drivers/media/radio/radio-zoltrix.c

   1 /*
   2  * Zoltrix Radio Plus driver
   3  * Copyright 1998 C. van Schaik <carl@leg.uct.ac.za>
   4  *
   5  * BUGS
   6  *  Due to the inconsistency in reading from the signal flags
   7  *  it is difficult to get an accurate tuned signal.
   8  *
   9  *  It seems that the card is not linear to 0 volume. It cuts off
  10  *  at a low volume, and it is not possible (at least I have not found)
  11  *  to get fine volume control over the low volume range.
  12  *
  13  *  Some code derived from code by Romolo Manfredini
  14  *                                 romolo@bicnet.it
  15  *
  16  * 1999-05-06 - (C. van Schaik)
  17  *            - Make signal strength and stereo scans
  18  *              kinder to cpu while in delay
  19  * 1999-01-05 - (C. van Schaik)
  20  *            - Changed tuning to 1/160Mhz accuracy
  21  *            - Added stereo support
  22  *              (card defaults to stereo)
  23  *              (can explicitly force mono on the card)
  24  *              (can detect if station is in stereo)
  25  *            - Added unmute function
  26  *            - Reworked ioctl functions
  27  * 2002-07-15 - Fix Stereo typo
  28  *
  29  * 2006-07-24 - Converted to V4L2 API
  30  *              by Mauro Carvalho Chehab <mchehab@infradead.org>
  31  *
  32  * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>
  33  *
  34  * Note that this is the driver for the Zoltrix Radio Plus.
  35  * This driver does not work for the Zoltrix Radio Plus 108 or the
  36  * Zoltrix Radio Plus for Windows.
  37  *
  38  * Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool.
  39  */
  40
  41 #include <linux/module.h>       /* Modules                        */
  42 #include <linux/init.h>         /* Initdata                       */
  43 #include <linux/ioport.h>       /* request_region                 */
  44 #include <linux/delay.h>        /* udelay, msleep                 */
  45 #include <linux/videodev2.h>    /* kernel radio structs           */
  46 #include <linux/mutex.h>
  47 #include <linux/io.h>           /* outb, outb_p                   */
  48 #include <linux/slab.h>
  49 #include <media/v4l2-device.h>
  50 #include <media/v4l2-ioctl.h>
  51 #include "radio-isa.h"
  52
  53 MODULE_AUTHOR("C. van Schaik");
  54 MODULE_DESCRIPTION("A driver for the Zoltrix Radio Plus.");
  55 MODULE_LICENSE("GPL");
  56 MODULE_VERSION("0.1.99");
  57
  58 #ifndef CONFIG_RADIO_ZOLTRIX_PORT
  59 #define CONFIG_RADIO_ZOLTRIX_PORT -1
  60 #endif
  61
  62 #define ZOLTRIX_MAX 2
  63
  64 static int io[ZOLTRIX_MAX] = { [0] = CONFIG_RADIO_ZOLTRIX_PORT,
  65                                [1 ... (ZOLTRIX_MAX - 1)] = -1 };
  66 static int radio_nr[ZOLTRIX_MAX] = { [0 ... (ZOLTRIX_MAX - 1)] = -1 };
  67
  68 module_param_array(io, int, NULL, 0444);
  69 MODULE_PARM_DESC(io, "I/O addresses of the Zoltrix Radio Plus card (0x20c or 0x30c)");
  70 module_param_array(radio_nr, int, NULL, 0444);
  71 MODULE_PARM_DESC(radio_nr, "Radio device numbers");
  72
  73 struct zoltrix {
  74         struct radio_isa_card isa;
  75         int curvol;
  76         bool muted;
  77 };
  78
  79 static struct radio_isa_card *zoltrix_alloc(void)
  80 {
  81         struct zoltrix *zol = kzalloc(sizeof(*zol), GFP_KERNEL);
  82
  83         return zol ? &zol->isa : NULL;
  84 }
  85
  86 static int zoltrix_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
  87 {
  88         struct zoltrix *zol = container_of(isa, struct zoltrix, isa);
  89
  90         zol->curvol = vol;
  91         zol->muted = mute;
  92         if (mute || vol == 0) {
  93                 outb(0, isa->io);
  94                 outb(0, isa->io);
  95                 inb(isa->io + 3);            /* Zoltrix needs to be read to confirm */
  96                 return 0;
  97         }
  98
  99         outb(vol - 1, isa->io);
 100         msleep(10);
 101         inb(isa->io + 2);
 102         return 0;
 103 }
 104
 105 /* tunes the radio to the desired frequency */
 106 static int zoltrix_s_frequency(struct radio_isa_card *isa, u32 freq)
 107 {
 108         struct zoltrix *zol = container_of(isa, struct zoltrix, isa);
 109         struct v4l2_device *v4l2_dev = &isa->v4l2_dev;
 110         unsigned long long bitmask, f, m;
 111         bool stereo = isa->stereo;
 112         int i;
 113
 114         if (freq == 0) {
 115                 v4l2_warn(v4l2_dev, "cannot set a frequency of 0.\n");
 116                 return -EINVAL;
 117         }
 118
 119         m = (freq / 160 - 8800) * 2;
 120         f = (unsigned long long)m + 0x4d1c;
 121
 122         bitmask = 0xc480402c10080000ull;
 123         i = 45;
 124
 125         outb(0, isa->io);
 126         outb(0, isa->io);
 127         inb(isa->io + 3);            /* Zoltrix needs to be read to confirm */
 128
 129         outb(0x40, isa->io);
 130         outb(0xc0, isa->io);
 131
 132         bitmask = (bitmask ^ ((f & 0xff) << 47) ^ ((f & 0xff00) << 30) ^ (stereo << 31));
 133         while (i--) {
 134                 if ((bitmask & 0x8000000000000000ull) != 0) {
 135                         outb(0x80, isa->io);
 136                         udelay(50);
 137                         outb(0x00, isa->io);
 138                         udelay(50);
 139                         outb(0x80, isa->io);
 140                         udelay(50);
 141                 } else {
 142                         outb(0xc0, isa->io);
 143                         udelay(50);
 144                         outb(0x40, isa->io);
 145                         udelay(50);
 146                         outb(0xc0, isa->io);
 147                         udelay(50);
 148                 }
 149                 bitmask *= 2;
 150         }
 151         /* termination sequence */
 152         outb(0x80, isa->io);
 153         outb(0xc0, isa->io);
 154         outb(0x40, isa->io);
 155         udelay(1000);
 156         inb(isa->io + 2);
 157         udelay(1000);
 158
 159         return zoltrix_s_mute_volume(isa, zol->muted, zol->curvol);
 160 }
 161
 162 /* Get signal strength */
 163 static u32 zoltrix_g_rxsubchans(struct radio_isa_card *isa)
 164 {
 165         struct zoltrix *zol = container_of(isa, struct zoltrix, isa);
 166         int a, b;
 167
 168         outb(0x00, isa->io);         /* This stuff I found to do nothing */
 169         outb(zol->curvol, isa->io);
 170         msleep(20);
 171
 172         a = inb(isa->io);
 173         msleep(10);
 174         b = inb(isa->io);
 175
 176         return (a == b && a == 0xcf) ?
 177                 V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
 178 }
 179
 180 static u32 zoltrix_g_signal(struct radio_isa_card *isa)
 181 {
 182         struct zoltrix *zol = container_of(isa, struct zoltrix, isa);
 183         int a, b;
 184
 185         outb(0x00, isa->io);         /* This stuff I found to do nothing */
 186         outb(zol->curvol, isa->io);
 187         msleep(20);
 188
 189         a = inb(isa->io);
 190         msleep(10);
 191         b = inb(isa->io);
 192
 193         if (a != b)
 194                 return 0;
 195
 196         /* I found this out by playing with a binary scanner on the card io */
 197         return (a == 0xcf || a == 0xdf || a == 0xef) ? 0xffff : 0;
 198 }
 199
 200 static int zoltrix_s_stereo(struct radio_isa_card *isa, bool stereo)
 201 {
 202         return zoltrix_s_frequency(isa, isa->freq);
 203 }
 204
 205 static const struct radio_isa_ops zoltrix_ops = {
 206         .alloc = zoltrix_alloc,
 207         .s_mute_volume = zoltrix_s_mute_volume,
 208         .s_frequency = zoltrix_s_frequency,
 209         .s_stereo = zoltrix_s_stereo,
 210         .g_rxsubchans = zoltrix_g_rxsubchans,
 211         .g_signal = zoltrix_g_signal,
 212 };
 213
 214 static const int zoltrix_ioports[] = { 0x20c, 0x30c };
 215
 216 static struct radio_isa_driver zoltrix_driver = {
 217         .driver = {
 218                 .match          = radio_isa_match,
 219                 .probe          = radio_isa_probe,
 220                 .remove         = radio_isa_remove,
 221                 .driver         = {
 222                         .name   = "radio-zoltrix",
 223                 },
 224         },
 225         .io_params = io,
 226         .radio_nr_params = radio_nr,
 227         .io_ports = zoltrix_ioports,
 228         .num_of_io_ports = ARRAY_SIZE(zoltrix_ioports),
 229         .region_size = 2,
 230         .card = "Zoltrix Radio Plus",
 231         .ops = &zoltrix_ops,
 232         .has_stereo = true,
 233         .max_volume = 15,
 234 };
 235
 236 static int __init zoltrix_init(void)
 237 {
 238         return isa_register_driver(&zoltrix_driver.driver, ZOLTRIX_MAX);
 239 }
 240
 241 static void __exit zoltrix_exit(void)
 242 {
 243         isa_unregister_driver(&zoltrix_driver.driver);
 244 }
 245
 246 module_init(zoltrix_init);
 247 module_exit(zoltrix_exit);
 248