Jochen Friedrich | b72dbae | 2009-02-02 14:50:09 -0300 | [diff] [blame] | 1 | /* |
| 2 | * Driver for Freescale MC44S803 Low Power CMOS Broadband Tuner |
| 3 | * |
| 4 | * Copyright (c) 2009 Jochen Friedrich <jochen@scram.de> |
| 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 | * |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.= |
| 20 | */ |
| 21 | |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/delay.h> |
| 24 | #include <linux/dvb/frontend.h> |
| 25 | #include <linux/i2c.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 26 | #include <linux/slab.h> |
Jochen Friedrich | b72dbae | 2009-02-02 14:50:09 -0300 | [diff] [blame] | 27 | |
| 28 | #include "dvb_frontend.h" |
| 29 | |
| 30 | #include "mc44s803.h" |
| 31 | #include "mc44s803_priv.h" |
| 32 | |
| 33 | #define mc_printk(level, format, arg...) \ |
| 34 | printk(level "mc44s803: " format , ## arg) |
| 35 | |
| 36 | /* Writes a single register */ |
| 37 | static int mc44s803_writereg(struct mc44s803_priv *priv, u32 val) |
| 38 | { |
| 39 | u8 buf[3]; |
| 40 | struct i2c_msg msg = { |
| 41 | .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 3 |
| 42 | }; |
| 43 | |
| 44 | buf[0] = (val & 0xff0000) >> 16; |
| 45 | buf[1] = (val & 0xff00) >> 8; |
| 46 | buf[2] = (val & 0xff); |
| 47 | |
| 48 | if (i2c_transfer(priv->i2c, &msg, 1) != 1) { |
| 49 | mc_printk(KERN_WARNING, "I2C write failed\n"); |
| 50 | return -EREMOTEIO; |
| 51 | } |
| 52 | return 0; |
| 53 | } |
| 54 | |
| 55 | /* Reads a single register */ |
| 56 | static int mc44s803_readreg(struct mc44s803_priv *priv, u8 reg, u32 *val) |
| 57 | { |
| 58 | u32 wval; |
| 59 | u8 buf[3]; |
| 60 | int ret; |
| 61 | struct i2c_msg msg[] = { |
| 62 | { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, |
| 63 | .buf = buf, .len = 3 }, |
| 64 | }; |
| 65 | |
| 66 | wval = MC44S803_REG_SM(MC44S803_REG_DATAREG, MC44S803_ADDR) | |
| 67 | MC44S803_REG_SM(reg, MC44S803_D); |
| 68 | |
| 69 | ret = mc44s803_writereg(priv, wval); |
| 70 | if (ret) |
| 71 | return ret; |
| 72 | |
| 73 | if (i2c_transfer(priv->i2c, msg, 1) != 1) { |
| 74 | mc_printk(KERN_WARNING, "I2C read failed\n"); |
| 75 | return -EREMOTEIO; |
| 76 | } |
| 77 | |
| 78 | *val = (buf[0] << 16) | (buf[1] << 8) | buf[2]; |
| 79 | |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | static int mc44s803_release(struct dvb_frontend *fe) |
| 84 | { |
| 85 | struct mc44s803_priv *priv = fe->tuner_priv; |
| 86 | |
| 87 | fe->tuner_priv = NULL; |
| 88 | kfree(priv); |
| 89 | |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | static int mc44s803_init(struct dvb_frontend *fe) |
| 94 | { |
| 95 | struct mc44s803_priv *priv = fe->tuner_priv; |
| 96 | u32 val; |
| 97 | int err; |
| 98 | |
| 99 | if (fe->ops.i2c_gate_ctrl) |
| 100 | fe->ops.i2c_gate_ctrl(fe, 1); |
| 101 | |
| 102 | /* Reset chip */ |
| 103 | val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR) | |
| 104 | MC44S803_REG_SM(1, MC44S803_RS); |
| 105 | |
| 106 | err = mc44s803_writereg(priv, val); |
| 107 | if (err) |
| 108 | goto exit; |
| 109 | |
| 110 | val = MC44S803_REG_SM(MC44S803_REG_RESET, MC44S803_ADDR); |
| 111 | |
| 112 | err = mc44s803_writereg(priv, val); |
| 113 | if (err) |
| 114 | goto exit; |
| 115 | |
| 116 | /* Power Up and Start Osc */ |
| 117 | |
| 118 | val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) | |
| 119 | MC44S803_REG_SM(0xC0, MC44S803_REFOSC) | |
| 120 | MC44S803_REG_SM(1, MC44S803_OSCSEL); |
| 121 | |
| 122 | err = mc44s803_writereg(priv, val); |
| 123 | if (err) |
| 124 | goto exit; |
| 125 | |
| 126 | val = MC44S803_REG_SM(MC44S803_REG_POWER, MC44S803_ADDR) | |
| 127 | MC44S803_REG_SM(0x200, MC44S803_POWER); |
| 128 | |
| 129 | err = mc44s803_writereg(priv, val); |
| 130 | if (err) |
| 131 | goto exit; |
| 132 | |
| 133 | msleep(10); |
| 134 | |
| 135 | val = MC44S803_REG_SM(MC44S803_REG_REFOSC, MC44S803_ADDR) | |
| 136 | MC44S803_REG_SM(0x40, MC44S803_REFOSC) | |
| 137 | MC44S803_REG_SM(1, MC44S803_OSCSEL); |
| 138 | |
| 139 | err = mc44s803_writereg(priv, val); |
| 140 | if (err) |
| 141 | goto exit; |
| 142 | |
| 143 | msleep(20); |
| 144 | |
| 145 | /* Setup Mixer */ |
| 146 | |
| 147 | val = MC44S803_REG_SM(MC44S803_REG_MIXER, MC44S803_ADDR) | |
| 148 | MC44S803_REG_SM(1, MC44S803_TRI_STATE) | |
| 149 | MC44S803_REG_SM(0x7F, MC44S803_MIXER_RES); |
| 150 | |
| 151 | err = mc44s803_writereg(priv, val); |
| 152 | if (err) |
| 153 | goto exit; |
| 154 | |
| 155 | /* Setup Cirquit Adjust */ |
| 156 | |
| 157 | val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) | |
| 158 | MC44S803_REG_SM(1, MC44S803_G1) | |
| 159 | MC44S803_REG_SM(1, MC44S803_G3) | |
| 160 | MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) | |
| 161 | MC44S803_REG_SM(1, MC44S803_G6) | |
| 162 | MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) | |
| 163 | MC44S803_REG_SM(0x3, MC44S803_LP) | |
| 164 | MC44S803_REG_SM(1, MC44S803_CLRF) | |
| 165 | MC44S803_REG_SM(1, MC44S803_CLIF); |
| 166 | |
| 167 | err = mc44s803_writereg(priv, val); |
| 168 | if (err) |
| 169 | goto exit; |
| 170 | |
| 171 | val = MC44S803_REG_SM(MC44S803_REG_CIRCADJ, MC44S803_ADDR) | |
| 172 | MC44S803_REG_SM(1, MC44S803_G1) | |
| 173 | MC44S803_REG_SM(1, MC44S803_G3) | |
| 174 | MC44S803_REG_SM(0x3, MC44S803_CIRCADJ_RES) | |
| 175 | MC44S803_REG_SM(1, MC44S803_G6) | |
| 176 | MC44S803_REG_SM(priv->cfg->dig_out, MC44S803_S1) | |
| 177 | MC44S803_REG_SM(0x3, MC44S803_LP); |
| 178 | |
| 179 | err = mc44s803_writereg(priv, val); |
| 180 | if (err) |
| 181 | goto exit; |
| 182 | |
| 183 | /* Setup Digtune */ |
| 184 | |
| 185 | val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) | |
| 186 | MC44S803_REG_SM(3, MC44S803_XOD); |
| 187 | |
| 188 | err = mc44s803_writereg(priv, val); |
| 189 | if (err) |
| 190 | goto exit; |
| 191 | |
| 192 | /* Setup AGC */ |
| 193 | |
| 194 | val = MC44S803_REG_SM(MC44S803_REG_LNAAGC, MC44S803_ADDR) | |
| 195 | MC44S803_REG_SM(1, MC44S803_AT1) | |
| 196 | MC44S803_REG_SM(1, MC44S803_AT2) | |
| 197 | MC44S803_REG_SM(1, MC44S803_AGC_AN_DIG) | |
| 198 | MC44S803_REG_SM(1, MC44S803_AGC_READ_EN) | |
| 199 | MC44S803_REG_SM(1, MC44S803_LNA0); |
| 200 | |
| 201 | err = mc44s803_writereg(priv, val); |
| 202 | if (err) |
| 203 | goto exit; |
| 204 | |
| 205 | if (fe->ops.i2c_gate_ctrl) |
| 206 | fe->ops.i2c_gate_ctrl(fe, 0); |
| 207 | return 0; |
| 208 | |
| 209 | exit: |
| 210 | if (fe->ops.i2c_gate_ctrl) |
| 211 | fe->ops.i2c_gate_ctrl(fe, 0); |
| 212 | |
| 213 | mc_printk(KERN_WARNING, "I/O Error\n"); |
| 214 | return err; |
| 215 | } |
| 216 | |
Mauro Carvalho Chehab | 14d24d1 | 2011-12-24 12:24:33 -0300 | [diff] [blame] | 217 | static int mc44s803_set_params(struct dvb_frontend *fe) |
Jochen Friedrich | b72dbae | 2009-02-02 14:50:09 -0300 | [diff] [blame] | 218 | { |
| 219 | struct mc44s803_priv *priv = fe->tuner_priv; |
Mauro Carvalho Chehab | 35fea06 | 2011-12-20 16:53:50 -0300 | [diff] [blame] | 220 | struct dtv_frontend_properties *c = &fe->dtv_property_cache; |
Jochen Friedrich | b72dbae | 2009-02-02 14:50:09 -0300 | [diff] [blame] | 221 | u32 r1, r2, n1, n2, lo1, lo2, freq, val; |
| 222 | int err; |
| 223 | |
Mauro Carvalho Chehab | 35fea06 | 2011-12-20 16:53:50 -0300 | [diff] [blame] | 224 | priv->frequency = c->frequency; |
Jochen Friedrich | b72dbae | 2009-02-02 14:50:09 -0300 | [diff] [blame] | 225 | |
| 226 | r1 = MC44S803_OSC / 1000000; |
| 227 | r2 = MC44S803_OSC / 100000; |
| 228 | |
Mauro Carvalho Chehab | 35fea06 | 2011-12-20 16:53:50 -0300 | [diff] [blame] | 229 | n1 = (c->frequency + MC44S803_IF1 + 500000) / 1000000; |
Jochen Friedrich | b72dbae | 2009-02-02 14:50:09 -0300 | [diff] [blame] | 230 | freq = MC44S803_OSC / r1 * n1; |
| 231 | lo1 = ((60 * n1) + (r1 / 2)) / r1; |
Mauro Carvalho Chehab | 35fea06 | 2011-12-20 16:53:50 -0300 | [diff] [blame] | 232 | freq = freq - c->frequency; |
Jochen Friedrich | b72dbae | 2009-02-02 14:50:09 -0300 | [diff] [blame] | 233 | |
| 234 | n2 = (freq - MC44S803_IF2 + 50000) / 100000; |
| 235 | lo2 = ((60 * n2) + (r2 / 2)) / r2; |
| 236 | |
| 237 | if (fe->ops.i2c_gate_ctrl) |
| 238 | fe->ops.i2c_gate_ctrl(fe, 1); |
| 239 | |
| 240 | val = MC44S803_REG_SM(MC44S803_REG_REFDIV, MC44S803_ADDR) | |
| 241 | MC44S803_REG_SM(r1-1, MC44S803_R1) | |
| 242 | MC44S803_REG_SM(r2-1, MC44S803_R2) | |
| 243 | MC44S803_REG_SM(1, MC44S803_REFBUF_EN); |
| 244 | |
| 245 | err = mc44s803_writereg(priv, val); |
| 246 | if (err) |
| 247 | goto exit; |
| 248 | |
| 249 | val = MC44S803_REG_SM(MC44S803_REG_LO1, MC44S803_ADDR) | |
| 250 | MC44S803_REG_SM(n1-2, MC44S803_LO1); |
| 251 | |
| 252 | err = mc44s803_writereg(priv, val); |
| 253 | if (err) |
| 254 | goto exit; |
| 255 | |
| 256 | val = MC44S803_REG_SM(MC44S803_REG_LO2, MC44S803_ADDR) | |
| 257 | MC44S803_REG_SM(n2-2, MC44S803_LO2); |
| 258 | |
| 259 | err = mc44s803_writereg(priv, val); |
| 260 | if (err) |
| 261 | goto exit; |
| 262 | |
| 263 | val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) | |
| 264 | MC44S803_REG_SM(1, MC44S803_DA) | |
| 265 | MC44S803_REG_SM(lo1, MC44S803_LO_REF) | |
| 266 | MC44S803_REG_SM(1, MC44S803_AT); |
| 267 | |
| 268 | err = mc44s803_writereg(priv, val); |
| 269 | if (err) |
| 270 | goto exit; |
| 271 | |
| 272 | val = MC44S803_REG_SM(MC44S803_REG_DIGTUNE, MC44S803_ADDR) | |
| 273 | MC44S803_REG_SM(2, MC44S803_DA) | |
| 274 | MC44S803_REG_SM(lo2, MC44S803_LO_REF) | |
| 275 | MC44S803_REG_SM(1, MC44S803_AT); |
| 276 | |
| 277 | err = mc44s803_writereg(priv, val); |
| 278 | if (err) |
| 279 | goto exit; |
| 280 | |
| 281 | if (fe->ops.i2c_gate_ctrl) |
| 282 | fe->ops.i2c_gate_ctrl(fe, 0); |
| 283 | |
| 284 | return 0; |
| 285 | |
| 286 | exit: |
| 287 | if (fe->ops.i2c_gate_ctrl) |
| 288 | fe->ops.i2c_gate_ctrl(fe, 0); |
| 289 | |
| 290 | mc_printk(KERN_WARNING, "I/O Error\n"); |
| 291 | return err; |
| 292 | } |
| 293 | |
| 294 | static int mc44s803_get_frequency(struct dvb_frontend *fe, u32 *frequency) |
| 295 | { |
| 296 | struct mc44s803_priv *priv = fe->tuner_priv; |
| 297 | *frequency = priv->frequency; |
| 298 | return 0; |
| 299 | } |
| 300 | |
| 301 | static const struct dvb_tuner_ops mc44s803_tuner_ops = { |
| 302 | .info = { |
| 303 | .name = "Freescale MC44S803", |
| 304 | .frequency_min = 48000000, |
| 305 | .frequency_max = 1000000000, |
| 306 | .frequency_step = 100000, |
| 307 | }, |
| 308 | |
| 309 | .release = mc44s803_release, |
| 310 | .init = mc44s803_init, |
| 311 | .set_params = mc44s803_set_params, |
| 312 | .get_frequency = mc44s803_get_frequency |
| 313 | }; |
| 314 | |
| 315 | /* This functions tries to identify a MC44S803 tuner by reading the ID |
| 316 | register. This is hasty. */ |
| 317 | struct dvb_frontend *mc44s803_attach(struct dvb_frontend *fe, |
| 318 | struct i2c_adapter *i2c, struct mc44s803_config *cfg) |
| 319 | { |
| 320 | struct mc44s803_priv *priv; |
| 321 | u32 reg; |
| 322 | u8 id; |
| 323 | int ret; |
| 324 | |
| 325 | reg = 0; |
| 326 | |
| 327 | priv = kzalloc(sizeof(struct mc44s803_priv), GFP_KERNEL); |
| 328 | if (priv == NULL) |
| 329 | return NULL; |
| 330 | |
| 331 | priv->cfg = cfg; |
| 332 | priv->i2c = i2c; |
| 333 | priv->fe = fe; |
| 334 | |
| 335 | if (fe->ops.i2c_gate_ctrl) |
| 336 | fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */ |
| 337 | |
| 338 | ret = mc44s803_readreg(priv, MC44S803_REG_ID, ®); |
| 339 | if (ret) |
| 340 | goto error; |
| 341 | |
| 342 | id = MC44S803_REG_MS(reg, MC44S803_ID); |
| 343 | |
| 344 | if (id != 0x14) { |
| 345 | mc_printk(KERN_ERR, "unsupported ID " |
| 346 | "(%x should be 0x14)\n", id); |
| 347 | goto error; |
| 348 | } |
| 349 | |
| 350 | mc_printk(KERN_INFO, "successfully identified (ID = %x)\n", id); |
| 351 | memcpy(&fe->ops.tuner_ops, &mc44s803_tuner_ops, |
| 352 | sizeof(struct dvb_tuner_ops)); |
| 353 | |
| 354 | fe->tuner_priv = priv; |
| 355 | |
| 356 | if (fe->ops.i2c_gate_ctrl) |
| 357 | fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */ |
| 358 | |
| 359 | return fe; |
| 360 | |
| 361 | error: |
| 362 | if (fe->ops.i2c_gate_ctrl) |
| 363 | fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */ |
| 364 | |
| 365 | kfree(priv); |
| 366 | return NULL; |
| 367 | } |
| 368 | EXPORT_SYMBOL(mc44s803_attach); |
| 369 | |
| 370 | MODULE_AUTHOR("Jochen Friedrich"); |
| 371 | MODULE_DESCRIPTION("Freescale MC44S803 silicon tuner driver"); |
| 372 | MODULE_LICENSE("GPL"); |