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rpi: take care of gpiochip base

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The gpio pins numbers aren't just matching the physical pin numbers...
on some distros like raspbian, with a kernel explicitly setting the
base to 0, it works, but for kernels using the first free slot it
doesn't (see gpiochip_find_base() in kernel's gpiolib.c).

To get the proper gpio pin value, we thus need to find the base for
the corresponding gpiochip. For the raspberry pi, we search for the
chip with a label containing 'bcm2835'.

Signed-off-by: Cédric Bosdonnat <cbosdonnat@suse.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Cédric Bosdonnat
2017-02-23 15:20:48 +01:00
committed by Brendan Le Foll
parent c69b6312fa
commit 875289ab94
1 changed files with 59 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

90
src/arm/raspberry_pi.c
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@@ -25,6 +25,7 @@
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <sys/mman.h>
#include <mraa/common.h>
@@ -213,6 +214,8 @@ mraa_board_t*
mraa_raspberry_pi()
{
mraa_board_t* b = (mraa_board_t*) calloc(1, sizeof(mraa_board_t));
int pin_base = 0;
if (b == NULL) {
return NULL;
}
@@ -353,6 +356,31 @@ mraa_raspberry_pi()
return NULL;
}
// Detect the base of the gpiochip, raspbian hardcodes it to 0 in the kernel
// while upstream kernel does not.
DIR* gpio_dir = opendir("/sys/class/gpio");
if (gpio_dir == NULL) {
free(b->adv_func);
free(b);
return NULL;
}
struct dirent* child;
while ((child = readdir(gpio_dir)) != NULL) {
if (strstr(child->d_name, "gpiochip")) {
char chip_path[MAX_SIZE];
sprintf(chip_path, "/sys/class/gpio/%s/label", child->d_name);
if (mraa_file_contains(chip_path, "bcm2835")) {
if (mraa_atoi(child->d_name + 8, &pin_base) != MRAA_SUCCESS) {
free(b->adv_func);
free(b);
return NULL;
}
break;
}
}
}
b->adv_func->spi_init_pre = &mraa_raspberry_pi_spi_init_pre;
b->adv_func->i2c_init_pre = &mraa_raspberry_pi_i2c_init_pre;
b->adv_func->gpio_mmap_setup = &mraa_raspberry_pi_mmap_setup;
@@ -368,7 +396,7 @@ mraa_raspberry_pi()
strncpy(b->pins[3].name, "SDA0", MRAA_PIN_NAME_SIZE);
b->pins[3].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 1, 0, 0 };
b->pins[3].gpio.pinmap = 2;
b->pins[3].gpio.pinmap = pin_base + 2;
b->pins[3].gpio.mux_total = 0;
b->pins[3].i2c.pinmap = 0;
b->pins[3].i2c.mux_total = 0;
@@ -378,7 +406,7 @@ mraa_raspberry_pi()
strncpy(b->pins[5].name, "SCL0", MRAA_PIN_NAME_SIZE);
b->pins[5].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 1, 0, 0 };
b->pins[5].gpio.pinmap = 3;
b->pins[5].gpio.pinmap = pin_base + 3;
b->pins[5].gpio.mux_total = 0;
b->pins[5].i2c.pinmap = 0;
b->pins[5].i2c.mux_total = 0;
@@ -388,12 +416,12 @@ mraa_raspberry_pi()
strncpy(b->pins[7].name, "GPIO4", MRAA_PIN_NAME_SIZE);
b->pins[7].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[7].gpio.pinmap = 4;
b->pins[7].gpio.pinmap = pin_base + 4;
b->pins[7].gpio.mux_total = 0;
strncpy(b->pins[8].name, "UART_TX", MRAA_PIN_NAME_SIZE);
b->pins[8].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 1 };
b->pins[8].gpio.pinmap = 14;
b->pins[8].gpio.pinmap = pin_base + 14;
b->pins[8].gpio.mux_total = 0;
b->pins[8].uart.parent_id = 0;
b->pins[8].uart.mux_total = 0;
@@ -403,27 +431,27 @@ mraa_raspberry_pi()
strncpy(b->pins[10].name, "UART_RX", MRAA_PIN_NAME_SIZE);
b->pins[10].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 1 };
b->pins[10].gpio.pinmap = 15;
b->pins[10].gpio.pinmap = pin_base + 15;
b->pins[10].gpio.mux_total = 0;
b->pins[10].uart.parent_id = 0;
b->pins[10].uart.mux_total = 0;
strncpy(b->pins[11].name, "GPIO17", MRAA_PIN_NAME_SIZE);
b->pins[11].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[11].gpio.pinmap = 17;
b->pins[11].gpio.pinmap = pin_base + 17;
b->pins[11].gpio.mux_total = 0;
strncpy(b->pins[12].name, "GPIO18", MRAA_PIN_NAME_SIZE);
b->pins[12].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[12].gpio.pinmap = 18;
b->pins[12].gpio.pinmap = pin_base + 18;
b->pins[12].gpio.mux_total = 0;
if (platform_detected == PLATFORM_RASPBERRY_PI_B_REV_1) {
strncpy(b->pins[13].name, "GPIO21", MRAA_PIN_NAME_SIZE);
b->pins[13].gpio.pinmap = 21;
b->pins[13].gpio.pinmap = pin_base + 21;
} else {
strncpy(b->pins[13].name, "GPIO27", MRAA_PIN_NAME_SIZE);
b->pins[13].gpio.pinmap = 27;
b->pins[13].gpio.pinmap = pin_base + 27;
}
b->pins[13].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[13].gpio.mux_total = 0;
@@ -433,12 +461,12 @@ mraa_raspberry_pi()
strncpy(b->pins[15].name, "GPIO22", MRAA_PIN_NAME_SIZE);
b->pins[15].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[15].gpio.pinmap = 22;
b->pins[15].gpio.pinmap = pin_base + 22;
b->pins[15].gpio.mux_total = 0;
strncpy(b->pins[16].name, "GPIO23", MRAA_PIN_NAME_SIZE);
b->pins[16].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[16].gpio.pinmap = 23;
b->pins[16].gpio.pinmap = pin_base + 23;
b->pins[16].gpio.mux_total = 0;
strncpy(b->pins[17].name, "3V3", MRAA_PIN_NAME_SIZE);
@@ -446,12 +474,12 @@ mraa_raspberry_pi()
strncpy(b->pins[18].name, "GPIO24", MRAA_PIN_NAME_SIZE);
b->pins[18].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[18].gpio.pinmap = 24;
b->pins[18].gpio.pinmap = pin_base + 24;
b->pins[18].gpio.mux_total = 0;
strncpy(b->pins[19].name, "SPI_MOSI", MRAA_PIN_NAME_SIZE);
b->pins[19].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 1, 0, 0, 0 };
b->pins[19].gpio.pinmap = 10;
b->pins[19].gpio.pinmap = pin_base + 10;
b->pins[19].gpio.mux_total = 0;
b->pins[19].spi.pinmap = 0;
b->pins[19].spi.mux_total = 0;
@@ -461,26 +489,26 @@ mraa_raspberry_pi()
strncpy(b->pins[21].name, "SPI_MISO", MRAA_PIN_NAME_SIZE);
b->pins[21].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 1, 0, 0, 0 };
b->pins[21].gpio.pinmap = 9;
b->pins[21].gpio.pinmap = pin_base + 9;
b->pins[21].gpio.mux_total = 0;
b->pins[21].spi.pinmap = 0;
b->pins[21].spi.mux_total = 0;
strncpy(b->pins[22].name, "GPIO25", MRAA_PIN_NAME_SIZE);
b->pins[22].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[22].gpio.pinmap = 25;
b->pins[22].gpio.pinmap = pin_base + 25;
b->pins[22].gpio.mux_total = 0;
strncpy(b->pins[23].name, "SPI_CLK", MRAA_PIN_NAME_SIZE);
b->pins[23].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 1, 0, 0, 0 };
b->pins[23].gpio.pinmap = 11;
b->pins[23].gpio.pinmap = pin_base + 11;
b->pins[23].gpio.mux_total = 0;
b->pins[23].spi.pinmap = 0;
b->pins[23].spi.mux_total = 0;
strncpy(b->pins[24].name, "SPI_CS0", MRAA_PIN_NAME_SIZE);
b->pins[24].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 1, 0, 0, 0 };
b->pins[24].gpio.pinmap = 8;
b->pins[24].gpio.pinmap = pin_base + 8;
b->pins[24].gpio.mux_total = 0;
b->pins[24].spi.pinmap = 0;
b->pins[24].spi.mux_total = 0;
@@ -490,7 +518,7 @@ mraa_raspberry_pi()
strncpy(b->pins[26].name, "SPI_CS1", MRAA_PIN_NAME_SIZE);
b->pins[26].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 1, 0, 0, 0 };
b->pins[26].gpio.pinmap = 7;
b->pins[26].gpio.pinmap = pin_base + 7;
b->pins[26].gpio.mux_total = 0;
b->pins[26].spi.pinmap = 0;
b->pins[26].spi.mux_total = 0;
@@ -505,21 +533,21 @@ mraa_raspberry_pi()
strncpy(b->pins[29].name, "GPIO8", MRAA_PIN_NAME_SIZE);
b->pins[29].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[29].gpio.pinmap = 8;
b->pins[29].gpio.pinmap = pin_base + 8;
b->pins[29].gpio.mux_total = 0;
strncpy(b->pins[30].name, "GPIO9", MRAA_PIN_NAME_SIZE);
b->pins[30].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[30].gpio.pinmap = 9;
b->pins[30].gpio.pinmap = pin_base + 9;
b->pins[30].gpio.mux_total = 0;
strncpy(b->pins[31].name, "GPIO10", MRAA_PIN_NAME_SIZE);
b->pins[31].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[31].gpio.pinmap = 10;
b->pins[31].gpio.pinmap = pin_base + 10;
b->pins[31].gpio.mux_total = 0;
strncpy(b->pins[32].name, "GPIO11", MRAA_PIN_NAME_SIZE);
b->pins[32].gpio.pinmap = 11;
b->pins[32].gpio.pinmap = pin_base + 11;
b->pins[32].gpio.mux_total = 0;
b->pins[32].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
@@ -567,7 +595,7 @@ mraa_raspberry_pi()
strncpy(b->pins[29].name, "GPIO05", MRAA_PIN_NAME_SIZE);
b->pins[29].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[29].gpio.pinmap = 5;
b->pins[29].gpio.pinmap = pin_base + 5;
b->pins[29].gpio.mux_total = 0;
strncpy(b->pins[30].name, "GND", MRAA_PIN_NAME_SIZE);
@@ -575,17 +603,17 @@ mraa_raspberry_pi()
strncpy(b->pins[31].name, "GPIO06", MRAA_PIN_NAME_SIZE);
b->pins[31].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[31].gpio.pinmap = 6;
b->pins[31].gpio.pinmap = pin_base + 6;
b->pins[31].gpio.mux_total = 0;
strncpy(b->pins[32].name, "GPIO12", MRAA_PIN_NAME_SIZE);
b->pins[32].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[32].gpio.pinmap = 12;
b->pins[32].gpio.pinmap = pin_base + 12;
b->pins[32].gpio.mux_total = 0;
strncpy(b->pins[33].name, "GPIO13", MRAA_PIN_NAME_SIZE);
b->pins[33].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[33].gpio.pinmap = 13;
b->pins[33].gpio.pinmap = pin_base + 13;
b->pins[33].gpio.mux_total = 0;
strncpy(b->pins[34].name, "GND", MRAA_PIN_NAME_SIZE);
@@ -593,22 +621,22 @@ mraa_raspberry_pi()
strncpy(b->pins[35].name, "GPIO19", MRAA_PIN_NAME_SIZE);
b->pins[35].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[35].gpio.pinmap = 19;
b->pins[35].gpio.pinmap = pin_base + 19;
b->pins[35].gpio.mux_total = 0;
strncpy(b->pins[36].name, "GPIO16", MRAA_PIN_NAME_SIZE);
b->pins[36].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[36].gpio.pinmap = 16;
b->pins[36].gpio.pinmap = pin_base + 16;
b->pins[36].gpio.mux_total = 0;
strncpy(b->pins[37].name, "GPIO26", MRAA_PIN_NAME_SIZE);
b->pins[37].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[37].gpio.pinmap = 26;
b->pins[37].gpio.pinmap = pin_base + 26;
b->pins[37].gpio.mux_total = 0;
strncpy(b->pins[38].name, "GPIO20", MRAA_PIN_NAME_SIZE);
b->pins[38].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[38].gpio.pinmap = 20;
b->pins[38].gpio.pinmap = pin_base + 20;
b->pins[38].gpio.mux_total = 0;
strncpy(b->pins[39].name, "GND", MRAA_PIN_NAME_SIZE);
@@ -616,7 +644,7 @@ mraa_raspberry_pi()
strncpy(b->pins[40].name, "GPIO21", MRAA_PIN_NAME_SIZE);
b->pins[40].capabilities = (mraa_pincapabilities_t){ 1, 1, 0, 0, 0, 0, 0, 0 };
b->pins[40].gpio.pinmap = 21;
b->pins[40].gpio.pinmap = pin_base + 21;
b->pins[40].gpio.mux_total = 0;
}