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Date: Sun, 5 Jan 2020 18:24:42 +0800
From: Chen-Yu Tsai <wens@...e.org>
To: Samuel Holland <samuel@...lland.org>
Cc: Sebastian Reichel <sre@...nel.org>,
Lee Jones <lee.jones@...aro.org>,
Hans de Goede <hdegoede@...hat.com>,
Oskari Lemmela <oskari@...mela.net>,
"open list:THERMAL" <linux-pm@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH v2 4/9] power: supply: axp20x_ac_power: Add
wakeup control
On Sun, Jan 5, 2020 at 9:24 AM Samuel Holland <samuel@...lland.org> wrote:
>
> The AC power supply input can be used as a wakeup source. Hook up the
> ACIN_PLUGIN IRQ to trigger wakeup based on userspace configuration.
>
> To do this, we must remember the list of IRQs for the life of the
> device. To know how much space to allocate for the flexible array
> member, we switch from using a NULL sentinel to using an array length.
>
> Because we now depend on the specific order of the IRQs (we assume
> ACIN_PLUGIN is first and always present), failing to acquire an IRQ
> during probe must be a fatal error.
>
> To avoid spuriously waking up the system when the AC power supply is
> not configured as a wakeup source, we must explicitly disable all non-
> wake IRQs during system suspend. This is because the SoC's NMI input is
> shared among all IRQs on the AXP PMIC. Due to the use of regmap-irq, the
> individual IRQs within the PMIC are nested threaded interrupts, and are
> therefore not automatically disabled during system suspend.
>
> The upshot is that if any other device within the MFD (such as the power
> key) is an enabled wakeup source, all enabled IRQs within the PMIC will
> cause wakeup. We still need to call enable_irq_wake() when we *do* want
> wakeup, in case those other wakeup sources on the PMIC are all disabled.
>
> Signed-off-by: Samuel Holland <samuel@...lland.org>
> ---
> drivers/power/supply/axp20x_ac_power.c | 91 +++++++++++++++++++++-----
> 1 file changed, 74 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/power/supply/axp20x_ac_power.c b/drivers/power/supply/axp20x_ac_power.c
> index bc2663cd47fa..177b5c1eee8f 100644
> --- a/drivers/power/supply/axp20x_ac_power.c
> +++ b/drivers/power/supply/axp20x_ac_power.c
> @@ -15,6 +15,7 @@
> #include <linux/of.h>
> #include <linux/of_device.h>
> #include <linux/platform_device.h>
> +#include <linux/pm.h>
> #include <linux/power_supply.h>
> #include <linux/regmap.h>
> #include <linux/slab.h>
> @@ -44,6 +45,8 @@ struct axp20x_ac_power {
> struct iio_channel *acin_v;
> struct iio_channel *acin_i;
> bool has_acin_path_sel;
> + unsigned int num_irqs;
> + unsigned int irqs[];
> };
>
> static irqreturn_t axp20x_ac_power_irq(int irq, void *devid)
> @@ -242,38 +245,86 @@ static const struct power_supply_desc axp813_ac_power_desc = {
> .set_property = axp813_ac_power_set_property,
> };
>
> +static const char * const axp20x_irq_names[] = {
> + "ACIN_PLUGIN",
> + "ACIN_REMOVAL",
> +};
> +
> struct axp_data {
> const struct power_supply_desc *power_desc;
> + const char * const *irq_names;
> + unsigned int num_irq_names;
> bool acin_adc;
> bool acin_path_sel;
> };
>
> static const struct axp_data axp20x_data = {
> .power_desc = &axp20x_ac_power_desc,
> + .irq_names = axp20x_irq_names,
> + .num_irq_names = ARRAY_SIZE(axp20x_irq_names),
> .acin_adc = true,
> .acin_path_sel = false,
> };
>
> static const struct axp_data axp22x_data = {
> .power_desc = &axp22x_ac_power_desc,
> + .irq_names = axp20x_irq_names,
> + .num_irq_names = ARRAY_SIZE(axp20x_irq_names),
> .acin_adc = false,
> .acin_path_sel = false,
> };
>
> static const struct axp_data axp813_data = {
> .power_desc = &axp813_ac_power_desc,
> + .irq_names = axp20x_irq_names,
> + .num_irq_names = ARRAY_SIZE(axp20x_irq_names),
> .acin_adc = false,
> .acin_path_sel = true,
> };
>
> +#ifdef CONFIG_PM_SLEEP
> +static int axp20x_ac_power_suspend(struct device *dev)
> +{
> + struct axp20x_ac_power *power = dev_get_drvdata(dev);
> + int i = 0;
> +
> + /*
> + * Allow wake via ACIN_PLUGIN only.
> + *
> + * As nested threaded IRQs are not automatically disabled during
> + * suspend, we must explicitly disable the remainder of the IRQs.
> + */
> + if (device_may_wakeup(&power->supply->dev))
> + enable_irq_wake(power->irqs[i++]);
> + while (i < power->num_irqs)
> + disable_irq(power->irqs[i++]);
> +
> + return 0;
> +}
> +
> +static int axp20x_ac_power_resume(struct device *dev)
> +{
> + struct axp20x_ac_power *power = dev_get_drvdata(dev);
> + int i = 0;
> +
> + if (device_may_wakeup(&power->supply->dev))
> + disable_irq_wake(power->irqs[i++]);
> + while (i < power->num_irqs)
> + enable_irq(power->irqs[i++]);
> +
> + return 0;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(axp20x_ac_power_pm_ops, axp20x_ac_power_suspend,
> + axp20x_ac_power_resume);
> +
> static int axp20x_ac_power_probe(struct platform_device *pdev)
> {
> struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
> struct power_supply_config psy_cfg = {};
> struct axp20x_ac_power *power;
> const struct axp_data *axp_data;
> - static const char * const irq_names[] = { "ACIN_PLUGIN", "ACIN_REMOVAL",
> - NULL };
> int i, irq, ret;
>
> if (!of_device_is_available(pdev->dev.of_node))
> @@ -284,12 +335,14 @@ static int axp20x_ac_power_probe(struct platform_device *pdev)
> return -EINVAL;
> }
>
> - power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL);
> + axp_data = of_device_get_match_data(&pdev->dev);
> +
> + power = devm_kzalloc(&pdev->dev,
> + struct_size(power, irqs, axp_data->num_irq_names),
> + GFP_KERNEL);
> if (!power)
> return -ENOMEM;
>
> - axp_data = of_device_get_match_data(&pdev->dev);
> -
This change doesn't seem related, nor is it needed.
> if (axp_data->acin_adc) {
> power->acin_v = devm_iio_channel_get(&pdev->dev, "acin_v");
> if (IS_ERR(power->acin_v)) {
> @@ -308,6 +361,7 @@ static int axp20x_ac_power_probe(struct platform_device *pdev)
>
> power->regmap = dev_get_regmap(pdev->dev.parent, NULL);
> power->has_acin_path_sel = axp_data->acin_path_sel;
> + power->num_irqs = axp_data->num_irq_names;
>
> platform_set_drvdata(pdev, power);
>
> @@ -321,20 +375,22 @@ static int axp20x_ac_power_probe(struct platform_device *pdev)
> return PTR_ERR(power->supply);
>
> /* Request irqs after registering, as irqs may trigger immediately */
> - for (i = 0; irq_names[i]; i++) {
> - irq = platform_get_irq_byname(pdev, irq_names[i]);
> + for (i = 0; i < axp_data->num_irq_names; i++) {
> + irq = platform_get_irq_byname(pdev, axp_data->irq_names[i]);
> if (irq < 0) {
> - dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
> - irq_names[i], irq);
> - continue;
> + dev_err(&pdev->dev, "No IRQ for %s: %d\n",
> + axp_data->irq_names[i], irq);
> + return irq;
> }
> - irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
> - ret = devm_request_any_context_irq(&pdev->dev, irq,
> + power->irqs[i] = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
> + ret = devm_request_any_context_irq(&pdev->dev, power->irqs[i],
> axp20x_ac_power_irq, 0,
> DRVNAME, power);
> - if (ret < 0)
> - dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n",
> - irq_names[i], ret);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "Error requesting %s IRQ: %d\n",
> + axp_data->irq_names[i], ret);
> + return ret;
> + }
> }
>
> return 0;
> @@ -357,8 +413,9 @@ MODULE_DEVICE_TABLE(of, axp20x_ac_power_match);
> static struct platform_driver axp20x_ac_power_driver = {
> .probe = axp20x_ac_power_probe,
> .driver = {
> - .name = DRVNAME,
> - .of_match_table = axp20x_ac_power_match,
> + .name = DRVNAME,
> + .of_match_table = axp20x_ac_power_match,
> + .pm = &axp20x_ac_power_pm_ops,
> },
> };
>
Otherwise,
Reviewed-by: Chen-Yu Tsai <wens@...e.org>
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