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