diff options
Diffstat (limited to 'drivers/power/max8925_power.c')
| -rw-r--r-- | drivers/power/max8925_power.c | 534 |
1 files changed, 534 insertions, 0 deletions
diff --git a/drivers/power/max8925_power.c b/drivers/power/max8925_power.c new file mode 100644 index 0000000..a1b4410 --- /dev/null +++ b/drivers/power/max8925_power.c @@ -0,0 +1,534 @@ +/* + * Battery driver for Maxim MAX8925 + * + * Copyright (c) 2009-2010 Marvell International Ltd. + * Haojian Zhuang <haojian.zhuang@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 inserted\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 inserted\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_info(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 int start_measure(struct max8925_power_info *info, int type) +{ + 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); + + 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"); |