diff options
| author | Łukasz Majewski <l.majewski@samsung.com> | 2012-11-13 03:21:53 +0000 |
|---|---|---|
| committer | Anatolij Gustschin <agust@denx.de> | 2012-11-14 11:21:07 +0100 |
| commit | 86879d7120ab4000d924b12315c01d57506af832 (patch) | |
| tree | 15eaff3cf40bbebbde4914d88c3890a6530b48ba | |
| parent | b5bf9cafea246a6572c122bb3971cb48f50fc9ce (diff) | |
pmic:i2c: Add I2C sensor byte order (big/little) to PMIC framework
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>
| -rw-r--r-- | drivers/misc/pmic_i2c.c | 38 | ||||
| -rw-r--r-- | include/pmic.h | 2 |
2 files changed, 31 insertions, 9 deletions
diff --git a/drivers/misc/pmic_i2c.c b/drivers/misc/pmic_i2c.c index e74c3727cd..1064bfe993 100644 --- a/drivers/misc/pmic_i2c.c +++ b/drivers/misc/pmic_i2c.c @@ -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); diff --git a/include/pmic.h b/include/pmic.h index 6a05b40aef..1a2db05110 100644 --- a/include/pmic.h +++ b/include/pmic.h @@ -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; |