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/*
* 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
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