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Message-ID: <20220420134305.fq7pc3fsz5fxkryj@mercury.elektranox.org>
Date: Wed, 20 Apr 2022 15:43:05 +0200
From: Sebastian Reichel <sre@...nel.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: robert.jarzmik@...e.fr, linux-arm-kernel@...ts.infradead.org,
Arnd Bergmann <arnd@...db.de>, Daniel Mack <daniel@...que.org>,
Haojian Zhuang <haojian.zhuang@...il.com>,
Marek Vasut <marek.vasut@...il.com>,
Philipp Zabel <philipp.zabel@...il.com>,
Lubomir Rintel <lkundrak@...sk>,
Paul Parsons <lost.distance@...oo.com>,
Tomas Cech <sleep_walker@...e.com>,
Sergey Lapin <slapin@...fans.org>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Viresh Kumar <viresh.kumar@...aro.org>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Ulf Hansson <ulf.hansson@...aro.org>,
Dominik Brodowski <linux@...inikbrodowski.net>,
Helge Deller <deller@....de>, Mark Brown <broonie@...nel.org>,
Linus Walleij <linus.walleij@...aro.org>,
linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
linux-ide@...r.kernel.org, linux-clk@...r.kernel.org,
linux-pm@...r.kernel.org, linux-input@...r.kernel.org,
patches@...nsource.cirrus.com, linux-leds@...r.kernel.org,
linux-mmc@...r.kernel.org, linux-mtd@...ts.infradead.org,
linux-rtc@...r.kernel.org, linux-usb@...r.kernel.org,
linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
alsa-devel@...a-project.org
Subject: Re: [PATCH 40/48] ARM: pxa: tosa: use gpio lookup for battery
Hi,
On Tue, Apr 19, 2022 at 06:38:02PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
>
> The battery driver uses a lot of GPIO lines, hardcoded from a
> machine header file.
>
> Change it to use a gpiod lookup table instead.
>
> Reviewed-by: Sebastian Reichel <sre@...nel.org>
> Acked-by: Sebastian Reichel <sre@...nel.org>
> Cc: linux-pm@...r.kernel.org
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
That's the last power-supply driver not yet using descriptor based
gpio API :)
> [...]
> diff --git a/drivers/power/supply/tosa_battery.c b/drivers/power/supply/tosa_battery.c
> index b26b0eca33e1..d10320f348d0 100644
> --- a/drivers/power/supply/tosa_battery.c
> +++ b/drivers/power/supply/tosa_battery.c
> @@ -15,11 +15,16 @@
> #include <linux/gpio.h>
This should be <linux/gpio/consumer.h> now.
-- Sebastian
>
> #include <asm/mach-types.h>
> -#include <mach/tosa.h>
>
> static DEFINE_MUTEX(bat_lock); /* protects gpio pins */
> static struct work_struct bat_work;
>
> +struct tosa_gpio {
> + const char *con;
> + enum gpiod_flags flags;
> + struct gpio_desc *desc;
> +};
> +
> struct tosa_bat {
> int status;
> struct power_supply *psy;
> @@ -28,38 +33,42 @@ struct tosa_bat {
> struct mutex work_lock; /* protects data */
>
> bool (*is_present)(struct tosa_bat *bat);
> - int gpio_full;
> - int gpio_charge_off;
> + struct tosa_gpio gpio_full;
> + struct tosa_gpio gpio_charge_off;
>
> int technology;
>
> - int gpio_bat;
> + struct tosa_gpio gpio_bat;
> int adc_bat;
> int adc_bat_divider;
> int bat_max;
> int bat_min;
>
> - int gpio_temp;
> + struct tosa_gpio gpio_temp;
> int adc_temp;
> int adc_temp_divider;
> };
>
> static struct tosa_bat tosa_bat_main;
> static struct tosa_bat tosa_bat_jacket;
> +static struct tosa_gpio gpiod_jacket_det = { "jacket detect", GPIOD_IN };
> +static struct tosa_gpio gpiod_battery_switch = { "battery switch", GPIOD_OUT_LOW };
> +static struct tosa_gpio gpiod_main_battery_low = { "main battery low", GPIOD_IN };
> +static struct tosa_gpio gpiod_jacket_battery_low = { "jacket battery low", GPIOD_IN };
>
> static unsigned long tosa_read_bat(struct tosa_bat *bat)
> {
> unsigned long value = 0;
>
> - if (bat->gpio_bat < 0 || bat->adc_bat < 0)
> + if (!bat->gpio_bat.desc || bat->adc_bat < 0)
> return 0;
>
> mutex_lock(&bat_lock);
> - gpio_set_value(bat->gpio_bat, 1);
> + gpiod_set_value(bat->gpio_bat.desc, 1);
> msleep(5);
> value = wm97xx_read_aux_adc(dev_get_drvdata(bat->psy->dev.parent),
> bat->adc_bat);
> - gpio_set_value(bat->gpio_bat, 0);
> + gpiod_set_value(bat->gpio_bat.desc, 0);
> mutex_unlock(&bat_lock);
>
> value = value * 1000000 / bat->adc_bat_divider;
> @@ -71,15 +80,15 @@ static unsigned long tosa_read_temp(struct tosa_bat *bat)
> {
> unsigned long value = 0;
>
> - if (bat->gpio_temp < 0 || bat->adc_temp < 0)
> + if (!bat->gpio_temp.desc || bat->adc_temp < 0)
> return 0;
>
> mutex_lock(&bat_lock);
> - gpio_set_value(bat->gpio_temp, 1);
> + gpiod_set_value(bat->gpio_temp.desc, 1);
> msleep(5);
> value = wm97xx_read_aux_adc(dev_get_drvdata(bat->psy->dev.parent),
> bat->adc_temp);
> - gpio_set_value(bat->gpio_temp, 0);
> + gpiod_set_value(bat->gpio_temp.desc, 0);
> mutex_unlock(&bat_lock);
>
> value = value * 10000 / bat->adc_temp_divider;
> @@ -136,7 +145,7 @@ static int tosa_bat_get_property(struct power_supply *psy,
>
> static bool tosa_jacket_bat_is_present(struct tosa_bat *bat)
> {
> - return gpio_get_value(TOSA_GPIO_JACKET_DETECT) == 0;
> + return gpiod_get_value(gpiod_jacket_det.desc) == 0;
> }
>
> static void tosa_bat_external_power_changed(struct power_supply *psy)
> @@ -166,23 +175,23 @@ static void tosa_bat_update(struct tosa_bat *bat)
> bat->full_chrg = -1;
> } else if (power_supply_am_i_supplied(psy)) {
> if (bat->status == POWER_SUPPLY_STATUS_DISCHARGING) {
> - gpio_set_value(bat->gpio_charge_off, 0);
> + gpiod_set_value(bat->gpio_charge_off.desc, 0);
> mdelay(15);
> }
>
> - if (gpio_get_value(bat->gpio_full)) {
> + if (gpiod_get_value(bat->gpio_full.desc)) {
> if (old == POWER_SUPPLY_STATUS_CHARGING ||
> bat->full_chrg == -1)
> bat->full_chrg = tosa_read_bat(bat);
>
> - gpio_set_value(bat->gpio_charge_off, 1);
> + gpiod_set_value(bat->gpio_charge_off.desc, 1);
> bat->status = POWER_SUPPLY_STATUS_FULL;
> } else {
> - gpio_set_value(bat->gpio_charge_off, 0);
> + gpiod_set_value(bat->gpio_charge_off.desc, 0);
> bat->status = POWER_SUPPLY_STATUS_CHARGING;
> }
> } else {
> - gpio_set_value(bat->gpio_charge_off, 1);
> + gpiod_set_value(bat->gpio_charge_off.desc, 1);
> bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
> }
>
> @@ -251,18 +260,18 @@ static struct tosa_bat tosa_bat_main = {
> .full_chrg = -1,
> .psy = NULL,
>
> - .gpio_full = TOSA_GPIO_BAT0_CRG,
> - .gpio_charge_off = TOSA_GPIO_CHARGE_OFF,
> + .gpio_full = { "main battery full", GPIOD_IN },
> + .gpio_charge_off = { "main charge off" , GPIOD_OUT_HIGH },
>
> .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
>
> - .gpio_bat = TOSA_GPIO_BAT0_V_ON,
> + .gpio_bat = { "main battery", GPIOD_OUT_LOW },
> .adc_bat = WM97XX_AUX_ID3,
> .adc_bat_divider = 414,
> .bat_max = 4310000,
> .bat_min = 1551 * 1000000 / 414,
>
> - .gpio_temp = TOSA_GPIO_BAT1_TH_ON,
> + .gpio_temp = { "main battery temp", GPIOD_OUT_LOW },
> .adc_temp = WM97XX_AUX_ID2,
> .adc_temp_divider = 10000,
> };
> @@ -273,18 +282,18 @@ static struct tosa_bat tosa_bat_jacket = {
> .psy = NULL,
>
> .is_present = tosa_jacket_bat_is_present,
> - .gpio_full = TOSA_GPIO_BAT1_CRG,
> - .gpio_charge_off = TOSA_GPIO_CHARGE_OFF_JC,
> + .gpio_full = { "jacket battery full", GPIOD_IN },
> + .gpio_charge_off = { "jacket charge off", GPIOD_OUT_HIGH },
>
> .technology = POWER_SUPPLY_TECHNOLOGY_LIPO,
>
> - .gpio_bat = TOSA_GPIO_BAT1_V_ON,
> + .gpio_bat = { "jacket battery", GPIOD_OUT_LOW },
> .adc_bat = WM97XX_AUX_ID3,
> .adc_bat_divider = 414,
> .bat_max = 4310000,
> .bat_min = 1551 * 1000000 / 414,
>
> - .gpio_temp = TOSA_GPIO_BAT0_TH_ON,
> + .gpio_temp = { "jacket battery temp", GPIOD_OUT_LOW },
> .adc_temp = WM97XX_AUX_ID2,
> .adc_temp_divider = 10000,
> };
> @@ -294,36 +303,16 @@ static struct tosa_bat tosa_bat_bu = {
> .full_chrg = -1,
> .psy = NULL,
>
> - .gpio_full = -1,
> - .gpio_charge_off = -1,
> -
> .technology = POWER_SUPPLY_TECHNOLOGY_LiMn,
>
> - .gpio_bat = TOSA_GPIO_BU_CHRG_ON,
> + .gpio_bat = { "backup battery", GPIOD_OUT_LOW },
> .adc_bat = WM97XX_AUX_ID4,
> .adc_bat_divider = 1266,
>
> - .gpio_temp = -1,
> .adc_temp = -1,
> .adc_temp_divider = -1,
> };
>
> -static struct gpio tosa_bat_gpios[] = {
> - { TOSA_GPIO_CHARGE_OFF, GPIOF_OUT_INIT_HIGH, "main charge off" },
> - { TOSA_GPIO_CHARGE_OFF_JC, GPIOF_OUT_INIT_HIGH, "jacket charge off" },
> - { TOSA_GPIO_BAT_SW_ON, GPIOF_OUT_INIT_LOW, "battery switch" },
> - { TOSA_GPIO_BAT0_V_ON, GPIOF_OUT_INIT_LOW, "main battery" },
> - { TOSA_GPIO_BAT1_V_ON, GPIOF_OUT_INIT_LOW, "jacket battery" },
> - { TOSA_GPIO_BAT1_TH_ON, GPIOF_OUT_INIT_LOW, "main battery temp" },
> - { TOSA_GPIO_BAT0_TH_ON, GPIOF_OUT_INIT_LOW, "jacket battery temp" },
> - { TOSA_GPIO_BU_CHRG_ON, GPIOF_OUT_INIT_LOW, "backup battery" },
> - { TOSA_GPIO_BAT0_CRG, GPIOF_IN, "main battery full" },
> - { TOSA_GPIO_BAT1_CRG, GPIOF_IN, "jacket battery full" },
> - { TOSA_GPIO_BAT0_LOW, GPIOF_IN, "main battery low" },
> - { TOSA_GPIO_BAT1_LOW, GPIOF_IN, "jacket battery low" },
> - { TOSA_GPIO_JACKET_DETECT, GPIOF_IN, "jacket detect" },
> -};
> -
> #ifdef CONFIG_PM
> static int tosa_bat_suspend(struct platform_device *dev, pm_message_t state)
> {
> @@ -343,6 +332,21 @@ static int tosa_bat_resume(struct platform_device *dev)
> #define tosa_bat_resume NULL
> #endif
>
> +static int tosa_bat_gpio_get(struct device *dev, struct tosa_gpio *gpio)
> +{
> + int ret;
> +
> + if (!gpio->con)
> + return 0;
> +
> + gpio->desc = devm_gpiod_get(dev, gpio->con, gpio->flags);
> + ret = PTR_ERR_OR_ZERO(gpio->desc);
> + if (ret)
> + dev_warn(dev, "failed to get gpio \"%s\"\n", gpio->con);
> +
> + return ret;
> +}
> +
> static int tosa_power_supply_register(struct device *dev,
> struct tosa_bat *bat,
> const struct power_supply_desc *desc)
> @@ -350,6 +354,23 @@ static int tosa_power_supply_register(struct device *dev,
> struct power_supply_config cfg = {
> .drv_data = bat,
> };
> + int ret;
> +
> + ret = tosa_bat_gpio_get(dev, &bat->gpio_full);
> + if (ret)
> + return ret;
> +
> + ret = tosa_bat_gpio_get(dev, &bat->gpio_charge_off);
> + if (ret)
> + return ret;
> +
> + ret = tosa_bat_gpio_get(dev, &bat->gpio_bat);
> + if (ret)
> + return ret;
> +
> + ret = tosa_bat_gpio_get(dev, &bat->gpio_temp);
> + if (ret)
> + return ret;
>
> mutex_init(&bat->work_lock);
> bat->psy = power_supply_register(dev, desc, &cfg);
> @@ -358,49 +379,55 @@ static int tosa_power_supply_register(struct device *dev,
> }
>
>
> -static int tosa_bat_probe(struct platform_device *dev)
> +static int tosa_bat_probe(struct platform_device *pdev)
> {
> + struct device *dev = &pdev->dev;
> int ret;
>
> if (!machine_is_tosa())
> return -ENODEV;
>
> - ret = gpio_request_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
> + ret = tosa_bat_gpio_get(dev, &gpiod_jacket_det);
> if (ret)
> return ret;
>
> + /* these are not used anywhere, continue on failure */
> + tosa_bat_gpio_get(dev, &gpiod_battery_switch);
> + tosa_bat_gpio_get(dev, &gpiod_main_battery_low);
> + tosa_bat_gpio_get(dev, &gpiod_jacket_battery_low);
> +
> INIT_WORK(&bat_work, tosa_bat_work);
>
> - ret = tosa_power_supply_register(&dev->dev, &tosa_bat_main,
> + ret = tosa_power_supply_register(dev, &tosa_bat_main,
> &tosa_bat_main_desc);
> if (ret)
> goto err_psy_reg_main;
>
> - ret = tosa_power_supply_register(&dev->dev, &tosa_bat_jacket,
> + ret = tosa_power_supply_register(dev, &tosa_bat_jacket,
> &tosa_bat_jacket_desc);
> if (ret)
> goto err_psy_reg_jacket;
>
> - ret = tosa_power_supply_register(&dev->dev, &tosa_bat_bu,
> + ret = tosa_power_supply_register(dev, &tosa_bat_bu,
> &tosa_bat_bu_desc);
> if (ret)
> goto err_psy_reg_bu;
>
> - ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG),
> + ret = request_irq(gpiod_to_irq(tosa_bat_main.gpio_full.desc),
> tosa_bat_gpio_isr,
> IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
> "main full", &tosa_bat_main);
> if (ret)
> goto err_req_main;
>
> - ret = request_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG),
> + ret = request_irq(gpiod_to_irq(tosa_bat_jacket.gpio_full.desc),
> tosa_bat_gpio_isr,
> IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
> "jacket full", &tosa_bat_jacket);
> if (ret)
> goto err_req_jacket;
>
> - ret = request_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT),
> + ret = request_irq(gpiod_to_irq(gpiod_jacket_det.desc),
> tosa_bat_gpio_isr,
> IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
> "jacket detect", &tosa_bat_jacket);
> @@ -409,9 +436,9 @@ static int tosa_bat_probe(struct platform_device *dev)
> return 0;
> }
>
> - free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
> + free_irq(gpiod_to_irq(tosa_bat_jacket.gpio_full.desc), &tosa_bat_jacket);
> err_req_jacket:
> - free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
> + free_irq(gpiod_to_irq(tosa_bat_main.gpio_full.desc), &tosa_bat_main);
> err_req_main:
> power_supply_unregister(tosa_bat_bu.psy);
> err_psy_reg_bu:
> @@ -423,15 +450,14 @@ static int tosa_bat_probe(struct platform_device *dev)
> /* see comment in tosa_bat_remove */
> cancel_work_sync(&bat_work);
>
> - gpio_free_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
> return ret;
> }
>
> static int tosa_bat_remove(struct platform_device *dev)
> {
> - free_irq(gpio_to_irq(TOSA_GPIO_JACKET_DETECT), &tosa_bat_jacket);
> - free_irq(gpio_to_irq(TOSA_GPIO_BAT1_CRG), &tosa_bat_jacket);
> - free_irq(gpio_to_irq(TOSA_GPIO_BAT0_CRG), &tosa_bat_main);
> + free_irq(gpiod_to_irq(gpiod_jacket_det.desc), &tosa_bat_jacket);
> + free_irq(gpiod_to_irq(tosa_bat_jacket.gpio_full.desc), &tosa_bat_jacket);
> + free_irq(gpiod_to_irq(tosa_bat_main.gpio_full.desc), &tosa_bat_main);
>
> power_supply_unregister(tosa_bat_bu.psy);
> power_supply_unregister(tosa_bat_jacket.psy);
> @@ -443,7 +469,6 @@ static int tosa_bat_remove(struct platform_device *dev)
> * unregistered now.
> */
> cancel_work_sync(&bat_work);
> - gpio_free_array(tosa_bat_gpios, ARRAY_SIZE(tosa_bat_gpios));
> return 0;
> }
>
> --
> 2.29.2
>
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