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authorThierry Escande <thierry.escande@collabora.com>2016-07-19 11:58:16 +0200
committerSamuel Ortiz <sameo@linux.intel.com>2016-07-19 23:23:29 +0200
commitf9ac6273e5b8fa45e7cd2086e1bbc91af9af7f19 (patch)
treedd87d826858e81638aabe14bbb5b0c5a24afeb8a
parentd85a301c26621d3466956dc477c32c20c15a52ee (diff)
NFC: nfcsim: Add support for sysfs control entry
The idea is to have a way to control and/or modify the behavior of the nfcsim virtual devices. This patch creates a folder tree in the debug filesystem. The debugfs is usually mounted into /sys/kernel/debug and the nfcsim entries are located in DEBUGFS/nfcsim/nfcX/ where X is either 0 or 1 depending on the device you want to address. These folders are empty for now and control entries will be added by upcoming commits. Signed-off-by: Thierry Escande <thierry.escande@collabora.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
-rw-r--r--drivers/nfc/nfcsim.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/nfc/nfcsim.c b/drivers/nfc/nfcsim.c
index 40b4846..97067a5 100644
--- a/drivers/nfc/nfcsim.c
+++ b/drivers/nfc/nfcsim.c
@@ -16,6 +16,8 @@
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/ctype.h>
+#include <linux/debugfs.h>
#include <linux/nfc.h>
#include <net/nfc/nfc.h>
#include <net/nfc/digital.h>
@@ -329,6 +331,49 @@ static struct nfc_digital_ops nfcsim_digital_ops = {
.switch_rf = nfcsim_switch_rf,
};
+static struct dentry *nfcsim_debugfs_root;
+
+static void nfcsim_debugfs_init(void)
+{
+ nfcsim_debugfs_root = debugfs_create_dir("nfcsim", NULL);
+
+ if (!nfcsim_debugfs_root)
+ pr_err("Could not create debugfs entry\n");
+
+}
+
+static void nfcsim_debugfs_remove(void)
+{
+ debugfs_remove_recursive(nfcsim_debugfs_root);
+}
+
+static void nfcsim_debugfs_init_dev(struct nfcsim *dev)
+{
+ struct dentry *dev_dir;
+ char devname[5]; /* nfcX\0 */
+ u32 idx;
+ int n;
+
+ if (!nfcsim_debugfs_root) {
+ NFCSIM_ERR(dev, "nfcsim debugfs not initialized\n");
+ return;
+ }
+
+ idx = dev->nfc_digital_dev->nfc_dev->idx;
+ n = snprintf(devname, sizeof(devname), "nfc%d", idx);
+ if (n >= sizeof(devname)) {
+ NFCSIM_ERR(dev, "Could not compute dev name for dev %d\n", idx);
+ return;
+ }
+
+ dev_dir = debugfs_create_dir(devname, nfcsim_debugfs_root);
+ if (!dev_dir) {
+ NFCSIM_ERR(dev, "Could not create debugfs entries for nfc%d\n",
+ idx);
+ return;
+ }
+}
+
static struct nfcsim *nfcsim_device_new(struct nfcsim_link *link_in,
struct nfcsim_link *link_out)
{
@@ -366,6 +411,8 @@ static struct nfcsim *nfcsim_device_new(struct nfcsim_link *link_in,
return ERR_PTR(rc);
}
+ nfcsim_debugfs_init_dev(dev);
+
return dev;
}
@@ -400,6 +447,8 @@ static int __init nfcsim_init(void)
goto exit_err;
}
+ nfcsim_debugfs_init();
+
dev0 = nfcsim_device_new(link0, link1);
if (IS_ERR(dev0)) {
rc = PTR_ERR(dev0);
@@ -439,6 +488,8 @@ static void __exit nfcsim_exit(void)
nfcsim_link_free(link0);
nfcsim_link_free(link1);
+
+ nfcsim_debugfs_remove();
}
module_init(nfcsim_init);