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[PATCH][MIPS][3/7] AR7: gpio char device

To: linux-mips@linux-mips.org
Subject: [PATCH][MIPS][3/7] AR7: gpio char device
From: Matteo Croce <technoboy85@gmail.com>
Date: Sat, 8 Sep 2007 02:20:17 +0200
Cc: Nicolas Thill <nico@openwrt.org>, openwrt-devel@lists.openwrt.org, Andrew Morton <akpm@linux-foundation.org>
Delivered-to: technoboy85@gmail.com
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Char device to access GPIO pins

Signed-off-by: Matteo Croce <technoboy85@gmail.com>
Signed-off-by: Nicolas Thill <nico@openwrt.org>

diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index b391776..d56cfd7 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -928,6 +928,15 @@ config MWAVE
          To compile this driver as a module, choose M here: the
          module will be called mwave.
 
+config AR7_GPIO
+       tristate "TI AR7 GPIO Support"
+       depends on AR7
+       help
+         Give userspace access to the GPIO pins on the Texas Instruments AR7
+         processors.
+
+         If compiled as a module, it will be called ar7_gpio.
+
 config SCx200_GPIO
        tristate "NatSemi SCx200 GPIO Support"
        depends on SCx200
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index d68ddbe..804319e 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -89,6 +89,7 @@ obj-$(CONFIG_COBALT_LCD)      += lcd.o
 obj-$(CONFIG_PPDEV)            += ppdev.o
 obj-$(CONFIG_NWBUTTON)         += nwbutton.o
 obj-$(CONFIG_NWFLASH)          += nwflash.o
+obj-$(CONFIG_AR7_GPIO)         += ar7_gpio.o
 obj-$(CONFIG_SCx200_GPIO)      += scx200_gpio.o
 obj-$(CONFIG_PC8736x_GPIO)     += pc8736x_gpio.o
 obj-$(CONFIG_NSC_GPIO)         += nsc_gpio.o
diff --git a/drivers/char/ar7_gpio.c b/drivers/char/ar7_gpio.c
new file mode 100644
index 0000000..d57a23e
--- /dev/null
+++ b/drivers/char/ar7_gpio.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (C) 2007 Nicolas Thill <nico@openwrt.org>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include <linux/types.h>
+#include <linux/cdev.h>
+#include <gpio.h>
+
+#define DRVNAME "ar7_gpio"
+#define LONGNAME "TI AR7 GPIOs Driver"
+
+MODULE_AUTHOR("Nicolas Thill <nico@openwrt.org>");
+MODULE_DESCRIPTION(LONGNAME);
+MODULE_LICENSE("GPL");
+
+static int ar7_gpio_major;
+
+static ssize_t ar7_gpio_write(struct file *file, const char __user *buf,
+       size_t len, loff_t *ppos)
+{
+       int pin = iminor(file->f_dentry->d_inode);
+       size_t i;
+
+       for (i = 0; i < len; ++i) {
+               char c;
+               if (get_user(c, buf + i))
+                       return -EFAULT;
+               switch (c) {
+               case '0':
+                       gpio_set_value(pin, 0);
+                       break;
+               case '1':
+                       gpio_set_value(pin, 1);
+                       break;
+               case 'd':
+               case 'D':
+                       ar7_gpio_disable(pin);
+                       break;
+               case 'e':
+               case 'E':
+                       ar7_gpio_enable(pin);
+                       break;
+               case 'i':
+               case 'I':
+               case '<':
+                       gpio_direction_input(pin);
+                       break;
+               case 'o':
+               case 'O':
+               case '>':
+                       gpio_direction_output(pin);
+                       break;
+               default:
+                       return -EINVAL;
+               }
+       }
+
+       return len;
+}
+
+static ssize_t ar7_gpio_read(struct file *file, char __user *buf,
+       size_t len, loff_t *ppos)
+{
+       int pin = iminor(file->f_dentry->d_inode);
+       int value;
+
+       value = gpio_get_value(pin);
+       if (put_user(value ? '1' : '0', buf))
+               return -EFAULT;
+
+       return 1;
+}
+
+static int ar7_gpio_open(struct inode *inode, struct file *file)
+{
+       int m = iminor(inode);
+
+       if (m >= AR7_GPIO_MAX)
+               return -EINVAL;
+
+       return nonseekable_open(inode, file);
+}
+
+static int ar7_gpio_release(struct inode *inode, struct file *file)
+{
+       return 0;
+}
+
+static const struct file_operations ar7_gpio_fops = {
+       .owner   = THIS_MODULE,
+       .write   = ar7_gpio_write,
+       .read    = ar7_gpio_read,
+       .open    = ar7_gpio_open,
+       .release = ar7_gpio_release,
+       .llseek  = no_llseek,
+};
+
+static struct platform_device *ar7_gpio_device;
+
+static int __init ar7_gpio_init(void)
+{
+       int rc;
+
+       ar7_gpio_device = platform_device_alloc(DRVNAME, -1);
+       if (!ar7_gpio_device)
+               return -ENOMEM;
+
+       rc = platform_device_add(ar7_gpio_device);
+       if (rc < 0)
+               goto out_put;
+
+       rc = register_chrdev(ar7_gpio_major, DRVNAME, &ar7_gpio_fops);
+       if (rc < 0)
+               goto out_put;
+
+       ar7_gpio_major = rc;
+
+       rc = 0;
+
+       goto out;
+
+out_put:
+       platform_device_put(ar7_gpio_device);
+out:
+       return rc;
+}
+
+static void __exit ar7_gpio_exit(void)
+{
+       unregister_chrdev(ar7_gpio_major, DRVNAME);
+       platform_device_unregister(ar7_gpio_device);
+}
+
+module_init(ar7_gpio_init);
+module_exit(ar7_gpio_exit);

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