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 | #define DEFAULT_DEVICE "/dev/i2c-1" |
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34 | |
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35 | #define DEV_TYPE 0x01 /* RI2C_DEV_BRIDGE */ |
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36 | #define DEV_SUBTYPE 0x01 /* RI2C_SUBTYPE_BRIDGE_CONVERTER */ |
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37 | #define DEVSTATUS_READY 0x01 /* RI2C_STATUS0_DEVICE_READY */ |
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38 | #define CAPS0_DMX512 0x10 /* RI2C_CAPS0_BRIDGE_DMX512 */ |
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39 | |
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40 | #define MIN_ADDR 0x20 |
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41 | #define MAX_ADDR 0x70 |
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42 | #define MAX_BUSSES 8 |
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43 | |
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44 | #define ADDR_IFVERSION 0 |
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45 | #define ADDR_DEVSTATUS 1 |
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46 | #define ADDR_COMMAND 2 |
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47 | #define ADDR_DEVERROR 3 |
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48 | #define ADDR_BANK 4 |
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49 | #define ADDR_DATA 5 |
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50 | #define ADDR_VENDOR (ADDR_BANK+2) |
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51 | #define ADDR_TYPE (ADDR_BANK+3) |
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52 | #define ADDR_SUBTYPE (ADDR_BANK+4) |
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53 | #define ADDR_PVENDOR (ADDR_BANK+10) |
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54 | #define ADDR_PTYPE (ADDR_BANK+11) |
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55 | #define ADDR_PSUBTYPE (ADDR_BANK+12) |
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56 | #define ADDR_CAPS0 (ADDR_BANK+13) |
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57 | |
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58 | #define COMMAND_DEVINFO 0x00 |
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59 | #define COMMAND_DMX 0x3f |
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60 | |
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61 | struct driver_i2cdmx { |
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62 | struct roar_vio_calls vio; |
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63 | uint8_t slave; |
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64 | size_t startaddr; |
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65 | size_t len; |
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66 | }; |
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67 | |
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68 | static inline int __i2c_set_slave(struct driver_i2cdmx * self) { |
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69 | struct roar_vio_sysio_ioctl ctl = {.cmd = I2C_SLAVE, .argp = (void*)(int)self->slave}; |
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70 | |
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71 | return roar_vio_ctl(&(self->vio), ROAR_VIO_CTL_SYSIO_IOCTL, &ctl); |
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72 | } |
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73 | |
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74 | static inline int16_t __i2c_read(struct driver_i2cdmx * self, size_t off) { |
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75 | union i2c_smbus_data data = {.byte = 0}; |
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76 | struct i2c_smbus_ioctl_data args = {.read_write = I2C_SMBUS_READ, .command = off, .size = I2C_SMBUS_BYTE_DATA, .data = &data}; |
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77 | struct roar_vio_sysio_ioctl ctl = {.cmd = I2C_SMBUS, .argp = &args}; |
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78 | int ret = roar_vio_ctl(&(self->vio), ROAR_VIO_CTL_SYSIO_IOCTL, &ctl); |
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79 | |
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80 | if ( ret == -1 ) |
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81 | return (int16_t)-1; |
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82 | |
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83 | return (int16_t)(uint16_t)(uint8_t)data.byte; |
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84 | } |
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85 | |
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86 | static inline int __i2c_write(struct driver_i2cdmx * self, size_t off, const uint8_t value) { |
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87 | union i2c_smbus_data data = {.byte = value}; |
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88 | struct i2c_smbus_ioctl_data args = {.read_write = I2C_SMBUS_WRITE, .command = off, .size = I2C_SMBUS_BYTE_DATA, .data = &data}; |
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89 | struct roar_vio_sysio_ioctl ctl = {.cmd = I2C_SMBUS, .argp = &args}; |
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90 | |
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91 | return roar_vio_ctl(&(self->vio), ROAR_VIO_CTL_SYSIO_IOCTL, &ctl); |
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92 | } |
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93 | |
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94 | static inline int __i2c_command(struct driver_i2cdmx * self, uint8_t command) { |
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95 | int16_t ret; |
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96 | |
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97 | if ( __i2c_write(self, ADDR_COMMAND, command) == -1 ) |
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98 | return -1; |
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99 | |
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100 | ret = __i2c_read(self, ADDR_DEVERROR); |
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101 | if ( ret == (int16_t)-1 ) |
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102 | return -1; |
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103 | |
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104 | if ( ret == ROAR_ERROR_NONE ) |
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105 | return 0; |
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106 | |
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107 | roar_err_set(ret); |
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108 | return -1; |
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109 | } |
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110 | |
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111 | static inline int __i2c_start_dmx(struct driver_i2cdmx * self) { |
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112 | return __i2c_command(self, COMMAND_DMX); |
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113 | } |
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114 | |
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115 | static int __open_test_device_type(int16_t vendor, int16_t type, int16_t subtype) { |
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116 | if ( vendor == -1 || type == -1 || subtype == -1 ) |
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117 | return -1; |
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118 | |
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119 | if ( vendor != ROAR_VID_ROARAUDIO || type != DEV_TYPE || subtype != DEV_SUBTYPE ) { |
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120 | roar_err_set(ROAR_ERROR_TYPEMM); |
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121 | return -1; |
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122 | } |
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123 | |
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124 | return 0; |
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125 | } |
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126 | |
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127 | static int __open_test_device(struct driver_i2cdmx * self) { |
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128 | int16_t ret; |
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129 | int16_t vendor, type, subtype; |
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130 | |
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131 | #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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132 | |
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133 | // test for device interface version |
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134 | ret = __i2c_read(self, ADDR_IFVERSION); |
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135 | __check_response(ret, ret == 0, ROAR_ERROR_NSVERSION); |
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136 | |
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137 | // test for device overall status |
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138 | ret = __i2c_read(self, ADDR_DEVSTATUS); |
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139 | __check_response(ret, ret & DEVSTATUS_READY, ROAR_ERROR_BADSTATE); |
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140 | |
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141 | // Request device infos |
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142 | if ( __i2c_command(self, COMMAND_DEVINFO) == -1 ) |
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143 | return -1; |
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144 | |
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145 | // Check device infos |
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146 | // first check device type, then parent device type: |
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147 | vendor = __i2c_read(self, ADDR_VENDOR); |
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148 | type = __i2c_read(self, ADDR_TYPE); |
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149 | subtype = __i2c_read(self, ADDR_SUBTYPE); |
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150 | |
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151 | if ( __open_test_device_type(vendor, type, subtype) == -1 ) { |
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152 | vendor = __i2c_read(self, ADDR_PVENDOR); |
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153 | type = __i2c_read(self, ADDR_PTYPE); |
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154 | subtype = __i2c_read(self, ADDR_PSUBTYPE); |
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155 | |
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156 | if ( __open_test_device_type(vendor, type, subtype) == -1 ) |
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157 | return -1; |
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158 | } |
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159 | |
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160 | // check for DMX512 support: |
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161 | |
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162 | ret = __i2c_read(self, ADDR_CAPS0); |
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163 | __check_response(ret, ret & CAPS0_DMX512, ROAR_ERROR_TYPEMM); |
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164 | |
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165 | return 0; |
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166 | } |
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167 | |
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168 | static int __open_scan_devices(struct driver_i2cdmx * self) { |
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169 | uint8_t i; |
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170 | |
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171 | for (i = MIN_ADDR; i < MAX_ADDR; i++) { |
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172 | self->slave = i; |
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173 | |
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174 | if ( __i2c_set_slave(self) == -1 ) |
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175 | continue; |
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176 | |
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177 | if ( __open_test_device(self) == -1 ) |
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178 | continue; |
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179 | |
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180 | return 0; |
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181 | } |
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182 | |
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183 | self->slave = 0; |
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184 | roar_err_set(ROAR_ERROR_NOENT); |
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185 | return -1; |
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186 | } |
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187 | |
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188 | static int __open_device_and_slave(struct driver_i2cdmx * self, int autoconf, const char * device) { |
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189 | char filename[40]; |
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190 | char * p; |
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191 | int need_autoconf = 0; |
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192 | int ret; |
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193 | int err; |
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194 | |
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195 | // test if the device exist. |
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196 | if ( roar_vio_open_dstr_simple(&(self->vio), device, ROAR_VIOF_READWRITE) == 0 ) { |
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197 | need_autoconf = 1; |
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198 | } else { |
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199 | // the device doesn't exist. We guss it is in form $device/$slaveid. |
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200 | strncpy(filename, device, sizeof(filename)); |
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201 | p = strrchr(filename, '/'); |
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202 | if ( p == NULL ) { |
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203 | // 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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204 | roar_err_set(ROAR_ERROR_NOENT); |
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205 | return -1; |
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206 | } |
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207 | |
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208 | *p = 0; |
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209 | p++; |
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210 | |
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211 | // now we have the device name in filename, and the slave ID in p. |
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212 | self->slave = atoi(p); |
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213 | |
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214 | // little test to protect the user from doing dumb things. |
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215 | if ( self->slave == 0 ) { |
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216 | roar_err_set(ROAR_ERROR_INVAL); |
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217 | return -1; |
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218 | } |
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219 | |
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220 | if ( roar_vio_open_dstr_simple(&(self->vio), filename, ROAR_VIOF_READWRITE) == -1 ) |
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221 | return -1; |
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222 | } |
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223 | |
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224 | // ok, the bus is now open. Let's open the device: |
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225 | |
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226 | if ( need_autoconf ) { |
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227 | ret = __open_scan_devices(self); |
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228 | } else { |
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229 | ret = __i2c_set_slave(self); |
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230 | if ( ret == 0 ) |
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231 | ret = __open_test_device(self); |
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232 | } |
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233 | |
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234 | if ( ret == -1 ) { |
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235 | err = roar_error; |
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236 | roar_vio_close(&(self->vio)); |
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237 | roar_err_set(err); |
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238 | } |
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239 | |
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240 | return ret; |
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241 | } |
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242 | |
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243 | static int __open_scan_busses(struct driver_i2cdmx * self) { |
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244 | char filename[20]; |
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245 | int i; |
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246 | int ret; |
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247 | |
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248 | for (i = 0; i < MAX_BUSSES; i++) { |
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249 | snprintf(filename, sizeof(filename), "/dev/i2c-%i", i); |
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250 | ret = __open_device_and_slave(self, 1, filename); |
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251 | if ( ret == 0 ) |
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252 | return 0; |
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253 | } |
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254 | |
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255 | roar_err_set(ROAR_ERROR_NOENT); |
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256 | return -1; |
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257 | } |
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258 | |
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259 | static int __i2c_write_channel(struct driver_i2cdmx * self, size_t channel, uint8_t value) { |
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260 | size_t bank, offset; |
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261 | |
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262 | bank = channel/32; |
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263 | offset = bank*32; |
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264 | |
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265 | if ( __i2c_write(self, ADDR_BANK, bank) == -1 ) |
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266 | return -1; |
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267 | |
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268 | return __i2c_write(self, ADDR_DATA+channel-offset, value); |
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269 | } |
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270 | |
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271 | static ssize_t __vio_read (struct roar_vio_calls * vio, void *buf, size_t count) { |
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272 | struct driver_i2cdmx * self; |
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273 | |
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274 | if ( vio == NULL ) { |
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275 | roar_err_set(ROAR_ERROR_FAULT); |
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276 | return -1; |
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277 | } |
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278 | |
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279 | self = vio->inst; |
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280 | |
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281 | if ( __i2c_start_dmx(self) == -1 ) |
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282 | return -1; |
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283 | |
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284 | roar_err_set(ROAR_ERROR_NOSYS); |
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285 | return -1; |
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286 | } |
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287 | |
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288 | static ssize_t __vio_write (struct roar_vio_calls * vio, void *buf, size_t count) { |
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289 | struct driver_i2cdmx * self; |
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290 | size_t i; |
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291 | size_t endaddr; |
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292 | |
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293 | if ( vio == NULL ) { |
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294 | roar_err_set(ROAR_ERROR_FAULT); |
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295 | return -1; |
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296 | } |
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297 | |
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298 | self = vio->inst; |
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299 | |
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300 | if ( count != 512 ) { |
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301 | roar_err_set(ROAR_ERROR_INVAL); |
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302 | return -1; |
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303 | } |
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304 | |
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305 | if ( __i2c_start_dmx(self) == -1 ) |
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306 | return -1; |
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307 | |
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308 | for (i = self->startaddr, endaddr = self->startaddr + self->len; i < endaddr; i++) |
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309 | if ( __i2c_write_channel(self, i, ((uint8_t*)buf)[i]) == -1 ) |
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310 | return -1; |
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311 | |
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312 | return count; |
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313 | } |
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314 | |
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315 | static int __vio_ctl (struct roar_vio_calls * vio, roar_vio_ctl_t cmd, void * data) { |
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316 | struct driver_i2cdmx * self; |
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317 | |
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318 | if ( vio == NULL ) { |
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319 | roar_err_set(ROAR_ERROR_FAULT); |
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320 | return -1; |
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321 | } |
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322 | |
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323 | self = vio->inst; |
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324 | |
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325 | switch (cmd) { |
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326 | case ROAR_VIO_CTL_SET_SSTREAM: |
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327 | if ( ROAR_STREAM(data)->dir != ROAR_DIR_LIGHT_OUT && ROAR_STREAM(data)->dir != ROAR_DIR_LIGHT_IN ) { |
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328 | ROAR_STREAM(data)->dir = ROAR_DIR_LIGHT_OUT; |
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329 | } |
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330 | ROAR_STREAM_SERVER(data)->codec_orgi = ROAR_CODEC_DMX512; |
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331 | break; |
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332 | default: |
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333 | roar_err_set(ROAR_ERROR_BADRQC); |
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334 | return -1; |
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335 | } |
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336 | |
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337 | return 0; |
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338 | } |
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339 | |
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340 | static int __vio_close (struct roar_vio_calls * vio) { |
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341 | struct driver_i2cdmx * self = vio->inst; |
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342 | roar_vio_close(&(self->vio)); |
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343 | roar_mm_free(self); |
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344 | return 0; |
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345 | } |
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346 | |
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347 | 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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348 | struct driver_i2cdmx * self; |
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349 | int autoconf = 1; |
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350 | int ret; |
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351 | |
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352 | if ( fh != -1 ) { |
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353 | roar_err_set(ROAR_ERROR_NOSYS); |
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354 | return -1; |
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355 | } |
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356 | |
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357 | self = roar_mm_malloc(sizeof(struct driver_i2cdmx)); |
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358 | if ( self == NULL ) { |
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359 | return -1; |
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360 | } |
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361 | memset(self, 0, sizeof(*self)); |
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362 | self->startaddr = 0; |
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363 | self->len = info->channels; |
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364 | |
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365 | info->bits = 8; |
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366 | info->codec = ROAR_CODEC_DMX512; |
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367 | |
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368 | if ( device == NULL && !autoconf ) { |
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369 | device = DEFAULT_DEVICE; |
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370 | } |
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371 | |
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372 | if ( device == NULL ) { |
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373 | ret = __open_scan_busses(self); |
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374 | } else { |
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375 | ret = __open_device_and_slave(self, autoconf, device); |
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376 | } |
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377 | |
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378 | if ( ret == -1 ) { |
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379 | roar_mm_free_noerror(self); |
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380 | return -1; |
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381 | } |
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382 | |
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383 | roar_vio_clear_calls(inst); |
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384 | inst->inst = self; |
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385 | inst->read = __vio_read; |
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386 | inst->write = __vio_write; |
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387 | inst->close = __vio_close; |
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388 | inst->ctl = __vio_ctl; |
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389 | |
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390 | return 0; |
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391 | } |
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392 | #endif |
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