summaryrefslogtreecommitdiffstats
path: root/drivers/media/common/tuners/tda18212.c
blob: e29cc2bc113a91604f03b009a7f2877dd4a7d0e2 (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
/*
 * NXP TDA18212HN silicon tuner driver
 *
 * Copyright (C) 2011 Antti Palosaari <crope@iki.fi>
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License along
 *    with this program; if not, write to the Free Software Foundation, Inc.,
 *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include "tda18212.h"

struct tda18212_priv {
	struct tda18212_config *cfg;
	struct i2c_adapter *i2c;
};

#define dbg(fmt, arg...)					\
do {								\
	if (debug)						\
		pr_info("%s: " fmt, __func__, ##arg);		\
} while (0)

static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");

/* write multiple registers */
static int tda18212_wr_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
	int len)
{
	int ret;
	u8 buf[len+1];
	struct i2c_msg msg[1] = {
		{
			.addr = priv->cfg->i2c_address,
			.flags = 0,
			.len = sizeof(buf),
			.buf = buf,
		}
	};

	buf[0] = reg;
	memcpy(&buf[1], val, len);

	ret = i2c_transfer(priv->i2c, msg, 1);
	if (ret == 1) {
		ret = 0;
	} else {
		pr_warn("i2c wr failed ret:%d reg:%02x len:%d\n",
			ret, reg, len);
		ret = -EREMOTEIO;
	}
	return ret;
}

/* read multiple registers */
static int tda18212_rd_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
	int len)
{
	int ret;
	u8 buf[len];
	struct i2c_msg msg[2] = {
		{
			.addr = priv->cfg->i2c_address,
			.flags = 0,
			.len = 1,
			.buf = &reg,
		}, {
			.addr = priv->cfg->i2c_address,
			.flags = I2C_M_RD,
			.len = sizeof(buf),
			.buf = buf,
		}
	};

	ret = i2c_transfer(priv->i2c, msg, 2);
	if (ret == 2) {
		memcpy(val, buf, len);
		ret = 0;
	} else {
		pr_warn("i2c rd failed ret:%d reg:%02x len:%d\n",
			ret, reg, len);
		ret = -EREMOTEIO;
	}

	return ret;
}

/* write single register */
static int tda18212_wr_reg(struct tda18212_priv *priv, u8 reg, u8 val)
{
	return tda18212_wr_regs(priv, reg, &val, 1);
}

/* read single register */
static int tda18212_rd_reg(struct tda18212_priv *priv, u8 reg, u8 *val)
{
	return tda18212_rd_regs(priv, reg, val, 1);
}

#if 0 /* keep, useful when developing driver */
static void tda18212_dump_regs(struct tda18212_priv *priv)
{
	int i;
	u8 buf[256];

	#define TDA18212_RD_LEN 32
	for (i = 0; i < sizeof(buf); i += TDA18212_RD_LEN)
		tda18212_rd_regs(priv, i, &buf[i], TDA18212_RD_LEN);

	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 32, 1, buf,
		sizeof(buf), true);

	return;
}
#endif

static int tda18212_set_params(struct dvb_frontend *fe,
	struct dvb_frontend_parameters *p)
{
	struct tda18212_priv *priv = fe->tuner_priv;
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	int ret, i;
	u32 if_khz;
	u8 buf[9];
	static const u8 bw_params[][3] = {
		/*  0f    13    23 */
		{ 0xb3, 0x20, 0x03 }, /* DVB-T 6 MHz */
		{ 0xb3, 0x31, 0x01 }, /* DVB-T 7 MHz */
		{ 0xb3, 0x22, 0x01 }, /* DVB-T 8 MHz */
		{ 0x92, 0x53, 0x03 }, /* DVB-C */
	};

	dbg("delsys=%d RF=%d BW=%d\n",
	    c->delivery_system, c->frequency, c->bandwidth_hz);

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */

	switch (c->delivery_system) {
	case SYS_DVBT:
		switch (c->bandwidth_hz) {
		case 6000000:
			if_khz = priv->cfg->if_dvbt_6;
			i = 0;
			break;
		case 7000000:
			if_khz = priv->cfg->if_dvbt_7;
			i = 1;
			break;
		case 8000000:
			if_khz = priv->cfg->if_dvbt_8;
			i = 2;
			break;
		default:
			ret = -EINVAL;
			goto error;
		}
		break;
	case SYS_DVBC_ANNEX_AC:
		if_khz = priv->cfg->if_dvbc;
		i = 3;
		break;
	default:
		ret = -EINVAL;
		goto error;
	}

	ret = tda18212_wr_reg(priv, 0x23, bw_params[i][2]);
	if (ret)
		goto error;

	ret = tda18212_wr_reg(priv, 0x06, 0x00);
	if (ret)
		goto error;

	ret = tda18212_wr_reg(priv, 0x0f, bw_params[i][0]);
	if (ret)
		goto error;

	buf[0] = 0x02;
	buf[1] = bw_params[i][1];
	buf[2] = 0x03; /* default value */
	buf[3] = if_khz / 50;
	buf[4] = ((c->frequency / 1000) >> 16) & 0xff;
	buf[5] = ((c->frequency / 1000) >>  8) & 0xff;
	buf[6] = ((c->frequency / 1000) >>  0) & 0xff;
	buf[7] = 0xc1;
	buf[8] = 0x01;
	ret = tda18212_wr_regs(priv, 0x12, buf, sizeof(buf));
	if (ret)
		goto error;

exit:
	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */

	return ret;

error:
	dbg("failed:%d\n", ret);
	goto exit;
}

static int tda18212_release(struct dvb_frontend *fe)
{
	kfree(fe->tuner_priv);
	fe->tuner_priv = NULL;
	return 0;
}

static const struct dvb_tuner_ops tda18212_tuner_ops = {
	.info = {
		.name           = "NXP TDA18212",

		.frequency_min  =  48000000,
		.frequency_max  = 864000000,
		.frequency_step =      1000,
	},

	.release       = tda18212_release,

	.set_params    = tda18212_set_params,
};

struct dvb_frontend *tda18212_attach(struct dvb_frontend *fe,
	struct i2c_adapter *i2c, struct tda18212_config *cfg)
{
	struct tda18212_priv *priv = NULL;
	int ret;
	u8 val;

	priv = kzalloc(sizeof(struct tda18212_priv), GFP_KERNEL);
	if (priv == NULL)
		return NULL;

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

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */

	/* check if the tuner is there */
	ret = tda18212_rd_reg(priv, 0x00, &val);

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */

	dbg("ret:%d chip ID:%02x\n", ret, val);
	if (ret || val != 0xc7) {
		kfree(priv);
		return NULL;
	}

	pr_info("NXP TDA18212HN successfully identified\n");

	memcpy(&fe->ops.tuner_ops, &tda18212_tuner_ops,
		sizeof(struct dvb_tuner_ops));

	return fe;
}
EXPORT_SYMBOL(tda18212_attach);

MODULE_DESCRIPTION("NXP TDA18212HN silicon tuner driver");
MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
MODULE_LICENSE("GPL");