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DS2781 Maxim Stand-Alone Fuel Gauge battery and w1 slave drivers

Browse Source 
Signed-off-by: Renata Sayakhova <rsayakhova@gmail.com>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Renata Sayakhova 2012-02-29 14:58:53 +01:00 committed by Greg Kroah-Hartman
parent f6e8a1d7b4
commit fef37e9a47
8 changed files with 1241 additions and 0 deletions
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14
drivers/power/Kconfig
View File

@ -76,6 +76,20 @@ config BATTERY_DS2780
help
Say Y here to enable support for batteries with ds2780 chip.
config BATTERY_DS2781
tristate "2781 battery driver"
depends on HAS_IOMEM
select W1
select W1_SLAVE_DS2781
help
If you enable this you will have the DS2781 battery driver 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.
config BATTERY_DS2782
tristate "DS2782/DS2786 standalone gas-gauge"
depends on I2C

1
drivers/power/Makefile
View File

@ -16,6 +16,7 @@ obj-$(CONFIG_TEST_POWER) += test_power.o
obj-$(CONFIG_BATTERY_DS2760) += ds2760_battery.o
obj-$(CONFIG_BATTERY_DS2780) += ds2780_battery.o
obj-$(CONFIG_BATTERY_DS2781) += ds2781_battery.o
obj-$(CONFIG_BATTERY_DS2782) += ds2782_battery.o
obj-$(CONFIG_BATTERY_PMU) += pmu_battery.o
obj-$(CONFIG_BATTERY_OLPC) += olpc_battery.o

874
drivers/power/ds2781_battery.c Normal file
View File

@ -0,0 +1,874 @@
/*
* 1-wire client/driver for the Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC
*
* Author: Renata Sayakhova <renata@oktetlabs.ru>
*
* Based on ds2780_battery drivers
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/param.h>
#include <linux/pm.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/idr.h>
#include "../w1/w1.h"
#include "../w1/slaves/w1_ds2781.h"
/* Current unit measurement in uA for a 1 milli-ohm sense resistor */
#define DS2781_CURRENT_UNITS 1563
/* Charge unit measurement in uAh for a 1 milli-ohm sense resistor */
#define DS2781_CHARGE_UNITS 6250
/* Number of bytes in user EEPROM space */
#define DS2781_USER_EEPROM_SIZE (DS2781_EEPROM_BLOCK0_END - \
DS2781_EEPROM_BLOCK0_START + 1)
/* Number of bytes in parameter EEPROM space */
#define DS2781_PARAM_EEPROM_SIZE (DS2781_EEPROM_BLOCK1_END - \
DS2781_EEPROM_BLOCK1_START + 1)
struct ds2781_device_info {
struct device *dev;
struct power_supply bat;
struct device *w1_dev;
struct task_struct *mutex_holder;
};
enum current_types {
CURRENT_NOW,
CURRENT_AVG,
};
static const char model[] = "DS2781";
static const char manufacturer[] = "Maxim/Dallas";
static inline struct ds2781_device_info *
to_ds2781_device_info(struct power_supply *psy)
{
return container_of(psy, struct ds2781_device_info, bat);
}
static inline struct power_supply *to_power_supply(struct device *dev)
{
return dev_get_drvdata(dev);
}
static inline int ds2781_battery_io(struct ds2781_device_info *dev_info,
char *buf, int addr, size_t count, int io)
{
if (dev_info->mutex_holder == current)
return w1_ds2781_io_nolock(dev_info->w1_dev, buf, addr,
count, io);
else
return w1_ds2781_io(dev_info->w1_dev, buf, addr, count, io);
}
int w1_ds2781_read(struct ds2781_device_info *dev_info, char *buf,
int addr, size_t count)
{
return ds2781_battery_io(dev_info, buf, addr, count, 0);
}
static inline int ds2781_read8(struct ds2781_device_info *dev_info, u8 *val,
int addr)
{
return ds2781_battery_io(dev_info, val, addr, sizeof(u8), 0);
}
static int ds2781_read16(struct ds2781_device_info *dev_info, s16 *val,
int addr)
{
int ret;
u8 raw[2];
ret = ds2781_battery_io(dev_info, raw, addr, sizeof(raw), 0);
if (ret < 0)
return ret;
*val = (raw[0] << 8) | raw[1];
return 0;
}
static inline int ds2781_read_block(struct ds2781_device_info *dev_info,
u8 *val, int addr, size_t count)
{
return ds2781_battery_io(dev_info, val, addr, count, 0);
}
static inline int ds2781_write(struct ds2781_device_info *dev_info, u8 *val,
int addr, size_t count)
{
return ds2781_battery_io(dev_info, val, addr, count, 1);
}
static inline int ds2781_store_eeprom(struct device *dev, int addr)
{
return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_COPY_DATA);
}
static inline int ds2781_recall_eeprom(struct device *dev, int addr)
{
return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_RECALL_DATA);
}
static int ds2781_save_eeprom(struct ds2781_device_info *dev_info, int reg)
{
int ret;
ret = ds2781_store_eeprom(dev_info->w1_dev, reg);
if (ret < 0)
return ret;
ret = ds2781_recall_eeprom(dev_info->w1_dev, reg);
if (ret < 0)
return ret;
return 0;
}
/* Set sense resistor value in mhos */
static int ds2781_set_sense_register(struct ds2781_device_info *dev_info,
u8 conductance)
{
int ret;
ret = ds2781_write(dev_info, &conductance,
DS2781_RSNSP, sizeof(u8));
if (ret < 0)
return ret;
return ds2781_save_eeprom(dev_info, DS2781_RSNSP);
}
/* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */
static int ds2781_get_rsgain_register(struct ds2781_device_info *dev_info,
u16 *rsgain)
{
return ds2781_read16(dev_info, rsgain, DS2781_RSGAIN_MSB);
}
/* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */
static int ds2781_set_rsgain_register(struct ds2781_device_info *dev_info,
u16 rsgain)
{
int ret;
u8 raw[] = {rsgain >> 8, rsgain & 0xFF};
ret = ds2781_write(dev_info, raw,
DS2781_RSGAIN_MSB, sizeof(raw));
if (ret < 0)
return ret;
return ds2781_save_eeprom(dev_info, DS2781_RSGAIN_MSB);
}
static int ds2781_get_voltage(struct ds2781_device_info *dev_info,
int *voltage_uV)
{
int ret;
char val[2];
int voltage_raw;
ret = w1_ds2781_read(dev_info, val, DS2781_VOLT_MSB, 2 * sizeof(u8));
if (ret < 0)
return ret;
/*
* The voltage value is located in 10 bits across the voltage MSB
* and LSB registers in two's compliment form
* Sign bit of the voltage value is in bit 7 of the voltage MSB register
* Bits 9 - 3 of the voltage value are in bits 6 - 0 of the
* voltage MSB register
* Bits 2 - 0 of the voltage value are in bits 7 - 5 of the
* voltage LSB register
*/
voltage_raw = (val[0] << 3) |
(val[1] >> 5);
/* DS2781 reports voltage in units of 9.76mV, but the battery class
* reports in units of uV, so convert by multiplying by 9760. */
*voltage_uV = voltage_raw * 9760;
return 0;
}
static int ds2781_get_temperature(struct ds2781_device_info *dev_info,
int *temp)
{
int ret;
char val[2];
int temp_raw;
ret = w1_ds2781_read(dev_info, val, DS2781_TEMP_MSB, 2 * sizeof(u8));
if (ret < 0)
return ret;
/*
* The temperature value is located in 10 bits across the temperature
* MSB and LSB registers in two's compliment form
* Sign bit of the temperature value is in bit 7 of the temperature
* MSB register
* Bits 9 - 3 of the temperature value are in bits 6 - 0 of the
* temperature MSB register
* Bits 2 - 0 of the temperature value are in bits 7 - 5 of the
* temperature LSB register
*/
temp_raw = ((val[0]) << 3) |
(val[1] >> 5);
*temp = temp_raw + (temp_raw / 4);
return 0;
}
static int ds2781_get_current(struct ds2781_device_info *dev_info,
enum current_types type, int *current_uA)
{
int ret, sense_res;
s16 current_raw;
u8 sense_res_raw, reg_msb;
/*
* The units of measurement for current are dependent on the value of
* the sense resistor.
*/
ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);
if (ret < 0)
return ret;
if (sense_res_raw == 0) {
dev_err(dev_info->dev, "sense resistor value is 0\n");
return -EINVAL;
}
sense_res = 1000 / sense_res_raw;
if (type == CURRENT_NOW)
reg_msb = DS2781_CURRENT_MSB;
else if (type == CURRENT_AVG)
reg_msb = DS2781_IAVG_MSB;
else
return -EINVAL;
/*
* The current value is located in 16 bits across the current MSB
* and LSB registers in two's compliment form
* Sign bit of the current value is in bit 7 of the current MSB register
* Bits 14 - 8 of the current value are in bits 6 - 0 of the current
* MSB register
* Bits 7 - 0 of the current value are in bits 7 - 0 of the current
* LSB register
*/
ret = ds2781_read16(dev_info, &current_raw, reg_msb);
if (ret < 0)
return ret;
*current_uA = current_raw * (DS2781_CURRENT_UNITS / sense_res);
return 0;
}
static int ds2781_get_accumulated_current(struct ds2781_device_info *dev_info,
int *accumulated_current)
{
int ret, sense_res;
s16 current_raw;
u8 sense_res_raw;
/*
* The units of measurement for accumulated current are dependent on
* the value of the sense resistor.
*/
ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);
if (ret < 0)
return ret;
if (sense_res_raw == 0) {
dev_err(dev_info->dev, "sense resistor value is 0\n");
return -EINVAL;
}
sense_res = 1000 / sense_res_raw;
/*
* The ACR value is located in 16 bits across the ACR MSB and
* LSB registers
* Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR
* MSB register
* Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR
* LSB register
*/
ret = ds2781_read16(dev_info, &current_raw, DS2781_ACR_MSB);
if (ret < 0)
return ret;
*accumulated_current = current_raw * (DS2781_CHARGE_UNITS / sense_res);
return 0;
}
static int ds2781_get_capacity(struct ds2781_device_info *dev_info,
int *capacity)
{
int ret;
u8 raw;
ret = ds2781_read8(dev_info, &raw, DS2781_RARC);
if (ret < 0)
return ret;
*capacity = raw;
return 0;
}
static int ds2781_get_status(struct ds2781_device_info *dev_info, int *status)
{
int ret, current_uA, capacity;
ret = ds2781_get_current(dev_info, CURRENT_NOW, &current_uA);
if (ret < 0)
return ret;
ret = ds2781_get_capacity(dev_info, &capacity);
if (ret < 0)
return ret;
if (power_supply_am_i_supplied(&dev_info->bat)) {
if (capacity == 100)
*status = POWER_SUPPLY_STATUS_FULL;
else if (current_uA > 50000)
*status = POWER_SUPPLY_STATUS_CHARGING;
else
*status = POWER_SUPPLY_STATUS_NOT_CHARGING;
} else {
*status = POWER_SUPPLY_STATUS_DISCHARGING;
}
return 0;
}
static int ds2781_get_charge_now(struct ds2781_device_info *dev_info,
int *charge_now)
{
int ret;
u16 charge_raw;
/*
* The RAAC value is located in 16 bits across the RAAC MSB and
* LSB registers
* Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC
* MSB register
* Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC
* LSB register
*/
ret = ds2781_read16(dev_info, &charge_raw, DS2781_RAAC_MSB);
if (ret < 0)
return ret;
*charge_now = charge_raw * 1600;
return 0;
}
static int ds2781_get_control_register(struct ds2781_device_info *dev_info,
u8 *control_reg)
{
return ds2781_read8(dev_info, control_reg, DS2781_CONTROL);
}
static int ds2781_set_control_register(struct ds2781_device_info *dev_info,
u8 control_reg)
{
int ret;
ret = ds2781_write(dev_info, &control_reg,
DS2781_CONTROL, sizeof(u8));
if (ret < 0)
return ret;
return ds2781_save_eeprom(dev_info, DS2781_CONTROL);
}
static int ds2781_battery_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
int ret = 0;
struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
switch (psp) {
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
ret = ds2781_get_voltage(dev_info, &val->intval);
break;
case POWER_SUPPLY_PROP_TEMP:
ret = ds2781_get_temperature(dev_info, &val->intval);
break;
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = model;
break;
case POWER_SUPPLY_PROP_MANUFACTURER:
val->strval = manufacturer;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
ret = ds2781_get_current(dev_info, CURRENT_NOW, &val->intval);
break;
case POWER_SUPPLY_PROP_CURRENT_AVG:
ret = ds2781_get_current(dev_info, CURRENT_AVG, &val->intval);
break;
case POWER_SUPPLY_PROP_STATUS:
ret = ds2781_get_status(dev_info, &val->intval);
break;
case POWER_SUPPLY_PROP_CAPACITY:
ret = ds2781_get_capacity(dev_info, &val->intval);
break;
case POWER_SUPPLY_PROP_CHARGE_COUNTER:
ret = ds2781_get_accumulated_current(dev_info, &val->intval);
break;
case POWER_SUPPLY_PROP_CHARGE_NOW:
ret = ds2781_get_charge_now(dev_info, &val->intval);
break;
default:
ret = -EINVAL;
}
return ret;
}
static enum power_supply_property ds2781_battery_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_TEMP,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CURRENT_AVG,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_CHARGE_COUNTER,
POWER_SUPPLY_PROP_CHARGE_NOW,
};
static ssize_t ds2781_get_pmod_enabled(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u8 control_reg;
struct power_supply *psy = to_power_supply(dev);
struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
/* Get power mode */
ret = ds2781_get_control_register(dev_info, &control_reg);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n",
!!(control_reg & DS2781_CONTROL_PMOD));
}
static ssize_t ds2781_set_pmod_enabled(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count)
{
int ret;
u8 control_reg, new_setting;
struct power_supply *psy = to_power_supply(dev);
struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
/* Set power mode */
ret = ds2781_get_control_register(dev_info, &control_reg);
if (ret < 0)
return ret;
ret = kstrtou8(buf, 0, &new_setting);
if (ret < 0)
return ret;
if ((new_setting != 0) && (new_setting != 1)) {
dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");
return -EINVAL;
}
if (new_setting)
control_reg |= DS2781_CONTROL_PMOD;
else
control_reg &= ~DS2781_CONTROL_PMOD;
ret = ds2781_set_control_register(dev_info, control_reg);
if (ret < 0)
return ret;
return count;
}
static ssize_t ds2781_get_sense_resistor_value(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u8 sense_resistor;
struct power_supply *psy = to_power_supply(dev);
struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
ret = ds2781_read8(dev_info, &sense_resistor, DS2781_RSNSP);
if (ret < 0)
return ret;
ret = sprintf(buf, "%d\n", sense_resistor);
return ret;
}
static ssize_t ds2781_set_sense_resistor_value(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count)
{
int ret;
u8 new_setting;
struct power_supply *psy = to_power_supply(dev);
struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
ret = kstrtou8(buf, 0, &new_setting);
if (ret < 0)
return ret;
ret = ds2781_set_sense_register(dev_info, new_setting);
if (ret < 0)
return ret;
return count;
}
static ssize_t ds2781_get_rsgain_setting(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u16 rsgain;
struct power_supply *psy = to_power_supply(dev);
struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
ret = ds2781_get_rsgain_register(dev_info, &rsgain);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", rsgain);
}
static ssize_t ds2781_set_rsgain_setting(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count)
{
int ret;
u16 new_setting;
struct power_supply *psy = to_power_supply(dev);
struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
ret = kstrtou16(buf, 0, &new_setting);
if (ret < 0)
return ret;
/* Gain can only be from 0 to 1.999 in steps of .001 */
if (new_setting > 1999) {
dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");
return -EINVAL;
}
ret = ds2781_set_rsgain_register(dev_info, new_setting);
if (ret < 0)
return ret;
return count;
}
static ssize_t ds2781_get_pio_pin(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u8 sfr;
struct power_supply *psy = to_power_supply(dev);
struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
ret = ds2781_read8(dev_info, &sfr, DS2781_SFR);
if (ret < 0)
return ret;
ret = sprintf(buf, "%d\n", sfr & DS2781_SFR_PIOSC);
return ret;
}
static ssize_t ds2781_set_pio_pin(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t count)
{
int ret;
u8 new_setting;
struct power_supply *psy = to_power_supply(dev);
struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
ret = kstrtou8(buf, 0, &new_setting);
if (ret < 0)
return ret;
if ((new_setting != 0) && (new_setting != 1)) {
dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");
return -EINVAL;
}
ret = ds2781_write(dev_info, &new_setting,
DS2781_SFR, sizeof(u8));
if (ret < 0)
return ret;
return count;
}
static ssize_t ds2781_read_param_eeprom_bin(struct file *filp,
struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t count)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct power_supply *psy = to_power_supply(dev);
struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
count = min_t(loff_t, count,
DS2781_EEPROM_BLOCK1_END -
DS2781_EEPROM_BLOCK1_START + 1 - off);
return ds2781_read_block(dev_info, buf,
DS2781_EEPROM_BLOCK1_START + off, count);
}
static ssize_t ds2781_write_param_eeprom_bin(struct file *filp,
struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t count)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct power_supply *psy = to_power_supply(dev);
struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
int ret;
count = min_t(loff_t, count,
DS2781_EEPROM_BLOCK1_END -
DS2781_EEPROM_BLOCK1_START + 1 - off);
ret = ds2781_write(dev_info, buf,
DS2781_EEPROM_BLOCK1_START + off, count);
if (ret < 0)
return ret;
ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK1_START);
if (ret < 0)
return ret;
return count;
}
static struct bin_attribute ds2781_param_eeprom_bin_attr = {
.attr = {
.name = "param_eeprom",
.mode = S_IRUGO | S_IWUSR,
},
.size = DS2781_EEPROM_BLOCK1_END - DS2781_EEPROM_BLOCK1_START + 1,
.read = ds2781_read_param_eeprom_bin,
.write = ds2781_write_param_eeprom_bin,
};
static ssize_t ds2781_read_user_eeprom_bin(struct file *filp,
struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t count)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct power_supply *psy = to_power_supply(dev);
struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
count = min_t(loff_t, count,
DS2781_EEPROM_BLOCK0_END -
DS2781_EEPROM_BLOCK0_START + 1 - off);
return ds2781_read_block(dev_info, buf,
DS2781_EEPROM_BLOCK0_START + off, count);
}
static ssize_t ds2781_write_user_eeprom_bin(struct file *filp,
struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t count)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct power_supply *psy = to_power_supply(dev);
struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
int ret;
count = min_t(loff_t, count,
DS2781_EEPROM_BLOCK0_END -
DS2781_EEPROM_BLOCK0_START + 1 - off);
ret = ds2781_write(dev_info, buf,
DS2781_EEPROM_BLOCK0_START + off, count);
if (ret < 0)
return ret;
ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK0_START);
if (ret < 0)
return ret;
return count;
}
static struct bin_attribute ds2781_user_eeprom_bin_attr = {
.attr = {
.name = "user_eeprom",
.mode = S_IRUGO | S_IWUSR,
},
.size = DS2781_EEPROM_BLOCK0_END - DS2781_EEPROM_BLOCK0_START + 1,
.read = ds2781_read_user_eeprom_bin,
.write = ds2781_write_user_eeprom_bin,
};
static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2781_get_pmod_enabled,
ds2781_set_pmod_enabled);
static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,
ds2781_get_sense_resistor_value, ds2781_set_sense_resistor_value);
static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2781_get_rsgain_setting,
ds2781_set_rsgain_setting);
static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2781_get_pio_pin,
ds2781_set_pio_pin);
static struct attribute *ds2781_attributes[] = {
&dev_attr_pmod_enabled.attr,
&dev_attr_sense_resistor_value.attr,
&dev_attr_rsgain_setting.attr,
&dev_attr_pio_pin.attr,
NULL
};
static const struct attribute_group ds2781_attr_group = {
.attrs = ds2781_attributes,
};
static int __devinit ds2781_battery_probe(struct platform_device *pdev)
{
int ret = 0;
struct ds2781_device_info *dev_info;
dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL);
if (!dev_info) {
ret = -ENOMEM;
goto fail;
}
platform_set_drvdata(pdev, dev_info);
dev_info->dev = &pdev->dev;
dev_info->w1_dev = pdev->dev.parent;
dev_info->bat.name = dev_name(&pdev->dev);
dev_info->bat.type = POWER_SUPPLY_TYPE_BATTERY;
dev_info->bat.properties = ds2781_battery_props;
dev_info->bat.num_properties = ARRAY_SIZE(ds2781_battery_props);
dev_info->bat.get_property = ds2781_battery_get_property;
dev_info->mutex_holder = current;
ret = power_supply_register(&pdev->dev, &dev_info->bat);
if (ret) {
dev_err(dev_info->dev, "failed to register battery\n");
goto fail_free_info;
}
ret = sysfs_create_group(&dev_info->bat.dev->kobj, &ds2781_attr_group);
if (ret) {
dev_err(dev_info->dev, "failed to create sysfs group\n");
goto fail_unregister;
}
ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj,
&ds2781_param_eeprom_bin_attr);
if (ret) {
dev_err(dev_info->dev,
"failed to create param eeprom bin file");
goto fail_remove_group;
}
ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj,
&ds2781_user_eeprom_bin_attr);
if (ret) {
dev_err(dev_info->dev,
"failed to create user eeprom bin file");
goto fail_remove_bin_file;
}
dev_info->mutex_holder = NULL;
return 0;
fail_remove_bin_file:
sysfs_remove_bin_file(&dev_info->bat.dev->kobj,
&ds2781_param_eeprom_bin_attr);
fail_remove_group:
sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2781_attr_group);
fail_unregister:
power_supply_unregister(&dev_info->bat);
fail_free_info:
kfree(dev_info);
fail:
return ret;
}
static int __devexit ds2781_battery_remove(struct platform_device *pdev)
{
struct ds2781_device_info *dev_info = platform_get_drvdata(pdev);
dev_info->mutex_holder = current;
/* remove attributes */
sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2781_attr_group);
power_supply_unregister(&dev_info->bat);
kfree(dev_info);
return 0;
}
static struct platform_driver ds2781_battery_driver = {
.driver = {
.name = "ds2781-battery",
},
.probe = ds2781_battery_probe,
.remove = __devexit_p(ds2781_battery_remove),
};
static int __init ds2781_battery_init(void)
{
return platform_driver_register(&ds2781_battery_driver);
}
static void __exit ds2781_battery_exit(void)
{
platform_driver_unregister(&ds2781_battery_driver);
}
module_init(ds2781_battery_init);
module_exit(ds2781_battery_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
MODULE_DESCRIPTION("Maxim/Dallas DS2781 Stand-Alone Fuel Gauage IC driver");
MODULE_ALIAS("platform:ds2781-battery");

13
drivers/w1/slaves/Kconfig
View File

@ -81,6 +81,19 @@ config W1_SLAVE_DS2780
If you are unsure, say N.
config W1_SLAVE_DS2781
tristate "Dallas 2781 battery monitor chip"
depends on W1
help
If you enable this you will have the DS2781 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.
config W1_SLAVE_BQ27000
tristate "BQ27000 slave support"
depends on W1

1
drivers/w1/slaves/Makefile
View File

@ -10,4 +10,5 @@ obj-$(CONFIG_W1_SLAVE_DS2431) += w1_ds2431.o
obj-$(CONFIG_W1_SLAVE_DS2433) += w1_ds2433.o
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

201
drivers/w1/slaves/w1_ds2781.c Normal file
View File

@ -0,0 +1,201 @@
/*
* 1-Wire implementation for the ds2781 chip
*
* Author: Renata Sayakhova <renata@oktetlabs.ru>
*
* Based on w1-ds2780 driver
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/types.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/idr.h>
#include "../w1.h"
#include "../w1_int.h"
#include "../w1_family.h"
#include "w1_ds2781.h"
static int w1_ds2781_do_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 (addr > DS2781_DATA_SIZE || addr < 0)
return 0;
count = min_t(int, count, DS2781_DATA_SIZE - addr);
if (w1_reset_select_slave(sl) == 0) {
if (io) {
w1_write_8(sl->master, W1_DS2781_WRITE_DATA);
w1_write_8(sl->master, addr);
w1_write_block(sl->master, buf, count);
} else {
w1_write_8(sl->master, W1_DS2781_READ_DATA);
w1_write_8(sl->master, addr);
count = w1_read_block(sl->master, buf, count);
}
}
return count;
}
int w1_ds2781_io(struct device *dev, char *buf, int addr, size_t count,
int io)
{
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
int ret;
if (!dev)
return -ENODEV;
mutex_lock(&sl->master->mutex);
ret = w1_ds2781_do_io(dev, buf, addr, count, io);
mutex_unlock(&sl->master->mutex);
return ret;
}
EXPORT_SYMBOL(w1_ds2781_io);
int w1_ds2781_io_nolock(struct device *dev, char *buf, int addr, size_t count,
int io)
{
int ret;
if (!dev)
return -ENODEV;
ret = w1_ds2781_do_io(dev, buf, addr, count, io);
return ret;
}
EXPORT_SYMBOL(w1_ds2781_io_nolock);
int w1_ds2781_eeprom_cmd(struct device *dev, int addr, int cmd)
{
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
if (!dev)
return -EINVAL;
mutex_lock(&sl->master->mutex);
if (w1_reset_select_slave(sl) == 0) {
w1_write_8(sl->master, cmd);
w1_write_8(sl->master, addr);
}
mutex_unlock(&sl->master->mutex);
return 0;
}
EXPORT_SYMBOL(w1_ds2781_eeprom_cmd);
static ssize_t w1_ds2781_read_bin(struct file *filp,
struct kobject *kobj,
struct bin_attribute *bin_attr,
char *buf, loff_t off, size_t count)
{
struct device *dev = container_of(kobj, struct device, kobj);
return w1_ds2781_io(dev, buf, off, count, 0);
}
static struct bin_attribute w1_ds2781_bin_attr = {
.attr = {
.name = "w1_slave",
.mode = S_IRUGO,
},
.size = DS2781_DATA_SIZE,
.read = w1_ds2781_read_bin,
};
static DEFINE_IDA(bat_ida);
static int w1_ds2781_add_slave(struct w1_slave *sl)
{
int ret;
int id;
struct platform_device *pdev;
id = ida_simple_get(&bat_ida, 0, 0, GFP_KERNEL);
if (id < 0) {
ret = id;
goto noid;
}
pdev = platform_device_alloc("ds2781-battery", id);
if (!pdev) {
ret = -ENOMEM;
goto pdev_alloc_failed;
}
pdev->dev.parent = &sl->dev;
ret = platform_device_add(pdev);
if (ret)
goto pdev_add_failed;
ret = sysfs_create_bin_file(&sl->dev.kobj, &w1_ds2781_bin_attr);
if (ret)
goto bin_attr_failed;
dev_set_drvdata(&sl->dev, pdev);
return 0;
bin_attr_failed:
pdev_add_failed:
platform_device_unregister(pdev);
pdev_alloc_failed:
ida_simple_remove(&bat_ida, id);
noid:
return ret;
}
static void w1_ds2781_remove_slave(struct w1_slave *sl)
{
struct platform_device *pdev = dev_get_drvdata(&sl->dev);
int id = pdev->id;
platform_device_unregister(pdev);
ida_simple_remove(&bat_ida, id);
sysfs_remove_bin_file(&sl->dev.kobj, &w1_ds2781_bin_attr);
}
static struct w1_family_ops w1_ds2781_fops = {
.add_slave = w1_ds2781_add_slave,
.remove_slave = w1_ds2781_remove_slave,
};
static struct w1_family w1_ds2781_family = {
.fid = W1_FAMILY_DS2781,
.fops = &w1_ds2781_fops,
};
static int __init w1_ds2781_init(void)
{
ida_init(&bat_ida);
return w1_register_family(&w1_ds2781_family);
}
static void __exit w1_ds2781_exit(void)
{
w1_unregister_family(&w1_ds2781_family);
ida_destroy(&bat_ida);
}
module_init(w1_ds2781_init);
module_exit(w1_ds2781_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC");

136
drivers/w1/slaves/w1_ds2781.h Normal file
View File

@ -0,0 +1,136 @@
/*
* 1-Wire implementation for the ds2780 chip
*
* Author: Renata Sayakhova <renata@oktetlabs.ru>
*
* Based on w1-ds2760 driver
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#ifndef _W1_DS2781_H
#define _W1_DS2781_H
/* Function commands */
#define W1_DS2781_READ_DATA 0x69
#define W1_DS2781_WRITE_DATA 0x6C
#define W1_DS2781_COPY_DATA 0x48
#define W1_DS2781_RECALL_DATA 0xB8
#define W1_DS2781_LOCK 0x6A
/* Register map */
/* Register 0x00 Reserved */
#define DS2781_STATUS 0x01
#define DS2781_RAAC_MSB 0x02
#define DS2781_RAAC_LSB 0x03
#define DS2781_RSAC_MSB 0x04
#define DS2781_RSAC_LSB 0x05
#define DS2781_RARC 0x06
#define DS2781_RSRC 0x07
#define DS2781_IAVG_MSB 0x08
#define DS2781_IAVG_LSB 0x09
#define DS2781_TEMP_MSB 0x0A
#define DS2781_TEMP_LSB 0x0B
#define DS2781_VOLT_MSB 0x0C
#define DS2781_VOLT_LSB 0x0D
#define DS2781_CURRENT_MSB 0x0E
#define DS2781_CURRENT_LSB 0x0F
#define DS2781_ACR_MSB 0x10
#define DS2781_ACR_LSB 0x11
#define DS2781_ACRL_MSB 0x12
#define DS2781_ACRL_LSB 0x13
#define DS2781_AS 0x14
#define DS2781_SFR 0x15
#define DS2781_FULL_MSB 0x16
#define DS2781_FULL_LSB 0x17
#define DS2781_AE_MSB 0x18
#define DS2781_AE_LSB 0x19
#define DS2781_SE_MSB 0x1A
#define DS2781_SE_LSB 0x1B
/* Register 0x1C - 0x1E Reserved */
#define DS2781_EEPROM 0x1F
#define DS2781_EEPROM_BLOCK0_START 0x20
/* Register 0x20 - 0x2F User EEPROM */
#define DS2781_EEPROM_BLOCK0_END 0x2F
/* Register 0x30 - 0x5F Reserved */
#define DS2781_EEPROM_BLOCK1_START 0x60
#define DS2781_CONTROL 0x60
#define DS2781_AB 0x61
#define DS2781_AC_MSB 0x62
#define DS2781_AC_LSB 0x63
#define DS2781_VCHG 0x64
#define DS2781_IMIN 0x65
#define DS2781_VAE 0x66
#define DS2781_IAE 0x67
#define DS2781_AE_40 0x68
#define DS2781_RSNSP 0x69
#define DS2781_FULL_40_MSB 0x6A
#define DS2781_FULL_40_LSB 0x6B
#define DS2781_FULL_4_SLOPE 0x6C
#define DS2781_FULL_3_SLOPE 0x6D
#define DS2781_FULL_2_SLOPE 0x6E
#define DS2781_FULL_1_SLOPE 0x6F
#define DS2781_AE_4_SLOPE 0x70
#define DS2781_AE_3_SLOPE 0x71
#define DS2781_AE_2_SLOPE 0x72
#define DS2781_AE_1_SLOPE 0x73
#define DS2781_SE_4_SLOPE 0x74
#define DS2781_SE_3_SLOPE 0x75
#define DS2781_SE_2_SLOPE 0x76
#define DS2781_SE_1_SLOPE 0x77
#define DS2781_RSGAIN_MSB 0x78
#define DS2781_RSGAIN_LSB 0x79
#define DS2781_RSTC 0x7A
#define DS2781_COB 0x7B
#define DS2781_TBP34 0x7C
#define DS2781_TBP23 0x7D
#define DS2781_TBP12 0x7E
#define DS2781_EEPROM_BLOCK1_END 0x7F
/* Register 0x7D - 0xFF Reserved */
#define DS2781_FSGAIN_MSB 0xB0
#define DS2781_FSGAIN_LSB 0xB1
/* Number of valid register addresses */
#define DS2781_DATA_SIZE 0xB2
/* Status register bits */
#define DS2781_STATUS_CHGTF (1 << 7)
#define DS2781_STATUS_AEF (1 << 6)
#define DS2781_STATUS_SEF (1 << 5)
#define DS2781_STATUS_LEARNF (1 << 4)
/* Bit 3 Reserved */
#define DS2781_STATUS_UVF (1 << 2)
#define DS2781_STATUS_PORF (1 << 1)
/* Bit 0 Reserved */
/* Control register bits */
/* Bit 7 Reserved */
#define DS2781_CONTROL_NBEN (1 << 7)
#define DS2781_CONTROL_UVEN (1 << 6)
#define DS2781_CONTROL_PMOD (1 << 5)
#define DS2781_CONTROL_RNAOP (1 << 4)
#define DS1781_CONTROL_UVTH (1 << 3)
/* Bit 0 - 2 Reserved */
/* Special feature register bits */
/* Bit 1 - 7 Reserved */
#define DS2781_SFR_PIOSC (1 << 0)
/* EEPROM register bits */
#define DS2781_EEPROM_EEC (1 << 7)
#define DS2781_EEPROM_LOCK (1 << 6)
/* Bit 2 - 6 Reserved */
#define DS2781_EEPROM_BL1 (1 << 1)
#define DS2781_EEPROM_BL0 (1 << 0)
extern int w1_ds2781_io(struct device *dev, char *buf, int addr, size_t count,
int io);
extern int w1_ds2781_io_nolock(struct device *dev, char *buf, int addr,
size_t count, int io);
extern int w1_ds2781_eeprom_cmd(struct device *dev, int addr, int cmd);
#endif /* !_W1_DS2781_H */

1
drivers/w1/w1_family.h
View File

@ -38,6 +38,7 @@
#define W1_EEPROM_DS2431 0x2D
#define W1_FAMILY_DS2760 0x30
#define W1_FAMILY_DS2780 0x32
#define W1_FAMILY_DS2781 0x3D
#define W1_THERM_DS28EA00 0x42
#define MAXNAMELEN 32