1 // SPDX-License-Identifier: GPL-2.0-only
3 * Sharp VA3A5JZ921 One Seg Broadcast Module driver
4 * This device is labeled as just S. 921 at the top of the frontend can
6 * Copyright (C) 2009-2010 Mauro Carvalho Chehab
9 * Developed for Leadership SBTVD 1seg device sold in Brazil
11 * Frontend module based on cx24123 driver, getting some info from
12 * the old s921 driver.
14 * FIXME: Need to port to DVB v5.2 API
17 #include <linux/kernel.h>
18 #include <asm/div64.h>
20 #include <media/dvb_frontend.h>
24 module_param(debug, int, 0644);
25 MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)");
27 #define rc(args...) do { \
28 printk(KERN_ERR "s921: " args); \
31 #define dprintk(args...) \
34 printk(KERN_DEBUG "s921: %s: ", __func__); \
40 struct i2c_adapter *i2c;
41 const struct s921_config *config;
43 struct dvb_frontend frontend;
45 /* The Demod can't easily provide these, we cache them */
50 * Various tuner defaults need to be established for a given frequency kHz.
51 * fixme: The bounds on the bands do not match the doc in real life.
52 * fixme: Some of them have been moved, other might need adjustment.
54 static struct s921_bandselect_val {
57 } s921_bandselect[] = {
73 static struct regdata s921_init[] = {
74 { 0x01, 0x80 }, /* Probably, a reset sequence */
181 static struct regdata s921_prefreq[] = {
189 static struct regdata s921_postfreq[] = {
198 static int s921_i2c_writereg(struct s921_state *state,
199 u8 i2c_addr, int reg, int data)
201 u8 buf[] = { reg, data };
202 struct i2c_msg msg = {
203 .addr = i2c_addr, .flags = 0, .buf = buf, .len = 2
207 rc = i2c_transfer(state->i2c, &msg, 1);
209 printk("%s: writereg rcor(rc == %i, reg == 0x%02x, data == 0x%02x)\n",
210 __func__, rc, reg, data);
217 static int s921_i2c_writeregdata(struct s921_state *state, u8 i2c_addr,
218 struct regdata *rd, int size)
222 for (i = 0; i < size; i++) {
223 rc = s921_i2c_writereg(state, i2c_addr, rd[i].reg, rd[i].data);
230 static int s921_i2c_readreg(struct s921_state *state, u8 i2c_addr, u8 reg)
234 struct i2c_msg msg[] = {
235 { .addr = i2c_addr, .flags = 0, .buf = ®, .len = 1 },
236 { .addr = i2c_addr, .flags = I2C_M_RD, .buf = &val, .len = 1 }
239 rc = i2c_transfer(state->i2c, msg, 2);
242 rc("%s: reg=0x%x (rcor=%d)\n", __func__, reg, rc);
249 #define s921_readreg(state, reg) \
250 s921_i2c_readreg(state, state->config->demod_address, reg)
251 #define s921_writereg(state, reg, val) \
252 s921_i2c_writereg(state, state->config->demod_address, reg, val)
253 #define s921_writeregdata(state, regdata) \
254 s921_i2c_writeregdata(state, state->config->demod_address, \
255 regdata, ARRAY_SIZE(regdata))
257 static int s921_pll_tune(struct dvb_frontend *fe)
259 struct dtv_frontend_properties *p = &fe->dtv_property_cache;
260 struct s921_state *state = fe->demodulator_priv;
262 unsigned long f_offset;
266 dprintk("frequency=%i\n", p->frequency);
268 for (band = 0; band < ARRAY_SIZE(s921_bandselect); band++)
269 if (p->frequency < s921_bandselect[band].freq_low)
274 rc("%s: frequency out of range\n", __func__);
278 f_switch = s921_bandselect[band].band_reg;
280 offset = ((u64)p->frequency) * 258;
281 do_div(offset, 6000000);
282 f_offset = ((unsigned long)offset) + 2321;
284 rc = s921_writeregdata(state, s921_prefreq);
288 rc = s921_writereg(state, 0xf2, (f_offset >> 8) & 0xff);
292 rc = s921_writereg(state, 0xf3, f_offset & 0xff);
296 rc = s921_writereg(state, 0xf4, f_switch);
300 rc = s921_writeregdata(state, s921_postfreq);
304 for (i = 0 ; i < 6; i++) {
305 rc = s921_readreg(state, 0x80);
306 dprintk("status 0x80: %02x\n", rc);
308 rc = s921_writereg(state, 0x01, 0x40);
312 rc = s921_readreg(state, 0x01);
313 dprintk("status 0x01: %02x\n", rc);
315 rc = s921_readreg(state, 0x80);
316 dprintk("status 0x80: %02x\n", rc);
318 rc = s921_readreg(state, 0x80);
319 dprintk("status 0x80: %02x\n", rc);
321 rc = s921_readreg(state, 0x32);
322 dprintk("status 0x32: %02x\n", rc);
324 dprintk("pll tune band=%d, pll=%d\n", f_switch, (int)f_offset);
329 static int s921_initfe(struct dvb_frontend *fe)
331 struct s921_state *state = fe->demodulator_priv;
336 rc = s921_writeregdata(state, s921_init);
343 static int s921_read_status(struct dvb_frontend *fe, enum fe_status *status)
345 struct s921_state *state = fe->demodulator_priv;
350 rc = s921_readreg(state, 0x81);
356 rc = s921_readreg(state, 0x82);
362 dprintk("status = %04x\n", regstatus);
364 /* Full Sync - We don't know what each bit means on regs 0x81/0x82 */
365 if ((regstatus & 0xff) == 0x40) {
366 *status = FE_HAS_SIGNAL |
371 } else if (regstatus & 0x40) {
372 /* This is close to Full Sync, but not enough to get useful info */
373 *status = FE_HAS_SIGNAL |
382 static int s921_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
384 enum fe_status status;
385 struct s921_state *state = fe->demodulator_priv;
388 /* FIXME: Use the proper register for it... 0x80? */
389 rc = s921_read_status(fe, &status);
393 *strength = (status & FE_HAS_LOCK) ? 0xffff : 0;
395 dprintk("strength = 0x%04x\n", *strength);
397 rc = s921_readreg(state, 0x01);
398 dprintk("status 0x01: %02x\n", rc);
400 rc = s921_readreg(state, 0x80);
401 dprintk("status 0x80: %02x\n", rc);
403 rc = s921_readreg(state, 0x32);
404 dprintk("status 0x32: %02x\n", rc);
409 static int s921_set_frontend(struct dvb_frontend *fe)
411 struct dtv_frontend_properties *p = &fe->dtv_property_cache;
412 struct s921_state *state = fe->demodulator_priv;
417 /* FIXME: We don't know how to use non-auto mode */
419 rc = s921_pll_tune(fe);
423 state->currentfreq = p->frequency;
428 static int s921_get_frontend(struct dvb_frontend *fe,
429 struct dtv_frontend_properties *p)
431 struct s921_state *state = fe->demodulator_priv;
433 /* FIXME: Probably it is possible to get it from regs f1 and f2 */
434 p->frequency = state->currentfreq;
435 p->delivery_system = SYS_ISDBT;
440 static int s921_tune(struct dvb_frontend *fe,
442 unsigned int mode_flags,
444 enum fe_status *status)
451 rc = s921_set_frontend(fe);
453 if (!(mode_flags & FE_TUNE_MODE_ONESHOT))
454 s921_read_status(fe, status);
459 static enum dvbfe_algo s921_get_algo(struct dvb_frontend *fe)
461 return DVBFE_ALGO_HW;
464 static void s921_release(struct dvb_frontend *fe)
466 struct s921_state *state = fe->demodulator_priv;
472 static const struct dvb_frontend_ops s921_ops;
474 struct dvb_frontend *s921_attach(const struct s921_config *config,
475 struct i2c_adapter *i2c)
477 /* allocate memory for the internal state */
478 struct s921_state *state =
479 kzalloc(sizeof(struct s921_state), GFP_KERNEL);
483 rc("Unable to kzalloc\n");
487 /* setup the state */
488 state->config = config;
491 /* create dvb_frontend */
492 memcpy(&state->frontend.ops, &s921_ops,
493 sizeof(struct dvb_frontend_ops));
494 state->frontend.demodulator_priv = state;
496 return &state->frontend;
498 EXPORT_SYMBOL(s921_attach);
500 static const struct dvb_frontend_ops s921_ops = {
501 .delsys = { SYS_ISDBT },
502 /* Use dib8000 values per default */
504 .name = "Sharp S921",
505 .frequency_min_hz = 470 * MHz,
507 * Max should be 770MHz instead, according with Sharp docs,
508 * but Leadership doc says it works up to 806 MHz. This is
509 * required to get channel 69, used in Brazil
511 .frequency_max_hz = 806 * MHz,
512 .caps = FE_CAN_INVERSION_AUTO |
513 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
514 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
515 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
516 FE_CAN_QAM_AUTO | FE_CAN_TRANSMISSION_MODE_AUTO |
517 FE_CAN_GUARD_INTERVAL_AUTO | FE_CAN_RECOVER |
518 FE_CAN_HIERARCHY_AUTO,
521 .release = s921_release,
524 .set_frontend = s921_set_frontend,
525 .get_frontend = s921_get_frontend,
526 .read_status = s921_read_status,
527 .read_signal_strength = s921_read_signal_strength,
529 .get_frontend_algo = s921_get_algo,
532 MODULE_DESCRIPTION("DVB Frontend module for Sharp S921 hardware");
533 MODULE_AUTHOR("Mauro Carvalho Chehab");
535 MODULE_LICENSE("GPL");