ath9k: Add a debugfs file for WOW

This can be used to force WOW for cards that
are not present in the supported PCI ID list.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

3 files changed, 71 insertions, 2 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 803a7d4ff1b2..20216c56e158 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -1044,6 +1044,7 @@ struct ath_softc {
 
 #ifdef CONFIG_ATH9K_WOW
         u32 wow_intr_before_sleep;
+        bool force_wow;
 #endif
 };
 
diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index dd5d3914799b..50a2e0ac3b8b 100644
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -1043,6 +1043,69 @@ static const struct file_operations fops_ackto = {
 };
 #endif
 
+#ifdef CONFIG_ATH9K_WOW
+
+static ssize_t read_file_wow(struct file *file, char __user *user_buf,
+                             size_t count, loff_t *ppos)
+{
+        struct ath_softc *sc = file->private_data;
+        unsigned int len = 0, size = 32;
+        ssize_t retval;
+        char *buf;
+
+        buf = kzalloc(size, GFP_KERNEL);
+        if (!buf)
+                return -ENOMEM;
+
+        len += scnprintf(buf + len, size - len, "WOW: %s\n",
+                         sc->force_wow ? "ENABLED" : "DISABLED");
+
+        if (len > size)
+                len = size;
+
+        retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);
+        kfree(buf);
+
+        return retval;
+}
+
+static ssize_t write_file_wow(struct file *file, const char __user *user_buf,
+                              size_t count, loff_t *ppos)
+{
+        struct ath_softc *sc = file->private_data;
+        unsigned long val;
+        char buf[32];
+        ssize_t len;
+
+        len = min(count, sizeof(buf) - 1);
+        if (copy_from_user(buf, user_buf, len))
+                return -EFAULT;
+
+        buf[len] = '\0';
+        if (kstrtoul(buf, 0, &val))
+                return -EINVAL;
+
+        if (val != 1)
+                return -EINVAL;
+
+        if (!sc->force_wow) {
+                sc->force_wow = true;
+                ath9k_init_wow(sc->hw);
+        }
+
+        return count;
+}
+
+static const struct file_operations fops_wow = {
+        .read = read_file_wow,
+        .write = write_file_wow,
+        .open = simple_open,
+        .owner = THIS_MODULE,
+        .llseek = default_llseek,
+};
+
+#endif
+
 static ssize_t read_file_tpc(struct file *file, char __user *user_buf,
                              size_t count, loff_t *ppos)
 {
@@ -1313,6 +1376,11 @@ int ath9k_init_debug(struct ath_hw *ah)
                             &fops_btcoex);
 #endif
 
+#ifdef CONFIG_ATH9K_WOW
+        debugfs_create_file("wow", S_IRUSR | S_IWUSR,
+                            sc->debug.debugfs_phy, sc, &fops_wow);
+#endif
+
 #ifdef CONFIG_ATH9K_DYNACK
         debugfs_create_file("ack_to", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
                             sc, &fops_ackto);
diff --git a/drivers/net/wireless/ath/ath9k/wow.c b/drivers/net/wireless/ath/ath9k/wow.c
index d4cfbc363eb5..4b3b56563714 100644
--- a/drivers/net/wireless/ath/ath9k/wow.c
+++ b/drivers/net/wireless/ath/ath9k/wow.c
@@ -327,7 +327,7 @@ void ath9k_init_wow(struct ieee80211_hw *hw)
 {
         struct ath_softc *sc = hw->priv;
 
-        if (sc->driver_data & ATH9K_PCI_WOW) {
+        if ((sc->driver_data & ATH9K_PCI_WOW) || sc->force_wow) {
                 hw->wiphy->wowlan = &ath9k_wowlan_support;
                 device_init_wakeup(sc->dev, 1);
         }
@@ -337,6 +337,6 @@ void ath9k_deinit_wow(struct ieee80211_hw *hw)
 {
         struct ath_softc *sc = hw->priv;
 
-        if (sc->driver_data & ATH9K_PCI_WOW)
+        if ((sc->driver_data & ATH9K_PCI_WOW) || sc->force_wow)
                 device_init_wakeup(sc->dev, 0);
 }