diff options
Diffstat (limited to 'drivers/media/dvb-frontends/rtl2830.c')
| -rw-r--r-- | drivers/media/dvb-frontends/rtl2830.c | 757 |
1 files changed, 757 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/rtl2830.c b/drivers/media/dvb-frontends/rtl2830.c new file mode 100644 index 000000000000..8fa8b0854e76 --- /dev/null +++ b/drivers/media/dvb-frontends/rtl2830.c @@ -0,0 +1,757 @@ +/* + * Realtek RTL2830 DVB-T demodulator driver + * + * Copyright (C) 2011 Antti Palosaari <crope@iki.fi> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + + +/* + * Driver implements own I2C-adapter for tuner I2C access. That's since chip + * have unusual I2C-gate control which closes gate automatically after each + * I2C transfer. Using own I2C adapter we can workaround that. + */ + +#include "rtl2830_priv.h" + +int rtl2830_debug; +module_param_named(debug, rtl2830_debug, int, 0644); +MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); + +/* write multiple hardware registers */ +static int rtl2830_wr(struct rtl2830_priv *priv, u8 reg, u8 *val, int len) +{ + int ret; + u8 buf[1+len]; + struct i2c_msg msg[1] = { + { + .addr = priv->cfg.i2c_addr, + .flags = 0, + .len = 1+len, + .buf = buf, + } + }; + + buf[0] = reg; + memcpy(&buf[1], val, len); + + ret = i2c_transfer(priv->i2c, msg, 1); + if (ret == 1) { + ret = 0; + } else { + warn("i2c wr failed=%d reg=%02x len=%d", ret, reg, len); + ret = -EREMOTEIO; + } + return ret; +} + +/* read multiple hardware registers */ +static int rtl2830_rd(struct rtl2830_priv *priv, u8 reg, u8 *val, int len) +{ + int ret; + struct i2c_msg msg[2] = { + { + .addr = priv->cfg.i2c_addr, + .flags = 0, + .len = 1, + .buf = ®, + }, { + .addr = priv->cfg.i2c_addr, + .flags = I2C_M_RD, + .len = len, + .buf = val, + } + }; + + ret = i2c_transfer(priv->i2c, msg, 2); + if (ret == 2) { + ret = 0; + } else { + warn("i2c rd failed=%d reg=%02x len=%d", ret, reg, len); + ret = -EREMOTEIO; + } + return ret; +} + +/* write multiple registers */ +static int rtl2830_wr_regs(struct rtl2830_priv *priv, u16 reg, u8 *val, int len) +{ + int ret; + u8 reg2 = (reg >> 0) & 0xff; + u8 page = (reg >> 8) & 0xff; + + /* switch bank if needed */ + if (page != priv->page) { + ret = rtl2830_wr(priv, 0x00, &page, 1); + if (ret) + return ret; + + priv->page = page; + } + + return rtl2830_wr(priv, reg2, val, len); +} + +/* read multiple registers */ +static int rtl2830_rd_regs(struct rtl2830_priv *priv, u16 reg, u8 *val, int len) +{ + int ret; + u8 reg2 = (reg >> 0) & 0xff; + u8 page = (reg >> 8) & 0xff; + + /* switch bank if needed */ + if (page != priv->page) { + ret = rtl2830_wr(priv, 0x00, &page, 1); + if (ret) + return ret; + + priv->page = page; + } + + return rtl2830_rd(priv, reg2, val, len); +} + +#if 0 /* currently not used */ +/* write single register */ +static int rtl2830_wr_reg(struct rtl2830_priv *priv, u16 reg, u8 val) +{ + return rtl2830_wr_regs(priv, reg, &val, 1); +} +#endif + +/* read single register */ +static int rtl2830_rd_reg(struct rtl2830_priv *priv, u16 reg, u8 *val) +{ + return rtl2830_rd_regs(priv, reg, val, 1); +} + +/* write single register with mask */ +int rtl2830_wr_reg_mask(struct rtl2830_priv *priv, u16 reg, u8 val, u8 mask) +{ + int ret; + u8 tmp; + + /* no need for read if whole reg is written */ + if (mask != 0xff) { + ret = rtl2830_rd_regs(priv, reg, &tmp, 1); + if (ret) + return ret; + + val &= mask; + tmp &= ~mask; + val |= tmp; + } + + return rtl2830_wr_regs(priv, reg, &val, 1); +} + +/* read single register with mask */ +int rtl2830_rd_reg_mask(struct rtl2830_priv *priv, u16 reg, u8 *val, u8 mask) +{ + int ret, i; + u8 tmp; + + ret = rtl2830_rd_regs(priv, reg, &tmp, 1); + if (ret) + return ret; + + tmp &= mask; + + /* find position of the first bit */ + for (i = 0; i < 8; i++) { + if ((mask >> i) & 0x01) + break; + } + *val = tmp >> i; + + return 0; +} + +static int rtl2830_init(struct dvb_frontend *fe) +{ + struct rtl2830_priv *priv = fe->demodulator_priv; + int ret, i; + u64 num; + u8 buf[3], tmp; + u32 if_ctl; + struct rtl2830_reg_val_mask tab[] = { + { 0x00d, 0x01, 0x03 }, + { 0x00d, 0x10, 0x10 }, + { 0x104, 0x00, 0x1e }, + { 0x105, 0x80, 0x80 }, + { 0x110, 0x02, 0x03 }, + { 0x110, 0x08, 0x0c }, + { 0x17b, 0x00, 0x40 }, + { 0x17d, 0x05, 0x0f }, + { 0x17d, 0x50, 0xf0 }, + { 0x18c, 0x08, 0x0f }, + { 0x18d, 0x00, 0xc0 }, + { 0x188, 0x05, 0x0f }, + { 0x189, 0x00, 0xfc }, + { 0x2d5, 0x02, 0x02 }, + { 0x2f1, 0x02, 0x06 }, + { 0x2f1, 0x20, 0xf8 }, + { 0x16d, 0x00, 0x01 }, + { 0x1a6, 0x00, 0x80 }, + { 0x106, priv->cfg.vtop, 0x3f }, + { 0x107, priv->cfg.krf, 0x3f }, + { 0x112, 0x28, 0xff }, + { 0x103, priv->cfg.agc_targ_val, 0xff }, + { 0x00a, 0x02, 0x07 }, + { 0x140, 0x0c, 0x3c }, + { 0x140, 0x40, 0xc0 }, + { 0x15b, 0x05, 0x07 }, + { 0x15b, 0x28, 0x38 }, + { 0x15c, 0x05, 0x07 }, + { 0x15c, 0x28, 0x38 }, + { 0x115, priv->cfg.spec_inv, 0x01 }, + { 0x16f, 0x01, 0x07 }, + { 0x170, 0x18, 0x38 }, + { 0x172, 0x0f, 0x0f }, + { 0x173, 0x08, 0x38 }, + { 0x175, 0x01, 0x07 }, + { 0x176, 0x00, 0xc0 }, + }; + + for (i = 0; i < ARRAY_SIZE(tab); i++) { + ret = rtl2830_wr_reg_mask(priv, tab[i].reg, tab[i].val, + tab[i].mask); + if (ret) + goto err; + } + + ret = rtl2830_wr_regs(priv, 0x18f, "\x28\x00", 2); + if (ret) + goto err; + + ret = rtl2830_wr_regs(priv, 0x195, + "\x04\x06\x0a\x12\x0a\x12\x1e\x28", 8); + if (ret) + goto err; + + num = priv->cfg.if_dvbt % priv->cfg.xtal; + num *= 0x400000; + num = div_u64(num, priv->cfg.xtal); + num = -num; + if_ctl = num & 0x3fffff; + dbg("%s: if_ctl=%08x", __func__, if_ctl); + + ret = rtl2830_rd_reg_mask(priv, 0x119, &tmp, 0xc0); /* b[7:6] */ + if (ret) + goto err; + + buf[0] = tmp << 6; + buf[0] = (if_ctl >> 16) & 0x3f; + buf[1] = (if_ctl >> 8) & 0xff; + buf[2] = (if_ctl >> 0) & 0xff; + + ret = rtl2830_wr_regs(priv, 0x119, buf, 3); + if (ret) + goto err; + + /* TODO: spec init */ + + /* soft reset */ + ret = rtl2830_wr_reg_mask(priv, 0x101, 0x04, 0x04); + if (ret) + goto err; + + ret = rtl2830_wr_reg_mask(priv, 0x101, 0x00, 0x04); + if (ret) + goto err; + + priv->sleeping = false; + + return ret; +err: + dbg("%s: failed=%d", __func__, ret); + return ret; +} + +static int rtl2830_sleep(struct dvb_frontend *fe) +{ + struct rtl2830_priv *priv = fe->demodulator_priv; + priv->sleeping = true; + return 0; +} + +int rtl2830_get_tune_settings(struct dvb_frontend *fe, + struct dvb_frontend_tune_settings *s) +{ + s->min_delay_ms = 500; + s->step_size = fe->ops.info.frequency_stepsize * 2; + s->max_drift = (fe->ops.info.frequency_stepsize * 2) + 1; + + return 0; +} + +static int rtl2830_set_frontend(struct dvb_frontend *fe) +{ + struct rtl2830_priv *priv = fe->demodulator_priv; + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + int ret, i; + static u8 bw_params1[3][34] = { + { + 0x1f, 0xf0, 0x1f, 0xf0, 0x1f, 0xfa, 0x00, 0x17, 0x00, 0x41, + 0x00, 0x64, 0x00, 0x67, 0x00, 0x38, 0x1f, 0xde, 0x1f, 0x7a, + 0x1f, 0x47, 0x1f, 0x7c, 0x00, 0x30, 0x01, 0x4b, 0x02, 0x82, + 0x03, 0x73, 0x03, 0xcf, /* 6 MHz */ + }, { + 0x1f, 0xfa, 0x1f, 0xda, 0x1f, 0xc1, 0x1f, 0xb3, 0x1f, 0xca, + 0x00, 0x07, 0x00, 0x4d, 0x00, 0x6d, 0x00, 0x40, 0x1f, 0xca, + 0x1f, 0x4d, 0x1f, 0x2a, 0x1f, 0xb2, 0x00, 0xec, 0x02, 0x7e, + 0x03, 0xd0, 0x04, 0x53, /* 7 MHz */ + }, { + 0x00, 0x10, 0x00, 0x0e, 0x1f, 0xf7, 0x1f, 0xc9, 0x1f, 0xa0, + 0x1f, 0xa6, 0x1f, 0xec, 0x00, 0x4e, 0x00, 0x7d, 0x00, 0x3a, + 0x1f, 0x98, 0x1f, 0x10, 0x1f, 0x40, 0x00, 0x75, 0x02, 0x5f, + 0x04, 0x24, 0x04, 0xdb, /* 8 MHz */ + }, + }; + static u8 bw_params2[3][6] = { + {0xc3, 0x0c, 0x44, 0x33, 0x33, 0x30,}, /* 6 MHz */ + {0xb8, 0xe3, 0x93, 0x99, 0x99, 0x98,}, /* 7 MHz */ + {0xae, 0xba, 0xf3, 0x26, 0x66, 0x64,}, /* 8 MHz */ + }; + + + dbg("%s: frequency=%d bandwidth_hz=%d inversion=%d", __func__, + c->frequency, c->bandwidth_hz, c->inversion); + + /* program tuner */ + if (fe->ops.tuner_ops.set_params) + fe->ops.tuner_ops.set_params(fe); + + switch (c->bandwidth_hz) { + case 6000000: + i = 0; + break; + case 7000000: + i = 1; + break; + case 8000000: + i = 2; + break; + default: + dbg("invalid bandwidth"); + return -EINVAL; + } + + ret = rtl2830_wr_reg_mask(priv, 0x008, i << 1, 0x06); + if (ret) + goto err; + + /* 1/2 split I2C write */ + ret = rtl2830_wr_regs(priv, 0x11c, &bw_params1[i][0], 17); + if (ret) + goto err; + + /* 2/2 split I2C write */ + ret = rtl2830_wr_regs(priv, 0x12d, &bw_params1[i][17], 17); + if (ret) + goto err; + + ret = rtl2830_wr_regs(priv, 0x19d, bw_params2[i], 6); + if (ret) + goto err; + + return ret; +err: + dbg("%s: failed=%d", __func__, ret); + return ret; +} + +static int rtl2830_get_frontend(struct dvb_frontend *fe) +{ + struct rtl2830_priv *priv = fe->demodulator_priv; + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + int ret; + u8 buf[3]; + + if (priv->sleeping) + return 0; + + ret = rtl2830_rd_regs(priv, 0x33c, buf, 2); + if (ret) + goto err; + + ret = rtl2830_rd_reg(priv, 0x351, &buf[2]); + if (ret) + goto err; + + dbg("%s: TPS=%*ph", __func__, 3, buf); + + switch ((buf[0] >> 2) & 3) { + case 0: + c->modulation = QPSK; + break; + case 1: + c->modulation = QAM_16; + break; + case 2: + c->modulation = QAM_64; + break; + } + + switch ((buf[2] >> 2) & 1) { + case 0: + c->transmission_mode = TRANSMISSION_MODE_2K; + break; + case 1: + c->transmission_mode = TRANSMISSION_MODE_8K; + } + + switch ((buf[2] >> 0) & 3) { + case 0: + c->guard_interval = GUARD_INTERVAL_1_32; + break; + case 1: + c->guard_interval = GUARD_INTERVAL_1_16; + break; + case 2: + c->guard_interval = GUARD_INTERVAL_1_8; + break; + case 3: + c->guard_interval = GUARD_INTERVAL_1_4; + break; + } + + switch ((buf[0] >> 4) & 7) { + case 0: + c->hierarchy = HIERARCHY_NONE; + break; + case 1: + c->hierarchy = HIERARCHY_1; + break; + case 2: + c->hierarchy = HIERARCHY_2; + break; + case 3: + c->hierarchy = HIERARCHY_4; + break; + } + + switch ((buf[1] >> 3) & 7) { + case 0: + c->code_rate_HP = FEC_1_2; + break; + case 1: + c->code_rate_HP = FEC_2_3; + break; + case 2: + c->code_rate_HP = FEC_3_4; + break; + case 3: + c->code_rate_HP = FEC_5_6; + break; + case 4: + c->code_rate_HP = FEC_7_8; + break; + } + + switch ((buf[1] >> 0) & 7) { + case 0: + c->code_rate_LP = FEC_1_2; + break; + case 1: + c->code_rate_LP = FEC_2_3; + break; + case 2: + c->code_rate_LP = FEC_3_4; + break; + case 3: + c->code_rate_LP = FEC_5_6; + break; + case 4: + c->code_rate_LP = FEC_7_8; + break; + } + + return 0; +err: + dbg("%s: failed=%d", __func__, ret); + return ret; +} + +static int rtl2830_read_status(struct dvb_frontend *fe, fe_status_t *status) +{ + struct rtl2830_priv *priv = fe->demodulator_priv; + int ret; + u8 tmp; + *status = 0; + + if (priv->sleeping) + return 0; + + ret = rtl2830_rd_reg_mask(priv, 0x351, &tmp, 0x78); /* [6:3] */ + if (ret) + goto err; + + if (tmp == 11) { + *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | + FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK; + } else if (tmp == 10) { + *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | + FE_HAS_VITERBI; + } + + return ret; +err: + dbg("%s: failed=%d", __func__, ret); + return ret; +} + +static int rtl2830_read_snr(struct dvb_frontend *fe, u16 *snr) +{ + struct rtl2830_priv *priv = fe->demodulator_priv; + int ret, hierarchy, constellation; + u8 buf[2], tmp; + u16 tmp16; +#define CONSTELLATION_NUM 3 +#define HIERARCHY_NUM 4 + static const u32 snr_constant[CONSTELLATION_NUM][HIERARCHY_NUM] = { + { 70705899, 70705899, 70705899, 70705899 }, + { 82433173, 82433173, 87483115, 94445660 }, + { 92888734, 92888734, 95487525, 99770748 }, + }; + + if (priv->sleeping) + return 0; + + /* reports SNR in resolution of 0.1 dB */ + + ret = rtl2830_rd_reg(priv, 0x33c, &tmp); + if (ret) + goto err; + + constellation = (tmp >> 2) & 0x03; /* [3:2] */ + if (constellation > CONSTELLATION_NUM - 1) + goto err; + + hierarchy = (tmp >> 4) & 0x07; /* [6:4] */ + if (hierarchy > HIERARCHY_NUM - 1) + goto err; + + ret = rtl2830_rd_regs(priv, 0x40c, buf, 2); + if (ret) + goto err; + + tmp16 = buf[0] << 8 | buf[1]; + + if (tmp16) + *snr = (snr_constant[constellation][hierarchy] - + intlog10(tmp16)) / ((1 << 24) / 100); + else + *snr = 0; + + return 0; +err: + dbg("%s: failed=%d", __func__, ret); + return ret; +} + +static int rtl2830_read_ber(struct dvb_frontend *fe, u32 *ber) +{ + struct rtl2830_priv *priv = fe->demodulator_priv; + int ret; + u8 buf[2]; + + if (priv->sleeping) + return 0; + + ret = rtl2830_rd_regs(priv, 0x34e, buf, 2); + if (ret) + goto err; + + *ber = buf[0] << 8 | buf[1]; + + return 0; +err: + dbg("%s: failed=%d", __func__, ret); + return ret; +} + +static int rtl2830_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks) +{ + *ucblocks = 0; + return 0; +} + +static int rtl2830_read_signal_strength(struct dvb_frontend *fe, u16 *strength) +{ + struct rtl2830_priv *priv = fe->demodulator_priv; + int ret; + u8 buf[2]; + u16 if_agc_raw, if_agc; + + if (priv->sleeping) + return 0; + + ret = rtl2830_rd_regs(priv, 0x359, buf, 2); + if (ret) + goto err; + + if_agc_raw = (buf[0] << 8 | buf[1]) & 0x3fff; + + if (if_agc_raw & (1 << 9)) + if_agc = -(~(if_agc_raw - 1) & 0x1ff); + else + if_agc = if_agc_raw; + + *strength = (u8) (55 - if_agc / 182); + *strength |= *strength << 8; + + return 0; +err: + dbg("%s: failed=%d", __func__, ret); + return ret; +} + +static struct dvb_frontend_ops rtl2830_ops; + +static u32 rtl2830_tuner_i2c_func(struct i2c_adapter *adapter) +{ + return I2C_FUNC_I2C; +} + +static int rtl2830_tuner_i2c_xfer(struct i2c_adapter *i2c_adap, + struct i2c_msg msg[], int num) +{ + struct rtl2830_priv *priv = i2c_get_adapdata(i2c_adap); + int ret; + + /* open i2c-gate */ + ret = rtl2830_wr_reg_mask(priv, 0x101, 0x08, 0x08); + if (ret) + goto err; + + ret = i2c_transfer(priv->i2c, msg, num); + if (ret < 0) + warn("tuner i2c failed=%d", ret); + + return ret; +err: + dbg("%s: failed=%d", __func__, ret); + return ret; +} + +static struct i2c_algorithm rtl2830_tuner_i2c_algo = { + .master_xfer = rtl2830_tuner_i2c_xfer, + .functionality = rtl2830_tuner_i2c_func, +}; + +struct i2c_adapter *rtl2830_get_tuner_i2c_adapter(struct dvb_frontend *fe) +{ + struct rtl2830_priv *priv = fe->demodulator_priv; + return &priv->tuner_i2c_adapter; +} +EXPORT_SYMBOL(rtl2830_get_tuner_i2c_adapter); + +static void rtl2830_release(struct dvb_frontend *fe) +{ + struct rtl2830_priv *priv = fe->demodulator_priv; + + i2c_del_adapter(&priv->tuner_i2c_adapter); + kfree(priv); +} + +struct dvb_frontend *rtl2830_attach(const struct rtl2830_config *cfg, + struct i2c_adapter *i2c) +{ + struct rtl2830_priv *priv = NULL; + int ret = 0; + u8 tmp; + + /* allocate memory for the internal state */ + priv = kzalloc(sizeof(struct rtl2830_priv), GFP_KERNEL); + if (priv == NULL) + goto err; + + /* setup the priv */ + priv->i2c = i2c; + memcpy(&priv->cfg, cfg, sizeof(struct rtl2830_config)); + + /* check if the demod is there */ + ret = rtl2830_rd_reg(priv, 0x000, &tmp); + if (ret) + goto err; + + /* create dvb_frontend */ + memcpy(&priv->fe.ops, &rtl2830_ops, sizeof(struct dvb_frontend_ops)); + priv->fe.demodulator_priv = priv; + + /* create tuner i2c adapter */ + strlcpy(priv->tuner_i2c_adapter.name, "RTL2830 tuner I2C adapter", + sizeof(priv->tuner_i2c_adapter.name)); + priv->tuner_i2c_adapter.algo = &rtl2830_tuner_i2c_algo; + priv->tuner_i2c_adapter.algo_data = NULL; + i2c_set_adapdata(&priv->tuner_i2c_adapter, priv); + if (i2c_add_adapter(&priv->tuner_i2c_adapter) < 0) { + err("tuner I2C bus could not be initialized"); + goto err; + } + + priv->sleeping = true; + + return &priv->fe; +err: + dbg("%s: failed=%d", __func__, ret); + kfree(priv); + return NULL; +} +EXPORT_SYMBOL(rtl2830_attach); + +static struct dvb_frontend_ops rtl2830_ops = { + .delsys = { SYS_DVBT }, + .info = { + .name = "Realtek RTL2830 (DVB-T)", + .caps = FE_CAN_FEC_1_2 | + FE_CAN_FEC_2_3 | + FE_CAN_FEC_3_4 | + FE_CAN_FEC_5_6 | + FE_CAN_FEC_7_8 | + FE_CAN_FEC_AUTO | + FE_CAN_QPSK | + FE_CAN_QAM_16 | + FE_CAN_QAM_64 | + FE_CAN_QAM_AUTO | + FE_CAN_TRANSMISSION_MODE_AUTO | + FE_CAN_GUARD_INTERVAL_AUTO | + FE_CAN_HIERARCHY_AUTO | + FE_CAN_RECOVER | + FE_CAN_MUTE_TS + }, + + .release = rtl2830_release, + + .init = rtl2830_init, + .sleep = rtl2830_sleep, + + .get_tune_settings = rtl2830_get_tune_settings, + + .set_frontend = rtl2830_set_frontend, + .get_frontend = rtl2830_get_frontend, + + .read_status = rtl2830_read_status, + .read_snr = rtl2830_read_snr, + .read_ber = rtl2830_read_ber, + .read_ucblocks = rtl2830_read_ucblocks, + .read_signal_strength = rtl2830_read_signal_strength, +}; + +MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>"); +MODULE_DESCRIPTION("Realtek RTL2830 DVB-T demodulator driver"); +MODULE_LICENSE("GPL"); |