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