--- /dev/null
+/*
+ * 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->rev < WM8350_REV_G)
+ 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 void wm8350_charger_handler(struct wm8350 *wm8350, int irq, void *data)
+{
+ struct wm8350_power *power = &wm8350->power;
+ struct wm8350_charger_policy *policy = power->policy;
+
+ switch (irq) {
+ case WM8350_IRQ_CHG_BAT_HOT:
+ dev_err(wm8350->dev, "battery too hot\n");
+ break;
+ case WM8350_IRQ_CHG_BAT_COLD:
+ dev_err(wm8350->dev, "battery too cold\n");
+ break;
+ 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");
+ break;
+ case WM8350_IRQ_CHG_END:
+ power_supply_changed(&power->battery);
+ break;
+ case WM8350_IRQ_CHG_START:
+ 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);
+ }
+}
+
+/*********************************************************************
+ * 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_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;
+ 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,
+};
+
+/*********************************************************************
+ * 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, NULL);
+ wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
+ wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD,
+ wm8350_charger_handler, NULL);
+ wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
+ wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL,
+ wm8350_charger_handler, NULL);
+ wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
+ wm8350_register_irq(wm8350, WM8350_IRQ_CHG_TO,
+ wm8350_charger_handler, NULL);
+ wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_TO);
+ wm8350_register_irq(wm8350, WM8350_IRQ_CHG_END,
+ wm8350_charger_handler, NULL);
+ wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_END);
+ wm8350_register_irq(wm8350, WM8350_IRQ_CHG_START,
+ wm8350_charger_handler, NULL);
+ wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_START);
+ wm8350_register_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY,
+ wm8350_charger_handler, NULL);
+ wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY);
+ wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9,
+ wm8350_charger_handler, NULL);
+ wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
+ wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1,
+ wm8350_charger_handler, NULL);
+ wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
+ wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85,
+ wm8350_charger_handler, NULL);
+ wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
+
+ /* and supply change events */
+ wm8350_register_irq(wm8350, WM8350_IRQ_EXT_USB_FB,
+ wm8350_charger_handler, NULL);
+ wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
+ wm8350_register_irq(wm8350, WM8350_IRQ_EXT_WALL_FB,
+ wm8350_charger_handler, NULL);
+ wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
+ wm8350_register_irq(wm8350, WM8350_IRQ_EXT_BAT_FB,
+ wm8350_charger_handler, NULL);
+ wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
+}
+
+static void free_charger_irq(struct wm8350 *wm8350)
+{
+ wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
+ wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
+ wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
+ wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
+ wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
+ wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
+ wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_TO);
+ wm8350_free_irq(wm8350, WM8350_IRQ_CHG_TO);
+ wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_END);
+ wm8350_free_irq(wm8350, WM8350_IRQ_CHG_END);
+ wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_START);
+ wm8350_free_irq(wm8350, WM8350_IRQ_CHG_START);
+ wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
+ wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
+ wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
+ wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
+ wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
+ wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
+ wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
+ wm8350_free_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
+ wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
+ wm8350_free_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
+ wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
+ wm8350_free_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
+}
+
+static __devinit 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 __devexit 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 = __devexit_p(wm8350_power_remove),
+ .driver = {
+ .name = "wm8350-power",
+ },
+};
+
+static int __init wm8350_power_init(void)
+{
+ return platform_driver_register(&wm8350_power_driver);
+}
+module_init(wm8350_power_init);
+
+static void __exit wm8350_power_exit(void)
+{
+ platform_driver_unregister(&wm8350_power_driver);
+}
+module_exit(wm8350_power_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Power supply driver for WM8350");
+MODULE_ALIAS("platform:wm8350-power");
projects / linux-2.6-omap-h63xx.git / commitdiff