linux-kernel - Re: [PATCH] NFC: added the sysfs entry for nfcsim workqueue delay

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Date:	Tue, 8 Dec 2015 09:29:48 +0530
From:	Saurabh Sengar <saurabh.truth@...il.com>
To:	lauro.venancio@...nbossa.org, aloisio.almeida@...nbossa.org,
	sameo@...ux.intel.com, linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] NFC: added the sysfs entry for nfcsim workqueue delay

ping again !!

On 1 December 2015 at 21:10, Saurabh Sengar <saurabh.truth@...il.com> wrote:
> pinging for feedback.
> Please respond.
>
> On 20 November 2015 at 16:07, Saurabh Sengar <saurabh.truth@...il.com> wrote:
>> I have also tested this module its successfully creating the tx_delay
>> entry in nfc
>>
>> root@...rabh:/home/saurabh# ls /sys/class/nfc/nfc0/tx_delay
>> /sys/class/nfc/nfc0/tx_delay
>>
>> its default value is set to 5
>> root@...rabh:/home/saurabh# cat /sys/class/nfc/nfc0/tx_delay
>> 5
>>
>> its changing the value correctly
>> root@...rabh:/home/saurabh# echo 15 > /sys/class/nfc/nfc0/tx_delay
>> root@...rabh:/home/saurabh# cat /sys/class/nfc/nfc0/tx_delay
>> 15
>>
>> and on removing the module its cleaning up without any oops
>>
>> Tested-by: Saurabh Sengar <saurabh.truth@...il.com>
>>
>> On 13 November 2015 at 16:48, Saurabh Sengar <saurabh.truth@...il.com> wrote:
>>> added the sysfs entry for nfcsim workqueue delay, as tx_delay
>>>
>>> Signed-off-by: Saurabh Sengar <saurabh.truth@...il.com>
>>> ---
>>> implementing the TODO task
>>>
>>>  drivers/nfc/nfcsim.c | 38 +++++++++++++++++++++++++++++++++++---
>>>  1 file changed, 35 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/nfc/nfcsim.c b/drivers/nfc/nfcsim.c
>>> index 26ac9e5..e77be35 100644
>>> --- a/drivers/nfc/nfcsim.c
>>> +++ b/drivers/nfc/nfcsim.c
>>> @@ -32,6 +32,8 @@
>>>  #define NFCSIM_POLL_TARGET     2
>>>  #define NFCSIM_POLL_DUAL       (NFCSIM_POLL_INITIATOR | NFCSIM_POLL_TARGET)
>>>
>>> +#define TX_DEFAULT_DELAY       5
>>> +
>>>  struct nfcsim {
>>>         struct nfc_dev *nfc_dev;
>>>
>>> @@ -62,12 +64,41 @@ static struct nfcsim *dev1;
>>>
>>>  static struct workqueue_struct *wq;
>>>
>>> +
>>> +static int tx_delay = TX_DEFAULT_DELAY;
>>> +
>>> +static ssize_t show_tx_delay(struct device *dev,
>>> +                                       struct device_attribute *attr,
>>> +                                       char *buf)
>>> +{
>>> +       int n;
>>> +
>>> +       n = scnprintf(buf, PAGE_SIZE, "%d\n", tx_delay);
>>> +       return n;
>>> +}
>>> +
>>> +static ssize_t store_tx_delay(struct device *dev,
>>> +                                       struct device_attribute *attr,
>>> +                                       const char *buf, size_t count)
>>> +{
>>> +       if (kstrtouint(buf, 0, &tx_delay) < 0)
>>> +               return -EINVAL;
>>> +
>>> +       if (tx_delay < 0)
>>> +               return -EINVAL;
>>> +
>>> +       return count;
>>> +}
>>> +
>>> +static DEVICE_ATTR(tx_delay, 0644, show_tx_delay, store_tx_delay);
>>> +
>>>  static void nfcsim_cleanup_dev(struct nfcsim *dev, u8 shutdown)
>>>  {
>>>         DEV_DBG(dev, "shutdown=%d\n", shutdown);
>>>
>>>         mutex_lock(&dev->lock);
>>>
>>> +       device_remove_file(&dev->nfc_dev->dev, &dev_attr_tx_delay);
>>>         dev->polling_mode = NFCSIM_POLL_NONE;
>>>         dev->shutting_down = shutdown;
>>>         dev->cb = NULL;
>>> @@ -320,10 +351,8 @@ static int nfcsim_tx(struct nfc_dev *nfc_dev, struct nfc_target *target,
>>>          * If packet transmission occurs immediately between them, we have a
>>>          * non-stop flow of several tens of thousands SYMM packets per second
>>>          * and a burning cpu.
>>> -        *
>>> -        * TODO: Add support for a sysfs entry to control this delay.
>>>          */
>>> -       queue_delayed_work(wq, &peer->recv_work, msecs_to_jiffies(5));
>>> +       queue_delayed_work(wq, &peer->recv_work, msecs_to_jiffies(tx_delay));
>>>
>>>         mutex_unlock(&peer->lock);
>>>
>>> @@ -461,6 +490,9 @@ static struct nfcsim *nfcsim_init_dev(void)
>>>         if (rc)
>>>                 goto free_nfc_dev;
>>>
>>> +       rc = device_create_file(&dev->nfc_dev->dev, &dev_attr_tx_delay);
>>> +       if (rc)
>>> +               pr_err("error creating sysfs entry\n");
>>>         return dev;
>>>
>>>  free_nfc_dev:
>>> --
>>> 1.9.1
--
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