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author | Anton Vorontsov <avorontsov@ru.mvista.com> | 2009-09-22 16:46:04 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-23 07:39:43 -0700 |
commit | 75368bf6c2876d8f33abfe77aa3864869a3893eb (patch) | |
tree | 97a543508a8aeb45646d059f8cdd561ae0a76ef2 /drivers/spi/spi.c | |
parent | b5f3294f0be5496aec01e5aa709a5fab8bb2f225 (diff) | |
download | linux-3.10-75368bf6c2876d8f33abfe77aa3864869a3893eb.tar.gz linux-3.10-75368bf6c2876d8f33abfe77aa3864869a3893eb.tar.bz2 linux-3.10-75368bf6c2876d8f33abfe77aa3864869a3893eb.zip |
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 'drivers/spi/spi.c')
-rw-r--r-- | drivers/spi/spi.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 70845ccd85c..8518a6eb63f 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -59,9 +59,32 @@ static struct device_attribute spi_dev_attrs[] = { * and the sysfs version makes coldplug work too. */ +static const struct spi_device_id *spi_match_id(const struct spi_device_id *id, + const struct spi_device *sdev) +{ + while (id->name[0]) { + if (!strcmp(sdev->modalias, id->name)) + return id; + id++; + } + return NULL; +} + +const struct spi_device_id *spi_get_device_id(const struct spi_device *sdev) +{ + const struct spi_driver *sdrv = to_spi_driver(sdev->dev.driver); + + return spi_match_id(sdrv->id_table, sdev); +} +EXPORT_SYMBOL_GPL(spi_get_device_id); + static int spi_match_device(struct device *dev, struct device_driver *drv) { const struct spi_device *spi = to_spi_device(dev); + const struct spi_driver *sdrv = to_spi_driver(drv); + + if (sdrv->id_table) + return !!spi_match_id(sdrv->id_table, spi); return strcmp(spi->modalias, drv->name) == 0; } |