1 files changed, 347 insertions, 0 deletions

diff --git a/drivers/char/tb0219.c b/drivers/char/tb0219.c
new file mode 100644
index 000000000000..5413f2908859
--- /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);