linux/drivers/media/radio/radio-trust.c
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   1/* radio-trust.c - Trust FM Radio card driver for Linux 2.2
   2 * by Eric Lammerts <eric@scintilla.utwente.nl>
   3 *
   4 * Based on radio-aztech.c. Original notes:
   5 *
   6 * Adapted to support the Video for Linux API by
   7 * Russell Kroll <rkroll@exploits.org>.  Based on original tuner code by:
   8 *
   9 * Quay Ly
  10 * Donald Song
  11 * Jason Lewis      (jlewis@twilight.vtc.vsc.edu)
  12 * Scott McGrath    (smcgrath@twilight.vtc.vsc.edu)
  13 * William McGrath  (wmcgrath@twilight.vtc.vsc.edu)
  14 *
  15 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  16 */
  17
  18#include <stdarg.h>
  19#include <linux/module.h>
  20#include <linux/init.h>
  21#include <linux/ioport.h>
  22#include <linux/videodev2.h>
  23#include <linux/io.h>
  24#include <linux/slab.h>
  25#include <media/v4l2-device.h>
  26#include <media/v4l2-ioctl.h>
  27#include "radio-isa.h"
  28
  29MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
  30MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
  31MODULE_LICENSE("GPL");
  32MODULE_VERSION("0.1.99");
  33
  34/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
  35
  36#ifndef CONFIG_RADIO_TRUST_PORT
  37#define CONFIG_RADIO_TRUST_PORT -1
  38#endif
  39
  40#define TRUST_MAX 2
  41
  42static int io[TRUST_MAX] = { [0] = CONFIG_RADIO_TRUST_PORT,
  43                              [1 ... (TRUST_MAX - 1)] = -1 };
  44static int radio_nr[TRUST_MAX] = { [0 ... (TRUST_MAX - 1)] = -1 };
  45
  46module_param_array(io, int, NULL, 0444);
  47MODULE_PARM_DESC(io, "I/O addresses of the Trust FM Radio card (0x350 or 0x358)");
  48module_param_array(radio_nr, int, NULL, 0444);
  49MODULE_PARM_DESC(radio_nr, "Radio device numbers");
  50
  51struct trust {
  52        struct radio_isa_card isa;
  53        int ioval;
  54};
  55
  56static struct radio_isa_card *trust_alloc(void)
  57{
  58        struct trust *tr = kzalloc(sizeof(*tr), GFP_KERNEL);
  59
  60        return tr ? &tr->isa : NULL;
  61}
  62
  63/* i2c addresses */
  64#define TDA7318_ADDR 0x88
  65#define TSA6060T_ADDR 0xc4
  66
  67#define TR_DELAY do { inb(tr->isa.io); inb(tr->isa.io); inb(tr->isa.io); } while (0)
  68#define TR_SET_SCL outb(tr->ioval |= 2, tr->isa.io)
  69#define TR_CLR_SCL outb(tr->ioval &= 0xfd, tr->isa.io)
  70#define TR_SET_SDA outb(tr->ioval |= 1, tr->isa.io)
  71#define TR_CLR_SDA outb(tr->ioval &= 0xfe, tr->isa.io)
  72
  73static void write_i2c(struct trust *tr, int n, ...)
  74{
  75        unsigned char val, mask;
  76        va_list args;
  77
  78        va_start(args, n);
  79
  80        /* start condition */
  81        TR_SET_SDA;
  82        TR_SET_SCL;
  83        TR_DELAY;
  84        TR_CLR_SDA;
  85        TR_CLR_SCL;
  86        TR_DELAY;
  87
  88        for (; n; n--) {
  89                val = va_arg(args, unsigned);
  90                for (mask = 0x80; mask; mask >>= 1) {
  91                        if (val & mask)
  92                                TR_SET_SDA;
  93                        else
  94                                TR_CLR_SDA;
  95                        TR_SET_SCL;
  96                        TR_DELAY;
  97                        TR_CLR_SCL;
  98                        TR_DELAY;
  99                }
 100                /* acknowledge bit */
 101                TR_SET_SDA;
 102                TR_SET_SCL;
 103                TR_DELAY;
 104                TR_CLR_SCL;
 105                TR_DELAY;
 106        }
 107
 108        /* stop condition */
 109        TR_CLR_SDA;
 110        TR_DELAY;
 111        TR_SET_SCL;
 112        TR_DELAY;
 113        TR_SET_SDA;
 114        TR_DELAY;
 115
 116        va_end(args);
 117}
 118
 119static int trust_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
 120{
 121        struct trust *tr = container_of(isa, struct trust, isa);
 122
 123        tr->ioval = (tr->ioval & 0xf7) | (mute << 3);
 124        outb(tr->ioval, isa->io);
 125        write_i2c(tr, 2, TDA7318_ADDR, vol ^ 0x1f);
 126        return 0;
 127}
 128
 129static int trust_s_stereo(struct radio_isa_card *isa, bool stereo)
 130{
 131        struct trust *tr = container_of(isa, struct trust, isa);
 132
 133        tr->ioval = (tr->ioval & 0xfb) | (!stereo << 2);
 134        outb(tr->ioval, isa->io);
 135        return 0;
 136}
 137
 138static u32 trust_g_signal(struct radio_isa_card *isa)
 139{
 140        int i, v;
 141
 142        for (i = 0, v = 0; i < 100; i++)
 143                v |= inb(isa->io);
 144        return (v & 1) ? 0 : 0xffff;
 145}
 146
 147static int trust_s_frequency(struct radio_isa_card *isa, u32 freq)
 148{
 149        struct trust *tr = container_of(isa, struct trust, isa);
 150
 151        freq /= 160;    /* Convert to 10 kHz units      */
 152        freq += 1070;   /* Add 10.7 MHz IF              */
 153        write_i2c(tr, 5, TSA6060T_ADDR, (freq << 1) | 1,
 154                        freq >> 7, 0x60 | ((freq >> 15) & 1), 0);
 155        return 0;
 156}
 157
 158static int basstreble2chip[15] = {
 159        0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
 160};
 161
 162static int trust_s_ctrl(struct v4l2_ctrl *ctrl)
 163{
 164        struct radio_isa_card *isa =
 165                container_of(ctrl->handler, struct radio_isa_card, hdl);
 166        struct trust *tr = container_of(isa, struct trust, isa);
 167
 168        switch (ctrl->id) {
 169        case V4L2_CID_AUDIO_BASS:
 170                write_i2c(tr, 2, TDA7318_ADDR, 0x60 | basstreble2chip[ctrl->val]);
 171                return 0;
 172        case V4L2_CID_AUDIO_TREBLE:
 173                write_i2c(tr, 2, TDA7318_ADDR, 0x70 | basstreble2chip[ctrl->val]);
 174                return 0;
 175        }
 176        return -EINVAL;
 177}
 178
 179static const struct v4l2_ctrl_ops trust_ctrl_ops = {
 180        .s_ctrl = trust_s_ctrl,
 181};
 182
 183static int trust_initialize(struct radio_isa_card *isa)
 184{
 185        struct trust *tr = container_of(isa, struct trust, isa);
 186
 187        tr->ioval = 0xf;
 188        write_i2c(tr, 2, TDA7318_ADDR, 0x80);   /* speaker att. LF = 0 dB */
 189        write_i2c(tr, 2, TDA7318_ADDR, 0xa0);   /* speaker att. RF = 0 dB */
 190        write_i2c(tr, 2, TDA7318_ADDR, 0xc0);   /* speaker att. LR = 0 dB */
 191        write_i2c(tr, 2, TDA7318_ADDR, 0xe0);   /* speaker att. RR = 0 dB */
 192        write_i2c(tr, 2, TDA7318_ADDR, 0x40);   /* stereo 1 input, gain = 18.75 dB */
 193
 194        v4l2_ctrl_new_std(&isa->hdl, &trust_ctrl_ops,
 195                                V4L2_CID_AUDIO_BASS, 0, 15, 1, 8);
 196        v4l2_ctrl_new_std(&isa->hdl, &trust_ctrl_ops,
 197                                V4L2_CID_AUDIO_TREBLE, 0, 15, 1, 8);
 198        return isa->hdl.error;
 199}
 200
 201static const struct radio_isa_ops trust_ops = {
 202        .init = trust_initialize,
 203        .alloc = trust_alloc,
 204        .s_mute_volume = trust_s_mute_volume,
 205        .s_frequency = trust_s_frequency,
 206        .s_stereo = trust_s_stereo,
 207        .g_signal = trust_g_signal,
 208};
 209
 210static const int trust_ioports[] = { 0x350, 0x358 };
 211
 212static struct radio_isa_driver trust_driver = {
 213        .driver = {
 214                .match          = radio_isa_match,
 215                .probe          = radio_isa_probe,
 216                .remove         = radio_isa_remove,
 217                .driver         = {
 218                        .name   = "radio-trust",
 219                },
 220        },
 221        .io_params = io,
 222        .radio_nr_params = radio_nr,
 223        .io_ports = trust_ioports,
 224        .num_of_io_ports = ARRAY_SIZE(trust_ioports),
 225        .region_size = 2,
 226        .card = "Trust FM Radio",
 227        .ops = &trust_ops,
 228        .has_stereo = true,
 229        .max_volume = 31,
 230};
 231
 232static int __init trust_init(void)
 233{
 234        return isa_register_driver(&trust_driver.driver, TRUST_MAX);
 235}
 236
 237static void __exit trust_exit(void)
 238{
 239        isa_unregister_driver(&trust_driver.driver);
 240}
 241
 242module_init(trust_init);
 243module_exit(trust_exit);
 244