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OpenCloudOS-Kernel/drivers/media/radio/tea575x.c

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/*
* ALSA driver for TEA5757/5759 Philips AM/FM radio tuner chips
*
* Copyright (c) 2004 Jaroslav Kysela <perex@perex.cz>
*
*
* 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
*
*/
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <asm/io.h>
#include <media/v4l2-device.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-event.h>
#include <media/drv-intf/tea575x.h>
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Routines for control of TEA5757/5759 Philips AM/FM radio tuner chips");
MODULE_LICENSE("GPL");
/*
* definitions
*/
#define TEA575X_BIT_SEARCH (1<<24) /* 1 = search action, 0 = tuned */
#define TEA575X_BIT_UPDOWN (1<<23) /* 0 = search down, 1 = search up */
#define TEA575X_BIT_MONO (1<<22) /* 0 = stereo, 1 = mono */
#define TEA575X_BIT_BAND_MASK (3<<20)
#define TEA575X_BIT_BAND_FM (0<<20)
#define TEA575X_BIT_BAND_MW (1<<20)
#define TEA575X_BIT_BAND_LW (2<<20)
#define TEA575X_BIT_BAND_SW (3<<20)
#define TEA575X_BIT_PORT_0 (1<<19) /* user bit */
#define TEA575X_BIT_PORT_1 (1<<18) /* user bit */
#define TEA575X_BIT_SEARCH_MASK (3<<16) /* search level */
#define TEA575X_BIT_SEARCH_5_28 (0<<16) /* FM >5uV, AM >28uV */
#define TEA575X_BIT_SEARCH_10_40 (1<<16) /* FM >10uV, AM > 40uV */
#define TEA575X_BIT_SEARCH_30_63 (2<<16) /* FM >30uV, AM > 63uV */
#define TEA575X_BIT_SEARCH_150_1000 (3<<16) /* FM > 150uV, AM > 1000uV */
#define TEA575X_BIT_DUMMY (1<<15) /* buffer */
#define TEA575X_BIT_FREQ_MASK 0x7fff
enum { BAND_FM, BAND_FM_JAPAN, BAND_AM };
static const struct v4l2_frequency_band bands[] = {
{
.type = V4L2_TUNER_RADIO,
.index = 0,
.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
V4L2_TUNER_CAP_FREQ_BANDS,
.rangelow = 87500 * 16,
.rangehigh = 108000 * 16,
.modulation = V4L2_BAND_MODULATION_FM,
},
{
.type = V4L2_TUNER_RADIO,
.index = 0,
.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
V4L2_TUNER_CAP_FREQ_BANDS,
.rangelow = 76000 * 16,
.rangehigh = 91000 * 16,
.modulation = V4L2_BAND_MODULATION_FM,
},
{
.type = V4L2_TUNER_RADIO,
.index = 1,
.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS,
.rangelow = 530 * 16,
.rangehigh = 1710 * 16,
.modulation = V4L2_BAND_MODULATION_AM,
},
};
/*
* lowlevel part
*/
static void snd_tea575x_write(struct snd_tea575x *tea, unsigned int val)
{
u16 l;
u8 data;
if (tea->ops->write_val)
return tea->ops->write_val(tea, val);
tea->ops->set_direction(tea, 1);
udelay(16);
for (l = 25; l > 0; l--) {
data = (val >> 24) & TEA575X_DATA;
val <<= 1; /* shift data */
tea->ops->set_pins(tea, data | TEA575X_WREN);
udelay(2);
tea->ops->set_pins(tea, data | TEA575X_WREN | TEA575X_CLK);
udelay(2);
tea->ops->set_pins(tea, data | TEA575X_WREN);
udelay(2);
}
if (!tea->mute)
tea->ops->set_pins(tea, 0);
}
static u32 snd_tea575x_read(struct snd_tea575x *tea)
{
u16 l, rdata;
u32 data = 0;
if (tea->ops->read_val)
return tea->ops->read_val(tea);
tea->ops->set_direction(tea, 0);
tea->ops->set_pins(tea, 0);
udelay(16);
for (l = 24; l--;) {
tea->ops->set_pins(tea, TEA575X_CLK);
udelay(2);
if (!l)
tea->tuned = tea->ops->get_pins(tea) & TEA575X_MOST ? 0 : 1;
tea->ops->set_pins(tea, 0);
udelay(2);
data <<= 1; /* shift data */
rdata = tea->ops->get_pins(tea);
if (!l)
tea->stereo = (rdata & TEA575X_MOST) ? 0 : 1;
if (rdata & TEA575X_DATA)
data++;
udelay(2);
}
if (tea->mute)
tea->ops->set_pins(tea, TEA575X_WREN);
return data;
}
static u32 snd_tea575x_val_to_freq(struct snd_tea575x *tea, u32 val)
{
u32 freq = val & TEA575X_BIT_FREQ_MASK;
if (freq == 0)
return freq;
switch (tea->band) {
case BAND_FM:
/* freq *= 12.5 */
freq *= 125;
freq /= 10;
/* crystal fixup */
freq -= TEA575X_FMIF;
break;
case BAND_FM_JAPAN:
/* freq *= 12.5 */
freq *= 125;
freq /= 10;
/* crystal fixup */
freq += TEA575X_FMIF;
break;
case BAND_AM:
/* crystal fixup */
freq -= TEA575X_AMIF;
break;
}
return clamp(freq * 16, bands[tea->band].rangelow,
bands[tea->band].rangehigh); /* from kHz */
}
static u32 snd_tea575x_get_freq(struct snd_tea575x *tea)
{
return snd_tea575x_val_to_freq(tea, snd_tea575x_read(tea));
}
void snd_tea575x_set_freq(struct snd_tea575x *tea)
{
u32 freq = tea->freq / 16; /* to kHz */
u32 band = 0;
switch (tea->band) {
case BAND_FM:
band = TEA575X_BIT_BAND_FM;
/* crystal fixup */
freq += TEA575X_FMIF;
/* freq /= 12.5 */
freq *= 10;
freq /= 125;
break;
case BAND_FM_JAPAN:
band = TEA575X_BIT_BAND_FM;
/* crystal fixup */
freq -= TEA575X_FMIF;
/* freq /= 12.5 */
freq *= 10;
freq /= 125;
break;
case BAND_AM:
band = TEA575X_BIT_BAND_MW;
/* crystal fixup */
freq += TEA575X_AMIF;
break;
}
tea->val &= ~(TEA575X_BIT_FREQ_MASK | TEA575X_BIT_BAND_MASK);
tea->val |= band;
tea->val |= freq & TEA575X_BIT_FREQ_MASK;
snd_tea575x_write(tea, tea->val);
tea->freq = snd_tea575x_val_to_freq(tea, tea->val);
}
/*
* Linux Video interface
*/
static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *v)
{
struct snd_tea575x *tea = video_drvdata(file);
strlcpy(v->driver, tea->v4l2_dev->name, sizeof(v->driver));
strlcpy(v->card, tea->card, sizeof(v->card));
strlcat(v->card, tea->tea5759 ? " TEA5759" : " TEA5757", sizeof(v->card));
strlcpy(v->bus_info, tea->bus_info, sizeof(v->bus_info));
v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
if (!tea->cannot_read_data)
v->device_caps |= V4L2_CAP_HW_FREQ_SEEK;
v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
return 0;
}
int snd_tea575x_enum_freq_bands(struct snd_tea575x *tea,
struct v4l2_frequency_band *band)
{
int index;
if (band->tuner != 0)
return -EINVAL;
switch (band->index) {
case 0:
if (tea->tea5759)
index = BAND_FM_JAPAN;
else
index = BAND_FM;
break;
case 1:
if (tea->has_am) {
index = BAND_AM;
break;
}
/* Fall through */
default:
return -EINVAL;
}
*band = bands[index];
if (!tea->cannot_read_data)
band->capability |= V4L2_TUNER_CAP_HWSEEK_BOUNDED;
return 0;
}
EXPORT_SYMBOL(snd_tea575x_enum_freq_bands);
static int vidioc_enum_freq_bands(struct file *file, void *priv,
struct v4l2_frequency_band *band)
{
struct snd_tea575x *tea = video_drvdata(file);
return snd_tea575x_enum_freq_bands(tea, band);
}
int snd_tea575x_g_tuner(struct snd_tea575x *tea, struct v4l2_tuner *v)
{
struct v4l2_frequency_band band_fm = { 0, };
if (v->index > 0)
return -EINVAL;
snd_tea575x_read(tea);
snd_tea575x_enum_freq_bands(tea, &band_fm);
memset(v, 0, sizeof(*v));
strlcpy(v->name, tea->has_am ? "FM/AM" : "FM", sizeof(v->name));
v->type = V4L2_TUNER_RADIO;
v->capability = band_fm.capability;
v->rangelow = tea->has_am ? bands[BAND_AM].rangelow : band_fm.rangelow;
v->rangehigh = band_fm.rangehigh;
v->rxsubchans = tea->stereo ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
v->audmode = (tea->val & TEA575X_BIT_MONO) ?
V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO;
v->signal = tea->tuned ? 0xffff : 0;
return 0;
}
EXPORT_SYMBOL(snd_tea575x_g_tuner);
static int vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct snd_tea575x *tea = video_drvdata(file);
return snd_tea575x_g_tuner(tea, v);
}
static int vidioc_s_tuner(struct file *file, void *priv,
const struct v4l2_tuner *v)
{
struct snd_tea575x *tea = video_drvdata(file);
u32 orig_val = tea->val;
if (v->index)
return -EINVAL;
tea->val &= ~TEA575X_BIT_MONO;
if (v->audmode == V4L2_TUNER_MODE_MONO)
tea->val |= TEA575X_BIT_MONO;
/* Only apply changes if currently tuning FM */
if (tea->band != BAND_AM && tea->val != orig_val)
snd_tea575x_set_freq(tea);
return 0;
}
static int vidioc_g_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct snd_tea575x *tea = video_drvdata(file);
if (f->tuner != 0)
return -EINVAL;
f->type = V4L2_TUNER_RADIO;
f->frequency = tea->freq;
return 0;
}
static int vidioc_s_frequency(struct file *file, void *priv,
const struct v4l2_frequency *f)
{
struct snd_tea575x *tea = video_drvdata(file);
if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
return -EINVAL;
if (tea->has_am && f->frequency < (20000 * 16))
tea->band = BAND_AM;
else if (tea->tea5759)
tea->band = BAND_FM_JAPAN;
else
tea->band = BAND_FM;
tea->freq = clamp_t(u32, f->frequency, bands[tea->band].rangelow,
bands[tea->band].rangehigh);
snd_tea575x_set_freq(tea);
return 0;
}
int snd_tea575x_s_hw_freq_seek(struct file *file, struct snd_tea575x *tea,
const struct v4l2_hw_freq_seek *a)
{
unsigned long timeout;
int i, spacing;
if (tea->cannot_read_data)
return -ENOTTY;
if (a->tuner || a->wrap_around)
return -EINVAL;
if (file->f_flags & O_NONBLOCK)
return -EWOULDBLOCK;
if (a->rangelow || a->rangehigh) {
for (i = 0; i < ARRAY_SIZE(bands); i++) {
if ((i == BAND_FM && tea->tea5759) ||
(i == BAND_FM_JAPAN && !tea->tea5759) ||
(i == BAND_AM && !tea->has_am))
continue;
if (bands[i].rangelow == a->rangelow &&
bands[i].rangehigh == a->rangehigh)
break;
}
if (i == ARRAY_SIZE(bands))
return -EINVAL; /* No matching band found */
if (i != tea->band) {
tea->band = i;
tea->freq = clamp(tea->freq, bands[i].rangelow,
bands[i].rangehigh);
snd_tea575x_set_freq(tea);
}
}
spacing = (tea->band == BAND_AM) ? 5 : 50; /* kHz */
/* clear the frequency, HW will fill it in */
tea->val &= ~TEA575X_BIT_FREQ_MASK;
tea->val |= TEA575X_BIT_SEARCH;
if (a->seek_upward)
tea->val |= TEA575X_BIT_UPDOWN;
else
tea->val &= ~TEA575X_BIT_UPDOWN;
snd_tea575x_write(tea, tea->val);
timeout = jiffies + msecs_to_jiffies(10000);
for (;;) {
if (time_after(jiffies, timeout))
break;
if (schedule_timeout_interruptible(msecs_to_jiffies(10))) {
/* some signal arrived, stop search */
tea->val &= ~TEA575X_BIT_SEARCH;
snd_tea575x_set_freq(tea);
return -ERESTARTSYS;
}
if (!(snd_tea575x_read(tea) & TEA575X_BIT_SEARCH)) {
u32 freq;
/* Found a frequency, wait until it can be read */
for (i = 0; i < 100; i++) {
msleep(10);
freq = snd_tea575x_get_freq(tea);
if (freq) /* available */
break;
}
if (freq == 0) /* shouldn't happen */
break;
/*
* if we moved by less than the spacing, or in the
* wrong direction, continue seeking
*/
if (abs(tea->freq - freq) < 16 * spacing ||
(a->seek_upward && freq < tea->freq) ||
(!a->seek_upward && freq > tea->freq)) {
snd_tea575x_write(tea, tea->val);
continue;
}
tea->freq = freq;
tea->val &= ~TEA575X_BIT_SEARCH;
return 0;
}
}
tea->val &= ~TEA575X_BIT_SEARCH;
snd_tea575x_set_freq(tea);
return -ENODATA;
}
EXPORT_SYMBOL(snd_tea575x_s_hw_freq_seek);
static int vidioc_s_hw_freq_seek(struct file *file, void *fh,
const struct v4l2_hw_freq_seek *a)
{
struct snd_tea575x *tea = video_drvdata(file);
return snd_tea575x_s_hw_freq_seek(file, tea, a);
}
static int tea575x_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler);
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
tea->mute = ctrl->val;
snd_tea575x_set_freq(tea);
return 0;
}
return -EINVAL;
}
static const struct v4l2_file_operations tea575x_fops = {
.unlocked_ioctl = video_ioctl2,
.open = v4l2_fh_open,
.release = v4l2_fh_release,
.poll = v4l2_ctrl_poll,
};
static const struct v4l2_ioctl_ops tea575x_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_s_hw_freq_seek = vidioc_s_hw_freq_seek,
.vidioc_enum_freq_bands = vidioc_enum_freq_bands,
.vidioc_log_status = v4l2_ctrl_log_status,
.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};
static const struct video_device tea575x_radio = {
.ioctl_ops = &tea575x_ioctl_ops,
.release = video_device_release_empty,
};
static const struct v4l2_ctrl_ops tea575x_ctrl_ops = {
.s_ctrl = tea575x_s_ctrl,
};
int snd_tea575x_hw_init(struct snd_tea575x *tea)
{
tea->mute = true;
/* Not all devices can or know how to read the data back.
Such devices can set cannot_read_data to true. */
if (!tea->cannot_read_data) {
snd_tea575x_write(tea, 0x55AA);
if (snd_tea575x_read(tea) != 0x55AA)
return -ENODEV;
}
tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_5_28;
tea->freq = 90500 * 16; /* 90.5Mhz default */
snd_tea575x_set_freq(tea);
return 0;
}
EXPORT_SYMBOL(snd_tea575x_hw_init);
int snd_tea575x_init(struct snd_tea575x *tea, struct module *owner)
{
int retval = snd_tea575x_hw_init(tea);
if (retval)
return retval;
tea->vd = tea575x_radio;
video_set_drvdata(&tea->vd, tea);
mutex_init(&tea->mutex);
strlcpy(tea->vd.name, tea->v4l2_dev->name, sizeof(tea->vd.name));
tea->vd.lock = &tea->mutex;
tea->vd.v4l2_dev = tea->v4l2_dev;
tea->fops = tea575x_fops;
tea->fops.owner = owner;
tea->vd.fops = &tea->fops;
/* disable hw_freq_seek if we can't use it */
if (tea->cannot_read_data)
v4l2_disable_ioctl(&tea->vd, VIDIOC_S_HW_FREQ_SEEK);
if (!tea->cannot_mute) {
tea->vd.ctrl_handler = &tea->ctrl_handler;
v4l2_ctrl_handler_init(&tea->ctrl_handler, 1);
v4l2_ctrl_new_std(&tea->ctrl_handler, &tea575x_ctrl_ops,
V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
retval = tea->ctrl_handler.error;
if (retval) {
v4l2_err(tea->v4l2_dev, "can't initialize controls\n");
v4l2_ctrl_handler_free(&tea->ctrl_handler);
return retval;
}
if (tea->ext_init) {
retval = tea->ext_init(tea);
if (retval) {
v4l2_ctrl_handler_free(&tea->ctrl_handler);
return retval;
}
}
v4l2_ctrl_handler_setup(&tea->ctrl_handler);
}
retval = video_register_device(&tea->vd, VFL_TYPE_RADIO, tea->radio_nr);
if (retval) {
v4l2_err(tea->v4l2_dev, "can't register video device!\n");
v4l2_ctrl_handler_free(tea->vd.ctrl_handler);
return retval;
}
return 0;
}
void snd_tea575x_exit(struct snd_tea575x *tea)
{
video_unregister_device(&tea->vd);
v4l2_ctrl_handler_free(tea->vd.ctrl_handler);
}
static int __init alsa_tea575x_module_init(void)
{
return 0;
}
static void __exit alsa_tea575x_module_exit(void)
{
}
module_init(alsa_tea575x_module_init)
module_exit(alsa_tea575x_module_exit)
EXPORT_SYMBOL(snd_tea575x_init);
EXPORT_SYMBOL(snd_tea575x_exit);
EXPORT_SYMBOL(snd_tea575x_set_freq);
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