drivers/media/radio/radio-sf16fmr2.c

   1 /* SF16-FMR2 and SF16-FMD2 radio driver for Linux
   2  * Copyright (c) 2011 Ondrej Zary
   3  *
   4  * Original driver was (c) 2000-2002 Ziglio Frediano, freddy77@angelfire.com
   5  * but almost nothing remained here after conversion to generic TEA575x
   6  * implementation
   7  */
   8
   9 #include <linux/delay.h>
  10 #include <linux/module.h>       /* Modules                      */
  11 #include <linux/init.h>         /* Initdata                     */
  12 #include <linux/slab.h>
  13 #include <linux/ioport.h>       /* request_region               */
  14 #include <linux/io.h>           /* outb, outb_p                 */
  15 #include <linux/isa.h>
  16 #include <linux/pnp.h>
  17 #include <media/drv-intf/tea575x.h>
  18
  19 MODULE_AUTHOR("Ondrej Zary");
  20 MODULE_DESCRIPTION("MediaForte SF16-FMR2 and SF16-FMD2 FM radio card driver");
  21 MODULE_LICENSE("GPL");
  22
  23 /* these cards can only use two different ports (0x384 and 0x284) */
  24 #define FMR2_MAX 2
  25
  26 static int radio_nr[FMR2_MAX] = { [0 ... (FMR2_MAX - 1)] = -1 };
  27 module_param_array(radio_nr, int, NULL, 0444);
  28 MODULE_PARM_DESC(radio_nr, "Radio device numbers");
  29
  30 struct fmr2 {
  31         int io;
  32         struct v4l2_device v4l2_dev;
  33         struct snd_tea575x tea;
  34         struct v4l2_ctrl *volume;
  35         struct v4l2_ctrl *balance;
  36         bool is_fmd2;
  37 };
  38
  39 static int num_fmr2_cards;
  40 static struct fmr2 *fmr2_cards[FMR2_MAX];
  41 static bool isa_registered;
  42 static bool pnp_registered;
  43
  44 /* the port is hardwired on SF16-FMR2 */
  45 #define FMR2_PORT       0x384
  46
  47 /* TEA575x tuner pins */
  48 #define STR_DATA        (1 << 0)
  49 #define STR_CLK         (1 << 1)
  50 #define STR_WREN        (1 << 2)
  51 #define STR_MOST        (1 << 3)
  52 /* PT2254A/TC9154A volume control pins */
  53 #define PT_ST           (1 << 4)
  54 #define PT_CK           (1 << 5)
  55 #define PT_DATA         (1 << 6)
  56 /* volume control presence pin */
  57 #define FMR2_HASVOL     (1 << 7)
  58
  59 static void fmr2_tea575x_set_pins(struct snd_tea575x *tea, u8 pins)
  60 {
  61         struct fmr2 *fmr2 = tea->private_data;
  62         u8 bits = 0;
  63
  64         bits |= (pins & TEA575X_DATA) ? STR_DATA : 0;
  65         bits |= (pins & TEA575X_CLK)  ? STR_CLK  : 0;
  66         /* WRITE_ENABLE is inverted, DATA must be high during read */
  67         bits |= (pins & TEA575X_WREN) ? 0 : STR_WREN | STR_DATA;
  68
  69         outb(bits, fmr2->io);
  70 }
  71
  72 static u8 fmr2_tea575x_get_pins(struct snd_tea575x *tea)
  73 {
  74         struct fmr2 *fmr2 = tea->private_data;
  75         u8 bits = inb(fmr2->io);
  76
  77         return  ((bits & STR_DATA) ? TEA575X_DATA : 0) |
  78                 ((bits & STR_MOST) ? TEA575X_MOST : 0);
  79 }
  80
  81 static void fmr2_tea575x_set_direction(struct snd_tea575x *tea, bool output)
  82 {
  83 }
  84
  85 static const struct snd_tea575x_ops fmr2_tea_ops = {
  86         .set_pins = fmr2_tea575x_set_pins,
  87         .get_pins = fmr2_tea575x_get_pins,
  88         .set_direction = fmr2_tea575x_set_direction,
  89 };
  90
  91 /* TC9154A/PT2254A volume control */
  92
  93 /* 18-bit shift register bit definitions */
  94 #define TC9154A_ATT_MAJ_0DB     (1 << 0)
  95 #define TC9154A_ATT_MAJ_10DB    (1 << 1)
  96 #define TC9154A_ATT_MAJ_20DB    (1 << 2)
  97 #define TC9154A_ATT_MAJ_30DB    (1 << 3)
  98 #define TC9154A_ATT_MAJ_40DB    (1 << 4)
  99 #define TC9154A_ATT_MAJ_50DB    (1 << 5)
 100 #define TC9154A_ATT_MAJ_60DB    (1 << 6)
 101
 102 #define TC9154A_ATT_MIN_0DB     (1 << 7)
 103 #define TC9154A_ATT_MIN_2DB     (1 << 8)
 104 #define TC9154A_ATT_MIN_4DB     (1 << 9)
 105 #define TC9154A_ATT_MIN_6DB     (1 << 10)
 106 #define TC9154A_ATT_MIN_8DB     (1 << 11)
 107 /* bit 12 is ignored */
 108 #define TC9154A_CHANNEL_LEFT    (1 << 13)
 109 #define TC9154A_CHANNEL_RIGHT   (1 << 14)
 110 /* bits 15, 16, 17 must be 0 */
 111
 112 #define TC9154A_ATT_MAJ(x)      (1 << x)
 113 #define TC9154A_ATT_MIN(x)      (1 << (7 + x))
 114
 115 static void tc9154a_set_pins(struct fmr2 *fmr2, u8 pins)
 116 {
 117         if (!fmr2->tea.mute)
 118                 pins |= STR_WREN;
 119
 120         outb(pins, fmr2->io);
 121 }
 122
 123 static void tc9154a_set_attenuation(struct fmr2 *fmr2, int att, u32 channel)
 124 {
 125         int i;
 126         u32 reg;
 127         u8 bit;
 128
 129         reg = TC9154A_ATT_MAJ(att / 10) | TC9154A_ATT_MIN((att % 10) / 2);
 130         reg |= channel;
 131         /* write 18-bit shift register, LSB first */
 132         for (i = 0; i < 18; i++) {
 133                 bit = reg & (1 << i) ? PT_DATA : 0;
 134                 tc9154a_set_pins(fmr2, bit);
 135                 udelay(5);
 136                 tc9154a_set_pins(fmr2, bit | PT_CK);
 137                 udelay(5);
 138                 tc9154a_set_pins(fmr2, bit);
 139         }
 140
 141         /* latch register data */
 142         udelay(5);
 143         tc9154a_set_pins(fmr2, PT_ST);
 144         udelay(5);
 145         tc9154a_set_pins(fmr2, 0);
 146 }
 147
 148 static int fmr2_s_ctrl(struct v4l2_ctrl *ctrl)
 149 {
 150         struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler);
 151         struct fmr2 *fmr2 = tea->private_data;
 152         int volume, balance, left, right;
 153
 154         switch (ctrl->id) {
 155         case V4L2_CID_AUDIO_VOLUME:
 156                 volume = ctrl->val;
 157                 balance = fmr2->balance->cur.val;
 158                 break;
 159         case V4L2_CID_AUDIO_BALANCE:
 160                 balance = ctrl->val;
 161                 volume = fmr2->volume->cur.val;
 162                 break;
 163         default:
 164                 return -EINVAL;
 165         }
 166
 167         left = right = volume;
 168         if (balance < 0)
 169                 right = max(0, right + balance);
 170         if (balance > 0)
 171                 left = max(0, left - balance);
 172
 173         tc9154a_set_attenuation(fmr2, abs(left - 68), TC9154A_CHANNEL_LEFT);
 174         tc9154a_set_attenuation(fmr2, abs(right - 68), TC9154A_CHANNEL_RIGHT);
 175
 176         return 0;
 177 }
 178
 179 static const struct v4l2_ctrl_ops fmr2_ctrl_ops = {
 180         .s_ctrl = fmr2_s_ctrl,
 181 };
 182
 183 static int fmr2_tea_ext_init(struct snd_tea575x *tea)
 184 {
 185         struct fmr2 *fmr2 = tea->private_data;
 186
 187         /* FMR2 can have volume control, FMD2 can't (uses SB16 mixer) */
 188         if (!fmr2->is_fmd2 && inb(fmr2->io) & FMR2_HASVOL) {
 189                 fmr2->volume = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_VOLUME, 0, 68, 2, 56);
 190                 fmr2->balance = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_BALANCE, -68, 68, 2, 0);
 191                 if (tea->ctrl_handler.error) {
 192                         printk(KERN_ERR "radio-sf16fmr2: can't initialize controls\n");
 193                         return tea->ctrl_handler.error;
 194                 }
 195         }
 196
 197         return 0;
 198 }
 199
 200 static struct pnp_device_id fmr2_pnp_ids[] = {
 201         { .id = "MFRad13" }, /* tuner subdevice of SF16-FMD2 */
 202         { .id = "" }
 203 };
 204 MODULE_DEVICE_TABLE(pnp, fmr2_pnp_ids);
 205
 206 static int fmr2_probe(struct fmr2 *fmr2, struct device *pdev, int io)
 207 {
 208         int err, i;
 209         char *card_name = fmr2->is_fmd2 ? "SF16-FMD2" : "SF16-FMR2";
 210
 211         /* avoid errors if a card was already registered at given port */
 212         for (i = 0; i < num_fmr2_cards; i++)
 213                 if (io == fmr2_cards[i]->io)
 214                         return -EBUSY;
 215
 216         strlcpy(fmr2->v4l2_dev.name, "radio-sf16fmr2",
 217                         sizeof(fmr2->v4l2_dev.name)),
 218         fmr2->io = io;
 219
 220         if (!request_region(fmr2->io, 2, fmr2->v4l2_dev.name)) {
 221                 printk(KERN_ERR "radio-sf16fmr2: I/O port 0x%x already in use\n", fmr2->io);
 222                 return -EBUSY;
 223         }
 224
 225         dev_set_drvdata(pdev, fmr2);
 226         err = v4l2_device_register(pdev, &fmr2->v4l2_dev);
 227         if (err < 0) {
 228                 v4l2_err(&fmr2->v4l2_dev, "Could not register v4l2_device\n");
 229                 release_region(fmr2->io, 2);
 230                 return err;
 231         }
 232         fmr2->tea.v4l2_dev = &fmr2->v4l2_dev;
 233         fmr2->tea.private_data = fmr2;
 234         fmr2->tea.radio_nr = radio_nr[num_fmr2_cards];
 235         fmr2->tea.ops = &fmr2_tea_ops;
 236         fmr2->tea.ext_init = fmr2_tea_ext_init;
 237         strlcpy(fmr2->tea.card, card_name, sizeof(fmr2->tea.card));
 238         snprintf(fmr2->tea.bus_info, sizeof(fmr2->tea.bus_info), "%s:%s",
 239                         fmr2->is_fmd2 ? "PnP" : "ISA", dev_name(pdev));
 240
 241         if (snd_tea575x_init(&fmr2->tea, THIS_MODULE)) {
 242                 printk(KERN_ERR "radio-sf16fmr2: Unable to detect TEA575x tuner\n");
 243                 release_region(fmr2->io, 2);
 244                 return -ENODEV;
 245         }
 246
 247         printk(KERN_INFO "radio-sf16fmr2: %s radio card at 0x%x.\n",
 248                         card_name, fmr2->io);
 249         return 0;
 250 }
 251
 252 static int fmr2_isa_match(struct device *pdev, unsigned int ndev)
 253 {
 254         struct fmr2 *fmr2 = kzalloc(sizeof(*fmr2), GFP_KERNEL);
 255         if (!fmr2)
 256                 return 0;
 257
 258         if (fmr2_probe(fmr2, pdev, FMR2_PORT)) {
 259                 kfree(fmr2);
 260                 return 0;
 261         }
 262         dev_set_drvdata(pdev, fmr2);
 263         fmr2_cards[num_fmr2_cards++] = fmr2;
 264
 265         return 1;
 266 }
 267
 268 static int fmr2_pnp_probe(struct pnp_dev *pdev, const struct pnp_device_id *id)
 269 {
 270         int ret;
 271         struct fmr2 *fmr2 = kzalloc(sizeof(*fmr2), GFP_KERNEL);
 272         if (!fmr2)
 273                 return -ENOMEM;
 274
 275         fmr2->is_fmd2 = true;
 276         ret = fmr2_probe(fmr2, &pdev->dev, pnp_port_start(pdev, 0));
 277         if (ret) {
 278                 kfree(fmr2);
 279                 return ret;
 280         }
 281         pnp_set_drvdata(pdev, fmr2);
 282         fmr2_cards[num_fmr2_cards++] = fmr2;
 283
 284         return 0;
 285 }
 286
 287 static void fmr2_remove(struct fmr2 *fmr2)
 288 {
 289         snd_tea575x_exit(&fmr2->tea);
 290         release_region(fmr2->io, 2);
 291         v4l2_device_unregister(&fmr2->v4l2_dev);
 292         kfree(fmr2);
 293 }
 294
 295 static int fmr2_isa_remove(struct device *pdev, unsigned int ndev)
 296 {
 297         fmr2_remove(dev_get_drvdata(pdev));
 298
 299         return 0;
 300 }
 301
 302 static void fmr2_pnp_remove(struct pnp_dev *pdev)
 303 {
 304         fmr2_remove(pnp_get_drvdata(pdev));
 305         pnp_set_drvdata(pdev, NULL);
 306 }
 307
 308 static struct isa_driver fmr2_isa_driver = {
 309         .match          = fmr2_isa_match,
 310         .remove         = fmr2_isa_remove,
 311         .driver         = {
 312                 .name   = "radio-sf16fmr2",
 313         },
 314 };
 315
 316 static struct pnp_driver fmr2_pnp_driver = {
 317         .name           = "radio-sf16fmr2",
 318         .id_table       = fmr2_pnp_ids,
 319         .probe          = fmr2_pnp_probe,
 320         .remove         = fmr2_pnp_remove,
 321 };
 322
 323 static int __init fmr2_init(void)
 324 {
 325         int ret;
 326
 327         ret = pnp_register_driver(&fmr2_pnp_driver);
 328         if (!ret)
 329                 pnp_registered = true;
 330         ret = isa_register_driver(&fmr2_isa_driver, 1);
 331         if (!ret)
 332                 isa_registered = true;
 333
 334         return (pnp_registered || isa_registered) ? 0 : ret;
 335 }
 336
 337 static void __exit fmr2_exit(void)
 338 {
 339         if (pnp_registered)
 340                 pnp_unregister_driver(&fmr2_pnp_driver);
 341         if (isa_registered)
 342                 isa_unregister_driver(&fmr2_isa_driver);
 343 }
 344
 345 module_init(fmr2_init);
 346 module_exit(fmr2_exit);