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[pohmelfs.git] / drivers / media / radio / radio-aimslab.c

/* radiotrack (radioreveal) driver for Linux radio support
 * (c) 1997 M. Kirkwood
 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
 * Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk>
 * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
 *
 * History:
 * 1999-02-24   Russell Kroll <rkroll@exploits.org>
 *              Fine tuning/VIDEO_TUNER_LOW
 *              Frequency range expanded to start at 87 MHz
 *
 * TODO: Allow for more than one of these foolish entities :-)
 *
 * Notes on the hardware (reverse engineered from other peoples'
 * reverse engineering of AIMS' code :-)
 *
 *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
 *
 *  The signal strength query is unsurprisingly inaccurate.  And it seems
 *  to indicate that (on my card, at least) the frequency setting isn't
 *  too great.  (I have to tune up .025MHz from what the freq should be
 *  to get a report that the thing is tuned.)
 *
 *  Volume control is (ugh) analogue:
 *   out(port, start_increasing_volume);
 *   wait(a_wee_while);
 *   out(port, stop_changing_the_volume);
 *
 */

#include <linux/module.h>       /* Modules                      */
#include <linux/init.h>         /* Initdata                     */
#include <linux/ioport.h>       /* request_region               */
#include <linux/delay.h>        /* msleep                       */
#include <linux/videodev2.h>    /* kernel radio structs         */
#include <linux/io.h>           /* outb, outb_p                 */
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>

MODULE_AUTHOR("M.Kirkwood");
MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.0.3");

#ifndef CONFIG_RADIO_RTRACK_PORT
#define CONFIG_RADIO_RTRACK_PORT -1
#endif

static int io = CONFIG_RADIO_RTRACK_PORT;
static int radio_nr = -1;

module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20f or 0x30f)");
module_param(radio_nr, int, 0);

struct rtrack
{
        struct v4l2_device v4l2_dev;
        struct video_device vdev;
        int port;
        int curvol;
        unsigned long curfreq;
        int muted;
        int io;
        struct mutex lock;
};

static struct rtrack rtrack_card;

/* local things */

static void rt_decvol(struct rtrack *rt)
{
        outb(0x58, rt->io);             /* volume down + sigstr + on    */
        msleep(100);
        outb(0xd8, rt->io);             /* volume steady + sigstr + on  */
}

static void rt_incvol(struct rtrack *rt)
{
        outb(0x98, rt->io);             /* volume up + sigstr + on      */
        msleep(100);
        outb(0xd8, rt->io);             /* volume steady + sigstr + on  */
}

static void rt_mute(struct rtrack *rt)
{
        rt->muted = 1;
        mutex_lock(&rt->lock);
        outb(0xd0, rt->io);             /* volume steady, off           */
        mutex_unlock(&rt->lock);
}

static int rt_setvol(struct rtrack *rt, int vol)
{
        int i;

        mutex_lock(&rt->lock);

        if (vol == rt->curvol) {        /* requested volume = current */
                if (rt->muted) {        /* user is unmuting the card  */
                        rt->muted = 0;
                        outb(0xd8, rt->io);     /* enable card */
                }
                mutex_unlock(&rt->lock);
                return 0;
        }

        if (vol == 0) {                 /* volume = 0 means mute the card */
                outb(0x48, rt->io);     /* volume down but still "on"   */
                msleep(2000);   /* make sure it's totally down  */
                outb(0xd0, rt->io);     /* volume steady, off           */
                rt->curvol = 0;         /* track the volume state!      */
                mutex_unlock(&rt->lock);
                return 0;
        }

        rt->muted = 0;
        if (vol > rt->curvol)
                for (i = rt->curvol; i < vol; i++)
                        rt_incvol(rt);
        else
                for (i = rt->curvol; i > vol; i--)
                        rt_decvol(rt);

        rt->curvol = vol;
        mutex_unlock(&rt->lock);
        return 0;
}

/* the 128+64 on these outb's is to keep the volume stable while tuning
 * without them, the volume _will_ creep up with each frequency change
 * and bit 4 (+16) is to keep the signal strength meter enabled
 */

static void send_0_byte(struct rtrack *rt)
{
        if (rt->curvol == 0 || rt->muted) {
                outb_p(128+64+16+  1, rt->io);   /* wr-enable + data low */
                outb_p(128+64+16+2+1, rt->io);   /* clock */
        }
        else {
                outb_p(128+64+16+8+  1, rt->io);  /* on + wr-enable + data low */
                outb_p(128+64+16+8+2+1, rt->io);  /* clock */
        }
        msleep(1);
}

static void send_1_byte(struct rtrack *rt)
{
        if (rt->curvol == 0 || rt->muted) {
                outb_p(128+64+16+4  +1, rt->io);   /* wr-enable+data high */
                outb_p(128+64+16+4+2+1, rt->io);   /* clock */
        }
        else {
                outb_p(128+64+16+8+4  +1, rt->io); /* on+wr-enable+data high */
                outb_p(128+64+16+8+4+2+1, rt->io); /* clock */
        }

        msleep(1);
}

static int rt_setfreq(struct rtrack *rt, unsigned long freq)
{
        int i;

        mutex_lock(&rt->lock);                  /* Stop other ops interfering */

        rt->curfreq = freq;

        /* now uses VIDEO_TUNER_LOW for fine tuning */

        freq += 171200;                 /* Add 10.7 MHz IF              */
        freq /= 800;                    /* Convert to 50 kHz units      */

        send_0_byte(rt);                /*  0: LSB of frequency         */

        for (i = 0; i < 13; i++)        /*   : frequency bits (1-13)    */
                if (freq & (1 << i))
                        send_1_byte(rt);
                else
                        send_0_byte(rt);

        send_0_byte(rt);                /* 14: test bit - always 0    */
        send_0_byte(rt);                /* 15: test bit - always 0    */

        send_0_byte(rt);                /* 16: band data 0 - always 0 */
        send_0_byte(rt);                /* 17: band data 1 - always 0 */
        send_0_byte(rt);                /* 18: band data 2 - always 0 */
        send_0_byte(rt);                /* 19: time base - always 0   */

        send_0_byte(rt);                /* 20: spacing (0 = 25 kHz)   */
        send_1_byte(rt);                /* 21: spacing (1 = 25 kHz)   */
        send_0_byte(rt);                /* 22: spacing (0 = 25 kHz)   */
        send_1_byte(rt);                /* 23: AM/FM (FM = 1, always) */

        if (rt->curvol == 0 || rt->muted)
                outb(0xd0, rt->io);     /* volume steady + sigstr */
        else
                outb(0xd8, rt->io);     /* volume steady + sigstr + on */

        mutex_unlock(&rt->lock);

        return 0;
}

static int rt_getsigstr(struct rtrack *rt)
{
        int sig = 1;

        mutex_lock(&rt->lock);
        if (inb(rt->io) & 2)    /* bit set = no signal present  */
                sig = 0;
        mutex_unlock(&rt->lock);
        return sig;
}

static int vidioc_querycap(struct file *file, void  *priv,
                                        struct v4l2_capability *v)
{
        strlcpy(v->driver, "radio-aimslab", sizeof(v->driver));
        strlcpy(v->card, "RadioTrack", sizeof(v->card));
        strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
        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 rtrack *rt = video_drvdata(file);

        if (v->index > 0)
                return -EINVAL;

        strlcpy(v->name, "FM", sizeof(v->name));
        v->type = V4L2_TUNER_RADIO;
        v->rangelow = 87 * 16000;
        v->rangehigh = 108 * 16000;
        v->rxsubchans = V4L2_TUNER_SUB_MONO;
        v->capability = V4L2_TUNER_CAP_LOW;
        v->audmode = V4L2_TUNER_MODE_MONO;
        v->signal = 0xffff * rt_getsigstr(rt);
        return 0;
}

static int vidioc_s_tuner(struct file *file, void *priv,
                                        struct v4l2_tuner *v)
{
        return v->index ? -EINVAL : 0;
}

static int vidioc_s_frequency(struct file *file, void *priv,
                                        struct v4l2_frequency *f)
{
        struct rtrack *rt = video_drvdata(file);

        if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
                return -EINVAL;
        rt_setfreq(rt, f->frequency);
        return 0;
}

static int vidioc_g_frequency(struct file *file, void *priv,
                                        struct v4l2_frequency *f)
{
        struct rtrack *rt = video_drvdata(file);

        if (f->tuner != 0)
                return -EINVAL;
        f->type = V4L2_TUNER_RADIO;
        f->frequency = rt->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, 0xff, 1, 0xff);
        }
        return -EINVAL;
}

static int vidioc_g_ctrl(struct file *file, void *priv,
                                        struct v4l2_control *ctrl)
{
        struct rtrack *rt = video_drvdata(file);

        switch (ctrl->id) {
        case V4L2_CID_AUDIO_MUTE:
                ctrl->value = rt->muted;
                return 0;
        case V4L2_CID_AUDIO_VOLUME:
                ctrl->value = rt->curvol;
                return 0;
        }
        return -EINVAL;
}

static int vidioc_s_ctrl(struct file *file, void *priv,
                                        struct v4l2_control *ctrl)
{
        struct rtrack *rt = video_drvdata(file);

        switch (ctrl->id) {
        case V4L2_CID_AUDIO_MUTE:
                if (ctrl->value)
                        rt_mute(rt);
                else
                        rt_setvol(rt, rt->curvol);
                return 0;
        case V4L2_CID_AUDIO_VOLUME:
                rt_setvol(rt, 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 rtrack_fops = {
        .owner          = THIS_MODULE,
        .unlocked_ioctl = video_ioctl2,
};

static const struct v4l2_ioctl_ops rtrack_ioctl_ops = {
        .vidioc_querycap    = vidioc_querycap,
        .vidioc_g_tuner     = vidioc_g_tuner,
        .vidioc_s_tuner     = vidioc_s_tuner,
        .vidioc_g_audio     = vidioc_g_audio,
        .vidioc_s_audio     = vidioc_s_audio,
        .vidioc_g_input     = vidioc_g_input,
        .vidioc_s_input     = vidioc_s_input,
        .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,
};

static int __init rtrack_init(void)
{
        struct rtrack *rt = &rtrack_card;
        struct v4l2_device *v4l2_dev = &rt->v4l2_dev;
        int res;

        strlcpy(v4l2_dev->name, "rtrack", sizeof(v4l2_dev->name));
        rt->io = io;

        if (rt->io == -1) {
                v4l2_err(v4l2_dev, "you must set an I/O address with io=0x20f or 0x30f\n");
                return -EINVAL;
        }

        if (!request_region(rt->io, 2, "rtrack")) {
                v4l2_err(v4l2_dev, "port 0x%x already in use\n", rt->io);
                return -EBUSY;
        }

        res = v4l2_device_register(NULL, v4l2_dev);
        if (res < 0) {
                release_region(rt->io, 2);
                v4l2_err(v4l2_dev, "could not register v4l2_device\n");
                return res;
        }

        strlcpy(rt->vdev.name, v4l2_dev->name, sizeof(rt->vdev.name));
        rt->vdev.v4l2_dev = v4l2_dev;
        rt->vdev.fops = &rtrack_fops;
        rt->vdev.ioctl_ops = &rtrack_ioctl_ops;
        rt->vdev.release = video_device_release_empty;
        video_set_drvdata(&rt->vdev, rt);

        /* Set up the I/O locking */

        mutex_init(&rt->lock);

        /* mute card - prevents noisy bootups */

        /* this ensures that the volume is all the way down  */
        outb(0x48, rt->io);             /* volume down but still "on"   */
        msleep(2000);   /* make sure it's totally down  */
        outb(0xc0, rt->io);             /* steady volume, mute card     */

        if (video_register_device(&rt->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
                v4l2_device_unregister(&rt->v4l2_dev);
                release_region(rt->io, 2);
                return -EINVAL;
        }
        v4l2_info(v4l2_dev, "AIMSlab RadioTrack/RadioReveal card driver.\n");

        return 0;
}

static void __exit rtrack_exit(void)
{
        struct rtrack *rt = &rtrack_card;

        video_unregister_device(&rt->vdev);
        v4l2_device_unregister(&rt->v4l2_dev);
        release_region(rt->io, 2);
}

module_init(rtrack_init);
module_exit(rtrack_exit);