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authorJean-Baptiste Maneyrol <jmaneyrol@invensense.com>2018-04-17 10:19:39 +0300
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2018-04-21 18:02:42 +0300
commit7fc01685401a9abfa5d846131fdc3c34b96a0de9 (patch)
tree550906c6f7dc6fb7affe1c581e753b6da1c8776e /drivers/iio
parent918f958987e979813f7c6a75f0aac13167aebab9 (diff)
downloadlinux-7fc01685401a9abfa5d846131fdc3c34b96a0de9.tar.xz
iio: imu: inv_mpu6050: clean set_power_itg and fix usage
Rewrite set_power_itg. Failing when turning power off is no more decreasing the counter now and sleeping only happens when effectively turning the chip on. Fix also usage in init function (setting power on one time is sufficient to ensure chip is effectively on). Signed-off-by: Jean-Baptiste Maneyrol <jmaneyrol@invensense.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/imu/inv_mpu6050/inv_mpu_core.c44
1 files changed, 24 insertions, 20 deletions
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
index 20b94d9a1a22..f3cf32788ea2 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
@@ -191,26 +191,29 @@ int inv_mpu6050_switch_engine(struct inv_mpu6050_state *st, bool en, u32 mask)
int inv_mpu6050_set_power_itg(struct inv_mpu6050_state *st, bool power_on)
{
- int result = 0;
+ int result;
if (power_on) {
- if (!st->powerup_count)
+ if (!st->powerup_count) {
result = regmap_write(st->map, st->reg->pwr_mgmt_1, 0);
- if (!result)
- st->powerup_count++;
+ if (result)
+ return result;
+ usleep_range(INV_MPU6050_REG_UP_TIME_MIN,
+ INV_MPU6050_REG_UP_TIME_MAX);
+ }
+ st->powerup_count++;
} else {
- st->powerup_count--;
- if (!st->powerup_count)
+ if (st->powerup_count == 1) {
result = regmap_write(st->map, st->reg->pwr_mgmt_1,
INV_MPU6050_BIT_SLEEP);
+ if (result)
+ return result;
+ }
+ st->powerup_count--;
}
- if (result)
- return result;
-
- if (power_on)
- usleep_range(INV_MPU6050_REG_UP_TIME_MIN,
- INV_MPU6050_REG_UP_TIME_MAX);
+ dev_dbg(regmap_get_device(st->map), "set power %d, count=%u\n",
+ power_on, st->powerup_count);
return 0;
}
@@ -856,14 +859,11 @@ static int inv_check_and_setup_chip(struct inv_mpu6050_state *st)
msleep(INV_MPU6050_POWER_UP_TIME);
/*
- * toggle power state. After reset, the sleep bit could be on
- * or off depending on the OTP settings. Toggling power would
+ * Turn power on. After reset, the sleep bit could be on
+ * or off depending on the OTP settings. Turning power on
* make it in a definite state as well as making the hardware
* state align with the software state
*/
- result = inv_mpu6050_set_power_itg(st, false);
- if (result)
- return result;
result = inv_mpu6050_set_power_itg(st, true);
if (result)
return result;
@@ -871,13 +871,17 @@ static int inv_check_and_setup_chip(struct inv_mpu6050_state *st)
result = inv_mpu6050_switch_engine(st, false,
INV_MPU6050_BIT_PWR_ACCL_STBY);
if (result)
- return result;
+ goto error_power_off;
result = inv_mpu6050_switch_engine(st, false,
INV_MPU6050_BIT_PWR_GYRO_STBY);
if (result)
- return result;
+ goto error_power_off;
- return 0;
+ return inv_mpu6050_set_power_itg(st, false);
+
+error_power_off:
+ inv_mpu6050_set_power_itg(st, false);
+ return result;
}
int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,