[5902] | 1 | //piface.c: |
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| 2 | |
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| 3 | /* |
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[5961] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2013-2014 |
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[5902] | 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 <roaraudio.h> |
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| 27 | |
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| 28 | #ifdef ROAR_HAVE_H_LINUX_SPI_SPIDEV |
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| 29 | #include <linux/spi/spidev.h> |
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| 30 | #include <sys/ioctl.h> |
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| 31 | |
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| 32 | #define NUM_PORTS (8+8+1) |
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| 33 | |
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| 34 | #define TRANSFER_LEN 3 |
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| 35 | #define TRANSFER_DELAY 5 |
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| 36 | #define TRANSFER_SPEED 1000000 |
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| 37 | #define TRANSFER_BPW 8 |
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| 38 | |
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| 39 | #define SPI_WRITE_CMD 0x40 |
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| 40 | #define SPI_READ_CMD 0x41 |
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| 41 | |
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| 42 | #define IODIRA 0x00 // I/O direction A |
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| 43 | #define IODIRB 0x01 // I/O direction B |
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| 44 | #define IOCON 0x0A // I/O config |
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| 45 | #define GPIOA 0x12 // port A |
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| 46 | #define GPIOB 0x13 // port B |
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| 47 | #define GPPUA 0x0C // port A pullups |
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| 48 | #define GPPUB 0x0D // port B pullups |
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| 49 | #define OUTPUT_PORT GPIOA |
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| 50 | #define INPUT_PORT GPIOB |
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| 51 | |
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| 52 | struct state { |
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| 53 | int inited; |
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| 54 | int bus; |
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| 55 | int device; |
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| 56 | struct roar_vio_calls vio_store; |
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| 57 | struct roar_vio_calls * vio; |
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| 58 | unsigned char buffer_output; |
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| 59 | unsigned char buffer_input; |
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| 60 | struct roar_service_gpio_port ports[NUM_PORTS]; |
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| 61 | }; |
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| 62 | |
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| 63 | static struct state * state = NULL; |
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| 64 | static struct state state_init = { |
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| 65 | .inited = 0, |
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| 66 | .bus = 0, |
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| 67 | .device = 0, |
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| 68 | .vio = NULL, |
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| 69 | .buffer_output = 0x00, |
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| 70 | .buffer_input = 0x00, |
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| 71 | .ports = { |
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| 72 | // inputs: |
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| 73 | {.id = 0, .name = "gpin0", .mode = ROAR_SERVICE_GPIO_FINPUT|ROAR_SERVICE_GPIO_FPULLUP, .unit = NULL, .type = ROAR_SERVICE_GPIO_TBOOL, .state = ROAR_SERVICE_GPIO_SUNINITED, .irange_min = 0, .irange_max = 1, .frange_min = 0, .frange_max = 1}, |
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| 74 | {.id = 1, .name = "gpin1", .mode = ROAR_SERVICE_GPIO_FINPUT|ROAR_SERVICE_GPIO_FPULLUP, .unit = NULL, .type = ROAR_SERVICE_GPIO_TBOOL, .state = ROAR_SERVICE_GPIO_SUNINITED, .irange_min = 0, .irange_max = 1, .frange_min = 0, .frange_max = 1}, |
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| 75 | {.id = 2, .name = "gpin2", .mode = ROAR_SERVICE_GPIO_FINPUT|ROAR_SERVICE_GPIO_FPULLUP, .unit = NULL, .type = ROAR_SERVICE_GPIO_TBOOL, .state = ROAR_SERVICE_GPIO_SUNINITED, .irange_min = 0, .irange_max = 1, .frange_min = 0, .frange_max = 1}, |
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| 76 | {.id = 3, .name = "gpin3", .mode = ROAR_SERVICE_GPIO_FINPUT|ROAR_SERVICE_GPIO_FPULLUP, .unit = NULL, .type = ROAR_SERVICE_GPIO_TBOOL, .state = ROAR_SERVICE_GPIO_SUNINITED, .irange_min = 0, .irange_max = 1, .frange_min = 0, .frange_max = 1}, |
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| 77 | {.id = 4, .name = "gpin4", .mode = ROAR_SERVICE_GPIO_FINPUT|ROAR_SERVICE_GPIO_FPULLUP, .unit = NULL, .type = ROAR_SERVICE_GPIO_TBOOL, .state = ROAR_SERVICE_GPIO_SUNINITED, .irange_min = 0, .irange_max = 1, .frange_min = 0, .frange_max = 1}, |
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| 78 | {.id = 5, .name = "gpin5", .mode = ROAR_SERVICE_GPIO_FINPUT|ROAR_SERVICE_GPIO_FPULLUP, .unit = NULL, .type = ROAR_SERVICE_GPIO_TBOOL, .state = ROAR_SERVICE_GPIO_SUNINITED, .irange_min = 0, .irange_max = 1, .frange_min = 0, .frange_max = 1}, |
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| 79 | {.id = 6, .name = "gpin6", .mode = ROAR_SERVICE_GPIO_FINPUT|ROAR_SERVICE_GPIO_FPULLUP, .unit = NULL, .type = ROAR_SERVICE_GPIO_TBOOL, .state = ROAR_SERVICE_GPIO_SUNINITED, .irange_min = 0, .irange_max = 1, .frange_min = 0, .frange_max = 1}, |
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| 80 | {.id = 7, .name = "gpin7", .mode = ROAR_SERVICE_GPIO_FINPUT|ROAR_SERVICE_GPIO_FPULLUP, .unit = NULL, .type = ROAR_SERVICE_GPIO_TBOOL, .state = ROAR_SERVICE_GPIO_SUNINITED, .irange_min = 0, .irange_max = 1, .frange_min = 0, .frange_max = 1}, |
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| 81 | |
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| 82 | // outputs: |
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| 83 | {.id = 8, .name = "gpout0", .mode = ROAR_SERVICE_GPIO_FOUTPUT, .unit = NULL, .type = ROAR_SERVICE_GPIO_TBOOL, .state = ROAR_SERVICE_GPIO_SUNINITED, .irange_min = 0, .irange_max = 1, .frange_min = 0, .frange_max = 1}, |
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| 84 | {.id = 9, .name = "gpout1", .mode = ROAR_SERVICE_GPIO_FOUTPUT, .unit = NULL, .type = ROAR_SERVICE_GPIO_TBOOL, .state = ROAR_SERVICE_GPIO_SUNINITED, .irange_min = 0, .irange_max = 1, .frange_min = 0, .frange_max = 1}, |
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| 85 | {.id = 10, .name = "gpout2", .mode = ROAR_SERVICE_GPIO_FOUTPUT, .unit = NULL, .type = ROAR_SERVICE_GPIO_TBOOL, .state = ROAR_SERVICE_GPIO_SUNINITED, .irange_min = 0, .irange_max = 1, .frange_min = 0, .frange_max = 1}, |
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| 86 | {.id = 11, .name = "gpout3", .mode = ROAR_SERVICE_GPIO_FOUTPUT, .unit = NULL, .type = ROAR_SERVICE_GPIO_TBOOL, .state = ROAR_SERVICE_GPIO_SUNINITED, .irange_min = 0, .irange_max = 1, .frange_min = 0, .frange_max = 1}, |
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| 87 | {.id = 12, .name = "gpout4", .mode = ROAR_SERVICE_GPIO_FOUTPUT, .unit = NULL, .type = ROAR_SERVICE_GPIO_TBOOL, .state = ROAR_SERVICE_GPIO_SUNINITED, .irange_min = 0, .irange_max = 1, .frange_min = 0, .frange_max = 1}, |
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| 88 | {.id = 13, .name = "gpout5", .mode = ROAR_SERVICE_GPIO_FOUTPUT, .unit = NULL, .type = ROAR_SERVICE_GPIO_TBOOL, .state = ROAR_SERVICE_GPIO_SUNINITED, .irange_min = 0, .irange_max = 1, .frange_min = 0, .frange_max = 1}, |
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| 89 | {.id = 14, .name = "gpout6", .mode = ROAR_SERVICE_GPIO_FOUTPUT, .unit = NULL, .type = ROAR_SERVICE_GPIO_TBOOL, .state = ROAR_SERVICE_GPIO_SUNINITED, .irange_min = 0, .irange_max = 1, .frange_min = 0, .frange_max = 1}, |
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| 90 | {.id = 15, .name = "gpout7", .mode = ROAR_SERVICE_GPIO_FOUTPUT, .unit = NULL, .type = ROAR_SERVICE_GPIO_TBOOL, .state = ROAR_SERVICE_GPIO_SUNINITED, .irange_min = 0, .irange_max = 1, .frange_min = 0, .frange_max = 1}, |
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| 91 | |
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| 92 | // special: |
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| 93 | {.id = 16, .name = "bar0", .mode = ROAR_SERVICE_GPIO_FOUTPUT, .unit = NULL, .type = ROAR_SERVICE_GPIO_TINT, .state = ROAR_SERVICE_GPIO_SUNINITED, .irange_min = 0, .irange_max = 8, .frange_min = 0, .frange_max = 8} |
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| 94 | } |
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| 95 | }; |
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| 96 | |
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| 97 | static int piface__transfer(char cmd, char port, char value) { |
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| 98 | unsigned char txbuffer[3] = {cmd, port, value}; |
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| 99 | unsigned char rxbuffer[3]; |
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| 100 | struct spi_ioc_transfer transfer_buffer = { |
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| 101 | .tx_buf = (unsigned long) txbuffer, |
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| 102 | .rx_buf = (unsigned long) rxbuffer, |
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| 103 | .len = TRANSFER_LEN, |
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| 104 | .delay_usecs = TRANSFER_DELAY, |
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| 105 | .speed_hz = TRANSFER_SPEED, |
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| 106 | .bits_per_word = TRANSFER_BPW, |
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| 107 | }; |
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| 108 | struct roar_vio_sysio_ioctl ctl = {.cmd = SPI_IOC_MESSAGE(1), .argp = &transfer_buffer}; |
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| 109 | |
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| 110 | if ( roar_vio_ctl(state->vio, 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 (unsigned int)rxbuffer[2]; |
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| 114 | } |
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| 115 | |
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| 116 | static int piface__init(void) { |
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| 117 | char path[80]; |
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| 118 | |
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| 119 | if ( state->inited ) { |
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| 120 | roar_err_set(ROAR_ERROR_ALREADY); |
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| 121 | return -1; |
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| 122 | } |
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| 123 | |
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| 124 | snprintf(path, sizeof(path), "file://dev/spidev%i.%i", state->bus, state->device); |
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| 125 | |
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| 126 | state->vio = &(state->vio_store); |
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| 127 | if ( roar_vio_open_dstr_simple(state->vio, path, ROAR_VIOF_READWRITE) == -1 ) |
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| 128 | return -1; |
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| 129 | |
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| 130 | piface__transfer(SPI_WRITE_CMD, IOCON, 8); // enable hardware addressing |
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| 131 | piface__transfer(SPI_WRITE_CMD, GPIOA, 0x00); // turn on port A |
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| 132 | piface__transfer(SPI_WRITE_CMD, IODIRA, 0); // set port A as an output |
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| 133 | piface__transfer(SPI_WRITE_CMD, IODIRB, 0xFF); // set port B as an input |
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| 134 | piface__transfer(SPI_WRITE_CMD, GPPUB, 0xFF); // turn on port B pullups |
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| 135 | piface__transfer(SPI_WRITE_CMD, OUTPUT_PORT, 0x00); // turn of all outputs. |
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| 136 | |
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| 137 | state->inited = 1; |
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| 138 | |
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| 139 | return 0; |
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| 140 | } |
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| 141 | |
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| 142 | static int piface__free(void) { |
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| 143 | if ( !state->inited ) { |
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| 144 | roar_err_set(ROAR_ERROR_BADSTATE); |
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| 145 | return -1; |
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| 146 | } |
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| 147 | |
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| 148 | roar_vio_close(state->vio); |
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| 149 | |
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| 150 | state->inited = 0; |
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| 151 | |
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| 152 | return 0; |
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| 153 | } |
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| 154 | |
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| 155 | static void piface__write_output(unsigned char val) { |
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| 156 | piface__transfer(SPI_WRITE_CMD, OUTPUT_PORT, state->buffer_output = val); |
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| 157 | } |
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| 158 | |
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| 159 | static unsigned char piface__read_output(void) { |
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| 160 | return state->buffer_output = piface__transfer(SPI_READ_CMD, OUTPUT_PORT, 0xFF); |
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| 161 | } |
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| 162 | |
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| 163 | static unsigned char piface__read_input(void) { |
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[5903] | 164 | return state->buffer_input = piface__transfer(SPI_READ_CMD, INPUT_PORT, 0xFF) ^ 0xFF; |
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[5902] | 165 | } |
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| 166 | |
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| 167 | static inline int __portval_to_bool(const struct roar_service_gpio_port * port, unsigned int val) { |
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| 168 | int bit = 1 << (port->id & 0x07); |
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| 169 | return val & bit ? 1 : 0; |
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| 170 | } |
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| 171 | |
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[5904] | 172 | static inline unsigned char __render_bar(int bits) { |
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| 173 | unsigned char ret = 0; |
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| 174 | int i; |
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| 175 | |
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| 176 | // this is a generic version. As long as this is not called too often it should work fine. |
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| 177 | |
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| 178 | for (i = 0; i < bits; i++) { |
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| 179 | ret <<= 1; |
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| 180 | ret |= 1; |
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| 181 | } |
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| 182 | |
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| 183 | return ret; |
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| 184 | } |
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| 185 | |
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[5902] | 186 | // get list of gpio IDs. |
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| 187 | // buffer is passed as ids, buffer size (in elements) is passed as len. |
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| 188 | // returns the number of elements stored in ids or -1 on error. |
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| 189 | static ssize_t __list(int * ids, size_t len) { |
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| 190 | size_t i; |
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| 191 | |
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| 192 | if ( ids == NULL ) { |
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| 193 | roar_err_set(ROAR_ERROR_FAULT); |
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| 194 | return -1; |
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| 195 | } |
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| 196 | |
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| 197 | for (i = 0; i < len && i < NUM_PORTS; i++) |
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| 198 | ids[i] = i; |
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| 199 | |
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| 200 | return i; |
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| 201 | } |
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| 202 | |
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| 203 | // get the number of gpios. See also comments above on what. |
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| 204 | static ssize_t __num(enum roar_service_num what) { |
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| 205 | (void)what; |
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| 206 | |
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| 207 | return NUM_PORTS; // 8 inputs, 8 outputs and a a virtual bar |
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| 208 | } |
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| 209 | // get a gpio by ID. The object returned is a copy and must not be motified or freed. |
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| 210 | static int __get(int id, struct roar_service_gpio_port * port) { |
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| 211 | if ( id < 0 || id >= NUM_PORTS ) { |
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| 212 | roar_err_set(ROAR_ERROR_RANGE); |
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| 213 | return -1; |
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| 214 | } |
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| 215 | |
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| 216 | if ( port == NULL ) { |
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| 217 | roar_err_set(ROAR_ERROR_FAULT); |
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| 218 | return -1; |
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| 219 | } |
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| 220 | |
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| 221 | *port = state->ports[id]; |
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| 222 | return 0; |
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| 223 | } |
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| 224 | |
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| 225 | // Sets up ports. |
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| 226 | // the controler should set mode and state of port to given target mode and state. |
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| 227 | // If id is given as -1 this is about the controler. mode MUST NOT contain any |
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| 228 | // flags beside ROAR_SERVICE_GPIO_FCACHED. If ROAR_SERVICE_GPIO_FCACHED |
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| 229 | // is set it is applied all ports. |
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| 230 | static int __setup(int id, uint_least32_t mode, enum roar_service_gpio_state tstate) { |
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| 231 | size_t i; |
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| 232 | |
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| 233 | if ( id < -1 || id >= NUM_PORTS ) { |
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| 234 | roar_err_set(ROAR_ERROR_RANGE); |
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| 235 | return -1; |
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| 236 | } |
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| 237 | |
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| 238 | if ( id == -1 ) { |
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| 239 | if ( mode != 0 && mode != ROAR_SERVICE_GPIO_FCACHED ) { |
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| 240 | roar_err_set(ROAR_ERROR_INVAL); |
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| 241 | return -1; |
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| 242 | } |
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| 243 | |
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| 244 | switch (tstate) { |
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| 245 | case ROAR_SERVICE_GPIO_SREADY: |
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| 246 | if ( state->inited ) |
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| 247 | return 0; |
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| 248 | if ( piface__init() == -1 ) |
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| 249 | return -1; |
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| 250 | for (i = 0; i < NUM_PORTS; i++) { |
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| 251 | state->ports[i].mode |= ROAR_SERVICE_GPIO_FCACHED; |
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| 252 | state->ports[i].mode -= ROAR_SERVICE_GPIO_FCACHED; |
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| 253 | state->ports[i].mode |= mode; |
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| 254 | } |
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| 255 | return 0; |
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| 256 | case ROAR_SERVICE_GPIO_SUNINITED: |
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| 257 | if ( !state->inited ) |
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| 258 | return 0; |
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| 259 | return piface__free(); |
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| 260 | default: |
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| 261 | roar_err_set(ROAR_ERROR_INVAL); |
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| 262 | return -1; |
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| 263 | break; |
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| 264 | } |
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| 265 | } |
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| 266 | |
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| 267 | roar_err_set(ROAR_ERROR_NOSYS); |
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| 268 | return -1; |
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| 269 | } |
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| 270 | |
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| 271 | // get value of port (input or output) as int or float. |
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| 272 | static int __get_int(int id) { |
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| 273 | const struct roar_service_gpio_port * port; |
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| 274 | unsigned char val; |
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| 275 | |
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| 276 | if ( !state->inited ) { |
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| 277 | roar_err_set(ROAR_ERROR_BADSTATE); |
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| 278 | return -1; |
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| 279 | } |
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| 280 | |
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| 281 | if ( id < 0 || id >= NUM_PORTS ) { |
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| 282 | roar_err_set(ROAR_ERROR_RANGE); |
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| 283 | return -1; |
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| 284 | } |
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| 285 | |
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| 286 | port = &(state->ports[id]); |
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| 287 | |
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| 288 | if ( port->type != ROAR_SERVICE_GPIO_TBOOL ) { |
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| 289 | roar_err_set(ROAR_ERROR_NOTSUP); |
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| 290 | return -1; |
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| 291 | } |
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| 292 | |
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| 293 | if ( port->mode & ROAR_SERVICE_GPIO_FINPUT ) { |
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| 294 | val = piface__read_input(); |
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| 295 | } else { |
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| 296 | val = piface__read_output(); |
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| 297 | } |
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| 298 | |
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| 299 | return __portval_to_bool(port, val); |
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| 300 | } |
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| 301 | |
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| 302 | static double __get_float(int id) { |
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| 303 | return __get_int(id); |
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| 304 | } |
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| 305 | |
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| 306 | // set value of output (as int or float). |
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| 307 | static int __set_int(int id, int val) { |
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| 308 | const struct roar_service_gpio_port * port; |
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| 309 | unsigned char buffer; |
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| 310 | int bit; |
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| 311 | |
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| 312 | if ( !state->inited ) { |
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| 313 | roar_err_set(ROAR_ERROR_BADSTATE); |
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| 314 | return -1; |
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| 315 | } |
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| 316 | |
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| 317 | if ( id < 0 || id >= NUM_PORTS ) { |
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| 318 | roar_err_set(ROAR_ERROR_RANGE); |
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| 319 | return -1; |
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| 320 | } |
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| 321 | |
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| 322 | port = &(state->ports[id]); |
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| 323 | |
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[5904] | 324 | if ( !(port->mode & ROAR_SERVICE_GPIO_FOUTPUT) ) { |
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[5902] | 325 | roar_err_set(ROAR_ERROR_NOTSUP); |
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| 326 | return -1; |
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| 327 | } |
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| 328 | |
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[5904] | 329 | if ( val < port->irange_min || val > port->irange_max ) { |
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| 330 | roar_err_set(ROAR_ERROR_RANGE); |
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| 331 | return -1; |
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| 332 | } |
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[5902] | 333 | |
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[5904] | 334 | switch (port->type) { |
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| 335 | case ROAR_SERVICE_GPIO_TBOOL: |
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| 336 | bit = 1 << (id & 0x07); |
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| 337 | |
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| 338 | buffer = state->buffer_output; |
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| 339 | buffer |= bit; |
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[5902] | 340 | |
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[5904] | 341 | if ( !val ) |
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| 342 | buffer -= bit; |
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| 343 | |
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| 344 | piface__write_output(buffer); |
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[5902] | 345 | |
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[5904] | 346 | return 0; |
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| 347 | break; |
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| 348 | case ROAR_SERVICE_GPIO_TINT: |
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| 349 | piface__write_output(__render_bar(val)); |
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| 350 | return 0; |
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| 351 | break; |
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| 352 | default: |
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| 353 | roar_err_set(ROAR_ERROR_NOTSUP); |
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| 354 | return -1; |
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| 355 | break; |
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| 356 | } |
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[5902] | 357 | } |
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| 358 | |
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| 359 | static int __set_float(int id, double val) { |
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| 360 | return __set_int(id, val); |
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| 361 | } |
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| 362 | |
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| 363 | static struct roar_service_gpio api = { |
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| 364 | .list = __list, |
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| 365 | .num = __num, |
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| 366 | .get = __get, |
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| 367 | .setup = __setup, |
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| 368 | .get_int = __get_int, |
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| 369 | .get_float = __get_float, |
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| 370 | .set_int = __set_int, |
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| 371 | .set_float = __set_float, |
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| 372 | .convert_int = NULL, |
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| 373 | .convert_float = NULL |
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| 374 | }; |
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| 375 | |
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| 376 | ROAR_DL_PLUGIN_REG_SERVICES_GET_API(get_api, api) |
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| 377 | |
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| 378 | static const struct roar_dl_service service[1] = { |
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| 379 | { |
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| 380 | .appname = NULL, |
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| 381 | .appabi = NULL, |
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| 382 | .servicename = ROAR_SERVICE_GPIO_NAME, |
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| 383 | .serviceabi = ROAR_SERVICE_GPIO_ABI, |
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| 384 | .description = "Interface to PiFace", |
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| 385 | .flags = ROAR_DL_SERVICE_FLAGS_NONE, |
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| 386 | .userdata = NULL, |
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| 387 | .get_api = get_api |
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| 388 | } |
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| 389 | }; |
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| 390 | |
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| 391 | ROAR_DL_PLUGIN_REG_SERVICES(service); |
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| 392 | |
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| 393 | ROAR_DL_PLUGIN_START(piface) { |
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| 394 | ROAR_DL_PLUGIN_META_PRODUCT_NIV("piface", ROAR_VID_ROARAUDIO, ROAR_VNAME_ROARAUDIO); |
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| 395 | ROAR_DL_PLUGIN_META_VERSION(ROAR_VERSION_STRING); |
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| 396 | ROAR_DL_PLUGIN_META_LICENSE_TAG(GPLv3_0); |
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| 397 | ROAR_DL_PLUGIN_META_CONTACT_FLNE("Philipp", "Schafft", "ph3-der-loewe", "lion@lion.leolix.org"); |
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| 398 | ROAR_DL_PLUGIN_META_DESC("This plugin provides a simple interface to the PiFace board."); |
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| 399 | ROAR_DL_PLUGIN_REG_FNFUNC(ROAR_DL_FN_SERVICE); |
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| 400 | ROAR_DL_PLUGIN_REG_GLOBAL_DATA(state, state_init); |
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| 401 | } ROAR_DL_PLUGIN_END |
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| 402 | |
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| 403 | #endif |
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| 404 | |
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| 405 | //ll |
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