[media] radio-miropcm20: add RDS support
Once upon a time the radio-miropcm20 driver had RDS support. However, after some internal kernel changes that support was removed. Now that we have a nice RDS API I have been working on adding back this support. It has been tested with the si4713 RDS transmitter and it is working quite nicely. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Hans Verkuil
Mauro Carvalho Chehab
parent
1a586e1a5b
commit
fdcfd4e704
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@ -1,20 +1,35 @@
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/* Miro PCM20 radio driver for Linux radio support
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/*
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* Miro PCM20 radio driver for Linux radio support
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* (c) 1998 Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl>
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* Thanks to Norberto Pellici for the ACI device interface specification
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* The API part is based on the radiotrack driver by M. Kirkwood
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* This driver relies on the aci mixer provided by the snd-miro
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* ALSA driver.
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* Look there for further info...
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*/
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/* What ever you think about the ACI, version 0x07 is not very well!
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* I can't get frequency, 'tuner status', 'tuner flags' or mute/mono
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* conditions... Robert
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*
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* From the original miro RDS sources:
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*
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* (c) 2001 Robert Siemer <Robert.Siemer@gmx.de>
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*
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* Many thanks to Fred Seidel <seidel@metabox.de>, the
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* designer of the RDS decoder hardware. With his help
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* I was able to code this driver.
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* Thanks also to Norberto Pellicci, Dominic Mounteney
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* <DMounteney@pinnaclesys.com> and www.teleauskunft.de
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* for good hints on finding Fred. It was somewhat hard
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* to locate him here in Germany... [:
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*
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* This code has been reintroduced and converted to use
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* the new V4L2 RDS API by:
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*
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* Hans Verkuil <hans.verkuil@cisco.com>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/videodev2.h>
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#include <linux/kthread.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-ctrls.h>
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@ -22,6 +37,22 @@
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#include <media/v4l2-event.h>
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#include <sound/aci.h>
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#define RDS_DATASHIFT 2 /* Bit 2 */
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#define RDS_DATAMASK (1 << RDS_DATASHIFT)
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#define RDS_BUSYMASK 0x10 /* Bit 4 */
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#define RDS_CLOCKMASK 0x08 /* Bit 3 */
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#define RDS_DATA(x) (((x) >> RDS_DATASHIFT) & 1)
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#define RDS_STATUS 0x01
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#define RDS_STATIONNAME 0x02
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#define RDS_TEXT 0x03
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#define RDS_ALTFREQ 0x04
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#define RDS_TIMEDATE 0x05
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#define RDS_PI_CODE 0x06
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#define RDS_PTYTATP 0x07
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#define RDS_RESET 0x08
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#define RDS_RXVALUE 0x09
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static int radio_nr = -1;
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module_param(radio_nr, int, 0);
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MODULE_PARM_DESC(radio_nr, "Set radio device number (/dev/radioX). Default: -1 (autodetect)");
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@ -30,6 +61,14 @@ struct pcm20 {
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struct v4l2_device v4l2_dev;
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struct video_device vdev;
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struct v4l2_ctrl_handler ctrl_handler;
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struct v4l2_ctrl *rds_pty;
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struct v4l2_ctrl *rds_ps_name;
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struct v4l2_ctrl *rds_radio_test;
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struct v4l2_ctrl *rds_ta;
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struct v4l2_ctrl *rds_tp;
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struct v4l2_ctrl *rds_ms;
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/* thread for periodic RDS status checking */
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struct task_struct *kthread;
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unsigned long freq;
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u32 audmode;
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struct snd_miro_aci *aci;
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@ -41,6 +80,103 @@ static struct pcm20 pcm20_card = {
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.audmode = V4L2_TUNER_MODE_STEREO,
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};
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static int rds_waitread(struct snd_miro_aci *aci)
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{
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u8 byte;
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int i = 2000;
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do {
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byte = inb(aci->aci_port + ACI_REG_RDS);
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i--;
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} while ((byte & RDS_BUSYMASK) && i);
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/*
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* It's magic, but without this the data that you read later on
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* is unreliable and full of bit errors. With this 1 usec delay
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* everything is fine.
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*/
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udelay(1);
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return i ? byte : -1;
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}
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static int rds_rawwrite(struct snd_miro_aci *aci, u8 byte)
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{
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if (rds_waitread(aci) >= 0) {
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outb(byte, aci->aci_port + ACI_REG_RDS);
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return 0;
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}
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return -1;
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}
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static int rds_write(struct snd_miro_aci *aci, u8 byte)
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{
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u8 sendbuffer[8];
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int i;
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for (i = 7; i >= 0; i--)
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sendbuffer[7 - i] = (byte & (1 << i)) ? RDS_DATAMASK : 0;
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sendbuffer[0] |= RDS_CLOCKMASK;
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for (i = 0; i < 8; i++)
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rds_rawwrite(aci, sendbuffer[i]);
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return 0;
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}
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static int rds_readcycle_nowait(struct snd_miro_aci *aci)
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{
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outb(0, aci->aci_port + ACI_REG_RDS);
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return rds_waitread(aci);
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}
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static int rds_readcycle(struct snd_miro_aci *aci)
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{
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if (rds_rawwrite(aci, 0) < 0)
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return -1;
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return rds_waitread(aci);
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}
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static int rds_ack(struct snd_miro_aci *aci)
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{
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int i = rds_readcycle(aci);
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if (i < 0)
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return -1;
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if (i & RDS_DATAMASK)
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return 0; /* ACK */
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return 1; /* NACK */
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}
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static int rds_cmd(struct snd_miro_aci *aci, u8 cmd, u8 databuffer[], u8 datasize)
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{
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int i, j;
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rds_write(aci, cmd);
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/* RDS_RESET doesn't need further processing */
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if (cmd == RDS_RESET)
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return 0;
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if (rds_ack(aci))
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return -EIO;
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if (datasize == 0)
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return 0;
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/* to be able to use rds_readcycle_nowait()
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I have to waitread() here */
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if (rds_waitread(aci) < 0)
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return -1;
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memset(databuffer, 0, datasize);
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for (i = 0; i < 8 * datasize; i++) {
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j = rds_readcycle_nowait(aci);
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if (j < 0)
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return -EIO;
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databuffer[i / 8] |= RDS_DATA(j) << (7 - (i % 8));
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}
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return 0;
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}
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static int pcm20_setfreq(struct pcm20 *dev, unsigned long freq)
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{
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unsigned char freql;
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@ -54,17 +190,10 @@ static int pcm20_setfreq(struct pcm20 *dev, unsigned long freq)
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freql = freq & 0xff;
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freqh = freq >> 8;
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rds_cmd(aci, RDS_RESET, 0, 0);
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return snd_aci_cmd(aci, ACI_WRITE_TUNE, freql, freqh);
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}
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static const struct v4l2_file_operations pcm20_fops = {
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.owner = THIS_MODULE,
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.open = v4l2_fh_open,
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.poll = v4l2_ctrl_poll,
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.release = v4l2_fh_release,
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.unlocked_ioctl = video_ioctl2,
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};
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static int vidioc_querycap(struct file *file, void *priv,
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struct v4l2_capability *v)
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{
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@ -73,16 +202,31 @@ static int vidioc_querycap(struct file *file, void *priv,
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strlcpy(v->driver, "Miro PCM20", sizeof(v->driver));
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strlcpy(v->card, "Miro PCM20", sizeof(v->card));
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snprintf(v->bus_info, sizeof(v->bus_info), "ISA:%s", dev->v4l2_dev.name);
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v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
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v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
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v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
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return 0;
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}
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static bool sanitize(char *p, int size)
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{
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int i;
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bool ret = true;
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for (i = 0; i < size; i++) {
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if (p[i] < 32 || p[i] >= 128) {
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p[i] = ' ';
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ret = false;
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}
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}
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return ret;
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}
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static int vidioc_g_tuner(struct file *file, void *priv,
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struct v4l2_tuner *v)
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{
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struct pcm20 *dev = video_drvdata(file);
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int res;
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u8 buf;
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if (v->index)
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return -EINVAL;
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@ -97,8 +241,12 @@ static int vidioc_g_tuner(struct file *file, void *priv,
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res = snd_aci_cmd(dev->aci, ACI_READ_TUNERSTEREO, -1, -1);
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v->rxsubchans = (res & 0x40) ? V4L2_TUNER_SUB_MONO :
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V4L2_TUNER_SUB_STEREO;
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v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
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v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
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V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_CONTROLS;
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v->audmode = dev->audmode;
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res = rds_cmd(dev->aci, RDS_RXVALUE, &buf, 1);
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if (res >= 0 && buf)
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v->rxsubchans |= V4L2_TUNER_SUB_RDS;
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return 0;
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}
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@ -157,6 +305,115 @@ static int pcm20_s_ctrl(struct v4l2_ctrl *ctrl)
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return -EINVAL;
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}
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static int pcm20_thread(void *data)
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{
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struct pcm20 *dev = data;
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const unsigned no_rds_start_counter = 5;
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const unsigned sleep_msecs = 2000;
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unsigned no_rds_counter = no_rds_start_counter;
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for (;;) {
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char text_buffer[66];
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u8 buf;
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int res;
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msleep_interruptible(sleep_msecs);
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if (kthread_should_stop())
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break;
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res = rds_cmd(dev->aci, RDS_RXVALUE, &buf, 1);
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if (res)
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continue;
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if (buf == 0) {
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if (no_rds_counter == 0)
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continue;
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no_rds_counter--;
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if (no_rds_counter)
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continue;
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/*
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* No RDS seen for no_rds_start_counter * sleep_msecs
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* milliseconds, clear all RDS controls to their
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* default values.
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*/
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v4l2_ctrl_s_ctrl_string(dev->rds_ps_name, "");
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v4l2_ctrl_s_ctrl(dev->rds_ms, 1);
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v4l2_ctrl_s_ctrl(dev->rds_ta, 0);
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v4l2_ctrl_s_ctrl(dev->rds_tp, 0);
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v4l2_ctrl_s_ctrl(dev->rds_pty, 0);
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v4l2_ctrl_s_ctrl_string(dev->rds_radio_test, "");
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continue;
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}
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no_rds_counter = no_rds_start_counter;
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res = rds_cmd(dev->aci, RDS_STATUS, &buf, 1);
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if (res)
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continue;
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if ((buf >> 3) & 1) {
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res = rds_cmd(dev->aci, RDS_STATIONNAME, text_buffer, 8);
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text_buffer[8] = 0;
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if (!res && sanitize(text_buffer, 8))
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v4l2_ctrl_s_ctrl_string(dev->rds_ps_name, text_buffer);
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}
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if ((buf >> 6) & 1) {
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u8 pty;
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res = rds_cmd(dev->aci, RDS_PTYTATP, &pty, 1);
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if (!res) {
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v4l2_ctrl_s_ctrl(dev->rds_ms, !!(pty & 0x01));
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v4l2_ctrl_s_ctrl(dev->rds_ta, !!(pty & 0x02));
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v4l2_ctrl_s_ctrl(dev->rds_tp, !!(pty & 0x80));
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v4l2_ctrl_s_ctrl(dev->rds_pty, (pty >> 2) & 0x1f);
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}
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}
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if ((buf >> 4) & 1) {
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res = rds_cmd(dev->aci, RDS_TEXT, text_buffer, 65);
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text_buffer[65] = 0;
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if (!res && sanitize(text_buffer + 1, 64))
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v4l2_ctrl_s_ctrl_string(dev->rds_radio_test, text_buffer + 1);
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}
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}
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return 0;
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}
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static int pcm20_open(struct file *file)
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{
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struct pcm20 *dev = video_drvdata(file);
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int res = v4l2_fh_open(file);
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if (!res && v4l2_fh_is_singular_file(file) &&
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IS_ERR_OR_NULL(dev->kthread)) {
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dev->kthread = kthread_run(pcm20_thread, dev, "%s",
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dev->v4l2_dev.name);
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if (IS_ERR(dev->kthread)) {
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v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
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v4l2_fh_release(file);
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return PTR_ERR(dev->kthread);
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}
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}
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return res;
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}
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static int pcm20_release(struct file *file)
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{
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struct pcm20 *dev = video_drvdata(file);
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if (v4l2_fh_is_singular_file(file) && !IS_ERR_OR_NULL(dev->kthread)) {
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kthread_stop(dev->kthread);
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dev->kthread = NULL;
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}
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return v4l2_fh_release(file);
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}
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static const struct v4l2_file_operations pcm20_fops = {
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.owner = THIS_MODULE,
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.open = pcm20_open,
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.poll = v4l2_ctrl_poll,
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.release = pcm20_release,
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.unlocked_ioctl = video_ioctl2,
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};
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static const struct v4l2_ioctl_ops pcm20_ioctl_ops = {
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.vidioc_querycap = vidioc_querycap,
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.vidioc_g_tuner = vidioc_g_tuner,
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@ -195,9 +452,21 @@ static int __init pcm20_init(void)
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}
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hdl = &dev->ctrl_handler;
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v4l2_ctrl_handler_init(hdl, 1);
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v4l2_ctrl_handler_init(hdl, 7);
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v4l2_ctrl_new_std(hdl, &pcm20_ctrl_ops,
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V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
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dev->rds_pty = v4l2_ctrl_new_std(hdl, NULL,
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V4L2_CID_RDS_RX_PTY, 0, 0x1f, 1, 0);
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dev->rds_ps_name = v4l2_ctrl_new_std(hdl, NULL,
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V4L2_CID_RDS_RX_PS_NAME, 0, 8, 8, 0);
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dev->rds_radio_test = v4l2_ctrl_new_std(hdl, NULL,
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V4L2_CID_RDS_RX_RADIO_TEXT, 0, 64, 64, 0);
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dev->rds_ta = v4l2_ctrl_new_std(hdl, NULL,
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V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT, 0, 1, 1, 0);
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dev->rds_tp = v4l2_ctrl_new_std(hdl, NULL,
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V4L2_CID_RDS_RX_TRAFFIC_PROGRAM, 0, 1, 1, 0);
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dev->rds_ms = v4l2_ctrl_new_std(hdl, NULL,
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V4L2_CID_RDS_RX_MUSIC_SPEECH, 0, 1, 1, 1);
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v4l2_dev->ctrl_handler = hdl;
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if (hdl->error) {
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res = hdl->error;
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