drivers/media/dvb-frontends/stb6000.c

   1   /*
   2      Driver for ST STB6000 DVBS Silicon tuner
   3
   4      Copyright (C) 2008 Igor M. Liplianin (liplianin@me.by)
   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
  15      GNU General Public License for more details.
  16
  17      You should have received a copy of the GNU General Public License
  18      along with this program; if not, write to the Free Software
  19      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21   */
  22
  23 #include <linux/slab.h>
  24 #include <linux/module.h>
  25 #include <linux/dvb/frontend.h>
  26 #include <asm/types.h>
  27
  28 #include "stb6000.h"
  29
  30 static int debug;
  31 #define dprintk(args...) \
  32         do { \
  33                 if (debug) \
  34                         printk(KERN_DEBUG "stb6000: " args); \
  35         } while (0)
  36
  37 struct stb6000_priv {
  38         /* i2c details */
  39         int i2c_address;
  40         struct i2c_adapter *i2c;
  41         u32 frequency;
  42 };
  43
  44 static void stb6000_release(struct dvb_frontend *fe)
  45 {
  46         kfree(fe->tuner_priv);
  47         fe->tuner_priv = NULL;
  48 }
  49
  50 static int stb6000_sleep(struct dvb_frontend *fe)
  51 {
  52         struct stb6000_priv *priv = fe->tuner_priv;
  53         int ret;
  54         u8 buf[] = { 10, 0 };
  55         struct i2c_msg msg = {
  56                 .addr = priv->i2c_address,
  57                 .flags = 0,
  58                 .buf = buf,
  59                 .len = 2
  60         };
  61
  62         dprintk("%s:\n", __func__);
  63
  64         if (fe->ops.i2c_gate_ctrl)
  65                 fe->ops.i2c_gate_ctrl(fe, 1);
  66
  67         ret = i2c_transfer(priv->i2c, &msg, 1);
  68         if (ret != 1)
  69                 dprintk("%s: i2c error\n", __func__);
  70
  71         if (fe->ops.i2c_gate_ctrl)
  72                 fe->ops.i2c_gate_ctrl(fe, 0);
  73
  74         return (ret == 1) ? 0 : ret;
  75 }
  76
  77 static int stb6000_set_params(struct dvb_frontend *fe)
  78 {
  79         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
  80         struct stb6000_priv *priv = fe->tuner_priv;
  81         unsigned int n, m;
  82         int ret;
  83         u32 freq_mhz;
  84         int bandwidth;
  85         u8 buf[12];
  86         struct i2c_msg msg = {
  87                 .addr = priv->i2c_address,
  88                 .flags = 0,
  89                 .buf = buf,
  90                 .len = 12
  91         };
  92
  93         dprintk("%s:\n", __func__);
  94
  95         freq_mhz = p->frequency / 1000;
  96         bandwidth = p->symbol_rate / 1000000;
  97
  98         if (bandwidth > 31)
  99                 bandwidth = 31;
 100
 101         if ((freq_mhz > 949) && (freq_mhz < 2151)) {
 102                 buf[0] = 0x01;
 103                 buf[1] = 0xac;
 104                 if (freq_mhz < 1950)
 105                         buf[1] = 0xaa;
 106                 if (freq_mhz < 1800)
 107                         buf[1] = 0xa8;
 108                 if (freq_mhz < 1650)
 109                         buf[1] = 0xa6;
 110                 if (freq_mhz < 1530)
 111                         buf[1] = 0xa5;
 112                 if (freq_mhz < 1470)
 113                         buf[1] = 0xa4;
 114                 if (freq_mhz < 1370)
 115                         buf[1] = 0xa2;
 116                 if (freq_mhz < 1300)
 117                         buf[1] = 0xa1;
 118                 if (freq_mhz < 1200)
 119                         buf[1] = 0xa0;
 120                 if (freq_mhz < 1075)
 121                         buf[1] = 0xbc;
 122                 if (freq_mhz < 1000)
 123                         buf[1] = 0xba;
 124                 if (freq_mhz < 1075) {
 125                         n = freq_mhz / 8; /* vco=lo*4 */
 126                         m = 2;
 127                 } else {
 128                         n = freq_mhz / 16; /* vco=lo*2 */
 129                         m = 1;
 130                 }
 131                 buf[2] = n >> 1;
 132                 buf[3] = (unsigned char)(((n & 1) << 7) |
 133                                         (m * freq_mhz - n * 16) | 0x60);
 134                 buf[4] = 0x04;
 135                 buf[5] = 0x0e;
 136
 137                 buf[6] = (unsigned char)(bandwidth);
 138
 139                 buf[7] = 0xd8;
 140                 buf[8] = 0xd0;
 141                 buf[9] = 0x50;
 142                 buf[10] = 0xeb;
 143                 buf[11] = 0x4f;
 144
 145                 if (fe->ops.i2c_gate_ctrl)
 146                         fe->ops.i2c_gate_ctrl(fe, 1);
 147
 148                 ret = i2c_transfer(priv->i2c, &msg, 1);
 149                 if (ret != 1)
 150                         dprintk("%s: i2c error\n", __func__);
 151
 152                 udelay(10);
 153                 if (fe->ops.i2c_gate_ctrl)
 154                         fe->ops.i2c_gate_ctrl(fe, 0);
 155
 156                 buf[0] = 0x07;
 157                 buf[1] = 0xdf;
 158                 buf[2] = 0xd0;
 159                 buf[3] = 0x50;
 160                 buf[4] = 0xfb;
 161                 msg.len = 5;
 162
 163                 if (fe->ops.i2c_gate_ctrl)
 164                         fe->ops.i2c_gate_ctrl(fe, 1);
 165
 166                 ret = i2c_transfer(priv->i2c, &msg, 1);
 167                 if (ret != 1)
 168                         dprintk("%s: i2c error\n", __func__);
 169
 170                 udelay(10);
 171                 if (fe->ops.i2c_gate_ctrl)
 172                         fe->ops.i2c_gate_ctrl(fe, 0);
 173
 174                 priv->frequency = freq_mhz * 1000;
 175
 176                 return (ret == 1) ? 0 : ret;
 177         }
 178         return -1;
 179 }
 180
 181 static int stb6000_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 182 {
 183         struct stb6000_priv *priv = fe->tuner_priv;
 184         *frequency = priv->frequency;
 185         return 0;
 186 }
 187
 188 static const struct dvb_tuner_ops stb6000_tuner_ops = {
 189         .info = {
 190                 .name = "ST STB6000",
 191                 .frequency_min = 950000,
 192                 .frequency_max = 2150000
 193         },
 194         .release = stb6000_release,
 195         .sleep = stb6000_sleep,
 196         .set_params = stb6000_set_params,
 197         .get_frequency = stb6000_get_frequency,
 198 };
 199
 200 struct dvb_frontend *stb6000_attach(struct dvb_frontend *fe, int addr,
 201                                                 struct i2c_adapter *i2c)
 202 {
 203         struct stb6000_priv *priv = NULL;
 204         u8 b0[] = { 0 };
 205         u8 b1[] = { 0, 0 };
 206         struct i2c_msg msg[2] = {
 207                 {
 208                         .addr = addr,
 209                         .flags = 0,
 210                         .buf = b0,
 211                         .len = 0
 212                 }, {
 213                         .addr = addr,
 214                         .flags = I2C_M_RD,
 215                         .buf = b1,
 216                         .len = 2
 217                 }
 218         };
 219         int ret;
 220
 221         dprintk("%s:\n", __func__);
 222
 223         if (fe->ops.i2c_gate_ctrl)
 224                 fe->ops.i2c_gate_ctrl(fe, 1);
 225
 226         /* is some i2c device here ? */
 227         ret = i2c_transfer(i2c, msg, 2);
 228         if (fe->ops.i2c_gate_ctrl)
 229                 fe->ops.i2c_gate_ctrl(fe, 0);
 230
 231         if (ret != 2)
 232                 return NULL;
 233
 234         priv = kzalloc(sizeof(struct stb6000_priv), GFP_KERNEL);
 235         if (priv == NULL)
 236                 return NULL;
 237
 238         priv->i2c_address = addr;
 239         priv->i2c = i2c;
 240
 241         memcpy(&fe->ops.tuner_ops, &stb6000_tuner_ops,
 242                                 sizeof(struct dvb_tuner_ops));
 243
 244         fe->tuner_priv = priv;
 245
 246         return fe;
 247 }
 248 EXPORT_SYMBOL(stb6000_attach);
 249
 250 module_param(debug, int, 0644);
 251 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 252
 253 MODULE_DESCRIPTION("DVB STB6000 driver");
 254 MODULE_AUTHOR("Igor M. Liplianin <liplianin@me.by>");
 255 MODULE_LICENSE("GPL");