drivers/media/dvb-frontends/ix2505v.c

   1 /**
   2  * Driver for Sharp IX2505V (marked B0017) DVB-S silicon tuner
   3  *
   4  * Copyright (C) 2010 Malcolm Priestley
   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 Version 2, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/dvb/frontend.h>
  23 #include <linux/slab.h>
  24 #include <linux/types.h>
  25
  26 #include "ix2505v.h"
  27
  28 static int ix2505v_debug;
  29 #define dprintk(level, args...) do { \
  30         if (ix2505v_debug & level) \
  31                 printk(KERN_DEBUG "ix2505v: " args); \
  32 } while (0)
  33
  34 #define deb_info(args...)  dprintk(0x01, args)
  35 #define deb_i2c(args...)  dprintk(0x02, args)
  36
  37 struct ix2505v_state {
  38         struct i2c_adapter *i2c;
  39         const struct ix2505v_config *config;
  40         u32 frequency;
  41 };
  42
  43 /**
  44  *  Data read format of the Sharp IX2505V B0017
  45  *
  46  *  byte1:   1   |   1   |   0   |   0   |   0   |  MA1  |  MA0  |  1
  47  *  byte2:  POR  |   FL  |  RD2  |  RD1  |  RD0  |   X   |   X   |  X
  48  *
  49  *  byte1 = address
  50  *  byte2;
  51  *      POR = Power on Reset (VCC H=<2.2v L=>2.2v)
  52  *      FL  = Phase Lock (H=lock L=unlock)
  53  *      RD0-2 = Reserved internal operations
  54  *
  55  * Only POR can be used to check the tuner is present
  56  *
  57  * Caution: after byte2 the I2C reverts to write mode continuing to read
  58  *          may corrupt tuning data.
  59  *
  60  */
  61
  62 static int ix2505v_read_status_reg(struct ix2505v_state *state)
  63 {
  64         u8 addr = state->config->tuner_address;
  65         u8 b2[] = {0};
  66         int ret;
  67
  68         struct i2c_msg msg[1] = {
  69                 { .addr = addr, .flags = I2C_M_RD, .buf = b2, .len = 1 }
  70         };
  71
  72         ret = i2c_transfer(state->i2c, msg, 1);
  73         deb_i2c("Read %s ", __func__);
  74
  75         return (ret == 1) ? (int) b2[0] : -1;
  76 }
  77
  78 static int ix2505v_write(struct ix2505v_state *state, u8 buf[], u8 count)
  79 {
  80         struct i2c_msg msg[1] = {
  81                 { .addr = state->config->tuner_address, .flags = 0,
  82                   .buf = buf, .len = count },
  83         };
  84
  85         int ret;
  86
  87         ret = i2c_transfer(state->i2c, msg, 1);
  88
  89         if (ret != 1) {
  90                 deb_i2c("%s: i2c error, ret=%d\n", __func__, ret);
  91                 return -EIO;
  92         }
  93
  94         return 0;
  95 }
  96
  97 static int ix2505v_release(struct dvb_frontend *fe)
  98 {
  99         struct ix2505v_state *state = fe->tuner_priv;
 100
 101         fe->tuner_priv = NULL;
 102         kfree(state);
 103
 104         return 0;
 105 }
 106
 107 /**
 108  *  Data write format of the Sharp IX2505V B0017
 109  *
 110  *  byte1:   1   |   1   |   0   |   0   |   0   | 0(MA1)| 0(MA0)|  0
 111  *  byte2:   0   |  BG1  |  BG2  |   N8  |   N7  |   N6  |  N5   |  N4
 112  *  byte3:   N3  |   N2  |   N1  |   A5  |   A4  |   A3  |   A2  |  A1
 113  *  byte4:   1   | 1(C1) | 1(C0) |  PD5  |  PD4  |   TM  | 0(RTS)| 1(REF)
 114  *  byte5:   BA2 |   BA1 |  BA0  |  PSC  |  PD3  |PD2/TS2|DIV/TS1|PD0/TS0
 115  *
 116  *  byte1 = address
 117  *
 118  *  Write order
 119  *  1) byte1 -> byte2 -> byte3 -> byte4 -> byte5
 120  *  2) byte1 -> byte4 -> byte5 -> byte2 -> byte3
 121  *  3) byte1 -> byte2 -> byte3 -> byte4
 122  *  4) byte1 -> byte4 -> byte5 -> byte2
 123  *  5) byte1 -> byte2 -> byte3
 124  *  6) byte1 -> byte4 -> byte5
 125  *  7) byte1 -> byte2
 126  *  8) byte1 -> byte4
 127  *
 128  *  Recommended Setup
 129  *  1 -> 8 -> 6
 130  */
 131
 132 static int ix2505v_set_params(struct dvb_frontend *fe)
 133 {
 134         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 135         struct ix2505v_state *state = fe->tuner_priv;
 136         u32 frequency = c->frequency;
 137         u32 b_w  = (c->symbol_rate * 27) / 32000;
 138         u32 div_factor, N , A, x;
 139         int ret = 0, len;
 140         u8 gain, cc, ref, psc, local_osc, lpf;
 141         u8 data[4] = {0};
 142
 143         if ((frequency < fe->ops.info.frequency_min)
 144         ||  (frequency > fe->ops.info.frequency_max))
 145                 return -EINVAL;
 146
 147         if (state->config->tuner_gain)
 148                 gain = (state->config->tuner_gain < 4)
 149                         ? state->config->tuner_gain : 0;
 150         else
 151                 gain = 0x0;
 152
 153         if (state->config->tuner_chargepump)
 154                 cc = state->config->tuner_chargepump;
 155         else
 156                 cc = 0x3;
 157
 158         ref = 8; /* REF =1 */
 159         psc = 32; /* PSC = 0 */
 160
 161         div_factor = (frequency * ref) / 40; /* local osc = 4Mhz */
 162         x = div_factor / psc;
 163         N = x/100;
 164         A = ((x - (N * 100)) * psc) / 100;
 165
 166         data[0] = ((gain & 0x3) << 5) | (N >> 3);
 167         data[1] = (N << 5) | (A & 0x1f);
 168         data[2] = 0x81 | ((cc & 0x3) << 5) ; /*PD5,PD4 & TM = 0|C1,C0|REF=1*/
 169
 170         deb_info("Frq=%d x=%d N=%d A=%d\n", frequency, x, N, A);
 171
 172         if (frequency <= 1065000)
 173                 local_osc = (6 << 5) | 2;
 174         else if (frequency <= 1170000)
 175                 local_osc = (7 << 5) | 2;
 176         else if (frequency <= 1300000)
 177                 local_osc = (1 << 5);
 178         else if (frequency <= 1445000)
 179                 local_osc = (2 << 5);
 180         else if (frequency <= 1607000)
 181                 local_osc = (3 << 5);
 182         else if (frequency <= 1778000)
 183                 local_osc = (4 << 5);
 184         else if (frequency <= 1942000)
 185                 local_osc = (5 << 5);
 186         else            /*frequency up to 2150000*/
 187                 local_osc = (6 << 5);
 188
 189         data[3] = local_osc; /* all other bits set 0 */
 190
 191         if (b_w <= 10000)
 192                 lpf = 0xc;
 193         else if (b_w <= 12000)
 194                 lpf = 0x2;
 195         else if (b_w <= 14000)
 196                 lpf = 0xa;
 197         else if (b_w <= 16000)
 198                 lpf = 0x6;
 199         else if (b_w <= 18000)
 200                 lpf = 0xe;
 201         else if (b_w <= 20000)
 202                 lpf = 0x1;
 203         else if (b_w <= 22000)
 204                 lpf = 0x9;
 205         else if (b_w <= 24000)
 206                 lpf = 0x5;
 207         else if (b_w <= 26000)
 208                 lpf = 0xd;
 209         else if (b_w <= 28000)
 210                 lpf = 0x3;
 211                 else
 212                 lpf = 0xb;
 213
 214         deb_info("Osc=%x b_w=%x lpf=%x\n", local_osc, b_w, lpf);
 215         deb_info("Data 0=[%4phN]\n", data);
 216
 217         if (fe->ops.i2c_gate_ctrl)
 218                 fe->ops.i2c_gate_ctrl(fe, 1);
 219
 220         len = sizeof(data);
 221         ret |= ix2505v_write(state, data, len);
 222
 223         data[2] |= 0x4; /* set TM = 1 other bits same */
 224
 225         if (fe->ops.i2c_gate_ctrl)
 226                 fe->ops.i2c_gate_ctrl(fe, 1);
 227
 228         len = 1;
 229         ret |= ix2505v_write(state, &data[2], len); /* write byte 4 only */
 230
 231         msleep(10);
 232
 233         data[2] |= ((lpf >> 2) & 0x3) << 3; /* lpf */
 234         data[3] |= (lpf & 0x3) << 2;
 235
 236         deb_info("Data 2=[%x%x]\n", data[2], data[3]);
 237
 238         if (fe->ops.i2c_gate_ctrl)
 239                 fe->ops.i2c_gate_ctrl(fe, 1);
 240
 241         len = 2;
 242         ret |= ix2505v_write(state, &data[2], len); /* write byte 4 & 5 */
 243
 244         if (state->config->min_delay_ms)
 245                 msleep(state->config->min_delay_ms);
 246
 247         state->frequency = frequency;
 248
 249         return ret;
 250 }
 251
 252 static int ix2505v_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 253 {
 254         struct ix2505v_state *state = fe->tuner_priv;
 255
 256         *frequency = state->frequency;
 257
 258         return 0;
 259 }
 260
 261 static struct dvb_tuner_ops ix2505v_tuner_ops = {
 262         .info = {
 263                 .name = "Sharp IX2505V (B0017)",
 264                 .frequency_min = 950000,
 265                 .frequency_max = 2175000
 266         },
 267         .release = ix2505v_release,
 268         .set_params = ix2505v_set_params,
 269         .get_frequency = ix2505v_get_frequency,
 270 };
 271
 272 struct dvb_frontend *ix2505v_attach(struct dvb_frontend *fe,
 273                                     const struct ix2505v_config *config,
 274                                     struct i2c_adapter *i2c)
 275 {
 276         struct ix2505v_state *state = NULL;
 277         int ret;
 278
 279         if (NULL == config) {
 280                 deb_i2c("%s: no config ", __func__);
 281                 goto error;
 282         }
 283
 284         state = kzalloc(sizeof(struct ix2505v_state), GFP_KERNEL);
 285         if (NULL == state)
 286                 return NULL;
 287
 288         state->config = config;
 289         state->i2c = i2c;
 290
 291         if (state->config->tuner_write_only) {
 292                 if (fe->ops.i2c_gate_ctrl)
 293                         fe->ops.i2c_gate_ctrl(fe, 1);
 294
 295                 ret = ix2505v_read_status_reg(state);
 296
 297                 if (ret & 0x80) {
 298                         deb_i2c("%s: No IX2505V found\n", __func__);
 299                         goto error;
 300                 }
 301
 302                 if (fe->ops.i2c_gate_ctrl)
 303                         fe->ops.i2c_gate_ctrl(fe, 0);
 304         }
 305
 306         fe->tuner_priv = state;
 307
 308         memcpy(&fe->ops.tuner_ops, &ix2505v_tuner_ops,
 309                 sizeof(struct dvb_tuner_ops));
 310         deb_i2c("%s: initialization (%s addr=0x%02x) ok\n",
 311                 __func__, fe->ops.tuner_ops.info.name, config->tuner_address);
 312
 313         return fe;
 314
 315 error:
 316         kfree(state);
 317         return NULL;
 318 }
 319 EXPORT_SYMBOL(ix2505v_attach);
 320
 321 module_param_named(debug, ix2505v_debug, int, 0644);
 322 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 323 MODULE_DESCRIPTION("DVB IX2505V tuner driver");
 324 MODULE_AUTHOR("Malcolm Priestley");
 325 MODULE_LICENSE("GPL");