1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * RadioTrack II driver 4 * Copyright 1998 Ben Pfaff 5 * 6 * Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood 7 * Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk> 8 * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org> 9 * 10 * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com> 11 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@kernel.org> 12 * 13 * Fully tested with actual hardware and the v4l2-compliance tool. 14 */ 15 16 #include <linux/module.h> /* Modules */ 17 #include <linux/init.h> /* Initdata */ 18 #include <linux/ioport.h> /* request_region */ 19 #include <linux/delay.h> /* udelay */ 20 #include <linux/videodev2.h> /* kernel radio structs */ 21 #include <linux/mutex.h> 22 #include <linux/io.h> /* outb, outb_p */ 23 #include <linux/slab.h> 24 #include <media/v4l2-device.h> 25 #include <media/v4l2-ioctl.h> 26 #include "radio-isa.h" 27 28 MODULE_AUTHOR("Ben Pfaff"); 29 MODULE_DESCRIPTION("A driver for the RadioTrack II radio card."); 30 MODULE_LICENSE("GPL"); 31 MODULE_VERSION("0.1.99"); 32 33 #ifndef CONFIG_RADIO_RTRACK2_PORT 34 #define CONFIG_RADIO_RTRACK2_PORT -1 35 #endif 36 37 #define RTRACK2_MAX 2 38 39 static int io[RTRACK2_MAX] = { [0] = CONFIG_RADIO_RTRACK2_PORT, 40 [1 ... (RTRACK2_MAX - 1)] = -1 }; 41 static int radio_nr[RTRACK2_MAX] = { [0 ... (RTRACK2_MAX - 1)] = -1 }; 42 43 module_param_array(io, int, NULL, 0444); 44 MODULE_PARM_DESC(io, "I/O addresses of the RadioTrack card (0x20f or 0x30f)"); 45 module_param_array(radio_nr, int, NULL, 0444); 46 MODULE_PARM_DESC(radio_nr, "Radio device numbers"); 47 48 static struct radio_isa_card *rtrack2_alloc(void) 49 { 50 return kzalloc(sizeof(struct radio_isa_card), GFP_KERNEL); 51 } 52 53 static void zero(struct radio_isa_card *isa) 54 { 55 outb_p(1, isa->io); 56 outb_p(3, isa->io); 57 outb_p(1, isa->io); 58 } 59 60 static void one(struct radio_isa_card *isa) 61 { 62 outb_p(5, isa->io); 63 outb_p(7, isa->io); 64 outb_p(5, isa->io); 65 } 66 67 static int rtrack2_s_frequency(struct radio_isa_card *isa, u32 freq) 68 { 69 int i; 70 71 freq = freq / 200 + 856; 72 73 outb_p(0xc8, isa->io); 74 outb_p(0xc9, isa->io); 75 outb_p(0xc9, isa->io); 76 77 for (i = 0; i < 10; i++) 78 zero(isa); 79 80 for (i = 14; i >= 0; i--) 81 if (freq & (1 << i)) 82 one(isa); 83 else 84 zero(isa); 85 86 outb_p(0xc8, isa->io); 87 outb_p(v4l2_ctrl_g_ctrl(isa->mute), isa->io); 88 return 0; 89 } 90 91 static u32 rtrack2_g_signal(struct radio_isa_card *isa) 92 { 93 /* bit set = no signal present */ 94 return (inb(isa->io) & 2) ? 0 : 0xffff; 95 } 96 97 static int rtrack2_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol) 98 { 99 outb(mute, isa->io); 100 return 0; 101 } 102 103 static const struct radio_isa_ops rtrack2_ops = { 104 .alloc = rtrack2_alloc, 105 .s_mute_volume = rtrack2_s_mute_volume, 106 .s_frequency = rtrack2_s_frequency, 107 .g_signal = rtrack2_g_signal, 108 }; 109 110 static const int rtrack2_ioports[] = { 0x20f, 0x30f }; 111 112 static struct radio_isa_driver rtrack2_driver = { 113 .driver = { 114 .match = radio_isa_match, 115 .probe = radio_isa_probe, 116 .remove = radio_isa_remove, 117 .driver = { 118 .name = "radio-rtrack2", 119 }, 120 }, 121 .io_params = io, 122 .radio_nr_params = radio_nr, 123 .io_ports = rtrack2_ioports, 124 .num_of_io_ports = ARRAY_SIZE(rtrack2_ioports), 125 .region_size = 4, 126 .card = "AIMSlab RadioTrack II", 127 .ops = &rtrack2_ops, 128 .has_stereo = true, 129 }; 130 131 static int __init rtrack2_init(void) 132 { 133 return isa_register_driver(&rtrack2_driver.driver, RTRACK2_MAX); 134 } 135 136 static void __exit rtrack2_exit(void) 137 { 138 isa_unregister_driver(&rtrack2_driver.driver); 139 } 140 141 module_init(rtrack2_init); 142 module_exit(rtrack2_exit); 143