drivers/media/tuners/mt2131.c

   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 = &reg, .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(mt2131_attach);
 278
 279 MODULE_AUTHOR("Steven Toth");
 280 MODULE_DESCRIPTION("Microtune MT2131 silicon tuner driver");
 281 MODULE_LICENSE("GPL");