Working evdev and more complete access to the device. Should work with real keypad.

linux_driver/ai2c_platform_data.h

@@ -23,6 +23,7 @@
 typedef struct arduino_i2c_keyboard_platform_data {
 	int gpio_intr_pin;
 	int *keymap;
+	int numkeys;
 } arduino_i2c_keyboard_platform_data_t;
 
 #endif /* _AI2C_PLATFORM_DATA_H */

linux_driver/arduino_i2c.c

@@ -44,10 +44,29 @@
 #define IRQ_GPIO_PIN	9
 #define GPIO_IRQ_NAME	"ai2c_keyboard_irq"
 
-const int default_keymap[] = {
-	0,
+static int default_keymap[] = {
+	KEY_UP,
+	KEY_DOWN,
+	KEY_LEFT,
+	KEY_RIGHT,
+	KEY_A,
+	KEY_B,
+	BTN_START,
+	KEY_SELECT,
+	KEY_DISPLAYTOGGLE,
+	KEY_1,
+	KEY_2,
+	KEY_3,
+	KEY_4,
+	KEY_5,
+	KEY_6,
+	KEY_7,
+	KEY_8,
+	KEY_9
 };
 
+static int default_numkeys = sizeof(default_keymap) / sizeof(int);
+
 static LIST_HEAD(driver_list);
 static DEFINE_MUTEX(driver_list_lock);
 
@@ -61,6 +80,7 @@ device_write_register(struct i2c_client *client, uint8_t raddr, uint8_t value) {
 }
 
 #if 0
+/* ifdef'd out to pacify gcc until we need there */
 static uint8_t
 device_read_byte(struct i2c_client *client) {
 	uint8_t tmp;
@@ -89,16 +109,45 @@ device_read_register(struct i2c_client *client, void *buffer, uint8_t raddr, uin
 
 static void
 ai2c_intr(struct work_struct *work) {
+	int i;
+	uint8_t key_status[6];
+	uint16_t cur, down, up;
 	arduino_i2c_driver_data_t *drv_info = container_of(
 			work, arduino_i2c_driver_data_t, intr_upper_work);
 
 	BUG_ON(!drv_info->client);
 	dev_info(&drv_info->client->dev, "ai2c_intr:  entered\n");
 
-	i2c_smbus_write_byte_data(drv_info->client, 50, 48);
-	input_report_key(drv_info->indev, BTN_0, 1);
-	input_sync(drv_info->indev);
-	input_report_key(drv_info->indev, BTN_0, 0);
+	memset(key_status, 0, sizeof(key_status));
+	for (i = 0; i < 6; i++) {
+		device_read_register(drv_info->client, &(key_status[i]), AI2C_REGISTER_KEY_STATUS_LOW + i, 1);
+	}
+	cur = (uint16_t)key_status[0] | ((uint16_t)key_status[1] << 8);
+	down = (uint16_t)key_status[2] | ((uint16_t)key_status[3] << 8);
+	up = (uint16_t)key_status[4] | ((uint16_t)key_status[5] << 8);
+	for (i = 0; i < 16; i++) {
+		if ((down & (1 << i)) && (up & (1 << i))) {
+			/* Key went down and up since last check - see what it is currently to decide order */
+			if (cur & (1 << i)) {
+				/* The button is currently up so it must have gone down first, then up */
+				input_report_key(drv_info->indev, default_keymap[i], 0);
+				input_sync(drv_info->indev);
+				input_report_key(drv_info->indev, default_keymap[i], 1);
+			} else {
+				/* Other way agound - up first, then down */
+				input_report_key(drv_info->indev, default_keymap[i], 1);
+				input_sync(drv_info->indev);
+				input_report_key(drv_info->indev, default_keymap[i], 0);
+			}
+		} else if (down & (1 << i)) {
+			/* New key down */
+			input_report_key(drv_info->indev, default_keymap[i], 0);
+		} else if (up & (1 << i)) {
+			/* New key up */
+			input_report_key(drv_info->indev, default_keymap[i], 1);
+		}
+	}
+	/* All events before this happened at the "same" time */
 	input_sync(drv_info->indev);
 
 	return;
@@ -118,7 +167,7 @@ ai2c_intr_lower(int irq, void *data) {
 
 static int
 ai2c_probe(struct i2c_client *client, const struct i2c_device_id *id) {
-	int i;
+	int i, keymax;
 	int ret = 0;
 	int flags = 0;
 	uint16_t dev_id;
@@ -148,6 +197,9 @@ ai2c_probe(struct i2c_client *client, const struct i2c_device_id *id) {
 	dev_info(&client->dev, "Device ID: 0x%04x\nDevice Revision: 0x%02x\nDevice Firmware Build: \"%s\"\n",
 			dev_id, dev_rev, dev_build_str);
 
+	/*
+	 * Allocate/initialize driver data
+	 */
 	drv_info = (arduino_i2c_driver_data_t *)kmalloc(sizeof(arduino_i2c_driver_data_t), GFP_KERNEL);
 	if (!drv_info) {
 		dev_err(&client->dev, "Unable to allocate driver memory");
@@ -156,6 +208,9 @@ ai2c_probe(struct i2c_client *client, const struct i2c_device_id *id) {
 	}
 	memset(drv_info, 0, sizeof(arduino_i2c_driver_data_t));
 
+	/*
+	 * Get GPIO pin for interrupts
+	 */
 	ret = gpio_request(pdata->gpio_intr_pin, GPIO_IRQ_NAME);
 	if (ret < 0) {
 		dev_err(&client->dev, "ai2c:  IRQ pin reservation of %d failed:  error %d", pdata->gpio_intr_pin, ret);
@@ -175,6 +230,9 @@ ai2c_probe(struct i2c_client *client, const struct i2c_device_id *id) {
 
 	dev_dbg(&client->dev, "ai2c:  Reserved pin [%d]:  irq = %d\n", pdata->gpio_intr_pin, drv_info->irq_num);
 
+	/*
+	 * Register for key press IRQ
+	 */
 	flags |= IRQF_TRIGGER_FALLING;
 	ret = request_irq(drv_info->irq_num, ai2c_intr_lower, flags, "ai2c_keyboard", drv_info);
 	if (ret < 0) {
@@ -189,17 +247,32 @@ ai2c_probe(struct i2c_client *client, const struct i2c_device_id *id) {
 			goto out_cleanirq;
 	}
 
+	/*
+	 * Set up input device
+	 */
+	if (pdata->keymap) {
+		drv_info->keymap = pdata->keymap;
+		drv_info->numkeys = pdata->numkeys;
+	} else {
+		drv_info->keymap = default_keymap;
+		drv_info->numkeys = default_numkeys;
+	}
 	drv_info->indev->name = "arduino_i2c";
 	drv_info->indev->phys = "arduino_i2c/input0";
 	drv_info->indev->dev.parent = &client->dev;
 	drv_info->indev->id.bustype = BUS_I2C;
-	drv_info->indev->id.vendor = 0x4242;
-	drv_info->indev->id.product = 0x4242;
+	drv_info->indev->id.vendor = AI2C_ID;
+	drv_info->indev->id.product = AI2C_ID;
 	drv_info->indev->id.version = 0x0001;
 	drv_info->indev->keycodesize = sizeof(unsigned short);
-	drv_info->indev->keycodemax = BTN_0 + 1;
 	drv_info->indev->evbit[0] = BIT_MASK(EV_KEY);
-	drv_info->indev->keybit[BIT_WORD(BTN_0)] = BIT_MASK(BTN_0);
+	keymax = -1;
+	for (i = 0; i < drv_info->numkeys; i++) {
+		drv_info->indev->keybit[BIT_WORD(drv_info->keymap[i])] |= BIT_MASK(drv_info->keymap[i]);
+		keymax = (drv_info->keymap[i] > keymax) ? drv_info->keymap[i] : keymax;
+	}
+	drv_info->indev->keycodemax = keymax + 1;
+
 	ret = input_register_device(drv_info->indev);
 	if (ret) {
 		dev_err(&client->dev, "ai2c:  unable to register input device: %d", ret);
@@ -225,7 +298,7 @@ out_cleanindev:
 out_cleanirq:
 	free_irq(drv_info->irq_num, drv_info);
 out_cleanup:
-	gpio_free(drv_info->irq_num);
+	gpio_free(drv_info->irq_pin);
 out_dealloc:
 	kfree(drv_info);
 out:
@@ -241,7 +314,7 @@ ai2c_remove(struct i2c_client *client) {
 
 	flush_work(&drv_info->intr_upper_work);
 
-	gpio_free(drv_info->irq_num);
+	gpio_free(drv_info->irq_pin);
 
 	dev_set_drvdata(&drv_info->client->dev, NULL);
 
@@ -273,7 +346,7 @@ static struct i2c_driver ai2c_driver = {
 	.id_table = ai2c_id,
 };
 
-int
+static int
 ai2c_init(void) {
 	int ret;
 	printk(KERN_INFO "Arduino I2C Keyboard Starting\n");
@@ -284,7 +357,7 @@ ai2c_init(void) {
 	return ret;
 }
 
-void
+static void
 ai2c_shutdown(void) {
 	printk(KERN_INFO "Arduino I2C Keyboard Shutting Down\n");