Adding blink driver demo

Examples/drivers/blink/Makefile

@@ -0,0 +1,20 @@
+EXTRA_CFLAGS += -Wall
+CC            = mipsel-openwrt-linux-gcc
+OPENWRT_BASE  = /home/cain/Embedded/ingenic/sakc/build/openwrt-xburst
+KERNEL_SRC    = $(OPENWRT_BASE)/build_dir/linux-xburst_qi_lb60/linux-2.6.32.10/
+CROSS_COMPILE = mipsel-openwrt-linux-
+
+obj-m +=  blinker.o 
+all: driver #main
+
+driver:
+	make -C $(KERNEL_SRC) M=$(PWD) ARCH=mips CROSS_COMPILE=$(CROSS_COMPILE) modules
+clean:
+	make -C $(KERNEL_SRC) M=$(PWD) ARCH=mips CROSS_COMPILE=$(CROSS_COMPILE) clean
+	rm -rf *.o main.o main irq.ko Modules.symvers
+
+main: main.o
+
+PREPROCESS.c = $(CC) $(CFLAGS) $(TARGET_ARCH) -E -Wp,-C,-dD,-dI
+%.pp : %.c FORCE
+	$(PREPROCESS.c) $< > $@

Examples/drivers/blink/blinker.c

@@ -0,0 +1,124 @@
+/*
+ *  blinker     device driver
+ *
+ *  Author:     Carlos Camargo
+ *  Created:    Abril 29 2010
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <linux/module.h>       /* Needed by all modules */
+#include <linux/kernel.h>       /* Needed for KERN_INFO */
+#include <linux/ioport.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>  /* We want an interrupt */
+#include <linux/irq.h>        /* We want an interrupt */
+#include <linux/platform_device.h>
+#include <linux/fs.h>
+#include <asm/delay.h>
+#include <linux/delay.h>
+
+#include <asm/uaccess.h>  
+#include <asm/io.h>
+#include <linux/gpio.h>
+#include <asm/mach-jz4740/gpio.h>
+
+#define LED_PORT	JZ_GPIO_BASE_C
+#define LED_PIN         JZ_GPIO_PORTC(8)
+
+
+#define SUCCESS 0
+#define DEVICE_NAME "blink" /* Dev name as it appears in /proc/devices   */
+#define BUF_LEN 80    /* Max length of the message from the device */
+
+static int is_device_open = 0; /* Used to prevent multiple access to device */
+static int Major;
+
+static int device_open(struct inode *inode, struct file *file)
+{
+
+  unsigned int i;
+  printk( KERN_INFO "Open BLINKER\n" );
+  if (is_device_open)
+    return -EBUSY;
+
+  is_device_open = 1;
+
+
+  for( i=0; i<5; i++ ){
+    gpio_set_value(LED_PIN, 1);
+    mdelay(0x0040);
+    gpio_set_value(LED_PIN, 0);
+    mdelay(0x0040);
+  }
+
+  try_module_get(THIS_MODULE);
+
+  return SUCCESS;
+}
+
+static int device_release(struct inode *inode, struct file *file)
+{ 
+  is_device_open = 0;
+
+  gpio_set_value(LED_PIN, 0);
+
+  module_put(THIS_MODULE);
+
+  printk( KERN_INFO "Close BLINKER\n" );
+
+  return 0;
+}
+
+struct file_operations fops = {
+  .open    = device_open,
+  .release = device_release,
+};
+
+static int __init blink_init(void)
+{
+  printk(KERN_INFO "BLINK module is Up.\n");
+
+  Major = register_chrdev(0, DEVICE_NAME, &fops);         
+
+  if (Major < 0) {
+    printk(KERN_ALERT "Registering char device failed with %d\n", Major);
+    return Major;
+  } 
+
+  printk(KERN_ALERT  "I was assigned major number %d. To talk to\n", Major);
+  printk(KERN_ALERT  "the driver, create a dev file with\n");
+  printk(KERN_ALERT  "'mknod /dev/%s c %d 0'.\n", DEVICE_NAME, Major);
+
+  jz_gpio_set_function(LED_PIN, JZ_GPIO_FUNC_NONE);
+  gpio_direction_output(LED_PIN,0);
+  gpio_set_value(LED_PIN, 1);
+
+
+  return 0;
+}
+
+
+static void __exit blink_exit(void)
+{
+  gpio_set_value(LED_PIN, 0);
+  unregister_chrdev(Major, DEVICE_NAME);
+  printk( KERN_INFO "BLINK driver is down...\n" );
+}
+
+
+module_init(blink_init);
+module_exit(blink_exit);
+
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Carlos Camargo <cicamargoba@gmail.com>");
+MODULE_DESCRIPTION("BLINKER LED driver");
+MODULE_VERSION("1:0.1");
+
+
+