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path: root/drivers/media/radio/radio-miropcm20.c
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Diffstat (limited to 'drivers/media/radio/radio-miropcm20.c')
-rw-r--r--drivers/media/radio/radio-miropcm20.c515
1 files changed, 515 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-miropcm20.c b/drivers/media/radio/radio-miropcm20.c
new file mode 100644
index 0000000000..99788834c6
--- /dev/null
+++ b/drivers/media/radio/radio-miropcm20.c
@@ -0,0 +1,515 @@
+// 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)
+{
+ struct pcm20 *dev = video_drvdata(file);
+
+ strscpy(v->driver, "Miro PCM20", sizeof(v->driver));
+ strscpy(v->card, "Miro PCM20", sizeof(v->card));
+ snprintf(v->bus_info, sizeof(v->bus_info), "ISA:%s", dev->v4l2_dev.name);
+ 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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 05:46:12 +0000