linux-toradex.git/drivers/spi/spi.c, branch v2.6.32.7

spi: handle TX-only/RX-only

2009-09-23T14:39:44+00:00

Support two new half-duplex SPI implementation restrictions, for links
that talk to TX-only or RX-only devices.  (Existing half-duplex flavors
support both transfer directions, just not at the same time.)

Move spi_async() into the spi.c core, and stop inlining it.  Then make
that function perform error checks and reject messages that demand more
than the underlying controller can support.

Based on a patch from Marek Szyprowski which did this only for the
bitbanged GPIO driver.

Cc: Marek Szyprowski 
Signed-off-by: David Brownell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

spi: prefix modalias with "spi:"

2009-09-23T14:39:43+00:00

This makes it consistent with other buses (platform, i2c, vio, ...).  I'm
not sure why we use the prefixes, but there must be a reason.

This was easy enough to do it, and I did it.

Signed-off-by: Anton Vorontsov 
Cc: David Brownell 
Cc: David Woodhouse 
Cc: Grant Likely 
Cc: Jean Delvare 
Cc: Ben Dooks 
Cc: Benjamin Herrenschmidt 
Cc: Dmitry Torokhov 
Cc: Samuel Ortiz 
Cc: "John W. Linville" 
Acked-by: Mike Frysinger 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

spi: add support for device table matching

2009-09-23T14:39:43+00:00

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 
Cc: David Brownell 
Cc: David Woodhouse 
Cc: Grant Likely 
Cc: Jean Delvare 
Cc: Ben Dooks 
Cc: Benjamin Herrenschmidt 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

spi: fix spi_write_then_read() comment

2009-06-18T20:03:42+00:00

Buffer needs not be dma-safe, not rx data length.

Signed-off-by: Jiri Pirko 
Cc: David Brownell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

spi: move more spi_setup() functionality into core

2009-06-18T20:03:42+00:00

Move some common spi_setup() error checks into the SPI framework from the
spi_master controller drivers:

 - Add a new "mode_bits" field to spi_master

 - Use that in spi_setup to validate the spi->mode value being
   requested.  Setting this new field is now mandatory for any
   controller supporting more than vanilla SPI_MODE_0.

 - Update all spi_master drivers to:

     * Initialize that field
     * Remove current spi_setup() checks using that value.

This is a net minor code shrink.

Signed-off-by: David Brownell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

spi: move common spi_setup() functionality into core

2009-06-18T20:03:42+00:00

Start moving some spi_setup() functionality into the SPI core from the
various spi_master controller drivers:

 - Make that function stop being an inline;

 - Move two common idioms from drivers into that new function:
    * Default bits_per_word to 8 if that field isn't set
    * Issue a standardized dev_dbg() message

This is a net minor source code shrink, and supports enhancments found in
some follow-up patches.

Signed-off-by: David Brownell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

spi: spi_write_then_read() bugfixes

2009-04-13T22:04:30+00:00

The "simplify spi_write_then_read()" patch included two regressions from
the 2.6.27 behaviors:

 - The data it wrote out during the (full duplex) read side
   of the transfer was not zeroed.

 - It fails completely on half duplex hardware, such as
   Microwire and most "3-wire" SPI variants.

So, revert that patch.  A revised version should be submitted at some
point, which can get the speedup on standard hardware (full duplex)
without breaking on less-capable half-duplex stuff.

Signed-off-by: David Brownell 
Cc: 		[2.6.28.x, 2.6.29.x]
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

spi: struct device - replace bus_id with dev_name(), dev_set_name()

2009-01-06T18:44:37+00:00

Acked-by: David Brownell 
Signed-off-by: Kay Sievers 
Signed-off-by: Greg Kroah-Hartman

spi: core and gpio expanders use subsys_init

2008-10-16T18:21:38+00:00

Make the SPI external GPIO expander drivers register themselves at
subsys_initcall() time when they're statically linked, and make the SPI
core do its driver model initialization earlier so that's safe.

SOC-integrated GPIOs are available starting very early -- often before
initcalls start to run, or earily in arch_initcall() at latest -- so this
improves consistency, letting more subsystems rely on GPIOs being usable
by their own subsys_initcall() code.

Signed-off-by: David Brownell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

spi: simplify spi_write_then_read()

2008-10-16T18:21:38+00:00

Modify spi_write_then_read() to use one transfer.  This speeds up all
callers, and is a minor code shrink.

Signed-off-by: Vernon Sauder 
Signed-off-by: David Brownell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds