| /* |
| * Greybus CPort control protocol. |
| * |
| * Copyright 2015 Google Inc. |
| * Copyright 2015 Linaro Ltd. |
| * |
| * Released under the GPLv2 only. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include "greybus.h" |
| |
| /* Highest control-protocol version supported */ |
| #define GB_CONTROL_VERSION_MAJOR 0 |
| #define GB_CONTROL_VERSION_MINOR 1 |
| |
| |
| static int gb_control_get_version(struct gb_control *control) |
| { |
| struct gb_interface *intf = control->connection->intf; |
| struct gb_control_version_request request; |
| struct gb_control_version_response response; |
| int ret; |
| |
| request.major = GB_CONTROL_VERSION_MAJOR; |
| request.minor = GB_CONTROL_VERSION_MINOR; |
| |
| ret = gb_operation_sync(control->connection, |
| GB_CONTROL_TYPE_VERSION, |
| &request, sizeof(request), &response, |
| sizeof(response)); |
| if (ret) { |
| dev_err(&intf->dev, |
| "failed to get control-protocol version: %d\n", |
| ret); |
| return ret; |
| } |
| |
| if (response.major > request.major) { |
| dev_err(&intf->dev, |
| "unsupported major control-protocol version (%u > %u)\n", |
| response.major, request.major); |
| return -ENOTSUPP; |
| } |
| |
| control->protocol_major = response.major; |
| control->protocol_minor = response.minor; |
| |
| dev_dbg(&intf->dev, "%s - %u.%u\n", __func__, response.major, |
| response.minor); |
| |
| return 0; |
| } |
| |
| static int gb_control_get_bundle_version(struct gb_control *control, |
| struct gb_bundle *bundle) |
| { |
| struct gb_interface *intf = control->connection->intf; |
| struct gb_control_bundle_version_request request; |
| struct gb_control_bundle_version_response response; |
| int ret; |
| |
| request.bundle_id = bundle->id; |
| |
| ret = gb_operation_sync(control->connection, |
| GB_CONTROL_TYPE_BUNDLE_VERSION, |
| &request, sizeof(request), |
| &response, sizeof(response)); |
| if (ret) { |
| dev_err(&intf->dev, |
| "failed to get bundle %u class version: %d\n", |
| bundle->id, ret); |
| return ret; |
| } |
| |
| bundle->class_major = response.major; |
| bundle->class_minor = response.minor; |
| |
| dev_dbg(&intf->dev, "%s - %u: %u.%u\n", __func__, bundle->id, |
| response.major, response.minor); |
| |
| return 0; |
| } |
| |
| int gb_control_get_bundle_versions(struct gb_control *control) |
| { |
| struct gb_interface *intf = control->connection->intf; |
| struct gb_bundle *bundle; |
| int ret; |
| |
| if (!control->has_bundle_version) |
| return 0; |
| |
| list_for_each_entry(bundle, &intf->bundles, links) { |
| ret = gb_control_get_bundle_version(control, bundle); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /* Get Manifest's size from the interface */ |
| int gb_control_get_manifest_size_operation(struct gb_interface *intf) |
| { |
| struct gb_control_get_manifest_size_response response; |
| struct gb_connection *connection = intf->control->connection; |
| int ret; |
| |
| ret = gb_operation_sync(connection, GB_CONTROL_TYPE_GET_MANIFEST_SIZE, |
| NULL, 0, &response, sizeof(response)); |
| if (ret) { |
| dev_err(&connection->intf->dev, |
| "failed to get manifest size: %d\n", ret); |
| return ret; |
| } |
| |
| return le16_to_cpu(response.size); |
| } |
| |
| /* Reads Manifest from the interface */ |
| int gb_control_get_manifest_operation(struct gb_interface *intf, void *manifest, |
| size_t size) |
| { |
| struct gb_connection *connection = intf->control->connection; |
| |
| return gb_operation_sync(connection, GB_CONTROL_TYPE_GET_MANIFEST, |
| NULL, 0, manifest, size); |
| } |
| |
| int gb_control_connected_operation(struct gb_control *control, u16 cport_id) |
| { |
| struct gb_control_connected_request request; |
| |
| request.cport_id = cpu_to_le16(cport_id); |
| return gb_operation_sync(control->connection, GB_CONTROL_TYPE_CONNECTED, |
| &request, sizeof(request), NULL, 0); |
| } |
| |
| int gb_control_disconnected_operation(struct gb_control *control, u16 cport_id) |
| { |
| struct gb_control_disconnected_request request; |
| |
| request.cport_id = cpu_to_le16(cport_id); |
| return gb_operation_sync(control->connection, |
| GB_CONTROL_TYPE_DISCONNECTED, &request, |
| sizeof(request), NULL, 0); |
| } |
| |
| int gb_control_get_interface_version_operation(struct gb_interface *intf) |
| { |
| struct gb_control_interface_version_response response; |
| struct gb_connection *connection = intf->control->connection; |
| int ret; |
| |
| /* The ES3 bootrom fails to boot if this request it sent to it */ |
| if (intf->boot_over_unipro) |
| return 0; |
| |
| ret = gb_operation_sync(connection, GB_CONTROL_TYPE_INTERFACE_VERSION, |
| NULL, 0, &response, sizeof(response)); |
| if (ret) { |
| dev_err(&connection->intf->dev, |
| "failed to get interface version: %d\n", ret); |
| /* |
| * FIXME: Return success until the time we bump version of |
| * control protocol. The interface-version is already set to |
| * 0.0, so no need to update that. |
| */ |
| return 0; |
| } |
| |
| intf->version_major = le16_to_cpu(response.major); |
| intf->version_minor = le16_to_cpu(response.minor); |
| |
| return 0; |
| } |
| |
| struct gb_control *gb_control_create(struct gb_interface *intf) |
| { |
| struct gb_control *control; |
| |
| control = kzalloc(sizeof(*control), GFP_KERNEL); |
| if (!control) |
| return NULL; |
| |
| control->connection = gb_connection_create_control(intf); |
| if (IS_ERR(control->connection)) { |
| dev_err(&intf->dev, |
| "failed to create control connection: %ld\n", |
| PTR_ERR(control->connection)); |
| kfree(control); |
| return NULL; |
| } |
| |
| control->connection->private = control; |
| |
| return control; |
| } |
| |
| int gb_control_enable(struct gb_control *control) |
| { |
| int ret; |
| |
| dev_dbg(&control->connection->intf->dev, "%s\n", __func__); |
| |
| ret = gb_connection_enable_tx(control->connection); |
| if (ret) { |
| dev_err(&control->connection->intf->dev, |
| "failed to enable control connection: %d\n", |
| ret); |
| return ret; |
| } |
| |
| ret = gb_control_get_version(control); |
| if (ret) |
| goto err_disable_connection; |
| |
| if (control->protocol_major > 0 || control->protocol_minor > 1) |
| control->has_bundle_version = true; |
| |
| return 0; |
| |
| err_disable_connection: |
| gb_connection_disable(control->connection); |
| |
| return ret; |
| } |
| |
| void gb_control_disable(struct gb_control *control) |
| { |
| dev_dbg(&control->connection->intf->dev, "%s\n", __func__); |
| |
| gb_connection_disable(control->connection); |
| } |
| |
| void gb_control_destroy(struct gb_control *control) |
| { |
| gb_connection_destroy(control->connection); |
| kfree(control); |
| } |