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iio: dac: mcp4725: Fix i2c_master_send() return value handling

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The i2c_master_send() returns number of sent bytes on success,
or negative on error. The suspend/resume callbacks expect zero
on success and non-zero on error. Adapt the return value of the
i2c_master_send() to the expectation of the suspend and resume
callbacks, including proper validation of the return value.

Fixes: cf35ad61ac ("iio: add mcp4725 I2C DAC driver")
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230511004330.206942-1-marex@denx.de
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Marek Vasut 2023-05-11 02:43:30 +02:00 committed by Jonathan Cameron
parent 56cd3d1c5c
commit 09d3bec700
1 changed files with 14 additions and 2 deletions
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16
drivers/iio/dac/mcp4725.c
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@ -47,12 +47,18 @@ static int mcp4725_suspend(struct device *dev)
struct mcp4725_data *data = iio_priv(i2c_get_clientdata(
to_i2c_client(dev)));
u8 outbuf[2];
int ret;
outbuf[0] = (data->powerdown_mode + 1) << 4;
outbuf[1] = 0;
data->powerdown = true;
return i2c_master_send(data->client, outbuf, 2);
ret = i2c_master_send(data->client, outbuf, 2);
if (ret < 0)
return ret;
else if (ret != 2)
return -EIO;
return 0;
}
static int mcp4725_resume(struct device *dev)
@ -60,13 +66,19 @@ static int mcp4725_resume(struct device *dev)
struct mcp4725_data *data = iio_priv(i2c_get_clientdata(
to_i2c_client(dev)));
u8 outbuf[2];
int ret;
/* restore previous DAC value */
outbuf[0] = (data->dac_value >> 8) & 0xf;
outbuf[1] = data->dac_value & 0xff;
data->powerdown = false;
return i2c_master_send(data->client, outbuf, 2);
ret = i2c_master_send(data->client, outbuf, 2);
if (ret < 0)
return ret;
else if (ret != 2)
return -EIO;
return 0;
}
static DEFINE_SIMPLE_DEV_PM_OPS(mcp4725_pm_ops, mcp4725_suspend,
mcp4725_resume);