drivers/media/dvb-frontends/lnbp21.c

   1 /*
   2  * lnbp21.c - driver for lnb supply and control ic lnbp21
   3  *
   4  * Copyright (C) 2006, 2009 Oliver Endriss <o.endriss@gmx.de>
   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  * To obtain the license, point your browser to
  19  * http://www.gnu.org/copyleft/gpl.html
  20  *
  21  *
  22  * the project's page is at https://linuxtv.org
  23  */
  24 #include <linux/delay.h>
  25 #include <linux/errno.h>
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/string.h>
  30 #include <linux/slab.h>
  31
  32 #include <media/dvb_frontend.h>
  33 #include "lnbp21.h"
  34 #include "lnbh24.h"
  35
  36 struct lnbp21 {
  37         u8                      config;
  38         u8                      override_or;
  39         u8                      override_and;
  40         struct i2c_adapter      *i2c;
  41         u8                      i2c_addr;
  42 };
  43
  44 static int lnbp21_set_voltage(struct dvb_frontend *fe,
  45                               enum fe_sec_voltage voltage)
  46 {
  47         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
  48         struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
  49                                 .buf = &lnbp21->config,
  50                                 .len = sizeof(lnbp21->config) };
  51
  52         lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN);
  53
  54         switch(voltage) {
  55         case SEC_VOLTAGE_OFF:
  56                 break;
  57         case SEC_VOLTAGE_13:
  58                 lnbp21->config |= LNBP21_EN;
  59                 break;
  60         case SEC_VOLTAGE_18:
  61                 lnbp21->config |= (LNBP21_EN | LNBP21_VSEL);
  62                 break;
  63         default:
  64                 return -EINVAL;
  65         }
  66
  67         lnbp21->config |= lnbp21->override_or;
  68         lnbp21->config &= lnbp21->override_and;
  69
  70         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
  71 }
  72
  73 static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  74 {
  75         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
  76         struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
  77                                 .buf = &lnbp21->config,
  78                                 .len = sizeof(lnbp21->config) };
  79
  80         if (arg)
  81                 lnbp21->config |= LNBP21_LLC;
  82         else
  83                 lnbp21->config &= ~LNBP21_LLC;
  84
  85         lnbp21->config |= lnbp21->override_or;
  86         lnbp21->config &= lnbp21->override_and;
  87
  88         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
  89 }
  90
  91 static int lnbp21_set_tone(struct dvb_frontend *fe,
  92                            enum fe_sec_tone_mode tone)
  93 {
  94         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
  95         struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
  96                                 .buf = &lnbp21->config,
  97                                 .len = sizeof(lnbp21->config) };
  98
  99         switch (tone) {
 100         case SEC_TONE_OFF:
 101                 lnbp21->config &= ~LNBP21_TEN;
 102                 break;
 103         case SEC_TONE_ON:
 104                 lnbp21->config |= LNBP21_TEN;
 105                 break;
 106         default:
 107                 return -EINVAL;
 108         }
 109
 110         lnbp21->config |= lnbp21->override_or;
 111         lnbp21->config &= lnbp21->override_and;
 112
 113         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
 114 }
 115
 116 static void lnbp21_release(struct dvb_frontend *fe)
 117 {
 118         /* LNBP power off */
 119         lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF);
 120
 121         /* free data */
 122         kfree(fe->sec_priv);
 123         fe->sec_priv = NULL;
 124 }
 125
 126 static struct dvb_frontend *lnbx2x_attach(struct dvb_frontend *fe,
 127                                 struct i2c_adapter *i2c, u8 override_set,
 128                                 u8 override_clear, u8 i2c_addr, u8 config)
 129 {
 130         struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL);
 131         if (!lnbp21)
 132                 return NULL;
 133
 134         /* default configuration */
 135         lnbp21->config = config;
 136         lnbp21->i2c = i2c;
 137         lnbp21->i2c_addr = i2c_addr;
 138         fe->sec_priv = lnbp21;
 139
 140         /* bits which should be forced to '1' */
 141         lnbp21->override_or = override_set;
 142
 143         /* bits which should be forced to '0' */
 144         lnbp21->override_and = ~override_clear;
 145
 146         /* detect if it is present or not */
 147         if (lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 148                 kfree(lnbp21);
 149                 return NULL;
 150         }
 151
 152         /* install release callback */
 153         fe->ops.release_sec = lnbp21_release;
 154
 155         /* override frontend ops */
 156         fe->ops.set_voltage = lnbp21_set_voltage;
 157         fe->ops.enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage;
 158         if (!(override_clear & LNBH24_TEN)) /*22kHz logic controlled by demod*/
 159                 fe->ops.set_tone = lnbp21_set_tone;
 160         printk(KERN_INFO "LNBx2x attached on addr=%x\n", lnbp21->i2c_addr);
 161
 162         return fe;
 163 }
 164
 165 struct dvb_frontend *lnbh24_attach(struct dvb_frontend *fe,
 166                                 struct i2c_adapter *i2c, u8 override_set,
 167                                 u8 override_clear, u8 i2c_addr)
 168 {
 169         return lnbx2x_attach(fe, i2c, override_set, override_clear,
 170                                                         i2c_addr, LNBH24_TTX);
 171 }
 172 EXPORT_SYMBOL(lnbh24_attach);
 173
 174 struct dvb_frontend *lnbp21_attach(struct dvb_frontend *fe,
 175                                 struct i2c_adapter *i2c, u8 override_set,
 176                                 u8 override_clear)
 177 {
 178         return lnbx2x_attach(fe, i2c, override_set, override_clear,
 179                                                         0x08, LNBP21_ISEL);
 180 }
 181 EXPORT_SYMBOL(lnbp21_attach);
 182
 183 MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp21, lnbh24");
 184 MODULE_AUTHOR("Oliver Endriss, Igor M. Liplianin");
 185 MODULE_LICENSE("GPL");