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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/power/ds2781_battery.c
Initial import
Diffstat (limited to 'drivers/power/ds2781_battery.c')
-rw-r--r--drivers/power/ds2781_battery.c847
1 files changed, 847 insertions, 0 deletions
diff --git a/drivers/power/ds2781_battery.c b/drivers/power/ds2781_battery.c
new file mode 100644
index 000000000..56d583dae
--- /dev/null
+++ b/drivers/power/ds2781_battery.c
@@ -0,0 +1,847 @@
+/*
+ * 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 power_supply_desc bat_desc;
+ struct device *w1_dev;
+};
+
+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 power_supply_get_drvdata(psy);
+}
+
+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)
+{
+ 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, &current_raw, reg_msb);
+ if (ret < 0)
+ return ret;
+
+ *current_uA = current_raw * (DS2781_CURRENT_UNITS / sense_res);
+ return 0;
+}
+
+static int ds2781_get_accumulated_current(struct ds2781_device_info *dev_info,
+ int *accumulated_current)
+{
+ int ret, sense_res;
+ s16 current_raw;
+ u8 sense_res_raw;
+
+ /*
+ * The units of measurement for accumulated current are dependent on
+ * the value of the sense resistor.
+ */
+ ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);
+ if (ret < 0)
+ return ret;
+
+ if (sense_res_raw == 0) {
+ dev_err(dev_info->dev, "sense resistor value is 0\n");
+ return -EINVAL;
+ }
+ sense_res = 1000 / sense_res_raw;
+
+ /*
+ * The ACR value is located in 16 bits across the ACR MSB and
+ * LSB registers
+ * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR
+ * MSB register
+ * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR
+ * LSB register
+ */
+ ret = ds2781_read16(dev_info, &current_raw, DS2781_ACR_MSB);
+ if (ret < 0)
+ return ret;
+
+ *accumulated_current = current_raw * (DS2781_CHARGE_UNITS / sense_res);
+ return 0;
+}
+
+static int ds2781_get_capacity(struct ds2781_device_info *dev_info,
+ int *capacity)
+{
+ int ret;
+ u8 raw;
+
+ ret = ds2781_read8(dev_info, &raw, DS2781_RARC);
+ if (ret < 0)
+ return ret;
+
+ *capacity = raw;
+ return 0;
+}
+
+static int ds2781_get_status(struct ds2781_device_info *dev_info, int *status)
+{
+ int ret, current_uA, capacity;
+
+ ret = ds2781_get_current(dev_info, CURRENT_NOW, &current_uA);
+ if (ret < 0)
+ return ret;
+
+ ret = ds2781_get_capacity(dev_info, &capacity);
+ if (ret < 0)
+ return ret;
+
+ if (power_supply_am_i_supplied(dev_info->bat)) {
+ if (capacity == 100)
+ *status = POWER_SUPPLY_STATUS_FULL;
+ else if (current_uA > 50000)
+ *status = POWER_SUPPLY_STATUS_CHARGING;
+ else
+ *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ } else {
+ *status = POWER_SUPPLY_STATUS_DISCHARGING;
+ }
+ return 0;
+}
+
+static int ds2781_get_charge_now(struct ds2781_device_info *dev_info,
+ int *charge_now)
+{
+ int ret;
+ u16 charge_raw;
+
+ /*
+ * The RAAC value is located in 16 bits across the RAAC MSB and
+ * LSB registers
+ * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC
+ * MSB register
+ * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC
+ * LSB register
+ */
+ ret = ds2781_read16(dev_info, &charge_raw, DS2781_RAAC_MSB);
+ if (ret < 0)
+ return ret;
+
+ *charge_now = charge_raw * 1600;
+ return 0;
+}
+
+static int ds2781_get_control_register(struct ds2781_device_info *dev_info,
+ u8 *control_reg)
+{
+ return ds2781_read8(dev_info, control_reg, DS2781_CONTROL);
+}
+
+static int ds2781_set_control_register(struct ds2781_device_info *dev_info,
+ u8 control_reg)
+{
+ int ret;
+
+ ret = ds2781_write(dev_info, &control_reg,
+ DS2781_CONTROL, sizeof(u8));
+ if (ret < 0)
+ return ret;
+
+ return ds2781_save_eeprom(dev_info, DS2781_CONTROL);
+}
+
+static int ds2781_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ int ret = 0;
+ struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ ret = ds2781_get_voltage(dev_info, &val->intval);
+ break;
+
+ case POWER_SUPPLY_PROP_TEMP:
+ ret = ds2781_get_temperature(dev_info, &val->intval);
+ break;
+
+ case POWER_SUPPLY_PROP_MODEL_NAME:
+ val->strval = model;
+ break;
+
+ case POWER_SUPPLY_PROP_MANUFACTURER:
+ val->strval = manufacturer;
+ break;
+
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ ret = ds2781_get_current(dev_info, CURRENT_NOW, &val->intval);
+ break;
+
+ case POWER_SUPPLY_PROP_CURRENT_AVG:
+ ret = ds2781_get_current(dev_info, CURRENT_AVG, &val->intval);
+ break;
+
+ case POWER_SUPPLY_PROP_STATUS:
+ ret = ds2781_get_status(dev_info, &val->intval);
+ break;
+
+ case POWER_SUPPLY_PROP_CAPACITY:
+ ret = ds2781_get_capacity(dev_info, &val->intval);
+ break;
+
+ case POWER_SUPPLY_PROP_CHARGE_COUNTER:
+ ret = ds2781_get_accumulated_current(dev_info, &val->intval);
+ break;
+
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ ret = ds2781_get_charge_now(dev_info, &val->intval);
+ break;
+
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static enum power_supply_property ds2781_battery_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_TEMP,
+ POWER_SUPPLY_PROP_MODEL_NAME,
+ POWER_SUPPLY_PROP_MANUFACTURER,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CURRENT_AVG,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_CHARGE_COUNTER,
+ POWER_SUPPLY_PROP_CHARGE_NOW,
+};
+
+static ssize_t ds2781_get_pmod_enabled(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ u8 control_reg;
+ struct power_supply *psy = to_power_supply(dev);
+ struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
+
+ /* Get power mode */
+ ret = ds2781_get_control_register(dev_info, &control_reg);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%d\n",
+ !!(control_reg & DS2781_CONTROL_PMOD));
+}
+
+static ssize_t ds2781_set_pmod_enabled(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ int ret;
+ u8 control_reg, new_setting;
+ struct power_supply *psy = to_power_supply(dev);
+ struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
+
+ /* Set power mode */
+ ret = ds2781_get_control_register(dev_info, &control_reg);
+ if (ret < 0)
+ return ret;
+
+ ret = kstrtou8(buf, 0, &new_setting);
+ if (ret < 0)
+ return ret;
+
+ if ((new_setting != 0) && (new_setting != 1)) {
+ dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");
+ return -EINVAL;
+ }
+
+ if (new_setting)
+ control_reg |= DS2781_CONTROL_PMOD;
+ else
+ control_reg &= ~DS2781_CONTROL_PMOD;
+
+ ret = ds2781_set_control_register(dev_info, control_reg);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static ssize_t ds2781_get_sense_resistor_value(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ u8 sense_resistor;
+ struct power_supply *psy = to_power_supply(dev);
+ struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
+
+ ret = ds2781_read8(dev_info, &sense_resistor, DS2781_RSNSP);
+ if (ret < 0)
+ return ret;
+
+ ret = sprintf(buf, "%d\n", sense_resistor);
+ return ret;
+}
+
+static ssize_t ds2781_set_sense_resistor_value(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ int ret;
+ u8 new_setting;
+ struct power_supply *psy = to_power_supply(dev);
+ struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
+
+ ret = kstrtou8(buf, 0, &new_setting);
+ if (ret < 0)
+ return ret;
+
+ ret = ds2781_set_sense_register(dev_info, new_setting);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static ssize_t ds2781_get_rsgain_setting(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ u16 rsgain;
+ struct power_supply *psy = to_power_supply(dev);
+ struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
+
+ ret = ds2781_get_rsgain_register(dev_info, &rsgain);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%d\n", rsgain);
+}
+
+static ssize_t ds2781_set_rsgain_setting(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ int ret;
+ u16 new_setting;
+ struct power_supply *psy = to_power_supply(dev);
+ struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
+
+ ret = kstrtou16(buf, 0, &new_setting);
+ if (ret < 0)
+ return ret;
+
+ /* Gain can only be from 0 to 1.999 in steps of .001 */
+ if (new_setting > 1999) {
+ dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");
+ return -EINVAL;
+ }
+
+ ret = ds2781_set_rsgain_register(dev_info, new_setting);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static ssize_t ds2781_get_pio_pin(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ u8 sfr;
+ struct power_supply *psy = to_power_supply(dev);
+ struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
+
+ ret = ds2781_read8(dev_info, &sfr, DS2781_SFR);
+ if (ret < 0)
+ return ret;
+
+ ret = sprintf(buf, "%d\n", sfr & DS2781_SFR_PIOSC);
+ return ret;
+}
+
+static ssize_t ds2781_set_pio_pin(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ int ret;
+ u8 new_setting;
+ struct power_supply *psy = to_power_supply(dev);
+ struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
+
+ ret = kstrtou8(buf, 0, &new_setting);
+ if (ret < 0)
+ return ret;
+
+ if ((new_setting != 0) && (new_setting != 1)) {
+ dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");
+ return -EINVAL;
+ }
+
+ ret = ds2781_write(dev_info, &new_setting,
+ DS2781_SFR, sizeof(u8));
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static ssize_t ds2781_read_param_eeprom_bin(struct file *filp,
+ struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t off, size_t count)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct power_supply *psy = to_power_supply(dev);
+ struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
+
+ count = min_t(loff_t, count, DS2781_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 ds2781_battery_probe(struct platform_device *pdev)
+{
+ struct power_supply_config psy_cfg = {};
+ int ret = 0;
+ 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;
+
+ dev_info->bat = 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");
+ ret = PTR_ERR(dev_info->bat);
+ goto fail;
+ }
+
+ 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;
+ }
+
+ 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:
+ return ret;
+}
+
+static int ds2781_battery_remove(struct platform_device *pdev)
+{
+ struct ds2781_device_info *dev_info = platform_get_drvdata(pdev);
+
+ /*
+ * Remove attributes before unregistering power supply
+ * because 'bat' will be freed on power_supply_unregister() call.
+ */
+ sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2781_attr_group);
+
+ power_supply_unregister(dev_info->bat);
+
+ return 0;
+}
+
+static struct platform_driver ds2781_battery_driver = {
+ .driver = {
+ .name = "ds2781-battery",
+ },
+ .probe = ds2781_battery_probe,
+ .remove = ds2781_battery_remove,
+};
+module_platform_driver(ds2781_battery_driver);
+
+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");
+