493 lines
11 KiB
C
493 lines
11 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 <asm/io.h> /* outb, outb_p */
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#include <asm/uaccess.h> /* copy to/from user */
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#include <linux/videodev2.h> /* kernel radio structs */
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#include <media/v4l2-common.h>
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#include <linux/mutex.h>
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static struct mutex lock;
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#include <linux/version.h> /* for KERNEL_VERSION MACRO */
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#define RADIO_VERSION KERNEL_VERSION(0,0,2)
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static struct v4l2_queryctrl radio_qctrl[] = {
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{
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.id = V4L2_CID_AUDIO_MUTE,
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.name = "Mute",
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.minimum = 0,
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.maximum = 1,
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.default_value = 1,
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.type = V4L2_CTRL_TYPE_BOOLEAN,
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},{
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.id = V4L2_CID_AUDIO_VOLUME,
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.name = "Volume",
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.minimum = 0,
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.maximum = 65535,
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.step = 1<<12,
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.default_value = 0xff,
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.type = V4L2_CTRL_TYPE_INTEGER,
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}
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};
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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_device
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{
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int port;
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int curvol; /* 0-65535, if not volume 0 or 65535 */
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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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__u32 flags;
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};
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static int io = 0x384;
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static int radio_nr = -1;
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/* hw precision is 12.5 kHz
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* It is only useful to give freq in intervall 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 port)
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{
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for (;n;--n) inb(port);
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}
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static void outbits(int bits, unsigned int data, int nWait, int port)
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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,port);
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wait(nWait,port);
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outb(bit|2,port);
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wait(nWait,port);
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outb(bit,port);
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wait(nWait,port);
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}
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}
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static inline void fmr2_mute(int port)
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{
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outb(0x00, port);
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wait(4,port);
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}
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static inline void fmr2_unmute(int port)
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{
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outb(0x04, port);
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wait(4,port);
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}
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static inline int fmr2_stereo_mode(int port)
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{
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int n = inb(port);
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outb(6,port);
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inb(port);
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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_device *dev)
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{
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int n = inb(dev->port);
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n &= 0xC1;
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if (n == 0)
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{
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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_device *dev)
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{
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/* !!! work only if scanning freq */
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int port = dev->port, res = 0xffff;
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outb(5,port);
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wait(4,port);
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if (!(inb(port)&1)) 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_device *dev)
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{
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int port = dev->port;
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unsigned long freq = dev->curfreq;
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fmr2_mute(port);
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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,port);
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outbits(16,RSF16_ENCODE(freq),2,port);
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fmr2_unmute(port);
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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(port);
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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_device *dev)
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{
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int i,a,n, port = dev->port;
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if (dev->card_type != 11) return 1;
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switch( (dev->curvol+(1<<11)) >> 12 )
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{
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case 0: case 1: n = 0x21; break;
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case 2: n = 0x84; break;
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case 3: n = 0x90; break;
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case 4: n = 0x104; break;
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case 5: n = 0x110; break;
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case 6: n = 0x204; break;
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case 7: n = 0x210; break;
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case 8: n = 0x402; break;
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case 9: n = 0x404; break;
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default:
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case 10: n = 0x408; break;
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case 11: n = 0x410; break;
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case 12: n = 0x801; break;
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case 13: n = 0x802; break;
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case 14: n = 0x804; break;
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case 15: n = 0x808; break;
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case 16: n = 0x810; break;
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}
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for(i=12;--i>=0;)
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{
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a = ((n >> i) & 1) << 6; /* if (a=0) a= 0; else a= 0x40; */
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outb(a|4, port);
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wait(4,port);
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outb(a|0x24, port);
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wait(4,port);
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outb(a|4, port);
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wait(4,port);
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}
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for(i=6;--i>=0;)
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{
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a = ((0x18 >> i) & 1) << 6;
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outb(a|4, port);
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wait(4,port);
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outb(a|0x24, port);
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wait(4,port);
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outb(a|4, port);
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wait(4,port);
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}
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wait(4,port);
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outb(0x14, port);
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return 0;
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}
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static int fmr2_do_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, void *arg)
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{
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struct video_device *dev = video_devdata(file);
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struct fmr2_device *fmr2 = dev->priv;
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debug_print((KERN_DEBUG "freq %ld flags %d vol %d mute %d "
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"stereo %d type %d\n",
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fmr2->curfreq, fmr2->flags, fmr2->curvol, fmr2->mute,
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fmr2->stereo, fmr2->card_type));
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switch(cmd)
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{
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case VIDIOC_QUERYCAP:
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{
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struct v4l2_capability *v = arg;
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memset(v,0,sizeof(*v));
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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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sprintf(v->bus_info,"ISA");
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v->version = RADIO_VERSION;
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v->capabilities = V4L2_CAP_TUNER;
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return 0;
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}
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case VIDIOC_G_TUNER:
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{
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struct v4l2_tuner *v = arg;
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int mult;
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if (v->index > 0)
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return -EINVAL;
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memset(v,0,sizeof(*v));
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strcpy(v->name, "FM");
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v->type = V4L2_TUNER_RADIO;
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mult = (fmr2->flags & V4L2_TUNER_CAP_LOW) ? 1 : 1000;
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v->rangelow = RSF16_MINFREQ/mult;
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v->rangehigh = RSF16_MAXFREQ/mult;
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v->rxsubchans =V4L2_TUNER_SUB_MONO | V4L2_TUNER_MODE_STEREO;
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v->capability=fmr2->flags&V4L2_TUNER_CAP_LOW;
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v->audmode = fmr2->stereo ? V4L2_TUNER_MODE_STEREO:
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V4L2_TUNER_MODE_MONO;
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mutex_lock(&lock);
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v->signal = fmr2_getsigstr(fmr2);
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mutex_unlock(&lock);
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return 0;
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}
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case VIDIOC_S_TUNER:
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{
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struct v4l2_tuner *v = arg;
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if (v->index > 0)
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return -EINVAL;
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return 0;
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}
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case VIDIOC_S_FREQUENCY:
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{
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struct v4l2_frequency *f = arg;
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if (!(fmr2->flags & V4L2_TUNER_CAP_LOW))
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f->frequency *= 1000;
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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 th 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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{
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mutex_lock(&lock);
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fmr2_setfreq(fmr2);
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mutex_unlock(&lock);
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}
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return 0;
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}
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case VIDIOC_G_FREQUENCY:
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{
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struct v4l2_frequency *f = arg;
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f->type = V4L2_TUNER_RADIO;
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f->frequency = fmr2->curfreq;
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if (!(fmr2->flags & V4L2_TUNER_CAP_LOW))
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f->frequency /= 1000;
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return 0;
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}
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case VIDIOC_QUERYCTRL:
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{
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struct v4l2_queryctrl *qc = arg;
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int i;
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for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
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if ((fmr2->card_type != 11)
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&& V4L2_CID_AUDIO_VOLUME)
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radio_qctrl[i].step=65535;
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if (qc->id && qc->id == radio_qctrl[i].id) {
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memcpy(qc, &(radio_qctrl[i]),
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sizeof(*qc));
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return (0);
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}
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}
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return -EINVAL;
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}
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case VIDIOC_G_CTRL:
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{
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struct v4l2_control *ctrl= arg;
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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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case VIDIOC_S_CTRL:
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{
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struct v4l2_control *ctrl= arg;
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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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if (fmr2->card_type != 11) {
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if (!fmr2->mute) {
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fmr2->curvol = 65535;
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} else {
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fmr2->curvol = 0;
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}
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}
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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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if (fmr2->card_type != 11) {
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if (fmr2->curvol) {
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fmr2->curvol = 65535;
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fmr2->mute = 0;
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} else {
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fmr2->curvol = 0;
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fmr2->mute = 1;
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}
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}
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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(&lock);
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if (fmr2->curvol && !fmr2->mute) {
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fmr2_setvolume(fmr2);
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fmr2_setfreq(fmr2);
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} else
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fmr2_mute(fmr2->port);
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mutex_unlock(&lock);
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return (0);
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}
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default:
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return v4l_compat_translate_ioctl(inode,file,cmd,arg,
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fmr2_do_ioctl);
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}
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}
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static int fmr2_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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return video_usercopy(inode, file, cmd, arg, fmr2_do_ioctl);
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}
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static struct fmr2_device fmr2_unit;
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static struct file_operations fmr2_fops = {
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.owner = THIS_MODULE,
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.open = video_exclusive_open,
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.release = video_exclusive_release,
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.ioctl = fmr2_ioctl,
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.compat_ioctl = v4l_compat_ioctl32,
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.llseek = no_llseek,
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};
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static struct video_device fmr2_radio=
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{
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.owner = THIS_MODULE,
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.name = "SF16FMR2 radio",
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. type = VID_TYPE_TUNER,
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.hardware = 0,
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.fops = &fmr2_fops,
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};
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static int __init fmr2_init(void)
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{
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fmr2_unit.port = io;
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fmr2_unit.curvol = 0;
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fmr2_unit.mute = 0;
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fmr2_unit.curfreq = 0;
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fmr2_unit.stereo = 1;
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fmr2_unit.flags = V4L2_TUNER_CAP_LOW;
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fmr2_unit.card_type = 0;
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fmr2_radio.priv = &fmr2_unit;
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mutex_init(&lock);
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if (request_region(io, 2, "sf16fmr2"))
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{
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printk(KERN_ERR "fmr2: port 0x%x already in use\n", io);
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return -EBUSY;
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}
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if(video_register_device(&fmr2_radio, VFL_TYPE_RADIO, radio_nr)==-1)
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{
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release_region(io, 2);
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return -EINVAL;
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}
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printk(KERN_INFO "SF16FMR2 radio card driver at 0x%x.\n", io);
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/* mute card - prevents noisy bootups */
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mutex_lock(&lock);
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fmr2_mute(io);
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fmr2_product_info(&fmr2_unit);
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mutex_unlock(&lock);
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debug_print((KERN_DEBUG "card_type %d\n", fmr2_unit.card_type));
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return 0;
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}
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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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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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static void __exit fmr2_cleanup_module(void)
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{
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video_unregister_device(&fmr2_radio);
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release_region(io,2);
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}
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module_init(fmr2_init);
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module_exit(fmr2_cleanup_module);
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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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