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authorStefan Richter <stefanr@s5r6.in-berlin.de>2009-01-04 10:23:29 -0500
committerStefan Richter <stefanr@s5r6.in-berlin.de>2009-03-24 15:56:44 -0400
commit33580a3ef5ba3bc0ee1b520df82a24bb37ce28f0 (patch)
tree3bd567d8c5244a049eef32147f4fb84f6a19a184 /drivers/firewire/fw-cdev.c
parent1ec3c0269d7196118cc7c403654ca5f19ef4d584 (diff)
firewire: cdev: add ioctl to query maximum transmission speed
While the speed of asynchronous transactions is automatically chosen by the kernel, the speed of isochronous streams has to be chosen by the initiating client. In case of 1394a bus topologies, the maximum possible speed could be figured out with some effort by evaluation of the remote node's link speed field in the config ROM, the local node's link speed field, and the PHY speeds and topologic information in the local node's or IRM's topology map CSR. However, this does not work in case of 1394b buses. Hence add an ioctl to export the maximum speed which the kernel already determined. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire/fw-cdev.c')
-rw-r--r--drivers/firewire/fw-cdev.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c
index 08fe68d34f3..05ad2a8f286 100644
--- a/drivers/firewire/fw-cdev.c
+++ b/drivers/firewire/fw-cdev.c
@@ -1220,6 +1220,15 @@ static int ioctl_deallocate_iso_resource_once(struct client *client, void *buffe
1220 return init_iso_resource(client, request, ISO_RES_DEALLOC_ONCE); 1220 return init_iso_resource(client, request, ISO_RES_DEALLOC_ONCE);
1221} 1221}
1222 1222
1223static int ioctl_get_speed(struct client *client, void *buffer)
1224{
1225 struct fw_cdev_get_speed *request = buffer;
1226
1227 request->max_speed = client->device->max_speed;
1228
1229 return 0;
1230}
1231
1223static int (* const ioctl_handlers[])(struct client *client, void *buffer) = { 1232static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
1224 ioctl_get_info, 1233 ioctl_get_info,
1225 ioctl_send_request, 1234 ioctl_send_request,
@@ -1238,6 +1247,7 @@ static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
1238 ioctl_deallocate_iso_resource, 1247 ioctl_deallocate_iso_resource,
1239 ioctl_allocate_iso_resource_once, 1248 ioctl_allocate_iso_resource_once,
1240 ioctl_deallocate_iso_resource_once, 1249 ioctl_deallocate_iso_resource_once,
1250 ioctl_get_speed,
1241}; 1251};
1242 1252
1243static int dispatch_ioctl(struct client *client, 1253static int dispatch_ioctl(struct client *client,