2 * radio-aztech.c - Aztech radio card driver
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:
11 * Jason Lewis (jlewis@twilight.vtc.vsc.edu)
12 * Scott McGrath (smcgrath@twilight.vtc.vsc.edu)
13 * William McGrath (wmcgrath@twilight.vtc.vsc.edu)
15 * Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool.
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"
30 MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
31 MODULE_DESCRIPTION("A driver for the Aztech radio card.");
32 MODULE_LICENSE("GPL");
33 MODULE_VERSION("1.0.0");
35 /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
36 #ifndef CONFIG_RADIO_AZTECH_PORT
37 #define CONFIG_RADIO_AZTECH_PORT -1
42 static int io
[AZTECH_MAX
] = { [0] = CONFIG_RADIO_AZTECH_PORT
,
43 [1 ... (AZTECH_MAX
- 1)] = -1 };
44 static int radio_nr
[AZTECH_MAX
] = { [0 ... (AZTECH_MAX
- 1)] = -1 };
45 static const int radio_wait_time
= 1000;
47 module_param_array(io
, int, NULL
, 0444);
48 MODULE_PARM_DESC(io
, "I/O addresses of the Aztech card (0x350 or 0x358)");
49 module_param_array(radio_nr
, int, NULL
, 0444);
50 MODULE_PARM_DESC(radio_nr
, "Radio device numbers");
53 struct radio_isa_card isa
;
57 static void send_0_byte(struct aztech
*az
)
59 udelay(radio_wait_time
);
60 outb_p(2 + az
->curvol
, az
->isa
.io
);
61 outb_p(64 + 2 + az
->curvol
, az
->isa
.io
);
64 static void send_1_byte(struct aztech
*az
)
66 udelay(radio_wait_time
);
67 outb_p(128 + 2 + az
->curvol
, az
->isa
.io
);
68 outb_p(128 + 64 + 2 + az
->curvol
, az
->isa
.io
);
71 static struct radio_isa_card
*aztech_alloc(void)
73 struct aztech
*az
= kzalloc(sizeof(*az
), GFP_KERNEL
);
75 return az
? &az
->isa
: NULL
;
78 static int aztech_s_frequency(struct radio_isa_card
*isa
, u32 freq
)
80 struct aztech
*az
= container_of(isa
, struct aztech
, isa
);
83 freq
+= 171200; /* Add 10.7 MHz IF */
84 freq
/= 800; /* Convert to 50 kHz units */
86 send_0_byte(az
); /* 0: LSB of frequency */
88 for (i
= 0; i
< 13; i
++) /* : frequency bits (1-13) */
94 send_0_byte(az
); /* 14: test bit - always 0 */
95 send_0_byte(az
); /* 15: test bit - always 0 */
96 send_0_byte(az
); /* 16: band data 0 - always 0 */
97 if (isa
->stereo
) /* 17: stereo (1 to enable) */
102 send_1_byte(az
); /* 18: band data 1 - unknown */
103 send_0_byte(az
); /* 19: time base - always 0 */
104 send_0_byte(az
); /* 20: spacing (0 = 25 kHz) */
105 send_1_byte(az
); /* 21: spacing (1 = 25 kHz) */
106 send_0_byte(az
); /* 22: spacing (0 = 25 kHz) */
107 send_1_byte(az
); /* 23: AM/FM (FM = 1, always) */
109 /* latch frequency */
111 udelay(radio_wait_time
);
112 outb_p(128 + 64 + az
->curvol
, az
->isa
.io
);
117 /* thanks to Michael Dwyer for giving me a dose of clues in
118 * the signal strength department..
120 * This card has a stereo bit - bit 0 set = mono, not set = stereo
122 static u32
aztech_g_rxsubchans(struct radio_isa_card
*isa
)
124 if (inb(isa
->io
) & 1)
125 return V4L2_TUNER_SUB_MONO
;
126 return V4L2_TUNER_SUB_STEREO
;
129 static int aztech_s_stereo(struct radio_isa_card
*isa
, bool stereo
)
131 return aztech_s_frequency(isa
, isa
->freq
);
134 static int aztech_s_mute_volume(struct radio_isa_card
*isa
, bool mute
, int vol
)
136 struct aztech
*az
= container_of(isa
, struct aztech
, isa
);
140 az
->curvol
= (vol
& 1) + ((vol
& 2) << 1);
141 outb(az
->curvol
, isa
->io
);
145 static const struct radio_isa_ops aztech_ops
= {
146 .alloc
= aztech_alloc
,
147 .s_mute_volume
= aztech_s_mute_volume
,
148 .s_frequency
= aztech_s_frequency
,
149 .s_stereo
= aztech_s_stereo
,
150 .g_rxsubchans
= aztech_g_rxsubchans
,
153 static const int aztech_ioports
[] = { 0x350, 0x358 };
155 static struct radio_isa_driver aztech_driver
= {
157 .match
= radio_isa_match
,
158 .probe
= radio_isa_probe
,
159 .remove
= radio_isa_remove
,
161 .name
= "radio-aztech",
165 .radio_nr_params
= radio_nr
,
166 .io_ports
= aztech_ioports
,
167 .num_of_io_ports
= ARRAY_SIZE(aztech_ioports
),
169 .card
= "Aztech Radio",
175 static int __init
aztech_init(void)
177 return isa_register_driver(&aztech_driver
.driver
, AZTECH_MAX
);
180 static void __exit
aztech_exit(void)
182 isa_unregister_driver(&aztech_driver
.driver
);
185 module_init(aztech_init
);
186 module_exit(aztech_exit
);