596 lines
16 KiB
C
596 lines
16 KiB
C
/*
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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 <mike@compulab.co.il>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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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#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 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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/* 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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static int debug_open(struct inode *inode, struct file *file)
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{
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return single_open(file, bat_debug_show, inode->i_private);
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}
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static const struct file_operations bat_debug_fops = {
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.open = debug_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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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, 0, charger,
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&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;
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charger = container_of(psy, struct da9030_charger, 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 *psy = &charger->psy;
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struct power_supply_info *info = charger->battery_info;
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psy->name = info->name;
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psy->use_for_apm = info->use_for_apm;
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psy->type = POWER_SUPPLY_TYPE_BATTERY;
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psy->get_property = da9030_battery_get_property;
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psy->properties = da9030_battery_props;
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psy->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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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;
|
|
|
|
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 = kzalloc(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);
|
|
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:
|
|
kfree(charger);
|
|
|
|
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);
|
|
|
|
kfree(charger);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver da903x_battery_driver = {
|
|
.driver = {
|
|
.name = "da903x-battery",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.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");
|