diff options
| author | Slawomir Stepien <sst@poczta.fm> | 2018-10-18 20:59:33 +0200 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2018-10-21 14:30:56 +0100 |
| commit | 4cd62a5425115ad14b54f2c7dece597c0c57d701 (patch) | |
| tree | 212db963f2fb07ebf9e24c092b2fd9162a016f28 /drivers/staging/iio | |
| parent | 0559ef7fde67bc6c83c6eb6329dbd6649528263e (diff) | |
| download | linux-4cd62a5425115ad14b54f2c7dece597c0c57d701.tar.bz2 | |
staging: iio: adc: ad7280a: use crc8.h API to build crc table
The custom build function ad7280_crc8_build_table is not needed. The
crc8_populate_msb function from linux/crc8.h will build the same crc
table.
Signed-off-by: Slawomir Stepien <sst@poczta.fm>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/staging/iio')
| -rw-r--r-- | drivers/staging/iio/adc/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7280a.c | 24 |
2 files changed, 4 insertions, 21 deletions
diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig index 9d3062a07460..fc23059f1673 100644 --- a/drivers/staging/iio/adc/Kconfig +++ b/drivers/staging/iio/adc/Kconfig @@ -73,6 +73,7 @@ config AD7192 config AD7280 tristate "Analog Devices AD7280A Lithium Ion Battery Monitoring System" depends on SPI + select CRC8 help Say yes here to build support for Analog Devices AD7280A Lithium Ion Battery Monitoring System. diff --git a/drivers/staging/iio/adc/ad7280a.c b/drivers/staging/iio/adc/ad7280a.c index cbeb52485a31..7161998c8a0e 100644 --- a/drivers/staging/iio/adc/ad7280a.c +++ b/drivers/staging/iio/adc/ad7280a.c @@ -6,6 +6,7 @@ * Licensed under the GPL-2. */ +#include <linux/crc8.h> #include <linux/device.h> #include <linux/kernel.h> #include <linux/slab.h> @@ -121,8 +122,6 @@ static unsigned int ad7280a_devaddr(unsigned int addr) * P(x) = x^8 + x^5 + x^3 + x^2 + x^1 + x^0 = 0b100101111 => 0x2F */ #define POLYNOM 0x2F -#define POLYNOM_ORDER 8 -#define HIGHBIT (1 << (POLYNOM_ORDER - 1)) struct ad7280_state { struct spi_device *spi; @@ -131,7 +130,7 @@ struct ad7280_state { int slave_num; int scan_cnt; int readback_delay_us; - unsigned char crc_tab[256]; + unsigned char crc_tab[CRC8_TABLE_SIZE]; unsigned char ctrl_hb; unsigned char ctrl_lb; unsigned char cell_threshhigh; @@ -144,23 +143,6 @@ struct ad7280_state { __be32 buf[2] ____cacheline_aligned; }; -static void ad7280_crc8_build_table(unsigned char *crc_tab) -{ - unsigned char bit, crc; - int cnt, i; - - for (cnt = 0; cnt < 256; cnt++) { - crc = cnt; - for (i = 0; i < 8; i++) { - bit = crc & HIGHBIT; - crc <<= 1; - if (bit) - crc ^= POLYNOM; - } - crc_tab[cnt] = crc; - } -} - static unsigned char ad7280_calc_crc8(unsigned char *crc_tab, unsigned int val) { unsigned char crc; @@ -866,7 +848,7 @@ static int ad7280_probe(struct spi_device *spi) if (!pdata) pdata = &ad7793_default_pdata; - ad7280_crc8_build_table(st->crc_tab); + crc8_populate_msb(st->crc_tab, POLYNOM); st->spi->max_speed_hz = AD7280A_MAX_SPI_CLK_HZ; st->spi->mode = SPI_MODE_1; |