1 | //driver_i2cdmx.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2011-2014 |
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5 | * |
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6 | * This file is part of roard a part of RoarAudio, |
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7 | * a cross-platform sound system for both, home and professional use. |
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8 | * See README for details. |
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9 | * |
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10 | * This file is free software; you can redistribute it and/or modify |
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11 | * it under the terms of the GNU General Public License version 3 |
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12 | * as published by the Free Software Foundation. |
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13 | * |
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14 | * RoarAudio is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | * GNU General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with this software; see the file COPYING. If not, write to |
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21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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22 | * Boston, MA 02110-1301, USA. |
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23 | * |
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24 | */ |
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25 | |
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26 | #include "roard.h" |
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27 | |
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28 | #ifdef ROAR_HAVE_DRIVER_I2CDMX |
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29 | |
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30 | #include <linux/i2c.h> |
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31 | #include <linux/i2c-dev.h> |
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32 | |
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33 | // hard disable SPI mode. |
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34 | #ifdef ROAR_HAVE_H_LINUX_SPI_SPIDEV |
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35 | #undef ROAR_HAVE_H_LINUX_SPI_SPIDEV |
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36 | #endif |
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37 | |
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38 | #ifdef ROAR_HAVE_H_LINUX_SPI_SPIDEV |
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39 | #include <linux/spi/spidev.h> |
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40 | #include <sys/ioctl.h> |
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41 | |
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42 | #define TRANSFER_DELAY 50 |
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43 | #define TRANSFER_SPEED 100000 |
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44 | #define TRANSFER_BPW 8 |
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45 | #define TRANSFER_CHANS 24 |
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46 | #define TRANSFER_SIZE (TRANSFER_CHANS+6) |
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47 | #define SPI_DEVICE "file://dev/spidev0.0" |
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48 | #endif |
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49 | |
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50 | #define DEFAULT_DEVICE "/dev/i2c-1" |
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51 | |
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52 | #define DEV_TYPE 0x01 /* RI2C_DEV_BRIDGE */ |
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53 | #define DEV_SUBTYPE 0x01 /* RI2C_SUBTYPE_BRIDGE_CONVERTER */ |
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54 | #define DEVSTATUS_READY 0x01 /* RI2C_STATUS0_DEVICE_READY */ |
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55 | #define CAPS0_DMX512 0x10 /* RI2C_CAPS0_BRIDGE_DMX512 */ |
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56 | |
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57 | #define MIN_ADDR 0x20 |
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58 | #define MAX_ADDR 0x70 |
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59 | #define MAX_BUSSES 8 |
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60 | |
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61 | #define ADDR_IFVERSION 0 |
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62 | #define ADDR_DEVSTATUS 1 |
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63 | #define ADDR_COMMAND 2 |
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64 | #define ADDR_DEVERROR 3 |
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65 | #define ADDR_BANK 4 |
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66 | #define ADDR_DATA 5 |
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67 | #define ADDR_VENDOR (ADDR_BANK+2) |
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68 | #define ADDR_TYPE (ADDR_BANK+3) |
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69 | #define ADDR_SUBTYPE (ADDR_BANK+4) |
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70 | #define ADDR_PVENDOR (ADDR_BANK+10) |
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71 | #define ADDR_PTYPE (ADDR_BANK+11) |
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72 | #define ADDR_PSUBTYPE (ADDR_BANK+12) |
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73 | #define ADDR_CAPS0 (ADDR_BANK+13) |
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74 | |
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75 | #define COMMAND_DEVINFO 0x00 |
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76 | #define COMMAND_DMX 0x3f |
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77 | |
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78 | struct driver_i2cdmx { |
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79 | struct roar_vio_calls vio; |
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80 | struct roar_vio_calls spi; |
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81 | int have_spi; |
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82 | uint8_t slave; |
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83 | size_t startaddr; |
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84 | size_t len; |
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85 | #ifdef ROAR_HAVE_H_LINUX_SPI_SPIDEV |
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86 | char txtransfer[TRANSFER_SIZE]; |
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87 | char rxtransfer[TRANSFER_SIZE]; |
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88 | #endif |
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89 | }; |
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90 | |
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91 | #ifdef ROAR_HAVE_H_LINUX_SPI_SPIDEV |
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92 | static int __spi_transfer(struct driver_i2cdmx * self, size_t offset_in, size_t offset_out, size_t len) { |
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93 | struct spi_ioc_transfer transfer_buffer = { |
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94 | .tx_buf = (unsigned long) self->txtransfer, |
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95 | .rx_buf = (unsigned long) self->rxtransfer, |
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96 | .len = len, |
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97 | .delay_usecs = TRANSFER_DELAY, |
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98 | .speed_hz = TRANSFER_SPEED, |
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99 | .bits_per_word = TRANSFER_BPW, |
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100 | }; |
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101 | struct roar_vio_sysio_ioctl ctl = {.cmd = SPI_IOC_MESSAGE(1), .argp = &transfer_buffer}; |
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102 | |
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103 | self->txtransfer[0] = 1; // command |
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104 | self->txtransfer[1] = len; |
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105 | self->txtransfer[2] = (offset_in & 0xFF00) >> 8; |
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106 | self->txtransfer[3] = offset_in & 0x00FF; |
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107 | self->txtransfer[4] = (offset_in & 0xFF00) >> 8; |
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108 | self->txtransfer[5] = offset_in & 0x00FF; |
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109 | |
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110 | if ( roar_vio_ctl(&(self->spi), ROAR_VIO_CTL_SYSIO_IOCTL, &ctl) == -1 ) |
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111 | return -1; |
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112 | |
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113 | return 0; |
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114 | } |
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115 | #endif |
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116 | |
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117 | static inline int __i2c_set_slave(struct driver_i2cdmx * self) { |
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118 | struct roar_vio_sysio_ioctl ctl = {.cmd = I2C_SLAVE, .argp = (void*)(int)self->slave}; |
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119 | |
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120 | return roar_vio_ctl(&(self->vio), ROAR_VIO_CTL_SYSIO_IOCTL, &ctl); |
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121 | } |
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122 | |
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123 | static inline int16_t __i2c_read(struct driver_i2cdmx * self, size_t off) { |
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124 | union i2c_smbus_data data = {.byte = 0}; |
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125 | struct i2c_smbus_ioctl_data args = {.read_write = I2C_SMBUS_READ, .command = off, .size = I2C_SMBUS_BYTE_DATA, .data = &data}; |
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126 | struct roar_vio_sysio_ioctl ctl = {.cmd = I2C_SMBUS, .argp = &args}; |
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127 | int ret = roar_vio_ctl(&(self->vio), ROAR_VIO_CTL_SYSIO_IOCTL, &ctl); |
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128 | |
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129 | if ( ret == -1 ) |
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130 | return (int16_t)-1; |
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131 | |
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132 | return (int16_t)(uint16_t)(uint8_t)data.byte; |
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133 | } |
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134 | |
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135 | static inline int __i2c_write(struct driver_i2cdmx * self, size_t off, const uint8_t value) { |
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136 | union i2c_smbus_data data = {.byte = value}; |
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137 | struct i2c_smbus_ioctl_data args = {.read_write = I2C_SMBUS_WRITE, .command = off, .size = I2C_SMBUS_BYTE_DATA, .data = &data}; |
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138 | struct roar_vio_sysio_ioctl ctl = {.cmd = I2C_SMBUS, .argp = &args}; |
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139 | |
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140 | return roar_vio_ctl(&(self->vio), ROAR_VIO_CTL_SYSIO_IOCTL, &ctl); |
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141 | } |
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142 | |
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143 | static inline int __i2c_write_block(struct driver_i2cdmx * self, size_t off, const uint8_t * value) { |
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144 | union i2c_smbus_data data; |
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145 | struct i2c_smbus_ioctl_data args = {.read_write = I2C_SMBUS_WRITE, .command = off, .size = I2C_SMBUS_I2C_BLOCK_BROKEN, .data = &data}; |
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146 | struct roar_vio_sysio_ioctl ctl = {.cmd = I2C_SMBUS, .argp = &args}; |
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147 | size_t i; |
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148 | |
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149 | for (i = 0; i < sizeof(data.block); i++) |
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150 | data.block[i] = 0xAF; |
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151 | |
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152 | data.block[0] = I2C_SMBUS_BLOCK_MAX; |
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153 | |
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154 | for (i = 0; i < I2C_SMBUS_BLOCK_MAX; i++) |
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155 | data.block[i+1] = value[i]; |
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156 | |
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157 | return roar_vio_ctl(&(self->vio), ROAR_VIO_CTL_SYSIO_IOCTL, &ctl); |
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158 | } |
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159 | |
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160 | static inline int __i2c_command(struct driver_i2cdmx * self, uint8_t command) { |
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161 | int16_t ret; |
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162 | |
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163 | if ( __i2c_write(self, ADDR_COMMAND, command) == -1 ) |
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164 | return -1; |
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165 | |
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166 | ret = __i2c_read(self, ADDR_DEVERROR); |
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167 | if ( ret == (int16_t)-1 ) |
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168 | return -1; |
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169 | |
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170 | if ( ret == ROAR_ERROR_NONE ) |
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171 | return 0; |
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172 | |
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173 | roar_err_set(ret); |
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174 | return -1; |
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175 | } |
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176 | |
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177 | static inline int __i2c_start_dmx(struct driver_i2cdmx * self) { |
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178 | return __i2c_command(self, COMMAND_DMX); |
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179 | } |
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180 | |
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181 | static int __open_test_device_type(int16_t vendor, int16_t type, int16_t subtype) { |
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182 | if ( vendor == -1 || type == -1 || subtype == -1 ) |
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183 | return -1; |
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184 | |
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185 | if ( vendor != ROAR_VID_ROARAUDIO || type != DEV_TYPE || subtype != DEV_SUBTYPE ) { |
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186 | roar_err_set(ROAR_ERROR_TYPEMM); |
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187 | return -1; |
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188 | } |
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189 | |
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190 | return 0; |
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191 | } |
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192 | |
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193 | static int __open_test_device(struct driver_i2cdmx * self) { |
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194 | int16_t ret; |
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195 | int16_t vendor, type, subtype; |
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196 | |
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197 | #define __check_response(resp,test,error) if ( (resp) == (int16_t)-1 ) return -1; if ( !(test) ) { roar_err_set((error)); return -1; } |
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198 | |
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199 | // test for device interface version |
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200 | ret = __i2c_read(self, ADDR_IFVERSION); |
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201 | __check_response(ret, ret == 0, ROAR_ERROR_NSVERSION); |
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202 | |
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203 | // test for device overall status |
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204 | ret = __i2c_read(self, ADDR_DEVSTATUS); |
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205 | __check_response(ret, ret & DEVSTATUS_READY, ROAR_ERROR_BADSTATE); |
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206 | |
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207 | // Request device infos |
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208 | if ( __i2c_command(self, COMMAND_DEVINFO) == -1 ) |
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209 | return -1; |
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210 | |
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211 | // Check device infos |
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212 | // first check device type, then parent device type: |
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213 | vendor = __i2c_read(self, ADDR_VENDOR); |
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214 | type = __i2c_read(self, ADDR_TYPE); |
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215 | subtype = __i2c_read(self, ADDR_SUBTYPE); |
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216 | |
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217 | if ( __open_test_device_type(vendor, type, subtype) == -1 ) { |
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218 | vendor = __i2c_read(self, ADDR_PVENDOR); |
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219 | type = __i2c_read(self, ADDR_PTYPE); |
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220 | subtype = __i2c_read(self, ADDR_PSUBTYPE); |
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221 | |
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222 | if ( __open_test_device_type(vendor, type, subtype) == -1 ) |
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223 | return -1; |
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224 | } |
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225 | |
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226 | // check for DMX512 support: |
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227 | |
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228 | ret = __i2c_read(self, ADDR_CAPS0); |
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229 | __check_response(ret, ret & CAPS0_DMX512, ROAR_ERROR_TYPEMM); |
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230 | |
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231 | return 0; |
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232 | } |
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233 | |
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234 | static int __open_scan_devices(struct driver_i2cdmx * self) { |
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235 | uint8_t i; |
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236 | |
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237 | for (i = MIN_ADDR; i < MAX_ADDR; i++) { |
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238 | self->slave = i; |
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239 | |
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240 | if ( __i2c_set_slave(self) == -1 ) |
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241 | continue; |
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242 | |
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243 | if ( __open_test_device(self) == -1 ) |
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244 | continue; |
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245 | |
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246 | return 0; |
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247 | } |
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248 | |
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249 | self->slave = 0; |
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250 | roar_err_set(ROAR_ERROR_NOENT); |
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251 | return -1; |
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252 | } |
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253 | |
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254 | static int __open_device_and_slave(struct driver_i2cdmx * self, int autoconf, const char * device) { |
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255 | char filename[40]; |
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256 | char * p; |
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257 | int need_autoconf = 0; |
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258 | int ret; |
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259 | int err; |
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260 | |
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261 | // test if the device exist. |
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262 | if ( roar_vio_open_dstr_simple(&(self->vio), device, ROAR_VIOF_READWRITE) == 0 ) { |
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263 | need_autoconf = 1; |
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264 | } else { |
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265 | // the device doesn't exist. We guss it is in form $device/$slaveid. |
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266 | strncpy(filename, device, sizeof(filename)); |
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267 | p = strrchr(filename, '/'); |
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268 | if ( p == NULL ) { |
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269 | // it doesn't seem to be in the given form so it seems it was just a device name of an missingd evice. |
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270 | roar_err_set(ROAR_ERROR_NOENT); |
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271 | return -1; |
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272 | } |
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273 | |
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274 | *p = 0; |
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275 | p++; |
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276 | |
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277 | // now we have the device name in filename, and the slave ID in p. |
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278 | self->slave = atoi(p); |
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279 | |
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280 | // little test to protect the user from doing dumb things. |
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281 | if ( self->slave == 0 ) { |
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282 | roar_err_set(ROAR_ERROR_INVAL); |
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283 | return -1; |
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284 | } |
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285 | |
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286 | if ( roar_vio_open_dstr_simple(&(self->vio), filename, ROAR_VIOF_READWRITE) == -1 ) |
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287 | return -1; |
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288 | } |
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289 | |
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290 | // ok, the bus is now open. Let's open the device: |
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291 | |
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292 | if ( need_autoconf ) { |
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293 | ret = __open_scan_devices(self); |
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294 | } else { |
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295 | ret = __i2c_set_slave(self); |
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296 | if ( ret == 0 ) |
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297 | ret = __open_test_device(self); |
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298 | } |
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299 | |
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300 | if ( ret == -1 ) { |
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301 | err = roar_error; |
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302 | roar_vio_close(&(self->vio)); |
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303 | roar_err_set(err); |
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304 | } |
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305 | |
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306 | return ret; |
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307 | } |
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308 | |
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309 | static int __open_scan_busses(struct driver_i2cdmx * self) { |
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310 | char filename[20]; |
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311 | int i; |
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312 | int ret; |
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313 | |
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314 | for (i = 0; i < MAX_BUSSES; i++) { |
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315 | snprintf(filename, sizeof(filename), "/dev/i2c-%i", i); |
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316 | ret = __open_device_and_slave(self, 1, filename); |
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317 | if ( ret == 0 ) |
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318 | return 0; |
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319 | } |
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320 | |
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321 | roar_err_set(ROAR_ERROR_NOENT); |
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322 | return -1; |
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323 | } |
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324 | |
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325 | static int __i2c_write_channel(struct driver_i2cdmx * self, size_t channel, uint8_t value) { |
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326 | size_t bank, offset; |
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327 | |
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328 | bank = channel/32; |
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329 | offset = bank*32; |
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330 | |
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331 | if ( __i2c_write(self, ADDR_BANK, bank) == -1 ) |
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332 | return -1; |
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333 | |
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334 | return __i2c_write(self, ADDR_DATA+channel-offset, value); |
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335 | } |
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336 | |
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337 | static int __i2c_write_channel_block(struct driver_i2cdmx * self, size_t channel, const uint8_t * value) { |
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338 | size_t bank, offset; |
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339 | |
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340 | bank = channel/32; |
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341 | offset = bank*32; |
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342 | |
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343 | if ( __i2c_write(self, ADDR_BANK, bank) == -1 ) |
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344 | return -1; |
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345 | |
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346 | return __i2c_write_block(self, ADDR_DATA+channel-offset, value); |
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347 | } |
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348 | |
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349 | static ssize_t __vio_read (struct roar_vio_calls * vio, void *buf, size_t count) { |
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350 | struct driver_i2cdmx * self; |
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351 | |
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352 | if ( vio == NULL ) { |
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353 | roar_err_set(ROAR_ERROR_FAULT); |
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354 | return -1; |
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355 | } |
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356 | |
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357 | self = vio->inst; |
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358 | |
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359 | if ( count != 512 ) { |
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360 | roar_err_set(ROAR_ERROR_INVAL); |
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361 | return -1; |
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362 | } |
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363 | |
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364 | if ( __i2c_start_dmx(self) == -1 ) |
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365 | return -1; |
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366 | |
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367 | memset(buf, 0, count); // optimize this... |
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368 | #ifdef ROAR_HAVE_H_LINUX_SPI_SPIDEV |
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369 | memcpy(buf, self->rxtransfer+6, sizeof(self->rxtransfer)-6); |
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370 | #endif |
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371 | return 0; |
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372 | } |
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373 | |
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374 | static ssize_t __vio_write (struct roar_vio_calls * vio, void *buf, size_t count) { |
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375 | struct driver_i2cdmx * self; |
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376 | size_t i; |
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377 | // size_t endaddr; |
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378 | size_t todo; |
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379 | |
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380 | if ( vio == NULL ) { |
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381 | roar_err_set(ROAR_ERROR_FAULT); |
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382 | return -1; |
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383 | } |
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384 | |
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385 | self = vio->inst; |
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386 | |
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387 | if ( count != 512 ) { |
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388 | roar_err_set(ROAR_ERROR_INVAL); |
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389 | return -1; |
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390 | } |
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391 | |
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392 | if ( __i2c_start_dmx(self) == -1 ) |
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393 | return -1; |
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394 | |
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395 | /* |
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396 | for (i = self->startaddr, endaddr = self->startaddr + self->len; i < endaddr; i++) |
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397 | if ( __i2c_write_channel(self, i, ((uint8_t*)buf)[i]) == -1 ) |
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398 | return -1; |
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399 | */ |
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400 | |
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401 | i = self->startaddr; |
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402 | todo = self->len; |
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403 | while (todo) { |
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404 | if ( todo >= I2C_SMBUS_BLOCK_MAX ) { |
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405 | if ( __i2c_write_channel_block(self, i, &(((const uint8_t*)buf)[i])) == -1 ) |
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406 | return -1; |
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407 | i += I2C_SMBUS_BLOCK_MAX; |
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408 | todo -= I2C_SMBUS_BLOCK_MAX; |
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409 | } else { |
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410 | if ( __i2c_write_channel(self, i, ((uint8_t*)buf)[i]) == -1 ) |
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411 | return -1; |
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412 | i++; |
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413 | todo--; |
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414 | } |
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415 | } |
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416 | #ifdef ROAR_HAVE_H_LINUX_SPI_SPIDEV |
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417 | memcpy(self->txtransfer+6, buf, sizeof(self->txtransfer)-6); |
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418 | __spi_transfer(self, 0, 0, TRANSFER_CHANS); |
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419 | #endif |
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420 | |
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421 | return count; |
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422 | } |
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423 | |
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424 | static int __vio_ctl (struct roar_vio_calls * vio, roar_vio_ctl_t cmd, void * data) { |
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425 | struct driver_i2cdmx * self; |
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426 | |
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427 | if ( vio == NULL ) { |
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428 | roar_err_set(ROAR_ERROR_FAULT); |
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429 | return -1; |
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430 | } |
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431 | |
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432 | self = vio->inst; |
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433 | |
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434 | switch (cmd) { |
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435 | case ROAR_VIO_CTL_SET_SSTREAM: |
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436 | if ( ROAR_STREAM(data)->dir != ROAR_DIR_LIGHT_OUT && ROAR_STREAM(data)->dir != ROAR_DIR_LIGHT_IN ) { |
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437 | ROAR_STREAM(data)->dir = ROAR_DIR_LIGHT_OUT; |
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438 | } |
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439 | ROAR_STREAM_SERVER(data)->codec_orgi = ROAR_CODEC_DMX512; |
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440 | break; |
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441 | default: |
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442 | roar_err_set(ROAR_ERROR_BADRQC); |
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443 | return -1; |
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444 | } |
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445 | |
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446 | return 0; |
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447 | } |
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448 | |
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449 | static int __vio_close (struct roar_vio_calls * vio) { |
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450 | struct driver_i2cdmx * self = vio->inst; |
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451 | roar_vio_close(&(self->vio)); |
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452 | if ( self->have_spi ) |
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453 | roar_vio_close(&(self->spi)); |
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454 | roar_mm_free(self); |
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455 | return 0; |
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456 | } |
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457 | |
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458 | int driver_i2cdmx_open_vio (struct roar_vio_calls * inst, char * device, struct roar_audio_info * info, int fh, struct roar_stream_server * sstream) { |
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459 | struct driver_i2cdmx * self; |
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460 | int autoconf = 1; |
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461 | int ret; |
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462 | |
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463 | if ( fh != -1 ) { |
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464 | roar_err_set(ROAR_ERROR_NOSYS); |
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465 | return -1; |
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466 | } |
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467 | |
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468 | self = roar_mm_malloc(sizeof(struct driver_i2cdmx)); |
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469 | if ( self == NULL ) { |
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470 | return -1; |
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471 | } |
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472 | memset(self, 0, sizeof(*self)); |
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473 | self->have_spi = 0; |
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474 | self->startaddr = 0; |
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475 | self->len = info->channels; |
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476 | |
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477 | info->bits = 8; |
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478 | info->codec = ROAR_CODEC_DMX512; |
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479 | |
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480 | if ( device == NULL && !autoconf ) { |
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481 | device = DEFAULT_DEVICE; |
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482 | } |
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483 | |
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484 | if ( device == NULL ) { |
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485 | ret = __open_scan_busses(self); |
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486 | } else { |
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487 | ret = __open_device_and_slave(self, autoconf, device); |
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488 | } |
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489 | |
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490 | if ( ret == -1 ) { |
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491 | roar_mm_free_noerror(self); |
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492 | return -1; |
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493 | } |
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494 | |
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495 | #if defined(ROAR_HAVE_H_LINUX_SPI_SPIDEV) && defined(SPI_DEVICE) |
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496 | if ( roar_vio_open_dstr_simple(&(self->spi), SPI_DEVICE, ROAR_VIOF_READWRITE) == 0 ) |
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497 | self->have_spi = 1; |
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498 | #endif |
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499 | |
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500 | roar_vio_clear_calls(inst); |
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501 | inst->inst = self; |
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502 | inst->read = __vio_read; |
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503 | inst->write = __vio_write; |
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504 | inst->close = __vio_close; |
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505 | inst->ctl = __vio_ctl; |
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506 | |
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507 | return 0; |
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508 | } |
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509 | #endif |
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