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 
42 MODULE_AUTHOR("M. Kirkwood");
43 MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
44 MODULE_LICENSE("GPL");
45 MODULE_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 
53 static int io[RTRACK_MAX] = { [0] = CONFIG_RADIO_RTRACK_PORT,
54 			      [1 ... (RTRACK_MAX - 1)] = -1 };
55 static int radio_nr[RTRACK_MAX]	= { [0 ... (RTRACK_MAX - 1)] = -1 };
56 
57 module_param_array(io, int, NULL, 0444);
58 MODULE_PARM_DESC(io, "I/O addresses of the RadioTrack card (0x20f or 0x30f)");
59 module_param_array(radio_nr, int, NULL, 0444);
60 MODULE_PARM_DESC(radio_nr, "Radio device numbers");
61 
62 struct rtrack {
63 	struct radio_isa_card isa;
64 	int curvol;
65 };
66 
67 static 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 
85 static 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 
104 static 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 
111 static 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 
117 static 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 */
144 static 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 
153 static 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 
161 static const int rtrack_ioports[] = { 0x20f, 0x30f };
162 
163 static 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 
183 static int __init rtrack_init(void)
184 {
185 	return isa_register_driver(&rtrack_driver.driver, RTRACK_MAX);
186 }
187 
188 static void __exit rtrack_exit(void)
189 {
190 	isa_unregister_driver(&rtrack_driver.driver);
191 }
192 
193 module_init(rtrack_init);
194 module_exit(rtrack_exit);
195