drivers/media/tuners/si2157.c

   1 /*
   2  * Silicon Labs Si2157/2158 silicon tuner driver
   3  *
   4  * Copyright (C) 2014 Antti Palosaari <crope@iki.fi>
   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  *    GNU General Public License for more details.
  15  */
  16
  17 #include "si2157_priv.h"
  18
  19 static const struct dvb_tuner_ops si2157_ops;
  20
  21 /* execute firmware command */
  22 static int si2157_cmd_execute(struct si2157 *s, struct si2157_cmd *cmd)
  23 {
  24         int ret;
  25         unsigned long timeout;
  26
  27         mutex_lock(&s->i2c_mutex);
  28
  29         if (cmd->wlen) {
  30                 /* write cmd and args for firmware */
  31                 ret = i2c_master_send(s->client, cmd->args, cmd->wlen);
  32                 if (ret < 0) {
  33                         goto err_mutex_unlock;
  34                 } else if (ret != cmd->wlen) {
  35                         ret = -EREMOTEIO;
  36                         goto err_mutex_unlock;
  37                 }
  38         }
  39
  40         if (cmd->rlen) {
  41                 /* wait cmd execution terminate */
  42                 #define TIMEOUT 80
  43                 timeout = jiffies + msecs_to_jiffies(TIMEOUT);
  44                 while (!time_after(jiffies, timeout)) {
  45                         ret = i2c_master_recv(s->client, cmd->args, cmd->rlen);
  46                         if (ret < 0) {
  47                                 goto err_mutex_unlock;
  48                         } else if (ret != cmd->rlen) {
  49                                 ret = -EREMOTEIO;
  50                                 goto err_mutex_unlock;
  51                         }
  52
  53                         /* firmware ready? */
  54                         if ((cmd->args[0] >> 7) & 0x01)
  55                                 break;
  56                 }
  57
  58                 dev_dbg(&s->client->dev, "%s: cmd execution took %d ms\n",
  59                                 __func__,
  60                                 jiffies_to_msecs(jiffies) -
  61                                 (jiffies_to_msecs(timeout) - TIMEOUT));
  62
  63                 if (!((cmd->args[0] >> 7) & 0x01)) {
  64                         ret = -ETIMEDOUT;
  65                         goto err_mutex_unlock;
  66                 }
  67         }
  68
  69         ret = 0;
  70
  71 err_mutex_unlock:
  72         mutex_unlock(&s->i2c_mutex);
  73         if (ret)
  74                 goto err;
  75
  76         return 0;
  77 err:
  78         dev_dbg(&s->client->dev, "%s: failed=%d\n", __func__, ret);
  79         return ret;
  80 }
  81
  82 static int si2157_init(struct dvb_frontend *fe)
  83 {
  84         struct si2157 *s = fe->tuner_priv;
  85         int ret, len, remaining;
  86         struct si2157_cmd cmd;
  87         const struct firmware *fw = NULL;
  88         u8 *fw_file;
  89         unsigned int chip_id;
  90
  91         dev_dbg(&s->client->dev, "%s:\n", __func__);
  92
  93         /* configure? */
  94         memcpy(cmd.args, "\xc0\x00\x0c\x00\x00\x01\x01\x01\x01\x01\x01\x02\x00\x00\x01", 15);
  95         cmd.wlen = 15;
  96         cmd.rlen = 1;
  97         ret = si2157_cmd_execute(s, &cmd);
  98         if (ret)
  99                 goto err;
 100
 101         /* query chip revision */
 102         memcpy(cmd.args, "\x02", 1);
 103         cmd.wlen = 1;
 104         cmd.rlen = 13;
 105         ret = si2157_cmd_execute(s, &cmd);
 106         if (ret)
 107                 goto err;
 108
 109         chip_id = cmd.args[1] << 24 | cmd.args[2] << 16 | cmd.args[3] << 8 |
 110                         cmd.args[4] << 0;
 111
 112         #define SI2158_A20 ('A' << 24 | 58 << 16 | '2' << 8 | '0' << 0)
 113         #define SI2157_A30 ('A' << 24 | 57 << 16 | '3' << 8 | '0' << 0)
 114
 115         switch (chip_id) {
 116         case SI2158_A20:
 117                 fw_file = SI2158_A20_FIRMWARE;
 118                 break;
 119         case SI2157_A30:
 120                 goto skip_fw_download;
 121                 break;
 122         default:
 123                 dev_err(&s->client->dev,
 124                                 "%s: unkown chip version Si21%d-%c%c%c\n",
 125                                 KBUILD_MODNAME, cmd.args[2], cmd.args[1],
 126                                 cmd.args[3], cmd.args[4]);
 127                 ret = -EINVAL;
 128                 goto err;
 129         }
 130
 131         /* cold state - try to download firmware */
 132         dev_info(&s->client->dev, "%s: found a '%s' in cold state\n",
 133                         KBUILD_MODNAME, si2157_ops.info.name);
 134
 135         /* request the firmware, this will block and timeout */
 136         ret = request_firmware(&fw, fw_file, &s->client->dev);
 137         if (ret) {
 138                 dev_err(&s->client->dev, "%s: firmware file '%s' not found\n",
 139                                 KBUILD_MODNAME, fw_file);
 140                 goto err;
 141         }
 142
 143         /* firmware should be n chunks of 17 bytes */
 144         if (fw->size % 17 != 0) {
 145                 dev_err(&s->client->dev, "%s: firmware file '%s' is invalid\n",
 146                                 KBUILD_MODNAME, fw_file);
 147                 ret = -EINVAL;
 148                 goto err;
 149         }
 150
 151         dev_info(&s->client->dev, "%s: downloading firmware from file '%s'\n",
 152                         KBUILD_MODNAME, fw_file);
 153
 154         for (remaining = fw->size; remaining > 0; remaining -= 17) {
 155                 len = fw->data[fw->size - remaining];
 156                 memcpy(cmd.args, &fw->data[(fw->size - remaining) + 1], len);
 157                 cmd.wlen = len;
 158                 cmd.rlen = 1;
 159                 ret = si2157_cmd_execute(s, &cmd);
 160                 if (ret) {
 161                         dev_err(&s->client->dev,
 162                                         "%s: firmware download failed=%d\n",
 163                                         KBUILD_MODNAME, ret);
 164                         goto err;
 165                 }
 166         }
 167
 168         release_firmware(fw);
 169         fw = NULL;
 170
 171 skip_fw_download:
 172         /* reboot the tuner with new firmware? */
 173         memcpy(cmd.args, "\x01\x01", 2);
 174         cmd.wlen = 2;
 175         cmd.rlen = 1;
 176         ret = si2157_cmd_execute(s, &cmd);
 177         if (ret)
 178                 goto err;
 179
 180         s->active = true;
 181
 182         return 0;
 183 err:
 184         if (fw)
 185                 release_firmware(fw);
 186
 187         dev_dbg(&s->client->dev, "%s: failed=%d\n", __func__, ret);
 188         return ret;
 189 }
 190
 191 static int si2157_sleep(struct dvb_frontend *fe)
 192 {
 193         struct si2157 *s = fe->tuner_priv;
 194         int ret;
 195         struct si2157_cmd cmd;
 196
 197         dev_dbg(&s->client->dev, "%s:\n", __func__);
 198
 199         s->active = false;
 200
 201         memcpy(cmd.args, "\x13", 1);
 202         cmd.wlen = 1;
 203         cmd.rlen = 0;
 204         ret = si2157_cmd_execute(s, &cmd);
 205         if (ret)
 206                 goto err;
 207
 208         return 0;
 209 err:
 210         dev_dbg(&s->client->dev, "%s: failed=%d\n", __func__, ret);
 211         return ret;
 212 }
 213
 214 static int si2157_set_params(struct dvb_frontend *fe)
 215 {
 216         struct si2157 *s = fe->tuner_priv;
 217         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 218         int ret;
 219         struct si2157_cmd cmd;
 220         u8 bandwidth, delivery_system;
 221
 222         dev_dbg(&s->client->dev,
 223                         "%s: delivery_system=%d frequency=%u bandwidth_hz=%u\n",
 224                         __func__, c->delivery_system, c->frequency,
 225                         c->bandwidth_hz);
 226
 227         if (!s->active) {
 228                 ret = -EAGAIN;
 229                 goto err;
 230         }
 231
 232         if (c->bandwidth_hz <= 6000000)
 233                 bandwidth = 0x06;
 234         else if (c->bandwidth_hz <= 7000000)
 235                 bandwidth = 0x07;
 236         else if (c->bandwidth_hz <= 8000000)
 237                 bandwidth = 0x08;
 238         else
 239                 bandwidth = 0x0f;
 240
 241         switch (c->delivery_system) {
 242         case SYS_DVBT:
 243         case SYS_DVBT2: /* it seems DVB-T and DVB-T2 both are 0x20 here */
 244                         delivery_system = 0x20;
 245                         break;
 246         case SYS_DVBC_ANNEX_A:
 247                         delivery_system = 0x30;
 248                         break;
 249         default:
 250                         ret = -EINVAL;
 251                         goto err;
 252         }
 253
 254         memcpy(cmd.args, "\x14\x00\x03\x07\x00\x00", 6);
 255         cmd.args[4] = delivery_system | bandwidth;
 256         cmd.wlen = 6;
 257         cmd.rlen = 1;
 258         ret = si2157_cmd_execute(s, &cmd);
 259         if (ret)
 260                 goto err;
 261
 262         /* set frequency */
 263         memcpy(cmd.args, "\x41\x00\x00\x00\x00\x00\x00\x00", 8);
 264         cmd.args[4] = (c->frequency >>  0) & 0xff;
 265         cmd.args[5] = (c->frequency >>  8) & 0xff;
 266         cmd.args[6] = (c->frequency >> 16) & 0xff;
 267         cmd.args[7] = (c->frequency >> 24) & 0xff;
 268         cmd.wlen = 8;
 269         cmd.rlen = 1;
 270         ret = si2157_cmd_execute(s, &cmd);
 271         if (ret)
 272                 goto err;
 273
 274         return 0;
 275 err:
 276         dev_dbg(&s->client->dev, "%s: failed=%d\n", __func__, ret);
 277         return ret;
 278 }
 279
 280 static const struct dvb_tuner_ops si2157_ops = {
 281         .info = {
 282                 .name           = "Silicon Labs Si2157/Si2158",
 283                 .frequency_min  = 110000000,
 284                 .frequency_max  = 862000000,
 285         },
 286
 287         .init = si2157_init,
 288         .sleep = si2157_sleep,
 289         .set_params = si2157_set_params,
 290 };
 291
 292 static int si2157_probe(struct i2c_client *client,
 293                 const struct i2c_device_id *id)
 294 {
 295         struct si2157_config *cfg = client->dev.platform_data;
 296         struct dvb_frontend *fe = cfg->fe;
 297         struct si2157 *s;
 298         struct si2157_cmd cmd;
 299         int ret;
 300
 301         s = kzalloc(sizeof(struct si2157), GFP_KERNEL);
 302         if (!s) {
 303                 ret = -ENOMEM;
 304                 dev_err(&client->dev, "%s: kzalloc() failed\n", KBUILD_MODNAME);
 305                 goto err;
 306         }
 307
 308         s->client = client;
 309         s->fe = cfg->fe;
 310         mutex_init(&s->i2c_mutex);
 311
 312         /* check if the tuner is there */
 313         cmd.wlen = 0;
 314         cmd.rlen = 1;
 315         ret = si2157_cmd_execute(s, &cmd);
 316         if (ret)
 317                 goto err;
 318
 319         fe->tuner_priv = s;
 320         memcpy(&fe->ops.tuner_ops, &si2157_ops,
 321                         sizeof(struct dvb_tuner_ops));
 322
 323         i2c_set_clientdata(client, s);
 324
 325         dev_info(&s->client->dev,
 326                         "%s: Silicon Labs Si2157/Si2158 successfully attached\n",
 327                         KBUILD_MODNAME);
 328         return 0;
 329 err:
 330         dev_dbg(&client->dev, "%s: failed=%d\n", __func__, ret);
 331         kfree(s);
 332
 333         return ret;
 334 }
 335
 336 static int si2157_remove(struct i2c_client *client)
 337 {
 338         struct si2157 *s = i2c_get_clientdata(client);
 339         struct dvb_frontend *fe = s->fe;
 340
 341         dev_dbg(&client->dev, "%s:\n", __func__);
 342
 343         memset(&fe->ops.tuner_ops, 0, sizeof(struct dvb_tuner_ops));
 344         fe->tuner_priv = NULL;
 345         kfree(s);
 346
 347         return 0;
 348 }
 349
 350 static const struct i2c_device_id si2157_id[] = {
 351         {"si2157", 0},
 352         {}
 353 };
 354 MODULE_DEVICE_TABLE(i2c, si2157_id);
 355
 356 static struct i2c_driver si2157_driver = {
 357         .driver = {
 358                 .owner  = THIS_MODULE,
 359                 .name   = "si2157",
 360         },
 361         .probe          = si2157_probe,
 362         .remove         = si2157_remove,
 363         .id_table       = si2157_id,
 364 };
 365
 366 module_i2c_driver(si2157_driver);
 367
 368 MODULE_DESCRIPTION("Silicon Labs Si2157/Si2158 silicon tuner driver");
 369 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 370 MODULE_LICENSE("GPL");
 371 MODULE_FIRMWARE(SI2158_A20_FIRMWARE);