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// SPDX-License-Identifier: GPL-2.0-only
/*
* Cypress StreetFighter Touchkey Driver
*
* Copyright (c) 2021 Yassine Oudjana <y.oudjana@protonmail.com>
*/
#include <linux/bitmap.h>
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <linux/regulator/consumer.h>
#define CYPRESS_SF_DEV_NAME "cypress-sf"
#define CYPRESS_SF_REG_BUTTON_STATUS 0x4a
struct cypress_sf_data {
struct i2c_client *client;
struct input_dev *input_dev;
struct regulator_bulk_data regulators[2];
u32 *keycodes;
unsigned long keystates;
int num_keys;
};
static irqreturn_t cypress_sf_irq_handler(int irq, void *devid)
{
struct cypress_sf_data *touchkey = devid;
unsigned long keystates, changed;
bool new_state;
int val, key;
val = i2c_smbus_read_byte_data(touchkey->client,
CYPRESS_SF_REG_BUTTON_STATUS);
if (val < 0) {
dev_err(&touchkey->client->dev,
"Failed to read button status: %d", val);
return IRQ_NONE;
}
keystates = val;
bitmap_xor(&changed, &keystates, &touchkey->keystates,
touchkey->num_keys);
for_each_set_bit(key, &changed, touchkey->num_keys) {
new_state = keystates & BIT(key);
dev_dbg(&touchkey->client->dev,
"Key %d changed to %d", key, new_state);
input_report_key(touchkey->input_dev,
touchkey->keycodes[key], new_state);
}
input_sync(touchkey->input_dev);
touchkey->keystates = keystates;
return IRQ_HANDLED;
}
static void cypress_sf_disable_regulators(void *arg)
{
struct cypress_sf_data *touchkey = arg;
regulator_bulk_disable(ARRAY_SIZE(touchkey->regulators),
touchkey->regulators);
}
static int cypress_sf_probe(struct i2c_client *client)
{
struct cypress_sf_data *touchkey;
int key, error;
touchkey = devm_kzalloc(&client->dev, sizeof(*touchkey), GFP_KERNEL);
if (!touchkey)
return -ENOMEM;
touchkey->client = client;
i2c_set_clientdata(client, touchkey);
touchkey->regulators[0].supply = "vdd";
touchkey->regulators[1].supply = "avdd";
error = devm_regulator_bulk_get(&client->dev,
ARRAY_SIZE(touchkey->regulators),
touchkey->regulators);
if (error) {
dev_err(&client->dev, "Failed to get regulators: %d\n", error);
return error;
}
touchkey->num_keys = device_property_read_u32_array(&client->dev,
"linux,keycodes",
NULL, 0);
if (touchkey->num_keys < 0) {
/* Default key count */
touchkey->num_keys = 2;
}
touchkey->keycodes = devm_kcalloc(&client->dev,
touchkey->num_keys,
sizeof(*touchkey->keycodes),
GFP_KERNEL);
if (!touchkey->keycodes)
return -ENOMEM;
error = device_property_read_u32_array(&client->dev, "linux,keycodes",
touchkey->keycodes,
touchkey->num_keys);
if (error) {
dev_warn(&client->dev,
"Failed to read keycodes: %d, using defaults\n",
error);
/* Default keycodes */
touchkey->keycodes[0] = KEY_BACK;
touchkey->keycodes[1] = KEY_MENU;
}
error = regulator_bulk_enable(ARRAY_SIZE(touchkey->regulators),
touchkey->regulators);
if (error) {
dev_err(&client->dev,
"Failed to enable regulators: %d\n", error);
return error;
}
error = devm_add_action_or_reset(&client->dev,
cypress_sf_disable_regulators,
touchkey);
if (error)
return error;
touchkey->input_dev = devm_input_allocate_device(&client->dev);
if (!touchkey->input_dev) {
dev_err(&client->dev, "Failed to allocate input device\n");
return -ENOMEM;
}
touchkey->input_dev->name = CYPRESS_SF_DEV_NAME;
touchkey->input_dev->id.bustype = BUS_I2C;
for (key = 0; key < touchkey->num_keys; ++key)
input_set_capability(touchkey->input_dev,
EV_KEY, touchkey->keycodes[key]);
error = input_register_device(touchkey->input_dev);
if (error) {
dev_err(&client->dev,
"Failed to register input device: %d\n", error);
return error;
}
error = devm_request_threaded_irq(&client->dev, client->irq,
NULL, cypress_sf_irq_handler,
IRQF_ONESHOT,
CYPRESS_SF_DEV_NAME, touchkey);
if (error) {
dev_err(&client->dev,
"Failed to register threaded irq: %d", error);
return error;
}
return 0;
};
static int cypress_sf_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct cypress_sf_data *touchkey = i2c_get_clientdata(client);
int error;
disable_irq(client->irq);
error = regulator_bulk_disable(ARRAY_SIZE(touchkey->regulators),
touchkey->regulators);
if (error) {
dev_err(dev, "Failed to disable regulators: %d", error);
enable_irq(client->irq);
return error;
}
return 0;
}
static int cypress_sf_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct cypress_sf_data *touchkey = i2c_get_clientdata(client);
int error;
error = regulator_bulk_enable(ARRAY_SIZE(touchkey->regulators),
touchkey->regulators);
if (error) {
dev_err(dev, "Failed to enable regulators: %d", error);
return error;
}
enable_irq(client->irq);
return 0;
}
static DEFINE_SIMPLE_DEV_PM_OPS(cypress_sf_pm_ops,
cypress_sf_suspend, cypress_sf_resume);
static struct i2c_device_id cypress_sf_id_table[] = {
{ CYPRESS_SF_DEV_NAME, 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, cypress_sf_id_table);
#ifdef CONFIG_OF
static const struct of_device_id cypress_sf_of_match[] = {
{ .compatible = "cypress,sf3155", },
{ },
};
MODULE_DEVICE_TABLE(of, cypress_sf_of_match);
#endif
static struct i2c_driver cypress_sf_driver = {
.driver = {
.name = CYPRESS_SF_DEV_NAME,
.pm = pm_sleep_ptr(&cypress_sf_pm_ops),
.of_match_table = of_match_ptr(cypress_sf_of_match),
},
.id_table = cypress_sf_id_table,
.probe_new = cypress_sf_probe,
};
module_i2c_driver(cypress_sf_driver);
MODULE_AUTHOR("Yassine Oudjana <y.oudjana@protonmail.com>");
MODULE_DESCRIPTION("Cypress StreetFighter Touchkey Driver");
MODULE_LICENSE("GPL v2");
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