133 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * lnbp22.h - driver for lnb supply and control ic lnbp224 *5 * Copyright (C) 2006 Dominik Kuhlen6 * Based on lnbp21 driver7 *8 * the project's page is at https://linuxtv.org9 */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 22static int debug;23module_param(debug, int, 0644);24MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");25 26 27#define dprintk(lvl, arg...) if (debug >= (lvl)) printk(arg)28 29struct lnbp22 {30 u8 config[4];31 struct i2c_adapter *i2c;32};33 34static 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 66static 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 else80 lnbp22->config[3] &= ~LNBP22_LLC;81 82 return (i2c_transfer(lnbp22->i2c, &msg, 1) == 1) ? 0 : -EIO;83}84 85static 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 96struct 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}128EXPORT_SYMBOL_GPL(lnbp22_attach);129 130MODULE_DESCRIPTION("Driver for lnb supply and control ic lnbp22");131MODULE_AUTHOR("Dominik Kuhlen");132MODULE_LICENSE("GPL");133