power_supply: PCF50633 battery charger driver

Signed-off-by: Balaji Rao <balajirrao@openmoko.org>
Cc: Andy Green <andy@openmoko.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Acked-by: Anton Vorontsov <cbouatmailru@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>

1 files changed, 358 insertions, 0 deletions

diff --git a/drivers/power/pcf50633-charger.c b/drivers/power/pcf50633-charger.c
new file mode 100644
index 000000000000..e988ec130fcd
--- /dev/null
+++ b/drivers/power/pcf50633-charger.c
@@ -0,0 +1,358 @@
+/* NXP PCF50633 Main Battery Charger Driver
+ *
+ * (C) 2006-2008 by Openmoko, Inc.
+ * Author: Balaji Rao <balajirrao@openmoko.org>
+ * All rights reserved.
+ *
+ * Broken down from monstrous PCF50633 driver mainly by
+ * Harald Welte, Andy Green and Werner Almesberger
+ *
+ *  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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/sysfs.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+
+#include <linux/mfd/pcf50633/core.h>
+#include <linux/mfd/pcf50633/mbc.h>
+
+struct pcf50633_mbc {
+        struct pcf50633 *pcf;
+
+        int adapter_active;
+        int adapter_online;
+        int usb_active;
+        int usb_online;
+
+        struct power_supply usb;
+        struct power_supply adapter;
+};
+
+int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma)
+{
+        struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
+        int ret = 0;
+        u8 bits;
+
+        if (ma >= 1000)
+                bits = PCF50633_MBCC7_USB_1000mA;
+        else if (ma >= 500)
+                bits = PCF50633_MBCC7_USB_500mA;
+        else if (ma >= 100)
+                bits = PCF50633_MBCC7_USB_100mA;
+        else
+                bits = PCF50633_MBCC7_USB_SUSPEND;
+
+        ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7,
+                                        PCF50633_MBCC7_USB_MASK, bits);
+        if (ret)
+                dev_err(pcf->dev, "error setting usb curlim to %d mA\n", ma);
+        else
+                dev_info(pcf->dev, "usb curlim to %d mA\n", ma);
+
+        power_supply_changed(&mbc->usb);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);
+
+int pcf50633_mbc_get_status(struct pcf50633 *pcf)
+{
+        struct pcf50633_mbc *mbc  = platform_get_drvdata(pcf->mbc_pdev);
+        int status = 0;
+
+        if (mbc->usb_online)
+                status |= PCF50633_MBC_USB_ONLINE;
+        if (mbc->usb_active)
+                status |= PCF50633_MBC_USB_ACTIVE;
+        if (mbc->adapter_online)
+                status |= PCF50633_MBC_ADAPTER_ONLINE;
+        if (mbc->adapter_active)
+                status |= PCF50633_MBC_ADAPTER_ACTIVE;
+
+        return status;
+}
+EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);
+
+void pcf50633_mbc_set_status(struct pcf50633 *pcf, int what, int status)
+{
+        struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
+
+        if (what & PCF50633_MBC_USB_ONLINE)
+                mbc->usb_online = !!status;
+        if (what & PCF50633_MBC_USB_ACTIVE)
+                mbc->usb_active = !!status;
+        if (what & PCF50633_MBC_ADAPTER_ONLINE)
+                mbc->adapter_online = !!status;
+        if (what & PCF50633_MBC_ADAPTER_ACTIVE)
+                mbc->adapter_active = !!status;
+}
+EXPORT_SYMBOL_GPL(pcf50633_mbc_set_status);
+
+static ssize_t
+show_chgmode(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
+
+        u8 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
+        u8 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
+
+        return sprintf(buf, "%d\n", chgmod);
+}
+static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);
+
+static ssize_t
+show_usblim(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
+        u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
+                                                PCF50633_MBCC7_USB_MASK;
+        unsigned int ma;
+
+        if (usblim == PCF50633_MBCC7_USB_1000mA)
+                ma = 1000;
+        else if (usblim == PCF50633_MBCC7_USB_500mA)
+                ma = 500;
+        else if (usblim == PCF50633_MBCC7_USB_100mA)
+                ma = 100;
+        else
+                ma = 0;
+
+        return sprintf(buf, "%u\n", ma);
+}
+
+static ssize_t set_usblim(struct device *dev,
+                struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
+        unsigned long ma;
+        int ret;
+
+        ret = strict_strtoul(buf, 10, &ma);
+        if (ret)
+                return -EINVAL;
+
+        pcf50633_mbc_usb_curlim_set(mbc->pcf, ma);
+
+        return count;
+}
+
+static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);
+
+static struct attribute *pcf50633_mbc_sysfs_entries[] = {
+        &dev_attr_chgmode.attr,
+        &dev_attr_usb_curlim.attr,
+        NULL,
+};
+
+static struct attribute_group mbc_attr_group = {
+        .name   = NULL,                 /* put in device directory */
+        .attrs  = pcf50633_mbc_sysfs_entries,
+};
+
+static void
+pcf50633_mbc_irq_handler(int irq, void *data)
+{
+        struct pcf50633_mbc *mbc = data;
+
+        /* USB */
+        if (irq == PCF50633_IRQ_USBINS) {
+                mbc->usb_online = 1;
+        } else if (irq == PCF50633_IRQ_USBREM) {
+                mbc->usb_online = 0;
+                mbc->usb_active = 0;
+                pcf50633_mbc_usb_curlim_set(mbc->pcf, 0);
+        }
+
+        /* Adapter */
+        if (irq == PCF50633_IRQ_ADPINS) {
+                mbc->adapter_online = 1;
+                mbc->adapter_active = 1;
+        } else if (irq == PCF50633_IRQ_ADPREM) {
+                mbc->adapter_online = 0;
+                mbc->adapter_active = 0;
+        }
+
+        if (irq == PCF50633_IRQ_BATFULL) {
+                mbc->usb_active = 0;
+                mbc->adapter_active = 0;
+        }
+
+        power_supply_changed(&mbc->usb);
+        power_supply_changed(&mbc->adapter);
+
+        if (mbc->pcf->pdata->mbc_event_callback)
+                mbc->pcf->pdata->mbc_event_callback(mbc->pcf, irq);
+}
+
+static int adapter_get_property(struct power_supply *psy,
+                        enum power_supply_property psp,
+                        union power_supply_propval *val)
+{
+        struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, usb);
+        int ret = 0;
+
+        switch (psp) {
+        case POWER_SUPPLY_PROP_ONLINE:
+                val->intval =  mbc->adapter_online;
+                break;
+        default:
+                ret = -EINVAL;
+                break;
+        }
+        return ret;
+}
+
+static int usb_get_property(struct power_supply *psy,
+                        enum power_supply_property psp,
+                        union power_supply_propval *val)
+{
+        struct pcf50633_mbc *mbc = container_of(psy, struct pcf50633_mbc, usb);
+        int ret = 0;
+
+        switch (psp) {
+        case POWER_SUPPLY_PROP_ONLINE:
+                val->intval = mbc->usb_online;
+                break;
+        default:
+                ret = -EINVAL;
+                break;
+        }
+        return ret;
+}
+
+static enum power_supply_property power_props[] = {
+        POWER_SUPPLY_PROP_ONLINE,
+};
+
+static const u8 mbc_irq_handlers[] = {
+        PCF50633_IRQ_ADPINS,
+        PCF50633_IRQ_ADPREM,
+        PCF50633_IRQ_USBINS,
+        PCF50633_IRQ_USBREM,
+        PCF50633_IRQ_BATFULL,
+        PCF50633_IRQ_CHGHALT,
+        PCF50633_IRQ_THLIMON,
+        PCF50633_IRQ_THLIMOFF,
+        PCF50633_IRQ_USBLIMON,
+        PCF50633_IRQ_USBLIMOFF,
+        PCF50633_IRQ_LOWSYS,
+        PCF50633_IRQ_LOWBAT,
+};
+
+static int __devinit pcf50633_mbc_probe(struct platform_device *pdev)
+{
+        struct pcf50633_mbc *mbc;
+        struct pcf50633_subdev_pdata *pdata = pdev->dev.platform_data;
+        int ret;
+        int i;
+        u8 mbcs1;
+
+        mbc = kzalloc(sizeof(*mbc), GFP_KERNEL);
+        if (!mbc)
+                return -ENOMEM;
+
+        platform_set_drvdata(pdev, mbc);
+        mbc->pcf = pdata->pcf;
+
+        /* Set up IRQ handlers */
+        for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
+                pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i],
+                                        pcf50633_mbc_irq_handler, mbc);
+
+        /* Create power supplies */
+        mbc->adapter.name               = "adapter";
+        mbc->adapter.type               = POWER_SUPPLY_TYPE_MAINS;
+        mbc->adapter.properties         = power_props;
+        mbc->adapter.num_properties     = ARRAY_SIZE(power_props);
+        mbc->adapter.get_property       = &adapter_get_property;
+        mbc->adapter.supplied_to        = mbc->pcf->pdata->batteries;
+        mbc->adapter.num_supplicants    = mbc->pcf->pdata->num_batteries;
+
+        mbc->usb.name                   = "usb";
+        mbc->usb.type                   = POWER_SUPPLY_TYPE_USB;
+        mbc->usb.properties             = power_props;
+        mbc->usb.num_properties         = ARRAY_SIZE(power_props);
+        mbc->usb.get_property           = usb_get_property;
+        mbc->usb.supplied_to            = mbc->pcf->pdata->batteries;
+        mbc->usb.num_supplicants        = mbc->pcf->pdata->num_batteries;
+
+        ret = power_supply_register(&pdev->dev, &mbc->adapter);
+        if (ret) {
+                dev_err(mbc->pcf->dev, "failed to register adapter\n");
+                kfree(mbc);
+                return ret;
+        }
+
+        ret = power_supply_register(&pdev->dev, &mbc->usb);
+        if (ret) {
+                dev_err(mbc->pcf->dev, "failed to register usb\n");
+                power_supply_unregister(&mbc->adapter);
+                kfree(mbc);
+                return ret;
+        }
+
+        ret = sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group);
+        if (ret)
+                dev_err(mbc->pcf->dev, "failed to create sysfs entries\n");
+
+        mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
+        if (mbcs1 & PCF50633_MBCS1_USBPRES)
+                pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
+        if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
+                pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);
+
+        return 0;
+}
+
+static int __devexit pcf50633_mbc_remove(struct platform_device *pdev)
+{
+        struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
+        int i;
+
+        /* Remove IRQ handlers */
+        for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
+                pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);
+
+        power_supply_unregister(&mbc->usb);
+        power_supply_unregister(&mbc->adapter);
+
+        kfree(mbc);
+
+        return 0;
+}
+
+static struct platform_driver pcf50633_mbc_driver = {
+        .driver = {
+                .name = "pcf50633-mbc",
+        },
+        .probe = pcf50633_mbc_probe,
+        .remove = __devexit_p(pcf50633_mbc_remove),
+};
+
+static int __init pcf50633_mbc_init(void)
+{
+        return platform_driver_register(&pcf50633_mbc_driver);
+}
+module_init(pcf50633_mbc_init);
+
+static void __exit pcf50633_mbc_exit(void)
+{
+        platform_driver_unregister(&pcf50633_mbc_driver);
+}
+module_exit(pcf50633_mbc_exit);
+
+MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
+MODULE_DESCRIPTION("PCF50633 mbc driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pcf50633-mbc");