1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * radio-aztech.c - Aztech radio card driver |
4 | * |
5 | * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@xs4all.nl> |
6 | * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@kernel.org> |
7 | * Adapted to support the Video for Linux API by |
8 | * Russell Kroll <rkroll@exploits.org>. Based on original tuner code by: |
9 | * |
10 | * Quay Ly |
11 | * Donald Song |
12 | * Jason Lewis (jlewis@twilight.vtc.vsc.edu) |
13 | * Scott McGrath (smcgrath@twilight.vtc.vsc.edu) |
14 | * William McGrath (wmcgrath@twilight.vtc.vsc.edu) |
15 | * |
16 | * Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool. |
17 | */ |
18 | |
19 | #include <linux/module.h> /* Modules */ |
20 | #include <linux/init.h> /* Initdata */ |
21 | #include <linux/ioport.h> /* request_region */ |
22 | #include <linux/delay.h> /* udelay */ |
23 | #include <linux/videodev2.h> /* kernel radio structs */ |
24 | #include <linux/io.h> /* outb, outb_p */ |
25 | #include <linux/slab.h> |
26 | #include <media/v4l2-device.h> |
27 | #include <media/v4l2-ioctl.h> |
28 | #include <media/v4l2-ctrls.h> |
29 | #include "radio-isa.h" |
30 | #include "lm7000.h" |
31 | |
32 | MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath" ); |
33 | MODULE_DESCRIPTION("A driver for the Aztech radio card." ); |
34 | MODULE_LICENSE("GPL" ); |
35 | MODULE_VERSION("1.0.0" ); |
36 | |
37 | /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */ |
38 | #ifndef CONFIG_RADIO_AZTECH_PORT |
39 | #define CONFIG_RADIO_AZTECH_PORT -1 |
40 | #endif |
41 | |
42 | #define AZTECH_MAX 2 |
43 | |
44 | static int io[AZTECH_MAX] = { [0] = CONFIG_RADIO_AZTECH_PORT, |
45 | [1 ... (AZTECH_MAX - 1)] = -1 }; |
46 | static int radio_nr[AZTECH_MAX] = { [0 ... (AZTECH_MAX - 1)] = -1 }; |
47 | |
48 | module_param_array(io, int, NULL, 0444); |
49 | MODULE_PARM_DESC(io, "I/O addresses of the Aztech card (0x350 or 0x358)" ); |
50 | module_param_array(radio_nr, int, NULL, 0444); |
51 | MODULE_PARM_DESC(radio_nr, "Radio device numbers" ); |
52 | |
53 | struct aztech { |
54 | struct radio_isa_card isa; |
55 | int curvol; |
56 | }; |
57 | |
58 | /* bit definitions for register read */ |
59 | #define AZTECH_BIT_NOT_TUNED (1 << 0) |
60 | #define AZTECH_BIT_MONO (1 << 1) |
61 | /* bit definitions for register write */ |
62 | #define AZTECH_BIT_TUN_CE (1 << 1) |
63 | #define AZTECH_BIT_TUN_CLK (1 << 6) |
64 | #define AZTECH_BIT_TUN_DATA (1 << 7) |
65 | /* bits 0 and 2 are volume control, bits 3..5 are not connected */ |
66 | |
67 | static void aztech_set_pins(void *handle, u8 pins) |
68 | { |
69 | struct radio_isa_card *isa = handle; |
70 | struct aztech *az = container_of(isa, struct aztech, isa); |
71 | u8 bits = az->curvol; |
72 | |
73 | if (pins & LM7000_DATA) |
74 | bits |= AZTECH_BIT_TUN_DATA; |
75 | if (pins & LM7000_CLK) |
76 | bits |= AZTECH_BIT_TUN_CLK; |
77 | if (pins & LM7000_CE) |
78 | bits |= AZTECH_BIT_TUN_CE; |
79 | |
80 | outb_p(value: bits, port: az->isa.io); |
81 | } |
82 | |
83 | static struct radio_isa_card *aztech_alloc(void) |
84 | { |
85 | struct aztech *az = kzalloc(size: sizeof(*az), GFP_KERNEL); |
86 | |
87 | return az ? &az->isa : NULL; |
88 | } |
89 | |
90 | static int aztech_s_frequency(struct radio_isa_card *isa, u32 freq) |
91 | { |
92 | lm7000_set_freq(freq, handle: isa, set_pins: aztech_set_pins); |
93 | |
94 | return 0; |
95 | } |
96 | |
97 | static u32 aztech_g_rxsubchans(struct radio_isa_card *isa) |
98 | { |
99 | if (inb(port: isa->io) & AZTECH_BIT_MONO) |
100 | return V4L2_TUNER_SUB_MONO; |
101 | return V4L2_TUNER_SUB_STEREO; |
102 | } |
103 | |
104 | static u32 aztech_g_signal(struct radio_isa_card *isa) |
105 | { |
106 | return (inb(port: isa->io) & AZTECH_BIT_NOT_TUNED) ? 0 : 0xffff; |
107 | } |
108 | |
109 | static int aztech_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol) |
110 | { |
111 | struct aztech *az = container_of(isa, struct aztech, isa); |
112 | |
113 | if (mute) |
114 | vol = 0; |
115 | az->curvol = (vol & 1) + ((vol & 2) << 1); |
116 | outb(value: az->curvol, port: isa->io); |
117 | return 0; |
118 | } |
119 | |
120 | static const struct radio_isa_ops aztech_ops = { |
121 | .alloc = aztech_alloc, |
122 | .s_mute_volume = aztech_s_mute_volume, |
123 | .s_frequency = aztech_s_frequency, |
124 | .g_rxsubchans = aztech_g_rxsubchans, |
125 | .g_signal = aztech_g_signal, |
126 | }; |
127 | |
128 | static const int aztech_ioports[] = { 0x350, 0x358 }; |
129 | |
130 | static struct radio_isa_driver aztech_driver = { |
131 | .driver = { |
132 | .match = radio_isa_match, |
133 | .probe = radio_isa_probe, |
134 | .remove = radio_isa_remove, |
135 | .driver = { |
136 | .name = "radio-aztech" , |
137 | }, |
138 | }, |
139 | .io_params = io, |
140 | .radio_nr_params = radio_nr, |
141 | .io_ports = aztech_ioports, |
142 | .num_of_io_ports = ARRAY_SIZE(aztech_ioports), |
143 | .region_size = 8, |
144 | .card = "Aztech Radio" , |
145 | .ops = &aztech_ops, |
146 | .has_stereo = true, |
147 | .max_volume = 3, |
148 | }; |
149 | |
150 | static int __init aztech_init(void) |
151 | { |
152 | return isa_register_driver(&aztech_driver.driver, AZTECH_MAX); |
153 | } |
154 | |
155 | static void __exit aztech_exit(void) |
156 | { |
157 | isa_unregister_driver(&aztech_driver.driver); |
158 | } |
159 | |
160 | module_init(aztech_init); |
161 | module_exit(aztech_exit); |
162 | |