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
trust_alloc(void)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
write_i2c(struct trust * tr,int n,...)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
trust_s_mute_volume(struct radio_isa_card * isa,bool mute,int vol)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
trust_s_stereo(struct radio_isa_card * isa,bool stereo)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
trust_g_signal(struct radio_isa_card * isa)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
trust_s_frequency(struct radio_isa_card * isa,u32 freq)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
trust_s_ctrl(struct v4l2_ctrl * ctrl)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
trust_initialize(struct radio_isa_card * isa)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
trust_init(void)232 static int __init trust_init(void)
233 {
234 return isa_register_driver(&trust_driver.driver, TRUST_MAX);
235 }
236
trust_exit(void)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