linux/drivers/media/radio/radio-sf16fmr2.c
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   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 <sound/tea575x-tuner.h>
  18
  19MODULE_AUTHOR("Ondrej Zary");
  20MODULE_DESCRIPTION("MediaForte SF16-FMR2 and SF16-FMD2 FM radio card driver");
  21MODULE_LICENSE("GPL");
  22
  23/* these cards can only use two different ports (0x384 and 0x284) */
  24#define FMR2_MAX 2
  25
  26static int radio_nr[FMR2_MAX] = { [0 ... (FMR2_MAX - 1)] = -1 };
  27module_param_array(radio_nr, int, NULL, 0444);
  28MODULE_PARM_DESC(radio_nr, "Radio device numbers");
  29
  30struct 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
  39static int num_fmr2_cards;
  40static struct fmr2 *fmr2_cards[FMR2_MAX];
  41static bool isa_registered;
  42static 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
  59static 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
  72static 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
  81static void fmr2_tea575x_set_direction(struct snd_tea575x *tea, bool output)
  82{
  83}
  84
  85static 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
 115static 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
 123static 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
 148static 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
 179static const struct v4l2_ctrl_ops fmr2_ctrl_ops = {
 180        .s_ctrl = fmr2_s_ctrl,
 181};
 182
 183static 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
 200static struct pnp_device_id fmr2_pnp_ids[] __devinitdata = {
 201        { .id = "MFRad13" }, /* tuner subdevice of SF16-FMD2 */
 202        { .id = "" }
 203};
 204MODULE_DEVICE_TABLE(pnp, fmr2_pnp_ids);
 205
 206static int __devinit 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
 252static int __devinit 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
 268static int __devinit fmr2_pnp_probe(struct pnp_dev *pdev,
 269                                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
 288static void __devexit 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
 296static int __devexit fmr2_isa_remove(struct device *pdev, unsigned int ndev)
 297{
 298        fmr2_remove(dev_get_drvdata(pdev));
 299        dev_set_drvdata(pdev, NULL);
 300
 301        return 0;
 302}
 303
 304static void __devexit fmr2_pnp_remove(struct pnp_dev *pdev)
 305{
 306        fmr2_remove(pnp_get_drvdata(pdev));
 307        pnp_set_drvdata(pdev, NULL);
 308}
 309
 310struct isa_driver fmr2_isa_driver = {
 311        .match          = fmr2_isa_match,
 312        .remove         = __devexit_p(fmr2_isa_remove),
 313        .driver         = {
 314                .name   = "radio-sf16fmr2",
 315        },
 316};
 317
 318struct pnp_driver fmr2_pnp_driver = {
 319        .name           = "radio-sf16fmr2",
 320        .id_table       = fmr2_pnp_ids,
 321        .probe          = fmr2_pnp_probe,
 322        .remove         = __devexit_p(fmr2_pnp_remove),
 323};
 324
 325static int __init fmr2_init(void)
 326{
 327        int ret;
 328
 329        ret = pnp_register_driver(&fmr2_pnp_driver);
 330        if (!ret)
 331                pnp_registered = true;
 332        ret = isa_register_driver(&fmr2_isa_driver, 1);
 333        if (!ret)
 334                isa_registered = true;
 335
 336        return (pnp_registered || isa_registered) ? 0 : ret;
 337}
 338
 339static void __exit fmr2_exit(void)
 340{
 341        if (pnp_registered)
 342                pnp_unregister_driver(&fmr2_pnp_driver);
 343        if (isa_registered)
 344                isa_unregister_driver(&fmr2_isa_driver);
 345}
 346
 347module_init(fmr2_init);
 348module_exit(fmr2_exit);
 349