drivers/media/dvb-frontends/lnbp21.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * lnbp21.c - driver for lnb supply and control ic lnbp21
   4  *
   5  * Copyright (C) 2006, 2009 Oliver Endriss <o.endriss@gmx.de>
   6  * Copyright (C) 2009 Igor M. Liplianin <liplianin@netup.ru>
   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 "lnbp21.h"
  20 #include "lnbh24.h"
  21
  22 struct lnbp21 {
  23         u8                      config;
  24         u8                      override_or;
  25         u8                      override_and;
  26         struct i2c_adapter      *i2c;
  27         u8                      i2c_addr;
  28 };
  29
  30 static int lnbp21_set_voltage(struct dvb_frontend *fe,
  31                               enum fe_sec_voltage voltage)
  32 {
  33         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
  34         struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
  35                                 .buf = &lnbp21->config,
  36                                 .len = sizeof(lnbp21->config) };
  37
  38         lnbp21->config &= ~(LNBP21_VSEL | LNBP21_EN);
  39
  40         switch(voltage) {
  41         case SEC_VOLTAGE_OFF:
  42                 break;
  43         case SEC_VOLTAGE_13:
  44                 lnbp21->config |= LNBP21_EN;
  45                 break;
  46         case SEC_VOLTAGE_18:
  47                 lnbp21->config |= (LNBP21_EN | LNBP21_VSEL);
  48                 break;
  49         default:
  50                 return -EINVAL;
  51         }
  52
  53         lnbp21->config |= lnbp21->override_or;
  54         lnbp21->config &= lnbp21->override_and;
  55
  56         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
  57 }
  58
  59 static int lnbp21_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
  60 {
  61         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
  62         struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
  63                                 .buf = &lnbp21->config,
  64                                 .len = sizeof(lnbp21->config) };
  65
  66         if (arg)
  67                 lnbp21->config |= LNBP21_LLC;
  68         else
  69                 lnbp21->config &= ~LNBP21_LLC;
  70
  71         lnbp21->config |= lnbp21->override_or;
  72         lnbp21->config &= lnbp21->override_and;
  73
  74         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
  75 }
  76
  77 static int lnbp21_set_tone(struct dvb_frontend *fe,
  78                            enum fe_sec_tone_mode tone)
  79 {
  80         struct lnbp21 *lnbp21 = (struct lnbp21 *) fe->sec_priv;
  81         struct i2c_msg msg = {  .addr = lnbp21->i2c_addr, .flags = 0,
  82                                 .buf = &lnbp21->config,
  83                                 .len = sizeof(lnbp21->config) };
  84
  85         switch (tone) {
  86         case SEC_TONE_OFF:
  87                 lnbp21->config &= ~LNBP21_TEN;
  88                 break;
  89         case SEC_TONE_ON:
  90                 lnbp21->config |= LNBP21_TEN;
  91                 break;
  92         default:
  93                 return -EINVAL;
  94         }
  95
  96         lnbp21->config |= lnbp21->override_or;
  97         lnbp21->config &= lnbp21->override_and;
  98
  99         return (i2c_transfer(lnbp21->i2c, &msg, 1) == 1) ? 0 : -EIO;
 100 }
 101
 102 static void lnbp21_release(struct dvb_frontend *fe)
 103 {
 104         /* LNBP power off */
 105         lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF);
 106
 107         /* free data */
 108         kfree(fe->sec_priv);
 109         fe->sec_priv = NULL;
 110 }
 111
 112 static struct dvb_frontend *lnbx2x_attach(struct dvb_frontend *fe,
 113                                 struct i2c_adapter *i2c, u8 override_set,
 114                                 u8 override_clear, u8 i2c_addr, u8 config)
 115 {
 116         struct lnbp21 *lnbp21 = kmalloc(sizeof(struct lnbp21), GFP_KERNEL);
 117         if (!lnbp21)
 118                 return NULL;
 119
 120         /* default configuration */
 121         lnbp21->config = config;
 122         lnbp21->i2c = i2c;
 123         lnbp21->i2c_addr = i2c_addr;
 124         fe->sec_priv = lnbp21;
 125
 126         /* bits which should be forced to '1' */
 127         lnbp21->override_or = override_set;
 128
 129         /* bits which should be forced to '0' */
 130         lnbp21->override_and = ~override_clear;
 131
 132         /* detect if it is present or not */
 133         if (lnbp21_set_voltage(fe, SEC_VOLTAGE_OFF)) {
 134                 kfree(lnbp21);
 135                 return NULL;
 136         }
 137
 138         /* install release callback */
 139         fe->ops.release_sec = lnbp21_release;
 140
 141         /* override frontend ops */
 142         fe->ops.set_voltage = lnbp21_set_voltage;
 143         fe->ops.enable_high_lnb_voltage = lnbp21_enable_high_lnb_voltage;
 144         if (!(override_clear & LNBH24_TEN)) /*22kHz logic controlled by demod*/
 145                 fe->ops.set_tone = lnbp21_set_tone;
 146         printk(KERN_INFO "LNBx2x attached on addr=%x\n", lnbp21->i2c_addr);
 147
 148         return fe;
 149 }
 150
 151 struct dvb_frontend *lnbh24_attach(struct dvb_frontend *fe,
 152                                 struct i2c_adapter *i2c, u8 override_set,
 153                                 u8 override_clear, u8 i2c_addr)
 154 {
 155         return lnbx2x_attach(fe, i2c, override_set, override_clear,
 156                                                         i2c_addr, LNBH24_TTX);
 157 }
 158 EXPORT_SYMBOL(lnbh24_attach);
 159
 160 struct dvb_frontend *lnbp21_attach(struct dvb_frontend *fe,
 161                                 struct i2c_adapter *i2c, u8 override_set,
 162                                 u8 override_clear)
 163 {
 164         return lnbx2x_attach(fe, i2c, override_set, override_clear,
 165                                                         0x08, LNBP21_ISEL);
 166 }
 167 EXPORT_SYMBOL(lnbp21_attach);
 168
 169 MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp21, lnbh24");
 170 MODULE_AUTHOR("Oliver Endriss, Igor M. Liplianin");
 171 MODULE_LICENSE("GPL");