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kernel/drivers/media/radio/radio-miropcm20.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Miro PCM20 radio driver for Linux radio support
* (c) 1998 Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl>
* Thanks to Norberto Pellici for the ACI device interface specification
* The API part is based on the radiotrack driver by M. Kirkwood
* This driver relies on the aci mixer provided by the snd-miro
* ALSA driver.
* Look there for further info...
*
* From the original miro RDS sources:
*
* (c) 2001 Robert Siemer <Robert.Siemer@gmx.de>
*
* Many thanks to Fred Seidel <seidel@metabox.de>, the
* designer of the RDS decoder hardware. With his help
* I was able to code this driver.
* Thanks also to Norberto Pellicci, Dominic Mounteney
* <DMounteney@pinnaclesys.com> and www.teleauskunft.de
* for good hints on finding Fred. It was somewhat hard
* to locate him here in Germany... [:
*
* This code has been reintroduced and converted to use
* the new V4L2 RDS API by:
*
* Hans Verkuil <hans.verkuil@cisco.com>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/videodev2.h>
#include <linux/kthread.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-event.h>
#include <sound/aci.h>
#define RDS_DATASHIFT 2 /* Bit 2 */
#define RDS_DATAMASK (1 << RDS_DATASHIFT)
#define RDS_BUSYMASK 0x10 /* Bit 4 */
#define RDS_CLOCKMASK 0x08 /* Bit 3 */
#define RDS_DATA(x) (((x) >> RDS_DATASHIFT) & 1)
#define RDS_STATUS 0x01
#define RDS_STATIONNAME 0x02
#define RDS_TEXT 0x03
#define RDS_ALTFREQ 0x04
#define RDS_TIMEDATE 0x05
#define RDS_PI_CODE 0x06
#define RDS_PTYTATP 0x07
#define RDS_RESET 0x08
#define RDS_RXVALUE 0x09
static int radio_nr = -1;
module_param(radio_nr, int, 0);
MODULE_PARM_DESC(radio_nr, "Set radio device number (/dev/radioX). Default: -1 (autodetect)");
struct pcm20 {
struct v4l2_device v4l2_dev;
struct video_device vdev;
struct v4l2_ctrl_handler ctrl_handler;
struct v4l2_ctrl *rds_pty;
struct v4l2_ctrl *rds_ps_name;
struct v4l2_ctrl *rds_radio_test;
struct v4l2_ctrl *rds_ta;
struct v4l2_ctrl *rds_tp;
struct v4l2_ctrl *rds_ms;
/* thread for periodic RDS status checking */
struct task_struct *kthread;
unsigned long freq;
u32 audmode;
struct snd_miro_aci *aci;
struct mutex lock;
};
static struct pcm20 pcm20_card = {
.freq = 87 * 16000,
.audmode = V4L2_TUNER_MODE_STEREO,
};
static int rds_waitread(struct snd_miro_aci *aci)
{
u8 byte;
int i = 2000;
do {
byte = inb(aci->aci_port + ACI_REG_RDS);
i--;
} while ((byte & RDS_BUSYMASK) && i);
/*
* It's magic, but without this the data that you read later on
* is unreliable and full of bit errors. With this 1 usec delay
* everything is fine.
*/
udelay(1);
return i ? byte : -1;
}
static int rds_rawwrite(struct snd_miro_aci *aci, u8 byte)
{
if (rds_waitread(aci) >= 0) {
outb(byte, aci->aci_port + ACI_REG_RDS);
return 0;
}
return -1;
}
static int rds_write(struct snd_miro_aci *aci, u8 byte)
{
u8 sendbuffer[8];
int i;
for (i = 7; i >= 0; i--)
sendbuffer[7 - i] = (byte & (1 << i)) ? RDS_DATAMASK : 0;
sendbuffer[0] |= RDS_CLOCKMASK;
for (i = 0; i < 8; i++)
rds_rawwrite(aci, sendbuffer[i]);
return 0;
}
static int rds_readcycle_nowait(struct snd_miro_aci *aci)
{
outb(0, aci->aci_port + ACI_REG_RDS);
return rds_waitread(aci);
}
static int rds_readcycle(struct snd_miro_aci *aci)
{
if (rds_rawwrite(aci, 0) < 0)
return -1;
return rds_waitread(aci);
}
static int rds_ack(struct snd_miro_aci *aci)
{
int i = rds_readcycle(aci);
if (i < 0)
return -1;
if (i & RDS_DATAMASK)
return 0; /* ACK */
return 1; /* NACK */
}
static int rds_cmd(struct snd_miro_aci *aci, u8 cmd, u8 databuffer[], u8 datasize)
{
int i, j;
rds_write(aci, cmd);
/* RDS_RESET doesn't need further processing */
if (cmd == RDS_RESET)
return 0;
if (rds_ack(aci))
return -EIO;
if (datasize == 0)
return 0;
/* to be able to use rds_readcycle_nowait()
I have to waitread() here */
if (rds_waitread(aci) < 0)
return -1;
memset(databuffer, 0, datasize);
for (i = 0; i < 8 * datasize; i++) {
j = rds_readcycle_nowait(aci);
if (j < 0)
return -EIO;
databuffer[i / 8] |= RDS_DATA(j) << (7 - (i % 8));
}
return 0;
}
static int pcm20_setfreq(struct pcm20 *dev, unsigned long freq)
{
unsigned char freql;
unsigned char freqh;
struct snd_miro_aci *aci = dev->aci;
freq /= 160;
if (!(aci->aci_version == 0x07 || aci->aci_version >= 0xb0))
freq /= 10; /* I don't know exactly which version
* needs this hack */
freql = freq & 0xff;
freqh = freq >> 8;
rds_cmd(aci, RDS_RESET, NULL, 0);
return snd_aci_cmd(aci, ACI_WRITE_TUNE, freql, freqh);
}
static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *v)
{
strscpy(v->driver, "Miro PCM20", sizeof(v->driver));
strscpy(v->card, "Miro PCM20", sizeof(v->card));
strscpy(v->bus_info, "ISA:radio-miropcm20", sizeof(v->bus_info));
return 0;
}
static bool sanitize(char *p, int size)
{
int i;
bool ret = true;
for (i = 0; i < size; i++) {
if (p[i] < 32) {
p[i] = ' ';
ret = false;
}
}
return ret;
}
static int vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct pcm20 *dev = video_drvdata(file);
int res;
u8 buf;
if (v->index)
return -EINVAL;
strscpy(v->name, "FM", sizeof(v->name));
v->type = V4L2_TUNER_RADIO;
v->rangelow = 87*16000;
v->rangehigh = 108*16000;
res = snd_aci_cmd(dev->aci, ACI_READ_TUNERSTATION, -1, -1);
v->signal = (res & 0x80) ? 0 : 0xffff;
/* Note: stereo detection does not work if the audio is muted,
it will default to mono in that case. */
res = snd_aci_cmd(dev->aci, ACI_READ_TUNERSTEREO, -1, -1);
v->rxsubchans = (res & 0x40) ? V4L2_TUNER_SUB_MONO :
V4L2_TUNER_SUB_STEREO;
v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_CONTROLS;
v->audmode = dev->audmode;
res = rds_cmd(dev->aci, RDS_RXVALUE, &buf, 1);
if (res >= 0 && buf)
v->rxsubchans |= V4L2_TUNER_SUB_RDS;
return 0;
}
static int vidioc_s_tuner(struct file *file, void *priv,
const struct v4l2_tuner *v)
{
struct pcm20 *dev = video_drvdata(file);
if (v->index)
return -EINVAL;
if (v->audmode > V4L2_TUNER_MODE_STEREO)
dev->audmode = V4L2_TUNER_MODE_STEREO;
else
dev->audmode = v->audmode;
snd_aci_cmd(dev->aci, ACI_SET_TUNERMONO,
dev->audmode == V4L2_TUNER_MODE_MONO, -1);
return 0;
}
static int vidioc_g_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct pcm20 *dev = video_drvdata(file);
if (f->tuner != 0)
return -EINVAL;
f->type = V4L2_TUNER_RADIO;
f->frequency = dev->freq;
return 0;
}
static int vidioc_s_frequency(struct file *file, void *priv,
const struct v4l2_frequency *f)
{
struct pcm20 *dev = video_drvdata(file);
if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
return -EINVAL;
dev->freq = clamp_t(u32, f->frequency, 87 * 16000U, 108 * 16000U);
pcm20_setfreq(dev, dev->freq);
return 0;
}
static int pcm20_s_ctrl(struct v4l2_ctrl *ctrl)
{
struct pcm20 *dev = container_of(ctrl->handler, struct pcm20, ctrl_handler);
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
snd_aci_cmd(dev->aci, ACI_SET_TUNERMUTE, ctrl->val, -1);
return 0;
}
return -EINVAL;
}
static int pcm20_thread(void *data)
{
struct pcm20 *dev = data;
const unsigned no_rds_start_counter = 5;
const unsigned sleep_msecs = 2000;
unsigned no_rds_counter = no_rds_start_counter;
for (;;) {
char text_buffer[66];
u8 buf;
int res;
msleep_interruptible(sleep_msecs);
if (kthread_should_stop())
break;
res = rds_cmd(dev->aci, RDS_RXVALUE, &buf, 1);
if (res)
continue;
if (buf == 0) {
if (no_rds_counter == 0)
continue;
no_rds_counter--;
if (no_rds_counter)
continue;
/*
* No RDS seen for no_rds_start_counter * sleep_msecs
* milliseconds, clear all RDS controls to their
* default values.
*/
v4l2_ctrl_s_ctrl_string(dev->rds_ps_name, "");
v4l2_ctrl_s_ctrl(dev->rds_ms, 1);
v4l2_ctrl_s_ctrl(dev->rds_ta, 0);
v4l2_ctrl_s_ctrl(dev->rds_tp, 0);
v4l2_ctrl_s_ctrl(dev->rds_pty, 0);
v4l2_ctrl_s_ctrl_string(dev->rds_radio_test, "");
continue;
}
no_rds_counter = no_rds_start_counter;
res = rds_cmd(dev->aci, RDS_STATUS, &buf, 1);
if (res)
continue;
if ((buf >> 3) & 1) {
res = rds_cmd(dev->aci, RDS_STATIONNAME, text_buffer, 8);
text_buffer[8] = 0;
if (!res && sanitize(text_buffer, 8))
v4l2_ctrl_s_ctrl_string(dev->rds_ps_name, text_buffer);
}
if ((buf >> 6) & 1) {
u8 pty;
res = rds_cmd(dev->aci, RDS_PTYTATP, &pty, 1);
if (!res) {
v4l2_ctrl_s_ctrl(dev->rds_ms, !!(pty & 0x01));
v4l2_ctrl_s_ctrl(dev->rds_ta, !!(pty & 0x02));
v4l2_ctrl_s_ctrl(dev->rds_tp, !!(pty & 0x80));
v4l2_ctrl_s_ctrl(dev->rds_pty, (pty >> 2) & 0x1f);
}
}
if ((buf >> 4) & 1) {
res = rds_cmd(dev->aci, RDS_TEXT, text_buffer, 65);
text_buffer[65] = 0;
if (!res && sanitize(text_buffer + 1, 64))
v4l2_ctrl_s_ctrl_string(dev->rds_radio_test, text_buffer + 1);
}
}
return 0;
}
static int pcm20_open(struct file *file)
{
struct pcm20 *dev = video_drvdata(file);
int res = v4l2_fh_open(file);
if (!res && v4l2_fh_is_singular_file(file) &&
IS_ERR_OR_NULL(dev->kthread)) {
dev->kthread = kthread_run(pcm20_thread, dev, "%s",
dev->v4l2_dev.name);
if (IS_ERR(dev->kthread)) {
v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
v4l2_fh_release(file);
return PTR_ERR(dev->kthread);
}
}
return res;
}
static int pcm20_release(struct file *file)
{
struct pcm20 *dev = video_drvdata(file);
if (v4l2_fh_is_singular_file(file) && !IS_ERR_OR_NULL(dev->kthread)) {
kthread_stop(dev->kthread);
dev->kthread = NULL;
}
return v4l2_fh_release(file);
}
static const struct v4l2_file_operations pcm20_fops = {
.owner = THIS_MODULE,
.open = pcm20_open,
.poll = v4l2_ctrl_poll,
.release = pcm20_release,
.unlocked_ioctl = video_ioctl2,
};
static const struct v4l2_ioctl_ops pcm20_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,
};
static const struct v4l2_ctrl_ops pcm20_ctrl_ops = {
.s_ctrl = pcm20_s_ctrl,
};
static int __init pcm20_init(void)
{
struct pcm20 *dev = &pcm20_card;
struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
struct v4l2_ctrl_handler *hdl;
int res;
dev->aci = snd_aci_get_aci();
if (dev->aci == NULL) {
v4l2_err(v4l2_dev,
"you must load the snd-miro driver first!\n");
return -ENODEV;
}
strscpy(v4l2_dev->name, "radio-miropcm20", sizeof(v4l2_dev->name));
mutex_init(&dev->lock);
res = v4l2_device_register(NULL, v4l2_dev);
if (res < 0) {
v4l2_err(v4l2_dev, "could not register v4l2_device\n");
return -EINVAL;
}
hdl = &dev->ctrl_handler;
v4l2_ctrl_handler_init(hdl, 7);
v4l2_ctrl_new_std(hdl, &pcm20_ctrl_ops,
V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
dev->rds_pty = v4l2_ctrl_new_std(hdl, NULL,
V4L2_CID_RDS_RX_PTY, 0, 0x1f, 1, 0);
dev->rds_ps_name = v4l2_ctrl_new_std(hdl, NULL,
V4L2_CID_RDS_RX_PS_NAME, 0, 8, 8, 0);
dev->rds_radio_test = v4l2_ctrl_new_std(hdl, NULL,
V4L2_CID_RDS_RX_RADIO_TEXT, 0, 64, 64, 0);
dev->rds_ta = v4l2_ctrl_new_std(hdl, NULL,
V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT, 0, 1, 1, 0);
dev->rds_tp = v4l2_ctrl_new_std(hdl, NULL,
V4L2_CID_RDS_RX_TRAFFIC_PROGRAM, 0, 1, 1, 0);
dev->rds_ms = v4l2_ctrl_new_std(hdl, NULL,
V4L2_CID_RDS_RX_MUSIC_SPEECH, 0, 1, 1, 1);
v4l2_dev->ctrl_handler = hdl;
if (hdl->error) {
res = hdl->error;
v4l2_err(v4l2_dev, "Could not register control\n");
goto err_hdl;
}
strscpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
dev->vdev.v4l2_dev = v4l2_dev;
dev->vdev.fops = &pcm20_fops;
dev->vdev.ioctl_ops = &pcm20_ioctl_ops;
dev->vdev.release = video_device_release_empty;
dev->vdev.lock = &dev->lock;
dev->vdev.device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO |
V4L2_CAP_RDS_CAPTURE;
video_set_drvdata(&dev->vdev, dev);
snd_aci_cmd(dev->aci, ACI_SET_TUNERMONO,
dev->audmode == V4L2_TUNER_MODE_MONO, -1);
pcm20_setfreq(dev, dev->freq);
if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0)
goto err_hdl;
v4l2_info(v4l2_dev, "Mirosound PCM20 Radio tuner\n");
return 0;
err_hdl:
v4l2_ctrl_handler_free(hdl);
v4l2_device_unregister(v4l2_dev);
return -EINVAL;
}
MODULE_AUTHOR("Ruurd Reitsma, Krzysztof Helt");
MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card.");
MODULE_LICENSE("GPL");
static void __exit pcm20_cleanup(void)
{
struct pcm20 *dev = &pcm20_card;
video_unregister_device(&dev->vdev);
snd_aci_cmd(dev->aci, ACI_SET_TUNERMUTE, 1, -1);
v4l2_ctrl_handler_free(&dev->ctrl_handler);
v4l2_device_unregister(&dev->v4l2_dev);
}
module_init(pcm20_init);
module_exit(pcm20_cleanup);
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