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
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/string.h>
  21 #include <linux/slab.h>
  22 #include <linux/dvb/frontend.h>
  23
  24 #include <media/dvb_frontend.h>
  25 #include "zl10039.h"
  26
  27 static int debug;
  28
  29 /* Max transfer size done by I2C transfer functions */
  30 #define MAX_XFER_SIZE  64
  31
  32 #define dprintk(args...) \
  33         do { \
  34                 if (debug) \
  35                         printk(KERN_DEBUG args); \
  36         } while (0)
  37
  38 enum zl10039_model_id {
  39         ID_ZL10039 = 1
  40 };
  41
  42 struct zl10039_state {
  43         struct i2c_adapter *i2c;
  44         u8 i2c_addr;
  45         u8 id;
  46 };
  47
  48 enum zl10039_reg_addr {
  49         PLL0 = 0,
  50         PLL1,
  51         PLL2,
  52         PLL3,
  53         RFFE,
  54         BASE0,
  55         BASE1,
  56         BASE2,
  57         LO0,
  58         LO1,
  59         LO2,
  60         LO3,
  61         LO4,
  62         LO5,
  63         LO6,
  64         GENERAL
  65 };
  66
  67 static int zl10039_read(const struct zl10039_state *state,
  68                         const enum zl10039_reg_addr reg, u8 *buf,
  69                         const size_t count)
  70 {
  71         u8 regbuf[] = { reg };
  72         struct i2c_msg msg[] = {
  73                 {/* Write register address */
  74                         .addr = state->i2c_addr,
  75                         .flags = 0,
  76                         .buf = regbuf,
  77                         .len = 1,
  78                 }, {/* Read count bytes */
  79                         .addr = state->i2c_addr,
  80                         .flags = I2C_M_RD,
  81                         .buf = buf,
  82                         .len = count,
  83                 },
  84         };
  85
  86         dprintk("%s\n", __func__);
  87
  88         if (i2c_transfer(state->i2c, msg, 2) != 2) {
  89                 dprintk("%s: i2c read error\n", __func__);
  90                 return -EREMOTEIO;
  91         }
  92
  93         return 0; /* Success */
  94 }
  95
  96 static int zl10039_write(struct zl10039_state *state,
  97                         const enum zl10039_reg_addr reg, const u8 *src,
  98                         const size_t count)
  99 {
 100         u8 buf[MAX_XFER_SIZE];
 101         struct i2c_msg msg = {
 102                 .addr = state->i2c_addr,
 103                 .flags = 0,
 104                 .buf = buf,
 105                 .len = count + 1,
 106         };
 107
 108         if (1 + count > sizeof(buf)) {
 109                 printk(KERN_WARNING
 110                        "%s: i2c wr reg=%04x: len=%zu is too big!\n",
 111                        KBUILD_MODNAME, reg, count);
 112                 return -EINVAL;
 113         }
 114
 115         dprintk("%s\n", __func__);
 116         /* Write register address and data in one go */
 117         buf[0] = reg;
 118         memcpy(&buf[1], src, count);
 119         if (i2c_transfer(state->i2c, &msg, 1) != 1) {
 120                 dprintk("%s: i2c write error\n", __func__);
 121                 return -EREMOTEIO;
 122         }
 123
 124         return 0; /* Success */
 125 }
 126
 127 static inline int zl10039_readreg(struct zl10039_state *state,
 128                                 const enum zl10039_reg_addr reg, u8 *val)
 129 {
 130         return zl10039_read(state, reg, val, 1);
 131 }
 132
 133 static inline int zl10039_writereg(struct zl10039_state *state,
 134                                 const enum zl10039_reg_addr reg,
 135                                 const u8 val)
 136 {
 137         const u8 tmp = val; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
 138
 139         return zl10039_write(state, reg, &tmp, 1);
 140 }
 141
 142 static int zl10039_init(struct dvb_frontend *fe)
 143 {
 144         struct zl10039_state *state = fe->tuner_priv;
 145         int ret;
 146
 147         dprintk("%s\n", __func__);
 148         if (fe->ops.i2c_gate_ctrl)
 149                 fe->ops.i2c_gate_ctrl(fe, 1);
 150         /* Reset logic */
 151         ret = zl10039_writereg(state, GENERAL, 0x40);
 152         if (ret < 0) {
 153                 dprintk("Note: i2c write error normal when resetting the tuner\n");
 154         }
 155         /* Wake up */
 156         ret = zl10039_writereg(state, GENERAL, 0x01);
 157         if (ret < 0) {
 158                 dprintk("Tuner power up failed\n");
 159                 return ret;
 160         }
 161         if (fe->ops.i2c_gate_ctrl)
 162                 fe->ops.i2c_gate_ctrl(fe, 0);
 163
 164         return 0;
 165 }
 166
 167 static int zl10039_sleep(struct dvb_frontend *fe)
 168 {
 169         struct zl10039_state *state = fe->tuner_priv;
 170         int ret;
 171
 172         dprintk("%s\n", __func__);
 173         if (fe->ops.i2c_gate_ctrl)
 174                 fe->ops.i2c_gate_ctrl(fe, 1);
 175         ret = zl10039_writereg(state, GENERAL, 0x80);
 176         if (ret < 0) {
 177                 dprintk("Tuner sleep failed\n");
 178                 return ret;
 179         }
 180         if (fe->ops.i2c_gate_ctrl)
 181                 fe->ops.i2c_gate_ctrl(fe, 0);
 182
 183         return 0;
 184 }
 185
 186 static int zl10039_set_params(struct dvb_frontend *fe)
 187 {
 188         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 189         struct zl10039_state *state = fe->tuner_priv;
 190         u8 buf[6];
 191         u8 bf;
 192         u32 fbw;
 193         u32 div;
 194         int ret;
 195
 196         dprintk("%s\n", __func__);
 197         dprintk("Set frequency = %d, symbol rate = %d\n",
 198                         c->frequency, c->symbol_rate);
 199
 200         /* Assumed 10.111 MHz crystal oscillator */
 201         /* Cancelled num/den 80 to prevent overflow */
 202         div = (c->frequency * 1000) / 126387;
 203         fbw = (c->symbol_rate * 27) / 32000;
 204         /* Cancelled num/den 10 to prevent overflow */
 205         bf = ((fbw * 5088) / 1011100) - 1;
 206
 207         /*PLL divider*/
 208         buf[0] = (div >> 8) & 0x7f;
 209         buf[1] = (div >> 0) & 0xff;
 210         /*Reference divider*/
 211         /* Select reference ratio of 80 */
 212         buf[2] = 0x1D;
 213         /*PLL test modes*/
 214         buf[3] = 0x40;
 215         /*RF Control register*/
 216         buf[4] = 0x6E; /* Bypass enable */
 217         /*Baseband filter cutoff */
 218         buf[5] = bf;
 219
 220         /* Open i2c gate */
 221         if (fe->ops.i2c_gate_ctrl)
 222                 fe->ops.i2c_gate_ctrl(fe, 1);
 223         /* BR = 10, Enable filter adjustment */
 224         ret = zl10039_writereg(state, BASE1, 0x0A);
 225         if (ret < 0)
 226                 goto error;
 227         /* Write new config values */
 228         ret = zl10039_write(state, PLL0, buf, sizeof(buf));
 229         if (ret < 0)
 230                 goto error;
 231         /* BR = 10, Disable filter adjustment */
 232         ret = zl10039_writereg(state, BASE1, 0x6A);
 233         if (ret < 0)
 234                 goto error;
 235
 236         /* Close i2c gate */
 237         if (fe->ops.i2c_gate_ctrl)
 238                 fe->ops.i2c_gate_ctrl(fe, 0);
 239         return 0;
 240 error:
 241         dprintk("Error setting tuner\n");
 242         return ret;
 243 }
 244
 245 static void zl10039_release(struct dvb_frontend *fe)
 246 {
 247         struct zl10039_state *state = fe->tuner_priv;
 248
 249         dprintk("%s\n", __func__);
 250         kfree(state);
 251         fe->tuner_priv = NULL;
 252 }
 253
 254 static const struct dvb_tuner_ops zl10039_ops = {
 255         .release = zl10039_release,
 256         .init = zl10039_init,
 257         .sleep = zl10039_sleep,
 258         .set_params = zl10039_set_params,
 259 };
 260
 261 struct dvb_frontend *zl10039_attach(struct dvb_frontend *fe,
 262                 u8 i2c_addr, struct i2c_adapter *i2c)
 263 {
 264         struct zl10039_state *state = NULL;
 265
 266         dprintk("%s\n", __func__);
 267         state = kmalloc(sizeof(struct zl10039_state), GFP_KERNEL);
 268         if (state == NULL)
 269                 goto error;
 270
 271         state->i2c = i2c;
 272         state->i2c_addr = i2c_addr;
 273
 274         /* Open i2c gate */
 275         if (fe->ops.i2c_gate_ctrl)
 276                 fe->ops.i2c_gate_ctrl(fe, 1);
 277         /* check if this is a valid tuner */
 278         if (zl10039_readreg(state, GENERAL, &state->id) < 0) {
 279                 /* Close i2c gate */
 280                 if (fe->ops.i2c_gate_ctrl)
 281                         fe->ops.i2c_gate_ctrl(fe, 0);
 282                 goto error;
 283         }
 284         /* Close i2c gate */
 285         if (fe->ops.i2c_gate_ctrl)
 286                 fe->ops.i2c_gate_ctrl(fe, 0);
 287
 288         state->id = state->id & 0x0f;
 289         switch (state->id) {
 290         case ID_ZL10039:
 291                 strscpy(fe->ops.tuner_ops.info.name,
 292                         "Zarlink ZL10039 DVB-S tuner",
 293                         sizeof(fe->ops.tuner_ops.info.name));
 294                 break;
 295         default:
 296                 dprintk("Chip ID=%x does not match a known type\n", state->id);
 297                 goto error;
 298         }
 299
 300         memcpy(&fe->ops.tuner_ops, &zl10039_ops, sizeof(struct dvb_tuner_ops));
 301         fe->tuner_priv = state;
 302         dprintk("Tuner attached @ i2c address 0x%02x\n", i2c_addr);
 303         return fe;
 304 error:
 305         kfree(state);
 306         return NULL;
 307 }
 308 EXPORT_SYMBOL(zl10039_attach);
 309
 310 module_param(debug, int, 0644);
 311 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 312 MODULE_DESCRIPTION("Zarlink ZL10039 DVB-S tuner driver");
 313 MODULE_AUTHOR("Jan D. Louw <jd.louw@mweb.co.za>");
 314 MODULE_LICENSE("GPL");