drivers/media/radio/radio-aztech.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * radio-aztech.c - Aztech radio card driver
   4  *
   5  * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@xs4all.nl>
   6  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@kernel.org>
   7  * Adapted to support the Video for Linux API by
   8  * Russell Kroll <rkroll@exploits.org>.  Based on original tuner code by:
   9  *
  10  * Quay Ly
  11  * Donald Song
  12  * Jason Lewis      (jlewis@twilight.vtc.vsc.edu)
  13  * Scott McGrath    (smcgrath@twilight.vtc.vsc.edu)
  14  * William McGrath  (wmcgrath@twilight.vtc.vsc.edu)
  15  *
  16  * Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool.
  17 */
  18
  19 #include <linux/module.h>       /* Modules                      */
  20 #include <linux/init.h>         /* Initdata                     */
  21 #include <linux/ioport.h>       /* request_region               */
  22 #include <linux/delay.h>        /* udelay                       */
  23 #include <linux/videodev2.h>    /* kernel radio structs         */
  24 #include <linux/io.h>           /* outb, outb_p                 */
  25 #include <linux/slab.h>
  26 #include <media/v4l2-device.h>
  27 #include <media/v4l2-ioctl.h>
  28 #include <media/v4l2-ctrls.h>
  29 #include "radio-isa.h"
  30 #include "lm7000.h"
  31
  32 MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
  33 MODULE_DESCRIPTION("A driver for the Aztech radio card.");
  34 MODULE_LICENSE("GPL");
  35 MODULE_VERSION("1.0.0");
  36
  37 /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
  38 #ifndef CONFIG_RADIO_AZTECH_PORT
  39 #define CONFIG_RADIO_AZTECH_PORT -1
  40 #endif
  41
  42 #define AZTECH_MAX 2
  43
  44 static int io[AZTECH_MAX] = { [0] = CONFIG_RADIO_AZTECH_PORT,
  45                               [1 ... (AZTECH_MAX - 1)] = -1 };
  46 static int radio_nr[AZTECH_MAX] = { [0 ... (AZTECH_MAX - 1)] = -1 };
  47
  48 module_param_array(io, int, NULL, 0444);
  49 MODULE_PARM_DESC(io, "I/O addresses of the Aztech card (0x350 or 0x358)");
  50 module_param_array(radio_nr, int, NULL, 0444);
  51 MODULE_PARM_DESC(radio_nr, "Radio device numbers");
  52
  53 struct aztech {
  54         struct radio_isa_card isa;
  55         int curvol;
  56 };
  57
  58 /* bit definitions for register read */
  59 #define AZTECH_BIT_NOT_TUNED    (1 << 0)
  60 #define AZTECH_BIT_MONO         (1 << 1)
  61 /* bit definitions for register write */
  62 #define AZTECH_BIT_TUN_CE       (1 << 1)
  63 #define AZTECH_BIT_TUN_CLK      (1 << 6)
  64 #define AZTECH_BIT_TUN_DATA     (1 << 7)
  65 /* bits 0 and 2 are volume control, bits 3..5 are not connected */
  66
  67 static void aztech_set_pins(void *handle, u8 pins)
  68 {
  69         struct radio_isa_card *isa = handle;
  70         struct aztech *az = container_of(isa, struct aztech, isa);
  71         u8 bits = az->curvol;
  72
  73         if (pins & LM7000_DATA)
  74                 bits |= AZTECH_BIT_TUN_DATA;
  75         if (pins & LM7000_CLK)
  76                 bits |= AZTECH_BIT_TUN_CLK;
  77         if (pins & LM7000_CE)
  78                 bits |= AZTECH_BIT_TUN_CE;
  79
  80         outb_p(bits, az->isa.io);
  81 }
  82
  83 static struct radio_isa_card *aztech_alloc(void)
  84 {
  85         struct aztech *az = kzalloc(sizeof(*az), GFP_KERNEL);
  86
  87         return az ? &az->isa : NULL;
  88 }
  89
  90 static int aztech_s_frequency(struct radio_isa_card *isa, u32 freq)
  91 {
  92         lm7000_set_freq(freq, isa, aztech_set_pins);
  93
  94         return 0;
  95 }
  96
  97 static u32 aztech_g_rxsubchans(struct radio_isa_card *isa)
  98 {
  99         if (inb(isa->io) & AZTECH_BIT_MONO)
 100                 return V4L2_TUNER_SUB_MONO;
 101         return V4L2_TUNER_SUB_STEREO;
 102 }
 103
 104 static u32 aztech_g_signal(struct radio_isa_card *isa)
 105 {
 106         return (inb(isa->io) & AZTECH_BIT_NOT_TUNED) ? 0 : 0xffff;
 107 }
 108
 109 static int aztech_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
 110 {
 111         struct aztech *az = container_of(isa, struct aztech, isa);
 112
 113         if (mute)
 114                 vol = 0;
 115         az->curvol = (vol & 1) + ((vol & 2) << 1);
 116         outb(az->curvol, isa->io);
 117         return 0;
 118 }
 119
 120 static const struct radio_isa_ops aztech_ops = {
 121         .alloc = aztech_alloc,
 122         .s_mute_volume = aztech_s_mute_volume,
 123         .s_frequency = aztech_s_frequency,
 124         .g_rxsubchans = aztech_g_rxsubchans,
 125         .g_signal = aztech_g_signal,
 126 };
 127
 128 static const int aztech_ioports[] = { 0x350, 0x358 };
 129
 130 static struct radio_isa_driver aztech_driver = {
 131         .driver = {
 132                 .match          = radio_isa_match,
 133                 .probe          = radio_isa_probe,
 134                 .remove         = radio_isa_remove,
 135                 .driver         = {
 136                         .name   = "radio-aztech",
 137                 },
 138         },
 139         .io_params = io,
 140         .radio_nr_params = radio_nr,
 141         .io_ports = aztech_ioports,
 142         .num_of_io_ports = ARRAY_SIZE(aztech_ioports),
 143         .region_size = 8,
 144         .card = "Aztech Radio",
 145         .ops = &aztech_ops,
 146         .has_stereo = true,
 147         .max_volume = 3,
 148 };
 149
 150 static int __init aztech_init(void)
 151 {
 152         return isa_register_driver(&aztech_driver.driver, AZTECH_MAX);
 153 }
 154
 155 static void __exit aztech_exit(void)
 156 {
 157         isa_unregister_driver(&aztech_driver.driver);
 158 }
 159
 160 module_init(aztech_init);
 161 module_exit(aztech_exit);