drivers/media/radio/radio-trust.c

   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
  29 MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
  30 MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
  31 MODULE_LICENSE("GPL");
  32 MODULE_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
  42 static int io[TRUST_MAX] = { [0] = CONFIG_RADIO_TRUST_PORT,
  43                               [1 ... (TRUST_MAX - 1)] = -1 };
  44 static int radio_nr[TRUST_MAX] = { [0 ... (TRUST_MAX - 1)] = -1 };
  45
  46 module_param_array(io, int, NULL, 0444);
  47 MODULE_PARM_DESC(io, "I/O addresses of the Trust FM Radio card (0x350 or 0x358)");
  48 module_param_array(radio_nr, int, NULL, 0444);
  49 MODULE_PARM_DESC(radio_nr, "Radio device numbers");
  50
  51 struct trust {
  52         struct radio_isa_card isa;
  53         int ioval;
  54 };
  55
  56 static 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
  73 static 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
 119 static 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
 129 static 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
 138 static 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
 147 static 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
 158 static int basstreble2chip[15] = {
 159         0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
 160 };
 161
 162 static 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
 179 static const struct v4l2_ctrl_ops trust_ctrl_ops = {
 180         .s_ctrl = trust_s_ctrl,
 181 };
 182
 183 static 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
 201 static 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
 210 static const int trust_ioports[] = { 0x350, 0x358 };
 211
 212 static 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
 232 static int __init trust_init(void)
 233 {
 234         return isa_register_driver(&trust_driver.driver, TRUST_MAX);
 235 }
 236
 237 static void __exit trust_exit(void)
 238 {
 239         isa_unregister_driver(&trust_driver.driver);
 240 }
 241
 242 module_init(trust_init);
 243 module_exit(trust_exit);