drivers/media/dvb/frontends/lnbp21.c

   1 /*
   2  * lnbp21.c - driver for lnb supply and control ic lnbp21
   3  *
   4  * Copyright (C) 2006 Oliver Endriss
   5  * Copyright (C) 2009 Igor M. Liplianin <liplianin@netup.ru>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your option) any later version.
  11  *
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
  23  *
  24  *
  25  * the project's page is at http://www.linuxtv.org
  26  */
  27 #include <linux/delay.h>
  28 #include <linux/errno.h>
  29 #include <linux/init.h>
  30 #include <linux/kernel.h>
  31 #include <linux/module.h>
  32 #include <linux/string.h>
  33 #include <linux/slab.h>
  34
  35 #include "dvb_frontend.h"
  36 #include "lnbp21.h"
  37 #include "lnbh24.h"
  38
  39 struct lnbp21 {
  40         u8                      config;
  41         u8                      override_or;
  42         u8                      override_and;
  43         struct i2c_adapter      *i2c;
  44         u8                      i2c_addr;
  45 };
  46
  47 static int lnbp21_set_voltage(struct dvb_frontend *fe,
  48                                         fe_sec_voltage_t voltage)
  49 {
  50         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
  51         struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
  52                                 .buf = &lnbp21->config,
  53                                 .len = sizeof(lnbp21->config) };
  54
  55         lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN);
  56
  57         switch(voltage) {
  58         case SEC_VOLTAGE_OFF:
  59                 break;
  60         case SEC_VOLTAGE_13:
  61                 lnbp21->config |= LNBP21_EN;
  62                 break;
  63         case SEC_VOLTAGE_18:
  64                 lnbp21->config |= (LNBP21_EN | LNBP21_VSEL);
  65                 break;
  66         default:
  67                 return -EINVAL;
  68         };
  69
  70         lnbp21->config |= lnbp21->override_or;
  71         lnbp21->config &= lnbp21->override_and;
  72
  73         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
  74 }
  75
  76 static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  77 {
  78         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
  79         struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
  80                                 .buf = &lnbp21->config,
  81                                 .len = sizeof(lnbp21->config) };
  82
  83         if (arg)
  84                 lnbp21->config |= LNBP21_LLC;
  85         else
  86                 lnbp21->config &= ~LNBP21_LLC;
  87
  88         lnbp21->config |= lnbp21->override_or;
  89         lnbp21->config &= lnbp21->override_and;
  90
  91         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
  92 }
  93
  94 static void lnbp21_release(struct dvb_frontend *fe)
  95 {
  96         /* LNBP power off */
  97         lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF);
  98
  99         /* free data */
 100         kfree(fe->sec_priv);
 101         fe->sec_priv = NULL;
 102 }
 103
 104 static struct dvb_frontend *lnbx2x_attach(struct dvb_frontend *fe,
 105                                 struct i2c_adapter *i2c, u8 override_set,
 106                                 u8 override_clear, u8 i2c_addr, u8 config)
 107 {
 108         struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL);
 109         if (!lnbp21)
 110                 return NULL;
 111
 112         /* default configuration */
 113         lnbp21->config = config;
 114         lnbp21->i2c = i2c;
 115         lnbp21->i2c_addr = i2c_addr;
 116         fe->sec_priv = lnbp21;
 117
 118         /* bits which should be forced to '1' */
 119         lnbp21->override_or = override_set;
 120
 121         /* bits which should be forced to '0' */
 122         lnbp21->override_and = ~override_clear;
 123
 124         /* detect if it is present or not */
 125         if (lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 126                 kfree(lnbp21);
 127                 return NULL;
 128         }
 129
 130         /* install release callback */
 131         fe->ops.release_sec = lnbp21_release;
 132
 133         /* override frontend ops */
 134         fe->ops.set_voltage = lnbp21_set_voltage;
 135         fe->ops.enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage;
 136         printk(KERN_INFO "LNBx2x attached on addr=%x", lnbp21->i2c_addr);
 137
 138         return fe;
 139 }
 140
 141 struct dvb_frontend *lnbh24_attach(struct dvb_frontend *fe,
 142                                 struct i2c_adapter *i2c, u8 override_set,
 143                                 u8 override_clear, u8 i2c_addr)
 144 {
 145         return lnbx2x_attach(fe, i2c, override_set, override_clear,
 146                                                         i2c_addr, LNBH24_TTX);
 147 }
 148 EXPORT_SYMBOL(lnbh24_attach);
 149
 150 struct dvb_frontend *lnbp21_attach(struct dvb_frontend *fe,
 151                                 struct i2c_adapter *i2c, u8 override_set,
 152                                 u8 override_clear)
 153 {
 154         return lnbx2x_attach(fe, i2c, override_set, override_clear,
 155                                                         0x08, LNBP21_ISEL);
 156 }
 157 EXPORT_SYMBOL(lnbp21_attach);
 158
 159 MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp21, lnbh24");
 160 MODULE_AUTHOR("Oliver Endriss, Igor M. Liplianin");
 161 MODULE_LICENSE("GPL");