513 lines
14 KiB
C
513 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Battery and Power Management code for the Sharp SL-6000x
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*
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* Copyright (c) 2005 Dirk Opfer
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* Copyright (c) 2008 Dmitry Baryshkov
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/power_supply.h>
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#include <linux/wm97xx.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/gpio/consumer.h>
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#include <asm/mach-types.h>
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static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
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static struct work_struct bat_work;
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struct tosa_bat {
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int status;
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struct power_supply *psy;
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int full_chrg;
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struct mutex work_lock; /* protects data */
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bool (*is_present)(struct tosa_bat *bat);
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struct gpio_desc *gpiod_full;
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struct gpio_desc *gpiod_charge_off;
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int technology;
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struct gpio_desc *gpiod_bat;
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int adc_bat;
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int adc_bat_divider;
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int bat_max;
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int bat_min;
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struct gpio_desc *gpiod_temp;
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int adc_temp;
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int adc_temp_divider;
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};
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static struct gpio_desc *jacket_detect;
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static struct tosa_bat tosa_bat_main;
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static struct tosa_bat tosa_bat_jacket;
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static unsigned long tosa_read_bat(struct tosa_bat *bat)
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{
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unsigned long value = 0;
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if (!bat->gpiod_bat || bat->adc_bat < 0)
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return 0;
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mutex_lock(&bat_lock);
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gpiod_set_value(bat->gpiod_bat, 1);
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msleep(5);
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value = wm97xx_read_aux_adc(dev_get_drvdata(bat->psy->dev.parent),
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bat->adc_bat);
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gpiod_set_value(bat->gpiod_bat, 0);
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mutex_unlock(&bat_lock);
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value = value * 1000000 / bat->adc_bat_divider;
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return value;
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}
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static unsigned long tosa_read_temp(struct tosa_bat *bat)
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{
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unsigned long value = 0;
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if (!bat->gpiod_temp || bat->adc_temp < 0)
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return 0;
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mutex_lock(&bat_lock);
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gpiod_set_value(bat->gpiod_temp, 1);
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msleep(5);
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value = wm97xx_read_aux_adc(dev_get_drvdata(bat->psy->dev.parent),
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bat->adc_temp);
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gpiod_set_value(bat->gpiod_temp, 0);
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mutex_unlock(&bat_lock);
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value = value * 10000 / bat->adc_temp_divider;
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return value;
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}
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static int tosa_bat_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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int ret = 0;
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struct tosa_bat *bat = power_supply_get_drvdata(psy);
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if (bat->is_present && !bat->is_present(bat)
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&& psp != POWER_SUPPLY_PROP_PRESENT) {
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return -ENODEV;
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}
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = bat->status;
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break;
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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val->intval = bat->technology;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = tosa_read_bat(bat);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MAX:
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if (bat->full_chrg == -1)
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val->intval = bat->bat_max;
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else
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val->intval = bat->full_chrg;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
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val->intval = bat->bat_max;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
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val->intval = bat->bat_min;
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break;
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case POWER_SUPPLY_PROP_TEMP:
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val->intval = tosa_read_temp(bat);
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = bat->is_present ? bat->is_present(bat) : 1;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static bool tosa_jacket_bat_is_present(struct tosa_bat *bat)
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{
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return gpiod_get_value(jacket_detect) == 0;
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}
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static void tosa_bat_external_power_changed(struct power_supply *psy)
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{
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schedule_work(&bat_work);
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}
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static irqreturn_t tosa_bat_gpio_isr(int irq, void *data)
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{
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pr_info("tosa_bat_gpio irq\n");
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schedule_work(&bat_work);
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return IRQ_HANDLED;
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}
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static void tosa_bat_update(struct tosa_bat *bat)
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{
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int old;
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struct power_supply *psy = bat->psy;
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mutex_lock(&bat->work_lock);
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old = bat->status;
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if (bat->is_present && !bat->is_present(bat)) {
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printk(KERN_NOTICE "%s not present\n", psy->desc->name);
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bat->status = POWER_SUPPLY_STATUS_UNKNOWN;
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bat->full_chrg = -1;
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} else if (power_supply_am_i_supplied(psy)) {
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if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
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gpiod_set_value(bat->gpiod_charge_off, 0);
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mdelay(15);
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}
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if (gpiod_get_value(bat->gpiod_full)) {
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if (old == POWER_SUPPLY_STATUS_CHARGING ||
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bat->full_chrg == -1)
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bat->full_chrg = tosa_read_bat(bat);
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gpiod_set_value(bat->gpiod_charge_off, 1);
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bat->status = POWER_SUPPLY_STATUS_FULL;
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} else {
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gpiod_set_value(bat->gpiod_charge_off, 0);
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bat->status = POWER_SUPPLY_STATUS_CHARGING;
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}
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} else {
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gpiod_set_value(bat->gpiod_charge_off, 1);
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bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
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}
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if (old != bat->status)
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power_supply_changed(psy);
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mutex_unlock(&bat->work_lock);
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}
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static void tosa_bat_work(struct work_struct *work)
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{
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tosa_bat_update(&tosa_bat_main);
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tosa_bat_update(&tosa_bat_jacket);
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}
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static enum power_supply_property tosa_bat_main_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_VOLTAGE_MAX,
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POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_PRESENT,
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};
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static enum power_supply_property tosa_bat_bu_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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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_VOLTAGE_MAX_DESIGN,
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POWER_SUPPLY_PROP_PRESENT,
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};
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static const struct power_supply_desc tosa_bat_main_desc = {
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.name = "main-battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = tosa_bat_main_props,
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.num_properties = ARRAY_SIZE(tosa_bat_main_props),
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.get_property = tosa_bat_get_property,
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.external_power_changed = tosa_bat_external_power_changed,
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.use_for_apm = 1,
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};
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static const struct power_supply_desc tosa_bat_jacket_desc = {
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.name = "jacket-battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = tosa_bat_main_props,
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.num_properties = ARRAY_SIZE(tosa_bat_main_props),
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.get_property = tosa_bat_get_property,
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.external_power_changed = tosa_bat_external_power_changed,
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};
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static const struct power_supply_desc tosa_bat_bu_desc = {
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.name = "backup-battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = tosa_bat_bu_props,
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.num_properties = ARRAY_SIZE(tosa_bat_bu_props),
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.get_property = tosa_bat_get_property,
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.external_power_changed = tosa_bat_external_power_changed,
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};
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static struct tosa_bat tosa_bat_main = {
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.status = POWER_SUPPLY_STATUS_DISCHARGING,
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.full_chrg = -1,
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.psy = NULL,
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.gpiod_full = NULL,
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.gpiod_charge_off = NULL,
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.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
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.gpiod_bat = NULL,
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.adc_bat = WM97XX_AUX_ID3,
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.adc_bat_divider = 414,
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.bat_max = 4310000,
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.bat_min = 1551 * 1000000 / 414,
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.gpiod_temp = NULL,
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.adc_temp = WM97XX_AUX_ID2,
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.adc_temp_divider = 10000,
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};
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static struct tosa_bat tosa_bat_jacket = {
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.status = POWER_SUPPLY_STATUS_DISCHARGING,
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.full_chrg = -1,
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.psy = NULL,
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.is_present = tosa_jacket_bat_is_present,
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.gpiod_full = NULL,
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.gpiod_charge_off = NULL,
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.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
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.gpiod_bat = NULL,
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.adc_bat = WM97XX_AUX_ID3,
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.adc_bat_divider = 414,
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.bat_max = 4310000,
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.bat_min = 1551 * 1000000 / 414,
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.gpiod_temp = NULL,
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.adc_temp = WM97XX_AUX_ID2,
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.adc_temp_divider = 10000,
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};
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static struct tosa_bat tosa_bat_bu = {
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.status = POWER_SUPPLY_STATUS_UNKNOWN,
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.full_chrg = -1,
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.psy = NULL,
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.gpiod_full = NULL,
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.gpiod_charge_off = NULL,
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.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
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.gpiod_bat = NULL,
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.adc_bat = WM97XX_AUX_ID4,
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.adc_bat_divider = 1266,
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.gpiod_temp = NULL,
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.adc_temp = -1,
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.adc_temp_divider = -1,
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};
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#ifdef CONFIG_PM
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static int tosa_bat_suspend(struct platform_device *dev, pm_message_t state)
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{
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/* flush all pending status updates */
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flush_work(&bat_work);
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return 0;
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}
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static int tosa_bat_resume(struct platform_device *dev)
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{
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/* things may have changed while we were away */
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schedule_work(&bat_work);
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return 0;
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}
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#else
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#define tosa_bat_suspend NULL
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#define tosa_bat_resume NULL
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#endif
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static int tosa_bat_probe(struct platform_device *pdev)
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{
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int ret;
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struct power_supply_config main_psy_cfg = {},
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jacket_psy_cfg = {},
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bu_psy_cfg = {};
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struct device *dev = &pdev->dev;
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struct gpio_desc *dummy;
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if (!machine_is_tosa())
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return -ENODEV;
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/* Main charging control GPIOs */
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tosa_bat_main.gpiod_charge_off = devm_gpiod_get(dev, "main charge off", GPIOD_OUT_HIGH);
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if (IS_ERR(tosa_bat_main.gpiod_charge_off))
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return dev_err_probe(dev, PTR_ERR(tosa_bat_main.gpiod_charge_off),
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"no main charger GPIO\n");
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tosa_bat_jacket.gpiod_charge_off = devm_gpiod_get(dev, "jacket charge off", GPIOD_OUT_HIGH);
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if (IS_ERR(tosa_bat_jacket.gpiod_charge_off))
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return dev_err_probe(dev, PTR_ERR(tosa_bat_jacket.gpiod_charge_off),
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"no jacket charger GPIO\n");
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/* Per-battery output check (routes battery voltage to ADC) */
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tosa_bat_main.gpiod_bat = devm_gpiod_get(dev, "main battery", GPIOD_OUT_LOW);
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if (IS_ERR(tosa_bat_main.gpiod_bat))
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return dev_err_probe(dev, PTR_ERR(tosa_bat_main.gpiod_bat),
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"no main battery GPIO\n");
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tosa_bat_jacket.gpiod_bat = devm_gpiod_get(dev, "jacket battery", GPIOD_OUT_LOW);
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if (IS_ERR(tosa_bat_jacket.gpiod_bat))
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return dev_err_probe(dev, PTR_ERR(tosa_bat_jacket.gpiod_bat),
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"no jacket battery GPIO\n");
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tosa_bat_bu.gpiod_bat = devm_gpiod_get(dev, "backup battery", GPIOD_OUT_LOW);
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if (IS_ERR(tosa_bat_bu.gpiod_bat))
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return dev_err_probe(dev, PTR_ERR(tosa_bat_bu.gpiod_bat),
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"no backup battery GPIO\n");
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/* Battery full detect GPIOs (using PXA SoC GPIOs) */
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tosa_bat_main.gpiod_full = devm_gpiod_get(dev, "main battery full", GPIOD_IN);
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if (IS_ERR(tosa_bat_main.gpiod_full))
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return dev_err_probe(dev, PTR_ERR(tosa_bat_main.gpiod_full),
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"no main battery full GPIO\n");
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tosa_bat_jacket.gpiod_full = devm_gpiod_get(dev, "jacket battery full", GPIOD_IN);
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if (IS_ERR(tosa_bat_jacket.gpiod_full))
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return dev_err_probe(dev, PTR_ERR(tosa_bat_jacket.gpiod_full),
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"no jacket battery full GPIO\n");
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/* Battery temperature GPIOs (routes thermistor voltage to ADC) */
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tosa_bat_main.gpiod_temp = devm_gpiod_get(dev, "main battery temp", GPIOD_OUT_LOW);
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if (IS_ERR(tosa_bat_main.gpiod_temp))
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return dev_err_probe(dev, PTR_ERR(tosa_bat_main.gpiod_temp),
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"no main battery temp GPIO\n");
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tosa_bat_jacket.gpiod_temp = devm_gpiod_get(dev, "jacket battery temp", GPIOD_OUT_LOW);
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if (IS_ERR(tosa_bat_jacket.gpiod_temp))
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return dev_err_probe(dev, PTR_ERR(tosa_bat_jacket.gpiod_temp),
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"no jacket battery temp GPIO\n");
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/* Jacket detect GPIO */
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jacket_detect = devm_gpiod_get(dev, "jacket detect", GPIOD_IN);
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if (IS_ERR(jacket_detect))
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return dev_err_probe(dev, PTR_ERR(jacket_detect),
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"no jacket detect GPIO\n");
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/* Battery low indication GPIOs (not used, we just request them) */
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dummy = devm_gpiod_get(dev, "main battery low", GPIOD_IN);
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if (IS_ERR(dummy))
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return dev_err_probe(dev, PTR_ERR(dummy),
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"no main battery low GPIO\n");
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dummy = devm_gpiod_get(dev, "jacket battery low", GPIOD_IN);
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if (IS_ERR(dummy))
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return dev_err_probe(dev, PTR_ERR(dummy),
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"no jacket battery low GPIO\n");
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/* Battery switch GPIO (not used just requested) */
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dummy = devm_gpiod_get(dev, "battery switch", GPIOD_OUT_LOW);
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if (IS_ERR(dummy))
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return dev_err_probe(dev, PTR_ERR(dummy),
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"no battery switch GPIO\n");
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mutex_init(&tosa_bat_main.work_lock);
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mutex_init(&tosa_bat_jacket.work_lock);
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INIT_WORK(&bat_work, tosa_bat_work);
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main_psy_cfg.drv_data = &tosa_bat_main;
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tosa_bat_main.psy = power_supply_register(dev,
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&tosa_bat_main_desc,
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&main_psy_cfg);
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if (IS_ERR(tosa_bat_main.psy)) {
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ret = PTR_ERR(tosa_bat_main.psy);
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goto err_psy_reg_main;
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}
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jacket_psy_cfg.drv_data = &tosa_bat_jacket;
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tosa_bat_jacket.psy = power_supply_register(dev,
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&tosa_bat_jacket_desc,
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&jacket_psy_cfg);
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if (IS_ERR(tosa_bat_jacket.psy)) {
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ret = PTR_ERR(tosa_bat_jacket.psy);
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goto err_psy_reg_jacket;
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}
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bu_psy_cfg.drv_data = &tosa_bat_bu;
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tosa_bat_bu.psy = power_supply_register(dev, &tosa_bat_bu_desc,
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&bu_psy_cfg);
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if (IS_ERR(tosa_bat_bu.psy)) {
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ret = PTR_ERR(tosa_bat_bu.psy);
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goto err_psy_reg_bu;
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}
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ret = request_irq(gpiod_to_irq(tosa_bat_main.gpiod_full),
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tosa_bat_gpio_isr,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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"main full", &tosa_bat_main);
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if (ret)
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goto err_req_main;
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ret = request_irq(gpiod_to_irq(tosa_bat_jacket.gpiod_full),
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tosa_bat_gpio_isr,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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"jacket full", &tosa_bat_jacket);
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if (ret)
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goto err_req_jacket;
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ret = request_irq(gpiod_to_irq(jacket_detect),
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tosa_bat_gpio_isr,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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"jacket detect", &tosa_bat_jacket);
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if (!ret) {
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schedule_work(&bat_work);
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return 0;
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}
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free_irq(gpiod_to_irq(tosa_bat_jacket.gpiod_full), &tosa_bat_jacket);
|
|
err_req_jacket:
|
|
free_irq(gpiod_to_irq(tosa_bat_main.gpiod_full), &tosa_bat_main);
|
|
err_req_main:
|
|
power_supply_unregister(tosa_bat_bu.psy);
|
|
err_psy_reg_bu:
|
|
power_supply_unregister(tosa_bat_jacket.psy);
|
|
err_psy_reg_jacket:
|
|
power_supply_unregister(tosa_bat_main.psy);
|
|
err_psy_reg_main:
|
|
|
|
/* see comment in tosa_bat_remove */
|
|
cancel_work_sync(&bat_work);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int tosa_bat_remove(struct platform_device *dev)
|
|
{
|
|
free_irq(gpiod_to_irq(jacket_detect), &tosa_bat_jacket);
|
|
free_irq(gpiod_to_irq(tosa_bat_jacket.gpiod_full), &tosa_bat_jacket);
|
|
free_irq(gpiod_to_irq(tosa_bat_main.gpiod_full), &tosa_bat_main);
|
|
|
|
power_supply_unregister(tosa_bat_bu.psy);
|
|
power_supply_unregister(tosa_bat_jacket.psy);
|
|
power_supply_unregister(tosa_bat_main.psy);
|
|
|
|
/*
|
|
* Now cancel the bat_work. We won't get any more schedules,
|
|
* since all sources (isr and external_power_changed) are
|
|
* unregistered now.
|
|
*/
|
|
cancel_work_sync(&bat_work);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver tosa_bat_driver = {
|
|
.driver.name = "wm97xx-battery",
|
|
.driver.owner = THIS_MODULE,
|
|
.probe = tosa_bat_probe,
|
|
.remove = tosa_bat_remove,
|
|
.suspend = tosa_bat_suspend,
|
|
.resume = tosa_bat_resume,
|
|
};
|
|
|
|
module_platform_driver(tosa_bat_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Dmitry Baryshkov");
|
|
MODULE_DESCRIPTION("Tosa battery driver");
|
|
MODULE_ALIAS("platform:wm97xx-battery");
|