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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>
hifive-unleashed-5.1
Thierry Escande 2016-07-19 11:58:16 +02:00 committed by Samuel Ortiz
parent d85a301c26
commit f9ac6273e5
1 changed files with 51 additions and 0 deletions
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51
drivers/nfc/nfcsim.c
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@ -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);