V4L/DVB (12552): FM TX: si4713: Add files to handle si4713 i2c device

This patch adds files to control si4713 devices.
Internal functions to control device properties
and initialization procedures are into these files.
Also, a v4l2 subdev interface is also exported.
This way other drivers can use this as v4l2 i2c subdevice.

Signed-off-by: Eduardo Valentin <eduardo.valentin@nokia.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

include/media/si4713.h

@@ -0,0 +1,49 @@
+/*
+ * include/media/si4713.h
+ *
+ * Board related data definitions for Si4713 i2c device driver.
+ *
+ * Copyright (c) 2009 Nokia Corporation
+ * Contact: Eduardo Valentin <eduardo.valentin@nokia.com>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ *
+ */
+
+#ifndef SI4713_H
+#define SI4713_H
+
+/* The SI4713 I2C sensor chip has a fixed slave address of 0xc6 or 0x22. */
+#define SI4713_I2C_ADDR_BUSEN_HIGH	0x63
+#define SI4713_I2C_ADDR_BUSEN_LOW	0x11
+
+/*
+ * Platform dependent definition
+ */
+struct si4713_platform_data {
+	/* Set power state, zero is off, non-zero is on. */
+	int (*set_power)(int power);
+};
+
+/*
+ * Structure to query for Received Noise Level (RNL).
+ */
+struct si4713_rnl {
+	__u32 index;		/* modulator index */
+	__u32 frequency;	/* frequency to peform rnl measurement */
+	__s32 rnl;		/* result of measurement in dBuV */
+	__u32 reserved[4];	/* drivers and apps must init this to 0 */
+};
+
+/*
+ * This is the ioctl number to query for rnl. Users must pass a
+ * struct si4713_rnl pointer specifying desired frequency in 'frequency' field
+ * following driver capabilities (i.e V4L2_TUNER_CAP_LOW).
+ * Driver must return measured value in the same struture, filling 'rnl' field.
+ */
+#define SI4713_IOC_MEASURE_RNL	_IOWR('V', BASE_VIDIOC_PRIVATE + 0, \
+						struct si4713_rnl)
+
+#endif /* ifndef SI4713_H*/