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18#include <media/dvb_frontend.h>
19#include "ec100.h"
20
21struct ec100_state {
22 struct i2c_adapter *i2c;
23 struct dvb_frontend frontend;
24 struct ec100_config config;
25
26 u16 ber;
27};
28
29
30static int ec100_write_reg(struct ec100_state *state, u8 reg, u8 val)
31{
32 int ret;
33 u8 buf[2] = {reg, val};
34 struct i2c_msg msg[1] = {
35 {
36 .addr = state->config.demod_address,
37 .flags = 0,
38 .len = sizeof(buf),
39 .buf = buf,
40 }
41 };
42
43 ret = i2c_transfer(state->i2c, msg, 1);
44 if (ret == 1) {
45 ret = 0;
46 } else {
47 dev_warn(&state->i2c->dev, "%s: i2c wr failed=%d reg=%02x\n",
48 KBUILD_MODNAME, ret, reg);
49 ret = -EREMOTEIO;
50 }
51
52 return ret;
53}
54
55
56static int ec100_read_reg(struct ec100_state *state, u8 reg, u8 *val)
57{
58 int ret;
59 struct i2c_msg msg[2] = {
60 {
61 .addr = state->config.demod_address,
62 .flags = 0,
63 .len = 1,
64 .buf = ®
65 }, {
66 .addr = state->config.demod_address,
67 .flags = I2C_M_RD,
68 .len = 1,
69 .buf = val
70 }
71 };
72
73 ret = i2c_transfer(state->i2c, msg, 2);
74 if (ret == 2) {
75 ret = 0;
76 } else {
77 dev_warn(&state->i2c->dev, "%s: i2c rd failed=%d reg=%02x\n",
78 KBUILD_MODNAME, ret, reg);
79 ret = -EREMOTEIO;
80 }
81
82 return ret;
83}
84
85static int ec100_set_frontend(struct dvb_frontend *fe)
86{
87 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
88 struct ec100_state *state = fe->demodulator_priv;
89 int ret;
90 u8 tmp, tmp2;
91
92 dev_dbg(&state->i2c->dev, "%s: frequency=%d bandwidth_hz=%d\n",
93 __func__, c->frequency, c->bandwidth_hz);
94
95
96 if (fe->ops.tuner_ops.set_params)
97 fe->ops.tuner_ops.set_params(fe);
98
99 ret = ec100_write_reg(state, 0x04, 0x06);
100 if (ret)
101 goto error;
102 ret = ec100_write_reg(state, 0x67, 0x58);
103 if (ret)
104 goto error;
105 ret = ec100_write_reg(state, 0x05, 0x18);
106 if (ret)
107 goto error;
108
109
110
111
112
113
114
115
116
117 switch (c->bandwidth_hz) {
118 case 6000000:
119 tmp = 0xb7;
120 tmp2 = 0x55;
121 break;
122 case 7000000:
123 tmp = 0x00;
124 tmp2 = 0x64;
125 break;
126 case 8000000:
127 default:
128 tmp = 0x49;
129 tmp2 = 0x72;
130 }
131
132 ret = ec100_write_reg(state, 0x1b, tmp);
133 if (ret)
134 goto error;
135 ret = ec100_write_reg(state, 0x1c, tmp2);
136 if (ret)
137 goto error;
138
139 ret = ec100_write_reg(state, 0x0c, 0xbb);
140 if (ret)
141 goto error;
142 ret = ec100_write_reg(state, 0x0d, 0x31);
143 if (ret)
144 goto error;
145
146 ret = ec100_write_reg(state, 0x08, 0x24);
147 if (ret)
148 goto error;
149
150 ret = ec100_write_reg(state, 0x00, 0x00);
151 if (ret)
152 goto error;
153 ret = ec100_write_reg(state, 0x00, 0x20);
154 if (ret)
155 goto error;
156
157 return ret;
158error:
159 dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
160 return ret;
161}
162
163static int ec100_get_tune_settings(struct dvb_frontend *fe,
164 struct dvb_frontend_tune_settings *fesettings)
165{
166 fesettings->min_delay_ms = 300;
167 fesettings->step_size = 0;
168 fesettings->max_drift = 0;
169
170 return 0;
171}
172
173static int ec100_read_status(struct dvb_frontend *fe, enum fe_status *status)
174{
175 struct ec100_state *state = fe->demodulator_priv;
176 int ret;
177 u8 tmp;
178 *status = 0;
179
180 ret = ec100_read_reg(state, 0x42, &tmp);
181 if (ret)
182 goto error;
183
184 if (tmp & 0x80) {
185
186 *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI |
187 FE_HAS_SYNC | FE_HAS_LOCK;
188 } else {
189 ret = ec100_read_reg(state, 0x01, &tmp);
190 if (ret)
191 goto error;
192
193 if (tmp & 0x10) {
194
195 *status |= FE_HAS_SIGNAL;
196 if (!(tmp & 0x01)) {
197
198 *status |= FE_HAS_CARRIER | FE_HAS_VITERBI;
199 }
200 }
201 }
202
203 return ret;
204error:
205 dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
206 return ret;
207}
208
209static int ec100_read_ber(struct dvb_frontend *fe, u32 *ber)
210{
211 struct ec100_state *state = fe->demodulator_priv;
212 int ret;
213 u8 tmp, tmp2;
214 u16 ber2;
215
216 *ber = 0;
217
218 ret = ec100_read_reg(state, 0x65, &tmp);
219 if (ret)
220 goto error;
221 ret = ec100_read_reg(state, 0x66, &tmp2);
222 if (ret)
223 goto error;
224
225 ber2 = (tmp2 << 8) | tmp;
226
227
228 if (ber2 < state->ber)
229 *ber = ber2;
230 else
231 *ber = ber2 - state->ber;
232
233 state->ber = ber2;
234
235 return ret;
236error:
237 dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
238 return ret;
239}
240
241static int ec100_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
242{
243 struct ec100_state *state = fe->demodulator_priv;
244 int ret;
245 u8 tmp;
246
247 ret = ec100_read_reg(state, 0x24, &tmp);
248 if (ret) {
249 *strength = 0;
250 goto error;
251 }
252
253 *strength = ((tmp << 8) | tmp);
254
255 return ret;
256error:
257 dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
258 return ret;
259}
260
261static int ec100_read_snr(struct dvb_frontend *fe, u16 *snr)
262{
263 *snr = 0;
264 return 0;
265}
266
267static int ec100_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
268{
269 *ucblocks = 0;
270 return 0;
271}
272
273static void ec100_release(struct dvb_frontend *fe)
274{
275 struct ec100_state *state = fe->demodulator_priv;
276 kfree(state);
277}
278
279static const struct dvb_frontend_ops ec100_ops;
280
281struct dvb_frontend *ec100_attach(const struct ec100_config *config,
282 struct i2c_adapter *i2c)
283{
284 int ret;
285 struct ec100_state *state = NULL;
286 u8 tmp;
287
288
289 state = kzalloc(sizeof(struct ec100_state), GFP_KERNEL);
290 if (state == NULL)
291 goto error;
292
293
294 state->i2c = i2c;
295 memcpy(&state->config, config, sizeof(struct ec100_config));
296
297
298 ret = ec100_read_reg(state, 0x33, &tmp);
299 if (ret || tmp != 0x0b)
300 goto error;
301
302
303 memcpy(&state->frontend.ops, &ec100_ops,
304 sizeof(struct dvb_frontend_ops));
305 state->frontend.demodulator_priv = state;
306
307 return &state->frontend;
308error:
309 kfree(state);
310 return NULL;
311}
312EXPORT_SYMBOL(ec100_attach);
313
314static const struct dvb_frontend_ops ec100_ops = {
315 .delsys = { SYS_DVBT },
316 .info = {
317 .name = "E3C EC100 DVB-T",
318 .caps =
319 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
320 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
321 FE_CAN_QPSK | FE_CAN_QAM_16 |
322 FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
323 FE_CAN_TRANSMISSION_MODE_AUTO |
324 FE_CAN_GUARD_INTERVAL_AUTO |
325 FE_CAN_HIERARCHY_AUTO |
326 FE_CAN_MUTE_TS
327 },
328
329 .release = ec100_release,
330 .set_frontend = ec100_set_frontend,
331 .get_tune_settings = ec100_get_tune_settings,
332 .read_status = ec100_read_status,
333 .read_ber = ec100_read_ber,
334 .read_signal_strength = ec100_read_signal_strength,
335 .read_snr = ec100_read_snr,
336 .read_ucblocks = ec100_read_ucblocks,
337};
338
339MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
340MODULE_DESCRIPTION("E3C EC100 DVB-T demodulator driver");
341MODULE_LICENSE("GPL");
342
