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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>
This commit is contained in:
Slawomir Stepien 2018-10-18 20:59:33 +02:00 committed by Jonathan Cameron
parent 0559ef7fde
commit 4cd62a5425
2 changed files with 4 additions and 21 deletions
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1
drivers/staging/iio/adc/Kconfig
View File

@ -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.

24
drivers/staging/iio/adc/ad7280a.c
View File

@ -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;