diff options
Diffstat (limited to 'drivers/media/radio/radio-aimslab.c')
-rw-r--r-- | drivers/media/radio/radio-aimslab.c | 474 |
1 files changed, 474 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-aimslab.c b/drivers/media/radio/radio-aimslab.c new file mode 100644 index 0000000..9305e95 --- /dev/null +++ b/drivers/media/radio/radio-aimslab.c @@ -0,0 +1,474 @@ +/* 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.Cox@linux.org> + * 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> /* udelay */ +#include <asm/io.h> /* outb, outb_p */ +#include <asm/uaccess.h> /* copy to/from user */ +#include <linux/videodev2.h> /* kernel radio structs */ +#include <media/v4l2-common.h> +#include <media/v4l2-ioctl.h> + +#include <linux/version.h> /* for KERNEL_VERSION MACRO */ +#define RADIO_VERSION KERNEL_VERSION(0,0,2) + +#ifndef CONFIG_RADIO_RTRACK_PORT +#define CONFIG_RADIO_RTRACK_PORT -1 +#endif + +static int io = CONFIG_RADIO_RTRACK_PORT; +static int radio_nr = -1; +static struct mutex lock; + +struct rt_device +{ + unsigned long in_use; + int port; + int curvol; + unsigned long curfreq; + int muted; +}; + + +/* local things */ + +static void sleep_delay(long n) +{ + /* Sleep nicely for 'n' uS */ + int d=n/msecs_to_jiffies(1000); + if(!d) + udelay(n); + else + msleep(jiffies_to_msecs(d)); +} + +static void rt_decvol(void) +{ + outb(0x58, io); /* volume down + sigstr + on */ + sleep_delay(100000); + outb(0xd8, io); /* volume steady + sigstr + on */ +} + +static void rt_incvol(void) +{ + outb(0x98, io); /* volume up + sigstr + on */ + sleep_delay(100000); + outb(0xd8, io); /* volume steady + sigstr + on */ +} + +static void rt_mute(struct rt_device *dev) +{ + dev->muted = 1; + mutex_lock(&lock); + outb(0xd0, io); /* volume steady, off */ + mutex_unlock(&lock); +} + +static int rt_setvol(struct rt_device *dev, int vol) +{ + int i; + + mutex_lock(&lock); + + if(vol == dev->curvol) { /* requested volume = current */ + if (dev->muted) { /* user is unmuting the card */ + dev->muted = 0; + outb (0xd8, io); /* enable card */ + } + mutex_unlock(&lock); + return 0; + } + + if(vol == 0) { /* volume = 0 means mute the card */ + outb(0x48, io); /* volume down but still "on" */ + sleep_delay(2000000); /* make sure it's totally down */ + outb(0xd0, io); /* volume steady, off */ + dev->curvol = 0; /* track the volume state! */ + mutex_unlock(&lock); + return 0; + } + + dev->muted = 0; + if(vol > dev->curvol) + for(i = dev->curvol; i < vol; i++) + rt_incvol(); + else + for(i = dev->curvol; i > vol; i--) + rt_decvol(); + + dev->curvol = vol; + mutex_unlock(&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(int port, struct rt_device *dev) +{ + if ((dev->curvol == 0) || (dev->muted)) { + outb_p(128+64+16+ 1, port); /* wr-enable + data low */ + outb_p(128+64+16+2+1, port); /* clock */ + } + else { + outb_p(128+64+16+8+ 1, port); /* on + wr-enable + data low */ + outb_p(128+64+16+8+2+1, port); /* clock */ + } + sleep_delay(1000); +} + +static void send_1_byte(int port, struct rt_device *dev) +{ + if ((dev->curvol == 0) || (dev->muted)) { + outb_p(128+64+16+4 +1, port); /* wr-enable+data high */ + outb_p(128+64+16+4+2+1, port); /* clock */ + } + else { + outb_p(128+64+16+8+4 +1, port); /* on+wr-enable+data high */ + outb_p(128+64+16+8+4+2+1, port); /* clock */ + } + + sleep_delay(1000); +} + +static int rt_setfreq(struct rt_device *dev, unsigned long freq) +{ + int i; + + /* adapted from radio-aztech.c */ + + /* now uses VIDEO_TUNER_LOW for fine tuning */ + + freq += 171200; /* Add 10.7 MHz IF */ + freq /= 800; /* Convert to 50 kHz units */ + + mutex_lock(&lock); /* Stop other ops interfering */ + + send_0_byte (io, dev); /* 0: LSB of frequency */ + + for (i = 0; i < 13; i++) /* : frequency bits (1-13) */ + if (freq & (1 << i)) + send_1_byte (io, dev); + else + send_0_byte (io, dev); + + send_0_byte (io, dev); /* 14: test bit - always 0 */ + send_0_byte (io, dev); /* 15: test bit - always 0 */ + + send_0_byte (io, dev); /* 16: band data 0 - always 0 */ + send_0_byte (io, dev); /* 17: band data 1 - always 0 */ + send_0_byte (io, dev); /* 18: band data 2 - always 0 */ + send_0_byte (io, dev); /* 19: time base - always 0 */ + + send_0_byte (io, dev); /* 20: spacing (0 = 25 kHz) */ + send_1_byte (io, dev); /* 21: spacing (1 = 25 kHz) */ + send_0_byte (io, dev); /* 22: spacing (0 = 25 kHz) */ + send_1_byte (io, dev); /* 23: AM/FM (FM = 1, always) */ + + if ((dev->curvol == 0) || (dev->muted)) + outb (0xd0, io); /* volume steady + sigstr */ + else + outb (0xd8, io); /* volume steady + sigstr + on */ + + mutex_unlock(&lock); + + return 0; +} + +static int rt_getsigstr(struct rt_device *dev) +{ + if (inb(io) & 2) /* bit set = no signal present */ + return 0; + return 1; /* signal present */ +} + +static struct v4l2_queryctrl radio_qctrl[] = { + { + .id = V4L2_CID_AUDIO_MUTE, + .name = "Mute", + .minimum = 0, + .maximum = 1, + .default_value = 1, + .type = V4L2_CTRL_TYPE_BOOLEAN, + },{ + .id = V4L2_CID_AUDIO_VOLUME, + .name = "Volume", + .minimum = 0, + .maximum = 0xff, + .step = 1, + .default_value = 0xff, + .type = V4L2_CTRL_TYPE_INTEGER, + } +}; + +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)); + sprintf(v->bus_info, "ISA"); + v->version = RADIO_VERSION; + v->capabilities = V4L2_CAP_TUNER; + return 0; +} + +static int vidioc_g_tuner(struct file *file, void *priv, + struct v4l2_tuner *v) +{ + struct rt_device *rt = video_drvdata(file); + + if (v->index > 0) + return -EINVAL; + + strcpy(v->name, "FM"); + 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) +{ + if (v->index > 0) + return -EINVAL; + return 0; +} + +static int vidioc_s_frequency(struct file *file, void *priv, + struct v4l2_frequency *f) +{ + struct rt_device *rt = video_drvdata(file); + + rt->curfreq = f->frequency; + rt_setfreq(rt, rt->curfreq); + return 0; +} + +static int vidioc_g_frequency(struct file *file, void *priv, + struct v4l2_frequency *f) +{ + struct rt_device *rt = video_drvdata(file); + + f->type = V4L2_TUNER_RADIO; + f->frequency = rt->curfreq; + return 0; +} + +static int vidioc_queryctrl(struct file *file, void *priv, + struct v4l2_queryctrl *qc) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) { + if (qc->id && qc->id == radio_qctrl[i].id) { + memcpy(qc, &(radio_qctrl[i]), + sizeof(*qc)); + return 0; + } + } + return -EINVAL; +} + +static int vidioc_g_ctrl(struct file *file, void *priv, + struct v4l2_control *ctrl) +{ + struct rt_device *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 * 6554; + return 0; + } + return -EINVAL; +} + +static int vidioc_s_ctrl(struct file *file, void *priv, + struct v4l2_control *ctrl) +{ + struct rt_device *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_audio (struct file *file, void *priv, + struct v4l2_audio *a) +{ + if (a->index > 1) + return -EINVAL; + + strcpy(a->name, "Radio"); + a->capability = V4L2_AUDCAP_STEREO; + return 0; +} + +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) +{ + if (i != 0) + return -EINVAL; + return 0; +} + +static int vidioc_s_audio(struct file *file, void *priv, + struct v4l2_audio *a) +{ + if (a->index != 0) + return -EINVAL; + return 0; +} + +static struct rt_device rtrack_unit; + +static int rtrack_exclusive_open(struct inode *inode, struct file *file) +{ + return test_and_set_bit(0, &rtrack_unit.in_use) ? -EBUSY : 0; +} + +static int rtrack_exclusive_release(struct inode *inode, struct file *file) +{ + clear_bit(0, &rtrack_unit.in_use); + return 0; +} + +static const struct file_operations rtrack_fops = { + .owner = THIS_MODULE, + .open = rtrack_exclusive_open, + .release = rtrack_exclusive_release, + .ioctl = video_ioctl2, +#ifdef CONFIG_COMPAT + .compat_ioctl = v4l_compat_ioctl32, +#endif + .llseek = no_llseek, +}; + +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 struct video_device rtrack_radio = { + .name = "RadioTrack radio", + .fops = &rtrack_fops, + .ioctl_ops = &rtrack_ioctl_ops, + .release = video_device_release_empty, +}; + +static int __init rtrack_init(void) +{ + if(io==-1) + { + printk(KERN_ERR "You must set an I/O address with io=0x???\n"); + return -EINVAL; + } + + if (!request_region(io, 2, "rtrack")) + { + printk(KERN_ERR "rtrack: port 0x%x already in use\n", io); + return -EBUSY; + } + + video_set_drvdata(&rtrack_radio, &rtrack_unit); + + if (video_register_device(&rtrack_radio, VFL_TYPE_RADIO, radio_nr) < 0) { + release_region(io, 2); + return -EINVAL; + } + printk(KERN_INFO "AIMSlab RadioTrack/RadioReveal card driver.\n"); + + /* Set up the I/O locking */ + + mutex_init(&lock); + + /* mute card - prevents noisy bootups */ + + /* this ensures that the volume is all the way down */ + outb(0x48, io); /* volume down but still "on" */ + sleep_delay(2000000); /* make sure it's totally down */ + outb(0xc0, io); /* steady volume, mute card */ + rtrack_unit.curvol = 0; + + return 0; +} + +MODULE_AUTHOR("M.Kirkwood"); +MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card."); +MODULE_LICENSE("GPL"); + +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); + +static void __exit cleanup_rtrack_module(void) +{ + video_unregister_device(&rtrack_radio); + release_region(io,2); +} + +module_init(rtrack_init); +module_exit(cleanup_rtrack_module); + |