still works after split

driver/ls7366r.c

@@ -0,0 +1,140 @@
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/mod_devicetable.h>
+#include <linux/property.h>
+#include <linux/platform_device.h>
+#include <linux/of_device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/spi/spi.h>
+#include <linux/interrupt.h>
+#include <linux/of_irq.h>
+#include <linux/workqueue.h>
+
+#include "ls7366r.h"
+
+
+/* spi stuff */
+static int dt_ls7366r_probe(struct spi_device *client);
+static void dt_ls7366r_remove(struct spi_device *client);
+
+/*    LS7366R functions */
+static int writeCmd(struct spi_device *client, u8 c) {
+  u8 buf[1];
+  buf[0] = c;
+  return spi_write(client, buf, 1);
+}
+
+static int writeCmdData(struct spi_device *client, u8 c, u8 d) {
+  u8 buf[2];
+  buf[0] = c;
+  buf[1] = d;
+  return spi_write(client, buf, 2);
+}
+
+int read32(struct spi_device *client, u8 c, u32 *r) {
+  u8 tx_buf[5];
+  tx_buf[0] = c;
+  u8 rx_buf[5];
+  struct spi_transfer t = {
+    .tx_buf = tx_buf,
+    .rx_buf = rx_buf,
+    .len = 5,
+  };
+  int ret = spi_sync_transfer(client, &t, 1);
+  if (ret < 0) {
+    printk("counter - Error! spi_sync_transfer failed in read32\n");
+    return ret;
+  }
+  *r = ((u32)rx_buf[1] << 24) | ((u32)rx_buf[2] << 16) | ((u32)rx_buf[3] << 8) | ((u32)rx_buf[4]);
+  return 0;
+}
+
+static int read8(struct spi_device *client, u8 c, u8 *r) {
+  u8 tx_buf[2];
+  tx_buf[0] = c;
+  u8 rx_buf[2];
+  struct spi_transfer t = {
+    .tx_buf = tx_buf,
+    .rx_buf = rx_buf,
+    .len = 2,
+  };
+  int ret = spi_sync_transfer(client, &t, 1);
+  if (ret < 0) {
+    printk("counter - Error! spi_sync_transfer failed in read8\n");
+    return ret;
+  }
+  *r = rx_buf[1];
+  return 0;
+}
+
+
+static struct of_device_id ls7366r_driver_ids[] = {
+  {
+    .compatible = "hottis,ls7366r",
+  }, {}
+};
+MODULE_DEVICE_TABLE(of, ls7366r_driver_ids);
+
+static struct spi_device_id ls7366r[] = {
+  { "ls7366r", 0 },
+  {},
+};
+MODULE_DEVICE_TABLE(spi, ls7366r);
+
+struct spi_driver ls7366r_driver = {
+  .probe = dt_ls7366r_probe,
+  .remove = dt_ls7366r_remove,
+  .id_table = ls7366r,
+  .driver = {
+    .name = "ls7366r_device_driver",
+    .of_match_table = ls7366r_driver_ids,
+  },
+};
+
+struct spi_device *ls7366r_spi_client;
+
+static int dt_ls7366r_probe(struct spi_device *client) {
+  printk("counter - ls7366r probing\n");
+  
+  int ret = spi_setup(client);
+  if (ret < 0) {
+    printk("counter - Error! Failed to set up the SPI bus\n");
+    return ret;
+  }
+
+  ret = writeCmd(client, CMD_CLR | REG_STR);
+  if (ret < 0) {
+    printk("counter - Error! writeCmd 1 failed in probe\n");
+    return ret;
+  }
+  ret = writeCmd(client, CMD_CLR | REG_CNTR);
+  if (ret < 0) {
+    printk("counter - Error! writeCmd 2 failed in probe\n");
+    return ret;
+  }
+  ret = writeCmdData(client, CMD_WR | REG_MDR0, MDR0_ILO);
+  if (ret < 0) {
+    printk("counter - Error! writeCmdData failed in probe\n");
+    return ret;
+  }
+
+  u8 x;
+  ret = read8(client, CMD_RD | REG_MDR0, &x);
+  if (ret < 0) {
+    printk("counter - Error! read8 failed in probe\n");
+    return ret;
+  }
+  if (x != MDR0_ILO) {
+    printk("counter - Error! failed to initialize counter\n");
+    return -1;
+  }
+
+  ls7366r_spi_client = client;
+
+  return 0;
+}
+
+static void dt_ls7366r_remove(struct spi_device *client) {
+  printk("counter - ls7366r removing\n");
+}
+