HID: intel-ish-hid: Add interface function for PCI device pointer

Instead of directly accessing PCI device poitner via struct ishtp_cl,
create interface function for same. This is required for DMA transfer.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/intel-ish-hid/ishtp/bus.c

@@ -855,6 +855,19 @@ struct device *ishtp_device(struct ishtp_cl_device *device)
 }
 EXPORT_SYMBOL(ishtp_device);
 
+/**
+ * ishtp_get_pci_device() - Return PCI device dev pointer
+ * This interface is used to return PCI device pointer
+ * from ishtp_cl_device instance.
+ *
+ * Return: device *.
+ */
+struct device *ishtp_get_pci_device(struct ishtp_cl_device *device)
+{
+	return device->ishtp_dev->devc;
+}
+EXPORT_SYMBOL(ishtp_get_pci_device);
+
 /**
  * ishtp_trace_callback() - Return trace callback
  *

include/linux/intel-ish-client-if.h

@@ -77,6 +77,8 @@ int ishtp_register_event_cb(struct ishtp_cl_device *device,
 struct device *ishtp_device(struct ishtp_cl_device *cl_device);
 /* Trace interface for clients */
 void *ishtp_trace_callback(struct ishtp_cl_device *cl_device);
+/* Get device pointer of PCI device for DMA acces */
+struct device *ishtp_get_pci_device(struct ishtp_cl_device *cl_device);
 
 struct ishtp_cl *ishtp_cl_allocate(struct ishtp_cl_device *cl_device);
 void ishtp_cl_free(struct ishtp_cl *cl);