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author | Thierry Escande <thierry.escande@collabora.com> | 2016-07-19 11:58:16 +0200 |
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committer | Samuel Ortiz <sameo@linux.intel.com> | 2016-07-19 23:23:29 +0200 |
commit | f9ac6273e5b8fa45e7cd2086e1bbc91af9af7f19 (patch) | |
tree | dd87d826858e81638aabe14bbb5b0c5a24afeb8a /drivers/nfc | |
parent | d85a301c26621d3466956dc477c32c20c15a52ee (diff) | |
download | lwn-f9ac6273e5b8fa45e7cd2086e1bbc91af9af7f19.tar.gz lwn-f9ac6273e5b8fa45e7cd2086e1bbc91af9af7f19.zip |
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>
Diffstat (limited to 'drivers/nfc')
-rw-r--r-- | drivers/nfc/nfcsim.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/nfc/nfcsim.c b/drivers/nfc/nfcsim.c index 40b4846509f4..97067a5f248c 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); |