+++ /dev/null
-/*
- * Greybus "AP" message loop handling
- *
- * Copyright 2014 Google Inc.
- * Copyright 2014 Linaro Ltd.
- *
- * Released under the GPLv2 only.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/types.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/uaccess.h>
-#include <linux/workqueue.h>
-#include <linux/device.h>
-#include "svc_msg.h"
-#include "greybus_manifest.h"
-#include "greybus.h"
-
-struct ap_msg {
- u8 *data;
- size_t size;
- struct greybus_host_device *hd;
- struct work_struct event;
-};
-
-static struct workqueue_struct *ap_workqueue;
-
-static struct svc_msg *svc_msg_alloc(enum svc_function_id id)
-{
- struct svc_msg *svc_msg;
-
- svc_msg = kzalloc((sizeof *svc_msg), GFP_KERNEL);
- if (!svc_msg)
- return NULL;
-
- // FIXME - verify we are only sending function IDs we should be
- svc_msg->header.function_id = id;
- return svc_msg;
-}
-
-static void svc_msg_free(struct svc_msg *svc_msg)
-{
- kfree(svc_msg);
-}
-
-static int svc_msg_send(struct svc_msg *svc_msg, struct greybus_host_device *hd)
-{
- int retval;
-
- // FIXME - Do we need to do more than just pass it to the hd and then
- // free it?
- retval = hd->driver->submit_svc(svc_msg, hd);
-
- svc_msg_free(svc_msg);
- return retval;
-}
-
-static void svc_handshake(struct svc_function_handshake *handshake,
- int payload_length, struct greybus_host_device *hd)
-{
- struct svc_msg *svc_msg;
-
- if (payload_length != sizeof(*handshake)) {
- dev_err(hd->parent,
- "Illegal size of svc handshake message %d\n",
- payload_length);
- return;
- }
-
- /* A new SVC communication channel, let's verify a supported version */
- if ((handshake->version_major != GREYBUS_VERSION_MAJOR) ||
- (handshake->version_minor != GREYBUS_VERSION_MINOR)) {
- dev_warn(hd->parent,
- "received invalid greybus version %u.%u\n",
- handshake->version_major, handshake->version_minor);
- return;
- }
-
- /* Validate that the handshake came from the SVC */
- if (handshake->handshake_type != SVC_HANDSHAKE_SVC_HELLO) {
- /* we don't know what to do with this, log it and return */
- dev_dbg(hd->parent, "received invalid handshake type %d\n",
- handshake->handshake_type);
- return;
- }
-
- /* Send back a AP_HELLO message */
- svc_msg = svc_msg_alloc(SVC_FUNCTION_HANDSHAKE);
- if (!svc_msg)
- return;
-
- svc_msg->header.message_type = SVC_MSG_DATA;
- svc_msg->header.payload_length =
- cpu_to_le16(sizeof(*handshake));
- svc_msg->handshake.version_major = GREYBUS_VERSION_MAJOR;
- svc_msg->handshake.version_minor = GREYBUS_VERSION_MINOR;
- svc_msg->handshake.handshake_type = SVC_HANDSHAKE_AP_HELLO;
-
- (void)svc_msg_send(svc_msg, hd);
-}
-
-static void svc_management(struct svc_function_unipro_management *management,
- int payload_length, struct greybus_host_device *hd)
-{
- struct gb_interface *intf;
- int ret;
-
- if (payload_length != sizeof(*management)) {
- dev_err(hd->parent,
- "Illegal size of svc management message %d\n",
- payload_length);
- return;
- }
-
- switch (management->management_packet_type) {
- case SVC_MANAGEMENT_AP_ID:
- hd->device_id = management->ap_id.device_id;
- break;
- case SVC_MANAGEMENT_LINK_UP:
- intf = gb_interface_find(hd, management->link_up.interface_id);
- if (!intf) {
- dev_err(hd->parent, "Interface ID %d not found\n",
- management->link_up.interface_id);
- return;
- }
- ret = gb_interface_init(intf, management->link_up.device_id);
- if (ret) {
- dev_err(hd->parent,
- "error %d initializing interface %hhu\n",
- ret, management->link_up.interface_id);
- return;
- }
- break;
- default:
- dev_err(hd->parent, "Unhandled UniPro management message\n");
- }
-}
-
-static void svc_hotplug(struct svc_function_hotplug *hotplug,
- int payload_length, struct greybus_host_device *hd)
-{
- u8 interface_id = hotplug->interface_id;
-
- switch (hotplug->hotplug_event) {
- case SVC_HOTPLUG_EVENT:
- /* Add a new interface to the system */
- if (payload_length != sizeof(*hotplug)) {
- dev_err(hd->parent,
- "Illegal size of svc hotplug message %d\n",
- payload_length);
- return;
- }
- dev_dbg(hd->parent, "interface id %d added\n", interface_id);
- gb_interface_create(hd, interface_id);
- break;
-
- case SVC_HOTUNPLUG_EVENT:
- /* Remove a interface from the system */
- if (payload_length != sizeof(*hotplug)) {
- dev_err(hd->parent,
- "Illegal size of svc hotunplug message %d\n",
- payload_length);
- return;
- }
- dev_dbg(hd->parent, "interface id %d removed\n", interface_id);
- gb_interface_remove(hd, interface_id);
- break;
-
- default:
- dev_err(hd->parent,
- "Received invalid hotplug message type %d\n",
- hotplug->hotplug_event);
- break;
- }
-}
-
-static void svc_power(struct svc_function_power *power,
- int payload_length, struct greybus_host_device *hd)
-{
- u8 interface_id = power->interface_id;
-
- /*
- * The AP is only allowed to get a Battery Status message, not a Battery
- * Status Request
- */
- if (power->power_type != SVC_POWER_BATTERY_STATUS) {
- dev_err(hd->parent, "Received invalid power type %d\n",
- power->power_type);
- return;
- }
-
- /*
- * As struct struct svc_function_power_battery_status_request is 0 bytes
- * big, we can just check the union of the whole structure to validate
- * the size of this message.
- */
- if (payload_length != sizeof(*power)) {
- dev_err(hd->parent,
- "Illegal size of svc power message %d\n",
- payload_length);
- return;
- }
-
- dev_dbg(hd->parent, "power status for interface id %d is %d\n",
- interface_id, power->status.status);
-
- // FIXME - do something with the power information, like update our
- // battery information...
-}
-
-static void svc_epm(struct svc_function_epm *epm,
- int payload_length, struct greybus_host_device *hd)
-{
- /* What? An AP should not get this message */
- dev_err(hd->parent, "Got an EPM message???\n");
-}
-
-static void svc_suspend(struct svc_function_suspend *suspend,
- int payload_length, struct greybus_host_device *hd)
-{
- /* What? An AP should not get this message */
- dev_err(hd->parent, "Got an suspend message???\n");
-}
-
-static struct svc_msg *convert_ap_message(struct ap_msg *ap_msg)
-{
- struct svc_msg *svc_msg;
- struct svc_msg_header *header;
- struct greybus_host_device *hd = ap_msg->hd;
-
- svc_msg = (struct svc_msg *)ap_msg->data;
- header = &svc_msg->header;
-
- /* Validate the message type */
- if (header->message_type != SVC_MSG_DATA) {
- dev_err(hd->parent, "message type %d received?\n",
- header->message_type);
- return NULL;
- }
-
- /*
- * The validation of the size of the message buffer happens in each
- * svc_* function, due to the different types of messages, keeping the
- * logic for each message only in one place.
- */
-
- return svc_msg;
-}
-
-static void ap_process_event(struct work_struct *work)
-{
- struct svc_msg *svc_msg;
- struct greybus_host_device *hd;
- struct ap_msg *ap_msg;
- int payload_length;
-
- ap_msg = container_of(work, struct ap_msg, event);
- hd = ap_msg->hd;
-
- /* Turn the "raw" data into a real message */
- svc_msg = convert_ap_message(ap_msg);
- if (!svc_msg)
- return;
-
- payload_length = le16_to_cpu(svc_msg->header.payload_length);
-
- /* Look at the message to figure out what to do with it */
- switch (svc_msg->header.function_id) {
- case SVC_FUNCTION_HANDSHAKE:
- svc_handshake(&svc_msg->handshake, payload_length, hd);
- break;
- case SVC_FUNCTION_UNIPRO_NETWORK_MANAGEMENT:
- svc_management(&svc_msg->management, payload_length, hd);
- break;
- case SVC_FUNCTION_HOTPLUG:
- svc_hotplug(&svc_msg->hotplug, payload_length, hd);
- break;
- case SVC_FUNCTION_POWER:
- svc_power(&svc_msg->power, payload_length, hd);
- break;
- case SVC_FUNCTION_EPM:
- svc_epm(&svc_msg->epm, payload_length, hd);
- break;
- case SVC_FUNCTION_SUSPEND:
- svc_suspend(&svc_msg->suspend, payload_length, hd);
- break;
- default:
- dev_err(hd->parent, "received invalid SVC function ID %d\n",
- svc_msg->header.function_id);
- }
-
- /* clean the message up */
- kfree(ap_msg->data);
- kfree(ap_msg);
-}
-
-int greybus_svc_in(struct greybus_host_device *hd, u8 *data, int size)
-{
- struct ap_msg *ap_msg;
-
- /*
- * Totally naive copy the message into a new structure that we slowly
- * create and add it to the list. Let's get this working, the odds of
- * this being any "slow path" for AP messages is really low at this
- * point in time, but you never know, so this comment is here to point
- * out that maybe we should use a slab allocator, or even just not copy
- * the data, but use it directly and force the urbs to be "new" each
- * time.
- */
-
- /* Note - this can, and will, be called in interrupt context. */
- ap_msg = kmalloc(sizeof(*ap_msg), GFP_ATOMIC);
- if (!ap_msg)
- return -ENOMEM;
- ap_msg->data = kmalloc(size, GFP_ATOMIC);
- if (!ap_msg->data) {
- kfree(ap_msg);
- return -ENOMEM;
- }
- memcpy(ap_msg->data, data, size);
- ap_msg->size = size;
- ap_msg->hd = hd;
-
- INIT_WORK(&ap_msg->event, ap_process_event);
- queue_work(ap_workqueue, &ap_msg->event);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(greybus_svc_in);
-
-int __init gb_ap_init(void)
-{
- ap_workqueue = alloc_ordered_workqueue("greybus_ap", 0);
- if (!ap_workqueue)
- return -ENOMEM;
-
- return 0;
-}
-
-void gb_ap_exit(void)
-{
- destroy_workqueue(ap_workqueue);
- ap_workqueue = NULL;
-}
-
-
projects / mirror_ubuntu-bionic-kernel.git / commitdiff