| /* |
| * Fuel gauge driver for Maxim 17042 / 8966 / 8997 |
| * Note that Maxim 8966 and 8997 are mfd and this is its subdevice. |
| * |
| * Copyright (C) 2011 Samsung Electronics |
| * MyungJoo Ham <myungjoo.ham@samsung.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| * This driver is based on max17040_battery.c |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/i2c.h> |
| #include <linux/delay.h> |
| #include <linux/interrupt.h> |
| #include <linux/mod_devicetable.h> |
| #include <linux/power_supply.h> |
| #include <linux/power/max17042_battery.h> |
| #include <linux/of.h> |
| |
| /* Status register bits */ |
| #define STATUS_POR_BIT (1 << 1) |
| #define STATUS_BST_BIT (1 << 3) |
| #define STATUS_VMN_BIT (1 << 8) |
| #define STATUS_TMN_BIT (1 << 9) |
| #define STATUS_SMN_BIT (1 << 10) |
| #define STATUS_BI_BIT (1 << 11) |
| #define STATUS_VMX_BIT (1 << 12) |
| #define STATUS_TMX_BIT (1 << 13) |
| #define STATUS_SMX_BIT (1 << 14) |
| #define STATUS_BR_BIT (1 << 15) |
| |
| /* Interrupt mask bits */ |
| #define CONFIG_ALRT_BIT_ENBL (1 << 2) |
| #define STATUS_INTR_SOCMIN_BIT (1 << 10) |
| #define STATUS_INTR_SOCMAX_BIT (1 << 14) |
| |
| #define VFSOC0_LOCK 0x0000 |
| #define VFSOC0_UNLOCK 0x0080 |
| #define MODEL_UNLOCK1 0X0059 |
| #define MODEL_UNLOCK2 0X00C4 |
| #define MODEL_LOCK1 0X0000 |
| #define MODEL_LOCK2 0X0000 |
| |
| #define dQ_ACC_DIV 0x4 |
| #define dP_ACC_100 0x1900 |
| #define dP_ACC_200 0x3200 |
| |
| struct max17042_chip { |
| struct i2c_client *client; |
| struct power_supply battery; |
| struct max17042_platform_data *pdata; |
| struct work_struct work; |
| int init_complete; |
| }; |
| |
| static int max17042_write_reg(struct i2c_client *client, u8 reg, u16 value) |
| { |
| int ret = i2c_smbus_write_word_data(client, reg, value); |
| |
| if (ret < 0) |
| dev_err(&client->dev, "%s: err %d\n", __func__, ret); |
| |
| return ret; |
| } |
| |
| static int max17042_read_reg(struct i2c_client *client, u8 reg) |
| { |
| int ret = i2c_smbus_read_word_data(client, reg); |
| |
| if (ret < 0) |
| dev_err(&client->dev, "%s: err %d\n", __func__, ret); |
| |
| return ret; |
| } |
| |
| static void max17042_set_reg(struct i2c_client *client, |
| struct max17042_reg_data *data, int size) |
| { |
| int i; |
| |
| for (i = 0; i < size; i++) |
| max17042_write_reg(client, data[i].addr, data[i].data); |
| } |
| |
| static enum power_supply_property max17042_battery_props[] = { |
| POWER_SUPPLY_PROP_PRESENT, |
| POWER_SUPPLY_PROP_CYCLE_COUNT, |
| POWER_SUPPLY_PROP_VOLTAGE_MAX, |
| POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, |
| POWER_SUPPLY_PROP_VOLTAGE_NOW, |
| POWER_SUPPLY_PROP_VOLTAGE_AVG, |
| POWER_SUPPLY_PROP_VOLTAGE_OCV, |
| POWER_SUPPLY_PROP_CAPACITY, |
| POWER_SUPPLY_PROP_CHARGE_FULL, |
| POWER_SUPPLY_PROP_TEMP, |
| POWER_SUPPLY_PROP_CURRENT_NOW, |
| POWER_SUPPLY_PROP_CURRENT_AVG, |
| }; |
| |
| static int max17042_get_property(struct power_supply *psy, |
| enum power_supply_property psp, |
| union power_supply_propval *val) |
| { |
| struct max17042_chip *chip = container_of(psy, |
| struct max17042_chip, battery); |
| int ret; |
| |
| if (!chip->init_complete) |
| return -EAGAIN; |
| |
| switch (psp) { |
| case POWER_SUPPLY_PROP_PRESENT: |
| ret = max17042_read_reg(chip->client, MAX17042_STATUS); |
| if (ret < 0) |
| return ret; |
| |
| if (ret & MAX17042_STATUS_BattAbsent) |
| val->intval = 0; |
| else |
| val->intval = 1; |
| break; |
| case POWER_SUPPLY_PROP_CYCLE_COUNT: |
| ret = max17042_read_reg(chip->client, MAX17042_Cycles); |
| if (ret < 0) |
| return ret; |
| |
| val->intval = ret; |
| break; |
| case POWER_SUPPLY_PROP_VOLTAGE_MAX: |
| ret = max17042_read_reg(chip->client, MAX17042_MinMaxVolt); |
| if (ret < 0) |
| return ret; |
| |
| val->intval = ret >> 8; |
| val->intval *= 20000; /* Units of LSB = 20mV */ |
| break; |
| case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: |
| ret = max17042_read_reg(chip->client, MAX17042_V_empty); |
| if (ret < 0) |
| return ret; |
| |
| val->intval = ret >> 7; |
| val->intval *= 10000; /* Units of LSB = 10mV */ |
| break; |
| case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
| ret = max17042_read_reg(chip->client, MAX17042_VCELL); |
| if (ret < 0) |
| return ret; |
| |
| val->intval = ret * 625 / 8; |
| break; |
| case POWER_SUPPLY_PROP_VOLTAGE_AVG: |
| ret = max17042_read_reg(chip->client, MAX17042_AvgVCELL); |
| if (ret < 0) |
| return ret; |
| |
| val->intval = ret * 625 / 8; |
| break; |
| case POWER_SUPPLY_PROP_VOLTAGE_OCV: |
| ret = max17042_read_reg(chip->client, MAX17042_OCVInternal); |
| if (ret < 0) |
| return ret; |
| |
| val->intval = ret * 625 / 8; |
| break; |
| case POWER_SUPPLY_PROP_CAPACITY: |
| ret = max17042_read_reg(chip->client, MAX17042_RepSOC); |
| if (ret < 0) |
| return ret; |
| |
| val->intval = ret >> 8; |
| break; |
| case POWER_SUPPLY_PROP_CHARGE_FULL: |
| ret = max17042_read_reg(chip->client, MAX17042_FullCAP); |
| if (ret < 0) |
| return ret; |
| |
| val->intval = ret * 1000 / 2; |
| break; |
| case POWER_SUPPLY_PROP_TEMP: |
| ret = max17042_read_reg(chip->client, MAX17042_TEMP); |
| if (ret < 0) |
| return ret; |
| |
| val->intval = ret; |
| /* The value is signed. */ |
| if (val->intval & 0x8000) { |
| val->intval = (0x7fff & ~val->intval) + 1; |
| val->intval *= -1; |
| } |
| /* The value is converted into deci-centigrade scale */ |
| /* Units of LSB = 1 / 256 degree Celsius */ |
| val->intval = val->intval * 10 / 256; |
| break; |
| case POWER_SUPPLY_PROP_CURRENT_NOW: |
| if (chip->pdata->enable_current_sense) { |
| ret = max17042_read_reg(chip->client, MAX17042_Current); |
| if (ret < 0) |
| return ret; |
| |
| val->intval = ret; |
| if (val->intval & 0x8000) { |
| /* Negative */ |
| val->intval = ~val->intval & 0x7fff; |
| val->intval++; |
| val->intval *= -1; |
| } |
| val->intval *= 1562500 / chip->pdata->r_sns; |
| } else { |
| return -EINVAL; |
| } |
| break; |
| case POWER_SUPPLY_PROP_CURRENT_AVG: |
| if (chip->pdata->enable_current_sense) { |
| ret = max17042_read_reg(chip->client, |
| MAX17042_AvgCurrent); |
| if (ret < 0) |
| return ret; |
| |
| val->intval = ret; |
| if (val->intval & 0x8000) { |
| /* Negative */ |
| val->intval = ~val->intval & 0x7fff; |
| val->intval++; |
| val->intval *= -1; |
| } |
| val->intval *= 1562500 / chip->pdata->r_sns; |
| } else { |
| return -EINVAL; |
| } |
| break; |
| default: |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static int max17042_write_verify_reg(struct i2c_client *client, |
| u8 reg, u16 value) |
| { |
| int retries = 8; |
| int ret; |
| u16 read_value; |
| |
| do { |
| ret = i2c_smbus_write_word_data(client, reg, value); |
| read_value = max17042_read_reg(client, reg); |
| if (read_value != value) { |
| ret = -EIO; |
| retries--; |
| } |
| } while (retries && read_value != value); |
| |
| if (ret < 0) |
| dev_err(&client->dev, "%s: err %d\n", __func__, ret); |
| |
| return ret; |
| } |
| |
| static inline void max17042_override_por( |
| struct i2c_client *client, u8 reg, u16 value) |
| { |
| if (value) |
| max17042_write_reg(client, reg, value); |
| } |
| |
| static inline void max10742_unlock_model(struct max17042_chip *chip) |
| { |
| struct i2c_client *client = chip->client; |
| max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_UNLOCK1); |
| max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_UNLOCK2); |
| } |
| |
| static inline void max10742_lock_model(struct max17042_chip *chip) |
| { |
| struct i2c_client *client = chip->client; |
| max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_LOCK1); |
| max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_LOCK2); |
| } |
| |
| static inline void max17042_write_model_data(struct max17042_chip *chip, |
| u8 addr, int size) |
| { |
| struct i2c_client *client = chip->client; |
| int i; |
| for (i = 0; i < size; i++) |
| max17042_write_reg(client, addr + i, |
| chip->pdata->config_data->cell_char_tbl[i]); |
| } |
| |
| static inline void max17042_read_model_data(struct max17042_chip *chip, |
| u8 addr, u16 *data, int size) |
| { |
| struct i2c_client *client = chip->client; |
| int i; |
| |
| for (i = 0; i < size; i++) |
| data[i] = max17042_read_reg(client, addr + i); |
| } |
| |
| static inline int max17042_model_data_compare(struct max17042_chip *chip, |
| u16 *data1, u16 *data2, int size) |
| { |
| int i; |
| |
| if (memcmp(data1, data2, size)) { |
| dev_err(&chip->client->dev, "%s compare failed\n", __func__); |
| for (i = 0; i < size; i++) |
| dev_info(&chip->client->dev, "0x%x, 0x%x", |
| data1[i], data2[i]); |
| dev_info(&chip->client->dev, "\n"); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static int max17042_init_model(struct max17042_chip *chip) |
| { |
| int ret; |
| int table_size = |
| sizeof(chip->pdata->config_data->cell_char_tbl)/sizeof(u16); |
| u16 *temp_data; |
| |
| temp_data = kzalloc(table_size, GFP_KERNEL); |
| if (!temp_data) |
| return -ENOMEM; |
| |
| max10742_unlock_model(chip); |
| max17042_write_model_data(chip, MAX17042_MODELChrTbl, |
| table_size); |
| max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data, |
| table_size); |
| |
| ret = max17042_model_data_compare( |
| chip, |
| chip->pdata->config_data->cell_char_tbl, |
| temp_data, |
| table_size); |
| |
| max10742_lock_model(chip); |
| kfree(temp_data); |
| |
| return ret; |
| } |
| |
| static int max17042_verify_model_lock(struct max17042_chip *chip) |
| { |
| int i; |
| int table_size = |
| sizeof(chip->pdata->config_data->cell_char_tbl); |
| u16 *temp_data; |
| int ret = 0; |
| |
| temp_data = kzalloc(table_size, GFP_KERNEL); |
| if (!temp_data) |
| return -ENOMEM; |
| |
| max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data, |
| table_size); |
| for (i = 0; i < table_size; i++) |
| if (temp_data[i]) |
| ret = -EINVAL; |
| |
| kfree(temp_data); |
| return ret; |
| } |
| |
| static void max17042_write_config_regs(struct max17042_chip *chip) |
| { |
| struct max17042_config_data *config = chip->pdata->config_data; |
| |
| max17042_write_reg(chip->client, MAX17042_CONFIG, config->config); |
| max17042_write_reg(chip->client, MAX17042_LearnCFG, config->learn_cfg); |
| max17042_write_reg(chip->client, MAX17042_FilterCFG, |
| config->filter_cfg); |
| max17042_write_reg(chip->client, MAX17042_RelaxCFG, config->relax_cfg); |
| } |
| |
| static void max17042_write_custom_regs(struct max17042_chip *chip) |
| { |
| struct max17042_config_data *config = chip->pdata->config_data; |
| |
| max17042_write_verify_reg(chip->client, MAX17042_RCOMP0, |
| config->rcomp0); |
| max17042_write_verify_reg(chip->client, MAX17042_TempCo, |
| config->tcompc0); |
| max17042_write_reg(chip->client, MAX17042_EmptyTempCo, |
| config->empty_tempco); |
| max17042_write_verify_reg(chip->client, MAX17042_K_empty0, |
| config->kempty0); |
| max17042_write_verify_reg(chip->client, MAX17042_ICHGTerm, |
| config->ichgt_term); |
| } |
| |
| static void max17042_update_capacity_regs(struct max17042_chip *chip) |
| { |
| struct max17042_config_data *config = chip->pdata->config_data; |
| |
| max17042_write_verify_reg(chip->client, MAX17042_FullCAP, |
| config->fullcap); |
| max17042_write_reg(chip->client, MAX17042_DesignCap, |
| config->design_cap); |
| max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom, |
| config->fullcapnom); |
| } |
| |
| static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip) |
| { |
| u16 vfSoc; |
| |
| vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC); |
| max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK); |
| max17042_write_verify_reg(chip->client, MAX17042_VFSOC0, vfSoc); |
| max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_LOCK); |
| } |
| |
| static void max17042_load_new_capacity_params(struct max17042_chip *chip) |
| { |
| u16 full_cap0, rep_cap, dq_acc, vfSoc; |
| u32 rem_cap; |
| |
| struct max17042_config_data *config = chip->pdata->config_data; |
| |
| full_cap0 = max17042_read_reg(chip->client, MAX17042_FullCAP0); |
| vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC); |
| |
| /* fg_vfSoc needs to shifted by 8 bits to get the |
| * perc in 1% accuracy, to get the right rem_cap multiply |
| * full_cap0, fg_vfSoc and devide by 100 |
| */ |
| rem_cap = ((vfSoc >> 8) * full_cap0) / 100; |
| max17042_write_verify_reg(chip->client, MAX17042_RemCap, (u16)rem_cap); |
| |
| rep_cap = (u16)rem_cap; |
| max17042_write_verify_reg(chip->client, MAX17042_RepCap, rep_cap); |
| |
| /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */ |
| dq_acc = config->fullcap / dQ_ACC_DIV; |
| max17042_write_verify_reg(chip->client, MAX17042_dQacc, dq_acc); |
| max17042_write_verify_reg(chip->client, MAX17042_dPacc, dP_ACC_200); |
| |
| max17042_write_verify_reg(chip->client, MAX17042_FullCAP, |
| config->fullcap); |
| max17042_write_reg(chip->client, MAX17042_DesignCap, |
| config->design_cap); |
| max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom, |
| config->fullcapnom); |
| } |
| |
| /* |
| * Block write all the override values coming from platform data. |
| * This function MUST be called before the POR initialization proceedure |
| * specified by maxim. |
| */ |
| static inline void max17042_override_por_values(struct max17042_chip *chip) |
| { |
| struct i2c_client *client = chip->client; |
| struct max17042_config_data *config = chip->pdata->config_data; |
| |
| max17042_override_por(client, MAX17042_TGAIN, config->tgain); |
| max17042_override_por(client, MAx17042_TOFF, config->toff); |
| max17042_override_por(client, MAX17042_CGAIN, config->cgain); |
| max17042_override_por(client, MAX17042_COFF, config->coff); |
| |
| max17042_override_por(client, MAX17042_VALRT_Th, config->valrt_thresh); |
| max17042_override_por(client, MAX17042_TALRT_Th, config->talrt_thresh); |
| max17042_override_por(client, MAX17042_SALRT_Th, |
| config->soc_alrt_thresh); |
| max17042_override_por(client, MAX17042_CONFIG, config->config); |
| max17042_override_por(client, MAX17042_SHDNTIMER, config->shdntimer); |
| |
| max17042_override_por(client, MAX17042_DesignCap, config->design_cap); |
| max17042_override_por(client, MAX17042_ICHGTerm, config->ichgt_term); |
| |
| max17042_override_por(client, MAX17042_AtRate, config->at_rate); |
| max17042_override_por(client, MAX17042_LearnCFG, config->learn_cfg); |
| max17042_override_por(client, MAX17042_FilterCFG, config->filter_cfg); |
| max17042_override_por(client, MAX17042_RelaxCFG, config->relax_cfg); |
| max17042_override_por(client, MAX17042_MiscCFG, config->misc_cfg); |
| max17042_override_por(client, MAX17042_MaskSOC, config->masksoc); |
| |
| max17042_override_por(client, MAX17042_FullCAP, config->fullcap); |
| max17042_override_por(client, MAX17042_FullCAPNom, config->fullcapnom); |
| max17042_override_por(client, MAX17042_SOC_empty, config->socempty); |
| max17042_override_por(client, MAX17042_LAvg_empty, config->lavg_empty); |
| max17042_override_por(client, MAX17042_dQacc, config->dqacc); |
| max17042_override_por(client, MAX17042_dPacc, config->dpacc); |
| |
| max17042_override_por(client, MAX17042_V_empty, config->vempty); |
| max17042_override_por(client, MAX17042_TempNom, config->temp_nom); |
| max17042_override_por(client, MAX17042_TempLim, config->temp_lim); |
| max17042_override_por(client, MAX17042_FCTC, config->fctc); |
| max17042_override_por(client, MAX17042_RCOMP0, config->rcomp0); |
| max17042_override_por(client, MAX17042_TempCo, config->tcompc0); |
| max17042_override_por(client, MAX17042_EmptyTempCo, |
| config->empty_tempco); |
| max17042_override_por(client, MAX17042_K_empty0, config->kempty0); |
| } |
| |
| static int max17042_init_chip(struct max17042_chip *chip) |
| { |
| int ret; |
| int val; |
| |
| max17042_override_por_values(chip); |
| /* After Power up, the MAX17042 requires 500mS in order |
| * to perform signal debouncing and initial SOC reporting |
| */ |
| msleep(500); |
| |
| /* Initialize configaration */ |
| max17042_write_config_regs(chip); |
| |
| /* write cell characterization data */ |
| ret = max17042_init_model(chip); |
| if (ret) { |
| dev_err(&chip->client->dev, "%s init failed\n", |
| __func__); |
| return -EIO; |
| } |
| max17042_verify_model_lock(chip); |
| if (ret) { |
| dev_err(&chip->client->dev, "%s lock verify failed\n", |
| __func__); |
| return -EIO; |
| } |
| /* write custom parameters */ |
| max17042_write_custom_regs(chip); |
| |
| /* update capacity params */ |
| max17042_update_capacity_regs(chip); |
| |
| /* delay must be atleast 350mS to allow VFSOC |
| * to be calculated from the new configuration |
| */ |
| msleep(350); |
| |
| /* reset vfsoc0 reg */ |
| max17042_reset_vfsoc0_reg(chip); |
| |
| /* load new capacity params */ |
| max17042_load_new_capacity_params(chip); |
| |
| /* Init complete, Clear the POR bit */ |
| val = max17042_read_reg(chip->client, MAX17042_STATUS); |
| max17042_write_reg(chip->client, MAX17042_STATUS, |
| val & (~STATUS_POR_BIT)); |
| return 0; |
| } |
| |
| static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off) |
| { |
| u16 soc, soc_tr; |
| |
| /* program interrupt thesholds such that we should |
| * get interrupt for every 'off' perc change in the soc |
| */ |
| soc = max17042_read_reg(chip->client, MAX17042_RepSOC) >> 8; |
| soc_tr = (soc + off) << 8; |
| soc_tr |= (soc - off); |
| max17042_write_reg(chip->client, MAX17042_SALRT_Th, soc_tr); |
| } |
| |
| static irqreturn_t max17042_thread_handler(int id, void *dev) |
| { |
| struct max17042_chip *chip = dev; |
| u16 val; |
| |
| val = max17042_read_reg(chip->client, MAX17042_STATUS); |
| if ((val & STATUS_INTR_SOCMIN_BIT) || |
| (val & STATUS_INTR_SOCMAX_BIT)) { |
| dev_info(&chip->client->dev, "SOC threshold INTR\n"); |
| max17042_set_soc_threshold(chip, 1); |
| } |
| |
| power_supply_changed(&chip->battery); |
| return IRQ_HANDLED; |
| } |
| |
| static void max17042_init_worker(struct work_struct *work) |
| { |
| struct max17042_chip *chip = container_of(work, |
| struct max17042_chip, work); |
| int ret; |
| |
| /* Initialize registers according to values from the platform data */ |
| if (chip->pdata->enable_por_init && chip->pdata->config_data) { |
| ret = max17042_init_chip(chip); |
| if (ret) |
| return; |
| } |
| |
| chip->init_complete = 1; |
| } |
| |
| #ifdef CONFIG_OF |
| static struct max17042_platform_data * |
| max17042_get_pdata(struct device *dev) |
| { |
| struct device_node *np = dev->of_node; |
| u32 prop; |
| struct max17042_platform_data *pdata; |
| |
| if (!np) |
| return dev->platform_data; |
| |
| pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); |
| if (!pdata) |
| return NULL; |
| |
| /* |
| * Require current sense resistor value to be specified for |
| * current-sense functionality to be enabled at all. |
| */ |
| if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) { |
| pdata->r_sns = prop; |
| pdata->enable_current_sense = true; |
| } |
| |
| return pdata; |
| } |
| #else |
| static struct max17042_platform_data * |
| max17042_get_pdata(struct device *dev) |
| { |
| return dev->platform_data; |
| } |
| #endif |
| |
| static int __devinit max17042_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); |
| struct max17042_chip *chip; |
| int ret; |
| int reg; |
| |
| if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) |
| return -EIO; |
| |
| chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); |
| if (!chip) |
| return -ENOMEM; |
| |
| chip->client = client; |
| chip->pdata = max17042_get_pdata(&client->dev); |
| if (!chip->pdata) { |
| dev_err(&client->dev, "no platform data provided\n"); |
| return -EINVAL; |
| } |
| |
| i2c_set_clientdata(client, chip); |
| |
| chip->battery.name = "max17042_battery"; |
| chip->battery.type = POWER_SUPPLY_TYPE_BATTERY; |
| chip->battery.get_property = max17042_get_property; |
| chip->battery.properties = max17042_battery_props; |
| chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props); |
| |
| /* When current is not measured, |
| * CURRENT_NOW and CURRENT_AVG properties should be invisible. */ |
| if (!chip->pdata->enable_current_sense) |
| chip->battery.num_properties -= 2; |
| |
| if (chip->pdata->r_sns == 0) |
| chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR; |
| |
| if (chip->pdata->init_data) |
| max17042_set_reg(client, chip->pdata->init_data, |
| chip->pdata->num_init_data); |
| |
| if (!chip->pdata->enable_current_sense) { |
| max17042_write_reg(client, MAX17042_CGAIN, 0x0000); |
| max17042_write_reg(client, MAX17042_MiscCFG, 0x0003); |
| max17042_write_reg(client, MAX17042_LearnCFG, 0x0007); |
| } |
| |
| if (client->irq) { |
| ret = request_threaded_irq(client->irq, NULL, |
| max17042_thread_handler, |
| IRQF_TRIGGER_FALLING, |
| chip->battery.name, chip); |
| if (!ret) { |
| reg = max17042_read_reg(client, MAX17042_CONFIG); |
| reg |= CONFIG_ALRT_BIT_ENBL; |
| max17042_write_reg(client, MAX17042_CONFIG, reg); |
| max17042_set_soc_threshold(chip, 1); |
| } else |
| dev_err(&client->dev, "%s(): cannot get IRQ\n", |
| __func__); |
| } |
| |
| reg = max17042_read_reg(chip->client, MAX17042_STATUS); |
| |
| if (reg & STATUS_POR_BIT) { |
| INIT_WORK(&chip->work, max17042_init_worker); |
| schedule_work(&chip->work); |
| } else { |
| chip->init_complete = 1; |
| } |
| |
| ret = power_supply_register(&client->dev, &chip->battery); |
| if (ret) |
| dev_err(&client->dev, "failed: power supply register\n"); |
| return ret; |
| } |
| |
| static int __devexit max17042_remove(struct i2c_client *client) |
| { |
| struct max17042_chip *chip = i2c_get_clientdata(client); |
| |
| power_supply_unregister(&chip->battery); |
| return 0; |
| } |
| |
| #ifdef CONFIG_OF |
| static const struct of_device_id max17042_dt_match[] = { |
| { .compatible = "maxim,max17042" }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(of, max17042_dt_match); |
| #endif |
| |
| static const struct i2c_device_id max17042_id[] = { |
| { "max17042", 0 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, max17042_id); |
| |
| static struct i2c_driver max17042_i2c_driver = { |
| .driver = { |
| .name = "max17042", |
| .of_match_table = of_match_ptr(max17042_dt_match), |
| }, |
| .probe = max17042_probe, |
| .remove = __devexit_p(max17042_remove), |
| .id_table = max17042_id, |
| }; |
| module_i2c_driver(max17042_i2c_driver); |
| |
| MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); |
| MODULE_DESCRIPTION("MAX17042 Fuel Gauge"); |
| MODULE_LICENSE("GPL"); |