Re: [PATCH 40/46] ARM: pxa: tosa: use gpio lookup for battery

From: Sebastian Reichel
Date: Sat Oct 19 2019 - 05:09:50 EST

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In reply to: Arnd Bergmann: "[PATCH 40/46] ARM: pxa: tosa: use gpio lookup for battery"
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Hi,

On Fri, Oct 18, 2019 at 05:41:55PM +0200, Arnd Bergmann wrote:
> The battery driver uses a lot of GPIO lines, hardcoded from a
> machine header file.
>
> Change it to use a gpiod lookup table instead.
>
> Cc: Sebastian Reichel <sre@xxxxxxxxxx>
> Cc: linux-pm@xxxxxxxxxxxxxxx
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---

That's a nice cleanup patch :) I assume, that this is also
merged together with the whole series through ARM, so:

Reviewed-by: Sebastian Reichel <sre@xxxxxxxxxx>
Acked-by: Sebastian Reichel <sre@xxxxxxxxxx>

-- Sebastian

> arch/arm/mach-pxa/tosa.c | 23 +++++
> drivers/power/supply/tosa_battery.c | 147 ++++++++++++++++------------
> 2 files changed, 109 insertions(+), 61 deletions(-)
>
> diff --git a/arch/arm/mach-pxa/tosa.c b/arch/arm/mach-pxa/tosa.c
> index 8329a2969b2b..ef3bbf6d158e 100644
> --- a/arch/arm/mach-pxa/tosa.c
> +++ b/arch/arm/mach-pxa/tosa.c
> @@ -365,6 +365,28 @@ static struct pxaficp_platform_data tosa_ficp_platform_data = {
> .shutdown = tosa_irda_shutdown,
> };
>
> +static struct gpiod_lookup_table tosa_battery_gpio_table = {
> + .dev_id = "wm97xx-battery",
> + .table = {
> + GPIO_LOOKUP("tc6393xb", TOSA_GPIO_CHARGE_OFF - TOSA_TC6393XB_GPIO_BASE, "main charge off", GPIO_ACTIVE_HIGH ),
> + GPIO_LOOKUP("tc6393xb", TOSA_GPIO_CHARGE_OFF_JC - TOSA_TC6393XB_GPIO_BASE, "jacket charge off", GPIO_ACTIVE_HIGH ),
> + GPIO_LOOKUP("tc6393xb", TOSA_GPIO_BAT_SW_ON - TOSA_TC6393XB_GPIO_BASE, "battery switch", GPIO_ACTIVE_HIGH ),
> + GPIO_LOOKUP("tc6393xb", TOSA_GPIO_BAT0_V_ON - TOSA_TC6393XB_GPIO_BASE, "main battery", GPIO_ACTIVE_HIGH ),
> + GPIO_LOOKUP("tc6393xb", TOSA_GPIO_BAT1_V_ON - TOSA_TC6393XB_GPIO_BASE, "jacket battery", GPIO_ACTIVE_HIGH ),
> + GPIO_LOOKUP("tc6393xb", TOSA_GPIO_BAT1_TH_ON - TOSA_TC6393XB_GPIO_BASE, "main battery temp", GPIO_ACTIVE_HIGH ),
> + GPIO_LOOKUP("tc6393xb", TOSA_GPIO_BAT0_TH_ON - TOSA_TC6393XB_GPIO_BASE, "jacket battery temp", GPIO_ACTIVE_HIGH ),
> + GPIO_LOOKUP("tc6393xb", TOSA_GPIO_BU_CHRG_ON - TOSA_TC6393XB_GPIO_BASE, "backup battery", GPIO_ACTIVE_HIGH ),
> +
> + GPIO_LOOKUP("gpio-pxa", TOSA_GPIO_BAT0_CRG, "main battery full", GPIO_ACTIVE_HIGH ),
> + GPIO_LOOKUP("gpio-pxa", TOSA_GPIO_BAT1_CRG, "jacket battery full", GPIO_ACTIVE_HIGH ),
> + GPIO_LOOKUP("gpio-pxa", TOSA_GPIO_BAT0_LOW, "main battery low", GPIO_ACTIVE_HIGH ),
> + GPIO_LOOKUP("gpio-pxa", TOSA_GPIO_BAT1_LOW, "jacket battery low", GPIO_ACTIVE_HIGH ),
> + GPIO_LOOKUP("gpio-pxa", TOSA_GPIO_JACKET_DETECT, "jacket detect", GPIO_ACTIVE_HIGH ),
> + { },
> + },
> +};
> +
> +
> /*
> * Tosa AC IN
> */
> @@ -946,6 +968,7 @@ static void __init tosa_init(void)
> /* enable batt_fault */
> PMCR = 0x01;
>
> + gpiod_add_lookup_table(&tosa_battery_gpio_table);
> gpiod_add_lookup_table(&tosa_mci_gpio_table);
> gpiod_add_lookup_table(&tosa_audio_gpio_table);
> pxa_set_mci_info(&tosa_mci_platform_data);
> 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>
>
> #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;
> }
>
> --
> 2.20.0
>

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