V4L/DVB (7003): cx23885: Add support for device revision detection

Each version of the cx23885/7/8 silicon has different build revs.
We'll use this internal revision to work around bugs and known
issues in the video and encoder related patches.
Signed-off-by: Steven Toth <stoth@hauppauge.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/cx23885/cx23885-core.c

@@ -702,6 +702,44 @@ static int cx23885_init_tsport(struct cx23885_dev *dev, struct cx23885_tsport *p
 	return 0;
 }
 
+static void cx23885_dev_checkrevision(struct cx23885_dev *dev)
+{
+	switch (cx_read(RDR_CFG2) & 0xff) {
+	case 0x00:
+		/* cx23885 */
+		dev->hwrevision = 0xa0;
+		break;
+	case 0x01:
+		/* CX23885-12Z */
+		dev->hwrevision = 0xa1;
+		break;
+	case 0x02:
+		/* CX23885-13Z */
+		dev->hwrevision = 0xb0;
+		break;
+	case 0x03:
+		/* CX23888-22Z */
+		dev->hwrevision = 0xc0;
+		break;
+	case 0x0e:
+		/* CX23887-15Z */
+		dev->hwrevision = 0xc0;
+	case 0x0f:
+		/* CX23887-14Z */
+		dev->hwrevision = 0xb1;
+		break;
+	default:
+		printk(KERN_ERR "%s() New hardware revision found 0x%x\n",
+			__FUNCTION__, dev->hwrevision);
+	}
+	if (dev->hwrevision)
+		printk(KERN_INFO "%s() Hardware revision = 0x%02x\n",
+			__FUNCTION__, dev->hwrevision);
+	else
+		printk(KERN_ERR "%s() Hardware revision unknown 0x%x\n",
+			__FUNCTION__, dev->hwrevision);
+}
+
 static int cx23885_dev_setup(struct cx23885_dev *dev)
 {
 	int i;
@@ -832,6 +870,8 @@ static int cx23885_dev_setup(struct cx23885_dev *dev)
 		}
 	}
 
+	cx23885_dev_checkrevision(dev);
+
 	return 0;
 }
 

drivers/media/video/cx23885/cx23885-reg.h

@@ -276,6 +276,7 @@ Channel manager Data Structure entry = 20 DWORD
 
 #define RDR_CFG0	0x00050000
 #define RDR_CFG1	0x00050004
+#define RDR_CFG2	0x00050008
 #define RDR_TLCTL0	0x00050318
 
 /* APB DMAC Current Buffer Pointer */

drivers/media/video/cx23885/cx23885.h

@@ -191,6 +191,7 @@ struct cx23885_dev {
 	u32                        __iomem *lmmio;
 	u8                         __iomem *bmmio;
 	int                        pci_irqmask;
+	int                        hwrevision;
 
 	/* I2C adapters: Master 1 & 2 (External) & Master 3 (Internal only) */
 	struct cx23885_i2c         i2c_bus[3];