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583 lines
16 KiB
583 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Battery charger driver for Dialog Semiconductor DA9030 |
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* |
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* Copyright (C) 2008 Compulab, Ltd. |
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* Mike Rapoport <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/init.h> |
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#include <linux/types.h> |
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#include <linux/device.h> |
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#include <linux/workqueue.h> |
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#include <linux/module.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/mfd/da903x.h> |
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#include <linux/debugfs.h> |
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#include <linux/seq_file.h> |
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#include <linux/notifier.h> |
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#define DA9030_FAULT_LOG 0x0a |
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#define DA9030_FAULT_LOG_OVER_TEMP (1 << 7) |
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#define DA9030_FAULT_LOG_VBAT_OVER (1 << 4) |
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#define DA9030_CHARGE_CONTROL 0x28 |
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#define DA9030_CHRG_CHARGER_ENABLE (1 << 7) |
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#define DA9030_ADC_MAN_CONTROL 0x30 |
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#define DA9030_ADC_TBATREF_ENABLE (1 << 5) |
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#define DA9030_ADC_LDO_INT_ENABLE (1 << 4) |
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#define DA9030_ADC_AUTO_CONTROL 0x31 |
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#define DA9030_ADC_TBAT_ENABLE (1 << 5) |
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#define DA9030_ADC_VBAT_IN_TXON (1 << 4) |
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#define DA9030_ADC_VCH_ENABLE (1 << 3) |
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#define DA9030_ADC_ICH_ENABLE (1 << 2) |
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#define DA9030_ADC_VBAT_ENABLE (1 << 1) |
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#define DA9030_ADC_AUTO_SLEEP_ENABLE (1 << 0) |
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#define DA9030_VBATMON 0x32 |
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#define DA9030_VBATMONTXON 0x33 |
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#define DA9030_TBATHIGHP 0x34 |
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#define DA9030_TBATHIGHN 0x35 |
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#define DA9030_TBATLOW 0x36 |
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#define DA9030_VBAT_RES 0x41 |
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#define DA9030_VBATMIN_RES 0x42 |
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#define DA9030_VBATMINTXON_RES 0x43 |
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#define DA9030_ICHMAX_RES 0x44 |
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#define DA9030_ICHMIN_RES 0x45 |
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#define DA9030_ICHAVERAGE_RES 0x46 |
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#define DA9030_VCHMAX_RES 0x47 |
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#define DA9030_VCHMIN_RES 0x48 |
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#define DA9030_TBAT_RES 0x49 |
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struct da9030_adc_res { |
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uint8_t vbat_res; |
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uint8_t vbatmin_res; |
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uint8_t vbatmintxon; |
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uint8_t ichmax_res; |
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uint8_t ichmin_res; |
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uint8_t ichaverage_res; |
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uint8_t vchmax_res; |
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uint8_t vchmin_res; |
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uint8_t tbat_res; |
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uint8_t adc_in4_res; |
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uint8_t adc_in5_res; |
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}; |
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struct da9030_battery_thresholds { |
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int tbat_low; |
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int tbat_high; |
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int tbat_restart; |
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int vbat_low; |
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int vbat_crit; |
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int vbat_charge_start; |
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int vbat_charge_stop; |
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int vbat_charge_restart; |
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int vcharge_min; |
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int vcharge_max; |
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}; |
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struct da9030_charger { |
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struct power_supply *psy; |
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struct power_supply_desc psy_desc; |
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struct device *master; |
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struct da9030_adc_res adc; |
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struct delayed_work work; |
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unsigned int interval; |
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struct power_supply_info *battery_info; |
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struct da9030_battery_thresholds thresholds; |
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unsigned int charge_milliamp; |
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unsigned int charge_millivolt; |
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|
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/* charger status */ |
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bool chdet; |
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uint8_t fault; |
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int mA; |
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int mV; |
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bool is_on; |
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struct notifier_block nb; |
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/* platform callbacks for battery low and critical events */ |
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void (*battery_low)(void); |
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void (*battery_critical)(void); |
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struct dentry *debug_file; |
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}; |
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static inline int da9030_reg_to_mV(int reg) |
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{ |
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return ((reg * 2650) >> 8) + 2650; |
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} |
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static inline int da9030_millivolt_to_reg(int mV) |
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{ |
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return ((mV - 2650) << 8) / 2650; |
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} |
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static inline int da9030_reg_to_mA(int reg) |
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{ |
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return ((reg * 24000) >> 8) / 15; |
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} |
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#ifdef CONFIG_DEBUG_FS |
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static int bat_debug_show(struct seq_file *s, void *data) |
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{ |
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struct da9030_charger *charger = s->private; |
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seq_printf(s, "charger is %s\n", charger->is_on ? "on" : "off"); |
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if (charger->chdet) { |
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seq_printf(s, "iset = %dmA, vset = %dmV\n", |
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charger->mA, charger->mV); |
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} |
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seq_printf(s, "vbat_res = %d (%dmV)\n", |
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charger->adc.vbat_res, |
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da9030_reg_to_mV(charger->adc.vbat_res)); |
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seq_printf(s, "vbatmin_res = %d (%dmV)\n", |
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charger->adc.vbatmin_res, |
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da9030_reg_to_mV(charger->adc.vbatmin_res)); |
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seq_printf(s, "vbatmintxon = %d (%dmV)\n", |
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charger->adc.vbatmintxon, |
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da9030_reg_to_mV(charger->adc.vbatmintxon)); |
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seq_printf(s, "ichmax_res = %d (%dmA)\n", |
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charger->adc.ichmax_res, |
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da9030_reg_to_mV(charger->adc.ichmax_res)); |
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seq_printf(s, "ichmin_res = %d (%dmA)\n", |
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charger->adc.ichmin_res, |
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da9030_reg_to_mA(charger->adc.ichmin_res)); |
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seq_printf(s, "ichaverage_res = %d (%dmA)\n", |
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charger->adc.ichaverage_res, |
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da9030_reg_to_mA(charger->adc.ichaverage_res)); |
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seq_printf(s, "vchmax_res = %d (%dmV)\n", |
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charger->adc.vchmax_res, |
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da9030_reg_to_mA(charger->adc.vchmax_res)); |
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seq_printf(s, "vchmin_res = %d (%dmV)\n", |
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charger->adc.vchmin_res, |
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da9030_reg_to_mV(charger->adc.vchmin_res)); |
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return 0; |
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} |
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DEFINE_SHOW_ATTRIBUTE(bat_debug); |
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static struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger) |
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{ |
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charger->debug_file = debugfs_create_file("charger", 0666, NULL, |
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charger, &bat_debug_fops); |
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return charger->debug_file; |
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} |
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static void da9030_bat_remove_debugfs(struct da9030_charger *charger) |
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{ |
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debugfs_remove(charger->debug_file); |
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} |
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#else |
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static inline struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger) |
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{ |
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return NULL; |
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} |
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static inline void da9030_bat_remove_debugfs(struct da9030_charger *charger) |
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{ |
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} |
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#endif |
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static inline void da9030_read_adc(struct da9030_charger *charger, |
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struct da9030_adc_res *adc) |
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{ |
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da903x_reads(charger->master, DA9030_VBAT_RES, |
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sizeof(*adc), (uint8_t *)adc); |
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} |
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static void da9030_charger_update_state(struct da9030_charger *charger) |
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{ |
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uint8_t val; |
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da903x_read(charger->master, DA9030_CHARGE_CONTROL, &val); |
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charger->is_on = (val & DA9030_CHRG_CHARGER_ENABLE) ? 1 : 0; |
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charger->mA = ((val >> 3) & 0xf) * 100; |
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charger->mV = (val & 0x7) * 50 + 4000; |
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da9030_read_adc(charger, &charger->adc); |
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da903x_read(charger->master, DA9030_FAULT_LOG, &charger->fault); |
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charger->chdet = da903x_query_status(charger->master, |
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DA9030_STATUS_CHDET); |
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} |
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static void da9030_set_charge(struct da9030_charger *charger, int on) |
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{ |
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uint8_t val; |
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if (on) { |
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val = DA9030_CHRG_CHARGER_ENABLE; |
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val |= (charger->charge_milliamp / 100) << 3; |
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val |= (charger->charge_millivolt - 4000) / 50; |
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charger->is_on = 1; |
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} else { |
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val = 0; |
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charger->is_on = 0; |
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} |
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da903x_write(charger->master, DA9030_CHARGE_CONTROL, val); |
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power_supply_changed(charger->psy); |
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} |
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static void da9030_charger_check_state(struct da9030_charger *charger) |
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{ |
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da9030_charger_update_state(charger); |
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/* we wake or boot with external power on */ |
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if (!charger->is_on) { |
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if ((charger->chdet) && |
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(charger->adc.vbat_res < |
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charger->thresholds.vbat_charge_start)) { |
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da9030_set_charge(charger, 1); |
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} |
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} else { |
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/* Charger has been pulled out */ |
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if (!charger->chdet) { |
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da9030_set_charge(charger, 0); |
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return; |
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} |
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if (charger->adc.vbat_res >= |
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charger->thresholds.vbat_charge_stop) { |
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da9030_set_charge(charger, 0); |
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da903x_write(charger->master, DA9030_VBATMON, |
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charger->thresholds.vbat_charge_restart); |
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} else if (charger->adc.vbat_res > |
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charger->thresholds.vbat_low) { |
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/* we are charging and passed LOW_THRESH, |
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so upate DA9030 VBAT threshold |
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*/ |
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da903x_write(charger->master, DA9030_VBATMON, |
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charger->thresholds.vbat_low); |
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} |
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if (charger->adc.vchmax_res > charger->thresholds.vcharge_max || |
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charger->adc.vchmin_res < charger->thresholds.vcharge_min || |
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/* Tempreture readings are negative */ |
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charger->adc.tbat_res < charger->thresholds.tbat_high || |
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charger->adc.tbat_res > charger->thresholds.tbat_low) { |
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/* disable charger */ |
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da9030_set_charge(charger, 0); |
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} |
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} |
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} |
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static void da9030_charging_monitor(struct work_struct *work) |
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{ |
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struct da9030_charger *charger; |
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charger = container_of(work, struct da9030_charger, work.work); |
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da9030_charger_check_state(charger); |
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/* reschedule for the next time */ |
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schedule_delayed_work(&charger->work, charger->interval); |
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} |
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static enum power_supply_property da9030_battery_props[] = { |
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POWER_SUPPLY_PROP_MODEL_NAME, |
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POWER_SUPPLY_PROP_STATUS, |
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POWER_SUPPLY_PROP_HEALTH, |
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POWER_SUPPLY_PROP_TECHNOLOGY, |
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POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, |
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POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, |
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POWER_SUPPLY_PROP_VOLTAGE_NOW, |
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POWER_SUPPLY_PROP_CURRENT_AVG, |
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}; |
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static void da9030_battery_check_status(struct da9030_charger *charger, |
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union power_supply_propval *val) |
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{ |
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if (charger->chdet) { |
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if (charger->is_on) |
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val->intval = POWER_SUPPLY_STATUS_CHARGING; |
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else |
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; |
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} else { |
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val->intval = POWER_SUPPLY_STATUS_DISCHARGING; |
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} |
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} |
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static void da9030_battery_check_health(struct da9030_charger *charger, |
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union power_supply_propval *val) |
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{ |
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if (charger->fault & DA9030_FAULT_LOG_OVER_TEMP) |
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val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; |
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else if (charger->fault & DA9030_FAULT_LOG_VBAT_OVER) |
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val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; |
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else |
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val->intval = POWER_SUPPLY_HEALTH_GOOD; |
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} |
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static int da9030_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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struct da9030_charger *charger = power_supply_get_drvdata(psy); |
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switch (psp) { |
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case POWER_SUPPLY_PROP_STATUS: |
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da9030_battery_check_status(charger, val); |
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break; |
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case POWER_SUPPLY_PROP_HEALTH: |
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da9030_battery_check_health(charger, val); |
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break; |
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case POWER_SUPPLY_PROP_TECHNOLOGY: |
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val->intval = charger->battery_info->technology; |
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break; |
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case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: |
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val->intval = charger->battery_info->voltage_max_design; |
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break; |
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case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: |
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val->intval = charger->battery_info->voltage_min_design; |
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break; |
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case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
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val->intval = da9030_reg_to_mV(charger->adc.vbat_res) * 1000; |
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break; |
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case POWER_SUPPLY_PROP_CURRENT_AVG: |
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val->intval = |
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da9030_reg_to_mA(charger->adc.ichaverage_res) * 1000; |
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break; |
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case POWER_SUPPLY_PROP_MODEL_NAME: |
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val->strval = charger->battery_info->name; |
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break; |
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default: |
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break; |
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} |
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return 0; |
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} |
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static void da9030_battery_vbat_event(struct da9030_charger *charger) |
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{ |
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da9030_read_adc(charger, &charger->adc); |
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if (charger->is_on) |
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return; |
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if (charger->adc.vbat_res < charger->thresholds.vbat_low) { |
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/* set VBAT threshold for critical */ |
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da903x_write(charger->master, DA9030_VBATMON, |
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charger->thresholds.vbat_crit); |
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if (charger->battery_low) |
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charger->battery_low(); |
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} else if (charger->adc.vbat_res < |
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charger->thresholds.vbat_crit) { |
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/* notify the system of battery critical */ |
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if (charger->battery_critical) |
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charger->battery_critical(); |
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} |
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} |
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static int da9030_battery_event(struct notifier_block *nb, unsigned long event, |
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void *data) |
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{ |
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struct da9030_charger *charger = |
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container_of(nb, struct da9030_charger, nb); |
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switch (event) { |
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case DA9030_EVENT_CHDET: |
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cancel_delayed_work_sync(&charger->work); |
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schedule_work(&charger->work.work); |
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break; |
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case DA9030_EVENT_VBATMON: |
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da9030_battery_vbat_event(charger); |
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break; |
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case DA9030_EVENT_CHIOVER: |
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case DA9030_EVENT_TBAT: |
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da9030_set_charge(charger, 0); |
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break; |
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} |
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return 0; |
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} |
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static void da9030_battery_convert_thresholds(struct da9030_charger *charger, |
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struct da9030_battery_info *pdata) |
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{ |
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charger->thresholds.tbat_low = pdata->tbat_low; |
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charger->thresholds.tbat_high = pdata->tbat_high; |
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charger->thresholds.tbat_restart = pdata->tbat_restart; |
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charger->thresholds.vbat_low = |
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da9030_millivolt_to_reg(pdata->vbat_low); |
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charger->thresholds.vbat_crit = |
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da9030_millivolt_to_reg(pdata->vbat_crit); |
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charger->thresholds.vbat_charge_start = |
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da9030_millivolt_to_reg(pdata->vbat_charge_start); |
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charger->thresholds.vbat_charge_stop = |
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da9030_millivolt_to_reg(pdata->vbat_charge_stop); |
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charger->thresholds.vbat_charge_restart = |
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da9030_millivolt_to_reg(pdata->vbat_charge_restart); |
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charger->thresholds.vcharge_min = |
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da9030_millivolt_to_reg(pdata->vcharge_min); |
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charger->thresholds.vcharge_max = |
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da9030_millivolt_to_reg(pdata->vcharge_max); |
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} |
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static void da9030_battery_setup_psy(struct da9030_charger *charger) |
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{ |
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struct power_supply_desc *psy_desc = &charger->psy_desc; |
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struct power_supply_info *info = charger->battery_info; |
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|
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psy_desc->name = info->name; |
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psy_desc->use_for_apm = info->use_for_apm; |
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psy_desc->type = POWER_SUPPLY_TYPE_BATTERY; |
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psy_desc->get_property = da9030_battery_get_property; |
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|
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psy_desc->properties = da9030_battery_props; |
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psy_desc->num_properties = ARRAY_SIZE(da9030_battery_props); |
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}; |
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static int da9030_battery_charger_init(struct da9030_charger *charger) |
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{ |
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char v[5]; |
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int ret; |
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|
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v[0] = v[1] = charger->thresholds.vbat_low; |
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v[2] = charger->thresholds.tbat_high; |
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v[3] = charger->thresholds.tbat_restart; |
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v[4] = charger->thresholds.tbat_low; |
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|
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ret = da903x_writes(charger->master, DA9030_VBATMON, 5, v); |
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if (ret) |
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return ret; |
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|
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/* |
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* Enable reference voltage supply for ADC from the LDO_INTERNAL |
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* regulator. Must be set before ADC measurements can be made. |
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*/ |
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ret = da903x_write(charger->master, DA9030_ADC_MAN_CONTROL, |
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DA9030_ADC_LDO_INT_ENABLE | |
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DA9030_ADC_TBATREF_ENABLE); |
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if (ret) |
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return ret; |
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|
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/* enable auto ADC measuremnts */ |
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return da903x_write(charger->master, DA9030_ADC_AUTO_CONTROL, |
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DA9030_ADC_TBAT_ENABLE | DA9030_ADC_VBAT_IN_TXON | |
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DA9030_ADC_VCH_ENABLE | DA9030_ADC_ICH_ENABLE | |
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DA9030_ADC_VBAT_ENABLE | |
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DA9030_ADC_AUTO_SLEEP_ENABLE); |
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} |
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|
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static int da9030_battery_probe(struct platform_device *pdev) |
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{ |
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struct da9030_charger *charger; |
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struct power_supply_config psy_cfg = {}; |
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struct da9030_battery_info *pdata = pdev->dev.platform_data; |
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int ret; |
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|
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if (pdata == NULL) |
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return -EINVAL; |
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|
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if (pdata->charge_milliamp >= 1500 || |
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pdata->charge_millivolt < 4000 || |
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pdata->charge_millivolt > 4350) |
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return -EINVAL; |
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|
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charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL); |
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if (charger == NULL) |
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return -ENOMEM; |
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|
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charger->master = pdev->dev.parent; |
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|
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/* 10 seconds between monitor runs unless platform defines other |
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interval */ |
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charger->interval = msecs_to_jiffies( |
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(pdata->batmon_interval ? : 10) * 1000); |
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|
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charger->charge_milliamp = pdata->charge_milliamp; |
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charger->charge_millivolt = pdata->charge_millivolt; |
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charger->battery_info = pdata->battery_info; |
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charger->battery_low = pdata->battery_low; |
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charger->battery_critical = pdata->battery_critical; |
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|
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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); |
|
psy_cfg.drv_data = charger; |
|
charger->psy = power_supply_register(&pdev->dev, &charger->psy_desc, |
|
&psy_cfg); |
|
if (IS_ERR(charger->psy)) { |
|
ret = PTR_ERR(charger->psy); |
|
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");
|
|
|