[PATCH] power_supply: enable power supply of max8925
Haojian Zhuang
haojian.zhuang at marvell.com
Mon Jan 25 10:38:35 EST 2010
MAX8925 is a PMIC that contains charger component
Signed-off-by: Haojian Zhuang <haojian.zhuang at marvell.com>
---
drivers/power/Kconfig | 7 +
drivers/power/Makefile | 1 +
drivers/power/max8925_power.c | 564 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 572 insertions(+), 0 deletions(-)
create mode 100644 drivers/power/max8925_power.c
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index d4b3d67..9070dcb 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -29,6 +29,13 @@ config APM_POWER
Say Y here to enable support APM status emulation using
battery class devices.
+config MAX8925_POWER
+ tristate "MAX8925 battery charger support"
+ depends on MFD_MAX8925
+ help
+ Say Y here to enable support for the battery charger in the Maxim
+ MAX8925 PMIC.
+
config WM831X_BACKUP
tristate "WM831X backup battery charger support"
depends on MFD_WM831X
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index 573597c..a2ba7c8 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_POWER_SUPPLY) += power_supply.o
obj-$(CONFIG_PDA_POWER) += pda_power.o
obj-$(CONFIG_APM_POWER) += apm_power.o
+obj-$(CONFIG_MAX8925_POWER) += max8925_power.o
obj-$(CONFIG_WM831X_BACKUP) += wm831x_backup.o
obj-$(CONFIG_WM831X_POWER) += wm831x_power.o
obj-$(CONFIG_WM8350_POWER) += wm8350_power.o
diff --git a/drivers/power/max8925_power.c b/drivers/power/max8925_power.c
new file mode 100644
index 0000000..d2213cc
--- /dev/null
+++ b/drivers/power/max8925_power.c
@@ -0,0 +1,564 @@
+/*
+ * Battery driver for Maxim MAX8925
+ *
+ * Copyright (c) 2009-2010 Marvell International Ltd.
+ * Haojian Zhuang <haojian.zhuang at marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/mfd/max8925.h>
+
+/* registers in GPM */
+#define MAX8925_OUT5VEN 0x54
+#define MAX8925_OUT3VEN 0x58
+#define MAX8925_CHG_CNTL1 0x7c
+
+/* bits definition */
+#define MAX8925_CHG_STAT_VSYSLOW (1 << 0)
+#define MAX8925_CHG_STAT_MODE_MASK (3 << 2)
+#define MAX8925_CHG_STAT_EN_MASK (1 << 4)
+#define MAX8925_CHG_MBDET (1 << 1)
+#define MAX8925_CHG_AC_RANGE_MASK (3 << 6)
+
+/* registers in ADC */
+#define MAX8925_ADC_RES_CNFG1 0x06
+#define MAX8925_ADC_AVG_CNFG1 0x07
+#define MAX8925_ADC_ACQ_CNFG1 0x08
+#define MAX8925_ADC_ACQ_CNFG2 0x09
+/* 2 bytes registers in below. MSB is 1st, LSB is 2nd. */
+#define MAX8925_ADC_AUX2 0x62
+#define MAX8925_ADC_VCHG 0x64
+#define MAX8925_ADC_VBBATT 0x66
+#define MAX8925_ADC_VMBATT 0x68
+#define MAX8925_ADC_ISNS 0x6a
+#define MAX8925_ADC_THM 0x6c
+#define MAX8925_ADC_TDIE 0x6e
+#define MAX8925_CMD_AUX2 0xc8
+#define MAX8925_CMD_VCHG 0xd0
+#define MAX8925_CMD_VBBATT 0xd8
+#define MAX8925_CMD_VMBATT 0xe0
+#define MAX8925_CMD_ISNS 0xe8
+#define MAX8925_CMD_THM 0xf0
+#define MAX8925_CMD_TDIE 0xf8
+
+enum {
+ MEASURE_AUX2,
+ MEASURE_VCHG,
+ MEASURE_VBBATT,
+ MEASURE_VMBATT,
+ MEASURE_ISNS,
+ MEASURE_THM,
+ MEASURE_TDIE,
+ MEASURE_MAX,
+};
+
+struct max8925_power_info {
+ struct max8925_chip *chip;
+ struct i2c_client *gpm;
+ struct i2c_client *adc;
+
+ struct power_supply ac;
+ struct power_supply usb;
+ struct power_supply battery;
+ int irq_base;
+ unsigned ac_online:1;
+ unsigned usb_online:1;
+ unsigned bat_online:1;
+ unsigned chg_mode:2;
+ unsigned batt_detect:1; /* detecing MB by ID pin */
+ unsigned topoff_threshold:2;
+ unsigned fast_charge:3;
+
+ int (*set_charger) (int);
+};
+
+static int __set_charger(struct max8925_power_info *info, int enable)
+{
+ struct max8925_chip *chip = info->chip;
+ if (enable) {
+ /* enable charger in platform */
+ if (info->set_charger)
+ info->set_charger(1);
+ /* enable charger */
+ max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 0);
+ } else {
+ /* disable charge */
+ max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
+ if (info->set_charger)
+ info->set_charger(0);
+ }
+ dev_dbg(chip->dev, "%s\n", (enable) ? "Enable charger"
+ : "Disable charger");
+ return 0;
+}
+
+static irqreturn_t max8925_charger_handler(int irq, void *data)
+{
+ struct max8925_power_info *info = (struct max8925_power_info *)data;
+ struct max8925_chip *chip = info->chip;
+
+ switch (irq - chip->irq_base) {
+ case MAX8925_IRQ_VCHG_DC_R:
+ info->ac_online = 1;
+ __set_charger(info, 1);
+ dev_dbg(chip->dev, "Adapter is insertion\n");
+ break;
+ case MAX8925_IRQ_VCHG_DC_F:
+ info->ac_online = 0;
+ __set_charger(info, 0);
+ dev_dbg(chip->dev, "Adapter is removal\n");
+ break;
+ case MAX8925_IRQ_VCHG_USB_R:
+ info->usb_online = 1;
+ __set_charger(info, 1);
+ dev_dbg(chip->dev, "USB is insertion\n");
+ break;
+ case MAX8925_IRQ_VCHG_USB_F:
+ info->usb_online = 0;
+ __set_charger(info, 0);
+ dev_dbg(chip->dev, "USB is removal\n");
+ break;
+ case MAX8925_IRQ_VCHG_THM_OK_F:
+ /* Battery is not ready yet */
+ dev_dbg(chip->dev, "Battery temperature is out of range\n");
+ case MAX8925_IRQ_VCHG_DC_OVP:
+ dev_dbg(chip->dev, "Error detection\n");
+ __set_charger(info, 0);
+ break;
+ case MAX8925_IRQ_VCHG_THM_OK_R:
+ /* Battery is ready now */
+ dev_dbg(chip->dev, "Battery temperature is in range\n");
+ break;
+ case MAX8925_IRQ_VCHG_SYSLOW_R:
+ /* VSYS is low */
+ dev_dbg(chip->dev, "Sys power is too low\n");
+ break;
+ case MAX8925_IRQ_VCHG_SYSLOW_F:
+ dev_dbg(chip->dev, "Sys power is above low threshold\n");
+ break;
+ case MAX8925_IRQ_VCHG_DONE:
+ __set_charger(info, 0);
+ dev_dbg(chip->dev, "Charging is done\n");
+ break;
+ case MAX8925_IRQ_VCHG_TOPOFF:
+ dev_dbg(chip->dev, "Charging in top-off mode\n");
+ break;
+ case MAX8925_IRQ_VCHG_TMR_FAULT:
+ __set_charger(info, 0);
+ dev_dbg(chip->dev, "Safe timer is expired\n");
+ break;
+ case MAX8925_IRQ_VCHG_RST:
+ __set_charger(info, 0);
+ dev_dbg(chip->dev, "Charger is reset\n");
+ break;
+ }
+ return IRQ_HANDLED;
+}
+
+static ssize_t charger_state_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct max8925_power_info *info = dev_get_drvdata(dev);
+ char *charge = NULL;
+ int ret;
+
+ ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
+ ret = (ret & MAX8925_CHG_STAT_MODE_MASK) >> 2;
+ switch (ret) {
+ case 1:
+ charge = "Fast charging";
+ break;
+ case 0:
+ case 2:
+ charge = "Trickle charging";
+ break;
+ case 3:
+ charge = "None charging";
+ break;
+ }
+ return sprintf(buf, "%s\n", charge);
+}
+
+static DEVICE_ATTR(charger_state, 0444, charger_state_show, NULL);
+
+static int start_measure(struct max8925_power_info *info, int type)
+{
+ struct max8925_chip *chip = info->chip;
+ unsigned char buf[2] = {0, 0};
+ int meas_reg = 0, ret;
+
+ switch (type) {
+ case MEASURE_VCHG:
+ meas_reg = MAX8925_ADC_VCHG;
+ break;
+ case MEASURE_VBBATT:
+ meas_reg = MAX8925_ADC_VBBATT;
+ break;
+ case MEASURE_VMBATT:
+ meas_reg = MAX8925_ADC_VMBATT;
+ break;
+ case MEASURE_ISNS:
+ meas_reg = MAX8925_ADC_ISNS;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ max8925_bulk_read(info->adc, meas_reg, 2, buf);
+ ret = (buf[0] << 4) | (buf[1] >> 4);
+
+ return ret;
+}
+
+static int max8925_ac_get_prop(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
+ int ret = 0;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = info->ac_online;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ if (info->ac_online) {
+ ret = start_measure(info, MEASURE_VCHG);
+ if (ret >= 0) {
+ val->intval = ret << 1; /* unit is mV */
+ goto out;
+ }
+ }
+ ret = -ENODATA;
+ break;
+ default:
+ ret = -ENODEV;
+ break;
+ }
+out:
+ return ret;
+}
+
+static enum power_supply_property max8925_ac_props[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+};
+
+static int max8925_usb_get_prop(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
+ int ret = 0;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = info->usb_online;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ if (info->usb_online) {
+ ret = start_measure(info, MEASURE_VCHG);
+ if (ret >= 0) {
+ val->intval = ret << 1; /* unit is mV */
+ goto out;
+ }
+ }
+ ret = -ENODATA;
+ break;
+ default:
+ ret = -ENODEV;
+ break;
+ }
+out:
+ return ret;
+}
+
+static enum power_supply_property max8925_usb_props[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+};
+
+static int max8925_bat_get_prop(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct max8925_power_info *info = dev_get_drvdata(psy->dev->parent);
+ long long int tmp = 0;
+ int ret = 0;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = info->bat_online;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ if (info->bat_online) {
+ ret = start_measure(info, MEASURE_VMBATT);
+ if (ret >= 0) {
+ val->intval = ret << 1; /* unit is mV */
+ ret = 0;
+ break;
+ }
+ }
+ ret = -ENODATA;
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ if (info->bat_online) {
+ ret = start_measure(info, MEASURE_ISNS);
+ if (ret >= 0) {
+ tmp = (long long int)ret * 6250 / 4096 - 3125;
+ ret = (int)tmp;
+ val->intval = 0;
+ if (ret > 0)
+ val->intval = ret; /* unit is mA */
+ ret = 0;
+ break;
+ }
+ }
+ ret = -ENODATA;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_TYPE:
+ if (!info->bat_online) {
+ ret = -ENODATA;
+ break;
+ }
+ ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
+ ret = (ret & MAX8925_CHG_STAT_MODE_MASK) >> 2;
+ switch (ret) {
+ case 1:
+ val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
+ break;
+ case 0:
+ case 2:
+ val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
+ break;
+ case 3:
+ val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
+ break;
+ }
+ ret = 0;
+ break;
+ case POWER_SUPPLY_PROP_STATUS:
+ if (!info->bat_online) {
+ ret = -ENODATA;
+ break;
+ }
+ ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
+ if (info->usb_online || info->ac_online) {
+ val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ if (ret & MAX8925_CHG_STAT_EN_MASK)
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+ } else
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+ ret = 0;
+ break;
+ default:
+ ret = -ENODEV;
+ break;
+ }
+ return ret;
+}
+
+static enum power_supply_property max8925_battery_props[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CHARGE_TYPE,
+ POWER_SUPPLY_PROP_STATUS,
+};
+
+#define REQUEST_IRQ(_irq, _name) \
+do { \
+ ret = request_threaded_irq(chip->irq_base + _irq, NULL, \
+ max8925_charger_handler, \
+ IRQF_ONESHOT, _name, info); \
+ if (ret) \
+ dev_err(chip->dev, "Failed to request IRQ #%d: %d\n", \
+ _irq, ret); \
+} while (0)
+
+static __devinit int max8925_init_charger(struct max8925_chip *chip,
+ struct max8925_power_info *info)
+{
+ int ret;
+
+ REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp");
+ REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove");
+ REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert");
+ REQUEST_IRQ(MAX8925_IRQ_VCHG_USB_OVP, "usb-ovp");
+ REQUEST_IRQ(MAX8925_IRQ_VCHG_USB_F, "usb-remove");
+ REQUEST_IRQ(MAX8925_IRQ_VCHG_USB_R, "usb-insert");
+ REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_R, "batt-temp-in-range");
+ REQUEST_IRQ(MAX8925_IRQ_VCHG_THM_OK_F, "batt-temp-out-range");
+ REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_F, "vsys-high");
+ REQUEST_IRQ(MAX8925_IRQ_VCHG_SYSLOW_R, "vsys-low");
+ REQUEST_IRQ(MAX8925_IRQ_VCHG_RST, "charger-reset");
+ REQUEST_IRQ(MAX8925_IRQ_VCHG_DONE, "charger-done");
+ REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff");
+ REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire");
+
+ info->ac_online = 0;
+ info->usb_online = 0;
+ info->bat_online = 0;
+ ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
+ if (ret >= 0) {
+ /*
+ * If battery detection is enabled, ID pin of battery is
+ * connected to MBDET pin of MAX8925. It could be used to
+ * detect battery presence.
+ * Otherwise, we have to assume that battery is always on.
+ */
+ if (info->batt_detect)
+ info->bat_online = (ret & MAX8925_CHG_MBDET) ? 0 : 1;
+ else
+ info->bat_online = 1;
+ if (ret & MAX8925_CHG_AC_RANGE_MASK)
+ info->ac_online = 1;
+ else
+ info->ac_online = 0;
+ }
+ /* disable charge */
+ max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 1 << 7, 1 << 7);
+ /* set charging current in charge topoff mode */
+ max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 3 << 5,
+ info->topoff_threshold << 5);
+ /* set charing current in fast charge mode */
+ max8925_set_bits(info->gpm, MAX8925_CHG_CNTL1, 7, info->fast_charge);
+
+ return 0;
+}
+
+static __devexit int max8925_deinit_charger(struct max8925_power_info *info)
+{
+ struct max8925_chip *chip = info->chip;
+ int irq;
+
+ irq = chip->irq_base + MAX8925_IRQ_VCHG_DC_OVP;
+ for (; irq <= chip->irq_base + MAX8925_IRQ_VCHG_TMR_FAULT; irq++)
+ free_irq(irq, info);
+
+ return 0;
+}
+
+static __devinit int max8925_power_probe(struct platform_device *pdev)
+{
+ struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
+ struct max8925_platform_data *max8925_pdata;
+ struct max8925_power_pdata *pdata = NULL;
+ struct max8925_power_info *info;
+ int ret;
+
+ if (pdev->dev.parent->platform_data) {
+ max8925_pdata = pdev->dev.parent->platform_data;
+ pdata = max8925_pdata->power;
+ }
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "platform data isn't assigned to "
+ "power supply\n");
+ return -EINVAL;
+ }
+
+ info = kzalloc(sizeof(struct max8925_power_info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+ info->chip = chip;
+ info->gpm = chip->i2c;
+ info->adc = chip->adc;
+
+ info->ac.name = "max8925-ac";
+ info->ac.type = POWER_SUPPLY_TYPE_MAINS;
+ info->ac.properties = max8925_ac_props;
+ info->ac.num_properties = ARRAY_SIZE(max8925_ac_props);
+ info->ac.get_property = max8925_ac_get_prop;
+ ret = power_supply_register(&pdev->dev, &info->ac);
+ if (ret)
+ goto out;
+ info->ac.dev->parent = &pdev->dev;
+
+ info->usb.name = "max8925-usb";
+ info->usb.type = POWER_SUPPLY_TYPE_USB;
+ info->usb.properties = max8925_usb_props;
+ info->usb.num_properties = ARRAY_SIZE(max8925_usb_props);
+ info->usb.get_property = max8925_usb_get_prop;
+ ret = power_supply_register(&pdev->dev, &info->usb);
+ if (ret)
+ goto out_usb;
+ info->usb.dev->parent = &pdev->dev;
+
+ info->battery.name = "max8925-battery";
+ info->battery.type = POWER_SUPPLY_TYPE_BATTERY;
+ info->battery.properties = max8925_battery_props;
+ info->battery.num_properties = ARRAY_SIZE(max8925_battery_props);
+ info->battery.get_property = max8925_bat_get_prop;
+ ret = power_supply_register(&pdev->dev, &info->battery);
+ if (ret)
+ goto out_battery;
+ info->battery.dev->parent = &pdev->dev;
+
+ info->batt_detect = pdata->batt_detect;
+ info->topoff_threshold = pdata->topoff_threshold;
+ info->fast_charge = pdata->fast_charge;
+ info->set_charger = pdata->set_charger;
+ dev_set_drvdata(&pdev->dev, info);
+ platform_set_drvdata(pdev, info);
+
+ ret = device_create_file(&pdev->dev, &dev_attr_charger_state);
+ if (ret < 0)
+ dev_warn(chip->dev, "failed to add charge sysfs: %d\n", ret);
+ max8925_init_charger(chip, info);
+ return 0;
+out_battery:
+ power_supply_unregister(&info->battery);
+out_usb:
+ power_supply_unregister(&info->ac);
+out:
+ kfree(info);
+ return ret;
+}
+
+static __devexit int max8925_power_remove(struct platform_device *pdev)
+{
+ struct max8925_power_info *info = platform_get_drvdata(pdev);
+
+ if (info) {
+ power_supply_unregister(&info->ac);
+ power_supply_unregister(&info->usb);
+ power_supply_unregister(&info->battery);
+ max8925_deinit_charger(info);
+ kfree(info);
+ }
+ return 0;
+}
+
+static struct platform_driver max8925_power_driver = {
+ .probe = max8925_power_probe,
+ .remove = __devexit_p(max8925_power_remove),
+ .driver = {
+ .name = "max8925-power",
+ },
+};
+
+static int __init max8925_power_init(void)
+{
+ return platform_driver_register(&max8925_power_driver);
+}
+module_init(max8925_power_init);
+
+static void __exit max8925_power_exit(void)
+{
+ platform_driver_unregister(&max8925_power_driver);
+}
+module_exit(max8925_power_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Power supply driver for MAX8925");
+MODULE_ALIAS("platform:max8925-power");
--
1.5.6.5
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