brcmfmac: add "reset" debugfs entry for testing reset

This is a trivial debugfs entry for triggering reset just like in case
of firmware crash. It works by writing 1 to it:
echo 1 > reset

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
index 705b8cc53c3e2d671b5a1b372238077e94a7795e..21e07d1ceeae5ceb5708510e877983fbd0bd86b5 100644 (file)
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
@@ -1086,6 +1086,29 @@ static void brcmf_core_bus_reset(struct work_struct *work)
        brcmf_bus_reset(drvr->bus_if);
 }
 
+static ssize_t bus_reset_write(struct file *file, const char __user *user_buf,
+                              size_t count, loff_t *ppos)
+{
+       struct brcmf_pub *drvr = file->private_data;
+       u8 value;
+
+       if (kstrtou8_from_user(user_buf, count, 0, &value))
+               return -EINVAL;
+
+       if (value != 1)
+               return -EINVAL;
+
+       schedule_work(&drvr->bus_reset);
+
+       return count;
+}
+
+static const struct file_operations bus_reset_fops = {
+       .open   = simple_open,
+       .llseek = no_llseek,
+       .write  = bus_reset_write,
+};
+
 static int brcmf_bus_started(struct brcmf_pub *drvr, struct cfg80211_ops *ops)
 {
        int ret = -1;
@@ -1161,6 +1184,8 @@ static int brcmf_bus_started(struct brcmf_pub *drvr, struct cfg80211_ops *ops)
 
        /* populate debugfs */
        brcmf_debugfs_add_entry(drvr, "revinfo", brcmf_revinfo_read);
+       debugfs_create_file("reset", 0600, brcmf_debugfs_get_devdir(drvr), drvr,
+                           &bus_reset_fops);
        brcmf_feat_debugfs_create(drvr);
        brcmf_proto_debugfs_create(drvr);
        brcmf_bus_debugfs_create(bus_if);