radio-maestro.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:9k
- /* Maestro PCI sound card radio driver for Linux support
- * (c) 2000 A. Tlalka, atlka@pg.gda.pl
- * Notes on the hardware
- *
- * + Frequency control is done digitally
- * + No volume control - only mute/unmute - you have to use Aux line volume
- * control on Maestro card to set the volume
- * + Radio status (tuned/not_tuned and stereo/mono) is valid some time after
- * frequency setting (>100ms) and only when the radio is unmuted.
- * version 0.02
- * + io port is automatically detected - only the first radio is used
- * version 0.03
- * + thread access locking additions
- * version 0.04
- * + code improvements
- * + VIDEO_TUNER_LOW is permanent
- */
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/ioport.h>
- #include <linux/delay.h>
- #include <linux/sched.h>
- #include <asm/io.h>
- #include <asm/uaccess.h>
- #include <asm/semaphore.h>
- #include <linux/pci.h>
- #include <linux/videodev.h>
- #define DRIVER_VERSION "0.04"
- #define PCI_VENDOR_ESS 0x125D
- #define PCI_DEVICE_ID_ESS_ESS1968 0x1968 /* Maestro 2 */
- #define PCI_DEVICE_ID_ESS_ESS1978 0x1978 /* Maestro 2E */
- #define GPIO_DATA 0x60 /* port offset from ESS_IO_BASE */
- #define IO_MASK 4 /* mask register offset from GPIO_DATA
- bits 1=unmask write to given bit */
- #define IO_DIR 8 /* direction register offset from GPIO_DATA
- bits 0/1=read/write direction */
- #define GPIO6 0x0040 /* mask bits for GPIO lines */
- #define GPIO7 0x0080
- #define GPIO8 0x0100
- #define GPIO9 0x0200
- #define STR_DATA GPIO6 /* radio TEA5757 pins and GPIO bits */
- #define STR_CLK GPIO7
- #define STR_WREN GPIO8
- #define STR_MOST GPIO9
- #define FREQ_LO 50*16000
- #define FREQ_HI 150*16000
- #define FREQ_IF 171200 /* 10.7*16000 */
- #define FREQ_STEP 200 /* 12.5*16 */
- #define FREQ2BITS(x) ((((unsigned int)(x)+FREQ_IF+(FREQ_STEP<<1))
- /(FREQ_STEP<<2))<<2) /* (x==fmhz*16*1000) -> bits */
- #define BITS2FREQ(x) ((x) * FREQ_STEP - FREQ_IF)
- static int radio_nr = -1;
- MODULE_PARM(radio_nr, "i");
- static int radio_open(struct video_device *, int);
- static int radio_ioctl(struct video_device *, unsigned int, void *);
- static void radio_close(struct video_device *);
- static struct video_device maestro_radio=
- {
- owner: THIS_MODULE,
- name: "Maestro radio",
- type: VID_TYPE_TUNER,
- hardware: VID_HARDWARE_SF16MI,
- open: radio_open,
- close: radio_close,
- ioctl: radio_ioctl,
- };
- static struct radio_device
- {
- __u16 io, /* base of Maestro card radio io (GPIO_DATA)*/
- muted, /* VIDEO_AUDIO_MUTE */
- stereo, /* VIDEO_TUNER_STEREO_ON */
- tuned; /* signal strength (0 or 0xffff) */
- struct semaphore lock;
- } radio_unit = {0, 0, 0, 0, };
- static int users = 0;
- static void sleep_125ms(void)
- {
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(HZ >> 3);
- }
- static void udelay2(void)
- {
- udelay(2);
- }
- static void udelay4(void)
- {
- udelay(4);
- }
- static void udelay16(void)
- {
- udelay(16);
- }
- static __u32 radio_bits_get(struct radio_device *dev)
- {
- register __u16 io=dev->io, l, rdata;
- register __u32 data=0;
- __u16 omask;
- omask = inw(io + IO_MASK);
- outw(~(STR_CLK | STR_WREN), io + IO_MASK);
- outw(0, io);
- udelay16();
- for (l=24;l--;) {
- outw(STR_CLK, io); /* HI state */
- udelay2();
- if(!l)
- dev->tuned = inw(io) & STR_MOST ? 0 : 0xffff;
- outw(0, io); /* LO state */
- udelay2();
- data <<= 1; /* shift data */
- rdata = inw(io);
- if(!l)
- dev->stereo = rdata & STR_MOST ?
- 0 : VIDEO_TUNER_STEREO_ON;
- else
- if(rdata & STR_DATA)
- data++;
- udelay2();
- }
- if(dev->muted)
- outw(STR_WREN, io);
- udelay4();
- outw(omask, io + IO_MASK);
- return data & 0x3ffe;
- }
- static void radio_bits_set(struct radio_device *dev, __u32 data)
- {
- register __u16 io=dev->io, l, bits;
- __u16 omask, odir;
- omask = inw(io + IO_MASK);
- odir = (inw(io + IO_DIR) & ~STR_DATA) | (STR_CLK | STR_WREN);
- outw(odir | STR_DATA, io + IO_DIR);
- outw(~(STR_DATA | STR_CLK | STR_WREN), io + IO_MASK);
- udelay16();
- for (l=25;l;l--) {
- bits = ((data >> 18) & STR_DATA) | STR_WREN ;
- data <<= 1; /* shift data */
- outw(bits, io); /* start strobe */
- udelay2();
- outw(bits | STR_CLK, io); /* HI level */
- udelay2();
- outw(bits, io); /* LO level */
- udelay4();
- }
- if(!dev->muted)
- outw(0, io);
- udelay4();
- outw(omask, io + IO_MASK);
- outw(odir, io + IO_DIR);
- sleep_125ms();
- }
- inline static int radio_function(struct video_device *dev,
- unsigned int cmd, void *arg)
- {
- struct radio_device *card=dev->priv;
- switch(cmd) {
- case VIDIOCGCAP: {
- struct video_capability v;
- strcpy(v.name, "Maestro radio");
- v.type=VID_TYPE_TUNER;
- v.channels=v.audios=1;
- v.maxwidth=v.maxheight=v.minwidth=v.minheight=0;
- if(copy_to_user(arg,&v,sizeof(v)))
- return -EFAULT;
- return 0;
- }
- case VIDIOCGTUNER: {
- struct video_tuner v;
- if(copy_from_user(&v, arg,sizeof(v))!=0)
- return -EFAULT;
- if(v.tuner)
- return -EINVAL;
- (void)radio_bits_get(card);
- v.flags = VIDEO_TUNER_LOW | card->stereo;
- v.signal = card->tuned;
- strcpy(v.name, "FM");
- v.rangelow = FREQ_LO;
- v.rangehigh = FREQ_HI;
- v.mode = VIDEO_MODE_AUTO;
- if(copy_to_user(arg,&v, sizeof(v)))
- return -EFAULT;
- return 0;
- }
- case VIDIOCSTUNER: {
- struct video_tuner v;
- if(copy_from_user(&v, arg, sizeof(v)))
- return -EFAULT;
- if(v.tuner!=0)
- return -EINVAL;
- return 0;
- }
- case VIDIOCGFREQ: {
- unsigned long tmp=BITS2FREQ(radio_bits_get(card));
- if(copy_to_user(arg, &tmp, sizeof(tmp)))
- return -EFAULT;
- return 0;
- }
- case VIDIOCSFREQ: {
- unsigned long tmp;
- if(copy_from_user(&tmp, arg, sizeof(tmp)))
- return -EFAULT;
- if ( tmp<FREQ_LO || tmp>FREQ_HI )
- return -EINVAL;
- radio_bits_set(card, FREQ2BITS(tmp));
- return 0;
- }
- case VIDIOCGAUDIO: {
- struct video_audio v;
- strcpy(v.name, "Radio");
- v.audio=v.volume=v.bass=v.treble=v.balance=v.step=0;
- v.flags=VIDEO_AUDIO_MUTABLE | card->muted;
- v.mode=VIDEO_SOUND_STEREO;
- if(copy_to_user(arg,&v, sizeof(v)))
- return -EFAULT;
- return 0;
- }
- case VIDIOCSAUDIO: {
- struct video_audio v;
- if(copy_from_user(&v, arg, sizeof(v)))
- return -EFAULT;
- if(v.audio)
- return -EINVAL;
- {
- register __u16 io=card->io;
- register __u16 omask = inw(io + IO_MASK);
- outw(~STR_WREN, io + IO_MASK);
- outw((card->muted = v.flags & VIDEO_AUDIO_MUTE)
- ? STR_WREN : 0, io);
- udelay4();
- outw(omask, io + IO_MASK);
- sleep_125ms();
- return 0;
- }
- }
- case VIDIOCGUNIT: {
- struct video_unit v;
- v.video=VIDEO_NO_UNIT;
- v.vbi=VIDEO_NO_UNIT;
- v.radio=dev->minor;
- v.audio=0;
- v.teletext=VIDEO_NO_UNIT;
- if(copy_to_user(arg, &v, sizeof(v)))
- return -EFAULT;
- return 0;
- }
- default: return -ENOIOCTLCMD;
- }
- }
- static int radio_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
- {
- struct radio_device *card=dev->priv;
- int ret;
- down(&card->lock);
- ret = radio_function(dev, cmd, arg);
- up(&card->lock);
- return ret;
- }
- static int radio_open(struct video_device *dev, int flags)
- {
- if(users)
- return -EBUSY;
- users++;
- return 0;
- }
- static void radio_close(struct video_device *dev)
- {
- users--;
- }
- inline static __u16 radio_install(struct pci_dev *pcidev);
- MODULE_AUTHOR("Adam Tlalka, atlka@pg.gda.pl");
- MODULE_DESCRIPTION("Radio driver for the Maestro PCI sound card radio.");
- MODULE_LICENSE("GPL");
- EXPORT_NO_SYMBOLS;
- void __exit maestro_radio_exit(void)
- {
- video_unregister_device(&maestro_radio);
- }
- int __init maestro_radio_init(void)
- {
- register __u16 found=0;
- struct pci_dev *pcidev = NULL;
- if(!pci_present())
- return -ENODEV;
- while(!found && (pcidev = pci_find_device(PCI_VENDOR_ESS,
- PCI_DEVICE_ID_ESS_ESS1968,
- pcidev)))
- found |= radio_install(pcidev);
- while(!found && (pcidev = pci_find_device(PCI_VENDOR_ESS,
- PCI_DEVICE_ID_ESS_ESS1978,
- pcidev)))
- found |= radio_install(pcidev);
- if(!found) {
- printk(KERN_INFO "radio-maestro: no devices found.n");
- return -ENODEV;
- }
- return 0;
- }
- module_init(maestro_radio_init);
- module_exit(maestro_radio_exit);
- inline static __u16 radio_power_on(struct radio_device *dev)
- {
- register __u16 io=dev->io;
- register __u32 ofreq;
- __u16 omask, odir;
- omask = inw(io + IO_MASK);
- odir = (inw(io + IO_DIR) & ~STR_DATA) | (STR_CLK | STR_WREN);
- outw(odir & ~STR_WREN, io + IO_DIR);
- dev->muted = inw(io) & STR_WREN ? 0 : VIDEO_AUDIO_MUTE;
- outw(odir, io + IO_DIR);
- outw(~(STR_WREN | STR_CLK), io + IO_MASK);
- outw(dev->muted ? 0 : STR_WREN, io);
- udelay16();
- outw(omask, io + IO_MASK);
- ofreq = radio_bits_get(dev);
- if((ofreq<FREQ2BITS(FREQ_LO)) || (ofreq>FREQ2BITS(FREQ_HI)))
- ofreq = FREQ2BITS(FREQ_LO);
- radio_bits_set(dev, ofreq);
- return (ofreq == radio_bits_get(dev));
- }
- inline static __u16 radio_install(struct pci_dev *pcidev)
- {
- if(((pcidev->class >> 8) & 0xffff) != PCI_CLASS_MULTIMEDIA_AUDIO)
- return 0;
-
- radio_unit.io = pcidev->resource[0].start + GPIO_DATA;
- maestro_radio.priv = &radio_unit;
- init_MUTEX(&radio_unit.lock);
-
- if(radio_power_on(&radio_unit)) {
- if(video_register_device(&maestro_radio, VFL_TYPE_RADIO, radio_nr)==-1) {
- printk("radio-maestro: can't register device!");
- return 0;
- }
- printk(KERN_INFO "radio-maestro: version "
- DRIVER_VERSION
- " time "
- __TIME__ " "
- __DATE__
- "n");
- printk(KERN_INFO "radio-maestro: radio chip initializedn");
- return 1;
- } else
- return 0;
- }