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linux-sg2042/drivers/media/radio/radio-tea5764.c

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/*
* 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 <belavenuto@gmail.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.
*
* 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.
*
* History:
* 2008-12-06 Fabio Belavenuto <belavenuto@gmail.com>
* initial code
*
* TODO:
* add platform_data support for IRQs platform dependencies
* add RDS support
*/
#include <linux/kernel.h>
#include <linux/slab.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 <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#define DRIVER_VERSION "0.0.2"
#define DRIVER_AUTHOR "Fabio Belavenuto <belavenuto@gmail.com>"
#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__)
# define PDEBUG(format, ...)\
printk(KERN_DEBUG KBUILD_MODNAME ": "\
DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
/* Frequency limits in MHz -- these are European values. For Japanese
devices, that would be 76000 and 91000. */
#define FREQ_MIN 87500U
#define FREQ_MAX 108000U
#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 */
__be16 frqset; /* FRQSETMSB & FRQSETLSB */
__be16 tnctrl; /* TNCTRL1 & TNCTRL2 */
__be16 testreg; /* TESTBITS & TESTMODE */
__be16 rdsctrl; /* RDSCTRL1 & RDSCTRL2 */
__be16 rdsbbl; /* PAUSEDET & RDSBBL */
} __attribute__ ((packed));
#ifdef CONFIG_RADIO_TEA5764_XTAL
#define RADIO_TEA5764_XTAL 1
#else
#define RADIO_TEA5764_XTAL 0
#endif
static int radio_nr = -1;
static int use_xtal = RADIO_TEA5764_XTAL;
struct tea5764_device {
struct v4l2_device v4l2_dev;
struct v4l2_ctrl_handler ctrl_handler;
struct i2c_client *i2c_client;
struct video_device vdev;
struct tea5764_regs regs;
struct mutex mutex;
};
/* I2C code related */
static int tea5764_i2c_read(struct tea5764_device *radio)
{
int i;
u16 *p = (u16 *) &radio->regs;
struct i2c_msg msgs[1] = {
{ .addr = radio->i2c_client->addr,
.flags = I2C_M_RD,
.len = sizeof(radio->regs),
.buf = (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((__force __be16)p[i]);
return 0;
}
static int tea5764_i2c_write(struct tea5764_device *radio)
{
struct tea5764_write_regs wr;
struct tea5764_regs *r = &radio->regs;
struct i2c_msg msgs[1] = {
{
.addr = radio->i2c_client->addr,
.len = sizeof(wr),
.buf = (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;
}
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);
}
/* 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->vdev;
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_name(&dev->dev));
v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
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;
strlcpy(v->name, "FM", sizeof(v->name));
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;
else
v->rxsubchans = V4L2_TUNER_SUB_MONO;
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,
const 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,
const struct v4l2_frequency *f)
{
struct tea5764_device *radio = video_drvdata(file);
unsigned freq = f->frequency;
if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
return -EINVAL;
if (freq == 0) {
/* We special case this as a power down control. */
tea5764_power_down(radio);
/* Yes, that's what is returned in this case. This
whole special case is non-compliant and should really
be replaced with something better, but changing this
might well break code that depends on this behavior.
So we keep it as-is. */
return -EINVAL;
}
freq = clamp(freq, FREQ_MIN * FREQ_MUL, FREQ_MAX * FREQ_MUL);
tea5764_power_up(radio);
tea5764_tune(radio, (freq * 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;
if (f->tuner != 0)
return -EINVAL;
tea5764_i2c_read(radio);
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 tea5764_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct tea5764_device *radio =
container_of(ctrl->handler, struct tea5764_device, ctrl_handler);
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
tea5764_mute(radio, ctrl->val);
return 0;
}
return -EINVAL;
}
static const struct v4l2_ctrl_ops tea5764_ctrl_ops = {
.s_ctrl = tea5764_s_ctrl,
};
/* File system interface */
static const struct v4l2_file_operations tea5764_fops = {
.owner = THIS_MODULE,
.open = v4l2_fh_open,
.release = v4l2_fh_release,
.poll = v4l2_ctrl_poll,
.unlocked_ioctl = video_ioctl2,
};
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_frequency = vidioc_g_frequency,
.vidioc_s_frequency = vidioc_s_frequency,
.vidioc_log_status = v4l2_ctrl_log_status,
.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};
/* 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_empty,
};
/* I2C probe: check if the device exists and register with v4l if it is */
static int tea5764_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct tea5764_device *radio;
struct v4l2_device *v4l2_dev;
struct v4l2_ctrl_handler *hdl;
struct tea5764_regs *r;
int ret;
PDEBUG("probe");
radio = kzalloc(sizeof(struct tea5764_device), GFP_KERNEL);
if (!radio)
return -ENOMEM;
v4l2_dev = &radio->v4l2_dev;
ret = v4l2_device_register(&client->dev, v4l2_dev);
if (ret < 0) {
v4l2_err(v4l2_dev, "could not register v4l2_device\n");
goto errfr;
}
hdl = &radio->ctrl_handler;
v4l2_ctrl_handler_init(hdl, 1);
v4l2_ctrl_new_std(hdl, &tea5764_ctrl_ops,
V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
v4l2_dev->ctrl_handler = hdl;
if (hdl->error) {
ret = hdl->error;
v4l2_err(v4l2_dev, "Could not register controls\n");
goto errunreg;
}
mutex_init(&radio->mutex);
radio->i2c_client = client;
ret = tea5764_i2c_read(radio);
if (ret)
goto errunreg;
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 errunreg;
}
radio->vdev = tea5764_radio_template;
i2c_set_clientdata(client, radio);
video_set_drvdata(&radio->vdev, radio);
radio->vdev.lock = &radio->mutex;
radio->vdev.v4l2_dev = v4l2_dev;
/* 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);
ret = video_register_device(&radio->vdev, VFL_TYPE_RADIO, radio_nr);
if (ret < 0) {
PWARN("Could not register video device!");
goto errunreg;
}
PINFO("registered.");
return 0;
errunreg:
v4l2_ctrl_handler_free(hdl);
v4l2_device_unregister(v4l2_dev);
errfr:
kfree(radio);
return ret;
}
static int 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->vdev);
v4l2_ctrl_handler_free(&radio->ctrl_handler);
v4l2_device_unregister(&radio->v4l2_dev);
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",
},
.probe = tea5764_i2c_probe,
.remove = tea5764_i2c_remove,
.id_table = tea5764_id,
};
module_i2c_driver(tea5764_i2c_driver);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_VERSION(DRIVER_VERSION);
module_param(use_xtal, int, 0);
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");
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