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