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POWER: Add JZ4740 battery driver.
Add support for the battery voltage measurement part of the JZ4740 ADC unit. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Acked-by: Anton Vorontsov <cbouatmailru@gmail.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/1416/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Lars-Peter Clausen
Ralf Baechle
parent
7f983ba93d
commit
f6a21388bd
@ -142,4 +142,15 @@ config CHARGER_PCF50633
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help
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Say Y to include support for NXP PCF50633 Main Battery Charger.
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config BATTERY_JZ4740
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tristate "Ingenic JZ4740 battery"
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depends on MACH_JZ4740
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depends on MFD_JZ4740_ADC
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help
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Say Y to enable support for the battery on Ingenic JZ4740 based
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boards.
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This driver can be build as a module. If so, the module will be
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called jz4740-battery.
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endif # POWER_SUPPLY
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@ -34,3 +34,4 @@ obj-$(CONFIG_BATTERY_DA9030) += da9030_battery.o
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obj-$(CONFIG_BATTERY_MAX17040) += max17040_battery.o
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obj-$(CONFIG_BATTERY_Z2) += z2_battery.o
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obj-$(CONFIG_CHARGER_PCF50633) += pcf50633-charger.o
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obj-$(CONFIG_BATTERY_JZ4740) += jz4740-battery.o
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445
drivers/power/jz4740-battery.c
Normal file
445
drivers/power/jz4740-battery.c
Normal file
@ -0,0 +1,445 @@
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/*
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* Battery measurement code for Ingenic JZ SOC.
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*
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* Copyright (C) 2009 Jiejing Zhang <kzjeef@gmail.com>
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* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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*
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* based on tosa_battery.c
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*
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* Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
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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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*/
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/mfd/core.h>
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#include <linux/power_supply.h>
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#include <linux/power/jz4740-battery.h>
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#include <linux/jz4740-adc.h>
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struct jz_battery {
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struct jz_battery_platform_data *pdata;
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struct platform_device *pdev;
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struct resource *mem;
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void __iomem *base;
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int irq;
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int charge_irq;
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struct mfd_cell *cell;
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int status;
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long voltage;
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struct completion read_completion;
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struct power_supply battery;
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struct delayed_work work;
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};
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static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
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{
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return container_of(psy, struct jz_battery, battery);
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}
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static irqreturn_t jz_battery_irq_handler(int irq, void *devid)
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{
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struct jz_battery *battery = devid;
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complete(&battery->read_completion);
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return IRQ_HANDLED;
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}
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static long jz_battery_read_voltage(struct jz_battery *battery)
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{
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unsigned long t;
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unsigned long val;
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long voltage;
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INIT_COMPLETION(battery->read_completion);
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enable_irq(battery->irq);
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battery->cell->enable(battery->pdev);
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t = wait_for_completion_interruptible_timeout(&battery->read_completion,
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HZ);
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if (t > 0) {
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val = readw(battery->base) & 0xfff;
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if (battery->pdata->info.voltage_max_design <= 2500000)
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val = (val * 78125UL) >> 7UL;
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else
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val = ((val * 924375UL) >> 9UL) + 33000;
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voltage = (long)val;
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} else {
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voltage = t ? t : -ETIMEDOUT;
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}
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battery->cell->disable(battery->pdev);
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disable_irq(battery->irq);
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return voltage;
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}
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static int jz_battery_get_capacity(struct power_supply *psy)
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{
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struct jz_battery *jz_battery = psy_to_jz_battery(psy);
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struct power_supply_info *info = &jz_battery->pdata->info;
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long voltage;
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int ret;
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int voltage_span;
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voltage = jz_battery_read_voltage(jz_battery);
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if (voltage < 0)
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return voltage;
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voltage_span = info->voltage_max_design - info->voltage_min_design;
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ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;
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if (ret > 100)
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ret = 100;
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else if (ret < 0)
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ret = 0;
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return ret;
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}
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static int jz_battery_get_property(struct power_supply *psy,
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enum power_supply_property psp, union power_supply_propval *val)
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{
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struct jz_battery *jz_battery = psy_to_jz_battery(psy);
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struct power_supply_info *info = &jz_battery->pdata->info;
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long voltage;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = jz_battery->status;
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break;
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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val->intval = jz_battery->pdata->info.technology;
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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voltage = jz_battery_read_voltage(jz_battery);
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if (voltage < info->voltage_min_design)
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val->intval = POWER_SUPPLY_HEALTH_DEAD;
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else
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val->intval = POWER_SUPPLY_HEALTH_GOOD;
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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val->intval = jz_battery_get_capacity(psy);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = jz_battery_read_voltage(jz_battery);
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if (val->intval < 0)
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return val->intval;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
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val->intval = 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 = info->voltage_min_design;
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = 1;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static void jz_battery_external_power_changed(struct power_supply *psy)
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{
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struct jz_battery *jz_battery = psy_to_jz_battery(psy);
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cancel_delayed_work(&jz_battery->work);
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schedule_delayed_work(&jz_battery->work, 0);
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}
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static irqreturn_t jz_battery_charge_irq(int irq, void *data)
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{
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struct jz_battery *jz_battery = data;
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cancel_delayed_work(&jz_battery->work);
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schedule_delayed_work(&jz_battery->work, 0);
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return IRQ_HANDLED;
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}
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static void jz_battery_update(struct jz_battery *jz_battery)
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{
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int status;
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long voltage;
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bool has_changed = false;
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int is_charging;
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if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
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is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
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is_charging ^= jz_battery->pdata->gpio_charge_active_low;
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if (is_charging)
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status = POWER_SUPPLY_STATUS_CHARGING;
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else
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status = POWER_SUPPLY_STATUS_NOT_CHARGING;
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if (status != jz_battery->status) {
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jz_battery->status = status;
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has_changed = true;
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}
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}
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voltage = jz_battery_read_voltage(jz_battery);
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if (abs(voltage - jz_battery->voltage) < 50000) {
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jz_battery->voltage = voltage;
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has_changed = true;
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}
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if (has_changed)
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power_supply_changed(&jz_battery->battery);
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}
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static enum power_supply_property jz_battery_properties[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_CAPACITY,
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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_MIN_DESIGN,
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POWER_SUPPLY_PROP_PRESENT,
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};
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static void jz_battery_work(struct work_struct *work)
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{
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/* Too small interval will increase system workload */
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const int interval = HZ * 30;
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struct jz_battery *jz_battery = container_of(work, struct jz_battery,
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work.work);
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jz_battery_update(jz_battery);
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schedule_delayed_work(&jz_battery->work, interval);
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}
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static int __devinit jz_battery_probe(struct platform_device *pdev)
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{
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int ret = 0;
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struct jz_battery_platform_data *pdata = pdev->dev.parent->platform_data;
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struct jz_battery *jz_battery;
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struct power_supply *battery;
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jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
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if (!jz_battery) {
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dev_err(&pdev->dev, "Failed to allocate driver structure\n");
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return -ENOMEM;
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}
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jz_battery->cell = pdev->dev.platform_data;
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jz_battery->irq = platform_get_irq(pdev, 0);
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if (jz_battery->irq < 0) {
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ret = jz_battery->irq;
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dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
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goto err_free;
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}
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jz_battery->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!jz_battery->mem) {
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ret = -ENOENT;
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dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
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goto err_free;
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}
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jz_battery->mem = request_mem_region(jz_battery->mem->start,
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resource_size(jz_battery->mem), pdev->name);
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if (!jz_battery->mem) {
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ret = -EBUSY;
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dev_err(&pdev->dev, "Failed to request mmio memory region\n");
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goto err_free;
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}
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jz_battery->base = ioremap_nocache(jz_battery->mem->start,
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resource_size(jz_battery->mem));
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if (!jz_battery->base) {
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ret = -EBUSY;
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dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
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goto err_release_mem_region;
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}
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battery = &jz_battery->battery;
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battery->name = pdata->info.name;
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battery->type = POWER_SUPPLY_TYPE_BATTERY;
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battery->properties = jz_battery_properties;
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battery->num_properties = ARRAY_SIZE(jz_battery_properties);
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battery->get_property = jz_battery_get_property;
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battery->external_power_changed = jz_battery_external_power_changed;
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battery->use_for_apm = 1;
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jz_battery->pdata = pdata;
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jz_battery->pdev = pdev;
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init_completion(&jz_battery->read_completion);
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INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
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ret = request_irq(jz_battery->irq, jz_battery_irq_handler, 0, pdev->name,
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jz_battery);
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if (ret) {
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dev_err(&pdev->dev, "Failed to request irq %d\n", ret);
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goto err_iounmap;
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}
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disable_irq(jz_battery->irq);
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if (gpio_is_valid(pdata->gpio_charge)) {
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ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
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if (ret) {
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dev_err(&pdev->dev, "charger state gpio request failed.\n");
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goto err_free_irq;
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}
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ret = gpio_direction_input(pdata->gpio_charge);
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if (ret) {
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dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
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goto err_free_gpio;
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}
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jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);
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if (jz_battery->charge_irq >= 0) {
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ret = request_irq(jz_battery->charge_irq,
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jz_battery_charge_irq,
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IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
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dev_name(&pdev->dev), jz_battery);
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if (ret) {
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dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
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goto err_free_gpio;
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}
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}
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} else {
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jz_battery->charge_irq = -1;
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}
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if (jz_battery->pdata->info.voltage_max_design <= 2500000)
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jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB,
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JZ_ADC_CONFIG_BAT_MB);
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else
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jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB, 0);
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ret = power_supply_register(&pdev->dev, &jz_battery->battery);
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if (ret) {
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dev_err(&pdev->dev, "power supply battery register failed.\n");
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goto err_free_charge_irq;
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}
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platform_set_drvdata(pdev, jz_battery);
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schedule_delayed_work(&jz_battery->work, 0);
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return 0;
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err_free_charge_irq:
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if (jz_battery->charge_irq >= 0)
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free_irq(jz_battery->charge_irq, jz_battery);
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err_free_gpio:
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if (gpio_is_valid(pdata->gpio_charge))
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gpio_free(jz_battery->pdata->gpio_charge);
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err_free_irq:
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free_irq(jz_battery->irq, jz_battery);
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err_iounmap:
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platform_set_drvdata(pdev, NULL);
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iounmap(jz_battery->base);
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err_release_mem_region:
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release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
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err_free:
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kfree(jz_battery);
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return ret;
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}
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static int __devexit jz_battery_remove(struct platform_device *pdev)
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{
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struct jz_battery *jz_battery = platform_get_drvdata(pdev);
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cancel_delayed_work_sync(&jz_battery->work);
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if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
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if (jz_battery->charge_irq >= 0)
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free_irq(jz_battery->charge_irq, jz_battery);
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gpio_free(jz_battery->pdata->gpio_charge);
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}
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power_supply_unregister(&jz_battery->battery);
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free_irq(jz_battery->irq, jz_battery);
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iounmap(jz_battery->base);
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release_mem_region(jz_battery->mem->start, resource_size(jz_battery->mem));
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return 0;
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}
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#ifdef CONFIG_PM
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static int jz_battery_suspend(struct device *dev)
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{
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struct jz_battery *jz_battery = dev_get_drvdata(dev);
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cancel_delayed_work_sync(&jz_battery->work);
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jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;
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return 0;
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}
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static int jz_battery_resume(struct device *dev)
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{
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struct jz_battery *jz_battery = dev_get_drvdata(dev);
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schedule_delayed_work(&jz_battery->work, 0);
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return 0;
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}
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static const struct dev_pm_ops jz_battery_pm_ops = {
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.suspend = jz_battery_suspend,
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.resume = jz_battery_resume,
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};
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#define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops)
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#else
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#define JZ_BATTERY_PM_OPS NULL
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#endif
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static struct platform_driver jz_battery_driver = {
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.probe = jz_battery_probe,
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.remove = __devexit_p(jz_battery_remove),
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.driver = {
|
||||
.name = "jz4740-battery",
|
||||
.owner = THIS_MODULE,
|
||||
.pm = JZ_BATTERY_PM_OPS,
|
||||
},
|
||||
};
|
||||
|
||||
static int __init jz_battery_init(void)
|
||||
{
|
||||
return platform_driver_register(&jz_battery_driver);
|
||||
}
|
||||
module_init(jz_battery_init);
|
||||
|
||||
static void __exit jz_battery_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&jz_battery_driver);
|
||||
}
|
||||
module_exit(jz_battery_exit);
|
||||
|
||||
MODULE_ALIAS("platform:jz4740-battery");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
|
||||
MODULE_DESCRIPTION("JZ4740 SoC battery driver");
|
||||
24
include/linux/power/jz4740-battery.h
Normal file
24
include/linux/power/jz4740-battery.h
Normal file
@ -0,0 +1,24 @@
|
||||
/*
|
||||
* Copyright (C) 2009, Jiejing Zhang <kzjeef@gmail.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License as published by the
|
||||
* Free Software Foundation; either version 2 of the License, or (at your
|
||||
* option) any later version.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License along
|
||||
* with this program; if not, write to the Free Software Foundation, Inc.,
|
||||
* 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef __JZ4740_BATTERY_H
|
||||
#define __JZ4740_BATTERY_H
|
||||
|
||||
struct jz_battery_platform_data {
|
||||
struct power_supply_info info;
|
||||
int gpio_charge; /* GPIO port of Charger state */
|
||||
int gpio_charge_active_low;
|
||||
};
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user