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linux/drivers/power/supply/wm8350_power.c
Uwe Kleine-König 42720969f3 power: supply: wm8350_power: Convert to platform remove callback returning void 
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new() which already returns void. Eventually after all drivers
are converted, .remove_new() is renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230918133700.1254499-32-u.kleine-koenig@pengutronix.de
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
2023-09-18 20:08:04 +02:00

607 lines
16 KiB
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Battery driver for wm8350 PMIC
*
* Copyright 2007, 2008 Wolfson Microelectronics PLC.
*
* Based on OLPC Battery Driver
*
* Copyright 2006 David Woodhouse <dwmw2@infradead.org>
*/
#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 sysfs_emit(buf, "%s\n", charge);
}
static DEVICE_ATTR_RO(charger_state);
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);
fallthrough;
case WM8350_IRQ_EXT_BAT_FB:
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 int wm8350_init_charger(struct wm8350 *wm8350)
{
int ret;
/* register our interest in charger events */
ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT,
wm8350_charger_handler, 0, "Battery hot", wm8350);
if (ret)
goto err;
ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD,
wm8350_charger_handler, 0, "Battery cold", wm8350);
if (ret)
goto free_chg_bat_hot;
ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL,
wm8350_charger_handler, 0, "Battery fail", wm8350);
if (ret)
goto free_chg_bat_cold;
ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_TO,
wm8350_charger_handler, 0,
"Charger timeout", wm8350);
if (ret)
goto free_chg_bat_fail;
ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_END,
wm8350_charger_handler, 0,
"Charge end", wm8350);
if (ret)
goto free_chg_to;
ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_START,
wm8350_charger_handler, 0,
"Charge start", wm8350);
if (ret)
goto free_chg_end;
ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY,
wm8350_charger_handler, 0,
"Fast charge ready", wm8350);
if (ret)
goto free_chg_start;
ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9,
wm8350_charger_handler, 0,
"Battery <3.9V", wm8350);
if (ret)
goto free_chg_fast_rdy;
ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1,
wm8350_charger_handler, 0,
"Battery <3.1V", wm8350);
if (ret)
goto free_chg_vbatt_lt_3p9;
ret = wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85,
wm8350_charger_handler, 0,
"Battery <2.85V", wm8350);
if (ret)
goto free_chg_vbatt_lt_3p1;
/* and supply change events */
ret = wm8350_register_irq(wm8350, WM8350_IRQ_EXT_USB_FB,
wm8350_charger_handler, 0, "USB", wm8350);
if (ret)
goto free_chg_vbatt_lt_2p85;
ret = wm8350_register_irq(wm8350, WM8350_IRQ_EXT_WALL_FB,
wm8350_charger_handler, 0, "Wall", wm8350);
if (ret)
goto free_ext_usb_fb;
ret = wm8350_register_irq(wm8350, WM8350_IRQ_EXT_BAT_FB,
wm8350_charger_handler, 0, "Battery", wm8350);
if (ret)
goto free_ext_wall_fb;
return 0;
free_ext_wall_fb:
wm8350_free_irq(wm8350, WM8350_IRQ_EXT_WALL_FB, wm8350);
free_ext_usb_fb:
wm8350_free_irq(wm8350, WM8350_IRQ_EXT_USB_FB, wm8350);
free_chg_vbatt_lt_2p85:
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85, wm8350);
free_chg_vbatt_lt_3p1:
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1, wm8350);
free_chg_vbatt_lt_3p9:
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9, wm8350);
free_chg_fast_rdy:
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY, wm8350);
free_chg_start:
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_START, wm8350);
free_chg_end:
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_END, wm8350);
free_chg_to:
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_TO, wm8350);
free_chg_bat_fail:
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL, wm8350);
free_chg_bat_cold:
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD, wm8350);
free_chg_bat_hot:
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT, wm8350);
err:
return ret;
}
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_FAST_RDY, 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 void 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);
}
static struct platform_driver wm8350_power_driver = {
.probe = wm8350_power_probe,
.remove_new = 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");
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