1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | Conexant cx22700 DVB OFDM demodulator driver |
4 | |
5 | Copyright (C) 2001-2002 Convergence Integrated Media GmbH |
6 | Holger Waechtler <holger@convergence.de> |
7 | |
8 | |
9 | */ |
10 | |
11 | #include <linux/kernel.h> |
12 | #include <linux/init.h> |
13 | #include <linux/module.h> |
14 | #include <linux/string.h> |
15 | #include <linux/slab.h> |
16 | #include <media/dvb_frontend.h> |
17 | #include "cx22700.h" |
18 | |
19 | |
20 | struct cx22700_state { |
21 | |
22 | struct i2c_adapter* i2c; |
23 | |
24 | const struct cx22700_config* config; |
25 | |
26 | struct dvb_frontend frontend; |
27 | }; |
28 | |
29 | |
30 | static int debug; |
31 | #define dprintk(args...) \ |
32 | do { \ |
33 | if (debug) printk(KERN_DEBUG "cx22700: " args); \ |
34 | } while (0) |
35 | |
36 | static u8 init_tab [] = { |
37 | 0x04, 0x10, |
38 | 0x05, 0x09, |
39 | 0x06, 0x00, |
40 | 0x08, 0x04, |
41 | 0x09, 0x00, |
42 | 0x0a, 0x01, |
43 | 0x15, 0x40, |
44 | 0x16, 0x10, |
45 | 0x17, 0x87, |
46 | 0x18, 0x17, |
47 | 0x1a, 0x10, |
48 | 0x25, 0x04, |
49 | 0x2e, 0x00, |
50 | 0x39, 0x00, |
51 | 0x3a, 0x04, |
52 | 0x45, 0x08, |
53 | 0x46, 0x02, |
54 | 0x47, 0x05, |
55 | }; |
56 | |
57 | |
58 | static int cx22700_writereg (struct cx22700_state* state, u8 reg, u8 data) |
59 | { |
60 | int ret; |
61 | u8 buf [] = { reg, data }; |
62 | struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 }; |
63 | |
64 | dprintk ("%s\n" , __func__); |
65 | |
66 | ret = i2c_transfer (adap: state->i2c, msgs: &msg, num: 1); |
67 | |
68 | if (ret != 1) |
69 | printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n" , |
70 | __func__, reg, data, ret); |
71 | |
72 | return (ret != 1) ? -1 : 0; |
73 | } |
74 | |
75 | static int cx22700_readreg (struct cx22700_state* state, u8 reg) |
76 | { |
77 | int ret; |
78 | u8 b0 [] = { reg }; |
79 | u8 b1 [] = { 0 }; |
80 | struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 }, |
81 | { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } }; |
82 | |
83 | dprintk ("%s\n" , __func__); |
84 | |
85 | ret = i2c_transfer (adap: state->i2c, msgs: msg, num: 2); |
86 | |
87 | if (ret != 2) return -EIO; |
88 | |
89 | return b1[0]; |
90 | } |
91 | |
92 | static int cx22700_set_inversion (struct cx22700_state* state, int inversion) |
93 | { |
94 | u8 val; |
95 | |
96 | dprintk ("%s\n" , __func__); |
97 | |
98 | switch (inversion) { |
99 | case INVERSION_AUTO: |
100 | return -EOPNOTSUPP; |
101 | case INVERSION_ON: |
102 | val = cx22700_readreg (state, reg: 0x09); |
103 | return cx22700_writereg (state, reg: 0x09, data: val | 0x01); |
104 | case INVERSION_OFF: |
105 | val = cx22700_readreg (state, reg: 0x09); |
106 | return cx22700_writereg (state, reg: 0x09, data: val & 0xfe); |
107 | default: |
108 | return -EINVAL; |
109 | } |
110 | } |
111 | |
112 | static int cx22700_set_tps(struct cx22700_state *state, |
113 | struct dtv_frontend_properties *p) |
114 | { |
115 | static const u8 qam_tab [4] = { 0, 1, 0, 2 }; |
116 | static const u8 fec_tab [6] = { 0, 1, 2, 0, 3, 4 }; |
117 | u8 val; |
118 | |
119 | dprintk ("%s\n" , __func__); |
120 | |
121 | if (p->code_rate_HP < FEC_1_2 || p->code_rate_HP > FEC_7_8) |
122 | return -EINVAL; |
123 | |
124 | if (p->code_rate_LP < FEC_1_2 || p->code_rate_LP > FEC_7_8) |
125 | return -EINVAL; |
126 | |
127 | if (p->code_rate_HP == FEC_4_5 || p->code_rate_LP == FEC_4_5) |
128 | return -EINVAL; |
129 | |
130 | if ((int)p->guard_interval < GUARD_INTERVAL_1_32 || |
131 | p->guard_interval > GUARD_INTERVAL_1_4) |
132 | return -EINVAL; |
133 | |
134 | if (p->transmission_mode != TRANSMISSION_MODE_2K && |
135 | p->transmission_mode != TRANSMISSION_MODE_8K) |
136 | return -EINVAL; |
137 | |
138 | if (p->modulation != QPSK && |
139 | p->modulation != QAM_16 && |
140 | p->modulation != QAM_64) |
141 | return -EINVAL; |
142 | |
143 | if ((int)p->hierarchy < HIERARCHY_NONE || |
144 | p->hierarchy > HIERARCHY_4) |
145 | return -EINVAL; |
146 | |
147 | if (p->bandwidth_hz > 8000000 || p->bandwidth_hz < 6000000) |
148 | return -EINVAL; |
149 | |
150 | if (p->bandwidth_hz == 7000000) |
151 | cx22700_writereg (state, reg: 0x09, data: cx22700_readreg (state, reg: 0x09 | 0x10)); |
152 | else |
153 | cx22700_writereg (state, reg: 0x09, data: cx22700_readreg (state, reg: 0x09 & ~0x10)); |
154 | |
155 | val = qam_tab[p->modulation - QPSK]; |
156 | val |= p->hierarchy - HIERARCHY_NONE; |
157 | |
158 | cx22700_writereg (state, reg: 0x04, data: val); |
159 | |
160 | if (p->code_rate_HP - FEC_1_2 >= sizeof(fec_tab) || |
161 | p->code_rate_LP - FEC_1_2 >= sizeof(fec_tab)) |
162 | return -EINVAL; |
163 | val = fec_tab[p->code_rate_HP - FEC_1_2] << 3; |
164 | val |= fec_tab[p->code_rate_LP - FEC_1_2]; |
165 | |
166 | cx22700_writereg (state, reg: 0x05, data: val); |
167 | |
168 | val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2; |
169 | val |= p->transmission_mode - TRANSMISSION_MODE_2K; |
170 | |
171 | cx22700_writereg (state, reg: 0x06, data: val); |
172 | |
173 | cx22700_writereg (state, reg: 0x08, data: 0x04 | 0x02); /* use user tps parameters */ |
174 | cx22700_writereg (state, reg: 0x08, data: 0x04); /* restart acquisition */ |
175 | |
176 | return 0; |
177 | } |
178 | |
179 | static int cx22700_get_tps(struct cx22700_state *state, |
180 | struct dtv_frontend_properties *p) |
181 | { |
182 | static const enum fe_modulation qam_tab[3] = { QPSK, QAM_16, QAM_64 }; |
183 | static const enum fe_code_rate fec_tab[5] = { |
184 | FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_7_8 |
185 | }; |
186 | u8 val; |
187 | |
188 | dprintk ("%s\n" , __func__); |
189 | |
190 | if (!(cx22700_readreg(state, reg: 0x07) & 0x20)) /* tps valid? */ |
191 | return -EAGAIN; |
192 | |
193 | val = cx22700_readreg (state, reg: 0x01); |
194 | |
195 | if ((val & 0x7) > 4) |
196 | p->hierarchy = HIERARCHY_AUTO; |
197 | else |
198 | p->hierarchy = HIERARCHY_NONE + (val & 0x7); |
199 | |
200 | if (((val >> 3) & 0x3) > 2) |
201 | p->modulation = QAM_AUTO; |
202 | else |
203 | p->modulation = qam_tab[(val >> 3) & 0x3]; |
204 | |
205 | val = cx22700_readreg (state, reg: 0x02); |
206 | |
207 | if (((val >> 3) & 0x07) > 4) |
208 | p->code_rate_HP = FEC_AUTO; |
209 | else |
210 | p->code_rate_HP = fec_tab[(val >> 3) & 0x07]; |
211 | |
212 | if ((val & 0x07) > 4) |
213 | p->code_rate_LP = FEC_AUTO; |
214 | else |
215 | p->code_rate_LP = fec_tab[val & 0x07]; |
216 | |
217 | val = cx22700_readreg (state, reg: 0x03); |
218 | |
219 | p->guard_interval = GUARD_INTERVAL_1_32 + ((val >> 6) & 0x3); |
220 | p->transmission_mode = TRANSMISSION_MODE_2K + ((val >> 5) & 0x1); |
221 | |
222 | return 0; |
223 | } |
224 | |
225 | static int cx22700_init (struct dvb_frontend* fe) |
226 | |
227 | { struct cx22700_state* state = fe->demodulator_priv; |
228 | int i; |
229 | |
230 | dprintk("cx22700_init: init chip\n" ); |
231 | |
232 | cx22700_writereg (state, reg: 0x00, data: 0x02); /* soft reset */ |
233 | cx22700_writereg (state, reg: 0x00, data: 0x00); |
234 | |
235 | msleep(msecs: 10); |
236 | |
237 | for (i=0; i<sizeof(init_tab); i+=2) |
238 | cx22700_writereg (state, reg: init_tab[i], data: init_tab[i+1]); |
239 | |
240 | cx22700_writereg (state, reg: 0x00, data: 0x01); |
241 | |
242 | return 0; |
243 | } |
244 | |
245 | static int cx22700_read_status(struct dvb_frontend *fe, enum fe_status *status) |
246 | { |
247 | struct cx22700_state* state = fe->demodulator_priv; |
248 | |
249 | u16 rs_ber = (cx22700_readreg (state, reg: 0x0d) << 9) |
250 | | (cx22700_readreg (state, reg: 0x0e) << 1); |
251 | u8 sync = cx22700_readreg (state, reg: 0x07); |
252 | |
253 | *status = 0; |
254 | |
255 | if (rs_ber < 0xff00) |
256 | *status |= FE_HAS_SIGNAL; |
257 | |
258 | if (sync & 0x20) |
259 | *status |= FE_HAS_CARRIER; |
260 | |
261 | if (sync & 0x10) |
262 | *status |= FE_HAS_VITERBI; |
263 | |
264 | if (sync & 0x10) |
265 | *status |= FE_HAS_SYNC; |
266 | |
267 | if (*status == 0x0f) |
268 | *status |= FE_HAS_LOCK; |
269 | |
270 | return 0; |
271 | } |
272 | |
273 | static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber) |
274 | { |
275 | struct cx22700_state* state = fe->demodulator_priv; |
276 | |
277 | *ber = cx22700_readreg (state, reg: 0x0c) & 0x7f; |
278 | cx22700_writereg (state, reg: 0x0c, data: 0x00); |
279 | |
280 | return 0; |
281 | } |
282 | |
283 | static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength) |
284 | { |
285 | struct cx22700_state* state = fe->demodulator_priv; |
286 | |
287 | u16 rs_ber = (cx22700_readreg (state, reg: 0x0d) << 9) |
288 | | (cx22700_readreg (state, reg: 0x0e) << 1); |
289 | *signal_strength = ~rs_ber; |
290 | |
291 | return 0; |
292 | } |
293 | |
294 | static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr) |
295 | { |
296 | struct cx22700_state* state = fe->demodulator_priv; |
297 | |
298 | u16 rs_ber = (cx22700_readreg (state, reg: 0x0d) << 9) |
299 | | (cx22700_readreg (state, reg: 0x0e) << 1); |
300 | *snr = ~rs_ber; |
301 | |
302 | return 0; |
303 | } |
304 | |
305 | static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks) |
306 | { |
307 | struct cx22700_state* state = fe->demodulator_priv; |
308 | |
309 | *ucblocks = cx22700_readreg (state, reg: 0x0f); |
310 | cx22700_writereg (state, reg: 0x0f, data: 0x00); |
311 | |
312 | return 0; |
313 | } |
314 | |
315 | static int cx22700_set_frontend(struct dvb_frontend *fe) |
316 | { |
317 | struct dtv_frontend_properties *c = &fe->dtv_property_cache; |
318 | struct cx22700_state* state = fe->demodulator_priv; |
319 | |
320 | cx22700_writereg (state, reg: 0x00, data: 0x02); /* XXX CHECKME: soft reset*/ |
321 | cx22700_writereg (state, reg: 0x00, data: 0x00); |
322 | |
323 | if (fe->ops.tuner_ops.set_params) { |
324 | fe->ops.tuner_ops.set_params(fe); |
325 | if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); |
326 | } |
327 | |
328 | cx22700_set_inversion(state, inversion: c->inversion); |
329 | cx22700_set_tps(state, p: c); |
330 | cx22700_writereg (state, reg: 0x37, data: 0x01); /* PAL loop filter off */ |
331 | cx22700_writereg (state, reg: 0x00, data: 0x01); /* restart acquire */ |
332 | |
333 | return 0; |
334 | } |
335 | |
336 | static int cx22700_get_frontend(struct dvb_frontend *fe, |
337 | struct dtv_frontend_properties *c) |
338 | { |
339 | struct cx22700_state* state = fe->demodulator_priv; |
340 | u8 reg09 = cx22700_readreg (state, reg: 0x09); |
341 | |
342 | c->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF; |
343 | return cx22700_get_tps(state, p: c); |
344 | } |
345 | |
346 | static int cx22700_i2c_gate_ctrl(struct dvb_frontend* fe, int enable) |
347 | { |
348 | struct cx22700_state* state = fe->demodulator_priv; |
349 | |
350 | if (enable) { |
351 | return cx22700_writereg(state, reg: 0x0a, data: 0x00); |
352 | } else { |
353 | return cx22700_writereg(state, reg: 0x0a, data: 0x01); |
354 | } |
355 | } |
356 | |
357 | static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings) |
358 | { |
359 | fesettings->min_delay_ms = 150; |
360 | fesettings->step_size = 166667; |
361 | fesettings->max_drift = 166667*2; |
362 | return 0; |
363 | } |
364 | |
365 | static void cx22700_release(struct dvb_frontend* fe) |
366 | { |
367 | struct cx22700_state* state = fe->demodulator_priv; |
368 | kfree(objp: state); |
369 | } |
370 | |
371 | static const struct dvb_frontend_ops cx22700_ops; |
372 | |
373 | struct dvb_frontend* cx22700_attach(const struct cx22700_config* config, |
374 | struct i2c_adapter* i2c) |
375 | { |
376 | struct cx22700_state* state = NULL; |
377 | |
378 | /* allocate memory for the internal state */ |
379 | state = kzalloc(size: sizeof(struct cx22700_state), GFP_KERNEL); |
380 | if (state == NULL) goto error; |
381 | |
382 | /* setup the state */ |
383 | state->config = config; |
384 | state->i2c = i2c; |
385 | |
386 | /* check if the demod is there */ |
387 | if (cx22700_readreg(state, reg: 0x07) < 0) goto error; |
388 | |
389 | /* create dvb_frontend */ |
390 | memcpy(&state->frontend.ops, &cx22700_ops, sizeof(struct dvb_frontend_ops)); |
391 | state->frontend.demodulator_priv = state; |
392 | return &state->frontend; |
393 | |
394 | error: |
395 | kfree(objp: state); |
396 | return NULL; |
397 | } |
398 | |
399 | static const struct dvb_frontend_ops cx22700_ops = { |
400 | .delsys = { SYS_DVBT }, |
401 | .info = { |
402 | .name = "Conexant CX22700 DVB-T" , |
403 | .frequency_min_hz = 470 * MHz, |
404 | .frequency_max_hz = 860 * MHz, |
405 | .frequency_stepsize_hz = 166667, |
406 | .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 | |
407 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO | |
408 | FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | |
409 | FE_CAN_RECOVER |
410 | }, |
411 | |
412 | .release = cx22700_release, |
413 | |
414 | .init = cx22700_init, |
415 | .i2c_gate_ctrl = cx22700_i2c_gate_ctrl, |
416 | |
417 | .set_frontend = cx22700_set_frontend, |
418 | .get_frontend = cx22700_get_frontend, |
419 | .get_tune_settings = cx22700_get_tune_settings, |
420 | |
421 | .read_status = cx22700_read_status, |
422 | .read_ber = cx22700_read_ber, |
423 | .read_signal_strength = cx22700_read_signal_strength, |
424 | .read_snr = cx22700_read_snr, |
425 | .read_ucblocks = cx22700_read_ucblocks, |
426 | }; |
427 | |
428 | module_param(debug, int, 0644); |
429 | MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)." ); |
430 | |
431 | MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver" ); |
432 | MODULE_AUTHOR("Holger Waechtler" ); |
433 | MODULE_LICENSE("GPL" ); |
434 | |
435 | EXPORT_SYMBOL_GPL(cx22700_attach); |
436 | |