[media] rtl2832_sdr: convert to platform driver

That SDR driver module was abusing DVB frontend SEC (satellite
equipment controller) device and due to that it was also using
legacy DVB binding. Platform bus is pseudo-bus provided by kernel
driver model and it fits cases like that, where any other busses
are not suitable.
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-frontends/rtl2832_sdr.h

@@ -32,23 +32,47 @@
 #define RTL2832_SDR_H
 
 #include <linux/kconfig.h>
+#include <linux/i2c.h>
 #include <media/v4l2-subdev.h>
-
-/* for config struct */
+#include "dvb_frontend.h"
 #include "rtl2832.h"
 
-#if IS_ENABLED(CONFIG_DVB_RTL2832_SDR)
-extern struct dvb_frontend *rtl2832_sdr_attach(struct dvb_frontend *fe,
-	struct i2c_adapter *i2c, const struct rtl2832_config *cfg,
-	struct v4l2_subdev *sd);
-#else
+struct rtl2832_sdr_platform_data {
+	/*
+	 * Clock frequency.
+	 * Hz
+	 * 4000000, 16000000, 25000000, 28800000
+	 */
+	u32 clk;
+
+	/*
+	 * Tuner.
+	 * XXX: This list must be kept sync with dvb_usb_rtl28xxu USB IF driver.
+	 */
+#define RTL2832_SDR_TUNER_TUA9001   0x24
+#define RTL2832_SDR_TUNER_FC0012    0x26
+#define RTL2832_SDR_TUNER_E4000     0x27
+#define RTL2832_SDR_TUNER_FC0013    0x29
+#define RTL2832_SDR_TUNER_R820T     0x2a
+#define RTL2832_SDR_TUNER_R828D     0x2b
+	u8 tuner;
+
+	struct i2c_client *i2c_client;
+	int (*bulk_read)(struct i2c_client *, unsigned int, void *, size_t);
+	int (*bulk_write)(struct i2c_client *, unsigned int, const void *, size_t);
+	int (*update_bits)(struct i2c_client *, unsigned int, unsigned int, unsigned int);
+	struct dvb_frontend *dvb_frontend;
+	struct v4l2_subdev *v4l2_subdev;
+	struct dvb_usb_device *dvb_usb_device;
+};
+
+
 static inline struct dvb_frontend *rtl2832_sdr_attach(struct dvb_frontend *fe,
 	struct i2c_adapter *i2c, const struct rtl2832_config *cfg,
 	struct v4l2_subdev *sd)
 {
-	dev_warn(&i2c->dev, "%s: driver disabled by Kconfig\n", __func__);
+	dev_warn(&i2c->dev, "%s: driver disabled!\n", __func__);
 	return NULL;
 }
-#endif
 
 #endif /* RTL2832_SDR_H */