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hwmon:change sht15_reverse()

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This change sht15_reverse() to be generic bitrev8().

Signed-off-by: yalin wang <yalin.wang2010@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
yalin wang 2015-08-10 22:41:43 +08:00 • committed by Guenter Roeck
parent cfca3789e0
commit 33836ee985
1 changed files with 4 additions and 16 deletions
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20
drivers/hwmon/sht15.c
View file

@ -33,6 +33,7 @@
#include <linux/regulator/consumer.h> #include <linux/regulator/consumer.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/atomic.h> #include <linux/atomic.h>
#include <linux/bitrev.h>
/* Commands */ /* Commands */
#define SHT15_MEASURE_TEMP 0x03 #define SHT15_MEASURE_TEMP 0x03
@ -172,19 +173,6 @@ struct sht15_data {
atomic_t interrupt_handled; atomic_t interrupt_handled;
}; };
/**
* sht15_reverse() - reverse a byte
* @byte: byte to reverse.
*/
static u8 sht15_reverse(u8 byte)
{
u8 i, c;
for (c = 0, i = 0; i < 8; i++)
c |= (!!(byte & (1 << i))) << (7 - i);
return c;
}
/** /**
* sht15_crc8() - compute crc8 * sht15_crc8() - compute crc8
* @data: sht15 specific data. * @data: sht15 specific data.
@ -196,7 +184,7 @@ static u8 sht15_crc8(struct sht15_data *data,
const u8 *value, const u8 *value,
int len) int len)
{ {
u8 crc = sht15_reverse(data->val_status & 0x0F); u8 crc = bitrev8(data->val_status & 0x0F);
while (len--) { while (len--) {
crc = sht15_crc8_table[*value ^ crc]; crc = sht15_crc8_table[*value ^ crc];
@ -477,7 +465,7 @@ static int sht15_update_status(struct sht15_data *data)
if (data->checksumming) { if (data->checksumming) {
sht15_ack(data); sht15_ack(data);
dev_checksum = sht15_reverse(sht15_read_byte(data)); dev_checksum = bitrev8(sht15_read_byte(data));
checksum_vals[0] = SHT15_READ_STATUS; checksum_vals[0] = SHT15_READ_STATUS;
checksum_vals[1] = status; checksum_vals[1] = status;
data->checksum_ok = (sht15_crc8(data, checksum_vals, 2) data->checksum_ok = (sht15_crc8(data, checksum_vals, 2)
@ -864,7 +852,7 @@ static void sht15_bh_read_data(struct work_struct *work_s)
*/ */
if (sht15_ack(data)) if (sht15_ack(data))
goto wakeup; goto wakeup;
dev_checksum = sht15_reverse(sht15_read_byte(data)); dev_checksum = bitrev8(sht15_read_byte(data));
checksum_vals[0] = (data->state == SHT15_READING_TEMP) ? checksum_vals[0] = (data->state == SHT15_READING_TEMP) ?
SHT15_MEASURE_TEMP : SHT15_MEASURE_RH; SHT15_MEASURE_TEMP : SHT15_MEASURE_RH;
checksum_vals[1] = (u8) (val >> 8); checksum_vals[1] = (u8) (val >> 8);