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Message-ID: <20081222102255.GB2633@sortiz.org>
Date: Mon, 22 Dec 2008 11:22:56 +0100
From: Samuel Ortiz <sameo@...nedhand.com>
To: Mike Rapoport <mike@...pulab.co.il>
Cc: Anton Vorontsov <avorontsov@...mvista.com>,
LKML <linux-kernel@...r.kernel.org>,
eric miao <eric.miao@...vell.com>, cbou@...l.ru,
David Woodhouse <dwmw2@...radead.org>,
Jonathan Cameron <jic23@....ac.uk>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH 2/2] Add Dialog DA9030 battery charger driver
On Sun, Dec 21, 2008 at 10:29:01AM +0200, Mike Rapoport wrote:
> Samuel,
>
> Samuel Ortiz wrote:
> > On Thu, Dec 18, 2008 at 11:55:50PM +0300, Anton Vorontsov wrote:
> >> Hi all,
> >>
> >> On Thu, Dec 18, 2008 at 01:36:28PM +0200, Mike Rapoport wrote:
> >> [...]
> >>>> 2 remarks though:
> >>>> 1) I'd like to get Anton Ack on it.
> >> Samuel, as it depends on the MFD part, feel free to merge it into your
> >> tree.
> >>
> >> Acked-by: Anton Vorontsov <cbouatmailru@...il.com>
> > Thanks Anton, I just applied Mike's latest version of the patch.
>
> I've fixed the points Anton has raised. Would you prefer me to resend the entire
> patch or send you incremental patch with fixes?
I'd prefer to get the whole patch, thanks.
Cheers,
Samuel.
> > Cheers,
> > Samuel.
> >
> >
> >>>> 2) This patch wont build, as the Makefile is trying to build da903x_battery.o
> >>>> while da9030_battery.c is created. I guess it'd make sense to rename it
> >>>> da903x_battery.c.
> >>> Last minute changes...
> >>> I actually prefer to keep it da9030 for now because I have no idea how much
> >>> DA9034 charger differs from DA9030.
> >>> So, here's the updated patch that fixes Kconfig and Makefile entries and
> >>> addresses the points Andrew raised at [1]
> >> Mike,
> >>
> >> Thanks for the patch, looks really good. Few comments down below.
> >>
> >> [...]
> >>> +++ b/drivers/power/da9030_battery.c
> >>> @@ -0,0 +1,593 @@
> >>> +/*
> >>> + * Battery charger driver for Dialog Semiconductor DA9030
> >>> + *
> >>> + * Copyright (C) 2008 Compulab, Ltd.
> >>> + * Mike Rapoport <mike@...pulab.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.
> >>> + */
> >>> +
> >> The code should explicitly include all the needed headers.
> >>
> >> #include <linux/kernel.h> (for container_of, sprintf, ...)
> >> #include <linux/init.h> (initcalls)
> >> #include <linux/types.h> (uint8_t)
> >> #include <linux/device.h> (struct device)
> >> #include <linux/workqueue.h> (delayedwork)
> >>
> >> ^^^ This is the only real comment. All the rest are nitpicks,
> >> which you can freely ignore if you like.
> >>
> >>> +#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>
> >>> +
> >>> +#define DA9030_STATUS_CHDET (1 << 3)
> >>> +
> >>> +#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 */
> >>> + int chdet:1;
> >> In kernel we can use bool type, and true/false constants.
> >>
> >>> + uint8_t fault;
> >>> + int mA;
> >>> + int mV;
> >>> + int 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
> >>> +
> >> (1)
> >>
> >>> +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, 0, charger,
> >>> + &bat_debug_fops);
> >>> + return charger->debug_file;
> >>> +}
> >>> +
> >>> +static void da9030_bat_remove_debugfs(struct da9030_charger *charger)
> >>> +{
> >>> + debugfs_remove(charger->debug_file);
> >>> +}
> >> I'd put an empty line here, or remove empty line at (1). Just for
> >> consistency.
> >>
> >>> +#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 = 0;
> >> = 0 isn't necessary here.
> >>
> >>> +
> >>> + 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);
> >>> +}
> >>> +
> >>> +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 {
> >>> + 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) {
> >> I'd write it as:
> >>
> >> if (charger->is_on)
> >> return;
> >> the-rest;
> >>
> >> Saves one indent level.
> >>
> >>> + 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);
> >>> + int status;
> >>> +
> >>> + switch (event) {
> >>> + case DA9030_EVENT_CHDET:
> >>> + status = da903x_query_status(charger->master,
> >>> + DA9030_STATUS_CHDET);
> >>> + da9030_set_charge(charger, status);
> >>> + 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);;
> >> One semicolon is enough.
> >>
> >>> +};
> >>> +
> >>> +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. */
> >> I would suggest using canonical-style comments:
> >>
> >> /*
> >> * Not a big deal though, I'm
> >> * just nitpicking. ;-)
> >> */
> >>
> >> Thanks,
> >>
> >> --
> >> Anton Vorontsov
> >> email: cbouatmailru@...il.com
> >> irc://irc.freenode.net/bd2
> >
>
> --
> Sincerely yours,
> Mike.
>
--
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