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
  31 MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
  32 MODULE_DESCRIPTION("A driver for the Aztech radio card.");
  33 MODULE_LICENSE("GPL");
  34 MODULE_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
  43 static int io[AZTECH_MAX] = { [0] = CONFIG_RADIO_AZTECH_PORT,
  44                               [1 ... (AZTECH_MAX - 1)] = -1 };
  45 static int radio_nr[AZTECH_MAX] = { [0 ... (AZTECH_MAX - 1)] = -1 };
  46
  47 module_param_array(io, int, NULL, 0444);
  48 MODULE_PARM_DESC(io, "I/O addresses of the Aztech card (0x350 or 0x358)");
  49 module_param_array(radio_nr, int, NULL, 0444);
  50 MODULE_PARM_DESC(radio_nr, "Radio device numbers");
  51
  52 struct 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
  66 static 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
  82 static 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
  89 static 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
  96 static 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
 103 static u32 aztech_g_signal(struct radio_isa_card *isa)
 104 {
 105         return (inb(isa->io) & AZTECH_BIT_NOT_TUNED) ? 0 : 0xffff;
 106 }
 107
 108 static 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
 119 static 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
 127 static const int aztech_ioports[] = { 0x350, 0x358 };
 128
 129 static 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
 149 static int __init aztech_init(void)
 150 {
 151         return isa_register_driver(&aztech_driver.driver, AZTECH_MAX);
 152 }
 153
 154 static void __exit aztech_exit(void)
 155 {
 156         isa_unregister_driver(&aztech_driver.driver);
 157 }
 158
 159 module_init(aztech_init);
 160 module_exit(aztech_exit);