8ae12a0d85
This is the core of a small SPI framework, implementing the model of a
queue of messages which complete asynchronously (with thin synchronous
wrappers on top).
- It's still less than 2KB of ".text" (ARM). If there's got to be a
mid-layer for something so simple, that's the right size budget. :)
- The guts use board-specific SPI device tables to build the driver
model tree. (Hardware probing is rarely an option.)
- This version of Kconfig includes no drivers. At this writing there
are two known master controller drivers (PXA/SSP, OMAP MicroWire)
and three protocol drivers (CS8415a, ADS7846, DataFlash) with LKML
mentions of other drivers in development.
- No userspace API. There are several implementations to compare.
Implement them like any other driver, and bind them with sysfs.
The changes from last version posted to LKML (on 11-Nov-2005) are minor,
and include:
- One bugfix (removes a FIXME), with the visible effect of making device
names be "spiB.C" where B is the bus number and C is the chipselect.
- The "caller provides DMA mappings" mechanism now has kerneldoc, for
DMA drivers that want to be fancy.
- Hey, the framework init can be subsys_init. Even though board init
logic fires earlier, at arch_init ... since the framework init is
for driver support, and the board init support uses static init.
- Various additional spec/doc clarifications based on discussions
with other folk. It adds a brief "thank you" at the end, for folk
who've helped nudge this framework into existence.
As I've said before, I think that "protocol tweaking" is the main support
that this driver framework will need to evolve.
From: Mark Underwood <basicmark@yahoo.com>
Update the SPI framework to remove a potential priority inversion case by
reverting to kmalloc if the pre-allocated DMA-safe buffer isn't available.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
72 lines
1.1 KiB
Text
72 lines
1.1 KiB
Text
# drivers/Kconfig
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menu "Device Drivers"
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source "drivers/base/Kconfig"
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source "drivers/connector/Kconfig"
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source "drivers/mtd/Kconfig"
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source "drivers/parport/Kconfig"
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source "drivers/pnp/Kconfig"
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source "drivers/block/Kconfig"
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source "drivers/ide/Kconfig"
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source "drivers/scsi/Kconfig"
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source "drivers/cdrom/Kconfig"
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source "drivers/md/Kconfig"
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source "drivers/message/fusion/Kconfig"
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source "drivers/ieee1394/Kconfig"
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source "drivers/message/i2o/Kconfig"
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source "drivers/macintosh/Kconfig"
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source "drivers/net/Kconfig"
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source "drivers/isdn/Kconfig"
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source "drivers/telephony/Kconfig"
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# input before char - char/joystick depends on it. As does USB.
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source "drivers/input/Kconfig"
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source "drivers/char/Kconfig"
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source "drivers/i2c/Kconfig"
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source "drivers/spi/Kconfig"
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source "drivers/w1/Kconfig"
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source "drivers/hwmon/Kconfig"
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source "drivers/misc/Kconfig"
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source "drivers/mfd/Kconfig"
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source "drivers/media/Kconfig"
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source "drivers/video/Kconfig"
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source "sound/Kconfig"
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source "drivers/usb/Kconfig"
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source "drivers/mmc/Kconfig"
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source "drivers/infiniband/Kconfig"
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source "drivers/sn/Kconfig"
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endmenu
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