Re: [PATCH 40/48] ARM: pxa: tosa: use gpio lookup for battery

[Sebastian Reichel <sre@kernel.org>]

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Hi,

On Tue, Apr 19, 2022 at 06:38:02PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.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@kernel.org>
> Acked-by: Sebastian Reichel <sre@kernel.org>
> Cc: linux-pm@vger.kernel.org
> Signed-off-by: Arnd Bergmann <arnd@arndb.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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