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