1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Samsung s5h1432 DVB-T demodulator driver
4 *
5 * Copyright (C) 2009 Bill Liu <Bill.Liu@Conexant.com>
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/module.h>
11 #include <linux/string.h>
12 #include <linux/slab.h>
13 #include <linux/delay.h>
14 #include <media/dvb_frontend.h>
15 #include "s5h1432.h"
16
17 struct s5h1432_state {
18
19 struct i2c_adapter *i2c;
20
21 /* configuration settings */
22 const struct s5h1432_config *config;
23
24 struct dvb_frontend frontend;
25
26 enum fe_modulation current_modulation;
27 unsigned int first_tune:1;
28
29 u32 current_frequency;
30 int if_freq;
31
32 u8 inversion;
33 };
34
35 static int debug;
36
37 #define dprintk(arg...) do { \
38 if (debug) \
39 printk(arg); \
40 } while (0)
41
s5h1432_writereg(struct s5h1432_state * state,u8 addr,u8 reg,u8 data)42 static int s5h1432_writereg(struct s5h1432_state *state,
43 u8 addr, u8 reg, u8 data)
44 {
45 int ret;
46 u8 buf[] = { reg, data };
47
48 struct i2c_msg msg = {.addr = addr, .flags = 0, .buf = buf, .len = 2 };
49
50 ret = i2c_transfer(state->i2c, &msg, 1);
51
52 if (ret != 1)
53 printk(KERN_ERR "%s: writereg error 0x%02x 0x%02x 0x%04x, ret == %i)\n",
54 __func__, addr, reg, data, ret);
55
56 return (ret != 1) ? -1 : 0;
57 }
58
s5h1432_readreg(struct s5h1432_state * state,u8 addr,u8 reg)59 static u8 s5h1432_readreg(struct s5h1432_state *state, u8 addr, u8 reg)
60 {
61 int ret;
62 u8 b0[] = { reg };
63 u8 b1[] = { 0 };
64
65 struct i2c_msg msg[] = {
66 {.addr = addr, .flags = 0, .buf = b0, .len = 1},
67 {.addr = addr, .flags = I2C_M_RD, .buf = b1, .len = 1}
68 };
69
70 ret = i2c_transfer(state->i2c, msg, 2);
71
72 if (ret != 2)
73 printk(KERN_ERR "%s: readreg error (ret == %i)\n",
74 __func__, ret);
75 return b1[0];
76 }
77
s5h1432_sleep(struct dvb_frontend * fe)78 static int s5h1432_sleep(struct dvb_frontend *fe)
79 {
80 return 0;
81 }
82
s5h1432_set_channel_bandwidth(struct dvb_frontend * fe,u32 bandwidth)83 static int s5h1432_set_channel_bandwidth(struct dvb_frontend *fe,
84 u32 bandwidth)
85 {
86 struct s5h1432_state *state = fe->demodulator_priv;
87
88 u8 reg = 0;
89
90 /* Register [0x2E] bit 3:2 : 8MHz = 0; 7MHz = 1; 6MHz = 2 */
91 reg = s5h1432_readreg(state, S5H1432_I2C_TOP_ADDR, 0x2E);
92 reg &= ~(0x0C);
93 switch (bandwidth) {
94 case 6:
95 reg |= 0x08;
96 break;
97 case 7:
98 reg |= 0x04;
99 break;
100 case 8:
101 reg |= 0x00;
102 break;
103 default:
104 return 0;
105 }
106 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x2E, reg);
107 return 1;
108 }
109
s5h1432_set_IF(struct dvb_frontend * fe,u32 ifFreqHz)110 static int s5h1432_set_IF(struct dvb_frontend *fe, u32 ifFreqHz)
111 {
112 struct s5h1432_state *state = fe->demodulator_priv;
113
114 switch (ifFreqHz) {
115 case TAIWAN_HI_IF_FREQ_44_MHZ:
116 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x55);
117 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x55);
118 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0x15);
119 break;
120 case EUROPE_HI_IF_FREQ_36_MHZ:
121 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x00);
122 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x00);
123 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0x40);
124 break;
125 case IF_FREQ_6_MHZ:
126 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x00);
127 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x00);
128 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xe0);
129 break;
130 case IF_FREQ_3point3_MHZ:
131 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x66);
132 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x66);
133 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xEE);
134 break;
135 case IF_FREQ_3point5_MHZ:
136 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x55);
137 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x55);
138 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xED);
139 break;
140 case IF_FREQ_4_MHZ:
141 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0xAA);
142 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0xAA);
143 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xEA);
144 break;
145 default:
146 {
147 u32 value = 0;
148 value = (u32) (((48000 - (ifFreqHz / 1000)) * 512 *
149 (u32) 32768) / (48 * 1000));
150 printk(KERN_INFO
151 "Default IFFreq %d :reg value = 0x%x\n",
152 ifFreqHz, value);
153 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4,
154 (u8) value & 0xFF);
155 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5,
156 (u8) (value >> 8) & 0xFF);
157 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7,
158 (u8) (value >> 16) & 0xFF);
159 break;
160 }
161
162 }
163
164 return 1;
165 }
166
167 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
s5h1432_set_frontend(struct dvb_frontend * fe)168 static int s5h1432_set_frontend(struct dvb_frontend *fe)
169 {
170 struct dtv_frontend_properties *p = &fe->dtv_property_cache;
171 u32 dvb_bandwidth = 8;
172 struct s5h1432_state *state = fe->demodulator_priv;
173
174 if (p->frequency == state->current_frequency) {
175 /*current_frequency = p->frequency; */
176 /*state->current_frequency = p->frequency; */
177 } else {
178 fe->ops.tuner_ops.set_params(fe);
179 msleep(300);
180 s5h1432_set_channel_bandwidth(fe, dvb_bandwidth);
181 switch (p->bandwidth_hz) {
182 case 6000000:
183 dvb_bandwidth = 6;
184 s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
185 break;
186 case 7000000:
187 dvb_bandwidth = 7;
188 s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
189 break;
190 case 8000000:
191 dvb_bandwidth = 8;
192 s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
193 break;
194 default:
195 return 0;
196 }
197 /*fe->ops.tuner_ops.set_params(fe); */
198 /*Soft Reset chip*/
199 msleep(30);
200 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1a);
201 msleep(30);
202 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1b);
203
204 s5h1432_set_channel_bandwidth(fe, dvb_bandwidth);
205 switch (p->bandwidth_hz) {
206 case 6000000:
207 dvb_bandwidth = 6;
208 s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
209 break;
210 case 7000000:
211 dvb_bandwidth = 7;
212 s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
213 break;
214 case 8000000:
215 dvb_bandwidth = 8;
216 s5h1432_set_IF(fe, IF_FREQ_4_MHZ);
217 break;
218 default:
219 return 0;
220 }
221 /*fe->ops.tuner_ops.set_params(fe); */
222 /*Soft Reset chip*/
223 msleep(30);
224 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1a);
225 msleep(30);
226 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1b);
227
228 }
229
230 state->current_frequency = p->frequency;
231
232 return 0;
233 }
234
s5h1432_init(struct dvb_frontend * fe)235 static int s5h1432_init(struct dvb_frontend *fe)
236 {
237 struct s5h1432_state *state = fe->demodulator_priv;
238
239 u8 reg = 0;
240 state->current_frequency = 0;
241 printk(KERN_INFO " s5h1432_init().\n");
242
243 /*Set VSB mode as default, this also does a soft reset */
244 /*Initialize registers */
245
246 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x04, 0xa8);
247 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x05, 0x01);
248 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x07, 0x70);
249 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x19, 0x80);
250 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1b, 0x9D);
251 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1c, 0x30);
252 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1d, 0x20);
253 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1e, 0x1B);
254 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x2e, 0x40);
255 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x42, 0x84);
256 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x50, 0x5a);
257 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x5a, 0xd3);
258 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x68, 0x50);
259 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xb8, 0x3c);
260 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xc4, 0x10);
261 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xcc, 0x9c);
262 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xDA, 0x00);
263 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe1, 0x94);
264 /* s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xf4, 0xa1); */
265 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xf9, 0x00);
266
267 /*For NXP tuner*/
268
269 /*Set 3.3MHz as default IF frequency */
270 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe4, 0x66);
271 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe5, 0x66);
272 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0xe7, 0xEE);
273 /* Set reg 0x1E to get the full dynamic range */
274 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x1e, 0x31);
275
276 /* Mode setting in demod */
277 reg = s5h1432_readreg(state, S5H1432_I2C_TOP_ADDR, 0x42);
278 reg |= 0x80;
279 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x42, reg);
280 /* Serial mode */
281
282 /* Soft Reset chip */
283
284 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1a);
285 msleep(30);
286 s5h1432_writereg(state, S5H1432_I2C_TOP_ADDR, 0x09, 0x1b);
287
288
289 return 0;
290 }
291
s5h1432_read_status(struct dvb_frontend * fe,enum fe_status * status)292 static int s5h1432_read_status(struct dvb_frontend *fe, enum fe_status *status)
293 {
294 return 0;
295 }
296
s5h1432_read_signal_strength(struct dvb_frontend * fe,u16 * signal_strength)297 static int s5h1432_read_signal_strength(struct dvb_frontend *fe,
298 u16 *signal_strength)
299 {
300 return 0;
301 }
302
s5h1432_read_snr(struct dvb_frontend * fe,u16 * snr)303 static int s5h1432_read_snr(struct dvb_frontend *fe, u16 *snr)
304 {
305 return 0;
306 }
307
s5h1432_read_ucblocks(struct dvb_frontend * fe,u32 * ucblocks)308 static int s5h1432_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
309 {
310
311 return 0;
312 }
313
s5h1432_read_ber(struct dvb_frontend * fe,u32 * ber)314 static int s5h1432_read_ber(struct dvb_frontend *fe, u32 *ber)
315 {
316 return 0;
317 }
318
s5h1432_get_tune_settings(struct dvb_frontend * fe,struct dvb_frontend_tune_settings * tune)319 static int s5h1432_get_tune_settings(struct dvb_frontend *fe,
320 struct dvb_frontend_tune_settings *tune)
321 {
322 return 0;
323 }
324
s5h1432_release(struct dvb_frontend * fe)325 static void s5h1432_release(struct dvb_frontend *fe)
326 {
327 struct s5h1432_state *state = fe->demodulator_priv;
328 kfree(state);
329 }
330
331 static const struct dvb_frontend_ops s5h1432_ops;
332
s5h1432_attach(const struct s5h1432_config * config,struct i2c_adapter * i2c)333 struct dvb_frontend *s5h1432_attach(const struct s5h1432_config *config,
334 struct i2c_adapter *i2c)
335 {
336 struct s5h1432_state *state = NULL;
337
338 printk(KERN_INFO " Enter s5h1432_attach(). attach success!\n");
339 /* allocate memory for the internal state */
340 state = kmalloc(sizeof(struct s5h1432_state), GFP_KERNEL);
341 if (!state)
342 return NULL;
343
344 /* setup the state */
345 state->config = config;
346 state->i2c = i2c;
347 state->current_modulation = QAM_16;
348 state->inversion = state->config->inversion;
349
350 /* create dvb_frontend */
351 memcpy(&state->frontend.ops, &s5h1432_ops,
352 sizeof(struct dvb_frontend_ops));
353
354 state->frontend.demodulator_priv = state;
355
356 return &state->frontend;
357 }
358 EXPORT_SYMBOL_GPL(s5h1432_attach);
359
360 static const struct dvb_frontend_ops s5h1432_ops = {
361 .delsys = { SYS_DVBT },
362 .info = {
363 .name = "Samsung s5h1432 DVB-T Frontend",
364 .frequency_min_hz = 177 * MHz,
365 .frequency_max_hz = 858 * MHz,
366 .frequency_stepsize_hz = 166666,
367 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
368 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
369 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
370 FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
371 FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER},
372
373 .init = s5h1432_init,
374 .sleep = s5h1432_sleep,
375 .set_frontend = s5h1432_set_frontend,
376 .get_tune_settings = s5h1432_get_tune_settings,
377 .read_status = s5h1432_read_status,
378 .read_ber = s5h1432_read_ber,
379 .read_signal_strength = s5h1432_read_signal_strength,
380 .read_snr = s5h1432_read_snr,
381 .read_ucblocks = s5h1432_read_ucblocks,
382 .release = s5h1432_release,
383 };
384
385 module_param(debug, int, 0644);
386 MODULE_PARM_DESC(debug, "Enable verbose debug messages");
387
388 MODULE_DESCRIPTION("Samsung s5h1432 DVB-T Demodulator driver");
389 MODULE_AUTHOR("Bill Liu");
390 MODULE_LICENSE("GPL");
391