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modules: low-speed-spidev will not load if MinnowBoard is not detected. #17

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modules: low-speed-spidev will not load if MinnowBoard is not detected. #17

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10 changes: 10 additions & 0 deletions modules/low-speed-spidev/low-speed-spidev.c
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Original file line number Diff line number Diff line change
Expand Up @@ -20,12 +20,14 @@
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <linux/dmi.h>

#if (!defined(CONFIG_SPI_SPIDEV_MODULE) && !defined(CONFIG_SPI_SPIDEV))
#error SPI_SPIDEV is required.
#endif

/* Change these values to what your board uses. */
#define BOARD_NAME "MinnowBoard"
#define LOW_SPEED_SPIDEV_SPI_BUS 0
#define LOW_SPEED_SPIDEV_SPI_CS 0
#define LOW_SPEED_SPIDEV_MAX_CLK_HZ 1000000
Expand All @@ -48,6 +50,14 @@ static int __init low_speed_spidev_module_init(void)

err = -ENODEV;

const char* board_name = dmi_get_system_info(DMI_BOARD_NAME);
pr_info("board name=%s\n", board_name);

if (strncmp(board_name, BOARD_NAME, strlen(BOARD_NAME)) != 0) {
pr_info("%s not detected\n", BOARD_NAME);
goto out;
}

master = spi_busnum_to_master(LOW_SPEED_SPIDEV_SPI_BUS);
pr_info("master=%p\n", master);
if (!master)
Expand Down