1/*
2 * NXP TDA18212HN silicon tuner driver
3 *
4 * Copyright (C) 2011 Antti Palosaari <crope@iki.fi>
5 *
6 *    This program is free software; you can redistribute it and/or modify
7 *    it under the terms of the GNU General Public License as published by
8 *    the Free Software Foundation; either version 2 of the License, or
9 *    (at your option) any later version.
10 *
11 *    This program is distributed in the hope that it will be useful,
12 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
13 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 *    GNU General Public License for more details.
15 *
16 *    You should have received a copy of the GNU General Public License along
17 *    with this program; if not, write to the Free Software Foundation, Inc.,
18 *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 */
20
21#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23#include "tda18212.h"
24
25struct tda18212_priv {
26	struct tda18212_config *cfg;
27	struct i2c_adapter *i2c;
28
29	u32 if_frequency;
30};
31
32#define dbg(fmt, arg...)					\
33do {								\
34	if (debug)						\
35		pr_info("%s: " fmt, __func__, ##arg);		\
36} while (0)
37
38static int debug;
39module_param(debug, int, 0644);
40MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
41
42/* write multiple registers */
43static int tda18212_wr_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
44	int len)
45{
46	int ret;
47	u8 buf[len+1];
48	struct i2c_msg msg[1] = {
49		{
50			.addr = priv->cfg->i2c_address,
51			.flags = 0,
52			.len = sizeof(buf),
53			.buf = buf,
54		}
55	};
56
57	buf[0] = reg;
58	memcpy(&buf[1], val, len);
59
60	ret = i2c_transfer(priv->i2c, msg, 1);
61	if (ret == 1) {
62		ret = 0;
63	} else {
64		pr_warn("i2c wr failed ret:%d reg:%02x len:%d\n",
65			ret, reg, len);
66		ret = -EREMOTEIO;
67	}
68	return ret;
69}
70
71/* read multiple registers */
72static int tda18212_rd_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
73	int len)
74{
75	int ret;
76	u8 buf[len];
77	struct i2c_msg msg[2] = {
78		{
79			.addr = priv->cfg->i2c_address,
80			.flags = 0,
81			.len = 1,
82			.buf = &reg,
83		}, {
84			.addr = priv->cfg->i2c_address,
85			.flags = I2C_M_RD,
86			.len = sizeof(buf),
87			.buf = buf,
88		}
89	};
90
91	ret = i2c_transfer(priv->i2c, msg, 2);
92	if (ret == 2) {
93		memcpy(val, buf, len);
94		ret = 0;
95	} else {
96		pr_warn("i2c rd failed ret:%d reg:%02x len:%d\n",
97			ret, reg, len);
98		ret = -EREMOTEIO;
99	}
100
101	return ret;
102}
103
104/* write single register */
105static int tda18212_wr_reg(struct tda18212_priv *priv, u8 reg, u8 val)
106{
107	return tda18212_wr_regs(priv, reg, &val, 1);
108}
109
110/* read single register */
111static int tda18212_rd_reg(struct tda18212_priv *priv, u8 reg, u8 *val)
112{
113	return tda18212_rd_regs(priv, reg, val, 1);
114}
115
116#if 0 /* keep, useful when developing driver */
117static void tda18212_dump_regs(struct tda18212_priv *priv)
118{
119	int i;
120	u8 buf[256];
121
122	#define TDA18212_RD_LEN 32
123	for (i = 0; i < sizeof(buf); i += TDA18212_RD_LEN)
124		tda18212_rd_regs(priv, i, &buf[i], TDA18212_RD_LEN);
125
126	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 32, 1, buf,
127		sizeof(buf), true);
128
129	return;
130}
131#endif
132
133static int tda18212_set_params(struct dvb_frontend *fe)
134{
135	struct tda18212_priv *priv = fe->tuner_priv;
136	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
137	int ret, i;
138	u32 if_khz;
139	u8 buf[9];
140	#define DVBT_6   0
141	#define DVBT_7   1
142	#define DVBT_8   2
143	#define DVBT2_6  3
144	#define DVBT2_7  4
145	#define DVBT2_8  5
146	#define DVBC_6   6
147	#define DVBC_8   7
148	static const u8 bw_params[][3] = {
149		     /* reg:   0f    13    23 */
150		[DVBT_6]  = { 0xb3, 0x20, 0x03 },
151		[DVBT_7]  = { 0xb3, 0x31, 0x01 },
152		[DVBT_8]  = { 0xb3, 0x22, 0x01 },
153		[DVBT2_6] = { 0xbc, 0x20, 0x03 },
154		[DVBT2_7] = { 0xbc, 0x72, 0x03 },
155		[DVBT2_8] = { 0xbc, 0x22, 0x01 },
156		[DVBC_6]  = { 0x92, 0x50, 0x03 },
157		[DVBC_8]  = { 0x92, 0x53, 0x03 },
158	};
159
160	dbg("delsys=%d RF=%d BW=%d\n",
161	    c->delivery_system, c->frequency, c->bandwidth_hz);
162
163	if (fe->ops.i2c_gate_ctrl)
164		fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
165
166	switch (c->delivery_system) {
167	case SYS_DVBT:
168		switch (c->bandwidth_hz) {
169		case 6000000:
170			if_khz = priv->cfg->if_dvbt_6;
171			i = DVBT_6;
172			break;
173		case 7000000:
174			if_khz = priv->cfg->if_dvbt_7;
175			i = DVBT_7;
176			break;
177		case 8000000:
178			if_khz = priv->cfg->if_dvbt_8;
179			i = DVBT_8;
180			break;
181		default:
182			ret = -EINVAL;
183			goto error;
184		}
185		break;
186	case SYS_DVBT2:
187		switch (c->bandwidth_hz) {
188		case 6000000:
189			if_khz = priv->cfg->if_dvbt2_6;
190			i = DVBT2_6;
191			break;
192		case 7000000:
193			if_khz = priv->cfg->if_dvbt2_7;
194			i = DVBT2_7;
195			break;
196		case 8000000:
197			if_khz = priv->cfg->if_dvbt2_8;
198			i = DVBT2_8;
199			break;
200		default:
201			ret = -EINVAL;
202			goto error;
203		}
204		break;
205	case SYS_DVBC_ANNEX_A:
206	case SYS_DVBC_ANNEX_C:
207		if_khz = priv->cfg->if_dvbc;
208		i = DVBC_8;
209		break;
210	default:
211		ret = -EINVAL;
212		goto error;
213	}
214
215	ret = tda18212_wr_reg(priv, 0x23, bw_params[i][2]);
216	if (ret)
217		goto error;
218
219	ret = tda18212_wr_reg(priv, 0x06, 0x00);
220	if (ret)
221		goto error;
222
223	ret = tda18212_wr_reg(priv, 0x0f, bw_params[i][0]);
224	if (ret)
225		goto error;
226
227	buf[0] = 0x02;
228	buf[1] = bw_params[i][1];
229	buf[2] = 0x03; /* default value */
230	buf[3] = DIV_ROUND_CLOSEST(if_khz, 50);
231	buf[4] = ((c->frequency / 1000) >> 16) & 0xff;
232	buf[5] = ((c->frequency / 1000) >>  8) & 0xff;
233	buf[6] = ((c->frequency / 1000) >>  0) & 0xff;
234	buf[7] = 0xc1;
235	buf[8] = 0x01;
236	ret = tda18212_wr_regs(priv, 0x12, buf, sizeof(buf));
237	if (ret)
238		goto error;
239
240	/* actual IF rounded as it is on register */
241	priv->if_frequency = buf[3] * 50 * 1000;
242
243exit:
244	if (fe->ops.i2c_gate_ctrl)
245		fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
246
247	return ret;
248
249error:
250	dbg("failed:%d\n", ret);
251	goto exit;
252}
253
254static int tda18212_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
255{
256	struct tda18212_priv *priv = fe->tuner_priv;
257
258	*frequency = priv->if_frequency;
259
260	return 0;
261}
262
263static int tda18212_release(struct dvb_frontend *fe)
264{
265	kfree(fe->tuner_priv);
266	fe->tuner_priv = NULL;
267	return 0;
268}
269
270static const struct dvb_tuner_ops tda18212_tuner_ops = {
271	.info = {
272		.name           = "NXP TDA18212",
273
274		.frequency_min  =  48000000,
275		.frequency_max  = 864000000,
276		.frequency_step =      1000,
277	},
278
279	.release       = tda18212_release,
280
281	.set_params    = tda18212_set_params,
282	.get_if_frequency = tda18212_get_if_frequency,
283};
284
285struct dvb_frontend *tda18212_attach(struct dvb_frontend *fe,
286	struct i2c_adapter *i2c, struct tda18212_config *cfg)
287{
288	struct tda18212_priv *priv = NULL;
289	int ret;
290	u8 val;
291
292	priv = kzalloc(sizeof(struct tda18212_priv), GFP_KERNEL);
293	if (priv == NULL)
294		return NULL;
295
296	priv->cfg = cfg;
297	priv->i2c = i2c;
298	fe->tuner_priv = priv;
299
300	if (fe->ops.i2c_gate_ctrl)
301		fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
302
303	/* check if the tuner is there */
304	ret = tda18212_rd_reg(priv, 0x00, &val);
305
306	if (fe->ops.i2c_gate_ctrl)
307		fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
308
309	dbg("ret:%d chip ID:%02x\n", ret, val);
310	if (ret || val != 0xc7) {
311		kfree(priv);
312		return NULL;
313	}
314
315	pr_info("NXP TDA18212HN successfully identified\n");
316
317	memcpy(&fe->ops.tuner_ops, &tda18212_tuner_ops,
318		sizeof(struct dvb_tuner_ops));
319
320	return fe;
321}
322EXPORT_SYMBOL(tda18212_attach);
323
324MODULE_DESCRIPTION("NXP TDA18212HN silicon tuner driver");
325MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
326MODULE_LICENSE("GPL");
327