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Date:   Tue, 04 May 2021 19:20:27 +0000
To:     "linux-input@vger.kernel.org" <linux-input@vger.kernel.org>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "dmitry.torokhov@gmail.com" <dmitry.torokhov@gmail.com>,
        "robh+dt@kernel.org" <robh+dt@kernel.org>
From:   Yassine Oudjana <y.oudjana@protonmail.com>
Cc:     Yassine Oudjana <y.oudjana@protonmail.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "phone-devel@vger.kernel.org" <phone-devel@vger.kernel.org>,
        "~postmarketos/upstreaming@lists.sr.ht" 
        <~postmarketos/upstreaming@lists.sr.ht>
Reply-To: Yassine Oudjana <y.oudjana@protonmail.com>
Subject: [PATCH v2 1/2] Input: cypress-sf - Add Cypress StreetFighter touchkey driver
Message-ID: <7PLVBAKRbtNysjS13InqsN59dLZarOcTPCpRg8HH4@cp3-web-029.plabs.ch>
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This adds support for Cypress StreetFighter touchkey controllers such as sf=
3155.
This driver supports enabling regulators and generating input events.

Signed-off-by: Yassine Oudjana <y.oudjana@protonmail.com>
---
 drivers/input/keyboard/Kconfig      |  10 ++
 drivers/input/keyboard/Makefile     |   1 +
 drivers/input/keyboard/cypress-sf.c | 219 ++++++++++++++++++++++++++++
 3 files changed, 230 insertions(+)
 create mode 100644 drivers/input/keyboard/cypress-sf.c

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfi=
g
index 32d15809ae58..9348cd604843 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -791,4 +791,14 @@ config KEYBOARD_MTK_PMIC
 =09  To compile this driver as a module, choose M here: the
 =09  module will be called pmic-keys.
=20
+config KEYBOARD_CYPRESS_SF
+=09tristate "Cypress StreetFighter touchkey support"
+=09depends on I2C
+=09help
+=09  Say Y here if you want to enable support for Cypress StreetFighter
+=09  touchkeys.
+
+=09  To compile this driver as a module, choose M here: the
+=09  module will be called cypress-sf.
+
 endif
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makef=
ile
index 1d689fdd5c00..e3c8648f834e 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_KEYBOARD_BCM)=09=09+=3D bcm-keypad.o
 obj-$(CONFIG_KEYBOARD_CAP11XX)=09=09+=3D cap11xx.o
 obj-$(CONFIG_KEYBOARD_CLPS711X)=09=09+=3D clps711x-keypad.o
 obj-$(CONFIG_KEYBOARD_CROS_EC)=09=09+=3D cros_ec_keyb.o
+obj-$(CONFIG_KEYBOARD_CYPRESS_SF)=09+=3D cypress-sf.o
 obj-$(CONFIG_KEYBOARD_DAVINCI)=09=09+=3D davinci_keyscan.o
 obj-$(CONFIG_KEYBOARD_DLINK_DIR685)=09+=3D dlink-dir685-touchkeys.o
 obj-$(CONFIG_KEYBOARD_EP93XX)=09=09+=3D ep93xx_keypad.o
diff --git a/drivers/input/keyboard/cypress-sf.c b/drivers/input/keyboard/c=
ypress-sf.c
new file mode 100644
index 000000000000..49594d983c44
--- /dev/null
+++ b/drivers/input/keyboard/cypress-sf.c
@@ -0,0 +1,219 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/regulator/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/pm.h>
+#include <linux/input.h>
+#include <linux/module.h>
+
+#define CYPRESS_SF_DEV_NAME "cypress-sf"
+
+#define CYPRESS_SF_REG_FW_VERSION=090x46
+#define CYPRESS_SF_REG_HW_VERSION=090x48
+#define CYPRESS_SF_REG_BUTTON_STATUS=090x4a
+
+struct cypress_sf_data {
+=09struct i2c_client *client;
+=09struct input_dev *input_dev;
+=09struct regulator_bulk_data regulators[2];
+=09u32 *keycodes;
+=09unsigned long keystates;
+=09int num_keys;
+};
+
+static irqreturn_t cypress_sf_irq_handler(int irq, void *devid)
+{
+=09struct cypress_sf_data *touchkey =3D devid;
+=09unsigned long keystates;
+=09bool curr_state, new_state;
+=09int key;
+
+=09keystates =3D i2c_smbus_read_byte_data(touchkey->client,
+=09=09=09=09=09CYPRESS_SF_REG_BUTTON_STATUS);
+=09if (keystates < 0) {
+=09=09dev_err(&touchkey->client->dev, "Failed to read button status");
+=09=09return IRQ_NONE;
+=09}
+
+=09for(key =3D 0; key < touchkey->num_keys; ++key) {
+=09=09curr_state =3D test_bit(key, &touchkey->keystates);
+=09=09new_state =3D test_bit(key, &keystates);
+
+=09=09if(curr_state ^ new_state) {
+=09=09=09dev_dbg(&touchkey->client->dev,\
+=09=09=09=09"Key %d changed to %d", key, new_state);
+=09=09=09input_report_key(touchkey->input_dev,
+=09=09=09=09=09touchkey->keycodes[key],
+=09=09=09=09=09new_state);
+=09=09}
+=09}
+=09input_sync(touchkey->input_dev);
+=09touchkey->keystates =3D keystates;
+
+=09return IRQ_HANDLED;
+}
+
+static int cypress_sf_probe(struct i2c_client *client,
+=09=09=09=09const struct i2c_device_id *id)
+{
+=09struct cypress_sf_data *touchkey;
+=09int hw_version, fw_version;
+=09int ret;
+=09int i;
+
+=09touchkey =3D devm_kzalloc(&client->dev, sizeof(*touchkey), GFP_KERNEL);
+=09if(!touchkey)
+=09=09return -ENOMEM;
+
+=09touchkey->client =3D client;
+=09i2c_set_clientdata(client, touchkey);
+
+=09touchkey->regulators[0].supply =3D "vdd";
+=09touchkey->regulators[1].supply =3D "avdd";
+
+=09ret =3D devm_regulator_bulk_get(&client->dev,
+=09=09=09=09=09ARRAY_SIZE(touchkey->regulators),
+=09=09=09=09=09touchkey->regulators);
+=09if(ret) {
+=09=09dev_err(&client->dev, "Failed to get regulators: %d\n", ret);
+=09=09return ret;
+=09}
+
+=09touchkey->num_keys =3D of_property_count_elems_of_size(client->dev.of_n=
ode,
+=09=09=09=09=09=09=09"linux,keycodes",
+=09=09=09=09=09=09=09sizeof(u32));
+=09if(touchkey->num_keys < 0)
+=09=09/* Default key count */
+=09=09touchkey->num_keys =3D 2;
+
+=09touchkey->keycodes =3D devm_kzalloc(&client->dev,
+=09=09=09=09sizeof(u32) * touchkey->num_keys, GFP_KERNEL);
+=09if(!touchkey->keycodes)
+=09=09return -ENOMEM;
+
+=09ret =3D of_property_read_u32_array(client->dev.of_node, "linux,keycodes=
",
+=09=09=09=09=09=09touchkey->keycodes, touchkey->num_keys);
+
+=09if(touchkey->num_keys < 0) {
+=09=09/* Default keycodes */
+=09=09touchkey->keycodes[0] =3D KEY_BACK;
+=09=09touchkey->keycodes[1] =3D KEY_MENU;
+=09}
+
+=09ret =3D regulator_bulk_enable(ARRAY_SIZE(touchkey->regulators),
+=09=09=09=09=09touchkey->regulators);
+=09if(ret) {
+=09=09dev_err(&client->dev, "Failed to enable regulators: %d\n", ret);
+=09=09return ret;
+=09}
+
+=09touchkey->input_dev =3D devm_input_allocate_device(&client->dev);
+=09if(!touchkey->input_dev) {
+=09=09dev_err(&client->dev, "Failed to allocate input device\n");
+=09=09return -ENOMEM;
+=09}
+
+=09touchkey->input_dev->name =3D CYPRESS_SF_DEV_NAME;
+=09touchkey->input_dev->id.bustype =3D BUS_I2C;
+
+=09hw_version =3D i2c_smbus_read_byte_data(touchkey->client,
+=09=09=09=09CYPRESS_SF_REG_HW_VERSION);
+=09fw_version =3D i2c_smbus_read_word_data(touchkey->client,
+=09=09=09=09CYPRESS_SF_REG_FW_VERSION);
+=09if(hw_version < 0 || fw_version < 0)
+=09=09dev_warn(&client->dev, "Failed to read versions\n");
+=09else
+=09=09dev_info(&client->dev, "HW version %d, FW version %d\n",
+=09=09=09=09hw_version, fw_version);
+
+=09for(i =3D 0; i < touchkey->num_keys; ++i)
+=09=09input_set_capability(touchkey->input_dev, EV_KEY,
+=09=09=09=09=09touchkey->keycodes[i]);
+
+=09ret =3D input_register_device(touchkey->input_dev);
+=09if(ret) {
+=09=09dev_err(&client->dev,
+=09=09=09"Failed to register input device: %d\n", ret);
+=09=09return ret;
+=09}
+
+=09ret =3D devm_request_threaded_irq(&client->dev, client->irq,
+=09=09=09=09=09NULL, cypress_sf_irq_handler,
+=09=09=09=09=09IRQF_ONESHOT,
+=09=09=09=09=09CYPRESS_SF_DEV_NAME, touchkey);
+=09if(ret) {
+=09=09dev_err(&client->dev,
+=09=09=09"Failed to register threaded irq: %d", ret);
+=09=09return ret;
+=09}
+
+=09return 0;
+};
+
+static int __maybe_unused cypress_sf_suspend(struct device *dev) {
+=09struct i2c_client *client =3D to_i2c_client(dev);
+=09struct cypress_sf_data *touchkey =3D i2c_get_clientdata(client);
+=09int ret;
+
+=09disable_irq(client->irq);
+=09ret =3D regulator_bulk_disable(ARRAY_SIZE(touchkey->regulators),
+=09=09=09=09=09touchkey->regulators);
+=09if(ret) {
+=09=09dev_err(dev, "Failed to disable regulators: %d", ret);
+=09=09enable_irq(client->irq);
+=09=09return ret;
+=09}
+=09dev_dbg(dev, "Suspended device");
+
+=09return 0;
+}
+
+static int __maybe_unused cypress_sf_resume(struct device *dev) {
+=09struct i2c_client *client =3D to_i2c_client(dev);
+=09struct cypress_sf_data *touchkey =3D i2c_get_clientdata(client);
+=09int ret;
+
+=09ret =3D regulator_bulk_enable(ARRAY_SIZE(touchkey->regulators),
+=09=09=09=09=09touchkey->regulators);
+=09if(ret) {
+=09=09dev_err(dev, "Failed to enable regulators: %d", ret);
+=09=09return ret;
+=09}
+=09enable_irq(client->irq);
+=09dev_dbg(dev, "Resumed device");
+
+=09return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(cypress_sf_pm_ops,
+=09=09=09 cypress_sf_suspend, cypress_sf_resume);
+
+static struct i2c_device_id cypress_sf_id_table[] =3D {
+=09{ CYPRESS_SF_DEV_NAME, 0 },
+=09{ }
+};
+MODULE_DEVICE_TABLE(i2c, cypress_sf_id_table);
+
+static const struct of_device_id cypress_sf_of_match[] =3D {
+=09{ .compatible =3D "cypress,sf3155", },
+=09{ },
+};
+MODULE_DEVICE_TABLE(of, cypress_sf_of_match);
+
+static struct i2c_driver cypress_sf_driver =3D {
+=09.driver =3D {
+=09=09.name =3D CYPRESS_SF_DEV_NAME,
+=09=09.pm =3D &cypress_sf_pm_ops,
+=09=09.of_match_table =3D of_match_ptr(cypress_sf_of_match),
+=09},
+=09.id_table =3D cypress_sf_id_table,
+=09.probe =3D 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");
\ No newline at end of file
--=20
2.31.1