135 lines
3.3 KiB
C
135 lines
3.3 KiB
C
/*
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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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* Released under the GPLv2 only.
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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 "greybus.h"
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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->dev,
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"%s: Manifest size get operation failed (%d)\n",
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__func__, 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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static int gb_control_request_recv(u8 type, struct gb_operation *op)
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{
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struct gb_connection *connection = op->connection;
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struct gb_protocol_version_response *version;
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switch (type) {
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case GB_CONTROL_TYPE_PROBE_AP:
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// TODO
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// Send authenticated block of data, confirming this module is
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// an AP.
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break;
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case GB_REQUEST_TYPE_PROTOCOL_VERSION:
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if (!gb_operation_response_alloc(op, sizeof(*version),
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GFP_KERNEL)) {
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dev_err(&connection->dev,
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"%s: error allocating response\n", __func__);
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return -ENOMEM;
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}
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version = op->response->payload;
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version->major = GB_CONTROL_VERSION_MAJOR;
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version->minor = GB_CONTROL_VERSION_MINOR;
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break;
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case GB_CONTROL_TYPE_CONNECTED:
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case GB_CONTROL_TYPE_DISCONNECTED:
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break;
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default:
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WARN_ON(1);
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break;
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}
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return 0;
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}
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static int gb_control_connection_init(struct gb_connection *connection)
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{
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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 -ENOMEM;
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control->connection = connection;
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connection->private = control;
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/* Set interface's control connection */
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connection->bundle->intf->control = control;
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return 0;
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}
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static void gb_control_connection_exit(struct gb_connection *connection)
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{
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struct gb_control *control = connection->private;
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if (WARN_ON(connection->bundle->intf->control != control))
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return;
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connection->bundle->intf->control = NULL;
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kfree(control);
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}
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static struct gb_protocol control_protocol = {
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.name = "control",
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.id = GREYBUS_PROTOCOL_CONTROL,
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.major = 0,
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.minor = 1,
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.connection_init = gb_control_connection_init,
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.connection_exit = gb_control_connection_exit,
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.request_recv = gb_control_request_recv,
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};
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gb_builtin_protocol_driver(control_protocol);
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