drivers/media/radio/radio-maestro.c

   1 /* Maestro PCI sound card radio driver for Linux support
   2  * (c) 2000 A. Tlalka, atlka@pg.gda.pl
   3  * Notes on the hardware
   4  *
   5  *  + Frequency control is done digitally
   6  *  + No volume control - only mute/unmute - you have to use Aux line volume
   7  *  control on Maestro card to set the volume
   8  *  + Radio status (tuned/not_tuned and stereo/mono) is valid some time after
   9  *  frequency setting (>100ms) and only when the radio is unmuted.
  10  *  version 0.02
  11  *  + io port is automatically detected - only the first radio is used
  12  *  version 0.03
  13  *  + thread access locking additions
  14  *  version 0.04
  15  * + code improvements
  16  * + VIDEO_TUNER_LOW is permanent
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/ioport.h>
  22 #include <linux/delay.h>
  23 #include <linux/sched.h>
  24 #include <asm/io.h>
  25 #include <asm/uaccess.h>
  26 #include <linux/mutex.h>
  27 #include <linux/pci.h>
  28 #include <linux/videodev.h>
  29 #include <media/v4l2-common.h>
  30
  31 #define DRIVER_VERSION  "0.05"
  32
  33 #define GPIO_DATA       0x60   /* port offset from ESS_IO_BASE */
  34
  35 #define IO_MASK         4      /* mask      register offset from GPIO_DATA
  36                                 bits 1=unmask write to given bit */
  37 #define IO_DIR          8      /* direction register offset from GPIO_DATA
  38                                 bits 0/1=read/write direction */
  39
  40 #define GPIO6           0x0040 /* mask bits for GPIO lines */
  41 #define GPIO7           0x0080
  42 #define GPIO8           0x0100
  43 #define GPIO9           0x0200
  44
  45 #define STR_DATA        GPIO6  /* radio TEA5757 pins and GPIO bits */
  46 #define STR_CLK         GPIO7
  47 #define STR_WREN        GPIO8
  48 #define STR_MOST        GPIO9
  49
  50 #define FREQ_LO          50*16000
  51 #define FREQ_HI         150*16000
  52
  53 #define FREQ_IF         171200 /* 10.7*16000   */
  54 #define FREQ_STEP       200    /* 12.5*16      */
  55
  56 #define FREQ2BITS(x)    ((((unsigned int)(x)+FREQ_IF+(FREQ_STEP<<1))\
  57                         /(FREQ_STEP<<2))<<2) /* (x==fmhz*16*1000) -> bits */
  58
  59 #define BITS2FREQ(x)    ((x) * FREQ_STEP - FREQ_IF)
  60
  61 static int radio_nr = -1;
  62 module_param(radio_nr, int, 0);
  63
  64 static int radio_ioctl(struct inode *inode, struct file *file,
  65         unsigned int cmd, unsigned long arg);
  66 static int maestro_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  67 static void maestro_remove(struct pci_dev *pdev);
  68
  69 static struct pci_device_id maestro_r_pci_tbl[] = {
  70         { PCI_DEVICE(PCI_VENDOR_ID_ESS, PCI_DEVICE_ID_ESS_ESS1968),
  71                 .class = PCI_CLASS_MULTIMEDIA_AUDIO << 8,
  72                 .class_mask = 0xffff00 },
  73         { PCI_DEVICE(PCI_VENDOR_ID_ESS, PCI_DEVICE_ID_ESS_ESS1978),
  74                 .class = PCI_CLASS_MULTIMEDIA_AUDIO << 8,
  75                 .class_mask = 0xffff00 },
  76         { 0 }
  77 };
  78 MODULE_DEVICE_TABLE(pci, maestro_r_pci_tbl);
  79
  80 static struct pci_driver maestro_r_driver = {
  81         .name           = "maestro_radio",
  82         .id_table       = maestro_r_pci_tbl,
  83         .probe          = maestro_probe,
  84         .remove         = __devexit_p(maestro_remove),
  85 };
  86
  87 static struct file_operations maestro_fops = {
  88         .owner          = THIS_MODULE,
  89         .open           = video_exclusive_open,
  90         .release        = video_exclusive_release,
  91         .ioctl          = radio_ioctl,
  92         .compat_ioctl   = v4l_compat_ioctl32,
  93         .llseek         = no_llseek,
  94 };
  95
  96 static struct video_device maestro_radio = {
  97         .name           = "Maestro radio",
  98         .type           = VID_TYPE_TUNER,
  99         .hardware       = VID_HARDWARE_SF16MI,
 100         .fops           = &maestro_fops,
 101 };
 102
 103 struct radio_device {
 104         u16     io,     /* base of Maestro card radio io (GPIO_DATA)*/
 105                 muted,  /* VIDEO_AUDIO_MUTE */
 106                 stereo, /* VIDEO_TUNER_STEREO_ON */
 107                 tuned;  /* signal strength (0 or 0xffff) */
 108         struct mutex lock;
 109 };
 110
 111 static u32 radio_bits_get(struct radio_device *dev)
 112 {
 113         register u16 io=dev->io, l, rdata;
 114         register u32 data=0;
 115         u16 omask;
 116
 117         omask = inw(io + IO_MASK);
 118         outw(~(STR_CLK | STR_WREN), io + IO_MASK);
 119         outw(0, io);
 120         udelay(16);
 121
 122         for (l=24;l--;) {
 123                 outw(STR_CLK, io);              /* HI state */
 124                 udelay(2);
 125                 if(!l)
 126                         dev->tuned = inw(io) & STR_MOST ? 0 : 0xffff;
 127                 outw(0, io);                    /* LO state */
 128                 udelay(2);
 129                 data <<= 1;                     /* shift data */
 130                 rdata = inw(io);
 131                 if(!l)
 132                         dev->stereo =  rdata & STR_MOST ?
 133                         0 : VIDEO_TUNER_STEREO_ON;
 134                 else
 135                         if(rdata & STR_DATA)
 136                                 data++;
 137                 udelay(2);
 138         }
 139
 140         if(dev->muted)
 141                 outw(STR_WREN, io);
 142
 143         udelay(4);
 144         outw(omask, io + IO_MASK);
 145
 146         return data & 0x3ffe;
 147 }
 148
 149 static void radio_bits_set(struct radio_device *dev, u32 data)
 150 {
 151         register u16 io=dev->io, l, bits;
 152         u16 omask, odir;
 153
 154         omask = inw(io + IO_MASK);
 155         odir  = (inw(io + IO_DIR) & ~STR_DATA) | (STR_CLK | STR_WREN);
 156         outw(odir | STR_DATA, io + IO_DIR);
 157         outw(~(STR_DATA | STR_CLK | STR_WREN), io + IO_MASK);
 158         udelay(16);
 159         for (l=25;l;l--) {
 160                 bits = ((data >> 18) & STR_DATA) | STR_WREN ;
 161                 data <<= 1;                     /* shift data */
 162                 outw(bits, io);                 /* start strobe */
 163                 udelay(2);
 164                 outw(bits | STR_CLK, io);       /* HI level */
 165                 udelay(2);
 166                 outw(bits, io);                 /* LO level */
 167                 udelay(4);
 168         }
 169
 170         if(!dev->muted)
 171                 outw(0, io);
 172
 173         udelay(4);
 174         outw(omask, io + IO_MASK);
 175         outw(odir, io + IO_DIR);
 176         msleep(125);
 177 }
 178
 179 static inline int radio_function(struct inode *inode, struct file *file,
 180         unsigned int cmd, void *arg)
 181 {
 182         struct video_device *dev = video_devdata(file);
 183         struct radio_device *card = video_get_drvdata(dev);
 184
 185         switch (cmd) {
 186         case VIDIOCGCAP: {
 187                 struct video_capability *v = arg;
 188                 memset(v, 0, sizeof(*v));
 189                 strcpy(v->name, "Maestro radio");
 190                 v->type = VID_TYPE_TUNER;
 191                 v->channels = v->audios = 1;
 192                 return 0;
 193         } case VIDIOCGTUNER: {
 194                 struct video_tuner *v = arg;
 195                 if (v->tuner)
 196                         return -EINVAL;
 197                 (void)radio_bits_get(card);
 198                 v->flags = VIDEO_TUNER_LOW | card->stereo;
 199                 v->signal = card->tuned;
 200                 strcpy(v->name, "FM");
 201                 v->rangelow = FREQ_LO;
 202                 v->rangehigh = FREQ_HI;
 203                 v->mode = VIDEO_MODE_AUTO;
 204                 return 0;
 205         } case VIDIOCSTUNER: {
 206                 struct video_tuner *v = arg;
 207                 if (v->tuner != 0)
 208                         return -EINVAL;
 209                 return 0;
 210         } case VIDIOCGFREQ: {
 211                 unsigned long *freq = arg;
 212                 *freq = BITS2FREQ(radio_bits_get(card));
 213                 return 0;
 214         } case VIDIOCSFREQ: {
 215                 unsigned long *freq = arg;
 216                 if (*freq < FREQ_LO || *freq > FREQ_HI)
 217                         return -EINVAL;
 218                 radio_bits_set(card, FREQ2BITS(*freq));
 219                 return 0;
 220         } case VIDIOCGAUDIO: {
 221                 struct video_audio *v = arg;
 222                 memset(v, 0, sizeof(*v));
 223                 strcpy(v->name, "Radio");
 224                 v->flags = VIDEO_AUDIO_MUTABLE | card->muted;
 225                 v->mode = VIDEO_SOUND_STEREO;
 226                 return 0;
 227         } case VIDIOCSAUDIO: {
 228                 struct video_audio *v = arg;
 229                 if (v->audio)
 230                         return -EINVAL;
 231                 {
 232                         register u16 io = card->io;
 233                         register u16 omask = inw(io + IO_MASK);
 234                         outw(~STR_WREN, io + IO_MASK);
 235                         outw((card->muted = v->flags & VIDEO_AUDIO_MUTE) ?
 236                                 STR_WREN : 0, io);
 237                         udelay(4);
 238                         outw(omask, io + IO_MASK);
 239                         msleep(125);
 240                         return 0;
 241                 }
 242         } case VIDIOCGUNIT: {
 243                 struct video_unit *v = arg;
 244                 v->video = VIDEO_NO_UNIT;
 245                 v->vbi = VIDEO_NO_UNIT;
 246                 v->radio = dev->minor;
 247                 v->audio = 0;
 248                 v->teletext = VIDEO_NO_UNIT;
 249                 return 0;
 250         } default:
 251                 return -ENOIOCTLCMD;
 252         }
 253 }
 254
 255 static int radio_ioctl(struct inode *inode, struct file *file,
 256         unsigned int cmd, unsigned long arg)
 257 {
 258         struct video_device *dev = video_devdata(file);
 259         struct radio_device *card = video_get_drvdata(dev);
 260         int ret;
 261
 262         mutex_lock(&card->lock);
 263         ret = video_usercopy(inode, file, cmd, arg, radio_function);
 264         mutex_unlock(&card->lock);
 265
 266         return ret;
 267 }
 268
 269 static u16 __devinit radio_power_on(struct radio_device *dev)
 270 {
 271         register u16 io = dev->io;
 272         register u32 ofreq;
 273         u16 omask, odir;
 274
 275         omask = inw(io + IO_MASK);
 276         odir = (inw(io + IO_DIR) & ~STR_DATA) | (STR_CLK | STR_WREN);
 277         outw(odir & ~STR_WREN, io + IO_DIR);
 278         dev->muted = inw(io) & STR_WREN ? 0 : VIDEO_AUDIO_MUTE;
 279         outw(odir, io + IO_DIR);
 280         outw(~(STR_WREN | STR_CLK), io + IO_MASK);
 281         outw(dev->muted ? 0 : STR_WREN, io);
 282         udelay(16);
 283         outw(omask, io + IO_MASK);
 284         ofreq = radio_bits_get(dev);
 285
 286         if ((ofreq < FREQ2BITS(FREQ_LO)) || (ofreq > FREQ2BITS(FREQ_HI)))
 287                 ofreq = FREQ2BITS(FREQ_LO);
 288         radio_bits_set(dev, ofreq);
 289
 290         return (ofreq == radio_bits_get(dev));
 291 }
 292
 293 static int __devinit maestro_probe(struct pci_dev *pdev,
 294         const struct pci_device_id *ent)
 295 {
 296         struct radio_device *radio_unit;
 297         struct video_device *maestro_radio_inst;
 298         int retval;
 299
 300         retval = pci_enable_device(pdev);
 301         if (retval) {
 302                 dev_err(&pdev->dev, "enabling pci device failed!\n");
 303                 goto err;
 304         }
 305
 306         retval = -ENOMEM;
 307
 308         radio_unit = kzalloc(sizeof(*radio_unit), GFP_KERNEL);
 309         if (radio_unit == NULL) {
 310                 dev_err(&pdev->dev, "not enough memory\n");
 311                 goto err;
 312         }
 313
 314         radio_unit->io = pci_resource_start(pdev, 0) + GPIO_DATA;
 315         mutex_init(&radio_unit->lock);
 316
 317         maestro_radio_inst = video_device_alloc();
 318         if (maestro_radio_inst == NULL) {
 319                 dev_err(&pdev->dev, "not enough memory\n");
 320                 goto errfr;
 321         }
 322
 323         memcpy(maestro_radio_inst, &maestro_radio, sizeof(maestro_radio));
 324         video_set_drvdata(maestro_radio_inst, radio_unit);
 325         pci_set_drvdata(pdev, maestro_radio_inst);
 326
 327         retval = video_register_device(maestro_radio_inst, VFL_TYPE_RADIO,
 328                 radio_nr);
 329         if (retval) {
 330                 printk(KERN_ERR "can't register video device!\n");
 331                 goto errfr1;
 332         }
 333
 334         if (!radio_power_on(radio_unit)) {
 335                 retval = -EIO;
 336                 goto errunr;
 337         }
 338
 339         dev_info(&pdev->dev, "version " DRIVER_VERSION " time " __TIME__ "  "
 340                  __DATE__ "\n");
 341         dev_info(&pdev->dev, "radio chip initialized\n");
 342
 343         return 0;
 344 errunr:
 345         video_unregister_device(maestro_radio_inst);
 346 errfr1:
 347         kfree(maestro_radio_inst);
 348 errfr:
 349         kfree(radio_unit);
 350 err:
 351         return retval;
 352
 353 }
 354
 355 static void __devexit maestro_remove(struct pci_dev *pdev)
 356 {
 357         struct video_device *vdev = pci_get_drvdata(pdev);
 358
 359         video_unregister_device(vdev);
 360 }
 361
 362 static int __init maestro_radio_init(void)
 363 {
 364         int retval = pci_register_driver(&maestro_r_driver);
 365
 366         if (retval)
 367                 printk(KERN_ERR "error during registration pci driver\n");
 368
 369         return retval;
 370 }
 371
 372 static void __exit maestro_radio_exit(void)
 373 {
 374         pci_unregister_driver(&maestro_r_driver);
 375 }
 376
 377 module_init(maestro_radio_init);
 378 module_exit(maestro_radio_exit);
 379
 380 MODULE_AUTHOR("Adam Tlalka, atlka@pg.gda.pl");
 381 MODULE_DESCRIPTION("Radio driver for the Maestro PCI sound card radio.");
 382 MODULE_LICENSE("GPL");