Antti Palosaari | 51ff2e2 | 2010-08-13 03:41:02 -0300 | [diff] [blame] | 1 | /* |
| 2 | * NXP TDA18218HN silicon tuner driver |
| 3 | * |
| 4 | * Copyright (C) 2010 Antti Palosaari <crope@iki.fi> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 19 | */ |
| 20 | |
| 21 | #include "tda18218.h" |
| 22 | #include "tda18218_priv.h" |
| 23 | |
| 24 | static int debug; |
| 25 | module_param(debug, int, 0644); |
| 26 | MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)."); |
| 27 | |
| 28 | /* write multiple registers */ |
| 29 | static int tda18218_wr_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len) |
| 30 | { |
Hans Verkuil | 0c8fc77 | 2010-12-31 12:26:53 -0300 | [diff] [blame] | 31 | int ret = 0; |
Antti Palosaari | 51ff2e2 | 2010-08-13 03:41:02 -0300 | [diff] [blame] | 32 | u8 buf[1+len], quotient, remainder, i, msg_len, msg_len_max; |
| 33 | struct i2c_msg msg[1] = { |
| 34 | { |
| 35 | .addr = priv->cfg->i2c_address, |
| 36 | .flags = 0, |
| 37 | .buf = buf, |
| 38 | } |
| 39 | }; |
| 40 | |
| 41 | msg_len_max = priv->cfg->i2c_wr_max - 1; |
| 42 | quotient = len / msg_len_max; |
| 43 | remainder = len % msg_len_max; |
| 44 | msg_len = msg_len_max; |
| 45 | for (i = 0; (i <= quotient && remainder); i++) { |
| 46 | if (i == quotient) /* set len of the last msg */ |
| 47 | msg_len = remainder; |
| 48 | |
| 49 | msg[0].len = msg_len + 1; |
| 50 | buf[0] = reg + i * msg_len_max; |
| 51 | memcpy(&buf[1], &val[i * msg_len_max], msg_len); |
| 52 | |
| 53 | ret = i2c_transfer(priv->i2c, msg, 1); |
| 54 | if (ret != 1) |
| 55 | break; |
| 56 | } |
| 57 | |
| 58 | if (ret == 1) { |
| 59 | ret = 0; |
| 60 | } else { |
| 61 | warn("i2c wr failed ret:%d reg:%02x len:%d", ret, reg, len); |
| 62 | ret = -EREMOTEIO; |
| 63 | } |
| 64 | |
| 65 | return ret; |
| 66 | } |
| 67 | |
| 68 | /* read multiple registers */ |
| 69 | static int tda18218_rd_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len) |
| 70 | { |
| 71 | int ret; |
| 72 | u8 buf[reg+len]; /* we must start read always from reg 0x00 */ |
| 73 | struct i2c_msg msg[2] = { |
| 74 | { |
| 75 | .addr = priv->cfg->i2c_address, |
| 76 | .flags = 0, |
| 77 | .len = 1, |
| 78 | .buf = "\x00", |
| 79 | }, { |
| 80 | .addr = priv->cfg->i2c_address, |
| 81 | .flags = I2C_M_RD, |
| 82 | .len = sizeof(buf), |
| 83 | .buf = buf, |
| 84 | } |
| 85 | }; |
| 86 | |
| 87 | ret = i2c_transfer(priv->i2c, msg, 2); |
| 88 | if (ret == 2) { |
| 89 | memcpy(val, &buf[reg], len); |
| 90 | ret = 0; |
| 91 | } else { |
| 92 | warn("i2c rd failed ret:%d reg:%02x len:%d", ret, reg, len); |
| 93 | ret = -EREMOTEIO; |
| 94 | } |
| 95 | |
| 96 | return ret; |
| 97 | } |
| 98 | |
| 99 | /* write single register */ |
| 100 | static int tda18218_wr_reg(struct tda18218_priv *priv, u8 reg, u8 val) |
| 101 | { |
| 102 | return tda18218_wr_regs(priv, reg, &val, 1); |
| 103 | } |
| 104 | |
| 105 | /* read single register */ |
| 106 | |
| 107 | static int tda18218_rd_reg(struct tda18218_priv *priv, u8 reg, u8 *val) |
| 108 | { |
| 109 | return tda18218_rd_regs(priv, reg, val, 1); |
| 110 | } |
| 111 | |
| 112 | static int tda18218_set_params(struct dvb_frontend *fe, |
| 113 | struct dvb_frontend_parameters *params) |
| 114 | { |
| 115 | struct tda18218_priv *priv = fe->tuner_priv; |
| 116 | int ret; |
| 117 | u8 buf[3], i, BP_Filter, LP_Fc; |
| 118 | u32 LO_Frac; |
| 119 | /* TODO: find out correct AGC algorithm */ |
| 120 | u8 agc[][2] = { |
| 121 | { R20_AGC11, 0x60 }, |
| 122 | { R23_AGC21, 0x02 }, |
| 123 | { R20_AGC11, 0xa0 }, |
| 124 | { R23_AGC21, 0x09 }, |
| 125 | { R20_AGC11, 0xe0 }, |
| 126 | { R23_AGC21, 0x0c }, |
| 127 | { R20_AGC11, 0x40 }, |
| 128 | { R23_AGC21, 0x01 }, |
| 129 | { R20_AGC11, 0x80 }, |
| 130 | { R23_AGC21, 0x08 }, |
| 131 | { R20_AGC11, 0xc0 }, |
| 132 | { R23_AGC21, 0x0b }, |
| 133 | { R24_AGC22, 0x1c }, |
| 134 | { R24_AGC22, 0x0c }, |
| 135 | }; |
| 136 | |
| 137 | if (fe->ops.i2c_gate_ctrl) |
| 138 | fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */ |
| 139 | |
| 140 | /* low-pass filter cut-off frequency */ |
| 141 | switch (params->u.ofdm.bandwidth) { |
| 142 | case BANDWIDTH_6_MHZ: |
| 143 | LP_Fc = 0; |
| 144 | LO_Frac = params->frequency + 4000000; |
| 145 | break; |
| 146 | case BANDWIDTH_7_MHZ: |
| 147 | LP_Fc = 1; |
| 148 | LO_Frac = params->frequency + 3500000; |
| 149 | break; |
| 150 | case BANDWIDTH_8_MHZ: |
| 151 | default: |
| 152 | LP_Fc = 2; |
| 153 | LO_Frac = params->frequency + 4000000; |
| 154 | break; |
| 155 | } |
| 156 | |
| 157 | /* band-pass filter */ |
| 158 | if (LO_Frac < 188000000) |
| 159 | BP_Filter = 3; |
| 160 | else if (LO_Frac < 253000000) |
| 161 | BP_Filter = 4; |
| 162 | else if (LO_Frac < 343000000) |
| 163 | BP_Filter = 5; |
| 164 | else |
| 165 | BP_Filter = 6; |
| 166 | |
| 167 | buf[0] = (priv->regs[R1A_IF1] & ~7) | BP_Filter; /* BP_Filter */ |
| 168 | buf[1] = (priv->regs[R1B_IF2] & ~3) | LP_Fc; /* LP_Fc */ |
| 169 | buf[2] = priv->regs[R1C_AGC2B]; |
| 170 | ret = tda18218_wr_regs(priv, R1A_IF1, buf, 3); |
| 171 | if (ret) |
| 172 | goto error; |
| 173 | |
| 174 | buf[0] = (LO_Frac / 1000) >> 12; /* LO_Frac_0 */ |
| 175 | buf[1] = (LO_Frac / 1000) >> 4; /* LO_Frac_1 */ |
| 176 | buf[2] = (LO_Frac / 1000) << 4 | |
| 177 | (priv->regs[R0C_MD5] & 0x0f); /* LO_Frac_2 */ |
| 178 | ret = tda18218_wr_regs(priv, R0A_MD3, buf, 3); |
| 179 | if (ret) |
| 180 | goto error; |
| 181 | |
| 182 | buf[0] = priv->regs[R0F_MD8] | (1 << 6); /* Freq_prog_Start */ |
| 183 | ret = tda18218_wr_regs(priv, R0F_MD8, buf, 1); |
| 184 | if (ret) |
| 185 | goto error; |
| 186 | |
| 187 | buf[0] = priv->regs[R0F_MD8] & ~(1 << 6); /* Freq_prog_Start */ |
| 188 | ret = tda18218_wr_regs(priv, R0F_MD8, buf, 1); |
| 189 | if (ret) |
| 190 | goto error; |
| 191 | |
| 192 | /* trigger AGC */ |
| 193 | for (i = 0; i < ARRAY_SIZE(agc); i++) { |
| 194 | ret = tda18218_wr_reg(priv, agc[i][0], agc[i][1]); |
| 195 | if (ret) |
| 196 | goto error; |
| 197 | } |
| 198 | |
| 199 | error: |
| 200 | if (fe->ops.i2c_gate_ctrl) |
| 201 | fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */ |
| 202 | |
| 203 | if (ret) |
| 204 | dbg("%s: failed ret:%d", __func__, ret); |
| 205 | |
| 206 | return ret; |
| 207 | } |
| 208 | |
| 209 | static int tda18218_sleep(struct dvb_frontend *fe) |
| 210 | { |
| 211 | struct tda18218_priv *priv = fe->tuner_priv; |
| 212 | int ret; |
| 213 | |
| 214 | if (fe->ops.i2c_gate_ctrl) |
| 215 | fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */ |
| 216 | |
| 217 | /* standby */ |
| 218 | ret = tda18218_wr_reg(priv, R17_PD1, priv->regs[R17_PD1] | (1 << 0)); |
| 219 | |
| 220 | if (fe->ops.i2c_gate_ctrl) |
| 221 | fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */ |
| 222 | |
| 223 | if (ret) |
| 224 | dbg("%s: failed ret:%d", __func__, ret); |
| 225 | |
| 226 | return ret; |
| 227 | } |
| 228 | |
| 229 | static int tda18218_init(struct dvb_frontend *fe) |
| 230 | { |
| 231 | struct tda18218_priv *priv = fe->tuner_priv; |
| 232 | int ret; |
| 233 | |
| 234 | /* TODO: calibrations */ |
| 235 | |
| 236 | if (fe->ops.i2c_gate_ctrl) |
| 237 | fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */ |
| 238 | |
| 239 | ret = tda18218_wr_regs(priv, R00_ID, priv->regs, TDA18218_NUM_REGS); |
| 240 | |
| 241 | if (fe->ops.i2c_gate_ctrl) |
| 242 | fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */ |
| 243 | |
| 244 | if (ret) |
| 245 | dbg("%s: failed ret:%d", __func__, ret); |
| 246 | |
| 247 | return ret; |
| 248 | } |
| 249 | |
| 250 | static int tda18218_release(struct dvb_frontend *fe) |
| 251 | { |
| 252 | kfree(fe->tuner_priv); |
| 253 | fe->tuner_priv = NULL; |
| 254 | return 0; |
| 255 | } |
| 256 | |
| 257 | static const struct dvb_tuner_ops tda18218_tuner_ops = { |
| 258 | .info = { |
| 259 | .name = "NXP TDA18218", |
| 260 | |
| 261 | .frequency_min = 174000000, |
| 262 | .frequency_max = 864000000, |
| 263 | .frequency_step = 1000, |
| 264 | }, |
| 265 | |
| 266 | .release = tda18218_release, |
| 267 | .init = tda18218_init, |
| 268 | .sleep = tda18218_sleep, |
| 269 | |
| 270 | .set_params = tda18218_set_params, |
| 271 | }; |
| 272 | |
| 273 | struct dvb_frontend *tda18218_attach(struct dvb_frontend *fe, |
| 274 | struct i2c_adapter *i2c, struct tda18218_config *cfg) |
| 275 | { |
| 276 | struct tda18218_priv *priv = NULL; |
| 277 | u8 val; |
| 278 | int ret; |
| 279 | /* chip default registers values */ |
| 280 | static u8 def_regs[] = { |
| 281 | 0xc0, 0x88, 0x00, 0x8e, 0x03, 0x00, 0x00, 0xd0, 0x00, 0x40, |
| 282 | 0x00, 0x00, 0x07, 0xff, 0x84, 0x09, 0x00, 0x13, 0x00, 0x00, |
| 283 | 0x01, 0x84, 0x09, 0xf0, 0x19, 0x0a, 0x8e, 0x69, 0x98, 0x01, |
| 284 | 0x00, 0x58, 0x10, 0x40, 0x8c, 0x00, 0x0c, 0x48, 0x85, 0xc9, |
| 285 | 0xa7, 0x00, 0x00, 0x00, 0x30, 0x81, 0x80, 0x00, 0x39, 0x00, |
| 286 | 0x8a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf6, 0xf6 |
| 287 | }; |
| 288 | |
| 289 | priv = kzalloc(sizeof(struct tda18218_priv), GFP_KERNEL); |
| 290 | if (priv == NULL) |
| 291 | return NULL; |
| 292 | |
| 293 | priv->cfg = cfg; |
| 294 | priv->i2c = i2c; |
| 295 | fe->tuner_priv = priv; |
| 296 | |
| 297 | if (fe->ops.i2c_gate_ctrl) |
| 298 | fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */ |
| 299 | |
| 300 | /* check if the tuner is there */ |
| 301 | ret = tda18218_rd_reg(priv, R00_ID, &val); |
| 302 | dbg("%s: ret:%d chip ID:%02x", __func__, ret, val); |
| 303 | if (ret || val != def_regs[R00_ID]) { |
| 304 | kfree(priv); |
| 305 | return NULL; |
| 306 | } |
| 307 | |
| 308 | info("NXP TDA18218HN successfully identified."); |
| 309 | |
| 310 | memcpy(&fe->ops.tuner_ops, &tda18218_tuner_ops, |
| 311 | sizeof(struct dvb_tuner_ops)); |
| 312 | memcpy(priv->regs, def_regs, sizeof(def_regs)); |
| 313 | |
| 314 | /* loop-through enabled chip default register values */ |
| 315 | if (priv->cfg->loop_through) { |
| 316 | priv->regs[R17_PD1] = 0xb0; |
| 317 | priv->regs[R18_PD2] = 0x59; |
| 318 | } |
| 319 | |
| 320 | /* standby */ |
| 321 | ret = tda18218_wr_reg(priv, R17_PD1, priv->regs[R17_PD1] | (1 << 0)); |
| 322 | if (ret) |
| 323 | dbg("%s: failed ret:%d", __func__, ret); |
| 324 | |
| 325 | if (fe->ops.i2c_gate_ctrl) |
| 326 | fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */ |
| 327 | |
| 328 | return fe; |
| 329 | } |
| 330 | EXPORT_SYMBOL(tda18218_attach); |
| 331 | |
| 332 | MODULE_DESCRIPTION("NXP TDA18218HN silicon tuner driver"); |
| 333 | MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>"); |
| 334 | MODULE_LICENSE("GPL"); |