Hi Neil,

On 8/7/2010 2:02 AM, Neil Leeder wrote:

This driver is for the QCI trackpad used on Quanta smartbooks

Review URL: http://codereview.chromium.org/724001

Do we need such URLs? 

+
+/*
+ * Driver communicates over i2c to nuvoTon WPCE775x Embedded Controller,
+ * which has touchpad attached through PS/2 interface.
+ */

Why this driver is not developed through MFD architecture then? nuvoTon chip
looks like multi-function chip, isn't it?

+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/input/qci_touchpad.h>
+
+#define TOUCHPAD_ID_NAME          "qci-i2cpad"
+#define TOUCHPAD_NAME             "QCI Touchpad"
+#define TOUCHPAD_DEVICE           "/qci_touchpad/input0"
+#define TOUCHPAD_CMD_ENABLE       0xF4
+#define TOUCHPAD_READ_DATA_LEN    3
+
+struct i2ctpad_drv_data {
+	struct i2c_client *ti2c_client;
+	struct input_dev *qcitp_dev;
+	unsigned int qcitp_gpio;
+	unsigned int qcitp_irq;
+	char ecdata[8];
+	bool opened;
+};
+
+
+static const struct i2c_device_id qcitp_idtable[] = {
+	{ TOUCHPAD_ID_NAME, 0 },

This should be chip name instead of driver or ID name I think. 

+
+	err = gpio_request(context->qcitp_gpio, "qci-pad");
+	if (err) {
+		pr_err("[QCI TouchPad] gpio request failed\n");
+		goto gpio_request_fail;
+	}
+
+	context->qcitp_irq = gpio_to_irq(context->qcitp_gpio);

Please set the direction of the gpio as input, gpio_direction_input, even though gpios
are coming as input by default.

+
+static int __devexit qcitp_remove(struct i2c_client *client)
+{
+	struct i2ctpad_drv_data *context = i2c_get_clientdata(client);
+
+	free_irq(context->qcitp_irq, context);
+	gpio_free(context->qcitp_gpio);
+	input_unregister_device(context->qcitp_dev);
+	i2c_set_clientdata(client, NULL);

Not required in latest kernels.

---Trilok Soni

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