drivers/media/radio/radio-sf16fmr2.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* SF16-FMR2 and SF16-FMD2 radio driver for Linux
   3  * Copyright (c) 2011 Ondrej Zary
   4  *
   5  * Original driver was (c) 2000-2002 Ziglio Frediano, freddy77@angelfire.com
   6  * but almost nothing remained here after conversion to generic TEA575x
   7  * implementation
   8  */
   9
  10 #include <linux/delay.h>
  11 #include <linux/module.h>       /* Modules                      */
  12 #include <linux/init.h>         /* Initdata                     */
  13 #include <linux/slab.h>
  14 #include <linux/ioport.h>       /* request_region               */
  15 #include <linux/io.h>           /* outb, outb_p                 */
  16 #include <linux/isa.h>
  17 #include <linux/pnp.h>
  18 #include <media/drv-intf/tea575x.h>
  19
  20 MODULE_AUTHOR("Ondrej Zary");
  21 MODULE_DESCRIPTION("MediaForte SF16-FMR2 and SF16-FMD2 FM radio card driver");
  22 MODULE_LICENSE("GPL");
  23
  24 /* these cards can only use two different ports (0x384 and 0x284) */
  25 #define FMR2_MAX 2
  26
  27 static int radio_nr[FMR2_MAX] = { [0 ... (FMR2_MAX - 1)] = -1 };
  28 module_param_array(radio_nr, int, NULL, 0444);
  29 MODULE_PARM_DESC(radio_nr, "Radio device numbers");
  30
  31 struct fmr2 {
  32         int io;
  33         struct v4l2_device v4l2_dev;
  34         struct snd_tea575x tea;
  35         struct v4l2_ctrl *volume;
  36         struct v4l2_ctrl *balance;
  37         bool is_fmd2;
  38 };
  39
  40 static int num_fmr2_cards;
  41 static struct fmr2 *fmr2_cards[FMR2_MAX];
  42 static bool isa_registered;
  43 static bool pnp_registered;
  44
  45 /* the port is hardwired on SF16-FMR2 */
  46 #define FMR2_PORT       0x384
  47
  48 /* TEA575x tuner pins */
  49 #define STR_DATA        (1 << 0)
  50 #define STR_CLK         (1 << 1)
  51 #define STR_WREN        (1 << 2)
  52 #define STR_MOST        (1 << 3)
  53 /* PT2254A/TC9154A volume control pins */
  54 #define PT_ST           (1 << 4)
  55 #define PT_CK           (1 << 5)
  56 #define PT_DATA         (1 << 6)
  57 /* volume control presence pin */
  58 #define FMR2_HASVOL     (1 << 7)
  59
  60 static void fmr2_tea575x_set_pins(struct snd_tea575x *tea, u8 pins)
  61 {
  62         struct fmr2 *fmr2 = tea->private_data;
  63         u8 bits = 0;
  64
  65         bits |= (pins & TEA575X_DATA) ? STR_DATA : 0;
  66         bits |= (pins & TEA575X_CLK)  ? STR_CLK  : 0;
  67         /* WRITE_ENABLE is inverted, DATA must be high during read */
  68         bits |= (pins & TEA575X_WREN) ? 0 : STR_WREN | STR_DATA;
  69
  70         outb(bits, fmr2->io);
  71 }
  72
  73 static u8 fmr2_tea575x_get_pins(struct snd_tea575x *tea)
  74 {
  75         struct fmr2 *fmr2 = tea->private_data;
  76         u8 bits = inb(fmr2->io);
  77
  78         return  ((bits & STR_DATA) ? TEA575X_DATA : 0) |
  79                 ((bits & STR_MOST) ? TEA575X_MOST : 0);
  80 }
  81
  82 static void fmr2_tea575x_set_direction(struct snd_tea575x *tea, bool output)
  83 {
  84 }
  85
  86 static const struct snd_tea575x_ops fmr2_tea_ops = {
  87         .set_pins = fmr2_tea575x_set_pins,
  88         .get_pins = fmr2_tea575x_get_pins,
  89         .set_direction = fmr2_tea575x_set_direction,
  90 };
  91
  92 /* TC9154A/PT2254A volume control */
  93
  94 /* 18-bit shift register bit definitions */
  95 #define TC9154A_ATT_MAJ_0DB     (1 << 0)
  96 #define TC9154A_ATT_MAJ_10DB    (1 << 1)
  97 #define TC9154A_ATT_MAJ_20DB    (1 << 2)
  98 #define TC9154A_ATT_MAJ_30DB    (1 << 3)
  99 #define TC9154A_ATT_MAJ_40DB    (1 << 4)
 100 #define TC9154A_ATT_MAJ_50DB    (1 << 5)
 101 #define TC9154A_ATT_MAJ_60DB    (1 << 6)
 102
 103 #define TC9154A_ATT_MIN_0DB     (1 << 7)
 104 #define TC9154A_ATT_MIN_2DB     (1 << 8)
 105 #define TC9154A_ATT_MIN_4DB     (1 << 9)
 106 #define TC9154A_ATT_MIN_6DB     (1 << 10)
 107 #define TC9154A_ATT_MIN_8DB     (1 << 11)
 108 /* bit 12 is ignored */
 109 #define TC9154A_CHANNEL_LEFT    (1 << 13)
 110 #define TC9154A_CHANNEL_RIGHT   (1 << 14)
 111 /* bits 15, 16, 17 must be 0 */
 112
 113 #define TC9154A_ATT_MAJ(x)      (1 << x)
 114 #define TC9154A_ATT_MIN(x)      (1 << (7 + x))
 115
 116 static void tc9154a_set_pins(struct fmr2 *fmr2, u8 pins)
 117 {
 118         if (!fmr2->tea.mute)
 119                 pins |= STR_WREN;
 120
 121         outb(pins, fmr2->io);
 122 }
 123
 124 static void tc9154a_set_attenuation(struct fmr2 *fmr2, int att, u32 channel)
 125 {
 126         int i;
 127         u32 reg;
 128         u8 bit;
 129
 130         reg = TC9154A_ATT_MAJ(att / 10) | TC9154A_ATT_MIN((att % 10) / 2);
 131         reg |= channel;
 132         /* write 18-bit shift register, LSB first */
 133         for (i = 0; i < 18; i++) {
 134                 bit = reg & (1 << i) ? PT_DATA : 0;
 135                 tc9154a_set_pins(fmr2, bit);
 136                 udelay(5);
 137                 tc9154a_set_pins(fmr2, bit | PT_CK);
 138                 udelay(5);
 139                 tc9154a_set_pins(fmr2, bit);
 140         }
 141
 142         /* latch register data */
 143         udelay(5);
 144         tc9154a_set_pins(fmr2, PT_ST);
 145         udelay(5);
 146         tc9154a_set_pins(fmr2, 0);
 147 }
 148
 149 static int fmr2_s_ctrl(struct v4l2_ctrl *ctrl)
 150 {
 151         struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler);
 152         struct fmr2 *fmr2 = tea->private_data;
 153         int volume, balance, left, right;
 154
 155         switch (ctrl->id) {
 156         case V4L2_CID_AUDIO_VOLUME:
 157                 volume = ctrl->val;
 158                 balance = fmr2->balance->cur.val;
 159                 break;
 160         case V4L2_CID_AUDIO_BALANCE:
 161                 balance = ctrl->val;
 162                 volume = fmr2->volume->cur.val;
 163                 break;
 164         default:
 165                 return -EINVAL;
 166         }
 167
 168         left = right = volume;
 169         if (balance < 0)
 170                 right = max(0, right + balance);
 171         if (balance > 0)
 172                 left = max(0, left - balance);
 173
 174         tc9154a_set_attenuation(fmr2, abs(left - 68), TC9154A_CHANNEL_LEFT);
 175         tc9154a_set_attenuation(fmr2, abs(right - 68), TC9154A_CHANNEL_RIGHT);
 176
 177         return 0;
 178 }
 179
 180 static const struct v4l2_ctrl_ops fmr2_ctrl_ops = {
 181         .s_ctrl = fmr2_s_ctrl,
 182 };
 183
 184 static int fmr2_tea_ext_init(struct snd_tea575x *tea)
 185 {
 186         struct fmr2 *fmr2 = tea->private_data;
 187
 188         /* FMR2 can have volume control, FMD2 can't (uses SB16 mixer) */
 189         if (!fmr2->is_fmd2 && inb(fmr2->io) & FMR2_HASVOL) {
 190                 fmr2->volume = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_VOLUME, 0, 68, 2, 56);
 191                 fmr2->balance = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_BALANCE, -68, 68, 2, 0);
 192                 if (tea->ctrl_handler.error) {
 193                         printk(KERN_ERR "radio-sf16fmr2: can't initialize controls\n");
 194                         return tea->ctrl_handler.error;
 195                 }
 196         }
 197
 198         return 0;
 199 }
 200
 201 static const struct pnp_device_id fmr2_pnp_ids[] = {
 202         { .id = "MFRad13" }, /* tuner subdevice of SF16-FMD2 */
 203         { .id = "" }
 204 };
 205 MODULE_DEVICE_TABLE(pnp, fmr2_pnp_ids);
 206
 207 static int fmr2_probe(struct fmr2 *fmr2, struct device *pdev, int io)
 208 {
 209         int err, i;
 210         char *card_name = fmr2->is_fmd2 ? "SF16-FMD2" : "SF16-FMR2";
 211
 212         /* avoid errors if a card was already registered at given port */
 213         for (i = 0; i < num_fmr2_cards; i++)
 214                 if (io == fmr2_cards[i]->io)
 215                         return -EBUSY;
 216
 217         strscpy(fmr2->v4l2_dev.name, "radio-sf16fmr2",
 218                 sizeof(fmr2->v4l2_dev.name));
 219         fmr2->io = io;
 220
 221         if (!request_region(fmr2->io, 2, fmr2->v4l2_dev.name)) {
 222                 printk(KERN_ERR "radio-sf16fmr2: I/O port 0x%x already in use\n", fmr2->io);
 223                 return -EBUSY;
 224         }
 225
 226         dev_set_drvdata(pdev, fmr2);
 227         err = v4l2_device_register(pdev, &fmr2->v4l2_dev);
 228         if (err < 0) {
 229                 v4l2_err(&fmr2->v4l2_dev, "Could not register v4l2_device\n");
 230                 release_region(fmr2->io, 2);
 231                 return err;
 232         }
 233         fmr2->tea.v4l2_dev = &fmr2->v4l2_dev;
 234         fmr2->tea.private_data = fmr2;
 235         fmr2->tea.radio_nr = radio_nr[num_fmr2_cards];
 236         fmr2->tea.ops = &fmr2_tea_ops;
 237         fmr2->tea.ext_init = fmr2_tea_ext_init;
 238         strscpy(fmr2->tea.card, card_name, sizeof(fmr2->tea.card));
 239         snprintf(fmr2->tea.bus_info, sizeof(fmr2->tea.bus_info), "%s:%s",
 240                         fmr2->is_fmd2 ? "PnP" : "ISA", dev_name(pdev));
 241
 242         if (snd_tea575x_init(&fmr2->tea, THIS_MODULE)) {
 243                 printk(KERN_ERR "radio-sf16fmr2: Unable to detect TEA575x tuner\n");
 244                 release_region(fmr2->io, 2);
 245                 return -ENODEV;
 246         }
 247
 248         printk(KERN_INFO "radio-sf16fmr2: %s radio card at 0x%x.\n",
 249                         card_name, fmr2->io);
 250         return 0;
 251 }
 252
 253 static int fmr2_isa_match(struct device *pdev, unsigned int ndev)
 254 {
 255         struct fmr2 *fmr2 = kzalloc(sizeof(*fmr2), GFP_KERNEL);
 256         if (!fmr2)
 257                 return 0;
 258
 259         if (fmr2_probe(fmr2, pdev, FMR2_PORT)) {
 260                 kfree(fmr2);
 261                 return 0;
 262         }
 263         dev_set_drvdata(pdev, fmr2);
 264         fmr2_cards[num_fmr2_cards++] = fmr2;
 265
 266         return 1;
 267 }
 268
 269 static int fmr2_pnp_probe(struct pnp_dev *pdev, const struct pnp_device_id *id)
 270 {
 271         int ret;
 272         struct fmr2 *fmr2 = kzalloc(sizeof(*fmr2), GFP_KERNEL);
 273         if (!fmr2)
 274                 return -ENOMEM;
 275
 276         fmr2->is_fmd2 = true;
 277         ret = fmr2_probe(fmr2, &pdev->dev, pnp_port_start(pdev, 0));
 278         if (ret) {
 279                 kfree(fmr2);
 280                 return ret;
 281         }
 282         pnp_set_drvdata(pdev, fmr2);
 283         fmr2_cards[num_fmr2_cards++] = fmr2;
 284
 285         return 0;
 286 }
 287
 288 static void fmr2_remove(struct fmr2 *fmr2)
 289 {
 290         snd_tea575x_exit(&fmr2->tea);
 291         release_region(fmr2->io, 2);
 292         v4l2_device_unregister(&fmr2->v4l2_dev);
 293         kfree(fmr2);
 294 }
 295
 296 static int fmr2_isa_remove(struct device *pdev, unsigned int ndev)
 297 {
 298         fmr2_remove(dev_get_drvdata(pdev));
 299
 300         return 0;
 301 }
 302
 303 static void fmr2_pnp_remove(struct pnp_dev *pdev)
 304 {
 305         fmr2_remove(pnp_get_drvdata(pdev));
 306         pnp_set_drvdata(pdev, NULL);
 307 }
 308
 309 static struct isa_driver fmr2_isa_driver = {
 310         .match          = fmr2_isa_match,
 311         .remove         = fmr2_isa_remove,
 312         .driver         = {
 313                 .name   = "radio-sf16fmr2",
 314         },
 315 };
 316
 317 static struct pnp_driver fmr2_pnp_driver = {
 318         .name           = "radio-sf16fmr2",
 319         .id_table       = fmr2_pnp_ids,
 320         .probe          = fmr2_pnp_probe,
 321         .remove         = fmr2_pnp_remove,
 322 };
 323
 324 static int __init fmr2_init(void)
 325 {
 326         int ret;
 327
 328         ret = pnp_register_driver(&fmr2_pnp_driver);
 329         if (!ret)
 330                 pnp_registered = true;
 331         ret = isa_register_driver(&fmr2_isa_driver, 1);
 332         if (!ret)
 333                 isa_registered = true;
 334
 335         return (pnp_registered || isa_registered) ? 0 : ret;
 336 }
 337
 338 static void __exit fmr2_exit(void)
 339 {
 340         if (pnp_registered)
 341                 pnp_unregister_driver(&fmr2_pnp_driver);
 342         if (isa_registered)
 343                 isa_unregister_driver(&fmr2_isa_driver);
 344 }
 345
 346 module_init(fmr2_init);
 347 module_exit(fmr2_exit);