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Release 4.14 drivers/char/tb0219.c

Directory: drivers/char
/*
 *  Driver for TANBAC TB0219 base board.
 *
 *  Copyright (C) 2005  Yoichi Yuasa <yuasa@linux-mips.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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <linux/platform_device.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/uaccess.h>

#include <asm/io.h>
#include <asm/reboot.h>
#include <asm/vr41xx/giu.h>
#include <asm/vr41xx/tb0219.h>

MODULE_AUTHOR("Yoichi Yuasa <yuasa@linux-mips.org>");
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 DEFINE_SPINLOCK(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); }

Contributors

PersonTokensPropCommitsCommitProp
Yoichi Yuasa18100.00%1100.00%
Total18100.00%1100.00%


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'; }

Contributors

PersonTokensPropCommitsCommitProp
Yoichi Yuasa37100.00%1100.00%
Total37100.00%1100.00%


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'; }

Contributors

PersonTokensPropCommitsCommitProp
Yoichi Yuasa37100.00%1100.00%
Total37100.00%1100.00%


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'; }

Contributors

PersonTokensPropCommitsCommitProp
Yoichi Yuasa37100.00%1100.00%
Total37100.00%1100.00%


static inline int set_led(char command) { tb0219_write(TB0219_LED, command); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Yoichi Yuasa20100.00%1100.00%
Total20100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Yoichi Yuasa90100.00%1100.00%
Total90100.00%1100.00%


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_inode(file)); 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; }

Contributors

PersonTokensPropCommitsCommitProp
Yoichi Yuasa12897.71%150.00%
Al Viro32.29%150.00%
Total131100.00%2100.00%


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_inode(file)); 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; }

Contributors

PersonTokensPropCommitsCommitProp
Yoichi Yuasa15098.04%150.00%
Al Viro31.96%150.00%
Total153100.00%2100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Yoichi Yuasa65100.00%1100.00%
Total65100.00%1100.00%


static int tanbac_tb0219_release(struct inode *inode, struct file *file) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Yoichi Yuasa19100.00%1100.00%
Total19100.00%1100.00%

static const struct file_operations tb0219_fops = { .owner = THIS_MODULE, .read = tanbac_tb0219_read, .write = tanbac_tb0219_write, .open = tanbac_tb0219_open, .release = tanbac_tb0219_release, .llseek = no_llseek, };
static void tb0219_restart(char *command) { tb0219_write(TB0219_RESET, 0); }

Contributors

PersonTokensPropCommitsCommitProp
Yoichi Yuasa17100.00%1100.00%
Total17100.00%1100.00%


static void tb0219_pci_irq_init(void) { /* PCI Slot 1 */ vr41xx_set_irq_trigger(TB0219_PCI_SLOT1_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH); vr41xx_set_irq_level(TB0219_PCI_SLOT1_PIN, IRQ_LEVEL_LOW); /* PCI Slot 2 */ vr41xx_set_irq_trigger(TB0219_PCI_SLOT2_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH); vr41xx_set_irq_level(TB0219_PCI_SLOT2_PIN, IRQ_LEVEL_LOW); /* PCI Slot 3 */ vr41xx_set_irq_trigger(TB0219_PCI_SLOT3_PIN, IRQ_TRIGGER_LEVEL, IRQ_SIGNAL_THROUGH); vr41xx_set_irq_level(TB0219_PCI_SLOT3_PIN, IRQ_LEVEL_LOW); }

Contributors

PersonTokensPropCommitsCommitProp
Yoichi Yuasa59100.00%1100.00%
Total59100.00%1100.00%


static int tb0219_probe(struct platform_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; } old_machine_restart = _machine_restart; _machine_restart = tb0219_restart; tb0219_pci_irq_init(); if (major == 0) { major = retval; printk(KERN_INFO "TB0219: major number %d\n", major); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Yoichi Yuasa13199.24%266.67%
Russell King10.76%133.33%
Total132100.00%3100.00%


static int tb0219_remove(struct platform_device *dev) { _machine_restart = old_machine_restart; iounmap(tb0219_base); tb0219_base = NULL; release_mem_region(TB0219_START, TB0219_SIZE); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Yoichi Yuasa3397.06%150.00%
Russell King12.94%150.00%
Total34100.00%2100.00%

static struct platform_device *tb0219_platform_device; static struct platform_driver tb0219_device_driver = { .probe = tb0219_probe, .remove = tb0219_remove, .driver = { .name = "TB0219", }, };
static int __init tanbac_tb0219_init(void) { int retval; tb0219_platform_device = platform_device_alloc("TB0219", -1); if (!tb0219_platform_device) return -ENOMEM; retval = platform_device_add(tb0219_platform_device); if (retval < 0) { platform_device_put(tb0219_platform_device); return retval; } retval = platform_driver_register(&tb0219_device_driver); if (retval < 0) platform_device_unregister(tb0219_platform_device); return retval; }

Contributors

PersonTokensPropCommitsCommitProp
Yoichi Yuasa5167.11%133.33%
Dmitry Torokhov2431.58%133.33%
Russell King11.32%133.33%
Total76100.00%3100.00%


static void __exit tanbac_tb0219_exit(void) { platform_driver_unregister(&tb0219_device_driver); platform_device_unregister(tb0219_platform_device); }

Contributors

PersonTokensPropCommitsCommitProp
Yoichi Yuasa1890.00%133.33%
Russell King15.00%133.33%
Dmitry Torokhov15.00%133.33%
Total20100.00%3100.00%

module_init(tanbac_tb0219_init); module_exit(tanbac_tb0219_exit);

Overall Contributors

PersonTokensPropCommitsCommitProp
Yoichi Yuasa112595.02%327.27%
Dmitry Torokhov252.11%19.09%
Russell King151.27%218.18%
Al Viro90.76%218.18%
Arnd Bergmann50.42%19.09%
Thomas Gleixner40.34%19.09%
Arjan van de Ven10.08%19.09%
Total1184100.00%11100.00%
Directory: drivers/char
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