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Message-ID: <CAGS+omAwuW+gPaO9Qh9zfvu7t1FEVj=-6rsfRpR7Y8sHd5Z0vg@mail.gmail.com>
Date: Thu, 12 Apr 2012 00:04:35 +0800
From: Daniel Kurtz <djkurtz@...omium.org>
To: Tom Lin <tom_lin@....com.tw>
Cc: dmitry.torokhov@...il.com, linux-input@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] Input: Elan HID-I2C device driver
On Tue, Apr 10, 2012 at 8:42 PM, Tom Lin <tom_lin@....com.tw> wrote:
> This patch adds driver for Elan I2C touchpad. These protocol of HID-I2C was
> defined by Microsoft. The kernel driver would use the multi-touch protocol
> format B.
>
> Signed-off-by:Tom Lin(Lin Yen Yu) <tom_lin@....com.tw>
> ---
> drivers/input/mouse/Kconfig | 8 +
> drivers/input/mouse/Makefile | 1 +
> drivers/input/mouse/elantech_i2c.c | 504 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 513 insertions(+)
> create mode 100644 drivers/input/mouse/elantech_i2c.c
>
> diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
> index 9b8db82..345cf8c 100644
> --- a/drivers/input/mouse/Kconfig
> +++ b/drivers/input/mouse/Kconfig
> @@ -339,4 +339,12 @@ config MOUSE_SYNAPTICS_USB
> To compile this driver as a module, choose M here: the
> module will be called synaptics_usb.
>
> +config MOUSE_ELANTECH_I2C
I think the KConfig is supposed to be alphabetized... but the Kconfig
file looks like it is already pretty jumbled. I'll leave it to the
experts to express the official opinion.
> + tristate "Elan I2C Touchpad support"
> + depends on I2C
> + help
> + Say Y here if you want to use a Elan HID-I2C touchpad.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called elantech_i2c.
> endif
> diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
> index 4718eff..6f092a3 100644
> --- a/drivers/input/mouse/Makefile
> +++ b/drivers/input/mouse/Makefile
> @@ -20,6 +20,7 @@ obj-$(CONFIG_MOUSE_SERIAL) += sermouse.o
> obj-$(CONFIG_MOUSE_SYNAPTICS_I2C) += synaptics_i2c.o
> obj-$(CONFIG_MOUSE_SYNAPTICS_USB) += synaptics_usb.o
> obj-$(CONFIG_MOUSE_VSXXXAA) += vsxxxaa.o
> +obj-$(CONFIG_MOUSE_ELANTECH_I2C) += elantech_i2c.o
Please alphabetize.
>
> psmouse-objs := psmouse-base.o synaptics.o
>
> diff --git a/drivers/input/mouse/elantech_i2c.c b/drivers/input/mouse/elantech_i2c.c
> new file mode 100644
> index 0000000..3e4b5d4
> --- /dev/null
> +++ b/drivers/input/mouse/elantech_i2c.c
> @@ -0,0 +1,504 @@
> +/*
> + * Elantech I2C Touchpad diver
> + *
> + * Copyright (c) 2011-2012 Tom Lin (Lin Yen Yu) <tom_lin@....com.tw>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published
> + * by the Free Software Foundation.
> + *
> + * Trademarks are the property of their respective owners.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/gpio.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/input.h>
> +#include <linux/input/mt.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/workqueue.h>
> +
> +#define DRIVER_NAME "elantech_i2c"
> +#define ETP_FINGER_DATA_OFFSET 4
> +#define ETP_FINGER_DATA_LEN 5
> +#define ETP_I2C_COMMAND_TRIES 3
> +#define ETP_I2C_COMMAND_DELAY 500
> +/*length of Elan Touchpad information*/
> +#define ETP_INF_LENGTH 2
> +#define ETP_MAX_FINGERS 5
> +#define ETP_PACKET_LENGTH 30
> +#define ETP_REPORT_ID 0X5d
> +#define HID_DES_LENGTH_OFFSET 1
> +
> +static bool elan_i2c_debug;
> +module_param_named(debug, elan_i2c_debug, bool, 0600);
> +MODULE_PARM_DESC(debug, "Turn Elan i2c TP debugging mode on and off");
> +
> +#define elantech_debug(fmt, ...) \
> + do { \
> + if (elan_i2c_debug) \
> + printk(KERN_DEBUG KBUILD_MODNAME \
> + fmt, ##__VA_ARGS__); \
Why not use dev_dbg()
> + } while (0)
> +
> +enum etd_i2c_command {
> + ETP_HID_DESCR_LENGTH_CMD,
> + ETP_HID_DESCR_CMD,
> + ETP_HID_WAKE_UP_CMD,
> + ETP_HID_RESET_CMD,
> + ETP_HID_REPORT_DESCR_CMD,
> + ETP_TRACE_NUM_CMD,
> + ETP_X_AXIS_MAX_CMD,
> + ETP_Y_AXIS_MAX_CMD,
> + ETP_DPI_VALUE_CMD,
> + ETP_ENABLE_ABS_CMD
> +};
> +
> +static const u8 hid_descriptor[] = {0x01, 0x00};
> +static const u8 hid_wake_up[] = {0x05, 0x00, 0x00, 0x08};
> +static const u8 hid_reset_cmd[] = {0x05, 0x00, 0x00, 0x01};
> +static const u8 hid_report_descriptor[] = {0x02, 0x00};
> +static const u8 trace_num_xy[] = {0x05, 0x01};
> +static const u8 x_axis_max[] = {0x06, 0x01};
> +static const u8 y_axis_max[] = {0x07, 0x01};
> +static const u8 dpi_value[] = {0x08, 0x01};
> +static const u8 enable_abs[] = {0x00, 0x03, 0x01, 0x00};
If these are all etc commands, start their names with etc_ and end with _cmd.
In fact, just use a lower case version of the corresponding value from the enum.
> +
> +/* The main device structure */
> +struct elantech_i2c {
> + struct i2c_client *client;
> + struct input_dev *input;
> + struct work_struct work;
> + unsigned int gpio;
> + unsigned int max_x;
> + unsigned int max_y;
> + unsigned int width_x;
> + unsigned int width_y;
> + int irq;
> + u8 pre_recv[28];
> +};
> +
> +static int elantech_i2c_command(struct i2c_client *client, int command,
> + unsigned char *buf_recv, int data_len)
> +{
> + const u8 *cmd = NULL;
> + unsigned char *rec_buf = buf_recv;
> + int ret;
> + int tries = ETP_I2C_COMMAND_TRIES;
> + int length = 0;
> + struct i2c_msg msg[2];
> + int msg_num = 0;
> +
> + switch (command) {
> + case ETP_HID_DESCR_LENGTH_CMD:
> + case ETP_HID_DESCR_CMD:
> + cmd = hid_descriptor;
> + length = sizeof(hid_descriptor);
> + msg[1].len = data_len;
> + msg_num = 2;
> + break;
> + case ETP_HID_WAKE_UP_CMD:
> + cmd = hid_wake_up;
> + length = sizeof(hid_wake_up);
> + msg_num = 1;
> + break;
> + case ETP_HID_RESET_CMD:
> + cmd = hid_reset_cmd;
> + length = sizeof(hid_reset_cmd);
> + msg_num = 1;
> + break;
> + case ETP_HID_REPORT_DESCR_CMD:
> + cmd = hid_report_descriptor;
> + length = sizeof(hid_report_descriptor);
> + msg[1].len = data_len;
> + msg_num = 2;
> + break;
> + case ETP_TRACE_NUM_CMD:
> + cmd = trace_num_xy;
> + length = sizeof(trace_num_xy);
> + msg[1].len = data_len;
> + msg_num = 2;
> + break;
> + case ETP_X_AXIS_MAX_CMD:
> + cmd = x_axis_max;
> + length = sizeof(x_axis_max);
> + msg[1].len = data_len;
> + msg_num = 2;
> + break;
> + case ETP_Y_AXIS_MAX_CMD:
> + cmd = y_axis_max;
> + length = sizeof(y_axis_max);
> + msg[1].len = data_len;
> + msg_num = 2;
> + break;
> + case ETP_DPI_VALUE_CMD:
> + cmd = dpi_value;
> + length = sizeof(dpi_value);
> + msg[1].len = data_len;
> + msg_num = 2;
> + break;
> + case ETP_ENABLE_ABS_CMD:
> + cmd = enable_abs;
> + length = sizeof(enable_abs);
> + msg_num = 1;
> + break;
> + default:
> + elantech_debug("%s command=%d unknow.\n",
> + __func__, command);
> + return -1;
> + }
> +
> + msg[0].addr = client->addr;
> + msg[0].flags = client->flags & I2C_M_TEN;
> + msg[0].len = length;
> + msg[0].buf = (char *) cmd;
> + msg[1].addr = client->addr;
> + msg[1].flags = client->flags & I2C_M_TEN;
> + msg[1].flags |= I2C_M_RD;
> + msg[1].buf = rec_buf;
> +
> + do {
> + ret = i2c_transfer(client->adapter, msg, msg_num);
> + if (ret != msg_num && elan_i2c_debug)
> + print_hex_dump_bytes("Elan I2C Touch data :",
> + DUMP_PREFIX_NONE, rec_buf, msg[1].len);
> + if (ret > 0)
> + break;
> + tries--;
> + elantech_debug("retrying elantech_i2c_command:%d (%d)\n",
> + command, tries);
> + } while (tries > 0);
> +
> + return ret;
> +}
> +
> +static bool elantech_i2c_hw_init(struct i2c_client *client)
> +{
> + int rc;
> + uint8_t buf_recv[79];
Why 79? A named constant would be better.
> + int hid_descr_len;
> + int hid_report_len;
> +
> + /*Fetch the length of HID description*/
/* Fetch HID descriptor length */
Note the space after /* and before the trailing */. This applies to
all of your comments.
> + rc = elantech_i2c_command(client, ETP_HID_DESCR_LENGTH_CMD, buf_recv,
> + HID_DES_LENGTH_OFFSET);
> + if (rc != 2)
> + return false;
> + else
else not needed
> + hid_descr_len = buf_recv[0];
> +
> + /*Fetch the lenght of HID report description*/
/* Fetch HID descriptor and parse HID report descriptor form length
from byte 4 */
Why ignore the rest if the HID descriptor?
What does it contain?
I am not familiar with the HID spec. Perhaps this is well defined elsewhere.
> + rc = elantech_i2c_command(client, ETP_HID_DESCR_CMD, buf_recv, hid_descr_len);
> + if (rc != 2)
> + return false;
> + else
else not needed
> + hid_report_len = buf_recv[4];
> +
> + rc = elantech_i2c_command(client, ETP_HID_WAKE_UP_CMD, buf_recv, 0);
> + if (rc != 1)
> + return false;
> +
> + rc = elantech_i2c_command(client, ETP_HID_RESET_CMD, buf_recv, 0);
> + if (rc != 1)
> + return false;
> +
> + msleep(ETP_I2C_COMMAND_DELAY);
It is generally not a good idea to put a 500 ms msleep in the middle
of a driver probe. This directly affects boot time.
The rest of this initialization should be done in a workqueue in
response to the interrupt that should occur after reset (according to
the HID-I2C doc that you referenced).
> + rc = i2c_master_recv(client, buf_recv, 2);
> + if (rc != 2 || (buf_recv[0] != 0 && buf_recv[1] != 0))
> + return false;
> +
> + rc = elantech_i2c_command(client, ETP_HID_REPORT_DESCR_CMD, buf_recv,
> + hid_report_len);
> + if (rc != 2)
> + return false;
> +
> + return true;
> +}
> +
> +static void elantech_i2c_report_absolute(struct elantech_i2c *touch,
> + uint8_t *buf)
> +{
> + unsigned char *packet = buf;
Why do you need a separate variable?
> + unsigned char *finger_data;
uint8_t *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
> + struct input_dev *input = touch->input;
> + int finger_status[5];
bool finger_status;
No need for an array
> + int i;
> + int position_x, position_y;
> + int mky_value, mkx_value, h_value;
> +
> + dyn_data_i = 0;
> + for (i = 0 ; i < ETP_MAX_FINGERS ; i++) {
> + finger_status[i] = (packet[3] >> (3+i)) & 0x01;
> + if (finger_status[i]) {
> + position_x = ((finger_data[0] & 0xf0) << 4) | finger_data[1];
> + position_y = touch->max_y -
> + (((finger_data[0] & 0x0f) << 8) | finger_data[2]);
> + mkx_value = (finger_data[3] & 0x0f) * touch->width_x;
> + mky_value = (finger_data[3] >> 4) * touch->width_y;
> + h_value = finger_data[4];
finger_data += ETP_FINGER_DATA_LEN;
> + input_mt_slot(input, i);
> + input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
> +
> + input_report_abs(input, ABS_MT_POSITION_X, position_x);
> + input_report_abs(input, ABS_MT_POSITION_Y, position_y);
> + input_report_abs(input, ABS_MT_PRESSURE, h_value);
> + input_report_abs(input, ABS_MT_TOUCH_MAJOR, mkx_value);
> + input_report_abs(input, ABS_MT_TOUCH_MINOR, mky_value);
> + } else if (finger_status[i] == 0) {
} else {
> + input_mt_slot(input, i);
> + input_mt_report_slot_state(input, MT_TOOL_FINGER, false);
> + }
> + }
> + input_report_key(input, BTN_LEFT, ((packet[3] & 0x01) == 1));
> + input_report_key(input, BTN_RIGHT, ((packet[3] & 0x02) == 2));
> + input_report_key(input, BTN_MIDDLE, ((packet[3] & 0x04) == 4));
> + input_mt_report_pointer_emulation(input, true);
> + input_sync(input);
> +}
> +
> +static irqreturn_t elantech_i2c_isr(int irq, void *dev_id)
> +{
> + struct elantech_i2c *elantech_i2c_priv = dev_id;
> + unsigned char buf_recv[30] = {0};
uint8_t buf_recv[ETP_PACKET_LENGTH];
> + int rc;
> + int length;
> +
> + rc = i2c_master_recv(elantech_i2c_priv->client, buf_recv, ETP_PACKET_LENGTH);
if (rc != ETP_PACKET_LENGTH)
goto elantech_isr_end;
...
> + if (rc == ETP_PACKET_LENGTH) {
> + length = (buf_recv[1] << 8) | buf_recv[0];
If you are sanity checking the packet, perhaps you should check this
length, too?
> + if (!memcmp(elantech_i2c_priv->pre_recv, buf_recv, length))
> + goto elantech_isr_end;
Why are you checking that the packet is the same as before and exiting if it is?
Let the evdev layer handle event compression.
> +
> + memcpy(elantech_i2c_priv->pre_recv, buf_recv, length);
> + /*Packet check*/
> + if (buf_recv[2] == ETP_REPORT_ID && buf_recv[length - 1] == 0x00)
> + elantech_i2c_report_absolute(elantech_i2c_priv, buf_recv);
> + else if (elan_i2c_debug)
> + print_hex_dump_bytes("Elan I2C Touch data :",
> + DUMP_PREFIX_NONE, buf_recv, length);
> + }
> +
> +elantech_isr_end:
> + return IRQ_HANDLED;
> +}
> +
> +static struct elantech_i2c *elantech_i2c_priv_create(struct i2c_client *client)
> +{
> + struct elantech_i2c *elantech_i2c_priv;
> + struct input_dev *dev;
> + unsigned int gpio;
> + const char *label = "elantech_i2c";
> + int rc = 0;
> + int Pressure_value_data;
use lower case pressure
> + unsigned char buf_recv[2];
> +
> + elantech_i2c_priv = kzalloc(sizeof(struct elantech_i2c), GFP_KERNEL);
> + if (!elantech_i2c_priv)
> + return NULL;
> +
> + elantech_i2c_priv->client = client;
> + elantech_i2c_priv->irq = client->irq;
> + elantech_i2c_priv->input = input_allocate_device();
> + if (elantech_i2c_priv->input == NULL)
> + goto err_input_allocate_device;
> +
> + elantech_i2c_priv->input->name = "ELANTECH_I2C";
> + elantech_i2c_priv->input->phys = client->adapter->name;
> + elantech_i2c_priv->input->id.bustype = BUS_I2C;
> +
> + dev = elantech_i2c_priv->input;
> + __set_bit(EV_KEY, dev->evbit);
> + __set_bit(EV_ABS, dev->evbit);
> +
> + __set_bit(BTN_LEFT, dev->keybit);
> + __set_bit(BTN_RIGHT, dev->keybit);
> + __set_bit(BTN_MIDDLE, dev->keybit);
> +
> + __set_bit(BTN_TOUCH, dev->keybit);
> + __set_bit(BTN_TOOL_FINGER, dev->keybit);
> + __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
> + __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
> + __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
> +
> + elantech_i2c_command(client, ETP_X_AXIS_MAX_CMD, buf_recv, ETP_INF_LENGTH);
> + elantech_i2c_priv->max_x = (0x0f & buf_recv[1]) << 8 | buf_recv[0];
> + elantech_i2c_command(client, ETP_Y_AXIS_MAX_CMD, buf_recv, ETP_INF_LENGTH);
> + elantech_i2c_priv->max_y = (0x0f & buf_recv[1]) << 8 | buf_recv[0];
> + printk(KERN_INFO "%s max_x = %d\n", __func__, elantech_i2c_priv->max_x);
dev_info()
> + printk(KERN_INFO "%s max_y = %d\n", __func__, elantech_i2c_priv->max_y);
> + elantech_i2c_command(client, ETP_TRACE_NUM_CMD, buf_recv, ETP_INF_LENGTH);
> + elantech_i2c_priv->width_x = elantech_i2c_priv->max_x / (buf_recv[0] - 1);
> + elantech_i2c_priv->width_y = elantech_i2c_priv->max_y / (buf_recv[1] - 1);
> + Pressure_value_data = 0xff;
> +
> + /* X Y Value*/
> + input_set_abs_params(dev, ABS_X, 0, elantech_i2c_priv->max_x, 0, 0);
> + input_set_abs_params(dev, ABS_Y, 0, elantech_i2c_priv->max_y, 0, 0);
> + /* Palme Value */
> + input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
> +
> + /* Finger Pressure value */
> + input_set_abs_params(dev, ABS_TOOL_WIDTH, 0, Pressure_value_data, 0, 0);
> +
> + /* Finger Pressure value */
> + input_mt_init_slots(dev, ETP_MAX_FINGERS);
> + input_set_abs_params(dev, ABS_MT_POSITION_X, 0, elantech_i2c_priv->max_x, 0, 0);
> + input_set_abs_params(dev, ABS_MT_POSITION_Y, 0, elantech_i2c_priv->max_y, 0, 0);
> + input_set_abs_params(dev, ABS_MT_PRESSURE, 0, Pressure_value_data, 0, 0);
> + input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0, Pressure_value_data, 0, 0);
> + input_set_abs_params(dev, ABS_MT_TOUCH_MINOR, 0, Pressure_value_data, 0, 0);
> +
> + /* Enable ABS mode*/
> + elantech_i2c_command(client, ETP_ENABLE_ABS_CMD, buf_recv, ETP_INF_LENGTH);
> + gpio = irq_to_gpio(client->irq);
> + rc = gpio_request(gpio, label);
> + if (rc < 0) {
> + dev_dbg(&client->dev, "gpio_request failed for input %d rc = %d\n", gpio, rc);
> + goto err_gpio_request;
> + }
> + rc = gpio_direction_input(gpio);
> + if (rc < 0) {
> + dev_dbg(&client->dev, "gpio_direction_input failed for input %d\n", gpio);
> + goto err_gpio_request;
> + }
> + elantech_i2c_priv->gpio = gpio;
> + rc = request_threaded_irq(client->irq, NULL, elantech_i2c_isr,
> + IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> + client->name, elantech_i2c_priv);
> + if (rc < 0) {
> + dev_dbg(&client->dev, "Could not register for %s interrupt, irq = %d, rc = %d\n",
> + label, client->irq, rc);
> + goto err_gpio_request_irq_fail;
> + }
> +
> + return elantech_i2c_priv;
> +
> +err_gpio_request_irq_fail:
> + gpio_free(gpio);
> +err_gpio_request:
> + input_free_device(elantech_i2c_priv->input);
> +err_input_allocate_device:
if you get here via the goto err_input_allocate_device,
elantech_i2c_priv is already NULL so you don't need to free it.
> + kfree(elantech_i2c_priv);
> + return NULL;
> +}
> +
> +static int elantech_i2c_probe(struct i2c_client *client,
> + const struct i2c_device_id *dev_id)
> +
> +{
> + int ret = 0;
> + struct elantech_i2c *elantech_i2c_priv;
> + unsigned int gpio;
> +
> + if (!elantech_i2c_hw_init(client)) {
> + ret = -EINVAL;
> + goto err_hw_init;
> + }
> + elantech_i2c_priv = elantech_i2c_priv_create(client);
> + if (!elantech_i2c_priv) {
> + ret = -EINVAL;
> + goto err_elantech_i2c_priv;
> + }
> +
> + ret = input_register_device(elantech_i2c_priv->input);
> + if (ret < 0)
> + goto err_input_register_device;
> +
> + i2c_set_clientdata(client, elantech_i2c_priv);
> + device_init_wakeup(&client->dev, 1);
> +
> + return 0;
> +
> +err_input_register_device:
> + gpio = elantech_i2c_priv->gpio;
> + gpio_free(gpio);
> + free_irq(elantech_i2c_priv->irq, elantech_i2c_priv);
> + input_free_device(elantech_i2c_priv->input);
> + kfree(elantech_i2c_priv);
> +err_elantech_i2c_priv:
Remove redundant label.
> +err_hw_init:
> + return ret;
> +}
> +
> +static int elantech_i2c_remove(struct i2c_client *client)
> +{
> + struct elantech_i2c *elantech_i2c_priv = i2c_get_clientdata(client);
> +
> + if (elantech_i2c_priv) {
> + if (elantech_i2c_priv->gpio > 0)
> + gpio_free(elantech_i2c_priv->gpio);
> + free_irq(elantech_i2c_priv->irq, elantech_i2c_priv);
> + input_unregister_device(elantech_i2c_priv->input);
> + kfree(elantech_i2c_priv);
> + }
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int elantech_i2c_suspend(struct device *dev)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> +
> + if (device_may_wakeup(&client->dev))
> + enable_irq_wake(client->irq);
> +
> + return 0;
> +}
> +
> +static int elantech_i2c_resume(struct device *dev)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> +
> + if (device_may_wakeup(&client->dev))
> + enable_irq_wake(client->irq);
> +
> + return 0;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(elan_i2c_touchpad_pm_ops,
> + elantech_i2c_suspend, elantech_i2c_resume);
> +
> +static const struct i2c_device_id elantech_i2c_id_table[] = {
> + { "elantech_i2c", 0 },
> + { },
> +};
> +MODULE_DEVICE_TABLE(i2c, elantech_i2c_id_table);
> +
> +static struct i2c_driver elantech_i2c_driver = {
> + .driver = {
> + .name = DRIVER_NAME,
> + .owner = THIS_MODULE,
> + .pm = &elan_i2c_touchpad_pm_ops,
> + },
> + .probe = elantech_i2c_probe,
> + .remove = __devexit_p(elantech_i2c_remove),
> + .id_table = elantech_i2c_id_table,
> +};
> +
> +static int __init elantech_i2c_init(void)
> +{
> + return i2c_add_driver(&elantech_i2c_driver);
> +}
> +
> +static void __exit elantech_i2c_exit(void)
> +{
> + i2c_del_driver(&elantech_i2c_driver);
> +}
> +
> +module_init(elantech_i2c_init);
> +module_exit(elantech_i2c_exit);
> +
> +MODULE_AUTHOR("Tom Lin (Lin Yen Yu) <tom_lin@....com.tw>");
> +MODULE_DESCRIPTION("Elan I2C Touch Pad driver");
> +MODULE_LICENSE("GPL");
> --
> 1.7.9.2
>
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