drivers/media/dvb/frontends/lgh06xf.c

   1 /*
   2  *  lgh06xf.c - ATSC Tuner support for LG TDVS-H06xF
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, write to the Free Software
  16  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 #include "dvb-pll.h"
  20 #include "lgh06xf.h"
  21
  22 #define LG_H06XF_PLL_I2C_ADDR 0x61
  23
  24 struct lgh06xf_priv {
  25         struct i2c_adapter *i2c;
  26         u32 frequency;
  27 };
  28
  29 static int lgh06xf_release(struct dvb_frontend *fe)
  30 {
  31         kfree(fe->tuner_priv);
  32         fe->tuner_priv = NULL;
  33         return 0;
  34 }
  35
  36 static int lgh06xf_set_params(struct dvb_frontend* fe,
  37                               struct dvb_frontend_parameters* params)
  38 {
  39         struct lgh06xf_priv *priv = fe->tuner_priv;
  40         u8 buf[4];
  41         struct i2c_msg msg = { .addr = LG_H06XF_PLL_I2C_ADDR, .flags = 0,
  42                                .buf = buf, .len = sizeof(buf) };
  43         u32 div;
  44         int i;
  45         int err;
  46
  47         dvb_pll_configure(&dvb_pll_lg_tdvs_h06xf, buf, params->frequency, 0);
  48         if (fe->ops.i2c_gate_ctrl)
  49                 fe->ops.i2c_gate_ctrl(fe, 1);
  50         if ((err = i2c_transfer(priv->i2c, &msg, 1)) != 1) {
  51                 printk(KERN_WARNING "lgh06xf: %s error "
  52                        "(addr %02x <- %02x, err = %i)\n",
  53                        __FUNCTION__, buf[0], buf[1], err);
  54                 if (err < 0)
  55                         return err;
  56                 else
  57                         return -EREMOTEIO;
  58         }
  59
  60         /* Set the Auxiliary Byte. */
  61         buf[0] = buf[2];
  62         buf[0] &= ~0x20;
  63         buf[0] |= 0x18;
  64         buf[1] = 0x50;
  65         msg.len = 2;
  66         if (fe->ops.i2c_gate_ctrl)
  67                 fe->ops.i2c_gate_ctrl(fe, 1);
  68         if ((err = i2c_transfer(priv->i2c, &msg, 1)) != 1) {
  69                 printk(KERN_WARNING "lgh06xf: %s error "
  70                        "(addr %02x <- %02x, err = %i)\n",
  71                        __FUNCTION__, buf[0], buf[1], err);
  72                 if (err < 0)
  73                         return err;
  74                 else
  75                         return -EREMOTEIO;
  76         }
  77
  78         // calculate the frequency we set it to
  79         for (i = 0; i < dvb_pll_lg_tdvs_h06xf.count; i++) {
  80                 if (params->frequency > dvb_pll_lg_tdvs_h06xf.entries[i].limit)
  81                         continue;
  82                 break;
  83         }
  84         div = (params->frequency + dvb_pll_lg_tdvs_h06xf.entries[i].offset) /
  85                 dvb_pll_lg_tdvs_h06xf.entries[i].stepsize;
  86         priv->frequency = (div * dvb_pll_lg_tdvs_h06xf.entries[i].stepsize) -
  87                 dvb_pll_lg_tdvs_h06xf.entries[i].offset;
  88
  89         return 0;
  90 }
  91
  92 static int lgh06xf_get_frequency(struct dvb_frontend *fe, u32 *frequency)
  93 {
  94         struct lgh06xf_priv *priv = fe->tuner_priv;
  95         *frequency = priv->frequency;
  96         return 0;
  97 }
  98
  99 static struct dvb_tuner_ops lgh06xf_tuner_ops = {
 100         .release       = lgh06xf_release,
 101         .set_params    = lgh06xf_set_params,
 102         .get_frequency = lgh06xf_get_frequency,
 103 };
 104
 105 struct dvb_frontend* lgh06xf_attach(struct dvb_frontend *fe,
 106                                     struct i2c_adapter *i2c)
 107 {
 108         struct lgh06xf_priv *priv = NULL;
 109
 110         priv = kzalloc(sizeof(struct lgh06xf_priv), GFP_KERNEL);
 111         if (priv == NULL)
 112                 return NULL;
 113
 114         priv->i2c = i2c;
 115
 116         memcpy(&fe->ops.tuner_ops, &lgh06xf_tuner_ops,
 117                sizeof(struct dvb_tuner_ops));
 118
 119         strlcpy(fe->ops.tuner_ops.info.name, dvb_pll_lg_tdvs_h06xf.name,
 120                 sizeof(fe->ops.tuner_ops.info.name));
 121
 122         fe->ops.tuner_ops.info.frequency_min = dvb_pll_lg_tdvs_h06xf.min;
 123         fe->ops.tuner_ops.info.frequency_max = dvb_pll_lg_tdvs_h06xf.max;
 124
 125         fe->tuner_priv = priv;
 126         return fe;
 127 }
 128
 129 EXPORT_SYMBOL(lgh06xf_attach);
 130
 131 MODULE_DESCRIPTION("LG TDVS-H06xF ATSC Tuner support");
 132 MODULE_AUTHOR("Michael Krufky");
 133 MODULE_LICENSE("GPL");
 134
 135 /*
 136  * Local variables:
 137  * c-basic-offset: 8
 138  * End:
 139  */