diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/power/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/power/Makefile | 1 | ||||
| -rw-r--r-- | drivers/power/ds2780_battery.c | 853 | ||||
| -rw-r--r-- | drivers/w1/slaves/Kconfig | 13 | ||||
| -rw-r--r-- | drivers/w1/slaves/Makefile | 1 | ||||
| -rw-r--r-- | drivers/w1/slaves/w1_ds2780.c | 217 | ||||
| -rw-r--r-- | drivers/w1/slaves/w1_ds2780.h | 129 | ||||
| -rw-r--r-- | drivers/w1/w1_family.h | 1 |
8 files changed, 1222 insertions, 0 deletions
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index 52a462f..dc8c531 100644 --- a/drivers/power/Kconfig +++ b/drivers/power/Kconfig @@ -68,6 +68,13 @@ config BATTERY_DS2760 help Say Y here to enable support for batteries with ds2760 chip. +config BATTERY_DS2780 + tristate "DS2780 battery driver" + select W1 + select W1_SLAVE_DS2780 + help + Say Y here to enable support for batteries with ds2780 chip. + config BATTERY_DS2782 tristate "DS2782/DS2786 standalone gas-gauge" depends on I2C diff --git a/drivers/power/Makefile b/drivers/power/Makefile index 8385bfa..8224990 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_WM8350_POWER) += wm8350_power.o obj-$(CONFIG_TEST_POWER) += test_power.o obj-$(CONFIG_BATTERY_DS2760) += ds2760_battery.o +obj-$(CONFIG_BATTERY_DS2780) += ds2780_battery.o obj-$(CONFIG_BATTERY_DS2782) += ds2782_battery.o obj-$(CONFIG_BATTERY_PMU) += pmu_battery.o obj-$(CONFIG_BATTERY_OLPC) += olpc_battery.o diff --git a/drivers/power/ds2780_battery.c b/drivers/power/ds2780_battery.c new file mode 100644 index 0000000..1fefe82 --- /dev/null +++ b/drivers/power/ds2780_battery.c @@ -0,0 +1,853 @@ +/* + * 1-wire client/driver for the Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC + * + * Copyright (C) 2010 Indesign, LLC + * + * Author: Clifton Barnes <cabarnes@indesign-llc.com> + * + * Based on ds2760_battery and ds2782_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_ds2780.h" + +/* Current unit measurement in uA for a 1 milli-ohm sense resistor */ +#define DS2780_CURRENT_UNITS 1563 +/* Charge unit measurement in uAh for a 1 milli-ohm sense resistor */ +#define DS2780_CHARGE_UNITS 6250 +/* Number of bytes in user EEPROM space */ +#define DS2780_USER_EEPROM_SIZE (DS2780_EEPROM_BLOCK0_END - \ + DS2780_EEPROM_BLOCK0_START + 1) +/* Number of bytes in parameter EEPROM space */ +#define DS2780_PARAM_EEPROM_SIZE (DS2780_EEPROM_BLOCK1_END - \ + DS2780_EEPROM_BLOCK1_START + 1) + +struct ds2780_device_info { + struct device *dev; + struct power_supply bat; + struct device *w1_dev; +}; + +enum current_types { + CURRENT_NOW, + CURRENT_AVG, +}; + +static const char model[] = "DS2780"; +static const char manufacturer[] = "Maxim/Dallas"; + +static inline struct ds2780_device_info *to_ds2780_device_info( + struct power_supply *psy) +{ + return container_of(psy, struct ds2780_device_info, bat); +} + +static inline struct power_supply *to_power_supply(struct device *dev) +{ + return dev_get_drvdata(dev); +} + +static inline int ds2780_read8(struct device *dev, u8 *val, int addr) +{ + return w1_ds2780_io(dev, val, addr, sizeof(u8), 0); +} + +static int ds2780_read16(struct device *dev, s16 *val, int addr) +{ + int ret; + u8 raw[2]; + + ret = w1_ds2780_io(dev, raw, addr, sizeof(u8) * 2, 0); + if (ret < 0) + return ret; + + *val = (raw[0] << 8) | raw[1]; + + return 0; +} + +static inline int ds2780_read_block(struct device *dev, u8 *val, int addr, + size_t count) +{ + return w1_ds2780_io(dev, val, addr, count, 0); +} + +static inline int ds2780_write(struct device *dev, u8 *val, int addr, + size_t count) +{ + return w1_ds2780_io(dev, val, addr, count, 1); +} + +static inline int ds2780_store_eeprom(struct device *dev, int addr) +{ + return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_COPY_DATA); +} + +static inline int ds2780_recall_eeprom(struct device *dev, int addr) +{ + return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_RECALL_DATA); +} + +static int ds2780_save_eeprom(struct ds2780_device_info *dev_info, int reg) +{ + int ret; + + ret = ds2780_store_eeprom(dev_info->w1_dev, reg); + if (ret < 0) + return ret; + + ret = ds2780_recall_eeprom(dev_info->w1_dev, reg); + if (ret < 0) + return ret; + + return 0; +} + +/* Set sense resistor value in mhos */ +static int ds2780_set_sense_register(struct ds2780_device_info *dev_info, + u8 conductance) +{ + int ret; + + ret = ds2780_write(dev_info->w1_dev, &conductance, + DS2780_RSNSP_REG, sizeof(u8)); + if (ret < 0) + return ret; + + return ds2780_save_eeprom(dev_info, DS2780_RSNSP_REG); +} + +/* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */ +static int ds2780_get_rsgain_register(struct ds2780_device_info *dev_info, + u16 *rsgain) +{ + return ds2780_read16(dev_info->w1_dev, rsgain, DS2780_RSGAIN_MSB_REG); +} + +/* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */ +static int ds2780_set_rsgain_register(struct ds2780_device_info *dev_info, + u16 rsgain) +{ + int ret; + u8 raw[] = {rsgain >> 8, rsgain & 0xFF}; + + ret = ds2780_write(dev_info->w1_dev, raw, + DS2780_RSGAIN_MSB_REG, sizeof(u8) * 2); + if (ret < 0) + return ret; + + return ds2780_save_eeprom(dev_info, DS2780_RSGAIN_MSB_REG); +} + +static int ds2780_get_voltage(struct ds2780_device_info *dev_info, + int *voltage_uV) +{ + int ret; + s16 voltage_raw; + + /* + * 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 + */ + ret = ds2780_read16(dev_info->w1_dev, &voltage_raw, + DS2780_VOLT_MSB_REG); + if (ret < 0) + return ret; + + /* + * DS2780 reports voltage in units of 4.88mV, but the battery class + * reports in units of uV, so convert by multiplying by 4880. + */ + *voltage_uV = (voltage_raw / 32) * 4880; + return 0; +} + +static int ds2780_get_temperature(struct ds2780_device_info *dev_info, + int *temperature) +{ + int ret; + s16 temperature_raw; + + /* + * 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 + */ + ret = ds2780_read16(dev_info->w1_dev, &temperature_raw, + DS2780_TEMP_MSB_REG); + if (ret < 0) + return ret; + + /* + * 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. + */ + *temperature = ((temperature_raw / 32) * 125) / 100; + return 0; +} + +static int ds2780_get_current(struct ds2780_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 = ds2780_read8(dev_info->w1_dev, &sense_res_raw, DS2780_RSNSP_REG); + if (ret < 0) + return ret; + + if (sense_res_raw == 0) { + dev_err(dev_info->dev, "sense resistor value is 0\n"); + return -ENXIO; + } + sense_res = 1000 / sense_res_raw; + + if (type == CURRENT_NOW) + reg_msb = DS2780_CURRENT_MSB_REG; + else if (type == CURRENT_AVG) + reg_msb = DS2780_IAVG_MSB_REG; + 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 = ds2780_read16(dev_info->w1_dev, ¤t_raw, reg_msb); + if (ret < 0) + return ret; + + *current_uA = current_raw * (DS2780_CURRENT_UNITS / sense_res); + return 0; +} + +static int ds2780_get_accumulated_current(struct ds2780_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 = ds2780_read8(dev_info->w1_dev, &sense_res_raw, DS2780_RSNSP_REG); + if (ret < 0) + return ret; + + if (sense_res_raw == 0) { + dev_err(dev_info->dev, "sense resistor value is 0\n"); + return -ENXIO; + } + 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 = ds2780_read16(dev_info->w1_dev, ¤t_raw, DS2780_ACR_MSB_REG); + if (ret < 0) + return ret; + + *accumulated_current = current_raw * (DS2780_CHARGE_UNITS / sense_res); + return 0; +} + +static int ds2780_get_capacity(struct ds2780_device_info *dev_info, + int *capacity) +{ + int ret; + u8 raw; + + ret = ds2780_read8(dev_info->w1_dev, &raw, DS2780_RARC_REG); + if (ret < 0) + return ret; + + *capacity = raw; + return raw; +} + +static int ds2780_get_status(struct ds2780_device_info *dev_info, int *status) +{ + int ret, current_uA, capacity; + + ret = ds2780_get_current(dev_info, CURRENT_NOW, ¤t_uA); + if (ret < 0) + return ret; + + ret = ds2780_get_capacity(dev_info, &capacity); + if (ret < 0) + return ret; + + 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 ds2780_get_charge_now(struct ds2780_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 = ds2780_read16(dev_info->w1_dev, &charge_raw, DS2780_RAAC_MSB_REG); + if (ret < 0) + return ret; + + *charge_now = charge_raw * 1600; + return 0; +} + +static int ds2780_get_control_register(struct ds2780_device_info *dev_info, + u8 *control_reg) +{ + return ds2780_read8(dev_info->w1_dev, control_reg, DS2780_CONTROL_REG); +} + +static int ds2780_set_control_register(struct ds2780_device_info *dev_info, + u8 control_reg) +{ + int ret; + + ret = ds2780_write(dev_info->w1_dev, &control_reg, + DS2780_CONTROL_REG, sizeof(u8)); + if (ret < 0) + return ret; + + return ds2780_save_eeprom(dev_info, DS2780_CONTROL_REG); +} + +static int ds2780_battery_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + int ret = 0; + struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); + + switch (psp) { + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + ret = ds2780_get_voltage(dev_info, &val->intval); + break; + + case POWER_SUPPLY_PROP_TEMP: + ret = ds2780_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 = ds2780_get_current(dev_info, CURRENT_NOW, &val->intval); + break; + + case POWER_SUPPLY_PROP_CURRENT_AVG: + ret = ds2780_get_current(dev_info, CURRENT_AVG, &val->intval); + break; + + case POWER_SUPPLY_PROP_STATUS: + ret = ds2780_get_status(dev_info, &val->intval); + break; + + case POWER_SUPPLY_PROP_CAPACITY: + ret = ds2780_get_capacity(dev_info, &val->intval); + break; + + case POWER_SUPPLY_PROP_CHARGE_COUNTER: + ret = ds2780_get_accumulated_current(dev_info, &val->intval); + break; + + case POWER_SUPPLY_PROP_CHARGE_NOW: + ret = ds2780_get_charge_now(dev_info, &val->intval); + break; + + default: + ret = -EINVAL; + } + + return ret; +} + +static enum power_supply_property ds2780_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 ds2780_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 ds2780_device_info *dev_info = to_ds2780_device_info(psy); + + /* Get power mode */ + ret = ds2780_get_control_register(dev_info, &control_reg); + if (ret < 0) + return ret; + + return sprintf(buf, "%d\n", + !!(control_reg & DS2780_CONTROL_REG_PMOD)); +} + +static ssize_t ds2780_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 ds2780_device_info *dev_info = to_ds2780_device_info(psy); + + /* Set power mode */ + ret = ds2780_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 |= DS2780_CONTROL_REG_PMOD; + else + control_reg &= ~DS2780_CONTROL_REG_PMOD; + + ret = ds2780_set_control_register(dev_info, control_reg); + if (ret < 0) + return ret; + + return count; +} + +static ssize_t ds2780_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 ds2780_device_info *dev_info = to_ds2780_device_info(psy); + + ret = ds2780_read8(dev_info->w1_dev, &sense_resistor, DS2780_RSNSP_REG); + if (ret < 0) + return ret; + + ret = sprintf(buf, "%d\n", sense_resistor); + return ret; +} + +static ssize_t ds2780_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 ds2780_device_info *dev_info = to_ds2780_device_info(psy); + + ret = kstrtou8(buf, 0, &new_setting); + if (ret < 0) + return ret; + + ret = ds2780_set_sense_register(dev_info, new_setting); + if (ret < 0) + return ret; + + return count; +} + +static ssize_t ds2780_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 ds2780_device_info *dev_info = to_ds2780_device_info(psy); + + ret = ds2780_get_rsgain_register(dev_info, &rsgain); + if (ret < 0) + return ret; + + return sprintf(buf, "%d\n", rsgain); +} + +static ssize_t ds2780_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 ds2780_device_info *dev_info = to_ds2780_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 = ds2780_set_rsgain_register(dev_info, new_setting); + if (ret < 0) + return ret; + + return count; +} + +static ssize_t ds2780_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 ds2780_device_info *dev_info = to_ds2780_device_info(psy); + + ret = ds2780_read8(dev_info->w1_dev, &sfr, DS2780_SFR_REG); + if (ret < 0) + return ret; + + ret = sprintf(buf, "%d\n", sfr & DS2780_SFR_REG_PIOSC); + return ret; +} + +static ssize_t ds2780_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 ds2780_device_info *dev_info = to_ds2780_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 = ds2780_write(dev_info->w1_dev, &new_setting, + DS2780_SFR_REG, sizeof(u8)); + if (ret < 0) + return ret; + + return count; +} + +static ssize_t ds2780_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 ds2780_device_info *dev_info = to_ds2780_device_info(psy); + + count = min_t(loff_t, count, + DS2780_EEPROM_BLOCK1_END - + DS2780_EEPROM_BLOCK1_START + 1 - off); + + return ds2780_read_block(dev_info->w1_dev, buf, + DS2780_EEPROM_BLOCK1_START + off, count); +} + +static ssize_t ds2780_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 ds2780_device_info *dev_info = to_ds2780_device_info(psy); + int ret; + + count = min_t(loff_t, count, + DS2780_EEPROM_BLOCK1_END - + DS2780_EEPROM_BLOCK1_START + 1 - off); + + ret = ds2780_write(dev_info->w1_dev, buf, + DS2780_EEPROM_BLOCK1_START + off, count); + if (ret < 0) + return ret; + + ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK1_START); + if (ret < 0) + return ret; + + return count; +} + +static struct bin_attribute ds2780_param_eeprom_bin_attr = { + .attr = { + .name = "param_eeprom", + .mode = S_IRUGO | S_IWUSR, + }, + .size = DS2780_EEPROM_BLOCK1_END - DS2780_EEPROM_BLOCK1_START + 1, + .read = ds2780_read_param_eeprom_bin, + .write = ds2780_write_param_eeprom_bin, +}; + +static ssize_t ds2780_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 ds2780_device_info *dev_info = to_ds2780_device_info(psy); + + count = min_t(loff_t, count, + DS2780_EEPROM_BLOCK0_END - + DS2780_EEPROM_BLOCK0_START + 1 - off); + + return ds2780_read_block(dev_info->w1_dev, buf, + DS2780_EEPROM_BLOCK0_START + off, count); + +} + +static ssize_t ds2780_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 ds2780_device_info *dev_info = to_ds2780_device_info(psy); + int ret; + + count = min_t(loff_t, count, + DS2780_EEPROM_BLOCK0_END - + DS2780_EEPROM_BLOCK0_START + 1 - off); + + ret = ds2780_write(dev_info->w1_dev, buf, + DS2780_EEPROM_BLOCK0_START + off, count); + if (ret < 0) + return ret; + + ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK0_START); + if (ret < 0) + return ret; + + return count; +} + +static struct bin_attribute ds2780_user_eeprom_bin_attr = { + .attr = { + .name = "user_eeprom", + .mode = S_IRUGO | S_IWUSR, + }, + .size = DS2780_EEPROM_BLOCK0_END - DS2780_EEPROM_BLOCK0_START + 1, + .read = ds2780_read_user_eeprom_bin, + .write = ds2780_write_user_eeprom_bin, +}; + +static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2780_get_pmod_enabled, + ds2780_set_pmod_enabled); +static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR, + ds2780_get_sense_resistor_value, ds2780_set_sense_resistor_value); +static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2780_get_rsgain_setting, + ds2780_set_rsgain_setting); +static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2780_get_pio_pin, + ds2780_set_pio_pin); + + +static struct attribute *ds2780_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 ds2780_attr_group = { + .attrs = ds2780_attributes, +}; + +static int __devinit ds2780_battery_probe(struct platform_device *pdev) +{ + int ret = 0; + struct ds2780_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 = ds2780_battery_props; + dev_info->bat.num_properties = ARRAY_SIZE(ds2780_battery_props); + dev_info->bat.get_property = ds2780_battery_get_property; + + 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, &ds2780_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, + &ds2780_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, + &ds2780_user_eeprom_bin_attr); + if (ret) { + dev_err(dev_info->dev, + "failed to create user eeprom bin file"); + goto fail_remove_bin_file; + } + + return 0; + +fail_remove_bin_file: + sysfs_remove_bin_file(&dev_info->bat.dev->kobj, + &ds2780_param_eeprom_bin_attr); +fail_remove_group: + sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group); +fail_unregister: + power_supply_unregister(&dev_info->bat); +fail_free_info: + kfree(dev_info); +fail: + return ret; +} + +static int __devexit ds2780_battery_remove(struct platform_device *pdev) +{ + struct ds2780_device_info *dev_info = platform_get_drvdata(pdev); + + /* remove attributes */ + sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group); + + power_supply_unregister(&dev_info->bat); + + kfree(dev_info); + return 0; +} + +MODULE_ALIAS("platform:ds2780-battery"); + +static struct platform_driver ds2780_battery_driver = { + .driver = { + .name = "ds2780-battery", + }, + .probe = ds2780_battery_probe, + .remove = ds2780_battery_remove, +}; + +static int __init ds2780_battery_init(void) +{ + return platform_driver_register(&ds2780_battery_driver); +} + +static void __exit ds2780_battery_exit(void) +{ + platform_driver_unregister(&ds2780_battery_driver); +} + +module_init(ds2780_battery_init); +module_exit(ds2780_battery_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>"); +MODULE_DESCRIPTION("Maxim/Dallas DS2780 Stand-Alone Fuel Gauage IC driver"); diff --git a/drivers/w1/slaves/Kconfig b/drivers/w1/slaves/Kconfig index cd1b724..d0cb01b 100644 --- a/drivers/w1/slaves/Kconfig +++ b/drivers/w1/slaves/Kconfig @@ -68,6 +68,19 @@ config W1_SLAVE_DS2760 If you are unsure, say N. +config W1_SLAVE_DS2780 + tristate "Dallas 2780 battery monitor chip" + depends on W1 + help + If you enable this you will have the DS2780 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 diff --git a/drivers/w1/slaves/Makefile b/drivers/w1/slaves/Makefile index 75e3913..1f31e9f 100644 --- a/drivers/w1/slaves/Makefile +++ b/drivers/w1/slaves/Makefile @@ -9,4 +9,5 @@ obj-$(CONFIG_W1_SLAVE_DS2423) += w1_ds2423.o 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_BQ27000) += w1_bq27000.o diff --git a/drivers/w1/slaves/w1_ds2780.c b/drivers/w1/slaves/w1_ds2780.c new file mode 100644 index 0000000..274c8f3 --- /dev/null +++ b/drivers/w1/slaves/w1_ds2780.c @@ -0,0 +1,217 @@ +/* + * 1-Wire implementation for the ds2780 chip + * + * Copyright (C) 2010 Indesign, LLC + * + * Author: Clifton Barnes <cabarnes@indesign-llc.com> + * + * 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. + * + */ + +#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_ds2780.h" + +int w1_ds2780_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 -ENODEV; + + mutex_lock(&sl->master->mutex); + + if (addr > DS2780_DATA_SIZE || addr < 0) { + count = 0; + goto out; + } + count = min_t(int, count, DS2780_DATA_SIZE - addr); + + if (w1_reset_select_slave(sl) == 0) { + if (io) { + w1_write_8(sl->master, W1_DS2780_WRITE_DATA); + w1_write_8(sl->master, addr); + w1_write_block(sl->master, buf, count); + /* XXX w1_write_block returns void, not n_written */ + } else { + w1_write_8(sl->master, W1_DS2780_READ_DATA); + w1_write_8(sl->master, addr); + count = w1_read_block(sl->master, buf, count); + } + } + +out: + mutex_unlock(&sl->master->mutex); + + return count; +} +EXPORT_SYMBOL(w1_ds2780_io); + +int w1_ds2780_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_ds2780_eeprom_cmd); + +static ssize_t w1_ds2780_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_ds2780_io(dev, buf, off, count, 0); +} + +static struct bin_attribute w1_ds2780_bin_attr = { + .attr = { + .name = "w1_slave", + .mode = S_IRUGO, + }, + .size = DS2780_DATA_SIZE, + .read = w1_ds2780_read_bin, +}; + +static DEFINE_IDR(bat_idr); +static DEFINE_MUTEX(bat_idr_lock); + +static int new_bat_id(void) +{ + int ret; + + while (1) { + int id; + + ret = idr_pre_get(&bat_idr, GFP_KERNEL); + if (ret == 0) + return -ENOMEM; + + mutex_lock(&bat_idr_lock); + ret = idr_get_new(&bat_idr, NULL, &id); + mutex_unlock(&bat_idr_lock); + + if (ret == 0) { + ret = id & MAX_ID_MASK; + break; + } else if (ret == -EAGAIN) { + continue; + } else { + break; + } + } + + return ret; +} + +static void release_bat_id(int id) +{ + mutex_lock(&bat_idr_lock); + idr_remove(&bat_idr, id); + mutex_unlock(&bat_idr_lock); +} + +static int w1_ds2780_add_slave(struct w1_slave *sl) +{ + int ret; + int id; + struct platform_device *pdev; + + id = new_bat_id(); + if (id < 0) { + ret = id; + goto noid; + } + + pdev = platform_device_alloc("ds2780-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_ds2780_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: + release_bat_id(id); +noid: + return ret; +} + +static void w1_ds2780_remove_slave(struct w1_slave *sl) +{ + struct platform_device *pdev = dev_get_drvdata(&sl->dev); + int id = pdev->id; + + platform_device_unregister(pdev); + release_bat_id(id); + sysfs_remove_bin_file(&sl->dev.kobj, &w1_ds2780_bin_attr); +} + +static struct w1_family_ops w1_ds2780_fops = { + .add_slave = w1_ds2780_add_slave, + .remove_slave = w1_ds2780_remove_slave, +}; + +static struct w1_family w1_ds2780_family = { + .fid = W1_FAMILY_DS2780, + .fops = &w1_ds2780_fops, +}; + +static int __init w1_ds2780_init(void) +{ + idr_init(&bat_idr); + return w1_register_family(&w1_ds2780_family); +} + +static void __exit w1_ds2780_exit(void) +{ + w1_unregister_family(&w1_ds2780_family); + idr_destroy(&bat_idr); +} + +module_init(w1_ds2780_init); +module_exit(w1_ds2780_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>"); +MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC"); diff --git a/drivers/w1/slaves/w1_ds2780.h b/drivers/w1/slaves/w1_ds2780.h new file mode 100644 index 0000000..a1fba79 --- /dev/null +++ b/drivers/w1/slaves/w1_ds2780.h @@ -0,0 +1,129 @@ +/* + * 1-Wire implementation for the ds2780 chip + * + * Copyright (C) 2010 Indesign, LLC + * + * Author: Clifton Barnes <cabarnes@indesign-llc.com> + * + * 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_DS2780_H +#define _W1_DS2780_H + +/* Function commands */ +#define W1_DS2780_READ_DATA 0x69 +#define W1_DS2780_WRITE_DATA 0x6C +#define W1_DS2780_COPY_DATA 0x48 +#define W1_DS2780_RECALL_DATA 0xB8 +#define W1_DS2780_LOCK 0x6A + +/* Register map */ +/* Register 0x00 Reserved */ +#define DS2780_STATUS_REG 0x01 +#define DS2780_RAAC_MSB_REG 0x02 +#define DS2780_RAAC_LSB_REG 0x03 +#define DS2780_RSAC_MSB_REG 0x04 +#define DS2780_RSAC_LSB_REG 0x05 +#define DS2780_RARC_REG 0x06 +#define DS2780_RSRC_REG 0x07 +#define DS2780_IAVG_MSB_REG 0x08 +#define DS2780_IAVG_LSB_REG 0x09 +#define DS2780_TEMP_MSB_REG 0x0A +#define DS2780_TEMP_LSB_REG 0x0B +#define DS2780_VOLT_MSB_REG 0x0C +#define DS2780_VOLT_LSB_REG 0x0D +#define DS2780_CURRENT_MSB_REG 0x0E +#define DS2780_CURRENT_LSB_REG 0x0F +#define DS2780_ACR_MSB_REG 0x10 +#define DS2780_ACR_LSB_REG 0x11 +#define DS2780_ACRL_MSB_REG 0x12 +#define DS2780_ACRL_LSB_REG 0x13 +#define DS2780_AS_REG 0x14 +#define DS2780_SFR_REG 0x15 +#define DS2780_FULL_MSB_REG 0x16 +#define DS2780_FULL_LSB_REG 0x17 +#define DS2780_AE_MSB_REG 0x18 +#define DS2780_AE_LSB_REG 0x19 +#define DS2780_SE_MSB_REG 0x1A +#define DS2780_SE_LSB_REG 0x1B +/* Register 0x1C - 0x1E Reserved */ +#define DS2780_EEPROM_REG 0x1F +#define DS2780_EEPROM_BLOCK0_START 0x20 +/* Register 0x20 - 0x2F User EEPROM */ +#define DS2780_EEPROM_BLOCK0_END 0x2F +/* Register 0x30 - 0x5F Reserved */ +#define DS2780_EEPROM_BLOCK1_START 0x60 +#define DS2780_CONTROL_REG 0x60 +#define DS2780_AB_REG 0x61 +#define DS2780_AC_MSB_REG 0x62 +#define DS2780_AC_LSB_REG 0x63 +#define DS2780_VCHG_REG 0x64 +#define DS2780_IMIN_REG 0x65 +#define DS2780_VAE_REG 0x66 +#define DS2780_IAE_REG 0x67 +#define DS2780_AE_40_REG 0x68 +#define DS2780_RSNSP_REG 0x69 +#define DS2780_FULL_40_MSB_REG 0x6A +#define DS2780_FULL_40_LSB_REG 0x6B +#define DS2780_FULL_3040_SLOPE_REG 0x6C +#define DS2780_FULL_2030_SLOPE_REG 0x6D +#define DS2780_FULL_1020_SLOPE_REG 0x6E +#define DS2780_FULL_0010_SLOPE_REG 0x6F +#define DS2780_AE_3040_SLOPE_REG 0x70 +#define DS2780_AE_2030_SLOPE_REG 0x71 +#define DS2780_AE_1020_SLOPE_REG 0x72 +#define DS2780_AE_0010_SLOPE_REG 0x73 +#define DS2780_SE_3040_SLOPE_REG 0x74 +#define DS2780_SE_2030_SLOPE_REG 0x75 +#define DS2780_SE_1020_SLOPE_REG 0x76 +#define DS2780_SE_0010_SLOPE_REG 0x77 +#define DS2780_RSGAIN_MSB_REG 0x78 +#define DS2780_RSGAIN_LSB_REG 0x79 +#define DS2780_RSTC_REG 0x7A +#define DS2780_FRSGAIN_MSB_REG 0x7B +#define DS2780_FRSGAIN_LSB_REG 0x7C +#define DS2780_EEPROM_BLOCK1_END 0x7C +/* Register 0x7D - 0xFF Reserved */ + +/* Number of valid register addresses */ +#define DS2780_DATA_SIZE 0x80 + +/* Status register bits */ +#define DS2780_STATUS_REG_CHGTF (1 << 7) +#define DS2780_STATUS_REG_AEF (1 << 6) +#define DS2780_STATUS_REG_SEF (1 << 5) +#define DS2780_STATUS_REG_LEARNF (1 << 4) +/* Bit 3 Reserved */ +#define DS2780_STATUS_REG_UVF (1 << 2) +#define DS2780_STATUS_REG_PORF (1 << 1) +/* Bit 0 Reserved */ + +/* Control register bits */ +/* Bit 7 Reserved */ +#define DS2780_CONTROL_REG_UVEN (1 << 6) +#define DS2780_CONTROL_REG_PMOD (1 << 5) +#define DS2780_CONTROL_REG_RNAOP (1 << 4) +/* Bit 0 - 3 Reserved */ + +/* Special feature register bits */ +/* Bit 1 - 7 Reserved */ +#define DS2780_SFR_REG_PIOSC (1 << 0) + +/* EEPROM register bits */ +#define DS2780_EEPROM_REG_EEC (1 << 7) +#define DS2780_EEPROM_REG_LOCK (1 << 6) +/* Bit 2 - 6 Reserved */ +#define DS2780_EEPROM_REG_BL1 (1 << 1) +#define DS2780_EEPROM_REG_BL0 (1 << 0) + +extern int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count, + int io); +extern int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd); + +#endif /* !_W1_DS2780_H */ diff --git a/drivers/w1/w1_family.h b/drivers/w1/w1_family.h index 7513759..97479ae 100644 --- a/drivers/w1/w1_family.h +++ b/drivers/w1/w1_family.h @@ -37,6 +37,7 @@ #define W1_FAMILY_DS2408 0x29 #define W1_EEPROM_DS2431 0x2D #define W1_FAMILY_DS2760 0x30 +#define W1_FAMILY_DS2780 0x32 #define MAXNAMELEN 32 |