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

Jeff LaBundy
2019-10-21T04:19:14Z

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);
+ 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);
+ 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