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iio: inv_mpu6050: Check WHO_AM_I register on probe

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This can be used to distinguish mpu6500. This is a warning rather than
an error because the differences are mostly irrelevant and it's nice to
avoid breaking users with slightly incorrect ACPI/DT.

Signed-off-by: Crestez Dan Leonard <leonard.crestez@intel.com>
Acked-by: Ge Gao <ggao@invensense.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Crestez Dan Leonard 2016-04-20 16:15:11 +03:00 committed by Jonathan Cameron
parent 7bdd318159
commit cec0154556
2 changed files with 23 additions and 0 deletions
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15
drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
View File

@ -91,16 +91,19 @@ static const struct inv_mpu6050_chip_config chip_config_6050 = {
/* Indexed by enum inv_devices */
static const struct inv_mpu6050_hw hw_info[] = {
{
.whoami = INV_MPU6050_WHOAMI_VALUE,
.name = "MPU6050",
.reg = &reg_set_6050,
.config = &chip_config_6050,
},
{
.whoami = INV_MPU6500_WHOAMI_VALUE,
.name = "MPU6500",
.reg = &reg_set_6500,
.config = &chip_config_6050,
},
{
.whoami = INV_MPU6000_WHOAMI_VALUE,
.name = "MPU6000",
.reg = &reg_set_6050,
.config = &chip_config_6050,
@ -749,6 +752,7 @@ static const struct iio_info mpu_info = {
static int inv_check_and_setup_chip(struct inv_mpu6050_state *st)
{
int result;
unsigned int regval;
st->hw = &hw_info[st->chip_type];
st->reg = hw_info[st->chip_type].reg;
@ -759,6 +763,17 @@ static int inv_check_and_setup_chip(struct inv_mpu6050_state *st)
if (result)
return result;
msleep(INV_MPU6050_POWER_UP_TIME);
/* check chip self-identification */
result = regmap_read(st->map, INV_MPU6050_REG_WHOAMI, &regval);
if (result)
return result;
if (regval != st->hw->whoami) {
dev_warn(regmap_get_device(st->map),
"whoami mismatch got %#02x expected %#02hhx for %s\n",
regval, st->hw->whoami, st->hw->name);
}
/*
* toggle power state. After reset, the sleep bit could be on
* or off depending on the OTP settings. Toggling power would

8
drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
View File

@ -93,11 +93,13 @@ struct inv_mpu6050_chip_config {
/**
* struct inv_mpu6050_hw - Other important hardware information.
* @whoami: Self identification byte from WHO_AM_I register
* @name: name of the chip.
* @reg: register map of the chip.
* @config: configuration of the chip.
*/
struct inv_mpu6050_hw {
u8 whoami;
u8 *name;
const struct inv_mpu6050_reg_map *reg;
const struct inv_mpu6050_chip_config *config;
@ -215,6 +217,12 @@ struct inv_mpu6050_state {
#define INV_MPU6050_MIN_FIFO_RATE 4
#define INV_MPU6050_ONE_K_HZ 1000
#define INV_MPU6050_REG_WHOAMI 117
#define INV_MPU6000_WHOAMI_VALUE 0x68
#define INV_MPU6050_WHOAMI_VALUE 0x68
#define INV_MPU6500_WHOAMI_VALUE 0x70
/* scan element definition */
enum inv_mpu6050_scan {
INV_MPU6050_SCAN_ACCL_X,