1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23#include <linux/kernel.h>
24#include <linux/init.h>
25#include <linux/module.h>
26#include <linux/string.h>
27#include <linux/slab.h>
28#include "dvb_frontend.h"
29#include "cx22700.h"
30
31
32struct cx22700_state {
33
34 struct i2c_adapter* i2c;
35
36 const struct cx22700_config* config;
37
38 struct dvb_frontend frontend;
39};
40
41
42static int debug;
43#define dprintk(args...) \
44 do { \
45 if (debug) printk(KERN_DEBUG "cx22700: " args); \
46 } while (0)
47
48static u8 init_tab [] = {
49 0x04, 0x10,
50 0x05, 0x09,
51 0x06, 0x00,
52 0x08, 0x04,
53 0x09, 0x00,
54 0x0a, 0x01,
55 0x15, 0x40,
56 0x16, 0x10,
57 0x17, 0x87,
58 0x18, 0x17,
59 0x1a, 0x10,
60 0x25, 0x04,
61 0x2e, 0x00,
62 0x39, 0x00,
63 0x3a, 0x04,
64 0x45, 0x08,
65 0x46, 0x02,
66 0x47, 0x05,
67};
68
69
70static int cx22700_writereg (struct cx22700_state* state, u8 reg, u8 data)
71{
72 int ret;
73 u8 buf [] = { reg, data };
74 struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
75
76 dprintk ("%s\n", __func__);
77
78 ret = i2c_transfer (state->i2c, &msg, 1);
79
80 if (ret != 1)
81 printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
82 __func__, reg, data, ret);
83
84 return (ret != 1) ? -1 : 0;
85}
86
87static int cx22700_readreg (struct cx22700_state* state, u8 reg)
88{
89 int ret;
90 u8 b0 [] = { reg };
91 u8 b1 [] = { 0 };
92 struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
93 { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
94
95 dprintk ("%s\n", __func__);
96
97 ret = i2c_transfer (state->i2c, msg, 2);
98
99 if (ret != 2) return -EIO;
100
101 return b1[0];
102}
103
104static int cx22700_set_inversion (struct cx22700_state* state, int inversion)
105{
106 u8 val;
107
108 dprintk ("%s\n", __func__);
109
110 switch (inversion) {
111 case INVERSION_AUTO:
112 return -EOPNOTSUPP;
113 case INVERSION_ON:
114 val = cx22700_readreg (state, 0x09);
115 return cx22700_writereg (state, 0x09, val | 0x01);
116 case INVERSION_OFF:
117 val = cx22700_readreg (state, 0x09);
118 return cx22700_writereg (state, 0x09, val & 0xfe);
119 default:
120 return -EINVAL;
121 }
122}
123
124static int cx22700_set_tps(struct cx22700_state *state,
125 struct dtv_frontend_properties *p)
126{
127 static const u8 qam_tab [4] = { 0, 1, 0, 2 };
128 static const u8 fec_tab [6] = { 0, 1, 2, 0, 3, 4 };
129 u8 val;
130
131 dprintk ("%s\n", __func__);
132
133 if (p->code_rate_HP < FEC_1_2 || p->code_rate_HP > FEC_7_8)
134 return -EINVAL;
135
136 if (p->code_rate_LP < FEC_1_2 || p->code_rate_LP > FEC_7_8)
137 return -EINVAL;
138
139 if (p->code_rate_HP == FEC_4_5 || p->code_rate_LP == FEC_4_5)
140 return -EINVAL;
141
142 if (p->guard_interval < GUARD_INTERVAL_1_32 ||
143 p->guard_interval > GUARD_INTERVAL_1_4)
144 return -EINVAL;
145
146 if (p->transmission_mode != TRANSMISSION_MODE_2K &&
147 p->transmission_mode != TRANSMISSION_MODE_8K)
148 return -EINVAL;
149
150 if (p->modulation != QPSK &&
151 p->modulation != QAM_16 &&
152 p->modulation != QAM_64)
153 return -EINVAL;
154
155 if (p->hierarchy < HIERARCHY_NONE ||
156 p->hierarchy > HIERARCHY_4)
157 return -EINVAL;
158
159 if (p->bandwidth_hz > 8000000 || p->bandwidth_hz < 6000000)
160 return -EINVAL;
161
162 if (p->bandwidth_hz == 7000000)
163 cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 | 0x10));
164 else
165 cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 & ~0x10));
166
167 val = qam_tab[p->modulation - QPSK];
168 val |= p->hierarchy - HIERARCHY_NONE;
169
170 cx22700_writereg (state, 0x04, val);
171
172 val = fec_tab[p->code_rate_HP - FEC_1_2] << 3;
173 val |= fec_tab[p->code_rate_LP - FEC_1_2];
174
175 cx22700_writereg (state, 0x05, val);
176
177 val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2;
178 val |= p->transmission_mode - TRANSMISSION_MODE_2K;
179
180 cx22700_writereg (state, 0x06, val);
181
182 cx22700_writereg (state, 0x08, 0x04 | 0x02);
183 cx22700_writereg (state, 0x08, 0x04);
184
185 return 0;
186}
187
188static int cx22700_get_tps(struct cx22700_state *state,
189 struct dtv_frontend_properties *p)
190{
191 static const fe_modulation_t qam_tab [3] = { QPSK, QAM_16, QAM_64 };
192 static const fe_code_rate_t fec_tab [5] = { FEC_1_2, FEC_2_3, FEC_3_4,
193 FEC_5_6, FEC_7_8 };
194 u8 val;
195
196 dprintk ("%s\n", __func__);
197
198 if (!(cx22700_readreg(state, 0x07) & 0x20))
199 return -EAGAIN;
200
201 val = cx22700_readreg (state, 0x01);
202
203 if ((val & 0x7) > 4)
204 p->hierarchy = HIERARCHY_AUTO;
205 else
206 p->hierarchy = HIERARCHY_NONE + (val & 0x7);
207
208 if (((val >> 3) & 0x3) > 2)
209 p->modulation = QAM_AUTO;
210 else
211 p->modulation = qam_tab[(val >> 3) & 0x3];
212
213 val = cx22700_readreg (state, 0x02);
214
215 if (((val >> 3) & 0x07) > 4)
216 p->code_rate_HP = FEC_AUTO;
217 else
218 p->code_rate_HP = fec_tab[(val >> 3) & 0x07];
219
220 if ((val & 0x07) > 4)
221 p->code_rate_LP = FEC_AUTO;
222 else
223 p->code_rate_LP = fec_tab[val & 0x07];
224
225 val = cx22700_readreg (state, 0x03);
226
227 p->guard_interval = GUARD_INTERVAL_1_32 + ((val >> 6) & 0x3);
228 p->transmission_mode = TRANSMISSION_MODE_2K + ((val >> 5) & 0x1);
229
230 return 0;
231}
232
233static int cx22700_init (struct dvb_frontend* fe)
234
235{ struct cx22700_state* state = fe->demodulator_priv;
236 int i;
237
238 dprintk("cx22700_init: init chip\n");
239
240 cx22700_writereg (state, 0x00, 0x02);
241 cx22700_writereg (state, 0x00, 0x00);
242
243 msleep(10);
244
245 for (i=0; i<sizeof(init_tab); i+=2)
246 cx22700_writereg (state, init_tab[i], init_tab[i+1]);
247
248 cx22700_writereg (state, 0x00, 0x01);
249
250 return 0;
251}
252
253static int cx22700_read_status(struct dvb_frontend* fe, fe_status_t* status)
254{
255 struct cx22700_state* state = fe->demodulator_priv;
256
257 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
258 | (cx22700_readreg (state, 0x0e) << 1);
259 u8 sync = cx22700_readreg (state, 0x07);
260
261 *status = 0;
262
263 if (rs_ber < 0xff00)
264 *status |= FE_HAS_SIGNAL;
265
266 if (sync & 0x20)
267 *status |= FE_HAS_CARRIER;
268
269 if (sync & 0x10)
270 *status |= FE_HAS_VITERBI;
271
272 if (sync & 0x10)
273 *status |= FE_HAS_SYNC;
274
275 if (*status == 0x0f)
276 *status |= FE_HAS_LOCK;
277
278 return 0;
279}
280
281static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber)
282{
283 struct cx22700_state* state = fe->demodulator_priv;
284
285 *ber = cx22700_readreg (state, 0x0c) & 0x7f;
286 cx22700_writereg (state, 0x0c, 0x00);
287
288 return 0;
289}
290
291static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
292{
293 struct cx22700_state* state = fe->demodulator_priv;
294
295 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
296 | (cx22700_readreg (state, 0x0e) << 1);
297 *signal_strength = ~rs_ber;
298
299 return 0;
300}
301
302static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr)
303{
304 struct cx22700_state* state = fe->demodulator_priv;
305
306 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
307 | (cx22700_readreg (state, 0x0e) << 1);
308 *snr = ~rs_ber;
309
310 return 0;
311}
312
313static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
314{
315 struct cx22700_state* state = fe->demodulator_priv;
316
317 *ucblocks = cx22700_readreg (state, 0x0f);
318 cx22700_writereg (state, 0x0f, 0x00);
319
320 return 0;
321}
322
323static int cx22700_set_frontend(struct dvb_frontend *fe)
324{
325 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
326 struct cx22700_state* state = fe->demodulator_priv;
327
328 cx22700_writereg (state, 0x00, 0x02);
329 cx22700_writereg (state, 0x00, 0x00);
330
331 if (fe->ops.tuner_ops.set_params) {
332 fe->ops.tuner_ops.set_params(fe);
333 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
334 }
335
336 cx22700_set_inversion(state, c->inversion);
337 cx22700_set_tps(state, c);
338 cx22700_writereg (state, 0x37, 0x01);
339 cx22700_writereg (state, 0x00, 0x01);
340
341 return 0;
342}
343
344static int cx22700_get_frontend(struct dvb_frontend *fe)
345{
346 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
347 struct cx22700_state* state = fe->demodulator_priv;
348 u8 reg09 = cx22700_readreg (state, 0x09);
349
350 c->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF;
351 return cx22700_get_tps(state, c);
352}
353
354static int cx22700_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
355{
356 struct cx22700_state* state = fe->demodulator_priv;
357
358 if (enable) {
359 return cx22700_writereg(state, 0x0a, 0x00);
360 } else {
361 return cx22700_writereg(state, 0x0a, 0x01);
362 }
363}
364
365static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
366{
367 fesettings->min_delay_ms = 150;
368 fesettings->step_size = 166667;
369 fesettings->max_drift = 166667*2;
370 return 0;
371}
372
373static void cx22700_release(struct dvb_frontend* fe)
374{
375 struct cx22700_state* state = fe->demodulator_priv;
376 kfree(state);
377}
378
379static struct dvb_frontend_ops cx22700_ops;
380
381struct dvb_frontend* cx22700_attach(const struct cx22700_config* config,
382 struct i2c_adapter* i2c)
383{
384 struct cx22700_state* state = NULL;
385
386
387 state = kzalloc(sizeof(struct cx22700_state), GFP_KERNEL);
388 if (state == NULL) goto error;
389
390
391 state->config = config;
392 state->i2c = i2c;
393
394
395 if (cx22700_readreg(state, 0x07) < 0) goto error;
396
397
398 memcpy(&state->frontend.ops, &cx22700_ops, sizeof(struct dvb_frontend_ops));
399 state->frontend.demodulator_priv = state;
400 return &state->frontend;
401
402error:
403 kfree(state);
404 return NULL;
405}
406
407static struct dvb_frontend_ops cx22700_ops = {
408 .delsys = { SYS_DVBT },
409 .info = {
410 .name = "Conexant CX22700 DVB-T",
411 .frequency_min = 470000000,
412 .frequency_max = 860000000,
413 .frequency_stepsize = 166667,
414 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
415 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
416 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
417 FE_CAN_RECOVER
418 },
419
420 .release = cx22700_release,
421
422 .init = cx22700_init,
423 .i2c_gate_ctrl = cx22700_i2c_gate_ctrl,
424
425 .set_frontend = cx22700_set_frontend,
426 .get_frontend = cx22700_get_frontend,
427 .get_tune_settings = cx22700_get_tune_settings,
428
429 .read_status = cx22700_read_status,
430 .read_ber = cx22700_read_ber,
431 .read_signal_strength = cx22700_read_signal_strength,
432 .read_snr = cx22700_read_snr,
433 .read_ucblocks = cx22700_read_ucblocks,
434};
435
436module_param(debug, int, 0644);
437MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
438
439MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver");
440MODULE_AUTHOR("Holger Waechtler");
441MODULE_LICENSE("GPL");
442
443EXPORT_SYMBOL(cx22700_attach);
444
