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794 lines
19 KiB
794 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* 1-wire client/driver for the Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC |
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* |
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* Author: Renata Sayakhova <[email protected]> |
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* |
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* Based on ds2780_battery drivers |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/param.h> |
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#include <linux/pm.h> |
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#include <linux/platform_device.h> |
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#include <linux/power_supply.h> |
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#include <linux/idr.h> |
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#include <linux/w1.h> |
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#include "../../w1/slaves/w1_ds2781.h" |
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/* Current unit measurement in uA for a 1 milli-ohm sense resistor */ |
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#define DS2781_CURRENT_UNITS 1563 |
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/* Charge unit measurement in uAh for a 1 milli-ohm sense resistor */ |
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#define DS2781_CHARGE_UNITS 6250 |
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/* Number of bytes in user EEPROM space */ |
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#define DS2781_USER_EEPROM_SIZE (DS2781_EEPROM_BLOCK0_END - \ |
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DS2781_EEPROM_BLOCK0_START + 1) |
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/* Number of bytes in parameter EEPROM space */ |
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#define DS2781_PARAM_EEPROM_SIZE (DS2781_EEPROM_BLOCK1_END - \ |
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DS2781_EEPROM_BLOCK1_START + 1) |
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struct ds2781_device_info { |
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struct device *dev; |
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struct power_supply *bat; |
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struct power_supply_desc bat_desc; |
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struct device *w1_dev; |
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}; |
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enum current_types { |
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CURRENT_NOW, |
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CURRENT_AVG, |
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}; |
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static const char model[] = "DS2781"; |
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static const char manufacturer[] = "Maxim/Dallas"; |
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static inline struct ds2781_device_info * |
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to_ds2781_device_info(struct power_supply *psy) |
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{ |
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return power_supply_get_drvdata(psy); |
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} |
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static inline int ds2781_battery_io(struct ds2781_device_info *dev_info, |
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char *buf, int addr, size_t count, int io) |
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{ |
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return w1_ds2781_io(dev_info->w1_dev, buf, addr, count, io); |
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} |
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static int w1_ds2781_read(struct ds2781_device_info *dev_info, char *buf, |
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int addr, size_t count) |
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{ |
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return ds2781_battery_io(dev_info, buf, addr, count, 0); |
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} |
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static inline int ds2781_read8(struct ds2781_device_info *dev_info, u8 *val, |
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int addr) |
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{ |
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return ds2781_battery_io(dev_info, val, addr, sizeof(u8), 0); |
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} |
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static int ds2781_read16(struct ds2781_device_info *dev_info, s16 *val, |
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int addr) |
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{ |
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int ret; |
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u8 raw[2]; |
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ret = ds2781_battery_io(dev_info, raw, addr, sizeof(raw), 0); |
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if (ret < 0) |
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return ret; |
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*val = (raw[0] << 8) | raw[1]; |
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return 0; |
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} |
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static inline int ds2781_read_block(struct ds2781_device_info *dev_info, |
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u8 *val, int addr, size_t count) |
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{ |
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return ds2781_battery_io(dev_info, val, addr, count, 0); |
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} |
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static inline int ds2781_write(struct ds2781_device_info *dev_info, u8 *val, |
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int addr, size_t count) |
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{ |
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return ds2781_battery_io(dev_info, val, addr, count, 1); |
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} |
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static inline int ds2781_store_eeprom(struct device *dev, int addr) |
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{ |
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return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_COPY_DATA); |
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} |
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static inline int ds2781_recall_eeprom(struct device *dev, int addr) |
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{ |
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return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_RECALL_DATA); |
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} |
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static int ds2781_save_eeprom(struct ds2781_device_info *dev_info, int reg) |
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{ |
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int ret; |
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ret = ds2781_store_eeprom(dev_info->w1_dev, reg); |
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if (ret < 0) |
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return ret; |
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ret = ds2781_recall_eeprom(dev_info->w1_dev, reg); |
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if (ret < 0) |
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return ret; |
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return 0; |
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} |
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/* Set sense resistor value in mhos */ |
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static int ds2781_set_sense_register(struct ds2781_device_info *dev_info, |
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u8 conductance) |
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{ |
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int ret; |
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ret = ds2781_write(dev_info, &conductance, |
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DS2781_RSNSP, sizeof(u8)); |
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if (ret < 0) |
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return ret; |
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return ds2781_save_eeprom(dev_info, DS2781_RSNSP); |
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} |
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/* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */ |
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static int ds2781_get_rsgain_register(struct ds2781_device_info *dev_info, |
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u16 *rsgain) |
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{ |
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return ds2781_read16(dev_info, rsgain, DS2781_RSGAIN_MSB); |
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} |
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/* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */ |
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static int ds2781_set_rsgain_register(struct ds2781_device_info *dev_info, |
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u16 rsgain) |
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{ |
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int ret; |
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u8 raw[] = {rsgain >> 8, rsgain & 0xFF}; |
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ret = ds2781_write(dev_info, raw, |
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DS2781_RSGAIN_MSB, sizeof(raw)); |
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if (ret < 0) |
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return ret; |
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return ds2781_save_eeprom(dev_info, DS2781_RSGAIN_MSB); |
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} |
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static int ds2781_get_voltage(struct ds2781_device_info *dev_info, |
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int *voltage_uV) |
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{ |
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int ret; |
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char val[2]; |
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int voltage_raw; |
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ret = w1_ds2781_read(dev_info, val, DS2781_VOLT_MSB, 2 * sizeof(u8)); |
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if (ret < 0) |
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return ret; |
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/* |
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* The voltage value is located in 10 bits across the voltage MSB |
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* and LSB registers in two's complement form |
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* Sign bit of the voltage value is in bit 7 of the voltage MSB register |
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* Bits 9 - 3 of the voltage value are in bits 6 - 0 of the |
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* voltage MSB register |
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* Bits 2 - 0 of the voltage value are in bits 7 - 5 of the |
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* voltage LSB register |
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*/ |
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voltage_raw = (val[0] << 3) | |
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(val[1] >> 5); |
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/* DS2781 reports voltage in units of 9.76mV, but the battery class |
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* reports in units of uV, so convert by multiplying by 9760. */ |
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*voltage_uV = voltage_raw * 9760; |
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return 0; |
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} |
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static int ds2781_get_temperature(struct ds2781_device_info *dev_info, |
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int *temp) |
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{ |
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int ret; |
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char val[2]; |
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int temp_raw; |
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ret = w1_ds2781_read(dev_info, val, DS2781_TEMP_MSB, 2 * sizeof(u8)); |
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if (ret < 0) |
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return ret; |
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/* |
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* The temperature value is located in 10 bits across the temperature |
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* MSB and LSB registers in two's complement form |
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* Sign bit of the temperature value is in bit 7 of the temperature |
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* MSB register |
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* Bits 9 - 3 of the temperature value are in bits 6 - 0 of the |
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* temperature MSB register |
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* Bits 2 - 0 of the temperature value are in bits 7 - 5 of the |
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* temperature LSB register |
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*/ |
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temp_raw = ((val[0]) << 3) | |
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(val[1] >> 5); |
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*temp = temp_raw + (temp_raw / 4); |
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return 0; |
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} |
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static int ds2781_get_current(struct ds2781_device_info *dev_info, |
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enum current_types type, int *current_uA) |
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{ |
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int ret, sense_res; |
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s16 current_raw; |
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u8 sense_res_raw, reg_msb; |
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/* |
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* The units of measurement for current are dependent on the value of |
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* the sense resistor. |
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*/ |
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ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP); |
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if (ret < 0) |
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return ret; |
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if (sense_res_raw == 0) { |
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dev_err(dev_info->dev, "sense resistor value is 0\n"); |
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return -EINVAL; |
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} |
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sense_res = 1000 / sense_res_raw; |
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if (type == CURRENT_NOW) |
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reg_msb = DS2781_CURRENT_MSB; |
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else if (type == CURRENT_AVG) |
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reg_msb = DS2781_IAVG_MSB; |
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else |
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return -EINVAL; |
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/* |
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* The current value is located in 16 bits across the current MSB |
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* and LSB registers in two's complement form |
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* Sign bit of the current value is in bit 7 of the current MSB register |
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* Bits 14 - 8 of the current value are in bits 6 - 0 of the current |
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* MSB register |
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* Bits 7 - 0 of the current value are in bits 7 - 0 of the current |
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* LSB register |
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*/ |
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ret = ds2781_read16(dev_info, ¤t_raw, reg_msb); |
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if (ret < 0) |
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return ret; |
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*current_uA = current_raw * (DS2781_CURRENT_UNITS / sense_res); |
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return 0; |
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} |
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static int ds2781_get_accumulated_current(struct ds2781_device_info *dev_info, |
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int *accumulated_current) |
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{ |
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int ret, sense_res; |
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s16 current_raw; |
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u8 sense_res_raw; |
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/* |
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* The units of measurement for accumulated current are dependent on |
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* the value of the sense resistor. |
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*/ |
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ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP); |
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if (ret < 0) |
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return ret; |
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if (sense_res_raw == 0) { |
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dev_err(dev_info->dev, "sense resistor value is 0\n"); |
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return -EINVAL; |
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} |
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sense_res = 1000 / sense_res_raw; |
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/* |
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* The ACR value is located in 16 bits across the ACR MSB and |
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* LSB registers |
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* Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR |
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* MSB register |
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* Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR |
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* LSB register |
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*/ |
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ret = ds2781_read16(dev_info, ¤t_raw, DS2781_ACR_MSB); |
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if (ret < 0) |
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return ret; |
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*accumulated_current = current_raw * (DS2781_CHARGE_UNITS / sense_res); |
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return 0; |
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} |
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static int ds2781_get_capacity(struct ds2781_device_info *dev_info, |
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int *capacity) |
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{ |
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int ret; |
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u8 raw; |
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ret = ds2781_read8(dev_info, &raw, DS2781_RARC); |
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if (ret < 0) |
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return ret; |
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*capacity = raw; |
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return 0; |
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} |
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static int ds2781_get_status(struct ds2781_device_info *dev_info, int *status) |
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{ |
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int ret, current_uA, capacity; |
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ret = ds2781_get_current(dev_info, CURRENT_NOW, ¤t_uA); |
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if (ret < 0) |
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return ret; |
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ret = ds2781_get_capacity(dev_info, &capacity); |
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if (ret < 0) |
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return ret; |
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if (power_supply_am_i_supplied(dev_info->bat)) { |
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if (capacity == 100) |
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*status = POWER_SUPPLY_STATUS_FULL; |
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else if (current_uA > 50000) |
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*status = POWER_SUPPLY_STATUS_CHARGING; |
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else |
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*status = POWER_SUPPLY_STATUS_NOT_CHARGING; |
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} else { |
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*status = POWER_SUPPLY_STATUS_DISCHARGING; |
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} |
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return 0; |
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} |
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static int ds2781_get_charge_now(struct ds2781_device_info *dev_info, |
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int *charge_now) |
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{ |
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int ret; |
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u16 charge_raw; |
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/* |
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* The RAAC value is located in 16 bits across the RAAC MSB and |
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* LSB registers |
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* Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC |
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* MSB register |
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* Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC |
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* LSB register |
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*/ |
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ret = ds2781_read16(dev_info, &charge_raw, DS2781_RAAC_MSB); |
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if (ret < 0) |
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return ret; |
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*charge_now = charge_raw * 1600; |
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return 0; |
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} |
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static int ds2781_get_control_register(struct ds2781_device_info *dev_info, |
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u8 *control_reg) |
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{ |
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return ds2781_read8(dev_info, control_reg, DS2781_CONTROL); |
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} |
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static int ds2781_set_control_register(struct ds2781_device_info *dev_info, |
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u8 control_reg) |
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{ |
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int ret; |
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ret = ds2781_write(dev_info, &control_reg, |
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DS2781_CONTROL, sizeof(u8)); |
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if (ret < 0) |
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return ret; |
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return ds2781_save_eeprom(dev_info, DS2781_CONTROL); |
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} |
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static int ds2781_battery_get_property(struct power_supply *psy, |
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enum power_supply_property psp, |
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union power_supply_propval *val) |
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{ |
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int ret = 0; |
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struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
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switch (psp) { |
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case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
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ret = ds2781_get_voltage(dev_info, &val->intval); |
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break; |
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case POWER_SUPPLY_PROP_TEMP: |
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ret = ds2781_get_temperature(dev_info, &val->intval); |
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break; |
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case POWER_SUPPLY_PROP_MODEL_NAME: |
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val->strval = model; |
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break; |
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case POWER_SUPPLY_PROP_MANUFACTURER: |
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val->strval = manufacturer; |
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break; |
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case POWER_SUPPLY_PROP_CURRENT_NOW: |
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ret = ds2781_get_current(dev_info, CURRENT_NOW, &val->intval); |
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break; |
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case POWER_SUPPLY_PROP_CURRENT_AVG: |
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ret = ds2781_get_current(dev_info, CURRENT_AVG, &val->intval); |
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break; |
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case POWER_SUPPLY_PROP_STATUS: |
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ret = ds2781_get_status(dev_info, &val->intval); |
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break; |
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case POWER_SUPPLY_PROP_CAPACITY: |
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ret = ds2781_get_capacity(dev_info, &val->intval); |
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break; |
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case POWER_SUPPLY_PROP_CHARGE_COUNTER: |
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ret = ds2781_get_accumulated_current(dev_info, &val->intval); |
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break; |
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case POWER_SUPPLY_PROP_CHARGE_NOW: |
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ret = ds2781_get_charge_now(dev_info, &val->intval); |
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break; |
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default: |
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ret = -EINVAL; |
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} |
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return ret; |
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} |
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static enum power_supply_property ds2781_battery_props[] = { |
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POWER_SUPPLY_PROP_STATUS, |
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POWER_SUPPLY_PROP_VOLTAGE_NOW, |
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POWER_SUPPLY_PROP_TEMP, |
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POWER_SUPPLY_PROP_MODEL_NAME, |
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POWER_SUPPLY_PROP_MANUFACTURER, |
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POWER_SUPPLY_PROP_CURRENT_NOW, |
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POWER_SUPPLY_PROP_CURRENT_AVG, |
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POWER_SUPPLY_PROP_CAPACITY, |
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POWER_SUPPLY_PROP_CHARGE_COUNTER, |
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POWER_SUPPLY_PROP_CHARGE_NOW, |
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}; |
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static ssize_t ds2781_get_pmod_enabled(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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int ret; |
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u8 control_reg; |
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struct power_supply *psy = to_power_supply(dev); |
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struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
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/* Get power mode */ |
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ret = ds2781_get_control_register(dev_info, &control_reg); |
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if (ret < 0) |
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return ret; |
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return sprintf(buf, "%d\n", |
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!!(control_reg & DS2781_CONTROL_PMOD)); |
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} |
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static ssize_t ds2781_set_pmod_enabled(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, |
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size_t count) |
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{ |
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int ret; |
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u8 control_reg, new_setting; |
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struct power_supply *psy = to_power_supply(dev); |
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struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
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/* Set power mode */ |
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ret = ds2781_get_control_register(dev_info, &control_reg); |
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if (ret < 0) |
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return ret; |
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ret = kstrtou8(buf, 0, &new_setting); |
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if (ret < 0) |
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return ret; |
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if ((new_setting != 0) && (new_setting != 1)) { |
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dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n"); |
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return -EINVAL; |
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} |
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if (new_setting) |
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control_reg |= DS2781_CONTROL_PMOD; |
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else |
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control_reg &= ~DS2781_CONTROL_PMOD; |
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ret = ds2781_set_control_register(dev_info, control_reg); |
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if (ret < 0) |
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return ret; |
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return count; |
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} |
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static ssize_t ds2781_get_sense_resistor_value(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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int ret; |
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u8 sense_resistor; |
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struct power_supply *psy = to_power_supply(dev); |
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struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
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ret = ds2781_read8(dev_info, &sense_resistor, DS2781_RSNSP); |
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if (ret < 0) |
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return ret; |
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ret = sprintf(buf, "%d\n", sense_resistor); |
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return ret; |
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} |
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static ssize_t ds2781_set_sense_resistor_value(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, |
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size_t count) |
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{ |
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int ret; |
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u8 new_setting; |
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struct power_supply *psy = to_power_supply(dev); |
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struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
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ret = kstrtou8(buf, 0, &new_setting); |
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if (ret < 0) |
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return ret; |
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ret = ds2781_set_sense_register(dev_info, new_setting); |
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if (ret < 0) |
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return ret; |
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return count; |
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} |
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static ssize_t ds2781_get_rsgain_setting(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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int ret; |
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u16 rsgain; |
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struct power_supply *psy = to_power_supply(dev); |
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struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
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ret = ds2781_get_rsgain_register(dev_info, &rsgain); |
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if (ret < 0) |
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return ret; |
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return sprintf(buf, "%d\n", rsgain); |
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} |
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static ssize_t ds2781_set_rsgain_setting(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, |
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size_t count) |
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{ |
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int ret; |
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u16 new_setting; |
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struct power_supply *psy = to_power_supply(dev); |
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struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
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ret = kstrtou16(buf, 0, &new_setting); |
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if (ret < 0) |
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return ret; |
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|
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/* 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); |
|
|
|
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; |
|
|
|
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); |
|
|
|
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; |
|
|
|
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_sysfs_attrs[] = { |
|
&dev_attr_pmod_enabled.attr, |
|
&dev_attr_sense_resistor_value.attr, |
|
&dev_attr_rsgain_setting.attr, |
|
&dev_attr_pio_pin.attr, |
|
NULL |
|
}; |
|
|
|
static struct bin_attribute *ds2781_sysfs_bin_attrs[] = { |
|
&ds2781_param_eeprom_bin_attr, |
|
&ds2781_user_eeprom_bin_attr, |
|
NULL, |
|
}; |
|
|
|
static const struct attribute_group ds2781_sysfs_group = { |
|
.attrs = ds2781_sysfs_attrs, |
|
.bin_attrs = ds2781_sysfs_bin_attrs, |
|
|
|
}; |
|
|
|
static const struct attribute_group *ds2781_sysfs_groups[] = { |
|
&ds2781_sysfs_group, |
|
NULL, |
|
}; |
|
|
|
static int ds2781_battery_probe(struct platform_device *pdev) |
|
{ |
|
struct power_supply_config psy_cfg = {}; |
|
struct ds2781_device_info *dev_info; |
|
|
|
dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL); |
|
if (!dev_info) |
|
return -ENOMEM; |
|
|
|
platform_set_drvdata(pdev, dev_info); |
|
|
|
dev_info->dev = &pdev->dev; |
|
dev_info->w1_dev = pdev->dev.parent; |
|
dev_info->bat_desc.name = dev_name(&pdev->dev); |
|
dev_info->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; |
|
dev_info->bat_desc.properties = ds2781_battery_props; |
|
dev_info->bat_desc.num_properties = ARRAY_SIZE(ds2781_battery_props); |
|
dev_info->bat_desc.get_property = ds2781_battery_get_property; |
|
|
|
psy_cfg.drv_data = dev_info; |
|
psy_cfg.attr_grp = ds2781_sysfs_groups; |
|
|
|
dev_info->bat = devm_power_supply_register(&pdev->dev, |
|
&dev_info->bat_desc, |
|
&psy_cfg); |
|
if (IS_ERR(dev_info->bat)) { |
|
dev_err(dev_info->dev, "failed to register battery\n"); |
|
return PTR_ERR(dev_info->bat); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static struct platform_driver ds2781_battery_driver = { |
|
.driver = { |
|
.name = "ds2781-battery", |
|
}, |
|
.probe = ds2781_battery_probe, |
|
}; |
|
module_platform_driver(ds2781_battery_driver); |
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_AUTHOR("Renata Sayakhova <[email protected]>"); |
|
MODULE_DESCRIPTION("Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC driver"); |
|
MODULE_ALIAS("platform:ds2781-battery"); |
|
|
|
|