[net-next-2.6.git] / drivers / char / generic_nvram.c

/*
 * Generic /dev/nvram driver for architectures providing some
 * "generic" hooks, that is :
 *
 * nvram_read_byte, nvram_write_byte, nvram_sync
 *
 * Note that an additional hook is supported for PowerMac only
 * for getting the nvram "partition" informations
 *
 */

#define NVRAM_VERSION "1.1"

#include <linux/module.h>

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/fcntl.h>
#include <linux/init.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include <asm/nvram.h>
#ifdef CONFIG_PPC_PMAC
#include <asm/machdep.h>
#endif

#define NVRAM_SIZE	8192

static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
{
	lock_kernel();
	switch (origin) {
	case 1:
		offset += file->f_pos;
		break;
	case 2:
		offset += NVRAM_SIZE;
		break;
	}
	if (offset < 0) {
		unlock_kernel();
		return -EINVAL;
	}
	file->f_pos = offset;
	unlock_kernel();
	return file->f_pos;
}

static ssize_t read_nvram(struct file *file, char __user *buf,
			  size_t count, loff_t *ppos)
{
	unsigned int i;
	char __user *p = buf;

	if (!access_ok(VERIFY_WRITE, buf, count))
		return -EFAULT;
	if (*ppos >= NVRAM_SIZE)
		return 0;
	for (i = *ppos; count > 0 && i < NVRAM_SIZE; ++i, ++p, --count)
		if (__put_user(nvram_read_byte(i), p))
			return -EFAULT;
	*ppos = i;
	return p - buf;
}

static ssize_t write_nvram(struct file *file, const char __user *buf,
			   size_t count, loff_t *ppos)
{
	unsigned int i;
	const char __user *p = buf;
	char c;

	if (!access_ok(VERIFY_READ, buf, count))
		return -EFAULT;
	if (*ppos >= NVRAM_SIZE)
		return 0;
	for (i = *ppos; count > 0 && i < NVRAM_SIZE; ++i, ++p, --count) {
		if (__get_user(c, p))
			return -EFAULT;
		nvram_write_byte(c, i);
	}
	*ppos = i;
	return p - buf;
}

static int nvram_ioctl(struct inode *inode, struct file *file,
	unsigned int cmd, unsigned long arg)
{
	switch(cmd) {
#ifdef CONFIG_PPC_PMAC
	case OBSOLETE_PMAC_NVRAM_GET_OFFSET:
		printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n");
	case IOC_NVRAM_GET_OFFSET: {
		int part, offset;

		if (!machine_is(powermac))
			return -EINVAL;
		if (copy_from_user(&part, (void __user*)arg, sizeof(part)) != 0)
			return -EFAULT;
		if (part < pmac_nvram_OF || part > pmac_nvram_NR)
			return -EINVAL;
		offset = pmac_get_partition(part);
		if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0)
			return -EFAULT;
		break;
	}
#endif /* CONFIG_PPC_PMAC */
	case IOC_NVRAM_SYNC:
		nvram_sync();
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

struct file_operations nvram_fops = {
	.owner		= THIS_MODULE,
	.llseek		= nvram_llseek,
	.read		= read_nvram,
	.write		= write_nvram,
	.ioctl		= nvram_ioctl,
};

static struct miscdevice nvram_dev = {
	NVRAM_MINOR,
	"nvram",
	&nvram_fops
};

int __init nvram_init(void)
{
	printk(KERN_INFO "Macintosh non-volatile memory driver v%s\n",
		NVRAM_VERSION);
	return misc_register(&nvram_dev);
}

void __exit nvram_cleanup(void)
{
        misc_deregister( &nvram_dev );
}

module_init(nvram_init);
module_exit(nvram_cleanup);
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Generic /dev/nvram driver for architectures providing some
	3	* "generic" hooks, that is :
	4	*
	5	* nvram_read_byte, nvram_write_byte, nvram_sync
	6	*
	7	* Note that an additional hook is supported for PowerMac only
	8	* for getting the nvram "partition" informations
	9	*
	10	*/
	11
	12	#define NVRAM_VERSION "1.1"
	13
	14	#include <linux/module.h>
	15
	16	#include <linux/types.h>
	17	#include <linux/errno.h>
	18	#include <linux/fs.h>
	19	#include <linux/miscdevice.h>
	20	#include <linux/fcntl.h>
	21	#include <linux/init.h>
	22	#include <linux/smp_lock.h>
	23	#include <asm/uaccess.h>
	24	#include <asm/nvram.h>
e8222502 BH	25	#ifdef CONFIG_PPC_PMAC
	26	#include <asm/machdep.h>
	27	#endif
1da177e4 LT	28
	29	#define NVRAM_SIZE 8192
	30
	31	static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
	32	{
	33	lock_kernel();
	34	switch (origin) {
	35	case 1:
	36	offset += file->f_pos;
	37	break;
	38	case 2:
	39	offset += NVRAM_SIZE;
	40	break;
	41	}
	42	if (offset < 0) {
	43	unlock_kernel();
	44	return -EINVAL;
	45	}
	46	file->f_pos = offset;
	47	unlock_kernel();
	48	return file->f_pos;
	49	}
	50
	51	static ssize_t read_nvram(struct file file, char __user buf,
	52	size_t count, loff_t *ppos)
	53	{
	54	unsigned int i;
	55	char __user *p = buf;
	56
	57	if (!access_ok(VERIFY_WRITE, buf, count))
	58	return -EFAULT;
	59	if (*ppos >= NVRAM_SIZE)
	60	return 0;
	61	for (i = *ppos; count > 0 && i < NVRAM_SIZE; ++i, ++p, --count)
	62	if (__put_user(nvram_read_byte(i), p))
	63	return -EFAULT;
	64	*ppos = i;
	65	return p - buf;
	66	}
	67
	68	static ssize_t write_nvram(struct file file, const char __user buf,
	69	size_t count, loff_t *ppos)
	70	{
	71	unsigned int i;
	72	const char __user *p = buf;
	73	char c;
	74
	75	if (!access_ok(VERIFY_READ, buf, count))
	76	return -EFAULT;
	77	if (*ppos >= NVRAM_SIZE)
	78	return 0;
	79	for (i = *ppos; count > 0 && i < NVRAM_SIZE; ++i, ++p, --count) {
	80	if (__get_user(c, p))
	81	return -EFAULT;
	82	nvram_write_byte(c, i);
	83	}
	84	*ppos = i;
	85	return p - buf;
	86	}
	87
	88	static int nvram_ioctl(struct inode inode, struct file file,
	89	unsigned int cmd, unsigned long arg)
	90	{
	91	switch(cmd) {
92	#ifdef CONFIG_PPC_PMAC
93	case OBSOLETE_PMAC_NVRAM_GET_OFFSET:
94	printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n");
95	case IOC_NVRAM_GET_OFFSET: {
96	int part, offset;
97
e8222502	98	if (!machine_is(powermac))
1da177e4 LT	99	return -EINVAL;
	100	if (copy_from_user(&part, (void __user*)arg, sizeof(part)) != 0)
	101	return -EFAULT;
	102	if (part < pmac_nvram_OF \|\| part > pmac_nvram_NR)
	103	return -EINVAL;
	104	offset = pmac_get_partition(part);
	105	if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0)
	106	return -EFAULT;
	107	break;
	108	}
	109	#endif /* CONFIG_PPC_PMAC */
	110	case IOC_NVRAM_SYNC:
	111	nvram_sync();
	112	break;
	113	default:
	114	return -EINVAL;
	115	}
	116
	117	return 0;
	118	}
	119
	120	struct file_operations nvram_fops = {
	121	.owner = THIS_MODULE,
	122	.llseek = nvram_llseek,
	123	.read = read_nvram,
	124	.write = write_nvram,
	125	.ioctl = nvram_ioctl,
	126	};
	127
	128	static struct miscdevice nvram_dev = {
	129	NVRAM_MINOR,
	130	"nvram",
	131	&nvram_fops
	132	};
	133
	134	int __init nvram_init(void)
	135	{
	136	printk(KERN_INFO "Macintosh non-volatile memory driver v%s\n",
	137	NVRAM_VERSION);
	138	return misc_register(&nvram_dev);
	139	}
	140
	141	void __exit nvram_cleanup(void)
	142	{
	143	misc_deregister( &nvram_dev );
	144	}
	145
	146	module_init(nvram_init);
	147	module_exit(nvram_cleanup);
	148	MODULE_LICENSE("GPL");