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pmic:i2c: Add I2C sensor byte order (big/little) to PMIC framework

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Since the pmic_reg_read is the u32 value, the order in which bytes
are placed to form u32 value is important.

Support for big and little sensor endianess is added.

Moreover calls to [leXX|beXX]_to_cpu have been added to support
little and big endian SoCs.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
This commit is contained in:
Łukasz Majewski 2012-11-13 03:21:53 +00:00 committed by Anatolij Gustschin
parent b5bf9cafea
commit 86879d7120
2 changed files with 31 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
drivers/misc/pmic_i2c.c
View File

@ -30,6 +30,7 @@
#include <linux/types.h>
#include <pmic.h>
#include <i2c.h>
#include <compiler.h>
int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
{
@ -40,16 +41,27 @@ int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
switch (pmic_i2c_tx_num) {
case 3:
buf[0] = (val >> 16) & 0xff;
buf[1] = (val >> 8) & 0xff;
buf[2] = val & 0xff;
if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) {
buf[2] = (cpu_to_le32(val) >> 16) & 0xff;
buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
buf[0] = cpu_to_le32(val) & 0xff;
} else {
buf[0] = (cpu_to_le32(val) >> 16) & 0xff;
buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
buf[2] = cpu_to_le32(val) & 0xff;
}
break;
case 2:
buf[0] = (val >> 8) & 0xff;
buf[1] = val & 0xff;
if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG) {
buf[1] = (cpu_to_le32(val) >> 8) & 0xff;
buf[0] = cpu_to_le32(val) & 0xff;
} else {
buf[0] = (cpu_to_le32(val) >> 8) & 0xff;
buf[1] = cpu_to_le32(val) & 0xff;
}
break;
case 1:
buf[0] = val & 0xff;
buf[0] = cpu_to_le32(val) & 0xff;
break;
default:
printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);
@ -75,13 +87,21 @@ int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
switch (pmic_i2c_tx_num) {
case 3:
ret_val = buf[0] << 16 | buf[1] << 8 | buf[2];
if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG)
ret_val = le32_to_cpu(buf[2] << 16
| buf[1] << 8 | buf[0]);
else
ret_val = le32_to_cpu(buf[0] << 16 |
buf[1] << 8 | buf[2]);
break;
case 2:
ret_val = buf[0] << 8 | buf[1];
if (p->sensor_byte_order == PMIC_SENSOR_BYTE_ORDER_BIG)
ret_val = le32_to_cpu(buf[1] << 8 | buf[0]);
else
ret_val = le32_to_cpu(buf[0] << 8 | buf[1]);
break;
case 1:
ret_val = buf[0];
ret_val = le32_to_cpu(buf[0]);
break;
default:
printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);

2
include/pmic.h
View File

@ -27,6 +27,7 @@
enum { PMIC_I2C, PMIC_SPI, };
enum { I2C_PMIC, I2C_NUM, };
enum { PMIC_READ, PMIC_WRITE, };
enum { PMIC_SENSOR_BYTE_ORDER_LITTLE, PMIC_SENSOR_BYTE_ORDER_BIG, };
struct p_i2c {
unsigned char addr;
@ -47,6 +48,7 @@ struct pmic {
const char *name;
unsigned char bus;
unsigned char interface;
unsigned char sensor_byte_order;
unsigned char number_of_regs;
union hw {
struct p_i2c i2c;