android_kernel_motorola_sm6225/drivers/firewire/fw-device-cdev.c

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/* -*- 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/idr.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 bus_reset {
struct event event;
struct fw_cdev_event_bus_reset reset;
};
struct response {
struct event event;
struct fw_transaction transaction;
struct client *client;
struct list_head link;
struct fw_cdev_event_response response;
};
struct iso_interrupt {
struct event event;
struct fw_cdev_event_iso_interrupt interrupt;
};
struct client {
u32 version;
struct fw_device *device;
spinlock_t lock;
struct list_head handler_list;
struct list_head request_list;
struct list_head transaction_list;
u32 request_serial;
struct list_head event_list;
wait_queue_head_t wait;
struct fw_iso_context *iso_context;
struct fw_iso_buffer buffer;
unsigned long vm_start;
struct list_head link;
};
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;
unsigned long flags;
device = fw_device_from_devt(inode->i_rdev);
if (device == NULL)
return -ENODEV;
client = kzalloc(sizeof *client, GFP_KERNEL);
if (client == NULL)
return -ENOMEM;
client->device = fw_device_get(device);
INIT_LIST_HEAD(&client->event_list);
INIT_LIST_HEAD(&client->handler_list);
INIT_LIST_HEAD(&client->request_list);
INIT_LIST_HEAD(&client->transaction_list);
spin_lock_init(&client->lock);
init_waitqueue_head(&client->wait);
file->private_data = client;
spin_lock_irqsave(&device->card->lock, flags);
list_add_tail(&client->link, &device->client_list);
spin_unlock_irqrestore(&device->card->lock, flags);
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);
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;
retval = wait_event_interruptible(client->wait,
!list_empty(&client->event_list) ||
fw_device_is_shutdown(client->device));
if (retval < 0)
return retval;
if (list_empty(&client->event_list) &&
fw_device_is_shutdown(client->device))
return -ENODEV;
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);
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)) {
retval = -EFAULT;
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 void
fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
struct fw_device *device)
{
struct fw_card *card = device->card;
event->type = FW_CDEV_EVENT_BUS_RESET;
event->node_id = device->node_id;
event->local_node_id = card->local_node->node_id;
event->bm_node_id = 0; /* FIXME: We don't track the BM. */
event->irm_node_id = card->irm_node->node_id;
event->root_node_id = card->root_node->node_id;
event->generation = card->generation;
}
static void
for_each_client(struct fw_device *device,
void (*callback)(struct client *client))
{
struct fw_card *card = device->card;
struct client *c;
unsigned long flags;
spin_lock_irqsave(&card->lock, flags);
list_for_each_entry(c, &device->client_list, link)
callback(c);
spin_unlock_irqrestore(&card->lock, flags);
}
static void
queue_bus_reset_event(struct client *client)
{
struct bus_reset *bus_reset;
struct fw_device *device = client->device;
bus_reset = kzalloc(sizeof *bus_reset, GFP_ATOMIC);
if (bus_reset == NULL) {
fw_notify("Out of memory when allocating bus reset event\n");
return;
}
fill_bus_reset_event(&bus_reset->reset, device);
queue_event(client, &bus_reset->event,
&bus_reset->reset, sizeof bus_reset->reset, NULL, 0);
}
void fw_device_cdev_update(struct fw_device *device)
{
for_each_client(device, queue_bus_reset_event);
}
static void wake_up_client(struct client *client)
{
wake_up_interruptible(&client->wait);
}
void fw_device_cdev_remove(struct fw_device *device)
{
for_each_client(device, wake_up_client);
}
static int ioctl_get_info(struct client *client, void __user *arg)
{
struct fw_cdev_get_info get_info;
struct fw_cdev_event_bus_reset bus_reset;
if (copy_from_user(&get_info, arg, sizeof get_info))
return -EFAULT;
client->version = get_info.version;
get_info.version = FW_CDEV_VERSION;
if (get_info.rom != 0) {
void __user *uptr = u64_to_uptr(get_info.rom);
size_t length = min(get_info.rom_length,
client->device->config_rom_length * 4);
if (copy_to_user(uptr, client->device->config_rom, length))
return -EFAULT;
}
get_info.rom_length = client->device->config_rom_length * 4;
if (get_info.bus_reset != 0) {
void __user *uptr = u64_to_uptr(get_info.bus_reset);
fill_bus_reset_event(&bus_reset, client->device);
if (copy_to_user(uptr, &bus_reset, sizeof bus_reset))
return -EFAULT;
}
get_info.card = client->device->card->index;
if (copy_to_user(arg, &get_info, sizeof get_info))
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;
unsigned long flags;
if (length < response->response.length)
response->response.length = length;
if (rcode == RCODE_COMPLETE)
memcpy(response->response.data, payload,
response->response.length);
spin_lock_irqsave(&client->lock, flags);
list_del(&response->link);
spin_unlock_irqrestore(&client->lock, flags);
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;
unsigned long flags;
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;
}
spin_lock_irqsave(&client->lock, flags);
list_add_tail(&response->link, &client->transaction_list);
spin_unlock_irqrestore(&client->lock, flags);
fw_send_request(device->card, &response->transaction,
request.tcode & 0x1f,
device->node->node_id,
request.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_deallocate(struct client *client, void __user *arg)
{
struct fw_cdev_deallocate request;
struct address_handler *handler;
unsigned long flags;
if (copy_from_user(&request, arg, sizeof request))
return -EFAULT;
spin_lock_irqsave(&client->lock, flags);
list_for_each_entry(handler, &client->handler_list, link) {
if (handler->handler.offset == request.offset) {
list_del(&handler->link);
break;
}
}
spin_unlock_irqrestore(&client->lock, flags);
if (&handler->link == &client->handler_list)
return -EINVAL;
fw_core_remove_address_handler(&handler->handler);
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 int ioctl_initiate_bus_reset(struct client *client, void __user *arg)
{
struct fw_cdev_initiate_bus_reset request;
int short_reset;
if (copy_from_user(&request, arg, sizeof request))
return -EFAULT;
short_reset = (request.type == FW_CDEV_SHORT_RESET);
return fw_core_initiate_bus_reset(client->device->card, short_reset);
}
static void
iso_callback(struct fw_iso_context *context, u32 cycle,
size_t header_length, void *header, void *data)
{
struct client *client = data;
struct iso_interrupt *interrupt;
interrupt = kzalloc(sizeof *interrupt + header_length, GFP_ATOMIC);
if (interrupt == NULL)
return;
interrupt->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT;
interrupt->interrupt.closure = 0;
interrupt->interrupt.cycle = cycle;
interrupt->interrupt.header_length = header_length;
memcpy(interrupt->interrupt.header, header, header_length);
queue_event(client, &interrupt->event,
&interrupt->interrupt,
sizeof interrupt->interrupt + header_length, 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;
if (request.channel > 63)
return -EINVAL;
switch (request.type) {
case FW_ISO_CONTEXT_RECEIVE:
if (request.header_size < 4 || (request.header_size & 3))
return -EINVAL;
break;
case FW_ISO_CONTEXT_TRANSMIT:
if (request.speed > SCODE_3200)
return -EINVAL;
break;
default:
return -EINVAL;
}
client->iso_context = fw_iso_context_create(client->device->card,
request.type,
request.channel,
request.speed,
request.header_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;
struct fw_iso_context *ctx = client->iso_context;
unsigned long payload, payload_end, header_length;
int count;
struct {
struct fw_iso_packet packet;
u8 header[256];
} u;
if (ctx == 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 0, 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.*/
payload = (unsigned long)request.data - client->vm_start;
payload_end = payload + (client->buffer.page_count << PAGE_SHIFT);
if (request.data == 0 || client->buffer.pages == NULL ||
payload >= payload_end) {
payload = 0;
payload_end = 0;
}
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;
if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
header_length = u.packet.header_length;
} else {
/* We require that header_length is a multiple of
* the fixed header size, ctx->header_size */
if (ctx->header_size == 0) {
if (u.packet.header_length > 0)
return -EINVAL;
} else if (u.packet.header_length % ctx->header_size != 0) {
return -EINVAL;
}
header_length = 0;
}
next = (struct fw_cdev_iso_packet __user *)
&p->header[header_length / 4];
if (next > end)
return -EINVAL;
if (__copy_from_user
(u.packet.header, p->header, header_length))
return -EFAULT;
if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
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(ctx, &u.packet,
&client->buffer, 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;
if (copy_to_user(arg, &request, sizeof request))
return -EFAULT;
return count;
}
static int ioctl_start_iso(struct client *client, void __user *arg)
{
struct fw_cdev_start_iso request;
if (copy_from_user(&request, arg, sizeof request))
return -EFAULT;
if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
if (request.tags == 0 || request.tags > 15)
return -EINVAL;
if (request.sync > 15)
return -EINVAL;
}
return fw_iso_context_start(client->iso_context,
request.cycle, request.sync, request.tags);
}
static int ioctl_stop_iso(struct client *client, void __user *arg)
{
return fw_iso_context_stop(client->iso_context);
}
static int
dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg)
{
switch (cmd) {
case FW_CDEV_IOC_GET_INFO:
return ioctl_get_info(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_DEALLOCATE:
return ioctl_deallocate(client, arg);
case FW_CDEV_IOC_SEND_RESPONSE:
return ioctl_send_response(client, arg);
case FW_CDEV_IOC_INITIATE_BUS_RESET:
return ioctl_initiate_bus_reset(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_START_ISO:
return ioctl_start_iso(client, arg);
case FW_CDEV_IOC_STOP_ISO:
return ioctl_stop_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;
enum dma_data_direction direction;
unsigned long size;
int page_count, retval;
/* FIXME: We could support multiple buffers, but we don't. */
if (client->buffer.pages != NULL)
return -EBUSY;
if (!(vma->vm_flags & VM_SHARED))
return -EINVAL;
if (vma->vm_start & ~PAGE_MASK)
return -EINVAL;
client->vm_start = vma->vm_start;
size = vma->vm_end - vma->vm_start;
page_count = size >> PAGE_SHIFT;
if (size & ~PAGE_MASK)
return -EINVAL;
if (vma->vm_flags & VM_WRITE)
direction = DMA_TO_DEVICE;
else
direction = DMA_FROM_DEVICE;
retval = fw_iso_buffer_init(&client->buffer, client->device->card,
page_count, direction);
if (retval < 0)
return retval;
retval = fw_iso_buffer_map(&client->buffer, vma);
if (retval < 0)
fw_iso_buffer_destroy(&client->buffer, client->device->card);
return retval;
}
static int fw_device_op_release(struct inode *inode, struct file *file)
{
struct client *client = file->private_data;
struct address_handler *h, *next_h;
struct request *r, *next_r;
struct event *e, *next_e;
struct response *t, *next_t;
unsigned long flags;
if (client->buffer.pages)
fw_iso_buffer_destroy(&client->buffer, client->device->card);
if (client->iso_context)
fw_iso_context_destroy(client->iso_context);
list_for_each_entry_safe(h, next_h, &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);
}
list_for_each_entry_safe(t, next_t, &client->transaction_list, link)
fw_cancel_transaction(client->device->card, &t->transaction);
/* FIXME: We should wait for the async tasklets to stop
* running before freeing the memory. */
list_for_each_entry_safe(e, next_e, &client->event_list, link)
kfree(e);
spin_lock_irqsave(&client->device->card->lock, flags);
list_del(&client->link);
spin_unlock_irqrestore(&client->device->card->lock, flags);
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;
unsigned int mask = 0;
poll_wait(file, &client->wait, pt);
if (fw_device_is_shutdown(client->device))
mask |= POLLHUP | POLLERR;
if (!list_empty(&client->event_list))
mask |= POLLIN | POLLRDNORM;
return mask;
}
const 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
};