linux-kernel - Re: [PATCH] iio: magnetometer: mag3110: claim direct mode during raw writes

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Date:   Sat, 21 Jan 2017 12:21:16 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Alison Schofield <amsfield22@...il.com>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: magnetometer: mag3110: claim direct mode during raw
 writes

On 21/01/17 09:43, Peter Meerwald-Stadler wrote:
> 
>> Driver was checking for direct mode but not locking it.  Use
>> claim/release helper functions to guarantee the device stays
>> in direct mode during raw writes.
> 
> looks good,
> Acked-by: Peter Meerwald-Stadler <pmeerw@...erw.net>
Applied to the togreg branch of iio.git - initially pushed out as testing etc..

Jonathan
> 
>> Signed-off-by: Alison Schofield <amsfield22@...il.com>
>> ---
>>  drivers/iio/magnetometer/mag3110.c | 30 ++++++++++++++++++++----------
>>  1 file changed, 20 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/iio/magnetometer/mag3110.c b/drivers/iio/magnetometer/mag3110.c
>> index f2b3bd7..b4f643f 100644
>> --- a/drivers/iio/magnetometer/mag3110.c
>> +++ b/drivers/iio/magnetometer/mag3110.c
>> @@ -222,29 +222,39 @@ static int mag3110_write_raw(struct iio_dev *indio_dev,
>>  			     int val, int val2, long mask)
>>  {
>>  	struct mag3110_data *data = iio_priv(indio_dev);
>> -	int rate;
>> +	int rate, ret;
>>  
>> -	if (iio_buffer_enabled(indio_dev))
>> -		return -EBUSY;
>> +	ret = iio_device_claim_direct_mode(indio_dev);
>> +	if (ret)
>> +		return ret;
>>  
>>  	switch (mask) {
>>  	case IIO_CHAN_INFO_SAMP_FREQ:
>>  		rate = mag3110_get_samp_freq_index(data, val, val2);
>> -		if (rate < 0)
>> -			return -EINVAL;
>> +		if (rate < 0) {
>> +			ret = -EINVAL;
>> +			break;
>> +		}
>>  
>>  		data->ctrl_reg1 &= ~MAG3110_CTRL_DR_MASK;
>>  		data->ctrl_reg1 |= rate << MAG3110_CTRL_DR_SHIFT;
>> -		return i2c_smbus_write_byte_data(data->client,
>> +		ret = i2c_smbus_write_byte_data(data->client,
>>  			MAG3110_CTRL_REG1, data->ctrl_reg1);
>> +		break;
>>  	case IIO_CHAN_INFO_CALIBBIAS:
>> -		if (val < -10000 || val > 10000)
>> -			return -EINVAL;
>> -		return i2c_smbus_write_word_swapped(data->client,
>> +		if (val < -10000 || val > 10000) {
>> +			ret = -EINVAL;
>> +			break;
>> +		}
>> +		ret = i2c_smbus_write_word_swapped(data->client,
>>  			MAG3110_OFF_X + 2 * chan->scan_index, val << 1);
>> +		break;
>>  	default:
>> -		return -EINVAL;
>> +		ret = -EINVAL;
>> +		break;
>>  	}
>> +	iio_device_release_direct_mode(indio_dev);
>> +	return ret;
>>  }
>>  
>>  static irqreturn_t mag3110_trigger_handler(int irq, void *p)
>>
>