android_kernel_xiaomi_sm8350/drivers/media/radio/miropcm20-radio.c
Arjan van de Ven fa027c2a0a [PATCH] mark struct file_operations const 4
Many struct file_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

[akpm@sdl.org: dvb fix]
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 09:48:45 -08:00

267 lines
5.9 KiB
C

/* 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 <media/v4l2-common.h>
#include "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 const struct file_operations pcm20_fops = {
.owner = THIS_MODULE,
.open = video_exclusive_open,
.release = video_exclusive_release,
.ioctl = pcm20_ioctl,
.compat_ioctl = v4l_compat_ioctl32,
.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);