1/* Terratec ActiveRadio ISA Standalone card driver for Linux radio support
2 * (c) 1999 R. Offermanns (rolf@offermanns.de)
3 * based on the aimslab radio driver from M. Kirkwood
4 * many thanks to Michael Becker and Friedhelm Birth (from TerraTec)
5 *
6 *
7 * History:
8 * 1999-05-21	First preview release
9 *
10 *  Notes on the hardware:
11 *  There are two "main" chips on the card:
12 *  - Philips OM5610 (http://www-us.semiconductors.philips.com/acrobat/datasheets/OM5610_2.pdf)
13 *  - Philips SAA6588 (http://www-us.semiconductors.philips.com/acrobat/datasheets/SAA6588_1.pdf)
14 *  (you can get the datasheet at the above links)
15 *
16 *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
17 *  Volume Control is done digitally
18 *
19 * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>
20 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
21 */
22
23#include <linux/module.h>	/* Modules 			*/
24#include <linux/init.h>		/* Initdata			*/
25#include <linux/ioport.h>	/* request_region		*/
26#include <linux/videodev2.h>	/* kernel radio structs		*/
27#include <linux/mutex.h>
28#include <linux/io.h>		/* outb, outb_p			*/
29#include <linux/slab.h>
30#include <media/v4l2-device.h>
31#include <media/v4l2-ioctl.h>
32#include "radio-isa.h"
33
34MODULE_AUTHOR("R. Offermans & others");
35MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card.");
36MODULE_LICENSE("GPL");
37MODULE_VERSION("0.1.99");
38
39/* Note: there seems to be only one possible port (0x590), but without
40   hardware this is hard to verify. For now, this is the only one we will
41   support. */
42static int io = 0x590;
43static int radio_nr = -1;
44
45module_param(radio_nr, int, 0444);
46MODULE_PARM_DESC(radio_nr, "Radio device number");
47
48#define WRT_DIS 	0x00
49#define CLK_OFF		0x00
50#define IIC_DATA	0x01
51#define IIC_CLK		0x02
52#define DATA		0x04
53#define CLK_ON 		0x08
54#define WRT_EN		0x10
55
56static struct radio_isa_card *terratec_alloc(void)
57{
58	return kzalloc(sizeof(struct radio_isa_card), GFP_KERNEL);
59}
60
61static int terratec_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
62{
63	int i;
64
65	if (mute)
66		vol = 0;
67	vol = vol + (vol * 32); /* change both channels */
68	for (i = 0; i < 8; i++) {
69		if (vol & (0x80 >> i))
70			outb(0x80, isa->io + 1);
71		else
72			outb(0x00, isa->io + 1);
73	}
74	return 0;
75}
76
77
78/* this is the worst part in this driver */
79/* many more or less strange things are going on here, but hey, it works :) */
80
81static int terratec_s_frequency(struct radio_isa_card *isa, u32 freq)
82{
83	int i;
84	int p;
85	int temp;
86	long rest;
87	unsigned char buffer[25];		/* we have to bit shift 25 registers */
88
89	freq = freq / 160;			/* convert the freq. to a nice to handle value */
90	memset(buffer, 0, sizeof(buffer));
91
92	rest = freq * 10 + 10700;	/* I once had understood what is going on here */
93					/* maybe some wise guy (friedhelm?) can comment this stuff */
94	i = 13;
95	p = 10;
96	temp = 102400;
97	while (rest != 0) {
98		if (rest % temp  == rest)
99			buffer[i] = 0;
100		else {
101			buffer[i] = 1;
102			rest = rest - temp;
103		}
104		i--;
105		p--;
106		temp = temp / 2;
107	}
108
109	for (i = 24; i > -1; i--) {	/* bit shift the values to the radiocard */
110		if (buffer[i] == 1) {
111			outb(WRT_EN | DATA, isa->io);
112			outb(WRT_EN | DATA | CLK_ON, isa->io);
113			outb(WRT_EN | DATA, isa->io);
114		} else {
115			outb(WRT_EN | 0x00, isa->io);
116			outb(WRT_EN | 0x00 | CLK_ON, isa->io);
117		}
118	}
119	outb(0x00, isa->io);
120	return 0;
121}
122
123static u32 terratec_g_signal(struct radio_isa_card *isa)
124{
125	/* bit set = no signal present	*/
126	return (inb(isa->io) & 2) ? 0 : 0xffff;
127}
128
129static const struct radio_isa_ops terratec_ops = {
130	.alloc = terratec_alloc,
131	.s_mute_volume = terratec_s_mute_volume,
132	.s_frequency = terratec_s_frequency,
133	.g_signal = terratec_g_signal,
134};
135
136static const int terratec_ioports[] = { 0x590 };
137
138static struct radio_isa_driver terratec_driver = {
139	.driver = {
140		.match		= radio_isa_match,
141		.probe		= radio_isa_probe,
142		.remove		= radio_isa_remove,
143		.driver		= {
144			.name	= "radio-terratec",
145		},
146	},
147	.io_params = &io,
148	.radio_nr_params = &radio_nr,
149	.io_ports = terratec_ioports,
150	.num_of_io_ports = ARRAY_SIZE(terratec_ioports),
151	.region_size = 2,
152	.card = "TerraTec ActiveRadio",
153	.ops = &terratec_ops,
154	.has_stereo = true,
155	.max_volume = 10,
156};
157
158static int __init terratec_init(void)
159{
160	return isa_register_driver(&terratec_driver.driver, 1);
161}
162
163static void __exit terratec_exit(void)
164{
165	isa_unregister_driver(&terratec_driver.driver);
166}
167
168module_init(terratec_init);
169module_exit(terratec_exit);
170
171