This driver is to support Cypress CY8CMBR3XXX family controller,
which is used as button input for Intel platforms.
Signed-off-by: Qipeng Zha <qipeng.zha@xxxxxxxxx>
---
drivers/input/keyboard/Kconfig | 7 +
drivers/input/keyboard/Makefile | 1 +
drivers/input/keyboard/cypress-keyboard.c | 278 ++++++++++++++++++++++++++++++
3 files changed, 286 insertions(+)
create mode 100644 drivers/input/keyboard/cypress-keyboard.c
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index a89ba7c..f39f148 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -686,4 +686,11 @@ config KEYBOARD_CAP11XX
To compile this driver as a module, choose M here: the
module will be called cap11xx.
+config KEYBOARD_CYPRESS_BUTTON
+ tristate "Cypress Button"
+ depends on I2C
+ help
+ Say Y here to enable support for Cypress button for
+ Intel platforms.
+
endif
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 4707678..5a73138 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -60,3 +60,4 @@ obj-$(CONFIG_KEYBOARD_TEGRA) += tegra-kbc.o
obj-$(CONFIG_KEYBOARD_TWL4030) += twl4030_keypad.o
obj-$(CONFIG_KEYBOARD_XTKBD) += xtkbd.o
obj-$(CONFIG_KEYBOARD_W90P910) += w90p910_keypad.o
+obj-$(CONFIG_KEYBOARD_CYPRESS_BUTTON) += cypress-keyboard.o
diff --git a/drivers/input/keyboard/cypress-keyboard.c b/drivers/input/keyboard/cypress-keyboard.c
new file mode 100644
index 0000000..4a2e7f7
--- /dev/null
+++ b/drivers/input/keyboard/cypress-keyboard.c
@@ -0,0 +1,278 @@
+/*
+ * Cypress button driver
+ *
+ * Copyright (c) 2015, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/acpi.h>
+
+/* registers */
+#define SENSOR_EN 0x0
+#define SENSOR_CS0 0
+#define SENSOR_CS1 1
+#define BUTTON_STAT 0xAA
+#define BUTTON_ACTIVE 1
+
+/* retry I2C transfer in case of autosleep */
+#define I2C_RETRY_TIMES 10
+
+struct cy_kb {
+ struct i2c_client *client;
+ struct input_dev *input_dev;
+ struct mutex mutex;
+ unsigned int irq;
+ int gpio;
+ u16 button_status;
+ bool suspended;
+};
+
+static int cy_kb_read(struct cy_kb *data,
+ u16 reg, u16 len, void *buf)
+{
+ int ret;
+ u8 regbuf[1];
+ struct i2c_msg xfer[2];
+ int retry = I2C_RETRY_TIMES;
+
+ regbuf[0] = reg & 0xff;
+
+ xfer[0].addr = data->client->addr;
+ xfer[0].flags = 0;
+ xfer[0].len = sizeof(regbuf);
+ xfer[0].buf = regbuf;
+
+ xfer[1].addr = data->client->addr;
+ xfer[1].flags = I2C_M_RD;
+ xfer[1].len = len;
+ xfer[1].buf = buf;
+
+retry_read:
+ ret = i2c_transfer(data->client->adapter, xfer, ARRAY_SIZE(xfer));
+ if (ret != ARRAY_SIZE(xfer)) {
+ if (retry--) {
+ dev_dbg(&data->client->dev, "i2c read retry\n");
+ goto retry_read;
+ } else {
+ dev_err(&data->client->dev, "i2c transfer failed (%d)\n",
+ ret);
+ return -EIO;
+ }
+ }
+
+ return 0;
+}
+
+static int cy_kb_write(struct cy_kb *data, u8 reg, u16 val)
+{
+ int ret;
+ u8 *buf;
+ int count;
+ int retry = I2C_RETRY_TIMES;
+
+ count = sizeof(val) + 1;
+ buf = kmalloc(count, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ buf[0] = reg & 0xff;
+ memcpy(&buf[1], &val, sizeof(val));
+
+retry_write:
+ ret = i2c_master_send(data->client, buf, count);
+ if (ret != count) {
+ if (retry--) {
+ dev_dbg(&data->client->dev, "i2c write retry\n");
+ goto retry_write;
+ } else {
+ dev_err(&data->client->dev, "i2c send failed (%d)\n",
+ ret);
+ ret = -EIO;
+ }
+ } else {
+ ret = 0;
+ }
+
+ kfree(buf);
+ return ret;
+}
+
+static irqreturn_t cy_kb_interrupt(int irq, void *dev_id)
+{
+ int ret;
+ u8 buf = 0x0;
+ struct cy_kb *data = dev_id;
+
+ mutex_lock(&data->mutex);
+
+ ret = cy_kb_read(data, BUTTON_STAT, sizeof(buf), &buf);
+ if (ret) {
+ dev_err(&data->client->dev, "can't read button status\n");
+ goto out;
+ }
+ dev_dbg(&data->client->dev, "Button status 0x%02x\n", buf);
+
+ if ((buf ^ data->button_status) & (BUTTON_ACTIVE << SENSOR_CS0)) {
+ input_event(data->input_dev, EV_KEY, KEY_BACK,
+ (buf >> SENSOR_CS0) & BUTTON_ACTIVE);
+ }
+
+ if ((buf ^ data->button_status) & (BUTTON_ACTIVE << SENSOR_CS1)) {
+ input_event(data->input_dev, EV_KEY, KEY_MENU,
+ (buf >> SENSOR_CS1) & BUTTON_ACTIVE);
+ }
+
+ input_sync(data->input_dev);
+ data->button_status = buf;
+out:
+ mutex_unlock(&data->mutex);
+ return IRQ_HANDLED;
+}
+
+static int cy_kb_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret;
+ struct cy_kb *data;
+ struct gpio_desc *gpio;
+
+ data = devm_kzalloc(&client->dev, sizeof(struct cy_kb), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, data);
+ mutex_init(&data->mutex);
+ data->client = client;
+ data->irq = client->irq;
+ gpio = devm_gpiod_get_index(&client->dev, "cypress_gpio_int", 0);
+ if (!IS_ERR(gpio)) {
+ data->gpio = desc_to_gpio(gpio);
+ data->irq = gpiod_to_irq(gpio_to_desc(data->gpio));
+ } else
+ dev_err(&client->dev, "Failed to get gpio interrupt\n");
+
+ ret = request_threaded_irq(data->irq, NULL, cy_kb_interrupt,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ client->name, data);
+ if (ret) {
+ dev_err(&client->dev, "Failed to register irq\n");
+ return ret;
+ }
+
+ data->input_dev = input_allocate_device();
+ if (!data->input_dev) {
+ dev_err(&client->dev, "Failed to allocate input device\n");
+ ret = -ENOMEM;
+ goto err_alloc_input;
+ }
+ data->input_dev->name = client->name;
+ data->input_dev->id.bustype = BUS_I2C;
+ data->input_dev->dev.parent = &data->client->dev;
+ input_set_capability(data->input_dev, EV_KEY, KEY_BACK);
+ input_set_capability(data->input_dev, EV_KEY, KEY_MENU);
+ ret = input_register_device(data->input_dev);
+ if (ret) {
+ dev_err(&client->dev, "Failed to register input device\n");
+ goto err_reg_input;
+ }
+
+ return 0;
+
+err_reg_input:
+ input_free_device(data->input_dev);
+err_alloc_input:
+ free_irq(data->irq, data);
+ gpio_free(data->gpio);
+
+ return ret;
+}
+
+static int cy_kb_remove(struct i2c_client *client)
+{
+ struct cy_kb *data = i2c_get_clientdata(client);
+
+ free_irq(data->irq, data);
+ gpio_free(data->gpio);
+ input_unregister_device(data->input_dev);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int cy_kb_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct cy_kb *data = i2c_get_clientdata(client);
+
+ mutex_lock(&data->mutex);
+ if (!data->suspended)
+ cy_kb_write(data, SENSOR_EN, 0);
+ data->suspended = true;
+ mutex_unlock(&data->mutex);
+
+ return 0;
+}
+
+static int cy_kb_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct cy_kb *data = i2c_get_clientdata(client);
+
+ mutex_lock(&data->mutex);
+ if (data->suspended) {
+ u16 val = (1 << SENSOR_CS0) | (1 << SENSOR_CS1);
+
+ cy_kb_write(data, SENSOR_EN, val);
+ }
+ data->suspended = false;
+ mutex_unlock(&data->mutex);
+
+ return 0;
+}
+static SIMPLE_DEV_PM_OPS(cy_kb_pm_ops, cy_kb_suspend, cy_kb_resume);
+#endif
+
+static const struct i2c_device_id cy_kb_id[] = {
+ { "CY8M3108:00", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, cy_kb_id);
+
+static struct acpi_device_id cy_kb_acpi_id[] = {
+ { "CY8M3108", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(acpi, cy_kb_acpi_id);
+
+static struct i2c_driver cy_kb_driver = {
+ .driver = {
+ .name = "cypressbutton",
+ .acpi_match_table = ACPI_PTR(cy_kb_acpi_id),
+#ifdef CONFIG_PM_SLEEP
+ .pm = &cy_kb_pm_ops,
+#endif
+ },
+ .probe = cy_kb_probe,
+ .remove = cy_kb_remove,
+ .id_table = cy_kb_id,
+};
+
+module_i2c_driver(cy_kb_driver);
+
+MODULE_AUTHOR("Qipeng Zha<qipeng.zha@xxxxxxxxx>");
+MODULE_DESCRIPTION("Cypress CY8CMBRXXX driver");
+MODULE_LICENSE("GPL v2");
--
1.8.3.2
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