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path: root/drivers/char/tb0219.c
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Diffstat (limited to 'drivers/char/tb0219.c')
-rw-r--r--drivers/char/tb0219.c347
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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 10:30:59 +0000