wl12xx: add suspend_listen_interval debugfs file

Add read/write to suspend_dtim_interval file which
controls the number of DTIM periods between wakeups
while the host is suspended.
The value while the host is resumed is controlled
by the file dtim_interval which existed previously.
Signed-off-by: NEyal Shapira <eyal@wizery.com>
Signed-off-by: NEliad Peller <eliad@wizery.com>
Signed-off-by: NLuciano Coelho <coelho@ti.com>

drivers/net/wireless/wl12xx/debugfs.c

@@ -625,6 +625,64 @@ static const struct file_operations dtim_interval_ops = {
 	.llseek = default_llseek,
 };
 
+
+
+static ssize_t suspend_dtim_interval_read(struct file *file,
+					  char __user *user_buf,
+					  size_t count, loff_t *ppos)
+{
+	struct wl1271 *wl = file->private_data;
+	u8 value;
+
+	if (wl->conf.conn.suspend_wake_up_event == CONF_WAKE_UP_EVENT_DTIM ||
+	    wl->conf.conn.suspend_wake_up_event == CONF_WAKE_UP_EVENT_N_DTIM)
+		value = wl->conf.conn.suspend_listen_interval;
+	else
+		value = 0;
+
+	return wl1271_format_buffer(user_buf, count, ppos, "%d\n", value);
+}
+
+static ssize_t suspend_dtim_interval_write(struct file *file,
+					   const char __user *user_buf,
+					   size_t count, loff_t *ppos)
+{
+	struct wl1271 *wl = file->private_data;
+	unsigned long value;
+	int ret;
+
+	ret = kstrtoul_from_user(user_buf, count, 10, &value);
+	if (ret < 0) {
+		wl1271_warning("illegal value for suspend_dtim_interval");
+		return -EINVAL;
+	}
+
+	if (value < 1 || value > 10) {
+		wl1271_warning("suspend_dtim value is not in valid range");
+		return -ERANGE;
+	}
+
+	mutex_lock(&wl->mutex);
+
+	wl->conf.conn.suspend_listen_interval = value;
+	/* for some reason there are different event types for 1 and >1 */
+	if (value == 1)
+		wl->conf.conn.suspend_wake_up_event = CONF_WAKE_UP_EVENT_DTIM;
+	else
+		wl->conf.conn.suspend_wake_up_event = CONF_WAKE_UP_EVENT_N_DTIM;
+
+	mutex_unlock(&wl->mutex);
+	return count;
+}
+
+
+static const struct file_operations suspend_dtim_interval_ops = {
+	.read = suspend_dtim_interval_read,
+	.write = suspend_dtim_interval_write,
+	.open = wl1271_open_file_generic,
+	.llseek = default_llseek,
+};
+
 static ssize_t beacon_interval_read(struct file *file, char __user *user_buf,
 				    size_t count, loff_t *ppos)
 {
@@ -949,6 +1007,7 @@ static int wl1271_debugfs_add_files(struct wl1271 *wl,
 	DEBUGFS_ADD(driver_state, rootdir);
 	DEBUGFS_ADD(vifs_state, rootdir);
 	DEBUGFS_ADD(dtim_interval, rootdir);
+	DEBUGFS_ADD(suspend_dtim_interval, rootdir);
 	DEBUGFS_ADD(beacon_interval, rootdir);
 	DEBUGFS_ADD(beacon_filtering, rootdir);
 	DEBUGFS_ADD(dynamic_ps_timeout, rootdir);