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@kernel.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
rtrack_alloc(void)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
rtrack_set_pins(void * handle,u8 pins)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
rtrack_s_frequency(struct radio_isa_card * isa,u32 freq)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
rtrack_g_signal(struct radio_isa_card * isa)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
rtrack_s_mute_volume(struct radio_isa_card * isa,bool mute,int vol)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 mdelay(3);
133 } else if (curvol > vol) {
134 outb(0x58, isa->io); /* volume down + sigstr + on */
135 for (; curvol > vol; curvol--)
136 mdelay(3);
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 */
rtrack_initialize(struct radio_isa_card * isa)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
rtrack_init(void)183 static int __init rtrack_init(void)
184 {
185 return isa_register_driver(&rtrack_driver.driver, RTRACK_MAX);
186 }
187
rtrack_exit(void)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
