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Date: Sat, 19 Jan 2019 01:03:18 -0800
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Linus Walleij <linus.walleij@...aro.org>,
Jacek Anaszewski <jacek.anaszewski@...il.com>,
Pavel Machek <pavel@....cz>, Lee Jones <lee.jones@...aro.org>,
Sebastian Reichel <sre@...nel.org>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
devicetree@...r.kernel.org, linux-input@...r.kernel.org,
linux-leds@...r.kernel.org, linux-pm@...r.kernel.org,
Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 12/13] input: max77650: add onkey support
Hi Bartosz,
On Fri, Jan 18, 2019 at 02:42:43PM +0100, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
>
> Add support for the push- and slide-button events for max77650.
>
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
> drivers/input/misc/Kconfig | 9 ++
> drivers/input/misc/Makefile | 1 +
> drivers/input/misc/max77650-onkey.c | 135 ++++++++++++++++++++++++++++
> 3 files changed, 145 insertions(+)
> create mode 100644 drivers/input/misc/max77650-onkey.c
>
> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
> index ca59a2be9bc5..bb9c45c1269e 100644
> --- a/drivers/input/misc/Kconfig
> +++ b/drivers/input/misc/Kconfig
> @@ -180,6 +180,15 @@ config INPUT_M68K_BEEP
> tristate "M68k Beeper support"
> depends on M68K
>
> +config INPUT_MAX77650_ONKEY
> + tristate "Maxim MAX77650 ONKEY support"
> + depends on MFD_MAX77650
> + help
> + Support the ONKEY of the MAX77650 PMIC as an input device.
> +
> + To compile this driver as a module, choose M here: the module
> + will be called max77650-onkey.
> +
> config INPUT_MAX77693_HAPTIC
> tristate "MAXIM MAX77693/MAX77843 haptic controller support"
> depends on (MFD_MAX77693 || MFD_MAX77843) && PWM
> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
> index 9d0f9d1ff68f..5bd53590ce60 100644
> --- a/drivers/input/misc/Makefile
> +++ b/drivers/input/misc/Makefile
> @@ -43,6 +43,7 @@ obj-$(CONFIG_INPUT_IXP4XX_BEEPER) += ixp4xx-beeper.o
> obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) += keyspan_remote.o
> obj-$(CONFIG_INPUT_KXTJ9) += kxtj9.o
> obj-$(CONFIG_INPUT_M68K_BEEP) += m68kspkr.o
> +obj-$(CONFIG_INPUT_MAX77650_ONKEY) += max77650-onkey.o
> obj-$(CONFIG_INPUT_MAX77693_HAPTIC) += max77693-haptic.o
> obj-$(CONFIG_INPUT_MAX8925_ONKEY) += max8925_onkey.o
> obj-$(CONFIG_INPUT_MAX8997_HAPTIC) += max8997_haptic.o
> diff --git a/drivers/input/misc/max77650-onkey.c b/drivers/input/misc/max77650-onkey.c
> new file mode 100644
> index 000000000000..cc7e83f589cd
> --- /dev/null
> +++ b/drivers/input/misc/max77650-onkey.c
> @@ -0,0 +1,135 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2018 BayLibre SAS
> + * Author: Bartosz Golaszewski <bgolaszewski@...libre.com>
> + *
> + * ONKEY driver for MAXIM 77650/77651 charger/power-supply.
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/input.h>
> +#include <linux/interrupt.h>
> +#include <linux/mfd/max77650.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +
> +#define MAX77650_ONKEY_MODE_MASK BIT(3)
> +#define MAX77650_ONKEY_MODE_PUSH 0x00
> +#define MAX77650_ONKEY_MODE_SLIDE BIT(3)
> +
> +struct max77650_onkey {
> + struct input_dev *input;
> + unsigned int code;
> +};
> +
> +static irqreturn_t
> +max77650_onkey_report(struct max77650_onkey *onkey, int value)
> +{
> + input_report_key(onkey->input, onkey->code, value);
> + input_sync(onkey->input);
> +
> + return IRQ_HANDLED;
It is weird that report function returns irqreturn_t. I'd simply moved
input_report_key()/input_sync() into real IRQ handlers.
> +}
> +
> +static irqreturn_t max77650_onkey_falling(int irq, void *data)
> +{
> + struct max77650_onkey *onkey = data;
> +
> + return max77650_onkey_report(onkey, 0);
> +}
> +
> +static irqreturn_t max77650_onkey_rising(int irq, void *data)
> +{
> + struct max77650_onkey *onkey = data;
> +
> + return max77650_onkey_report(onkey, 1);
> +}
> +
> +static int max77650_onkey_probe(struct platform_device *pdev)
> +{
> + struct regmap_irq_chip_data *irq_data;
> + struct max77650_onkey *onkey;
> + struct device *dev, *parent;
> + int irq_r, irq_f, rv, mode;
Please call "rv" "error".
> + struct i2c_client *i2c;
> + const char *mode_prop;
> + struct regmap *map;
> +
> + dev = &pdev->dev;
> + parent = dev->parent;
> + i2c = to_i2c_client(parent);
> + irq_data = i2c_get_clientdata(i2c);
> +
> + map = dev_get_regmap(parent, NULL);
> + if (!map)
> + return -ENODEV;
> +
> + onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
> + if (!onkey)
> + return -ENOMEM;
> +
> + rv = device_property_read_u32(dev, "linux,code", &onkey->code);
> + if (rv)
> + onkey->code = KEY_POWER;
> +
> + rv = device_property_read_string(dev, "maxim,onkey-mode", &mode_prop);
> + if (rv)
> + mode_prop = "push";
> +
> + if (strcmp(mode_prop, "push") == 0)
> + mode = MAX77650_ONKEY_MODE_PUSH;
> + else if (strcmp(mode_prop, "slide") == 0)
> + mode = MAX77650_ONKEY_MODE_SLIDE;
> + else
> + return -EINVAL;
> +
> + rv = regmap_update_bits(map, MAX77650_REG_CNFG_GLBL,
> + MAX77650_ONKEY_MODE_MASK, mode);
> + if (rv)
> + return rv;
> +
> + irq_f = regmap_irq_get_virq(irq_data, MAX77650_INT_nEN_F);
> + if (irq_f <= 0)
> + return -EINVAL;
> +
> + irq_r = regmap_irq_get_virq(irq_data, MAX77650_INT_nEN_R);
> + if (irq_r <= 0)
> + return -EINVAL;
Ugh, it would be better if you handled IRQ mapping in the MFD piece and
passed it as resources of platform device. Then you'd simply call
platform_get_irq() here and did not have to reach into parent device for
"irq_dara".
> +
> + onkey->input = devm_input_allocate_device(dev);
> + if (!onkey->input)
> + return -ENOMEM;
> +
> + onkey->input->name = "max77650_onkey";
> + onkey->input->phys = "max77650_onkey/input0";
> + onkey->input->id.bustype = BUS_I2C;
> + onkey->input->dev.parent = dev;
Not needed since devm_input_allocate_device sets parent for you.
> + input_set_capability(onkey->input, EV_KEY, onkey->code);
> +
> + rv = devm_request_threaded_irq(dev, irq_f, NULL,
Why threaded interrupt with only hard interrupt handler? If parent
interrupt is threaded use "any_context_irq" here.
> + max77650_onkey_falling,
> + IRQF_ONESHOT, "onkey-down", onkey);
Why do you need oneshot with interrupt that is essentially not threaded?
> + if (rv)
> + return rv;
> +
> + rv = devm_request_threaded_irq(dev, irq_r, NULL,
> + max77650_onkey_rising,
> + IRQF_ONESHOT, "onkey-up", onkey);
> + if (rv)
> + return rv;
> +
> + return input_register_device(onkey->input);
> +}
> +
> +static struct platform_driver max77650_onkey_driver = {
> + .driver = {
> + .name = "max77650-onkey",
> + },
> + .probe = max77650_onkey_probe,
> +};
> +module_platform_driver(max77650_onkey_driver);
> +
> +MODULE_DESCRIPTION("MAXIM 77650/77651 ONKEY driver");
> +MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@...libre.com>");
> +MODULE_LICENSE("GPL");
SPDX header say GPL-2.0 so please "GPL v2" here as "GPL" means v2 and
later.
Thanks.
--
Dmitry
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