static int snd_us428ctls_mmap(struct snd_hwdep * hw, struct file *filp, struct vm_area_struct *area)
{
unsigned long size = (unsigned long)(area->vm_end - area->vm_start);
struct usX2Ydev *us428 = hw->private_data;
// FIXME this hwdep interface is used twice: fpga download and mmap for controlling Lights etc. Maybe better using 2 hwdep devs?
// so as long as the device isn't fully initialised yet we return -EBUSY here.
if (!(us428->chip_status & USX2Y_STAT_CHIP_INIT))
return -EBUSY;
/* if userspace tries to mmap beyond end of our buffer, fail */
if (size > PAGE_ALIGN(sizeof(struct us428ctls_sharedmem))) {
snd_printd( "%lu > %lu\n", size, (unsigned long)sizeof(struct us428ctls_sharedmem));
return -EINVAL;
}
if (!us428->us428ctls_sharedmem) {
init_waitqueue_head(&us428->us428ctls_wait_queue_head);
if(!(us428->us428ctls_sharedmem = snd_malloc_pages(sizeof(struct us428ctls_sharedmem), GFP_KERNEL)))
return -ENOMEM;
memset(us428->us428ctls_sharedmem, -1, sizeof(struct us428ctls_sharedmem));
us428->us428ctls_sharedmem->CtlSnapShotLast = -2;
}
area->vm_ops = &us428ctls_vm_ops;
area->vm_flags |= VM_RESERVED | VM_DONTEXPAND;
area->vm_private_data = hw->private_data;
return 0;
}
static int snd_us428ctls_mmap(struct snd_hwdep * hw, struct file *filp, struct vm_area_struct *area)
{
unsigned long size = (unsigned long)(area->vm_end - area->vm_start);
struct usX2Ydev *us428 = hw->private_data;
if (!(us428->chip_status & USX2Y_STAT_CHIP_INIT))
return -EBUSY;
if (size > PAGE_ALIGN(sizeof(struct us428ctls_sharedmem))) {
snd_printd( "%lu > %lu\n", size, (unsigned long)sizeof(struct us428ctls_sharedmem));
return -EINVAL;
}
if (!us428->us428ctls_sharedmem) {
init_waitqueue_head(&us428->us428ctls_wait_queue_head);
if(!(us428->us428ctls_sharedmem = snd_malloc_pages(sizeof(struct us428ctls_sharedmem), GFP_KERNEL)))
return -ENOMEM;
memset(us428->us428ctls_sharedmem, -1, sizeof(struct us428ctls_sharedmem));
us428->us428ctls_sharedmem->CtlSnapShotLast = -2;
}
area->vm_ops = &us428ctls_vm_ops;
area->vm_flags |= VM_RESERVED | VM_DONTEXPAND;
area->vm_private_data = hw->private_data;
return 0;
}
/**
* snd_malloc_pages_fallback - allocate pages with the given size with fallback
* @size: the requested size to allocate in bytes
* @gfp_flags: the allocation conditions, GFP_XXX
* @res_size: the pointer to store the size of buffer actually allocated
*
* Allocates the physically contiguous pages with the given request
* size. When no space is left, this function reduces the size and
* tries to allocate again. The size actually allocated is stored in
* res_size argument.
*
* Returns the pointer of the buffer, or NULL if no enoguh memory.
*/
void *snd_malloc_pages_fallback(size_t size, unsigned int gfp_flags, size_t *res_size)
{
void *res;
snd_assert(size > 0, return NULL);
snd_assert(res_size != NULL, return NULL);
do {
if ((res = snd_malloc_pages(size, gfp_flags)) != NULL) {
*res_size = size;
return res;
}
size >>= 1;
} while (size >= PAGE_SIZE);
return NULL;
}
/**
* snd_dma_alloc_pages - allocate the buffer area according to the given type
* @type: the DMA buffer type
* @device: the device pointer
* @size: the buffer size to allocate
* @dmab: buffer allocation record to store the allocated data
*
* Calls the memory-allocator function for the corresponding
* buffer type.
*
* Return: Zero if the buffer with the given size is allocated successfully,
* otherwise a negative value on error.
*/
int snd_dma_alloc_pages(int type, struct device *device, size_t size,
struct snd_dma_buffer *dmab)
{
if (WARN_ON(!size))
return -ENXIO;
if (WARN_ON(!dmab))
return -ENXIO;
dmab->dev.type = type;
dmab->dev.dev = device;
dmab->bytes = 0;
switch (type) {
case SNDRV_DMA_TYPE_CONTINUOUS:
dmab->area = snd_malloc_pages(size,
(__force gfp_t)(unsigned long)device);
dmab->addr = 0;
break;
#ifdef CONFIG_HAS_DMA
#ifdef CONFIG_GENERIC_ALLOCATOR
case SNDRV_DMA_TYPE_DEV_IRAM:
snd_malloc_dev_iram(dmab, size);
if (dmab->area)
break;
/* Internal memory might have limited size and no enough space,
* so if we fail to malloc, try to fetch memory traditionally.
*/
dmab->dev.type = SNDRV_DMA_TYPE_DEV;
#endif /* CONFIG_GENERIC_ALLOCATOR */
case SNDRV_DMA_TYPE_DEV:
dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr);
break;
#endif
#ifdef CONFIG_SND_DMA_SGBUF
case SNDRV_DMA_TYPE_DEV_SG:
snd_malloc_sgbuf_pages(device, size, dmab, NULL);
break;
#endif
default:
pr_err("snd-malloc: invalid device type %d\n", type);
dmab->area = NULL;
dmab->addr = 0;
return -ENXIO;
}
if (! dmab->area)
return -ENOMEM;
dmab->bytes = size;
return 0;
}