Add TEA5764 Linux radio driver

 

  
  

    
    
From :
 
"Fabio Belavenuto" <[e-mail]>
To :
 
[e-mail]
Subject :
 
[PATCH] Add TEA5764 radio driver
Date :
 
Wed, 17 Dec 2008 20:49:33 -0200



 
 

Add support for radio driver TEA5764 from NXP.

This chip is connected in pxa I2C bus in EZX phones

from Motorola, the chip is used in phone model A1200.

This driver is for OpenEZX project (www.openezx.org)

Tested with A1200 phone, openezx kernel and fm-tools



Signed-off-by: Fabio Belavenuto <[e-mail]>



 drivers/media/radio/Kconfig         |   19 +

 drivers/media/radio/Makefile        |    1 +

 drivers/media/radio/radio-tea5764.c |  641 +++++++++++++++++++++++++++++++++++

 3 files changed, 661 insertions(+), 0 deletions(-)

 

diff --git a/drivers/media/radio/Kconfig b/drivers/media/radio/Kconfig index 5189c4e..3315cac 100644 --- a/drivers/media/radio/Kconfig +++ b/drivers/media/radio/Kconfig @@ -387,4 +387,23 @@ config USB_MR800 To compile this driver as a module, choose M here: the module will be called radio-mr800. +config RADIO_TEA5764 + tristate "TEA5764 I2C FM radio support" + depends on I2C && VIDEO_V4L2 + ---help--- + Say Y here if you want to use the TEA5764 FM chip found in + EZX phones. This FM chip is present in EZX phones from Motorola, + connected to internal pxa I2C bus. + + To compile this driver as a module, choose M here: the + module will be called radio-tea5764. + +config RADIO_TEA5764_XTAL + bool "TEA5764 crystal reference" + depends on RADIO_TEA5764=y + default y + help + Say Y here if TEA5764 have a 32768 Hz crystal in circuit, say N + here if TEA5764 reference frequency is connected in FREQIN. + endif # RADIO_ADAPTERS diff --git a/drivers/media/radio/Makefile b/drivers/media/radio/Makefile index 240ec63..0f2b35b 100644 --- a/drivers/media/radio/Makefile +++ b/drivers/media/radio/Makefile @@ -19,5 +19,6 @@ obj-$(CONFIG_RADIO_MAESTRO) += radio-maestro.o obj-$(CONFIG_USB_DSBR) += dsbr100.o obj-$(CONFIG_USB_SI470X) += radio-si470x.o obj-$(CONFIG_USB_MR800) += radio-mr800.o +obj-$(CONFIG_RADIO_TEA5764) += radio-tea5764.o EXTRA_CFLAGS += -Isound diff --git a/drivers/media/radio/radio-tea5764.c b/drivers/media/radio/radio-tea5764.c new file mode 100644 index 0000000..3e60688 --- /dev/null +++ b/drivers/media/radio/radio-tea5764.c @@ -0,0 +1,641 @@ +/* + * driver/media/radio/radio-tea5764.c + * + * Driver for TEA5764 radio chip for linux 2.6. + * This driver is for TEA5764 chip from NXP, used in EZX phones from Motorola. + * The I2C protocol is used for communicate with chip. + * + * Based in radio-tea5761.c Copyright (C) 2005 Nokia Corporation + * + * Copyright (c) 2008 Fabio Belavenuto <[e-mail]> + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * History: + * 2008-12-06 Fabio Belavenuto <[e-mail]> + * initial code + * + * TODO: + * add platform_data support for IRQs platform dependencies + * add RDS support + */ +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> /* Initdata */ +#include <linux/videodev2.h> /* kernel radio structs */ +#include <linux/i2c.h> /* I2C */ +#include <media/v4l2-common.h> +#include <media/v4l2-ioctl.h> +#include <linux/version.h> /* for KERNEL_VERSION MACRO */ + +#define DRIVER_VERSION "v0.01" +#define RADIO_VERSION KERNEL_VERSION(0, 0, 1) + +#define DRIVER_AUTHOR "Fabio Belavenuto <[e-mail]>" +#define DRIVER_DESC "A driver for the TEA5764 radio chip for EZX Phones." + +#define PINFO(format, ...)/ + printk(KERN_INFO KBUILD_MODNAME ": "/ + DRIVER_VERSION ": " format "/n", ## __VA_ARGS__) +#define PWARN(format, ...)/ + printk(KERN_WARNING KBUILD_MODNAME ": "/ + DRIVER_VERSION ": " format "/n", ## __VA_ARGS__) +#if 1 +# define PDEBUG(format, ...)/ + printk(KERN_DEBUG KBUILD_MODNAME ": "/ + DRIVER_VERSION ": " format "/n", ## __VA_ARGS__) +#else +# define PDEBUG(format, ...) +#endif + +/* Frequency limits in MHz -- these are European values. For Japanese +devices, that would be 76000 and 91000. */ +#define FREQ_MIN 87500 +#define FREQ_MAX 108000 +#define FREQ_MUL 16 + +/* TEA5764 registers */ +#define TEA5764_MANID 0x002b +#define TEA5764_CHIPID 0x5764 + +#define TEA5764_INTREG_BLMSK 0x0001 +#define TEA5764_INTREG_FRRMSK 0x0002 +#define TEA5764_INTREG_LEVMSK 0x0008 +#define TEA5764_INTREG_IFMSK 0x0010 +#define TEA5764_INTREG_BLMFLAG 0x0100 +#define TEA5764_INTREG_FRRFLAG 0x0200 +#define TEA5764_INTREG_LEVFLAG 0x0800 +#define TEA5764_INTREG_IFFLAG 0x1000 + +#define TEA5764_FRQSET_SUD 0x8000 +#define TEA5764_FRQSET_SM 0x4000 + +#define TEA5764_TNCTRL_PUPD1 0x8000 +#define TEA5764_TNCTRL_PUPD0 0x4000 +#define TEA5764_TNCTRL_BLIM 0x2000 +#define TEA5764_TNCTRL_SWPM 0x1000 +#define TEA5764_TNCTRL_IFCTC 0x0800 +#define TEA5764_TNCTRL_AFM 0x0400 +#define TEA5764_TNCTRL_SMUTE 0x0200 +#define TEA5764_TNCTRL_SNC 0x0100 +#define TEA5764_TNCTRL_MU 0x0080 +#define TEA5764_TNCTRL_SSL1 0x0040 +#define TEA5764_TNCTRL_SSL0 0x0020 +#define TEA5764_TNCTRL_HLSI 0x0010 +#define TEA5764_TNCTRL_MST 0x0008 +#define TEA5764_TNCTRL_SWP 0x0004 +#define TEA5764_TNCTRL_DTC 0x0002 +#define TEA5764_TNCTRL_AHLSI 0x0001 + +#define TEA5764_TUNCHK_LEVEL(x) (((x) & 0x00F0) >> 4) +#define TEA5764_TUNCHK_IFCNT(x) (((x) & 0xFE00) >> 9) +#define TEA5764_TUNCHK_TUNTO 0x0100 +#define TEA5764_TUNCHK_LD 0x0008 +#define TEA5764_TUNCHK_STEREO 0x0004 + +#define TEA5764_TESTREG_TRIGFR 0x0800 + +struct tea5764_regs { + u16 intreg; /* INTFLAG & INTMSK */ + u16 frqset; /* FRQSETMSB & FRQSETLSB */ + u16 tnctrl; /* TNCTRL1 & TNCTRL2 */ + u16 frqchk; /* FRQCHKMSB & FRQCHKLSB */ + u16 tunchk; /* IFCHK & LEVCHK */ + u16 testreg; /* TESTBITS & TESTMODE */ + u16 rdsstat; /* RDSSTAT1 & RDSSTAT2 */ + u16 rdslb; /* RDSLBMSB & RDSLBLSB */ + u16 rdspb; /* RDSPBMSB & RDSPBLSB */ + u16 rdsbc; /* RDSBBC & RDSGBC */ + u16 rdsctrl; /* RDSCTRL1 & RDSCTRL2 */ + u16 rdsbbl; /* PAUSEDET & RDSBBL */ + u16 manid; /* MANID1 & MANID2 */ + u16 chipid; /* CHIPID1 & CHIPID2 */ +} __attribute__ ((packed)); + +struct tea5764_write_regs { + u8 intreg; /* INTMSK */ + u16 frqset; /* FRQSETMSB & FRQSETLSB */ + u16 tnctrl; /* TNCTRL1 & TNCTRL2 */ + u16 testreg; /* TESTBITS & TESTMODE */ + u16 rdsctrl; /* RDSCTRL1 & RDSCTRL2 */ + u16 rdsbbl; /* PAUSEDET & RDSBBL */ +} __attribute__ ((packed)); + +#ifndef RADIO_TEA5764_XTAL +#define RADIO_TEA5764_XTAL 1 +#endif + +static int radio_nr = -1; +static int use_xtal = RADIO_TEA5764_XTAL; + +struct tea5764_device { + struct i2c_client *i2c_client; + struct video_device *videodev; + struct tea5764_regs regs; + struct mutex mutex; + int users; +}; + +/* I2C code related */ +int tea5764_i2c_read(struct tea5764_device *radio) +{ + int i; + u16 *p = (u16 *) &radio->regs; + + struct i2c_msg msgs[1] = { + { radio->i2c_client->addr, I2C_M_RD, sizeof(radio->regs), + (void *)&radio->regs }, + }; + if (i2c_transfer(radio->i2c_client->adapter, msgs, 1) != 1) + return -EIO; + for (i = 0; i < sizeof(struct tea5764_regs) / sizeof(u16); i++) + p[i] = __be16_to_cpu(p[i]); + + return 0; +} + +int tea5764_i2c_write(struct tea5764_device *radio) +{ + struct tea5764_write_regs wr; + struct tea5764_regs *r = &radio->regs; + struct i2c_msg msgs[1] = { + { radio->i2c_client->addr, 0, sizeof(wr), (void *) &wr }, + }; + wr.intreg = r->intreg & 0xff; + wr.frqset = __cpu_to_be16(r->frqset); + wr.tnctrl = __cpu_to_be16(r->tnctrl); + wr.testreg = __cpu_to_be16(r->testreg); + wr.rdsctrl = __cpu_to_be16(r->rdsctrl); + wr.rdsbbl = __cpu_to_be16(r->rdsbbl); + if (i2c_transfer(radio->i2c_client->adapter, msgs, 1) != 1) + return -EIO; + return 0; +} + +/* V4L2 code related */ +static struct v4l2_queryctrl radio_qctrl[] = { + { + .id = V4L2_CID_AUDIO_MUTE, + .name = "Mute", + .minimum = 0, + .maximum = 1, + .default_value = 1, + .type = V4L2_CTRL_TYPE_BOOLEAN, + } +}; + +static void tea5764_power_up(struct tea5764_device *radio) +{ + struct tea5764_regs *r = &radio->regs; + + if (!(r->tnctrl & TEA5764_TNCTRL_PUPD0)) { + r->tnctrl &= ~(TEA5764_TNCTRL_AFM | TEA5764_TNCTRL_MU | + TEA5764_TNCTRL_HLSI); + if (!use_xtal) + r->testreg |= TEA5764_TESTREG_TRIGFR; + else + r->testreg &= ~TEA5764_TESTREG_TRIGFR; + + r->tnctrl |= TEA5764_TNCTRL_PUPD0; + tea5764_i2c_write(radio); + } +} + +static void tea5764_power_down(struct tea5764_device *radio) +{ + struct tea5764_regs *r = &radio->regs; + + if (r->tnctrl & TEA5764_TNCTRL_PUPD0) { + r->tnctrl &= ~TEA5764_TNCTRL_PUPD0; + tea5764_i2c_write(radio); + } +} + +static void tea5764_set_freq(struct tea5764_device *radio, int freq) +{ + struct tea5764_regs *r = &radio->regs; + + /* formula: (freq [+ or -] 225000) / 8192 */ + if (r->tnctrl & TEA5764_TNCTRL_HLSI) + r->frqset = (freq + 225000) / 8192; + else + r->frqset = (freq - 225000) / 8192; +} + +static int tea5764_get_freq(struct tea5764_device *radio) +{ + struct tea5764_regs *r = &radio->regs; + + if (r->tnctrl & TEA5764_TNCTRL_HLSI) + return (r->frqchk * 8192) - 225000; + else + return (r->frqchk * 8192) + 225000; +} + +/* tune an frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */ +static void tea5764_tune(struct tea5764_device *radio, int freq) +{ + tea5764_set_freq(radio, freq); + if (tea5764_i2c_write(radio)) + PWARN("Could not set frequency!"); +} + +static void tea5764_set_audout_mode(struct tea5764_device *radio, int audmode) +{ + struct tea5764_regs *r = &radio->regs; + int tnctrl = r->tnctrl; + + if (audmode == V4L2_TUNER_MODE_MONO) + r->tnctrl |= TEA5764_TNCTRL_MST; + else + r->tnctrl &= ~TEA5764_TNCTRL_MST; + if (tnctrl != r->tnctrl) + tea5764_i2c_write(radio); +} + +static int tea5764_get_audout_mode(struct tea5764_device *radio) +{ + struct tea5764_regs *r = &radio->regs; + + if (r->tnctrl & TEA5764_TNCTRL_MST) + return V4L2_TUNER_MODE_MONO; + else + return V4L2_TUNER_MODE_STEREO; +} + +static void tea5764_mute(struct tea5764_device *radio, int on) +{ + struct tea5764_regs *r = &radio->regs; + int tnctrl = r->tnctrl; + + if (on) + r->tnctrl |= TEA5764_TNCTRL_MU; + else + r->tnctrl &= ~TEA5764_TNCTRL_MU; + if (tnctrl != r->tnctrl) + tea5764_i2c_write(radio); +} + +static int tea5764_is_muted(struct tea5764_device *radio) +{ + return radio->regs.tnctrl & TEA5764_TNCTRL_MU; +} + +/* V4L2 vidioc */ +static int vidioc_querycap(struct file *file, void *priv, + struct v4l2_capability *v) +{ + struct tea5764_device *radio = video_drvdata(file); + struct video_device *dev = radio->videodev; + + strlcpy(v->driver, dev->dev.driver->name, sizeof (v->driver)); + strlcpy(v->card, dev->name, sizeof (v->card)); + snprintf(v->bus_info, sizeof(v->bus_info), "I2C:%s", dev->dev.bus_id); + v->version = RADIO_VERSION; + v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO; + return 0; +} + +static int vidioc_g_tuner(struct file *file, void *priv, + struct v4l2_tuner *v) +{ + struct tea5764_device *radio = video_drvdata(file); + struct tea5764_regs *r = &radio->regs; + + if (v->index > 0) + return -EINVAL; + + memset(v, 0, sizeof(v)); + strcpy(v->name, "FM"); + v->type = V4L2_TUNER_RADIO; + tea5764_i2c_read(radio); + v->rangelow = FREQ_MIN * FREQ_MUL; + v->rangehigh = FREQ_MAX * FREQ_MUL; + v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO; + if (r->tunchk & TEA5764_TUNCHK_STEREO) + v->rxsubchans = V4L2_TUNER_SUB_STEREO; + v->audmode = tea5764_get_audout_mode(radio); + v->signal = TEA5764_TUNCHK_LEVEL(r->tunchk) * 0xffff / 0xf; + v->afc = TEA5764_TUNCHK_IFCNT(r->tunchk); + + return 0; +} + +static int vidioc_s_tuner(struct file *file, void *priv, + struct v4l2_tuner *v) +{ + struct tea5764_device *radio = video_drvdata(file); + + if (v->index > 0) + return -EINVAL; + + tea5764_set_audout_mode(radio, v->audmode); + return 0; +} + +static int vidioc_s_frequency(struct file *file, void *priv, + struct v4l2_frequency *f) +{ + struct tea5764_device *radio = video_drvdata(file); + + if (f->tuner != 0) + return -EINVAL; + if (f->frequency == 0) { + /* We special case this as a power down control. */ + tea5764_power_down(radio); + } + if (f->frequency < (FREQ_MIN * FREQ_MUL)) + return -EINVAL; + if (f->frequency > (FREQ_MAX * FREQ_MUL)) + return -EINVAL; + tea5764_power_up(radio); + tea5764_tune(radio, (f->frequency * 125) / 2); + return 0; +} + +static int vidioc_g_frequency(struct file *file, void *priv, + struct v4l2_frequency *f) +{ + struct tea5764_device *radio = video_drvdata(file); + struct tea5764_regs *r = &radio->regs; + + tea5764_i2c_read(radio); + memset(f, 0, sizeof(f)); + f->type = V4L2_TUNER_RADIO; + if (r->tnctrl & TEA5764_TNCTRL_PUPD0) + f->frequency = (tea5764_get_freq(radio) * 2) / 125; + else + f->frequency = 0; + + return 0; +} + +static int vidioc_queryctrl(struct file *file, void *priv, + struct v4l2_queryctrl *qc) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) { + if (qc->id && qc->id == radio_qctrl[i].id) { + memcpy(qc, &(radio_qctrl[i]), sizeof(*qc)); + return 0; + } + } + return -EINVAL; +} + +static int vidioc_g_ctrl(struct file *file, void *priv, + struct v4l2_control *ctrl) +{ + struct tea5764_device *radio = video_drvdata(file); + + switch (ctrl->id) { + case V4L2_CID_AUDIO_MUTE: + tea5764_i2c_read(radio); + ctrl->value = tea5764_is_muted(radio) ? 1 : 0; + return 0; + } + return -EINVAL; +} + +static int vidioc_s_ctrl(struct file *file, void *priv, + struct v4l2_control *ctrl) +{ + struct tea5764_device *radio = video_drvdata(file); + + switch (ctrl->id) { + case V4L2_CID_AUDIO_MUTE: + tea5764_mute(radio, ctrl->value); + return 0; + } + return -EINVAL; +} + +static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i) +{ + *i = 0; + return 0; +} + +static int vidioc_s_input(struct file *filp, void *priv, unsigned int i) +{ + if (i != 0) + return -EINVAL; + return 0; +} + +static int vidioc_g_audio(struct file *file, void *priv, + struct v4l2_audio *a) +{ + if (a->index > 1) + return -EINVAL; + + strcpy(a->name, "Radio"); + a->capability = V4L2_AUDCAP_STEREO; + return 0; +} + +static int vidioc_s_audio(struct file *file, void *priv, + struct v4l2_audio *a) +{ + if (a->index != 0) + return -EINVAL; + + return 0; +} + +static int tea5764_open(struct inode *inode, struct file *file) +{ + /* Currently we support only one device */ + int minor = iminor(file->f_dentry->d_inode); + struct tea5764_device *radio = video_drvdata(file); + + if (radio->videodev->minor != minor) + return -ENODEV; + + mutex_lock(&radio->mutex); + /* Only exclusive access */ + if (radio->users) { + mutex_unlock(&radio->mutex); + return -EBUSY; + } + radio->users++; + mutex_unlock(&radio->mutex); + file->private_data = radio; + return 0; +} + +static int tea5764_close(struct inode *inode, struct file *file) +{ + struct tea5764_device *radio = video_drvdata(file); + + if (!radio) + return -ENODEV; + mutex_lock(&radio->mutex); + radio->users--; + mutex_unlock(&radio->mutex); + return 0; +} + +/* File system interface */ +static const struct file_operations tea5764_fops = { + .owner = THIS_MODULE, + .open = tea5764_open, + .release = tea5764_close, + .ioctl = video_ioctl2, +#ifdef CONFIG_COMPAT + .compat_ioctl = v4l_compat_ioctl32, +#endif + .llseek = no_llseek, +}; + +static const struct v4l2_ioctl_ops tea5764_ioctl_ops = { + .vidioc_querycap = vidioc_querycap, + .vidioc_g_tuner = vidioc_g_tuner, + .vidioc_s_tuner = vidioc_s_tuner, + .vidioc_g_audio = vidioc_g_audio, + .vidioc_s_audio = vidioc_s_audio, + .vidioc_g_input = vidioc_g_input, + .vidioc_s_input = vidioc_s_input, + .vidioc_g_frequency = vidioc_g_frequency, + .vidioc_s_frequency = vidioc_s_frequency, + .vidioc_queryctrl = vidioc_queryctrl, + .vidioc_g_ctrl = vidioc_g_ctrl, + .vidioc_s_ctrl = vidioc_s_ctrl, +}; + +/* V4L2 interface */ +static struct video_device tea5764_radio_template = { + .name = "TEA5764 FM-Radio", + .fops = &tea5764_fops, + .ioctl_ops = &tea5764_ioctl_ops, + .release = video_device_release, +}; + +/* I2C probe: check if the device exists and register with v4l if it is */ +static int __devinit tea5764_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct tea5764_device *radio; + struct tea5764_regs *r; + int ret; + + PDEBUG("probe"); + radio = kmalloc(sizeof(struct tea5764_device), GFP_KERNEL); + if (!radio) + return -ENOMEM; + + mutex_init(&radio->mutex); + radio->i2c_client = client; + if ((ret = tea5764_i2c_read(radio))) + goto errfr; + r = &radio->regs; + PDEBUG("chipid = %04X, manid = %04X", r->chipid, r->manid); + if (r->chipid != TEA5764_CHIPID || + (r->manid & 0x0fff) != TEA5764_MANID) { + PWARN("This chip is not a TEA5764!"); + ret = -EINVAL; + goto errfr; + } + + radio->videodev = video_device_alloc(); + if (!(radio->videodev)) { + ret = -ENOMEM; + goto errfr; + } + memcpy(radio->videodev, &tea5764_radio_template, + sizeof(tea5764_radio_template)); + + i2c_set_clientdata(client, radio); + video_set_drvdata(radio->videodev, radio); + + ret = video_register_device(radio->videodev, VFL_TYPE_RADIO, radio_nr); + if (ret < 0) { + PWARN("Could not register video device!"); + goto errrel; + } + + /* initialize and power off the chip */ + tea5764_i2c_read(radio); + tea5764_set_audout_mode(radio, V4L2_TUNER_MODE_STEREO); + tea5764_mute(radio, 1); + tea5764_power_down(radio); + + PINFO("registered."); + return 0; +errrel: + video_device_release(radio->videodev); +errfr: + kfree(radio); + return ret; +} + +static int __devexit tea5764_i2c_remove(struct i2c_client *client) +{ + struct tea5764_device *radio = i2c_get_clientdata(client); + + PDEBUG("remove"); + if (radio) { + tea5764_power_down(radio); + video_unregister_device(radio->videodev); + kfree(radio); + } + return 0; +} + +/* I2C subsystem interface */ +static const struct i2c_device_id tea5764_id[] = { + { "radio-tea5764", 0 }, + { } /* Terminating entry */ +}; +MODULE_DEVICE_TABLE(i2c, tea5764_id); + +static struct i2c_driver tea5764_i2c_driver = { + .driver = { + .name = "radio-tea5764", + .owner = THIS_MODULE, + }, + .probe = tea5764_i2c_probe, + .remove = __devexit_p(tea5764_i2c_remove), + .id_table = tea5764_id, +}; + +/* init the driver */ +static int __init tea5764_init(void) +{ + int ret = i2c_add_driver(&tea5764_i2c_driver); + + printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ": " + DRIVER_DESC "/n"); + return ret; +} + +/* cleanup the driver */ +static void __exit tea5764_exit(void) +{ + i2c_del_driver(&tea5764_i2c_driver); +} + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); + +module_param(use_xtal, int, 1); +MODULE_PARM_DESC(use_xtal, "Chip have a xtal connected in board"); +module_param(radio_nr, int, 0); +MODULE_PARM_DESC(radio_nr, "video4linux device number to use"); + +module_init(tea5764_init); +module_exit(tea5764_exit);