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538 lines
15 KiB
538 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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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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fallthrough; |
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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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|
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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, |
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wm8350_charger_handler, 0, "Battery", wm8350); |
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} |
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static void free_charger_irq(struct wm8350 *wm8350) |
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{ |
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wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT, wm8350); |
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wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD, wm8350); |
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wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL, wm8350); |
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wm8350_free_irq(wm8350, WM8350_IRQ_CHG_TO, wm8350); |
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wm8350_free_irq(wm8350, WM8350_IRQ_CHG_END, wm8350); |
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wm8350_free_irq(wm8350, WM8350_IRQ_CHG_START, wm8350); |
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wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9, wm8350); |
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wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1, wm8350); |
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wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85, wm8350); |
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wm8350_free_irq(wm8350, WM8350_IRQ_EXT_USB_FB, wm8350); |
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wm8350_free_irq(wm8350, WM8350_IRQ_EXT_WALL_FB, wm8350); |
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wm8350_free_irq(wm8350, WM8350_IRQ_EXT_BAT_FB, wm8350); |
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} |
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static int wm8350_power_probe(struct platform_device *pdev) |
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{ |
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struct wm8350 *wm8350 = platform_get_drvdata(pdev); |
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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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int ret; |
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power->ac = power_supply_register(&pdev->dev, &wm8350_ac_desc, NULL); |
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if (IS_ERR(power->ac)) |
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return PTR_ERR(power->ac); |
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power->battery = power_supply_register(&pdev->dev, &wm8350_battery_desc, |
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NULL); |
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if (IS_ERR(power->battery)) { |
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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");
|
|
|