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dfbdce04 TL |
1 | /* |
2 | Legend Silicon LGS-8GL5 DMB-TH OFDM demodulator driver | |
3 | ||
4 | Copyright (C) 2008 Sirius International (Hong Kong) Limited | |
5 | Timothy Lee <timothy.lee@siriushk.com> | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
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 | ||
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 "lgs8gl5.h" | |
30 | ||
31 | ||
32 | #define REG_RESET 0x02 | |
33 | #define REG_RESET_OFF 0x01 | |
34 | #define REG_03 0x03 | |
35 | #define REG_04 0x04 | |
36 | #define REG_07 0x07 | |
37 | #define REG_09 0x09 | |
38 | #define REG_0A 0x0a | |
39 | #define REG_0B 0x0b | |
40 | #define REG_0C 0x0c | |
41 | #define REG_37 0x37 | |
42 | #define REG_STRENGTH 0x4b | |
43 | #define REG_STRENGTH_MASK 0x7f | |
44 | #define REG_STRENGTH_CARRIER 0x80 | |
45 | #define REG_INVERSION 0x7c | |
46 | #define REG_INVERSION_ON 0x80 | |
47 | #define REG_7D 0x7d | |
48 | #define REG_7E 0x7e | |
49 | #define REG_A2 0xa2 | |
50 | #define REG_STATUS 0xa4 | |
51 | #define REG_STATUS_SYNC 0x04 | |
52 | #define REG_STATUS_LOCK 0x01 | |
53 | ||
54 | ||
55 | struct lgs8gl5_state { | |
56 | struct i2c_adapter *i2c; | |
57 | const struct lgs8gl5_config *config; | |
58 | struct dvb_frontend frontend; | |
59 | }; | |
60 | ||
61 | ||
62 | static int debug; | |
63 | #define dprintk(args...) \ | |
64 | do { \ | |
65 | if (debug) \ | |
66 | printk(KERN_DEBUG "lgs8gl5: " args); \ | |
67 | } while (0) | |
68 | ||
69 | ||
70 | /* Writes into demod's register */ | |
71 | static int | |
72 | lgs8gl5_write_reg(struct lgs8gl5_state *state, u8 reg, u8 data) | |
73 | { | |
74 | int ret; | |
75 | u8 buf[] = {reg, data}; | |
76 | struct i2c_msg msg = { | |
77 | .addr = state->config->demod_address, | |
78 | .flags = 0, | |
79 | .buf = buf, | |
80 | .len = 2 | |
81 | }; | |
82 | ||
83 | ret = i2c_transfer(state->i2c, &msg, 1); | |
84 | if (ret != 1) | |
85 | dprintk("%s: error (reg=0x%02x, val=0x%02x, ret=%i)\n", | |
86 | __func__, reg, data, ret); | |
87 | return (ret != 1) ? -1 : 0; | |
88 | } | |
89 | ||
90 | ||
91 | /* Reads from demod's register */ | |
92 | static int | |
93 | lgs8gl5_read_reg(struct lgs8gl5_state *state, u8 reg) | |
94 | { | |
3a6b974d | 95 | int ret; |
dfbdce04 TL |
96 | u8 b0[] = {reg}; |
97 | u8 b1[] = {0}; | |
98 | struct i2c_msg msg[2] = { | |
99 | { | |
100 | .addr = state->config->demod_address, | |
101 | .flags = 0, | |
102 | .buf = b0, | |
103 | .len = 1 | |
104 | }, | |
105 | { | |
106 | .addr = state->config->demod_address, | |
107 | .flags = I2C_M_RD, | |
108 | .buf = b1, | |
109 | .len = 1 | |
110 | } | |
111 | }; | |
112 | ||
113 | ret = i2c_transfer(state->i2c, msg, 2); | |
114 | if (ret != 2) | |
115 | return -EIO; | |
116 | ||
117 | return b1[0]; | |
118 | } | |
119 | ||
120 | ||
121 | static int | |
122 | lgs8gl5_update_reg(struct lgs8gl5_state *state, u8 reg, u8 data) | |
123 | { | |
124 | lgs8gl5_read_reg(state, reg); | |
125 | lgs8gl5_write_reg(state, reg, data); | |
126 | return 0; | |
127 | } | |
128 | ||
129 | ||
130 | /* Writes into alternate device's register */ | |
131 | /* TODO: Find out what that device is for! */ | |
132 | static int | |
133 | lgs8gl5_update_alt_reg(struct lgs8gl5_state *state, u8 reg, u8 data) | |
134 | { | |
3a6b974d | 135 | int ret; |
dfbdce04 TL |
136 | u8 b0[] = {reg}; |
137 | u8 b1[] = {0}; | |
138 | u8 b2[] = {reg, data}; | |
139 | struct i2c_msg msg[3] = { | |
140 | { | |
141 | .addr = state->config->demod_address + 2, | |
142 | .flags = 0, | |
143 | .buf = b0, | |
144 | .len = 1 | |
145 | }, | |
146 | { | |
147 | .addr = state->config->demod_address + 2, | |
148 | .flags = I2C_M_RD, | |
149 | .buf = b1, | |
150 | .len = 1 | |
151 | }, | |
152 | { | |
153 | .addr = state->config->demod_address + 2, | |
154 | .flags = 0, | |
155 | .buf = b2, | |
156 | .len = 2 | |
157 | }, | |
158 | }; | |
159 | ||
160 | ret = i2c_transfer(state->i2c, msg, 3); | |
161 | return (ret != 3) ? -1 : 0; | |
162 | } | |
163 | ||
164 | ||
165 | static void | |
166 | lgs8gl5_soft_reset(struct lgs8gl5_state *state) | |
167 | { | |
168 | u8 val; | |
169 | ||
170 | dprintk("%s\n", __func__); | |
171 | ||
172 | val = lgs8gl5_read_reg(state, REG_RESET); | |
173 | lgs8gl5_write_reg(state, REG_RESET, val & ~REG_RESET_OFF); | |
174 | lgs8gl5_write_reg(state, REG_RESET, val | REG_RESET_OFF); | |
175 | msleep(5); | |
176 | } | |
177 | ||
178 | ||
dfbdce04 TL |
179 | /* Starts demodulation */ |
180 | static void | |
181 | lgs8gl5_start_demod(struct lgs8gl5_state *state) | |
182 | { | |
183 | u8 val; | |
184 | int n; | |
185 | ||
186 | dprintk("%s\n", __func__); | |
187 | ||
188 | lgs8gl5_update_alt_reg(state, 0xc2, 0x28); | |
189 | lgs8gl5_soft_reset(state); | |
190 | lgs8gl5_update_reg(state, REG_07, 0x10); | |
191 | lgs8gl5_update_reg(state, REG_07, 0x10); | |
192 | lgs8gl5_write_reg(state, REG_09, 0x0e); | |
193 | lgs8gl5_write_reg(state, REG_0A, 0xe5); | |
194 | lgs8gl5_write_reg(state, REG_0B, 0x35); | |
195 | lgs8gl5_write_reg(state, REG_0C, 0x30); | |
196 | ||
197 | lgs8gl5_update_reg(state, REG_03, 0x00); | |
198 | lgs8gl5_update_reg(state, REG_7E, 0x01); | |
199 | lgs8gl5_update_alt_reg(state, 0xc5, 0x00); | |
200 | lgs8gl5_update_reg(state, REG_04, 0x02); | |
201 | lgs8gl5_update_reg(state, REG_37, 0x01); | |
202 | lgs8gl5_soft_reset(state); | |
203 | ||
204 | /* Wait for carrier */ | |
205 | for (n = 0; n < 10; n++) { | |
206 | val = lgs8gl5_read_reg(state, REG_STRENGTH); | |
207 | dprintk("Wait for carrier[%d] 0x%02X\n", n, val); | |
208 | if (val & REG_STRENGTH_CARRIER) | |
209 | break; | |
210 | msleep(4); | |
211 | } | |
212 | if (!(val & REG_STRENGTH_CARRIER)) | |
213 | return; | |
214 | ||
215 | /* Wait for lock */ | |
216 | for (n = 0; n < 20; n++) { | |
217 | val = lgs8gl5_read_reg(state, REG_STATUS); | |
218 | dprintk("Wait for lock[%d] 0x%02X\n", n, val); | |
219 | if (val & REG_STATUS_LOCK) | |
220 | break; | |
221 | msleep(12); | |
222 | } | |
223 | if (!(val & REG_STATUS_LOCK)) | |
224 | return; | |
225 | ||
226 | lgs8gl5_write_reg(state, REG_7D, lgs8gl5_read_reg(state, REG_A2)); | |
227 | lgs8gl5_soft_reset(state); | |
228 | } | |
229 | ||
230 | ||
231 | static int | |
232 | lgs8gl5_init(struct dvb_frontend *fe) | |
233 | { | |
234 | struct lgs8gl5_state *state = fe->demodulator_priv; | |
235 | ||
236 | dprintk("%s\n", __func__); | |
237 | ||
238 | lgs8gl5_update_alt_reg(state, 0xc2, 0x28); | |
239 | lgs8gl5_soft_reset(state); | |
240 | lgs8gl5_update_reg(state, REG_07, 0x10); | |
241 | lgs8gl5_update_reg(state, REG_07, 0x10); | |
242 | lgs8gl5_write_reg(state, REG_09, 0x0e); | |
243 | lgs8gl5_write_reg(state, REG_0A, 0xe5); | |
244 | lgs8gl5_write_reg(state, REG_0B, 0x35); | |
245 | lgs8gl5_write_reg(state, REG_0C, 0x30); | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
250 | ||
251 | static int | |
0df289a2 | 252 | lgs8gl5_read_status(struct dvb_frontend *fe, enum fe_status *status) |
dfbdce04 TL |
253 | { |
254 | struct lgs8gl5_state *state = fe->demodulator_priv; | |
255 | u8 level = lgs8gl5_read_reg(state, REG_STRENGTH); | |
256 | u8 flags = lgs8gl5_read_reg(state, REG_STATUS); | |
257 | ||
258 | *status = 0; | |
259 | ||
260 | if ((level & REG_STRENGTH_MASK) > 0) | |
261 | *status |= FE_HAS_SIGNAL; | |
262 | if (level & REG_STRENGTH_CARRIER) | |
263 | *status |= FE_HAS_CARRIER; | |
264 | if (flags & REG_STATUS_SYNC) | |
265 | *status |= FE_HAS_SYNC; | |
266 | if (flags & REG_STATUS_LOCK) | |
267 | *status |= FE_HAS_LOCK; | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | ||
273 | static int | |
274 | lgs8gl5_read_ber(struct dvb_frontend *fe, u32 *ber) | |
275 | { | |
dfbdce04 TL |
276 | *ber = 0; |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
281 | ||
282 | static int | |
283 | lgs8gl5_read_signal_strength(struct dvb_frontend *fe, u16 *signal_strength) | |
284 | { | |
285 | struct lgs8gl5_state *state = fe->demodulator_priv; | |
286 | u8 level = lgs8gl5_read_reg(state, REG_STRENGTH); | |
287 | *signal_strength = (level & REG_STRENGTH_MASK) << 8; | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
292 | ||
293 | static int | |
294 | lgs8gl5_read_snr(struct dvb_frontend *fe, u16 *snr) | |
295 | { | |
296 | struct lgs8gl5_state *state = fe->demodulator_priv; | |
297 | u8 level = lgs8gl5_read_reg(state, REG_STRENGTH); | |
298 | *snr = (level & REG_STRENGTH_MASK) << 8; | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | ||
304 | static int | |
305 | lgs8gl5_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks) | |
306 | { | |
dfbdce04 TL |
307 | *ucblocks = 0; |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | ||
313 | static int | |
304577b2 | 314 | lgs8gl5_set_frontend(struct dvb_frontend *fe) |
dfbdce04 | 315 | { |
304577b2 | 316 | struct dtv_frontend_properties *p = &fe->dtv_property_cache; |
dfbdce04 TL |
317 | struct lgs8gl5_state *state = fe->demodulator_priv; |
318 | ||
319 | dprintk("%s\n", __func__); | |
320 | ||
304577b2 | 321 | if (p->bandwidth_hz != 8000000) |
dfbdce04 TL |
322 | return -EINVAL; |
323 | ||
324 | if (fe->ops.tuner_ops.set_params) { | |
14d24d14 | 325 | fe->ops.tuner_ops.set_params(fe); |
dfbdce04 TL |
326 | if (fe->ops.i2c_gate_ctrl) |
327 | fe->ops.i2c_gate_ctrl(fe, 0); | |
328 | } | |
329 | ||
330 | /* lgs8gl5_set_inversion(state, p->inversion); */ | |
331 | ||
332 | lgs8gl5_start_demod(state); | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | ||
338 | static int | |
7e3e68bc MCC |
339 | lgs8gl5_get_frontend(struct dvb_frontend *fe, |
340 | struct dtv_frontend_properties *p) | |
dfbdce04 TL |
341 | { |
342 | struct lgs8gl5_state *state = fe->demodulator_priv; | |
7e3e68bc | 343 | |
dfbdce04 | 344 | u8 inv = lgs8gl5_read_reg(state, REG_INVERSION); |
dfbdce04 TL |
345 | |
346 | p->inversion = (inv & REG_INVERSION_ON) ? INVERSION_ON : INVERSION_OFF; | |
347 | ||
304577b2 MCC |
348 | p->code_rate_HP = FEC_1_2; |
349 | p->code_rate_LP = FEC_7_8; | |
350 | p->guard_interval = GUARD_INTERVAL_1_32; | |
351 | p->transmission_mode = TRANSMISSION_MODE_2K; | |
352 | p->modulation = QAM_64; | |
353 | p->hierarchy = HIERARCHY_NONE; | |
354 | p->bandwidth_hz = 8000000; | |
dfbdce04 TL |
355 | |
356 | return 0; | |
357 | } | |
358 | ||
359 | ||
360 | static int | |
361 | lgs8gl5_get_tune_settings(struct dvb_frontend *fe, | |
362 | struct dvb_frontend_tune_settings *fesettings) | |
363 | { | |
364 | fesettings->min_delay_ms = 240; | |
365 | fesettings->step_size = 0; | |
366 | fesettings->max_drift = 0; | |
367 | return 0; | |
368 | } | |
369 | ||
370 | ||
371 | static void | |
372 | lgs8gl5_release(struct dvb_frontend *fe) | |
373 | { | |
374 | struct lgs8gl5_state *state = fe->demodulator_priv; | |
375 | kfree(state); | |
376 | } | |
377 | ||
378 | ||
bd336e63 | 379 | static const struct dvb_frontend_ops lgs8gl5_ops; |
dfbdce04 TL |
380 | |
381 | ||
382 | struct dvb_frontend* | |
383 | lgs8gl5_attach(const struct lgs8gl5_config *config, struct i2c_adapter *i2c) | |
384 | { | |
385 | struct lgs8gl5_state *state = NULL; | |
386 | ||
387 | dprintk("%s\n", __func__); | |
388 | ||
389 | /* Allocate memory for the internal state */ | |
084e24ac | 390 | state = kzalloc(sizeof(struct lgs8gl5_state), GFP_KERNEL); |
dfbdce04 TL |
391 | if (state == NULL) |
392 | goto error; | |
393 | ||
394 | /* Setup the state */ | |
395 | state->config = config; | |
396 | state->i2c = i2c; | |
397 | ||
398 | /* Check if the demod is there */ | |
399 | if (lgs8gl5_read_reg(state, REG_RESET) < 0) | |
400 | goto error; | |
401 | ||
402 | /* Create dvb_frontend */ | |
403 | memcpy(&state->frontend.ops, &lgs8gl5_ops, | |
404 | sizeof(struct dvb_frontend_ops)); | |
405 | state->frontend.demodulator_priv = state; | |
406 | return &state->frontend; | |
407 | ||
408 | error: | |
409 | kfree(state); | |
410 | return NULL; | |
411 | } | |
412 | EXPORT_SYMBOL(lgs8gl5_attach); | |
413 | ||
414 | ||
bd336e63 | 415 | static const struct dvb_frontend_ops lgs8gl5_ops = { |
224b6642 | 416 | .delsys = { SYS_DTMB }, |
dfbdce04 TL |
417 | .info = { |
418 | .name = "Legend Silicon LGS-8GL5 DMB-TH", | |
dfbdce04 TL |
419 | .frequency_min = 474000000, |
420 | .frequency_max = 858000000, | |
421 | .frequency_stepsize = 10000, | |
422 | .frequency_tolerance = 0, | |
423 | .caps = FE_CAN_FEC_AUTO | | |
424 | FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_32 | | |
425 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO | | |
426 | FE_CAN_TRANSMISSION_MODE_AUTO | | |
427 | FE_CAN_BANDWIDTH_AUTO | | |
428 | FE_CAN_GUARD_INTERVAL_AUTO | | |
429 | FE_CAN_HIERARCHY_AUTO | | |
430 | FE_CAN_RECOVER | |
431 | }, | |
432 | ||
433 | .release = lgs8gl5_release, | |
434 | ||
435 | .init = lgs8gl5_init, | |
436 | ||
304577b2 MCC |
437 | .set_frontend = lgs8gl5_set_frontend, |
438 | .get_frontend = lgs8gl5_get_frontend, | |
dfbdce04 TL |
439 | .get_tune_settings = lgs8gl5_get_tune_settings, |
440 | ||
441 | .read_status = lgs8gl5_read_status, | |
442 | .read_ber = lgs8gl5_read_ber, | |
443 | .read_signal_strength = lgs8gl5_read_signal_strength, | |
444 | .read_snr = lgs8gl5_read_snr, | |
445 | .read_ucblocks = lgs8gl5_read_ucblocks, | |
446 | }; | |
447 | ||
448 | ||
449 | module_param(debug, int, 0644); | |
450 | MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); | |
451 | ||
452 | MODULE_DESCRIPTION("Legend Silicon LGS-8GL5 DMB-TH Demodulator driver"); | |
453 | MODULE_AUTHOR("Timothy Lee"); | |
454 | MODULE_LICENSE("GPL"); |