Lars-Peter Clausen 6d9eecd418 spi: Add helper functions for setting up transfers ... Quite often the pattern used for setting up and transferring a synchronous SPI transaction looks very much like the following: struct spi_message msg; struct spi_transfer xfers[] = { ... }; spi_message_init(&msg); spi_message_add_tail(&xfers[0], &msg); ... spi_message_add_tail(&xfers[ARRAY_SIZE(xfers) - 1], &msg); ret = spi_sync(&msg); This patch adds two new helper functions for handling this case. The first helper function spi_message_init_with_transfers() takes a spi_message and an array of spi_transfers. It will initialize the message and then call spi_message_add_tail() for each transfer in the array. E.g. the following spi_message_init(&msg); spi_message_add_tail(&xfers[0], &msg); ... spi_message_add_tail(&xfers[ARRAY_SIZE(xfers) - 1], &msg); can be rewritten as spi_message_init_with_transfers(&msg, xfers, ARRAY_SIZE(xfers)); The second function spi_sync_transfer() takes a SPI device and an array of spi_transfers. It will allocate a new spi_message (on the stack) and add all transfers in the array to the message. Finally it will call spi_sync() on the message. E.g. the follwing struct spi_message msg; struct spi_transfer xfers[] = { ... }; spi_message_init(&msg); spi_message_add_tail(&xfers[0], &msg); ... spi_message_add_tail(&xfers[ARRAY_SIZE(xfers) - 1], &msg); ret = spi_sync(spi, &msg); can be rewritten as struct spi_transfer xfers[] = { ... }; ret = spi_sync_transfer(spi, xfers, ARRAY_SIZE(xfers)); A coccinelle script to find such instances will follow. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>		2013-02-09 11:02:07 +00:00
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74x164.h
ad7877.h
ad7879.h
ads7846.h	Input: ads7846 - enable pendown GPIO debounce time setting	2012-11-21 13:09:56 -08:00
at73c213.h
at86rf230.h
corgi_lcd.h
ds1305.h
eeprom.h
flash.h
ifx_modem.h
l4f00242t03.h
libertas_spi.h
lms283gf05.h
max7301.h
mc33880.h
mcp23s08.h
mmc_spi.h
mxs-spi.h	mmc: spi: Pull out common DMA parts from MXS MMC	2012-08-17 22:54:15 +01:00
pxa2xx_spi.h
rspi.h
s3c24xx.h
sh_hspi.h
sh_msiof.h
spi-tegra.h	spi: tegra: add spi driver for SLINK controller	2012-10-30 18:38:35 +00:00
spi.h	spi: Add helper functions for setting up transfers	2013-02-09 11:02:07 +00:00
spi_bitbang.h
spi_gpio.h
spi_oc_tiny.h
tdo24m.h
tle62x0.h
tsc2005.h	spi: tsc2005: delete soon-obsolete e-mail address	2012-10-17 16:32:46 +09:00
xilinx_spi.h