adafruit-mirror/adafruit-beaglebone-io-python
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
adafruit-beaglebone-io-python/source/common.c
Drew Fustini 9e44c5dca0 add alternate name for pin P8_19 (issue #239) 
Allow P8_19 to be referenced as GPIO0_22.

Add temporary debugging output to test.
2018-03-23 04:47:53 +00:00

790 lines
23 KiB
C
Raw Permalink Blame History

/*
Copyright (c) 2013 Adafruit
Original RPi.GPIO Author Ben Croston
Modified for BBIO Author Justin Cooper
Modified for 4.1+ kernels by Grizmio
Unified for 3.8 and 4.1+ kernels by Peter Lawler <relwalretep@gmail.com>
This file incorporates work covered by the following copyright and
permission notice, all modified code adopts the original license:
Copyright (c) 2013 Ben Croston
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#ifndef NO_PYTHON
# include "Python.h"
#endif // !NO_PYTHON
#include <dirent.h>
#include <errno.h>
#include <glob.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include "common.h"
#include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,1,0)
# ifndef BBBVERSION41
# define BBBVERSION41
# endif
#endif
int gpio_mode;
int gpio_direction[120];
char ctrl_dir[CTRL_DIR_MAX];
char ocp_dir[OCP_DIR_MAX];
int setup_error = 0;
int module_setup = 0;
typedef struct pins_t {
const char *name;
const char *key;
int gpio;
int pwm_mux_mode;
int ain;
} pins_t;
//Table generated based on https://raw.github.com/jadonk/bonescript/master/node_modules/bonescript/bone.js
pins_t table[] = {
{ "USR0", "USR0", 53, -1, -1},
{ "USR1", "USR1", 54, -1, -1},
{ "USR2", "USR2", 55, -1, -1},
{ "USR3", "USR3", 56, -1, -1},
{ "DGND", "P8_1", 0, -1, -1},
{ "DGND", "P8_2", 0, -1, -1},
{ "GPIO1_6", "P8_3", 38, -1, -1},
{ "GPIO1_7", "P8_4", 39, -1, -1},
{ "GPIO1_2", "P8_5", 34, -1, -1},
{ "GPIO1_3", "P8_6", 35, -1, -1},
{ "TIMER4", "P8_7", 66, -1, -1},
{ "TIMER7", "P8_8", 67, -1, -1},
{ "TIMER5", "P8_9", 69, -1, -1},
{ "TIMER6", "P8_10", 68, -1, -1},
{ "GPIO1_13", "P8_11", 45, -1, -1},
{ "GPIO1_12", "P8_12", 44, -1, -1},
{ "EHRPWM2B", "P8_13", 23, 4, -1},
{ "GPIO0_26", "P8_14", 26, -1, -1},
{ "GPIO1_15", "P8_15", 47, -1, -1},
{ "GPIO1_14", "P8_16", 46, -1, -1},
{ "GPIO0_27", "P8_17", 27, -1, -1},
{ "GPIO2_1", "P8_18", 65, -1, -1},
{ "EHRPWM2A", "P8_19", 22, 4, -1},
{ "GPIO0_22", "P8_19", 22, 4, -1},
{ "GPIO1_31", "P8_20", 63, -1, -1},
{ "GPIO1_30", "P8_21", 62, -1, -1},
{ "GPIO1_5", "P8_22", 37, -1, -1},
{ "GPIO1_4", "P8_23", 36, -1, -1},
{ "GPIO1_1", "P8_24", 33, -1, -1},
{ "GPIO1_0", "P8_25", 32, -1, -1},
{ "GPIO1_29", "P8_26", 61, -1, -1},
{ "GPIO2_22", "P8_27", 86, -1, -1},
{ "GPIO2_24", "P8_28", 88, -1, -1},
{ "GPIO2_23", "P8_29", 87, -1, -1},
{ "GPIO2_25", "P8_30", 89, -1, -1},
{ "UART5_CTSN", "P8_31", 10, -1, -1},
{ "UART5_RTSN", "P8_32", 11, -1, -1},
{ "UART4_RTSN", "P8_33", 9, -1, -1},
{ "UART3_RTSN", "P8_34", 81, 2, -1},
{ "UART4_CTSN", "P8_35", 8, -1, -1},
{ "UART3_CTSN", "P8_36", 80, 2, -1},
{ "UART5_TXD", "P8_37", 78, -1, -1},
{ "UART5_RXD", "P8_38", 79, -1, -1},
{ "GPIO2_12", "P8_39", 76, -1, -1},
{ "GPIO2_13", "P8_40", 77, -1, -1},
{ "GPIO2_10", "P8_41", 74, -1, -1},
{ "GPIO2_11", "P8_42", 75, -1, -1},
{ "GPIO2_8", "P8_43", 72, -1, -1},
{ "GPIO2_9", "P8_44", 73, -1, -1},
{ "GPIO2_6", "P8_45", 70, 3, -1},
{ "GPIO2_7", "P8_46", 71, 3, -1},
{ "DGND", "P9_1", 0, -1, -1},
{ "DGND", "P9_2", 0, -1, -1},
{ "VDD_3V3", "P9_3", 0, -1, -1},
{ "VDD_3V3", "P9_4", 0, -1, -1},
{ "VDD_5V", "P9_5", 0, -1, -1},
{ "VDD_5V", "P9_6", 0, -1, -1},
{ "SYS_5V", "P9_7", 0, -1, -1},
{ "SYS_5V", "P9_8", 0, -1, -1},
{ "PWR_BUT", "P9_9", 0, -1, -1},
{ "SYS_RESETn", "P9_10", 0, -1, -1},
{ "UART4_RXD", "P9_11", 30, -1, -1},
{ "GPIO1_28", "P9_12", 60, -1, -1},
{ "UART4_TXD", "P9_13", 31, -1, -1},
{ "EHRPWM1A", "P9_14", 50, 6, -1},
{ "GPIO1_16", "P9_15", 48, -1, -1},
{ "EHRPWM1B", "P9_16", 51, 6, -1},
{ "I2C1_SCL", "P9_17", 5, -1, -1},
{ "I2C1_SDA", "P9_18", 4, -1, -1},
{ "I2C2_SCL", "P9_19", 13, -1, -1},
{ "I2C2_SDA", "P9_20", 12, -1, -1},
{ "UART2_TXD", "P9_21", 3, 3, -1},
{ "UART2_RXD", "P9_22", 2, 3, -1},
{ "GPIO1_17", "P9_23", 49, -1, -1},
{ "UART1_TXD", "P9_24", 15, -1, -1},
{ "GPIO3_21", "P9_25", 117, -1, -1},
{ "UART1_RXD", "P9_26", 14, -1, -1},
{ "GPIO3_19", "P9_27", 115, -1, -1},
{ "SPI1_CS0", "P9_28", 113, 4, -1},
{ "SPI1_D0", "P9_29", 111, 1, -1},
{ "SPI1_D1", "P9_30", 112, -1, -1},
{ "SPI1_SCLK", "P9_31", 110, 1, -1},
{ "VDD_ADC", "P9_32", 0, -1, -1},
{ "AIN4", "P9_33", 0, -1, 4},
{ "GNDA_ADC", "P9_34", 0, -1, -1},
{ "AIN6", "P9_35", 0, -1, 6},
{ "AIN5", "P9_36", 0, -1, 5},
{ "AIN2", "P9_37", 0, -1, 2},
{ "AIN3", "P9_38", 0, -1, 3},
{ "AIN0", "P9_39", 0, -1, 0},
{ "AIN1", "P9_40", 0, -1, 1},
{ "CLKOUT2", "P9_41", 20, -1, -1},
{ "GPIO0_7", "P9_42", 7, 0, -1},
{ "DGND", "P9_43", 0, -1, -1},
{ "DGND", "P9_44", 0, -1, -1},
{ "DGND", "P9_45", 0, -1, -1},
{ "DGND", "P9_46", 0, -1, -1},
// These are for the Blue
{ "GP0_3", "GP0_3", 57, -1, -1},
{ "GP0_4", "GP0_4", 49, -1, -1},
{ "GP0_5", "GP0_5", 116, -1, -1},
{ "GP0_6", "GP0_6", 113, -1, -1},
{ "GP1_3", "GP1_3", 98, -1, -1},
{ "GP1_4", "GP1_4", 97, -1, -1},
{ "RED_LED", "RED", 66, -1, -1}, // LEDs
{ "GREEN_LED", "GREEN", 67, -1, -1},
{ "BAT25", "BAT25", 27, -1, -1},
{ "BAT50", "BAT50", 11, -1, -1},
{ "BAT75", "BAT75", 61, -1, -1},
{ "BAT100", "BAT100", 10000, -1, -1}, // Placeholder
{ "WIFI", "WIFI", 10001, -1, -1}, // Placeholder
{ "PAUSE", "P8_9", 69, 1, -1},
{ "MODE", "P8_10", 68, 1, -1},
// These are for the PocketBeagle
{ "VIN_AC", "P1_1", 0, -1, -1},
{ "GPIO2_23", "P1_2", 87, -1, -1},
{ "USB1_VBUS_OUT", "P1_3", 0, -1, -1},
{ "GPIO2_25", "P1_4", 89, -1, -1},
{ "USB1_VBUS_IN", "P1_5", 0, -1, -1},
{ "SPI0_CS0", "P1_6", 5, -1, -1},
{ "VIN-USB", "P1_7", 0, -1, -1},
{ "SPI0_SCLK", "P1_8", 2, 3, -1},
{ "USB1-DN", "P1_9", 0, -1, -1},
{ "SPI0_D0", "P1_10", 3, 3, -1},
{ "USB1-DP", "P1_11", 0, -1, -1},
{ "SPI0_D1", "P1_12", 4, -1, -1},
{ "USB1-ID", "P1_13", 0, -1, -1},
{ "VOUT-3.3V", "P1_14", 0, -1, -1},
{ "GND", "P1_15", 0, -1, -1},
{ "GND", "P1_16", 0, -1, -1},
{ "VREFN", "P1_17", 0, -1, -1},
{ "VREFP", "P1_18", 0, -1, -1},
{ "AIN0", "P1_19", 0, -1, 0},
{ "GPIO0_20", "P1_20", 20, -1, -1},
{ "AIN1", "P1_21", 0, -1, 1},
{ "GND", "P1_22", 0, -1, -1},
{ "AIN2", "P1_23", 0, -1, 2},
{ "VOUT-5V", "P1_24", 0, -1, -1},
{ "AIN3", "P1_25", 0, -1, 3},
{ "I2C2_SDA", "P1_26", 12, -1, -1},
{ "AIN4", "P1_27", 0, -1, 4},
{ "I2C2_SCL", "P1_28", 13, -1, -1},
{ "GPIO3_21", "P1_29", 117, -1, -1},
{ "UART0_TXD", "P1_30", 43, -1, -1},
{ "GPIO3_18", "P1_31", 114, -1, -1},
{ "UART0_RXD", "P1_32", 42, -1, -1},
{ "GPIO3_15", "P1_33", 111, 1, -1},
{ "GPIO0_26", "P1_34", 26, -1, -1},
{ "GPIO2_24", "P1_35", 88, -1, -1},
{ "EHRPWM0A", "P1_36", 110, 1, -1},
{ "EHRPWM1A", "P2_1", 50, 6, -1},
{ "GPIO1_27", "P2_2", 59, -1, -1},
{ "GPIO0_23", "P2_3", 23, 4, -1},
{ "GPIO1_26", "P2_4", 58, -1, -1},
{ "UART4_RXD", "P2_5", 30, -1, -1},
{ "GPIO1_25", "P2_6", 57, -1, -1},
{ "UART4_TXD", "P2_7", 31, -1, -1},
{ "GPIO1_28", "P2_8", 60, -1, -1},
{ "I2C1_SCL", "P2_9", 15, -1, -1},
{ "GPIO1_20", "P2_10", 52, -1, -1},
{ "I2C1_SDA", "P2_11", 14, -1, -1},
{ "POWER_BUTTON", "P2_12", 0, -1, -1},
{ "VOUT-5V", "P2_13", 0, -1, -1},
{ "BAT-VIN", "P2_14", 0, -1, -1},
{ "GND", "P2_15", 0, -1, -1},
{ "BAT-TEMP", "P2_16", 0, -1, -1},
{ "GPIO2_1", "P2_17", 65, -1, -1},
{ "GPIO1_15", "P2_18", 47, -1, -1},
{ "GPIO0_27", "P2_19", 27, -1, -1},
{ "GPIO2_0", "P2_20", 64, -1, -1},
{ "GND", "P2_21", 0, -1, -1},
{ "GPIO1_14", "P2_22", 46, -1, -1},
{ "VOUT-3.3V", "P2_23", 0, -1, -1},
{ "GPIO1_12", "P2_24", 44, -1, -1},
{ "SPI1_CS0", "P2_25", 41, -1, -1},
{ "RESET#", "P2_26", 0, -1, -1},
{ "SPI1_D0", "P2_27", 40, -1, -1},
{ "GPIO3_20", "P2_28", 116, -1, -1},
{ "SPI1_SCLK", "P2_29", 7, -1, -1},
{ "GPIO3_17", "P2_30", 113, -1, -1},
{ "SPI1_CS1", "P2_31", 19, -1, -1},
{ "GPIO3_16", "P2_32", 112, -1, -1},
{ "GPIO1_13", "P2_33", 45, -1, -1},
{ "GPIO3_19", "P2_34", 115, -1, -1},
{ "GPIO2_22", "P2_35", 86, -1, -1},
{ "AIN7", "P2_36", 0, -1, 7},
{ NULL, NULL, 0, 0, 0 }
};
uart_t uart_table[] = {
{ "UART1", "/dev/ttyO1", "ADAFRUIT-UART1", "P9_26", "P9_24"},
{ "UART2", "/dev/ttyO2", "ADAFRUIT-UART2", "P9_22", "P9_21"},
{ "UART3", "/dev/ttyO3", "ADAFRUIT-UART3", "P9_42", ""},
{ "UART4", "/dev/ttyO4", "ADAFRUIT-UART4", "P9_11", "P9_13"},
{ "UART5", "/dev/ttyO5", "ADAFRUIT-UART5", "P8_38", "P8_37"},
{ NULL, NULL, 0, 0, 0 }
};
// Copied from https://github.com/jadonk/bonescript/blob/master/src/bone.js
// See am335x technical manual, p. 183, for more info:
// http://www.ti.com/lit/ug/spruh73n/spruh73n.pdf
pwm_t pwm_table[] = {
{ "ehrpwm2", 6, 1, 4, "ehrpwm.2:1", "EHRPWM2B", "48304000", "48304200", "P8_13"},
{ "ehrpwm2", 5, 0, 4, "ehrpwm.2:0", "EHRPWM2A", "48304000", "48304200", "P8_19"},
{ "ehrpwm1", 4, 1, 2, "ehrpwm.1:1", "EHRPWM1B", "48302000", "48302200", "P8_34"},
{ "ehrpwm1", 3, 0, 2, "ehrpwm.1:0", "EHRPWM1A", "48302000", "48302200", "P8_36"},
{ "ehrpwm2", 5, 0, 3, "ehrpwm.2:0", "EHRPWM2A", "48304000", "48304200", "P8_45"},
{ "ehrpwm2", 6, 1, 3, "ehrpwm.2:1", "EHRPWM2B", "48304000", "48304200", "P8_46"},
{ "ehrpwm1", 3, 0, 6, "ehrpwm.1:0", "EHRPWM1A", "48302000", "48302200", "P9_14"},
{ "ehrpwm1", 4, 1, 6, "ehrpwm.1:1", "EHRPWM1B", "48302000", "48302200", "P9_16"},
{ "ehrpwm0", 1, 1, 3, "ehrpwm.0:1", "EHRPWM0B", "48300000", "48300200", "P9_21"},
{ "ehrpwm0", 0, 0, 3, "ehrpwm.0:0", "EHRPWM0A", "48300000", "48300200", "P9_22"},
{ "ecap2", 7, 0, 4, "ecap.2", "ECAPPWM2", "48304000", "48304100", "P9_28"},
{ "ehrpwm0", 1, 1, 1, "ehrpwm.0:1", "EHRPWM0B", "48300000", "48300200", "P9_29"},
{ "ehrpwm0", 0, 0, 1, "ehrpwm.0:0", "EHRPWM0A", "48300000", "48300200", "P9_31"},
{ "ecap0", 2, 0, 0, "ecap.0", "ECAPPWM0", "48300000", "48300100", "P9_42"},
{ "ehrpwm0", 0, 0, 1, "ehrpwm.0:0", "EHRPWM0A", "48300000", "48300200", "P1_8"},
{ "ehrpwm0", 0, 0, 1, "ehrpwm.0:0", "EHRPWM0A", "48300000", "48300200", "P1_36"},
{ "ehrpwm0", 1, 1, 1, "ehrpwm.0:1", "EHRPWM0B", "48300000", "48300200", "P1_10"},
{ "ehrpwm0", 1, 1, 1, "ehrpwm.0:1", "EHRPWM0B", "48300000", "48300200", "P1_33"},
{ "ehrpwm1", 3, 0, 6, "ehrpwm.1:0", "EHRPWM1A", "48302000", "48302200", "P2_1"},
{ "ehrpwm2", 6, 1, 3, "ehrpwm.2:1", "EHRPWM2B", "48304000", "48304200", "P2_3"},
{ NULL, 0, 0, 0, NULL, NULL, NULL, NULL, NULL }
};
int lookup_gpio_by_key(const char *key)
{
pins_t *p;
fprintf(stderr, "DEBUG: lookup_gpio_by_key(): key=%s\n", key);
for (p = table; p->key != NULL; ++p) {
if (strcmp(p->key, key) == 0) {
return p->gpio;
}
}
fprintf(stderr, "DEBUG: lookup_gpio_by_key(): return 0\n");
return 0;
}
int lookup_gpio_by_name(const char *name)
{
pins_t *p;
fprintf(stderr, "DEBUG: lookup_gpio_by_name(): name=%s\n", name);
for (p = table; p->name != NULL; ++p) {
if (strcmp(p->name, name) == 0) {
return p->gpio;
}
}
fprintf(stderr, "DEBUG: lookup_gpio_by_name(): return 0\n");
return 0;
}
int lookup_ain_by_key(const char *key)
{
pins_t *p;
for (p = table; p->key != NULL; ++p) {
if (strcmp(p->key, key) == 0) {
if (p->ain == -1) {
return -1;
} else {
return p->ain;
}
}
}
return -1;
}
int lookup_ain_by_name(const char *name)
{
pins_t *p;
for (p = table; p->name != NULL; ++p) {
if (strcmp(p->name, name) == 0) {
if (p->ain == -1) {
return -1;
} else {
return p->ain;
}
}
}
return -1;
}
BBIO_err lookup_uart_by_name(const char *input_name, char *dt)
{
uart_t *p;
for (p = uart_table; p->name != NULL; ++p) {
if (strcmp(p->name, input_name) == 0) {
strncpy(dt, p->dt, FILENAME_BUFFER_SIZE);
dt[FILENAME_BUFFER_SIZE - 1] = '\0';
return BBIO_OK;
}
}
return BBIO_INVARG;
}
BBIO_err copy_pwm_key_by_key(const char *input_key, char *key)
{
pins_t *p;
for (p = table; p->key != NULL; ++p) {
if (strcmp(p->key, input_key) == 0) {
//validate it's a valid pwm pin
if (p->pwm_mux_mode == -1)
return BBIO_INVARG;
strncpy(key, p->key, 7);
key[7] = '\0';
return BBIO_OK;
}
}
return BBIO_INVARG;
}
BBIO_err get_pwm_key_by_name(const char *name, char *key)
{
pins_t *p;
for (p = table; p->name != NULL; ++p) {
if (strcmp(p->name, name) == 0) {
//validate it's a valid pwm pin
if (p->pwm_mux_mode == -1)
return BBIO_INVARG;
strncpy(key, p->key, 7);
key[7] = '\0';
return BBIO_OK;
}
}
return BBIO_INVARG;
}
BBIO_err get_gpio_number(const char *key, unsigned int *gpio)
{
fprintf(stderr, "DEBUG: get_gpio_number(): key=%s\n", key);
*gpio = lookup_gpio_by_key(key);
if (!*gpio) {
*gpio = lookup_gpio_by_name(key);
}
if (!*gpio) {
fprintf(stderr, "DEBUG: get_gpio_number(): return BBIO_INVARG\n");
return BBIO_INVARG;
}
fprintf(stderr, "DEBUG: get_gpio_number(): return BBIO_OK\n");
return BBIO_OK;
}
BBIO_err get_pwm_by_key(const char *key, pwm_t **pwm)
{
pwm_t *p;
// Loop through the table
for (p = pwm_table; p->key != NULL; ++p) {
if (strcmp(p->key, key) == 0) {
// Return the pwm_t struct
*pwm = p;
return BBIO_OK;
}
}
return BBIO_INVARG;
}
BBIO_err get_pwm_key(const char *input, char *key)
{
BBIO_err err = copy_pwm_key_by_key(input, key);
if (err == BBIO_OK) {
return err;
}
err = get_pwm_key_by_name(input, key);
if (err == BBIO_OK) {
return err;
}
return BBIO_INVARG;
}
// TODO: fix warning
// source/common.c:344:14: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
BBIO_err get_adc_ain(const char *key, int *ain)
{
*ain = lookup_ain_by_key(key);
if (*ain == -1) {
*ain = lookup_ain_by_name(key);
if (*ain == -1) {
return BBIO_INVARG;
}
}
return BBIO_OK;
}
BBIO_err get_uart_device_tree_name(const char *name, char *dt)
{
BBIO_err err;
err = lookup_uart_by_name(name, dt);
if (err != BBIO_OK) {
return err;
}
return BBIO_OK;
}
BBIO_err build_path(const char *partial_path, const char *prefix, char *full_path, size_t full_path_len)
{
glob_t results;
size_t len = strlen(partial_path) + strlen(prefix) + 5;
char *pattern = malloc(len);
snprintf(pattern, len, "%s/%s*", partial_path, prefix);
/* int glob(const char *pattern, int flags,
int (*errfunc) (const char *epath, int eerrno),
glob_t *pglob); */
int err = glob(pattern, 0, NULL, &results);
free(pattern);
if (err != BBIO_OK) {
globfree(&results);
if (err == GLOB_NOSPACE)
return BBIO_MEM;
else
return BBIO_GEN;
}
// We will return the first match
strncpy(full_path, results.gl_pathv[0], full_path_len);
// Free memory
globfree(&results);
return BBIO_OK;
}
int get_spi_bus_path_number(unsigned int spi)
{
char path[MAX_PATH];
#ifdef BBBVERSION41
strncpy(ocp_dir, "/sys/devices/platform/ocp", sizeof(ocp_dir));
#else
build_path("/sys/devices", "ocp", ocp_dir, sizeof(ocp_dir));
#endif
if (spi == 0) {
snprintf(path, sizeof(path), "%s/48030000.spi/spi_master/spi1", ocp_dir);
} else {
snprintf(path, sizeof(path), "%s/481a0000.spi/spi_master/spi1", ocp_dir);
}
DIR* dir = opendir(path);
if (dir) {
closedir(dir);
//device is using /dev/spidev1.x
return 1;
} else if (ENOENT == errno) {
//device is using /dev/spidev2.x
return 2;
} else {
return -1;
}
}
/*
Refer to: http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#U-Boot_Overlays
Robert C. Nelson maintains the BeagleBoard.org Debian images and
suggested adding this check to see if u-boot overlays are enabled.
If u-boot overlays are enabled, then device tree overlays should not
be loaded with the cape manager by writing to the slots file. There
is currently a kernel bug that causes the write to hang.
*/
int uboot_overlay_enabled(void) {
const char *cmd = "/bin/grep -c bone_capemgr.uboot_capemgr_enabled=1 /proc/cmdline";
char uboot_overlay;
FILE *file = NULL;
file = popen(cmd, "r");
if (file == NULL) {
fprintf(stderr, "error: uboot_overlay_enabled() failed to run cmd=%s\n", cmd);
syslog(LOG_ERR, "Adafruit_BBIO: error: uboot_overlay_enabled() failed to run cmd=%s\n", cmd);
return -1;
}
uboot_overlay = fgetc(file);
pclose(file);
if(uboot_overlay == '1') {
syslog(LOG_DEBUG, "Adafruit_BBIO: uboot_overlay_enabled() is true\n");
return 1;
} else {
syslog(LOG_DEBUG, "Adafruit_BBIO: uboot_overlay_enabled() is false\n");
return 0;
}
}
/*
PocketBeagle has everything built-in to the main dtb
*/
int pocketbeagle(void) {
const char *cmd = "/bin/grep -c 'TI AM335x PocketBeagle' /proc/device-tree/model";
char pocketbeagle;
FILE *file = NULL;
file = popen(cmd, "r");
if (file == NULL) {
fprintf(stderr, "error: pocketbeagle() failed to run cmd=%s\n", cmd);
syslog(LOG_ERR, "Adafruit_BBIO: error: pocketbeagle() failed to run cmd=%s\n", cmd);
return -1;
}
pocketbeagle = fgetc(file);
pclose(file);
if(pocketbeagle == '1') {
return 1;
} else {
return 0;
}
}
/*
Check if board is a BeagleBone Blue
Refer to GitHub issue for more information:
https://github.com/adafruit/adafruit-beaglebone-io-python/issues/178
*/
int beaglebone_blue(void) {
const char *cmd = "/bin/grep -c 'TI AM335x BeagleBone Blue' /proc/device-tree/model";
// cache the value to avoid poor performance
// in functions that are called frequently like
// gpio_set_value() in source/event_gpio.c
static int initialized = 0;
static int retval = 0;
FILE *file = NULL;
//fprintf(stderr, "beaglebone_blue(): initialized=[%d] retval=[%d]\n", initialized, retval);
if(!initialized) {
initialized = 1;
//fprintf(stderr, "beaglebone_blue(): not initialized\n");
file = popen(cmd, "r");
if (file == NULL) {
fprintf(stderr, "Adafruit_BBIO: error in beaglebone_blue(): failed to run cmd=%s\n", cmd);
syslog(LOG_ERR, "Adafruit_BBIO: error in beaglebone_blue(): failed to run cmd=%s\n", cmd);
return -1;
}
if( fgetc(file) == '1' ) {
retval = 1;
}
pclose(file);
}
return retval;
}
BBIO_err load_device_tree(const char *name)
{
char line[256];
FILE *file = NULL;
#ifdef BBBVERSION41
char slots[41];
snprintf(ctrl_dir, sizeof(ctrl_dir), "/sys/devices/platform/bone_capemgr");
#else
char slots[40];
build_path("/sys/devices", "bone_capemgr", ctrl_dir, sizeof(ctrl_dir));
#endif
/* Check if the Linux kernel booted with u-boot overlays enabled.
If enabled, do not load overlays via slots file as the write
will hang due to kernel bug in cape manager driver. Just return
BBIO_OK in order to avoid cape manager bug. */
if(uboot_overlay_enabled()) {
return BBIO_OK;
}
if(pocketbeagle()) {
return BBIO_OK;
}
snprintf(slots, sizeof(slots), "%s/slots", ctrl_dir);
file = fopen(slots, "r+");
if (!file) {
#ifndef NO_PYTHON
PyErr_SetFromErrnoWithFilename(PyExc_IOError, slots);
#endif // !NO_PYTHON
return BBIO_CAPE;
}
while (fgets(line, sizeof(line), file)) {
//the device is already loaded, return 1
if (strstr(line, name)) {
fclose(file);
return BBIO_OK;
}
}
//if the device isn't already loaded, load it, and return
fprintf(file, "%s", name);
fclose(file);
//0.2 second delay
nanosleep((struct timespec[]){{0, 200000000}}, NULL);
return BBIO_OK;
}
// Find whether a device tree is loaded.
// Returns 1 if so, 0 if not, and <0 if error
int device_tree_loaded(const char *name)
{
FILE *file = NULL;
#ifdef BBBVERSION41
char slots[41];
snprintf(ctrl_dir, sizeof(ctrl_dir), "/sys/devices/platform/bone_capemgr");
#else
char slots[40];
build_path("/sys/devices", "bone_capemgr", ctrl_dir, sizeof(ctrl_dir));
#endif
char line[256];
/* Check if the Linux kernel booted with u-boot overlays enabled.
If enabled, do not load overlays via slots file as the write
will hang due to kernel bug in cape manager driver. Return 1
to fake the device tree is loaded to avoid cape manager bug */
if(uboot_overlay_enabled()) {
return 1;
}
if(pocketbeagle()) {
return BBIO_OK;
}
snprintf(slots, sizeof(slots), "%s/slots", ctrl_dir);
file = fopen(slots, "r+");
if (!file) {
#ifndef NO_PYTHON
PyErr_SetFromErrnoWithFilename(PyExc_IOError, slots);
#endif // !NO_PYTHON
return -1;
}
while (fgets(line, sizeof(line), file)) {
//the device is loaded, close file and return true
if (strstr(line, name)) {
fclose(file);
return 1;
}
}
//not loaded, close file
fclose(file);
return 0;
}
BBIO_err unload_device_tree(const char *name)
{
FILE *file = NULL;
#ifdef BBBVERSION41
char slots[41];
snprintf(ctrl_dir, sizeof(ctrl_dir), "/sys/devices/platform/bone_capemgr");
#else
char slots[40];
build_path("/sys/devices", "bone_capemgr", ctrl_dir, sizeof(ctrl_dir));
#endif
char line[256];
char *slot_line;
snprintf(slots, sizeof(slots), "%s/slots", ctrl_dir);
file = fopen(slots, "r+");
if (!file) {
#ifndef NO_PYTHON
PyErr_SetFromErrnoWithFilename(PyExc_IOError, slots);
#endif // !NO_PYTHON
return BBIO_SYSFS;
}
while (fgets(line, sizeof(line), file)) {
//the device is loaded, let's unload it
if (strstr(line, name)) {
slot_line = strtok(line, ":");
//remove leading spaces
while(*slot_line == ' ')
slot_line++;
fprintf(file, "-%s", slot_line);
fclose(file);
return BBIO_OK;
}
}
//not loaded, close file
fclose(file);
return BBIO_OK;
}
void initlog(int level, const char* ident, int option)
{
static int initialized = 0;
if (initialized) return;
setlogmask(LOG_UPTO(level));
if (option == -1) {
option = BBIO_LOG_OPTION;
}
openlog(ident, option, LOG_LOCAL1);
syslog(LOG_NOTICE, "Adafruit_BBIO: version %s initialized", "<unknown>");
initialized = 1;
}
Reference in a new issue View git blame Copy permalink