diff options
Diffstat (limited to 'drivers/power/wm8350_power.c')
| -rw-r--r-- | drivers/power/wm8350_power.c | 540 |
1 files changed, 540 insertions, 0 deletions
diff --git a/drivers/power/wm8350_power.c b/drivers/power/wm8350_power.c new file mode 100644 index 000000000..5c5880664 --- /dev/null +++ b/drivers/power/wm8350_power.c @@ -0,0 +1,540 @@ +/* + * 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, +}; + +static const struct power_supply_desc wm8350_ac_desc = { + .name = "wm8350-ac", + .type = POWER_SUPPLY_TYPE_MAINS, + .properties = wm8350_ac_props, + .num_properties = ARRAY_SIZE(wm8350_ac_props), + .get_property = wm8350_ac_get_prop, +}; + +static const struct power_supply_desc wm8350_battery_desc = { + .name = "wm8350-battery", + .properties = wm8350_bat_props, + .num_properties = ARRAY_SIZE(wm8350_bat_props), + .get_property = wm8350_bat_get_property, + .use_for_apm = 1, +}; + +static const struct power_supply_desc wm8350_usb_desc = { + .name = "wm8350-usb", + .type = POWER_SUPPLY_TYPE_USB, + .properties = wm8350_usb_props, + .num_properties = ARRAY_SIZE(wm8350_usb_props), + .get_property = wm8350_usb_get_prop, +}; + +/********************************************************************* + * 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; + int ret; + + power->ac = power_supply_register(&pdev->dev, &wm8350_ac_desc, NULL); + if (IS_ERR(power->ac)) + return PTR_ERR(power->ac); + + power->battery = power_supply_register(&pdev->dev, &wm8350_battery_desc, + NULL); + if (IS_ERR(power->battery)) { + ret = PTR_ERR(power->battery); + goto battery_failed; + } + + power->usb = power_supply_register(&pdev->dev, &wm8350_usb_desc, NULL); + if (IS_ERR(power->usb)) { + ret = PTR_ERR(power->usb); + 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(power->battery); +battery_failed: + power_supply_unregister(power->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"); |