2015-08-10 14:44:14

by yalin wang

Subject: [PATCH] hwmon:change sht15_reverse()

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

Signed-off-by: yalin wang <[email protected]>
---
drivers/hwmon/sht15.c | 20 ++++----------------
1 file changed, 4 insertions(+), 16 deletions(-)

diff --git a/drivers/hwmon/sht15.c b/drivers/hwmon/sht15.c
index 497a7f8..a2fdbb7 100644
--- a/drivers/hwmon/sht15.c
+++ b/drivers/hwmon/sht15.c
@@ -33,6 +33,7 @@
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/atomic.h>
+#include <linux/bitrev.h>

/* Commands */
#define SHT15_MEASURE_TEMP 0x03
@@ -173,19 +174,6 @@ struct sht15_data {
};

/**
- * 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
* @data: sht15 specific data.
* @value: sht15 retrieved data.
@@ -196,7 +184,7 @@ static u8 sht15_crc8(struct sht15_data *data,
const u8 *value,
int len)
{
- u8 crc = sht15_reverse(data->val_status & 0x0F);
+ u8 crc = bitrev8(data->val_status & 0x0F);

while (len--) {
crc = sht15_crc8_table[*value ^ crc];
@@ -477,7 +465,7 @@ static int sht15_update_status(struct sht15_data *data)

if (data->checksumming) {
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[1] = status;
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))
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) ?
SHT15_MEASURE_TEMP : SHT15_MEASURE_RH;
checksum_vals[1] = (u8) (val >> 8);
--
1.9.1

yalin@ubuntu:~/linux-next$

2015-08-10 22:45:53

by Guenter Roeck

Subject: Re: [PATCH] hwmon:change sht15_reverse()

On 08/10/2015 07:41 AM, yalin wang wrote:
>
> This change sht15_reverse() to be generic bitrev8().
>
> Signed-off-by: yalin wang <[email protected]>

Applied to hwmon-next.

Thanks,
Guenter