return strncmp(spi->modalias, drv->name, BUS_ID_SIZE) == 0;
}
-static int spi_uevent(struct device *dev, char **envp, int num_envp,
- char *buffer, int buffer_size)
+static int spi_uevent(struct device *dev, struct kobj_uevent_env *env)
{
const struct spi_device *spi = to_spi_device(dev);
- envp[0] = buffer;
- snprintf(buffer, buffer_size, "MODALIAS=%s", spi->modalias);
- envp[1] = NULL;
+ add_uevent_var(env, "MODALIAS=%s", spi->modalias);
return 0;
}
* platforms may not be able to use spi_register_board_info though, and
* this is exported so that for example a USB or parport based adapter
* driver could add devices (which it would learn about out-of-band).
+ *
+ * Returns the new device, or NULL.
*/
struct spi_device *spi_new_device(struct spi_master *master,
struct spi_board_info *chip)
{
struct spi_device *proxy;
- struct device *dev = master->cdev.dev;
+ struct device *dev = master->dev.parent;
int status;
- /* NOTE: caller did any chip->bus_num checks necessary */
+ /* NOTE: caller did any chip->bus_num checks necessary.
+ *
+ * Also, unless we change the return value convention to use
+ * error-or-pointer (not NULL-or-pointer), troubleshootability
+ * suggests syslogged diagnostics are best here (ugh).
+ */
+
+ /* Chipselects are numbered 0..max; validate. */
+ if (chip->chip_select >= master->num_chipselect) {
+ dev_err(dev, "cs%d > max %d\n",
+ chip->chip_select,
+ master->num_chipselect);
+ return NULL;
+ }
if (!spi_master_get(master))
return NULL;
proxy->modalias = chip->modalias;
snprintf(proxy->dev.bus_id, sizeof proxy->dev.bus_id,
- "%s.%u", master->cdev.class_id,
+ "%s.%u", master->dev.bus_id,
chip->chip_select);
proxy->dev.parent = dev;
proxy->dev.bus = &spi_bus_type;
proxy->controller_state = NULL;
proxy->dev.release = spidev_release;
- /* drivers may modify this default i/o setup */
+ /* drivers may modify this initial i/o setup */
status = master->setup(proxy);
if (status < 0) {
- dev_dbg(dev, "can't %s %s, status %d\n",
+ dev_err(dev, "can't %s %s, status %d\n",
"setup", proxy->dev.bus_id, status);
goto fail;
}
*/
status = device_register(&proxy->dev);
if (status < 0) {
- dev_dbg(dev, "can't %s %s, status %d\n",
+ dev_err(dev, "can't %s %s, status %d\n",
"add", proxy->dev.bus_id, status);
goto fail;
}
* creates board info from kernel command lines
*/
-static void __init_or_module
-scan_boardinfo(struct spi_master *master)
+static void scan_boardinfo(struct spi_master *master)
{
struct boardinfo *bi;
- struct device *dev = master->cdev.dev;
mutex_lock(&board_lock);
list_for_each_entry(bi, &board_list, list) {
for (n = bi->n_board_info; n > 0; n--, chip++) {
if (chip->bus_num != master->bus_num)
continue;
- /* some controllers only have one chip, so they
- * might not use chipselects. otherwise, the
- * chipselects are numbered 0..max.
+ /* NOTE: this relies on spi_new_device to
+ * issue diagnostics when given bogus inputs
*/
- if (chip->chip_select >= master->num_chipselect
- && master->num_chipselect) {
- dev_dbg(dev, "cs%d > max %d\n",
- chip->chip_select,
- master->num_chipselect);
- continue;
- }
(void) spi_new_device(master, chip);
}
}
/*-------------------------------------------------------------------------*/
-static void spi_master_release(struct class_device *cdev)
+static void spi_master_release(struct device *dev)
{
struct spi_master *master;
- master = container_of(cdev, struct spi_master, cdev);
+ master = container_of(dev, struct spi_master, dev);
kfree(master);
}
static struct class spi_master_class = {
.name = "spi_master",
.owner = THIS_MODULE,
- .release = spi_master_release,
+ .dev_release = spi_master_release,
};
* spi_alloc_master - allocate SPI master controller
* @dev: the controller, possibly using the platform_bus
* @size: how much zeroed driver-private data to allocate; the pointer to this
- * memory is in the class_data field of the returned class_device,
+ * memory is in the driver_data field of the returned device,
* accessible with spi_master_get_devdata().
* Context: can sleep
*
if (!master)
return NULL;
- class_device_initialize(&master->cdev);
- master->cdev.class = &spi_master_class;
- master->cdev.dev = get_device(dev);
+ device_initialize(&master->dev);
+ master->dev.class = &spi_master_class;
+ master->dev.parent = get_device(dev);
spi_master_set_devdata(master, &master[1]);
return master;
int spi_register_master(struct spi_master *master)
{
static atomic_t dyn_bus_id = ATOMIC_INIT((1<<15) - 1);
- struct device *dev = master->cdev.dev;
+ struct device *dev = master->dev.parent;
int status = -ENODEV;
int dynamic = 0;
if (!dev)
return -ENODEV;
+ /* even if it's just one always-selected device, there must
+ * be at least one chipselect
+ */
+ if (master->num_chipselect == 0)
+ return -EINVAL;
+
/* convention: dynamically assigned bus IDs count down from the max */
if (master->bus_num < 0) {
+ /* FIXME switch to an IDR based scheme, something like
+ * I2C now uses, so we can't run out of "dynamic" IDs
+ */
master->bus_num = atomic_dec_return(&dyn_bus_id);
dynamic = 1;
}
/* register the device, then userspace will see it.
* registration fails if the bus ID is in use.
*/
- snprintf(master->cdev.class_id, sizeof master->cdev.class_id,
+ snprintf(master->dev.bus_id, sizeof master->dev.bus_id,
"spi%u", master->bus_num);
- status = class_device_add(&master->cdev);
+ status = device_add(&master->dev);
if (status < 0)
goto done;
- dev_dbg(dev, "registered master %s%s\n", master->cdev.class_id,
+ dev_dbg(dev, "registered master %s%s\n", master->dev.bus_id,
dynamic ? " (dynamic)" : "");
/* populate children from any spi device tables */
EXPORT_SYMBOL_GPL(spi_register_master);
-static int __unregister(struct device *dev, void *unused)
+static int __unregister(struct device *dev, void *master_dev)
{
/* note: before about 2.6.14-rc1 this would corrupt memory: */
- spi_unregister_device(to_spi_device(dev));
+ if (dev != master_dev)
+ spi_unregister_device(to_spi_device(dev));
return 0;
}
{
int dummy;
- dummy = device_for_each_child(master->cdev.dev, NULL, __unregister);
- class_device_unregister(&master->cdev);
+ dummy = device_for_each_child(master->dev.parent, &master->dev,
+ __unregister);
+ device_unregister(&master->dev);
}
EXPORT_SYMBOL_GPL(spi_unregister_master);
*/
struct spi_master *spi_busnum_to_master(u16 bus_num)
{
- struct class_device *cdev;
+ struct device *dev;
struct spi_master *master = NULL;
struct spi_master *m;
down(&spi_master_class.sem);
- list_for_each_entry(cdev, &spi_master_class.children, node) {
- m = container_of(cdev, struct spi_master, cdev);
+ list_for_each_entry(dev, &spi_master_class.children, node) {
+ m = container_of(dev, struct spi_master, dev);
if (m->bus_num == bus_num) {
master = spi_master_get(m);
break;
* 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
- * or a negative error code from the controller driver.
+ * It returns zero on success, else a negative error code.
*/
int spi_sync(struct spi_device *spi, struct spi_message *message)
{
message->complete = spi_complete;
message->context = &done;
status = spi_async(spi, message);
- if (status == 0)
+ if (status == 0) {
wait_for_completion(&done);
+ status = message->status;
+ }
message->context = NULL;
return status;
}
const u8 *txbuf, unsigned n_tx,
u8 *rxbuf, unsigned n_rx)
{
- static DECLARE_MUTEX(lock);
+ static DEFINE_MUTEX(lock);
int status;
struct spi_message message;
}
/* ... unless someone else is using the pre-allocated buffer */
- if (down_trylock(&lock)) {
+ if (!mutex_trylock(&lock)) {
local_buf = kmalloc(SPI_BUFSIZ, GFP_KERNEL);
if (!local_buf)
return -ENOMEM;
/* do the i/o */
status = spi_sync(spi, &message);
- if (status == 0) {
+ if (status == 0)
memcpy(rxbuf, x[1].rx_buf, n_rx);
- status = message.status;
- }
if (x[0].tx_buf == buf)
- up(&lock);
+ mutex_unlock(&lock);
else
kfree(local_buf);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff