V4L/DVB (12416): radio-si470x: add i2c driver for si470x (cc35bbdd) · Commits · 戴 / test

drivers/media/radio/si470x/Kconfig

+13 −0

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

		To compile this driver as a module, choose M here: the
		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	Diff line number	Diff line
		@@ -3,5 +3,7 @@
		#

		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

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

+6 −0

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

		/* range limits */
		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;
		else
		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,
		then this code should check for that before setting this
		RDS subchannel. */
		tuner->rxsubchans \|= V4L2_TUNER_SUB_RDS;
		#endif

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

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

0 → 100644

+254 −0

Original line number	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	Diff line number	Diff line
		@@ -143,6 +143,11 @@
		struct si470x_device {
		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 */
		struct usb_device *usbdev;
		struct usb_interface *intf;
		@@ -160,6 +165,7 @@ struct si470x_device {
		/* driver management */
		unsigned char disconnected;
		struct mutex disconnect_lock;
		#endif
		unsigned int users;

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

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