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iio: gyro: mpu3050: fix chip ID reading 

According to the datasheet, the last bit of CHIP_ID register controls
I2C bus, and the first one is unused. Handle this correctly.

Note that there are chips out there that have a value such that
the id check currently fails.

Signed-off-by: Sergey Larin <cerg2010cerg2010@mail.ru>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
hifive-unleashed-5.1
Sergey Larin 2019-03-02 19:54:55 +03:00 committed by Jonathan Cameron
parent 20ea39ef9f
commit 409a51e0a4
1 changed files with 5 additions and 3 deletions
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8
drivers/iio/gyro/mpu3050-core.c
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@ -29,7 +29,8 @@
#include "mpu3050.h"
#define MPU3050_CHIP_ID 0x69
#define MPU3050_CHIP_ID 0x68
#define MPU3050_CHIP_ID_MASK 0x7E
/*
* Register map: anything suffixed *_H is a big-endian high byte and always
@ -1176,8 +1177,9 @@ int mpu3050_common_probe(struct device *dev,
goto err_power_down;
}
if (val != MPU3050_CHIP_ID) {
dev_err(dev, "unsupported chip id %02x\n", (u8)val);
if ((val & MPU3050_CHIP_ID_MASK) != MPU3050_CHIP_ID) {
dev_err(dev, "unsupported chip id %02x\n",
(u8)(val & MPU3050_CHIP_ID_MASK));
ret = -ENODEV;
goto err_power_down;
}