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firewire: Add device probing and sysfs integration.

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Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Kristian Høgsberg 2006-12-19 19:58:31 -05:00 committed by Stefan Richter
parent 3038e353cf
commit 19a15b937b
10 changed files with 1573 additions and 9 deletions
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3
drivers/firewire/Makefile
View file

@ -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) += fw-core.o

56
drivers/firewire/fw-card.c
View file

@ -24,6 +24,7 @@
#include <linux/device.h>
#include "fw-transaction.h"
#include "fw-topology.h"
#include "fw-device.h"
/* The lib/crc16.c implementation uses the standard (0x8005)
* polynomial, but we need the ITU-T (or CCITT) polynomial (0x1021).
@ -185,6 +186,59 @@ fw_core_remove_descriptor (struct fw_descriptor *desc)
}
EXPORT_SYMBOL(fw_core_remove_descriptor);
static void
fw_card_irm_work(struct work_struct *work)
{
struct fw_card *card =
container_of(work, struct fw_card, work.work);
struct fw_device *root;
unsigned long flags;
int new_irm_id, generation;
/* FIXME: This simple bus management unconditionally picks a
* cycle master if the current root can't do it. We need to
* not do this if there is a bus manager already. Also, some
* hubs set the contender bit, which is bogus, so we should
* probably do a little sanity check on the IRM (like, read
* the bandwidth register) if it's not us. */
spin_lock_irqsave(&card->lock, flags);
generation = card->generation;
root = card->root_node->data;
if (root == NULL)
/* Either link_on is false, or we failed to read the
* config rom. In either case, pick another root. */
new_irm_id = card->local_node->node_id;
else if (root->state != FW_DEVICE_RUNNING)
/* If we haven't probed this device yet, bail out now
* and let's try again once that's done. */
new_irm_id = -1;
else if (root->config_rom[2] & bib_cmc)
/* FIXME: I suppose we should set the cmstr bit in the
* STATE_CLEAR register of this node, as described in
* 1394-1995, 8.4.2.6. Also, send out a force root
* packet for this node. */
new_irm_id = -1;
else
/* Current root has an active link layer and we
* successfully read the config rom, but it's not
* cycle master capable. */
new_irm_id = card->local_node->node_id;
if (card->irm_retries++ > 5)
new_irm_id = -1;
spin_unlock_irqrestore(&card->lock, flags);
if (new_irm_id > 0) {
fw_notify("Trying to become root (card %d)\n", card->index);
fw_send_force_root(card, new_irm_id, generation);
fw_core_initiate_bus_reset(card, 1);
}
}
static void
release_card(struct device *device)
{
@ -222,6 +276,8 @@ fw_card_initialize(struct fw_card *card, struct fw_card_driver *driver,
card->local_node = NULL;
INIT_DELAYED_WORK(&card->work, fw_card_irm_work);
card->card_device.bus = &fw_bus_type;
card->card_device.release = release_card;
card->card_device.parent = card->device;

617
drivers/firewire/fw-device-cdev.c Normal file
View file

@ -0,0 +1,617 @@
/* -*- c-basic-offset: 8 -*-
*
* fw-device-cdev.c - Char device for device raw access
*
* Copyright (C) 2005-2006 Kristian Hoegsberg <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/kernel.h>
#include <linux/wait.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/vmalloc.h>
#include <linux/poll.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/compat.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
*
*/
/* dequeue_event() just kfree()'s the event, so the event has to be
* the first field in the struct. */
struct event {
struct { void *data; size_t size; } v[2];
struct list_head link;
};
struct response {
struct event event;
struct fw_transaction transaction;
struct client *client;
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 inline void __user *
u64_to_uptr(__u64 value)
{
return (void __user *)(unsigned long)value;
}
static inline __u64
uptr_to_u64(void __user *ptr)
{
return (__u64)(unsigned long)ptr;
}
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,
void *data0, size_t size0, void *data1, size_t size1)
{
unsigned long flags;
event->v[0].data = data0;
event->v[0].size = size0;
event->v[1].data = data1;
event->v[1].size = size1;
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 __user *buffer, size_t count)
{
unsigned long flags;
struct event *event;
size_t size, total;
int i, retval = -EFAULT;
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);
if (buffer == NULL)
goto out;
total = 0;
for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
size = min(event->v[i].size, count - total);
if (copy_to_user(buffer + total, event->v[i].data, size))
goto out;
total += size;
}
retval = total;
out:
kfree(event);
return retval;
}
static ssize_t
fw_device_op_read(struct file *file,
char __user *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, void __user *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(arg, &rom,
(char *)&rom.data[rom.length] - (char *)&rom))
return -EFAULT;
return 0;
}
static void
complete_transaction(struct fw_card *card, int rcode,
void *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;
queue_event(client, &response->event,
&response->response, sizeof response->response,
response->response.data, response->response.length);
}
static ssize_t ioctl_send_request(struct client *client, void __user *arg)
{
struct fw_device *device = client->device;
struct fw_cdev_send_request request;
struct response *response;
if (copy_from_user(&request, 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,
u64_to_uptr(request.data), request.length)) {
kfree(response);
return -EFAULT;
}
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;
__u64 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,
void *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;
queue_event(client, &e->event,
&e->request, sizeof e->request, payload, length);
}
static int ioctl_allocate(struct client *client, void __user *arg)
{
struct fw_cdev_allocate request;
struct address_handler *handler;
unsigned long flags;
struct fw_address_region region;
if (copy_from_user(&request, 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, void __user *arg)
{
struct fw_cdev_send_response request;
struct request *r;
unsigned long flags;
if (copy_from_user(&request, 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, u64_to_uptr(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->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT;
interrupt->interrupt.closure = 0;
interrupt->interrupt.cycle = cycle;
queue_event(client, &interrupt->event,
&interrupt->interrupt, sizeof interrupt->interrupt, NULL, 0);
}
static int ioctl_create_iso_context(struct client *client, void __user *arg)
{
struct fw_cdev_create_iso_context request;
if (copy_from_user(&request, arg, sizeof request))
return -EFAULT;
client->iso_context = fw_iso_context_create(client->device->card,
FW_ISO_CONTEXT_TRANSMIT,
request.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, void __user *arg)
{
struct fw_cdev_queue_iso request;
struct fw_cdev_iso_packet __user *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, 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 != 0 && 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 = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request.packets);
end = (void __user *)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 __user *)
&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 -= uptr_to_u64(p) - request.packets;
request.packets = uptr_to_u64(p);
request.data =
client->vm_start + (payload - client->iso_context->buffer);
if (copy_to_user(arg, &request, sizeof request))
return -EFAULT;
return count;
}
static int ioctl_send_iso(struct client *client, void __user *arg)
{
struct fw_cdev_send_iso request;
if (copy_from_user(&request, arg, sizeof request))
return -EFAULT;
return fw_iso_context_send(client->iso_context, request.channel,
request.speed, request.cycle);
}
static int
dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg)
{
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 long
fw_device_op_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
struct client *client = file->private_data;
return dispatch_ioctl(client, cmd, (void __user *) arg);
}
#ifdef CONFIG_COMPAT
static long
fw_device_op_compat_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
struct client *client = file->private_data;
return dispatch_ioctl(client, cmd, compat_ptr(arg));
}
#endif
static int fw_device_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,
.unlocked_ioctl = fw_device_op_ioctl,
.poll = fw_device_op_poll,
.release = fw_device_op_release,
.mmap = fw_device_op_mmap,
#ifdef CONFIG_COMPAT
.compat_ioctl = fw_device_op_compat_ioctl
#endif
};

146
drivers/firewire/fw-device-cdev.h Normal file
View file

@ -0,0 +1,146 @@
/* -*- c-basic-offset: 8 -*-
*
* fw-device-cdev.h -- Char device interface.
*
* Copyright (C) 2005-2006 Kristian Hoegsberg <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
/* The 'closure' fields are for user space to use. Data passed in the
* 'closure' field for a request will be returned in the corresponding
* event. It's a 64-bit type so that it's a fixed size type big
* enough to hold a pointer on all platforms. */
struct fw_cdev_event_response {
__u32 type;
__u32 rcode;
__u64 closure;
__u32 length;
__u32 data[0];
};
struct fw_cdev_event_request {
__u32 type;
__u32 tcode;
__u64 offset;
__u64 closure;
__u32 serial;
__u32 length;
__u32 data[0];
};
struct fw_cdev_event_iso_interrupt {
__u32 type;
__u32 cycle;
__u64 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;
__u32 length;
__u64 offset;
__u64 closure;
__u64 data;
};
struct fw_cdev_send_response {
__u32 rcode;
__u32 length;
__u64 data;
__u32 serial;
};
struct fw_cdev_allocate {
__u64 offset;
__u64 closure;
__u32 length;
};
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 {
__u32 size;
__u64 packets;
__u64 data;
};
struct fw_cdev_send_iso {
__u32 channel;
__u32 speed;
__s32 cycle;
};
#endif

613
drivers/firewire/fw-device.c Normal file
View file

@ -0,0 +1,613 @@
/* -*- c-basic-offset: 8 -*-
*
* fw-device.c - Device probing and sysfs code.
*
* Copyright (C) 2005-2006 Kristian Hoegsberg <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[5]);
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,
void *payload, size_t length, void *data)
{
struct read_quadlet_callback_data *callback_data = data;
if (rcode == RCODE_COMPLETE)
callback_data->data = be32_to_cpu(*(__be32 *)payload);
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 = 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[5]);
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(struct work_struct *work)
{
struct fw_device *device =
container_of(work, struct fw_device, work.work);
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(struct work_struct *work)
{
static int serial;
struct fw_device *device =
container_of(work, struct fw_device, work.work);
/* 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->work.work);
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_delayed_work(&device->card->work, 0);
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_DELAYED_WORK(&device->work, fw_device_init);
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_DELAYED_WORK(&device->work, fw_device_shutdown);
schedule_delayed_work(&device->work, 0);
}
break;
}
}

127
drivers/firewire/fw-device.h Normal file
View file

@ -0,0 +1,127 @@
/* -*- c-basic-offset: 8 -*-
*
* fw-device.h - Device probing and sysfs code.
*
* Copyright (C) 2005-2006 Kristian Hoegsberg <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_device {
int state;
struct fw_node *node;
int node_id;
int generation;
struct fw_card *card;
struct device device;
struct cdev cdev;
__be32 *config_rom;
size_t config_rom_length;
int config_rom_retries;
struct delayed_work 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

1
drivers/firewire/fw-iso.c
View file

@ -26,6 +26,7 @@
#include "fw-transaction.h"
#include "fw-topology.h"
#include "fw-device.h"
static int
setup_iso_buffer(struct fw_iso_context *ctx, size_t size,

10
drivers/firewire/fw-topology.c
View file

@ -434,13 +434,15 @@ fw_core_handle_bus_reset(struct fw_card *card,
for_each_fw_node(card, local_node, report_found_node);
} else {
update_tree(card, local_node, &changed);
if (changed)
card->irm_retries = 0;
}
/* If we're not the root node, we may have to do some IRM work. */
if (card->local_node != card->root_node)
schedule_delayed_work(&card->work, 0);
spin_unlock_irqrestore(&card->lock, flags);
}
EXPORT_SYMBOL(fw_core_handle_bus_reset);
void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
{
}

5
drivers/firewire/fw-transaction.c
View file

@ -33,6 +33,7 @@
#include "fw-transaction.h"
#include "fw-topology.h"
#include "fw-device.h"
#define header_pri(pri) ((pri) << 0)
#define header_tcode(tcode) ((tcode) << 4)
@ -702,10 +703,6 @@ static struct fw_descriptor vendor_textual_descriptor = {
.data = vendor_textual_descriptor_data
};
struct bus_type fw_bus_type = {
.name = "fw",
};
static int __init fw_core_init(void)
{
int retval;

4
drivers/firewire/fw-transaction.h
View file

@ -265,6 +265,10 @@ struct fw_card {
struct device card_device;
struct list_head link;
/* Work struct for IRM duties. */
struct delayed_work work;
int irm_retries;
};
struct fw_card *fw_card_get(struct fw_card *card);