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Subject[PATCH 2/2] Add device probing, sysfs interface and char device code.
Date
This patch add code to probe devices and integrate with the device model,
adds minimal sysfs structure and implements a char device for user space
control.
---

drivers/fw/Makefile | 3
drivers/fw/fw-device-cdev.c | 580 +++++++++++++++++++++++++++++++++++++++++
drivers/fw/fw-device-cdev.h | 141 ++++++++++
drivers/fw/fw-device.c | 611 +++++++++++++++++++++++++++++++++++++++++++
drivers/fw/fw-device.h | 156 +++++++++++
drivers/fw/fw-topology.c | 4
6 files changed, 1490 insertions(+), 5 deletions(-)

diff --git a/drivers/fw/Makefile b/drivers/fw/Makefile
index 1b2a3ad..fb6003e 100644
--- a/drivers/fw/Makefile
+++ b/drivers/fw/Makefile
@@ -2,6 +2,7 @@ #
# Makefile for the Linux IEEE 1394 implementation
#

-fw-core-objs := fw-card.o fw-topology.o fw-transaction.o fw-iso.o
+fw-core-objs := fw-card.o fw-topology.o fw-transaction.o fw-iso.o \
+ fw-device.o fw-device-cdev.o

obj-$(CONFIG_FW_CORE) += fw-core.o
diff --git a/drivers/fw/fw-device-cdev.c b/drivers/fw/fw-device-cdev.c
new file mode 100644
index 0000000..d3f14bd
--- /dev/null
+++ b/drivers/fw/fw-device-cdev.c
@@ -0,0 +1,580 @@
+/* -*- c-basic-offset: 8 -*-
+ *
+ * fw-device-cdev.c - Char device for device raw access
+ *
+ * Copyright © 2005 Kristian Høgsberg <krh@bitplanet.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/wait.h>
+#include <linux/errno.h>
+#include <linux/device.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
+#include <linux/poll.h>
+#include <linux/delay.h>
+#include <asm/uaccess.h>
+#include "fw-transaction.h"
+#include "fw-topology.h"
+#include "fw-device.h"
+#include "fw-device-cdev.h"
+
+/*
+ * todo
+ *
+ * - bus resets sends a new packet with new generation and node id
+ *
+ */
+
+/* This struct is embedded just before the actual data, so event.data
+ * becomes the data to copy to user space. Also, since
+ * dequeue_event() just kfree()'s the event, the event has to be the
+ * first field in the struct. */
+
+struct event {
+ size_t immediate_size;
+ size_t indirect_size;
+ struct list_head link;
+ void *indirect;
+ u32 immediate[0];
+};
+
+struct response {
+ struct fw_transaction transaction;
+ struct client *client;
+ struct event event;
+ struct fw_cdev_event_response response;
+};
+
+struct iso_interrupt {
+ struct event event;
+ struct fw_cdev_event_iso_interrupt interrupt;
+};
+
+struct client {
+ struct fw_device *device;
+ spinlock_t lock;
+ struct list_head handler_list;
+ struct list_head request_list;
+ u32 request_serial;
+ struct list_head event_list;
+ struct semaphore event_list_sem;
+ wait_queue_head_t wait;
+ unsigned long vm_start;
+ struct fw_iso_context *iso_context;
+};
+
+static int fw_device_op_open(struct inode *inode, struct file *file)
+{
+ struct fw_device *device;
+ struct client *client;
+
+ device = container_of(inode->i_cdev, struct fw_device, cdev);
+
+ client = kzalloc(sizeof *client, GFP_KERNEL);
+ if (client == NULL)
+ return -ENOMEM;
+
+ client->device = fw_device_get(device);
+ INIT_LIST_HEAD(&client->event_list);
+ sema_init(&client->event_list_sem, 0);
+ INIT_LIST_HEAD(&client->handler_list);
+ INIT_LIST_HEAD(&client->request_list);
+ spin_lock_init(&client->lock);
+ init_waitqueue_head(&client->wait);
+
+ file->private_data = client;
+
+ return 0;
+}
+
+static void queue_event(struct client *client, struct event *event)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&client->lock, flags);
+
+ list_add_tail(&event->link, &client->event_list);
+
+ up(&client->event_list_sem);
+ wake_up_interruptible(&client->wait);
+
+ spin_unlock_irqrestore(&client->lock, flags);
+}
+
+static int dequeue_event(struct client *client, char *buffer, size_t count)
+{
+ unsigned long flags;
+ struct event *event;
+ int retval;
+
+ if (down_interruptible(&client->event_list_sem) < 0)
+ return -EINTR;
+
+ spin_lock_irqsave(&client->lock, flags);
+
+ event = container_of(client->event_list.next, struct event, link);
+ list_del(&event->link);
+
+ spin_unlock_irqrestore(&client->lock, flags);
+
+ retval = min(event->immediate_size, count);
+ if (buffer && copy_to_user(buffer, event->immediate, retval))
+ retval = -EFAULT;
+
+ retval = min(event->indirect_size + event->immediate_size, count);
+ if (buffer && copy_to_user(buffer + event->immediate_size,
+ event->indirect,
+ retval - event->immediate_size))
+ retval = -EFAULT;
+
+ kfree(event);
+
+ return retval;
+}
+
+static ssize_t
+fw_device_op_read(struct file *file,
+ char *buffer, size_t count, loff_t *offset)
+{
+ struct client *client = file->private_data;
+
+ return dequeue_event(client, buffer, count);
+}
+
+static int ioctl_config_rom(struct client *client, unsigned long arg)
+{
+ struct fw_cdev_get_config_rom rom;
+
+ rom.length = client->device->config_rom_length;
+ memcpy(rom.data, client->device->config_rom, rom.length * 4);
+ if (copy_to_user((void *)arg, &rom,
+ (char *)&rom.data[rom.length] - (char *)&rom))
+ return -EFAULT;
+
+ return 0;
+}
+
+static void
+complete_transaction(struct fw_card *card, int rcode,
+ u32 *payload, size_t length, void *data)
+{
+ struct response *response = data;
+ struct client *client = response->client;
+
+ if (length < response->response.length)
+ response->response.length = length;
+ if (rcode == RCODE_COMPLETE)
+ memcpy(response->response.data, payload,
+ response->response.length);
+
+ response->response.type = FW_CDEV_EVENT_RESPONSE;
+ response->response.rcode = rcode;
+ response->event.immediate_size =
+ sizeof response->response + response->response.length;
+ response->event.indirect_size = 0;
+ queue_event(client, &response->event);
+}
+
+static ssize_t ioctl_send_request(struct client *client, unsigned long arg)
+{
+ struct fw_device *device = client->device;
+ struct fw_cdev_send_request request;
+ struct response *response;
+
+ if (copy_from_user(&request, (void *)arg, sizeof request))
+ return -EFAULT;
+
+ /* What is the biggest size we'll accept, really? */
+ if (request.length > 4096)
+ return -EINVAL;
+
+ response = kmalloc(sizeof *response + request.length, GFP_KERNEL);
+ if (response == NULL)
+ return -ENOMEM;
+
+ response->client = client;
+ response->response.length = request.length;
+ response->response.closure = request.closure;
+
+ if (request.data &&
+ copy_from_user(response->response.data,
+ request.data, request.length)) {
+ kfree(response);
+ return -EINVAL;
+ }
+
+ fw_send_request(device->card, &response->transaction,
+ request.tcode,
+ device->node->node_id | LOCAL_BUS,
+ device->card->generation,
+ device->node->max_speed,
+ request.offset,
+ response->response.data, request.length,
+ complete_transaction, response);
+
+ if (request.data)
+ return sizeof request + request.length;
+ else
+ return sizeof request;
+}
+
+struct address_handler {
+ struct fw_address_handler handler;
+ void *closure;
+ struct client *client;
+ struct list_head link;
+};
+
+struct request {
+ struct fw_request *request;
+ void *data;
+ size_t length;
+ u32 serial;
+ struct list_head link;
+};
+
+struct request_event {
+ struct event event;
+ struct fw_cdev_event_request request;
+};
+
+static void
+handle_request(struct fw_card *card, struct fw_request *r,
+ int tcode, int destination, int source,
+ int generation, int speed,
+ unsigned long long offset,
+ u32 *payload, size_t length, void *callback_data)
+{
+ struct address_handler *handler = callback_data;
+ struct request *request;
+ struct request_event *e;
+ unsigned long flags;
+ struct client *client = handler->client;
+
+ request = kmalloc(sizeof *request, GFP_ATOMIC);
+ e = kmalloc(sizeof *e, GFP_ATOMIC);
+ if (request == NULL || e == NULL) {
+ kfree(request);
+ kfree(e);
+ fw_send_response(card, r, RCODE_CONFLICT_ERROR);
+ return;
+ }
+
+ request->request = r;
+ request->data = payload;
+ request->length = length;
+
+ spin_lock_irqsave(&client->lock, flags);
+ request->serial = client->request_serial++;
+ list_add_tail(&request->link, &client->request_list);
+ spin_unlock_irqrestore(&client->lock, flags);
+
+ e->request.type = FW_CDEV_EVENT_REQUEST;
+ e->request.tcode = tcode;
+ e->request.offset = offset;
+ e->request.length = length;
+ e->request.serial = request->serial;
+ e->request.closure = handler->closure;
+
+ e->event.immediate_size = sizeof e->request;
+ e->event.indirect = payload;
+ e->event.indirect_size = length;
+ queue_event(client, &e->event);
+}
+
+static int ioctl_allocate(struct client *client, unsigned long arg)
+{
+ struct fw_cdev_allocate request;
+ struct address_handler *handler;
+ unsigned long flags;
+ struct fw_address_region region;
+
+ if (copy_from_user(&request, (void *)arg, sizeof request))
+ return -EFAULT;
+
+ handler = kmalloc(sizeof *handler, GFP_KERNEL);
+ if (handler == NULL)
+ return -ENOMEM;
+
+ region.start = request.offset;
+ region.end = request.offset + request.length;
+ handler->handler.length = request.length;
+ handler->handler.address_callback = handle_request;
+ handler->handler.callback_data = handler;
+ handler->closure = request.closure;
+ handler->client = client;
+
+ if (fw_core_add_address_handler(&handler->handler, &region) < 0) {
+ kfree(handler);
+ return -EBUSY;
+ }
+
+ spin_lock_irqsave(&client->lock, flags);
+ list_add_tail(&handler->link, &client->handler_list);
+ spin_unlock_irqrestore(&client->lock, flags);
+
+ return 0;
+}
+
+static int ioctl_send_response(struct client *client, unsigned long arg)
+{
+ struct fw_cdev_send_response request;
+ struct request *r;
+ unsigned long flags;
+
+ if (copy_from_user(&request, (void *)arg, sizeof request))
+ return -EFAULT;
+
+ spin_lock_irqsave(&client->lock, flags);
+ list_for_each_entry(r, &client->request_list, link) {
+ if (r->serial == request.serial) {
+ list_del(&r->link);
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&client->lock, flags);
+
+ if (&r->link == &client->request_list)
+ return -EINVAL;
+
+ if (request.length < r->length)
+ r->length = request.length;
+ if (copy_from_user(r->data, request.data, r->length))
+ return -EFAULT;
+
+ fw_send_response(client->device->card, r->request, request.rcode);
+
+ kfree(r);
+
+ return 0;
+}
+
+static void
+iso_callback(struct fw_iso_context *context, int status, u32 cycle, void *data)
+{
+ struct client *client = data;
+ struct iso_interrupt *interrupt;
+
+ interrupt = kzalloc(sizeof *interrupt, GFP_ATOMIC);
+ if (interrupt == NULL)
+ return;
+
+ interrupt->event.immediate_size = sizeof interrupt->interrupt;
+ interrupt->event.indirect_size = 0;
+ interrupt->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT;
+ interrupt->interrupt.closure = NULL;
+ interrupt->interrupt.cycle = cycle;
+ queue_event(client, &interrupt->event);
+}
+
+static int ioctl_create_iso_context(struct client *client, unsigned long arg)
+{
+ struct fw_cdev_create_iso_context *request =
+ (struct fw_cdev_create_iso_context *)arg;
+ u32 buffer_size;
+
+ if (get_user(buffer_size, &request->buffer_size))
+ return -EFAULT;
+
+ client->iso_context = fw_iso_context_create(client->device->card,
+ FW_ISO_CONTEXT_TRANSMIT,
+ buffer_size,
+ iso_callback, client);
+ if (IS_ERR(client->iso_context))
+ return PTR_ERR(client->iso_context);
+
+ return 0;
+}
+
+static int ioctl_queue_iso(struct client *client, unsigned long arg)
+{
+ struct fw_cdev_queue_iso request;
+ struct fw_cdev_iso_packet *p, *end, *next;
+ void *payload, *payload_end;
+ unsigned long index;
+ int count;
+ struct {
+ struct fw_iso_packet packet;
+ u8 header[256];
+ } u;
+
+ if (client->iso_context == NULL)
+ return -EINVAL;
+ if (copy_from_user(&request, (void *)arg, sizeof request))
+ return -EFAULT;
+
+ /* If the user passes a non-NULL data pointer, has mmap()'ed
+ * the iso buffer, and the pointer points inside the buffer,
+ * we setup the payload pointers accordingly. Otherwise we
+ * set them both to NULL, which will still let packets with
+ * payload_length == 0 through. In other words, if no packets
+ * use the indirect payload, the iso buffer need not be mapped
+ * and the request.data pointer is ignored.*/
+
+ index = (unsigned long)request.data - client->vm_start;
+ if (request.data != NULL && client->vm_start != 0 &&
+ index <= client->iso_context->buffer_size) {
+ payload = client->iso_context->buffer + index;
+ payload_end = client->iso_context->buffer +
+ client->iso_context->buffer_size;
+ } else {
+ payload = NULL;
+ payload_end = NULL;
+ }
+
+ if (!access_ok(VERIFY_READ, request.packets, request.size))
+ return -EFAULT;
+
+ p = request.packets;
+ end = (void *)p + request.size;
+ count = 0;
+ while (p < end) {
+ if (__copy_from_user(&u.packet, p, sizeof *p))
+ return -EFAULT;
+ next = (struct fw_cdev_iso_packet *)
+ &p->header[u.packet.header_length / 4];
+ if (next > end)
+ return -EINVAL;
+ if (__copy_from_user
+ (u.packet.header, p->header, u.packet.header_length))
+ return -EFAULT;
+ if (u.packet.skip &&
+ u.packet.header_length + u.packet.payload_length > 0)
+ return -EINVAL;
+ if (payload + u.packet.payload_length > payload_end)
+ return -EINVAL;
+
+ if (fw_iso_context_queue(client->iso_context,
+ &u.packet, payload))
+ break;
+
+ p = next;
+ payload += u.packet.payload_length;
+ count++;
+ }
+
+ request.size -= (void *)p - (void *)request.packets;
+ request.packets = p;
+ request.data = (void *)client->vm_start +
+ (payload - client->iso_context->buffer);
+
+ if (copy_to_user((void *)arg, &request, sizeof request))
+ return -EFAULT;
+
+ return count;
+}
+
+static int ioctl_send_iso(struct client *client, unsigned long arg)
+{
+ struct fw_cdev_send_iso *request = (struct fw_cdev_send_iso *)arg;
+
+ return fw_iso_context_send(client->iso_context, request->channel,
+ request->speed, request->cycle);
+}
+
+static int
+fw_device_op_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct client *client = file->private_data;
+
+ switch (cmd) {
+ case FW_CDEV_IOC_GET_CONFIG_ROM:
+ return ioctl_config_rom(client, arg);
+ case FW_CDEV_IOC_SEND_REQUEST:
+ return ioctl_send_request(client, arg);
+ case FW_CDEV_IOC_ALLOCATE:
+ return ioctl_allocate(client, arg);
+ case FW_CDEV_IOC_SEND_RESPONSE:
+ return ioctl_send_response(client, arg);
+ case FW_CDEV_IOC_CREATE_ISO_CONTEXT:
+ return ioctl_create_iso_context(client, arg);
+ case FW_CDEV_IOC_QUEUE_ISO:
+ return ioctl_queue_iso(client, arg);
+ case FW_CDEV_IOC_SEND_ISO:
+ return ioctl_send_iso(client, arg);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int fw_card_op_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct client *client = file->private_data;
+
+ if (client->iso_context->buffer == NULL)
+ return -EINVAL;
+
+ client->vm_start = vma->vm_start;
+
+ return remap_vmalloc_range(vma, client->iso_context->buffer, 0);
+}
+
+static int fw_device_op_release(struct inode *inode, struct file *file)
+{
+ struct client *client = file->private_data;
+ struct address_handler *h, *next;
+ struct request *r, *next_r;
+
+ if (client->iso_context)
+ fw_iso_context_destroy(client->iso_context);
+
+ list_for_each_entry_safe(h, next, &client->handler_list, link) {
+ fw_core_remove_address_handler(&h->handler);
+ kfree(h);
+ }
+
+ list_for_each_entry_safe(r, next_r, &client->request_list, link) {
+ fw_send_response(client->device->card, r->request,
+ RCODE_CONFLICT_ERROR);
+ kfree(r);
+ }
+
+ /* TODO: wait for all transactions to finish so
+ * complete_transaction doesn't try to queue up responses
+ * after we free client. */
+ while (!list_empty(&client->event_list))
+ dequeue_event(client, NULL, 0);
+
+ fw_device_put(client->device);
+ kfree(client);
+
+ return 0;
+}
+
+static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
+{
+ struct client *client = file->private_data;
+
+ poll_wait(file, &client->wait, pt);
+
+ if (!list_empty(&client->event_list))
+ return POLLIN | POLLRDNORM;
+ else
+ return 0;
+}
+
+struct file_operations fw_device_ops = {
+ .owner = THIS_MODULE,
+ .open = fw_device_op_open,
+ .read = fw_device_op_read,
+ .ioctl = fw_device_op_ioctl,
+ .poll = fw_device_op_poll,
+ .release = fw_device_op_release,
+ .mmap = fw_card_op_mmap,
+};
diff --git a/drivers/fw/fw-device-cdev.h b/drivers/fw/fw-device-cdev.h
new file mode 100644
index 0000000..af6d376
--- /dev/null
+++ b/drivers/fw/fw-device-cdev.h
@@ -0,0 +1,141 @@
+/* -*- c-basic-offset: 8 -*-
+ *
+ * fw-device-cdev.h -- Char device interface.
+ *
+ * Copyright © 2005 Kristian Høgsberg <krh@bitplanet.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __fw_cdev_h
+#define __fw_cdev_h
+
+#include <asm/ioctl.h>
+#include <asm/types.h>
+
+#define TCODE_WRITE_QUADLET_REQUEST 0
+#define TCODE_WRITE_BLOCK_REQUEST 1
+#define TCODE_WRITE_RESPONSE 2
+#define TCODE_READ_QUADLET_REQUEST 4
+#define TCODE_READ_BLOCK_REQUEST 5
+#define TCODE_READ_QUADLET_RESPONSE 6
+#define TCODE_READ_BLOCK_RESPONSE 7
+#define TCODE_CYCLE_START 8
+#define TCODE_LOCK_REQUEST 9
+#define TCODE_STREAM_DATA 10
+#define TCODE_LOCK_RESPONSE 11
+
+#define RCODE_COMPLETE 0x0
+#define RCODE_CONFLICT_ERROR 0x4
+#define RCODE_DATA_ERROR 0x5
+#define RCODE_TYPE_ERROR 0x6
+#define RCODE_ADDRESS_ERROR 0x7
+
+#define SCODE_100 0x0
+#define SCODE_200 0x1
+#define SCODE_400 0x2
+#define SCODE_800 0x3
+#define SCODE_1600 0x4
+#define SCODE_3200 0x5
+
+#define FW_CDEV_EVENT_RESPONSE 0x00
+#define FW_CDEV_EVENT_REQUEST 0x01
+#define FW_CDEV_EVENT_ISO_INTERRUPT 0x02
+
+struct fw_cdev_event_response {
+ __u32 type;
+ __u32 length;
+ __u32 rcode;
+ void *closure;
+ __u32 data[0];
+};
+
+struct fw_cdev_event_request {
+ __u32 type;
+ __u32 tcode;
+ __u64 offset;
+ __u32 length;
+ __u32 serial;
+ void *closure;
+ __u32 data[0];
+};
+
+struct fw_cdev_event_iso_interrupt {
+ __u32 type;
+ __u32 cycle;
+ void *closure;
+};
+
+#define FW_CDEV_IOC_GET_CONFIG_ROM _IOR('#', 0x00, struct fw_cdev_get_config_rom)
+#define FW_CDEV_IOC_SEND_REQUEST _IO('#', 0x01)
+#define FW_CDEV_IOC_ALLOCATE _IO('#', 0x02)
+#define FW_CDEV_IOC_SEND_RESPONSE _IO('#', 0x03)
+#define FW_CDEV_IOC_CREATE_ISO_CONTEXT _IO('#', 0x04)
+#define FW_CDEV_IOC_QUEUE_ISO _IO('#', 0x05)
+#define FW_CDEV_IOC_SEND_ISO _IO('#', 0x06)
+
+struct fw_cdev_get_config_rom {
+ __u32 length;
+ __u32 data[256];
+};
+
+struct fw_cdev_send_request {
+ __u32 tcode;
+ __u64 offset;
+ __u32 length;
+ void *closure;
+ void *data;
+};
+
+struct fw_cdev_send_response {
+ __u32 length;
+ __u32 rcode;
+ __u32 serial;
+ void *data;
+};
+
+struct fw_cdev_allocate {
+ __u64 offset;
+ __u32 length;
+ void *closure;
+};
+
+struct fw_cdev_create_iso_context {
+ __u32 buffer_size;
+};
+
+struct fw_cdev_iso_packet {
+ __u16 payload_length; /* Length of indirect payload. */
+ __u32 interrupt : 1; /* Generate interrupt on this packet */
+ __u32 skip : 1; /* Set to not send packet at all. */
+ __u32 tag : 2;
+ __u32 sy : 4;
+ __u32 header_length : 8; /* Length of immediate header. */
+ __u32 header[0];
+};
+
+struct fw_cdev_queue_iso {
+ struct fw_cdev_iso_packet *packets;
+ __u32 size;
+ void *data;
+};
+
+struct fw_cdev_send_iso {
+ __u32 channel;
+ __u32 speed;
+ __s32 cycle;
+};
+
+#endif
diff --git a/drivers/fw/fw-device.c b/drivers/fw/fw-device.c
new file mode 100644
index 0000000..b464bc7
--- /dev/null
+++ b/drivers/fw/fw-device.c
@@ -0,0 +1,611 @@
+/* -*- c-basic-offset: 8 -*-
+ *
+ * fw-device.c - Device probing and sysfs code.
+ *
+ * Copyright © 2005 Kristian Høgsberg <krh@bitplanet.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/wait.h>
+#include <linux/errno.h>
+#include <linux/kthread.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include "fw-transaction.h"
+#include "fw-topology.h"
+#include "fw-device.h"
+
+void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p)
+{
+ ci->p = p + 1;
+ ci->end = ci->p + (p[0] >> 16);
+}
+
+EXPORT_SYMBOL(fw_csr_iterator_init);
+
+int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value)
+{
+ *key = *ci->p >> 24;
+ *value = *ci->p & 0xffffff;
+
+ return ci->p++ < ci->end;
+}
+
+EXPORT_SYMBOL(fw_csr_iterator_next);
+
+static int is_fw_unit(struct device *dev);
+
+static int match_unit_directory(u32 * directory, struct fw_device_id *id)
+{
+ struct fw_csr_iterator ci;
+ int key, value, match;
+
+ match = 0;
+ fw_csr_iterator_init(&ci, directory);
+ while (fw_csr_iterator_next(&ci, &key, &value)) {
+ if (key == CSR_VENDOR && value == id->vendor)
+ match |= FW_MATCH_VENDOR;
+ if (key == CSR_MODEL && value == id->model)
+ match |= FW_MATCH_MODEL;
+ if (key == CSR_SPECIFIER_ID && value == id->specifier_id)
+ match |= FW_MATCH_SPECIFIER_ID;
+ if (key == CSR_VERSION && value == id->version)
+ match |= FW_MATCH_VERSION;
+ }
+
+ return (match & id->match_flags) == id->match_flags;
+}
+
+static int fw_unit_match(struct device *dev, struct device_driver *drv)
+{
+ struct fw_unit *unit = fw_unit(dev);
+ struct fw_driver *driver = fw_driver(drv);
+ int i;
+
+ /* We only allow binding to fw_units. */
+ if (!is_fw_unit(dev))
+ return 0;
+
+ for (i = 0; driver->id_table[i].match_flags != 0; i++) {
+ if (match_unit_directory(unit->directory, &driver->id_table[i]))
+ return 1;
+ }
+
+ return 0;
+}
+
+static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size)
+{
+ struct fw_device *device = fw_device(unit->device.parent);
+ struct fw_csr_iterator ci;
+
+ int key, value;
+ int vendor = 0;
+ int model = 0;
+ int specifier_id = 0;
+ int version = 0;
+
+ fw_csr_iterator_init(&ci, device->config_rom->data);
+ while (fw_csr_iterator_next(&ci, &key, &value)) {
+ switch (key) {
+ case CSR_VENDOR:
+ vendor = value;
+ break;
+ case CSR_MODEL:
+ model = value;
+ break;
+ }
+ }
+
+ fw_csr_iterator_init(&ci, unit->directory);
+ while (fw_csr_iterator_next(&ci, &key, &value)) {
+ switch (key) {
+ case CSR_SPECIFIER_ID:
+ specifier_id = value;
+ break;
+ case CSR_VERSION:
+ version = value;
+ break;
+ }
+ }
+
+ return snprintf(buffer, buffer_size,
+ "ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
+ vendor, model, specifier_id, version);
+}
+
+static int
+fw_unit_uevent(struct device *dev, char **envp, int num_envp,
+ char *buffer, int buffer_size)
+{
+ struct fw_unit *unit = fw_unit(dev);
+ char modalias[64];
+ int length = 0;
+ int i = 0;
+
+ if (!is_fw_unit(dev))
+ goto out;
+
+ get_modalias(unit, modalias, sizeof modalias);
+
+ if (add_uevent_var(envp, num_envp, &i,
+ buffer, buffer_size, &length,
+ "MODALIAS=%s", modalias))
+ return -ENOMEM;
+
+ out:
+ envp[i] = NULL;
+
+ return 0;
+}
+
+struct bus_type fw_bus_type = {
+ .name = "fw",
+ .match = fw_unit_match,
+ .uevent = fw_unit_uevent
+};
+
+EXPORT_SYMBOL(fw_bus_type);
+
+extern struct fw_device *fw_device_get(struct fw_device *device)
+{
+ get_device(&device->device);
+
+ return device;
+}
+
+extern void fw_device_put(struct fw_device *device)
+{
+ put_device(&device->device);
+}
+
+static void fw_device_release(struct device *dev)
+{
+ struct fw_device *device = fw_device(dev);
+ unsigned long flags;
+
+ /* Take the card lock so we don't set this to NULL while a
+ * FW_NODE_UPDATED callback is being handled. */
+ spin_lock_irqsave(&device->card->lock, flags);
+ device->node->data = NULL;
+ spin_unlock_irqrestore(&device->card->lock, flags);
+
+ fw_node_put(device->node);
+ fw_card_put(device->card);
+ kfree(device->config_rom);
+ kfree(device);
+}
+
+int fw_device_enable_phys_dma(struct fw_device *device)
+{
+ return device->card->driver->enable_phys_dma(device->card,
+ device->node_id,
+ device->generation);
+}
+
+EXPORT_SYMBOL(fw_device_enable_phys_dma);
+
+static ssize_t
+show_modalias_attribute(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct fw_unit *unit = fw_unit(dev);
+ int length;
+
+ length = get_modalias(unit, buf, PAGE_SIZE);
+ strcpy(buf + length, "\n");
+
+ return length + 1;
+}
+
+static struct device_attribute modalias_attribute = {
+ .attr = {.name = "modalias",.mode = S_IRUGO},
+ .show = show_modalias_attribute
+};
+
+static ssize_t
+show_config_rom_attribute(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct fw_device *device = fw_device(dev);
+
+ memcpy(buf, device->config_rom, device->config_rom_length * 4);
+
+ return device->config_rom_length * 4;
+}
+
+static struct device_attribute config_rom_attribute = {
+ .attr = {.name = "config_rom",.mode = S_IRUGO},
+ .show = show_config_rom_attribute,
+};
+
+struct read_quadlet_callback_data {
+ struct completion done;
+ int rcode;
+ u32 data;
+};
+
+static void
+complete_transaction(struct fw_card *card, int rcode,
+ u32 * payload, size_t length, void *data)
+{
+ struct read_quadlet_callback_data *callback_data = data;
+
+ if (rcode == RCODE_COMPLETE)
+ callback_data->data = payload[0];
+ callback_data->rcode = rcode;
+ complete(&callback_data->done);
+}
+
+static int read_rom(struct fw_device *device, int index, u32 * data)
+{
+ struct read_quadlet_callback_data callback_data;
+ struct fw_transaction t;
+ u64 offset;
+
+ init_completion(&callback_data.done);
+
+ offset = 0xfffff0000400ULL + index * 4;
+ fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST,
+ device->node_id | LOCAL_BUS,
+ device->generation, SCODE_100,
+ offset, NULL, 4, complete_transaction, &callback_data);
+
+ wait_for_completion(&callback_data.done);
+
+ *data = be32_to_cpu(callback_data.data);
+
+ return callback_data.rcode;
+}
+
+static int read_bus_info_block(struct fw_device *device)
+{
+ static u32 rom[256];
+ u32 stack[16], sp, key;
+ int i, end, length;
+
+ /* First read the bus info block. */
+ for (i = 0; i < 5; i++) {
+ if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE)
+ return -1;
+ /* As per IEEE1212 7.2, during power-up, devices can
+ * reply with a 0 for the first quadlet of the config
+ * rom to indicate that they are booting (for example,
+ * if the firmware is on the disk of a external
+ * harddisk). In that case we just fail, and the
+ * retry mechanism will try again later. */
+ if (i == 0 && rom[i] == 0)
+ return -1;
+ }
+
+ /* Now parse the config rom. The config rom is a recursive
+ * directory structure so we parse it using a stack of
+ * references to the blocks that make up the structure. We
+ * push a reference to the root directory on the stack to
+ * start things off. */
+ length = i;
+ sp = 0;
+ stack[sp++] = 0xc0000005;
+ while (sp > 0) {
+ /* Pop the next block reference of the stack. The
+ * lower 24 bits is the offset into the config rom,
+ * the upper 8 bits are the type of the reference the
+ * block. */
+ key = stack[--sp];
+ i = key & 0xffffff;
+ if (i >= ARRAY_SIZE(rom))
+ /* The reference points outside the standard
+ * config rom area, something's fishy. */
+ return -1;
+
+ /* Read header quadlet for the block to get the length. */
+ if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE)
+ return -1;
+ end = i + (rom[i] >> 16) + 1;
+ i++;
+ if (end > ARRAY_SIZE(rom))
+ /* This block extends outside standard config
+ * area (and the array we're reading it
+ * into). That's broken, so ignore this
+ * device. */
+ return -1;
+
+ /* Now read in the block. If this is a directory
+ * block, check the entries as we read them to see if
+ * it references another block, and push it in that case. */
+ while (i < end) {
+ if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE)
+ return -1;
+ if ((key >> 30) == 3 && (rom[i] >> 30) > 1 &&
+ sp < ARRAY_SIZE(stack))
+ stack[sp++] = i + rom[i];
+ i++;
+ }
+ if (length < i)
+ length = i;
+ }
+
+ device->config_rom = kmalloc(length * 4, GFP_KERNEL);
+ if (device->config_rom == NULL)
+ return -1;
+ memcpy(device->config_rom, rom, length * 4);
+ device->config_rom_length = length;
+
+ return 0;
+}
+
+static void fw_unit_release(struct device *dev)
+{
+ struct fw_unit *unit = fw_unit(dev);
+
+ kfree(unit);
+}
+
+static int is_fw_unit(struct device *dev)
+{
+ return dev->release == fw_unit_release;
+}
+
+static void create_units(struct fw_device *device)
+{
+ struct fw_csr_iterator ci;
+ struct fw_unit *unit;
+ int key, value, i;
+
+ i = 0;
+ fw_csr_iterator_init(&ci, device->config_rom->data);
+ while (fw_csr_iterator_next(&ci, &key, &value)) {
+ if (key != (CSR_UNIT | CSR_DIRECTORY))
+ continue;
+
+ /* Get the address of the unit directory and try to
+ * match the drivers id_tables against it. */
+ unit = kzalloc(sizeof *unit, GFP_KERNEL);
+ if (unit == NULL) {
+ fw_error("failed to allocate memory for unit\n");
+ continue;
+ }
+
+ unit->directory = ci.p + value - 1;
+ unit->device.bus = &fw_bus_type;
+ unit->device.release = fw_unit_release;
+ unit->device.parent = &device->device;
+ snprintf(unit->device.bus_id, sizeof unit->device.bus_id,
+ "%s.%d", device->device.bus_id, i++);
+
+ if (device_register(&unit->device) < 0) {
+ kfree(unit);
+ continue;
+ }
+
+ if (device_create_file(&unit->device, &modalias_attribute) < 0) {
+ device_unregister(&unit->device);
+ kfree(unit);
+ }
+ }
+}
+
+static int shutdown_unit(struct device *device, void *data)
+{
+ struct fw_unit *unit = fw_unit(device);
+
+ if (is_fw_unit(device)) {
+ device_remove_file(&unit->device, &modalias_attribute);
+ device_unregister(&unit->device);
+ }
+
+ return 0;
+}
+
+static void fw_device_shutdown(void *data)
+{
+ struct fw_device *device = data;
+
+ device_remove_file(&device->device, &config_rom_attribute);
+ cdev_del(&device->cdev);
+ unregister_chrdev_region(device->device.devt, 1);
+ device_for_each_child(&device->device, NULL, shutdown_unit);
+ device_unregister(&device->device);
+}
+
+/* These defines control the retry behavior for reading the config
+ * rom. It shouldn't be necessary to tweak these; if the device
+ * doesn't respond to a config rom read within 10 seconds, it's not
+ * going to respond at all. As for the initial delay, a lot of
+ * devices will be able to respond within half a second after bus
+ * reset. On the other hand, it's not really worth being more
+ * aggressive than that, since it scales pretty well; if 10 devices
+ * are plugged in, they're all getting read within one second. */
+
+#define MAX_RETRIES 5
+#define RETRY_DELAY (2 * HZ)
+#define INITIAL_DELAY (HZ / 2)
+
+static void fw_device_init(void *data)
+{
+ static int serial;
+ struct fw_device *device = data;
+
+ /* All failure paths here set node->data to NULL, so that we
+ * don't try to do device_for_each_child() on a kfree()'d
+ * device. */
+
+ if (read_bus_info_block(device) < 0) {
+ if (device->config_rom_retries < MAX_RETRIES) {
+ device->config_rom_retries++;
+ schedule_delayed_work(&device->work, RETRY_DELAY);
+ } else {
+ fw_notify("giving up on config rom for node id %d\n",
+ device->node_id);
+ fw_device_release(&device->device);
+ }
+ return;
+ }
+
+ device->device.bus = &fw_bus_type;
+ device->device.release = fw_device_release;
+ device->device.parent = device->card->device;
+ snprintf(device->device.bus_id, sizeof device->device.bus_id,
+ "fw%d", serial++);
+
+ if (alloc_chrdev_region(&device->device.devt, 0, 1, "fw")) {
+ fw_error("Failed to register char device region.\n");
+ goto error;
+ }
+
+ cdev_init(&device->cdev, &fw_device_ops);
+ device->cdev.owner = THIS_MODULE;
+ kobject_set_name(&device->cdev.kobj, device->device.bus_id);
+ if (cdev_add(&device->cdev, device->device.devt, 1)) {
+ fw_error("Failed to register char device.\n");
+ goto error;
+ }
+
+ if (device_add(&device->device)) {
+ fw_error("Failed to add device.\n");
+ goto error;
+ }
+
+ if (device_create_file(&device->device, &config_rom_attribute) < 0) {
+ fw_error("Failed to create config rom file.\n");
+ goto error_with_device;
+ }
+
+ create_units(device);
+
+ /* Transition the device to running state. If it got pulled
+ * out from under us while we did the intialization work, we
+ * have to shut down the device again here. Normally, though,
+ * fw_node_event will be responsible for shutting it down when
+ * necessary. We have to use the atomic cmpxchg here to avoid
+ * racing with the FW_NODE_DESTROYED case in
+ * fw_node_event(). */
+ if (cmpxchg(&device->state,
+ FW_DEVICE_INITIALIZING,
+ FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN)
+ fw_device_shutdown(device);
+ else
+ fw_notify("created new fw device %s (%d config rom retries)\n",
+ device->device.bus_id, device->config_rom_retries);
+
+ /* Reschedule the IRM work if we just finished reading the
+ * root node config rom. If this races with a bus reset we
+ * just end up running the IRM work a couple of extra times -
+ * pretty harmless. */
+ if (device->node == device->card->root_node)
+ schedule_work(&device->card->work);
+
+ return;
+
+ error_with_device:
+ device_del(&device->device);
+ error:
+ cdev_del(&device->cdev);
+ unregister_chrdev_region(device->device.devt, 1);
+ put_device(&device->device);
+}
+
+static int update_unit(struct device *dev, void *data)
+{
+ struct fw_unit *unit = fw_unit(dev);
+ struct fw_driver *driver = (struct fw_driver *)dev->driver;
+
+ if (is_fw_unit(dev) && driver != NULL && driver->update != NULL)
+ driver->update(unit);
+
+ return 0;
+}
+
+void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
+{
+ struct fw_device *device;
+
+ /* Ignore events for the local node (i.e. the node that
+ * corresponds to the ieee1394 controller in this linux box). */
+ if (node == card->local_node)
+ return;
+
+ switch (event) {
+ case FW_NODE_CREATED:
+ case FW_NODE_LINK_ON:
+ if (!node->link_on)
+ break;
+
+ device = kzalloc(sizeof(*device), GFP_ATOMIC);
+ if (device == NULL)
+ break;
+
+ /* Do minimal intialization of the device here, the
+ * rest will happen in fw_device_init(). We need the
+ * card and node so we can read the config rom and we
+ * need to do device_initialize() now so
+ * device_for_each_child() in FW_NODE_UPDATED is
+ * doesn't freak out. */
+ device_initialize(&device->device);
+ device->state = FW_DEVICE_INITIALIZING;
+ device->card = fw_card_get(card);
+ device->node = fw_node_get(node);
+ device->node_id = node->node_id;
+ device->generation = card->generation;
+
+ /* Set the node data to point back to this device so
+ * FW_NODE_UPDATED callbacks can update the node_id
+ * and generation for the device. */
+ node->data = device;
+
+ /* Many devices are slow to respond after bus resets,
+ * especially if they are bus powered and go through
+ * power-up after getting plugged in. We schedule the
+ * first config rom scan half a second after bus reset. */
+ INIT_WORK(&device->work, fw_device_init, device);
+ schedule_delayed_work(&device->work, INITIAL_DELAY);
+ break;
+
+ case FW_NODE_UPDATED:
+ if (!node->link_on || node->data == NULL)
+ break;
+
+ device = node->data;
+ device->node_id = node->node_id;
+ device->generation = card->generation;
+ device_for_each_child(&device->device, NULL, update_unit);
+ break;
+
+ case FW_NODE_DESTROYED:
+ case FW_NODE_LINK_OFF:
+ if (!node->data)
+ break;
+
+ /* Destroy the device associated with the node. There
+ * are two cases here: either the device is fully
+ * initialized (FW_DEVICE_RUNNING) or we're in the
+ * process of reading its config rom
+ * (FW_DEVICE_INITIALIZING). If it is fully
+ * initialized we can reuse device->work to schedule a
+ * full fw_device_shutdown(). If not, there's work
+ * scheduled to read it's config rom, and we just put
+ * the device in shutdown state to have that code fail
+ * to create the device. */
+ device = node->data;
+ if (xchg(&device->state,
+ FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) {
+ INIT_WORK(&device->work, fw_device_shutdown, device);
+ schedule_work(&device->work);
+ }
+ break;
+ }
+}
diff --git a/drivers/fw/fw-device.h b/drivers/fw/fw-device.h
new file mode 100644
index 0000000..fe0c6e5
--- /dev/null
+++ b/drivers/fw/fw-device.h
@@ -0,0 +1,156 @@
+/* -*- c-basic-offset: 8 -*-
+ *
+ * fw-device.h - Device probing and sysfs code.
+ *
+ * Copyright © 2005 Kristian Høgsberg <krh@bitplanet.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __fw_device_h
+#define __fw_device_h
+
+#include <linux/fs.h>
+#include <linux/cdev.h>
+
+enum fw_device_state {
+ FW_DEVICE_INITIALIZING,
+ FW_DEVICE_RUNNING,
+ FW_DEVICE_SHUTDOWN
+};
+
+struct fw_config_rom {
+ u32 crc : 16;
+ u32 crc_length : 8;
+ u32 info_length : 8;
+ u32 magic;
+
+
+ u32 link_speed : 3;
+ u32 reserved0 : 1;
+ u32 generation : 4;
+
+ u32 max_rom : 2;
+ u32 reserved1 : 2;
+ u32 max_receive : 4;
+
+ u32 cyc_clk_acc : 8;
+
+ u32 reserved : 3;
+ u32 pmc : 1;
+ u32 bmc : 1;
+ u32 isc : 1;
+ u32 cmc : 1;
+ u32 imc : 1;
+
+ u32 guid_high;
+ u32 guid_low;
+ u32 data[0];
+};
+
+struct fw_device {
+ int state;
+ struct fw_node *node;
+ int node_id;
+ int generation;
+ struct fw_card *card;
+ struct device device;
+ struct cdev cdev;
+ struct fw_config_rom *config_rom;
+ size_t config_rom_length;
+ int config_rom_retries;
+ struct work_struct work;
+};
+
+static inline struct fw_device *
+fw_device(struct device *dev)
+{
+ return container_of(dev, struct fw_device, device);
+}
+
+struct fw_device *fw_device_get(struct fw_device *device);
+void fw_device_put(struct fw_device *device);
+int fw_device_enable_phys_dma(struct fw_device *device);
+
+struct fw_unit {
+ struct device device;
+ u32 *directory;
+};
+
+static inline struct fw_unit *
+fw_unit(struct device *dev)
+{
+ return container_of(dev, struct fw_unit, device);
+}
+
+#define CSR_OFFSET 0x40
+#define CSR_LEAF 0x80
+#define CSR_DIRECTORY 0xc0
+
+#define CSR_DESCRIPTOR 0x01
+#define CSR_VENDOR 0x03
+#define CSR_HARDWARE_VERSION 0x04
+#define CSR_NODE_CAPABILITIES 0x0c
+#define CSR_UNIT 0x11
+#define CSR_SPECIFIER_ID 0x12
+#define CSR_VERSION 0x13
+#define CSR_DEPENDENT_INFO 0x14
+#define CSR_MODEL 0x17
+#define CSR_INSTANCE 0x18
+
+#define SBP2_COMMAND_SET_SPECIFIER 0x38
+#define SBP2_COMMAND_SET 0x39
+#define SBP2_COMMAND_SET_REVISION 0x3b
+#define SBP2_FIRMWARE_REVISION 0x3c
+
+struct fw_csr_iterator {
+ u32 *p;
+ u32 *end;
+};
+
+void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 *p);
+int fw_csr_iterator_next(struct fw_csr_iterator *ci,
+ int *key, int *value);
+
+#define FW_MATCH_VENDOR 0x0001
+#define FW_MATCH_MODEL 0x0002
+#define FW_MATCH_SPECIFIER_ID 0x0004
+#define FW_MATCH_VERSION 0x0008
+
+struct fw_device_id {
+ u32 match_flags;
+ u32 vendor;
+ u32 model;
+ u32 specifier_id;
+ u32 version;
+ void *driver_data;
+};
+
+struct fw_driver {
+ struct device_driver driver;
+ /* Called when the parent device sits through a bus reset. */
+ void (*update) (struct fw_unit *unit);
+ struct fw_device_id *id_table;
+};
+
+static inline struct fw_driver *
+fw_driver(struct device_driver *drv)
+{
+ return container_of(drv, struct fw_driver, driver);
+}
+
+extern struct file_operations fw_device_ops;
+
+#endif
diff --git a/drivers/fw/fw-topology.c b/drivers/fw/fw-topology.c
index 9fe1ab8..d691115 100644
--- a/drivers/fw/fw-topology.c
+++ b/drivers/fw/fw-topology.c
@@ -438,7 +438,3 @@ fw_core_handle_bus_reset(struct fw_card
}

EXPORT_SYMBOL(fw_core_handle_bus_reset);
-
-void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
-{
-}
-
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