drivers/media/tuners/si2157.c

   1 /*
   2  * Silicon Labs Si2157 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 /* execute firmware command */
  20 static int si2157_cmd_execute(struct si2157 *s, struct si2157_cmd *cmd)
  21 {
  22         int ret;
  23         unsigned long timeout;
  24
  25         mutex_lock(&s->i2c_mutex);
  26
  27         if (cmd->wlen) {
  28                 /* write cmd and args for firmware */
  29                 ret = i2c_master_send(s->client, cmd->args, cmd->wlen);
  30                 if (ret < 0) {
  31                         goto err_mutex_unlock;
  32                 } else if (ret != cmd->wlen) {
  33                         ret = -EREMOTEIO;
  34                         goto err_mutex_unlock;
  35                 }
  36         }
  37
  38         if (cmd->rlen) {
  39                 /* wait cmd execution terminate */
  40                 #define TIMEOUT 80
  41                 timeout = jiffies + msecs_to_jiffies(TIMEOUT);
  42                 while (!time_after(jiffies, timeout)) {
  43                         ret = i2c_master_recv(s->client, cmd->args, cmd->rlen);
  44                         if (ret < 0) {
  45                                 goto err_mutex_unlock;
  46                         } else if (ret != cmd->rlen) {
  47                                 ret = -EREMOTEIO;
  48                                 goto err_mutex_unlock;
  49                         }
  50
  51                         /* firmware ready? */
  52                         if ((cmd->args[0] >> 7) & 0x01)
  53                                 break;
  54                 }
  55
  56                 dev_dbg(&s->client->dev, "%s: cmd execution took %d ms\n",
  57                                 __func__,
  58                                 jiffies_to_msecs(jiffies) -
  59                                 (jiffies_to_msecs(timeout) - TIMEOUT));
  60
  61                 if (!((cmd->args[0] >> 7) & 0x01)) {
  62                         ret = -ETIMEDOUT;
  63                         goto err_mutex_unlock;
  64                 }
  65         }
  66
  67         ret = 0;
  68
  69 err_mutex_unlock:
  70         mutex_unlock(&s->i2c_mutex);
  71         if (ret)
  72                 goto err;
  73
  74         return 0;
  75 err:
  76         dev_dbg(&s->client->dev, "%s: failed=%d\n", __func__, ret);
  77         return ret;
  78 }
  79
  80 static int si2157_init(struct dvb_frontend *fe)
  81 {
  82         struct si2157 *s = fe->tuner_priv;
  83
  84         dev_dbg(&s->client->dev, "%s:\n", __func__);
  85
  86         s->active = true;
  87
  88         return 0;
  89 }
  90
  91 static int si2157_sleep(struct dvb_frontend *fe)
  92 {
  93         struct si2157 *s = fe->tuner_priv;
  94         int ret;
  95         struct si2157_cmd cmd;
  96
  97         dev_dbg(&s->client->dev, "%s:\n", __func__);
  98
  99         s->active = false;
 100
 101         memcpy(cmd.args, "\x13", 1);
 102         cmd.wlen = 1;
 103         cmd.rlen = 0;
 104         ret = si2157_cmd_execute(s, &cmd);
 105         if (ret)
 106                 goto err;
 107
 108         return 0;
 109 err:
 110         dev_dbg(&s->client->dev, "%s: failed=%d\n", __func__, ret);
 111         return ret;
 112 }
 113
 114 static int si2157_set_params(struct dvb_frontend *fe)
 115 {
 116         struct si2157 *s = fe->tuner_priv;
 117         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 118         int ret;
 119         struct si2157_cmd cmd;
 120
 121         dev_dbg(&s->client->dev,
 122                         "%s: delivery_system=%d frequency=%u bandwidth_hz=%u\n",
 123                         __func__, c->delivery_system, c->frequency,
 124                         c->bandwidth_hz);
 125
 126         if (!s->active) {
 127                 ret = -EAGAIN;
 128                 goto err;
 129         }
 130
 131         /* configure? */
 132         cmd.args[0] = 0xc0;
 133         cmd.args[1] = 0x00;
 134         cmd.args[2] = 0x0c;
 135         cmd.args[3] = 0x00;
 136         cmd.args[4] = 0x00;
 137         cmd.args[5] = 0x01;
 138         cmd.args[6] = 0x01;
 139         cmd.args[7] = 0x01;
 140         cmd.args[8] = 0x01;
 141         cmd.args[9] = 0x01;
 142         cmd.args[10] = 0x01;
 143         cmd.args[11] = 0x02;
 144         cmd.args[12] = 0x00;
 145         cmd.args[13] = 0x00;
 146         cmd.args[14] = 0x01;
 147         cmd.wlen = 15;
 148         cmd.rlen = 1;
 149         ret = si2157_cmd_execute(s, &cmd);
 150         if (ret)
 151                 goto err;
 152
 153         cmd.args[0] = 0x02;
 154         cmd.wlen = 1;
 155         cmd.rlen = 13;
 156         ret = si2157_cmd_execute(s, &cmd);
 157         if (ret)
 158                 goto err;
 159
 160         cmd.args[0] = 0x01;
 161         cmd.args[1] = 0x01;
 162         cmd.wlen = 2;
 163         cmd.rlen = 1;
 164         ret = si2157_cmd_execute(s, &cmd);
 165         if (ret)
 166                 goto err;
 167
 168         /* set frequency */
 169         cmd.args[0] = 0x41;
 170         cmd.args[1] = 0x00;
 171         cmd.args[2] = 0x00;
 172         cmd.args[3] = 0x00;
 173         cmd.args[4] = (c->frequency >>  0) & 0xff;
 174         cmd.args[5] = (c->frequency >>  8) & 0xff;
 175         cmd.args[6] = (c->frequency >> 16) & 0xff;
 176         cmd.args[7] = (c->frequency >> 24) & 0xff;
 177         cmd.wlen = 8;
 178         cmd.rlen = 1;
 179         ret = si2157_cmd_execute(s, &cmd);
 180         if (ret)
 181                 goto err;
 182
 183         return 0;
 184 err:
 185         dev_dbg(&s->client->dev, "%s: failed=%d\n", __func__, ret);
 186         return ret;
 187 }
 188
 189 static const struct dvb_tuner_ops si2157_tuner_ops = {
 190         .info = {
 191                 .name           = "Silicon Labs Si2157",
 192                 .frequency_min  = 110000000,
 193                 .frequency_max  = 862000000,
 194         },
 195
 196         .init = si2157_init,
 197         .sleep = si2157_sleep,
 198         .set_params = si2157_set_params,
 199 };
 200
 201 static int si2157_probe(struct i2c_client *client,
 202                 const struct i2c_device_id *id)
 203 {
 204         struct si2157_config *cfg = client->dev.platform_data;
 205         struct dvb_frontend *fe = cfg->fe;
 206         struct si2157 *s;
 207         struct si2157_cmd cmd;
 208         int ret;
 209
 210         s = kzalloc(sizeof(struct si2157), GFP_KERNEL);
 211         if (!s) {
 212                 ret = -ENOMEM;
 213                 dev_err(&client->dev, "%s: kzalloc() failed\n", KBUILD_MODNAME);
 214                 goto err;
 215         }
 216
 217         s->client = client;
 218         s->fe = cfg->fe;
 219         mutex_init(&s->i2c_mutex);
 220
 221         /* check if the tuner is there */
 222         cmd.wlen = 0;
 223         cmd.rlen = 1;
 224         ret = si2157_cmd_execute(s, &cmd);
 225         if (ret)
 226                 goto err;
 227
 228         fe->tuner_priv = s;
 229         memcpy(&fe->ops.tuner_ops, &si2157_tuner_ops,
 230                         sizeof(struct dvb_tuner_ops));
 231
 232         i2c_set_clientdata(client, s);
 233
 234         dev_info(&s->client->dev,
 235                         "%s: Silicon Labs Si2157 successfully attached\n",
 236                         KBUILD_MODNAME);
 237         return 0;
 238 err:
 239         dev_dbg(&client->dev, "%s: failed=%d\n", __func__, ret);
 240         kfree(s);
 241
 242         return ret;
 243 }
 244
 245 static int si2157_remove(struct i2c_client *client)
 246 {
 247         struct si2157 *s = i2c_get_clientdata(client);
 248         struct dvb_frontend *fe = s->fe;
 249
 250         dev_dbg(&client->dev, "%s:\n", __func__);
 251
 252         memset(&fe->ops.tuner_ops, 0, sizeof(struct dvb_tuner_ops));
 253         fe->tuner_priv = NULL;
 254         kfree(s);
 255
 256         return 0;
 257 }
 258
 259 static const struct i2c_device_id si2157_id[] = {
 260         {"si2157", 0},
 261         {}
 262 };
 263 MODULE_DEVICE_TABLE(i2c, si2157_id);
 264
 265 static struct i2c_driver si2157_driver = {
 266         .driver = {
 267                 .owner  = THIS_MODULE,
 268                 .name   = "si2157",
 269         },
 270         .probe          = si2157_probe,
 271         .remove         = si2157_remove,
 272         .id_table       = si2157_id,
 273 };
 274
 275 module_i2c_driver(si2157_driver);
 276
 277 MODULE_DESCRIPTION("Silicon Labs Si2157 silicon tuner driver");
 278 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 279 MODULE_LICENSE("GPL");