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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 | // SPDX-License-Identifier: GPL-2.0-or-later /* * isl6421.h - driver for lnb supply and control ic ISL6421 * * Copyright (C) 2006 Andrew de Quincey * Copyright (C) 2006 Oliver Endriss * * the project's page is at https://linuxtv.org */ #include <linux/delay.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/string.h> #include <linux/slab.h> #include <media/dvb_frontend.h> #include "isl6421.h" struct isl6421 { u8 config; u8 override_or; u8 override_and; struct i2c_adapter *i2c; u8 i2c_addr; bool is_off; }; static int isl6421_set_voltage(struct dvb_frontend *fe, enum fe_sec_voltage voltage) { int ret; u8 buf; bool is_off; struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv; struct i2c_msg msg[2] = { { .addr = isl6421->i2c_addr, .flags = 0, .buf = &isl6421->config, .len = 1, }, { .addr = isl6421->i2c_addr, .flags = I2C_M_RD, .buf = &buf, .len = 1, } }; isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1); switch(voltage) { case SEC_VOLTAGE_OFF: is_off = true; break; case SEC_VOLTAGE_13: is_off = false; isl6421->config |= ISL6421_EN1; break; case SEC_VOLTAGE_18: is_off = false; isl6421->config |= (ISL6421_EN1 | ISL6421_VSEL1); break; default: return -EINVAL; } /* * If LNBf were not powered on, disable dynamic current limit, as, * according with datasheet, highly capacitive load on the output may * cause a difficult start-up. */ if (isl6421->is_off && !is_off) isl6421->config |= ISL6421_DCL; isl6421->config |= isl6421->override_or; isl6421->config &= isl6421->override_and; ret = i2c_transfer(isl6421->i2c, msg, 2); if (ret < 0) return ret; if (ret != 2) return -EIO; /* Store off status now in case future commands fail */ isl6421->is_off = is_off; /* On overflow, the device will try again after 900 ms (typically) */ if (!is_off && (buf & ISL6421_OLF1)) msleep(1000); /* Re-enable dynamic current limit */ if ((isl6421->config & ISL6421_DCL) && !(isl6421->override_or & ISL6421_DCL)) { isl6421->config &= ~ISL6421_DCL; ret = i2c_transfer(isl6421->i2c, msg, 2); if (ret < 0) return ret; if (ret != 2) return -EIO; } /* Check if overload flag is active. If so, disable power */ if (!is_off && (buf & ISL6421_OLF1)) { isl6421->config &= ~(ISL6421_VSEL1 | ISL6421_EN1); ret = i2c_transfer(isl6421->i2c, msg, 1); if (ret < 0) return ret; if (ret != 1) return -EIO; isl6421->is_off = true; dev_warn(&isl6421->i2c->dev, "Overload current detected. disabling LNBf power\n"); return -EINVAL; } return 0; } static int isl6421_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg) { struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv; struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0, .buf = &isl6421->config, .len = sizeof(isl6421->config) }; if (arg) isl6421->config |= ISL6421_LLC1; else isl6421->config &= ~ISL6421_LLC1; isl6421->config |= isl6421->override_or; isl6421->config &= isl6421->override_and; return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO; } static int isl6421_set_tone(struct dvb_frontend *fe, enum fe_sec_tone_mode tone) { struct isl6421 *isl6421 = (struct isl6421 *) fe->sec_priv; struct i2c_msg msg = { .addr = isl6421->i2c_addr, .flags = 0, .buf = &isl6421->config, .len = sizeof(isl6421->config) }; switch (tone) { case SEC_TONE_ON: isl6421->config |= ISL6421_ENT1; break; case SEC_TONE_OFF: isl6421->config &= ~ISL6421_ENT1; break; default: return -EINVAL; } isl6421->config |= isl6421->override_or; isl6421->config &= isl6421->override_and; return (i2c_transfer(isl6421->i2c, &msg, 1) == 1) ? 0 : -EIO; } static void isl6421_release(struct dvb_frontend *fe) { /* power off */ isl6421_set_voltage(fe, SEC_VOLTAGE_OFF); /* free */ kfree(fe->sec_priv); fe->sec_priv = NULL; } struct dvb_frontend *isl6421_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, u8 i2c_addr, u8 override_set, u8 override_clear, bool override_tone) { struct isl6421 *isl6421 = kmalloc(sizeof(struct isl6421), GFP_KERNEL); if (!isl6421) return NULL; /* default configuration */ isl6421->config = ISL6421_ISEL1; isl6421->i2c = i2c; isl6421->i2c_addr = i2c_addr; fe->sec_priv = isl6421; /* bits which should be forced to '1' */ isl6421->override_or = override_set; /* bits which should be forced to '0' */ isl6421->override_and = ~override_clear; /* detect if it is present or not */ if (isl6421_set_voltage(fe, SEC_VOLTAGE_OFF)) { kfree(isl6421); fe->sec_priv = NULL; return NULL; } isl6421->is_off = true; /* install release callback */ fe->ops.release_sec = isl6421_release; /* override frontend ops */ fe->ops.set_voltage = isl6421_set_voltage; fe->ops.enable_high_lnb_voltage = isl6421_enable_high_lnb_voltage; if (override_tone) fe->ops.set_tone = isl6421_set_tone; return fe; } EXPORT_SYMBOL_GPL(isl6421_attach); MODULE_DESCRIPTION("Driver for lnb supply and control ic isl6421"); MODULE_AUTHOR("Andrew de Quincey & Oliver Endriss"); MODULE_LICENSE("GPL"); |