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authorAnton Vorontsov <avorontsov@ru.mvista.com>2009-09-22 16:46:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-23 07:39:43 -0700
commit75368bf6c2876d8f33abfe77aa3864869a3893eb (patch)
tree97a543508a8aeb45646d059f8cdd561ae0a76ef2 /include
parentb5f3294f0be5496aec01e5aa709a5fab8bb2f225 (diff)
spi: add support for device table matching
With this patch spi drivers can use standard spi_driver.id_table and MODULE_DEVICE_TABLE() mechanisms to bind against the devices. Just like we do with I2C drivers. This is useful when a single driver supports several variants of devices but it is not possible to detect them in run-time (like non-JEDEC chips probing in drivers/mtd/devices/m25p80.c), and when platform_data usage is overkill. This patch also makes life a lot easier on OpenFirmware platforms, since with OF we extensively use proper device IDs in modaliases. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Cc: David Brownell <dbrownell@users.sourceforge.net> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Jean Delvare <khali@linux-fr.org> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mod_devicetable.h10
-rw-r--r--include/linux/spi/spi.h10
2 files changed, 18 insertions, 2 deletions
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 1bf5900ffe4..b34f1ef2f1f 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -399,6 +399,16 @@ struct i2c_device_id {
__attribute__((aligned(sizeof(kernel_ulong_t))));
};
+/* spi */
+
+#define SPI_NAME_SIZE 32
+
+struct spi_device_id {
+ char name[SPI_NAME_SIZE];
+ kernel_ulong_t driver_data /* Data private to the driver */
+ __attribute__((aligned(sizeof(kernel_ulong_t))));
+};
+
/* dmi */
enum dmi_field {
DMI_NONE,
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index eb25cedb995..e2051f39f6a 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -20,6 +20,7 @@
#define __LINUX_SPI_H
#include <linux/device.h>
+#include <linux/mod_devicetable.h>
/*
* INTERFACES between SPI master-side drivers and SPI infrastructure.
@@ -86,7 +87,7 @@ struct spi_device {
int irq;
void *controller_state;
void *controller_data;
- char modalias[32];
+ char modalias[SPI_NAME_SIZE];
/*
* likely need more hooks for more protocol options affecting how
@@ -145,6 +146,7 @@ struct spi_message;
/**
* struct spi_driver - Host side "protocol" driver
+ * @id_table: List of SPI devices supported by this driver
* @probe: Binds this driver to the spi device. Drivers can verify
* that the device is actually present, and may need to configure
* characteristics (such as bits_per_word) which weren't needed for
@@ -170,6 +172,7 @@ struct spi_message;
* MMC, RTC, filesystem character device nodes, and hardware monitoring.
*/
struct spi_driver {
+ const struct spi_device_id *id_table;
int (*probe)(struct spi_device *spi);
int (*remove)(struct spi_device *spi);
void (*shutdown)(struct spi_device *spi);
@@ -734,7 +737,7 @@ struct spi_board_info {
* controller_data goes to spi_device.controller_data,
* irq is copied too
*/
- char modalias[32];
+ char modalias[SPI_NAME_SIZE];
const void *platform_data;
void *controller_data;
int irq;
@@ -802,4 +805,7 @@ spi_unregister_device(struct spi_device *spi)
device_unregister(&spi->dev);
}
+extern const struct spi_device_id *
+spi_get_device_id(const struct spi_device *sdev);
+
#endif /* __LINUX_SPI_H */