Re: [PATCH 3/8] input: keyboard: Add support for Azoteq IQS620A/621/622/624/625

Dmitry Torokhov
2019-10-23T00:23:00Z

Hi Jeff,

On Sun, Oct 20, 2019 at 11:11:18PM -0500, Jeff LaBundy wrote:
> This patch adds touch key support for six-channel members of the
> Azoteq ProxFusion family of sensor devices.
>
> Signed-off-by: Jeff LaBundy <jeff@labundy.com>
> ---
> drivers/input/keyboard/Kconfig | 10 ++
> drivers/input/keyboard/Makefile | 1 +
> drivers/input/keyboard/iqs62x-keys.c | 340 +++++++++++++++++++++++++++++++++++
> 3 files changed, 351 insertions(+)
> create mode 100644 drivers/input/keyboard/iqs62x-keys.c
>
> diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
> index 8911bc2..ab10aff 100644
> --- a/drivers/input/keyboard/Kconfig
> +++ b/drivers/input/keyboard/Kconfig
> @@ -657,6 +657,16 @@ config KEYBOARD_IPAQ_MICRO
> To compile this driver as a module, choose M here: the
> module will be called ipaq-micro-keys.
>
> +config KEYBOARD_IQS62X
> + tristate "Azoteq IQS620A/621/622/624/625 touch keys"
> + depends on MFD_IQS62X
> + help
> + Say Y here to enable touch-key support for six-channel members of
> + the Azoteq ProxFusion family of sensor devices.
> +
> + To compile this driver as a module, choose M here: the module will
> + be called iqs62x-keys.
> +
> config KEYBOARD_OMAP
> tristate "TI OMAP keypad support"
> depends on ARCH_OMAP1
> diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
> index 9510325..ee85b7f 100644
> --- a/drivers/input/keyboard/Makefile
> +++ b/drivers/input/keyboard/Makefile
> @@ -28,6 +28,7 @@ obj-$(CONFIG_KEYBOARD_TCA8418) += tca8418_keypad.o
> obj-$(CONFIG_KEYBOARD_HIL) += hil_kbd.o
> obj-$(CONFIG_KEYBOARD_HIL_OLD) += hilkbd.o
> obj-$(CONFIG_KEYBOARD_IPAQ_MICRO) += ipaq-micro-keys.o
> +obj-$(CONFIG_KEYBOARD_IQS62X) += iqs62x-keys.o
> obj-$(CONFIG_KEYBOARD_IMX) += imx_keypad.o
> obj-$(CONFIG_KEYBOARD_HP6XX) += jornada680_kbd.o
> obj-$(CONFIG_KEYBOARD_HP7XX) += jornada720_kbd.o
> diff --git a/drivers/input/keyboard/iqs62x-keys.c b/drivers/input/keyboard/iqs62x-keys.c
> new file mode 100644
> index 0000000..9d929f1
> --- /dev/null
> +++ b/drivers/input/keyboard/iqs62x-keys.c
> @@ -0,0 +1,340 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Azoteq IQS620A/621/622/624/625 Touch Keys
> + *
> + * Copyright (C) 2019
> + * Author: Jeff LaBundy <jeff@labundy.com>
> + */
> +
> +#include <linux/device.h>
> +#include <linux/input.h>
> +#include <linux/kernel.h>
> +#include <linux/mfd/iqs62x.h>
> +#include <linux/module.h>
> +#include <linux/notifier.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +
> +enum {
> + IQS62X_SW_HALL_N,
> + IQS62X_SW_HALL_S,
> +};
> +
> +static const char * const iqs62x_switch_names[] = {
> + [IQS62X_SW_HALL_N] = "hall_switch_north",
> + [IQS62X_SW_HALL_S] = "hall_switch_south",
> +};
> +
> +struct iqs62x_switch_desc {
> + enum iqs62x_event_flag flag;
> + unsigned int code;
> + bool enabled;
> +};
> +
> +struct iqs62x_keys_private {
> + struct iqs62x_core *iqs62x;
> + struct input_dev *input;
> + struct notifier_block notifier;
> + struct iqs62x_switch_desc switches[ARRAY_SIZE(iqs62x_switch_names)];
> + unsigned int keycode[IQS62X_NUM_KEYS];
> + unsigned int keycodemax;
> + u8 interval;
> +};
> +
> +static int iqs62x_keys_parse_prop(struct platform_device *pdev,
> + struct iqs62x_keys_private *iqs62x_keys)
> +{
> + struct device_node *keys_node = pdev->dev.of_node;
> + struct device_node *hall_node;
> + unsigned int val;
> + int ret, i;
> +
> + if (!keys_node)
> + return 0;
> +
> + ret = of_property_read_variable_u32_array(keys_node, "linux,keycodes",
> + iqs62x_keys->keycode, 0,
> + IQS62X_NUM_KEYS);

I do not think this has to be OF-specific, so please use
device_property_*() API.

> + if (ret < 0) {
> + dev_err(&pdev->dev, "Failed to read keycodes: %d\n", ret);
> + return ret;
> + }
> + iqs62x_keys->keycodemax = ret;
> +
> + for (i = 0; i < ARRAY_SIZE(iqs62x_keys->switches); i++) {
> + hall_node = of_get_child_by_name(keys_node,
> + iqs62x_switch_names[i]);
> + if (!hall_node)
> + continue;
> +
> + ret = of_property_read_u32(hall_node, "linux,code", &val);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "Failed to read switch code: %d\n",
> + ret);
> + of_node_put(hall_node);
> + return ret;
> + }
> +
> + if (of_property_read_bool(hall_node, "azoteq,use-prox"))
> + iqs62x_keys->switches[i].flag = (i == IQS62X_SW_HALL_N ?
> + IQS62X_EVENT_HALL_N_P :
> + IQS62X_EVENT_HALL_S_P);
> + else
> + iqs62x_keys->switches[i].flag = (i == IQS62X_SW_HALL_N ?
> + IQS62X_EVENT_HALL_N_T :
> + IQS62X_EVENT_HALL_S_T);
> +
> + iqs62x_keys->switches[i].code = val;
> + iqs62x_keys->switches[i].enabled = true;
> +
> + of_node_put(hall_node);
> + }
> +
> + return 0;
> +}
> +
> +static int iqs62x_keys_init(struct iqs62x_keys_private *iqs62x_keys)
> +{
> + struct iqs62x_core *iqs62x = iqs62x_keys->iqs62x;
> + enum iqs62x_event_flag flag;
> + unsigned int event_mask_reg;
> + unsigned int event_mask = 0;
> + unsigned int val;
> + int error, i;
> +
> + switch (iqs62x->dev_desc->prod_num) {
> + case IQS620_PROD_NUM:
> + case IQS621_PROD_NUM:
> + case IQS622_PROD_NUM:
> + event_mask_reg = IQS620_GLBL_EVENT_MASK;
> +
> + /*
> + * Discreet button, hysteresis and SAR UI flags represent keys
> + * and are unmasked if mapped to a valid keycode.
> + */
> + for (i = 0; i < iqs62x_keys->keycodemax; i++) {
> + if (iqs62x_keys->keycode[i] == KEY_RESERVED)
> + continue;
> +
> + if (iqs62x_events[i].reg == IQS62X_EVENT_PROX)
> + event_mask |= iqs62x->dev_desc->prox_mask;
> + else if (iqs62x_events[i].reg == IQS62X_EVENT_HYST)
> + event_mask |= (iqs62x->dev_desc->hyst_mask |
> + iqs62x->dev_desc->sar_mask);
> + }
> +
> + error = regmap_read(iqs62x->map, iqs62x->dev_desc->hall_flags,
> + &val);
> + if (error)
> + return error;
> +
> + /*
> + * Hall UI flags represent switches and are unmasked if their
> + * corresponding child nodes are present.
> + */
> + for (i = 0; i < ARRAY_SIZE(iqs62x_keys->switches); i++) {
> + if (!(iqs62x_keys->switches[i].enabled))
> + continue;
> +
> + flag = iqs62x_keys->switches[i].flag;
> +
> + if (iqs62x_events[flag].reg != IQS62X_EVENT_HALL)
> + continue;
> +
> + event_mask |= iqs62x->dev_desc->hall_mask;
> +
> + input_report_switch(iqs62x_keys->input,
> + iqs62x_keys->switches[i].code,
> + (val & iqs62x_events[flag].mask) ==
> + iqs62x_events[flag].val);
> + }
> +
> + input_sync(iqs62x_keys->input);
> + break;
> +
> + case IQS624_PROD_NUM:
> + event_mask_reg = IQS624_HALL_UI;
> +
> + /*
> + * Interval change events represent keys and are unmasked if
> + * either wheel movement flag is mapped to a valid keycode.
> + */
> + if (iqs62x_keys->keycode[IQS62X_EVENT_WHEEL_UP] != KEY_RESERVED)
> + event_mask |= IQS624_HALL_UI_INT_EVENT;
> +
> + if (iqs62x_keys->keycode[IQS62X_EVENT_WHEEL_DN] != KEY_RESERVED)
> + event_mask |= IQS624_HALL_UI_INT_EVENT;
> +
> + error = regmap_read(iqs62x->map, iqs62x->dev_desc->interval,
> + &val);
> + if (error)
> + return error;
> +
> + iqs62x_keys->interval = val;
> + break;
> +
> + default:
> + return 0;
> + }
> +
> + return regmap_update_bits(iqs62x->map, event_mask_reg, event_mask, 0);
> +}
> +
> +static int iqs62x_keys_notifier(struct notifier_block *notifier,
> + unsigned long event_flags, void *context)
> +{
> + struct iqs62x_event_data *event_data = context;
> + struct iqs62x_keys_private *iqs62x_keys;
> + int error, i;
> +
> + iqs62x_keys = container_of(notifier, struct iqs62x_keys_private,
> + notifier);
> +
> + if (event_flags & BIT(IQS62X_EVENT_SYS_RESET)) {
> + error = iqs62x_keys_init(iqs62x_keys);
> + if (error) {
> + dev_err(iqs62x_keys->input->dev.parent,
> + "Failed to re-initialize device: %d\n", error);
> + return NOTIFY_BAD;
> + }
> +
> + return NOTIFY_OK;
> + }
> +
> + for (i = 0; i < iqs62x_keys->keycodemax; i++) {
> + if (iqs62x_events[i].reg == IQS62X_EVENT_WHEEL &&
> + event_data->interval == iqs62x_keys->interval)
> + continue;
> +
> + input_report_key(iqs62x_keys->input, iqs62x_keys->keycode[i],
> + event_flags & BIT(i));
> + }
> +
> + for (i = 0; i < ARRAY_SIZE(iqs62x_keys->switches); i++)
> + if (iqs62x_keys->switches[i].enabled)
> + input_report_switch(iqs62x_keys->input,
> + iqs62x_keys->switches[i].code,
> + event_flags &
> + BIT(iqs62x_keys->switches[i].flag));
> +
> + input_sync(iqs62x_keys->input);
> +
> + if (event_data->interval == iqs62x_keys->interval)
> + return NOTIFY_OK;
> +
> + /*
> + * Each frame contains at most one wheel event (up or down), in which
> + * case a full keystroke is emulated.
> + */
> + if (event_flags & BIT(IQS62X_EVENT_WHEEL_UP)) {
> + input_report_key(iqs62x_keys->input,
> + iqs62x_keys->keycode[IQS62X_EVENT_WHEEL_UP],
> + 0);
> + input_sync(iqs62x_keys->input);
> + } else if (event_flags & BIT(IQS62X_EVENT_WHEEL_DN)) {
> + input_report_key(iqs62x_keys->input,
> + iqs62x_keys->keycode[IQS62X_EVENT_WHEEL_DN],
> + 0);

Not '1'?

> + input_sync(iqs62x_keys->input);
> + }
> +
> + iqs62x_keys->interval = event_data->interval;
> +
> + return NOTIFY_OK;
> +}
> +
> +static int iqs62x_keys_probe(struct platform_device *pdev)
> +{
> + struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent);
> + struct iqs62x_keys_private *iqs62x_keys;
> + struct input_dev *input;
> + int error, i;
> +
> + iqs62x_keys = devm_kzalloc(&pdev->dev, sizeof(*iqs62x_keys),
> + GFP_KERNEL);
> + if (!iqs62x_keys)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, iqs62x_keys);
> +
> + error = iqs62x_keys_parse_prop(pdev, iqs62x_keys);
> + if (error)
> + return error;
> +
> + input = devm_input_allocate_device(&pdev->dev);
> + if (!input)
> + return -ENOMEM;
> +
> + input->keycodemax = iqs62x_keys->keycodemax;
> + input->keycode = iqs62x_keys->keycode;
> + input->keycodesize = sizeof(*iqs62x_keys->keycode);
> +
> + input->name = iqs62x->dev_desc->dev_name;
> + input->id.bustype = BUS_I2C;
> +
> + __set_bit(EV_KEY, input->evbit);
> +
> + for (i = 0; i < iqs62x_keys->keycodemax; i++)
> + __set_bit(iqs62x_keys->keycode[i], input->keybit);
> +
> + __clear_bit(KEY_RESERVED, input->keybit);
> +
> + for (i = 0; i < ARRAY_SIZE(iqs62x_keys->switches); i++)
> + if (iqs62x_keys->switches[i].enabled) {
> + __set_bit(EV_SW, input->evbit);
> + __set_bit(iqs62x_keys->switches[i].code, input->swbit);
> + }
> +
> + iqs62x_keys->iqs62x = iqs62x;
> + iqs62x_keys->input = input;
> +
> + error = iqs62x_keys_init(iqs62x_keys);
> + if (error) {
> + dev_err(&pdev->dev, "Failed to initialize device: %d\n", error);
> + return error;
> + }
> +
> + error = input_register_device(iqs62x_keys->input);
> + if (error) {
> + dev_err(&pdev->dev, "Failed to register device: %d\n", error);
> + return error;
> + }
> +
> + iqs62x_keys->notifier.notifier_call = iqs62x_keys_notifier;
> + error = blocking_notifier_chain_register(&iqs62x_keys->iqs62x->nh,
> + &iqs62x_keys->notifier);
> + if (error)
> + dev_err(&pdev->dev, "Failed to register notifier: %d\n", error);
> +
> + return error;
> +}
> +
> +static int iqs62x_keys_remove(struct platform_device *pdev)
> +{
> + struct iqs62x_keys_private *iqs62x_keys = platform_get_drvdata(pdev);
> + int error;
> +
> + error = blocking_notifier_chain_unregister(&iqs62x_keys->iqs62x->nh,
> + &iqs62x_keys->notifier);
> + if (error)
> + dev_err(&pdev->dev,
> + "Failed to unregister notifier: %d\n", error);
> +
> + return error;
> +}
> +
> +static struct platform_driver iqs62x_keys_platform_driver = {
> + .driver = {
> + .name = IQS62X_DRV_NAME_KEYS,
> + },
> + .probe = iqs62x_keys_probe,
> + .remove = iqs62x_keys_remove,
> +};
> +module_platform_driver(iqs62x_keys_platform_driver);
> +
> +MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
> +MODULE_DESCRIPTION("Azoteq IQS620A/621/622/624/625 Touch Keys");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:" IQS62X_DRV_NAME_KEYS);
> --
> 2.7.4
>

Thanks.

--
Dmitry