[PATCH 2/3] Bluetooth: debugfs: Add force_suspend entry

[Luiz Augusto von Dentz <luiz.dentz@xxxxxxxxx>]

From: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>

This adds force_suspend which can be used to force the controller into
suspend/resume state.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
---
 net/bluetooth/hci_debugfs.c | 48 +++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/net/bluetooth/hci_debugfs.c b/net/bluetooth/hci_debugfs.c
index 902b40a90b91..53b39cc73cd7 100644
--- a/net/bluetooth/hci_debugfs.c
+++ b/net/bluetooth/hci_debugfs.c
@@ -305,6 +305,51 @@ static const struct file_operations sc_only_mode_fops = {
 	.llseek		= default_llseek,
 };
 
+static ssize_t force_suspend_read(struct file *file, char __user *user_buf,
+				  size_t count, loff_t *ppos)
+{
+	struct hci_dev *hdev = file->private_data;
+	char buf[3];
+
+	buf[0] = hdev->suspended ? 'Y' : 'N';
+	buf[1] = '\n';
+	buf[2] = '\0';
+	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
+}
+
+static ssize_t force_suspend_write(struct file *file,
+				   const char __user *user_buf,
+				   size_t count, loff_t *ppos)
+{
+	struct hci_dev *hdev = file->private_data;
+	bool enable;
+	int err;
+
+	err = kstrtobool_from_user(user_buf, count, &enable);
+	if (err)
+		return err;
+
+	if (hdev->suspended == enable)
+		return -EALREADY;
+
+	if (enable)
+		err = hci_suspend_dev(hdev);
+	else
+		err = hci_resume_dev(hdev);
+
+	if (err)
+		return err;
+
+	return count;
+}
+
+static const struct file_operations force_suspend_fops = {
+	.open		= simple_open,
+	.read		= force_suspend_read,
+	.write		= force_suspend_write,
+	.llseek		= default_llseek,
+};
+
 DEFINE_INFO_ATTRIBUTE(hardware_info, hw_info);
 DEFINE_INFO_ATTRIBUTE(firmware_info, fw_info);
 
@@ -336,6 +381,9 @@ void hci_debugfs_create_common(struct hci_dev *hdev)
 	debugfs_create_file("conn_info_max_age", 0644, hdev->debugfs, hdev,
 			    &conn_info_max_age_fops);
 
+	debugfs_create_file("force_suspend", 0644, hdev->debugfs, hdev,
+			    &force_suspend_fops);
+
 	if (lmp_ssp_capable(hdev) || lmp_le_capable(hdev))
 		debugfs_create_file("use_debug_keys", 0444, hdev->debugfs,
 				    hdev, &use_debug_keys_fops);
-- 
2.31.1