684 lines
17 KiB
C
684 lines
17 KiB
C
/* radio-cadet.c - A video4linux driver for the ADS Cadet AM/FM Radio Card
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*
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* by Fred Gleason <fredg@wava.com>
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* Version 0.3.3
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*
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* (Loosely) based on code for the Aztech radio card by
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*
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* Russell Kroll (rkroll@exploits.org)
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* Quay Ly
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* Donald Song
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* Jason Lewis (jlewis@twilight.vtc.vsc.edu)
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* Scott McGrath (smcgrath@twilight.vtc.vsc.edu)
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* William McGrath (wmcgrath@twilight.vtc.vsc.edu)
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*
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* History:
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* 2000-04-29 Russell Kroll <rkroll@exploits.org>
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* Added ISAPnP detection for Linux 2.3/2.4
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*
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* 2001-01-10 Russell Kroll <rkroll@exploits.org>
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* Removed dead CONFIG_RADIO_CADET_PORT code
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* PnP detection on load is now default (no args necessary)
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*
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* 2002-01-17 Adam Belay <ambx1@neo.rr.com>
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* Updated to latest pnp code
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*
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* 2003-01-31 Alan Cox <alan@lxorguk.ukuu.org.uk>
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* Cleaned up locking, delay code, general odds and ends
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*
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* 2006-07-30 Hans J. Koch <koch@hjk-az.de>
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* Changed API to V4L2
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*/
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#include <linux/module.h> /* Modules */
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#include <linux/init.h> /* Initdata */
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#include <linux/ioport.h> /* request_region */
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#include <linux/delay.h> /* udelay */
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#include <linux/videodev2.h> /* V4L2 API defs */
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#include <linux/param.h>
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#include <linux/pnp.h>
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#include <linux/sched.h>
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#include <linux/io.h> /* outb, outb_p */
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#include <media/v4l2-device.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-fh.h>
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#include <media/v4l2-event.h>
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MODULE_AUTHOR("Fred Gleason, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
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MODULE_DESCRIPTION("A driver for the ADS Cadet AM/FM/RDS radio card.");
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MODULE_LICENSE("GPL");
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MODULE_VERSION("0.3.4");
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static int io = -1; /* default to isapnp activation */
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static int radio_nr = -1;
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module_param(io, int, 0);
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MODULE_PARM_DESC(io, "I/O address of Cadet card (0x330,0x332,0x334,0x336,0x338,0x33a,0x33c,0x33e)");
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module_param(radio_nr, int, 0);
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#define RDS_BUFFER 256
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#define RDS_RX_FLAG 1
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#define MBS_RX_FLAG 2
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struct cadet {
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struct v4l2_device v4l2_dev;
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struct video_device vdev;
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struct v4l2_ctrl_handler ctrl_handler;
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int io;
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bool is_fm_band;
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u32 curfreq;
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int tunestat;
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int sigstrength;
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wait_queue_head_t read_queue;
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struct timer_list readtimer;
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u8 rdsin, rdsout, rdsstat;
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unsigned char rdsbuf[RDS_BUFFER];
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struct mutex lock;
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int reading;
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};
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static struct cadet cadet_card;
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/*
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* Signal Strength Threshold Values
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* The V4L API spec does not define any particular unit for the signal
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* strength value. These values are in microvolts of RF at the tuner's input.
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*/
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static u16 sigtable[2][4] = {
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{ 1835, 2621, 4128, 65535 },
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{ 2185, 4369, 13107, 65535 },
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};
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static const struct v4l2_frequency_band bands[] = {
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{
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.index = 0,
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.type = V4L2_TUNER_RADIO,
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.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS,
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.rangelow = 8320, /* 520 kHz */
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.rangehigh = 26400, /* 1650 kHz */
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.modulation = V4L2_BAND_MODULATION_AM,
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}, {
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.index = 1,
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.type = V4L2_TUNER_RADIO,
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.capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_RDS |
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V4L2_TUNER_CAP_RDS_BLOCK_IO | V4L2_TUNER_CAP_LOW |
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V4L2_TUNER_CAP_FREQ_BANDS,
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.rangelow = 1400000, /* 87.5 MHz */
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.rangehigh = 1728000, /* 108.0 MHz */
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.modulation = V4L2_BAND_MODULATION_FM,
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},
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};
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static int cadet_getstereo(struct cadet *dev)
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{
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int ret = V4L2_TUNER_SUB_MONO;
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if (!dev->is_fm_band) /* Only FM has stereo capability! */
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return V4L2_TUNER_SUB_MONO;
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outb(7, dev->io); /* Select tuner control */
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if ((inb(dev->io + 1) & 0x40) == 0)
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ret = V4L2_TUNER_SUB_STEREO;
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return ret;
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}
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static unsigned cadet_gettune(struct cadet *dev)
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{
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int curvol, i;
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unsigned fifo = 0;
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/*
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* Prepare for read
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*/
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outb(7, dev->io); /* Select tuner control */
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curvol = inb(dev->io + 1); /* Save current volume/mute setting */
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outb(0x00, dev->io + 1); /* Ensure WRITE-ENABLE is LOW */
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dev->tunestat = 0xffff;
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/*
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* Read the shift register
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*/
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for (i = 0; i < 25; i++) {
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fifo = (fifo << 1) | ((inb(dev->io + 1) >> 7) & 0x01);
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if (i < 24) {
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outb(0x01, dev->io + 1);
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dev->tunestat &= inb(dev->io + 1);
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outb(0x00, dev->io + 1);
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}
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}
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/*
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* Restore volume/mute setting
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*/
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outb(curvol, dev->io + 1);
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return fifo;
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}
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static unsigned cadet_getfreq(struct cadet *dev)
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{
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int i;
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unsigned freq = 0, test, fifo = 0;
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/*
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* Read current tuning
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*/
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fifo = cadet_gettune(dev);
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/*
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* Convert to actual frequency
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*/
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if (!dev->is_fm_band) /* AM */
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return ((fifo & 0x7fff) - 450) * 16;
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test = 12500;
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for (i = 0; i < 14; i++) {
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if ((fifo & 0x01) != 0)
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freq += test;
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test = test << 1;
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fifo = fifo >> 1;
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}
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freq -= 10700000; /* IF frequency is 10.7 MHz */
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freq = (freq * 16) / 1000; /* Make it 1/16 kHz */
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return freq;
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}
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static void cadet_settune(struct cadet *dev, unsigned fifo)
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{
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int i;
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unsigned test;
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outb(7, dev->io); /* Select tuner control */
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/*
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* Write the shift register
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*/
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test = 0;
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test = (fifo >> 23) & 0x02; /* Align data for SDO */
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test |= 0x1c; /* SDM=1, SWE=1, SEN=1, SCK=0 */
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outb(7, dev->io); /* Select tuner control */
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outb(test, dev->io + 1); /* Initialize for write */
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for (i = 0; i < 25; i++) {
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test |= 0x01; /* Toggle SCK High */
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outb(test, dev->io + 1);
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test &= 0xfe; /* Toggle SCK Low */
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outb(test, dev->io + 1);
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fifo = fifo << 1; /* Prepare the next bit */
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test = 0x1c | ((fifo >> 23) & 0x02);
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outb(test, dev->io + 1);
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}
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}
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static void cadet_setfreq(struct cadet *dev, unsigned freq)
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{
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unsigned fifo;
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int i, j, test;
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int curvol;
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freq = clamp(freq, bands[dev->is_fm_band].rangelow,
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bands[dev->is_fm_band].rangehigh);
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dev->curfreq = freq;
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/*
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* Formulate a fifo command
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*/
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fifo = 0;
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if (dev->is_fm_band) { /* FM */
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test = 102400;
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freq = freq / 16; /* Make it kHz */
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freq += 10700; /* IF is 10700 kHz */
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for (i = 0; i < 14; i++) {
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fifo = fifo << 1;
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if (freq >= test) {
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fifo |= 0x01;
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freq -= test;
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}
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test = test >> 1;
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}
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} else { /* AM */
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fifo = (freq / 16) + 450; /* Make it kHz */
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fifo |= 0x100000; /* Select AM Band */
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}
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/*
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* Save current volume/mute setting
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*/
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outb(7, dev->io); /* Select tuner control */
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curvol = inb(dev->io + 1);
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/*
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* Tune the card
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*/
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for (j = 3; j > -1; j--) {
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cadet_settune(dev, fifo | (j << 16));
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outb(7, dev->io); /* Select tuner control */
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outb(curvol, dev->io + 1);
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msleep(100);
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cadet_gettune(dev);
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if ((dev->tunestat & 0x40) == 0) { /* Tuned */
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dev->sigstrength = sigtable[dev->is_fm_band][j];
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goto reset_rds;
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}
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}
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dev->sigstrength = 0;
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reset_rds:
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outb(3, dev->io);
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outb(inb(dev->io + 1) & 0x7f, dev->io + 1);
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}
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static bool cadet_has_rds_data(struct cadet *dev)
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{
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bool result;
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mutex_lock(&dev->lock);
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result = dev->rdsin != dev->rdsout;
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mutex_unlock(&dev->lock);
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return result;
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}
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static void cadet_handler(unsigned long data)
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{
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struct cadet *dev = (void *)data;
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/* Service the RDS fifo */
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if (mutex_trylock(&dev->lock)) {
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outb(0x3, dev->io); /* Select RDS Decoder Control */
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if ((inb(dev->io + 1) & 0x20) != 0)
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pr_err("cadet: RDS fifo overflow\n");
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outb(0x80, dev->io); /* Select RDS fifo */
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while ((inb(dev->io) & 0x80) != 0) {
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dev->rdsbuf[dev->rdsin] = inb(dev->io + 1);
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if (dev->rdsin + 1 != dev->rdsout)
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dev->rdsin++;
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}
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mutex_unlock(&dev->lock);
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}
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/*
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* Service pending read
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*/
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if (cadet_has_rds_data(dev))
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wake_up_interruptible(&dev->read_queue);
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/*
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* Clean up and exit
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*/
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init_timer(&dev->readtimer);
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dev->readtimer.function = cadet_handler;
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dev->readtimer.data = data;
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dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
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add_timer(&dev->readtimer);
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}
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static void cadet_start_rds(struct cadet *dev)
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{
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dev->rdsstat = 1;
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outb(0x80, dev->io); /* Select RDS fifo */
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init_timer(&dev->readtimer);
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dev->readtimer.function = cadet_handler;
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dev->readtimer.data = (unsigned long)dev;
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dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
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add_timer(&dev->readtimer);
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}
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static ssize_t cadet_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
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{
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struct cadet *dev = video_drvdata(file);
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unsigned char readbuf[RDS_BUFFER];
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int i = 0;
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mutex_lock(&dev->lock);
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if (dev->rdsstat == 0)
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cadet_start_rds(dev);
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mutex_unlock(&dev->lock);
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if (!cadet_has_rds_data(dev) && (file->f_flags & O_NONBLOCK))
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return -EWOULDBLOCK;
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i = wait_event_interruptible(dev->read_queue, cadet_has_rds_data(dev));
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if (i)
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return i;
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mutex_lock(&dev->lock);
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while (i < count && dev->rdsin != dev->rdsout)
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readbuf[i++] = dev->rdsbuf[dev->rdsout++];
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mutex_unlock(&dev->lock);
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if (i && copy_to_user(data, readbuf, i))
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return -EFAULT;
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return i;
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}
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static int vidioc_querycap(struct file *file, void *priv,
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struct v4l2_capability *v)
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{
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strlcpy(v->driver, "ADS Cadet", sizeof(v->driver));
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strlcpy(v->card, "ADS Cadet", sizeof(v->card));
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strlcpy(v->bus_info, "ISA:radio-cadet", sizeof(v->bus_info));
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v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO |
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V4L2_CAP_READWRITE | V4L2_CAP_RDS_CAPTURE;
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v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
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return 0;
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}
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static int vidioc_g_tuner(struct file *file, void *priv,
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struct v4l2_tuner *v)
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{
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struct cadet *dev = video_drvdata(file);
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if (v->index)
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return -EINVAL;
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v->type = V4L2_TUNER_RADIO;
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strlcpy(v->name, "Radio", sizeof(v->name));
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v->capability = bands[0].capability | bands[1].capability;
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v->rangelow = bands[0].rangelow; /* 520 kHz (start of AM band) */
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v->rangehigh = bands[1].rangehigh; /* 108.0 MHz (end of FM band) */
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if (dev->is_fm_band) {
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v->rxsubchans = cadet_getstereo(dev);
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outb(3, dev->io);
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outb(inb(dev->io + 1) & 0x7f, dev->io + 1);
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mdelay(100);
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outb(3, dev->io);
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if (inb(dev->io + 1) & 0x80)
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v->rxsubchans |= V4L2_TUNER_SUB_RDS;
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} else {
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v->rangelow = 8320; /* 520 kHz */
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v->rangehigh = 26400; /* 1650 kHz */
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v->rxsubchans = V4L2_TUNER_SUB_MONO;
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}
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v->audmode = V4L2_TUNER_MODE_STEREO;
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v->signal = dev->sigstrength; /* We might need to modify scaling of this */
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return 0;
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}
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static int vidioc_s_tuner(struct file *file, void *priv,
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const struct v4l2_tuner *v)
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{
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return v->index ? -EINVAL : 0;
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}
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static int vidioc_enum_freq_bands(struct file *file, void *priv,
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struct v4l2_frequency_band *band)
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{
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if (band->tuner)
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return -EINVAL;
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if (band->index >= ARRAY_SIZE(bands))
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return -EINVAL;
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*band = bands[band->index];
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return 0;
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}
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static int vidioc_g_frequency(struct file *file, void *priv,
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struct v4l2_frequency *f)
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{
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struct cadet *dev = video_drvdata(file);
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if (f->tuner)
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return -EINVAL;
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f->type = V4L2_TUNER_RADIO;
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f->frequency = dev->curfreq;
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return 0;
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}
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static int vidioc_s_frequency(struct file *file, void *priv,
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const struct v4l2_frequency *f)
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{
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struct cadet *dev = video_drvdata(file);
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if (f->tuner)
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return -EINVAL;
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dev->is_fm_band =
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f->frequency >= (bands[0].rangehigh + bands[1].rangelow) / 2;
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cadet_setfreq(dev, f->frequency);
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return 0;
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}
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static int cadet_s_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct cadet *dev = container_of(ctrl->handler, struct cadet, ctrl_handler);
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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outb(7, dev->io); /* Select tuner control */
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if (ctrl->val)
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outb(0x00, dev->io + 1);
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else
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outb(0x20, dev->io + 1);
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return 0;
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}
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return -EINVAL;
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}
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static int cadet_open(struct file *file)
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{
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struct cadet *dev = video_drvdata(file);
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int err;
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mutex_lock(&dev->lock);
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err = v4l2_fh_open(file);
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if (err)
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goto fail;
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if (v4l2_fh_is_singular_file(file))
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init_waitqueue_head(&dev->read_queue);
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fail:
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mutex_unlock(&dev->lock);
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return err;
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}
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static int cadet_release(struct file *file)
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{
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struct cadet *dev = video_drvdata(file);
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mutex_lock(&dev->lock);
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if (v4l2_fh_is_singular_file(file) && dev->rdsstat) {
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del_timer_sync(&dev->readtimer);
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dev->rdsstat = 0;
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}
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v4l2_fh_release(file);
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mutex_unlock(&dev->lock);
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return 0;
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}
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static unsigned int cadet_poll(struct file *file, struct poll_table_struct *wait)
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{
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struct cadet *dev = video_drvdata(file);
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unsigned long req_events = poll_requested_events(wait);
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unsigned int res = v4l2_ctrl_poll(file, wait);
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poll_wait(file, &dev->read_queue, wait);
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if (dev->rdsstat == 0 && (req_events & (POLLIN | POLLRDNORM))) {
|
|
mutex_lock(&dev->lock);
|
|
if (dev->rdsstat == 0)
|
|
cadet_start_rds(dev);
|
|
mutex_unlock(&dev->lock);
|
|
}
|
|
if (cadet_has_rds_data(dev))
|
|
res |= POLLIN | POLLRDNORM;
|
|
return res;
|
|
}
|
|
|
|
|
|
static const struct v4l2_file_operations cadet_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = cadet_open,
|
|
.release = cadet_release,
|
|
.read = cadet_read,
|
|
.unlocked_ioctl = video_ioctl2,
|
|
.poll = cadet_poll,
|
|
};
|
|
|
|
static const struct v4l2_ioctl_ops cadet_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_enum_freq_bands = vidioc_enum_freq_bands,
|
|
.vidioc_log_status = v4l2_ctrl_log_status,
|
|
.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
|
|
.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
|
|
};
|
|
|
|
static const struct v4l2_ctrl_ops cadet_ctrl_ops = {
|
|
.s_ctrl = cadet_s_ctrl,
|
|
};
|
|
|
|
#ifdef CONFIG_PNP
|
|
|
|
static struct pnp_device_id cadet_pnp_devices[] = {
|
|
/* ADS Cadet AM/FM Radio Card */
|
|
{.id = "MSM0c24", .driver_data = 0},
|
|
{.id = ""}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(pnp, cadet_pnp_devices);
|
|
|
|
static int cadet_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
|
|
{
|
|
if (!dev)
|
|
return -ENODEV;
|
|
/* only support one device */
|
|
if (io > 0)
|
|
return -EBUSY;
|
|
|
|
if (!pnp_port_valid(dev, 0))
|
|
return -ENODEV;
|
|
|
|
io = pnp_port_start(dev, 0);
|
|
|
|
printk(KERN_INFO "radio-cadet: PnP reports device at %#x\n", io);
|
|
|
|
return io;
|
|
}
|
|
|
|
static struct pnp_driver cadet_pnp_driver = {
|
|
.name = "radio-cadet",
|
|
.id_table = cadet_pnp_devices,
|
|
.probe = cadet_pnp_probe,
|
|
.remove = NULL,
|
|
};
|
|
|
|
#else
|
|
static struct pnp_driver cadet_pnp_driver;
|
|
#endif
|
|
|
|
static void cadet_probe(struct cadet *dev)
|
|
{
|
|
static int iovals[8] = { 0x330, 0x332, 0x334, 0x336, 0x338, 0x33a, 0x33c, 0x33e };
|
|
int i;
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
dev->io = iovals[i];
|
|
if (request_region(dev->io, 2, "cadet-probe")) {
|
|
cadet_setfreq(dev, bands[1].rangelow);
|
|
if (cadet_getfreq(dev) == bands[1].rangelow) {
|
|
release_region(dev->io, 2);
|
|
return;
|
|
}
|
|
release_region(dev->io, 2);
|
|
}
|
|
}
|
|
dev->io = -1;
|
|
}
|
|
|
|
/*
|
|
* io should only be set if the user has used something like
|
|
* isapnp (the userspace program) to initialize this card for us
|
|
*/
|
|
|
|
static int __init cadet_init(void)
|
|
{
|
|
struct cadet *dev = &cadet_card;
|
|
struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
|
|
struct v4l2_ctrl_handler *hdl;
|
|
int res = -ENODEV;
|
|
|
|
strlcpy(v4l2_dev->name, "cadet", sizeof(v4l2_dev->name));
|
|
mutex_init(&dev->lock);
|
|
|
|
/* If a probe was requested then probe ISAPnP first (safest) */
|
|
if (io < 0)
|
|
pnp_register_driver(&cadet_pnp_driver);
|
|
dev->io = io;
|
|
|
|
/* If that fails then probe unsafely if probe is requested */
|
|
if (dev->io < 0)
|
|
cadet_probe(dev);
|
|
|
|
/* Else we bail out */
|
|
if (dev->io < 0) {
|
|
#ifdef MODULE
|
|
v4l2_err(v4l2_dev, "you must set an I/O address with io=0x330, 0x332, 0x334,\n");
|
|
v4l2_err(v4l2_dev, "0x336, 0x338, 0x33a, 0x33c or 0x33e\n");
|
|
#endif
|
|
goto fail;
|
|
}
|
|
if (!request_region(dev->io, 2, "cadet"))
|
|
goto fail;
|
|
|
|
res = v4l2_device_register(NULL, v4l2_dev);
|
|
if (res < 0) {
|
|
release_region(dev->io, 2);
|
|
v4l2_err(v4l2_dev, "could not register v4l2_device\n");
|
|
goto fail;
|
|
}
|
|
|
|
hdl = &dev->ctrl_handler;
|
|
v4l2_ctrl_handler_init(hdl, 2);
|
|
v4l2_ctrl_new_std(hdl, &cadet_ctrl_ops,
|
|
V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
|
|
v4l2_dev->ctrl_handler = hdl;
|
|
if (hdl->error) {
|
|
res = hdl->error;
|
|
v4l2_err(v4l2_dev, "Could not register controls\n");
|
|
goto err_hdl;
|
|
}
|
|
|
|
dev->is_fm_band = true;
|
|
dev->curfreq = bands[dev->is_fm_band].rangelow;
|
|
cadet_setfreq(dev, dev->curfreq);
|
|
strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
|
|
dev->vdev.v4l2_dev = v4l2_dev;
|
|
dev->vdev.fops = &cadet_fops;
|
|
dev->vdev.ioctl_ops = &cadet_ioctl_ops;
|
|
dev->vdev.release = video_device_release_empty;
|
|
dev->vdev.lock = &dev->lock;
|
|
video_set_drvdata(&dev->vdev, dev);
|
|
|
|
res = video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr);
|
|
if (res < 0)
|
|
goto err_hdl;
|
|
v4l2_info(v4l2_dev, "ADS Cadet Radio Card at 0x%x\n", dev->io);
|
|
return 0;
|
|
err_hdl:
|
|
v4l2_ctrl_handler_free(hdl);
|
|
v4l2_device_unregister(v4l2_dev);
|
|
release_region(dev->io, 2);
|
|
fail:
|
|
pnp_unregister_driver(&cadet_pnp_driver);
|
|
return res;
|
|
}
|
|
|
|
static void __exit cadet_exit(void)
|
|
{
|
|
struct cadet *dev = &cadet_card;
|
|
|
|
video_unregister_device(&dev->vdev);
|
|
v4l2_ctrl_handler_free(&dev->ctrl_handler);
|
|
v4l2_device_unregister(&dev->v4l2_dev);
|
|
outb(7, dev->io); /* Mute */
|
|
outb(0x00, dev->io + 1);
|
|
release_region(dev->io, 2);
|
|
pnp_unregister_driver(&cadet_pnp_driver);
|
|
}
|
|
|
|
module_init(cadet_init);
|
|
module_exit(cadet_exit);
|
|
|