[go: nahoru, domu]
1/*
2 * AimsLab RadioTrack (aka RadioVeveal) driver
3 *
4 * Copyright 1997 M. Kirkwood
5 *
6 * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>
7 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
8 * Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk>
9 * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
10 *
11 * Notes on the hardware (reverse engineered from other peoples'
12 * reverse engineering of AIMS' code :-)
13 *
14 *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
15 *
16 *  The signal strength query is unsurprisingly inaccurate.  And it seems
17 *  to indicate that (on my card, at least) the frequency setting isn't
18 *  too great.  (I have to tune up .025MHz from what the freq should be
19 *  to get a report that the thing is tuned.)
20 *
21 *  Volume control is (ugh) analogue:
22 *   out(port, start_increasing_volume);
23 *   wait(a_wee_while);
24 *   out(port, stop_changing_the_volume);
25 *
26 * Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool.
27 */
28
29#include <linux/module.h>	/* Modules 			*/
30#include <linux/init.h>		/* Initdata			*/
31#include <linux/ioport.h>	/* request_region		*/
32#include <linux/delay.h>	/* msleep			*/
33#include <linux/videodev2.h>	/* kernel radio structs		*/
34#include <linux/io.h>		/* outb, outb_p			*/
35#include <linux/slab.h>
36#include <media/v4l2-device.h>
37#include <media/v4l2-ioctl.h>
38#include <media/v4l2-ctrls.h>
39#include "radio-isa.h"
40#include "lm7000.h"
41
42MODULE_AUTHOR("M. Kirkwood");
43MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
44MODULE_LICENSE("GPL");
45MODULE_VERSION("1.0.0");
46
47#ifndef CONFIG_RADIO_RTRACK_PORT
48#define CONFIG_RADIO_RTRACK_PORT -1
49#endif
50
51#define RTRACK_MAX 2
52
53static int io[RTRACK_MAX] = { [0] = CONFIG_RADIO_RTRACK_PORT,
54			      [1 ... (RTRACK_MAX - 1)] = -1 };
55static int radio_nr[RTRACK_MAX]	= { [0 ... (RTRACK_MAX - 1)] = -1 };
56
57module_param_array(io, int, NULL, 0444);
58MODULE_PARM_DESC(io, "I/O addresses of the RadioTrack card (0x20f or 0x30f)");
59module_param_array(radio_nr, int, NULL, 0444);
60MODULE_PARM_DESC(radio_nr, "Radio device numbers");
61
62struct rtrack {
63	struct radio_isa_card isa;
64	int curvol;
65};
66
67static struct radio_isa_card *rtrack_alloc(void)
68{
69	struct rtrack *rt = kzalloc(sizeof(struct rtrack), GFP_KERNEL);
70
71	if (rt)
72		rt->curvol = 0xff;
73	return rt ? &rt->isa : NULL;
74}
75
76#define AIMS_BIT_TUN_CE		(1 << 0)
77#define AIMS_BIT_TUN_CLK	(1 << 1)
78#define AIMS_BIT_TUN_DATA	(1 << 2)
79#define AIMS_BIT_VOL_CE		(1 << 3)
80#define AIMS_BIT_TUN_STRQ	(1 << 4)
81/* bit 5 is not connected */
82#define AIMS_BIT_VOL_UP		(1 << 6)	/* active low */
83#define AIMS_BIT_VOL_DN		(1 << 7)	/* active low */
84
85static void rtrack_set_pins(void *handle, u8 pins)
86{
87	struct radio_isa_card *isa = handle;
88	struct rtrack *rt = container_of(isa, struct rtrack, isa);
89	u8 bits = AIMS_BIT_VOL_DN | AIMS_BIT_VOL_UP | AIMS_BIT_TUN_STRQ;
90
91	if (!v4l2_ctrl_g_ctrl(rt->isa.mute))
92		bits |= AIMS_BIT_VOL_CE;
93
94	if (pins & LM7000_DATA)
95		bits |= AIMS_BIT_TUN_DATA;
96	if (pins & LM7000_CLK)
97		bits |= AIMS_BIT_TUN_CLK;
98	if (pins & LM7000_CE)
99		bits |= AIMS_BIT_TUN_CE;
100
101	outb_p(bits, rt->isa.io);
102}
103
104static int rtrack_s_frequency(struct radio_isa_card *isa, u32 freq)
105{
106	lm7000_set_freq(freq, isa, rtrack_set_pins);
107
108	return 0;
109}
110
111static u32 rtrack_g_signal(struct radio_isa_card *isa)
112{
113	/* bit set = no signal present */
114	return 0xffff * !(inb(isa->io) & 2);
115}
116
117static int rtrack_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
118{
119	struct rtrack *rt = container_of(isa, struct rtrack, isa);
120	int curvol = rt->curvol;
121
122	if (mute) {
123		outb(0xd0, isa->io);	/* volume steady + sigstr + off	*/
124		return 0;
125	}
126	if (vol == 0) {			/* volume = 0 means mute the card */
127		outb(0x48, isa->io);	/* volume down but still "on"	*/
128		msleep(curvol * 3);	/* make sure it's totally down	*/
129	} else if (curvol < vol) {
130		outb(0x98, isa->io);	/* volume up + sigstr + on	*/
131		for (; curvol < vol; curvol++)
132			udelay(3000);
133	} else if (curvol > vol) {
134		outb(0x58, isa->io);	/* volume down + sigstr + on	*/
135		for (; curvol > vol; curvol--)
136			udelay(3000);
137	}
138	outb(0xd8, isa->io);		/* volume steady + sigstr + on	*/
139	rt->curvol = vol;
140	return 0;
141}
142
143/* Mute card - prevents noisy bootups */
144static int rtrack_initialize(struct radio_isa_card *isa)
145{
146	/* this ensures that the volume is all the way up  */
147	outb(0x90, isa->io);	/* volume up but still "on"	*/
148	msleep(3000);		/* make sure it's totally up	*/
149	outb(0xc0, isa->io);	/* steady volume, mute card	*/
150	return 0;
151}
152
153static const struct radio_isa_ops rtrack_ops = {
154	.alloc = rtrack_alloc,
155	.init = rtrack_initialize,
156	.s_mute_volume = rtrack_s_mute_volume,
157	.s_frequency = rtrack_s_frequency,
158	.g_signal = rtrack_g_signal,
159};
160
161static const int rtrack_ioports[] = { 0x20f, 0x30f };
162
163static struct radio_isa_driver rtrack_driver = {
164	.driver = {
165		.match		= radio_isa_match,
166		.probe		= radio_isa_probe,
167		.remove		= radio_isa_remove,
168		.driver		= {
169			.name	= "radio-aimslab",
170		},
171	},
172	.io_params = io,
173	.radio_nr_params = radio_nr,
174	.io_ports = rtrack_ioports,
175	.num_of_io_ports = ARRAY_SIZE(rtrack_ioports),
176	.region_size = 2,
177	.card = "AIMSlab RadioTrack/RadioReveal",
178	.ops = &rtrack_ops,
179	.has_stereo = true,
180	.max_volume = 0xff,
181};
182
183static int __init rtrack_init(void)
184{
185	return isa_register_driver(&rtrack_driver.driver, RTRACK_MAX);
186}
187
188static void __exit rtrack_exit(void)
189{
190	isa_unregister_driver(&rtrack_driver.driver);
191}
192
193module_init(rtrack_init);
194module_exit(rtrack_exit);
195