root/drivers/media/dvb-frontends/ix2505v.c

DEFINITIONS

1. ix2505v_read_status_reg
2. ix2505v_write
3. ix2505v_release
4. ix2505v_set_params
5. ix2505v_get_frequency
6. ix2505v_attach

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Driver for Sharp IX2505V (marked B0017) DVB-S silicon tuner
   4  *
   5  * Copyright (C) 2010 Malcolm Priestley
   6  */
   7 
   8 #include <linux/module.h>
   9 #include <linux/dvb/frontend.h>
  10 #include <linux/slab.h>
  11 #include <linux/types.h>
  12 
  13 #include "ix2505v.h"
  14 
  15 static int ix2505v_debug;
  16 #define dprintk(level, args...) do { \
  17         if (ix2505v_debug & level) \
  18                 printk(KERN_DEBUG "ix2505v: " args); \
  19 } while (0)
  20 
  21 #define deb_info(args...)  dprintk(0x01, args)
  22 #define deb_i2c(args...)  dprintk(0x02, args)
  23 
  24 struct ix2505v_state {
  25         struct i2c_adapter *i2c;
  26         const struct ix2505v_config *config;
  27         u32 frequency;
  28 };
  29 
  30 /*
  31  *  Data read format of the Sharp IX2505V B0017
  32  *
  33  *  byte1:   1   |   1   |   0   |   0   |   0   |  MA1  |  MA0  |  1
  34  *  byte2:  POR  |   FL  |  RD2  |  RD1  |  RD0  |   X   |   X   |  X
  35  *
  36  *  byte1 = address
  37  *  byte2;
  38  *      POR = Power on Reset (VCC H=<2.2v L=>2.2v)
  39  *      FL  = Phase Lock (H=lock L=unlock)
  40  *      RD0-2 = Reserved internal operations
  41  *
  42  * Only POR can be used to check the tuner is present
  43  *
  44  * Caution: after byte2 the I2C reverts to write mode continuing to read
  45  *          may corrupt tuning data.
  46  *
  47  */
  48 
  49 static int ix2505v_read_status_reg(struct ix2505v_state *state)
  50 {
  51         u8 addr = state->config->tuner_address;
  52         u8 b2[] = {0};
  53         int ret;
  54 
  55         struct i2c_msg msg[1] = {
  56                 { .addr = addr, .flags = I2C_M_RD, .buf = b2, .len = 1 }
  57         };
  58 
  59         ret = i2c_transfer(state->i2c, msg, 1);
  60         deb_i2c("Read %s ", __func__);
  61 
  62         return (ret == 1) ? (int) b2[0] : -1;
  63 }
  64 
  65 static int ix2505v_write(struct ix2505v_state *state, u8 buf[], u8 count)
  66 {
  67         struct i2c_msg msg[1] = {
  68                 { .addr = state->config->tuner_address, .flags = 0,
  69                   .buf = buf, .len = count },
  70         };
  71 
  72         int ret;
  73 
  74         ret = i2c_transfer(state->i2c, msg, 1);
  75 
  76         if (ret != 1) {
  77                 deb_i2c("%s: i2c error, ret=%d\n", __func__, ret);
  78                 return -EIO;
  79         }
  80 
  81         return 0;
  82 }
  83 
  84 static void ix2505v_release(struct dvb_frontend *fe)
  85 {
  86         struct ix2505v_state *state = fe->tuner_priv;
  87 
  88         fe->tuner_priv = NULL;
  89         kfree(state);
  90 
  91 }
  92 
  93 /*
  94  *  Data write format of the Sharp IX2505V B0017
  95  *
  96  *  byte1:   1   |   1   |   0   |   0   |   0   | 0(MA1)| 0(MA0)|  0
  97  *  byte2:   0   |  BG1  |  BG2  |   N8  |   N7  |   N6  |  N5   |  N4
  98  *  byte3:   N3  |   N2  |   N1  |   A5  |   A4  |   A3  |   A2  |  A1
  99  *  byte4:   1   | 1(C1) | 1(C0) |  PD5  |  PD4  |   TM  | 0(RTS)| 1(REF)
 100  *  byte5:   BA2 |   BA1 |  BA0  |  PSC  |  PD3  |PD2/TS2|DIV/TS1|PD0/TS0
 101  *
 102  *  byte1 = address
 103  *
 104  *  Write order
 105  *  1) byte1 -> byte2 -> byte3 -> byte4 -> byte5
 106  *  2) byte1 -> byte4 -> byte5 -> byte2 -> byte3
 107  *  3) byte1 -> byte2 -> byte3 -> byte4
 108  *  4) byte1 -> byte4 -> byte5 -> byte2
 109  *  5) byte1 -> byte2 -> byte3
 110  *  6) byte1 -> byte4 -> byte5
 111  *  7) byte1 -> byte2
 112  *  8) byte1 -> byte4
 113  *
 114  *  Recommended Setup
 115  *  1 -> 8 -> 6
 116  */
 117 
 118 static int ix2505v_set_params(struct dvb_frontend *fe)
 119 {
 120         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 121         struct ix2505v_state *state = fe->tuner_priv;
 122         u32 frequency = c->frequency;
 123         u32 b_w  = (c->symbol_rate * 27) / 32000;
 124         u32 div_factor, N , A, x;
 125         int ret = 0, len;
 126         u8 gain, cc, ref, psc, local_osc, lpf;
 127         u8 data[4] = {0};
 128 
 129         if ((frequency < fe->ops.info.frequency_min_hz / kHz)
 130         ||  (frequency > fe->ops.info.frequency_max_hz / kHz))
 131                 return -EINVAL;
 132 
 133         if (state->config->tuner_gain)
 134                 gain = (state->config->tuner_gain < 4)
 135                         ? state->config->tuner_gain : 0;
 136         else
 137                 gain = 0x0;
 138 
 139         if (state->config->tuner_chargepump)
 140                 cc = state->config->tuner_chargepump;
 141         else
 142                 cc = 0x3;
 143 
 144         ref = 8; /* REF =1 */
 145         psc = 32; /* PSC = 0 */
 146 
 147         div_factor = (frequency * ref) / 40; /* local osc = 4Mhz */
 148         x = div_factor / psc;
 149         N = x/100;
 150         A = ((x - (N * 100)) * psc) / 100;
 151 
 152         data[0] = ((gain & 0x3) << 5) | (N >> 3);
 153         data[1] = (N << 5) | (A & 0x1f);
 154         data[2] = 0x81 | ((cc & 0x3) << 5) ; /*PD5,PD4 & TM = 0|C1,C0|REF=1*/
 155 
 156         deb_info("Frq=%d x=%d N=%d A=%d\n", frequency, x, N, A);
 157 
 158         if (frequency <= 1065000)
 159                 local_osc = (6 << 5) | 2;
 160         else if (frequency <= 1170000)
 161                 local_osc = (7 << 5) | 2;
 162         else if (frequency <= 1300000)
 163                 local_osc = (1 << 5);
 164         else if (frequency <= 1445000)
 165                 local_osc = (2 << 5);
 166         else if (frequency <= 1607000)
 167                 local_osc = (3 << 5);
 168         else if (frequency <= 1778000)
 169                 local_osc = (4 << 5);
 170         else if (frequency <= 1942000)
 171                 local_osc = (5 << 5);
 172         else            /*frequency up to 2150000*/
 173                 local_osc = (6 << 5);
 174 
 175         data[3] = local_osc; /* all other bits set 0 */
 176 
 177         if (b_w <= 10000)
 178                 lpf = 0xc;
 179         else if (b_w <= 12000)
 180                 lpf = 0x2;
 181         else if (b_w <= 14000)
 182                 lpf = 0xa;
 183         else if (b_w <= 16000)
 184                 lpf = 0x6;
 185         else if (b_w <= 18000)
 186                 lpf = 0xe;
 187         else if (b_w <= 20000)
 188                 lpf = 0x1;
 189         else if (b_w <= 22000)
 190                 lpf = 0x9;
 191         else if (b_w <= 24000)
 192                 lpf = 0x5;
 193         else if (b_w <= 26000)
 194                 lpf = 0xd;
 195         else if (b_w <= 28000)
 196                 lpf = 0x3;
 197                 else
 198                 lpf = 0xb;
 199 
 200         deb_info("Osc=%x b_w=%x lpf=%x\n", local_osc, b_w, lpf);
 201         deb_info("Data 0=[%4phN]\n", data);
 202 
 203         if (fe->ops.i2c_gate_ctrl)
 204                 fe->ops.i2c_gate_ctrl(fe, 1);
 205 
 206         len = sizeof(data);
 207         ret |= ix2505v_write(state, data, len);
 208 
 209         data[2] |= 0x4; /* set TM = 1 other bits same */
 210 
 211         if (fe->ops.i2c_gate_ctrl)
 212                 fe->ops.i2c_gate_ctrl(fe, 1);
 213 
 214         len = 1;
 215         ret |= ix2505v_write(state, &data[2], len); /* write byte 4 only */
 216 
 217         msleep(10);
 218 
 219         data[2] |= ((lpf >> 2) & 0x3) << 3; /* lpf */
 220         data[3] |= (lpf & 0x3) << 2;
 221 
 222         deb_info("Data 2=[%x%x]\n", data[2], data[3]);
 223 
 224         if (fe->ops.i2c_gate_ctrl)
 225                 fe->ops.i2c_gate_ctrl(fe, 1);
 226 
 227         len = 2;
 228         ret |= ix2505v_write(state, &data[2], len); /* write byte 4 & 5 */
 229 
 230         if (state->config->min_delay_ms)
 231                 msleep(state->config->min_delay_ms);
 232 
 233         state->frequency = frequency;
 234 
 235         return ret;
 236 }
 237 
 238 static int ix2505v_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 239 {
 240         struct ix2505v_state *state = fe->tuner_priv;
 241 
 242         *frequency = state->frequency;
 243 
 244         return 0;
 245 }
 246 
 247 static const struct dvb_tuner_ops ix2505v_tuner_ops = {
 248         .info = {
 249                 .name = "Sharp IX2505V (B0017)",
 250                 .frequency_min_hz =  950 * MHz,
 251                 .frequency_max_hz = 2175 * MHz
 252         },
 253         .release = ix2505v_release,
 254         .set_params = ix2505v_set_params,
 255         .get_frequency = ix2505v_get_frequency,
 256 };
 257 
 258 struct dvb_frontend *ix2505v_attach(struct dvb_frontend *fe,
 259                                     const struct ix2505v_config *config,
 260                                     struct i2c_adapter *i2c)
 261 {
 262         struct ix2505v_state *state = NULL;
 263         int ret;
 264 
 265         if (NULL == config) {
 266                 deb_i2c("%s: no config ", __func__);
 267                 goto error;
 268         }
 269 
 270         state = kzalloc(sizeof(struct ix2505v_state), GFP_KERNEL);
 271         if (NULL == state)
 272                 return NULL;
 273 
 274         state->config = config;
 275         state->i2c = i2c;
 276 
 277         if (state->config->tuner_write_only) {
 278                 if (fe->ops.i2c_gate_ctrl)
 279                         fe->ops.i2c_gate_ctrl(fe, 1);
 280 
 281                 ret = ix2505v_read_status_reg(state);
 282 
 283                 if (ret & 0x80) {
 284                         deb_i2c("%s: No IX2505V found\n", __func__);
 285                         goto error;
 286                 }
 287 
 288                 if (fe->ops.i2c_gate_ctrl)
 289                         fe->ops.i2c_gate_ctrl(fe, 0);
 290         }
 291 
 292         fe->tuner_priv = state;
 293 
 294         memcpy(&fe->ops.tuner_ops, &ix2505v_tuner_ops,
 295                 sizeof(struct dvb_tuner_ops));
 296         deb_i2c("%s: initialization (%s addr=0x%02x) ok\n",
 297                 __func__, fe->ops.tuner_ops.info.name, config->tuner_address);
 298 
 299         return fe;
 300 
 301 error:
 302         kfree(state);
 303         return NULL;
 304 }
 305 EXPORT_SYMBOL(ix2505v_attach);
 306 
 307 module_param_named(debug, ix2505v_debug, int, 0644);
 308 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 309 MODULE_DESCRIPTION("DVB IX2505V tuner driver");
 310 MODULE_AUTHOR("Malcolm Priestley");
 311 MODULE_LICENSE("GPL");