| 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"); |