diff options
Diffstat (limited to 'sound/core/isadma.c')
| -rw-r--r-- | sound/core/isadma.c | 41 |
1 files changed, 40 insertions, 1 deletions
diff --git a/sound/core/isadma.c b/sound/core/isadma.c index c3d789ef6975..28768061d769 100644 --- a/sound/core/isadma.c +++ b/sound/core/isadma.c @@ -12,8 +12,8 @@ #undef HAVE_REALLY_SLOW_DMA_CONTROLLER #include <linux/export.h> +#include <linux/isa-dma.h> #include <sound/core.h> -#include <asm/dma.h> /** * snd_dma_program - program an ISA DMA transfer @@ -97,3 +97,42 @@ unsigned int snd_dma_pointer(unsigned long dma, unsigned int size) return size - result; } EXPORT_SYMBOL(snd_dma_pointer); + +struct snd_dma_data { + int dma; +}; + +static void __snd_release_dma(struct device *dev, void *data) +{ + struct snd_dma_data *p = data; + + snd_dma_disable(p->dma); + free_dma(p->dma); +} + +/** + * snd_devm_request_dma - the managed version of request_dma() + * @dev: the device pointer + * @dma: the dma number + * @name: the name string of the requester + * + * The requested DMA will be automatically released at unbinding via devres. + * + * Return: zero on success, or a negative error code + */ +int snd_devm_request_dma(struct device *dev, int dma, const char *name) +{ + struct snd_dma_data *p; + + if (request_dma(dma, name)) + return -EBUSY; + p = devres_alloc(__snd_release_dma, sizeof(*p), GFP_KERNEL); + if (!p) { + free_dma(dma); + return -ENOMEM; + } + p->dma = dma; + devres_add(dev, p); + return 0; +} +EXPORT_SYMBOL_GPL(snd_devm_request_dma); |