462 lines
10 KiB
C
462 lines
10 KiB
C
/* SF16FMR2 radio driver for Linux radio support
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* heavily based on fmi driver...
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* (c) 2000-2002 Ziglio Frediano, freddy77@angelfire.com
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*
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* Notes on the hardware
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*
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* Frequency control is done digitally -- ie out(port,encodefreq(95.8));
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* No volume control - only mute/unmute - you have to use line volume
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*
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* For read stereo/mono you must wait 0.1 sec after set frequency and
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* card unmuted so I set frequency on unmute
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* Signal handling seem to work only on autoscanning (not implemented)
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*
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* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
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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> /* kernel radio structs */
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#include <linux/mutex.h>
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#include <linux/version.h> /* for KERNEL_VERSION MACRO */
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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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MODULE_AUTHOR("Ziglio Frediano, freddy77@angelfire.com");
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MODULE_DESCRIPTION("A driver for the SF16FMR2 radio.");
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MODULE_LICENSE("GPL");
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static int io = 0x384;
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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 the SF16FMR2 card (should be 0x384, if do not work try 0x284)");
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module_param(radio_nr, int, 0);
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#define RADIO_VERSION KERNEL_VERSION(0,0,2)
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#define AUD_VOL_INDEX 1
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#undef DEBUG
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//#define DEBUG 1
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#ifdef DEBUG
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# define debug_print(s) printk s
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#else
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# define debug_print(s)
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#endif
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/* this should be static vars for module size */
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struct fmr2
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{
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struct v4l2_device v4l2_dev;
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struct video_device vdev;
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struct mutex lock;
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int io;
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int curvol; /* 0-15 */
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int mute;
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int stereo; /* card is producing stereo audio */
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unsigned long curfreq; /* freq in kHz */
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int card_type;
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};
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static struct fmr2 fmr2_card;
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/* hw precision is 12.5 kHz
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* It is only useful to give freq in interval of 200 (=0.0125Mhz),
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* other bits will be truncated
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*/
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#define RSF16_ENCODE(x) ((x) / 200 + 856)
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#define RSF16_MINFREQ (87 * 16000)
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#define RSF16_MAXFREQ (108 * 16000)
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static inline void wait(int n, int io)
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{
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for (; n; --n)
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inb(io);
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}
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static void outbits(int bits, unsigned int data, int nWait, int io)
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{
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int bit;
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for (; --bits >= 0;) {
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bit = (data >> bits) & 1;
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outb(bit, io);
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wait(nWait, io);
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outb(bit | 2, io);
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wait(nWait, io);
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outb(bit, io);
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wait(nWait, io);
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}
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}
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static inline void fmr2_mute(int io)
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{
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outb(0x00, io);
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wait(4, io);
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}
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static inline void fmr2_unmute(int io)
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{
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outb(0x04, io);
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wait(4, io);
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}
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static inline int fmr2_stereo_mode(int io)
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{
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int n = inb(io);
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outb(6, io);
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inb(io);
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n = ((n >> 3) & 1) ^ 1;
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debug_print((KERN_DEBUG "stereo: %d\n", n));
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return n;
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}
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static int fmr2_product_info(struct fmr2 *dev)
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{
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int n = inb(dev->io);
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n &= 0xC1;
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if (n == 0) {
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/* this should support volume set */
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dev->card_type = 12;
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return 0;
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}
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/* not volume (mine is 11) */
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dev->card_type = (n == 128) ? 11 : 0;
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return n;
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}
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static inline int fmr2_getsigstr(struct fmr2 *dev)
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{
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/* !!! works only if scanning freq */
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int res = 0xffff;
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outb(5, dev->io);
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wait(4, dev->io);
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if (!(inb(dev->io) & 1))
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res = 0;
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debug_print((KERN_DEBUG "signal: %d\n", res));
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return res;
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}
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/* set frequency and unmute card */
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static int fmr2_setfreq(struct fmr2 *dev)
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{
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unsigned long freq = dev->curfreq;
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fmr2_mute(dev->io);
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/* 0x42 for mono output
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* 0x102 forward scanning
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* 0x182 scansione avanti
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*/
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outbits(9, 0x2, 3, dev->io);
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outbits(16, RSF16_ENCODE(freq), 2, dev->io);
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fmr2_unmute(dev->io);
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/* wait 0.11 sec */
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msleep(110);
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/* NOTE if mute this stop radio
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you must set freq on unmute */
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dev->stereo = fmr2_stereo_mode(dev->io);
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return 0;
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}
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/* !!! not tested, in my card this does't work !!! */
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static int fmr2_setvolume(struct fmr2 *dev)
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{
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int vol[16] = { 0x021, 0x084, 0x090, 0x104,
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0x110, 0x204, 0x210, 0x402,
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0x404, 0x408, 0x410, 0x801,
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0x802, 0x804, 0x808, 0x810 };
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int i, a;
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int n = vol[dev->curvol & 0x0f];
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if (dev->card_type != 11)
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return 1;
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for (i = 12; --i >= 0; ) {
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a = ((n >> i) & 1) << 6; /* if (a==0) a = 0; else a = 0x40; */
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outb(a | 4, dev->io);
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wait(4, dev->io);
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outb(a | 0x24, dev->io);
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wait(4, dev->io);
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outb(a | 4, dev->io);
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wait(4, dev->io);
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}
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for (i = 6; --i >= 0; ) {
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a = ((0x18 >> i) & 1) << 6;
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outb(a | 4, dev->io);
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wait(4, dev->io);
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outb(a | 0x24, dev->io);
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wait(4, dev->io);
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outb(a | 4, dev->io);
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wait(4, dev->io);
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}
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wait(4, dev->io);
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outb(0x14, dev->io);
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return 0;
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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, "radio-sf16fmr2", sizeof(v->driver));
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strlcpy(v->card, "SF16-FMR2 radio", sizeof(v->card));
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strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
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v->version = RADIO_VERSION;
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v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
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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 fmr2 *fmr2 = video_drvdata(file);
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if (v->index > 0)
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return -EINVAL;
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strlcpy(v->name, "FM", sizeof(v->name));
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v->type = V4L2_TUNER_RADIO;
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v->rangelow = RSF16_MINFREQ;
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v->rangehigh = RSF16_MAXFREQ;
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v->rxsubchans = fmr2->stereo ? V4L2_TUNER_SUB_STEREO :
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V4L2_TUNER_SUB_MONO;
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v->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW;
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v->audmode = V4L2_TUNER_MODE_STEREO;
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mutex_lock(&fmr2->lock);
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v->signal = fmr2_getsigstr(fmr2);
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mutex_unlock(&fmr2->lock);
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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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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_s_frequency(struct file *file, void *priv,
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struct v4l2_frequency *f)
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{
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struct fmr2 *fmr2 = video_drvdata(file);
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if (f->frequency < RSF16_MINFREQ ||
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f->frequency > RSF16_MAXFREQ)
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return -EINVAL;
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/* rounding in steps of 200 to match the freq
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that will be used */
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fmr2->curfreq = (f->frequency / 200) * 200;
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/* set card freq (if not muted) */
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if (fmr2->curvol && !fmr2->mute) {
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mutex_lock(&fmr2->lock);
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fmr2_setfreq(fmr2);
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mutex_unlock(&fmr2->lock);
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}
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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 fmr2 *fmr2 = video_drvdata(file);
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f->type = V4L2_TUNER_RADIO;
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f->frequency = fmr2->curfreq;
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return 0;
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}
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static int vidioc_queryctrl(struct file *file, void *priv,
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struct v4l2_queryctrl *qc)
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{
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struct fmr2 *fmr2 = video_drvdata(file);
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switch (qc->id) {
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case V4L2_CID_AUDIO_MUTE:
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return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
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case V4L2_CID_AUDIO_VOLUME:
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/* Only card_type == 11 implements volume */
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if (fmr2->card_type == 11)
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return v4l2_ctrl_query_fill(qc, 0, 15, 1, 0);
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return v4l2_ctrl_query_fill(qc, 0, 1, 1, 0);
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}
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return -EINVAL;
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}
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static int vidioc_g_ctrl(struct file *file, void *priv,
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struct v4l2_control *ctrl)
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{
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struct fmr2 *fmr2 = video_drvdata(file);
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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ctrl->value = fmr2->mute;
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return 0;
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case V4L2_CID_AUDIO_VOLUME:
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ctrl->value = fmr2->curvol;
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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 vidioc_s_ctrl(struct file *file, void *priv,
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struct v4l2_control *ctrl)
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{
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struct fmr2 *fmr2 = video_drvdata(file);
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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fmr2->mute = ctrl->value;
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break;
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case V4L2_CID_AUDIO_VOLUME:
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fmr2->curvol = ctrl->value;
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break;
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default:
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return -EINVAL;
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}
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#ifdef DEBUG
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if (fmr2->curvol && !fmr2->mute)
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printk(KERN_DEBUG "unmute\n");
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else
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printk(KERN_DEBUG "mute\n");
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#endif
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mutex_lock(&fmr2->lock);
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if (fmr2->curvol && !fmr2->mute) {
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fmr2_setvolume(fmr2);
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/* Set frequency and unmute card */
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fmr2_setfreq(fmr2);
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} else
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fmr2_mute(fmr2->io);
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mutex_unlock(&fmr2->lock);
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return 0;
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}
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static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
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{
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*i = 0;
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return 0;
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}
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static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
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{
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return i ? -EINVAL : 0;
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}
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static int vidioc_g_audio(struct file *file, void *priv,
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struct v4l2_audio *a)
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{
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a->index = 0;
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strlcpy(a->name, "Radio", sizeof(a->name));
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a->capability = V4L2_AUDCAP_STEREO;
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return 0;
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}
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static int vidioc_s_audio(struct file *file, void *priv,
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struct v4l2_audio *a)
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{
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return a->index ? -EINVAL : 0;
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}
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static const struct v4l2_file_operations fmr2_fops = {
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.owner = THIS_MODULE,
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.ioctl = video_ioctl2,
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};
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static const struct v4l2_ioctl_ops fmr2_ioctl_ops = {
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.vidioc_querycap = vidioc_querycap,
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.vidioc_g_tuner = vidioc_g_tuner,
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.vidioc_s_tuner = vidioc_s_tuner,
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.vidioc_g_audio = vidioc_g_audio,
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.vidioc_s_audio = vidioc_s_audio,
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.vidioc_g_input = vidioc_g_input,
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.vidioc_s_input = vidioc_s_input,
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.vidioc_g_frequency = vidioc_g_frequency,
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.vidioc_s_frequency = vidioc_s_frequency,
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.vidioc_queryctrl = vidioc_queryctrl,
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.vidioc_g_ctrl = vidioc_g_ctrl,
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.vidioc_s_ctrl = vidioc_s_ctrl,
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};
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static int __init fmr2_init(void)
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{
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struct fmr2 *fmr2 = &fmr2_card;
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struct v4l2_device *v4l2_dev = &fmr2->v4l2_dev;
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int res;
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strlcpy(v4l2_dev->name, "sf16fmr2", sizeof(v4l2_dev->name));
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fmr2->io = io;
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fmr2->stereo = 1;
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mutex_init(&fmr2->lock);
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if (!request_region(fmr2->io, 2, "sf16fmr2")) {
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v4l2_err(v4l2_dev, "request_region failed!\n");
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return -EBUSY;
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}
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res = v4l2_device_register(NULL, v4l2_dev);
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if (res < 0) {
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release_region(fmr2->io, 2);
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v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
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return res;
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}
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strlcpy(fmr2->vdev.name, v4l2_dev->name, sizeof(fmr2->vdev.name));
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fmr2->vdev.v4l2_dev = v4l2_dev;
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fmr2->vdev.fops = &fmr2_fops;
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fmr2->vdev.ioctl_ops = &fmr2_ioctl_ops;
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fmr2->vdev.release = video_device_release_empty;
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video_set_drvdata(&fmr2->vdev, fmr2);
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if (video_register_device(&fmr2->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
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v4l2_device_unregister(v4l2_dev);
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release_region(fmr2->io, 2);
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return -EINVAL;
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}
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v4l2_info(v4l2_dev, "SF16FMR2 radio card driver at 0x%x.\n", fmr2->io);
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/* mute card - prevents noisy bootups */
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mutex_lock(&fmr2->lock);
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fmr2_mute(fmr2->io);
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fmr2_product_info(fmr2);
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mutex_unlock(&fmr2->lock);
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debug_print((KERN_DEBUG "card_type %d\n", fmr2->card_type));
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return 0;
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}
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static void __exit fmr2_exit(void)
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{
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struct fmr2 *fmr2 = &fmr2_card;
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video_unregister_device(&fmr2->vdev);
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v4l2_device_unregister(&fmr2->v4l2_dev);
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release_region(fmr2->io, 2);
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}
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module_init(fmr2_init);
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module_exit(fmr2_exit);
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#ifndef MODULE
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static int __init fmr2_setup_io(char *str)
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{
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get_option(&str, &io);
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return 1;
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}
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__setup("sf16fmr2=", fmr2_setup_io);
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#endif
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