linux-kernel - Re: [PATCH v2 3/6] power: bq27xxx_battery: Platform initialization must declare a device

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Message-ID: <55BA5857.9030301@ti.com>
Date:	Thu, 30 Jul 2015 12:01:11 -0500
From:	"Andrew F. Davis" <afd@...com>
To:	Pali Rohár <pali.rohar@...il.com>
CC:	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Dan Murphy <dmurphy@...com>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/6] power: bq27xxx_battery: Platform initialization
 must declare a device

On 07/28/2015 03:13 PM, Pali Rohár wrote:
> On Tuesday 28 July 2015 21:39:10 Andrew F. Davis wrote:
>> When initialized as a platform device the initializer must now specify
>> a device. An empty device name is no longer valid.
>>
>> Signed-off-by: Andrew F. Davis <afd@...com>
>> ---
>>   drivers/power/bq27xxx_battery.c       | 9 ++++++---
>>   drivers/w1/slaves/w1_bq27000.c        | 1 +
>>   include/linux/power/bq27xxx_battery.h | 6 +++++-
>>   3 files changed, 12 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/power/bq27xxx_battery.c b/drivers/power/bq27xxx_battery.c
>> index e72055c..0734413 100644
>> --- a/drivers/power/bq27xxx_battery.c
>> +++ b/drivers/power/bq27xxx_battery.c
>> @@ -91,8 +91,6 @@ struct bq27xxx_access_methods {
>>   	int (*read)(struct bq27xxx_device_info *di, u8 reg, bool single);
>>   };
>>
>> -enum bq27xxx_chip { BQ27000, BQ27500, BQ27425, BQ27742, BQ27510};
>> -
>>   struct bq27xxx_reg_cache {
>>   	int temperature;
>>   	int time_to_empty;
>> @@ -1036,6 +1034,11 @@ static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
>>   		return -EINVAL;
>>   	}
>>
>> +	if (!pdata->chip) {
>
> Will this work?
>
> Is not first value of enum equal to zero? BQ27000 == 0 ?
>

We could set the enum to start at 1, but I'm not sure if this check is 
really necessary at all as we can just assume if the platform info has 
been supplied then the chip has been set.

>> +		dev_err(&pdev->dev, "no device supplied\n");
>> +		return -EINVAL;
>> +	}
>> +
>>   	di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
>>   	if (!di)
>>   		return -ENOMEM;
>> @@ -1043,7 +1046,7 @@ static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
>>   	platform_set_drvdata(pdev, di);
>>
>>   	di->dev = &pdev->dev;
>> -	di->chip = BQ27000;
>> +	di->chip = pdata->chip;
>>
>>   	name = pdata->name ?: dev_name(&pdev->dev);
>>   	di->bus.read = &bq27xxx_battery_platform_read;
>> diff --git a/drivers/w1/slaves/w1_bq27000.c b/drivers/w1/slaves/w1_bq27000.c
>> index 8480531..ba8bf3d 100644
>> --- a/drivers/w1/slaves/w1_bq27000.c
>> +++ b/drivers/w1/slaves/w1_bq27000.c
>> @@ -42,6 +42,7 @@ static int w1_bq27000_read(struct device *dev, unsigned int reg)
>>   static struct bq27xxx_platform_data bq27000_battery_info = {
>>   	.read   = w1_bq27000_read,
>>   	.name   = "bq27000-battery",
>> +	.chip	= BQ27000,
>            ^
> Just small problem, but for me visible different spacing of previous lines
>

Fixed.

>>   };
>>
>>   static int w1_bq27000_add_slave(struct w1_slave *sl)
>> diff --git a/include/linux/power/bq27xxx_battery.h b/include/linux/power/bq27xxx_battery.h
>> index e70a93a..70d3865 100644
>> --- a/include/linux/power/bq27xxx_battery.h
>> +++ b/include/linux/power/bq27xxx_battery.h
>> @@ -3,7 +3,8 @@
>>
>>   /**
>>    * struct bq27xxx_plaform_data - Platform data for bq27xxx devices
>> - * @name: Name of the battery. If NULL the driver will fallback to "bq27000".
>> + * @name: Name of the battery.
>
> Now I'm trying to understand what name = NULL will do...
>
> It is this above code?
>
>    	name = pdata->name ?: dev_name(&pdev->dev);
>
> Then it looks like it just set device name. Maybe stupid question, but do we need such property? What other people think?
>

It doesn't look necessary to me.

>> + * @chip: Chip class number of this device.
>>    * @read: HDQ read callback.
>>    *	This function should provide access to the HDQ bus the battery is
>>    *	connected to.
>> @@ -11,8 +12,11 @@
>>    *	register to be read. The return value should either be the content of
>>    *	the passed register or an error value.
>>    */
>> +enum bq27xxx_chip { BQ27000, BQ27500, BQ27425, BQ27742, BQ27510 };
>> +
>>   struct bq27xxx_platform_data {
>>   	const char *name;
>> +	enum bq27xxx_chip chip;
>>   	int (*read)(struct device *dev, unsigned int);
>>   };
>>
>>
>
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