Disable the HID interface when the hardware is shutting down.

src/context.h

@@ -40,7 +40,9 @@ struct ipts_context {
 	struct ipts_buffer feature_report;
 	struct ipts_buffer descriptor;
 
+	bool hid_active;
 	struct hid_device *hid;
+
 	struct ipts_device_info info;
 	struct ipts_resources resources;
 

src/control.c

@@ -412,6 +412,8 @@ int ipts_control_start(struct ipts_context *ipts)
 		return ret;
 	}
 
+	ipts_hid_enable(ipts);
+
 	ret = ipts_hid_init(ipts, info);
 	if (ret) {
 		dev_err(ipts->dev, "Failed to initialize HID device: %d\n", ret);
@@ -428,6 +430,7 @@ static int _ipts_control_stop(struct ipts_context *ipts)
 	if (!ipts)
 		return -EFAULT;
 
+	ipts_hid_disable(ipts);
 	dev_info(ipts->dev, "Stopping IPTS\n");
 
 	ret = ipts_receiver_stop(ipts);

src/hid.c

@@ -21,6 +21,16 @@
 #include "spec-data.h"
 #include "spec-hid.h"
 
+void ipts_hid_enable(struct ipts_context *ipts)
+{
+	WRITE_ONCE(ipts->hid_active, true);
+}
+
+void ipts_hid_disable(struct ipts_context *ipts)
+{
+	WRITE_ONCE(ipts->hid_active, false);
+}
+
 static int ipts_hid_start(struct hid_device *hid)
 {
 	return 0;
@@ -46,6 +56,9 @@ static int ipts_hid_parse(struct hid_device *hid)
 	if (!ipts)
 		return -EFAULT;
 
+	if (!READ_ONCE(ipts->hid_active))
+		return -ENODEV;
+
 	if (ipts->info.intf_eds == 1)
 		ret = ipts_eds1_get_descriptor(ipts, &buffer, &size);
 	else
@@ -80,6 +93,9 @@ static int ipts_hid_raw_request(struct hid_device *hid, unsigned char report_id,
 	if (!ipts)
 		return -EFAULT;
 
+	if (!READ_ONCE(ipts->hid_active))
+		return -ENODEV;
+
 	if (ipts->info.intf_eds == 1) {
 		return ipts_eds1_raw_request(ipts, buffer, size, report_id, report_type,
 					     request_type);
@@ -110,6 +126,9 @@ int ipts_hid_input_data(struct ipts_context *ipts, u32 buffer)
 	if (!ipts->hid)
 		return -ENODEV;
 
+	if (!READ_ONCE(ipts->hid_active))
+		return -ENODEV;
+
 	header = (struct ipts_data_header *)ipts->resources.data[buffer].address;
 
 	temp = ipts->resources.report.address;

src/hid.h

@@ -13,6 +13,9 @@
 #include "context.h"
 #include "spec-device.h"
 
+void ipts_hid_enable(struct ipts_context *ipts);
+void ipts_hid_disable(struct ipts_context *ipts);
+
 int ipts_hid_input_data(struct ipts_context *ipts, u32 buffer);
 
 int ipts_hid_init(struct ipts_context *ipts, struct ipts_device_info info);