mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-14 02:30:37 +02:00
29ec26ff1b
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@21438 3c298f89-4303-0410-b956-a3cf2f4a3e73
442 lines
12 KiB
Diff
442 lines
12 KiB
Diff
From 83f97dcbcc93584a7d7930b6fe06562691bd865a Mon Sep 17 00:00:00 2001
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From: Lars-Peter Clausen <lars@metafoo.de>
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Date: Sat, 24 Apr 2010 12:28:54 +0200
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Subject: [PATCH] Add jz4740 battery driver
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---
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drivers/power/Kconfig | 11 +
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drivers/power/Makefile | 1 +
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drivers/power/jz4740-battery.c | 359 ++++++++++++++++++++++++++++++++++
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include/linux/power/jz4740-battery.h | 24 +++
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4 files changed, 395 insertions(+), 0 deletions(-)
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create mode 100644 drivers/power/jz4740-battery.c
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create mode 100644 include/linux/power/jz4740-battery.h
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diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
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index faaa9b4..2f4e51f 100644
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--- a/drivers/power/Kconfig
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+++ b/drivers/power/Kconfig
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@@ -131,4 +131,15 @@ 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 JZ4720/JZ4740 battery"
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+ depends on SOC_JZ4740
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+ depends on JZ4740_ADC
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+ help
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+ Say Y to enable support for the battery on Ingenic JZ4720/JZ4740 based
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+ boards.
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+
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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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+
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endif # POWER_SUPPLY
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diff --git a/drivers/power/Makefile b/drivers/power/Makefile
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index a2ba7c8..3b6b971 100644
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--- a/drivers/power/Makefile
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+++ b/drivers/power/Makefile
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@@ -32,3 +32,4 @@ obj-$(CONFIG_BATTERY_BQ27x00) += bq27x00_battery.o
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obj-$(CONFIG_BATTERY_DA9030) += da9030_battery.o
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obj-$(CONFIG_BATTERY_MAX17040) += max17040_battery.o
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obj-$(CONFIG_CHARGER_PCF50633) += pcf50633-charger.o
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+obj-$(CONFIG_BATTERY_JZ4740) += jz4740-battery.o
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diff --git a/drivers/power/jz4740-battery.c b/drivers/power/jz4740-battery.c
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new file mode 100644
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index 0000000..c89b9f7
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--- /dev/null
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+++ b/drivers/power/jz4740-battery.c
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@@ -0,0 +1,359 @@
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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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+
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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/spinlock.h>
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+
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+#include <linux/delay.h>
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+#include <linux/gpio.h>
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+#include <linux/power_supply.h>
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+
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+#include <linux/power/jz4740-battery.h>
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+#include <linux/jz4740-adc.h>
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+
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+struct jz_battery {
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+ struct jz_battery_platform_data *pdata;
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+
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+ int charge_irq;
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+
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+ int status;
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+ long voltage;
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+
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+ struct power_supply battery;
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+ struct delayed_work work;
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+};
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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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+
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+static long jz_battery_read_voltage(struct jz_battery *jz_battery)
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+{
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+ struct device *adc = jz_battery->battery.dev->parent->parent;
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+ enum jz_adc_battery_scale scale;
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+
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+ if (jz_battery->pdata->info.voltage_max_design > 2500000)
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+ scale = JZ_ADC_BATTERY_SCALE_7V5;
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+ else
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+ scale = JZ_ADC_BATTERY_SCALE_2V5;
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+
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+ return jz4740_adc_read_battery_voltage(adc, scale);
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+}
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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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+
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+ voltage = jz_battery_read_voltage(jz_battery);
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+
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+ if (voltage < 0)
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+ return voltage;
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+
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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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+
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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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+
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+ return ret;
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+}
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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,
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+ 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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+
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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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+
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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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+
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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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+
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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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+
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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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+ return IRQ_HANDLED;
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+}
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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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+ long voltage_difference;
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+ bool has_changed = 0;
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+
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+ if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
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+ int is_charging;
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+
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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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+
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+ if (status != jz_battery->status) {
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+ jz_battery->status = status;
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+ has_changed = 1;
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+ }
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+ }
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+
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+ voltage = jz_battery_read_voltage(jz_battery);
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+ voltage_difference = voltage - jz_battery->voltage;
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+ if (voltage_difference > 50000 || voltage_difference < 50000) {
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+ jz_battery->voltage = voltage;
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+ has_changed = 1;
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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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+
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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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+
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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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+
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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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+
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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.platform_data;
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+ struct jz_battery *jz_battery;
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+ struct power_supply *battery;
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+
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+ if (!pdev->dev.platform_data) {
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+ dev_err(&pdev->dev, "No platform data\n");
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+ return -EINVAL;
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+ }
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+
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+ jz_battery = kzalloc(sizeof(*jz_battery), GFP_KERNEL);
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+
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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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+
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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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+
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+ jz_battery->pdata = pdata;
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+
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+ INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
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+
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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;
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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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+
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+ jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);
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+
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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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+
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+
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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_irq;
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+ }
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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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+
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+ return 0;
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+
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+err_free_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:
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+ kfree(jz_battery);
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+ return ret;
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+}
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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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+
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+ cancel_delayed_work_sync(&jz_battery->work);
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+
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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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+
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+ power_supply_unregister(&jz_battery->battery);
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+
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+ return 0;
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+}
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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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+
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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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+
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+ return 0;
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+}
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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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+
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+ schedule_delayed_work(&jz_battery->work, 0);
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+
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+ return 0;
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+}
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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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+
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+#define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops)
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+
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+#else
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+#define JZ_BATTERY_PM_OPS NULL
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+#endif
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+
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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 = {
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+ .name = "jz4740-battery",
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+ .owner = THIS_MODULE,
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+ .pm = JZ_BATTERY_PM_OPS,
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+ },
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+};
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+
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+static int __init jz_battery_init(void)
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+{
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+ return platform_driver_register(&jz_battery_driver);
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+}
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+module_init(jz_battery_init);
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+
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+static void __exit jz_battery_exit(void)
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+{
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+ platform_driver_unregister(&jz_battery_driver);
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+}
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+module_exit(jz_battery_exit);
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+
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+MODULE_ALIAS("platform:jz4740-battery");
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+MODULE_LICENSE("GPL");
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+MODULE_AUTHOR("Jiejing Zhang <kzjeef@gmail.com>");
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+MODULE_DESCRIPTION("JZ4720/JZ4740 SoC battery driver");
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diff --git a/include/linux/power/jz4740-battery.h b/include/linux/power/jz4740-battery.h
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new file mode 100644
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index 0000000..19c9610
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--- /dev/null
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+++ b/include/linux/power/jz4740-battery.h
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@@ -0,0 +1,24 @@
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+/*
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+ * Copyright (C) 2009, Jiejing Zhang <kzjeef@gmail.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; if not, write to the Free Software Foundation, Inc.,
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+ * 675 Mass Ave, Cambridge, MA 02139, USA.
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+ *
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+ */
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+
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+#ifndef __JZ4740_BATTERY_H
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+#define __JZ4740_BATTERY_H
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+
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+struct jz_battery_platform_data {
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+ struct power_supply_info info;
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+ int gpio_charge; /* GPIO port of Charger state */
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+ int gpio_charge_active_low;
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+};
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+
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+#endif
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--
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1.5.6.5
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