* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
-#include <linux/autoconf.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/init.h>
#ifdef CONFIG_PM
-/*
- * NOTE: the suspend() method for an spi_master controller driver
- * should verify that all its child devices are marked as suspended;
- * suspend requests delivered through sysfs power/state files don't
- * enforce such constraints.
- */
static int spi_suspend(struct device *dev, pm_message_t message)
{
- int value;
+ int value = 0;
struct spi_driver *drv = to_spi_driver(dev->driver);
- if (!drv || !drv->suspend)
- return 0;
-
/* suspend will stop irqs and dma; no more i/o */
- value = drv->suspend(to_spi_device(dev), message);
- if (value == 0)
- dev->power.power_state = message;
+ if (drv) {
+ if (drv->suspend)
+ value = drv->suspend(to_spi_device(dev), message);
+ else
+ dev_dbg(dev, "... can't suspend\n");
+ }
return value;
}
static int spi_resume(struct device *dev)
{
- int value;
+ int value = 0;
struct spi_driver *drv = to_spi_driver(dev->driver);
- if (!drv || !drv->resume)
- return 0;
-
/* resume may restart the i/o queue */
- value = drv->resume(to_spi_device(dev));
- if (value == 0)
- dev->power.power_state = PMSG_ON;
+ if (drv) {
+ if (drv->resume)
+ value = drv->resume(to_spi_device(dev));
+ else
+ dev_dbg(dev, "... can't resume\n");
+ }
return value;
}
}
EXPORT_SYMBOL_GPL(spi_unregister_master);
+static int __spi_master_match(struct device *dev, void *data)
+{
+ struct spi_master *m;
+ u16 *bus_num = data;
+
+ m = container_of(dev, struct spi_master, dev);
+ return m->bus_num == *bus_num;
+}
+
/**
* spi_busnum_to_master - look up master associated with bus_num
* @bus_num: the master's bus number
{
struct device *dev;
struct spi_master *master = NULL;
- struct spi_master *m;
-
- down(&spi_master_class.sem);
- 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;
- }
- }
- up(&spi_master_class.sem);
+
+ dev = class_find_device(&spi_master_class, NULL, &bus_num,
+ __spi_master_match);
+ if (dev)
+ master = container_of(dev, struct spi_master, dev);
+ /* reference got in class_find_device */
return master;
}
EXPORT_SYMBOL_GPL(spi_busnum_to_master);
* 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;
}
/* 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)
mutex_unlock(&lock);