Ryan Mallon wrote: > > Updated patch below. > > Any further comments on this? I got an IP blocked bounce on Anton's cbou@xxxxxxx, so have CC'ed his other address here. > --- > Add support for the DS2782 stand-alone I2C gas-gauge > > Signed-off-by: Ryan Mallon <ryan@xxxxxxxxxxxxxxxx> > --- > > diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig > index 33da112..b9c818f 100644 > --- a/drivers/power/Kconfig > +++ b/drivers/power/Kconfig > @@ -43,6 +43,13 @@ config BATTERY_DS2760 > help > Say Y here to enable support for batteries with ds2760 chip. > > +config BATTERY_DS2782 > + tristate "DS2782 standalone gas-gauge" > + depends on I2C > + help > + Say Y here to enable support for the DS2782 standalone battery > + gas-gauge. > + > config BATTERY_PMU > tristate "Apple PMU battery" > depends on PPC32 && ADB_PMU > diff --git a/drivers/power/Makefile b/drivers/power/Makefile > index 2fcf41d..ad1ac61 100644 > --- a/drivers/power/Makefile > +++ b/drivers/power/Makefile > @@ -19,6 +19,7 @@ obj-$(CONFIG_APM_POWER) += apm_power.o > obj-$(CONFIG_WM8350_POWER) += wm8350_power.o > > obj-$(CONFIG_BATTERY_DS2760) += ds2760_battery.o > +obj-$(CONFIG_BATTERY_DS2782) += ds2782_battery.o > obj-$(CONFIG_BATTERY_PMU) += pmu_battery.o > obj-$(CONFIG_BATTERY_OLPC) += olpc_battery.o > obj-$(CONFIG_BATTERY_TOSA) += tosa_battery.o > diff --git a/drivers/power/ds2782_battery.c b/drivers/power/ds2782_battery.c > new file mode 100644 > index 0000000..cfd4d28 > --- /dev/null > +++ b/drivers/power/ds2782_battery.c > @@ -0,0 +1,321 @@ > +/* > + * drivers/power/ds2782_battery.c > + * > + * I2C client/driver for the Maxim/Dallas DS2782 Stand-Alone Fuel Gauge IC > + * > + * Copyright (C) 2009 Bluewater Systems Ltd > + * Author: Ryan Mallon <ryan@xxxxxxxxxxxxxxxx> > + * > + * 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/i2c.h> > +#include <linux/idr.h> > +#include <linux/power_supply.h> > + > +#define DS2782_REG_RARC 0x06 /* Remaining active relative capacity */ > + > +#define DS2782_REG_VOLT_MSB 0x0c > +#define DS2782_REG_TEMP_MSB 0x0a > +#define DS2782_REG_CURRENT_MSB 0x0e > + > +/* EEPROM Block */ > +#define DS2782_REG_RSNSP 0x69 /* Sense resistor value */ > + > +/* Current unit measurement in uA for a 1 milli-ohm sense resistor */ > +#define DS2782_CURRENT_UNITS 1563 > + > +#define to_ds2782_info(x) container_of(x, struct ds2782_info, battery) > + > +struct ds2782_info { > + struct i2c_client *client; > + struct power_supply battery; > + int id; > +}; > + > +static DEFINE_IDR(battery_id); > +static DEFINE_MUTEX(battery_lock); > + > +static inline int ds2782_read_reg(struct ds2782_info *info, int reg, u8 *val) > +{ > + int ret = i2c_smbus_read_byte_data(info->client, reg); > + if (ret < 0) { > + dev_err(&info->client->dev, "register read failed\n"); > + return ret; > + } > + > + *val = ret; > + return 0; > +} > + > +static inline int ds2782_read_reg16(struct ds2782_info *info, int reg_msb, > + s16 *val) > +{ > + int ret = swab16(i2c_smbus_read_word_data(info->client, reg_msb)); > + if (ret < 0) { > + dev_err(&info->client->dev, "register read failed\n"); > + return ret; > + } > + > + *val = ret; > + return 0; > +} > + > +static int ds2782_get_temp(struct ds2782_info *info, int *temp) > +{ > + s16 raw; > + int err; > + > + /* > + * Temperature is measured in units of 0.125 degrees celcius, the > + * power_supply class measures temperature in tenths of degrees > + * celsius. The temperature value is stored as a 10 bit number, plus > + * sign in the upper bits of a 16 bit register. > + */ > + err = ds2782_read_reg16(info, DS2782_REG_TEMP_MSB, &raw); > + if (err) > + return err; > + *temp = ((raw / 32) * 125) / 100; > + return 0; > +} > + > +static int ds2782_get_current(struct ds2782_info *info, int *current_uA) > +{ > + int sense_res, err; > + u8 sense_res_raw; > + s16 raw; > + > + /* > + * The units of measurement for current are dependent on the value of > + * the sense resistor. > + */ > + err = ds2782_read_reg(info, DS2782_REG_RSNSP, &sense_res_raw); > + if (err) > + return err; > + if (sense_res_raw == 0) { > + dev_err(&info->client->dev, "sense resistor value is 0\n"); > + return -ENXIO; > + } > + sense_res = 1000 / sense_res_raw; > + > + dev_dbg(&info->client->dev, "sense resistor = %d milli-ohms\n", > + sense_res); > + err = ds2782_read_reg16(info, DS2782_REG_CURRENT_MSB, &raw); > + if (err) > + return err; > + *current_uA = raw * (DS2782_CURRENT_UNITS / sense_res); > + return 0; > +} > + > +static int ds2782_get_voltage(struct ds2782_info *info, int *voltage_uA) > +{ > + s16 raw; > + int err; > + > + /* > + * Voltage is measured in units of 4.88mV. The voltage is stored as > + * a 10-bit number plus sign, in the upper bits of a 16-bit register > + */ > + err = ds2782_read_reg16(info, DS2782_REG_VOLT_MSB, &raw); > + if (err) > + return err; > + *voltage_uA = (raw / 32) * 4800; > + return 0; > +} > + > +static int ds2782_get_capacity(struct ds2782_info *info, int *capacity) > +{ > + int err; > + u8 raw; > + > + err = ds2782_read_reg(info, DS2782_REG_RARC, &raw); > + if (err) > + return err; > + *capacity = raw; > + return raw; > +} > + > +static int ds2782_get_status(struct ds2782_info *info, int *status) > +{ > + int err, current_uA, capacity; > + > + err = ds2782_get_current(info, ¤t_uA); > + if (err) > + return err; > + > + err = ds2782_get_capacity(info, &capacity); > + if (err) > + return err; > + > + if (capacity == 100) > + *status = POWER_SUPPLY_STATUS_FULL; > + else if (current_uA == 0) > + *status = POWER_SUPPLY_STATUS_NOT_CHARGING; > + else if (current_uA < 0) > + *status = POWER_SUPPLY_STATUS_DISCHARGING; > + else > + *status = POWER_SUPPLY_STATUS_CHARGING; > + > + return 0; > +} > + > +static int ds2782_battery_get_property(struct power_supply *psy, > + enum power_supply_property prop, > + union power_supply_propval *val) > +{ > + struct ds2782_info *info = to_ds2782_info(psy); > + int ret; > + > + switch (prop) { > + case POWER_SUPPLY_PROP_STATUS: > + ret = ds2782_get_status(info, &val->intval); > + break; > + > + case POWER_SUPPLY_PROP_CAPACITY: > + ret = ds2782_get_capacity(info, &val->intval); > + break; > + > + case POWER_SUPPLY_PROP_VOLTAGE_NOW: > + ret = ds2782_get_voltage(info, &val->intval); > + break; > + > + case POWER_SUPPLY_PROP_CURRENT_NOW: > + ret = ds2782_get_current(info, &val->intval); > + break; > + > + case POWER_SUPPLY_PROP_TEMP: > + ret = ds2782_get_temp(info, &val->intval); > + break; > + > + default: > + ret = -EINVAL; > + } > + > + return ret; > +} > + > +static enum power_supply_property ds2782_battery_props[] = { > + POWER_SUPPLY_PROP_STATUS, > + POWER_SUPPLY_PROP_CAPACITY, > + POWER_SUPPLY_PROP_VOLTAGE_NOW, > + POWER_SUPPLY_PROP_CURRENT_NOW, > + POWER_SUPPLY_PROP_TEMP, > +}; > + > +static void ds2782_power_supply_init(struct power_supply *battery) > +{ > + battery->type = POWER_SUPPLY_TYPE_BATTERY; > + battery->properties = ds2782_battery_props; > + battery->num_properties = ARRAY_SIZE(ds2782_battery_props); > + battery->get_property = ds2782_battery_get_property; > + battery->external_power_changed = NULL; > +} > + > +static int ds2782_battery_remove(struct i2c_client *client) > +{ > + struct ds2782_info *info = i2c_get_clientdata(client); > + > + power_supply_unregister(&info->battery); > + kfree(info->battery.name); > + > + mutex_lock(&battery_lock); > + idr_remove(&battery_id, info->id); > + mutex_unlock(&battery_lock); > + > + i2c_set_clientdata(client, info); > + > + kfree(info); > + return 0; > +} > + > +static int ds2782_battery_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + struct ds2782_info *info; > + int ret, num; > + > + /* Get an ID for this battery */ > + ret = idr_pre_get(&battery_id, GFP_KERNEL); > + if (ret == 0) { > + ret = -ENOMEM; > + goto fail_id; > + } > + > + mutex_lock(&battery_lock); > + ret = idr_get_new(&battery_id, client, &num); > + mutex_unlock(&battery_lock); > + if (ret < 0) > + goto fail_id; > + > + info = kzalloc(sizeof(struct ds2782_info), GFP_KERNEL); > + if (!info) { > + ret = -ENOMEM; > + goto fail_info; > + } > + > + info->battery.name = kasprintf(GFP_KERNEL, "ds2782-%d", num); > + if (!info->battery.name) { > + ret = -ENOMEM; > + goto fail_name; > + } > + > + i2c_set_clientdata(client, info); > + info->client = client; > + ds2782_power_supply_init(&info->battery); > + > + ret = power_supply_register(&client->dev, &info->battery); > + if (ret) { > + dev_err(&client->dev, "failed to register battery\n"); > + goto fail_register; > + } > + > + return 0; > + > +fail_register: > + kfree(info->battery.name); > +fail_name: > + i2c_set_clientdata(client, info); > + kfree(info); > +fail_info: > + mutex_lock(&battery_lock); > + idr_remove(&battery_id, num); > + mutex_unlock(&battery_lock); > +fail_id: > + return ret; > +} > + > +static const struct i2c_device_id ds2782_id[] = { > + {"ds2782", 0}, > + {}, > +}; > + > +static struct i2c_driver ds2782_battery_driver = { > + .driver = { > + .name = "ds2782-battery", > + }, > + .probe = ds2782_battery_probe, > + .remove = ds2782_battery_remove, > + .id_table = ds2782_id, > +}; > + > +static int __init ds2782_init(void) > +{ > + return i2c_add_driver(&ds2782_battery_driver); > +} > + > +static void __exit ds2782_exit(void) > +{ > + i2c_del_driver(&ds2782_battery_driver); > +} > + > +module_init(ds2782_init); > +module_exit(ds2782_exit); > + > +MODULE_AUTHOR("Ryan Mallon <ryan@xxxxxxxxxxxxxxxx>"); > +MODULE_DESCRIPTION("Maxim/Dallas DS2782 Stand-Alone Fuel Gauage IC driver"); > +MODULE_LICENSE("GPL"); > > > -- Bluewater Systems Ltd - ARM Technology Solution Centre Ryan Mallon Unit 5, Amuri Park Phone: +64 3 3779127 404 Barbadoes St Fax: +64 3 3779135 PO Box 13 889 Email: ryan@xxxxxxxxxxxxxxxx Christchurch, 8013 Web: http://www.bluewatersys.com New Zealand Freecall Australia 1800 148 751 USA 1800 261 2934 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html