[mirror_ubuntu-artful-kernel.git] / drivers / mtd / chips / map_rom.c

/*
 * Common code to handle map devices which are simple ROM
 * (C) 2000 Red Hat. GPL'd.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/compatmac.h>

static int maprom_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int maprom_write (struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
static void maprom_nop (struct mtd_info *);
static struct mtd_info *map_rom_probe(struct map_info *map);

static struct mtd_chip_driver maprom_chipdrv = {
	.probe	= map_rom_probe,
	.name	= "map_rom",
	.module	= THIS_MODULE
};

static struct mtd_info *map_rom_probe(struct map_info *map)
{
	struct mtd_info *mtd;

	mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
	if (!mtd)
		return NULL;

	map->fldrv = &maprom_chipdrv;
	mtd->priv = map;
	mtd->name = map->name;
	mtd->type = MTD_ROM;
	mtd->size = map->size;
	mtd->read = maprom_read;
	mtd->write = maprom_write;
	mtd->sync = maprom_nop;
	mtd->flags = MTD_CAP_ROM;
	mtd->erasesize = map->size;
	mtd->writesize = 1;

	__module_get(THIS_MODULE);
	return mtd;
}


static int maprom_read (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf)
{
	struct map_info *map = mtd->priv;

	map_copy_from(map, buf, from, len);
	*retlen = len;
	return 0;
}

static void maprom_nop(struct mtd_info *mtd)
{
	/* Nothing to see here */
}

static int maprom_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf)
{
	printk(KERN_NOTICE "maprom_write called\n");
	return -EIO;
}

static int __init map_rom_init(void)
{
	register_mtd_chip_driver(&maprom_chipdrv);
	return 0;
}

static void __exit map_rom_exit(void)
{
	unregister_mtd_chip_driver(&maprom_chipdrv);
}

module_init(map_rom_init);
module_exit(map_rom_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("MTD chip driver for ROM chips");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Common code to handle map devices which are simple ROM
	3	* (C) 2000 Red Hat. GPL'd.
1da177e4 LT	4	*/
	5
	6	#include <linux/module.h>
	7	#include <linux/types.h>
	8	#include <linux/kernel.h>
	9	#include <asm/io.h>
	10	#include <asm/byteorder.h>
	11	#include <linux/errno.h>
	12	#include <linux/slab.h>
	13	#include <linux/init.h>
	14	#include <linux/mtd/mtd.h>
	15	#include <linux/mtd/map.h>
	16	#include <linux/mtd/compatmac.h>
	17
	18	static int maprom_read (struct mtd_info , loff_t, size_t, size_t , u_char *);
	19	static int maprom_write (struct mtd_info , loff_t, size_t, size_t , const u_char *);
	20	static void maprom_nop (struct mtd_info *);
	21	static struct mtd_info map_rom_probe(struct map_info map);
	22
	23	static struct mtd_chip_driver maprom_chipdrv = {
	24	.probe = map_rom_probe,
	25	.name = "map_rom",
	26	.module = THIS_MODULE
	27	};
	28
	29	static struct mtd_info map_rom_probe(struct map_info map)
	30	{
	31	struct mtd_info *mtd;
	32
95b93a0c	33	mtd = kzalloc(sizeof(*mtd), GFP_KERNEL);
1da177e4 LT	34	if (!mtd)
	35	return NULL;
	36
1da177e4 LT	37	map->fldrv = &maprom_chipdrv;
	38	mtd->priv = map;
	39	mtd->name = map->name;
21c8db9e	40	mtd->type = MTD_ROM;
1da177e4 LT	41	mtd->size = map->size;
	42	mtd->read = maprom_read;
	43	mtd->write = maprom_write;
	44	mtd->sync = maprom_nop;
	45	mtd->flags = MTD_CAP_ROM;
e369d62e	46	mtd->erasesize = map->size;
17ffc7ba	47	mtd->writesize = 1;
1da177e4 LT	48
	49	__module_get(THIS_MODULE);
	50	return mtd;
	51	}
	52
	53
	54	static int maprom_read (struct mtd_info mtd, loff_t from, size_t len, size_t retlen, u_char *buf)
	55	{
	56	struct map_info *map = mtd->priv;
	57
	58	map_copy_from(map, buf, from, len);
	59	*retlen = len;
	60	return 0;
	61	}
	62
	63	static void maprom_nop(struct mtd_info *mtd)
	64	{
	65	/* Nothing to see here */
	66	}
	67
	68	static int maprom_write (struct mtd_info mtd, loff_t to, size_t len, size_t retlen, const u_char *buf)
	69	{
	70	printk(KERN_NOTICE "maprom_write called\n");
	71	return -EIO;
	72	}
	73
	74	static int __init map_rom_init(void)
	75	{
	76	register_mtd_chip_driver(&maprom_chipdrv);
	77	return 0;
	78	}
	79
	80	static void __exit map_rom_exit(void)
	81	{
	82	unregister_mtd_chip_driver(&maprom_chipdrv);
	83	}
	84
	85	module_init(map_rom_init);
	86	module_exit(map_rom_exit);
	87
	88	MODULE_LICENSE("GPL");
	89	MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
	90	MODULE_DESCRIPTION("MTD chip driver for ROM chips");