drivers/media/dvb-frontends/isl6405.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * isl6405.c - driver for dual lnb supply and control ic ISL6405
   4  *
   5  * Copyright (C) 2008 Hartmut Hackmann
   6  * Copyright (C) 2006 Oliver Endriss
   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/string.h>
  16 #include <linux/slab.h>
  17
  18 #include <media/dvb_frontend.h>
  19 #include "isl6405.h"
  20
  21 struct isl6405 {
  22         u8                      config;
  23         u8                      override_or;
  24         u8                      override_and;
  25         struct i2c_adapter      *i2c;
  26         u8                      i2c_addr;
  27 };
  28
  29 static int isl6405_set_voltage(struct dvb_frontend *fe,
  30                                enum fe_sec_voltage voltage)
  31 {
  32         struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
  33         struct i2c_msg msg = {  .addr = isl6405->i2c_addr, .flags = 0,
  34                                 .buf = &isl6405->config,
  35                                 .len = sizeof(isl6405->config) };
  36
  37         if (isl6405->override_or & 0x80) {
  38                 isl6405->config &= ~(ISL6405_VSEL2 | ISL6405_EN2);
  39                 switch (voltage) {
  40                 case SEC_VOLTAGE_OFF:
  41                         break;
  42                 case SEC_VOLTAGE_13:
  43                         isl6405->config |= ISL6405_EN2;
  44                         break;
  45                 case SEC_VOLTAGE_18:
  46                         isl6405->config |= (ISL6405_EN2 | ISL6405_VSEL2);
  47                         break;
  48                 default:
  49                         return -EINVAL;
  50                 }
  51         } else {
  52                 isl6405->config &= ~(ISL6405_VSEL1 | ISL6405_EN1);
  53                 switch (voltage) {
  54                 case SEC_VOLTAGE_OFF:
  55                         break;
  56                 case SEC_VOLTAGE_13:
  57                         isl6405->config |= ISL6405_EN1;
  58                         break;
  59                 case SEC_VOLTAGE_18:
  60                         isl6405->config |= (ISL6405_EN1 | ISL6405_VSEL1);
  61                         break;
  62                 default:
  63                         return -EINVAL;
  64                 }
  65         }
  66         isl6405->config |= isl6405->override_or;
  67         isl6405->config &= isl6405->override_and;
  68
  69         return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
  70 }
  71
  72 static int isl6405_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  73 {
  74         struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
  75         struct i2c_msg msg = {  .addr = isl6405->i2c_addr, .flags = 0,
  76                                 .buf = &isl6405->config,
  77                                 .len = sizeof(isl6405->config) };
  78
  79         if (isl6405->override_or & 0x80) {
  80                 if (arg)
  81                         isl6405->config |= ISL6405_LLC2;
  82                 else
  83                         isl6405->config &= ~ISL6405_LLC2;
  84         } else {
  85                 if (arg)
  86                         isl6405->config |= ISL6405_LLC1;
  87                 else
  88                         isl6405->config &= ~ISL6405_LLC1;
  89         }
  90         isl6405->config |= isl6405->override_or;
  91         isl6405->config &= isl6405->override_and;
  92
  93         return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
  94 }
  95
  96 static void isl6405_release(struct dvb_frontend *fe)
  97 {
  98         /* power off */
  99         isl6405_set_voltage(fe, SEC_VOLTAGE_OFF);
 100
 101         /* free */
 102         kfree(fe->sec_priv);
 103         fe->sec_priv = NULL;
 104 }
 105
 106 struct dvb_frontend *isl6405_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c,
 107                                     u8 i2c_addr, u8 override_set, u8 override_clear)
 108 {
 109         struct isl6405 *isl6405 = kmalloc(sizeof(struct isl6405), GFP_KERNEL);
 110         if (!isl6405)
 111                 return NULL;
 112
 113         /* default configuration */
 114         if (override_set & 0x80)
 115                 isl6405->config = ISL6405_ISEL2;
 116         else
 117                 isl6405->config = ISL6405_ISEL1;
 118         isl6405->i2c = i2c;
 119         isl6405->i2c_addr = i2c_addr;
 120         fe->sec_priv = isl6405;
 121
 122         /* bits which should be forced to '1' */
 123         isl6405->override_or = override_set;
 124
 125         /* bits which should be forced to '0' */
 126         isl6405->override_and = ~override_clear;
 127
 128         /* detect if it is present or not */
 129         if (isl6405_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 130                 kfree(isl6405);
 131                 fe->sec_priv = NULL;
 132                 return NULL;
 133         }
 134
 135         /* install release callback */
 136         fe->ops.release_sec = isl6405_release;
 137
 138         /* override frontend ops */
 139         fe->ops.set_voltage = isl6405_set_voltage;
 140         fe->ops.enable_high_lnb_voltage = isl6405_enable_high_lnb_voltage;
 141
 142         return fe;
 143 }
 144 EXPORT_SYMBOL(isl6405_attach);
 145
 146 MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6405");
 147 MODULE_AUTHOR("Hartmut Hackmann & Oliver Endriss");
 148 MODULE_LICENSE("GPL");