media: si470x: allow build both USB and I2C at the same time

Currently, either USB or I2C is built. Change it to allow
having both enabled at the same time.

The main reason is that COMPILE_TEST all[yes/mod]builds will
now contain all drivers under drivers/media.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/radio/Kconfig

@@ -15,10 +15,6 @@ if RADIO_ADAPTERS && VIDEO_V4L2
 config RADIO_TEA575X
 	tristate
 
-config RADIO_SI470X
-	bool "Silicon Labs Si470x FM Radio Receiver support"
-	depends on VIDEO_V4L2
-
 source "drivers/media/radio/si470x/Kconfig"
 
 config RADIO_SI4713

drivers/media/radio/si470x/Kconfig

+config RADIO_SI470X
+        tristate "Silicon Labs Si470x FM Radio Receiver support"
+        depends on VIDEO_V4L2
+	---help---
+	  This is a driver for devices with the Silicon Labs SI470x
+	  chip (either via USB or I2C buses).
+
+	  Say Y here if you want to connect this type of radio to your
+	  computer's USB port or if it is used by some other driver
+	  via I2C bus.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called radio-si470x-common.
+
 config USB_SI470X
 	tristate "Silicon Labs Si470x FM Radio Receiver support with USB"
 	depends on USB && RADIO_SI470X
@@ -25,7 +39,7 @@ config USB_SI470X
 
 config I2C_SI470X
 	tristate "Silicon Labs Si470x FM Radio Receiver support with I2C"
-	depends on I2C && RADIO_SI470X && !USB_SI470X
+	depends on I2C && RADIO_SI470X
 	---help---
 	  This is a driver for I2C devices with the Silicon Labs SI470x
 	  chip.

drivers/media/radio/si470x/Makefile

@@ -2,8 +2,6 @@
 # Makefile for radios with Silicon Labs Si470x FM Radio Receivers
 #
 
-radio-usb-si470x-objs	:= radio-si470x-usb.o radio-si470x-common.o
-radio-i2c-si470x-objs	:= radio-si470x-i2c.o radio-si470x-common.o
-
-obj-$(CONFIG_USB_SI470X) += radio-usb-si470x.o
-obj-$(CONFIG_I2C_SI470X) += radio-i2c-si470x.o
+obj-$(CONFIG_RADIO_SI470X) := radio-si470x-common.o
+obj-$(CONFIG_USB_SI470X) += radio-si470x-usb.o
+obj-$(CONFIG_I2C_SI470X) += radio-si470x-i2c.o

drivers/media/radio/si470x/radio-si470x-common.c

@@ -110,8 +110,6 @@
 /* kernel includes */
 #include "radio-si470x.h"
 
-
-
 /**************************************************************************
  * Module Parameters
  **************************************************************************/
@@ -195,7 +193,7 @@ static int si470x_set_band(struct si470x_device *radio, int band)
 	radio->band = band;
 	radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_BAND;
 	radio->registers[SYSCONFIG2] |= radio->band << 6;
-	return si470x_set_register(radio, SYSCONFIG2);
+	return radio->set_register(radio, SYSCONFIG2);
 }
 
 /*
@@ -207,7 +205,7 @@ static int si470x_set_chan(struct si470x_device *radio, unsigned short chan)
 	unsigned long time_left;
 	bool timed_out = false;
 
-	retval = si470x_get_register(radio, POWERCFG);
+	retval = radio->get_register(radio, POWERCFG);
 	if (retval)
 		return retval;
 
@@ -219,7 +217,7 @@ static int si470x_set_chan(struct si470x_device *radio, unsigned short chan)
 	/* start tuning */
 	radio->registers[CHANNEL] &= ~CHANNEL_CHAN;
 	radio->registers[CHANNEL] |= CHANNEL_TUNE | chan;
-	retval = si470x_set_register(radio, CHANNEL);
+	retval = radio->set_register(radio, CHANNEL);
 	if (retval < 0)
 		goto done;
 
@@ -238,7 +236,7 @@ static int si470x_set_chan(struct si470x_device *radio, unsigned short chan)
 
 	/* stop tuning */
 	radio->registers[CHANNEL] &= ~CHANNEL_TUNE;
-	retval = si470x_set_register(radio, CHANNEL);
+	retval = radio->set_register(radio, CHANNEL);
 
 done:
 	return retval;
@@ -272,7 +270,7 @@ static int si470x_get_freq(struct si470x_device *radio, unsigned int *freq)
 	int chan, retval;
 
 	/* read channel */
-	retval = si470x_get_register(radio, READCHAN);
+	retval = radio->get_register(radio, READCHAN);
 	chan = radio->registers[READCHAN] & READCHAN_READCHAN;
 
 	/* Frequency (MHz) = Spacing (kHz) x Channel + Bottom of Band (MHz) */
@@ -296,6 +294,7 @@ int si470x_set_freq(struct si470x_device *radio, unsigned int freq)
 
 	return si470x_set_chan(radio, chan);
 }
+EXPORT_SYMBOL_GPL(si470x_set_freq);
 
 
 /*
@@ -343,7 +342,7 @@ static int si470x_set_seek(struct si470x_device *radio,
 		radio->registers[POWERCFG] |= POWERCFG_SEEKUP;
 	else
 		radio->registers[POWERCFG] &= ~POWERCFG_SEEKUP;
-	retval = si470x_set_register(radio, POWERCFG);
+	retval = radio->set_register(radio, POWERCFG);
 	if (retval < 0)
 		return retval;
 
@@ -362,7 +361,7 @@ static int si470x_set_seek(struct si470x_device *radio,
 
 	/* stop seeking */
 	radio->registers[POWERCFG] &= ~POWERCFG_SEEK;
-	retval = si470x_set_register(radio, POWERCFG);
+	retval = radio->set_register(radio, POWERCFG);
 
 	/* try again, if timed out */
 	if (retval == 0 && timed_out)
@@ -381,7 +380,7 @@ int si470x_start(struct si470x_device *radio)
 	/* powercfg */
 	radio->registers[POWERCFG] =
 		POWERCFG_DMUTE | POWERCFG_ENABLE | POWERCFG_RDSM;
-	retval = si470x_set_register(radio, POWERCFG);
+	retval = radio->set_register(radio, POWERCFG);
 	if (retval < 0)
 		goto done;
 
@@ -392,7 +391,7 @@ int si470x_start(struct si470x_device *radio)
 	radio->registers[SYSCONFIG1] |= SYSCONFIG1_GPIO2_INT;
 	if (de)
 		radio->registers[SYSCONFIG1] |= SYSCONFIG1_DE;
-	retval = si470x_set_register(radio, SYSCONFIG1);
+	retval = radio->set_register(radio, SYSCONFIG1);
 	if (retval < 0)
 		goto done;
 
@@ -402,7 +401,7 @@ int si470x_start(struct si470x_device *radio)
 		((radio->band << 6) & SYSCONFIG2_BAND) |/* BAND */
 		((space << 4) & SYSCONFIG2_SPACE) |	/* SPACE */
 		15;					/* VOLUME (max) */
-	retval = si470x_set_register(radio, SYSCONFIG2);
+	retval = radio->set_register(radio, SYSCONFIG2);
 	if (retval < 0)
 		goto done;
 
@@ -413,6 +412,7 @@ int si470x_start(struct si470x_device *radio)
 done:
 	return retval;
 }
+EXPORT_SYMBOL_GPL(si470x_start);
 
 
 /*
@@ -424,7 +424,7 @@ int si470x_stop(struct si470x_device *radio)
 
 	/* sysconfig 1 */
 	radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
-	retval = si470x_set_register(radio, SYSCONFIG1);
+	retval = radio->set_register(radio, SYSCONFIG1);
 	if (retval < 0)
 		goto done;
 
@@ -432,11 +432,12 @@ int si470x_stop(struct si470x_device *radio)
 	radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
 	/* POWERCFG_ENABLE has to automatically go low */
 	radio->registers[POWERCFG] |= POWERCFG_ENABLE |	POWERCFG_DISABLE;
-	retval = si470x_set_register(radio, POWERCFG);
+	retval = radio->set_register(radio, POWERCFG);
 
 done:
 	return retval;
 }
+EXPORT_SYMBOL_GPL(si470x_stop);
 
 
 /*
@@ -448,7 +449,7 @@ static int si470x_rds_on(struct si470x_device *radio)
 
 	/* sysconfig 1 */
 	radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDS;
-	retval = si470x_set_register(radio, SYSCONFIG1);
+	retval = radio->set_register(radio, SYSCONFIG1);
 	if (retval < 0)
 		radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
 
@@ -542,6 +543,25 @@ static __poll_t si470x_fops_poll(struct file *file,
 }
 
 
+static int si470x_fops_open(struct file *file)
+{
+	struct si470x_device *radio = video_drvdata(file);
+
+	return radio->fops_open(file);
+}
+
+
+/*
+ * si470x_fops_release - file release
+ */
+static int si470x_fops_release(struct file *file)
+{
+	struct si470x_device *radio = video_drvdata(file);
+
+	return radio->fops_release(file);
+}
+
+
 /*
  * si470x_fops - file operations interface
  */
@@ -570,13 +590,13 @@ static int si470x_s_ctrl(struct v4l2_ctrl *ctrl)
 	case V4L2_CID_AUDIO_VOLUME:
 		radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_VOLUME;
 		radio->registers[SYSCONFIG2] |= ctrl->val;
-		return si470x_set_register(radio, SYSCONFIG2);
+		return radio->set_register(radio, SYSCONFIG2);
 	case V4L2_CID_AUDIO_MUTE:
 		if (ctrl->val)
 			radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
 		else
 			radio->registers[POWERCFG] |= POWERCFG_DMUTE;
-		return si470x_set_register(radio, POWERCFG);
+		return radio->set_register(radio, POWERCFG);
 	default:
 		return -EINVAL;
 	}
@@ -596,7 +616,7 @@ static int si470x_vidioc_g_tuner(struct file *file, void *priv,
 		return -EINVAL;
 
 	if (!radio->status_rssi_auto_update) {
-		retval = si470x_get_register(radio, STATUSRSSI);
+		retval = radio->get_register(radio, STATUSRSSI);
 		if (retval < 0)
 			return retval;
 	}
@@ -665,7 +685,7 @@ static int si470x_vidioc_s_tuner(struct file *file, void *priv,
 		break;
 	}
 
-	return si470x_set_register(radio, POWERCFG);
+	return radio->set_register(radio, POWERCFG);
 }
 
 
@@ -742,6 +762,15 @@ static int si470x_vidioc_enum_freq_bands(struct file *file, void *priv,
 const struct v4l2_ctrl_ops si470x_ctrl_ops = {
 	.s_ctrl = si470x_s_ctrl,
 };
+EXPORT_SYMBOL_GPL(si470x_ctrl_ops);
+
+static int si470x_vidioc_querycap(struct file *file, void *priv,
+		struct v4l2_capability *capability)
+{
+	struct si470x_device *radio = video_drvdata(file);
+
+	return radio->vidioc_querycap(file, priv, capability);
+};
 
 /*
  * si470x_ioctl_ops - video device ioctl operations
@@ -768,3 +797,6 @@ const struct video_device si470x_viddev_template = {
 	.release		= video_device_release_empty,
 	.ioctl_ops		= &si470x_ioctl_ops,
 };
+EXPORT_SYMBOL_GPL(si470x_viddev_template);
+
+MODULE_LICENSE("GPL");

drivers/media/radio/si470x/radio-si470x-i2c.c

@@ -89,7 +89,7 @@ MODULE_PARM_DESC(max_rds_errors, "RDS maximum block errors: *1*");
 /*
  * si470x_get_register - read register
  */
-int si470x_get_register(struct si470x_device *radio, int regnr)
+static int si470x_get_register(struct si470x_device *radio, int regnr)
 {
 	u16 buf[READ_REG_NUM];
 	struct i2c_msg msgs[1] = {
@@ -113,7 +113,7 @@ int si470x_get_register(struct si470x_device *radio, int regnr)
 /*
  * si470x_set_register - write register
  */
-int si470x_set_register(struct si470x_device *radio, int regnr)
+static int si470x_set_register(struct si470x_device *radio, int regnr)
 {
 	int i;
 	u16 buf[WRITE_REG_NUM];
@@ -174,7 +174,7 @@ static int si470x_get_all_registers(struct si470x_device *radio)
 /*
  * si470x_fops_open - file open
  */
-int si470x_fops_open(struct file *file)
+static int si470x_fops_open(struct file *file)
 {
 	struct si470x_device *radio = video_drvdata(file);
 	int retval = v4l2_fh_open(file);
@@ -206,7 +206,7 @@ int si470x_fops_open(struct file *file)
 /*
  * si470x_fops_release - file release
  */
-int si470x_fops_release(struct file *file)
+static int si470x_fops_release(struct file *file)
 {
 	struct si470x_device *radio = video_drvdata(file);
 
@@ -226,8 +226,8 @@ int si470x_fops_release(struct file *file)
 /*
  * si470x_vidioc_querycap - query device capabilities
  */
-int si470x_vidioc_querycap(struct file *file, void *priv,
-		struct v4l2_capability *capability)
+static int si470x_vidioc_querycap(struct file *file, void *priv,
+				  struct v4l2_capability *capability)
 {
 	strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
 	strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
@@ -361,6 +361,12 @@ static int si470x_i2c_probe(struct i2c_client *client,
 	mutex_init(&radio->lock);
 	init_completion(&radio->completion);
 
+	radio->get_register = si470x_get_register;
+	radio->set_register = si470x_set_register;
+	radio->fops_open = si470x_fops_open;
+	radio->fops_release = si470x_fops_release;
+	radio->vidioc_querycap = si470x_vidioc_querycap;
+
 	retval = v4l2_device_register(&client->dev, &radio->v4l2_dev);
 	if (retval < 0) {
 		dev_err(&client->dev, "couldn't register v4l2_device\n");

drivers/media/radio/si470x/radio-si470x-usb.c

@@ -250,7 +250,7 @@ static int si470x_set_report(struct si470x_device *radio, void *buf, int size)
 /*
  * si470x_get_register - read register
  */
-int si470x_get_register(struct si470x_device *radio, int regnr)
+static int si470x_get_register(struct si470x_device *radio, int regnr)
 {
 	int retval;
 
@@ -268,7 +268,7 @@ int si470x_get_register(struct si470x_device *radio, int regnr)
 /*
  * si470x_set_register - write register
  */
-int si470x_set_register(struct si470x_device *radio, int regnr)
+static int si470x_set_register(struct si470x_device *radio, int regnr)
 {
 	int retval;
 
@@ -482,12 +482,12 @@ static void si470x_int_in_callback(struct urb *urb)
 }
 
 
-int si470x_fops_open(struct file *file)
+static int si470x_fops_open(struct file *file)
 {
 	return v4l2_fh_open(file);
 }
 
-int si470x_fops_release(struct file *file)
+static int si470x_fops_release(struct file *file)
 {
 	return v4l2_fh_release(file);
 }
@@ -514,8 +514,8 @@ static void si470x_usb_release(struct v4l2_device *v4l2_dev)
 /*
  * si470x_vidioc_querycap - query device capabilities
  */
-int si470x_vidioc_querycap(struct file *file, void *priv,
-		struct v4l2_capability *capability)
+static int si470x_vidioc_querycap(struct file *file, void *priv,
+				  struct v4l2_capability *capability)
 {
 	struct si470x_device *radio = video_drvdata(file);
 
@@ -598,6 +598,12 @@ static int si470x_usb_driver_probe(struct usb_interface *intf,
 	mutex_init(&radio->lock);
 	init_completion(&radio->completion);
 
+	radio->get_register = si470x_get_register;
+	radio->set_register = si470x_set_register;
+	radio->fops_open = si470x_fops_open;
+	radio->fops_release = si470x_fops_release;
+	radio->vidioc_querycap = si470x_vidioc_querycap;
+
 	iface_desc = intf->cur_altsetting;
 
 	/* Set up interrupt endpoint information. */

drivers/media/radio/si470x/radio-si470x.h

@@ -161,6 +161,15 @@ struct si470x_device {
 	struct completion completion;
 	bool status_rssi_auto_update;	/* Does RSSI get updated automatic? */
 
+	/* si470x ops */
+
+	int (*get_register)(struct si470x_device *radio, int regnr);
+	int (*set_register)(struct si470x_device *radio, int regnr);
+	int (*fops_open)(struct file *file);
+	int (*fops_release)(struct file *file);
+	int (*vidioc_querycap)(struct file *file, void *priv,
+			       struct v4l2_capability *capability);
+
 #if IS_ENABLED(CONFIG_USB_SI470X)
 	/* reference to USB and video device */
 	struct usb_device *usbdev;
@@ -213,13 +222,7 @@ struct si470x_device {
  **************************************************************************/
 extern const struct video_device si470x_viddev_template;
 extern const struct v4l2_ctrl_ops si470x_ctrl_ops;
-int si470x_get_register(struct si470x_device *radio, int regnr);
-int si470x_set_register(struct si470x_device *radio, int regnr);
 int si470x_disconnect_check(struct si470x_device *radio);
 int si470x_set_freq(struct si470x_device *radio, unsigned int freq);
 int si470x_start(struct si470x_device *radio);
 int si470x_stop(struct si470x_device *radio);
-int si470x_fops_open(struct file *file);
-int si470x_fops_release(struct file *file);
-int si470x_vidioc_querycap(struct file *file, void *priv,
-		struct v4l2_capability *capability);