1 files changed, 347 insertions, 0 deletions
diff --git a/drivers/char/tb0219.c b/drivers/char/tb0219.c
new file mode 100644
index 0000000..5413f29
--- /dev/null
+++ b/drivers/char/tb0219.c
@@ -0,0 +1,347 @@
+/*
+ *  Driver for TANBAC TB0219 base board.
+ *
+ *  Copyright (C) 2005  Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <asm/io.h>
+#include <asm/reboot.h>
+
+MODULE_AUTHOR("Yoichi Yuasa <yuasa@hh.iij4u.or.jp>");
+MODULE_DESCRIPTION("TANBAC TB0219 base board driver");
+MODULE_LICENSE("GPL");
+
+static int major;	/* default is dynamic major device number */
+module_param(major, int, 0);
+MODULE_PARM_DESC(major, "Major device number");
+
+static void (*old_machine_restart)(char *command);
+static void __iomem *tb0219_base;
+static spinlock_t tb0219_lock;
+
+#define tb0219_read(offset)		readw(tb0219_base + (offset))
+#define tb0219_write(offset, value)	writew((value), tb0219_base + (offset))
+
+#define TB0219_START	0x0a000000UL
+#define TB0219_SIZE	0x20UL
+
+#define TB0219_LED			0x00
+#define TB0219_GPIO_INPUT		0x02
+#define TB0219_GPIO_OUTPUT		0x04
+#define TB0219_DIP_SWITCH		0x06
+#define TB0219_MISC			0x08
+#define TB0219_RESET			0x0e
+#define TB0219_PCI_SLOT1_IRQ_STATUS	0x10
+#define TB0219_PCI_SLOT2_IRQ_STATUS	0x12
+#define TB0219_PCI_SLOT3_IRQ_STATUS	0x14
+
+typedef enum {
+	TYPE_LED,
+	TYPE_GPIO_OUTPUT,
+} tb0219_type_t;
+
+/*
+ * Minor device number
+ *	 0 = 7 segment LED
+ *
+ *	16 = GPIO IN 0
+ *	17 = GPIO IN 1
+ *	18 = GPIO IN 2
+ *	19 = GPIO IN 3
+ *	20 = GPIO IN 4
+ *	21 = GPIO IN 5
+ *	22 = GPIO IN 6
+ *	23 = GPIO IN 7
+ *
+ *	32 = GPIO OUT 0
+ *	33 = GPIO OUT 1
+ *	34 = GPIO OUT 2
+ *	35 = GPIO OUT 3
+ *	36 = GPIO OUT 4
+ *	37 = GPIO OUT 5
+ *	38 = GPIO OUT 6
+ *	39 = GPIO OUT 7
+ *
+ *	48 = DIP switch 1
+ *	49 = DIP switch 2
+ *	50 = DIP switch 3
+ *	51 = DIP switch 4
+ *	52 = DIP switch 5
+ *	53 = DIP switch 6
+ *	54 = DIP switch 7
+ *	55 = DIP switch 8
+ */
+
+static inline char get_led(void)
+{
+	return (char)tb0219_read(TB0219_LED);
+}
+
+static inline char get_gpio_input_pin(unsigned int pin)
+{
+	uint16_t values;
+
+	values = tb0219_read(TB0219_GPIO_INPUT);
+	if (values & (1 << pin))
+		return '1';
+
+	return '0';
+}
+
+static inline char get_gpio_output_pin(unsigned int pin)
+{
+	uint16_t values;
+
+	values = tb0219_read(TB0219_GPIO_OUTPUT);
+	if (values & (1 << pin))
+		return '1';
+
+	return '0';
+}
+
+static inline char get_dip_switch(unsigned int pin)
+{
+	uint16_t values;
+
+	values = tb0219_read(TB0219_DIP_SWITCH);
+	if (values & (1 << pin))
+		return '1';
+
+	return '0';
+}
+
+static inline int set_led(char command)
+{
+	tb0219_write(TB0219_LED, command);
+
+	return 0;
+}
+
+static inline int set_gpio_output_pin(unsigned int pin, char command)
+{
+	unsigned long flags;
+	uint16_t value;
+
+	if (command != '0' && command != '1')
+		return -EINVAL;
+
+	spin_lock_irqsave(&tb0219_lock, flags);
+	value = tb0219_read(TB0219_GPIO_OUTPUT);
+	if (command == '0')
+		value &= ~(1 << pin);
+	else
+		value |= 1 << pin;
+	tb0219_write(TB0219_GPIO_OUTPUT, value);
+	spin_unlock_irqrestore(&tb0219_lock, flags);
+
+	return 0;
+
+}
+
+static ssize_t tanbac_tb0219_read(struct file *file, char __user *buf, size_t len,
+                                  loff_t *ppos)
+{
+	unsigned int minor;
+	char value;
+
+	minor = iminor(file->f_dentry->d_inode);
+	switch (minor) {
+	case 0:
+		value = get_led();
+		break;
+	case 16 ... 23:
+		value = get_gpio_input_pin(minor - 16);
+		break;
+	case 32 ... 39:
+		value = get_gpio_output_pin(minor - 32);
+		break;
+	case 48 ... 55:
+		value = get_dip_switch(minor - 48);
+		break;
+	default:
+		return -EBADF;
+	}
+
+	if (len <= 0)
+		return -EFAULT;
+
+	if (put_user(value, buf))
+		return -EFAULT;
+
+	return 1;
+}
+
+static ssize_t tanbac_tb0219_write(struct file *file, const char __user *data,
+                                   size_t len, loff_t *ppos)
+{
+	unsigned int minor;
+	tb0219_type_t type;
+	size_t i;
+	int retval = 0;
+	char c;
+
+	minor = iminor(file->f_dentry->d_inode);
+	switch (minor) {
+	case 0:
+		type = TYPE_LED;
+		break;
+	case 32 ... 39:
+		type = TYPE_GPIO_OUTPUT;
+		break;
+	default:
+		return -EBADF;
+	}
+
+	for (i = 0; i < len; i++) {
+		if (get_user(c, data + i))
+			return -EFAULT;
+
+		switch (type) {
+		case TYPE_LED:
+			retval = set_led(c);
+			break;
+		case TYPE_GPIO_OUTPUT:
+			retval = set_gpio_output_pin(minor - 32, c);
+			break;
+		}
+
+		if (retval < 0)
+			break;
+	}
+
+	return i;
+}
+
+static int tanbac_tb0219_open(struct inode *inode, struct file *file)
+{
+	unsigned int minor;
+
+	minor = iminor(inode);
+	switch (minor) {
+	case 0:
+	case 16 ... 23:
+	case 32 ... 39:
+	case 48 ... 55:
+		return nonseekable_open(inode, file);
+	default:
+		break;
+	}
+
+	return -EBADF;
+}
+
+static int tanbac_tb0219_release(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+static struct file_operations tb0219_fops = {
+	.owner		= THIS_MODULE,
+	.read		= tanbac_tb0219_read,
+	.write		= tanbac_tb0219_write,
+	.open		= tanbac_tb0219_open,
+	.release	= tanbac_tb0219_release,
+};
+
+static void tb0219_restart(char *command)
+{
+	tb0219_write(TB0219_RESET, 0);
+}
+
+static int tb0219_probe(struct device *dev)
+{
+	int retval;
+
+	if (request_mem_region(TB0219_START, TB0219_SIZE, "TB0219") == NULL)
+		return -EBUSY;
+
+	tb0219_base = ioremap(TB0219_START, TB0219_SIZE);
+	if (tb0219_base == NULL) {
+		release_mem_region(TB0219_START, TB0219_SIZE);
+		return -ENOMEM;
+	}
+
+	retval = register_chrdev(major, "TB0219", &tb0219_fops);
+	if (retval < 0) {
+		iounmap(tb0219_base);
+		tb0219_base = NULL;
+		release_mem_region(TB0219_START, TB0219_SIZE);
+		return retval;
+	}
+
+	spin_lock_init(&tb0219_lock);
+
+	old_machine_restart = _machine_restart;
+	_machine_restart = tb0219_restart;
+
+	if (major == 0) {
+		major = retval;
+		printk(KERN_INFO "TB0219: major number %d\n", major);
+	}
+
+	return 0;
+}
+
+static int tb0219_remove(struct device *dev)
+{
+	_machine_restart = old_machine_restart;
+
+	iounmap(tb0219_base);
+	tb0219_base = NULL;
+
+	release_mem_region(TB0219_START, TB0219_SIZE);
+
+	return 0;
+}
+
+static struct platform_device *tb0219_platform_device;
+
+static struct device_driver tb0219_device_driver = {
+	.name		= "TB0219",
+	.bus		= &platform_bus_type,
+	.probe		= tb0219_probe,
+	.remove		= tb0219_remove,
+};
+
+static int __devinit tanbac_tb0219_init(void)
+{
+	int retval;
+
+	tb0219_platform_device = platform_device_register_simple("TB0219", -1, NULL, 0);
+	if (IS_ERR(tb0219_platform_device))
+		return PTR_ERR(tb0219_platform_device);
+
+	retval = driver_register(&tb0219_device_driver);
+	if (retval < 0)
+		platform_device_unregister(tb0219_platform_device);
+
+	return retval;
+}
+
+static void __devexit tanbac_tb0219_exit(void)
+{
+	driver_unregister(&tb0219_device_driver);
+
+	platform_device_unregister(tb0219_platform_device);
+}
+
+module_init(tanbac_tb0219_init);
+module_exit(tanbac_tb0219_exit);