linux-kernel - Re: [PATCH 08/24] leds: lt3593: Use led_compose

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Message-ID: <6666ef06-c19d-b0d8-a32b-44cecb8bc4b3@gmail.com>
Date:   Wed, 7 Nov 2018 20:49:39 +0100
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Daniel Mack <daniel@...que.org>, linux-leds@...r.kernel.org
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        pavel@....cz, robh@...nel.org
Subject: Re: [PATCH 08/24] leds: lt3593: Use led_compose_name()

On 11/07/2018 08:37 PM, Daniel Mack wrote:
> On 6/11/2018 11:07 PM, Jacek Anaszewski wrote:
>> Switch to using generic LED support for composing LED class
>> device name.
> 
> Thanks for the rework!
> 
>> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@...il.com>
>> ---
>>   drivers/leds/leds-lt3593.c | 19 ++++++++-----------
>>   1 file changed, 8 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/leds/leds-lt3593.c b/drivers/leds/leds-lt3593.c
>> index de3623e..d005abc 100644
>> --- a/drivers/leds/leds-lt3593.c
>> +++ b/drivers/leds/leds-lt3593.c
>> @@ -10,10 +10,10 @@
>>   #include <linux/slab.h>
>>   #include <linux/module.h>
>>   #include <linux/of.h>
>> -#include <uapi/linux/uleds.h>
>> +
>> +#define LED_LT3593_NAME "lt3593"
>>     struct lt3593_led_data {
>> -    char name[LED_MAX_NAME_SIZE];
>>       struct led_classdev cdev;
>>       struct gpio_desc *gpiod;
>>   };
>> @@ -111,6 +111,7 @@ static int lt3593_led_probe(struct platform_device
>> *pdev)
>>       struct fwnode_handle *child;
>>       int ret, state = LEDS_GPIO_DEFSTATE_OFF;
>>       enum gpiod_flags flags = GPIOD_OUT_LOW;
>> +    struct led_init_data init_data;
>>       const char *tmp;
>>         if (dev_get_platdata(dev)) {
>> @@ -138,14 +139,11 @@ static int lt3593_led_probe(struct
>> platform_device *pdev)
>>           return PTR_ERR(led_data->gpiod);
>>         child = device_get_next_child_node(dev, NULL);
>> +    init_data.fwnode = child;
> 
> Not quite following. `fwnode' is the only member of that struct that is
> initialized?
> 
>>   -    ret = fwnode_property_read_string(child, "label", &tmp);
>> -    if (ret < 0)
>> -        snprintf(led_data->name, sizeof(led_data->name),
>> -             "lt3593::");
>> -    else
>> -        snprintf(led_data->name, sizeof(led_data->name),
>> -             "lt3593:%s", tmp);
>> +    ret = led_compose_name(child, LED_LT3593_NAME, ":", init_data.name);
> 
> ... and here, a member that wasn't written before is used? What am I
> missing?

init_data.name pointer is passed to led_compose_name(), which fills
this array with the composed name.

-- 
Best regards,
Jacek Anaszewski