Date:	Fri, 13 Aug 2010 14:06:08 +0530
From:	"Datta, Shubhrajyoti" <shubhrajyoti@...com>
To:	Neil Leeder <nleeder@...eaurora.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Horace Fu <horace.fu@...ntatw.com>,
	Mandeep Singh Baines <msb@...omium.org>
Subject: RE: [PATCH v2] input: mouse: add qci touchpad driver


Minor comments feel free to ignore if you feel so.

> -----Original Message-----
> From: linux-input-owner@...r.kernel.org [mailto:linux-input-
> owner@...r.kernel.org] On Behalf Of Neil Leeder
> Sent: Thursday, August 12, 2010 10:19 PM
> To: Dmitry Torokhov
> Cc: linux-input@...r.kernel.org; linux-arm-msm@...r.kernel.org; linux-
> kernel@...r.kernel.org; Neil Leeder; Horace Fu; Mandeep Singh Baines
> Subject: [PATCH v2] input: mouse: add qci touchpad driver
> 
> This driver is for the QCI trackpad used on Quanta smartbooks
Would you like to mention the part number.
> 
> Signed-off-by: Horace Fu <horace.fu@...ntatw.com>
> Signed-off-by: Mandeep Singh Baines <msb@...omium.org>
> [nleeder@...eaurora.org: cleanup i2c calls, address review comments etc]
> Signed-off-by: Neil Leeder <nleeder@...eaurora.org>
> ---
>  drivers/input/mouse/Kconfig        |   12 ++
>  drivers/input/mouse/Makefile       |    1 +
>  drivers/input/mouse/qci_touchpad.c |  270
> ++++++++++++++++++++++++++++++++++++
>  include/linux/input/qci_touchpad.h |   25 ++++
>  4 files changed, 308 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/input/mouse/qci_touchpad.c
>  create mode 100644 include/linux/input/qci_touchpad.h
> 
> diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
> index c714ca2..32a88b4 100644
> --- a/drivers/input/mouse/Kconfig
> +++ b/drivers/input/mouse/Kconfig
> @@ -303,6 +303,18 @@ config MOUSE_MAPLE
>  	  To compile this driver as a module choose M here: the module will
> be
>  	  called maplemouse.
> 
> +config MOUSE_QCITP
> +	tristate "Quanta Computer Inc. Touchpad"
> +	depends on I2C
> +	help
> +	  This driver supports the touchpad on Quanta smartbook devices.
> +
> +	  Say Y here if you have a Quanta-based smartboot or notepad
> +	  device and want to use the Quanta touchpad driver.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called qci_touchpad.
> +
>  config MOUSE_SYNAPTICS_I2C
>  	tristate "Synaptics I2C Touchpad support"
>  	depends on I2C
> diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
> index 570c84a..6eda35d 100644
> --- a/drivers/input/mouse/Makefile
> +++ b/drivers/input/mouse/Makefile
> @@ -15,6 +15,7 @@ obj-$(CONFIG_MOUSE_MAPLE)		+= maplemouse.o
>  obj-$(CONFIG_MOUSE_PC110PAD)		+= pc110pad.o
>  obj-$(CONFIG_MOUSE_PS2)			+= psmouse.o
>  obj-$(CONFIG_MOUSE_PXA930_TRKBALL)	+= pxa930_trkball.o
> +obj-$(CONFIG_MOUSE_QCITP)		+= qci_touchpad.o
>  obj-$(CONFIG_MOUSE_RISCPC)		+= rpcmouse.o
>  obj-$(CONFIG_MOUSE_SERIAL)		+= sermouse.o
>  obj-$(CONFIG_MOUSE_SYNAPTICS_I2C)	+= synaptics_i2c.o
> diff --git a/drivers/input/mouse/qci_touchpad.c
> b/drivers/input/mouse/qci_touchpad.c
> new file mode 100644
> index 0000000..746cbaa
> --- /dev/null
> +++ b/drivers/input/mouse/qci_touchpad.c
> @@ -0,0 +1,270 @@
> +/* Quanta I2C Touchpad Driver
> + *
> + * Copyright (C) 2009 Quanta Computer Inc.
> + * Copyright (c) 2010, Code Aurora Forum. All rights reserved.
> + * Author: Hsin Wu <hsin.wu@...ntatw.com>
> + * Author: Austin Lai <austin.lai@...ntatw.com>
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +/*
> + * Driver communicates over i2c to nuvoTon WPCE775x Embedded Controller,
> + * which has touchpad attached through PS/2 interface.
> + */
> +#define pr_fmt(fmt) KBUILD_BASENAME ": " fmt
> +
> +#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;
> +};
> +
> +#ifdef CONFIG_PM
> +static int qcitp_suspend(struct device *_dev)
> +{
> +	struct i2c_client *client =
> +		container_of(_dev, struct i2c_client, dev);
> +	struct i2ctpad_drv_data *context = i2c_get_clientdata(client);
> +
> +	disable_irq(context->qcitp_irq);
> +	return 0;
> +}
> +
> +static int qcitp_resume(struct device *_dev)
> +{
> +	struct i2c_client *client =
> +		container_of(_dev, struct i2c_client, dev);
> +	struct i2ctpad_drv_data *context = i2c_get_clientdata(client);
> +
> +	enable_irq(context->qcitp_irq);
> +	return 0;
> +}
> +#endif
> +
> +static const struct i2c_device_id qcitp_idtable[] = {
> +	{ "wpce775-touchpad", 0 },
> +	{ }
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, qcitp_idtable);
> +
> +#ifdef CONFIG_PM
> +static const struct dev_pm_ops qcitp_pm_ops = {
> +	.suspend  = qcitp_suspend,
> +	.resume   = qcitp_resume,
> +};
> +#endif
> +
> +static void qcitp_report_key(struct input_dev *tpad_dev, char *ec_data)
> +{
> +	int dx = 0;
> +	int dy = 0;
> +
> +	if (ec_data[1])
> +		dx = (int) ec_data[1] -
> +		     (int) ((ec_data[0] << 4) & 0x100);
> +
> +	if (ec_data[2])
> +		dy = (int) ((ec_data[0] << 3) & 0x100) -
> +		     (int) ec_data[2];
> +
> +	input_report_key(tpad_dev, BTN_LEFT, ec_data[0] & 0x01);
> +	input_report_key(tpad_dev, BTN_RIGHT, ec_data[0] & 0x02);
> +	input_report_key(tpad_dev, BTN_MIDDLE, ec_data[0] & 0x04);
> +	input_report_rel(tpad_dev, REL_X, dx);
> +	input_report_rel(tpad_dev, REL_Y, dy);
> +	input_sync(tpad_dev);
> +}
> +
> +static irqreturn_t qcitp_interrupt(int irq, void *dev_id)
> +{
> +	struct i2ctpad_drv_data *context = dev_id;
> +	int rc;
> +
> +	rc = i2c_master_recv(context->ti2c_client, context->ecdata,
> +			     TOUCHPAD_READ_DATA_LEN);
> +	if (rc == TOUCHPAD_READ_DATA_LEN)
> +		qcitp_report_key(context->qcitp_dev, context->ecdata);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int qcitp_open(struct input_dev *input)
> +{
> +	struct i2ctpad_drv_data *context = input_get_drvdata(input);
> +	u8 buf[1];
> +	int err = 0;
> +
> +	if (context->opened)
> +		return 0;
> +	context->opened = 1;
> +
> +	buf[0] = TOUCHPAD_CMD_ENABLE;
> +	err = i2c_master_send(context->ti2c_client, buf, 1);
> +	if (err < 0)
> +		goto i2c_fail;
> +	msleep(100);
Could you explain the time or have a #define XXX 

> +	err = i2c_master_recv(context->ti2c_client, buf, 1);
> +
> +i2c_fail:
> +	return err;
> +}
> +
> +static int __devinit qcitp_probe(struct i2c_client *client,
> +				    const struct i2c_device_id *id)
> +{
> +	int err;
> +	struct i2ctpad_drv_data *context;
> +	struct qci_touchpad_platform_data *pd;
> +	int irq_trigger_type;
> +
> +	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
> +		pr_err("i2c functionality failed\n");
> +		return -ENODEV;
> +	}
> +
> +	context = kzalloc(sizeof(struct i2ctpad_drv_data), GFP_KERNEL);
> +	if (!context)
> +		return -ENOMEM;
> +	i2c_set_clientdata(client, context);
> +	context->ti2c_client = client;
> +	context->qcitp_gpio = client->irq;
> +
> +	pd = client->dev.platform_data;
> +	if (pd)
> +		irq_trigger_type = pd->irq_trigger_type;
> +	else
> +		irq_trigger_type = IRQF_TRIGGER_FALLING;
> +
> +	context->qcitp_dev = input_allocate_device();
> +	if (!context->qcitp_dev) {
> +		pr_err("allocating memory failed\n");
> +		err = -ENOMEM;
> +		goto allocate_fail;
> +	}
> +	context->qcitp_dev->name       = TOUCHPAD_NAME;
> +	context->qcitp_dev->phys       = TOUCHPAD_DEVICE;
> +	context->qcitp_dev->id.bustype = BUS_I2C;
> +	context->qcitp_dev->id.vendor  = 0x1050;
> +	context->qcitp_dev->id.product = 0x1;
> +	context->qcitp_dev->id.version = 0x1;
> +	context->qcitp_dev->evbit[0]  = BIT_MASK(EV_KEY) |
> +					BIT_MASK(EV_REL);
> +	context->qcitp_dev->relbit[0] = BIT_MASK(REL_X) |
> +					BIT_MASK(REL_Y);
> +	context->qcitp_dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT)
> |
> +							 BIT_MASK(BTN_MIDDLE) |
> +							 BIT_MASK(BTN_RIGHT);
> +
> +	input_set_drvdata(context->qcitp_dev, context);
> +	context->qcitp_dev->open = qcitp_open;
> +	err = input_register_device(context->qcitp_dev);
> +	if (err) {
> +		pr_err("register device failed\n");
> +		goto register_fail;
> +	}
> +
> +	err = gpio_request(context->qcitp_gpio, "qci-pad");
> +	if (err) {
> +		pr_err("gpio request failed\n");
> +		goto gpio_request_fail;
> +	}
> +	gpio_direction_input(context->qcitp_gpio);
The result is not checked here.

> +
> +	context->qcitp_irq = gpio_to_irq(context->qcitp_gpio);
> +	err = request_threaded_irq(context->qcitp_irq, NULL,
> qcitp_interrupt,
> +				   irq_trigger_type, client->name, context);
> +	if (err) {
> +		pr_err("request threaded irq failed\n");
> +		goto request_irq_fail;
> +	}
> +
> +	return 0;
> +
> +request_irq_fail:
> +	gpio_free(context->qcitp_gpio);
> +
> +gpio_request_fail:
> +	input_unregister_device(context->qcitp_dev);
> +	context->qcitp_dev = NULL;
> +
> +register_fail:
> +	input_free_device(context->qcitp_dev);
You may like to revisit the use of free after unregister.

> +
> +allocate_fail:
> +	kfree(context);
> +	return err;
> +}
> +
> +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);
> +	kfree(context);
> +
> +	return 0;
> +}
> +
> +static struct i2c_driver i2ctp_driver = {
> +	.driver = {
> +		.owner = THIS_MODULE,
> +		.name  = TOUCHPAD_ID_NAME,
> +#ifdef CONFIG_PM
> +		.pm = &qcitp_pm_ops,
> +#endif
> +	},
> +	.probe	  = qcitp_probe,
> +	.remove	  = __devexit_p(qcitp_remove),
> +	.id_table = qcitp_idtable,
> +};
> +
> +static int __init qcitp_init(void)
> +{
> +	return i2c_add_driver(&i2ctp_driver);
> +}
> +
> +
> +static void __exit qcitp_exit(void)
> +{
> +	i2c_del_driver(&i2ctp_driver);
> +}
> +
> +module_init(qcitp_init);
> +module_exit(qcitp_exit);
> +
> +MODULE_AUTHOR("Quanta Computer Inc.");
> +MODULE_DESCRIPTION("Quanta Embedded Controller I2C Touchpad Driver");
> +MODULE_ALIAS("platform:qci-touchpad");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/input/qci_touchpad.h
> b/include/linux/input/qci_touchpad.h
> new file mode 100644
> index 0000000..8e266e4
> --- /dev/null
> +++ b/include/linux/input/qci_touchpad.h
> @@ -0,0 +1,25 @@
> +/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
> + * 02110-1301, USA.
> + */
> +
> +#ifndef __QCI_TOUCHPAD_H
> +#define __QCI_TOUCHPAD_H
> +
> +struct qci_touchpad_platform_data {
> +	unsigned long irq_trigger_type;
> +};
> +
> +#endif
> --
> 1.7.0
> --
> Sent by an employee of the Qualcomm Innovation Center, Inc.
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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