drivers/media/dvb-frontends/lnbp22.c

   1 /*
   2  * lnbp22.h - driver for lnb supply and control ic lnbp22
   3  *
   4  * Copyright (C) 2006 Dominik Kuhlen
   5  * Based on lnbp21 driver
   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/moduleparam.h>
  30 #include <linux/string.h>
  31 #include <linux/slab.h>
  32
  33 #include <media/dvb_frontend.h>
  34 #include "lnbp22.h"
  35
  36 static int debug;
  37 module_param(debug, int, 0644);
  38 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  39
  40
  41 #define dprintk(lvl, arg...) if (debug >= (lvl)) printk(arg)
  42
  43 struct lnbp22 {
  44         u8                  config[4];
  45         struct i2c_adapter *i2c;
  46 };
  47
  48 static int lnbp22_set_voltage(struct dvb_frontend *fe,
  49                               enum fe_sec_voltage voltage)
  50 {
  51         struct lnbp22 *lnbp22 = (struct lnbp22 *)fe->sec_priv;
  52         struct i2c_msg msg = {
  53                 .addr = 0x08,
  54                 .flags = 0,
  55                 .buf = (char *)&lnbp22->config,
  56                 .len = sizeof(lnbp22->config),
  57         };
  58
  59         dprintk(1, "%s: %d (18V=%d 13V=%d)\n", __func__, voltage,
  60                SEC_VOLTAGE_18, SEC_VOLTAGE_13);
  61
  62         lnbp22->config[3] = 0x60; /* Power down */
  63         switch (voltage) {
  64         case SEC_VOLTAGE_OFF:
  65                 break;
  66         case SEC_VOLTAGE_13:
  67                 lnbp22->config[3] |= LNBP22_EN;
  68                 break;
  69         case SEC_VOLTAGE_18:
  70                 lnbp22->config[3] |= (LNBP22_EN | LNBP22_VSEL);
  71                 break;
  72         default:
  73                 return -EINVAL;
  74         }
  75
  76         dprintk(1, "%s: 0x%02x)\n", __func__, lnbp22->config[3]);
  77         return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO;
  78 }
  79
  80 static int lnbp22_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  81 {
  82         struct lnbp22 *lnbp22 = (struct lnbp22 *) fe->sec_priv;
  83         struct i2c_msg msg = {
  84                 .addr = 0x08,
  85                 .flags = 0,
  86                 .buf = (char *)&lnbp22->config,
  87                 .len = sizeof(lnbp22->config),
  88         };
  89
  90         dprintk(1, "%s: %d\n", __func__, (int)arg);
  91         if (arg)
  92                 lnbp22->config[3] |= LNBP22_LLC;
  93         else
  94                 lnbp22->config[3] &= ~LNBP22_LLC;
  95
  96         return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO;
  97 }
  98
  99 static void lnbp22_release(struct dvb_frontend *fe)
 100 {
 101         dprintk(1, "%s\n", __func__);
 102         /* LNBP power off */
 103         lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF);
 104
 105         /* free data */
 106         kfree(fe->sec_priv);
 107         fe->sec_priv = NULL;
 108 }
 109
 110 struct dvb_frontend *lnbp22_attach(struct dvb_frontend *fe,
 111                                         struct i2c_adapter *i2c)
 112 {
 113         struct lnbp22 *lnbp22 = kmalloc(sizeof(struct lnbp22), GFP_KERNEL);
 114         if (!lnbp22)
 115                 return NULL;
 116
 117         /* default configuration */
 118         lnbp22->config[0] = 0x00; /* ? */
 119         lnbp22->config[1] = 0x28; /* ? */
 120         lnbp22->config[2] = 0x48; /* ? */
 121         lnbp22->config[3] = 0x60; /* Power down */
 122         lnbp22->i2c = i2c;
 123         fe->sec_priv = lnbp22;
 124
 125         /* detect if it is present or not */
 126         if (lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 127                 dprintk(0, "%s LNBP22 not found\n", __func__);
 128                 kfree(lnbp22);
 129                 fe->sec_priv = NULL;
 130                 return NULL;
 131         }
 132
 133         /* install release callback */
 134         fe->ops.release_sec = lnbp22_release;
 135
 136         /* override frontend ops */
 137         fe->ops.set_voltage = lnbp22_set_voltage;
 138         fe->ops.enable_high_lnb_voltage = lnbp22_enable_high_lnb_voltage;
 139
 140         return fe;
 141 }
 142 EXPORT_SYMBOL(lnbp22_attach);
 143
 144 MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp22");
 145 MODULE_AUTHOR("Dominik Kuhlen");
 146 MODULE_LICENSE("GPL");