542 lines
15 KiB
C
Executable file
542 lines
15 KiB
C
Executable file
/*
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* Battery driver for wm8350 PMIC
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*
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* Copyright 2007, 2008 Wolfson Microelectronics PLC.
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*
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* Based on OLPC Battery Driver
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*
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* Copyright 2006 David Woodhouse <dwmw2@infradead.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/mfd/wm8350/supply.h>
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#include <linux/mfd/wm8350/core.h>
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#include <linux/mfd/wm8350/comparator.h>
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static int wm8350_read_battery_uvolts(struct wm8350 *wm8350)
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{
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return wm8350_read_auxadc(wm8350, WM8350_AUXADC_BATT, 0, 0)
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* WM8350_AUX_COEFF;
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}
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static int wm8350_read_line_uvolts(struct wm8350 *wm8350)
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{
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return wm8350_read_auxadc(wm8350, WM8350_AUXADC_LINE, 0, 0)
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* WM8350_AUX_COEFF;
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}
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static int wm8350_read_usb_uvolts(struct wm8350 *wm8350)
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{
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return wm8350_read_auxadc(wm8350, WM8350_AUXADC_USB, 0, 0)
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* WM8350_AUX_COEFF;
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}
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#define WM8350_BATT_SUPPLY 1
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#define WM8350_USB_SUPPLY 2
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#define WM8350_LINE_SUPPLY 4
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static inline int wm8350_charge_time_min(struct wm8350 *wm8350, int min)
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{
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if (!wm8350->power.rev_g_coeff)
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return (((min - 30) / 15) & 0xf) << 8;
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else
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return (((min - 30) / 30) & 0xf) << 8;
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}
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static int wm8350_get_supplies(struct wm8350 *wm8350)
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{
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u16 sm, ov, co, chrg;
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int supplies = 0;
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sm = wm8350_reg_read(wm8350, WM8350_STATE_MACHINE_STATUS);
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ov = wm8350_reg_read(wm8350, WM8350_MISC_OVERRIDES);
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co = wm8350_reg_read(wm8350, WM8350_COMPARATOR_OVERRIDES);
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chrg = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2);
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/* USB_SM */
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sm = (sm & WM8350_USB_SM_MASK) >> WM8350_USB_SM_SHIFT;
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/* CHG_ISEL */
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chrg &= WM8350_CHG_ISEL_MASK;
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/* If the USB state machine is active then we're using that with or
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* without battery, otherwise check for wall supply */
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if (((sm == WM8350_USB_SM_100_SLV) ||
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(sm == WM8350_USB_SM_500_SLV) ||
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(sm == WM8350_USB_SM_STDBY_SLV))
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&& !(ov & WM8350_USB_LIMIT_OVRDE))
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supplies = WM8350_USB_SUPPLY;
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else if (((sm == WM8350_USB_SM_100_SLV) ||
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(sm == WM8350_USB_SM_500_SLV) ||
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(sm == WM8350_USB_SM_STDBY_SLV))
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&& (ov & WM8350_USB_LIMIT_OVRDE) && (chrg == 0))
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supplies = WM8350_USB_SUPPLY | WM8350_BATT_SUPPLY;
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else if (co & WM8350_WALL_FB_OVRDE)
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supplies = WM8350_LINE_SUPPLY;
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else
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supplies = WM8350_BATT_SUPPLY;
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return supplies;
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}
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static int wm8350_charger_config(struct wm8350 *wm8350,
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struct wm8350_charger_policy *policy)
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{
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u16 reg, eoc_mA, fast_limit_mA;
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if (!policy) {
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dev_warn(wm8350->dev,
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"No charger policy, charger not configured.\n");
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return -EINVAL;
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}
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/* make sure USB fast charge current is not > 500mA */
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if (policy->fast_limit_USB_mA > 500) {
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dev_err(wm8350->dev, "USB fast charge > 500mA\n");
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return -EINVAL;
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}
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eoc_mA = WM8350_CHG_EOC_mA(policy->eoc_mA);
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wm8350_reg_unlock(wm8350);
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reg = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1)
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& WM8350_CHG_ENA_R168;
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wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1,
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reg | eoc_mA | policy->trickle_start_mV |
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WM8350_CHG_TRICKLE_TEMP_CHOKE |
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WM8350_CHG_TRICKLE_USB_CHOKE |
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WM8350_CHG_FAST_USB_THROTTLE);
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if (wm8350_get_supplies(wm8350) & WM8350_USB_SUPPLY) {
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fast_limit_mA =
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WM8350_CHG_FAST_LIMIT_mA(policy->fast_limit_USB_mA);
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wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2,
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policy->charge_mV | policy->trickle_charge_USB_mA |
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fast_limit_mA | wm8350_charge_time_min(wm8350,
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policy->charge_timeout));
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} else {
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fast_limit_mA =
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WM8350_CHG_FAST_LIMIT_mA(policy->fast_limit_mA);
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wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2,
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policy->charge_mV | policy->trickle_charge_mA |
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fast_limit_mA | wm8350_charge_time_min(wm8350,
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policy->charge_timeout));
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}
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wm8350_reg_lock(wm8350);
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return 0;
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}
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static int wm8350_batt_status(struct wm8350 *wm8350)
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{
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u16 state;
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state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2);
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state &= WM8350_CHG_STS_MASK;
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switch (state) {
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case WM8350_CHG_STS_OFF:
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return POWER_SUPPLY_STATUS_DISCHARGING;
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case WM8350_CHG_STS_TRICKLE:
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case WM8350_CHG_STS_FAST:
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return POWER_SUPPLY_STATUS_CHARGING;
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default:
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return POWER_SUPPLY_STATUS_UNKNOWN;
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}
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}
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static ssize_t charger_state_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct wm8350 *wm8350 = dev_get_drvdata(dev);
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char *charge;
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int state;
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state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2) &
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WM8350_CHG_STS_MASK;
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switch (state) {
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case WM8350_CHG_STS_OFF:
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charge = "Charger Off";
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break;
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case WM8350_CHG_STS_TRICKLE:
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charge = "Trickle Charging";
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break;
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case WM8350_CHG_STS_FAST:
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charge = "Fast Charging";
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break;
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default:
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return 0;
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}
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return sprintf(buf, "%s\n", charge);
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}
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static DEVICE_ATTR_RO(charger_state);
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static irqreturn_t wm8350_charger_handler(int irq, void *data)
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{
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struct wm8350 *wm8350 = data;
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struct wm8350_power *power = &wm8350->power;
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struct wm8350_charger_policy *policy = power->policy;
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switch (irq - wm8350->irq_base) {
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case WM8350_IRQ_CHG_BAT_FAIL:
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dev_err(wm8350->dev, "battery failed\n");
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break;
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case WM8350_IRQ_CHG_TO:
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dev_err(wm8350->dev, "charger timeout\n");
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power_supply_changed(power->battery);
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break;
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case WM8350_IRQ_CHG_BAT_HOT:
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case WM8350_IRQ_CHG_BAT_COLD:
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case WM8350_IRQ_CHG_START:
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case WM8350_IRQ_CHG_END:
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power_supply_changed(power->battery);
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break;
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case WM8350_IRQ_CHG_FAST_RDY:
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dev_dbg(wm8350->dev, "fast charger ready\n");
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wm8350_charger_config(wm8350, policy);
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wm8350_reg_unlock(wm8350);
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wm8350_set_bits(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1,
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WM8350_CHG_FAST);
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wm8350_reg_lock(wm8350);
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break;
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case WM8350_IRQ_CHG_VBATT_LT_3P9:
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dev_warn(wm8350->dev, "battery < 3.9V\n");
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break;
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case WM8350_IRQ_CHG_VBATT_LT_3P1:
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dev_warn(wm8350->dev, "battery < 3.1V\n");
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break;
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case WM8350_IRQ_CHG_VBATT_LT_2P85:
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dev_warn(wm8350->dev, "battery < 2.85V\n");
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break;
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/* Supply change. We will overnotify but it should do
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* no harm. */
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case WM8350_IRQ_EXT_USB_FB:
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case WM8350_IRQ_EXT_WALL_FB:
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wm8350_charger_config(wm8350, policy);
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/* Fall through */
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case WM8350_IRQ_EXT_BAT_FB:
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power_supply_changed(power->battery);
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power_supply_changed(power->usb);
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power_supply_changed(power->ac);
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break;
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default:
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dev_err(wm8350->dev, "Unknown interrupt %d\n", irq);
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}
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return IRQ_HANDLED;
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}
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/*********************************************************************
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* AC Power
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*********************************************************************/
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static int wm8350_ac_get_prop(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct wm8350 *wm8350 = dev_get_drvdata(psy->dev.parent);
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int ret = 0;
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = !!(wm8350_get_supplies(wm8350) &
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WM8350_LINE_SUPPLY);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = wm8350_read_line_uvolts(wm8350);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static enum power_supply_property wm8350_ac_props[] = {
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POWER_SUPPLY_PROP_ONLINE,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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};
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/*********************************************************************
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* USB Power
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*********************************************************************/
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static int wm8350_usb_get_prop(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct wm8350 *wm8350 = dev_get_drvdata(psy->dev.parent);
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int ret = 0;
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switch (psp) {
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = !!(wm8350_get_supplies(wm8350) &
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WM8350_USB_SUPPLY);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = wm8350_read_usb_uvolts(wm8350);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static enum power_supply_property wm8350_usb_props[] = {
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POWER_SUPPLY_PROP_ONLINE,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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};
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/*********************************************************************
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* Battery properties
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*********************************************************************/
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static int wm8350_bat_check_health(struct wm8350 *wm8350)
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{
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u16 reg;
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if (wm8350_read_battery_uvolts(wm8350) < 2850000)
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return POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
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reg = wm8350_reg_read(wm8350, WM8350_CHARGER_OVERRIDES);
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if (reg & WM8350_CHG_BATT_HOT_OVRDE)
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return POWER_SUPPLY_HEALTH_OVERHEAT;
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if (reg & WM8350_CHG_BATT_COLD_OVRDE)
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return POWER_SUPPLY_HEALTH_COLD;
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return POWER_SUPPLY_HEALTH_GOOD;
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}
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static int wm8350_bat_get_charge_type(struct wm8350 *wm8350)
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{
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int state;
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state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2) &
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WM8350_CHG_STS_MASK;
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switch (state) {
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case WM8350_CHG_STS_OFF:
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return POWER_SUPPLY_CHARGE_TYPE_NONE;
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case WM8350_CHG_STS_TRICKLE:
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return POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
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case WM8350_CHG_STS_FAST:
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return POWER_SUPPLY_CHARGE_TYPE_FAST;
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default:
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return POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
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}
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}
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static int wm8350_bat_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct wm8350 *wm8350 = dev_get_drvdata(psy->dev.parent);
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int ret = 0;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = wm8350_batt_status(wm8350);
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break;
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = !!(wm8350_get_supplies(wm8350) &
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WM8350_BATT_SUPPLY);
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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val->intval = wm8350_read_battery_uvolts(wm8350);
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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val->intval = wm8350_bat_check_health(wm8350);
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break;
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case POWER_SUPPLY_PROP_CHARGE_TYPE:
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val->intval = wm8350_bat_get_charge_type(wm8350);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static enum power_supply_property wm8350_bat_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_ONLINE,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_CHARGE_TYPE,
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};
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static const struct power_supply_desc wm8350_ac_desc = {
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.name = "wm8350-ac",
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.type = POWER_SUPPLY_TYPE_MAINS,
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.properties = wm8350_ac_props,
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.num_properties = ARRAY_SIZE(wm8350_ac_props),
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.get_property = wm8350_ac_get_prop,
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};
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static const struct power_supply_desc wm8350_battery_desc = {
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.name = "wm8350-battery",
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.properties = wm8350_bat_props,
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.num_properties = ARRAY_SIZE(wm8350_bat_props),
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.get_property = wm8350_bat_get_property,
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.use_for_apm = 1,
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};
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static const struct power_supply_desc wm8350_usb_desc = {
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.name = "wm8350-usb",
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.type = POWER_SUPPLY_TYPE_USB,
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.properties = wm8350_usb_props,
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.num_properties = ARRAY_SIZE(wm8350_usb_props),
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.get_property = wm8350_usb_get_prop,
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};
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/*********************************************************************
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* Initialisation
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*********************************************************************/
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static void wm8350_init_charger(struct wm8350 *wm8350)
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{
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/* register our interest in charger events */
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wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT,
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wm8350_charger_handler, 0, "Battery hot", wm8350);
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wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD,
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wm8350_charger_handler, 0, "Battery cold", wm8350);
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wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL,
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wm8350_charger_handler, 0, "Battery fail", wm8350);
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wm8350_register_irq(wm8350, WM8350_IRQ_CHG_TO,
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wm8350_charger_handler, 0,
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"Charger timeout", wm8350);
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wm8350_register_irq(wm8350, WM8350_IRQ_CHG_END,
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wm8350_charger_handler, 0,
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"Charge end", wm8350);
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wm8350_register_irq(wm8350, WM8350_IRQ_CHG_START,
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wm8350_charger_handler, 0,
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"Charge start", wm8350);
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wm8350_register_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY,
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wm8350_charger_handler, 0,
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"Fast charge ready", wm8350);
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wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9,
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wm8350_charger_handler, 0,
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"Battery <3.9V", wm8350);
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wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1,
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wm8350_charger_handler, 0,
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"Battery <3.1V", wm8350);
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wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85,
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wm8350_charger_handler, 0,
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"Battery <2.85V", wm8350);
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/* and supply change events */
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wm8350_register_irq(wm8350, WM8350_IRQ_EXT_USB_FB,
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wm8350_charger_handler, 0, "USB", wm8350);
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wm8350_register_irq(wm8350, WM8350_IRQ_EXT_WALL_FB,
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wm8350_charger_handler, 0, "Wall", wm8350);
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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");
|