| /* |
| * 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/slab.h> |
| #include <linux/of.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; |
| unsigned no_temp_support:1; |
| unsigned no_insert_detect:1; |
| |
| 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 removed\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_cmd; |
| int meas_reg = 0, ret; |
| |
| switch (type) { |
| case MEASURE_VCHG: |
| meas_cmd = MAX8925_CMD_VCHG; |
| meas_reg = MAX8925_ADC_VCHG; |
| break; |
| case MEASURE_VBBATT: |
| meas_cmd = MAX8925_CMD_VBBATT; |
| meas_reg = MAX8925_ADC_VBBATT; |
| break; |
| case MEASURE_VMBATT: |
| meas_cmd = MAX8925_CMD_VMBATT; |
| meas_reg = MAX8925_ADC_VMBATT; |
| break; |
| case MEASURE_ISNS: |
| meas_cmd = MAX8925_CMD_ISNS; |
| meas_reg = MAX8925_ADC_ISNS; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| max8925_reg_write(info->adc, meas_cmd, 0); |
| max8925_bulk_read(info->adc, meas_reg, 2, buf); |
| ret = ((buf[0]<<8) | 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 * 2000; /* unit is uV */ |
| 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 * 2000; /* unit is uV */ |
| 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); |
| 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 * 2000; /* unit is uV */ |
| 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) { |
| /* assume r_sns is 0.02 */ |
| ret = ((ret * 6250) - 3125) /* uA */; |
| 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 int max8925_init_charger(struct max8925_chip *chip, |
| struct max8925_power_info *info) |
| { |
| int ret; |
| |
| REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_OVP, "ac-ovp"); |
| if (!info->no_insert_detect) { |
| REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_F, "ac-remove"); |
| REQUEST_IRQ(MAX8925_IRQ_VCHG_DC_R, "ac-insert"); |
| } |
| if (!info->no_temp_support) { |
| 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->usb_online = 0; |
| info->bat_online = 0; |
| |
| /* check for power - can miss interrupt at boot time */ |
| if (start_measure(info, MEASURE_VCHG) * 2000 > 500000) |
| info->ac_online = 1; |
| else |
| info->ac_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 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; |
| } |
| |
| #ifdef CONFIG_OF |
| static struct max8925_power_pdata * |
| max8925_power_dt_init(struct platform_device *pdev) |
| { |
| struct device_node *nproot = pdev->dev.parent->of_node; |
| struct device_node *np; |
| int batt_detect; |
| int topoff_threshold; |
| int fast_charge; |
| int no_temp_support; |
| int no_insert_detect; |
| struct max8925_power_pdata *pdata; |
| |
| if (!nproot) |
| return pdev->dev.platform_data; |
| |
| np = of_get_child_by_name(nproot, "charger"); |
| if (!np) { |
| dev_err(&pdev->dev, "failed to find charger node\n"); |
| return NULL; |
| } |
| |
| pdata = devm_kzalloc(&pdev->dev, |
| sizeof(struct max8925_power_pdata), |
| GFP_KERNEL); |
| if (!pdata) |
| goto ret; |
| |
| of_property_read_u32(np, "topoff-threshold", &topoff_threshold); |
| of_property_read_u32(np, "batt-detect", &batt_detect); |
| of_property_read_u32(np, "fast-charge", &fast_charge); |
| of_property_read_u32(np, "no-insert-detect", &no_insert_detect); |
| of_property_read_u32(np, "no-temp-support", &no_temp_support); |
| |
| pdata->batt_detect = batt_detect; |
| pdata->fast_charge = fast_charge; |
| pdata->topoff_threshold = topoff_threshold; |
| pdata->no_insert_detect = no_insert_detect; |
| pdata->no_temp_support = no_temp_support; |
| |
| ret: |
| of_node_put(np); |
| return pdata; |
| } |
| #else |
| static struct max8925_power_pdata * |
| max8925_power_dt_init(struct platform_device *pdev) |
| { |
| return pdev->dev.platform_data; |
| } |
| #endif |
| |
| static int max8925_power_probe(struct platform_device *pdev) |
| { |
| struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); |
| struct power_supply_config psy_cfg = {}; /* Only for ac and usb */ |
| struct max8925_power_pdata *pdata = NULL; |
| struct max8925_power_info *info; |
| int ret; |
| |
| pdata = max8925_power_dt_init(pdev); |
| if (!pdata) { |
| dev_err(&pdev->dev, "platform data isn't assigned to " |
| "power supply\n"); |
| return -EINVAL; |
| } |
| |
| info = devm_kzalloc(&pdev->dev, sizeof(struct max8925_power_info), |
| GFP_KERNEL); |
| if (!info) |
| return -ENOMEM; |
| info->chip = chip; |
| info->gpm = chip->i2c; |
| info->adc = chip->adc; |
| platform_set_drvdata(pdev, info); |
| |
| psy_cfg.supplied_to = pdata->supplied_to; |
| psy_cfg.num_supplicants = pdata->num_supplicants; |
| |
| 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, &psy_cfg); |
| 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, &psy_cfg); |
| 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, NULL); |
| 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; |
| info->no_temp_support = pdata->no_temp_support; |
| info->no_insert_detect = pdata->no_insert_detect; |
| |
| max8925_init_charger(chip, info); |
| return 0; |
| out_battery: |
| power_supply_unregister(&info->battery); |
| out_usb: |
| power_supply_unregister(&info->ac); |
| out: |
| return ret; |
| } |
| |
| static 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); |
| } |
| return 0; |
| } |
| |
| static struct platform_driver max8925_power_driver = { |
| .probe = max8925_power_probe, |
| .remove = max8925_power_remove, |
| .driver = { |
| .name = "max8925-power", |
| }, |
| }; |
| |
| module_platform_driver(max8925_power_driver); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("Power supply driver for MAX8925"); |
| MODULE_ALIAS("platform:max8925-power"); |