V4L/DVB (10534): Output HW/SW version from scratchpad

This patch adds functions to access the scratchpad.
For it is this good for? In the first two bytes, the developers
stored the HW/PCB version and the software release of the firmware.
This is now written to syslog, so debugging get's easier.
Also knowing the versions is the key for flash upgrades later on.

There are also some cleanups of the flash report sizes.

Altogether this should justify the new version number 1.0.9.

Thanks to Rick Bronson <rick@efn.org>

Signed-off-by: Tobias Lorenz <tobias.lorenz@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/radio/radio-si470x.c

@@ -105,6 +105,7 @@
  * 2009-01-31	Rick Bronson <rick@efn.org>
  *		Tobias Lorenz <tobias.lorenz@gmx.net>
  *		- add LED status output
+ *		- get HW/SW version from scratchpad
  *
  * ToDo:
  * - add firmware download/update support
@@ -115,10 +116,10 @@
 /* driver definitions */
 #define DRIVER_AUTHOR "Tobias Lorenz <tobias.lorenz@gmx.net>"
 #define DRIVER_NAME "radio-si470x"
-#define DRIVER_KERNEL_VERSION KERNEL_VERSION(1, 0, 8)
+#define DRIVER_KERNEL_VERSION KERNEL_VERSION(1, 0, 9)
 #define DRIVER_CARD "Silicon Labs Si470x FM Radio Receiver"
 #define DRIVER_DESC "USB radio driver for Si470x FM Radio Receivers"
-#define DRIVER_VERSION "1.0.8"
+#define DRIVER_VERSION "1.0.9"
 
 
 /* kernel includes */
@@ -354,9 +355,13 @@ MODULE_PARM_DESC(rds_poll_time, "RDS poll time (ms): *40*");
 #define SCRATCH_REPORT		20
 
 /* Reports 19-22: flash upgrade of the C8051F321 */
+#define WRITE_REPORT_SIZE	4
 #define WRITE_REPORT		19
+#define FLASH_REPORT_SIZE	64
 #define FLASH_REPORT		20
+#define CRC_REPORT_SIZE		3
 #define CRC_REPORT		21
+#define RESPONSE_REPORT_SIZE	2
 #define RESPONSE_REPORT		22
 
 /* Report 23: currently unused, but can accept 60 byte reports on the HID */
@@ -429,12 +434,6 @@ MODULE_PARM_DESC(rds_poll_time, "RDS poll time (ms): *40*");
 #define COMMAND_FAILED		0x02
 #define COMMAND_PENDING		0x03
 
-/* buffer sizes */
-#define COMMAND_BUFFER_SIZE	4
-#define RESPONSE_BUFFER_SIZE	2
-#define FLASH_BUFFER_SIZE	64
-#define CRC_BUFFER_SIZE		3
-
 
 
 /**************************************************************************
@@ -466,6 +465,10 @@ struct si470x_device {
 	unsigned int buf_size;
 	unsigned int rd_index;
 	unsigned int wr_index;
+
+	/* scratch page */
+	unsigned char software_version;
+	unsigned char hardware_version;
 };
 
 
@@ -833,30 +836,6 @@ static int si470x_rds_on(struct si470x_device *radio)
 
 
 
-/**************************************************************************
- * General Driver Functions - LED_REPORT
- **************************************************************************/
-
-/*
- * si470x_set_led_state - sets the led state
- */
-static int si470x_set_led_state(struct si470x_device *radio,
-		unsigned char led_state)
-{
-	unsigned char buf[LED_REPORT_SIZE];
-	int retval;
-
-	buf[0] = LED_REPORT;
-	buf[1] = LED_COMMAND;
-	buf[2] = led_state;
-
-	retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
-
-	return (retval < 0) ? -EINVAL : 0;
-}
-
-
-
 /**************************************************************************
  * General Driver Functions - ENTIRE_REPORT
  **************************************************************************/
@@ -921,6 +900,59 @@ static int si470x_get_rds_registers(struct si470x_device *radio)
 
 
 
+/**************************************************************************
+ * General Driver Functions - LED_REPORT
+ **************************************************************************/
+
+/*
+ * si470x_set_led_state - sets the led state
+ */
+static int si470x_set_led_state(struct si470x_device *radio,
+		unsigned char led_state)
+{
+	unsigned char buf[LED_REPORT_SIZE];
+	int retval;
+
+	buf[0] = LED_REPORT;
+	buf[1] = LED_COMMAND;
+	buf[2] = led_state;
+
+	retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
+
+	return (retval < 0) ? -EINVAL : 0;
+}
+
+
+
+/**************************************************************************
+ * General Driver Functions - SCRATCH_REPORT
+ **************************************************************************/
+
+/*
+ * si470x_get_scratch_versions - gets the scratch page and version infos
+ */
+static int si470x_get_scratch_page_versions(struct si470x_device *radio)
+{
+	unsigned char buf[SCRATCH_REPORT_SIZE];
+	int retval;
+
+	buf[0] = SCRATCH_REPORT;
+
+	retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
+
+	if (retval < 0)
+		printk(KERN_WARNING DRIVER_NAME ": si470x_get_scratch: "
+			"si470x_get_report returned %d\n", retval);
+	else {
+		radio->software_version = buf[1];
+		radio->hardware_version = buf[2];
+	}
+
+	return (retval < 0) ? -EINVAL : 0;
+}
+
+
+
 /**************************************************************************
  * RDS Driver Functions
  **************************************************************************/
@@ -1651,15 +1683,24 @@ static int si470x_usb_driver_probe(struct usb_interface *intf,
 			sizeof(si470x_viddev_template));
 	video_set_drvdata(radio->videodev, radio);
 
-	/* show some infos about the specific device */
+	/* show some infos about the specific si470x device */
 	if (si470x_get_all_registers(radio) < 0) {
 		retval = -EIO;
 		goto err_all;
 	}
 	printk(KERN_INFO DRIVER_NAME ": DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
 			radio->registers[DEVICEID], radio->registers[CHIPID]);
 
-	/* check if firmware is current */
+	/* get software and hardware versions */
+	if (si470x_get_scratch_page_versions(radio) < 0) {
+		retval = -EIO;
+		goto err_all;
+	}
+	printk(KERN_INFO DRIVER_NAME
+			": software version %d, hardware version %d\n",
+			radio->software_version, radio->hardware_version);
+
+	/* check if device and firmware is current */
 	if ((radio->registers[CHIPID] & CHIPID_FIRMWARE)
 			< RADIO_SW_VERSION_CURRENT) {
 		printk(KERN_WARNING DRIVER_NAME