tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * radio-aztech.c - Aztech radio card driver
3 *
4 * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@xs4all.nl>
5 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
6 * Adapted to support the Video for Linux API by
7 * Russell Kroll <rkroll@exploits.org>. Based on original tuner code by:
8 *
9 * Quay Ly
10 * Donald Song
11 * Jason Lewis (jlewis@twilight.vtc.vsc.edu)
12 * Scott McGrath (smcgrath@twilight.vtc.vsc.edu)
13 * William McGrath (wmcgrath@twilight.vtc.vsc.edu)
14 *
15 * Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool.
16*/
17
18#include <linux/module.h> /* Modules */
19#include <linux/init.h> /* Initdata */
20#include <linux/ioport.h> /* request_region */
21#include <linux/delay.h> /* udelay */
22#include <linux/videodev2.h> /* kernel radio structs */
23#include <linux/io.h> /* outb, outb_p */
24#include <linux/slab.h>
25#include <media/v4l2-device.h>
26#include <media/v4l2-ioctl.h>
27#include <media/v4l2-ctrls.h>
28#include "radio-isa.h"
29#include "lm7000.h"
30
31MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
32MODULE_DESCRIPTION("A driver for the Aztech radio card.");
33MODULE_LICENSE("GPL");
34MODULE_VERSION("1.0.0");
35
36/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
37#ifndef CONFIG_RADIO_AZTECH_PORT
38#define CONFIG_RADIO_AZTECH_PORT -1
39#endif
40
41#define AZTECH_MAX 2
42
43static int io[AZTECH_MAX] = { [0] = CONFIG_RADIO_AZTECH_PORT,
44 [1 ... (AZTECH_MAX - 1)] = -1 };
45static int radio_nr[AZTECH_MAX] = { [0 ... (AZTECH_MAX - 1)] = -1 };
46
47module_param_array(io, int, NULL, 0444);
48MODULE_PARM_DESC(io, "I/O addresses of the Aztech card (0x350 or 0x358)");
49module_param_array(radio_nr, int, NULL, 0444);
50MODULE_PARM_DESC(radio_nr, "Radio device numbers");
51
52struct aztech {
53 struct radio_isa_card isa;
54 int curvol;
55};
56
57/* bit definitions for register read */
58#define AZTECH_BIT_NOT_TUNED (1 << 0)
59#define AZTECH_BIT_MONO (1 << 1)
60/* bit definitions for register write */
61#define AZTECH_BIT_TUN_CE (1 << 1)
62#define AZTECH_BIT_TUN_CLK (1 << 6)
63#define AZTECH_BIT_TUN_DATA (1 << 7)
64/* bits 0 and 2 are volume control, bits 3..5 are not connected */
65
66static void aztech_set_pins(void *handle, u8 pins)
67{
68 struct radio_isa_card *isa = handle;
69 struct aztech *az = container_of(isa, struct aztech, isa);
70 u8 bits = az->curvol;
71
72 if (pins & LM7000_DATA)
73 bits |= AZTECH_BIT_TUN_DATA;
74 if (pins & LM7000_CLK)
75 bits |= AZTECH_BIT_TUN_CLK;
76 if (pins & LM7000_CE)
77 bits |= AZTECH_BIT_TUN_CE;
78
79 outb_p(bits, az->isa.io);
80}
81
82static struct radio_isa_card *aztech_alloc(void)
83{
84 struct aztech *az = kzalloc(sizeof(*az), GFP_KERNEL);
85
86 return az ? &az->isa : NULL;
87}
88
89static int aztech_s_frequency(struct radio_isa_card *isa, u32 freq)
90{
91 lm7000_set_freq(freq, isa, aztech_set_pins);
92
93 return 0;
94}
95
96static u32 aztech_g_rxsubchans(struct radio_isa_card *isa)
97{
98 if (inb(isa->io) & AZTECH_BIT_MONO)
99 return V4L2_TUNER_SUB_MONO;
100 return V4L2_TUNER_SUB_STEREO;
101}
102
103static u32 aztech_g_signal(struct radio_isa_card *isa)
104{
105 return (inb(isa->io) & AZTECH_BIT_NOT_TUNED) ? 0 : 0xffff;
106}
107
108static int aztech_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
109{
110 struct aztech *az = container_of(isa, struct aztech, isa);
111
112 if (mute)
113 vol = 0;
114 az->curvol = (vol & 1) + ((vol & 2) << 1);
115 outb(az->curvol, isa->io);
116 return 0;
117}
118
119static const struct radio_isa_ops aztech_ops = {
120 .alloc = aztech_alloc,
121 .s_mute_volume = aztech_s_mute_volume,
122 .s_frequency = aztech_s_frequency,
123 .g_rxsubchans = aztech_g_rxsubchans,
124 .g_signal = aztech_g_signal,
125};
126
127static const int aztech_ioports[] = { 0x350, 0x358 };
128
129static struct radio_isa_driver aztech_driver = {
130 .driver = {
131 .match = radio_isa_match,
132 .probe = radio_isa_probe,
133 .remove = radio_isa_remove,
134 .driver = {
135 .name = "radio-aztech",
136 },
137 },
138 .io_params = io,
139 .radio_nr_params = radio_nr,
140 .io_ports = aztech_ioports,
141 .num_of_io_ports = ARRAY_SIZE(aztech_ioports),
142 .region_size = 8,
143 .card = "Aztech Radio",
144 .ops = &aztech_ops,
145 .has_stereo = true,
146 .max_volume = 3,
147};
148
149static int __init aztech_init(void)
150{
151 return isa_register_driver(&aztech_driver.driver, AZTECH_MAX);
152}
153
154static void __exit aztech_exit(void)
155{
156 isa_unregister_driver(&aztech_driver.driver);
157}
158
159module_init(aztech_init);
160module_exit(aztech_exit);