| /* |
| * NXP TDA18218HN silicon tuner driver |
| * |
| * Copyright (C) 2010 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., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| #include "tda18218.h" |
| #include "tda18218_priv.h" |
| |
| static int debug; |
| module_param(debug, int, 0644); |
| MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)."); |
| |
| /* write multiple registers */ |
| static int tda18218_wr_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len) |
| { |
| int ret; |
| u8 buf[1+len], quotient, remainder, i, msg_len, msg_len_max; |
| struct i2c_msg msg[1] = { |
| { |
| .addr = priv->cfg->i2c_address, |
| .flags = 0, |
| .buf = buf, |
| } |
| }; |
| |
| msg_len_max = priv->cfg->i2c_wr_max - 1; |
| quotient = len / msg_len_max; |
| remainder = len % msg_len_max; |
| msg_len = msg_len_max; |
| for (i = 0; (i <= quotient && remainder); i++) { |
| if (i == quotient) /* set len of the last msg */ |
| msg_len = remainder; |
| |
| msg[0].len = msg_len + 1; |
| buf[0] = reg + i * msg_len_max; |
| memcpy(&buf[1], &val[i * msg_len_max], msg_len); |
| |
| ret = i2c_transfer(priv->i2c, msg, 1); |
| if (ret != 1) |
| break; |
| } |
| |
| if (ret == 1) { |
| ret = 0; |
| } else { |
| warn("i2c wr failed ret:%d reg:%02x len:%d", ret, reg, len); |
| ret = -EREMOTEIO; |
| } |
| |
| return ret; |
| } |
| |
| /* read multiple registers */ |
| static int tda18218_rd_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len) |
| { |
| int ret; |
| u8 buf[reg+len]; /* we must start read always from reg 0x00 */ |
| struct i2c_msg msg[2] = { |
| { |
| .addr = priv->cfg->i2c_address, |
| .flags = 0, |
| .len = 1, |
| .buf = "\x00", |
| }, { |
| .addr = priv->cfg->i2c_address, |
| .flags = I2C_M_RD, |
| .len = sizeof(buf), |
| .buf = buf, |
| } |
| }; |
| |
| ret = i2c_transfer(priv->i2c, msg, 2); |
| if (ret == 2) { |
| memcpy(val, &buf[reg], len); |
| ret = 0; |
| } else { |
| warn("i2c rd failed ret:%d reg:%02x len:%d", ret, reg, len); |
| ret = -EREMOTEIO; |
| } |
| |
| return ret; |
| } |
| |
| /* write single register */ |
| static int tda18218_wr_reg(struct tda18218_priv *priv, u8 reg, u8 val) |
| { |
| return tda18218_wr_regs(priv, reg, &val, 1); |
| } |
| |
| /* read single register */ |
| |
| static int tda18218_rd_reg(struct tda18218_priv *priv, u8 reg, u8 *val) |
| { |
| return tda18218_rd_regs(priv, reg, val, 1); |
| } |
| |
| static int tda18218_set_params(struct dvb_frontend *fe, |
| struct dvb_frontend_parameters *params) |
| { |
| struct tda18218_priv *priv = fe->tuner_priv; |
| int ret; |
| u8 buf[3], i, BP_Filter, LP_Fc; |
| u32 LO_Frac; |
| /* TODO: find out correct AGC algorithm */ |
| u8 agc[][2] = { |
| { R20_AGC11, 0x60 }, |
| { R23_AGC21, 0x02 }, |
| { R20_AGC11, 0xa0 }, |
| { R23_AGC21, 0x09 }, |
| { R20_AGC11, 0xe0 }, |
| { R23_AGC21, 0x0c }, |
| { R20_AGC11, 0x40 }, |
| { R23_AGC21, 0x01 }, |
| { R20_AGC11, 0x80 }, |
| { R23_AGC21, 0x08 }, |
| { R20_AGC11, 0xc0 }, |
| { R23_AGC21, 0x0b }, |
| { R24_AGC22, 0x1c }, |
| { R24_AGC22, 0x0c }, |
| }; |
| |
| if (fe->ops.i2c_gate_ctrl) |
| fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */ |
| |
| /* low-pass filter cut-off frequency */ |
| switch (params->u.ofdm.bandwidth) { |
| case BANDWIDTH_6_MHZ: |
| LP_Fc = 0; |
| LO_Frac = params->frequency + 4000000; |
| break; |
| case BANDWIDTH_7_MHZ: |
| LP_Fc = 1; |
| LO_Frac = params->frequency + 3500000; |
| break; |
| case BANDWIDTH_8_MHZ: |
| default: |
| LP_Fc = 2; |
| LO_Frac = params->frequency + 4000000; |
| break; |
| } |
| |
| /* band-pass filter */ |
| if (LO_Frac < 188000000) |
| BP_Filter = 3; |
| else if (LO_Frac < 253000000) |
| BP_Filter = 4; |
| else if (LO_Frac < 343000000) |
| BP_Filter = 5; |
| else |
| BP_Filter = 6; |
| |
| buf[0] = (priv->regs[R1A_IF1] & ~7) | BP_Filter; /* BP_Filter */ |
| buf[1] = (priv->regs[R1B_IF2] & ~3) | LP_Fc; /* LP_Fc */ |
| buf[2] = priv->regs[R1C_AGC2B]; |
| ret = tda18218_wr_regs(priv, R1A_IF1, buf, 3); |
| if (ret) |
| goto error; |
| |
| buf[0] = (LO_Frac / 1000) >> 12; /* LO_Frac_0 */ |
| buf[1] = (LO_Frac / 1000) >> 4; /* LO_Frac_1 */ |
| buf[2] = (LO_Frac / 1000) << 4 | |
| (priv->regs[R0C_MD5] & 0x0f); /* LO_Frac_2 */ |
| ret = tda18218_wr_regs(priv, R0A_MD3, buf, 3); |
| if (ret) |
| goto error; |
| |
| buf[0] = priv->regs[R0F_MD8] | (1 << 6); /* Freq_prog_Start */ |
| ret = tda18218_wr_regs(priv, R0F_MD8, buf, 1); |
| if (ret) |
| goto error; |
| |
| buf[0] = priv->regs[R0F_MD8] & ~(1 << 6); /* Freq_prog_Start */ |
| ret = tda18218_wr_regs(priv, R0F_MD8, buf, 1); |
| if (ret) |
| goto error; |
| |
| /* trigger AGC */ |
| for (i = 0; i < ARRAY_SIZE(agc); i++) { |
| ret = tda18218_wr_reg(priv, agc[i][0], agc[i][1]); |
| if (ret) |
| goto error; |
| } |
| |
| error: |
| if (fe->ops.i2c_gate_ctrl) |
| fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */ |
| |
| if (ret) |
| dbg("%s: failed ret:%d", __func__, ret); |
| |
| return ret; |
| } |
| |
| static int tda18218_sleep(struct dvb_frontend *fe) |
| { |
| struct tda18218_priv *priv = fe->tuner_priv; |
| int ret; |
| |
| if (fe->ops.i2c_gate_ctrl) |
| fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */ |
| |
| /* standby */ |
| ret = tda18218_wr_reg(priv, R17_PD1, priv->regs[R17_PD1] | (1 << 0)); |
| |
| if (fe->ops.i2c_gate_ctrl) |
| fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */ |
| |
| if (ret) |
| dbg("%s: failed ret:%d", __func__, ret); |
| |
| return ret; |
| } |
| |
| static int tda18218_init(struct dvb_frontend *fe) |
| { |
| struct tda18218_priv *priv = fe->tuner_priv; |
| int ret; |
| |
| /* TODO: calibrations */ |
| |
| if (fe->ops.i2c_gate_ctrl) |
| fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */ |
| |
| ret = tda18218_wr_regs(priv, R00_ID, priv->regs, TDA18218_NUM_REGS); |
| |
| if (fe->ops.i2c_gate_ctrl) |
| fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */ |
| |
| if (ret) |
| dbg("%s: failed ret:%d", __func__, ret); |
| |
| return ret; |
| } |
| |
| static int tda18218_release(struct dvb_frontend *fe) |
| { |
| kfree(fe->tuner_priv); |
| fe->tuner_priv = NULL; |
| return 0; |
| } |
| |
| static const struct dvb_tuner_ops tda18218_tuner_ops = { |
| .info = { |
| .name = "NXP TDA18218", |
| |
| .frequency_min = 174000000, |
| .frequency_max = 864000000, |
| .frequency_step = 1000, |
| }, |
| |
| .release = tda18218_release, |
| .init = tda18218_init, |
| .sleep = tda18218_sleep, |
| |
| .set_params = tda18218_set_params, |
| }; |
| |
| struct dvb_frontend *tda18218_attach(struct dvb_frontend *fe, |
| struct i2c_adapter *i2c, struct tda18218_config *cfg) |
| { |
| struct tda18218_priv *priv = NULL; |
| u8 val; |
| int ret; |
| /* chip default registers values */ |
| static u8 def_regs[] = { |
| 0xc0, 0x88, 0x00, 0x8e, 0x03, 0x00, 0x00, 0xd0, 0x00, 0x40, |
| 0x00, 0x00, 0x07, 0xff, 0x84, 0x09, 0x00, 0x13, 0x00, 0x00, |
| 0x01, 0x84, 0x09, 0xf0, 0x19, 0x0a, 0x8e, 0x69, 0x98, 0x01, |
| 0x00, 0x58, 0x10, 0x40, 0x8c, 0x00, 0x0c, 0x48, 0x85, 0xc9, |
| 0xa7, 0x00, 0x00, 0x00, 0x30, 0x81, 0x80, 0x00, 0x39, 0x00, |
| 0x8a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf6, 0xf6 |
| }; |
| |
| priv = kzalloc(sizeof(struct tda18218_priv), GFP_KERNEL); |
| if (priv == NULL) |
| return NULL; |
| |
| priv->cfg = cfg; |
| priv->i2c = i2c; |
| fe->tuner_priv = priv; |
| |
| if (fe->ops.i2c_gate_ctrl) |
| fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */ |
| |
| /* check if the tuner is there */ |
| ret = tda18218_rd_reg(priv, R00_ID, &val); |
| dbg("%s: ret:%d chip ID:%02x", __func__, ret, val); |
| if (ret || val != def_regs[R00_ID]) { |
| kfree(priv); |
| return NULL; |
| } |
| |
| info("NXP TDA18218HN successfully identified."); |
| |
| memcpy(&fe->ops.tuner_ops, &tda18218_tuner_ops, |
| sizeof(struct dvb_tuner_ops)); |
| memcpy(priv->regs, def_regs, sizeof(def_regs)); |
| |
| /* loop-through enabled chip default register values */ |
| if (priv->cfg->loop_through) { |
| priv->regs[R17_PD1] = 0xb0; |
| priv->regs[R18_PD2] = 0x59; |
| } |
| |
| /* standby */ |
| ret = tda18218_wr_reg(priv, R17_PD1, priv->regs[R17_PD1] | (1 << 0)); |
| if (ret) |
| dbg("%s: failed ret:%d", __func__, ret); |
| |
| if (fe->ops.i2c_gate_ctrl) |
| fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */ |
| |
| return fe; |
| } |
| EXPORT_SYMBOL(tda18218_attach); |
| |
| MODULE_DESCRIPTION("NXP TDA18218HN silicon tuner driver"); |
| MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>"); |
| MODULE_LICENSE("GPL"); |