1 // SPDX-License-Identifier: GPL-2.0-only
2 /* radio-trust.c - Trust FM Radio card driver for Linux 2.2
3  * by Eric Lammerts <eric@scintilla.utwente.nl>
4  *
5  * Based on radio-aztech.c. Original notes:
6  *
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  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@kernel.org>
17  */
18 
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/ioport.h>
22 #include <linux/videodev2.h>
23 #include <linux/io.h>
24 #include <linux/slab.h>
25 #include <media/v4l2-device.h>
26 #include <media/v4l2-ioctl.h>
27 #include "radio-isa.h"
28 
29 MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
30 MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
31 MODULE_LICENSE("GPL");
32 MODULE_VERSION("0.1.99");
33 
34 /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
35 
36 #ifndef CONFIG_RADIO_TRUST_PORT
37 #define CONFIG_RADIO_TRUST_PORT -1
38 #endif
39 
40 #define TRUST_MAX 2
41 
42 static int io[TRUST_MAX] = { [0] = CONFIG_RADIO_TRUST_PORT,
43 			      [1 ... (TRUST_MAX - 1)] = -1 };
44 static int radio_nr[TRUST_MAX] = { [0 ... (TRUST_MAX - 1)] = -1 };
45 
46 module_param_array(io, int, NULL, 0444);
47 MODULE_PARM_DESC(io, "I/O addresses of the Trust FM Radio card (0x350 or 0x358)");
48 module_param_array(radio_nr, int, NULL, 0444);
49 MODULE_PARM_DESC(radio_nr, "Radio device numbers");
50 
51 struct trust {
52 	struct radio_isa_card isa;
53 	int ioval;
54 };
55 
56 static struct radio_isa_card *trust_alloc(void)
57 {
58 	struct trust *tr = kzalloc(sizeof(*tr), GFP_KERNEL);
59 
60 	return tr ? &tr->isa : NULL;
61 }
62 
63 /* i2c addresses */
64 #define TDA7318_ADDR 0x88
65 #define TSA6060T_ADDR 0xc4
66 
67 #define TR_DELAY do { inb(tr->isa.io); inb(tr->isa.io); inb(tr->isa.io); } while (0)
68 #define TR_SET_SCL outb(tr->ioval |= 2, tr->isa.io)
69 #define TR_CLR_SCL outb(tr->ioval &= 0xfd, tr->isa.io)
70 #define TR_SET_SDA outb(tr->ioval |= 1, tr->isa.io)
71 #define TR_CLR_SDA outb(tr->ioval &= 0xfe, tr->isa.io)
72 
73 static void write_i2c(struct trust *tr, int n, ...)
74 {
75 	unsigned char val, mask;
76 	va_list args;
77 
78 	va_start(args, n);
79 
80 	/* start condition */
81 	TR_SET_SDA;
82 	TR_SET_SCL;
83 	TR_DELAY;
84 	TR_CLR_SDA;
85 	TR_CLR_SCL;
86 	TR_DELAY;
87 
88 	for (; n; n--) {
89 		val = va_arg(args, unsigned);
90 		for (mask = 0x80; mask; mask >>= 1) {
91 			if (val & mask)
92 				TR_SET_SDA;
93 			else
94 				TR_CLR_SDA;
95 			TR_SET_SCL;
96 			TR_DELAY;
97 			TR_CLR_SCL;
98 			TR_DELAY;
99 		}
100 		/* acknowledge bit */
101 		TR_SET_SDA;
102 		TR_SET_SCL;
103 		TR_DELAY;
104 		TR_CLR_SCL;
105 		TR_DELAY;
106 	}
107 
108 	/* stop condition */
109 	TR_CLR_SDA;
110 	TR_DELAY;
111 	TR_SET_SCL;
112 	TR_DELAY;
113 	TR_SET_SDA;
114 	TR_DELAY;
115 
116 	va_end(args);
117 }
118 
119 static int trust_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
120 {
121 	struct trust *tr = container_of(isa, struct trust, isa);
122 
123 	tr->ioval = (tr->ioval & 0xf7) | (mute << 3);
124 	outb(tr->ioval, isa->io);
125 	write_i2c(tr, 2, TDA7318_ADDR, vol ^ 0x1f);
126 	return 0;
127 }
128 
129 static int trust_s_stereo(struct radio_isa_card *isa, bool stereo)
130 {
131 	struct trust *tr = container_of(isa, struct trust, isa);
132 
133 	tr->ioval = (tr->ioval & 0xfb) | (!stereo << 2);
134 	outb(tr->ioval, isa->io);
135 	return 0;
136 }
137 
138 static u32 trust_g_signal(struct radio_isa_card *isa)
139 {
140 	int i, v;
141 
142 	for (i = 0, v = 0; i < 100; i++)
143 		v |= inb(isa->io);
144 	return (v & 1) ? 0 : 0xffff;
145 }
146 
147 static int trust_s_frequency(struct radio_isa_card *isa, u32 freq)
148 {
149 	struct trust *tr = container_of(isa, struct trust, isa);
150 
151 	freq /= 160;	/* Convert to 10 kHz units	*/
152 	freq += 1070;	/* Add 10.7 MHz IF		*/
153 	write_i2c(tr, 5, TSA6060T_ADDR, (freq << 1) | 1,
154 			freq >> 7, 0x60 | ((freq >> 15) & 1), 0);
155 	return 0;
156 }
157 
158 static int basstreble2chip[15] = {
159 	0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
160 };
161 
162 static int trust_s_ctrl(struct v4l2_ctrl *ctrl)
163 {
164 	struct radio_isa_card *isa =
165 		container_of(ctrl->handler, struct radio_isa_card, hdl);
166 	struct trust *tr = container_of(isa, struct trust, isa);
167 
168 	switch (ctrl->id) {
169 	case V4L2_CID_AUDIO_BASS:
170 		write_i2c(tr, 2, TDA7318_ADDR, 0x60 | basstreble2chip[ctrl->val]);
171 		return 0;
172 	case V4L2_CID_AUDIO_TREBLE:
173 		write_i2c(tr, 2, TDA7318_ADDR, 0x70 | basstreble2chip[ctrl->val]);
174 		return 0;
175 	}
176 	return -EINVAL;
177 }
178 
179 static const struct v4l2_ctrl_ops trust_ctrl_ops = {
180 	.s_ctrl = trust_s_ctrl,
181 };
182 
183 static int trust_initialize(struct radio_isa_card *isa)
184 {
185 	struct trust *tr = container_of(isa, struct trust, isa);
186 
187 	tr->ioval = 0xf;
188 	write_i2c(tr, 2, TDA7318_ADDR, 0x80);	/* speaker att. LF = 0 dB */
189 	write_i2c(tr, 2, TDA7318_ADDR, 0xa0);	/* speaker att. RF = 0 dB */
190 	write_i2c(tr, 2, TDA7318_ADDR, 0xc0);	/* speaker att. LR = 0 dB */
191 	write_i2c(tr, 2, TDA7318_ADDR, 0xe0);	/* speaker att. RR = 0 dB */
192 	write_i2c(tr, 2, TDA7318_ADDR, 0x40);	/* stereo 1 input, gain = 18.75 dB */
193 
194 	v4l2_ctrl_new_std(&isa->hdl, &trust_ctrl_ops,
195 				V4L2_CID_AUDIO_BASS, 0, 15, 1, 8);
196 	v4l2_ctrl_new_std(&isa->hdl, &trust_ctrl_ops,
197 				V4L2_CID_AUDIO_TREBLE, 0, 15, 1, 8);
198 	return isa->hdl.error;
199 }
200 
201 static const struct radio_isa_ops trust_ops = {
202 	.init = trust_initialize,
203 	.alloc = trust_alloc,
204 	.s_mute_volume = trust_s_mute_volume,
205 	.s_frequency = trust_s_frequency,
206 	.s_stereo = trust_s_stereo,
207 	.g_signal = trust_g_signal,
208 };
209 
210 static const int trust_ioports[] = { 0x350, 0x358 };
211 
212 static struct radio_isa_driver trust_driver = {
213 	.driver = {
214 		.match		= radio_isa_match,
215 		.probe		= radio_isa_probe,
216 		.remove		= radio_isa_remove,
217 		.driver		= {
218 			.name	= "radio-trust",
219 		},
220 	},
221 	.io_params = io,
222 	.radio_nr_params = radio_nr,
223 	.io_ports = trust_ioports,
224 	.num_of_io_ports = ARRAY_SIZE(trust_ioports),
225 	.region_size = 2,
226 	.card = "Trust FM Radio",
227 	.ops = &trust_ops,
228 	.has_stereo = true,
229 	.max_volume = 31,
230 };
231 
232 static int __init trust_init(void)
233 {
234 	return isa_register_driver(&trust_driver.driver, TRUST_MAX);
235 }
236 
237 static void __exit trust_exit(void)
238 {
239 	isa_unregister_driver(&trust_driver.driver);
240 }
241 
242 module_init(trust_init);
243 module_exit(trust_exit);
244