/* * Battery driver for wm8350 PMIC * * Copyright 2007, 2008 Wolfson Microelectronics PLC. * * Based on OLPC Battery Driver * * Copyright 2006 David Woodhouse <dwmw2@infradead.org> * * 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/platform_device.h> #include <linux/power_supply.h> #include <linux/mfd/wm8350/supply.h> #include <linux/mfd/wm8350/core.h> #include <linux/mfd/wm8350/comparator.h> static int wm8350_read_battery_uvolts(struct wm8350 *wm8350) { return wm8350_read_auxadc(wm8350, WM8350_AUXADC_BATT, 0, 0) * WM8350_AUX_COEFF; } static int wm8350_read_line_uvolts(struct wm8350 *wm8350) { return wm8350_read_auxadc(wm8350, WM8350_AUXADC_LINE, 0, 0) * WM8350_AUX_COEFF; } static int wm8350_read_usb_uvolts(struct wm8350 *wm8350) { return wm8350_read_auxadc(wm8350, WM8350_AUXADC_USB, 0, 0) * WM8350_AUX_COEFF; } #define WM8350_BATT_SUPPLY 1 #define WM8350_USB_SUPPLY 2 #define WM8350_LINE_SUPPLY 4 static inline int wm8350_charge_time_min(struct wm8350 *wm8350, int min) { if (!wm8350->power.rev_g_coeff) return (((min - 30) / 15) & 0xf) << 8; else return (((min - 30) / 30) & 0xf) << 8; } static int wm8350_get_supplies(struct wm8350 *wm8350) { u16 sm, ov, co, chrg; int supplies = 0; sm = wm8350_reg_read(wm8350, WM8350_STATE_MACHINE_STATUS); ov = wm8350_reg_read(wm8350, WM8350_MISC_OVERRIDES); co = wm8350_reg_read(wm8350, WM8350_COMPARATOR_OVERRIDES); chrg = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2); /* USB_SM */ sm = (sm & WM8350_USB_SM_MASK) >> WM8350_USB_SM_SHIFT; /* CHG_ISEL */ chrg &= WM8350_CHG_ISEL_MASK; /* If the USB state machine is active then we're using that with or * without battery, otherwise check for wall supply */ if (((sm == WM8350_USB_SM_100_SLV) || (sm == WM8350_USB_SM_500_SLV) || (sm == WM8350_USB_SM_STDBY_SLV)) && !(ov & WM8350_USB_LIMIT_OVRDE)) supplies = WM8350_USB_SUPPLY; else if (((sm == WM8350_USB_SM_100_SLV) || (sm == WM8350_USB_SM_500_SLV) || (sm == WM8350_USB_SM_STDBY_SLV)) && (ov & WM8350_USB_LIMIT_OVRDE) && (chrg == 0)) supplies = WM8350_USB_SUPPLY | WM8350_BATT_SUPPLY; else if (co & WM8350_WALL_FB_OVRDE) supplies = WM8350_LINE_SUPPLY; else supplies = WM8350_BATT_SUPPLY; return supplies; } static int wm8350_charger_config(struct wm8350 *wm8350, struct wm8350_charger_policy *policy) { u16 reg, eoc_mA, fast_limit_mA; if (!policy) { dev_warn(wm8350->dev, "No charger policy, charger not configured.\n"); return -EINVAL; } /* make sure USB fast charge current is not > 500mA */ if (policy->fast_limit_USB_mA > 500) { dev_err(wm8350->dev, "USB fast charge > 500mA\n"); return -EINVAL; } eoc_mA = WM8350_CHG_EOC_mA(policy->eoc_mA); wm8350_reg_unlock(wm8350); reg = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1) & WM8350_CHG_ENA_R168; wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1, reg | eoc_mA | policy->trickle_start_mV | WM8350_CHG_TRICKLE_TEMP_CHOKE | WM8350_CHG_TRICKLE_USB_CHOKE | WM8350_CHG_FAST_USB_THROTTLE); if (wm8350_get_supplies(wm8350) & WM8350_USB_SUPPLY) { fast_limit_mA = WM8350_CHG_FAST_LIMIT_mA(policy->fast_limit_USB_mA); wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2, policy->charge_mV | policy->trickle_charge_USB_mA | fast_limit_mA | wm8350_charge_time_min(wm8350, policy->charge_timeout)); } else { fast_limit_mA = WM8350_CHG_FAST_LIMIT_mA(policy->fast_limit_mA); wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2, policy->charge_mV | policy->trickle_charge_mA | fast_limit_mA | wm8350_charge_time_min(wm8350, policy->charge_timeout)); } wm8350_reg_lock(wm8350); return 0; } static int wm8350_batt_status(struct wm8350 *wm8350) { u16 state; state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2); state &= WM8350_CHG_STS_MASK; switch (state) { case WM8350_CHG_STS_OFF: return POWER_SUPPLY_STATUS_DISCHARGING; case WM8350_CHG_STS_TRICKLE: case WM8350_CHG_STS_FAST: return POWER_SUPPLY_STATUS_CHARGING; default: return POWER_SUPPLY_STATUS_UNKNOWN; } } static ssize_t charger_state_show(struct device *dev, struct device_attribute *attr, char *buf) { struct wm8350 *wm8350 = dev_get_drvdata(dev); char *charge; int state; state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2) & WM8350_CHG_STS_MASK; switch (state) { case WM8350_CHG_STS_OFF: charge = "Charger Off"; break; case WM8350_CHG_STS_TRICKLE: charge = "Trickle Charging"; break; case WM8350_CHG_STS_FAST: charge = "Fast Charging"; break; default: return 0; } return sprintf(buf, "%s\n", charge); } static DEVICE_ATTR(charger_state, 0444, charger_state_show, NULL); static irqreturn_t wm8350_charger_handler(int irq, void *data) { struct wm8350 *wm8350 = data; struct wm8350_power *power = &wm8350->power; struct wm8350_charger_policy *policy = power->policy; switch (irq - wm8350->irq_base) { case WM8350_IRQ_CHG_BAT_FAIL: dev_err(wm8350->dev, "battery failed\n"); break; case WM8350_IRQ_CHG_TO: dev_err(wm8350->dev, "charger timeout\n"); power_supply_changed(&power->battery); break; case WM8350_IRQ_CHG_BAT_HOT: case WM8350_IRQ_CHG_BAT_COLD: case WM8350_IRQ_CHG_START: case WM8350_IRQ_CHG_END: power_supply_changed(&power->battery); break; case WM8350_IRQ_CHG_FAST_RDY: dev_dbg(wm8350->dev, "fast charger ready\n"); wm8350_charger_config(wm8350, policy); wm8350_reg_unlock(wm8350); wm8350_set_bits(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1, WM8350_CHG_FAST); wm8350_reg_lock(wm8350); break; case WM8350_IRQ_CHG_VBATT_LT_3P9: dev_warn(wm8350->dev, "battery < 3.9V\n"); break; case WM8350_IRQ_CHG_VBATT_LT_3P1: dev_warn(wm8350->dev, "battery < 3.1V\n"); break; case WM8350_IRQ_CHG_VBATT_LT_2P85: dev_warn(wm8350->dev, "battery < 2.85V\n"); break; /* Supply change. We will overnotify but it should do * no harm. */ case WM8350_IRQ_EXT_USB_FB: case WM8350_IRQ_EXT_WALL_FB: wm8350_charger_config(wm8350, policy); case WM8350_IRQ_EXT_BAT_FB: /* Fall through */ power_supply_changed(&power->battery); power_supply_changed(&power->usb); power_supply_changed(&power->ac); break; default: dev_err(wm8350->dev, "Unknown interrupt %d\n", irq); } return IRQ_HANDLED; } /********************************************************************* * AC Power *********************************************************************/ static int wm8350_ac_get_prop(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent); int ret = 0; switch (psp) { case POWER_SUPPLY_PROP_ONLINE: val->intval = !!(wm8350_get_supplies(wm8350) & WM8350_LINE_SUPPLY); break; case POWER_SUPPLY_PROP_VOLTAGE_NOW: val->intval = wm8350_read_line_uvolts(wm8350); break; default: ret = -EINVAL; break; } return ret; } static enum power_supply_property wm8350_ac_props[] = { POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_VOLTAGE_NOW, }; /********************************************************************* * USB Power *********************************************************************/ static int wm8350_usb_get_prop(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent); int ret = 0; switch (psp) { case POWER_SUPPLY_PROP_ONLINE: val->intval = !!(wm8350_get_supplies(wm8350) & WM8350_USB_SUPPLY); break; case POWER_SUPPLY_PROP_VOLTAGE_NOW: val->intval = wm8350_read_usb_uvolts(wm8350); break; default: ret = -EINVAL; break; } return ret; } static enum power_supply_property wm8350_usb_props[] = { POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_VOLTAGE_NOW, }; /********************************************************************* * Battery properties *********************************************************************/ static int wm8350_bat_check_health(struct wm8350 *wm8350) { u16 reg; if (wm8350_read_battery_uvolts(wm8350) < 2850000) return POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; reg = wm8350_reg_read(wm8350, WM8350_CHARGER_OVERRIDES); if (reg & WM8350_CHG_BATT_HOT_OVRDE) return POWER_SUPPLY_HEALTH_OVERHEAT; if (reg & WM8350_CHG_BATT_COLD_OVRDE) return POWER_SUPPLY_HEALTH_COLD; return POWER_SUPPLY_HEALTH_GOOD; } static int wm8350_bat_get_charge_type(struct wm8350 *wm8350) { int state; state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2) & WM8350_CHG_STS_MASK; switch (state) { case WM8350_CHG_STS_OFF: return POWER_SUPPLY_CHARGE_TYPE_NONE; case WM8350_CHG_STS_TRICKLE: return POWER_SUPPLY_CHARGE_TYPE_TRICKLE; case WM8350_CHG_STS_FAST: return POWER_SUPPLY_CHARGE_TYPE_FAST; default: return POWER_SUPPLY_CHARGE_TYPE_UNKNOWN; } } static int wm8350_bat_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent); int ret = 0; switch (psp) { case POWER_SUPPLY_PROP_STATUS: val->intval = wm8350_batt_status(wm8350); break; case POWER_SUPPLY_PROP_ONLINE: val->intval = !!(wm8350_get_supplies(wm8350) & WM8350_BATT_SUPPLY); break; case POWER_SUPPLY_PROP_VOLTAGE_NOW: val->intval = wm8350_read_battery_uvolts(wm8350); break; case POWER_SUPPLY_PROP_HEALTH: val->intval = wm8350_bat_check_health(wm8350); break; case POWER_SUPPLY_PROP_CHARGE_TYPE: val->intval = wm8350_bat_get_charge_type(wm8350); break; default: ret = -EINVAL; break; } return ret; } static enum power_supply_property wm8350_bat_props[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_ONLINE, POWER_SUPPLY_PROP_VOLTAGE_NOW, POWER_SUPPLY_PROP_HEALTH, POWER_SUPPLY_PROP_CHARGE_TYPE, }; /********************************************************************* * Initialisation *********************************************************************/ static void wm8350_init_charger(struct wm8350 *wm8350) { /* register our interest in charger events */ wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT, wm8350_charger_handler, 0, "Battery hot", wm8350); wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD, wm8350_charger_handler, 0, "Battery cold", wm8350); wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL, wm8350_charger_handler, 0, "Battery fail", wm8350); wm8350_register_irq(wm8350, WM8350_IRQ_CHG_TO, wm8350_charger_handler, 0, "Charger timeout", wm8350); wm8350_register_irq(wm8350, WM8350_IRQ_CHG_END, wm8350_charger_handler, 0, "Charge end", wm8350); wm8350_register_irq(wm8350, WM8350_IRQ_CHG_START, wm8350_charger_handler, 0, "Charge start", wm8350); wm8350_register_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY, wm8350_charger_handler, 0, "Fast charge ready", wm8350); wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9, wm8350_charger_handler, 0, "Battery <3.9V", wm8350); wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1, wm8350_charger_handler, 0, "Battery <3.1V", wm8350); wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85, wm8350_charger_handler, 0, "Battery <2.85V", wm8350); /* and supply change events */ wm8350_register_irq(wm8350, WM8350_IRQ_EXT_USB_FB, wm8350_charger_handler, 0, "USB", wm8350); wm8350_register_irq(wm8350, WM8350_IRQ_EXT_WALL_FB, wm8350_charger_handler, 0, "Wall", wm8350); wm8350_register_irq(wm8350, WM8350_IRQ_EXT_BAT_FB, wm8350_charger_handler, 0, "Battery", wm8350); } static void free_charger_irq(struct wm8350 *wm8350) { wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT, wm8350); wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD, wm8350); wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL, wm8350); wm8350_free_irq(wm8350, WM8350_IRQ_CHG_TO, wm8350); wm8350_free_irq(wm8350, WM8350_IRQ_CHG_END, wm8350); wm8350_free_irq(wm8350, WM8350_IRQ_CHG_START, wm8350); wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9, wm8350); wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1, wm8350); wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85, wm8350); wm8350_free_irq(wm8350, WM8350_IRQ_EXT_USB_FB, wm8350); wm8350_free_irq(wm8350, WM8350_IRQ_EXT_WALL_FB, wm8350); wm8350_free_irq(wm8350, WM8350_IRQ_EXT_BAT_FB, wm8350); } static int wm8350_power_probe(struct platform_device *pdev) { struct wm8350 *wm8350 = platform_get_drvdata(pdev); struct wm8350_power *power = &wm8350->power; struct wm8350_charger_policy *policy = power->policy; struct power_supply *usb = &power->usb; struct power_supply *battery = &power->battery; struct power_supply *ac = &power->ac; int ret; ac->name = "wm8350-ac"; ac->type = POWER_SUPPLY_TYPE_MAINS; ac->properties = wm8350_ac_props; ac->num_properties = ARRAY_SIZE(wm8350_ac_props); ac->get_property = wm8350_ac_get_prop; ret = power_supply_register(&pdev->dev, ac); if (ret) return ret; battery->name = "wm8350-battery"; battery->properties = wm8350_bat_props; battery->num_properties = ARRAY_SIZE(wm8350_bat_props); battery->get_property = wm8350_bat_get_property; battery->use_for_apm = 1; ret = power_supply_register(&pdev->dev, battery); if (ret) goto battery_failed; usb->name = "wm8350-usb", usb->type = POWER_SUPPLY_TYPE_USB; usb->properties = wm8350_usb_props; usb->num_properties = ARRAY_SIZE(wm8350_usb_props); usb->get_property = wm8350_usb_get_prop; ret = power_supply_register(&pdev->dev, usb); if (ret) goto usb_failed; ret = device_create_file(&pdev->dev, &dev_attr_charger_state); if (ret < 0) dev_warn(wm8350->dev, "failed to add charge sysfs: %d\n", ret); ret = 0; wm8350_init_charger(wm8350); if (wm8350_charger_config(wm8350, policy) == 0) { wm8350_reg_unlock(wm8350); wm8350_set_bits(wm8350, WM8350_POWER_MGMT_5, WM8350_CHG_ENA); wm8350_reg_lock(wm8350); } return ret; usb_failed: power_supply_unregister(battery); battery_failed: power_supply_unregister(ac); return ret; } static int wm8350_power_remove(struct platform_device *pdev) { struct wm8350 *wm8350 = platform_get_drvdata(pdev); struct wm8350_power *power = &wm8350->power; free_charger_irq(wm8350); device_remove_file(&pdev->dev, &dev_attr_charger_state); power_supply_unregister(&power->battery); power_supply_unregister(&power->ac); power_supply_unregister(&power->usb); return 0; } static struct platform_driver wm8350_power_driver = { .probe = wm8350_power_probe, .remove = wm8350_power_remove, .driver = { .name = "wm8350-power", }, }; module_platform_driver(wm8350_power_driver); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Power supply driver for WM8350"); MODULE_ALIAS("platform:wm8350-power");