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linux/drivers/media/radio/radio-trust.c
Hans Verkuil 32958fdd16 [media] BKL: trivial BKL removal from V4L2 radio drivers 
The patch converts a bunch of V4L2 radio drivers to unlocked_ioctl.

These are all simple conversions: most already had a lock and so the ioctl
fop could simply be replaced by unlocked_ioctl.

radio-miropcm20.c was converted to use the new V4L2 core lock.

While doing this work I noticed that many of these drivers initialized
some more fields or muted audio or something like that *after* creating
the device node. This should be done before the device node is created
to prevent problems. Especially hal tends to grab a device node as soon
as it is created.

In one or two cases the mutex_init was even done after the device creation!

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-12-01 20:10:05 -02:00

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/* radio-trust.c - Trust FM Radio card driver for Linux 2.2
* by Eric Lammerts <eric@scintilla.utwente.nl>
*
* Based on radio-aztech.c. Original notes:
*
* Adapted to support the Video for Linux API by
* Russell Kroll <rkroll@exploits.org>. Based on original tuner code by:
*
* Quay Ly
* Donald Song
* Jason Lewis (jlewis@twilight.vtc.vsc.edu)
* Scott McGrath (smcgrath@twilight.vtc.vsc.edu)
* William McGrath (wmcgrath@twilight.vtc.vsc.edu)
*
* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
*/
#include <stdarg.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/version.h> /* for KERNEL_VERSION MACRO */
#include <linux/videodev2.h>
#include <linux/io.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
MODULE_LICENSE("GPL");
/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
#ifndef CONFIG_RADIO_TRUST_PORT
#define CONFIG_RADIO_TRUST_PORT -1
#endif
static int io = CONFIG_RADIO_TRUST_PORT;
static int radio_nr = -1;
module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");
module_param(radio_nr, int, 0);
#define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
struct trust {
struct v4l2_device v4l2_dev;
struct video_device vdev;
int io;
int ioval;
__u16 curvol;
__u16 curbass;
__u16 curtreble;
int muted;
unsigned long curfreq;
int curstereo;
int curmute;
struct mutex lock;
};
static struct trust trust_card;
/* i2c addresses */
#define TDA7318_ADDR 0x88
#define TSA6060T_ADDR 0xc4
#define TR_DELAY do { inb(tr->io); inb(tr->io); inb(tr->io); } while (0)
#define TR_SET_SCL outb(tr->ioval |= 2, tr->io)
#define TR_CLR_SCL outb(tr->ioval &= 0xfd, tr->io)
#define TR_SET_SDA outb(tr->ioval |= 1, tr->io)
#define TR_CLR_SDA outb(tr->ioval &= 0xfe, tr->io)
static void write_i2c(struct trust *tr, int n, ...)
{
unsigned char val, mask;
va_list args;
va_start(args, n);
/* start condition */
TR_SET_SDA;
TR_SET_SCL;
TR_DELAY;
TR_CLR_SDA;
TR_CLR_SCL;
TR_DELAY;
for(; n; n--) {
val = va_arg(args, unsigned);
for(mask = 0x80; mask; mask >>= 1) {
if(val & mask)
TR_SET_SDA;
else
TR_CLR_SDA;
TR_SET_SCL;
TR_DELAY;
TR_CLR_SCL;
TR_DELAY;
}
/* acknowledge bit */
TR_SET_SDA;
TR_SET_SCL;
TR_DELAY;
TR_CLR_SCL;
TR_DELAY;
}
/* stop condition */
TR_CLR_SDA;
TR_DELAY;
TR_SET_SCL;
TR_DELAY;
TR_SET_SDA;
TR_DELAY;
va_end(args);
}
static void tr_setvol(struct trust *tr, __u16 vol)
{
mutex_lock(&tr->lock);
tr->curvol = vol / 2048;
write_i2c(tr, 2, TDA7318_ADDR, tr->curvol ^ 0x1f);
mutex_unlock(&tr->lock);
}
static int basstreble2chip[15] = {
0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
};
static void tr_setbass(struct trust *tr, __u16 bass)
{
mutex_lock(&tr->lock);
tr->curbass = bass / 4370;
write_i2c(tr, 2, TDA7318_ADDR, 0x60 | basstreble2chip[tr->curbass]);
mutex_unlock(&tr->lock);
}
static void tr_settreble(struct trust *tr, __u16 treble)
{
mutex_lock(&tr->lock);
tr->curtreble = treble / 4370;
write_i2c(tr, 2, TDA7318_ADDR, 0x70 | basstreble2chip[tr->curtreble]);
mutex_unlock(&tr->lock);
}
static void tr_setstereo(struct trust *tr, int stereo)
{
mutex_lock(&tr->lock);
tr->curstereo = !!stereo;
tr->ioval = (tr->ioval & 0xfb) | (!tr->curstereo << 2);
outb(tr->ioval, tr->io);
mutex_unlock(&tr->lock);
}
static void tr_setmute(struct trust *tr, int mute)
{
mutex_lock(&tr->lock);
tr->curmute = !!mute;
tr->ioval = (tr->ioval & 0xf7) | (tr->curmute << 3);
outb(tr->ioval, tr->io);
mutex_unlock(&tr->lock);
}
static int tr_getsigstr(struct trust *tr)
{
int i, v;
mutex_lock(&tr->lock);
for (i = 0, v = 0; i < 100; i++)
v |= inb(tr->io);
mutex_unlock(&tr->lock);
return (v & 1) ? 0 : 0xffff;
}
static int tr_getstereo(struct trust *tr)
{
/* don't know how to determine it, just return the setting */
return tr->curstereo;
}
static void tr_setfreq(struct trust *tr, unsigned long f)
{
mutex_lock(&tr->lock);
tr->curfreq = f;
f /= 160; /* Convert to 10 kHz units */
f += 1070; /* Add 10.7 MHz IF */
write_i2c(tr, 5, TSA6060T_ADDR, (f << 1) | 1, f >> 7, 0x60 | ((f >> 15) & 1), 0);
mutex_unlock(&tr->lock);
}
static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *v)
{
strlcpy(v->driver, "radio-trust", sizeof(v->driver));
strlcpy(v->card, "Trust FM Radio", sizeof(v->card));
strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
v->version = RADIO_VERSION;
v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
return 0;
}
static int vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct trust *tr = video_drvdata(file);
if (v->index > 0)
return -EINVAL;
strlcpy(v->name, "FM", sizeof(v->name));
v->type = V4L2_TUNER_RADIO;
v->rangelow = 87.5 * 16000;
v->rangehigh = 108 * 16000;
v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
v->capability = V4L2_TUNER_CAP_LOW;
if (tr_getstereo(tr))
v->audmode = V4L2_TUNER_MODE_STEREO;
else
v->audmode = V4L2_TUNER_MODE_MONO;
v->signal = tr_getsigstr(tr);
return 0;
}
static int vidioc_s_tuner(struct file *file, void *priv,
struct v4l2_tuner *v)
{
struct trust *tr = video_drvdata(file);
if (v->index)
return -EINVAL;
tr_setstereo(tr, v->audmode == V4L2_TUNER_MODE_STEREO);
return 0;
}
static int vidioc_s_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct trust *tr = video_drvdata(file);
if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
return -EINVAL;
tr_setfreq(tr, f->frequency);
return 0;
}
static int vidioc_g_frequency(struct file *file, void *priv,
struct v4l2_frequency *f)
{
struct trust *tr = video_drvdata(file);
if (f->tuner != 0)
return -EINVAL;
f->type = V4L2_TUNER_RADIO;
f->frequency = tr->curfreq;
return 0;
}
static int vidioc_queryctrl(struct file *file, void *priv,
struct v4l2_queryctrl *qc)
{
switch (qc->id) {
case V4L2_CID_AUDIO_MUTE:
return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
case V4L2_CID_AUDIO_VOLUME:
return v4l2_ctrl_query_fill(qc, 0, 65535, 2048, 65535);
case V4L2_CID_AUDIO_BASS:
case V4L2_CID_AUDIO_TREBLE:
return v4l2_ctrl_query_fill(qc, 0, 65535, 4370, 32768);
}
return -EINVAL;
}
static int vidioc_g_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct trust *tr = video_drvdata(file);
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
ctrl->value = tr->curmute;
return 0;
case V4L2_CID_AUDIO_VOLUME:
ctrl->value = tr->curvol * 2048;
return 0;
case V4L2_CID_AUDIO_BASS:
ctrl->value = tr->curbass * 4370;
return 0;
case V4L2_CID_AUDIO_TREBLE:
ctrl->value = tr->curtreble * 4370;
return 0;
}
return -EINVAL;
}
static int vidioc_s_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct trust *tr = video_drvdata(file);
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
tr_setmute(tr, ctrl->value);
return 0;
case V4L2_CID_AUDIO_VOLUME:
tr_setvol(tr, ctrl->value);
return 0;
case V4L2_CID_AUDIO_BASS:
tr_setbass(tr, ctrl->value);
return 0;
case V4L2_CID_AUDIO_TREBLE:
tr_settreble(tr, ctrl->value);
return 0;
}
return -EINVAL;
}
static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
{
*i = 0;
return 0;
}
static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
{
return i ? -EINVAL : 0;
}
static int vidioc_g_audio(struct file *file, void *priv,
struct v4l2_audio *a)
{
a->index = 0;
strlcpy(a->name, "Radio", sizeof(a->name));
a->capability = V4L2_AUDCAP_STEREO;
return 0;
}
static int vidioc_s_audio(struct file *file, void *priv,
struct v4l2_audio *a)
{
return a->index ? -EINVAL : 0;
}
static const struct v4l2_file_operations trust_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = video_ioctl2,
};
static const struct v4l2_ioctl_ops trust_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_queryctrl = vidioc_queryctrl,
.vidioc_g_ctrl = vidioc_g_ctrl,
.vidioc_s_ctrl = vidioc_s_ctrl,
.vidioc_g_audio = vidioc_g_audio,
.vidioc_s_audio = vidioc_s_audio,
.vidioc_g_input = vidioc_g_input,
.vidioc_s_input = vidioc_s_input,
};
static int __init trust_init(void)
{
struct trust *tr = &trust_card;
struct v4l2_device *v4l2_dev = &tr->v4l2_dev;
int res;
strlcpy(v4l2_dev->name, "trust", sizeof(v4l2_dev->name));
tr->io = io;
tr->ioval = 0xf;
mutex_init(&tr->lock);
if (tr->io == -1) {
v4l2_err(v4l2_dev, "You must set an I/O address with io=0x0x350 or 0x358\n");
return -EINVAL;
}
if (!request_region(tr->io, 2, "Trust FM Radio")) {
v4l2_err(v4l2_dev, "port 0x%x already in use\n", tr->io);
return -EBUSY;
}
res = v4l2_device_register(NULL, v4l2_dev);
if (res < 0) {
release_region(tr->io, 2);
v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
return res;
}
strlcpy(tr->vdev.name, v4l2_dev->name, sizeof(tr->vdev.name));
tr->vdev.v4l2_dev = v4l2_dev;
tr->vdev.fops = &trust_fops;
tr->vdev.ioctl_ops = &trust_ioctl_ops;
tr->vdev.release = video_device_release_empty;
video_set_drvdata(&tr->vdev, tr);
write_i2c(tr, 2, TDA7318_ADDR, 0x80); /* speaker att. LF = 0 dB */
write_i2c(tr, 2, TDA7318_ADDR, 0xa0); /* speaker att. RF = 0 dB */
write_i2c(tr, 2, TDA7318_ADDR, 0xc0); /* speaker att. LR = 0 dB */
write_i2c(tr, 2, TDA7318_ADDR, 0xe0); /* speaker att. RR = 0 dB */
write_i2c(tr, 2, TDA7318_ADDR, 0x40); /* stereo 1 input, gain = 18.75 dB */
tr_setvol(tr, 0xffff);
tr_setbass(tr, 0x8000);
tr_settreble(tr, 0x8000);
tr_setstereo(tr, 1);
/* mute card - prevents noisy bootups */
tr_setmute(tr, 1);
if (video_register_device(&tr->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
v4l2_device_unregister(v4l2_dev);
release_region(tr->io, 2);
return -EINVAL;
}
v4l2_info(v4l2_dev, "Trust FM Radio card driver v1.0.\n");
return 0;
}
static void __exit cleanup_trust_module(void)
{
struct trust *tr = &trust_card;
video_unregister_device(&tr->vdev);
v4l2_device_unregister(&tr->v4l2_dev);
release_region(tr->io, 2);
}
module_init(trust_init);
module_exit(cleanup_trust_module);
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