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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
6b39246c HV |
2 | /* |
3 | * Zoltrix Radio Plus driver | |
4 | * Copyright 1998 C. van Schaik <carl@leg.uct.ac.za> | |
1da177e4 | 5 | * |
4286c6f6 | 6 | * BUGS |
1da177e4 LT |
7 | * Due to the inconsistency in reading from the signal flags |
8 | * it is difficult to get an accurate tuned signal. | |
9 | * | |
10 | * It seems that the card is not linear to 0 volume. It cuts off | |
11 | * at a low volume, and it is not possible (at least I have not found) | |
12 | * to get fine volume control over the low volume range. | |
13 | * | |
14 | * Some code derived from code by Romolo Manfredini | |
15 | * romolo@bicnet.it | |
16 | * | |
17 | * 1999-05-06 - (C. van Schaik) | |
18 | * - Make signal strength and stereo scans | |
4286c6f6 | 19 | * kinder to cpu while in delay |
1da177e4 LT |
20 | * 1999-01-05 - (C. van Schaik) |
21 | * - Changed tuning to 1/160Mhz accuracy | |
22 | * - Added stereo support | |
23 | * (card defaults to stereo) | |
24 | * (can explicitly force mono on the card) | |
25 | * (can detect if station is in stereo) | |
26 | * - Added unmute function | |
27 | * - Reworked ioctl functions | |
28 | * 2002-07-15 - Fix Stereo typo | |
2ab65299 MCC |
29 | * |
30 | * 2006-07-24 - Converted to V4L2 API | |
32590819 | 31 | * by Mauro Carvalho Chehab <mchehab@kernel.org> |
6b39246c HV |
32 | * |
33 | * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com> | |
34 | * | |
35 | * Note that this is the driver for the Zoltrix Radio Plus. | |
36 | * This driver does not work for the Zoltrix Radio Plus 108 or the | |
37 | * Zoltrix Radio Plus for Windows. | |
38 | * | |
39 | * Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool. | |
1da177e4 LT |
40 | */ |
41 | ||
42 | #include <linux/module.h> /* Modules */ | |
43 | #include <linux/init.h> /* Initdata */ | |
fb911ee8 | 44 | #include <linux/ioport.h> /* request_region */ |
1da177e4 | 45 | #include <linux/delay.h> /* udelay, msleep */ |
2ab65299 | 46 | #include <linux/videodev2.h> /* kernel radio structs */ |
ec632c8a | 47 | #include <linux/mutex.h> |
ec632c8a | 48 | #include <linux/io.h> /* outb, outb_p */ |
9f1dfccf | 49 | #include <linux/slab.h> |
ec632c8a | 50 | #include <media/v4l2-device.h> |
35ea11ff | 51 | #include <media/v4l2-ioctl.h> |
6b39246c | 52 | #include "radio-isa.h" |
1da177e4 | 53 | |
6b39246c | 54 | MODULE_AUTHOR("C. van Schaik"); |
ec632c8a HV |
55 | MODULE_DESCRIPTION("A driver for the Zoltrix Radio Plus."); |
56 | MODULE_LICENSE("GPL"); | |
6b39246c | 57 | MODULE_VERSION("0.1.99"); |
2ab65299 | 58 | |
1da177e4 LT |
59 | #ifndef CONFIG_RADIO_ZOLTRIX_PORT |
60 | #define CONFIG_RADIO_ZOLTRIX_PORT -1 | |
61 | #endif | |
62 | ||
6b39246c HV |
63 | #define ZOLTRIX_MAX 2 |
64 | ||
65 | static int io[ZOLTRIX_MAX] = { [0] = CONFIG_RADIO_ZOLTRIX_PORT, | |
66 | [1 ... (ZOLTRIX_MAX - 1)] = -1 }; | |
67 | static int radio_nr[ZOLTRIX_MAX] = { [0 ... (ZOLTRIX_MAX - 1)] = -1 }; | |
1da177e4 | 68 | |
6b39246c HV |
69 | module_param_array(io, int, NULL, 0444); |
70 | MODULE_PARM_DESC(io, "I/O addresses of the Zoltrix Radio Plus card (0x20c or 0x30c)"); | |
71 | module_param_array(radio_nr, int, NULL, 0444); | |
72 | MODULE_PARM_DESC(radio_nr, "Radio device numbers"); | |
ec632c8a | 73 | |
ec632c8a | 74 | struct zoltrix { |
6b39246c | 75 | struct radio_isa_card isa; |
1da177e4 | 76 | int curvol; |
6b39246c | 77 | bool muted; |
1da177e4 LT |
78 | }; |
79 | ||
6b39246c HV |
80 | static struct radio_isa_card *zoltrix_alloc(void) |
81 | { | |
82 | struct zoltrix *zol = kzalloc(sizeof(*zol), GFP_KERNEL); | |
83 | ||
84 | return zol ? &zol->isa : NULL; | |
85 | } | |
ec632c8a | 86 | |
6b39246c | 87 | static int zoltrix_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol) |
1da177e4 | 88 | { |
6b39246c | 89 | struct zoltrix *zol = container_of(isa, struct zoltrix, isa); |
1da177e4 | 90 | |
6b39246c HV |
91 | zol->curvol = vol; |
92 | zol->muted = mute; | |
93 | if (mute || vol == 0) { | |
94 | outb(0, isa->io); | |
95 | outb(0, isa->io); | |
96 | inb(isa->io + 3); /* Zoltrix needs to be read to confirm */ | |
1da177e4 LT |
97 | return 0; |
98 | } | |
99 | ||
6b39246c | 100 | outb(vol - 1, isa->io); |
1da177e4 | 101 | msleep(10); |
6b39246c | 102 | inb(isa->io + 2); |
1da177e4 LT |
103 | return 0; |
104 | } | |
105 | ||
6b39246c HV |
106 | /* tunes the radio to the desired frequency */ |
107 | static int zoltrix_s_frequency(struct radio_isa_card *isa, u32 freq) | |
1da177e4 | 108 | { |
6b39246c HV |
109 | struct zoltrix *zol = container_of(isa, struct zoltrix, isa); |
110 | struct v4l2_device *v4l2_dev = &isa->v4l2_dev; | |
1da177e4 | 111 | unsigned long long bitmask, f, m; |
6b39246c | 112 | bool stereo = isa->stereo; |
1da177e4 LT |
113 | int i; |
114 | ||
b4be2048 | 115 | if (freq == 0) { |
ec632c8a | 116 | v4l2_warn(v4l2_dev, "cannot set a frequency of 0.\n"); |
b4be2048 AK |
117 | return -EINVAL; |
118 | } | |
119 | ||
1da177e4 | 120 | m = (freq / 160 - 8800) * 2; |
ec632c8a | 121 | f = (unsigned long long)m + 0x4d1c; |
1da177e4 LT |
122 | |
123 | bitmask = 0xc480402c10080000ull; | |
124 | i = 45; | |
125 | ||
6b39246c HV |
126 | outb(0, isa->io); |
127 | outb(0, isa->io); | |
128 | inb(isa->io + 3); /* Zoltrix needs to be read to confirm */ | |
1da177e4 | 129 | |
6b39246c HV |
130 | outb(0x40, isa->io); |
131 | outb(0xc0, isa->io); | |
ec632c8a HV |
132 | |
133 | bitmask = (bitmask ^ ((f & 0xff) << 47) ^ ((f & 0xff00) << 30) ^ (stereo << 31)); | |
1da177e4 LT |
134 | while (i--) { |
135 | if ((bitmask & 0x8000000000000000ull) != 0) { | |
6b39246c | 136 | outb(0x80, isa->io); |
1da177e4 | 137 | udelay(50); |
6b39246c | 138 | outb(0x00, isa->io); |
1da177e4 | 139 | udelay(50); |
6b39246c | 140 | outb(0x80, isa->io); |
1da177e4 LT |
141 | udelay(50); |
142 | } else { | |
6b39246c | 143 | outb(0xc0, isa->io); |
1da177e4 | 144 | udelay(50); |
6b39246c | 145 | outb(0x40, isa->io); |
1da177e4 | 146 | udelay(50); |
6b39246c | 147 | outb(0xc0, isa->io); |
1da177e4 LT |
148 | udelay(50); |
149 | } | |
150 | bitmask *= 2; | |
151 | } | |
152 | /* termination sequence */ | |
6b39246c HV |
153 | outb(0x80, isa->io); |
154 | outb(0xc0, isa->io); | |
155 | outb(0x40, isa->io); | |
1da177e4 | 156 | udelay(1000); |
6b39246c | 157 | inb(isa->io + 2); |
4286c6f6 MCC |
158 | udelay(1000); |
159 | ||
6b39246c | 160 | return zoltrix_s_mute_volume(isa, zol->muted, zol->curvol); |
1da177e4 LT |
161 | } |
162 | ||
163 | /* Get signal strength */ | |
6b39246c | 164 | static u32 zoltrix_g_rxsubchans(struct radio_isa_card *isa) |
1da177e4 | 165 | { |
6b39246c | 166 | struct zoltrix *zol = container_of(isa, struct zoltrix, isa); |
1da177e4 LT |
167 | int a, b; |
168 | ||
6b39246c HV |
169 | outb(0x00, isa->io); /* This stuff I found to do nothing */ |
170 | outb(zol->curvol, isa->io); | |
1da177e4 LT |
171 | msleep(20); |
172 | ||
6b39246c | 173 | a = inb(isa->io); |
1da177e4 | 174 | msleep(10); |
6b39246c | 175 | b = inb(isa->io); |
1da177e4 | 176 | |
6b39246c HV |
177 | return (a == b && a == 0xcf) ? |
178 | V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO; | |
1da177e4 LT |
179 | } |
180 | ||
6b39246c | 181 | static u32 zoltrix_g_signal(struct radio_isa_card *isa) |
1da177e4 | 182 | { |
6b39246c HV |
183 | struct zoltrix *zol = container_of(isa, struct zoltrix, isa); |
184 | int a, b; | |
4286c6f6 | 185 | |
6b39246c HV |
186 | outb(0x00, isa->io); /* This stuff I found to do nothing */ |
187 | outb(zol->curvol, isa->io); | |
1da177e4 LT |
188 | msleep(20); |
189 | ||
6b39246c | 190 | a = inb(isa->io); |
1da177e4 | 191 | msleep(10); |
6b39246c | 192 | b = inb(isa->io); |
a1314b1a | 193 | |
6b39246c | 194 | if (a != b) |
a1314b1a | 195 | return 0; |
a1314b1a | 196 | |
6b39246c HV |
197 | /* I found this out by playing with a binary scanner on the card io */ |
198 | return (a == 0xcf || a == 0xdf || a == 0xef) ? 0xffff : 0; | |
1da177e4 LT |
199 | } |
200 | ||
6b39246c | 201 | static int zoltrix_s_stereo(struct radio_isa_card *isa, bool stereo) |
ec632c8a | 202 | { |
6b39246c | 203 | return zoltrix_s_frequency(isa, isa->freq); |
ec632c8a | 204 | } |
1da177e4 | 205 | |
6b39246c HV |
206 | static const struct radio_isa_ops zoltrix_ops = { |
207 | .alloc = zoltrix_alloc, | |
208 | .s_mute_volume = zoltrix_s_mute_volume, | |
209 | .s_frequency = zoltrix_s_frequency, | |
210 | .s_stereo = zoltrix_s_stereo, | |
211 | .g_rxsubchans = zoltrix_g_rxsubchans, | |
212 | .g_signal = zoltrix_g_signal, | |
1da177e4 LT |
213 | }; |
214 | ||
6b39246c HV |
215 | static const int zoltrix_ioports[] = { 0x20c, 0x30c }; |
216 | ||
217 | static struct radio_isa_driver zoltrix_driver = { | |
218 | .driver = { | |
219 | .match = radio_isa_match, | |
220 | .probe = radio_isa_probe, | |
221 | .remove = radio_isa_remove, | |
222 | .driver = { | |
223 | .name = "radio-zoltrix", | |
224 | }, | |
225 | }, | |
226 | .io_params = io, | |
227 | .radio_nr_params = radio_nr, | |
228 | .io_ports = zoltrix_ioports, | |
229 | .num_of_io_ports = ARRAY_SIZE(zoltrix_ioports), | |
230 | .region_size = 2, | |
231 | .card = "Zoltrix Radio Plus", | |
232 | .ops = &zoltrix_ops, | |
233 | .has_stereo = true, | |
234 | .max_volume = 15, | |
1da177e4 LT |
235 | }; |
236 | ||
237 | static int __init zoltrix_init(void) | |
238 | { | |
6b39246c | 239 | return isa_register_driver(&zoltrix_driver.driver, ZOLTRIX_MAX); |
1da177e4 LT |
240 | } |
241 | ||
ec632c8a | 242 | static void __exit zoltrix_exit(void) |
1da177e4 | 243 | { |
6b39246c | 244 | isa_unregister_driver(&zoltrix_driver.driver); |
1da177e4 LT |
245 | } |
246 | ||
247 | module_init(zoltrix_init); | |
ec632c8a | 248 | module_exit(zoltrix_exit); |
1da177e4 | 249 |