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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/parisc/eisa_eeprom.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/parisc/eisa_eeprom.c')
-rw-r--r-- | drivers/parisc/eisa_eeprom.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/drivers/parisc/eisa_eeprom.c b/drivers/parisc/eisa_eeprom.c new file mode 100644 index 000000000..443b15422 --- /dev/null +++ b/drivers/parisc/eisa_eeprom.c @@ -0,0 +1,101 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * EISA "eeprom" support routines + * + * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org> + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/miscdevice.h> +#include <linux/slab.h> +#include <linux/fs.h> +#include <asm/io.h> +#include <linux/uaccess.h> +#include <asm/eisa_eeprom.h> + +#define EISA_EEPROM_MINOR 241 + +static loff_t eisa_eeprom_llseek(struct file *file, loff_t offset, int origin) +{ + return fixed_size_llseek(file, offset, origin, HPEE_MAX_LENGTH); +} + +static ssize_t eisa_eeprom_read(struct file * file, + char __user *buf, size_t count, loff_t *ppos ) +{ + unsigned char *tmp; + ssize_t ret; + int i; + + if (*ppos < 0 || *ppos >= HPEE_MAX_LENGTH) + return 0; + + count = *ppos + count < HPEE_MAX_LENGTH ? count : HPEE_MAX_LENGTH - *ppos; + tmp = kmalloc(count, GFP_KERNEL); + if (tmp) { + for (i = 0; i < count; i++) + tmp[i] = readb(eisa_eeprom_addr+(*ppos)++); + + if (copy_to_user (buf, tmp, count)) + ret = -EFAULT; + else + ret = count; + kfree (tmp); + } else + ret = -ENOMEM; + + return ret; +} + +static int eisa_eeprom_open(struct inode *inode, struct file *file) +{ + if (file->f_mode & FMODE_WRITE) + return -EINVAL; + + return 0; +} + +static int eisa_eeprom_release(struct inode *inode, struct file *file) +{ + return 0; +} + +/* + * The various file operations we support. + */ +static const struct file_operations eisa_eeprom_fops = { + .owner = THIS_MODULE, + .llseek = eisa_eeprom_llseek, + .read = eisa_eeprom_read, + .open = eisa_eeprom_open, + .release = eisa_eeprom_release, +}; + +static struct miscdevice eisa_eeprom_dev = { + EISA_EEPROM_MINOR, + "eisa_eeprom", + &eisa_eeprom_fops +}; + +static int __init eisa_eeprom_init(void) +{ + int retval; + + if (!eisa_eeprom_addr) + return -ENODEV; + + retval = misc_register(&eisa_eeprom_dev); + if (retval < 0) { + printk(KERN_ERR "EISA EEPROM: cannot register misc device.\n"); + return retval; + } + + printk(KERN_INFO "EISA EEPROM at 0x%px\n", eisa_eeprom_addr); + return 0; +} + +MODULE_LICENSE("GPL"); + +module_init(eisa_eeprom_init); |