Thomas Gleixner | c942fdd | 2019-05-27 08:55:06 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Kozlov Sergey | e025273 | 2015-07-28 11:33:02 -0300 | [diff] [blame] | 2 | /* |
| 3 | * lnbh25.c |
| 4 | * |
| 5 | * Driver for LNB supply and control IC LNBH25 |
| 6 | * |
| 7 | * Copyright (C) 2014 NetUP Inc. |
| 8 | * Copyright (C) 2014 Sergey Kozlov <serjk@netup.ru> |
| 9 | * Copyright (C) 2014 Abylay Ospan <aospan@netup.ru> |
Kozlov Sergey | e025273 | 2015-07-28 11:33:02 -0300 | [diff] [blame] | 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/string.h> |
| 15 | #include <linux/slab.h> |
| 16 | |
Mauro Carvalho Chehab | fada193 | 2017-12-28 13:03:51 -0500 | [diff] [blame] | 17 | #include <media/dvb_frontend.h> |
Kozlov Sergey | e025273 | 2015-07-28 11:33:02 -0300 | [diff] [blame] | 18 | #include "lnbh25.h" |
| 19 | |
| 20 | /** |
| 21 | * struct lnbh25_priv - LNBH25 driver private data |
| 22 | * @i2c: pointer to the I2C adapter structure |
| 23 | * @i2c_address: I2C address of LNBH25 SEC chip |
| 24 | * @config: Registers configuration: |
| 25 | * offset 0: 1st register address, always 0x02 (DATA1) |
| 26 | * offset 1: DATA1 register value |
| 27 | * offset 2: DATA2 register value |
| 28 | */ |
| 29 | struct lnbh25_priv { |
| 30 | struct i2c_adapter *i2c; |
| 31 | u8 i2c_address; |
| 32 | u8 config[3]; |
| 33 | }; |
| 34 | |
| 35 | #define LNBH25_STATUS_OFL 0x1 |
| 36 | #define LNBH25_STATUS_VMON 0x4 |
| 37 | #define LNBH25_VSEL_13 0x03 |
| 38 | #define LNBH25_VSEL_18 0x0a |
| 39 | |
| 40 | static int lnbh25_read_vmon(struct lnbh25_priv *priv) |
| 41 | { |
| 42 | int i, ret; |
| 43 | u8 addr = 0x00; |
| 44 | u8 status[6]; |
| 45 | struct i2c_msg msg[2] = { |
| 46 | { |
| 47 | .addr = priv->i2c_address, |
| 48 | .flags = 0, |
| 49 | .len = 1, |
| 50 | .buf = &addr |
| 51 | }, { |
| 52 | .addr = priv->i2c_address, |
| 53 | .flags = I2C_M_RD, |
| 54 | .len = sizeof(status), |
| 55 | .buf = status |
| 56 | } |
| 57 | }; |
| 58 | |
| 59 | for (i = 0; i < 2; i++) { |
| 60 | ret = i2c_transfer(priv->i2c, &msg[i], 1); |
| 61 | if (ret >= 0 && ret != 1) |
| 62 | ret = -EIO; |
| 63 | if (ret < 0) { |
| 64 | dev_dbg(&priv->i2c->dev, |
| 65 | "%s(): I2C transfer %d failed (%d)\n", |
| 66 | __func__, i, ret); |
| 67 | return ret; |
| 68 | } |
| 69 | } |
Daniel Scheller | e1bdf02 | 2017-06-20 16:57:24 -0300 | [diff] [blame] | 70 | dev_dbg(&priv->i2c->dev, "%s(): %*ph\n", |
| 71 | __func__, (int) sizeof(status), status); |
Kozlov Sergey | e025273 | 2015-07-28 11:33:02 -0300 | [diff] [blame] | 72 | if ((status[0] & (LNBH25_STATUS_OFL | LNBH25_STATUS_VMON)) != 0) { |
| 73 | dev_err(&priv->i2c->dev, |
| 74 | "%s(): voltage in failure state, status reg 0x%x\n", |
| 75 | __func__, status[0]); |
| 76 | return -EIO; |
| 77 | } |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | static int lnbh25_set_voltage(struct dvb_frontend *fe, |
| 82 | enum fe_sec_voltage voltage) |
| 83 | { |
| 84 | int ret; |
| 85 | u8 data1_reg; |
| 86 | const char *vsel; |
| 87 | struct lnbh25_priv *priv = fe->sec_priv; |
| 88 | struct i2c_msg msg = { |
| 89 | .addr = priv->i2c_address, |
| 90 | .flags = 0, |
| 91 | .len = sizeof(priv->config), |
| 92 | .buf = priv->config |
| 93 | }; |
| 94 | |
| 95 | switch (voltage) { |
| 96 | case SEC_VOLTAGE_OFF: |
| 97 | data1_reg = 0x00; |
| 98 | vsel = "Off"; |
| 99 | break; |
| 100 | case SEC_VOLTAGE_13: |
| 101 | data1_reg = LNBH25_VSEL_13; |
| 102 | vsel = "13V"; |
| 103 | break; |
| 104 | case SEC_VOLTAGE_18: |
| 105 | data1_reg = LNBH25_VSEL_18; |
| 106 | vsel = "18V"; |
| 107 | break; |
| 108 | default: |
| 109 | return -EINVAL; |
| 110 | } |
| 111 | priv->config[1] = data1_reg; |
| 112 | dev_dbg(&priv->i2c->dev, |
| 113 | "%s(): %s, I2C 0x%x write [ %02x %02x %02x ]\n", |
| 114 | __func__, vsel, priv->i2c_address, |
| 115 | priv->config[0], priv->config[1], priv->config[2]); |
| 116 | ret = i2c_transfer(priv->i2c, &msg, 1); |
| 117 | if (ret >= 0 && ret != 1) |
| 118 | ret = -EIO; |
| 119 | if (ret < 0) { |
| 120 | dev_err(&priv->i2c->dev, "%s(): I2C transfer error (%d)\n", |
| 121 | __func__, ret); |
| 122 | return ret; |
| 123 | } |
| 124 | if (voltage != SEC_VOLTAGE_OFF) { |
| 125 | msleep(120); |
| 126 | ret = lnbh25_read_vmon(priv); |
| 127 | } else { |
| 128 | msleep(20); |
| 129 | ret = 0; |
| 130 | } |
| 131 | return ret; |
| 132 | } |
| 133 | |
| 134 | static void lnbh25_release(struct dvb_frontend *fe) |
| 135 | { |
| 136 | struct lnbh25_priv *priv = fe->sec_priv; |
| 137 | |
| 138 | dev_dbg(&priv->i2c->dev, "%s()\n", __func__); |
| 139 | lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF); |
| 140 | kfree(fe->sec_priv); |
| 141 | fe->sec_priv = NULL; |
| 142 | } |
| 143 | |
| 144 | struct dvb_frontend *lnbh25_attach(struct dvb_frontend *fe, |
| 145 | struct lnbh25_config *cfg, |
| 146 | struct i2c_adapter *i2c) |
| 147 | { |
| 148 | struct lnbh25_priv *priv; |
| 149 | |
| 150 | dev_dbg(&i2c->dev, "%s()\n", __func__); |
| 151 | priv = kzalloc(sizeof(struct lnbh25_priv), GFP_KERNEL); |
| 152 | if (!priv) |
| 153 | return NULL; |
| 154 | priv->i2c_address = (cfg->i2c_address >> 1); |
| 155 | priv->i2c = i2c; |
| 156 | priv->config[0] = 0x02; |
| 157 | priv->config[1] = 0x00; |
| 158 | priv->config[2] = cfg->data2_config; |
| 159 | fe->sec_priv = priv; |
| 160 | if (lnbh25_set_voltage(fe, SEC_VOLTAGE_OFF)) { |
| 161 | dev_err(&i2c->dev, |
| 162 | "%s(): no LNBH25 found at I2C addr 0x%02x\n", |
| 163 | __func__, priv->i2c_address); |
| 164 | kfree(priv); |
| 165 | fe->sec_priv = NULL; |
| 166 | return NULL; |
| 167 | } |
| 168 | |
| 169 | fe->ops.release_sec = lnbh25_release; |
| 170 | fe->ops.set_voltage = lnbh25_set_voltage; |
| 171 | |
Daniel Scheller | e1bdf02 | 2017-06-20 16:57:24 -0300 | [diff] [blame] | 172 | dev_info(&i2c->dev, "%s(): attached at I2C addr 0x%02x\n", |
Kozlov Sergey | e025273 | 2015-07-28 11:33:02 -0300 | [diff] [blame] | 173 | __func__, priv->i2c_address); |
| 174 | return fe; |
| 175 | } |
Greg Kroah-Hartman | 86495af | 2023-09-08 10:20:36 +0100 | [diff] [blame] | 176 | EXPORT_SYMBOL_GPL(lnbh25_attach); |
Kozlov Sergey | e025273 | 2015-07-28 11:33:02 -0300 | [diff] [blame] | 177 | |
| 178 | MODULE_DESCRIPTION("ST LNBH25 driver"); |
| 179 | MODULE_AUTHOR("info@netup.ru"); |
| 180 | MODULE_LICENSE("GPL"); |