radio-trust.c

  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
 29MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
 30MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
 31MODULE_LICENSE("GPL");
 32MODULE_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
 42static int io[TRUST_MAX] = { [0] = CONFIG_RADIO_TRUST_PORT,
 43			      [1 ... (TRUST_MAX - 1)] = -1 };
 44static int radio_nr[TRUST_MAX] = { [0 ... (TRUST_MAX - 1)] = -1 };
 45
 46module_param_array(io, int, NULL, 0444);
 47MODULE_PARM_DESC(io, "I/O addresses of the Trust FM Radio card (0x350 or 0x358)");
 48module_param_array(radio_nr, int, NULL, 0444);
 49MODULE_PARM_DESC(radio_nr, "Radio device numbers");
 50
 51struct trust {
 52	struct radio_isa_card isa;
 53	int ioval;
 54};
 55
 56static 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
 73static 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
119static 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
129static 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
138static 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
147static 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
158static int basstreble2chip[15] = {
159	0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
160};
161
162static 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
179static const struct v4l2_ctrl_ops trust_ctrl_ops = {
180	.s_ctrl = trust_s_ctrl,
181};
182
183static 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
201static 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
210static const int trust_ioports[] = { 0x350, 0x358 };
211
212static 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
232static int __init trust_init(void)
233{
234	return isa_register_driver(&trust_driver.driver, TRUST_MAX);
235}
236
237static void __exit trust_exit(void)
238{
239	isa_unregister_driver(&trust_driver.driver);
240}
241
242module_init(trust_init);
243module_exit(trust_exit);