drivers/media/dvb-frontends/lnbp22.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * lnbp22.h - driver for lnb supply and control ic lnbp22
   4  *
   5  * Copyright (C) 2006 Dominik Kuhlen
   6  * Based on lnbp21 driver
   7  *
   8  * the project's page is at https://linuxtv.org
   9  */
  10 #include <linux/delay.h>
  11 #include <linux/errno.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/string.h>
  17 #include <linux/slab.h>
  18
  19 #include <media/dvb_frontend.h>
  20 #include "lnbp22.h"
  21
  22 static int debug;
  23 module_param(debug, int, 0644);
  24 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  25
  26
  27 #define dprintk(lvl, arg...) if (debug >= (lvl)) printk(arg)
  28
  29 struct lnbp22 {
  30         u8                  config[4];
  31         struct i2c_adapter *i2c;
  32 };
  33
  34 static int lnbp22_set_voltage(struct dvb_frontend *fe,
  35                               enum fe_sec_voltage voltage)
  36 {
  37         struct lnbp22 *lnbp22 = (struct lnbp22 *)fe->sec_priv;
  38         struct i2c_msg msg = {
  39                 .addr = 0x08,
  40                 .flags = 0,
  41                 .buf = (char *)&lnbp22->config,
  42                 .len = sizeof(lnbp22->config),
  43         };
  44
  45         dprintk(1, "%s: %d (18V=%d 13V=%d)\n", __func__, voltage,
  46                SEC_VOLTAGE_18, SEC_VOLTAGE_13);
  47
  48         lnbp22->config[3] = 0x60; /* Power down */
  49         switch (voltage) {
  50         case SEC_VOLTAGE_OFF:
  51                 break;
  52         case SEC_VOLTAGE_13:
  53                 lnbp22->config[3] |= LNBP22_EN;
  54                 break;
  55         case SEC_VOLTAGE_18:
  56                 lnbp22->config[3] |= (LNBP22_EN | LNBP22_VSEL);
  57                 break;
  58         default:
  59                 return -EINVAL;
  60         }
  61
  62         dprintk(1, "%s: 0x%02x)\n", __func__, lnbp22->config[3]);
  63         return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO;
  64 }
  65
  66 static int lnbp22_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  67 {
  68         struct lnbp22 *lnbp22 = (struct lnbp22 *) fe->sec_priv;
  69         struct i2c_msg msg = {
  70                 .addr = 0x08,
  71                 .flags = 0,
  72                 .buf = (char *)&lnbp22->config,
  73                 .len = sizeof(lnbp22->config),
  74         };
  75
  76         dprintk(1, "%s: %d\n", __func__, (int)arg);
  77         if (arg)
  78                 lnbp22->config[3] |= LNBP22_LLC;
  79         else
  80                 lnbp22->config[3] &= ~LNBP22_LLC;
  81
  82         return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO;
  83 }
  84
  85 static void lnbp22_release(struct dvb_frontend *fe)
  86 {
  87         dprintk(1, "%s\n", __func__);
  88         /* LNBP power off */
  89         lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF);
  90
  91         /* free data */
  92         kfree(fe->sec_priv);
  93         fe->sec_priv = NULL;
  94 }
  95
  96 struct dvb_frontend *lnbp22_attach(struct dvb_frontend *fe,
  97                                         struct i2c_adapter *i2c)
  98 {
  99         struct lnbp22 *lnbp22 = kmalloc(sizeof(struct lnbp22), GFP_KERNEL);
 100         if (!lnbp22)
 101                 return NULL;
 102
 103         /* default configuration */
 104         lnbp22->config[0] = 0x00; /* ? */
 105         lnbp22->config[1] = 0x28; /* ? */
 106         lnbp22->config[2] = 0x48; /* ? */
 107         lnbp22->config[3] = 0x60; /* Power down */
 108         lnbp22->i2c = i2c;
 109         fe->sec_priv = lnbp22;
 110
 111         /* detect if it is present or not */
 112         if (lnbp22_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 113                 dprintk(0, "%s LNBP22 not found\n", __func__);
 114                 kfree(lnbp22);
 115                 fe->sec_priv = NULL;
 116                 return NULL;
 117         }
 118
 119         /* install release callback */
 120         fe->ops.release_sec = lnbp22_release;
 121
 122         /* override frontend ops */
 123         fe->ops.set_voltage = lnbp22_set_voltage;
 124         fe->ops.enable_high_lnb_voltage = lnbp22_enable_high_lnb_voltage;
 125
 126         return fe;
 127 }
 128 EXPORT_SYMBOL(lnbp22_attach);
 129
 130 MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp22");
 131 MODULE_AUTHOR("Dominik Kuhlen");
 132 MODULE_LICENSE("GPL");