Prev: tracing: wake up tasks reading trace_pipe on write to trace_marker
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From: Neil Leeder on 6 Aug 2010 16:40
This driver is for the QCI trackpad used on Quanta smartbooks

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

Signed-off-by: Horace Fu <horace.fu(a)quantatw.com>
Signed-off-by: Mandeep Singh Baines <msb(a)chromium.org>
[nleeder(a)codeaurora.org: cleanup i2c calls, address review comments etc]
Signed-off-by: Neil Leeder <nleeder(a)codeaurora.org>
---
drivers/input/mouse/Kconfig | 12 ++
drivers/input/mouse/Makefile | 1 +
drivers/input/mouse/qci_touchpad.c | 313 ++++++++++++++++++++++++++++++++++++
include/linux/input/qci_touchpad.h | 25 +++
4 files changed, 351 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 3feeb3a..320db55 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..6865950
--- /dev/null
+++ b/drivers/input/mouse/qci_touchpad.c
@@ -0,0 +1,313 @@
+/* Quanta I2C Touchpad Driver
+ *
+ * Copyright (C) 2009 Quanta Computer Inc.
+ * Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ * Author: Hsin Wu <hsin.wu(a)quantatw.com>
+ * Author: Austin Lai <austin.lai(a)quantatw.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.
+ */
+
+#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 int tp_sense_val = 10;
+
+static ssize_t tp_sensitive_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char * buf)
+{
+ return sprintf(buf, "%d\n", tp_sense_val);
+}
+
+static ssize_t tp_sensitive_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char* buf, size_t n)
+{
+ unsigned int val = 0;
+ sscanf(buf, "%d", &val);
+
+ if (val >= 1 && val <= 10)
+ tp_sense_val = val;
+ else
+ return -ENOSYS;
+
+ return n;
+}
+
+static struct kobj_attribute tp_sensitivity = __ATTR(tp_sensitivity,
+ 0644,
+ tp_sensitive_show,
+ tp_sensitive_store);
+
+static struct attribute *g_tp[] = {
+ &tp_sensitivity.attr,
+ NULL,
+};
+
+static struct attribute_group attr_group = {
+ .attrs = g_tp,
+};
+
+#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[] = {
+ { TOUCHPAD_ID_NAME, 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];
+
+ dx = (dx * tp_sense_val)/10;
+ dy = (dy * tp_sense_val)/10;
+
+ 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);
+ 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("[QCI TouchPad] 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("[QCI TouchPad] 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("[QCI TouchPad] register device failed\n");
+ goto register_fail;
+ }
+
+ 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);
+ err = request_threaded_irq(context->qcitp_irq, NULL, qcitp_interrupt,
+ irq_trigger_type, client->name, context);
+ if (err) {
+ pr_err("[QCI TouchPad] request irq failed\n");
+ goto request_irq_fail;
+ }
+
+ err = sysfs_create_group(&client->dev.kobj, &attr_group);
+ if (err)
+ pr_warning("[QCI TouchPad] sysfs create failed\n");
+
+ 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);
+
+allocate_fail:
+ i2c_set_clientdata(client, NULL);
+ 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);
+ i2c_set_clientdata(client, NULL);
+ 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
--
1.7.1
--
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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