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Commit f9ac6273 authored by Thierry Escande's avatar Thierry Escande Committed by Samuel Ortiz
Browse files

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: default avatarThierry Escande <thierry.escande@collabora.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent d85a301c

drivers/nfc/nfcsim.c

+51 −0
Original line number Diff line number Diff line
@@ -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);