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input: keyboard: Add support for Azoteq IQS620A/621/622/624/625
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This patch adds key and switch support for the Azoteq IQS620A,
IQS621, IQS622, IQS624 and IQS625 multi-function sensors.

Signed-off-by: Jeff LaBundy <[email protected]>
Acked-by: Dmitry Torokhov <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
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jlabundy authored and Lee Jones committed Mar 27, 2020
1 parent 4d9cf7d commit ce1cb0e
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10 changes: 10 additions & 0 deletions drivers/input/keyboard/Kconfig
Original file line number Diff line number Diff line change
Expand Up @@ -663,6 +663,16 @@ 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 keys and switches"
depends on MFD_IQS62X
help
Say Y here to enable key and switch support for the Azoteq IQS620A,
IQS621, IQS622, IQS624 and IQS625 multi-function sensors.

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
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1 change: 1 addition & 0 deletions drivers/input/keyboard/Makefile
Original file line number Diff line number Diff line change
Expand Up @@ -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-$(CONFIG_KEYBOARD_IMX_SC_KEY) += imx_sc_key.o
obj-$(CONFIG_KEYBOARD_HP6XX) += jornada680_kbd.o
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335 changes: 335 additions & 0 deletions drivers/input/keyboard/iqs62x-keys.c
Original file line number Diff line number Diff line change
@@ -0,0 +1,335 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Azoteq IQS620A/621/622/624/625 Keys and Switches
*
* Copyright (C) 2019 Jeff LaBundy <[email protected]>
*/

#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/platform_device.h>
#include <linux/property.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 fwnode_handle *child;
unsigned int val;
int ret, i;

ret = device_property_count_u32(&pdev->dev, "linux,keycodes");
if (ret > IQS62X_NUM_KEYS) {
dev_err(&pdev->dev, "Too many keycodes present\n");
return -EINVAL;
} else if (ret < 0) {
dev_err(&pdev->dev, "Failed to count keycodes: %d\n", ret);
return ret;
}
iqs62x_keys->keycodemax = ret;

ret = device_property_read_u32_array(&pdev->dev, "linux,keycodes",
iqs62x_keys->keycode,
iqs62x_keys->keycodemax);
if (ret) {
dev_err(&pdev->dev, "Failed to read keycodes: %d\n", ret);
return ret;
}

for (i = 0; i < ARRAY_SIZE(iqs62x_keys->switches); i++) {
child = device_get_named_child_node(&pdev->dev,
iqs62x_switch_names[i]);
if (!child)
continue;

ret = fwnode_property_read_u32(child, "linux,code", &val);
if (ret) {
dev_err(&pdev->dev, "Failed to read switch code: %d\n",
ret);
return ret;
}
iqs62x_keys->switches[i].code = val;
iqs62x_keys->switches[i].enabled = true;

if (fwnode_property_present(child, "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);
}

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_reg, val;
unsigned int event_mask = 0;
int ret, i;

switch (iqs62x->dev_desc->prod_num) {
case IQS620_PROD_NUM:
case IQS621_PROD_NUM:
case IQS622_PROD_NUM:
event_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);
}

ret = regmap_read(iqs62x->regmap, iqs62x->dev_desc->hall_flags,
&val);
if (ret)
return ret;

/*
* 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_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;

ret = regmap_read(iqs62x->regmap, iqs62x->dev_desc->interval,
&val);
if (ret)
return ret;

iqs62x_keys->interval = val;
break;

default:
return 0;
}

return regmap_update_bits(iqs62x->regmap, event_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 ret, i;

iqs62x_keys = container_of(notifier, struct iqs62x_keys_private,
notifier);

if (event_flags & BIT(IQS62X_EVENT_SYS_RESET)) {
ret = iqs62x_keys_init(iqs62x_keys);
if (ret) {
dev_err(iqs62x_keys->input->dev.parent,
"Failed to re-initialize device: %d\n", ret);
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 complementary release cycle 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 ret, i;

iqs62x_keys = devm_kzalloc(&pdev->dev, sizeof(*iqs62x_keys),
GFP_KERNEL);
if (!iqs62x_keys)
return -ENOMEM;

platform_set_drvdata(pdev, iqs62x_keys);

ret = iqs62x_keys_parse_prop(pdev, iqs62x_keys);
if (ret)
return ret;

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;

for (i = 0; i < iqs62x_keys->keycodemax; i++)
if (iqs62x_keys->keycode[i] != KEY_RESERVED)
input_set_capability(input, EV_KEY,
iqs62x_keys->keycode[i]);

for (i = 0; i < ARRAY_SIZE(iqs62x_keys->switches); i++)
if (iqs62x_keys->switches[i].enabled)
input_set_capability(input, EV_SW,
iqs62x_keys->switches[i].code);

iqs62x_keys->iqs62x = iqs62x;
iqs62x_keys->input = input;

ret = iqs62x_keys_init(iqs62x_keys);
if (ret) {
dev_err(&pdev->dev, "Failed to initialize device: %d\n", ret);
return ret;
}

ret = input_register_device(iqs62x_keys->input);
if (ret) {
dev_err(&pdev->dev, "Failed to register device: %d\n", ret);
return ret;
}

iqs62x_keys->notifier.notifier_call = iqs62x_keys_notifier;
ret = blocking_notifier_chain_register(&iqs62x_keys->iqs62x->nh,
&iqs62x_keys->notifier);
if (ret)
dev_err(&pdev->dev, "Failed to register notifier: %d\n", ret);

return ret;
}

static int iqs62x_keys_remove(struct platform_device *pdev)
{
struct iqs62x_keys_private *iqs62x_keys = platform_get_drvdata(pdev);
int ret;

ret = blocking_notifier_chain_unregister(&iqs62x_keys->iqs62x->nh,
&iqs62x_keys->notifier);
if (ret)
dev_err(&pdev->dev, "Failed to unregister notifier: %d\n", ret);

return ret;
}

static struct platform_driver iqs62x_keys_platform_driver = {
.driver = {
.name = "iqs62x-keys",
},
.probe = iqs62x_keys_probe,
.remove = iqs62x_keys_remove,
};
module_platform_driver(iqs62x_keys_platform_driver);

MODULE_AUTHOR("Jeff LaBundy <[email protected]>");
MODULE_DESCRIPTION("Azoteq IQS620A/621/622/624/625 Keys and Switches");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:iqs62x-keys");

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