1 /* 2 * Driver for Microtune MT2131 "QAM/8VSB single chip tuner" 3 * 4 * Copyright (c) 2006 Steven Toth <stoth@linuxtv.org> 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 18 #include <linux/module.h> 19 #include <linux/delay.h> 20 #include <linux/dvb/frontend.h> 21 #include <linux/i2c.h> 22 #include <linux/slab.h> 23 24 #include <media/dvb_frontend.h> 25 26 #include "mt2131.h" 27 #include "mt2131_priv.h" 28 29 static int debug; 30 module_param(debug, int, 0644); 31 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)."); 32 33 #define dprintk(level,fmt, arg...) if (debug >= level) \ 34 printk(KERN_INFO "%s: " fmt, "mt2131", ## arg) 35 36 static u8 mt2131_config1[] = { 37 0x01, 38 0x50, 0x00, 0x50, 0x80, 0x00, 0x49, 0xfa, 0x88, 39 0x08, 0x77, 0x41, 0x04, 0x00, 0x00, 0x00, 0x32, 40 0x7f, 0xda, 0x4c, 0x00, 0x10, 0xaa, 0x78, 0x80, 41 0xff, 0x68, 0xa0, 0xff, 0xdd, 0x00, 0x00 42 }; 43 44 static u8 mt2131_config2[] = { 45 0x10, 46 0x7f, 0xc8, 0x0a, 0x5f, 0x00, 0x04 47 }; 48 49 static int mt2131_readreg(struct mt2131_priv *priv, u8 reg, u8 *val) 50 { 51 struct i2c_msg msg[2] = { 52 { .addr = priv->cfg->i2c_address, .flags = 0, 53 .buf = ®, .len = 1 }, 54 { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, 55 .buf = val, .len = 1 }, 56 }; 57 58 if (i2c_transfer(priv->i2c, msg, 2) != 2) { 59 printk(KERN_WARNING "mt2131 I2C read failed\n"); 60 return -EREMOTEIO; 61 } 62 return 0; 63 } 64 65 static int mt2131_writereg(struct mt2131_priv *priv, u8 reg, u8 val) 66 { 67 u8 buf[2] = { reg, val }; 68 struct i2c_msg msg = { .addr = priv->cfg->i2c_address, .flags = 0, 69 .buf = buf, .len = 2 }; 70 71 if (i2c_transfer(priv->i2c, &msg, 1) != 1) { 72 printk(KERN_WARNING "mt2131 I2C write failed\n"); 73 return -EREMOTEIO; 74 } 75 return 0; 76 } 77 78 static int mt2131_writeregs(struct mt2131_priv *priv,u8 *buf, u8 len) 79 { 80 struct i2c_msg msg = { .addr = priv->cfg->i2c_address, 81 .flags = 0, .buf = buf, .len = len }; 82 83 if (i2c_transfer(priv->i2c, &msg, 1) != 1) { 84 printk(KERN_WARNING "mt2131 I2C write failed (len=%i)\n", 85 (int)len); 86 return -EREMOTEIO; 87 } 88 return 0; 89 } 90 91 static int mt2131_set_params(struct dvb_frontend *fe) 92 { 93 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 94 struct mt2131_priv *priv; 95 int ret=0, i; 96 u32 freq; 97 u8 if_band_center; 98 u32 f_lo1, f_lo2; 99 u32 div1, num1, div2, num2; 100 u8 b[8]; 101 u8 lockval = 0; 102 103 priv = fe->tuner_priv; 104 105 freq = c->frequency / 1000; /* Hz -> kHz */ 106 dprintk(1, "%s() freq=%d\n", __func__, freq); 107 108 f_lo1 = freq + MT2131_IF1 * 1000; 109 f_lo1 = (f_lo1 / 250) * 250; 110 f_lo2 = f_lo1 - freq - MT2131_IF2; 111 112 priv->frequency = (f_lo1 - f_lo2 - MT2131_IF2) * 1000; 113 114 /* Frequency LO1 = 16MHz * (DIV1 + NUM1/8192 ) */ 115 num1 = f_lo1 * 64 / (MT2131_FREF / 128); 116 div1 = num1 / 8192; 117 num1 &= 0x1fff; 118 119 /* Frequency LO2 = 16MHz * (DIV2 + NUM2/8192 ) */ 120 num2 = f_lo2 * 64 / (MT2131_FREF / 128); 121 div2 = num2 / 8192; 122 num2 &= 0x1fff; 123 124 if (freq <= 82500) if_band_center = 0x00; else 125 if (freq <= 137500) if_band_center = 0x01; else 126 if (freq <= 192500) if_band_center = 0x02; else 127 if (freq <= 247500) if_band_center = 0x03; else 128 if (freq <= 302500) if_band_center = 0x04; else 129 if (freq <= 357500) if_band_center = 0x05; else 130 if (freq <= 412500) if_band_center = 0x06; else 131 if (freq <= 467500) if_band_center = 0x07; else 132 if (freq <= 522500) if_band_center = 0x08; else 133 if (freq <= 577500) if_band_center = 0x09; else 134 if (freq <= 632500) if_band_center = 0x0A; else 135 if (freq <= 687500) if_band_center = 0x0B; else 136 if (freq <= 742500) if_band_center = 0x0C; else 137 if (freq <= 797500) if_band_center = 0x0D; else 138 if (freq <= 852500) if_band_center = 0x0E; else 139 if (freq <= 907500) if_band_center = 0x0F; else 140 if (freq <= 962500) if_band_center = 0x10; else 141 if (freq <= 1017500) if_band_center = 0x11; else 142 if (freq <= 1072500) if_band_center = 0x12; else if_band_center = 0x13; 143 144 b[0] = 1; 145 b[1] = (num1 >> 5) & 0xFF; 146 b[2] = (num1 & 0x1F); 147 b[3] = div1; 148 b[4] = (num2 >> 5) & 0xFF; 149 b[5] = num2 & 0x1F; 150 b[6] = div2; 151 152 dprintk(1, "IF1: %dMHz IF2: %dMHz\n", MT2131_IF1, MT2131_IF2); 153 dprintk(1, "PLL freq=%dkHz band=%d\n", (int)freq, (int)if_band_center); 154 dprintk(1, "PLL f_lo1=%dkHz f_lo2=%dkHz\n", (int)f_lo1, (int)f_lo2); 155 dprintk(1, "PLL div1=%d num1=%d div2=%d num2=%d\n", 156 (int)div1, (int)num1, (int)div2, (int)num2); 157 dprintk(1, "PLL [1..6]: %2x %2x %2x %2x %2x %2x\n", 158 (int)b[1], (int)b[2], (int)b[3], (int)b[4], (int)b[5], 159 (int)b[6]); 160 161 ret = mt2131_writeregs(priv,b,7); 162 if (ret < 0) 163 return ret; 164 165 mt2131_writereg(priv, 0x0b, if_band_center); 166 167 /* Wait for lock */ 168 i = 0; 169 do { 170 mt2131_readreg(priv, 0x08, &lockval); 171 if ((lockval & 0x88) == 0x88) 172 break; 173 msleep(4); 174 i++; 175 } while (i < 10); 176 177 return ret; 178 } 179 180 static int mt2131_get_frequency(struct dvb_frontend *fe, u32 *frequency) 181 { 182 struct mt2131_priv *priv = fe->tuner_priv; 183 dprintk(1, "%s()\n", __func__); 184 *frequency = priv->frequency; 185 return 0; 186 } 187 188 static int mt2131_get_status(struct dvb_frontend *fe, u32 *status) 189 { 190 struct mt2131_priv *priv = fe->tuner_priv; 191 u8 lock_status = 0; 192 u8 afc_status = 0; 193 194 *status = 0; 195 196 mt2131_readreg(priv, 0x08, &lock_status); 197 if ((lock_status & 0x88) == 0x88) 198 *status = TUNER_STATUS_LOCKED; 199 200 mt2131_readreg(priv, 0x09, &afc_status); 201 dprintk(1, "%s() - LO Status = 0x%x, AFC Status = 0x%x\n", 202 __func__, lock_status, afc_status); 203 204 return 0; 205 } 206 207 static int mt2131_init(struct dvb_frontend *fe) 208 { 209 struct mt2131_priv *priv = fe->tuner_priv; 210 int ret; 211 dprintk(1, "%s()\n", __func__); 212 213 if ((ret = mt2131_writeregs(priv, mt2131_config1, 214 sizeof(mt2131_config1))) < 0) 215 return ret; 216 217 mt2131_writereg(priv, 0x0b, 0x09); 218 mt2131_writereg(priv, 0x15, 0x47); 219 mt2131_writereg(priv, 0x07, 0xf2); 220 mt2131_writereg(priv, 0x0b, 0x01); 221 222 if ((ret = mt2131_writeregs(priv, mt2131_config2, 223 sizeof(mt2131_config2))) < 0) 224 return ret; 225 226 return ret; 227 } 228 229 static void mt2131_release(struct dvb_frontend *fe) 230 { 231 dprintk(1, "%s()\n", __func__); 232 kfree(fe->tuner_priv); 233 fe->tuner_priv = NULL; 234 } 235 236 static const struct dvb_tuner_ops mt2131_tuner_ops = { 237 .info = { 238 .name = "Microtune MT2131", 239 .frequency_min_hz = 48 * MHz, 240 .frequency_max_hz = 860 * MHz, 241 .frequency_step_hz = 50 * kHz, 242 }, 243 244 .release = mt2131_release, 245 .init = mt2131_init, 246 247 .set_params = mt2131_set_params, 248 .get_frequency = mt2131_get_frequency, 249 .get_status = mt2131_get_status 250 }; 251 252 struct dvb_frontend * mt2131_attach(struct dvb_frontend *fe, 253 struct i2c_adapter *i2c, 254 struct mt2131_config *cfg, u16 if1) 255 { 256 struct mt2131_priv *priv = NULL; 257 u8 id = 0; 258 259 dprintk(1, "%s()\n", __func__); 260 261 priv = kzalloc(sizeof(struct mt2131_priv), GFP_KERNEL); 262 if (priv == NULL) 263 return NULL; 264 265 priv->cfg = cfg; 266 priv->i2c = i2c; 267 268 if (mt2131_readreg(priv, 0, &id) != 0) { 269 kfree(priv); 270 return NULL; 271 } 272 if ( (id != 0x3E) && (id != 0x3F) ) { 273 printk(KERN_ERR "MT2131: Device not found at addr 0x%02x\n", 274 cfg->i2c_address); 275 kfree(priv); 276 return NULL; 277 } 278 279 printk(KERN_INFO "MT2131: successfully identified at address 0x%02x\n", 280 cfg->i2c_address); 281 memcpy(&fe->ops.tuner_ops, &mt2131_tuner_ops, 282 sizeof(struct dvb_tuner_ops)); 283 284 fe->tuner_priv = priv; 285 return fe; 286 } 287 EXPORT_SYMBOL(mt2131_attach); 288 289 MODULE_AUTHOR("Steven Toth"); 290 MODULE_DESCRIPTION("Microtune MT2131 silicon tuner driver"); 291 MODULE_LICENSE("GPL"); 292