libertas: Added support for host sleep feature

Existing "ethtool -s ethX wol X" command configures hostsleep
parameters, but those are activated only during suspend/resume,
there is no way to configure host sleep without actual suspend.

This patch adds debugfs command to enable/disable host sleep based on
already configured host sleep parameters using wol command.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kiran Divekar <dkiran@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 66 insertions, 0 deletions

diff --git a/drivers/net/wireless/libertas/debugfs.c b/drivers/net/wireless/libertas/debugfs.c
index 17367463c855..acaf81164624 100644
--- a/drivers/net/wireless/libertas/debugfs.c
+++ b/drivers/net/wireless/libertas/debugfs.c
@@ -124,6 +124,70 @@ out_unlock:
 	return ret;
 }
 
+static ssize_t lbs_host_sleep_write(struct file *file,
+				const char __user *user_buf, size_t count,
+				loff_t *ppos)
+{
+	struct lbs_private *priv = file->private_data;
+	ssize_t buf_size, ret;
+	int host_sleep;
+	unsigned long addr = get_zeroed_page(GFP_KERNEL);
+	char *buf = (char *)addr;
+	if (!buf)
+		return -ENOMEM;
+
+	buf_size = min(count, len - 1);
+	if (copy_from_user(buf, user_buf, buf_size)) {
+		ret = -EFAULT;
+		goto out_unlock;
+	}
+	ret = sscanf(buf, "%d", &host_sleep);
+	if (ret != 1) {
+		ret = -EINVAL;
+		goto out_unlock;
+	}
+
+	if (host_sleep == 0)
+		ret = lbs_set_host_sleep(priv, 0);
+	else if (host_sleep == 1) {
+		if (priv->wol_criteria == EHS_REMOVE_WAKEUP) {
+			lbs_pr_info("wake parameters not configured");
+			ret = -EINVAL;
+			goto out_unlock;
+		}
+		ret = lbs_set_host_sleep(priv, 1);
+	} else {
+		lbs_pr_err("invalid option\n");
+		ret = -EINVAL;
+	}
+
+	if (!ret)
+		ret = count;
+
+out_unlock:
+	free_page(addr);
+	return ret;
+}
+
+static ssize_t lbs_host_sleep_read(struct file *file, char __user *userbuf,
+				  size_t count, loff_t *ppos)
+{
+	struct lbs_private *priv = file->private_data;
+	ssize_t ret;
+	size_t pos = 0;
+	unsigned long addr = get_zeroed_page(GFP_KERNEL);
+	char *buf = (char *)addr;
+	if (!buf)
+		return -ENOMEM;
+
+	pos += snprintf(buf, len, "%d\n", priv->is_host_sleep_activated);
+
+	ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
+
+	free_page(addr);
+	return ret;
+}
+
 /*
  * When calling CMD_802_11_SUBSCRIBE_EVENT with CMD_ACT_GET, me might
  * get a bunch of vendor-specific TLVs (a.k.a. IEs) back from the
@@ -675,6 +739,8 @@ static const struct lbs_debugfs_files debugfs_files[] = {
 	{ "info", 0444, FOPS(lbs_dev_info, write_file_dummy), },
 	{ "sleepparams", 0644, FOPS(lbs_sleepparams_read,
 				lbs_sleepparams_write), },
+	{ "hostsleep", 0644, FOPS(lbs_host_sleep_read,
+				lbs_host_sleep_write), },
 };
 
 static const struct lbs_debugfs_files debugfs_events_files[] = {