This adds support for the D-Link DIR-685 touchpad found in the
router with this name.
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
MAINTAINERS | 6 +
drivers/input/keyboard/Kconfig | 12 ++
drivers/input/keyboard/Makefile | 1 +
drivers/input/keyboard/dlink-dir685-touchpad.c | 181 +++++++++++++++++++++++++
4 files changed, 200 insertions(+)
create mode 100644 drivers/input/keyboard/dlink-dir685-touchpad.c
diff --git a/MAINTAINERS b/MAINTAINERS
index c265a5fe4848..95ef13b4ae71 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3730,6 +3730,12 @@ S: Supported
F: drivers/input/touchscreen/cyttsp*
F: include/linux/input/cyttsp.h
+D-LINK DIR-685 TOUCHPAD DRIVER
+M: Linus Walleij <linus.walleij@xxxxxxxxxx>
+L: linux-input@xxxxxxxxxxxxxxx
+S: Supported
+F: drivers/input/dlink-dir685-touchpad.c
+
DALLAS/MAXIM DS1685-FAMILY REAL TIME CLOCK
M: Joshua Kinard <kumba@xxxxxxxxxx>
S: Maintained
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index 97acd6524ad7..06b19aa7cdf5 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -178,6 +178,18 @@ config KEYBOARD_CLPS711X
To compile this driver as a module, choose M here: the
module will be called clps711x-keypad.
+config KEYBOARD_DLINK_DIR685
+ tristate "D-Link DIR-685 touchpad support"
+ depends on I2C
+ depends on OF
+ default ARCH_GEMINI
+ help
+ If you say yes here you get support for the D-Link DIR-685
+ touchpad.
+
+ To compile this driver as a module, choose M here: the
+ module will be called dlink-dir685-touchpad.
+
config KEYBOARD_LKKBD
tristate "DECstation/VAXstation LK201/LK401 keyboard"
select SERIO
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 7d9acff819a7..11c1fb5f2426 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_KEYBOARD_CAP11XX) += cap11xx.o
obj-$(CONFIG_KEYBOARD_CLPS711X) += clps711x-keypad.o
obj-$(CONFIG_KEYBOARD_CROS_EC) += cros_ec_keyb.o
obj-$(CONFIG_KEYBOARD_DAVINCI) += davinci_keyscan.o
+obj-$(CONFIG_KEYBOARD_DLINK_DIR685) += dlink-dir685-touchpad.o
obj-$(CONFIG_KEYBOARD_EP93XX) += ep93xx_keypad.o
obj-$(CONFIG_KEYBOARD_GOLDFISH_EVENTS) += goldfish_events.o
obj-$(CONFIG_KEYBOARD_GPIO) += gpio_keys.o
diff --git a/drivers/input/keyboard/dlink-dir685-touchpad.c b/drivers/input/keyboard/dlink-dir685-touchpad.c
new file mode 100644
index 000000000000..559e7e9a9340
--- /dev/null
+++ b/drivers/input/keyboard/dlink-dir685-touchpad.c
@@ -0,0 +1,181 @@
+/*
+ * D-Link DIR-685 router I2C-based Touchpad input driver
+ * Copyright (C) 2017 Linus Walleij <linus.walleij@xxxxxxxxxx>
+ *
+ * This is a one-off touchpad controller based on the Cypress Semiconductor
+ * CY8C214 MCU with some firmware in its internal 8KB flash. The circuit
+ * board inside the router is named E119921
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+
+struct dir685_touchpad {
+ struct device *dev;
+ struct i2c_client *client;
+ struct input_dev *input;
+ unsigned long cur_key;
+ u16 *codes;
+};
+
+static const u16 dir685_tp_keycodes[] = {
+ KEY_UP,
+ KEY_DOWN,
+ KEY_LEFT,
+ KEY_RIGHT,
+ KEY_ENTER,
+ KEY_W,
+ KEY_O,
+};
+
+static irqreturn_t dir685_tp_irq_thread(int irq, void *data)
+{
+ struct dir685_touchpad *tp = data;
+ u8 buf[6];
+ unsigned long key;
+ int i;
+ int ret;
+
+ memset(buf, 0, sizeof(buf));
+ ret = i2c_master_recv(tp->client, buf, sizeof(buf));
+ if (ret != sizeof(buf)) {
+ dev_err(tp->dev, "short read %d\n", ret);
+ return IRQ_HANDLED;
+ }
+
+ dev_dbg(tp->dev, "IN: %02x, %02x, %02x, %02x, %02x, %02x\n",
+ buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
+ key = buf[4] << 8 | buf[5];
+
+ /* Figure out if any bits went high since last message */
+ for_each_set_bit(i, &key, 16) {
+ if (!(tp->cur_key & BIT(i))) {
+ dev_dbg(tp->dev, "key %d down\n", i);
+ if (i < ARRAY_SIZE(dir685_tp_keycodes)) {
+ input_report_key(tp->input,
+ tp->codes[i], 1);
+ }
+ }
+ }
+ /* Figure out if any bits went low since last message */
+ for_each_set_bit(i, &tp->cur_key, 16) {
+ if (!(key & BIT(i))) {
+ dev_dbg(tp->dev, "key %d up\n", i);
+ if (i < ARRAY_SIZE(dir685_tp_keycodes)) {
+ input_report_key(tp->input,
+ tp->codes[i], 0);
+ }
+ }
+ }
+
+ /* Store currently down keys */
+ tp->cur_key = key;
+ input_sync(tp->input);
+
+ return IRQ_HANDLED;
+}
+
+static int dir685_tp_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct dir685_touchpad *tp;
+ struct device *dev = &client->dev;
+ u8 bl_data[] = { 0xa7, 0x40 };
+ int ret;
+ int i;
+
+ tp = devm_kzalloc(&client->dev, sizeof(*tp), GFP_KERNEL);
+ if (!tp)
+ return -ENOMEM;
+
+ tp->input = devm_input_allocate_device(dev);
+ if (!tp->input)
+ return -ENOMEM;
+
+ tp->client = client;
+ tp->dev = dev;
+
+ tp->input->keycodesize = sizeof(dir685_tp_keycodes[0]);
+ tp->input->keycodemax = ARRAY_SIZE(dir685_tp_keycodes);
+ tp->codes = devm_kmemdup(dev, dir685_tp_keycodes,
+ tp->input->keycodesize * tp->input->keycodemax,
+ GFP_KERNEL);
+ tp->input->keycode = tp->codes;
+
+ __set_bit(EV_KEY, tp->input->evbit);
+ for (i = 0; i < ARRAY_SIZE(dir685_tp_keycodes); i++)
+ __set_bit(dir685_tp_keycodes[i], tp->input->keybit);
+
+ tp->input->name = "D-Link DIR-685 touchpad";
+ input_set_drvdata(tp->input, tp);
+
+ ret = input_register_device(tp->input);
+ if (ret)
+ return ret;
+
+ /* Set up the brightness to max level */
+ ret = i2c_master_send(client, bl_data, sizeof(bl_data));
+ if (ret != sizeof(bl_data))
+ dev_err(tp->dev, "error setting up brightness level\n");
+
+ if (!client->irq) {
+ dev_err(dev, "no IRQ on the I2C device\n");
+ return -ENODEV;
+ }
+ ret = request_threaded_irq(client->irq, NULL,
+ dir685_tp_irq_thread,
+ IRQF_ONESHOT,
+ "dir685-tp",
+ tp);
+ if (ret) {
+ dev_err(dev, "can't request IRQ\n");
+ return ret;
+ }
+
+ i2c_set_clientdata(client, tp);
+
+ dev_info(tp->dev, "registered D-Link DIR-685 touchpad\n");
+ return 0;
+}
+
+static int dir685_tp_remove(struct i2c_client *client)
+{
+ struct dir685_touchpad *tp = i2c_get_clientdata(client);
+
+ input_unregister_device(tp->input);
+
+ return 0;
+}
+
+static const struct i2c_device_id dir685_tp_id[] = {
+ { "dir685tp", 0 },
+ { }
+};
+
+static const struct of_device_id dir685_tp_of_match[] = {
+ { .compatible = "dlink,dir685-touchpad" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, dir685_tp_of_match);
+
+static struct i2c_driver dir685_tp_i2c_driver = {
+ .driver = {
+ .name = "dlin-dir685-touchpad",
+ .of_match_table = of_match_ptr(dir685_tp_of_match),
+ },
+ .probe = dir685_tp_probe,
+ .remove = dir685_tp_remove,
+ .id_table = dir685_tp_id,
+};
+MODULE_DEVICE_TABLE(i2c, dir685_tp_id);
+
+module_i2c_driver(dir685_tp_i2c_driver);
+
+MODULE_AUTHOR("Linus Walleij <linus.walleij@xxxxxxxxxx>");
+MODULE_DESCRIPTION("D-Link DIR-685 touchpad driver");
+MODULE_LICENSE("GPL");
--
2.9.3
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