if (spi->master->cleanup)
spi->master->cleanup(spi);
- class_device_put(&spi->master->cdev);
+ spi_master_put(spi->master);
kfree(dev);
}
/* NOTE: caller did any chip->bus_num checks necessary */
- if (!class_device_get(&master->cdev))
+ if (!spi_master_get(master))
return NULL;
proxy = kzalloc(sizeof *proxy, GFP_KERNEL);
return proxy;
fail:
- class_device_put(&master->cdev);
+ spi_master_put(master);
kfree(proxy);
return NULL;
}
struct spi_master *master;
master = container_of(cdev, struct spi_master, cdev);
- put_device(master->cdev.dev);
- master->cdev.dev = NULL;
kfree(master);
}
/**
* spi_alloc_master - allocate SPI master controller
* @dev: the controller, possibly using the platform_bus
- * @size: how much driver-private data to preallocate; a pointer to this
- * memory in the class_data field of the returned class_device
+ * @size: how much driver-private data to preallocate; the pointer to this
+ * memory is in the class_data field of the returned class_device,
+ * accessible with spi_master_get_devdata().
*
* This call is used only by SPI master controller drivers, which are the
* only ones directly touching chip registers. It's how they allocate
* master structure on success, else NULL.
*
* The caller is responsible for assigning the bus number and initializing
- * the master's methods before calling spi_add_master(), or else (on error)
- * calling class_device_put() to prevent a memory leak.
+ * the master's methods before calling spi_add_master(); and (after errors
+ * adding the device) calling spi_master_put() to prevent a memory leak.
*/
struct spi_master * __init_or_module
spi_alloc_master(struct device *dev, unsigned size)
{
struct spi_master *master;
+ if (!dev)
+ return NULL;
+
master = kzalloc(size + sizeof *master, SLAB_KERNEL);
if (!master)
return NULL;
class_device_initialize(&master->cdev);
master->cdev.class = &spi_master_class;
master->cdev.dev = get_device(dev);
- class_set_devdata(&master->cdev, &master[1]);
+ spi_master_set_devdata(master, &master[1]);
return master;
}
*
* This must be called from context that can sleep. It returns zero on
* success, else a negative error code (dropping the master's refcount).
+ * After a successful return, the caller is responsible for calling
+ * spi_unregister_master().
*/
int __init_or_module
spi_register_master(struct spi_master *master)
int status = -ENODEV;
int dynamic = 0;
+ if (!dev)
+ return -ENODEV;
+
/* convention: dynamically assigned bus IDs count down from the max */
if (master->bus_num == 0) {
master->bus_num = atomic_dec_return(&dyn_bus_id);
static int __unregister(struct device *dev, void *unused)
{
/* note: before about 2.6.14-rc1 this would corrupt memory: */
- device_unregister(dev);
+ spi_unregister_device(to_spi_device(dev));
return 0;
}
*/
void spi_unregister_master(struct spi_master *master)
{
- class_device_unregister(&master->cdev);
(void) device_for_each_child(master->cdev.dev, NULL, __unregister);
+ class_device_unregister(&master->cdev);
}
EXPORT_SYMBOL_GPL(spi_unregister_master);
/*-------------------------------------------------------------------------*/
+static void spi_complete(void *arg)
+{
+ complete(arg);
+}
+
/**
* spi_sync - blocking/synchronous SPI data transfers
* @spi: device with which data will be exchanged
* by leaving it selected in anticipation that the next message will go
* to the same chip. (That may increase power usage.)
*
+ * Also, the caller is guaranteeing that the memory associated with the
+ * message will not be freed before this call returns.
+ *
* The return value is a negative error code if the message could not be
* submitted, else zero. When the value is zero, then message->status is
* also defined: it's the completion code for the transfer, either zero
DECLARE_COMPLETION(done);
int status;
- message->complete = (void (*)(void *)) complete;
+ message->complete = spi_complete;
message->context = &done;
status = spi_async(spi, message);
if (status == 0)
* is zero for success, else a negative errno status code.
* This call may only be used from a context that may sleep.
*
- * Parameters to this routine are always copied using a small buffer,
- * large transfers should use use spi_{async,sync}() calls with
- * dma-safe buffers.
+ * Parameters to this routine are always copied using a small buffer;
+ * performance-sensitive or bulk transfer code should instead use
+ * spi_{async,sync}() calls with dma-safe buffers.
*/
int spi_write_then_read(struct spi_device *spi,
const u8 *txbuf, unsigned n_tx,
if ((n_tx + n_rx) > SPI_BUFSIZ)
return -EINVAL;
+ spi_message_init(&message);
+ memset(x, 0, sizeof x);
+ if (n_tx) {
+ x[0].len = n_tx;
+ spi_message_add_tail(&x[0], &message);
+ }
+ if (n_rx) {
+ x[1].len = n_rx;
+ spi_message_add_tail(&x[1], &message);
+ }
+
/* ... unless someone else is using the pre-allocated buffer */
if (down_trylock(&lock)) {
local_buf = kmalloc(SPI_BUFSIZ, GFP_KERNEL);
} else
local_buf = buf;
- memset(x, 0, sizeof x);
-
memcpy(local_buf, txbuf, n_tx);
x[0].tx_buf = local_buf;
- x[0].len = n_tx;
-
x[1].rx_buf = local_buf + n_tx;
- x[1].len = n_rx;
/* do the i/o */
- message.transfers = x;
- message.n_transfer = ARRAY_SIZE(x);
status = spi_sync(spi, &message);
if (status == 0) {
memcpy(rxbuf, x[1].rx_buf, n_rx);
projects / linux-2.6 / blobdiff