333 lines
8.6 KiB
C
333 lines
8.6 KiB
C
/* Maestro PCI sound card radio driver for Linux support
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* (c) 2000 A. Tlalka, atlka@pg.gda.pl
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* Notes on the hardware
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*
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* + Frequency control is done digitally
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* + No volume control - only mute/unmute - you have to use Aux line volume
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* control on Maestro card to set the volume
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* + Radio status (tuned/not_tuned and stereo/mono) is valid some time after
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* frequency setting (>100ms) and only when the radio is unmuted.
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* version 0.02
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* + io port is automatically detected - only the first radio is used
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* version 0.03
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* + thread access locking additions
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* version 0.04
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* + code improvements
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* + VIDEO_TUNER_LOW is permanent
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <asm/semaphore.h>
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#include <linux/pci.h>
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#include <linux/videodev.h>
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#define DRIVER_VERSION "0.04"
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#define PCI_VENDOR_ESS 0x125D
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#define PCI_DEVICE_ID_ESS_ESS1968 0x1968 /* Maestro 2 */
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#define PCI_DEVICE_ID_ESS_ESS1978 0x1978 /* Maestro 2E */
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#define GPIO_DATA 0x60 /* port offset from ESS_IO_BASE */
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#define IO_MASK 4 /* mask register offset from GPIO_DATA
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bits 1=unmask write to given bit */
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#define IO_DIR 8 /* direction register offset from GPIO_DATA
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bits 0/1=read/write direction */
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#define GPIO6 0x0040 /* mask bits for GPIO lines */
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#define GPIO7 0x0080
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#define GPIO8 0x0100
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#define GPIO9 0x0200
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#define STR_DATA GPIO6 /* radio TEA5757 pins and GPIO bits */
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#define STR_CLK GPIO7
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#define STR_WREN GPIO8
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#define STR_MOST GPIO9
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#define FREQ_LO 50*16000
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#define FREQ_HI 150*16000
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#define FREQ_IF 171200 /* 10.7*16000 */
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#define FREQ_STEP 200 /* 12.5*16 */
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#define FREQ2BITS(x) ((((unsigned int)(x)+FREQ_IF+(FREQ_STEP<<1))\
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/(FREQ_STEP<<2))<<2) /* (x==fmhz*16*1000) -> bits */
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#define BITS2FREQ(x) ((x) * FREQ_STEP - FREQ_IF)
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static int radio_nr = -1;
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module_param(radio_nr, int, 0);
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static int radio_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg);
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static struct file_operations maestro_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 = radio_ioctl,
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.llseek = no_llseek,
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};
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static struct video_device maestro_radio=
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{
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.owner = THIS_MODULE,
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.name = "Maestro radio",
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.type = VID_TYPE_TUNER,
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.hardware = VID_HARDWARE_SF16MI,
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.fops = &maestro_fops,
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};
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static struct radio_device
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{
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__u16 io, /* base of Maestro card radio io (GPIO_DATA)*/
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muted, /* VIDEO_AUDIO_MUTE */
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stereo, /* VIDEO_TUNER_STEREO_ON */
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tuned; /* signal strength (0 or 0xffff) */
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struct semaphore lock;
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} radio_unit = {0, 0, 0, 0, };
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static __u32 radio_bits_get(struct radio_device *dev)
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{
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register __u16 io=dev->io, l, rdata;
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register __u32 data=0;
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__u16 omask;
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omask = inw(io + IO_MASK);
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outw(~(STR_CLK | STR_WREN), io + IO_MASK);
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outw(0, io);
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udelay(16);
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for (l=24;l--;) {
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outw(STR_CLK, io); /* HI state */
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udelay(2);
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if(!l)
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dev->tuned = inw(io) & STR_MOST ? 0 : 0xffff;
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outw(0, io); /* LO state */
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udelay(2);
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data <<= 1; /* shift data */
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rdata = inw(io);
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if(!l)
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dev->stereo = rdata & STR_MOST ?
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0 : VIDEO_TUNER_STEREO_ON;
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else
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if(rdata & STR_DATA)
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data++;
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udelay(2);
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}
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if(dev->muted)
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outw(STR_WREN, io);
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udelay(4);
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outw(omask, io + IO_MASK);
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return data & 0x3ffe;
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}
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static void radio_bits_set(struct radio_device *dev, __u32 data)
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{
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register __u16 io=dev->io, l, bits;
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__u16 omask, odir;
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omask = inw(io + IO_MASK);
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odir = (inw(io + IO_DIR) & ~STR_DATA) | (STR_CLK | STR_WREN);
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outw(odir | STR_DATA, io + IO_DIR);
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outw(~(STR_DATA | STR_CLK | STR_WREN), io + IO_MASK);
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udelay(16);
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for (l=25;l;l--) {
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bits = ((data >> 18) & STR_DATA) | STR_WREN ;
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data <<= 1; /* shift data */
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outw(bits, io); /* start strobe */
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udelay(2);
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outw(bits | STR_CLK, io); /* HI level */
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udelay(2);
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outw(bits, io); /* LO level */
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udelay(4);
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}
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if(!dev->muted)
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outw(0, io);
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udelay(4);
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outw(omask, io + IO_MASK);
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outw(odir, io + IO_DIR);
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msleep(125);
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}
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inline static int radio_function(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 radio_device *card=dev->priv;
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switch(cmd) {
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case VIDIOCGCAP: {
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struct video_capability *v = arg;
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memset(v,0,sizeof(*v));
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strcpy(v->name, "Maestro radio");
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v->type=VID_TYPE_TUNER;
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v->channels=v->audios=1;
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return 0;
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}
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case VIDIOCGTUNER: {
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struct video_tuner *v = arg;
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if(v->tuner)
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return -EINVAL;
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(void)radio_bits_get(card);
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v->flags = VIDEO_TUNER_LOW | card->stereo;
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v->signal = card->tuned;
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strcpy(v->name, "FM");
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v->rangelow = FREQ_LO;
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v->rangehigh = FREQ_HI;
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v->mode = VIDEO_MODE_AUTO;
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return 0;
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}
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case VIDIOCSTUNER: {
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struct video_tuner *v = arg;
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if(v->tuner!=0)
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return -EINVAL;
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return 0;
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}
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case VIDIOCGFREQ: {
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unsigned long *freq = arg;
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*freq = BITS2FREQ(radio_bits_get(card));
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return 0;
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}
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case VIDIOCSFREQ: {
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unsigned long *freq = arg;
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if (*freq<FREQ_LO || *freq>FREQ_HI )
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return -EINVAL;
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radio_bits_set(card, FREQ2BITS(*freq));
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return 0;
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}
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case VIDIOCGAUDIO: {
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struct video_audio *v = arg;
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memset(v,0,sizeof(*v));
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strcpy(v->name, "Radio");
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v->flags=VIDEO_AUDIO_MUTABLE | card->muted;
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v->mode=VIDEO_SOUND_STEREO;
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return 0;
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}
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case VIDIOCSAUDIO: {
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struct video_audio *v = arg;
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if(v->audio)
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return -EINVAL;
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{
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register __u16 io=card->io;
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register __u16 omask = inw(io + IO_MASK);
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outw(~STR_WREN, io + IO_MASK);
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outw((card->muted = v->flags & VIDEO_AUDIO_MUTE)
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? STR_WREN : 0, io);
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udelay(4);
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outw(omask, io + IO_MASK);
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msleep(125);
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return 0;
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}
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}
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case VIDIOCGUNIT: {
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struct video_unit *v = arg;
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v->video=VIDEO_NO_UNIT;
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v->vbi=VIDEO_NO_UNIT;
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v->radio=dev->minor;
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v->audio=0;
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v->teletext=VIDEO_NO_UNIT;
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return 0;
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}
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default: return -ENOIOCTLCMD;
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}
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}
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static int radio_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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struct video_device *dev = video_devdata(file);
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struct radio_device *card=dev->priv;
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int ret;
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down(&card->lock);
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ret = video_usercopy(inode, file, cmd, arg, radio_function);
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up(&card->lock);
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return ret;
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}
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static __u16 radio_install(struct pci_dev *pcidev);
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MODULE_AUTHOR("Adam Tlalka, atlka@pg.gda.pl");
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MODULE_DESCRIPTION("Radio driver for the Maestro PCI sound card radio.");
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MODULE_LICENSE("GPL");
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static void __exit maestro_radio_exit(void)
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{
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video_unregister_device(&maestro_radio);
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}
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static int __init maestro_radio_init(void)
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{
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register __u16 found=0;
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struct pci_dev *pcidev = NULL;
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while(!found && (pcidev = pci_find_device(PCI_VENDOR_ESS,
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PCI_DEVICE_ID_ESS_ESS1968,
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pcidev)))
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found |= radio_install(pcidev);
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while(!found && (pcidev = pci_find_device(PCI_VENDOR_ESS,
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PCI_DEVICE_ID_ESS_ESS1978,
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pcidev)))
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found |= radio_install(pcidev);
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if(!found) {
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printk(KERN_INFO "radio-maestro: no devices found.\n");
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return -ENODEV;
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}
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return 0;
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}
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module_init(maestro_radio_init);
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module_exit(maestro_radio_exit);
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inline static __u16 radio_power_on(struct radio_device *dev)
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{
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register __u16 io=dev->io;
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register __u32 ofreq;
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__u16 omask, odir;
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omask = inw(io + IO_MASK);
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odir = (inw(io + IO_DIR) & ~STR_DATA) | (STR_CLK | STR_WREN);
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outw(odir & ~STR_WREN, io + IO_DIR);
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dev->muted = inw(io) & STR_WREN ? 0 : VIDEO_AUDIO_MUTE;
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outw(odir, io + IO_DIR);
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outw(~(STR_WREN | STR_CLK), io + IO_MASK);
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outw(dev->muted ? 0 : STR_WREN, io);
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udelay(16);
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outw(omask, io + IO_MASK);
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ofreq = radio_bits_get(dev);
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if((ofreq<FREQ2BITS(FREQ_LO)) || (ofreq>FREQ2BITS(FREQ_HI)))
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ofreq = FREQ2BITS(FREQ_LO);
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radio_bits_set(dev, ofreq);
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return (ofreq == radio_bits_get(dev));
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}
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static __u16 radio_install(struct pci_dev *pcidev)
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{
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if(((pcidev->class >> 8) & 0xffff) != PCI_CLASS_MULTIMEDIA_AUDIO)
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return 0;
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radio_unit.io = pcidev->resource[0].start + GPIO_DATA;
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maestro_radio.priv = &radio_unit;
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init_MUTEX(&radio_unit.lock);
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if(radio_power_on(&radio_unit)) {
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if(video_register_device(&maestro_radio, VFL_TYPE_RADIO, radio_nr)==-1) {
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printk("radio-maestro: can't register device!");
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return 0;
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}
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printk(KERN_INFO "radio-maestro: version "
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DRIVER_VERSION
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" time "
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__TIME__ " "
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__DATE__
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"\n");
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printk(KERN_INFO "radio-maestro: radio chip initialized\n");
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return 1;
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} else
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return 0;
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}
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