1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Driver for Microtune MT2131 "QAM/8VSB single chip tuner" 4 * 5 * Copyright (c) 2006 Steven Toth <stoth@linuxtv.org> 6 */ 7 8 #include <linux/module.h> 9 #include <linux/delay.h> 10 #include <linux/dvb/frontend.h> 11 #include <linux/i2c.h> 12 #include <linux/slab.h> 13 14 #include <media/dvb_frontend.h> 15 16 #include "mt2131.h" 17 #include "mt2131_priv.h" 18 19 static int debug; 20 module_param(debug, int, 0644); 21 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off)."); 22 23 #define dprintk(level,fmt, arg...) if (debug >= level) \ 24 printk(KERN_INFO "%s: " fmt, "mt2131", ## arg) 25 26 static u8 mt2131_config1[] = { 27 0x01, 28 0x50, 0x00, 0x50, 0x80, 0x00, 0x49, 0xfa, 0x88, 29 0x08, 0x77, 0x41, 0x04, 0x00, 0x00, 0x00, 0x32, 30 0x7f, 0xda, 0x4c, 0x00, 0x10, 0xaa, 0x78, 0x80, 31 0xff, 0x68, 0xa0, 0xff, 0xdd, 0x00, 0x00 32 }; 33 34 static u8 mt2131_config2[] = { 35 0x10, 36 0x7f, 0xc8, 0x0a, 0x5f, 0x00, 0x04 37 }; 38 39 static int mt2131_readreg(struct mt2131_priv *priv, u8 reg, u8 *val) 40 { 41 struct i2c_msg msg[2] = { 42 { .addr = priv->cfg->i2c_address, .flags = 0, 43 .buf = ®, .len = 1 }, 44 { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, 45 .buf = val, .len = 1 }, 46 }; 47 48 if (i2c_transfer(priv->i2c, msg, 2) != 2) { 49 printk(KERN_WARNING "mt2131 I2C read failed\n"); 50 return -EREMOTEIO; 51 } 52 return 0; 53 } 54 55 static int mt2131_writereg(struct mt2131_priv *priv, u8 reg, u8 val) 56 { 57 u8 buf[2] = { reg, val }; 58 struct i2c_msg msg = { .addr = priv->cfg->i2c_address, .flags = 0, 59 .buf = buf, .len = 2 }; 60 61 if (i2c_transfer(priv->i2c, &msg, 1) != 1) { 62 printk(KERN_WARNING "mt2131 I2C write failed\n"); 63 return -EREMOTEIO; 64 } 65 return 0; 66 } 67 68 static int mt2131_writeregs(struct mt2131_priv *priv,u8 *buf, u8 len) 69 { 70 struct i2c_msg msg = { .addr = priv->cfg->i2c_address, 71 .flags = 0, .buf = buf, .len = len }; 72 73 if (i2c_transfer(priv->i2c, &msg, 1) != 1) { 74 printk(KERN_WARNING "mt2131 I2C write failed (len=%i)\n", 75 (int)len); 76 return -EREMOTEIO; 77 } 78 return 0; 79 } 80 81 static int mt2131_set_params(struct dvb_frontend *fe) 82 { 83 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 84 struct mt2131_priv *priv; 85 int ret=0, i; 86 u32 freq; 87 u8 if_band_center; 88 u32 f_lo1, f_lo2; 89 u32 div1, num1, div2, num2; 90 u8 b[8]; 91 u8 lockval = 0; 92 93 priv = fe->tuner_priv; 94 95 freq = c->frequency / 1000; /* Hz -> kHz */ 96 dprintk(1, "%s() freq=%d\n", __func__, freq); 97 98 f_lo1 = freq + MT2131_IF1 * 1000; 99 f_lo1 = (f_lo1 / 250) * 250; 100 f_lo2 = f_lo1 - freq - MT2131_IF2; 101 102 priv->frequency = (f_lo1 - f_lo2 - MT2131_IF2) * 1000; 103 104 /* Frequency LO1 = 16MHz * (DIV1 + NUM1/8192 ) */ 105 num1 = f_lo1 * 64 / (MT2131_FREF / 128); 106 div1 = num1 / 8192; 107 num1 &= 0x1fff; 108 109 /* Frequency LO2 = 16MHz * (DIV2 + NUM2/8192 ) */ 110 num2 = f_lo2 * 64 / (MT2131_FREF / 128); 111 div2 = num2 / 8192; 112 num2 &= 0x1fff; 113 114 if (freq <= 82500) if_band_center = 0x00; else 115 if (freq <= 137500) if_band_center = 0x01; else 116 if (freq <= 192500) if_band_center = 0x02; else 117 if (freq <= 247500) if_band_center = 0x03; else 118 if (freq <= 302500) if_band_center = 0x04; else 119 if (freq <= 357500) if_band_center = 0x05; else 120 if (freq <= 412500) if_band_center = 0x06; else 121 if (freq <= 467500) if_band_center = 0x07; else 122 if (freq <= 522500) if_band_center = 0x08; else 123 if (freq <= 577500) if_band_center = 0x09; else 124 if (freq <= 632500) if_band_center = 0x0A; else 125 if (freq <= 687500) if_band_center = 0x0B; else 126 if (freq <= 742500) if_band_center = 0x0C; else 127 if (freq <= 797500) if_band_center = 0x0D; else 128 if (freq <= 852500) if_band_center = 0x0E; else 129 if (freq <= 907500) if_band_center = 0x0F; else 130 if (freq <= 962500) if_band_center = 0x10; else 131 if (freq <= 1017500) if_band_center = 0x11; else 132 if (freq <= 1072500) if_band_center = 0x12; else if_band_center = 0x13; 133 134 b[0] = 1; 135 b[1] = (num1 >> 5) & 0xFF; 136 b[2] = (num1 & 0x1F); 137 b[3] = div1; 138 b[4] = (num2 >> 5) & 0xFF; 139 b[5] = num2 & 0x1F; 140 b[6] = div2; 141 142 dprintk(1, "IF1: %dMHz IF2: %dMHz\n", MT2131_IF1, MT2131_IF2); 143 dprintk(1, "PLL freq=%dkHz band=%d\n", (int)freq, (int)if_band_center); 144 dprintk(1, "PLL f_lo1=%dkHz f_lo2=%dkHz\n", (int)f_lo1, (int)f_lo2); 145 dprintk(1, "PLL div1=%d num1=%d div2=%d num2=%d\n", 146 (int)div1, (int)num1, (int)div2, (int)num2); 147 dprintk(1, "PLL [1..6]: %2x %2x %2x %2x %2x %2x\n", 148 (int)b[1], (int)b[2], (int)b[3], (int)b[4], (int)b[5], 149 (int)b[6]); 150 151 ret = mt2131_writeregs(priv,b,7); 152 if (ret < 0) 153 return ret; 154 155 mt2131_writereg(priv, 0x0b, if_band_center); 156 157 /* Wait for lock */ 158 i = 0; 159 do { 160 mt2131_readreg(priv, 0x08, &lockval); 161 if ((lockval & 0x88) == 0x88) 162 break; 163 msleep(4); 164 i++; 165 } while (i < 10); 166 167 return ret; 168 } 169 170 static int mt2131_get_frequency(struct dvb_frontend *fe, u32 *frequency) 171 { 172 struct mt2131_priv *priv = fe->tuner_priv; 173 dprintk(1, "%s()\n", __func__); 174 *frequency = priv->frequency; 175 return 0; 176 } 177 178 static int mt2131_get_status(struct dvb_frontend *fe, u32 *status) 179 { 180 struct mt2131_priv *priv = fe->tuner_priv; 181 u8 lock_status = 0; 182 u8 afc_status = 0; 183 184 *status = 0; 185 186 mt2131_readreg(priv, 0x08, &lock_status); 187 if ((lock_status & 0x88) == 0x88) 188 *status = TUNER_STATUS_LOCKED; 189 190 mt2131_readreg(priv, 0x09, &afc_status); 191 dprintk(1, "%s() - LO Status = 0x%x, AFC Status = 0x%x\n", 192 __func__, lock_status, afc_status); 193 194 return 0; 195 } 196 197 static int mt2131_init(struct dvb_frontend *fe) 198 { 199 struct mt2131_priv *priv = fe->tuner_priv; 200 int ret; 201 dprintk(1, "%s()\n", __func__); 202 203 if ((ret = mt2131_writeregs(priv, mt2131_config1, 204 sizeof(mt2131_config1))) < 0) 205 return ret; 206 207 mt2131_writereg(priv, 0x0b, 0x09); 208 mt2131_writereg(priv, 0x15, 0x47); 209 mt2131_writereg(priv, 0x07, 0xf2); 210 mt2131_writereg(priv, 0x0b, 0x01); 211 212 if ((ret = mt2131_writeregs(priv, mt2131_config2, 213 sizeof(mt2131_config2))) < 0) 214 return ret; 215 216 return ret; 217 } 218 219 static void mt2131_release(struct dvb_frontend *fe) 220 { 221 dprintk(1, "%s()\n", __func__); 222 kfree(fe->tuner_priv); 223 fe->tuner_priv = NULL; 224 } 225 226 static const struct dvb_tuner_ops mt2131_tuner_ops = { 227 .info = { 228 .name = "Microtune MT2131", 229 .frequency_min_hz = 48 * MHz, 230 .frequency_max_hz = 860 * MHz, 231 .frequency_step_hz = 50 * kHz, 232 }, 233 234 .release = mt2131_release, 235 .init = mt2131_init, 236 237 .set_params = mt2131_set_params, 238 .get_frequency = mt2131_get_frequency, 239 .get_status = mt2131_get_status 240 }; 241 242 struct dvb_frontend * mt2131_attach(struct dvb_frontend *fe, 243 struct i2c_adapter *i2c, 244 struct mt2131_config *cfg, u16 if1) 245 { 246 struct mt2131_priv *priv = NULL; 247 u8 id = 0; 248 249 dprintk(1, "%s()\n", __func__); 250 251 priv = kzalloc(sizeof(struct mt2131_priv), GFP_KERNEL); 252 if (priv == NULL) 253 return NULL; 254 255 priv->cfg = cfg; 256 priv->i2c = i2c; 257 258 if (mt2131_readreg(priv, 0, &id) != 0) { 259 kfree(priv); 260 return NULL; 261 } 262 if ( (id != 0x3E) && (id != 0x3F) ) { 263 printk(KERN_ERR "MT2131: Device not found at addr 0x%02x\n", 264 cfg->i2c_address); 265 kfree(priv); 266 return NULL; 267 } 268 269 printk(KERN_INFO "MT2131: successfully identified at address 0x%02x\n", 270 cfg->i2c_address); 271 memcpy(&fe->ops.tuner_ops, &mt2131_tuner_ops, 272 sizeof(struct dvb_tuner_ops)); 273 274 fe->tuner_priv = priv; 275 return fe; 276 } 277 EXPORT_SYMBOL_GPL(mt2131_attach); 278 279 MODULE_AUTHOR("Steven Toth"); 280 MODULE_DESCRIPTION("Microtune MT2131 silicon tuner driver"); 281 MODULE_LICENSE("GPL"); 282