486 lines
12 KiB
C
486 lines
12 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-5x00
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*
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* Copyright (C) 2009 Thomas Kunze
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*
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* based on tosa_battery.c
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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/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/driver.h>
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#include <linux/gpio/machine.h>
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#include <linux/gpio/consumer.h>
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#include <linux/mfd/ucb1x00.h>
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#include <asm/mach/sharpsl_param.h>
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#include <asm/mach-types.h>
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#include <mach/collie.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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static struct ucb1x00 *ucb;
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struct collie_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 collie_bat *bat);
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struct gpio_desc *gpio_full;
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struct gpio_desc *gpio_charge_on;
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int technology;
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struct gpio_desc *gpio_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 *gpio_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 collie_bat collie_bat_main;
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static unsigned long collie_read_bat(struct collie_bat *bat)
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{
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unsigned long value = 0;
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if (!bat->gpio_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->gpio_bat, 1);
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msleep(5);
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ucb1x00_adc_enable(ucb);
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value = ucb1x00_adc_read(ucb, bat->adc_bat, UCB_SYNC);
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ucb1x00_adc_disable(ucb);
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gpiod_set_value(bat->gpio_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 collie_read_temp(struct collie_bat *bat)
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{
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unsigned long value = 0;
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if (!bat->gpio_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->gpio_temp, 1);
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msleep(5);
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ucb1x00_adc_enable(ucb);
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value = ucb1x00_adc_read(ucb, bat->adc_temp, UCB_SYNC);
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ucb1x00_adc_disable(ucb);
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gpiod_set_value(bat->gpio_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 collie_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 collie_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 = collie_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 = collie_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 void collie_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 collie_bat_gpio_isr(int irq, void *data)
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{
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pr_info("collie_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 collie_bat_update(struct collie_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->gpio_charge_on, 1);
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mdelay(15);
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}
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if (gpiod_get_value(bat->gpio_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 = collie_read_bat(bat);
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gpiod_set_value(bat->gpio_charge_on, 0);
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bat->status = POWER_SUPPLY_STATUS_FULL;
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} else {
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gpiod_set_value(bat->gpio_charge_on, 1);
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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->gpio_charge_on, 0);
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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 collie_bat_work(struct work_struct *work)
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{
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collie_bat_update(&collie_bat_main);
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}
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static enum power_supply_property collie_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_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_VOLTAGE_MAX,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_TEMP,
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};
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static enum power_supply_property collie_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_VOLTAGE_MAX,
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POWER_SUPPLY_PROP_PRESENT,
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};
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static const struct power_supply_desc collie_bat_main_desc = {
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.name = "main-battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = collie_bat_main_props,
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.num_properties = ARRAY_SIZE(collie_bat_main_props),
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.get_property = collie_bat_get_property,
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.external_power_changed = collie_bat_external_power_changed,
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.use_for_apm = 1,
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};
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static struct collie_bat collie_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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.gpio_full = NULL,
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.gpio_charge_on = NULL,
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.technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
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.gpio_bat = NULL,
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.adc_bat = UCB_ADC_INP_AD1,
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.adc_bat_divider = 155,
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.bat_max = 4310000,
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.bat_min = 1551 * 1000000 / 414,
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.gpio_temp = NULL,
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.adc_temp = UCB_ADC_INP_AD0,
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.adc_temp_divider = 10000,
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};
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static const struct power_supply_desc collie_bat_bu_desc = {
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.name = "backup-battery",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = collie_bat_bu_props,
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.num_properties = ARRAY_SIZE(collie_bat_bu_props),
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.get_property = collie_bat_get_property,
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.external_power_changed = collie_bat_external_power_changed,
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};
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static struct collie_bat collie_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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.gpio_full = NULL,
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.gpio_charge_on = NULL,
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.technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
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.gpio_bat = NULL,
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.adc_bat = UCB_ADC_INP_AD1,
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.adc_bat_divider = 155,
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.bat_max = 3000000,
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.bat_min = 1900000,
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.gpio_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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/* Obtained but unused GPIO */
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static struct gpio_desc *collie_mbat_low;
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#ifdef CONFIG_PM
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static int wakeup_enabled;
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static int collie_bat_suspend(struct ucb1x00_dev *dev)
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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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if (device_may_wakeup(&dev->ucb->dev) &&
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collie_bat_main.status == POWER_SUPPLY_STATUS_CHARGING)
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wakeup_enabled = !enable_irq_wake(gpiod_to_irq(collie_bat_main.gpio_full));
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else
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wakeup_enabled = 0;
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return 0;
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}
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static int collie_bat_resume(struct ucb1x00_dev *dev)
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{
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if (wakeup_enabled)
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disable_irq_wake(gpiod_to_irq(collie_bat_main.gpio_full));
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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 collie_bat_suspend NULL
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#define collie_bat_resume NULL
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#endif
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static int collie_bat_probe(struct ucb1x00_dev *dev)
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{
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int ret;
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struct power_supply_config psy_main_cfg = {}, psy_bu_cfg = {};
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struct gpio_chip *gc = &dev->ucb->gpio;
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if (!machine_is_collie())
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return -ENODEV;
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ucb = dev->ucb;
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/* Obtain all the main battery GPIOs */
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collie_bat_main.gpio_full = gpiod_get(&dev->ucb->dev,
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"main battery full",
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GPIOD_IN);
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if (IS_ERR(collie_bat_main.gpio_full))
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return PTR_ERR(collie_bat_main.gpio_full);
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collie_mbat_low = gpiod_get(&dev->ucb->dev,
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"main battery low",
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GPIOD_IN);
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if (IS_ERR(collie_mbat_low)) {
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ret = PTR_ERR(collie_mbat_low);
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goto err_put_gpio_full;
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}
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collie_bat_main.gpio_charge_on = gpiod_get(&dev->ucb->dev,
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"main charge on",
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GPIOD_OUT_LOW);
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if (IS_ERR(collie_bat_main.gpio_charge_on)) {
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ret = PTR_ERR(collie_bat_main.gpio_charge_on);
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goto err_put_mbat_low;
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}
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/* COLLIE_GPIO_MBAT_ON = GPIO 7 on the UCB (TC35143) */
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collie_bat_main.gpio_bat = gpiochip_request_own_desc(gc,
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7,
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"main battery",
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GPIO_ACTIVE_HIGH,
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GPIOD_OUT_LOW);
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if (IS_ERR(collie_bat_main.gpio_bat)) {
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ret = PTR_ERR(collie_bat_main.gpio_bat);
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goto err_put_gpio_charge_on;
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}
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/* COLLIE_GPIO_TMP_ON = GPIO 9 on the UCB (TC35143) */
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collie_bat_main.gpio_temp = gpiochip_request_own_desc(gc,
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9,
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"main battery temp",
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GPIO_ACTIVE_HIGH,
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GPIOD_OUT_LOW);
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if (IS_ERR(collie_bat_main.gpio_temp)) {
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ret = PTR_ERR(collie_bat_main.gpio_temp);
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goto err_free_gpio_bat;
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}
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/*
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* Obtain the backup battery COLLIE_GPIO_BBAT_ON which is
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* GPIO 8 on the UCB (TC35143)
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*/
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collie_bat_bu.gpio_bat = gpiochip_request_own_desc(gc,
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8,
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"backup battery",
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GPIO_ACTIVE_HIGH,
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GPIOD_OUT_LOW);
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if (IS_ERR(collie_bat_bu.gpio_bat)) {
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ret = PTR_ERR(collie_bat_bu.gpio_bat);
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goto err_free_gpio_temp;
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}
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mutex_init(&collie_bat_main.work_lock);
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INIT_WORK(&bat_work, collie_bat_work);
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psy_main_cfg.drv_data = &collie_bat_main;
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collie_bat_main.psy = power_supply_register(&dev->ucb->dev,
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&collie_bat_main_desc,
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&psy_main_cfg);
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if (IS_ERR(collie_bat_main.psy)) {
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ret = PTR_ERR(collie_bat_main.psy);
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goto err_psy_reg_main;
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}
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psy_bu_cfg.drv_data = &collie_bat_bu;
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collie_bat_bu.psy = power_supply_register(&dev->ucb->dev,
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&collie_bat_bu_desc,
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&psy_bu_cfg);
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if (IS_ERR(collie_bat_bu.psy)) {
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ret = PTR_ERR(collie_bat_bu.psy);
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goto err_psy_reg_bu;
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}
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ret = request_irq(gpio_to_irq(COLLIE_GPIO_CO),
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collie_bat_gpio_isr,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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"main full", &collie_bat_main);
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if (ret)
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goto err_irq;
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device_init_wakeup(&ucb->dev, 1);
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schedule_work(&bat_work);
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return 0;
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err_irq:
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power_supply_unregister(collie_bat_bu.psy);
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err_psy_reg_bu:
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power_supply_unregister(collie_bat_main.psy);
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err_psy_reg_main:
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/* see comment in collie_bat_remove */
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cancel_work_sync(&bat_work);
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gpiochip_free_own_desc(collie_bat_bu.gpio_bat);
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err_free_gpio_temp:
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gpiochip_free_own_desc(collie_bat_main.gpio_temp);
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err_free_gpio_bat:
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gpiochip_free_own_desc(collie_bat_main.gpio_bat);
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err_put_gpio_charge_on:
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gpiod_put(collie_bat_main.gpio_charge_on);
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err_put_mbat_low:
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gpiod_put(collie_mbat_low);
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err_put_gpio_full:
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gpiod_put(collie_bat_main.gpio_full);
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return ret;
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}
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static void collie_bat_remove(struct ucb1x00_dev *dev)
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{
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free_irq(gpio_to_irq(COLLIE_GPIO_CO), &collie_bat_main);
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power_supply_unregister(collie_bat_bu.psy);
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power_supply_unregister(collie_bat_main.psy);
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/* These are obtained from the machine */
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gpiod_put(collie_bat_main.gpio_full);
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gpiod_put(collie_mbat_low);
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gpiod_put(collie_bat_main.gpio_charge_on);
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/* These are directly from the UCB so let's free them */
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gpiochip_free_own_desc(collie_bat_main.gpio_bat);
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gpiochip_free_own_desc(collie_bat_main.gpio_temp);
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gpiochip_free_own_desc(collie_bat_bu.gpio_bat);
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/*
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* Now cancel the bat_work. We won't get any more schedules,
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* since all sources (isr and external_power_changed) are
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* unregistered now.
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*/
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cancel_work_sync(&bat_work);
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}
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static struct ucb1x00_driver collie_bat_driver = {
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.add = collie_bat_probe,
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.remove = collie_bat_remove,
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.suspend = collie_bat_suspend,
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.resume = collie_bat_resume,
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};
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static int __init collie_bat_init(void)
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{
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return ucb1x00_register_driver(&collie_bat_driver);
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}
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static void __exit collie_bat_exit(void)
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{
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ucb1x00_unregister_driver(&collie_bat_driver);
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}
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module_init(collie_bat_init);
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module_exit(collie_bat_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Thomas Kunze");
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MODULE_DESCRIPTION("Collie battery driver");
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