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firewire: cdev: add ioctl for broadcast write requests

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Write transactions to the broadcast node ID are a convenient way to
trigger functions of multiple nodes at once.  IIDC is a protocol which
can make use of this if multiple cameras with same command_regs_base are
connected at the same bus.

Based on
    Date: Wed, 10 Sep 2008 11:32:16 -0400
    From: Jay Fenlason <fenlason@redhat.com>
    Subject: [patch] SEND_BROADCAST_REQUEST
Changes:  ioctl_send_request() and ioctl_send_broadcast_request() now
share code.  Broadcast speed corrected to S100.  Check for proper tcode.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Jay Fenlason, Stefan Richter 2009-01-04 16:23:29 +01:00 committed by Stefan Richter
parent 33580a3ef5
commit acfe833357
2 changed files with 51 additions and 30 deletions
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80
drivers/firewire/fw-cdev.c
View file

@ -518,10 +518,10 @@ static void complete_transaction(struct fw_card *card, int rcode,
client_put(client);
}
static int ioctl_send_request(struct client *client, void *buffer)
static int init_request(struct client *client,
struct fw_cdev_send_request *request,
int destination_id, int speed)
{
struct fw_device *device = client->device;
struct fw_cdev_send_request *request = buffer;
struct outbound_transaction_event *e;
int ret;
@ -544,6 +544,34 @@ static int ioctl_send_request(struct client *client, void *buffer)
goto failed;
}
e->r.resource.release = release_transaction;
ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
if (ret < 0)
goto failed;
/* Get a reference for the transaction callback */
client_get(client);
fw_send_request(client->device->card, &e->r.transaction,
request->tcode & 0x1f, destination_id,
request->generation, speed, request->offset,
e->response.data, request->length,
complete_transaction, e);
if (request->data)
return sizeof(request) + request->length;
else
return sizeof(request);
failed:
kfree(e);
return ret;
}
static int ioctl_send_request(struct client *client, void *buffer)
{
struct fw_cdev_send_request *request = buffer;
switch (request->tcode) {
case TCODE_WRITE_QUADLET_REQUEST:
case TCODE_WRITE_BLOCK_REQUEST:
@ -558,35 +586,11 @@ static int ioctl_send_request(struct client *client, void *buffer)
case TCODE_LOCK_VENDOR_DEPENDENT:
break;
default:
ret = -EINVAL;
goto failed;
return -EINVAL;
}
e->r.resource.release = release_transaction;
ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
if (ret < 0)
goto failed;
/* Get a reference for the transaction callback */
client_get(client);
fw_send_request(device->card, &e->r.transaction,
request->tcode & 0x1f,
device->node->node_id,
request->generation,
device->max_speed,
request->offset,
e->response.data, request->length,
complete_transaction, e);
if (request->data)
return sizeof(request) + request->length;
else
return sizeof(request);
failed:
kfree(e);
return ret;
return init_request(client, request, client->device->node->node_id,
client->device->max_speed);
}
static void release_request(struct client *client,
@ -1229,6 +1233,21 @@ static int ioctl_get_speed(struct client *client, void *buffer)
return 0;
}
static int ioctl_send_broadcast_request(struct client *client, void *buffer)
{
struct fw_cdev_send_request *request = buffer;
switch (request->tcode) {
case TCODE_WRITE_QUADLET_REQUEST:
case TCODE_WRITE_BLOCK_REQUEST:
break;
default:
return -EINVAL;
}
return init_request(client, request, LOCAL_BUS | 0x3f, SCODE_100);
}
static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
ioctl_get_info,
ioctl_send_request,
@ -1248,6 +1267,7 @@ static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
ioctl_allocate_iso_resource_once,
ioctl_deallocate_iso_resource_once,
ioctl_get_speed,
ioctl_send_broadcast_request,
};
static int dispatch_ioctl(struct client *client,

1
include/linux/firewire-cdev.h
View file

@ -230,6 +230,7 @@ union fw_cdev_event {
#define FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE _IOW('#', 0x0f, struct fw_cdev_allocate_iso_resource)
#define FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE_ONCE _IOW('#', 0x10, struct fw_cdev_allocate_iso_resource)
#define FW_CDEV_IOC_GET_SPEED _IOR('#', 0x11, struct fw_cdev_get_speed)
#define FW_CDEV_IOC_SEND_BROADCAST_REQUEST _IOW('#', 0x12, struct fw_cdev_send_request)
/* FW_CDEV_VERSION History
*