Revert "w1: Add 1-wire slave device driver for DS28E04-100"

This reverts commit f19420c1acb0b573c88a12deb2d42035e22d4a17.

It contained lots of errors and warnings and shouldn't have ever been
applied, that was my fault, sorry.

Cc: Markus Franke <markus.franke@s2002.tu-chemnitz.de>
Cc: Evgeniy Polyakov <zbr@ioremap.net>,
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 0 insertions, 472 deletions

diff --git a/drivers/w1/slaves/Kconfig b/drivers/w1/slaves/Kconfig
index 605ee36c96f..eb9e376d624 100644
--- a/drivers/w1/slaves/Kconfig
+++ b/drivers/w1/slaves/Kconfig
@@ -94,13 +94,6 @@ config W1_SLAVE_DS2781
 
 	  If you are unsure, say N.
 
-config W1_SLAVE_DS28E04
-	tristate "4096-Bit Addressable 1-Wire EEPROM with PIO (DS28E04-100)"
-	depends on W1
-	help
-	  Say Y here if you want to use a 1-wire
-	  4kb EEPROM with PIO family device (DS28E04).
-
 config W1_SLAVE_BQ27000
 	tristate "BQ27000 slave support"
 	depends on W1
diff --git a/drivers/w1/slaves/Makefile b/drivers/w1/slaves/Makefile
index 05188f6aab5..c4f1859fb52 100644
--- a/drivers/w1/slaves/Makefile
+++ b/drivers/w1/slaves/Makefile
@@ -12,4 +12,3 @@ obj-$(CONFIG_W1_SLAVE_DS2760)	+= w1_ds2760.o
 obj-$(CONFIG_W1_SLAVE_DS2780)	+= w1_ds2780.o
 obj-$(CONFIG_W1_SLAVE_DS2781)	+= w1_ds2781.o
 obj-$(CONFIG_W1_SLAVE_BQ27000)	+= w1_bq27000.o
-obj-$(CONFIG_W1_SLAVE_DS28E04)	+= w1_ds28e04.o
diff --git a/drivers/w1/slaves/w1_ds28e04.c b/drivers/w1/slaves/w1_ds28e04.c
deleted file mode 100644
index 4aa1aa90480..00000000000
--- a/drivers/w1/slaves/w1_ds28e04.c
+++ /dev/null
@@ -1,464 +0,0 @@
-/*
- *	w1_ds28e04.c - w1 family 1C (DS28E04) driver
- *
- * Copyright (c) 2012 Markus Franke <franke.m@sebakmt.com>
- *
- * This source code is licensed under the GNU General Public License,
- * Version 2. See the file COPYING for more details.
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/device.h>
-#include <linux/types.h>
-#include <linux/delay.h>
-#include <linux/slab.h>
-#include <linux/crc16.h>
-#include <linux/uaccess.h>
-
-#define CRC16_INIT		0
-#define CRC16_VALID		0xb001
-
-#include "../w1.h"
-#include "../w1_int.h"
-#include "../w1_family.h"
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Markus Franke <franke.m@sebakmt.com>, <franm@hrz.tu-chemnitz.de>");
-MODULE_DESCRIPTION("w1 family 1C driver for DS28E04, 4kb EEPROM and PIO");
-
-/* Allow the strong pullup to be disabled, but default to enabled.
- * If it was disabled a parasite powered device might not get the required
- * current to copy the data from the scratchpad to EEPROM.  If it is enabled parasite powered
- * devices have a better chance of getting the current required.
- */
-static int w1_strong_pullup = 1;
-module_param_named(strong_pullup, w1_strong_pullup, int, 0);
-
-/* enable/disable CRC checking on DS28E04-100 memory accesses */
-static char w1_enable_crccheck = 1;
-
-#define W1_EEPROM_SIZE		512
-#define W1_PAGE_COUNT		16
-#define W1_PAGE_SIZE		32
-#define W1_PAGE_BITS		5
-#define W1_PAGE_MASK		0x1F
-
-#define W1_F1C_READ_EEPROM	0xF0
-#define W1_F1C_WRITE_SCRATCH	0x0F
-#define W1_F1C_READ_SCRATCH	0xAA
-#define W1_F1C_COPY_SCRATCH	0x55
-#define W1_F1C_ACCESS_WRITE	0x5A
-
-#define W1_1C_REG_LOGIC_STATE	0x220
-
-struct w1_f1C_data {
-	u8	memory[W1_EEPROM_SIZE];
-	u32	validcrc;
-};
-
-/**
- * Check the file size bounds and adjusts count as needed.
- * This would not be needed if the file size didn't reset to 0 after a write.
- */
-static inline size_t w1_f1C_fix_count(loff_t off, size_t count, size_t size)
-{
-	if (off > size)
-		return 0;
-
-	if ((off + count) > size)
-		return (size - off);
-
-	return count;
-}
-
-static int w1_f1C_refresh_block(struct w1_slave *sl, struct w1_f1C_data *data,
-				int block)
-{
-	u8	wrbuf[3];
-	int	off = block * W1_PAGE_SIZE;
-
-	if (data->validcrc & (1 << block))
-		return 0;
-
-	if (w1_reset_select_slave(sl)) {
-		data->validcrc = 0;
-		return -EIO;
-	}
-
-	wrbuf[0] = W1_F1C_READ_EEPROM;
-	wrbuf[1] = off & 0xff;
-	wrbuf[2] = off >> 8;
-	w1_write_block(sl->master, wrbuf, 3);
-	w1_read_block(sl->master, &data->memory[off], W1_PAGE_SIZE);
-
-	/* cache the block if the CRC is valid */
-	if (crc16(CRC16_INIT, &data->memory[off], W1_PAGE_SIZE) == CRC16_VALID)
-		data->validcrc |= (1 << block);
-
-	return 0;
-}
-
-static int w1_f1C_read(struct w1_slave *sl, int addr, int len, char *data)
-{
-	u8 wrbuf[3];
-
-	/* read directly from the EEPROM */
-	if (w1_reset_select_slave(sl))
-		return -EIO;
-
-	wrbuf[0] = W1_F1C_READ_EEPROM;
-	wrbuf[1] = addr & 0xff;
-	wrbuf[2] = addr >> 8;
-	
-	w1_write_block(sl->master, wrbuf, sizeof(wrbuf));
-	return w1_read_block(sl->master, data, len);
-}
-
-static ssize_t w1_f1C_read_bin(struct file *filp, struct kobject *kobj, 
-			       struct bin_attribute *bin_attr,			       
-			       char *buf, loff_t off, size_t count)
-{
-	struct w1_slave *sl = kobj_to_w1_slave(kobj);
-	struct w1_f1C_data *data = sl->family_data;
-	int i, min_page, max_page;
-
-	if ((count = w1_f1C_fix_count(off, count, W1_EEPROM_SIZE)) == 0)
-		return 0;
-
-	mutex_lock(&sl->master->mutex);
-
-	if(w1_enable_crccheck) {
-		min_page = (off >> W1_PAGE_BITS);
-		max_page = (off + count - 1) >> W1_PAGE_BITS;
-		for (i = min_page; i <= max_page; i++) {
-			if (w1_f1C_refresh_block(sl, data, i)) {
-				count = -EIO;
-				goto out_up;
-			}
-		}
-		memcpy(buf, &data->memory[off], count);
-	}
-	else {
-		count = w1_f1C_read(sl, off, count, buf);
-	}
-
-out_up:
-	mutex_unlock(&sl->master->mutex);
-
-	return count;
-}
-
-/**
- * Writes to the scratchpad and reads it back for verification.
- * Then copies the scratchpad to EEPROM.
- * The data must be on one page.
- * The master must be locked.
- *
- * @param sl	The slave structure
- * @param addr	Address for the write
- * @param len   length must be <= (W1_PAGE_SIZE - (addr & W1_PAGE_MASK))
- * @param data	The data to write
- * @return	0=Success -1=failure
- */
-static int w1_f1C_write(struct w1_slave *sl, int addr, int len, const u8 *data)
-{
-	u8 wrbuf[4];
-	u8 rdbuf[W1_PAGE_SIZE + 3];
-	u8 es = (addr + len - 1) & 0x1f;
-	unsigned int tm = 10;
-	int i;
-	struct w1_f1C_data *f1C = sl->family_data;
-
-	/* Write the data to the scratchpad */
-	if (w1_reset_select_slave(sl))
-		return -1;
-
-	wrbuf[0] = W1_F1C_WRITE_SCRATCH;
-	wrbuf[1] = addr & 0xff;
-	wrbuf[2] = addr >> 8;
-
-	w1_write_block(sl->master, wrbuf, 3);
-	w1_write_block(sl->master, data, len);
-
-	/* Read the scratchpad and verify */
-	if (w1_reset_select_slave(sl))
-		return -1;
-
-	w1_write_8(sl->master, W1_F1C_READ_SCRATCH);
-	w1_read_block(sl->master, rdbuf, len + 3);
-
-	/* Compare what was read against the data written */
-	if ((rdbuf[0] != wrbuf[1]) || (rdbuf[1] != wrbuf[2]) ||
-	    (rdbuf[2] != es) || (memcmp(data, &rdbuf[3], len) != 0))
-		return -1;
-
-	/* Copy the scratchpad to EEPROM */
-	if (w1_reset_select_slave(sl))
-		return -1;
-
-	wrbuf[0] = W1_F1C_COPY_SCRATCH;
-	wrbuf[3] = es;
-
-	for(i = 0; i < sizeof(wrbuf); ++i) {
-		/* issue 10ms strong pullup (or delay) on the last byte for writing the data from the scratchpad to EEPROM */
-		if(w1_strong_pullup && i == sizeof(wrbuf)-1)
-			w1_next_pullup(sl->master, tm);
-		
-		w1_write_8(sl->master, wrbuf[i]);
-	}
-
-	if(!w1_strong_pullup)
-		msleep(tm);
-
-	if(w1_enable_crccheck) {
-		/* invalidate cached data */
-		f1C->validcrc &= ~(1 << (addr >> W1_PAGE_BITS));
-	}
-
-	/* Reset the bus to wake up the EEPROM (this may not be needed) */
-	w1_reset_bus(sl->master);
-
-	return 0;
-}
-
-static ssize_t w1_f1C_write_bin(struct file *filp, struct kobject *kobj, 
-			       struct bin_attribute *bin_attr,			       
-			       char *buf, loff_t off, size_t count)
-
-{
-	struct w1_slave *sl = kobj_to_w1_slave(kobj);
-	int addr, len, idx;
-
-	if ((count = w1_f1C_fix_count(off, count, W1_EEPROM_SIZE)) == 0)
-		return 0;
-
-	if(w1_enable_crccheck) {
-		/* can only write full blocks in cached mode */
-		if ((off & W1_PAGE_MASK) || (count & W1_PAGE_MASK)) {
-			dev_err(&sl->dev, "invalid offset/count off=%d cnt=%zd\n",
-				(int)off, count);
-			return -EINVAL;
-		}
-
-		/* make sure the block CRCs are valid */
-		for (idx = 0; idx < count; idx += W1_PAGE_SIZE) {
-			if (crc16(CRC16_INIT, &buf[idx], W1_PAGE_SIZE) != CRC16_VALID) {
-				dev_err(&sl->dev, "bad CRC at offset %d\n", (int)off);
-				return -EINVAL;
-			}
-		}
-	}
-
-	mutex_lock(&sl->master->mutex);
-
-	/* Can only write data to one page at a time */
-	idx = 0;
-	while (idx < count) {
-		addr = off + idx;
-		len = W1_PAGE_SIZE - (addr & W1_PAGE_MASK);
-		if (len > (count - idx))
-			len = count - idx;
-
-		if (w1_f1C_write(sl, addr, len, &buf[idx]) < 0) {
-			count = -EIO;
-			goto out_up;
-		}
-		idx += len;
-	}
-
-out_up:
-	mutex_unlock(&sl->master->mutex);
-
-	return count;
-}
-
-static ssize_t w1_f1C_read_pio(struct file *filp, struct kobject *kobj,
-                               struct bin_attribute *bin_attr,
-                               char *buf, loff_t off, size_t count)
-
-{
-	struct w1_slave *sl = kobj_to_w1_slave(kobj);
-	int ret;
-
-	/* check arguments */
-	if(off != 0 || count != 1 || buf == NULL)
-     		return -EINVAL;
-
-	mutex_lock(&sl->master->mutex);
-	ret = w1_f1C_read(sl, W1_1C_REG_LOGIC_STATE, count, buf);
-	mutex_unlock(&sl->master->mutex);
-
-	return ret;
-}
-
-static ssize_t w1_f1C_write_pio(struct file *filp, struct kobject *kobj,
-                               struct bin_attribute *bin_attr,
-                               char *buf, loff_t off, size_t count)
-
-{
-	struct w1_slave *sl = kobj_to_w1_slave(kobj);
-	u8 wrbuf[3];
-	u8 ack;
-
-	/* check arguments */
-	if(off != 0 || count != 1 || buf == NULL)
-     		return -EINVAL;
-
-	mutex_lock(&sl->master->mutex);
-
-	/* Write the PIO data */
-	if (w1_reset_select_slave(sl)) {
-		mutex_unlock(&sl->master->mutex);
-		return -1;
-	}
-
-	/* set bit 7..2 to value '1' */
-	*buf = *buf | 0xFC;
-
-	wrbuf[0] = W1_F1C_ACCESS_WRITE;
-	wrbuf[1] = *buf;
-	wrbuf[2] = ~(*buf);
-	w1_write_block(sl->master, wrbuf, 3);
-
-	w1_read_block(sl->master, &ack, sizeof(ack));
-
-	mutex_unlock(&sl->master->mutex);
-
-	/* check for acknowledgement */
-	if(ack != 0xAA) return -EIO;
-
-	return count;
-}
-
-static ssize_t w1_f1C_show_crccheck(struct device *dev, struct device_attribute *attr,	
-                               char *buf)
-{
-	if(put_user(w1_enable_crccheck + 0x30, buf))
-		return -EFAULT;
-	
-	return sizeof(w1_enable_crccheck);
-}
-
-static ssize_t w1_f1C_store_crccheck(struct device *dev, struct device_attribute *attr,	
-                               const char *buf, size_t count)
-{
-	char val;
-	
-	if(count != 1 || !buf) return -EINVAL;
-
-	if(get_user(val, buf))
-		return -EFAULT;
-	
-	/* convert to decimal */
-	val = val - 0x30;
-	if(val != 0 && val != 1) return -EINVAL;
-
-	/* set the new value */
-	w1_enable_crccheck = val;
-
-	return sizeof(w1_enable_crccheck);
-}
-
-#define NB_SYSFS_BIN_FILES 2
-static struct bin_attribute w1_f1C_bin_attr[NB_SYSFS_BIN_FILES] = {
-	{
-		.attr = {
-			.name = "eeprom",
-			.mode = S_IRUGO | S_IWUSR,
-		},
-		.size = W1_EEPROM_SIZE,
-		.read = w1_f1C_read_bin,
-		.write = w1_f1C_write_bin,
-	},
-	{
-		.attr = {
-			.name = "pio",
-			.mode = S_IRUGO | S_IWUSR,
-		},
-		.size = 1,
-		.read = w1_f1C_read_pio,
-		.write = w1_f1C_write_pio,
-	}
-};
-
-static DEVICE_ATTR(crccheck, S_IWUSR | S_IRUGO, w1_f1C_show_crccheck, w1_f1C_store_crccheck);
-
-static int w1_f1C_add_slave(struct w1_slave *sl)
-{
-	int err = 0;
-	int i;
-	struct w1_f1C_data *data = NULL;
-
-	if(w1_enable_crccheck) {
-		data = kzalloc(sizeof(struct w1_f1C_data), GFP_KERNEL);
-		if (!data)
-			return -ENOMEM;
-		sl->family_data = data;
-	}
-
-	/* create binary sysfs attributes */
-	for (i = 0; i < NB_SYSFS_BIN_FILES && !err; ++i)
-		err = sysfs_create_bin_file(&sl->dev.kobj, &(w1_f1C_bin_attr[i]));
-
-	if(err)
-		goto out;
-
-	/* create device attributes */
-	err = device_create_file(&sl->dev, &dev_attr_crccheck);	
-
-	if(err)	{
-		/* remove binary sysfs attributes */
-		for (i = 0; i < NB_SYSFS_BIN_FILES; ++i)
-			sysfs_remove_bin_file(&sl->dev.kobj, &(w1_f1C_bin_attr[i]));
-	}
-
-out:
-	if(err) {
-		if(w1_enable_crccheck)
-			kfree(data);
-	}
-
-	return err;
-}
-
-static void w1_f1C_remove_slave(struct w1_slave *sl)
-{
-	int i;
-
-	if(w1_enable_crccheck) {
-		kfree(sl->family_data);
-		sl->family_data = NULL;
-	}
-
-	/* remove device attributes */
-	device_remove_file(&sl->dev, &dev_attr_crccheck);
-
-	/* remove binary sysfs attributes */
-	for (i = 0; i < NB_SYSFS_BIN_FILES; ++i)
-		sysfs_remove_bin_file(&sl->dev.kobj, &(w1_f1C_bin_attr[i]));
-}
-
-static struct w1_family_ops w1_f1C_fops = {
-	.add_slave      = w1_f1C_add_slave,
-	.remove_slave   = w1_f1C_remove_slave,
-};
-
-static struct w1_family w1_family_1C = {
-	.fid = W1_FAMILY_DS28E04,
-	.fops = &w1_f1C_fops,
-};
-
-static int __init w1_f1C_init(void)
-{
-	return w1_register_family(&w1_family_1C);
-}
-
-static void __exit w1_f1C_fini(void)
-{
-	w1_unregister_family(&w1_family_1C);
-}
-
-module_init(w1_f1C_init);
-module_exit(w1_f1C_fini);