Return-path: Received: from mail-pa0-f52.google.com ([209.85.220.52]:36212 "EHLO mail-pa0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751442AbbKMLSe (ORCPT ); Fri, 13 Nov 2015 06:18:34 -0500 From: Saurabh Sengar To: lauro.venancio@openbossa.org, aloisio.almeida@openbossa.org, sameo@linux.intel.com, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Saurabh Sengar Subject: [PATCH] NFC: added the sysfs entry for nfcsim workqueue delay Date: Fri, 13 Nov 2015 16:48:19 +0530 Message-Id: <1447413499-25747-1-git-send-email-saurabh.truth@gmail.com> (sfid-20151113_121933_539801_234610A4) Sender: linux-wireless-owner@vger.kernel.org List-ID: added the sysfs entry for nfcsim workqueue delay, as tx_delay Signed-off-by: Saurabh Sengar --- 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