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diff --git a/share/man/man4/fwcam.4 b/share/man/man4/fwcam.4
--- a/share/man/man4/fwcam.4
+++ b/share/man/man4/fwcam.4
@@ -3,7 +3,7 @@
.\"
.\" SPDX-License-Identifier: BSD-2-Clause
.\"
-.Dd June 19, 2026
+.Dd July 12, 2026
.Dt FWCAM 4
.Os
.Sh NAME
@@ -16,7 +16,20 @@
The
.Nm
driver provides support for IIDC (Instrumentation and Industrial Digital
-Camera) v1.30 cameras attached via IEEE 1394 (FireWire).
+Camera) v1.04/v1.20/v1.30 cameras attached via IEEE 1394 (FireWire).
+.Pp
+The driver attaches to unit directories in the device CSR configuration ROM
+with
+.Va unit_spec_id
+0x00a02d (1394 Trade Association) and
+.Va unit_sw_version
+matching IIDC v1.04, v1.20, or v1.30.
+The IIDC command base address is located within the unit directory
+or a nested logical unit directory.
+.Pp
+Camera hardware probing is deferred until the device is first opened.
+This avoids bus resets on controllers where early register access
+destabilizes the link.
.Pp
Video frames are received over an isochronous DMA channel and exposed
through a character device.
diff --git a/sys/dev/firewire/fwcam.h b/sys/dev/firewire/fwcam.h
--- a/sys/dev/firewire/fwcam.h
+++ b/sys/dev/firewire/fwcam.h
@@ -203,9 +203,10 @@
/* fwcam state values (visible to userland via fwcam_info.state) */
#define FWCAM_STATE_IDLE 0
-#define FWCAM_STATE_PROBED 1
-#define FWCAM_STATE_STREAMING 2
-#define FWCAM_STATE_DETACHING 3
+#define FWCAM_STATE_PROBING 1
+#define FWCAM_STATE_PROBED 2
+#define FWCAM_STATE_STREAMING 3
+#define FWCAM_STATE_DETACHING 4
/* IIDC format/mode/rate/feature/state name tables for userland and driver */
#define FWCAM_FMT_NMAX 8
@@ -248,6 +249,7 @@
static const char * const fwcam_state_names[] = {
[FWCAM_STATE_IDLE] = "idle",
+ [FWCAM_STATE_PROBING] = "probing",
[FWCAM_STATE_PROBED] = "probed",
[FWCAM_STATE_STREAMING] = "streaming",
[FWCAM_STATE_DETACHING] = "detaching",
diff --git a/sys/dev/firewire/fwcam.c b/sys/dev/firewire/fwcam.c
--- a/sys/dev/firewire/fwcam.c
+++ b/sys/dev/firewire/fwcam.c
@@ -52,13 +52,10 @@
printf("fwcam: " fmt, ## __VA_ARGS__); \
} while (0)
-static void fwcam_identify(driver_t *, device_t);
static int fwcam_probe(device_t);
static int fwcam_attach(device_t);
static int fwcam_detach(device_t);
-static void fwcam_post_busreset(void *);
static void fwcam_probe_task(void *, int);
-static void fwcam_post_explore(void *);
static int fwcam_iso_start(struct fwcam_softc *);
static void fwcam_iso_stop(struct fwcam_softc *);
static void fwcam_iso_input(struct fw_xferq *);
@@ -80,25 +77,56 @@
.d_name = "fwcam",
};
+/*
+ * Search a CSR directory for the IIDC command base register (key 0x40).
+ * The iSight places cmd_base inside a logical_unit_directory nested
+ * within the IIDC unit directory, so we recurse into sub-directories
+ * up to max_depth levels.
+ */
static uint32_t
-fwcam_find_iidc(struct fw_device *fwdev)
+fwcam_search_dir_cmd_base(uint32_t *csrrom, uint32_t dir_qoff,
+ uint32_t rom_quads, int max_depth)
{
- struct crom_context cc;
+ struct csrdirectory *dir;
struct csrreg *reg;
- uint32_t cmd_base;
+ uint32_t dir_len, sub_qoff, val;
+ int i;
- if (!crom_has_specver(fwdev->csrrom, CSRVAL_1394TA, CSR_PROTCAM130) &&
- !crom_has_specver(fwdev->csrrom, CSRVAL_1394TA, CSR_PROTCAM120) &&
- !crom_has_specver(fwdev->csrrom, CSRVAL_1394TA, CSR_PROTCAM104))
+ if (dir_qoff >= rom_quads || max_depth <= 0)
+ return (0);
+ dir = (struct csrdirectory *)&csrrom[dir_qoff];
+ dir_len = dir->crc_len;
+ if (dir_qoff + 1 + dir_len > rom_quads)
return (0);
- cmd_base = 0;
- crom_init_context(&cc, fwdev->csrrom);
- reg = crom_search_key(&cc, IIDC_CROM_CMD_BASE);
- if (reg != NULL && reg->val != 0)
- cmd_base = reg->val;
+ for (i = 0; i < (int)dir_len; i++) {
+ if (dir_qoff + 1 + i >= rom_quads)
+ break;
+ reg = &dir->entry[i];
+ if (reg->key == IIDC_CROM_CMD_BASE && reg->val != 0)
+ return (reg->val);
+ if ((reg->key & CSRTYPE_MASK) == CSRTYPE_D) {
+ sub_qoff = dir_qoff + 1 + i + reg->val;
+ val = fwcam_search_dir_cmd_base(csrrom, sub_qoff,
+ rom_quads, max_depth - 1);
+ if (val != 0)
+ return (val);
+ }
+ }
+ return (0);
+}
+
+/*
+ * Extract IIDC command base register from the unit directory.
+ * Searches the unit directory and any sub-directories (the iSight
+ * places cmd_base inside a logical_unit_directory).
+ */
+static uint32_t
+fwcam_find_iidc_cmd_base(struct fw_unit *unit)
+{
- return (cmd_base);
+ return (fwcam_search_dir_cmd_base(unit->fwdev->csrrom,
+ unit->dir_offset / 4, CSRROMSIZE / 4, 2));
}
static int
@@ -286,11 +314,18 @@
return;
}
sc->state = FWCAM_STATE_PROBED;
+ wakeup(sc);
FWCAM_UNLOCK(sc);
if (sc->dma_ch >= 0 &&
sc->state != FWCAM_STATE_DETACHING)
fwcam_iso_start(sc);
+ } else {
+ FWCAM_LOCK(sc);
+ if (sc->state == FWCAM_STATE_PROBING)
+ sc->state = FWCAM_STATE_IDLE;
+ wakeup(sc);
+ FWCAM_UNLOCK(sc);
}
}
@@ -616,16 +651,33 @@
fwcam_cdev_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
struct fwcam_softc *sc = dev->si_drv1;
+ int err;
FWCAM_LOCK(sc);
if (sc->state == FWCAM_STATE_DETACHING) {
FWCAM_UNLOCK(sc);
return (ENXIO);
}
+
+ if (sc->state == FWCAM_STATE_IDLE) {
+ sc->state = FWCAM_STATE_PROBING;
+ FWCAM_UNLOCK(sc);
+ taskqueue_enqueue(taskqueue_thread, &sc->probe_task);
+ FWCAM_LOCK(sc);
+ }
+
+ while (sc->state == FWCAM_STATE_PROBING) {
+ err = msleep(sc, &sc->mtx, PCATCH, "fwcampr", 10 * hz);
+ if (err) {
+ FWCAM_UNLOCK(sc);
+ return (err == EWOULDBLOCK ? ETIMEDOUT : err);
+ }
+ }
+
if (sc->state != FWCAM_STATE_PROBED &&
sc->state != FWCAM_STATE_STREAMING) {
FWCAM_UNLOCK(sc);
- return (EAGAIN); /* not yet probed */
+ return (ENXIO);
}
sc->open_count++;
@@ -937,103 +989,53 @@
}
}
-static void
-fwcam_post_explore(void *arg)
-{
- struct fwcam_softc *sc = (struct fwcam_softc *)arg;
- struct fw_device *fwdev;
- uint32_t cmd_base;
- int was_streaming, err;
-
- FWCAM_LOCK(sc);
-
- if (sc->state == FWCAM_STATE_DETACHING) {
- FWCAM_UNLOCK(sc);
- return;
- }
-
- if (sc->fwdev != NULL) {
- STAILQ_FOREACH(fwdev, &sc->fd.fc->devices, link) {
- if (fwdev == sc->fwdev &&
- fwdev->status == FWDEVATTACHED)
- break;
- }
- if (fwdev == NULL) {
- was_streaming = (sc->state == FWCAM_STATE_STREAMING);
- device_printf(sc->fd.dev, "camera disconnected%s\n",
- was_streaming ? " (was streaming)" : "");
- sc->fwdev = NULL;
- sc->state = FWCAM_STATE_IDLE;
- wakeup(sc); /* unblock readers */
- selwakeup(&sc->rsel);
- FWCAM_UNLOCK(sc);
-
- if (was_streaming)
- fwcam_iso_stop(sc);
- FWCAM_LOCK(sc);
- }
- }
-
- if (sc->fwdev == NULL) {
- STAILQ_FOREACH(fwdev, &sc->fd.fc->devices, link) {
- if (fwdev->status != FWDEVATTACHED)
- continue;
-
- cmd_base = fwcam_find_iidc(fwdev);
- if (cmd_base == 0)
- continue;
-
- sc->fwdev = fwdev;
- sc->cmd_hi = 0xffff;
- sc->cmd_lo = 0xf0000000 | (cmd_base << 2);
- sc->iso_speed = min(fwdev->speed, FWSPD_S400);
-
- FWCAM_UNLOCK(sc);
- err = taskqueue_enqueue(taskqueue_thread,
- &sc->probe_task);
- if (err)
- device_printf(sc->fd.dev,
- "taskqueue_enqueue failed: %d\n", err);
- return;
- }
- }
-
- FWCAM_UNLOCK(sc);
-}
-
-static void
-fwcam_post_busreset(void *arg __unused)
-{
-
-}
-
-static void
-fwcam_identify(driver_t *driver, device_t parent)
-{
-
- if (device_find_child(parent, "fwcam", DEVICE_UNIT_ANY) == NULL)
- BUS_ADD_CHILD(parent, 0, "fwcam", DEVICE_UNIT_ANY);
-}
static int
fwcam_probe(device_t dev)
{
+ struct fw_unit *unit;
+
+ unit = fw_get_unit(dev);
+ if (unit == NULL)
+ return (ENXIO);
+
+ if (unit->spec_id != CSRVAL_1394TA)
+ return (ENXIO);
+ if (unit->sw_version != CSR_PROTCAM130 &&
+ unit->sw_version != CSR_PROTCAM120 &&
+ unit->sw_version != CSR_PROTCAM104)
+ return (ENXIO);
device_set_desc(dev, "IIDC Digital Camera over FireWire");
- return (0);
+ return (BUS_PROBE_DEFAULT);
}
static int
fwcam_attach(device_t dev)
{
struct fwcam_softc *sc;
+ struct fw_unit *unit;
+ uint32_t cmd_base;
+
+ unit = fw_get_unit(dev);
+ if (unit == NULL || unit->fwdev == NULL)
+ return (ENXIO);
+
+ cmd_base = fwcam_find_iidc_cmd_base(unit);
+ if (cmd_base == 0) {
+ device_printf(dev, "no IIDC command base in unit directory\n");
+ return (ENXIO);
+ }
sc = device_get_softc(dev);
sc->fd.dev = dev;
- sc->fd.fc = device_get_ivars(dev);
+ sc->fd.fc = fw_get_comm(dev);
mtx_init(&sc->mtx, "fwcam", NULL, MTX_DEF);
- sc->fwdev = NULL;
+ sc->fwdev = unit->fwdev;
+ sc->cmd_hi = 0xffff;
+ sc->cmd_lo = 0xf0000000 | (cmd_base << 2);
+ sc->iso_speed = min(unit->fwdev->speed, FWSPD_S400);
sc->state = FWCAM_STATE_IDLE;
sc->dma_ch = -1;
sc->iso_active = 0;
@@ -1045,11 +1047,6 @@
UID_ROOT, GID_OPERATOR, 0660, "fwcam%d", device_get_unit(dev));
sc->cdev->si_drv1 = sc;
- sc->fd.post_busreset = fwcam_post_busreset;
- sc->fd.post_explore = fwcam_post_explore;
-
- fwcam_post_explore(sc);
-
return (0);
}
@@ -1084,7 +1081,6 @@
}
static device_method_t fwcam_methods[] = {
- DEVMETHOD(device_identify, fwcam_identify),
DEVMETHOD(device_probe, fwcam_probe),
DEVMETHOD(device_attach, fwcam_attach),
DEVMETHOD(device_detach, fwcam_detach),

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