| /* |
| * Battery charger driver for Dialog Semiconductor DA9030 |
| * |
| * Copyright (C) 2008 Compulab, Ltd. |
| * Mike Rapoport <mike@compulab.co.il> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/init.h> |
| #include <linux/types.h> |
| #include <linux/device.h> |
| #include <linux/workqueue.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/power_supply.h> |
| #include <linux/mfd/da903x.h> |
| |
| #include <linux/debugfs.h> |
| #include <linux/seq_file.h> |
| #include <linux/notifier.h> |
| |
| #define DA9030_FAULT_LOG 0x0a |
| #define DA9030_FAULT_LOG_OVER_TEMP (1 << 7) |
| #define DA9030_FAULT_LOG_VBAT_OVER (1 << 4) |
| |
| #define DA9030_CHARGE_CONTROL 0x28 |
| #define DA9030_CHRG_CHARGER_ENABLE (1 << 7) |
| |
| #define DA9030_ADC_MAN_CONTROL 0x30 |
| #define DA9030_ADC_TBATREF_ENABLE (1 << 5) |
| #define DA9030_ADC_LDO_INT_ENABLE (1 << 4) |
| |
| #define DA9030_ADC_AUTO_CONTROL 0x31 |
| #define DA9030_ADC_TBAT_ENABLE (1 << 5) |
| #define DA9030_ADC_VBAT_IN_TXON (1 << 4) |
| #define DA9030_ADC_VCH_ENABLE (1 << 3) |
| #define DA9030_ADC_ICH_ENABLE (1 << 2) |
| #define DA9030_ADC_VBAT_ENABLE (1 << 1) |
| #define DA9030_ADC_AUTO_SLEEP_ENABLE (1 << 0) |
| |
| #define DA9030_VBATMON 0x32 |
| #define DA9030_VBATMONTXON 0x33 |
| #define DA9030_TBATHIGHP 0x34 |
| #define DA9030_TBATHIGHN 0x35 |
| #define DA9030_TBATLOW 0x36 |
| |
| #define DA9030_VBAT_RES 0x41 |
| #define DA9030_VBATMIN_RES 0x42 |
| #define DA9030_VBATMINTXON_RES 0x43 |
| #define DA9030_ICHMAX_RES 0x44 |
| #define DA9030_ICHMIN_RES 0x45 |
| #define DA9030_ICHAVERAGE_RES 0x46 |
| #define DA9030_VCHMAX_RES 0x47 |
| #define DA9030_VCHMIN_RES 0x48 |
| #define DA9030_TBAT_RES 0x49 |
| |
| struct da9030_adc_res { |
| uint8_t vbat_res; |
| uint8_t vbatmin_res; |
| uint8_t vbatmintxon; |
| uint8_t ichmax_res; |
| uint8_t ichmin_res; |
| uint8_t ichaverage_res; |
| uint8_t vchmax_res; |
| uint8_t vchmin_res; |
| uint8_t tbat_res; |
| uint8_t adc_in4_res; |
| uint8_t adc_in5_res; |
| }; |
| |
| struct da9030_battery_thresholds { |
| int tbat_low; |
| int tbat_high; |
| int tbat_restart; |
| |
| int vbat_low; |
| int vbat_crit; |
| int vbat_charge_start; |
| int vbat_charge_stop; |
| int vbat_charge_restart; |
| |
| int vcharge_min; |
| int vcharge_max; |
| }; |
| |
| struct da9030_charger { |
| struct power_supply psy; |
| |
| struct device *master; |
| |
| struct da9030_adc_res adc; |
| struct delayed_work work; |
| unsigned int interval; |
| |
| struct power_supply_info *battery_info; |
| |
| struct da9030_battery_thresholds thresholds; |
| |
| unsigned int charge_milliamp; |
| unsigned int charge_millivolt; |
| |
| /* charger status */ |
| bool chdet; |
| uint8_t fault; |
| int mA; |
| int mV; |
| bool is_on; |
| |
| struct notifier_block nb; |
| |
| /* platform callbacks for battery low and critical events */ |
| void (*battery_low)(void); |
| void (*battery_critical)(void); |
| |
| struct dentry *debug_file; |
| }; |
| |
| static inline int da9030_reg_to_mV(int reg) |
| { |
| return ((reg * 2650) >> 8) + 2650; |
| } |
| |
| static inline int da9030_millivolt_to_reg(int mV) |
| { |
| return ((mV - 2650) << 8) / 2650; |
| } |
| |
| static inline int da9030_reg_to_mA(int reg) |
| { |
| return ((reg * 24000) >> 8) / 15; |
| } |
| |
| #ifdef CONFIG_DEBUG_FS |
| static int bat_debug_show(struct seq_file *s, void *data) |
| { |
| struct da9030_charger *charger = s->private; |
| |
| seq_printf(s, "charger is %s\n", charger->is_on ? "on" : "off"); |
| if (charger->chdet) { |
| seq_printf(s, "iset = %dmA, vset = %dmV\n", |
| charger->mA, charger->mV); |
| } |
| |
| seq_printf(s, "vbat_res = %d (%dmV)\n", |
| charger->adc.vbat_res, |
| da9030_reg_to_mV(charger->adc.vbat_res)); |
| seq_printf(s, "vbatmin_res = %d (%dmV)\n", |
| charger->adc.vbatmin_res, |
| da9030_reg_to_mV(charger->adc.vbatmin_res)); |
| seq_printf(s, "vbatmintxon = %d (%dmV)\n", |
| charger->adc.vbatmintxon, |
| da9030_reg_to_mV(charger->adc.vbatmintxon)); |
| seq_printf(s, "ichmax_res = %d (%dmA)\n", |
| charger->adc.ichmax_res, |
| da9030_reg_to_mV(charger->adc.ichmax_res)); |
| seq_printf(s, "ichmin_res = %d (%dmA)\n", |
| charger->adc.ichmin_res, |
| da9030_reg_to_mA(charger->adc.ichmin_res)); |
| seq_printf(s, "ichaverage_res = %d (%dmA)\n", |
| charger->adc.ichaverage_res, |
| da9030_reg_to_mA(charger->adc.ichaverage_res)); |
| seq_printf(s, "vchmax_res = %d (%dmV)\n", |
| charger->adc.vchmax_res, |
| da9030_reg_to_mA(charger->adc.vchmax_res)); |
| seq_printf(s, "vchmin_res = %d (%dmV)\n", |
| charger->adc.vchmin_res, |
| da9030_reg_to_mV(charger->adc.vchmin_res)); |
| |
| return 0; |
| } |
| |
| static int debug_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, bat_debug_show, inode->i_private); |
| } |
| |
| static const struct file_operations bat_debug_fops = { |
| .open = debug_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger) |
| { |
| charger->debug_file = debugfs_create_file("charger", 0666, NULL, |
| charger, &bat_debug_fops); |
| return charger->debug_file; |
| } |
| |
| static void da9030_bat_remove_debugfs(struct da9030_charger *charger) |
| { |
| debugfs_remove(charger->debug_file); |
| } |
| #else |
| static inline struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger) |
| { |
| return NULL; |
| } |
| static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger) |
| { |
| } |
| #endif |
| |
| static inline void da9030_read_adc(struct da9030_charger *charger, |
| struct da9030_adc_res *adc) |
| { |
| da903x_reads(charger->master, DA9030_VBAT_RES, |
| sizeof(*adc), (uint8_t *)adc); |
| } |
| |
| static void da9030_charger_update_state(struct da9030_charger *charger) |
| { |
| uint8_t val; |
| |
| da903x_read(charger->master, DA9030_CHARGE_CONTROL, &val); |
| charger->is_on = (val & DA9030_CHRG_CHARGER_ENABLE) ? 1 : 0; |
| charger->mA = ((val >> 3) & 0xf) * 100; |
| charger->mV = (val & 0x7) * 50 + 4000; |
| |
| da9030_read_adc(charger, &charger->adc); |
| da903x_read(charger->master, DA9030_FAULT_LOG, &charger->fault); |
| charger->chdet = da903x_query_status(charger->master, |
| DA9030_STATUS_CHDET); |
| } |
| |
| static void da9030_set_charge(struct da9030_charger *charger, int on) |
| { |
| uint8_t val; |
| |
| if (on) { |
| val = DA9030_CHRG_CHARGER_ENABLE; |
| val |= (charger->charge_milliamp / 100) << 3; |
| val |= (charger->charge_millivolt - 4000) / 50; |
| charger->is_on = 1; |
| } else { |
| val = 0; |
| charger->is_on = 0; |
| } |
| |
| da903x_write(charger->master, DA9030_CHARGE_CONTROL, val); |
| |
| power_supply_changed(&charger->psy); |
| } |
| |
| static void da9030_charger_check_state(struct da9030_charger *charger) |
| { |
| da9030_charger_update_state(charger); |
| |
| /* we wake or boot with external power on */ |
| if (!charger->is_on) { |
| if ((charger->chdet) && |
| (charger->adc.vbat_res < |
| charger->thresholds.vbat_charge_start)) { |
| da9030_set_charge(charger, 1); |
| } |
| } else { |
| /* Charger has been pulled out */ |
| if (!charger->chdet) { |
| da9030_set_charge(charger, 0); |
| return; |
| } |
| |
| if (charger->adc.vbat_res >= |
| charger->thresholds.vbat_charge_stop) { |
| da9030_set_charge(charger, 0); |
| da903x_write(charger->master, DA9030_VBATMON, |
| charger->thresholds.vbat_charge_restart); |
| } else if (charger->adc.vbat_res > |
| charger->thresholds.vbat_low) { |
| /* we are charging and passed LOW_THRESH, |
| so upate DA9030 VBAT threshold |
| */ |
| da903x_write(charger->master, DA9030_VBATMON, |
| charger->thresholds.vbat_low); |
| } |
| if (charger->adc.vchmax_res > charger->thresholds.vcharge_max || |
| charger->adc.vchmin_res < charger->thresholds.vcharge_min || |
| /* Tempreture readings are negative */ |
| charger->adc.tbat_res < charger->thresholds.tbat_high || |
| charger->adc.tbat_res > charger->thresholds.tbat_low) { |
| /* disable charger */ |
| da9030_set_charge(charger, 0); |
| } |
| } |
| } |
| |
| static void da9030_charging_monitor(struct work_struct *work) |
| { |
| struct da9030_charger *charger; |
| |
| charger = container_of(work, struct da9030_charger, work.work); |
| |
| da9030_charger_check_state(charger); |
| |
| /* reschedule for the next time */ |
| schedule_delayed_work(&charger->work, charger->interval); |
| } |
| |
| static enum power_supply_property da9030_battery_props[] = { |
| POWER_SUPPLY_PROP_MODEL_NAME, |
| POWER_SUPPLY_PROP_STATUS, |
| POWER_SUPPLY_PROP_HEALTH, |
| POWER_SUPPLY_PROP_TECHNOLOGY, |
| POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, |
| POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, |
| POWER_SUPPLY_PROP_VOLTAGE_NOW, |
| POWER_SUPPLY_PROP_CURRENT_AVG, |
| }; |
| |
| static void da9030_battery_check_status(struct da9030_charger *charger, |
| union power_supply_propval *val) |
| { |
| if (charger->chdet) { |
| if (charger->is_on) |
| val->intval = POWER_SUPPLY_STATUS_CHARGING; |
| else |
| val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; |
| } else { |
| val->intval = POWER_SUPPLY_STATUS_DISCHARGING; |
| } |
| } |
| |
| static void da9030_battery_check_health(struct da9030_charger *charger, |
| union power_supply_propval *val) |
| { |
| if (charger->fault & DA9030_FAULT_LOG_OVER_TEMP) |
| val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; |
| else if (charger->fault & DA9030_FAULT_LOG_VBAT_OVER) |
| val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; |
| else |
| val->intval = POWER_SUPPLY_HEALTH_GOOD; |
| } |
| |
| static int da9030_battery_get_property(struct power_supply *psy, |
| enum power_supply_property psp, |
| union power_supply_propval *val) |
| { |
| struct da9030_charger *charger; |
| charger = container_of(psy, struct da9030_charger, psy); |
| |
| switch (psp) { |
| case POWER_SUPPLY_PROP_STATUS: |
| da9030_battery_check_status(charger, val); |
| break; |
| case POWER_SUPPLY_PROP_HEALTH: |
| da9030_battery_check_health(charger, val); |
| break; |
| case POWER_SUPPLY_PROP_TECHNOLOGY: |
| val->intval = charger->battery_info->technology; |
| break; |
| case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: |
| val->intval = charger->battery_info->voltage_max_design; |
| break; |
| case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: |
| val->intval = charger->battery_info->voltage_min_design; |
| break; |
| case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
| val->intval = da9030_reg_to_mV(charger->adc.vbat_res) * 1000; |
| break; |
| case POWER_SUPPLY_PROP_CURRENT_AVG: |
| val->intval = |
| da9030_reg_to_mA(charger->adc.ichaverage_res) * 1000; |
| break; |
| case POWER_SUPPLY_PROP_MODEL_NAME: |
| val->strval = charger->battery_info->name; |
| break; |
| default: |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static void da9030_battery_vbat_event(struct da9030_charger *charger) |
| { |
| da9030_read_adc(charger, &charger->adc); |
| |
| if (charger->is_on) |
| return; |
| |
| if (charger->adc.vbat_res < charger->thresholds.vbat_low) { |
| /* set VBAT threshold for critical */ |
| da903x_write(charger->master, DA9030_VBATMON, |
| charger->thresholds.vbat_crit); |
| if (charger->battery_low) |
| charger->battery_low(); |
| } else if (charger->adc.vbat_res < |
| charger->thresholds.vbat_crit) { |
| /* notify the system of battery critical */ |
| if (charger->battery_critical) |
| charger->battery_critical(); |
| } |
| } |
| |
| static int da9030_battery_event(struct notifier_block *nb, unsigned long event, |
| void *data) |
| { |
| struct da9030_charger *charger = |
| container_of(nb, struct da9030_charger, nb); |
| |
| switch (event) { |
| case DA9030_EVENT_CHDET: |
| cancel_delayed_work_sync(&charger->work); |
| schedule_work(&charger->work.work); |
| break; |
| case DA9030_EVENT_VBATMON: |
| da9030_battery_vbat_event(charger); |
| break; |
| case DA9030_EVENT_CHIOVER: |
| case DA9030_EVENT_TBAT: |
| da9030_set_charge(charger, 0); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static void da9030_battery_convert_thresholds(struct da9030_charger *charger, |
| struct da9030_battery_info *pdata) |
| { |
| charger->thresholds.tbat_low = pdata->tbat_low; |
| charger->thresholds.tbat_high = pdata->tbat_high; |
| charger->thresholds.tbat_restart = pdata->tbat_restart; |
| |
| charger->thresholds.vbat_low = |
| da9030_millivolt_to_reg(pdata->vbat_low); |
| charger->thresholds.vbat_crit = |
| da9030_millivolt_to_reg(pdata->vbat_crit); |
| charger->thresholds.vbat_charge_start = |
| da9030_millivolt_to_reg(pdata->vbat_charge_start); |
| charger->thresholds.vbat_charge_stop = |
| da9030_millivolt_to_reg(pdata->vbat_charge_stop); |
| charger->thresholds.vbat_charge_restart = |
| da9030_millivolt_to_reg(pdata->vbat_charge_restart); |
| |
| charger->thresholds.vcharge_min = |
| da9030_millivolt_to_reg(pdata->vcharge_min); |
| charger->thresholds.vcharge_max = |
| da9030_millivolt_to_reg(pdata->vcharge_max); |
| } |
| |
| static void da9030_battery_setup_psy(struct da9030_charger *charger) |
| { |
| struct power_supply *psy = &charger->psy; |
| struct power_supply_info *info = charger->battery_info; |
| |
| psy->name = info->name; |
| psy->use_for_apm = info->use_for_apm; |
| psy->type = POWER_SUPPLY_TYPE_BATTERY; |
| psy->get_property = da9030_battery_get_property; |
| |
| psy->properties = da9030_battery_props; |
| psy->num_properties = ARRAY_SIZE(da9030_battery_props); |
| }; |
| |
| static int da9030_battery_charger_init(struct da9030_charger *charger) |
| { |
| char v[5]; |
| int ret; |
| |
| v[0] = v[1] = charger->thresholds.vbat_low; |
| v[2] = charger->thresholds.tbat_high; |
| v[3] = charger->thresholds.tbat_restart; |
| v[4] = charger->thresholds.tbat_low; |
| |
| ret = da903x_writes(charger->master, DA9030_VBATMON, 5, v); |
| if (ret) |
| return ret; |
| |
| /* |
| * Enable reference voltage supply for ADC from the LDO_INTERNAL |
| * regulator. Must be set before ADC measurements can be made. |
| */ |
| ret = da903x_write(charger->master, DA9030_ADC_MAN_CONTROL, |
| DA9030_ADC_LDO_INT_ENABLE | |
| DA9030_ADC_TBATREF_ENABLE); |
| if (ret) |
| return ret; |
| |
| /* enable auto ADC measuremnts */ |
| return da903x_write(charger->master, DA9030_ADC_AUTO_CONTROL, |
| DA9030_ADC_TBAT_ENABLE | DA9030_ADC_VBAT_IN_TXON | |
| DA9030_ADC_VCH_ENABLE | DA9030_ADC_ICH_ENABLE | |
| DA9030_ADC_VBAT_ENABLE | |
| DA9030_ADC_AUTO_SLEEP_ENABLE); |
| } |
| |
| static int da9030_battery_probe(struct platform_device *pdev) |
| { |
| struct da9030_charger *charger; |
| struct da9030_battery_info *pdata = pdev->dev.platform_data; |
| int ret; |
| |
| if (pdata == NULL) |
| return -EINVAL; |
| |
| if (pdata->charge_milliamp >= 1500 || |
| pdata->charge_millivolt < 4000 || |
| pdata->charge_millivolt > 4350) |
| return -EINVAL; |
| |
| charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL); |
| if (charger == NULL) |
| return -ENOMEM; |
| |
| charger->master = pdev->dev.parent; |
| |
| /* 10 seconds between monitor runs unless platform defines other |
| interval */ |
| charger->interval = msecs_to_jiffies( |
| (pdata->batmon_interval ? : 10) * 1000); |
| |
| charger->charge_milliamp = pdata->charge_milliamp; |
| charger->charge_millivolt = pdata->charge_millivolt; |
| charger->battery_info = pdata->battery_info; |
| charger->battery_low = pdata->battery_low; |
| charger->battery_critical = pdata->battery_critical; |
| |
| da9030_battery_convert_thresholds(charger, pdata); |
| |
| ret = da9030_battery_charger_init(charger); |
| if (ret) |
| goto err_charger_init; |
| |
| INIT_DELAYED_WORK(&charger->work, da9030_charging_monitor); |
| schedule_delayed_work(&charger->work, charger->interval); |
| |
| charger->nb.notifier_call = da9030_battery_event; |
| ret = da903x_register_notifier(charger->master, &charger->nb, |
| DA9030_EVENT_CHDET | |
| DA9030_EVENT_VBATMON | |
| DA9030_EVENT_CHIOVER | |
| DA9030_EVENT_TBAT); |
| if (ret) |
| goto err_notifier; |
| |
| da9030_battery_setup_psy(charger); |
| ret = power_supply_register(&pdev->dev, &charger->psy, NULL); |
| if (ret) |
| goto err_ps_register; |
| |
| charger->debug_file = da9030_bat_create_debugfs(charger); |
| platform_set_drvdata(pdev, charger); |
| return 0; |
| |
| err_ps_register: |
| da903x_unregister_notifier(charger->master, &charger->nb, |
| DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON | |
| DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT); |
| err_notifier: |
| cancel_delayed_work(&charger->work); |
| |
| err_charger_init: |
| return ret; |
| } |
| |
| static int da9030_battery_remove(struct platform_device *dev) |
| { |
| struct da9030_charger *charger = platform_get_drvdata(dev); |
| |
| da9030_bat_remove_debugfs(charger); |
| |
| da903x_unregister_notifier(charger->master, &charger->nb, |
| DA9030_EVENT_CHDET | DA9030_EVENT_VBATMON | |
| DA9030_EVENT_CHIOVER | DA9030_EVENT_TBAT); |
| cancel_delayed_work_sync(&charger->work); |
| da9030_set_charge(charger, 0); |
| power_supply_unregister(&charger->psy); |
| |
| return 0; |
| } |
| |
| static struct platform_driver da903x_battery_driver = { |
| .driver = { |
| .name = "da903x-battery", |
| }, |
| .probe = da9030_battery_probe, |
| .remove = da9030_battery_remove, |
| }; |
| |
| module_platform_driver(da903x_battery_driver); |
| |
| MODULE_DESCRIPTION("DA9030 battery charger driver"); |
| MODULE_AUTHOR("Mike Rapoport, CompuLab"); |
| MODULE_LICENSE("GPL"); |