[PATCH 5.10 092/147] power: supply: wm97xx_battery: Convert to GPIO descriptor

Sasha Levin
2026-02-28T18:18:50Z

From: Linus Walleij <linus.walleij@linaro.org>

[ Upstream commit cb6d6918c56ffd98e88164d5471f692d33dabf2b ]

This converts the WM97xx driver to use a GPIO descriptor
instead of passing a GPIO number thru platform data.

Like everything else in the driver, use a simple local
variable for the descriptor, it can only ever appear in
one instance anyway so it should not hurt.

After converting the driver I noticed that none of the
boardfiles actually define a meaningful GPIO line for
this, but hey, it is converted.

Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Stable-dep-of: 39fe0eac6d75 ("power: supply: wm97xx: Fix NULL pointer dereference in power_supply_changed()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/arm/mach-pxa/mioa701.c | 1 -
arch/arm/mach-pxa/palm27x.c | 1 -
arch/arm/mach-pxa/palmte2.c | 1 -
drivers/power/supply/wm97xx_battery.c | 45 +++++++++++----------------
include/linux/wm97xx.h | 1 -
5 files changed, 19 insertions(+), 30 deletions(-)

diff --git a/arch/arm/mach-pxa/mioa701.c b/arch/arm/mach-pxa/mioa701.c
index d3af80317f2da..a79f296e81e02 100644
--- a/arch/arm/mach-pxa/mioa701.c
+++ b/arch/arm/mach-pxa/mioa701.c
@@ -577,7 +577,6 @@ static struct platform_device power_dev = {
static struct wm97xx_batt_pdata mioa701_battery_data = {
.batt_aux = WM97XX_AUX_ID1,
.temp_aux = -1,
- .charge_gpio = -1,
.min_voltage = 0xc00,
.max_voltage = 0xfc0,
.batt_tech = POWER_SUPPLY_TECHNOLOGY_LION,
diff --git a/arch/arm/mach-pxa/palm27x.c b/arch/arm/mach-pxa/palm27x.c
index 0d246a1aebbcd..6230381a7ca0c 100644
--- a/arch/arm/mach-pxa/palm27x.c
+++ b/arch/arm/mach-pxa/palm27x.c
@@ -212,7 +212,6 @@ void __init palm27x_irda_init(int pwdn)
static struct wm97xx_batt_pdata palm27x_batt_pdata = {
.batt_aux = WM97XX_AUX_ID3,
.temp_aux = WM97XX_AUX_ID2,
- .charge_gpio = -1,
.batt_mult = 1000,
.batt_div = 414,
.temp_mult = 1,
diff --git a/arch/arm/mach-pxa/palmte2.c b/arch/arm/mach-pxa/palmte2.c
index e3bcf58b4e639..a2b10db4aacc4 100644
--- a/arch/arm/mach-pxa/palmte2.c
+++ b/arch/arm/mach-pxa/palmte2.c
@@ -273,7 +273,6 @@ static struct platform_device power_supply = {
static struct wm97xx_batt_pdata palmte2_batt_pdata = {
.batt_aux = WM97XX_AUX_ID3,
.temp_aux = WM97XX_AUX_ID2,
- .charge_gpio = -1,
.max_voltage = PALMTE2_BAT_MAX_VOLTAGE,
.min_voltage = PALMTE2_BAT_MIN_VOLTAGE,
.batt_mult = 1000,
diff --git a/drivers/power/supply/wm97xx_battery.c b/drivers/power/supply/wm97xx_battery.c
index 58f01659daa5f..a0e1eaa25d93e 100644
--- a/drivers/power/supply/wm97xx_battery.c
+++ b/drivers/power/supply/wm97xx_battery.c
@@ -15,11 +15,12 @@
#include <linux/wm97xx.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/irq.h>
#include <linux/slab.h>

static struct work_struct bat_work;
+static struct gpio_desc *charge_gpiod;
static DEFINE_MUTEX(work_lock);
static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
static enum power_supply_property *prop;
@@ -96,12 +97,11 @@ static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
static void wm97xx_bat_update(struct power_supply *bat_ps)
{
int old_status = bat_status;
- struct wm97xx_batt_pdata *pdata = power_supply_get_drvdata(bat_ps);

mutex_lock(&work_lock);

- bat_status = (pdata->charge_gpio >= 0) ?
- (gpio_get_value(pdata->charge_gpio) ?
+ bat_status = (charge_gpiod) ?
+ (gpiod_get_value(charge_gpiod) ?
POWER_SUPPLY_STATUS_DISCHARGING :
POWER_SUPPLY_STATUS_CHARGING) :
POWER_SUPPLY_STATUS_UNKNOWN;
@@ -171,18 +171,19 @@ static int wm97xx_bat_probe(struct platform_device *dev)
if (dev->id != -1)
return -EINVAL;

- if (gpio_is_valid(pdata->charge_gpio)) {
- ret = gpio_request(pdata->charge_gpio, "BATT CHRG");
- if (ret)
- goto err;
- ret = gpio_direction_input(pdata->charge_gpio);
- if (ret)
- goto err2;
- ret = request_irq(gpio_to_irq(pdata->charge_gpio),
+ charge_gpiod = devm_gpiod_get_optional(&dev->dev, NULL, GPIOD_IN);
+ if (IS_ERR(charge_gpiod))
+ return dev_err_probe(&dev->dev,
+ PTR_ERR(charge_gpiod),
+ "failed to get charge GPIO\n");
+ if (charge_gpiod) {
+ gpiod_set_consumer_name(charge_gpiod, "BATT CHRG");
+ ret = request_irq(gpiod_to_irq(charge_gpiod),
wm97xx_chrg_irq, 0,
"AC Detect", dev);
if (ret)
- goto err2;
+ return dev_err_probe(&dev->dev, ret,
+ "failed to request GPIO irq\n");
props++; /* POWER_SUPPLY_PROP_STATUS */
}

@@ -204,7 +205,7 @@ static int wm97xx_bat_probe(struct platform_device *dev)
}

prop[i++] = POWER_SUPPLY_PROP_PRESENT;
- if (pdata->charge_gpio >= 0)
+ if (charge_gpiod)
prop[i++] = POWER_SUPPLY_PROP_STATUS;
if (pdata->batt_tech >= 0)
prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
@@ -242,23 +243,15 @@ static int wm97xx_bat_probe(struct platform_device *dev)
err4:
kfree(prop);
err3:
- if (gpio_is_valid(pdata->charge_gpio))
- free_irq(gpio_to_irq(pdata->charge_gpio), dev);
-err2:
- if (gpio_is_valid(pdata->charge_gpio))
- gpio_free(pdata->charge_gpio);
-err:
+ if (charge_gpiod)
+ free_irq(gpiod_to_irq(charge_gpiod), dev);
return ret;
}

static int wm97xx_bat_remove(struct platform_device *dev)
{
- struct wm97xx_batt_pdata *pdata = dev->dev.platform_data;
-
- if (pdata && gpio_is_valid(pdata->charge_gpio)) {
- free_irq(gpio_to_irq(pdata->charge_gpio), dev);
- gpio_free(pdata->charge_gpio);
- }
+ if (charge_gpiod)
+ free_irq(gpiod_to_irq(charge_gpiod), dev);
cancel_work_sync(&bat_work);
power_supply_unregister(bat_psy);
kfree(prop);
diff --git a/include/linux/wm97xx.h b/include/linux/wm97xx.h
index 58e082dadc683..462854f4f286c 100644
--- a/include/linux/wm97xx.h
+++ b/include/linux/wm97xx.h
@@ -294,7 +294,6 @@ struct wm97xx {
struct wm97xx_batt_pdata {
int batt_aux;
int temp_aux;
- int charge_gpio;
int min_voltage;
int max_voltage;
int batt_div;
--
2.51.0