firewire: Generalize get_config_rom to get_info.

Repurpose the get_config_rom ioctl to a general get_info ioctl.
This ioctl is now used for version negotiation, and optionally
returns the config rom, and the current bus info.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 27 insertions, 4 deletions

diff --git a/drivers/firewire/fw-device-cdev.h b/drivers/firewire/fw-device-cdev.h
index 8a8b390d5996..c6ea6f32a94b 100644
--- a/drivers/firewire/fw-device-cdev.h
+++ b/drivers/firewire/fw-device-cdev.h
@@ -104,7 +104,7 @@ struct fw_cdev_event_iso_interrupt {
         __u32 header[0];
 };
 
-#define FW_CDEV_IOC_GET_CONFIG_ROM      _IOR('#', 0x00, struct fw_cdev_get_config_rom)
+#define FW_CDEV_IOC_GET_INFO            _IO('#', 0x00)
 #define FW_CDEV_IOC_SEND_REQUEST        _IO('#', 0x01)
 #define FW_CDEV_IOC_ALLOCATE            _IO('#', 0x02)
 #define FW_CDEV_IOC_SEND_RESPONSE       _IO('#', 0x03)
@@ -114,9 +114,32 @@ struct fw_cdev_event_iso_interrupt {
 #define FW_CDEV_IOC_START_ISO           _IO('#', 0x07)
 #define FW_CDEV_IOC_STOP_ISO            _IO('#', 0x08)
 
-struct fw_cdev_get_config_rom {
-        __u32 length;
-        __u32 data[256];
+/* FW_CDEV_VERSION History
+ *
+ * 1    Feb 18, 2007:  Initial version.
+ */
+#define FW_CDEV_VERSION         1
+
+struct fw_cdev_get_info {
+        /* The version field is just a running serial number.  We
+         * never break backwards compatibility.  Userspace passes in
+         * the version it expects and the kernel passes back the
+         * highest version it can provide.  Even if the structs in
+         * this interface are extended in a later version, the kernel
+         * will not copy back more data than what was present in the
+         * interface version userspace expects. */
+        __u32 version;
+
+        /* If non-zero, at most rom_length bytes of config rom will be
+         * copied into that user space address.  In either case,
+         * rom_length is updated with the actual length of the config
+         * rom. */
+        __u32 rom_length;
+        __u64 rom;
+
+        /* If non-zero, a fw_cdev_event_bus_reset struct will be
+         * copied here with the current state of the bus. */
+        __u64 bus_reset;
 };
 
 struct fw_cdev_send_request {