drivers/media/dvb/frontends/zl10039.c

   1 /*
   2  *  Driver for Zarlink ZL10039 DVB-S tuner
   3  *
   4  *  Copyright 2007 Jan D. Louw <jd.louw@mweb.co.za>
   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/init.h>
  24 #include <linux/string.h>
  25 #include <linux/slab.h>
  26 #include <linux/dvb/frontend.h>
  27
  28 #include "dvb_frontend.h"
  29 #include "zl10039.h"
  30
  31 static int debug;
  32
  33 #define dprintk(args...) \
  34         do { \
  35                 if (debug) \
  36                         printk(KERN_DEBUG args); \
  37         } while (0)
  38
  39 enum zl10039_model_id {
  40         ID_ZL10039 = 1
  41 };
  42
  43 struct zl10039_state {
  44         struct i2c_adapter *i2c;
  45         u8 i2c_addr;
  46         u8 id;
  47 };
  48
  49 enum zl10039_reg_addr {
  50         PLL0 = 0,
  51         PLL1,
  52         PLL2,
  53         PLL3,
  54         RFFE,
  55         BASE0,
  56         BASE1,
  57         BASE2,
  58         LO0,
  59         LO1,
  60         LO2,
  61         LO3,
  62         LO4,
  63         LO5,
  64         LO6,
  65         GENERAL
  66 };
  67
  68 static int zl10039_read(const struct zl10039_state *state,
  69                         const enum zl10039_reg_addr reg, u8 *buf,
  70                         const size_t count)
  71 {
  72         u8 regbuf[] = { reg };
  73         struct i2c_msg msg[] = {
  74                 {/* Write register address */
  75                         .addr = state->i2c_addr,
  76                         .flags = 0,
  77                         .buf = regbuf,
  78                         .len = 1,
  79                 }, {/* Read count bytes */
  80                         .addr = state->i2c_addr,
  81                         .flags = I2C_M_RD,
  82                         .buf = buf,
  83                         .len = count,
  84                 },
  85         };
  86
  87         dprintk("%s\n", __func__);
  88
  89         if (i2c_transfer(state->i2c, msg, 2) != 2) {
  90                 dprintk("%s: i2c read error\n", __func__);
  91                 return -EREMOTEIO;
  92         }
  93
  94         return 0; /* Success */
  95 }
  96
  97 static int zl10039_write(struct zl10039_state *state,
  98                         const enum zl10039_reg_addr reg, const u8 *src,
  99                         const size_t count)
 100 {
 101         u8 buf[count + 1];
 102         struct i2c_msg msg = {
 103                 .addr = state->i2c_addr,
 104                 .flags = 0,
 105                 .buf = buf,
 106                 .len = count + 1,
 107         };
 108
 109         dprintk("%s\n", __func__);
 110         /* Write register address and data in one go */
 111         buf[0] = reg;
 112         memcpy(&buf[1], src, count);
 113         if (i2c_transfer(state->i2c, &msg, 1) != 1) {
 114                 dprintk("%s: i2c write error\n", __func__);
 115                 return -EREMOTEIO;
 116         }
 117
 118         return 0; /* Success */
 119 }
 120
 121 static inline int zl10039_readreg(struct zl10039_state *state,
 122                                 const enum zl10039_reg_addr reg, u8 *val)
 123 {
 124         return zl10039_read(state, reg, val, 1);
 125 }
 126
 127 static inline int zl10039_writereg(struct zl10039_state *state,
 128                                 const enum zl10039_reg_addr reg,
 129                                 const u8 val)
 130 {
 131         return zl10039_write(state, reg, &val, 1);
 132 }
 133
 134 static int zl10039_init(struct dvb_frontend *fe)
 135 {
 136         struct zl10039_state *state = fe->tuner_priv;
 137         int ret;
 138
 139         dprintk("%s\n", __func__);
 140         if (fe->ops.i2c_gate_ctrl)
 141                 fe->ops.i2c_gate_ctrl(fe, 1);
 142         /* Reset logic */
 143         ret = zl10039_writereg(state, GENERAL, 0x40);
 144         if (ret < 0) {
 145                 dprintk("Note: i2c write error normal when resetting the "
 146                         "tuner\n");
 147         }
 148         /* Wake up */
 149         ret = zl10039_writereg(state, GENERAL, 0x01);
 150         if (ret < 0) {
 151                 dprintk("Tuner power up failed\n");
 152                 return ret;
 153         }
 154         if (fe->ops.i2c_gate_ctrl)
 155                 fe->ops.i2c_gate_ctrl(fe, 0);
 156
 157         return 0;
 158 }
 159
 160 static int zl10039_sleep(struct dvb_frontend *fe)
 161 {
 162         struct zl10039_state *state = fe->tuner_priv;
 163         int ret;
 164
 165         dprintk("%s\n", __func__);
 166         if (fe->ops.i2c_gate_ctrl)
 167                 fe->ops.i2c_gate_ctrl(fe, 1);
 168         ret = zl10039_writereg(state, GENERAL, 0x80);
 169         if (ret < 0) {
 170                 dprintk("Tuner sleep failed\n");
 171                 return ret;
 172         }
 173         if (fe->ops.i2c_gate_ctrl)
 174                 fe->ops.i2c_gate_ctrl(fe, 0);
 175
 176         return 0;
 177 }
 178
 179 static int zl10039_set_params(struct dvb_frontend *fe,
 180                         struct dvb_frontend_parameters *params)
 181 {
 182         struct zl10039_state *state = fe->tuner_priv;
 183         u8 buf[6];
 184         u8 bf;
 185         u32 fbw;
 186         u32 div;
 187         int ret;
 188
 189         dprintk("%s\n", __func__);
 190         dprintk("Set frequency = %d, symbol rate = %d\n",
 191                         params->frequency, params->u.qpsk.symbol_rate);
 192
 193         /* Assumed 10.111 MHz crystal oscillator */
 194         /* Cancelled num/den 80 to prevent overflow */
 195         div = (params->frequency * 1000) / 126387;
 196         fbw = (params->u.qpsk.symbol_rate * 27) / 32000;
 197         /* Cancelled num/den 10 to prevent overflow */
 198         bf = ((fbw * 5088) / 1011100) - 1;
 199
 200         /*PLL divider*/
 201         buf[0] = (div >> 8) & 0x7f;
 202         buf[1] = (div >> 0) & 0xff;
 203         /*Reference divider*/
 204         /* Select reference ratio of 80 */
 205         buf[2] = 0x1D;
 206         /*PLL test modes*/
 207         buf[3] = 0x40;
 208         /*RF Control register*/
 209         buf[4] = 0x6E; /* Bypass enable */
 210         /*Baseband filter cutoff */
 211         buf[5] = bf;
 212
 213         /* Open i2c gate */
 214         if (fe->ops.i2c_gate_ctrl)
 215                 fe->ops.i2c_gate_ctrl(fe, 1);
 216         /* BR = 10, Enable filter adjustment */
 217         ret = zl10039_writereg(state, BASE1, 0x0A);
 218         if (ret < 0)
 219                 goto error;
 220         /* Write new config values */
 221         ret = zl10039_write(state, PLL0, buf, sizeof(buf));
 222         if (ret < 0)
 223                 goto error;
 224         /* BR = 10, Disable filter adjustment */
 225         ret = zl10039_writereg(state, BASE1, 0x6A);
 226         if (ret < 0)
 227                 goto error;
 228
 229         /* Close i2c gate */
 230         if (fe->ops.i2c_gate_ctrl)
 231                 fe->ops.i2c_gate_ctrl(fe, 0);
 232         return 0;
 233 error:
 234         dprintk("Error setting tuner\n");
 235         return ret;
 236 }
 237
 238 static int zl10039_release(struct dvb_frontend *fe)
 239 {
 240         struct zl10039_state *state = fe->tuner_priv;
 241
 242         dprintk("%s\n", __func__);
 243         kfree(state);
 244         fe->tuner_priv = NULL;
 245         return 0;
 246 }
 247
 248 static struct dvb_tuner_ops zl10039_ops = {
 249         .release = zl10039_release,
 250         .init = zl10039_init,
 251         .sleep = zl10039_sleep,
 252         .set_params = zl10039_set_params,
 253 };
 254
 255 struct dvb_frontend *zl10039_attach(struct dvb_frontend *fe,
 256                 u8 i2c_addr, struct i2c_adapter *i2c)
 257 {
 258         struct zl10039_state *state = NULL;
 259
 260         dprintk("%s\n", __func__);
 261         state = kmalloc(sizeof(struct zl10039_state), GFP_KERNEL);
 262         if (state == NULL)
 263                 goto error;
 264
 265         state->i2c = i2c;
 266         state->i2c_addr = i2c_addr;
 267
 268         /* Open i2c gate */
 269         if (fe->ops.i2c_gate_ctrl)
 270                 fe->ops.i2c_gate_ctrl(fe, 1);
 271         /* check if this is a valid tuner */
 272         if (zl10039_readreg(state, GENERAL, &state->id) < 0) {
 273                 /* Close i2c gate */
 274                 if (fe->ops.i2c_gate_ctrl)
 275                         fe->ops.i2c_gate_ctrl(fe, 0);
 276                 goto error;
 277         }
 278         /* Close i2c gate */
 279         if (fe->ops.i2c_gate_ctrl)
 280                 fe->ops.i2c_gate_ctrl(fe, 0);
 281
 282         state->id = state->id & 0x0f;
 283         switch (state->id) {
 284         case ID_ZL10039:
 285                 strcpy(fe->ops.tuner_ops.info.name,
 286                         "Zarlink ZL10039 DVB-S tuner");
 287                 break;
 288         default:
 289                 dprintk("Chip ID=%x does not match a known type\n", state->id);
 290                 goto error;
 291         }
 292
 293         memcpy(&fe->ops.tuner_ops, &zl10039_ops, sizeof(struct dvb_tuner_ops));
 294         fe->tuner_priv = state;
 295         dprintk("Tuner attached @ i2c address 0x%02x\n", i2c_addr);
 296         return fe;
 297 error:
 298         kfree(state);
 299         return NULL;
 300 }
 301 EXPORT_SYMBOL(zl10039_attach);
 302
 303 module_param(debug, int, 0644);
 304 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 305 MODULE_DESCRIPTION("Zarlink ZL10039 DVB-S tuner driver");
 306 MODULE_AUTHOR("Jan D. Louw <jd.louw@mweb.co.za>");
 307 MODULE_LICENSE("GPL");