linux-kernel - Re: [PATCHv2 1/5] misc: Driver for bh1770glc / sfh7770 ALS and proximity sensor

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Date:	Mon, 11 Oct 2010 14:35:17 +0100
From:	Jonathan Cameron <jic23@....ac.uk>
To:	samu.p.onkalo@...ia.com
CC:	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCHv2 1/5] misc: Driver for bh1770glc / sfh7770 ALS and proximity
 sensor

On 10/11/10 07:16, Onkalo Samu wrote:
> 
> I have a question about one of your comment
> 
> On Fri, 2010-10-08 at 16:35 +0200, ext Jonathan Cameron wrote:
>> On 10/08/10 14:42, Samu Onkalo wrote:
>>> This is a driver for ROHM BH1770GLC and OSRAM SFH7770 combined
>>> ALS and proximity sensor.
>>>
>>> Interface is sysfs based. The driver uses interrupts to provide new data.
>>> The driver supports pm_runtime and regulator frameworks.
>>>
>>> See Documentation/misc-devices/bhsfh.txt for details
>>
>> Couple of nitpicks / formatting suggestions inline.
>>
>>>
>>> +/* chip->mutex is kept when this is called */
>>> +static int bhsfh_lux_update_thresholds(struct bhsfh_chip *chip,
>>> +                                     u16 threshold_hi, u16 threshold_lo)
>>> +{
>>> +     u8 data[4];
>>
>> u8 data[4] = { threshold_hi,
>>    threshold_hi >> 8,
>>    threshold_lo,
>>    threshold_low >> 8};
>> and loose the below will give same result.
> 
> What do you mean by that? Threshold_lo / threshold_hi parameters can be
> modified before they are stored to HW.
> 
>>> +     int ret;
>>> +
>>> +     /* sysfs may call this when the chip is powered off */
>>> +     if (pm_runtime_suspended(&chip->client->dev))
>>> +             return 0;
>>> +
>>> +     /*
>>> +      * Compensate threshold values with the correction factors if not
>>> +      * set to minimum or maximum.
>>> +      * Min & max values disables interrupts.
>>> +      */
>>> +     if (threshold_hi != BHSFH_LUX_RANGE && threshold_hi != 0)
>>> +             threshold_hi = bhsfh_lux_adjusted_to_raw(chip, threshold_hi);
>>> +
>>> +     if (threshold_lo != BHSFH_LUX_RANGE && threshold_lo != 0)
>>> +             threshold_lo = bhsfh_lux_adjusted_to_raw(chip, threshold_lo);
> 
> Code above can modify values.
ah.  Sorry, I was clearly half asleep when I reviewed this!
> 
>>> +
>>> +     if (chip->lux_thres_hi_onchip == threshold_hi &&
>>> +         chip->lux_thres_lo_onchip == threshold_lo)
>>> +             return 0;
>>> +
>>> +     chip->lux_thres_hi_onchip = threshold_hi;
>>> +     chip->lux_thres_lo_onchip = threshold_lo;
>>> +
>>> +     data[0] = threshold_hi;
>>> +     data[1] = threshold_hi >> 8;
>>> +     data[2] = threshold_lo;
>>> +     data[3] = threshold_lo >> 8;
>>> +
>>> +     ret = i2c_smbus_write_i2c_block_data(chip->client,
>>> +                                     BHSFH_ALS_TH_UP_0,
>>> +                                     ARRAY_SIZE(data),
>>> +                                     data);
>>> +     return ret;
>>> +}
>>> +
> 
> 
> 
> 

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