staging:iio:magnetometer:ak8975: Don't assume 0 is an invalid GPIO

gpio_is_valid() is the defined mechanism to determine whether a GPIO is
valid. Use this instead of assuming that 0 is an invalid GPIO.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Andrew Chew <achew@nvidia.com>
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/iio/magnetometer/ak8975.c b/drivers/staging/iio/magnetometer/ak8975.c
index 0e66d3f080b04b28110cbaa63cc9636443761f43..9c5338396d7eb856ba33e5c8f44393ec6c6db43a 100644 (file)
--- a/drivers/staging/iio/magnetometer/ak8975.c
+++ b/drivers/staging/iio/magnetometer/ak8975.c
@@ -373,7 +373,7 @@ static int ak8975_read_axis(struct iio_dev *indio_dev, int index, int *val)
        }
 
        /* Wait for the conversion to complete. */
-       if (data->eoc_gpio)
+       if (gpio_is_valid(data->eoc_gpio))
                ret = wait_conversion_complete_gpio(data);
        else
                ret = wait_conversion_complete_polled(data);
@@ -484,7 +484,7 @@ static int ak8975_probe(struct i2c_client *client,
 
        /* We may not have a GPIO based IRQ to scan, that is fine, we will
           poll if so */
-       if (eoc_gpio > 0) {
+       if (gpio_is_valid(eoc_gpio)) {
                err = gpio_request(eoc_gpio, "ak_8975");
                if (err < 0) {
                        dev_err(&client->dev,
@@ -500,8 +500,7 @@ static int ak8975_probe(struct i2c_client *client,
                                                eoc_gpio, err);
                        goto exit_gpio;
                }
-       } else
-               eoc_gpio = 0;   /* No GPIO available */
+       }
 
        /* Register with IIO */
        indio_dev = iio_allocate_device(sizeof(*data));
@@ -537,7 +536,7 @@ static int ak8975_probe(struct i2c_client *client,
 exit_free_iio:
        iio_free_device(indio_dev);
 exit_gpio:
-       if (eoc_gpio)
+       if (gpio_is_valid(eoc_gpio))
                gpio_free(eoc_gpio);
 exit:
        return err;
@@ -551,7 +550,7 @@ static int ak8975_remove(struct i2c_client *client)
 
        iio_device_unregister(indio_dev);
 
-       if (eoc_gpio)
+       if (gpio_is_valid(eoc_gpio))
                gpio_free(eoc_gpio);
 
        return 0;