summaryrefslogtreecommitdiff
path: root/drivers/media/tuners/mc44s803.c
blob: ed8bdf7ebd99dc402ccf087a79a92fa2667bae97 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Driver for Freescale MC44S803 Low Power CMOS Broadband Tuner
 *
 *  Copyright (c) 2009 Jochen Friedrich <jochen@scram.de>
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/dvb/frontend.h>
#include <linux/i2c.h>
#include <linux/slab.h>

#include <media/dvb_frontend.h>

#include "mc44s803.h"
#include "mc44s803_priv.h"

#define mc_printk(level, format, arg...)	\
	printk(level "mc44s803: " format , ## arg)

/* Writes a single register */
static int mc44s803_writereg(struct mc44s803_priv *priv, u32 val)
{
	u8 buf[3];
	struct i2c_msg msg = {
		.addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 3
	};

	buf[0] = (val & 0xff0000) >> 16;
	buf[1] = (val & 0xff00) >> 8;
	buf[2] = (val & 0xff);

	if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
		mc_printk(KERN_WARNING, "I2C write failed\n");
		return -EREMOTEIO;
	}
	return 0;
}

/* Reads a single register */
static int mc44s803_readreg(struct mc44s803_priv *priv, u8 reg, u32 *val)
{
	u32 wval;
	u8 buf[3];
	int ret;
	struct i2c_msg msg[] = {
		{ .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,
		  .buf = buf, .len = 3 },
	};

	wval = MC44S803_REG_SM(MC44S803_REG_DATAREG, MC44S803_ADDR) |
	       MC44S803_REG_SM(reg, MC44S803_D);

	ret = mc44s803_writereg(priv, wval);
	if (ret)
		return ret;

	if (i2c_transfer(priv->i2c, msg, 1) != 1) {
		mc_printk(KERN_WARNING, "I2C read failed\n");
		return -EREMOTEIO;
	}

	*val = (buf[0] << 16) | (buf[1] << 8) | buf[2];

	return 0;
}

static void mc44s803_release(struct dvb_frontend *fe)
{
	struct mc44s803_priv *priv = fe->tuner_priv;

	fe->tuner_priv = NULL;
	kfree(priv);
}

static int mc44s803_init(struct dvb_frontend *fe)
{
	struct mc44s803_priv *priv = fe->tuner_priv;
	u32 val;
	int err;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);

/* Reset chip */
	val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR) |
	      MC44S803_REG_SM(1, MC44S803_RS);

	err = mc44s803_writereg(priv, val);
	if (err)
		goto exit;

	val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR);

	err = mc44s803_writereg(priv, val);
	if (err)
		goto exit;

/* Power Up and Start Osc */

	val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) |
	      MC44S803_REG_SM(0xC0, MC44S803_REFOSC) |
	      MC44S803_REG_SM(1, MC44S803_OSCSEL);

	err = mc44s803_writereg(priv, val);
	if (err)
		goto exit;

	val = MC44S803_REG_SM(MC44S803_REG_POWER, MC44S803_ADDR) |
	      MC44S803_REG_SM(0x200, MC44S803_POWER);

	err = mc44s803_writereg(priv, val);
	if (err)
		goto exit;

	msleep(10);

	val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) |
	      MC44S803_REG_SM(0x40, MC44S803_REFOSC) |
	      MC44S803_REG_SM(1, MC44S803_OSCSEL);

	err = mc44s803_writereg(priv, val);
	if (err)
		goto exit;

	msleep(20);

/* Setup Mixer */

	val = MC44S803_REG_SM(MC44S803_REG_MIXER, MC44S803_ADDR) |
	      MC44S803_REG_SM(1, MC44S803_TRI_STATE) |
	      MC44S803_REG_SM(0x7F, MC44S803_MIXER_RES);

	err = mc44s803_writereg(priv, val);
	if (err)
		goto exit;

/* Setup Cirquit Adjust */

	val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) |
	      MC44S803_REG_SM(1, MC44S803_G1) |
	      MC44S803_REG_SM(1, MC44S803_G3) |
	      MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) |
	      MC44S803_REG_SM(1, MC44S803_G6) |
	      MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) |
	      MC44S803_REG_SM(0x3, MC44S803_LP) |
	      MC44S803_REG_SM(1, MC44S803_CLRF) |
	      MC44S803_REG_SM(1, MC44S803_CLIF);

	err = mc44s803_writereg(priv, val);
	if (err)
		goto exit;

	val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) |
	      MC44S803_REG_SM(1, MC44S803_G1) |
	      MC44S803_REG_SM(1, MC44S803_G3) |
	      MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) |
	      MC44S803_REG_SM(1, MC44S803_G6) |
	      MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) |
	      MC44S803_REG_SM(0x3, MC44S803_LP);

	err = mc44s803_writereg(priv, val);
	if (err)
		goto exit;

/* Setup Digtune */

	val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
	      MC44S803_REG_SM(3, MC44S803_XOD);

	err = mc44s803_writereg(priv, val);
	if (err)
		goto exit;

/* Setup AGC */

	val = MC44S803_REG_SM(MC44S803_REG_LNAAGC, MC44S803_ADDR) |
	      MC44S803_REG_SM(1, MC44S803_AT1) |
	      MC44S803_REG_SM(1, MC44S803_AT2) |
	      MC44S803_REG_SM(1, MC44S803_AGC_AN_DIG) |
	      MC44S803_REG_SM(1, MC44S803_AGC_READ_EN) |
	      MC44S803_REG_SM(1, MC44S803_LNA0);

	err = mc44s803_writereg(priv, val);
	if (err)
		goto exit;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0);
	return 0;

exit:
	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0);

	mc_printk(KERN_WARNING, "I/O Error\n");
	return err;
}

static int mc44s803_set_params(struct dvb_frontend *fe)
{
	struct mc44s803_priv *priv = fe->tuner_priv;
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	u32 r1, r2, n1, n2, lo1, lo2, freq, val;
	int err;

	priv->frequency = c->frequency;

	r1 = MC44S803_OSC / 1000000;
	r2 = MC44S803_OSC /  100000;

	n1 = (c->frequency + MC44S803_IF1 + 500000) / 1000000;
	freq = MC44S803_OSC / r1 * n1;
	lo1 = ((60 * n1) + (r1 / 2)) / r1;
	freq = freq - c->frequency;

	n2 = (freq - MC44S803_IF2 + 50000) / 100000;
	lo2 = ((60 * n2) + (r2 / 2)) / r2;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);

	val = MC44S803_REG_SM(MC44S803_REG_REFDIV, MC44S803_ADDR) |
	      MC44S803_REG_SM(r1-1, MC44S803_R1) |
	      MC44S803_REG_SM(r2-1, MC44S803_R2) |
	      MC44S803_REG_SM(1, MC44S803_REFBUF_EN);

	err = mc44s803_writereg(priv, val);
	if (err)
		goto exit;

	val = MC44S803_REG_SM(MC44S803_REG_LO1, MC44S803_ADDR) |
	      MC44S803_REG_SM(n1-2, MC44S803_LO1);

	err = mc44s803_writereg(priv, val);
	if (err)
		goto exit;

	val = MC44S803_REG_SM(MC44S803_REG_LO2, MC44S803_ADDR) |
	      MC44S803_REG_SM(n2-2, MC44S803_LO2);

	err = mc44s803_writereg(priv, val);
	if (err)
		goto exit;

	val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
	      MC44S803_REG_SM(1, MC44S803_DA) |
	      MC44S803_REG_SM(lo1, MC44S803_LO_REF) |
	      MC44S803_REG_SM(1, MC44S803_AT);

	err = mc44s803_writereg(priv, val);
	if (err)
		goto exit;

	val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) |
	      MC44S803_REG_SM(2, MC44S803_DA) |
	      MC44S803_REG_SM(lo2, MC44S803_LO_REF) |
	      MC44S803_REG_SM(1, MC44S803_AT);

	err = mc44s803_writereg(priv, val);
	if (err)
		goto exit;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0);

	return 0;

exit:
	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0);

	mc_printk(KERN_WARNING, "I/O Error\n");
	return err;
}

static int mc44s803_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
	struct mc44s803_priv *priv = fe->tuner_priv;
	*frequency = priv->frequency;
	return 0;
}

static int mc44s803_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
{
	*frequency = MC44S803_IF2; /* 36.125 MHz */
	return 0;
}

static const struct dvb_tuner_ops mc44s803_tuner_ops = {
	.info = {
		.name              = "Freescale MC44S803",
		.frequency_min_hz  =   48 * MHz,
		.frequency_max_hz  = 1000 * MHz,
		.frequency_step_hz =  100 * kHz,
	},

	.release       = mc44s803_release,
	.init          = mc44s803_init,
	.set_params    = mc44s803_set_params,
	.get_frequency = mc44s803_get_frequency,
	.get_if_frequency = mc44s803_get_if_frequency,
};

/* This functions tries to identify a MC44S803 tuner by reading the ID
   register. This is hasty. */
struct dvb_frontend *mc44s803_attach(struct dvb_frontend *fe,
	 struct i2c_adapter *i2c, struct mc44s803_config *cfg)
{
	struct mc44s803_priv *priv;
	u32 reg;
	u8 id;
	int ret;

	reg = 0;

	priv = kzalloc(sizeof(struct mc44s803_priv), GFP_KERNEL);
	if (priv == NULL)
		return NULL;

	priv->cfg = cfg;
	priv->i2c = i2c;
	priv->fe  = fe;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */

	ret = mc44s803_readreg(priv, MC44S803_REG_ID, &reg);
	if (ret)
		goto error;

	id = MC44S803_REG_MS(reg, MC44S803_ID);

	if (id != 0x14) {
		mc_printk(KERN_ERR, "unsupported ID (%x should be 0x14)\n",
			  id);
		goto error;
	}

	mc_printk(KERN_INFO, "successfully identified (ID = %x)\n", id);
	memcpy(&fe->ops.tuner_ops, &mc44s803_tuner_ops,
	       sizeof(struct dvb_tuner_ops));

	fe->tuner_priv = priv;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */

	return fe;

error:
	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */

	kfree(priv);
	return NULL;
}
EXPORT_SYMBOL_GPL(mc44s803_attach);

MODULE_AUTHOR("Jochen Friedrich");
MODULE_DESCRIPTION("Freescale MC44S803 silicon tuner driver");
MODULE_LICENSE("GPL");