V4L/DVB (12416): radio-si470x: add i2c driver for si470x (cc35bbdd) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/media/radio/si470x/Kconfig

+13 −0

Original line number	Original line	Diff line number	Diff line
	@@ -22,3 +22,16 @@ config USB_SI470X

	To compile this driver as a module, choose M here: the		To compile this driver as a module, choose M here: the
	module will be called radio-usb-si470x.		module will be called radio-usb-si470x.

			config I2C_SI470X
			tristate "Silicon Labs Si470x FM Radio Receiver support with I2C"
			depends on I2C && RADIO_SI470X && !USB_SI470X
			---help---
			This is a driver for I2C devices with the Silicon Labs SI470x
			chip.

			Say Y here if you want to connect this type of radio to your
			computer's I2C port.

			To compile this driver as a module, choose M here: the
			module will be called radio-i2c-si470x.

drivers/media/radio/si470x/Makefile

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -3,5 +3,7 @@
	#		#

	radio-usb-si470x-objs := radio-si470x-usb.o radio-si470x-common.o		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_USB_SI470X) += radio-usb-si470x.o
			obj-$(CONFIG_I2C_SI470X) += radio-i2c-si470x.o

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

+6 −0

Original line number	Original line	Diff line number	Diff line
	@@ -581,8 +581,12 @@ static int si470x_vidioc_g_tuner(struct file file, void priv,
	/* driver constants */		/* driver constants */
	strcpy(tuner->name, "FM");		strcpy(tuner->name, "FM");
	tuner->type = V4L2_TUNER_RADIO;		tuner->type = V4L2_TUNER_RADIO;
			#if defined(CONFIG_USB_SI470X) \|\| defined(CONFIG_USB_SI470X_MODULE)
	tuner->capability = V4L2_TUNER_CAP_LOW \| V4L2_TUNER_CAP_STEREO \|		tuner->capability = V4L2_TUNER_CAP_LOW \| V4L2_TUNER_CAP_STEREO \|
	V4L2_TUNER_CAP_RDS;		V4L2_TUNER_CAP_RDS;
			#else
			tuner->capability = V4L2_TUNER_CAP_LOW \| V4L2_TUNER_CAP_STEREO;
			#endif

	/* range limits */		/* range limits */
	switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {		switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
	@@ -608,10 +612,12 @@ static int si470x_vidioc_g_tuner(struct file file, void priv,
	tuner->rxsubchans = V4L2_TUNER_SUB_MONO;		tuner->rxsubchans = V4L2_TUNER_SUB_MONO;
	else		else
	tuner->rxsubchans = V4L2_TUNER_SUB_MONO \| V4L2_TUNER_SUB_STEREO;		tuner->rxsubchans = V4L2_TUNER_SUB_MONO \| V4L2_TUNER_SUB_STEREO;
			#if defined(CONFIG_USB_SI470X) \|\| defined(CONFIG_USB_SI470X_MODULE)
	/* If there is a reliable method of detecting an RDS channel,		/* If there is a reliable method of detecting an RDS channel,
	then this code should check for that before setting this		then this code should check for that before setting this
	RDS subchannel. */		RDS subchannel. */
	tuner->rxsubchans \|= V4L2_TUNER_SUB_RDS;		tuner->rxsubchans \|= V4L2_TUNER_SUB_RDS;
			#endif

	/* mono/stereo selector */		/* mono/stereo selector */
	if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 0)		if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 0)

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

0 → 100644

+254 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* drivers/media/radio/si470x/radio-si470x-i2c.c
			*
			* I2C driver for radios with Silicon Labs Si470x FM Radio Receivers
			*
			* Copyright (C) 2009 Samsung Electronics Co.Ltd
			* Author: Joonyoung Shim <jy0922.shim@samsung.com>
			*
			* This program is free software; you can redistribute it and/or modify it
			* under the terms of the GNU General Public License as published by the
			* Free Software Foundation; either version 2 of the License, or (at your
			* option) any later version.
			*
			*
			* TODO:
			* - RDS support
			*
			*/

			#include <linux/module.h>
			#include <linux/init.h>
			#include <linux/i2c.h>
			#include <linux/delay.h>

			#include "radio-si470x.h"

			#define DRIVER_KERNEL_VERSION KERNEL_VERSION(1, 0, 0)
			#define DRIVER_CARD "Silicon Labs Si470x FM Radio Receiver"
			#define DRIVER_VERSION "1.0.0"

			/* starting with the upper byte of register 0x0a */
			#define READ_REG_NUM RADIO_REGISTER_NUM
			#define READ_INDEX(i) ((i + RADIO_REGISTER_NUM - 0x0a) % READ_REG_NUM)

			static int si470x_get_all_registers(struct si470x_device *radio)
			{
			int i;
			u16 buf[READ_REG_NUM];
			struct i2c_msg msgs[1] = {
			{ radio->client->addr, I2C_M_RD, sizeof(u16) * READ_REG_NUM,
			(void *)buf },
			};

			if (i2c_transfer(radio->client->adapter, msgs, 1) != 1)
			return -EIO;

			for (i = 0; i < READ_REG_NUM; i++)
			radio->registers[i] = __be16_to_cpu(buf[READ_INDEX(i)]);

			return 0;
			}

			int si470x_get_register(struct si470x_device *radio, int regnr)
			{
			u16 buf[READ_REG_NUM];
			struct i2c_msg msgs[1] = {
			{ radio->client->addr, I2C_M_RD, sizeof(u16) * READ_REG_NUM,
			(void *)buf },
			};

			if (i2c_transfer(radio->client->adapter, msgs, 1) != 1)
			return -EIO;

			radio->registers[regnr] = __be16_to_cpu(buf[READ_INDEX(regnr)]);

			return 0;
			}

			/* starting with the upper byte of register 0x02h */
			#define WRITE_REG_NUM 8
			#define WRITE_INDEX(i) (i + 0x02)

			int si470x_set_register(struct si470x_device *radio, int regnr)
			{
			int i;
			u16 buf[WRITE_REG_NUM];
			struct i2c_msg msgs[1] = {
			{ radio->client->addr, 0, sizeof(u16) * WRITE_REG_NUM,
			(void *)buf },
			};

			for (i = 0; i < WRITE_REG_NUM; i++)
			buf[i] = __cpu_to_be16(radio->registers[WRITE_INDEX(i)]);

			if (i2c_transfer(radio->client->adapter, msgs, 1) != 1)
			return -EIO;

			return 0;
			}

			int si470x_disconnect_check(struct si470x_device *radio)
			{
			return 0;
			}

			static int si470x_fops_open(struct file *file)
			{
			struct si470x_device *radio = video_drvdata(file);
			int retval = 0;

			mutex_lock(&radio->lock);
			radio->users++;

			if (radio->users == 1)
			/* start radio */
			retval = si470x_start(radio);
			mutex_unlock(&radio->lock);

			return retval;
			}

			static int si470x_fops_release(struct file *file)
			{
			struct si470x_device *radio = video_drvdata(file);
			int retval = 0;

			/* safety check */
			if (!radio)
			return -ENODEV;

			mutex_lock(&radio->lock);
			radio->users--;
			if (radio->users == 0)
			/* stop radio */
			retval = si470x_stop(radio);
			mutex_unlock(&radio->lock);

			return retval;
			}

			const struct v4l2_file_operations si470x_fops = {
			.owner = THIS_MODULE,
			.ioctl = video_ioctl2,
			.open = si470x_fops_open,
			.release = si470x_fops_release,
			};

			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));
			capability->version = DRIVER_KERNEL_VERSION;
			capability->capabilities = V4L2_CAP_HW_FREQ_SEEK \|
			V4L2_CAP_TUNER \| V4L2_CAP_RADIO;

			return 0;
			}

			static int __devinit si470x_i2c_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
			{
			struct si470x_device *radio;
			int retval = 0;

			/* private data allocation and initialization */
			radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
			if (!radio) {
			retval = -ENOMEM;
			goto err_initial;
			}
			radio->client = client;
			radio->users = 0;
			mutex_init(&radio->lock);

			/* video device allocation and initialization */
			radio->videodev = video_device_alloc();
			if (!radio->videodev) {
			retval = -ENOMEM;
			goto err_radio;
			}
			memcpy(radio->videodev, &si470x_viddev_template,
			sizeof(si470x_viddev_template));
			video_set_drvdata(radio->videodev, radio);

			/* power up : need 110ms */
			radio->registers[POWERCFG] = POWERCFG_ENABLE;
			if (si470x_set_register(radio, POWERCFG) < 0) {
			retval = -EIO;
			goto err_all;
			}
			msleep(110);

			/* show some infos about the specific si470x device */
			if (si470x_get_all_registers(radio) < 0) {
			retval = -EIO;
			goto err_radio;
			}
			dev_info(&client->dev, "DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
			radio->registers[DEVICEID], radio->registers[CHIPID]);

			/* set initial frequency */
			si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */

			/* register video device */
			retval = video_register_device(radio->videodev, VFL_TYPE_RADIO, -1);
			if (retval) {
			dev_warn(&client->dev, "Could not register video device\n");
			goto err_all;
			}

			i2c_set_clientdata(client, radio);

			return 0;
			err_all:
			video_device_release(radio->videodev);
			err_radio:
			kfree(radio);
			err_initial:
			return retval;
			}

			static __devexit int si470x_i2c_remove(struct i2c_client *client)
			{
			struct si470x_device *radio = i2c_get_clientdata(client);

			video_unregister_device(radio->videodev);
			kfree(radio);
			i2c_set_clientdata(client, NULL);

			return 0;
			}

			static const struct i2c_device_id si470x_i2c_id[] = {
			{ "si470x", 0 },
			{ }
			};
			MODULE_DEVICE_TABLE(i2c, si470x_i2c_id);

			static struct i2c_driver si470x_i2c_driver = {
			.driver = {
			.name = "si470x",
			.owner = THIS_MODULE,
			},
			.probe = si470x_i2c_probe,
			.remove = __devexit_p(si470x_i2c_remove),
			.id_table = si470x_i2c_id,
			};

			static int __init si470x_i2c_init(void)
			{
			return i2c_add_driver(&si470x_i2c_driver);
			}
			module_init(si470x_i2c_init);

			static void __exit si470x_i2c_exit(void)
			{
			i2c_del_driver(&si470x_i2c_driver);
			}
			module_exit(si470x_i2c_exit);

			MODULE_DESCRIPTION("i2c radio driver for si470x fm radio receivers");
			MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
			MODULE_LICENSE("GPL");

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

+6 −0

Original line number	Original line	Diff line number	Diff line
	@@ -143,6 +143,11 @@
	struct si470x_device {		struct si470x_device {
	struct video_device *videodev;		struct video_device *videodev;

			#if defined(CONFIG_I2C_SI470X) \|\| defined(CONFIG_I2C_SI470X_MODULE)
			struct i2c_client *client;
			#endif

			#if defined(CONFIG_USB_SI470X) \|\| defined(CONFIG_USB_SI470X_MODULE)
	/* reference to USB and video device */		/* reference to USB and video device */
	struct usb_device *usbdev;		struct usb_device *usbdev;
	struct usb_interface *intf;		struct usb_interface *intf;
	@@ -160,6 +165,7 @@ struct si470x_device {
	/* driver management */		/* driver management */
	unsigned char disconnected;		unsigned char disconnected;
	struct mutex disconnect_lock;		struct mutex disconnect_lock;
			#endif
	unsigned int users;		unsigned int users;

	/* Silabs internal registers (0..15) */		/* Silabs internal registers (0..15) */