spi example

4.9.11/examples/Makefile

@@ -28,6 +28,7 @@ obj-m += example_rwlock.o
 obj-m += example_atomic.o
 obj-m += example_mutex.o
 obj-m += bottomhalf.o
+obj-m += example_spi.o
 
 all:
 	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

4.9.11/examples/example_spi.c

@@ -0,0 +1,47 @@
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/spi/spi.h>
+
+static int spi_probe(struct spi_device *spi)
+{
+    int ret;
+
+    printk("spi example probe\n");
+
+    spi->bits_per_word = 8;
+    spi->mode = SPI_MODE_0;
+    ret = spi_setup(spi);
+    if (ret < 0)
+        return ret;
+
+    printk("spi device name = %s \n", spi->modalias);
+    printk("spi device freq = %d \n", spi->max_speed_hz);
+    printk("spi device's bus_num = %d \n", spi->master->bus_num);
+    printk("spi device cs  = %d \n", spi->chip_select);
+    printk("spi device mode = %d \n\n", spi->mode);
+
+    return 0;
+}
+
+static int spi_remove(struct spi_device *spi)
+{
+    printk("spi example remove\n");
+
+    /* Your spi remove code */
+
+    return 0;
+}
+
+static struct spi_driver my_spi_driver = {
+    .driver = {
+        .name = "my_spi",
+    },
+    .probe = spi_probe,
+    .remove = spi_remove,
+};
+
+module_spi_driver(my_spi_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Bob Mottram");
+MODULE_DESCRIPTION("SPI driver module example");