From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
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@xxxxxxxxx>
---
drivers/media/radio/radio-miropcm20.c | 303 ++++++++++++++++++++++++++++++++--
1 file changed, 286 insertions(+), 17 deletions(-)
diff --git a/drivers/media/radio/radio-miropcm20.c b/drivers/media/radio/radio-miropcm20.c
index 3d12edf..72df00e 100644
--- a/drivers/media/radio/radio-miropcm20.c
+++ b/drivers/media/radio/radio-miropcm20.c
@@ -1,20 +1,35 @@
-/* Miro PCM20 radio driver for Linux radio support
+/*
+ * Miro PCM20 radio driver for Linux radio support
* (c) 1998 Ruurd Reitsma <R.A.Reitsma@xxxxxxxxxxxxxxx>
* 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...
- */
-
-/* What ever you think about the ACI, version 0x07 is not very well!
- * I can't get frequency, 'tuner status', 'tuner flags' or mute/mono
- * conditions... Robert
+ *
+ * From the original miro RDS sources:
+ *
+ * (c) 2001 Robert Siemer <Robert.Siemer@xxxxxx>
+ *
+ * Many thanks to Fred Seidel <seidel@xxxxxxxxxx>, 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@xxxxxxxxxxxxxxx> 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@xxxxxxxxx>
*/
#include <linux/module.h>
#include <linux/init.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>
@@ -22,6 +37,22 @@
#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)");
@@ -30,6 +61,14 @@ 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;
@@ -41,6 +80,103 @@ static struct pcm20 pcm20_card = {
.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;
@@ -54,17 +190,10 @@ static int pcm20_setfreq(struct pcm20 *dev, unsigned long freq)
freql = freq & 0xff;
freqh = freq >> 8;
+ rds_cmd(aci, RDS_RESET, 0, 0);
return snd_aci_cmd(aci, ACI_WRITE_TUNE, freql, freqh);
}
-static const struct v4l2_file_operations pcm20_fops = {
- .owner = THIS_MODULE,
- .open = v4l2_fh_open,
- .poll = v4l2_ctrl_poll,
- .release = v4l2_fh_release,
- .unlocked_ioctl = video_ioctl2,
-};
-
static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *v)
{
@@ -73,16 +202,31 @@ static int vidioc_querycap(struct file *file, void *priv,
strlcpy(v->driver, "Miro PCM20", sizeof(v->driver));
strlcpy(v->card, "Miro PCM20", sizeof(v->card));
snprintf(v->bus_info, sizeof(v->bus_info), "ISA:%s", dev->v4l2_dev.name);
- v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
+ v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
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] >= 128) {
+ 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;
@@ -97,8 +241,12 @@ static int vidioc_g_tuner(struct file *file, void *priv,
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;
+ 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;
}
@@ -157,6 +305,115 @@ static int pcm20_s_ctrl(struct v4l2_ctrl *ctrl)
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,
@@ -195,9 +452,21 @@ static int __init pcm20_init(void)
}
hdl = &dev->ctrl_handler;
- v4l2_ctrl_handler_init(hdl, 1);
+ 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;
--
2.0.1
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