| /* |
| * 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); |
| } |
| |
| static 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, ¤t_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, ¤t_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, ¤t_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_PARAM_EEPROM_SIZE - 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_PARAM_EEPROM_SIZE - 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_PARAM_EEPROM_SIZE, |
| .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_USER_EEPROM_SIZE - 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_USER_EEPROM_SIZE - 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_USER_EEPROM_SIZE, |
| .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"); |
| |