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greybus: svc: implement interface mailbox event 

Implement the new interface mailbox-event operation.

The event is sent by the SVC under certain conditions when an interface
updates its mailbox value. Specifically, this event will be used to
implement the new mode-switch functionality.

Upon reception the AP verifies that the interface is known and that the
mailbox has the expected MAILBOX_GREYBUS value. If so, the interface is
disabled before being re-enabled (re-enumerated).

Note that during mode-switch, the interface will typically already be in
a disabled state when the mailbox is written (with the ES3 bootrom being
the notable exception).

Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Johan Hovold 2016-04-23 18:47:31 +02:00 committed by Greg Kroah-Hartman
parent 22bb9380d6
commit b482b0d6f0
2 changed files with 109 additions and 0 deletions
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13
drivers/staging/greybus/greybus_protocols.h
View File

@ -805,6 +805,7 @@ struct gb_spi_transfer_response {
#define GB_SVC_TYPE_MODULE_INSERTED 0x1f
#define GB_SVC_TYPE_MODULE_REMOVED 0x20
#define GB_SVC_TYPE_INTF_ACTIVATE 0x27
#define GB_SVC_TYPE_INTF_MAILBOX_EVENT 0x29
/*
* SVC version request/response has the same payload as
@ -1038,6 +1039,18 @@ struct gb_svc_intf_activate_response {
__u8 intf_type;
} __packed;
#define GB_SVC_INTF_MAILBOX_NONE 0x00
#define GB_SVC_INTF_MAILBOX_AP 0x01
#define GB_SVC_INTF_MAILBOX_GREYBUS 0x02
struct gb_svc_intf_mailbox_event_request {
__u8 intf_id;
__le16 result_code;
__le32 mailbox;
} __packed;
/* intf_mailbox_event response has no payload */
/* RAW */
/* Version of the Greybus raw protocol we support */

96
drivers/staging/greybus/svc.c
View File

@ -695,6 +695,27 @@ static int gb_svc_hello(struct gb_operation *op)
return 0;
}
static struct gb_interface *gb_svc_interface_lookup(struct gb_svc *svc,
u8 intf_id)
{
struct gb_host_device *hd = svc->hd;
struct gb_module *module;
size_t num_interfaces;
u8 module_id;
list_for_each_entry(module, &hd->modules, hd_node) {
module_id = module->module_id;
num_interfaces = module->num_interfaces;
if (intf_id >= module_id &&
intf_id < module_id + num_interfaces) {
return module->interfaces[intf_id - module_id];
}
}
return NULL;
}
static struct gb_module *gb_svc_module_lookup(struct gb_svc *svc, u8 module_id)
{
struct gb_host_device *hd = svc->hd;
@ -874,6 +895,58 @@ static void gb_svc_process_module_removed(struct gb_operation *operation)
gb_module_put(module);
}
static void gb_svc_process_intf_mailbox_event(struct gb_operation *operation)
{
struct gb_svc_intf_mailbox_event_request *request;
struct gb_connection *connection = operation->connection;
struct gb_svc *svc = gb_connection_get_data(connection);
struct gb_interface *intf;
u8 intf_id;
u16 result_code;
u32 mailbox;
/* The request message size has already been verified. */
request = operation->request->payload;
intf_id = request->intf_id;
result_code = le16_to_cpu(request->result_code);
mailbox = le32_to_cpu(request->mailbox);
dev_dbg(&svc->dev, "%s - id = %u, result = 0x%04x, mailbox = 0x%08x\n",
__func__, intf_id, result_code, mailbox);
intf = gb_svc_interface_lookup(svc, intf_id);
if (!intf) {
dev_warn(&svc->dev, "unexpected mailbox event %u\n", intf_id);
return;
}
if (result_code) {
dev_warn(&svc->dev,
"mailbox event %u with UniPro error: 0x%04x\n",
intf_id, result_code);
goto err_disable_interface;
}
if (mailbox != GB_SVC_INTF_MAILBOX_GREYBUS) {
dev_warn(&svc->dev,
"mailbox event %u with unexected value: 0x%08x\n",
intf_id, mailbox);
goto err_disable_interface;
}
dev_info(&svc->dev, "mode switch detected on interface %u\n", intf_id);
gb_svc_intf_reenable(svc, intf);
return;
err_disable_interface:
mutex_lock(&intf->mutex);
gb_interface_disable(intf);
gb_interface_deactivate(intf);
mutex_unlock(&intf->mutex);
}
static void gb_svc_process_deferred_request(struct work_struct *work)
{
struct gb_svc_deferred_request *dr;
@ -899,6 +972,9 @@ static void gb_svc_process_deferred_request(struct work_struct *work)
case GB_SVC_TYPE_MODULE_REMOVED:
gb_svc_process_module_removed(operation);
break;
case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
gb_svc_process_intf_mailbox_event(operation);
break;
default:
dev_err(&svc->dev, "bad deferred request type: 0x%02x\n", type);
}
@ -1077,6 +1153,24 @@ static int gb_svc_module_removed_recv(struct gb_operation *op)
return gb_svc_queue_deferred_request(op);
}
static int gb_svc_intf_mailbox_event_recv(struct gb_operation *op)
{
struct gb_svc *svc = gb_connection_get_data(op->connection);
struct gb_svc_intf_mailbox_event_request *request;
if (op->request->payload_size < sizeof(*request)) {
dev_warn(&svc->dev, "short mailbox request received (%zu < %zu)\n",
op->request->payload_size, sizeof(*request));
return -EINVAL;
}
request = op->request->payload;
dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id);
return gb_svc_queue_deferred_request(op);
}
static int gb_svc_request_handler(struct gb_operation *op)
{
struct gb_connection *connection = op->connection;
@ -1138,6 +1232,8 @@ static int gb_svc_request_handler(struct gb_operation *op)
return gb_svc_module_inserted_recv(op);
case GB_SVC_TYPE_MODULE_REMOVED:
return gb_svc_module_removed_recv(op);
case GB_SVC_TYPE_INTF_MAILBOX_EVENT:
return gb_svc_intf_mailbox_event_recv(op);
default:
dev_warn(&svc->dev, "unsupported request 0x%02x\n", type);
return -EINVAL;