I have also tested this module its successfully creating the tx_delay
entry in nfc
root@saurabh:/home/saurabh# ls /sys/class/nfc/nfc0/tx_delay
/sys/class/nfc/nfc0/tx_delay
its default value is set to 5
root@saurabh:/home/saurabh# cat /sys/class/nfc/nfc0/tx_delay
5
its changing the value correctly
root@saurabh:/home/saurabh# echo 15 > /sys/class/nfc/nfc0/tx_delay
root@saurabh:/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@xxxxxxxxx>
On 13 November 2015 at 16:48, Saurabh Sengar <saurabh.truth@xxxxxxxxx> wrote:
> added the sysfs entry for nfcsim workqueue delay, as tx_delay
>
> Signed-off-by: Saurabh Sengar <saurabh.truth@xxxxxxxxx>
> ---
> 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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