| /* |
| * Char device for device raw access |
| * |
| * Copyright (C) 2005-2007 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 <linux/firewire-cdev.h> |
| #include <asm/uaccess.h> |
| #include "fw-transaction.h" |
| #include "fw-topology.h" |
| #include "fw-device.h" |
| |
| struct client; |
| struct client_resource { |
| struct list_head link; |
| void (*release)(struct client *client, struct client_resource *r); |
| u32 handle; |
| }; |
| |
| /* |
| * 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 client_resource resource; |
| 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; |
| u32 resource_handle; |
| struct list_head resource_list; |
| struct list_head event_list; |
| wait_queue_head_t wait; |
| u64 bus_reset_closure; |
| |
| struct fw_iso_context *iso_context; |
| u64 iso_closure; |
| 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->resource_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 client *client) |
| { |
| struct fw_card *card = client->device->card; |
| |
| event->closure = client->bus_reset_closure; |
| event->type = FW_CDEV_EVENT_BUS_RESET; |
| event->node_id = client->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; |
| |
| 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, client); |
| |
| 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 *buffer) |
| { |
| struct fw_cdev_get_info *get_info = buffer; |
| struct fw_cdev_event_bus_reset bus_reset; |
| |
| 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 want = get_info->rom_length; |
| size_t have = client->device->config_rom_length * 4; |
| |
| if (copy_to_user(uptr, client->device->config_rom, |
| min(want, have))) |
| return -EFAULT; |
| } |
| get_info->rom_length = client->device->config_rom_length * 4; |
| |
| client->bus_reset_closure = get_info->bus_reset_closure; |
| if (get_info->bus_reset != 0) { |
| void __user *uptr = u64_to_uptr(get_info->bus_reset); |
| |
| fill_bus_reset_event(&bus_reset, client); |
| if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset))) |
| return -EFAULT; |
| } |
| |
| get_info->card = client->device->card->index; |
| |
| return 0; |
| } |
| |
| static void |
| add_client_resource(struct client *client, struct client_resource *resource) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&client->lock, flags); |
| list_add_tail(&resource->link, &client->resource_list); |
| resource->handle = client->resource_handle++; |
| spin_unlock_irqrestore(&client->lock, flags); |
| } |
| |
| static int |
| release_client_resource(struct client *client, u32 handle, |
| struct client_resource **resource) |
| { |
| struct client_resource *r; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&client->lock, flags); |
| list_for_each_entry(r, &client->resource_list, link) { |
| if (r->handle == handle) { |
| list_del(&r->link); |
| break; |
| } |
| } |
| spin_unlock_irqrestore(&client->lock, flags); |
| |
| if (&r->link == &client->resource_list) |
| return -EINVAL; |
| |
| if (resource) |
| *resource = r; |
| else |
| r->release(client, r); |
| |
| return 0; |
| } |
| |
| static void |
| release_transaction(struct client *client, struct client_resource *resource) |
| { |
| struct response *response = |
| container_of(resource, struct response, resource); |
| |
| fw_cancel_transaction(client->device->card, &response->transaction); |
| } |
| |
| 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->resource.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 int ioctl_send_request(struct client *client, void *buffer) |
| { |
| struct fw_device *device = client->device; |
| struct fw_cdev_send_request *request = buffer; |
| struct response *response; |
| |
| /* 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; |
| } |
| |
| response->resource.release = release_transaction; |
| add_client_resource(client, &response->resource); |
| |
| fw_send_request(device->card, &response->transaction, |
| request->tcode & 0x1f, |
| device->node->node_id, |
| request->generation, |
| device->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 client_resource resource; |
| }; |
| |
| struct request { |
| struct fw_request *request; |
| void *data; |
| size_t length; |
| struct client_resource resource; |
| }; |
| |
| struct request_event { |
| struct event event; |
| struct fw_cdev_event_request request; |
| }; |
| |
| static void |
| release_request(struct client *client, struct client_resource *resource) |
| { |
| struct request *request = |
| container_of(resource, struct request, resource); |
| |
| fw_send_response(client->device->card, request->request, |
| RCODE_CONFLICT_ERROR); |
| kfree(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; |
| 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; |
| |
| request->resource.release = release_request; |
| add_client_resource(client, &request->resource); |
| |
| e->request.type = FW_CDEV_EVENT_REQUEST; |
| e->request.tcode = tcode; |
| e->request.offset = offset; |
| e->request.length = length; |
| e->request.handle = request->resource.handle; |
| e->request.closure = handler->closure; |
| |
| queue_event(client, &e->event, |
| &e->request, sizeof(e->request), payload, length); |
| } |
| |
| static void |
| release_address_handler(struct client *client, |
| struct client_resource *resource) |
| { |
| struct address_handler *handler = |
| container_of(resource, struct address_handler, resource); |
| |
| fw_core_remove_address_handler(&handler->handler); |
| kfree(handler); |
| } |
| |
| static int ioctl_allocate(struct client *client, void *buffer) |
| { |
| struct fw_cdev_allocate *request = buffer; |
| struct address_handler *handler; |
| struct fw_address_region region; |
| |
| 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, ®ion) < 0) { |
| kfree(handler); |
| return -EBUSY; |
| } |
| |
| handler->resource.release = release_address_handler; |
| add_client_resource(client, &handler->resource); |
| request->handle = handler->resource.handle; |
| |
| return 0; |
| } |
| |
| static int ioctl_deallocate(struct client *client, void *buffer) |
| { |
| struct fw_cdev_deallocate *request = buffer; |
| |
| return release_client_resource(client, request->handle, NULL); |
| } |
| |
| static int ioctl_send_response(struct client *client, void *buffer) |
| { |
| struct fw_cdev_send_response *request = buffer; |
| struct client_resource *resource; |
| struct request *r; |
| |
| if (release_client_resource(client, request->handle, &resource) < 0) |
| return -EINVAL; |
| r = container_of(resource, struct request, resource); |
| 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 *buffer) |
| { |
| struct fw_cdev_initiate_bus_reset *request = buffer; |
| int short_reset; |
| |
| short_reset = (request->type == FW_CDEV_SHORT_RESET); |
| |
| return fw_core_initiate_bus_reset(client->device->card, short_reset); |
| } |
| |
| struct descriptor { |
| struct fw_descriptor d; |
| struct client_resource resource; |
| u32 data[0]; |
| }; |
| |
| static void release_descriptor(struct client *client, |
| struct client_resource *resource) |
| { |
| struct descriptor *descriptor = |
| container_of(resource, struct descriptor, resource); |
| |
| fw_core_remove_descriptor(&descriptor->d); |
| kfree(descriptor); |
| } |
| |
| static int ioctl_add_descriptor(struct client *client, void *buffer) |
| { |
| struct fw_cdev_add_descriptor *request = buffer; |
| struct descriptor *descriptor; |
| int retval; |
| |
| if (request->length > 256) |
| return -EINVAL; |
| |
| descriptor = |
| kmalloc(sizeof(*descriptor) + request->length * 4, GFP_KERNEL); |
| if (descriptor == NULL) |
| return -ENOMEM; |
| |
| if (copy_from_user(descriptor->data, |
| u64_to_uptr(request->data), request->length * 4)) { |
| kfree(descriptor); |
| return -EFAULT; |
| } |
| |
| descriptor->d.length = request->length; |
| descriptor->d.immediate = request->immediate; |
| descriptor->d.key = request->key; |
| descriptor->d.data = descriptor->data; |
| |
| retval = fw_core_add_descriptor(&descriptor->d); |
| if (retval < 0) { |
| kfree(descriptor); |
| return retval; |
| } |
| |
| descriptor->resource.release = release_descriptor; |
| add_client_resource(client, &descriptor->resource); |
| request->handle = descriptor->resource.handle; |
| |
| return 0; |
| } |
| |
| static int ioctl_remove_descriptor(struct client *client, void *buffer) |
| { |
| struct fw_cdev_remove_descriptor *request = buffer; |
| |
| return release_client_resource(client, request->handle, NULL); |
| } |
| |
| 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 *irq; |
| |
| irq = kzalloc(sizeof(*irq) + header_length, GFP_ATOMIC); |
| if (irq == NULL) |
| return; |
| |
| irq->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT; |
| irq->interrupt.closure = client->iso_closure; |
| irq->interrupt.cycle = cycle; |
| irq->interrupt.header_length = header_length; |
| memcpy(irq->interrupt.header, header, header_length); |
| queue_event(client, &irq->event, &irq->interrupt, |
| sizeof(irq->interrupt) + header_length, NULL, 0); |
| } |
| |
| static int ioctl_create_iso_context(struct client *client, void *buffer) |
| { |
| struct fw_cdev_create_iso_context *request = buffer; |
| struct fw_iso_context *context; |
| |
| 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; |
| } |
| |
| context = fw_iso_context_create(client->device->card, |
| request->type, |
| request->channel, |
| request->speed, |
| request->header_size, |
| iso_callback, client); |
| if (IS_ERR(context)) |
| return PTR_ERR(context); |
| |
| client->iso_closure = request->closure; |
| client->iso_context = context; |
| |
| /* We only support one context at this time. */ |
| request->handle = 0; |
| |
| return 0; |
| } |
| |
| /* Macros for decoding the iso packet control header. */ |
| #define GET_PAYLOAD_LENGTH(v) ((v) & 0xffff) |
| #define GET_INTERRUPT(v) (((v) >> 16) & 0x01) |
| #define GET_SKIP(v) (((v) >> 17) & 0x01) |
| #define GET_TAG(v) (((v) >> 18) & 0x02) |
| #define GET_SY(v) (((v) >> 20) & 0x04) |
| #define GET_HEADER_LENGTH(v) (((v) >> 24) & 0xff) |
| |
| static int ioctl_queue_iso(struct client *client, void *buffer) |
| { |
| struct fw_cdev_queue_iso *request = buffer; |
| struct fw_cdev_iso_packet __user *p, *end, *next; |
| struct fw_iso_context *ctx = client->iso_context; |
| unsigned long payload, buffer_end, header_length; |
| u32 control; |
| int count; |
| struct { |
| struct fw_iso_packet packet; |
| u8 header[256]; |
| } u; |
| |
| if (ctx == NULL || request->handle != 0) |
| return -EINVAL; |
| |
| /* |
| * 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; |
| buffer_end = client->buffer.page_count << PAGE_SHIFT; |
| if (request->data == 0 || client->buffer.pages == NULL || |
| payload >= buffer_end) { |
| payload = 0; |
| buffer_end = 0; |
| } |
| |
| p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets); |
| |
| if (!access_ok(VERIFY_READ, p, request->size)) |
| return -EFAULT; |
| |
| end = (void __user *)p + request->size; |
| count = 0; |
| while (p < end) { |
| if (get_user(control, &p->control)) |
| return -EFAULT; |
| u.packet.payload_length = GET_PAYLOAD_LENGTH(control); |
| u.packet.interrupt = GET_INTERRUPT(control); |
| u.packet.skip = GET_SKIP(control); |
| u.packet.tag = GET_TAG(control); |
| u.packet.sy = GET_SY(control); |
| u.packet.header_length = GET_HEADER_LENGTH(control); |
| |
| 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 > buffer_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; |
| |
| return count; |
| } |
| |
| static int ioctl_start_iso(struct client *client, void *buffer) |
| { |
| struct fw_cdev_start_iso *request = buffer; |
| |
| if (request->handle != 0) |
| return -EINVAL; |
| 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 *buffer) |
| { |
| struct fw_cdev_stop_iso *request = buffer; |
| |
| if (request->handle != 0) |
| return -EINVAL; |
| |
| return fw_iso_context_stop(client->iso_context); |
| } |
| |
| static int (* const ioctl_handlers[])(struct client *client, void *buffer) = { |
| ioctl_get_info, |
| ioctl_send_request, |
| ioctl_allocate, |
| ioctl_deallocate, |
| ioctl_send_response, |
| ioctl_initiate_bus_reset, |
| ioctl_add_descriptor, |
| ioctl_remove_descriptor, |
| ioctl_create_iso_context, |
| ioctl_queue_iso, |
| ioctl_start_iso, |
| ioctl_stop_iso, |
| }; |
| |
| static int |
| dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg) |
| { |
| char buffer[256]; |
| int retval; |
| |
| if (_IOC_TYPE(cmd) != '#' || |
| _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers)) |
| return -EINVAL; |
| |
| if (_IOC_DIR(cmd) & _IOC_WRITE) { |
| if (_IOC_SIZE(cmd) > sizeof(buffer) || |
| copy_from_user(buffer, arg, _IOC_SIZE(cmd))) |
| return -EFAULT; |
| } |
| |
| retval = ioctl_handlers[_IOC_NR(cmd)](client, buffer); |
| if (retval < 0) |
| return retval; |
| |
| if (_IOC_DIR(cmd) & _IOC_READ) { |
| if (_IOC_SIZE(cmd) > sizeof(buffer) || |
| copy_to_user(arg, buffer, _IOC_SIZE(cmd))) |
| return -EFAULT; |
| } |
| |
| return 0; |
| } |
| |
| 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 event *e, *next_e; |
| struct client_resource *r, *next_r; |
| 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(r, next_r, &client->resource_list, link) |
| r->release(client, r); |
| |
| /* |
| * 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 |
| }; |