1/*
2 * E3C EC100 demodulator driver
3 *
4 * Copyright (C) 2009 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
17 *    along with this program; if not, write to the Free Software
18 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 *
20 */
21
22#include "dvb_frontend.h"
23#include "ec100.h"
24
25struct ec100_state {
26	struct i2c_adapter *i2c;
27	struct dvb_frontend frontend;
28	struct ec100_config config;
29
30	u16 ber;
31};
32
33/* write single register */
34static int ec100_write_reg(struct ec100_state *state, u8 reg, u8 val)
35{
36	int ret;
37	u8 buf[2] = {reg, val};
38	struct i2c_msg msg[1] = {
39		{
40			.addr = state->config.demod_address,
41			.flags = 0,
42			.len = sizeof(buf),
43			.buf = buf,
44		}
45	};
46
47	ret = i2c_transfer(state->i2c, msg, 1);
48	if (ret == 1) {
49		ret = 0;
50	} else {
51		dev_warn(&state->i2c->dev, "%s: i2c wr failed=%d reg=%02x\n",
52				KBUILD_MODNAME, ret, reg);
53		ret = -EREMOTEIO;
54	}
55
56	return ret;
57}
58
59/* read single register */
60static int ec100_read_reg(struct ec100_state *state, u8 reg, u8 *val)
61{
62	int ret;
63	struct i2c_msg msg[2] = {
64		{
65			.addr = state->config.demod_address,
66			.flags = 0,
67			.len = 1,
68			.buf = &reg
69		}, {
70			.addr = state->config.demod_address,
71			.flags = I2C_M_RD,
72			.len = 1,
73			.buf = val
74		}
75	};
76
77	ret = i2c_transfer(state->i2c, msg, 2);
78	if (ret == 2) {
79		ret = 0;
80	} else {
81		dev_warn(&state->i2c->dev, "%s: i2c rd failed=%d reg=%02x\n",
82				KBUILD_MODNAME, ret, reg);
83		ret = -EREMOTEIO;
84	}
85
86	return ret;
87}
88
89static int ec100_set_frontend(struct dvb_frontend *fe)
90{
91	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
92	struct ec100_state *state = fe->demodulator_priv;
93	int ret;
94	u8 tmp, tmp2;
95
96	dev_dbg(&state->i2c->dev, "%s: frequency=%d bandwidth_hz=%d\n",
97			__func__, c->frequency, c->bandwidth_hz);
98
99	/* program tuner */
100	if (fe->ops.tuner_ops.set_params)
101		fe->ops.tuner_ops.set_params(fe);
102
103	ret = ec100_write_reg(state, 0x04, 0x06);
104	if (ret)
105		goto error;
106	ret = ec100_write_reg(state, 0x67, 0x58);
107	if (ret)
108		goto error;
109	ret = ec100_write_reg(state, 0x05, 0x18);
110	if (ret)
111		goto error;
112
113	/* reg/bw |   6  |   7  |   8
114	   -------+------+------+------
115	   A 0x1b | 0xa1 | 0xe7 | 0x2c
116	   A 0x1c | 0x55 | 0x63 | 0x72
117	   -------+------+------+------
118	   B 0x1b | 0xb7 | 0x00 | 0x49
119	   B 0x1c | 0x55 | 0x64 | 0x72 */
120
121	switch (c->bandwidth_hz) {
122	case 6000000:
123		tmp = 0xb7;
124		tmp2 = 0x55;
125		break;
126	case 7000000:
127		tmp = 0x00;
128		tmp2 = 0x64;
129		break;
130	case 8000000:
131	default:
132		tmp = 0x49;
133		tmp2 = 0x72;
134	}
135
136	ret = ec100_write_reg(state, 0x1b, tmp);
137	if (ret)
138		goto error;
139	ret = ec100_write_reg(state, 0x1c, tmp2);
140	if (ret)
141		goto error;
142
143	ret = ec100_write_reg(state, 0x0c, 0xbb); /* if freq */
144	if (ret)
145		goto error;
146	ret = ec100_write_reg(state, 0x0d, 0x31); /* if freq */
147	if (ret)
148		goto error;
149
150	ret = ec100_write_reg(state, 0x08, 0x24);
151	if (ret)
152		goto error;
153
154	ret = ec100_write_reg(state, 0x00, 0x00); /* go */
155	if (ret)
156		goto error;
157	ret = ec100_write_reg(state, 0x00, 0x20); /* go */
158	if (ret)
159		goto error;
160
161	return ret;
162error:
163	dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
164	return ret;
165}
166
167static int ec100_get_tune_settings(struct dvb_frontend *fe,
168	struct dvb_frontend_tune_settings *fesettings)
169{
170	fesettings->min_delay_ms = 300;
171	fesettings->step_size = 0;
172	fesettings->max_drift = 0;
173
174	return 0;
175}
176
177static int ec100_read_status(struct dvb_frontend *fe, fe_status_t *status)
178{
179	struct ec100_state *state = fe->demodulator_priv;
180	int ret;
181	u8 tmp;
182	*status = 0;
183
184	ret = ec100_read_reg(state, 0x42, &tmp);
185	if (ret)
186		goto error;
187
188	if (tmp & 0x80) {
189		/* bit7 set - have lock */
190		*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI |
191			FE_HAS_SYNC | FE_HAS_LOCK;
192	} else {
193		ret = ec100_read_reg(state, 0x01, &tmp);
194		if (ret)
195			goto error;
196
197		if (tmp & 0x10) {
198			/* bit4 set - have signal */
199			*status |= FE_HAS_SIGNAL;
200			if (!(tmp & 0x01)) {
201				/* bit0 clear - have ~valid signal */
202				*status |= FE_HAS_CARRIER |  FE_HAS_VITERBI;
203			}
204		}
205	}
206
207	return ret;
208error:
209	dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
210	return ret;
211}
212
213static int ec100_read_ber(struct dvb_frontend *fe, u32 *ber)
214{
215	struct ec100_state *state = fe->demodulator_priv;
216	int ret;
217	u8 tmp, tmp2;
218	u16 ber2;
219
220	*ber = 0;
221
222	ret = ec100_read_reg(state, 0x65, &tmp);
223	if (ret)
224		goto error;
225	ret = ec100_read_reg(state, 0x66, &tmp2);
226	if (ret)
227		goto error;
228
229	ber2 = (tmp2 << 8) | tmp;
230
231	/* if counter overflow or clear */
232	if (ber2 < state->ber)
233		*ber = ber2;
234	else
235		*ber = ber2 - state->ber;
236
237	state->ber = ber2;
238
239	return ret;
240error:
241	dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
242	return ret;
243}
244
245static int ec100_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
246{
247	struct ec100_state *state = fe->demodulator_priv;
248	int ret;
249	u8 tmp;
250
251	ret = ec100_read_reg(state, 0x24, &tmp);
252	if (ret) {
253		*strength = 0;
254		goto error;
255	}
256
257	*strength = ((tmp << 8) | tmp);
258
259	return ret;
260error:
261	dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
262	return ret;
263}
264
265static int ec100_read_snr(struct dvb_frontend *fe, u16 *snr)
266{
267	*snr = 0;
268	return 0;
269}
270
271static int ec100_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
272{
273	*ucblocks = 0;
274	return 0;
275}
276
277static void ec100_release(struct dvb_frontend *fe)
278{
279	struct ec100_state *state = fe->demodulator_priv;
280	kfree(state);
281}
282
283static struct dvb_frontend_ops ec100_ops;
284
285struct dvb_frontend *ec100_attach(const struct ec100_config *config,
286	struct i2c_adapter *i2c)
287{
288	int ret;
289	struct ec100_state *state = NULL;
290	u8 tmp;
291
292	/* allocate memory for the internal state */
293	state = kzalloc(sizeof(struct ec100_state), GFP_KERNEL);
294	if (state == NULL)
295		goto error;
296
297	/* setup the state */
298	state->i2c = i2c;
299	memcpy(&state->config, config, sizeof(struct ec100_config));
300
301	/* check if the demod is there */
302	ret = ec100_read_reg(state, 0x33, &tmp);
303	if (ret || tmp != 0x0b)
304		goto error;
305
306	/* create dvb_frontend */
307	memcpy(&state->frontend.ops, &ec100_ops,
308		sizeof(struct dvb_frontend_ops));
309	state->frontend.demodulator_priv = state;
310
311	return &state->frontend;
312error:
313	kfree(state);
314	return NULL;
315}
316EXPORT_SYMBOL(ec100_attach);
317
318static struct dvb_frontend_ops ec100_ops = {
319	.delsys = { SYS_DVBT },
320	.info = {
321		.name = "E3C EC100 DVB-T",
322		.caps =
323			FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
324			FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
325			FE_CAN_QPSK | FE_CAN_QAM_16 |
326			FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
327			FE_CAN_TRANSMISSION_MODE_AUTO |
328			FE_CAN_GUARD_INTERVAL_AUTO |
329			FE_CAN_HIERARCHY_AUTO |
330			FE_CAN_MUTE_TS
331	},
332
333	.release = ec100_release,
334	.set_frontend = ec100_set_frontend,
335	.get_tune_settings = ec100_get_tune_settings,
336	.read_status = ec100_read_status,
337	.read_ber = ec100_read_ber,
338	.read_signal_strength = ec100_read_signal_strength,
339	.read_snr = ec100_read_snr,
340	.read_ucblocks = ec100_read_ucblocks,
341};
342
343MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
344MODULE_DESCRIPTION("E3C EC100 DVB-T demodulator driver");
345MODULE_LICENSE("GPL");
346