struct device_type greybus_control_type = {
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.name = "greybus_control",
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.release = gb_control_release,
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};
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struct gb_control *gb_control_create(struct gb_interface *intf)
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{
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struct gb_connection *connection;
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struct gb_control *control;
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control = kzalloc(sizeof(*control), GFP_KERNEL);
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if (!control)
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return ERR_PTR(-ENOMEM);
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control->intf = intf;
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connection = gb_connection_create_control(intf);
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if (IS_ERR(connection)) {
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dev_err(&intf->dev,
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"failed to create control connection: %ld\n",
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PTR_ERR(connection));
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kfree(control);
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return ERR_CAST(connection);
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}
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control->connection = connection;
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control->dev.parent = &intf->dev;
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control->dev.bus = &greybus_bus_type;
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control->dev.type = &greybus_control_type;
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control->dev.groups = control_groups;
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control->dev.dma_mask = intf->dev.dma_mask;
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device_initialize(&control->dev);
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dev_set_name(&control->dev, "%s.ctrl", dev_name(&intf->dev));
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gb_connection_set_data(control->connection, control);
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return control;
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}
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int gb_control_enable(struct gb_control *control)
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{
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int ret;
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dev_dbg(&control->connection->intf->dev, "%s\n", __func__);
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ret = gb_connection_enable_tx(control->connection);
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if (ret) {
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dev_err(&control->connection->intf->dev,
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"failed to enable control connection: %d\n",
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ret);
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return ret;
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}
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ret = gb_control_get_version(control);
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if (ret)
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goto err_disable_connection;
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if (control->protocol_major > 0 || control->protocol_minor > 1)
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control->has_bundle_version = true;
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/* FIXME: use protocol version instead */
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if (!(control->intf->quirks & GB_INTERFACE_QUIRK_NO_BUNDLE_ACTIVATE))
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control->has_bundle_activate = true;
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return 0;
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err_disable_connection:
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gb_connection_disable(control->connection);
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return ret;
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}
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void gb_control_disable(struct gb_control *control)
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{
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dev_dbg(&control->connection->intf->dev, "%s\n", __func__);
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if (control->intf->disconnected)
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gb_connection_disable_forced(control->connection);
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else
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gb_connection_disable(control->connection);
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}
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int gb_control_suspend(struct gb_control *control)
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{
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gb_connection_disable(control->connection);
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return 0;
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}
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int gb_control_resume(struct gb_control *control)
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{
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int ret;
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ret = gb_connection_enable_tx(control->connection);
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if (ret) {
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dev_err(&control->connection->intf->dev,
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"failed to enable control connection: %d\n", ret);
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return ret;
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}
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return 0;
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}
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int gb_control_add(struct gb_control *control)
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{
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int ret;
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ret = device_add(&control->dev);
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if (ret) {
|
|
dev_err(&control->dev,
|
|
"failed to register control device: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void gb_control_del(struct gb_control *control)
|
|
{
|
|
if (device_is_registered(&control->dev))
|
|
device_del(&control->dev);
|
|
}
|
|
|
|
struct gb_control *gb_control_get(struct gb_control *control)
|
|
{
|
|
get_device(&control->dev);
|
|
|
|
return control;
|
|
}
|
|
|
|
void gb_control_put(struct gb_control *control)
|
|
{
|
|
put_device(&control->dev);
|
|
}
|
|
|
|
void gb_control_mode_switch_prepare(struct gb_control *control)
|
|
{
|
|
gb_connection_mode_switch_prepare(control->connection);
|
|
}
|
|
|
|
void gb_control_mode_switch_complete(struct gb_control *control)
|
|
{
|
|
gb_connection_mode_switch_complete(control->connection);
|
|
}
|