From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/media/radio/radio-miropcm20.c | 514 ++++++++++++++++++++++++++++++++++ 1 file changed, 514 insertions(+) create mode 100644 drivers/media/radio/radio-miropcm20.c (limited to 'drivers/media/radio/radio-miropcm20.c') diff --git a/drivers/media/radio/radio-miropcm20.c b/drivers/media/radio/radio-miropcm20.c new file mode 100644 index 000000000..7b35e6331 --- /dev/null +++ b/drivers/media/radio/radio-miropcm20.c @@ -0,0 +1,514 @@ +/* + * Miro PCM20 radio driver for Linux radio support + * (c) 1998 Ruurd Reitsma + * 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 + * + * Many thanks to Fred Seidel , the + * designer of the RDS decoder hardware. With his help + * I was able to code this driver. + * Thanks also to Norberto Pellicci, Dominic Mounteney + * 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 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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); + + 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 | 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] = ' '; + 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; + strlcpy(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; + } + strlcpy(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; + } + strlcpy(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; + 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); -- cgit v1.2.3-54-g00ecf