Add support for Arduino I2C keyboard to MangOH red driver.

linux_kernel_modules/mangoh/mangoh_red_board.c

@@ -10,6 +10,7 @@
 #include <linux/platform_data/at24.h>
 #include <linux/ctype.h>
 
+#include <ai2c_platform_data.h>
 #include "ltc294x-platform-data.h"
 #include "bq24190-platform-data.h"
 #include "bq27xxx_battery.h"
@@ -30,6 +31,7 @@
 #define MANGOH_RED_I2C_BUS_USB_HUB		(MANGOH_RED_I2C_SW_BUS_BASE + 1)
 #define MANGOH_RED_I2C_BUS_GPIO_EXPANDER	(MANGOH_RED_I2C_SW_BUS_BASE + 2)
 #define MANGOH_RED_I2C_BUS_EXP			(MANGOH_RED_I2C_SW_BUS_BASE + 3)
+#define MANGOH_RED_I2C_BUS_AI2C_KBD		(MANGOH_RED_I2C_SW_BUS_BASE + 3)
 
 
 /*
@@ -109,6 +111,7 @@ static struct mangoh_red_driver_data {
 	struct i2c_client* battery_gauge;
 	struct i2c_client* battery_charger;
 	struct i2c_client* gpio_expander;
+	struct i2c_client* ai2c_keyboard;
 	bool mux_initialized;
 	bool iot_slot_registered;
 	bool led_registered;
@@ -154,6 +157,12 @@ static struct sx150x_platform_data mangoh_red_gpio_expander_platform_data = {
 	.reset_during_probe = true,
 
 };
+
+static struct arduino_i2c_keyboard_platform_data mangoh_red_ai2c_keyboard_platform_data = {
+	.gpio_intr_pin	    = 9,	/* Device gets its interrupts on Linux 9 which is schematic 22 */
+	.keymap             = NULL,	/* Use default keymap */
+};
+
 static const struct i2c_board_info mangoh_red_gpio_expander_devinfo = {
 	I2C_BOARD_INFO("sx1509q", 0x3e),
 	.platform_data = &mangoh_red_gpio_expander_platform_data,
@@ -191,6 +200,10 @@ static struct i2c_board_info bq27426_battery_gauge_devinfo = {
 static struct i2c_board_info mangoh_red_battery_charger_devinfo = {
 	I2C_BOARD_INFO("bq24190", 0x6B),
 };
+static struct i2c_board_info mangoh_red_ai2c_keyboard_devinfo = {
+	I2C_BOARD_INFO("ai2c-keys", 0x42),
+	.platform_data = &mangoh_red_ai2c_keyboard_platform_data,
+};
 
 #ifdef ENABLE_IOT_SLOT
 static struct iot_slot_platform_data mangoh_red_iot_slot_pdata = {
@@ -387,6 +400,26 @@ static int mangoh_red_probe(struct platform_device* pdev)
 		goto cleanup;
 	}
 
+	/* Map the Arduino I2C keyboard */
+	dev_dbg(&pdev->dev, "mapping arduino i2c keyboard\n");
+	other_adapter = i2c_get_adapter(MANGOH_RED_I2C_BUS_AI2C_KBD);
+	if (!other_adapter) {
+                dev_err(&pdev->dev,
+                        "Couldn't get I2C bus %d to add the AI2C keyboard.\n",
+                        MANGOH_RED_I2C_BUS_GPIO_EXPANDER);
+                ret = -ENODEV;
+                goto cleanup;
+        }
+	mangoh_red_driver_data.ai2c_keyboard =
+		i2c_new_device(other_adapter, &mangoh_red_ai2c_keyboard_devinfo);
+	i2c_put_adapter(other_adapter);
+	if (!mangoh_red_driver_data.ai2c_keyboard) {
+                dev_err(&pdev->dev, "Failed to register %s\n",
+                        mangoh_red_gpio_expander_devinfo.type);
+                ret = -ENODEV;
+                goto cleanup;
+        }
+
 	gpio_expander = i2c_get_clientdata(
 		mangoh_red_driver_data.gpio_expander);
 #ifdef ENABLE_IOT_SLOT
@@ -497,6 +530,7 @@ static int mangoh_red_remove(struct platform_device* pdev)
 	i2c_unregister_device(dd->battery_charger);
 	i2c_unregister_device(dd->pressure);
 	i2c_unregister_device(dd->accelerometer);
+	i2c_unregister_device(dd->ai2c_keyboard);
 
 	if (dd->led_registered)
 		platform_device_unregister(&mangoh_red_led);