[media] ngene: Shutdown workaround

Implement shutdown workaround for some chipsets.
Signed-off-by: Ralph Metzler <rjkm@metzlerbros.de>
Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/ngene/ngene-cards.c

@@ -436,6 +436,7 @@ static struct pci_driver ngene_pci_driver = {
 	.probe       = ngene_probe,
 	.remove      = __devexit_p(ngene_remove),
 	.err_handler = &ngene_errors,
+	.shutdown    = ngene_shutdown,
 };
 
 static __init int module_init_ngene(void)

drivers/media/dvb/ngene/ngene-core.c

@@ -45,6 +45,10 @@ static int one_adapter = 1;
 module_param(one_adapter, int, 0444);
 MODULE_PARM_DESC(one_adapter, "Use only one adapter.");
 
+static int shutdown_workaround;
+module_param(shutdown_workaround, int, 0644);
+MODULE_PARM_DESC(one_adapter, "Activate workaround for shutdown problem with some chipsets.");
+
 static int debug;
 module_param(debug, int, 0444);
 MODULE_PARM_DESC(debug, "Print debugging information.");
@@ -1574,6 +1578,39 @@ static void cxd_detach(struct ngene *dev)
 	ci->en = 0;
 }
 
+/***********************************/
+/* workaround for shutdown failure */
+/***********************************/
+
+static void ngene_unlink(struct ngene *dev)
+{
+	struct ngene_command com;
+
+	com.cmd.hdr.Opcode = CMD_MEM_WRITE;
+	com.cmd.hdr.Length = 3;
+	com.cmd.MemoryWrite.address = 0x910c;
+	com.cmd.MemoryWrite.data = 0xff;
+	com.in_len = 3;
+	com.out_len = 1;
+
+	down(&dev->cmd_mutex);
+	ngwritel(0, NGENE_INT_ENABLE);
+	ngene_command_mutex(dev, &com);
+	up(&dev->cmd_mutex);
+}
+
+void ngene_shutdown(struct pci_dev *pdev)
+{
+	struct ngene *dev = (struct ngene *)pci_get_drvdata(pdev);
+
+	if (!dev || !shutdown_workaround)
+		return;
+
+	printk(KERN_INFO DEVICE_NAME ": shutdown workaround...\n");
+	ngene_unlink(dev);
+	pci_disable_device(pdev);
+}
+
 /****************************************************************************/
 /* device probe/remove calls ************************************************/
 /****************************************************************************/

drivers/media/dvb/ngene/ngene.h

@@ -881,6 +881,7 @@ struct ngene_buffer {
 int __devinit ngene_probe(struct pci_dev *pci_dev,
 			  const struct pci_device_id *id);
 void __devexit ngene_remove(struct pci_dev *pdev);
+void ngene_shutdown(struct pci_dev *pdev);
 int ngene_command(struct ngene *dev, struct ngene_command *com);
 int ngene_command_gpio_set(struct ngene *dev, u8 select, u8 level);
 void set_transfer(struct ngene_channel *chan, int state);