radio-rtrack2.c

  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 <hverkuil@kernel.org>
 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
 28MODULE_AUTHOR("Ben Pfaff");
 29MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
 30MODULE_LICENSE("GPL");
 31MODULE_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
 39static int io[RTRACK2_MAX] = { [0] = CONFIG_RADIO_RTRACK2_PORT,
 40			      [1 ... (RTRACK2_MAX - 1)] = -1 };
 41static int radio_nr[RTRACK2_MAX] = { [0 ... (RTRACK2_MAX - 1)] = -1 };
 42
 43module_param_array(io, int, NULL, 0444);
 44MODULE_PARM_DESC(io, "I/O addresses of the RadioTrack card (0x20f or 0x30f)");
 45module_param_array(radio_nr, int, NULL, 0444);
 46MODULE_PARM_DESC(radio_nr, "Radio device numbers");
 47
 48static struct radio_isa_card *rtrack2_alloc(void)
 49{
 50	return kzalloc(sizeof(struct radio_isa_card), GFP_KERNEL);
 51}
 52
 53static 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
 60static 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
 67static 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
 91static 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
 97static 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
103static 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
110static const int rtrack2_ioports[] = { 0x20f, 0x30f };
111
112static 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
131static int __init rtrack2_init(void)
132{
133	return isa_register_driver(&rtrack2_driver.driver, RTRACK2_MAX);
134}
135
136static void __exit rtrack2_exit(void)
137{
138	isa_unregister_driver(&rtrack2_driver.driver);
139}
140
141module_init(rtrack2_init);
142module_exit(rtrack2_exit);