Linux Kernel  3.7.1
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radio-aimslab.c
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1 /*
2  * AimsLab RadioTrack (aka RadioVeveal) driver
3  *
4  * Copyright 1997 M. Kirkwood
5  *
6  * Converted to the radio-isa framework by Hans Verkuil <[email protected]>
7  * Converted to V4L2 API by Mauro Carvalho Chehab <[email protected]>
8  * Converted to new API by Alan Cox <[email protected]>
9  * Various bugfixes and enhancements by Russell Kroll <[email protected]>
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 {
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 
86 {
87  struct radio_isa_card *isa = handle;
88  struct rtrack *rt = container_of(isa, struct rtrack, isa);
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);