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(bits, az->isa.io);
81 }
82 
83 static struct radio_isa_card *aztech_alloc(void)
84 {
85 	struct aztech *az = kzalloc(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, isa, aztech_set_pins);
93 
94 	return 0;
95 }
96 
97 static u32 aztech_g_rxsubchans(struct radio_isa_card *isa)
98 {
99 	if (inb(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(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(az->curvol, 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