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    Subject[PATCH 5/7] [RFC] ds2760 W1 slave
    This is W1 slave for ds2760 chip, found inside almost every HP iPaq and
    HTC PDAs/phones.

    ---
    drivers/w1/slaves/Kconfig | 13 +++
    drivers/w1/slaves/Makefile | 1 +
    drivers/w1/slaves/w1_ds2760.c | 162 +++++++++++++++++++++++++++++++++++++++++
    drivers/w1/slaves/w1_ds2760.h | 52 +++++++++++++
    drivers/w1/w1_family.h | 1 +
    5 files changed, 229 insertions(+), 0 deletions(-)
    create mode 100644 drivers/w1/slaves/w1_ds2760.c
    create mode 100644 drivers/w1/slaves/w1_ds2760.h

    diff --git a/drivers/w1/slaves/Kconfig b/drivers/w1/slaves/Kconfig
    index 904e5ae..df95d6c 100644
    --- a/drivers/w1/slaves/Kconfig
    +++ b/drivers/w1/slaves/Kconfig
    @@ -35,4 +35,17 @@ config W1_SLAVE_DS2433_CRC
    Each block has 30 bytes of data and a two byte CRC16.
    Full block writes are only allowed if the CRC is valid.

    +config W1_SLAVE_DS2760
    + tristate "Dallas 2760 battery monitor chip (HP iPAQ & others)"
    + depends on W1
    + help
    + If you enable this you will have the DS2760 battery monitor
    + chip support.
    +
    + The battery monitor chip is used in many batteries/devices
    + as the one who is responsible for charging/discharging/monitoring
    + Li+ batteries.
    +
    + If you are unsure, say N.
    +
    endmenu
    diff --git a/drivers/w1/slaves/Makefile b/drivers/w1/slaves/Makefile
    index 725dcfd..a8eb752 100644
    --- a/drivers/w1/slaves/Makefile
    +++ b/drivers/w1/slaves/Makefile
    @@ -5,4 +5,5 @@
    obj-$(CONFIG_W1_SLAVE_THERM) += w1_therm.o
    obj-$(CONFIG_W1_SLAVE_SMEM) += w1_smem.o
    obj-$(CONFIG_W1_SLAVE_DS2433) += w1_ds2433.o
    +obj-$(CONFIG_W1_SLAVE_DS2760) += w1_ds2760.o

    diff --git a/drivers/w1/slaves/w1_ds2760.c b/drivers/w1/slaves/w1_ds2760.c
    new file mode 100644
    index 0000000..21b0ef6
    --- /dev/null
    +++ b/drivers/w1/slaves/w1_ds2760.c
    @@ -0,0 +1,162 @@
    +/*
    + * 1-Wire implementation for the ds2760 chip
    + *
    + * Copyright (c) 2004-2005, Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
    + *
    + * Use consistent with the GNU GPL is permitted,
    + * provided that this copyright notice is
    + * preserved in its entirety in all copies and derived works.
    + *
    + */
    +
    +#include <asm/types.h>
    +
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/moduleparam.h>
    +#include <linux/device.h>
    +#include <linux/types.h>
    +#include <linux/jiffies.h>
    +
    +#include "../w1.h"
    +#include "../w1_int.h"
    +#include "../w1_family.h"
    +#include "w1_ds2760.h"
    +
    +static int w1_ds2760_io(struct device *dev, char *buf, int addr, size_t count,
    + int io)
    +{
    + struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
    +
    + if (!dev)
    + return 0;
    +
    + mutex_lock(&sl->master->mutex);
    +
    + if (addr > DS2760_DATA_SIZE || addr < 0) {
    + count = 0;
    + goto out;
    + }
    + if (addr + count > DS2760_DATA_SIZE)
    + count = DS2760_DATA_SIZE - addr;
    +
    + if (!w1_reset_select_slave(sl)) {
    + if (!io) {
    + w1_write_8(sl->master, W1_DS2760_READ_DATA);
    + w1_write_8(sl->master, addr);
    + count = w1_read_block(sl->master, buf, count);
    + } else {
    + w1_write_8(sl->master, W1_DS2760_WRITE_DATA);
    + w1_write_8(sl->master, addr);
    + w1_write_block(sl->master, buf, count);
    + /* XXX w1_write_block returns void, not n_written */
    + }
    + }
    +
    +out:
    + mutex_unlock(&sl->master->mutex);
    +
    + return count;
    +}
    +
    +int w1_ds2760_read(struct device *dev, char *buf, int addr, size_t count)
    +{
    + return w1_ds2760_io(dev, buf, addr, count, 0);
    +}
    +
    +int w1_ds2760_write(struct device *dev, char *buf, int addr, size_t count)
    +{
    + return w1_ds2760_io(dev, buf, addr, count, 1);
    +}
    +
    +/* io = 0 means copy from EEPROM to SRAM, 1 means from SRAM to EEPROM */
    +static int w1_ds2760_eeprom(struct device *dev, int addr, int io)
    +{
    + struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
    + int ret = 0;
    +
    + mutex_lock(&sl->master->mutex);
    +
    + if (!w1_reset_select_slave(sl)) {
    + if (!io)
    + w1_write_8(sl->master, W1_DS2760_RECALL_DATA);
    + else
    + w1_write_8(sl->master, W1_DS2760_COPY_DATA);
    + w1_write_8(sl->master, addr);
    + }
    +
    + mutex_unlock(&sl->master->mutex);
    +
    + return ret;
    +}
    +
    +int w1_ds2760_recall(struct device *dev, int addr)
    +{
    + return w1_ds2760_eeprom(dev, addr, 0);
    +}
    +
    +int w1_ds2760_copy(struct device *dev, int addr)
    +{
    + return w1_ds2760_eeprom(dev, addr, 1);
    +}
    +
    +static ssize_t w1_ds2760_read_bin(struct kobject *kobj, char *buf, loff_t off,
    + size_t count)
    +{
    + struct device *dev = container_of(kobj, struct device, kobj);
    + return w1_ds2760_read(dev, buf, off, count);
    +}
    +
    +static struct bin_attribute w1_ds2760_bin_attr = {
    + .attr = {
    + .name = "w1_slave",
    + .mode = S_IRUGO,
    + .owner = THIS_MODULE,
    + },
    + .size = DS2760_DATA_SIZE,
    + .read = w1_ds2760_read_bin,
    +};
    +
    +static int w1_ds2760_add_slave(struct w1_slave *sl)
    +{
    + return sysfs_create_bin_file(&sl->dev.kobj, &w1_ds2760_bin_attr);
    +}
    +
    +static void w1_ds2760_remove_slave(struct w1_slave *sl)
    +{
    + sysfs_remove_bin_file(&sl->dev.kobj, &w1_ds2760_bin_attr);
    +}
    +
    +static struct w1_family_ops w1_ds2760_fops = {
    + .add_slave = w1_ds2760_add_slave,
    + .remove_slave = w1_ds2760_remove_slave,
    +};
    +
    +static struct w1_family w1_ds2760_family = {
    + .fid = W1_FAMILY_DS2760,
    + .fops = &w1_ds2760_fops,
    +};
    +
    +static int __init w1_ds2760_init(void)
    +{
    + printk("1-Wire driver for the DS2760 battery monitor chip "
    + " - (c) 2004-2005, Szabolcs Gyurko\n");
    + return w1_register_family(&w1_ds2760_family);
    +}
    +
    +static void __exit w1_ds2760_exit(void)
    +{
    + w1_unregister_family(&w1_ds2760_family);
    +}
    +
    +EXPORT_SYMBOL(w1_ds2760_read);
    +EXPORT_SYMBOL(w1_ds2760_write);
    +EXPORT_SYMBOL(w1_ds2760_recall);
    +EXPORT_SYMBOL(w1_ds2760_copy);
    +
    +module_init(w1_ds2760_init);
    +module_exit(w1_ds2760_exit);
    +
    +MODULE_LICENSE("GPL");
    +MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>");
    +MODULE_DESCRIPTION("1-wire Driver Dallas 2760 battery monitor chip");
    diff --git a/drivers/w1/slaves/w1_ds2760.h b/drivers/w1/slaves/w1_ds2760.h
    new file mode 100644
    index 0000000..301aae4
    --- /dev/null
    +++ b/drivers/w1/slaves/w1_ds2760.h
    @@ -0,0 +1,52 @@
    +/*
    + * 1-Wire implementation for the ds2760 chip
    + *
    + * Copyright (c) 2004-2005, Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
    + *
    + * Use consistent with the GNU GPL is permitted,
    + * provided that this copyright notice is
    + * preserved in its entirety in all copies and derived works.
    + *
    + */
    +
    +#ifndef __w1_ds2760_h__
    +#define __w1_ds2760_h__
    +
    +/* Known commands to the DS2760 chip */
    +#define W1_DS2760_SWAP 0xAA
    +#define W1_DS2760_READ_DATA 0x69
    +#define W1_DS2760_WRITE_DATA 0x6C
    +#define W1_DS2760_COPY_DATA 0x48
    +#define W1_DS2760_RECALL_DATA 0xB8
    +#define W1_DS2760_LOCK 0x6A
    +
    +/* Number of valid register addresses */
    +#define DS2760_DATA_SIZE 0x40
    +
    +#define DS2760_PROTECTION_REG 0x00
    +#define DS2760_STATUS_REG 0x01
    +#define DS2760_EEPROM_REG 0x07
    +#define DS2760_SPECIAL_FEATURE_REG 0x08
    +#define DS2760_VOLTAGE_MSB 0x0c
    +#define DS2760_VOLTAGE_LSB 0x0d
    +#define DS2760_CURRENT_MSB 0x0e
    +#define DS2760_CURRENT_LSB 0x0f
    +#define DS2760_CURRENT_ACCUM_MSB 0x10
    +#define DS2760_CURRENT_ACCUM_LSB 0x11
    +#define DS2760_TEMP_MSB 0x18
    +#define DS2760_TEMP_LSB 0x19
    +#define DS2760_EEPROM_BLOCK0 0x20
    +#define DS2760_ACTIVE_FULL 0x20
    +#define DS2760_EEPROM_BLOCK1 0x30
    +#define DS2760_RATED_CAPACITY 0x32
    +#define DS2760_CURRENT_OFFSET_BIAS 0x33
    +#define DS2760_ACTIVE_EMPTY 0x3b
    +
    +extern int w1_ds2760_read(struct device *dev, char *buf, int addr,
    + size_t count);
    +extern int w1_ds2760_write(struct device *dev, char *buf, int addr,
    + size_t count);
    +extern int w1_ds2760_recall(struct device *dev, int addr);
    +extern int w1_ds2760_copy(struct device *dev, int addr);
    +
    +#endif /* !__w1_ds2760_h__ */
    diff --git a/drivers/w1/w1_family.h b/drivers/w1/w1_family.h
    index 1e2ac40..ef1e1da 100644
    --- a/drivers/w1/w1_family.h
    +++ b/drivers/w1/w1_family.h
    @@ -33,6 +33,7 @@
    #define W1_THERM_DS1822 0x22
    #define W1_EEPROM_DS2433 0x23
    #define W1_THERM_DS18B20 0x28
    +#define W1_FAMILY_DS2760 0x30

    #define MAXNAMELEN 32

    --
    1.5.0.5-dirty
    -
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