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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  *   Sharp VA3A5JZ921 One Seg Broadcast Module driver
0004  *   This device is labeled as just S. 921 at the top of the frontend can
0005  *
0006  *   Copyright (C) 2009-2010 Mauro Carvalho Chehab
0007  *   Copyright (C) 2009-2010 Douglas Landgraf <dougsland@redhat.com>
0008  *
0009  *   Developed for Leadership SBTVD 1seg device sold in Brazil
0010  *
0011  *   Frontend module based on cx24123 driver, getting some info from
0012  *  the old s921 driver.
0013  *
0014  *   FIXME: Need to port to DVB v5.2 API
0015  */
0016 
0017 #include <linux/kernel.h>
0018 #include <asm/div64.h>
0019 
0020 #include <media/dvb_frontend.h>
0021 #include "s921.h"
0022 
0023 static int debug = 1;
0024 module_param(debug, int, 0644);
0025 MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)");
0026 
0027 #define rc(args...)  do {                       \
0028     printk(KERN_ERR  "s921: " args);                \
0029 } while (0)
0030 
0031 #define dprintk(args...)                        \
0032     do {                                \
0033         if (debug) {                        \
0034             printk(KERN_DEBUG "s921: %s: ", __func__);  \
0035             printk(args);                   \
0036         }                           \
0037     } while (0)
0038 
0039 struct s921_state {
0040     struct i2c_adapter *i2c;
0041     const struct s921_config *config;
0042 
0043     struct dvb_frontend frontend;
0044 
0045     /* The Demod can't easily provide these, we cache them */
0046     u32 currentfreq;
0047 };
0048 
0049 /*
0050  * Various tuner defaults need to be established for a given frequency kHz.
0051  * fixme: The bounds on the bands do not match the doc in real life.
0052  * fixme: Some of them have been moved, other might need adjustment.
0053  */
0054 static struct s921_bandselect_val {
0055     u32 freq_low;
0056     u8  band_reg;
0057 } s921_bandselect[] = {
0058     {         0, 0x7b },
0059     { 485140000, 0x5b },
0060     { 515140000, 0x3b },
0061     { 545140000, 0x1b },
0062     { 599140000, 0xfb },
0063     { 623140000, 0xdb },
0064     { 659140000, 0xbb },
0065     { 713140000, 0x9b },
0066 };
0067 
0068 struct regdata {
0069     u8 reg;
0070     u8 data;
0071 };
0072 
0073 static struct regdata s921_init[] = {
0074     { 0x01, 0x80 },     /* Probably, a reset sequence */
0075     { 0x01, 0x40 },
0076     { 0x01, 0x80 },
0077     { 0x01, 0x40 },
0078 
0079     { 0x02, 0x00 },
0080     { 0x03, 0x40 },
0081     { 0x04, 0x01 },
0082     { 0x05, 0x00 },
0083     { 0x06, 0x00 },
0084     { 0x07, 0x00 },
0085     { 0x08, 0x00 },
0086     { 0x09, 0x00 },
0087     { 0x0a, 0x00 },
0088     { 0x0b, 0x5a },
0089     { 0x0c, 0x00 },
0090     { 0x0d, 0x00 },
0091     { 0x0f, 0x00 },
0092     { 0x13, 0x1b },
0093     { 0x14, 0x80 },
0094     { 0x15, 0x40 },
0095     { 0x17, 0x70 },
0096     { 0x18, 0x01 },
0097     { 0x19, 0x12 },
0098     { 0x1a, 0x01 },
0099     { 0x1b, 0x12 },
0100     { 0x1c, 0xa0 },
0101     { 0x1d, 0x00 },
0102     { 0x1e, 0x0a },
0103     { 0x1f, 0x08 },
0104     { 0x20, 0x40 },
0105     { 0x21, 0xff },
0106     { 0x22, 0x4c },
0107     { 0x23, 0x4e },
0108     { 0x24, 0x4c },
0109     { 0x25, 0x00 },
0110     { 0x26, 0x00 },
0111     { 0x27, 0xf4 },
0112     { 0x28, 0x60 },
0113     { 0x29, 0x88 },
0114     { 0x2a, 0x40 },
0115     { 0x2b, 0x40 },
0116     { 0x2c, 0xff },
0117     { 0x2d, 0x00 },
0118     { 0x2e, 0xff },
0119     { 0x2f, 0x00 },
0120     { 0x30, 0x20 },
0121     { 0x31, 0x06 },
0122     { 0x32, 0x0c },
0123     { 0x34, 0x0f },
0124     { 0x37, 0xfe },
0125     { 0x38, 0x00 },
0126     { 0x39, 0x63 },
0127     { 0x3a, 0x10 },
0128     { 0x3b, 0x10 },
0129     { 0x47, 0x00 },
0130     { 0x49, 0xe5 },
0131     { 0x4b, 0x00 },
0132     { 0x50, 0xc0 },
0133     { 0x52, 0x20 },
0134     { 0x54, 0x5a },
0135     { 0x55, 0x5b },
0136     { 0x56, 0x40 },
0137     { 0x57, 0x70 },
0138     { 0x5c, 0x50 },
0139     { 0x5d, 0x00 },
0140     { 0x62, 0x17 },
0141     { 0x63, 0x2f },
0142     { 0x64, 0x6f },
0143     { 0x68, 0x00 },
0144     { 0x69, 0x89 },
0145     { 0x6a, 0x00 },
0146     { 0x6b, 0x00 },
0147     { 0x6c, 0x00 },
0148     { 0x6d, 0x00 },
0149     { 0x6e, 0x00 },
0150     { 0x70, 0x10 },
0151     { 0x71, 0x00 },
0152     { 0x75, 0x00 },
0153     { 0x76, 0x30 },
0154     { 0x77, 0x01 },
0155     { 0xaf, 0x00 },
0156     { 0xb0, 0xa0 },
0157     { 0xb2, 0x3d },
0158     { 0xb3, 0x25 },
0159     { 0xb4, 0x8b },
0160     { 0xb5, 0x4b },
0161     { 0xb6, 0x3f },
0162     { 0xb7, 0xff },
0163     { 0xb8, 0xff },
0164     { 0xb9, 0xfc },
0165     { 0xba, 0x00 },
0166     { 0xbb, 0x00 },
0167     { 0xbc, 0x00 },
0168     { 0xd0, 0x30 },
0169     { 0xe4, 0x84 },
0170     { 0xf0, 0x48 },
0171     { 0xf1, 0x19 },
0172     { 0xf2, 0x5a },
0173     { 0xf3, 0x8e },
0174     { 0xf4, 0x2d },
0175     { 0xf5, 0x07 },
0176     { 0xf6, 0x5a },
0177     { 0xf7, 0xba },
0178     { 0xf8, 0xd7 },
0179 };
0180 
0181 static struct regdata s921_prefreq[] = {
0182     { 0x47, 0x60 },
0183     { 0x68, 0x00 },
0184     { 0x69, 0x89 },
0185     { 0xf0, 0x48 },
0186     { 0xf1, 0x19 },
0187 };
0188 
0189 static struct regdata s921_postfreq[] = {
0190     { 0xf5, 0xae },
0191     { 0xf6, 0xb7 },
0192     { 0xf7, 0xba },
0193     { 0xf8, 0xd7 },
0194     { 0x68, 0x0a },
0195     { 0x69, 0x09 },
0196 };
0197 
0198 static int s921_i2c_writereg(struct s921_state *state,
0199                  u8 i2c_addr, int reg, int data)
0200 {
0201     u8 buf[] = { reg, data };
0202     struct i2c_msg msg = {
0203         .addr = i2c_addr, .flags = 0, .buf = buf, .len = 2
0204     };
0205     int rc;
0206 
0207     rc = i2c_transfer(state->i2c, &msg, 1);
0208     if (rc != 1) {
0209         printk("%s: writereg rcor(rc == %i, reg == 0x%02x, data == 0x%02x)\n",
0210                __func__, rc, reg, data);
0211         return rc;
0212     }
0213 
0214     return 0;
0215 }
0216 
0217 static int s921_i2c_writeregdata(struct s921_state *state, u8 i2c_addr,
0218                  struct regdata *rd, int size)
0219 {
0220     int i, rc;
0221 
0222     for (i = 0; i < size; i++) {
0223         rc = s921_i2c_writereg(state, i2c_addr, rd[i].reg, rd[i].data);
0224         if (rc < 0)
0225             return rc;
0226     }
0227     return 0;
0228 }
0229 
0230 static int s921_i2c_readreg(struct s921_state *state, u8 i2c_addr, u8 reg)
0231 {
0232     u8 val;
0233     int rc;
0234     struct i2c_msg msg[] = {
0235         { .addr = i2c_addr, .flags = 0, .buf = &reg, .len = 1 },
0236         { .addr = i2c_addr, .flags = I2C_M_RD, .buf = &val, .len = 1 }
0237     };
0238 
0239     rc = i2c_transfer(state->i2c, msg, 2);
0240 
0241     if (rc != 2) {
0242         rc("%s: reg=0x%x (rcor=%d)\n", __func__, reg, rc);
0243         return rc;
0244     }
0245 
0246     return val;
0247 }
0248 
0249 #define s921_readreg(state, reg) \
0250     s921_i2c_readreg(state, state->config->demod_address, reg)
0251 #define s921_writereg(state, reg, val) \
0252     s921_i2c_writereg(state, state->config->demod_address, reg, val)
0253 #define s921_writeregdata(state, regdata) \
0254     s921_i2c_writeregdata(state, state->config->demod_address, \
0255     regdata, ARRAY_SIZE(regdata))
0256 
0257 static int s921_pll_tune(struct dvb_frontend *fe)
0258 {
0259     struct dtv_frontend_properties *p = &fe->dtv_property_cache;
0260     struct s921_state *state = fe->demodulator_priv;
0261     int band, rc, i;
0262     unsigned long f_offset;
0263     u8 f_switch;
0264     u64 offset;
0265 
0266     dprintk("frequency=%i\n", p->frequency);
0267 
0268     for (band = 0; band < ARRAY_SIZE(s921_bandselect); band++)
0269         if (p->frequency < s921_bandselect[band].freq_low)
0270             break;
0271     band--;
0272 
0273     if (band < 0) {
0274         rc("%s: frequency out of range\n", __func__);
0275         return -EINVAL;
0276     }
0277 
0278     f_switch = s921_bandselect[band].band_reg;
0279 
0280     offset = ((u64)p->frequency) * 258;
0281     do_div(offset, 6000000);
0282     f_offset = ((unsigned long)offset) + 2321;
0283 
0284     rc = s921_writeregdata(state, s921_prefreq);
0285     if (rc < 0)
0286         return rc;
0287 
0288     rc = s921_writereg(state, 0xf2, (f_offset >> 8) & 0xff);
0289     if (rc < 0)
0290         return rc;
0291 
0292     rc = s921_writereg(state, 0xf3, f_offset & 0xff);
0293     if (rc < 0)
0294         return rc;
0295 
0296     rc = s921_writereg(state, 0xf4, f_switch);
0297     if (rc < 0)
0298         return rc;
0299 
0300     rc = s921_writeregdata(state, s921_postfreq);
0301     if (rc < 0)
0302         return rc;
0303 
0304     for (i = 0 ; i < 6; i++) {
0305         rc = s921_readreg(state, 0x80);
0306         dprintk("status 0x80: %02x\n", rc);
0307     }
0308     rc = s921_writereg(state, 0x01, 0x40);
0309     if (rc < 0)
0310         return rc;
0311 
0312     rc = s921_readreg(state, 0x01);
0313     dprintk("status 0x01: %02x\n", rc);
0314 
0315     rc = s921_readreg(state, 0x80);
0316     dprintk("status 0x80: %02x\n", rc);
0317 
0318     rc = s921_readreg(state, 0x80);
0319     dprintk("status 0x80: %02x\n", rc);
0320 
0321     rc = s921_readreg(state, 0x32);
0322     dprintk("status 0x32: %02x\n", rc);
0323 
0324     dprintk("pll tune band=%d, pll=%d\n", f_switch, (int)f_offset);
0325 
0326     return 0;
0327 }
0328 
0329 static int s921_initfe(struct dvb_frontend *fe)
0330 {
0331     struct s921_state *state = fe->demodulator_priv;
0332     int rc;
0333 
0334     dprintk("\n");
0335 
0336     rc = s921_writeregdata(state, s921_init);
0337     if (rc < 0)
0338         return rc;
0339 
0340     return 0;
0341 }
0342 
0343 static int s921_read_status(struct dvb_frontend *fe, enum fe_status *status)
0344 {
0345     struct s921_state *state = fe->demodulator_priv;
0346     int regstatus, rc;
0347 
0348     *status = 0;
0349 
0350     rc = s921_readreg(state, 0x81);
0351     if (rc < 0)
0352         return rc;
0353 
0354     regstatus = rc << 8;
0355 
0356     rc = s921_readreg(state, 0x82);
0357     if (rc < 0)
0358         return rc;
0359 
0360     regstatus |= rc;
0361 
0362     dprintk("status = %04x\n", regstatus);
0363 
0364     /* Full Sync - We don't know what each bit means on regs 0x81/0x82 */
0365     if ((regstatus & 0xff) == 0x40) {
0366         *status = FE_HAS_SIGNAL  |
0367               FE_HAS_CARRIER |
0368               FE_HAS_VITERBI |
0369               FE_HAS_SYNC    |
0370               FE_HAS_LOCK;
0371     } else if (regstatus & 0x40) {
0372         /* This is close to Full Sync, but not enough to get useful info */
0373         *status = FE_HAS_SIGNAL  |
0374               FE_HAS_CARRIER |
0375               FE_HAS_VITERBI |
0376               FE_HAS_SYNC;
0377     }
0378 
0379     return 0;
0380 }
0381 
0382 static int s921_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
0383 {
0384     enum fe_status  status;
0385     struct s921_state *state = fe->demodulator_priv;
0386     int rc;
0387 
0388     /* FIXME: Use the proper register for it... 0x80? */
0389     rc = s921_read_status(fe, &status);
0390     if (rc < 0)
0391         return rc;
0392 
0393     *strength = (status & FE_HAS_LOCK) ? 0xffff : 0;
0394 
0395     dprintk("strength = 0x%04x\n", *strength);
0396 
0397     rc = s921_readreg(state, 0x01);
0398     dprintk("status 0x01: %02x\n", rc);
0399 
0400     rc = s921_readreg(state, 0x80);
0401     dprintk("status 0x80: %02x\n", rc);
0402 
0403     rc = s921_readreg(state, 0x32);
0404     dprintk("status 0x32: %02x\n", rc);
0405 
0406     return 0;
0407 }
0408 
0409 static int s921_set_frontend(struct dvb_frontend *fe)
0410 {
0411     struct dtv_frontend_properties *p = &fe->dtv_property_cache;
0412     struct s921_state *state = fe->demodulator_priv;
0413     int rc;
0414 
0415     dprintk("\n");
0416 
0417     /* FIXME: We don't know how to use non-auto mode */
0418 
0419     rc = s921_pll_tune(fe);
0420     if (rc < 0)
0421         return rc;
0422 
0423     state->currentfreq = p->frequency;
0424 
0425     return 0;
0426 }
0427 
0428 static int s921_get_frontend(struct dvb_frontend *fe,
0429                  struct dtv_frontend_properties *p)
0430 {
0431     struct s921_state *state = fe->demodulator_priv;
0432 
0433     /* FIXME: Probably it is possible to get it from regs f1 and f2 */
0434     p->frequency = state->currentfreq;
0435     p->delivery_system = SYS_ISDBT;
0436 
0437     return 0;
0438 }
0439 
0440 static int s921_tune(struct dvb_frontend *fe,
0441             bool re_tune,
0442             unsigned int mode_flags,
0443             unsigned int *delay,
0444             enum fe_status *status)
0445 {
0446     int rc = 0;
0447 
0448     dprintk("\n");
0449 
0450     if (re_tune)
0451         rc = s921_set_frontend(fe);
0452 
0453     if (!(mode_flags & FE_TUNE_MODE_ONESHOT))
0454         s921_read_status(fe, status);
0455 
0456     return rc;
0457 }
0458 
0459 static enum dvbfe_algo s921_get_algo(struct dvb_frontend *fe)
0460 {
0461     return DVBFE_ALGO_HW;
0462 }
0463 
0464 static void s921_release(struct dvb_frontend *fe)
0465 {
0466     struct s921_state *state = fe->demodulator_priv;
0467 
0468     dprintk("\n");
0469     kfree(state);
0470 }
0471 
0472 static const struct dvb_frontend_ops s921_ops;
0473 
0474 struct dvb_frontend *s921_attach(const struct s921_config *config,
0475                     struct i2c_adapter *i2c)
0476 {
0477     /* allocate memory for the internal state */
0478     struct s921_state *state =
0479         kzalloc(sizeof(struct s921_state), GFP_KERNEL);
0480 
0481     dprintk("\n");
0482     if (!state) {
0483         rc("Unable to kzalloc\n");
0484         return NULL;
0485     }
0486 
0487     /* setup the state */
0488     state->config = config;
0489     state->i2c = i2c;
0490 
0491     /* create dvb_frontend */
0492     memcpy(&state->frontend.ops, &s921_ops,
0493         sizeof(struct dvb_frontend_ops));
0494     state->frontend.demodulator_priv = state;
0495 
0496     return &state->frontend;
0497 }
0498 EXPORT_SYMBOL(s921_attach);
0499 
0500 static const struct dvb_frontend_ops s921_ops = {
0501     .delsys = { SYS_ISDBT },
0502     /* Use dib8000 values per default */
0503     .info = {
0504         .name = "Sharp S921",
0505         .frequency_min_hz = 470 * MHz,
0506         /*
0507          * Max should be 770MHz instead, according with Sharp docs,
0508          * but Leadership doc says it works up to 806 MHz. This is
0509          * required to get channel 69, used in Brazil
0510          */
0511         .frequency_max_hz = 806 * MHz,
0512         .caps =  FE_CAN_INVERSION_AUTO |
0513              FE_CAN_FEC_1_2  | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
0514              FE_CAN_FEC_5_6  | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
0515              FE_CAN_QPSK     | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
0516              FE_CAN_QAM_AUTO | FE_CAN_TRANSMISSION_MODE_AUTO |
0517              FE_CAN_GUARD_INTERVAL_AUTO | FE_CAN_RECOVER |
0518              FE_CAN_HIERARCHY_AUTO,
0519     },
0520 
0521     .release = s921_release,
0522 
0523     .init = s921_initfe,
0524     .set_frontend = s921_set_frontend,
0525     .get_frontend = s921_get_frontend,
0526     .read_status = s921_read_status,
0527     .read_signal_strength = s921_read_signal_strength,
0528     .tune = s921_tune,
0529     .get_frontend_algo = s921_get_algo,
0530 };
0531 
0532 MODULE_DESCRIPTION("DVB Frontend module for Sharp S921 hardware");
0533 MODULE_AUTHOR("Mauro Carvalho Chehab");
0534 MODULE_AUTHOR("Douglas Landgraf <dougsland@redhat.com>");
0535 MODULE_LICENSE("GPL");
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