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| author | Julian Andres Klode <jak@jak-linux.org> | 2011-09-27 19:00:48 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-09-29 17:40:40 -0700 |
| commit | 0b1076c4b2a06e517fafbb2b4704f23e69b05386 (patch) | |
| tree | d6d3b853d09e5305fa6c781cf0030306ca87571f /drivers/staging/nvec | |
| parent | b414e2eb3a487c901c6e0c515753fc0905784eac (diff) | |
| download | talos-obmc-linux-0b1076c4b2a06e517fafbb2b4704f23e69b05386.tar.gz talos-obmc-linux-0b1076c4b2a06e517fafbb2b4704f23e69b05386.zip | |
staging: nvec: Introduce new internal API for msg alloc/free
Introduce two new functions nvec_msg_alloc() and nvec_msg_free()
that allocate and free message buffers from the internal pool
of messages.
Signed-off-by: Julian Andres Klode <jak@jak-linux.org>
Acked-by: Marc Dietrich <marvin24@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging/nvec')
| -rw-r--r-- | drivers/staging/nvec/nvec.c | 23 | ||||
| -rw-r--r-- | drivers/staging/nvec/nvec.h | 6 |
2 files changed, 29 insertions, 0 deletions
diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c index 43a83a953d46..fb0f51a2b0bf 100644 --- a/drivers/staging/nvec/nvec.c +++ b/drivers/staging/nvec/nvec.c @@ -17,6 +17,7 @@ #include <asm/irq.h> +#include <linux/atomic.h> #include <linux/completion.h> #include <linux/interrupt.h> #include <linux/io.h> @@ -91,6 +92,28 @@ static int nvec_status_notifier(struct notifier_block *nb, return NOTIFY_OK; } +static struct nvec_msg *nvec_msg_alloc(struct nvec_chip *nvec) +{ + int i; + + for (i = 0; i < NVEC_POOL_SIZE; i++) { + if (atomic_xchg(&nvec->msg_pool[i].used, 1) == 0) { + dev_vdbg(nvec->dev, "INFO: Allocate %i\n", i); + return &nvec->msg_pool[i]; + } + } + + dev_err(nvec->dev, "could not allocate buffer\n"); + + return NULL; +} + +static void nvec_msg_free(struct nvec_chip *nvec, struct nvec_msg *msg) +{ + dev_vdbg(nvec->dev, "INFO: Free %ti\n", msg - nvec->msg_pool); + atomic_set(&msg->used, 0); +} + void nvec_write_async(struct nvec_chip *nvec, const unsigned char *data, short size) { diff --git a/drivers/staging/nvec/nvec.h b/drivers/staging/nvec/nvec.h index fe11225bcec1..544080259e2c 100644 --- a/drivers/staging/nvec/nvec.h +++ b/drivers/staging/nvec/nvec.h @@ -16,9 +16,13 @@ #ifndef __LINUX_MFD_NVEC #define __LINUX_MFD_NVEC +#include <linux/atomic.h> #include <linux/notifier.h> #include <linux/semaphore.h> +/* NVEC_POOL_SIZE - Size of the pool in &struct nvec_msg */ +#define NVEC_POOL_SIZE 64 + typedef enum { NVEC_2BYTES, NVEC_3BYTES, @@ -52,6 +56,7 @@ struct nvec_msg { unsigned short size; unsigned short pos; struct list_head node; + atomic_t used; }; struct nvec_subdev { @@ -78,6 +83,7 @@ struct nvec_chip { struct notifier_block nvec_status_notifier; struct work_struct rx_work, tx_work; struct nvec_msg *rx, *tx; + struct nvec_msg msg_pool[NVEC_POOL_SIZE]; /* sync write stuff */ struct semaphore sync_write_mutex; |
