mirror of
https://github.com/torvalds/linux.git
synced 2024-11-25 21:51:40 +00:00
22df24590f
Use __free(fwnode_handle) cleanup facility to ensure that references to acquired fwnodes are dropped at appropriate times automatically. Reviewed-by: Jeff LaBundy <jeff@labundy.com> Link: https://lore.kernel.org/r/20240825051627.2848495-9-dmitry.torokhov@gmail.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
334 lines
8.6 KiB
C
334 lines
8.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Azoteq IQS620A/621/622/624/625 Keys and Switches
|
|
*
|
|
* Copyright (C) 2019 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/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)
|
|
{
|
|
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++) {
|
|
struct fwnode_handle *child __free(fwnode_handle) =
|
|
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 void 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);
|
|
}
|
|
|
|
static struct platform_driver iqs62x_keys_platform_driver = {
|
|
.driver = {
|
|
.name = "iqs62x-keys",
|
|
},
|
|
.probe = iqs62x_keys_probe,
|
|
.remove_new = 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 Keys and Switches");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:iqs62x-keys");
|