brcmfmac: expose chip information through debugfs

Adding the debugfs file <debugfs_mnt>/brcmfmac/<devid>/chipinfo
which contains the chip number and revision.

Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 35 insertions, 1 deletions

diff --git a/drivers/net/wireless/brcm80211/brcmfmac/dhd_dbg.c b/drivers/net/wireless/brcm80211/brcmfmac/dhd_dbg.c
index 0f9e9057e7dd..03fe8aca4d32 100644
--- a/drivers/net/wireless/brcm80211/brcmfmac/dhd_dbg.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/dhd_dbg.c
@@ -22,7 +22,6 @@
 #include "dhd.h"
 #include "dhd_bus.h"
 #include "dhd_dbg.h"
-#include "tracepoint.h"
 
 static struct dentry *root_folder;
 
@@ -42,6 +41,40 @@ void brcmf_debugfs_exit(void)
         root_folder = NULL;
 }
 
+static
+ssize_t brcmf_debugfs_chipinfo_read(struct file *f, char __user *data,
+                                   size_t count, loff_t *ppos)
+{
+        struct brcmf_pub *drvr = f->private_data;
+        struct brcmf_bus *bus = drvr->bus_if;
+        char buf[40];
+        int res;
+
+        /* only allow read from start */
+        if (*ppos > 0)
+                return 0;
+
+        res = scnprintf(buf, sizeof(buf), "chip: %x(%u) rev %u\n",
+                        bus->chip, bus->chip, bus->chiprev);
+        return simple_read_from_buffer(data, count, ppos, buf, res);
+}
+
+static const struct file_operations brcmf_debugfs_chipinfo_ops = {
+        .owner = THIS_MODULE,
+        .open = simple_open,
+        .read = brcmf_debugfs_chipinfo_read
+};
+
+static int brcmf_debugfs_create_chipinfo(struct brcmf_pub *drvr)
+{
+        struct dentry *dentry =  drvr->dbgfs_dir;
+
+        if (!IS_ERR_OR_NULL(dentry))
+                debugfs_create_file("chipinfo", S_IRUGO, dentry, drvr,
+                                    &brcmf_debugfs_chipinfo_ops);
+        return 0;
+}
+
 int brcmf_debugfs_attach(struct brcmf_pub *drvr)
 {
         struct device *dev = drvr->bus_if->dev;
@@ -50,6 +83,7 @@ int brcmf_debugfs_attach(struct brcmf_pub *drvr)
                 return -ENODEV;
 
         drvr->dbgfs_dir = debugfs_create_dir(dev_name(dev), root_folder);
+        brcmf_debugfs_create_chipinfo(drvr);
         return PTR_ERR_OR_ZERO(drvr->dbgfs_dir);
 }