diff options
Diffstat (limited to 'drivers/media/radio/miropcm20-radio.c')
| -rw-r--r-- | drivers/media/radio/miropcm20-radio.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/drivers/media/radio/miropcm20-radio.c b/drivers/media/radio/miropcm20-radio.c new file mode 100644 index 000000000000..c2ebe8754a95 --- /dev/null +++ b/drivers/media/radio/miropcm20-radio.c @@ -0,0 +1,264 @@ +/* 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 (drivers/sound/aci.c) + * Look there for further info... + */ + +/* Revision history: + * + * 1998 Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl> + * 2000-09-05 Robert Siemer <Robert.Siemer@gmx.de> + * removed unfinished volume control (maybe adding it later again) + * use OSS-mixer; added stereo control + */ + +/* 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 + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/videodev.h> +#include "../../../sound/oss/aci.h" +#include "miropcm20-rds-core.h" + +static int radio_nr = -1; +module_param(radio_nr, int, 0); + +struct pcm20_device { + unsigned long freq; + int muted; + int stereo; +}; + + +static int pcm20_mute(struct pcm20_device *dev, unsigned char mute) +{ + dev->muted = mute; + return aci_write_cmd(ACI_SET_TUNERMUTE, mute); +} + +static int pcm20_stereo(struct pcm20_device *dev, unsigned char stereo) +{ + dev->stereo = stereo; + return aci_write_cmd(ACI_SET_TUNERMONO, !stereo); +} + +static int pcm20_setfreq(struct pcm20_device *dev, unsigned long freq) +{ + unsigned char freql; + unsigned char freqh; + + dev->freq=freq; + + freq /= 160; + if (!(aci_version==0x07 || aci_version>=0xb0)) + freq /= 10; /* I don't know exactly which version + * needs this hack */ + freql = freq & 0xff; + freqh = freq >> 8; + + aci_rds_cmd(RDS_RESET, NULL, 0); + pcm20_stereo(dev, 1); + + return aci_rw_cmd(ACI_WRITE_TUNE, freql, freqh); +} + +static int pcm20_getflags(struct pcm20_device *dev, __u32 *flags, __u16 *signal) +{ + /* okay, check for signal, stereo and rds here... */ + int i; + unsigned char buf; + + if ((i=aci_rw_cmd(ACI_READ_TUNERSTATION, -1, -1))<0) + return i; + pr_debug("check_sig: 0x%x\n", i); + if (i & 0x80) { + /* no signal from tuner */ + *flags=0; + *signal=0; + return 0; + } else + *signal=0xffff; + + if ((i=aci_rw_cmd(ACI_READ_TUNERSTEREO, -1, -1))<0) + return i; + if (i & 0x40) { + *flags=0; + } else { + /* stereo */ + *flags=VIDEO_TUNER_STEREO_ON; + /* I can't see stereo, when forced to mono */ + dev->stereo=1; + } + + if ((i=aci_rds_cmd(RDS_STATUS, &buf, 1))<0) + return i; + if (buf & 1) + /* RDS available */ + *flags|=VIDEO_TUNER_RDS_ON; + else + return 0; + + if ((i=aci_rds_cmd(RDS_RXVALUE, &buf, 1))<0) + return i; + pr_debug("rds-signal: %d\n", buf); + if (buf > 15) { + printk("miropcm20-radio: RX strengths unexpected high...\n"); + buf=15; + } + /* refine signal */ + if ((*signal=SCALE(15, 0xffff, buf))==0) + *signal = 1; + + return 0; +} + +static int pcm20_do_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, void *arg) +{ + struct video_device *dev = video_devdata(file); + struct pcm20_device *pcm20 = dev->priv; + int i; + + switch(cmd) + { + case VIDIOCGCAP: + { + struct video_capability *v = arg; + memset(v,0,sizeof(*v)); + v->type=VID_TYPE_TUNER; + strcpy(v->name, "Miro PCM20"); + v->channels=1; + v->audios=1; + return 0; + } + case VIDIOCGTUNER: + { + struct video_tuner *v = arg; + if(v->tuner) /* Only 1 tuner */ + return -EINVAL; + v->rangelow=87*16000; + v->rangehigh=108*16000; + pcm20_getflags(pcm20, &v->flags, &v->signal); + v->flags|=VIDEO_TUNER_LOW; + v->mode=VIDEO_MODE_AUTO; + strcpy(v->name, "FM"); + return 0; + } + case VIDIOCSTUNER: + { + struct video_tuner *v = arg; + if(v->tuner!=0) + return -EINVAL; + /* Only 1 tuner so no setting needed ! */ + return 0; + } + case VIDIOCGFREQ: + { + unsigned long *freq = arg; + *freq = pcm20->freq; + return 0; + } + case VIDIOCSFREQ: + { + unsigned long *freq = arg; + pcm20->freq = *freq; + i=pcm20_setfreq(pcm20, pcm20->freq); + pr_debug("First view (setfreq): 0x%x\n", i); + return i; + } + case VIDIOCGAUDIO: + { + struct video_audio *v = arg; + memset(v,0, sizeof(*v)); + v->flags=VIDEO_AUDIO_MUTABLE; + if (pcm20->muted) + v->flags|=VIDEO_AUDIO_MUTE; + v->mode=VIDEO_SOUND_STEREO; + if (pcm20->stereo) + v->mode|=VIDEO_SOUND_MONO; + /* v->step=2048; */ + strcpy(v->name, "Radio"); + return 0; + } + case VIDIOCSAUDIO: + { + struct video_audio *v = arg; + if(v->audio) + return -EINVAL; + + pcm20_mute(pcm20, !!(v->flags&VIDEO_AUDIO_MUTE)); + if(v->flags&VIDEO_SOUND_MONO) + pcm20_stereo(pcm20, 0); + if(v->flags&VIDEO_SOUND_STEREO) + pcm20_stereo(pcm20, 1); + + return 0; + } + default: + return -ENOIOCTLCMD; + } +} + +static int pcm20_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + return video_usercopy(inode, file, cmd, arg, pcm20_do_ioctl); +} + +static struct pcm20_device pcm20_unit = { + .freq = 87*16000, + .muted = 1, +}; + +static struct file_operations pcm20_fops = { + .owner = THIS_MODULE, + .open = video_exclusive_open, + .release = video_exclusive_release, + .ioctl = pcm20_ioctl, + .llseek = no_llseek, +}; + +static struct video_device pcm20_radio = { + .owner = THIS_MODULE, + .name = "Miro PCM 20 radio", + .type = VID_TYPE_TUNER, + .hardware = VID_HARDWARE_RTRACK, + .fops = &pcm20_fops, + .priv = &pcm20_unit +}; + +static int __init pcm20_init(void) +{ + if(video_register_device(&pcm20_radio, VFL_TYPE_RADIO, radio_nr)==-1) + goto video_register_device; + + if(attach_aci_rds()<0) + goto attach_aci_rds; + + printk(KERN_INFO "Miro PCM20 radio card driver.\n"); + + return 0; + + attach_aci_rds: + video_unregister_device(&pcm20_radio); + video_register_device: + return -EINVAL; +} + +MODULE_AUTHOR("Ruurd Reitsma"); +MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card."); +MODULE_LICENSE("GPL"); + +static void __exit pcm20_cleanup(void) +{ + unload_aci_rds(); + video_unregister_device(&pcm20_radio); +} + +module_init(pcm20_init); +module_exit(pcm20_cleanup); |