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780dfef3 CP |
1 | /* |
2 | * Driver for Zarlink DVB-T ZL10353 demodulator | |
3 | * | |
4 | * Copyright (C) 2006 Christopher Pascoe <c.pascoe@itee.uq.edu.au> | |
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 | * | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.= | |
20 | */ | |
21 | ||
22 | #include <linux/kernel.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/moduleparam.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/string.h> | |
28 | #include <linux/slab.h> | |
29 | ||
30 | #include "dvb_frontend.h" | |
31 | #include "zl10353_priv.h" | |
32 | #include "zl10353.h" | |
33 | ||
34 | struct zl10353_state { | |
35 | struct i2c_adapter *i2c; | |
36 | struct dvb_frontend frontend; | |
780dfef3 CP |
37 | |
38 | struct zl10353_config config; | |
39 | }; | |
40 | ||
f7f57770 AP |
41 | static int debug; |
42 | #define dprintk(args...) \ | |
43 | do { \ | |
44 | if (debug) printk(KERN_DEBUG "zl10353: " args); \ | |
45 | } while (0) | |
46 | ||
780dfef3 CP |
47 | static int debug_regs = 0; |
48 | ||
49 | static int zl10353_single_write(struct dvb_frontend *fe, u8 reg, u8 val) | |
50 | { | |
51 | struct zl10353_state *state = fe->demodulator_priv; | |
52 | u8 buf[2] = { reg, val }; | |
53 | struct i2c_msg msg = { .addr = state->config.demod_address, .flags = 0, | |
54 | .buf = buf, .len = 2 }; | |
55 | int err = i2c_transfer(state->i2c, &msg, 1); | |
56 | if (err != 1) { | |
57 | printk("zl10353: write to reg %x failed (err = %d)!\n", reg, err); | |
58 | return err; | |
59 | } | |
60 | return 0; | |
61 | } | |
62 | ||
34630409 | 63 | static int zl10353_write(struct dvb_frontend *fe, u8 *ibuf, int ilen) |
780dfef3 CP |
64 | { |
65 | int err, i; | |
66 | for (i = 0; i < ilen - 1; i++) | |
67 | if ((err = zl10353_single_write(fe, ibuf[0] + i, ibuf[i + 1]))) | |
68 | return err; | |
69 | ||
70 | return 0; | |
71 | } | |
72 | ||
73 | static int zl10353_read_register(struct zl10353_state *state, u8 reg) | |
74 | { | |
75 | int ret; | |
76 | u8 b0[1] = { reg }; | |
77 | u8 b1[1] = { 0 }; | |
78 | struct i2c_msg msg[2] = { { .addr = state->config.demod_address, | |
79 | .flags = 0, | |
80 | .buf = b0, .len = 1 }, | |
81 | { .addr = state->config.demod_address, | |
82 | .flags = I2C_M_RD, | |
83 | .buf = b1, .len = 1 } }; | |
84 | ||
85 | ret = i2c_transfer(state->i2c, msg, 2); | |
86 | ||
87 | if (ret != 2) { | |
88 | printk("%s: readreg error (reg=%d, ret==%i)\n", | |
89 | __FUNCTION__, reg, ret); | |
90 | return ret; | |
91 | } | |
92 | ||
93 | return b1[0]; | |
94 | } | |
95 | ||
c04e89b1 | 96 | static void zl10353_dump_regs(struct dvb_frontend *fe) |
780dfef3 CP |
97 | { |
98 | struct zl10353_state *state = fe->demodulator_priv; | |
99 | char buf[52], buf2[4]; | |
100 | int ret; | |
101 | u8 reg; | |
102 | ||
103 | /* Dump all registers. */ | |
104 | for (reg = 0; ; reg++) { | |
105 | if (reg % 16 == 0) { | |
106 | if (reg) | |
107 | printk(KERN_DEBUG "%s\n", buf); | |
108 | sprintf(buf, "%02x: ", reg); | |
109 | } | |
110 | ret = zl10353_read_register(state, reg); | |
111 | if (ret >= 0) | |
112 | sprintf(buf2, "%02x ", (u8)ret); | |
113 | else | |
114 | strcpy(buf2, "-- "); | |
115 | strcat(buf, buf2); | |
116 | if (reg == 0xff) | |
117 | break; | |
118 | } | |
119 | printk(KERN_DEBUG "%s\n", buf); | |
120 | } | |
121 | ||
f7f57770 AP |
122 | static void zl10353_calc_nominal_rate(struct dvb_frontend *fe, |
123 | enum fe_bandwidth bandwidth, | |
124 | u16 *nominal_rate) | |
125 | { | |
126 | u32 adc_clock = 22528; /* 20.480 MHz on the board(!?) */ | |
127 | u8 bw; | |
128 | struct zl10353_state *state = fe->demodulator_priv; | |
129 | ||
130 | if (state->config.adc_clock) | |
131 | adc_clock = state->config.adc_clock; | |
132 | ||
133 | switch (bandwidth) { | |
134 | case BANDWIDTH_6_MHZ: | |
135 | bw = 6; | |
136 | break; | |
137 | case BANDWIDTH_7_MHZ: | |
138 | bw = 7; | |
139 | break; | |
140 | case BANDWIDTH_8_MHZ: | |
141 | default: | |
142 | bw = 8; | |
143 | break; | |
144 | } | |
145 | ||
146 | *nominal_rate = (64 * bw * (1<<16) / (7 * 8) * 4000 / adc_clock + 2) / 4; | |
147 | ||
148 | dprintk("%s: bw %d, adc_clock %d => 0x%x\n", | |
149 | __FUNCTION__, bw, adc_clock, *nominal_rate); | |
150 | } | |
151 | ||
780dfef3 CP |
152 | static int zl10353_sleep(struct dvb_frontend *fe) |
153 | { | |
154 | static u8 zl10353_softdown[] = { 0x50, 0x0C, 0x44 }; | |
155 | ||
156 | zl10353_write(fe, zl10353_softdown, sizeof(zl10353_softdown)); | |
157 | return 0; | |
158 | } | |
159 | ||
160 | static int zl10353_set_parameters(struct dvb_frontend *fe, | |
161 | struct dvb_frontend_parameters *param) | |
162 | { | |
8dec0732 | 163 | struct zl10353_state *state = fe->demodulator_priv; |
f7f57770 | 164 | u16 nominal_rate; |
780dfef3 CP |
165 | u8 pllbuf[6] = { 0x67 }; |
166 | ||
167 | /* These settings set "auto-everything" and start the FSM. */ | |
168 | zl10353_single_write(fe, 0x55, 0x80); | |
169 | udelay(200); | |
170 | zl10353_single_write(fe, 0xEA, 0x01); | |
171 | udelay(200); | |
172 | zl10353_single_write(fe, 0xEA, 0x00); | |
173 | ||
174 | zl10353_single_write(fe, 0x56, 0x28); | |
175 | zl10353_single_write(fe, 0x89, 0x20); | |
176 | zl10353_single_write(fe, 0x5E, 0x00); | |
f7f57770 AP |
177 | |
178 | zl10353_calc_nominal_rate(fe, param->u.ofdm.bandwidth, &nominal_rate); | |
179 | zl10353_single_write(fe, TRL_NOMINAL_RATE_1, msb(nominal_rate)); | |
180 | zl10353_single_write(fe, TRL_NOMINAL_RATE_0, lsb(nominal_rate)); | |
181 | ||
fc3398d8 CP |
182 | zl10353_single_write(fe, 0x6C, 0xCD); |
183 | zl10353_single_write(fe, 0x6D, 0x7E); | |
0a11bb86 AP |
184 | if (fe->ops.i2c_gate_ctrl) |
185 | fe->ops.i2c_gate_ctrl(fe, 0); | |
780dfef3 | 186 | |
8dec0732 AQ |
187 | // if there is no attached secondary tuner, we call set_params to program |
188 | // a potential tuner attached somewhere else | |
189 | if (state->config.no_tuner) { | |
dea74869 PB |
190 | if (fe->ops.tuner_ops.set_params) { |
191 | fe->ops.tuner_ops.set_params(fe, param); | |
0a11bb86 AP |
192 | if (fe->ops.i2c_gate_ctrl) |
193 | fe->ops.i2c_gate_ctrl(fe, 0); | |
8dec0732 AQ |
194 | } |
195 | } | |
196 | ||
197 | // if pllbuf is defined, retrieve the settings | |
dea74869 PB |
198 | if (fe->ops.tuner_ops.calc_regs) { |
199 | fe->ops.tuner_ops.calc_regs(fe, param, pllbuf+1, 5); | |
e994b8d9 | 200 | pllbuf[1] <<= 1; |
8dec0732 AQ |
201 | } else { |
202 | // fake pllbuf settings | |
203 | pllbuf[1] = 0x61 << 1; | |
204 | pllbuf[2] = 0; | |
205 | pllbuf[3] = 0; | |
206 | pllbuf[3] = 0; | |
207 | pllbuf[4] = 0; | |
e994b8d9 | 208 | } |
780dfef3 | 209 | |
8dec0732 AQ |
210 | // there is no call to _just_ start decoding, so we send the pllbuf anyway |
211 | // even if there isn't a PLL attached to the secondary bus | |
212 | zl10353_write(fe, pllbuf, sizeof(pllbuf)); | |
213 | ||
fc3398d8 | 214 | zl10353_single_write(fe, 0x5F, 0x13); |
780dfef3 CP |
215 | zl10353_single_write(fe, 0x70, 0x01); |
216 | udelay(250); | |
217 | zl10353_single_write(fe, 0xE4, 0x00); | |
218 | zl10353_single_write(fe, 0xE5, 0x2A); | |
219 | zl10353_single_write(fe, 0xE9, 0x02); | |
220 | zl10353_single_write(fe, 0xE7, 0x40); | |
221 | zl10353_single_write(fe, 0xE8, 0x10); | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | static int zl10353_read_status(struct dvb_frontend *fe, fe_status_t *status) | |
227 | { | |
228 | struct zl10353_state *state = fe->demodulator_priv; | |
229 | int s6, s7, s8; | |
230 | ||
231 | if ((s6 = zl10353_read_register(state, STATUS_6)) < 0) | |
232 | return -EREMOTEIO; | |
233 | if ((s7 = zl10353_read_register(state, STATUS_7)) < 0) | |
234 | return -EREMOTEIO; | |
235 | if ((s8 = zl10353_read_register(state, STATUS_8)) < 0) | |
236 | return -EREMOTEIO; | |
237 | ||
238 | *status = 0; | |
239 | if (s6 & (1 << 2)) | |
240 | *status |= FE_HAS_CARRIER; | |
241 | if (s6 & (1 << 1)) | |
242 | *status |= FE_HAS_VITERBI; | |
243 | if (s6 & (1 << 5)) | |
244 | *status |= FE_HAS_LOCK; | |
245 | if (s7 & (1 << 4)) | |
246 | *status |= FE_HAS_SYNC; | |
247 | if (s8 & (1 << 6)) | |
248 | *status |= FE_HAS_SIGNAL; | |
249 | ||
250 | if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) != | |
251 | (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) | |
252 | *status &= ~FE_HAS_LOCK; | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
67b60aad CP |
257 | static int zl10353_read_ber(struct dvb_frontend *fe, u32 *ber) |
258 | { | |
259 | struct zl10353_state *state = fe->demodulator_priv; | |
260 | ||
6345f0f6 CP |
261 | *ber = zl10353_read_register(state, RS_ERR_CNT_2) << 16 | |
262 | zl10353_read_register(state, RS_ERR_CNT_1) << 8 | | |
263 | zl10353_read_register(state, RS_ERR_CNT_0); | |
67b60aad CP |
264 | |
265 | return 0; | |
266 | } | |
267 | ||
268 | static int zl10353_read_signal_strength(struct dvb_frontend *fe, u16 *strength) | |
269 | { | |
270 | struct zl10353_state *state = fe->demodulator_priv; | |
271 | ||
6345f0f6 CP |
272 | u16 signal = zl10353_read_register(state, AGC_GAIN_1) << 10 | |
273 | zl10353_read_register(state, AGC_GAIN_0) << 2 | 3; | |
67b60aad CP |
274 | |
275 | *strength = ~signal; | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
780dfef3 CP |
280 | static int zl10353_read_snr(struct dvb_frontend *fe, u16 *snr) |
281 | { | |
282 | struct zl10353_state *state = fe->demodulator_priv; | |
283 | u8 _snr; | |
284 | ||
285 | if (debug_regs) | |
286 | zl10353_dump_regs(fe); | |
287 | ||
288 | _snr = zl10353_read_register(state, SNR); | |
289 | *snr = (_snr << 8) | _snr; | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
67b60aad CP |
294 | static int zl10353_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks) |
295 | { | |
296 | struct zl10353_state *state = fe->demodulator_priv; | |
297 | ||
6345f0f6 CP |
298 | *ucblocks = zl10353_read_register(state, RS_UBC_1) << 8 | |
299 | zl10353_read_register(state, RS_UBC_0); | |
67b60aad CP |
300 | |
301 | return 0; | |
302 | } | |
303 | ||
780dfef3 CP |
304 | static int zl10353_get_tune_settings(struct dvb_frontend *fe, |
305 | struct dvb_frontend_tune_settings | |
306 | *fe_tune_settings) | |
307 | { | |
308 | fe_tune_settings->min_delay_ms = 1000; | |
309 | fe_tune_settings->step_size = 0; | |
310 | fe_tune_settings->max_drift = 0; | |
311 | ||
312 | return 0; | |
313 | } | |
314 | ||
315 | static int zl10353_init(struct dvb_frontend *fe) | |
316 | { | |
317 | struct zl10353_state *state = fe->demodulator_priv; | |
318 | u8 zl10353_reset_attach[6] = { 0x50, 0x03, 0x64, 0x46, 0x15, 0x0F }; | |
319 | int rc = 0; | |
320 | ||
321 | if (debug_regs) | |
322 | zl10353_dump_regs(fe); | |
8fb95784 CP |
323 | if (state->config.parallel_ts) |
324 | zl10353_reset_attach[2] &= ~0x20; | |
780dfef3 CP |
325 | |
326 | /* Do a "hard" reset if not already done */ | |
8fb95784 CP |
327 | if (zl10353_read_register(state, 0x50) != zl10353_reset_attach[1] || |
328 | zl10353_read_register(state, 0x51) != zl10353_reset_attach[2]) { | |
780dfef3 CP |
329 | rc = zl10353_write(fe, zl10353_reset_attach, |
330 | sizeof(zl10353_reset_attach)); | |
331 | if (debug_regs) | |
332 | zl10353_dump_regs(fe); | |
333 | } | |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
0a11bb86 AP |
338 | static int zl10353_i2c_gate_ctrl(struct dvb_frontend* fe, int enable) |
339 | { | |
340 | u8 val = 0x0a; | |
341 | ||
342 | if (enable) | |
343 | val |= 0x10; | |
344 | ||
345 | return zl10353_single_write(fe, 0x62, val); | |
346 | } | |
347 | ||
780dfef3 CP |
348 | static void zl10353_release(struct dvb_frontend *fe) |
349 | { | |
350 | struct zl10353_state *state = fe->demodulator_priv; | |
780dfef3 CP |
351 | kfree(state); |
352 | } | |
353 | ||
354 | static struct dvb_frontend_ops zl10353_ops; | |
355 | ||
356 | struct dvb_frontend *zl10353_attach(const struct zl10353_config *config, | |
357 | struct i2c_adapter *i2c) | |
358 | { | |
359 | struct zl10353_state *state = NULL; | |
360 | ||
361 | /* allocate memory for the internal state */ | |
362 | state = kzalloc(sizeof(struct zl10353_state), GFP_KERNEL); | |
363 | if (state == NULL) | |
364 | goto error; | |
365 | ||
366 | /* setup the state */ | |
367 | state->i2c = i2c; | |
368 | memcpy(&state->config, config, sizeof(struct zl10353_config)); | |
780dfef3 CP |
369 | |
370 | /* check if the demod is there */ | |
371 | if (zl10353_read_register(state, CHIP_ID) != ID_ZL10353) | |
372 | goto error; | |
373 | ||
374 | /* create dvb_frontend */ | |
dea74869 | 375 | memcpy(&state->frontend.ops, &zl10353_ops, sizeof(struct dvb_frontend_ops)); |
780dfef3 CP |
376 | state->frontend.demodulator_priv = state; |
377 | ||
378 | return &state->frontend; | |
379 | error: | |
380 | kfree(state); | |
381 | return NULL; | |
382 | } | |
383 | ||
384 | static struct dvb_frontend_ops zl10353_ops = { | |
385 | ||
386 | .info = { | |
387 | .name = "Zarlink ZL10353 DVB-T", | |
388 | .type = FE_OFDM, | |
389 | .frequency_min = 174000000, | |
390 | .frequency_max = 862000000, | |
391 | .frequency_stepsize = 166667, | |
392 | .frequency_tolerance = 0, | |
393 | .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | | |
394 | FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | | |
395 | FE_CAN_FEC_AUTO | | |
396 | FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO | | |
397 | FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO | | |
398 | FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER | | |
399 | FE_CAN_MUTE_TS | |
400 | }, | |
401 | ||
402 | .release = zl10353_release, | |
403 | ||
404 | .init = zl10353_init, | |
405 | .sleep = zl10353_sleep, | |
0a11bb86 | 406 | .i2c_gate_ctrl = zl10353_i2c_gate_ctrl, |
c10d14d6 | 407 | .write = zl10353_write, |
780dfef3 CP |
408 | |
409 | .set_frontend = zl10353_set_parameters, | |
410 | .get_tune_settings = zl10353_get_tune_settings, | |
411 | ||
412 | .read_status = zl10353_read_status, | |
67b60aad CP |
413 | .read_ber = zl10353_read_ber, |
414 | .read_signal_strength = zl10353_read_signal_strength, | |
780dfef3 | 415 | .read_snr = zl10353_read_snr, |
67b60aad | 416 | .read_ucblocks = zl10353_read_ucblocks, |
780dfef3 CP |
417 | }; |
418 | ||
f7f57770 AP |
419 | module_param(debug, int, 0644); |
420 | MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); | |
421 | ||
780dfef3 CP |
422 | module_param(debug_regs, int, 0644); |
423 | MODULE_PARM_DESC(debug_regs, "Turn on/off frontend register dumps (default:off)."); | |
424 | ||
425 | MODULE_DESCRIPTION("Zarlink ZL10353 DVB-T demodulator driver"); | |
426 | MODULE_AUTHOR("Chris Pascoe"); | |
427 | MODULE_LICENSE("GPL"); | |
428 | ||
429 | EXPORT_SYMBOL(zl10353_attach); |