LXR linux/drivers/media/radio/radio-aztech.c

   1/*
   2 * radio-aztech.c - Aztech radio card driver
   3 *
   4 * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@xs4all.nl>
   5 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@kernel.org>
   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 * Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool.
  16*/
  17
  18#include <linux/module.h>       /* Modules                      */
  19#include <linux/init.h>         /* Initdata                     */
  20#include <linux/ioport.h>       /* request_region               */
  21#include <linux/delay.h>        /* udelay                       */
  22#include <linux/videodev2.h>    /* kernel radio structs         */
  23#include <linux/io.h>           /* outb, outb_p                 */
  24#include <linux/slab.h>
  25#include <media/v4l2-device.h>
  26#include <media/v4l2-ioctl.h>
  27#include <media/v4l2-ctrls.h>
  28#include "radio-isa.h"
  29#include "lm7000.h"
  30
  31MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
  32MODULE_DESCRIPTION("A driver for the Aztech radio card.");
  33MODULE_LICENSE("GPL");
  34MODULE_VERSION("1.0.0");
  35
  36/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
  37#ifndef CONFIG_RADIO_AZTECH_PORT
  38#define CONFIG_RADIO_AZTECH_PORT -1
  39#endif
  40
  41#define AZTECH_MAX 2
  42
  43static int io[AZTECH_MAX] = { [0] = CONFIG_RADIO_AZTECH_PORT,
  44                              [1 ... (AZTECH_MAX - 1)] = -1 };
  45static int radio_nr[AZTECH_MAX] = { [0 ... (AZTECH_MAX - 1)] = -1 };
  46
  47module_param_array(io, int, NULL, 0444);
  48MODULE_PARM_DESC(io, "I/O addresses of the Aztech card (0x350 or 0x358)");
  49module_param_array(radio_nr, int, NULL, 0444);
  50MODULE_PARM_DESC(radio_nr, "Radio device numbers");
  51
  52struct aztech {
  53        struct radio_isa_card isa;
  54        int curvol;
  55};
  56
  57/* bit definitions for register read */
  58#define AZTECH_BIT_NOT_TUNED    (1 << 0)
  59#define AZTECH_BIT_MONO         (1 << 1)
  60/* bit definitions for register write */
  61#define AZTECH_BIT_TUN_CE       (1 << 1)
  62#define AZTECH_BIT_TUN_CLK      (1 << 6)
  63#define AZTECH_BIT_TUN_DATA     (1 << 7)
  64/* bits 0 and 2 are volume control, bits 3..5 are not connected */
  65
  66static void aztech_set_pins(void *handle, u8 pins)
  67{
  68        struct radio_isa_card *isa = handle;
  69        struct aztech *az = container_of(isa, struct aztech, isa);
  70        u8 bits = az->curvol;
  71
  72        if (pins & LM7000_DATA)
  73                bits |= AZTECH_BIT_TUN_DATA;
  74        if (pins & LM7000_CLK)
  75                bits |= AZTECH_BIT_TUN_CLK;
  76        if (pins & LM7000_CE)
  77                bits |= AZTECH_BIT_TUN_CE;
  78
  79        outb_p(bits, az->isa.io);
  80}
  81
  82static struct radio_isa_card *aztech_alloc(void)
  83{
  84        struct aztech *az = kzalloc(sizeof(*az), GFP_KERNEL);
  85
  86        return az ? &az->isa : NULL;
  87}
  88
  89static int aztech_s_frequency(struct radio_isa_card *isa, u32 freq)
  90{
  91        lm7000_set_freq(freq, isa, aztech_set_pins);
  92
  93        return 0;
  94}
  95
  96static u32 aztech_g_rxsubchans(struct radio_isa_card *isa)
  97{
  98        if (inb(isa->io) & AZTECH_BIT_MONO)
  99                return V4L2_TUNER_SUB_MONO;
 100        return V4L2_TUNER_SUB_STEREO;
 101}
 102
 103static u32 aztech_g_signal(struct radio_isa_card *isa)
 104{
 105        return (inb(isa->io) & AZTECH_BIT_NOT_TUNED) ? 0 : 0xffff;
 106}
 107
 108static int aztech_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
 109{
 110        struct aztech *az = container_of(isa, struct aztech, isa);
 111
 112        if (mute)
 113                vol = 0;
 114        az->curvol = (vol & 1) + ((vol & 2) << 1);
 115        outb(az->curvol, isa->io);
 116        return 0;
 117}
 118
 119static const struct radio_isa_ops aztech_ops = {
 120        .alloc = aztech_alloc,
 121        .s_mute_volume = aztech_s_mute_volume,
 122        .s_frequency = aztech_s_frequency,
 123        .g_rxsubchans = aztech_g_rxsubchans,
 124        .g_signal = aztech_g_signal,
 125};
 126
 127static const int aztech_ioports[] = { 0x350, 0x358 };
 128
 129static struct radio_isa_driver aztech_driver = {
 130        .driver = {
 131                .match          = radio_isa_match,
 132                .probe          = radio_isa_probe,
 133                .remove         = radio_isa_remove,
 134                .driver         = {
 135                        .name   = "radio-aztech",
 136                },
 137        },
 138        .io_params = io,
 139        .radio_nr_params = radio_nr,
 140        .io_ports = aztech_ioports,
 141        .num_of_io_ports = ARRAY_SIZE(aztech_ioports),
 142        .region_size = 8,
 143        .card = "Aztech Radio",
 144        .ops = &aztech_ops,
 145        .has_stereo = true,
 146        .max_volume = 3,
 147};
 148
 149static int __init aztech_init(void)
 150{
 151        return isa_register_driver(&aztech_driver.driver, AZTECH_MAX);
 152}
 153
 154static void __exit aztech_exit(void)
 155{
 156        isa_unregister_driver(&aztech_driver.driver);
 157}
 158
 159module_init(aztech_init);
 160module_exit(aztech_exit);
 161