drivers/media/dvb-frontends/zl10039.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Driver for Zarlink ZL10039 DVB-S tuner
   4  *
   5  *  Copyright 2007 Jan D. Louw <jd.louw@mweb.co.za>
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/string.h>
  11 #include <linux/slab.h>
  12 #include <linux/dvb/frontend.h>
  13
  14 #include <media/dvb_frontend.h>
  15 #include "zl10039.h"
  16
  17 static int debug;
  18
  19 /* Max transfer size done by I2C transfer functions */
  20 #define MAX_XFER_SIZE  64
  21
  22 #define dprintk(args...) \
  23         do { \
  24                 if (debug) \
  25                         printk(KERN_DEBUG args); \
  26         } while (0)
  27
  28 enum zl10039_model_id {
  29         ID_ZL10039 = 1
  30 };
  31
  32 struct zl10039_state {
  33         struct i2c_adapter *i2c;
  34         u8 i2c_addr;
  35         u8 id;
  36 };
  37
  38 enum zl10039_reg_addr {
  39         PLL0 = 0,
  40         PLL1,
  41         PLL2,
  42         PLL3,
  43         RFFE,
  44         BASE0,
  45         BASE1,
  46         BASE2,
  47         LO0,
  48         LO1,
  49         LO2,
  50         LO3,
  51         LO4,
  52         LO5,
  53         LO6,
  54         GENERAL
  55 };
  56
  57 static int zl10039_read(const struct zl10039_state *state,
  58                         const enum zl10039_reg_addr reg, u8 *buf,
  59                         const size_t count)
  60 {
  61         u8 regbuf[] = { reg };
  62         struct i2c_msg msg[] = {
  63                 {/* Write register address */
  64                         .addr = state->i2c_addr,
  65                         .flags = 0,
  66                         .buf = regbuf,
  67                         .len = 1,
  68                 }, {/* Read count bytes */
  69                         .addr = state->i2c_addr,
  70                         .flags = I2C_M_RD,
  71                         .buf = buf,
  72                         .len = count,
  73                 },
  74         };
  75
  76         dprintk("%s\n", __func__);
  77
  78         if (i2c_transfer(state->i2c, msg, 2) != 2) {
  79                 dprintk("%s: i2c read error\n", __func__);
  80                 return -EREMOTEIO;
  81         }
  82
  83         return 0; /* Success */
  84 }
  85
  86 static int zl10039_write(struct zl10039_state *state,
  87                         const enum zl10039_reg_addr reg, const u8 *src,
  88                         const size_t count)
  89 {
  90         u8 buf[MAX_XFER_SIZE];
  91         struct i2c_msg msg = {
  92                 .addr = state->i2c_addr,
  93                 .flags = 0,
  94                 .buf = buf,
  95                 .len = count + 1,
  96         };
  97
  98         if (1 + count > sizeof(buf)) {
  99                 printk(KERN_WARNING
 100                        "%s: i2c wr reg=%04x: len=%zu is too big!\n",
 101                        KBUILD_MODNAME, reg, count);
 102                 return -EINVAL;
 103         }
 104
 105         dprintk("%s\n", __func__);
 106         /* Write register address and data in one go */
 107         buf[0] = reg;
 108         memcpy(&buf[1], src, count);
 109         if (i2c_transfer(state->i2c, &msg, 1) != 1) {
 110                 dprintk("%s: i2c write error\n", __func__);
 111                 return -EREMOTEIO;
 112         }
 113
 114         return 0; /* Success */
 115 }
 116
 117 static inline int zl10039_readreg(struct zl10039_state *state,
 118                                 const enum zl10039_reg_addr reg, u8 *val)
 119 {
 120         return zl10039_read(state, reg, val, 1);
 121 }
 122
 123 static inline int zl10039_writereg(struct zl10039_state *state,
 124                                 const enum zl10039_reg_addr reg,
 125                                 const u8 val)
 126 {
 127         const u8 tmp = val; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
 128
 129         return zl10039_write(state, reg, &tmp, 1);
 130 }
 131
 132 static int zl10039_init(struct dvb_frontend *fe)
 133 {
 134         struct zl10039_state *state = fe->tuner_priv;
 135         int ret;
 136
 137         dprintk("%s\n", __func__);
 138         if (fe->ops.i2c_gate_ctrl)
 139                 fe->ops.i2c_gate_ctrl(fe, 1);
 140         /* Reset logic */
 141         ret = zl10039_writereg(state, GENERAL, 0x40);
 142         if (ret < 0) {
 143                 dprintk("Note: i2c write error normal when resetting the tuner\n");
 144         }
 145         /* Wake up */
 146         ret = zl10039_writereg(state, GENERAL, 0x01);
 147         if (ret < 0) {
 148                 dprintk("Tuner power up failed\n");
 149                 return ret;
 150         }
 151         if (fe->ops.i2c_gate_ctrl)
 152                 fe->ops.i2c_gate_ctrl(fe, 0);
 153
 154         return 0;
 155 }
 156
 157 static int zl10039_sleep(struct dvb_frontend *fe)
 158 {
 159         struct zl10039_state *state = fe->tuner_priv;
 160         int ret;
 161
 162         dprintk("%s\n", __func__);
 163         if (fe->ops.i2c_gate_ctrl)
 164                 fe->ops.i2c_gate_ctrl(fe, 1);
 165         ret = zl10039_writereg(state, GENERAL, 0x80);
 166         if (ret < 0) {
 167                 dprintk("Tuner sleep failed\n");
 168                 return ret;
 169         }
 170         if (fe->ops.i2c_gate_ctrl)
 171                 fe->ops.i2c_gate_ctrl(fe, 0);
 172
 173         return 0;
 174 }
 175
 176 static int zl10039_set_params(struct dvb_frontend *fe)
 177 {
 178         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 179         struct zl10039_state *state = fe->tuner_priv;
 180         u8 buf[6];
 181         u8 bf;
 182         u32 fbw;
 183         u32 div;
 184         int ret;
 185
 186         dprintk("%s\n", __func__);
 187         dprintk("Set frequency = %d, symbol rate = %d\n",
 188                         c->frequency, c->symbol_rate);
 189
 190         /* Assumed 10.111 MHz crystal oscillator */
 191         /* Cancelled num/den 80 to prevent overflow */
 192         div = (c->frequency * 1000) / 126387;
 193         fbw = (c->symbol_rate * 27) / 32000;
 194         /* Cancelled num/den 10 to prevent overflow */
 195         bf = ((fbw * 5088) / 1011100) - 1;
 196
 197         /*PLL divider*/
 198         buf[0] = (div >> 8) & 0x7f;
 199         buf[1] = (div >> 0) & 0xff;
 200         /*Reference divider*/
 201         /* Select reference ratio of 80 */
 202         buf[2] = 0x1D;
 203         /*PLL test modes*/
 204         buf[3] = 0x40;
 205         /*RF Control register*/
 206         buf[4] = 0x6E; /* Bypass enable */
 207         /*Baseband filter cutoff */
 208         buf[5] = bf;
 209
 210         /* Open i2c gate */
 211         if (fe->ops.i2c_gate_ctrl)
 212                 fe->ops.i2c_gate_ctrl(fe, 1);
 213         /* BR = 10, Enable filter adjustment */
 214         ret = zl10039_writereg(state, BASE1, 0x0A);
 215         if (ret < 0)
 216                 goto error;
 217         /* Write new config values */
 218         ret = zl10039_write(state, PLL0, buf, sizeof(buf));
 219         if (ret < 0)
 220                 goto error;
 221         /* BR = 10, Disable filter adjustment */
 222         ret = zl10039_writereg(state, BASE1, 0x6A);
 223         if (ret < 0)
 224                 goto error;
 225
 226         /* Close i2c gate */
 227         if (fe->ops.i2c_gate_ctrl)
 228                 fe->ops.i2c_gate_ctrl(fe, 0);
 229         return 0;
 230 error:
 231         dprintk("Error setting tuner\n");
 232         return ret;
 233 }
 234
 235 static void zl10039_release(struct dvb_frontend *fe)
 236 {
 237         struct zl10039_state *state = fe->tuner_priv;
 238
 239         dprintk("%s\n", __func__);
 240         kfree(state);
 241         fe->tuner_priv = NULL;
 242 }
 243
 244 static const struct dvb_tuner_ops zl10039_ops = {
 245         .release = zl10039_release,
 246         .init = zl10039_init,
 247         .sleep = zl10039_sleep,
 248         .set_params = zl10039_set_params,
 249 };
 250
 251 struct dvb_frontend *zl10039_attach(struct dvb_frontend *fe,
 252                 u8 i2c_addr, struct i2c_adapter *i2c)
 253 {
 254         struct zl10039_state *state = NULL;
 255
 256         dprintk("%s\n", __func__);
 257         state = kmalloc(sizeof(struct zl10039_state), GFP_KERNEL);
 258         if (state == NULL)
 259                 goto error;
 260
 261         state->i2c = i2c;
 262         state->i2c_addr = i2c_addr;
 263
 264         /* Open i2c gate */
 265         if (fe->ops.i2c_gate_ctrl)
 266                 fe->ops.i2c_gate_ctrl(fe, 1);
 267         /* check if this is a valid tuner */
 268         if (zl10039_readreg(state, GENERAL, &state->id) < 0) {
 269                 /* Close i2c gate */
 270                 if (fe->ops.i2c_gate_ctrl)
 271                         fe->ops.i2c_gate_ctrl(fe, 0);
 272                 goto error;
 273         }
 274         /* Close i2c gate */
 275         if (fe->ops.i2c_gate_ctrl)
 276                 fe->ops.i2c_gate_ctrl(fe, 0);
 277
 278         state->id = state->id & 0x0f;
 279         switch (state->id) {
 280         case ID_ZL10039:
 281                 strscpy(fe->ops.tuner_ops.info.name,
 282                         "Zarlink ZL10039 DVB-S tuner",
 283                         sizeof(fe->ops.tuner_ops.info.name));
 284                 break;
 285         default:
 286                 dprintk("Chip ID=%x does not match a known type\n", state->id);
 287                 goto error;
 288         }
 289
 290         memcpy(&fe->ops.tuner_ops, &zl10039_ops, sizeof(struct dvb_tuner_ops));
 291         fe->tuner_priv = state;
 292         dprintk("Tuner attached @ i2c address 0x%02x\n", i2c_addr);
 293         return fe;
 294 error:
 295         kfree(state);
 296         return NULL;
 297 }
 298 EXPORT_SYMBOL(zl10039_attach);
 299
 300 module_param(debug, int, 0644);
 301 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 302 MODULE_DESCRIPTION("Zarlink ZL10039 DVB-S tuner driver");
 303 MODULE_AUTHOR("Jan D. Louw <jd.louw@mweb.co.za>");
 304 MODULE_LICENSE("GPL");