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Message-ID: <20131216210011.GC8884@core.coreip.homeip.net>
Date: Mon, 16 Dec 2013 13:00:11 -0800
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Duson Lin <dusonlin@....com.tw>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
agnescheng@...gle.com, phoenix@....com.tw
Subject: Re: [PATCH] Input: add i2c/smbus driver for elan touchpad
Hi Duson,
On Fri, Nov 22, 2013 at 01:56:55PM +0800, Duson Lin wrote:
> This driver adds support for elan i2c/smbus touchpad found on some laptops PC
> ---
> drivers/input/mouse/Kconfig | 10 +
> drivers/input/mouse/Makefile | 1 +
> drivers/input/mouse/elan_i2c.c | 1846 ++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 1857 insertions(+)
> create mode 100644 drivers/input/mouse/elan_i2c.c
>
> diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
> index effa9c5..8ad4b38 100644
> --- a/drivers/input/mouse/Kconfig
> +++ b/drivers/input/mouse/Kconfig
> @@ -215,6 +215,16 @@ config MOUSE_CYAPA
> To compile this driver as a module, choose M here: the module will be
> called cyapa.
>
> +config MOUSE_ELAN_I2C
> + tristate "ELAN I2C Touchpad support"
> + depends on I2C
> + help
> + This driver adds support for Elan I2C Trackpads.
> + Say y here if you have a ELAN I2C Touchpad.
> +
> + To compile this driver as a module, choose M here: the module will be
> + called elan_i2c.
> +
> config MOUSE_INPORT
> tristate "InPort/MS/ATIXL busmouse"
> depends on ISA
> diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
> index c25efdb..24a12a6 100644
> --- a/drivers/input/mouse/Makefile
> +++ b/drivers/input/mouse/Makefile
> @@ -9,6 +9,7 @@ obj-$(CONFIG_MOUSE_APPLETOUCH) += appletouch.o
> obj-$(CONFIG_MOUSE_ATARI) += atarimouse.o
> obj-$(CONFIG_MOUSE_BCM5974) += bcm5974.o
> obj-$(CONFIG_MOUSE_CYAPA) += cyapa.o
> +obj-$(CONFIG_MOUSE_ELAN_I2C) += elan_i2c.o
> obj-$(CONFIG_MOUSE_GPIO) += gpio_mouse.o
> obj-$(CONFIG_MOUSE_INPORT) += inport.o
> obj-$(CONFIG_MOUSE_LOGIBM) += logibm.o
> diff --git a/drivers/input/mouse/elan_i2c.c b/drivers/input/mouse/elan_i2c.c
> new file mode 100644
> index 0000000..9892ee1
> --- /dev/null
> +++ b/drivers/input/mouse/elan_i2c.c
> @@ -0,0 +1,1846 @@
> +/*
> + * Elan I2C/SMBus Touchpad driver
> + *
> + * Copyright (c) 2013 ELAN Microelectronics Corp.
> + *
> + * Author: 林政維 (Duson Lin) <dusonlin@....com.tw>
> + * Version: 1.4.6
> + *
> + * 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/firmware.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/input/mt.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/debugfs.h>
> +#include <linux/cdev.h>
> +#include <linux/kernel.h>
> +#include <linux/major.h>
> +#include <linux/sched.h>
> +#include <linux/input.h>
> +#include <linux/uaccess.h>
> +#include <linux/jiffies.h>
> +
> +#define DRIVER_NAME "elan_i2c"
> +#define ELAN_DRIVER_VERSION "1.4.6"
> +#define ETP_PRESSURE_OFFSET 25
> +#define ETP_MAX_PRESSURE 255
> +#define ETP_FWIDTH_REDUCE 90
> +#define ETP_FINGER_WIDTH 15
> +
> +#define ELAN_ADAPTER_FUNC_NONE 0
> +#define ELAN_ADAPTER_FUNC_I2C 1
> +#define ELAN_ADAPTER_FUNC_SMBUS 2
> +#define ELAN_ADAPTER_FUNC_BOTH 3
> +
> +/* Length of Elan touchpad information */
> +#define ETP_INF_LENGTH 2
> +#define ETP_MAX_FINGERS 5
> +#define ETP_FINGER_DATA_LEN 5
> +#define ETP_REPORT_ID 0x5D
> +#define ETP_MAX_REPORT_LEN 34
> +#define ETP_ENABLE_ABS 0x0001
> +#define ETP_ENABLE_CALIBRATE 0x0002
> +#define ETP_DISABLE_CALIBRATE 0x0000
> +
> +/* Elan smbus command */
> +#define ETP_SMBUS_IAP_CMD 0x00
> +#define ETP_SMBUS_ENABLE_TP 0x20
> +#define ETP_SMBUS_DISABLE_TP 0x21
> +#define ETP_SMBUS_IAP_PASSWORD_WRITE 0x29
> +#define ETP_SMBUS_IAP_PASSWORD_READ 0x80
> +#define ETP_SMBUS_WRITE_FW_BLOCK 0x2A
> +#define ETP_SMBUS_IAP_RESET_CMD 0x2B
> +#define ETP_SMBUS_RANGE_CMD 0xA0
> +#define ETP_SMBUS_FW_VERSION_CMD 0xA1
> +#define ETP_SMBUS_XY_TRACENUM_CMD 0xA2
> +#define ETP_SMBUS_SM_VERSION_CMD 0xA3
> +#define ETP_SMBUS_UNIQUEID_CMD 0xA3
> +#define ETP_SMBUS_RESOLUTION_CMD 0xA4
> +#define ETP_SMBUS_HELLOPACKET_CMD 0xA7
> +#define ETP_SMBUS_PACKET_QUERY 0xA8
> +#define ETP_SMBUS_IAP_VERSION_CMD 0xAC
> +#define ETP_SMBUS_IAP_CTRL_CMD 0xAD
> +#define ETP_SMBUS_IAP_CHECKSUM_CMD 0xAE
> +#define ETP_SMBUS_FW_CHECKSUM_CMD 0xAF
> +#define ETP_SMBUS_MAX_BASELINE_CMD 0xC3
> +#define ETP_SMBUS_MIN_BASELINE_CMD 0xC4
> +#define ETP_SMBUS_CALIBRATE_QUERY 0xC5
> +#define ETP_SMBUS_REPORT_LEN 32
> +#define ETP_SMBUS_FINGER_DATA_OFFSET 2
> +#define ETP_SMBUS_HELLOPACKET_LEN 5
> +#define ETP_SMBUS_IAP_PASSWORD 0x1234
> +#define ETP_SMBUS_IAP_MODE_ON (1<<6)
> +
> +/* Elan i2c command */
> +#define ETP_I2C_RESET 0x0100
> +#define ETP_I2C_WAKE_UP 0x0800
> +#define ETP_I2C_SLEEP 0x0801
> +#define ETP_I2C_DESC_CMD 0x0001
> +#define ETP_I2C_REPORT_DESC_CMD 0x0002
> +#define ETP_I2C_STAND_CMD 0x0005
> +#define ETP_I2C_UNIQUEID_CMD 0x0101
> +#define ETP_I2C_FW_VERSION_CMD 0x0102
> +#define ETP_I2C_SM_VERSION_CMD 0x0103
> +#define ETP_I2C_XY_TRACENUM_CMD 0x0105
> +#define ETP_I2C_MAX_X_AXIS_CMD 0x0106
> +#define ETP_I2C_MAX_Y_AXIS_CMD 0x0107
> +#define ETP_I2C_RESOLUTION_CMD 0x0108
> +#define ETP_I2C_IAP_VERSION_CMD 0x0110
> +#define ETP_I2C_SET_CMD 0x0300
> +#define ETP_I2C_MAX_BASELINE_CMD 0x0306
> +#define ETP_I2C_MIN_BASELINE_CMD 0x0307
> +#define ETP_I2C_FW_CHECKSUM_CMD 0x030F
> +#define ETP_I2C_IAP_CTRL_CMD 0x0310
> +#define ETP_I2C_IAP_CMD 0x0311
> +#define ETP_I2C_IAP_RESET_CMD 0x0314
> +#define ETP_I2C_IAP_CHECKSUM_CMD 0x0315
> +#define ETP_I2C_CALIBRATE_CMD 0x0316
> +#define ETP_I2C_REPORT_LEN 34
> +#define ETP_I2C_FINGER_DATA_OFFSET 4
> +#define ETP_I2C_REPORT_ID_OFFSET 2
> +#define ETP_I2C_DESC_LENGTH 30
> +#define ETP_I2C_REPORT_DESC_LENGTH 158
> +#define ETP_I2C_IAP_PASSWORD 0x1EA5
> +#define ETP_I2C_IAP_RESET 0xF0F0
> +#define ETP_I2C_MAIN_MODE_ON (1<<9)
> +#define ETP_I2C_IAP_REG_L 0x01
> +#define ETP_I2C_IAP_REG_H 0x06
> +
> +/* IAP F/W updater */
> +#define ETP_FW_NAME "elan_i2c.bin"
> +#define ETP_IAP_VERSION_ADDR 0x0082
> +#define ETP_IAP_START_ADDR 0x0083
> +#define ETP_FW_IAP_PAGE_ERR (1<<5)
> +#define ETP_FW_IAP_INTERFACE_ERR (1<<4)
> +#define ETP_FW_PAGE_SIZE 64
> +#define ETP_FW_PAGE_COUNT 768
> +#define ETP_FW_SIZE (ETP_FW_PAGE_SIZE * ETP_FW_PAGE_COUNT)
> +enum {UNKNOWN_MODE, IAP_MODE, MAIN_MODE};
> +
> +struct dbfs_data {
> + bool bfetch;
> + u8 buffer[ETP_MAX_REPORT_LEN];
> +};
> +
> +/* The main device structure */
> +struct elan_tp_data {
> + struct i2c_client *client;
> + struct input_dev *input;
> + unsigned int max_x;
> + unsigned int max_y;
> + unsigned int width_x;
> + unsigned int width_y;
> + unsigned int irq;
> +
> + /* fields required for IAP firmware updater */
> + u16 unique_id;
> + u16 fw_version;
> + u16 sm_version;
> + u16 iap_version;
> + bool updated_fw;
> + u16 iap_start_addr;
> +
> + /* irq wake is enabled */
> + bool irq_wake;
> + bool smbus;
> + bool enable_detail_info;
> +
> + /* fields required for debug fs */
> + struct mutex dbfs_mutex;
> + struct dentry *dbfs_root;
> + struct dbfs_data dbfs_buffer;
> +};
> +
> +u8 val[256];
> +static int elan_i2c_read_cmd(struct i2c_client *client, u16 reg, u8 *val);
> +static int elan_i2c_write_cmd(struct i2c_client *client, u16 reg, u16 cmd);
> +static int elan_initialize(struct elan_tp_data *data);
> +
> +/*
> + **************************************************************
> + * debugfs interface
> + **************************************************************
> +*/
> +static int elan_dbfs_open(struct inode *inode, struct file *file)
> +{
> + int retval;
> + struct elan_tp_data *data = inode->i_private;
> +
> + if (!data)
> + return -ENODEV;
> +
> + retval = mutex_lock_interruptible(&data->dbfs_mutex);
> + if (retval)
> + return retval;
> +
> + if (!kobject_get(&data->client->dev.kobj)) {
Why are you pinning I2C device kobject? It will not prevent unbinding
the driver if that's what you are aiming for.
> + retval = -ENODEV;
> + goto dbfs_out;
> + }
> +
> + file->private_data = data;
> +dbfs_out:
> + mutex_unlock(&data->dbfs_mutex);
> + return 0;
> +}
> +
> +static int elan_dbfs_release(struct inode *inode, struct file *file)
> +{
> + struct elan_tp_data *data = file->private_data;
> + int retval;
> + if (!data)
> + return -ENODEV;
> +
> + retval = mutex_lock_interruptible(&data->dbfs_mutex);
> + if (retval)
> + return retval;
> + file->private_data = NULL;
> + kobject_put(&data->client->dev.kobj);
> + mutex_unlock(&data->dbfs_mutex);
> + return 0;
> +}
> +
> +
> +static ssize_t elan_dbfs_read(struct file *file,
> + char __user *buffer, size_t count, loff_t *ppos)
> +{
> + struct elan_tp_data *data = file->private_data;
> + int retval;
> + if (!data)
> + return -ENODEV;
> +
> + retval = mutex_lock_interruptible(&data->dbfs_mutex);
> + if (retval)
> + return -EFAULT;
> + if (data->dbfs_buffer.bfetch == false) {
> + if (!copy_to_user(buffer, data->dbfs_buffer.buffer, count)) {
> + data->dbfs_buffer.bfetch = true;
> + retval = count;
> + } else {
> + retval = -2;
-ENOENT? Why?
> + }
> + } else {
> + retval = -4;
-EINTR???
> + }
> + mutex_unlock(&data->dbfs_mutex);
> + return retval;
> +}
> +
> +static ssize_t elan_dbfs_write(struct file *file,
> + const char __user *buffer, size_t count, loff_t *ppos)
> +{
> + struct elan_tp_data *data = file->private_data;
> + int retval;
> + if (!data)
> + return -ENODEV;
> +
> + retval = mutex_lock_interruptible(&data->dbfs_mutex);
> + if (retval)
> + return -EFAULT;
> + retval = count;
> + mutex_unlock(&data->dbfs_mutex);
> + return retval;
> +}
This looks like an unneeded stub.
> +
> +static long elan_dbfs_ioctrl(struct file *file,
> + unsigned int cmd, unsigned long arg)
> +{
> + int retval = 0;
> + struct elan_tp_data *data = file->private_data;
> +
> + retval = mutex_lock_interruptible(&data->dbfs_mutex);
> + if (retval)
> + return retval;
> + mutex_unlock(&data->dbfs_mutex);
> + return retval;
> +}
Same here.
> +
> +static const struct file_operations elan_debug_fops = {
> + .open = elan_dbfs_open,
> + .release = elan_dbfs_release,
> + .read = elan_dbfs_read,
> + .write = elan_dbfs_write,
> + .unlocked_ioctl = elan_dbfs_ioctrl
> +};
> +
> +static int elan_dbfs_init(struct elan_tp_data *data)
> +{
> + /* Create a global debugfs root for all elan devices */
> + /* sys/kernel/debug/elan */
> + data->dbfs_root = debugfs_create_dir("elan", NULL);
> + if (!data->dbfs_root) {
> + dev_err(&data->client->dev, "cannot create dbfs_root.\n");
> + return -ENODEV;
> + }
That should not be done in per-device code. That said, do you really
need to dump your packets - looks like you are done with the driver
development?
> + mutex_init(&data->dbfs_mutex);
> +
> + debugfs_create_file(DRIVER_NAME, 0777,
> + data->dbfs_root, data, &elan_debug_fops);
> + data->dbfs_buffer.bfetch = false;
> + return 0;
> +}
> +
> +/**********************************************************
> + * IAP firmware updater related routines *
> + **********************************************************
> +*/
> +
> +static int elan_iap_getmode(struct elan_tp_data *data)
> +{
> + u16 constant;
> + int retval;
> + struct i2c_client *client = data->client;
> +
> + if (data->smbus) {
> + retval = i2c_smbus_read_block_data(client,
> + ETP_SMBUS_IAP_CTRL_CMD, val);
> + if (retval < 0) {
> + dev_err(&client->dev, "read iap ctrol fail.\n");
> + return UNKNOWN_MODE;
> + }
> + constant = be16_to_cpup((__be16 *)val);
> + dev_dbg(&client->dev, "smbus iap control reg: 0x%04x.\n",
> + constant);
> + if ((constant & ETP_SMBUS_IAP_MODE_ON) == 0x00)
> + return MAIN_MODE;
> + } else {
> + retval = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
> + if (retval < 0) {
> + dev_err(&client->dev, "read iap ctrol fail.\n");
> + return UNKNOWN_MODE;
> + }
> + constant = le16_to_cpup((__le16 *)val);
> + dev_dbg(&client->dev, "i2c iap control reg: 0x%04x.\n",
> + constant);
> + if (constant & ETP_I2C_MAIN_MODE_ON)
> + return MAIN_MODE;
> + }
Instead of doing
if (smbus)
do_this();
else
do_that();
everywhere maybe you could define transport functions and invoke them
through a pointer to transport ops?
> +
> + return IAP_MODE;
> +}
> +
> +static int elan_iap_checksum(struct elan_tp_data *data)
> +{
> + int retval = 0;
> + u16 checksum = -1;
> + struct i2c_client *client = data->client;
> +
> + if (data->smbus) {
> + retval = i2c_smbus_read_block_data(client,
> + ETP_SMBUS_IAP_CHECKSUM_CMD, val);
> + if (retval < 0) {
> + dev_err(&client->dev, "Read checksum fail, %d\n",
> + retval);
> + return -1;
> + }
> + checksum = be16_to_cpup((__be16 *)val);
> + } else {
> + retval = elan_i2c_read_cmd(client,
> + ETP_I2C_IAP_CHECKSUM_CMD, val);
> + if (retval < 0) {
> + dev_err(&client->dev, "Read checksum fail, %d\n",
> + retval);
> + return -1;
> + }
> + checksum = le16_to_cpup((__le16 *)val);
> + }
> + return checksum;
> +}
> +
> +static bool elan_iap_reset(struct elan_tp_data *data)
> +{
> + int retval = 0;
> + struct i2c_client *client = data->client;
> +
> + if (data->smbus)
> + retval = i2c_smbus_write_byte(client,
> + ETP_SMBUS_IAP_RESET_CMD);
> + else
> + retval = elan_i2c_write_cmd(client, ETP_I2C_IAP_RESET_CMD,
> + ETP_I2C_IAP_RESET);
> + if (retval < 0) {
> + dev_err(&client->dev, "cannot reset IC, %d\n", retval);
> + return false;
> + }
> + return true;
> +}
> +
> +static bool elan_iap_setflashkey(struct elan_tp_data *data)
> +{
> + int retval = 0;
> + struct i2c_client *client = data->client;
> + u8 smbus_cmd[4] = {0x00, 0x0B, 0x00, 0x5A};
> +
> + if (data->smbus)
> + retval = i2c_smbus_write_block_data(client,
> + ETP_SMBUS_IAP_CMD, 4, smbus_cmd);
> + else
> + retval = elan_i2c_write_cmd(client, ETP_I2C_IAP_CMD,
> + ETP_I2C_IAP_PASSWORD);
> + if (retval < 0) {
> + dev_err(&client->dev, "cannot set flash key, %d\n", retval);
> + return false;
> + }
> +
> + return true;
> +}
> +
> +static int elan_check_fw(struct elan_tp_data *data,
> + const struct firmware *fw)
> +{
> + struct device *dev = &data->client->dev;
> +
> + /* Firmware must match exact PAGE_NUM * PAGE_SIZE bytes */
> + if (fw->size != ETP_FW_SIZE) {
> + dev_err(dev, "invalid firmware size = %zu, expected %d.\n",
> + fw->size, ETP_FW_SIZE);
> + return -EBADF;
> + }
> +
> + /* Get IAP Start Address*/
> + memcpy(val, &fw->data[ETP_IAP_START_ADDR * 2], 2);
> + data->iap_start_addr = le16_to_cpup((__le16 *)val);
> + return 0;
> +}
> +
> +
> +static int elan_smbus_prepare_fw_update(struct elan_tp_data *data)
> +{
> + struct i2c_client *client = data->client;
> + struct device *dev = &data->client->dev;
> + u16 password;
> + u8 cmd[4] = {0x0F, 0x78, 0x00, 0x06};
> +
> + /* Get FW in which mode (IAP_MODE/MAIN_MODE) */
> + int mode = elan_iap_getmode(data);
> + if (mode == UNKNOWN_MODE)
> + return -1;
> +
> + if (mode == MAIN_MODE) {
> +
> + /* set flash key*/
> + if (elan_iap_setflashkey(data) == false) {
> + dev_err(dev, "cannot set flash key\n");
> + return -1;
> + }
> +
> + /* write iap password */
> + if (i2c_smbus_write_byte(client,
> + ETP_SMBUS_IAP_PASSWORD_WRITE) < 0) {
> + dev_err(dev, "cannot write iap password\n");
> + return -1;
Would be nice using appropriate error codes. EIO?
> + }
> +
> + if (i2c_smbus_write_block_data(client,
> + ETP_SMBUS_IAP_CMD, 4, cmd) < 0) {
> + dev_err(dev, "cannot write cmd\n");
> + return -1;
> + }
> +
> + /* read password to check we enabled successfully. */
> + if (i2c_smbus_read_block_data(client,
> + ETP_SMBUS_IAP_PASSWORD_READ, val) < 0) {
> + dev_err(dev, "cannot get iap password\n");
> + return -1;
> + }
> + password = be16_to_cpup((__be16 *)val);
> +
> + if (password != ETP_SMBUS_IAP_PASSWORD) {
> + dev_err(dev, "wrong iap password = 0x%X\n", password);
> + return -1;
> + }
> + /* wait 30ms, from MAIN_MODE change to IAP_MODE*/
> + msleep(30);
> + }
> +
> + /* set flash key*/
> + if (elan_iap_setflashkey(data) == false) {
> + dev_err(dev, "cannot set flash key\n");
> + return -1;
> + }
> +
> + /* Reset IC */
> + if (elan_iap_reset(data) == false) {
> + dev_err(dev, "iap reset fail.\n");
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +static int elan_i2c_prepare_fw_update(struct elan_tp_data *data)
> +{
> + struct i2c_client *client = data->client;
> + struct device *dev = &data->client->dev;
> + u16 password;
> +
> + /* Get FW in which mode (IAP_MODE/MAIN_MODE) */
> + int mode = elan_iap_getmode(data);
> + if (mode == UNKNOWN_MODE)
> + return -1;
> +
> + if (mode == IAP_MODE) {
> + /* Reset IC */
> + if (elan_iap_reset(data) == false)
> + return -1;
> + msleep(30);
> + }
> +
> + /* set flash key*/
> + if (elan_iap_setflashkey(data) == false) {
> + dev_err(dev, "cannot set flash key\n");
> + return -1;
> + }
> +
> + /* Wait for F/W IAP initialization */
> + if (mode == MAIN_MODE)
> + msleep(100);
> + else
> + msleep(30);
> +
> + /* check is in iap mode or not*/
> + if (elan_iap_getmode(data) == MAIN_MODE) {
> + dev_err(dev, "status wrong.\n");
> + return -1;
> + }
> +
> + /* set flash key again */
> + if (elan_iap_setflashkey(data) == false) {
> + dev_err(dev, "cannot set flash key\n");
> + return -1;
> + }
> +
> + /* Wait for F/W IAP initialization */
> + if (mode == MAIN_MODE)
> + msleep(100);
> + else
> + msleep(30);
> +
> + /* read back to check we actually enabled successfully. */
> + if (elan_i2c_read_cmd(client, ETP_I2C_IAP_CMD, val) < 0) {
> + dev_err(dev, "cannot get iap register\n");
> + return -1;
> + }
> + password = le16_to_cpup((__le16 *)val);
> +
> + if (password != ETP_I2C_IAP_PASSWORD) {
> + dev_err(dev, "wrong iap password = 0x%X\n", password);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static bool elan_iap_page_write_ok(struct elan_tp_data *data)
> +{
> + u16 constant;
> + int retval = 0;
> + struct i2c_client *client = data->client;
> +
> +
> + if (data->smbus) {
> + retval = i2c_smbus_read_block_data(client,
> + ETP_SMBUS_IAP_CTRL_CMD, val);
> + if (retval < 0)
> + return false;
> + constant = be16_to_cpup((__be16 *)val);
> + } else {
> + retval = elan_i2c_read_cmd(client,
> + ETP_I2C_IAP_CTRL_CMD, val);
> + if (retval < 0)
> + return false;
> + constant = le16_to_cpup((__le16 *)val);
> + }
> +
> + if (constant & ETP_FW_IAP_PAGE_ERR)
> + return false;
> +
> + if (constant & ETP_FW_IAP_INTERFACE_ERR)
> + return false;
> + return true;
> +}
> +
> +static int elan_smbus_write_fw_block(struct elan_tp_data *data,
> + const u8 *page, u16 checksum, int idx)
> +{
> + struct device *dev = &data->client->dev;
> + int half_page_size = ETP_FW_PAGE_SIZE / 2;
> + int repeat = 3;
> +
> + do {
> + /* due to smbus can write 32 bytes one time,
> + so, we must write data 2 times.
> + */
> + i2c_smbus_write_block_data(data->client,
> + ETP_SMBUS_WRITE_FW_BLOCK,
> + half_page_size,
> + page);
> + i2c_smbus_write_block_data(data->client,
> + ETP_SMBUS_WRITE_FW_BLOCK,
> + half_page_size,
> + (page + half_page_size));
> + /* Wait for F/W to update one page ROM data. */
> + usleep_range(8000, 10000);
> + if (elan_iap_page_write_ok(data))
> + break;
> + dev_info(dev, "IAP retry this page! [%d]\n", idx);
> + repeat--;
> + } while (repeat == 0);
> +
> + if (repeat > 0)
> + return 0;
> + return -1;
> +
> +}
> +
> +static int elan_i2c_write_fw_block(struct elan_tp_data *data,
> + const u8 *page, u16 checksum, int idx)
> +{
> + struct device *dev = &data->client->dev;
> + int ret;
> + int repeat = 3;
> + u8 page_store[ETP_FW_PAGE_SIZE + 4];
> +
> + page_store[0] = ETP_I2C_IAP_REG_L;
> + page_store[1] = ETP_I2C_IAP_REG_H;
> + memcpy(&page_store[2], page, ETP_FW_PAGE_SIZE);
> +
> + /* recode checksum at last two bytes */
> + page_store[ETP_FW_PAGE_SIZE+2] = (u8)(checksum & 0xFF);
> + page_store[ETP_FW_PAGE_SIZE+3] = (u8)((checksum >> 8)&0xFF);
> +
> + do {
> + ret = i2c_master_send(data->client, page_store,
> + ETP_FW_PAGE_SIZE + 4);
> +
> + /* Wait for F/W to update one page ROM data. */
> + msleep(20);
> +
> + if (ret == (ETP_FW_PAGE_SIZE + 4)) {
> + if (elan_iap_page_write_ok(data))
> + break;
> + }
> + dev_dbg(dev, "IAP retry this page! [%d]\n", idx);
> + repeat--;
> + } while (repeat == 0);
> +
> + if (repeat > 0)
> + return 0;
> + return -1;
> +}
> +
> +static int elan_write_fw_block(struct elan_tp_data *data,
> + const u8 *page, u16 checksum, int idx)
> +{
> + int ret;
> + if (data->smbus)
> + ret = elan_smbus_write_fw_block(data, page, checksum, idx);
> + else
> + ret = elan_i2c_write_fw_block(data, page, checksum, idx);
> + return ret;
> +}
> +
> +static int elan_prepare_fw_update(struct elan_tp_data *data)
> +{
> + int ret = 0;
> + if (data->smbus)
> + ret = elan_smbus_prepare_fw_update(data);
> + else
> + ret = elan_i2c_prepare_fw_update(data);
> + return ret;
> +}
> +
> +static int elan_firmware(struct elan_tp_data *data)
> +{
> + struct device *dev = &data->client->dev;
> + const struct firmware *fw;
> + const char *fw_name = ETP_FW_NAME;
> + int i, j, ret;
> + u16 boot_page_count;
> + u16 sw_checksum, fw_checksum;
> + data->updated_fw = true;
> +
> + dev_info(dev, "Start firmware update....\n");
> +
> + ret = request_firmware(&fw, ETP_FW_NAME, dev);
> + if (ret) {
> + dev_err(dev, "cannot load firmware from %s, %d\n",
> + fw_name, ret);
> + goto done;
> + }
> + /* check fw data match current iap version */
> + ret = elan_check_fw(data, fw);
> + if (ret) {
> + dev_err(dev, "Invalid Elan firmware from %s, %d\n",
> + fw_name, ret);
> + goto done;
> + }
> + /* setup IAP status */
> + ret = elan_prepare_fw_update(data);
> + if (ret)
> + goto done;
> + sw_checksum = 0;
> + fw_checksum = 0;
> + boot_page_count = (data->iap_start_addr * 2) / ETP_FW_PAGE_SIZE;
> + for (i = boot_page_count; i < ETP_FW_PAGE_COUNT; i++) {
> + u16 checksum = 0;
> + const u8 *page = &fw->data[i * ETP_FW_PAGE_SIZE];
> +
> + for (j = 0; j < ETP_FW_PAGE_SIZE; j += 2)
> + checksum += ((page[j + 1] << 8) | page[j]);
> +
> + ret = elan_write_fw_block(data, page, checksum, i);
> + if (ret) {
> + dev_err(dev, "write page %d fail\n", i);
> + goto done;
> + }
> + sw_checksum += checksum;
> + }
> +
> + /* Wait WDT reset and power on reset */
> + msleep(600);
> +
> + /* check checksum */
> + fw_checksum = elan_iap_checksum(data);
> + if (sw_checksum != fw_checksum) {
> + dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
> + sw_checksum, fw_checksum);
> + ret = -1;
> + goto done;
> + }
> + ret = 0;
> +done:
> + if (ret != 0) {
> + elan_iap_reset(data);
> + data->updated_fw = false;
> + } else {
> + if (data->smbus) {
> + data->updated_fw = false;
> + elan_initialize(data);
> + }
> + }
> + release_firmware(fw);
> + return ret;
> +}
> +
> +/******************************************************************
> +* Elan smbus interface
> +*******************************************************************
> +*/
> +static int elan_smbus_initialize(struct i2c_client *client)
> +{
> + u8 check[ETP_SMBUS_HELLOPACKET_LEN] = {0x55, 0x55, 0x55, 0x55, 0x55};
> + u8 values[ETP_SMBUS_HELLOPACKET_LEN] = {0, 0, 0, 0, 0};
> + int ret;
> +
> + /* Get hello packet */
> + ret = i2c_smbus_read_block_data(client,
> + ETP_SMBUS_HELLOPACKET_CMD, values);
> + if (ret != ETP_SMBUS_HELLOPACKET_LEN) {
> + dev_err(&client->dev, "hello packet length fail\n");
> + return -1;
> + }
> +
> + /* compare hello packet */
> + if (memcmp(values, check, ETP_SMBUS_HELLOPACKET_LEN)) {
> + dev_err(&client->dev, "hello packet fail [%x %x %x %x %x]\n",
> + values[0], values[1], values[2], values[3], values[4]);
> + return -1;
> + }
> +
> + /* enable tp */
> + ret = i2c_smbus_write_byte(client, ETP_SMBUS_ENABLE_TP);
> + return ret;
> +}
> +
> +static int elan_smbus_enable_calibrate(struct i2c_client *client)
> +{
> + u8 cmd[4] = {0x00, 0x07, 0x00, ETP_ENABLE_ABS|ETP_ENABLE_CALIBRATE};
> +
> + return i2c_smbus_write_block_data(client,
> + ETP_SMBUS_IAP_CMD, 4, cmd);
> +}
> +
> +static int elan_smbus_disable_calibrate(struct i2c_client *client)
> +{
> + u8 cmd[4] = {0x00, 0x07, 0x00, ETP_ENABLE_ABS|ETP_DISABLE_CALIBRATE};
> +
> + return i2c_smbus_write_block_data(client,
> + ETP_SMBUS_IAP_CMD, 4, cmd);
> +}
> +
> +static int elan_smbus_enable_absolute_mode(struct i2c_client *client)
> +{
> + u8 cmd[4] = {0x00, 0x07, 0x00, ETP_ENABLE_ABS};
> +
> + return i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD, 4, cmd);
> +}
> +
> +/*****************************************************************
> +* Elan i2c interface
> +******************************************************************
> +*/
> +static int elan_i2c_read_block(struct i2c_client *client,
> + u16 reg, u8 *val, u16 len)
> +{
> + struct i2c_msg msgs[2];
> + u8 buf[2];
> + int ret;
> +
> + buf[0] = reg & 0xff;
> + buf[1] = (reg >> 8) & 0xff;
> +
> + msgs[0].addr = client->addr;
> + msgs[0].flags = client->flags & I2C_M_TEN;
> + msgs[0].len = 2;
> + msgs[0].buf = buf;
> +
> + msgs[1].addr = client->addr;
> + msgs[1].flags = client->flags & I2C_M_TEN;
> + msgs[1].flags |= I2C_M_RD;
> + msgs[1].len = len;
> + msgs[1].buf = val;
> +
> + ret = i2c_transfer(client->adapter, msgs, 2);
> + return ret != 2 ? -EIO : 0;
> +}
> +
> +static int elan_i2c_read_cmd(struct i2c_client *client, u16 reg, u8 *val)
> +{
> + int retval;
> +
> + retval = elan_i2c_read_block(client, reg, val, ETP_INF_LENGTH);
> + if (retval < 0) {
> + dev_err(&client->dev, "reading cmd (0x%04x) fail.\n", reg);
> + return retval;
> + }
> + return 0;
> +}
> +
> +static int elan_i2c_write_cmd(struct i2c_client *client, u16 reg, u16 cmd)
> +{
> + struct i2c_msg msg;
> + u8 buf[4];
> + int ret;
> +
> + buf[0] = reg & 0xff;
> + buf[1] = (reg >> 8) & 0xff;
> + buf[2] = cmd & 0xff;
> + buf[3] = (cmd >> 8) & 0xff;
> +
> + msg.addr = client->addr;
> + msg.flags = client->flags & I2C_M_TEN;
> + msg.len = 4;
> + msg.buf = buf;
> +
> + ret = i2c_transfer(client->adapter, &msg, 1);
> + return ret != 1 ? -EIO : 0;
> +}
> +
> +static int elan_i2c_reset(struct i2c_client *client)
> +{
> + return elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD,
> + ETP_I2C_RESET);
> +}
> +
> +static int elan_i2c_wake_up(struct i2c_client *client)
> +{
> + return elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD,
> + ETP_I2C_WAKE_UP);
> +}
> +
> +static int elan_i2c_sleep(struct i2c_client *client)
> +{
> + return elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD,
> + ETP_I2C_SLEEP);
> +}
> +
> +static int elan_i2c_enable_absolute_mode(struct i2c_client *client)
> +{
> + return elan_i2c_write_cmd(client, ETP_I2C_SET_CMD,
> + ETP_ENABLE_ABS);
> +}
> +
> +static int elan_i2c_enable_calibrate(struct i2c_client *client)
> +{
> + return elan_i2c_write_cmd(client, ETP_I2C_SET_CMD,
> + ETP_ENABLE_ABS|ETP_ENABLE_CALIBRATE);
> +}
> +
> +static int elan_i2c_disable_calibrate(struct i2c_client *client)
> +{
> + return elan_i2c_write_cmd(client, ETP_I2C_SET_CMD,
> + ETP_ENABLE_ABS|ETP_DISABLE_CALIBRATE);
> +}
> +
> +static int elan_i2c_get_desc(struct i2c_client *client, u8 *val)
> +{
> + return elan_i2c_read_block(client, ETP_I2C_DESC_CMD, val,
> + ETP_I2C_DESC_LENGTH);
> +}
> +
> +static int elan_i2c_get_report_desc(struct i2c_client *client, u8 *val)
> +{
> + return elan_i2c_read_block(client, ETP_I2C_REPORT_DESC_CMD,
> + val, ETP_I2C_REPORT_DESC_LENGTH);
> +}
> +
> +static int elan_i2c_initialize(struct i2c_client *client)
> +{
> + struct device *dev = &client->dev;
> + int rc;
> +
> + rc = elan_i2c_reset(client);
> + if (rc < 0) {
> + dev_err(dev, "device reset failed.\n");
> + return -1;
> + }
> +
> + /* wait for get reset return flag */
> + msleep(100);
> + /* get reset return flag 0000 */
> + rc = i2c_master_recv(client, val, ETP_INF_LENGTH);
> + if (rc < 0) {
> + dev_err(dev, "get device reset return value failed.\n");
> + return -1;
> + }
> +
> + rc = elan_i2c_get_desc(client, val);
> + if (rc < 0) {
> + dev_err(dev, "cannot get device descriptor.\n");
> + return -1;
> + }
> +
> + rc = elan_i2c_get_report_desc(client, val);
> + if (rc < 0) {
> + dev_err(dev, "fetching report descriptor failed.\n");
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +/**************************************************************************
> +* Genernal functions
> +***************************************************************************
> +*/
> +
> +/*
> + * (value from firmware) * 10 + 790 = dpi
> + * we also have to convert dpi to dots/mm (*10/254 to avoid floating point)
> + */
> +static unsigned int elan_convert_res(char val)
> +{
> + int res;
> + if (val & 0x80) {
> + val = ~val + 1;
> + res = (790 - val * 10) * 10 / 254;
> + } else
> + res = (val * 10 + 790) * 10 / 254;
> + return res;
> +}
> +
> +static int elan_get_iap_version(struct elan_tp_data *data)
> +{
> + int ret;
> + if (data->smbus) {
> + i2c_smbus_read_block_data(data->client,
> + ETP_SMBUS_IAP_VERSION_CMD, val);
> + ret = val[2];
> + } else {
> + elan_i2c_read_cmd(data->client,
> + ETP_I2C_IAP_VERSION_CMD, val);
> + ret = val[0];
> + }
> + return ret;
> +}
> +
> +static int elan_get_x_max(struct elan_tp_data *data)
> +{
> + int ret;
> + if (data->smbus) {
> + i2c_smbus_read_block_data(data->client,
> + ETP_SMBUS_RANGE_CMD, val);
> + ret = (0x0f & val[0]) << 8 | val[1];
> + } else {
> + elan_i2c_read_cmd(data->client,
> + ETP_I2C_MAX_X_AXIS_CMD, val);
> + ret = (0x0f & val[1]) << 8 | val[0];
> + }
> + return ret;
> +}
> +
> +static int elan_get_y_max(struct elan_tp_data *data)
> +{
> + int ret;
> + if (data->smbus) {
> + i2c_smbus_read_block_data(data->client,
> + ETP_SMBUS_RANGE_CMD, val);
> + ret = (0xf0 & val[0]) << 4 | val[2];
> + } else {
> + elan_i2c_read_cmd(data->client,
> + ETP_I2C_MAX_Y_AXIS_CMD, val);
> + ret = (0x0f & val[1]) << 8 | val[0];
> + }
> + return ret;
> +}
> +
> +static int elan_get_x_tracenum(struct elan_tp_data *data)
> +{
> + int ret;
> + if (data->smbus) {
> + i2c_smbus_read_block_data(data->client,
> + ETP_SMBUS_XY_TRACENUM_CMD, val);
> + ret = (val[1] - 1);
> + } else {
> + elan_i2c_read_cmd(data->client,
> + ETP_I2C_XY_TRACENUM_CMD, val);
> + ret = (val[0] - 1);
> + }
> + return ret;
> +}
> +
> +static int elan_get_y_tracenum(struct elan_tp_data *data)
> +{
> + int ret;
> + if (data->smbus) {
> + i2c_smbus_read_block_data(data->client,
> + ETP_SMBUS_XY_TRACENUM_CMD, val);
> + ret = (val[2] - 1);
> + } else {
> + ret = elan_i2c_read_cmd(data->client,
> + ETP_I2C_XY_TRACENUM_CMD, val);
> + ret = (val[1] - 1);
> + }
> + return ret;
> +}
> +
> +static int elan_get_fw_version(struct elan_tp_data *data)
> +{
> + int ret;
> + if (data->smbus) {
> + i2c_smbus_read_block_data(data->client,
> + ETP_SMBUS_FW_VERSION_CMD, val);
> + ret = val[2];
> + } else {
> + elan_i2c_read_cmd(data->client,
> + ETP_I2C_FW_VERSION_CMD, val);
> + ret = val[0];
> + }
> + return ret;
> +}
> +
> +static int elan_get_sm_version(struct elan_tp_data *data)
> +{
> + int ret;
> + if (data->smbus)
> + i2c_smbus_read_block_data(data->client,
> + ETP_SMBUS_SM_VERSION_CMD, val);
> + else
> + elan_i2c_read_block(data->client,
> + ETP_I2C_SM_VERSION_CMD, val, 1);
> + ret = val[0];
> + return ret;
> +}
> +
> +static int elan_get_unique_id(struct elan_tp_data *data)
> +{
> + int ret;
> + if (data->smbus) {
> + i2c_smbus_read_block_data(data->client,
> + ETP_SMBUS_UNIQUEID_CMD, val);
> + ret = val[1];
> + } else {
> + elan_i2c_read_cmd(data->client,
> + ETP_I2C_UNIQUEID_CMD, val);
> + ret = val[0];
> + }
> + return ret;
> +}
> +
> +static int elan_get_x_resolution(struct elan_tp_data *data)
> +{
> + int ret;
> + if (data->smbus) {
> + i2c_smbus_read_block_data(data->client,
> + ETP_SMBUS_RESOLUTION_CMD, val);
> + ret = elan_convert_res(val[1] & 0x0F);
> + } else {
> + elan_i2c_read_cmd(data->client,
> + ETP_I2C_RESOLUTION_CMD, val);
> + ret = elan_convert_res(val[0]);
> + }
> + return ret;
> +}
> +
> +static int elan_get_y_resolution(struct elan_tp_data *data)
> +{
> + int ret;
> + if (data->smbus) {
> + i2c_smbus_read_block_data(data->client,
> + ETP_SMBUS_RESOLUTION_CMD, val);
> + ret = elan_convert_res((val[1] & 0xF0) >> 4);
> + } else {
> + elan_i2c_read_cmd(data->client,
> + ETP_I2C_RESOLUTION_CMD, val);
> + ret = elan_convert_res(val[1]);
> + }
> + return ret;
> +}
> +
> +static int elan_get_fw_checksum(struct elan_tp_data *data)
> +{
> + int ret;
> + if (data->smbus) {
> + i2c_smbus_read_block_data(data->client,
> + ETP_SMBUS_FW_CHECKSUM_CMD, val);
> + ret = be16_to_cpup((__be16 *)val);
> + } else {
> + elan_i2c_read_cmd(data->client,
> + ETP_I2C_FW_CHECKSUM_CMD, val);
> + ret = le16_to_cpup((__le16 *)val);
> + }
> + return ret;
> +}
> +
> +static int elan_get_max_baseline(struct elan_tp_data *data)
> +{
> + int ret;
> + if (data->smbus) {
> + i2c_smbus_read_block_data(data->client,
> + ETP_SMBUS_MAX_BASELINE_CMD, val);
> + ret = be16_to_cpup((__be16 *)val);
> + } else {
> + elan_i2c_read_cmd(data->client,
> + ETP_I2C_MAX_BASELINE_CMD, val);
> + ret = le16_to_cpup((__le16 *)val);
> + }
> + return ret;
> +}
> +
> +static int elan_get_min_baseline(struct elan_tp_data *data)
> +{
> + int ret;
> + if (data->smbus) {
> + i2c_smbus_read_block_data(data->client,
> + ETP_SMBUS_MIN_BASELINE_CMD, val);
> + ret = be16_to_cpup((__be16 *)val);
> + } else {
> + elan_i2c_read_cmd(data->client,
> + ETP_I2C_MIN_BASELINE_CMD, val);
> + ret = le16_to_cpup((__le16 *)val);
> + }
> + return ret;
> +}
> +
> +static int elan_enable_calibrate(struct elan_tp_data *data)
> +{
> + int ret;
> + if (data->smbus)
> + ret = elan_smbus_enable_calibrate(data->client);
> + else
> + ret = elan_i2c_enable_calibrate(data->client);
> + return ret;
> +}
> +
> +static int elan_disable_calibrate(struct elan_tp_data *data)
> +{
> + int ret;
> + if (data->smbus)
> + ret = elan_smbus_disable_calibrate(data->client);
> + else
> + ret = elan_i2c_disable_calibrate(data->client);
> + return ret;
> +}
> +
> +static int elan_initialize(struct elan_tp_data *data)
> +{
> + int ret;
> + if (data->smbus) {
> + ret = elan_smbus_initialize(data->client);
> + if (ret < 0) {
> + dev_err(&data->client->dev,
> + "device initialize failed.\n");
> + goto err_initialize;
> + }
> +
> + ret = elan_smbus_enable_absolute_mode(data->client);
> + if (ret < 0)
> + dev_err(&data->client->dev,
> + "cannot switch to absolute mode.\n");
> + } else {
> + ret = elan_i2c_initialize(data->client);
> + if (ret < 0) {
> + dev_err(&data->client->dev,
> + "device initialize failed.\n");
> + goto err_initialize;
> + }
> +
> + ret = elan_i2c_enable_absolute_mode(data->client);
> + if (ret < 0) {
> + dev_err(&data->client->dev,
> + "cannot switch to absolute mode.\n");
> + goto err_initialize;
> + }
> +
> + ret = elan_i2c_wake_up(data->client);
> + if (ret < 0)
> + dev_err(&data->client->dev,
> + "device wake up failed.\n");
> + }
> +err_initialize:
> + return ret;
> +}
> +
> +/********************************************************************
> + * below routines export interfaces to sysfs file system.
> + * so user can get firmware/driver/hardware information using cat command.
> + * e.g.: use below command to get firmware version
> + * cat /sys/bus/i2c/drivers/elan_i2c/1-0015/firmware_version
> + *******************************************************************
> + */
> +static ssize_t elan_sysfs_enable_detailinfo(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct elan_tp_data *data = dev_get_drvdata(dev);
> + data->enable_detail_info = true;
What is this for?
> + return sprintf(buf, "enable\n");
> +}
> +
> +static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + unsigned int checksum = 0;
> + struct elan_tp_data *data = dev_get_drvdata(dev);
> + if (data->enable_detail_info == true) {
> + checksum = elan_get_fw_checksum(data);
> + data->enable_detail_info = false;
> + }
> + return sprintf(buf, "0x%04x\n", checksum);
> +}
> +
> +static ssize_t elan_sysfs_read_unique_id(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct elan_tp_data *data = dev_get_drvdata(dev);
> + data->unique_id = elan_get_unique_id(data);
> + return sprintf(buf, "0x%04x\n", data->unique_id);
> +}
> +
> +static ssize_t elan_sysfs_read_driver_ver(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + return sprintf(buf, "%s\n", ELAN_DRIVER_VERSION);
This should be reported in MODULE_VERSION if you need it.
> +}
> +
> +static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct elan_tp_data *data = dev_get_drvdata(dev);
> + data->fw_version = elan_get_fw_version(data);
> + return sprintf(buf, "0x%04x\n", data->fw_version);
> +}
> +
> +static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct elan_tp_data *data = dev_get_drvdata(dev);
> + data->sm_version = elan_get_sm_version(data);
> + return sprintf(buf, "0x%04x\n", data->sm_version);
> +}
> +
> +static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct elan_tp_data *data = dev_get_drvdata(dev);
> + data->iap_version = elan_get_iap_version(data);
> + return sprintf(buf, "0x%04x\n", data->iap_version);
> +}
> +
> +
> +static ssize_t elan_sysfs_update_fw(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct elan_tp_data *data = dev_get_drvdata(dev);
> + int ret;
> + ret = elan_firmware(data);
> + if (ret)
> + dev_err(dev, "firmware update failed.\n");
> + else
> + dev_info(dev, "firmware update succeeded.\n");
> + return ret ? ret : count;
> +}
> +
> +static ssize_t elan_sysfs_calibrate(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct elan_tp_data *data = dev_get_drvdata(dev);
> + /* start calibarate cmd */
> + u8 smbus_cmd[4] = {0x00, 0x08, 0x00, 0x01};
> + int tries = 20;
> + int ret = 0;
> + val[0] = 0;
> +
> + disable_irq(data->irq);
> + elan_enable_calibrate(data);
> + if (data->smbus)
> + i2c_smbus_write_block_data(data->client,
> + ETP_SMBUS_IAP_CMD, 4, smbus_cmd);
> + else
> + elan_i2c_write_cmd(data->client,
> + ETP_I2C_CALIBRATE_CMD, 1);
> +
> + do {
> + /* wait 250ms and check finish or not */
> + msleep(250);
> +
> + if (data->smbus)
> + i2c_smbus_read_block_data(data->client,
> + ETP_SMBUS_CALIBRATE_QUERY, val);
> + else
> + elan_i2c_read_block(data->client,
> + ETP_I2C_CALIBRATE_CMD, val, 1);
> +
> + /* calibrate finish */
> + if (val[0] == 0)
> + break;
> + } while (--tries);
> +
> + elan_disable_calibrate(data);
> + enable_irq(data->irq);
> +
> + if (tries == 0) {
> + dev_err(dev, "Failed to calibrate. Timeout.\n");
> + ret = -ETIMEDOUT;
> + }
> + return sprintf(buf, "calibration finish\n");
> +}
> +
> +
> +static ssize_t elan_sysfs_read_baseline(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct elan_tp_data *data = dev_get_drvdata(dev);
> + int max_baseline, min_baseline;
> +
> + disable_irq(data->irq);
> + elan_enable_calibrate(data);
> + msleep(250);
> + max_baseline = elan_get_max_baseline(data);
> + min_baseline = elan_get_min_baseline(data);
> + elan_disable_calibrate(data);
> + enable_irq(data->irq);
> + return sprintf(buf, "max:%d min:%d\n", max_baseline, min_baseline);
> +}
> +
> +static ssize_t elan_sysfs_reinitialize(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct elan_tp_data *data = dev_get_drvdata(dev);
> + int ret;
> +
> + disable_irq(data->irq);
> + ret = elan_initialize(data);
> + enable_irq(data->irq);
> +
> + if (ret < 0)
> + return sprintf(buf, "reinitialize fail\n");
> +
> + return sprintf(buf, "reinitialize success\n");
This actually should be a write method and instead of returning strings
you should use return code to indicate success/failure.
> +}
> +
> +static DEVICE_ATTR(unique_id, S_IRUGO, elan_sysfs_read_unique_id, NULL);
> +static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
> +static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
> +static DEVICE_ATTR(driver_version, S_IRUGO, elan_sysfs_read_driver_ver, NULL);
> +static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
> +static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
> +static DEVICE_ATTR(open_info, S_IRUGO, elan_sysfs_enable_detailinfo, NULL);
> +static DEVICE_ATTR(baseline, S_IRUGO, elan_sysfs_read_baseline, NULL);
> +static DEVICE_ATTR(reinitialize, S_IRUGO, elan_sysfs_reinitialize, NULL);
> +static DEVICE_ATTR(calibrate, S_IRUGO, elan_sysfs_calibrate, NULL);
> +static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
> +
> +static struct attribute *elan_sysfs_entries[] = {
> + &dev_attr_unique_id.attr,
> + &dev_attr_firmware_version.attr,
> + &dev_attr_sample_version.attr,
> + &dev_attr_driver_version.attr,
> + &dev_attr_iap_version.attr,
> + &dev_attr_fw_checksum.attr,
> + &dev_attr_open_info.attr,
> + &dev_attr_baseline.attr,
> + &dev_attr_reinitialize.attr,
> + &dev_attr_calibrate.attr,
> + &dev_attr_update_fw.attr,
> + NULL,
Please add documentation for sysfs entries to Documentation/...
> +};
> +
> +static const struct attribute_group elan_sysfs_group = {
> + .attrs = elan_sysfs_entries,
> +};
> +
> +/*****************************************************************
> +* Elan isr functions
> +******************************************************************
> +*/
> +
> +static int elan_check_packet(struct elan_tp_data *data, u8 *packet)
> +{
> + u8 rid;
> +
> + if (data->smbus)
> + rid = packet[0];
> + else
> + rid = packet[ETP_I2C_REPORT_ID_OFFSET];
> +
> + /* check report id */
> + if (rid != ETP_REPORT_ID) {
> + dev_err(&data->client->dev, "report id [%x] fail.\n", rid);
> + return -1;
> + }
> + return 0;
> +}
> +
> +static void elan_report_absolute(struct elan_tp_data *data, u8 *packet)
> +{
> + struct input_dev *input = data->input;
> + u8 *finger_data;
> + bool finger_on;
> + int pos_x, pos_y;
> + int pressure, mk_x, mk_y;
> + int i, area_x, area_y, major, minor, new_pressure;
> + int finger_count = 0;
> + int btn_click;
> + u8 tp_info;
> +
> + if (data->smbus) {
> + finger_data = &packet[ETP_SMBUS_FINGER_DATA_OFFSET];
> + tp_info = packet[1];
> + } else {
> + finger_data = &packet[ETP_I2C_FINGER_DATA_OFFSET];
> + tp_info = packet[3];
> + }
> +
> + btn_click = (tp_info & 0x01);
> + for (i = 0; i < ETP_MAX_FINGERS; i++) {
> + finger_on = (tp_info >> (3 + i)) & 0x01;
> +
> + /* analyze touched finger raw data*/
> + if (finger_on) {
> + pos_x = ((finger_data[0] & 0xf0) << 4) |
> + finger_data[1];
> + pos_y = ((finger_data[0] & 0x0f) << 8) |
> + finger_data[2];
> + pos_y = data->max_y - pos_y;
> + mk_x = (finger_data[3] & 0x0f);
> + mk_y = (finger_data[3] >> 4);
> + pressure = finger_data[4];
> +
> + /*
> + to avoid fat finger be as palm, so reduce the
> + width x and y per trace
> + */
> + area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
> + area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
> +
> + major = max(area_x, area_y);
> + minor = min(area_x, area_y);
> +
> + new_pressure = pressure + ETP_PRESSURE_OFFSET;
> + if (new_pressure > ETP_MAX_PRESSURE)
> + new_pressure = ETP_MAX_PRESSURE;
> +
> + input_mt_slot(input, i);
> + input_mt_report_slot_state(input, MT_TOOL_FINGER,
> + true);
> + input_report_abs(input, ABS_MT_POSITION_X, pos_x);
> + input_report_abs(input, ABS_MT_POSITION_Y, pos_y);
> + input_report_abs(input, ABS_MT_PRESSURE, new_pressure);
> + input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
> + input_report_abs(input, ABS_MT_TOUCH_MAJOR, major);
> + input_report_abs(input, ABS_MT_TOUCH_MINOR, minor);
> + finger_data += ETP_FINGER_DATA_LEN;
> + finger_count++;
> + } else {
> + input_mt_slot(input, i);
> + input_mt_report_slot_state(input,
> + MT_TOOL_FINGER, false);
> + }
> + }
> +
> + input_report_key(input, BTN_LEFT, (btn_click == 1));
> + input_mt_report_pointer_emulation(input, true);
> + input_sync(input);
> +}
> +
> +static irqreturn_t elan_isr(int irq, void *dev_id)
> +{
> + struct elan_tp_data *data = dev_id;
> + u8 raw[ETP_MAX_REPORT_LEN];
> + int retval;
> + int report_len;
> +
> + retval = mutex_lock_interruptible(&data->dbfs_mutex);
> + if (retval)
> + return IRQ_HANDLED;
> +
> + /*
> + Only in I2C protocol, when IAP all page wrote finish, driver will
> + get one INT signal from high to low, and driver must get 0000
> + to confirm IAP is finished.
> + */
> + if (data->updated_fw) {
> + retval = i2c_master_recv(data->client, raw,
> + ETP_INF_LENGTH);
> + if (retval == 2 && !le16_to_cpup((__le16 *)raw)) {
> + dev_info(&data->client->dev,
> + "reinitializing after F/W update...");
> + elan_initialize(data);
> + }
> + data->updated_fw = false;
> + goto elan_isr_end;
> + }
> +
> + if (data->smbus) {
> + report_len = ETP_SMBUS_REPORT_LEN;
> + retval = i2c_smbus_read_block_data(data->client,
> + ETP_SMBUS_PACKET_QUERY, raw);
> + } else {
> + report_len = ETP_I2C_REPORT_LEN;
> + retval = i2c_master_recv(data->client, raw, report_len);
> + }
> +
> + if (retval != report_len) {
> + dev_err(&data->client->dev, "wrong packet len(%d)", retval);
> + goto elan_isr_end;
> + }
> +
> + if (elan_check_packet(data, raw) < 0) {
> + dev_err(&data->client->dev, "wrong packet format.");
> + goto elan_isr_end;
> + }
> + elan_report_absolute(data, raw);
> + data->dbfs_buffer.bfetch = false;
> + memcpy(data->dbfs_buffer.buffer, raw, report_len);
> +
> +elan_isr_end:
> + mutex_unlock(&data->dbfs_mutex);
> + return IRQ_HANDLED;
> +}
> +
> +
> +static int elan_input_dev_create(struct elan_tp_data *data)
> +{
> + struct i2c_client *client = data->client;
> + struct input_dev *input;
> + unsigned int x_res, y_res;
> + int ret;
> +
> + data->input = input = input_allocate_device();
> + if (!input)
> + return -ENOMEM;
> + input->name = "Elan Touchpad";
> + input->id.bustype = BUS_I2C;
> + input->dev.parent = &data->client->dev;
> +
> + __set_bit(INPUT_PROP_POINTER, input->propbit);
> + __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
> + __set_bit(EV_KEY, input->evbit);
> + __set_bit(EV_ABS, input->evbit);
> +
> + __set_bit(BTN_LEFT, input->keybit);
> + __set_bit(BTN_TOUCH, input->keybit);
> + __set_bit(BTN_TOOL_FINGER, input->keybit);
> + __set_bit(BTN_TOOL_DOUBLETAP, input->keybit);
> + __set_bit(BTN_TOOL_TRIPLETAP, input->keybit);
> + __set_bit(BTN_TOOL_QUADTAP, input->keybit);
> + __set_bit(BTN_TOOL_QUINTTAP, input->keybit);
> +
> + __set_bit(ABS_MT_TOUCH_MAJOR, input->absbit);
> + __set_bit(ABS_MT_TOUCH_MINOR, input->absbit);
> + __set_bit(ABS_MT_POSITION_X, input->absbit);
> + __set_bit(ABS_MT_POSITION_Y, input->absbit);
> +
> + data->unique_id = elan_get_unique_id(data);
> + data->fw_version = elan_get_fw_version(data);
> + data->sm_version = elan_get_sm_version(data);
> + data->iap_version = elan_get_iap_version(data);
> + data->max_x = elan_get_x_max(data);
> + data->max_y = elan_get_y_max(data);
> + data->width_x = data->max_x / elan_get_x_tracenum(data);
> + data->width_y = data->max_y / elan_get_y_tracenum(data);
> + x_res = elan_get_x_resolution(data);
> + y_res = elan_get_y_resolution(data);
> +
> + dev_info(&client->dev,
> + "Elan Touchpad Information:\n"
> + " Module unique ID: 0x%04x\n"
> + " Firmware Version: 0x%04x\n"
> + " Sample Version: 0x%04x\n"
> + " IAP Version: 0x%04x\n"
> + " Max ABS X,Y: %d,%d\n"
> + " Width X,Y: %d,%d\n"
> + " Resolution X,Y: %d,%d (dots/mm)\n",
> + data->unique_id,
> + data->fw_version,
> + data->sm_version,
> + data->iap_version,
> + data->max_x, data->max_y,
> + data->width_x, data->width_y,
> + (char)x_res, (char)y_res);
Why cast to char?
> +
> + input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
> + input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
> + input_abs_set_res(input, ABS_X, x_res);
> + input_abs_set_res(input, ABS_Y, y_res);
> + input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
> + input_set_abs_params(input, ABS_TOOL_WIDTH, 0, ETP_FINGER_WIDTH, 0, 0);
> +
> + /* handle pointer emulation and unused slots in core */
> + ret = input_mt_init_slots(input, ETP_MAX_FINGERS,
> + INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
> + if (ret) {
> + dev_info(&client->dev, "allocate MT slots failed, %d\n", ret);
> + goto err_free_device;
> + }
> + input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
> + input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
> + input_abs_set_res(input, ABS_MT_POSITION_X, x_res);
> + input_abs_set_res(input, ABS_MT_POSITION_Y, y_res);
> + input_set_abs_params(input, ABS_MT_PRESSURE, 0,
> + ETP_MAX_PRESSURE, 0, 0);
> + input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0,
> + ETP_FINGER_WIDTH * max(data->width_x, data->width_y), 0, 0);
> + input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0,
> + ETP_FINGER_WIDTH * min(data->width_x, data->width_y), 0, 0);
> +
> + /* Register the device in input subsystem */
> + ret = input_register_device(input);
> + if (ret) {
> + dev_err(&client->dev, "input device register failed, %d\n",
> + ret);
> + goto err_free_device;
> + }
> +
> + return 0;
> +
> +err_free_device:
> + input_free_device(input);
> + return ret;
> +}
> +
> +static u8 elan_check_adapter_functionality(struct i2c_client *client)
> +{
> + u8 ret = ELAN_ADAPTER_FUNC_NONE;
> +
> + if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
> + ret |= ELAN_ADAPTER_FUNC_I2C;
> + if (i2c_check_functionality(client->adapter,
> + I2C_FUNC_SMBUS_BYTE_DATA |
> + I2C_FUNC_SMBUS_BLOCK_DATA |
> + I2C_FUNC_SMBUS_I2C_BLOCK))
> + ret |= ELAN_ADAPTER_FUNC_SMBUS;
> + return ret;
> +}
> +
> +static int elan_probe(struct i2c_client *client,
> + const struct i2c_device_id *dev_id)
> +{
> + struct elan_tp_data *data;
> + int ret;
> + u8 adapter_func;
> + union i2c_smbus_data dummy;
> + struct device *dev = &client->dev;
> +
> + adapter_func = elan_check_adapter_functionality(client);
> + if (adapter_func == ELAN_ADAPTER_FUNC_NONE) {
> + dev_err(dev, "not a supported I2C/SMBus adapter\n");
> + return -EIO;
> + }
> +
> + /* Make sure there is something at this address */
> + if (dev->of_node && i2c_smbus_xfer(client->adapter, client->addr, 0,
> + I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0)
> + return -ENODEV;
> +
> + data = kzalloc(sizeof(struct elan_tp_data), GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + /* check protocol type */
> + if (adapter_func == ELAN_ADAPTER_FUNC_SMBUS)
> + data->smbus = true;
> + else
> + data->smbus = false;
> + data->client = client;
> + data->updated_fw = false;
> + data->enable_detail_info = false;
> + data->irq = client->irq;
> +
> + ret = elan_dbfs_init(data);
> + if (ret < 0) {
> + dev_err(&client->dev, "error create elan debugfs.\n");
> + goto err_dbfs_init;
> + }
> + ret = request_threaded_irq(client->irq, NULL, elan_isr,
> + IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> + client->name, data);
> + if (ret < 0) {
> + dev_err(&client->dev, "cannot register irq=%d\n",
> + client->irq);
> + goto err_irq;
> + }
> +
> + /* initial elan touch pad */
> + ret = elan_initialize(data);
> + if (ret < 0)
> + goto err_init;
> +
> + /* create input device */
> + ret = elan_input_dev_create(data);
> + if (ret < 0)
> + goto err_input_dev;
> +
> + device_init_wakeup(&client->dev, 1);
> + ret = sysfs_create_group(&client->dev.kobj, &elan_sysfs_group);
> + if (ret < 0) {
> + dev_err(&client->dev, "cannot register dev attribute %d", ret);
> + goto err_create_group;
> + }
> + i2c_set_clientdata(client, data);
> + return 0;
> +
> +err_create_group:
> + input_free_device(data->input);
The device is registered here so you need to call unregister, not free.
> +err_input_dev:
> +err_init:
> + free_irq(data->irq, data);
> +err_irq:
> + debugfs_remove_recursive(data->dbfs_root);
> + mutex_destroy(&data->dbfs_mutex);
> +err_dbfs_init:
> + kfree(data);
> + dev_err(&client->dev, "Elan Trackpad probe fail!\n");
> + return ret;
> +}
> +
> +static int elan_remove(struct i2c_client *client)
> +{
> + struct elan_tp_data *data = i2c_get_clientdata(client);
> +
> + free_irq(data->irq, data);
> + debugfs_remove_recursive(data->dbfs_root);
> + mutex_destroy(&data->dbfs_mutex);
> +
> + input_free_device(data->input);
Not needed (and harmful here).
> + input_unregister_device(data->input);
> + kfree(data);
> + sysfs_remove_group(&client->dev.kobj, &elan_sysfs_group);
I'd start with removing sysfs attributes as first thing in remove().
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int elan_suspend(struct device *dev)
> +{
> + int ret;
> + struct elan_tp_data *data = dev_get_drvdata(dev);
> +
> + disable_irq(data->irq);
> + if (data->smbus)
> + ret = i2c_smbus_write_byte(data->client,
> + ETP_SMBUS_DISABLE_TP);
> + else
> + ret = elan_i2c_sleep(data->client);
> +
> + if (ret < 0) {
> + dev_err(dev, "suspend mode failed, %d\n", ret);
> + } else {
> + if (device_may_wakeup(dev))
> + data->irq_wake = (enable_irq_wake(data->irq) == 0);
> + }
> + return 0;
> +}
> +
> +static int elan_resume(struct device *dev)
> +{
> + int ret = 0;
> + struct elan_tp_data *data = dev_get_drvdata(dev);
> +
> + if (device_may_wakeup(dev) && data->irq_wake)
> + disable_irq_wake(data->irq);
> +
> + ret = elan_initialize(data);
> + if (ret < 0)
> + dev_err(dev, "resume active power failed, %d\n", ret);
> +
> + enable_irq(data->irq);
> + return 0;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
> +
> +static const struct i2c_device_id elan_id[] = {
> + { DRIVER_NAME, 0 },
> + { },
> +};
> +MODULE_DEVICE_TABLE(i2c, elan_id);
> +
> +static struct i2c_driver elan_driver = {
> + .driver = {
> + .name = DRIVER_NAME,
> + .owner = THIS_MODULE,
> + .pm = &elan_pm_ops,
> + },
> + .probe = elan_probe,
> + .remove = elan_remove,
> + .id_table = elan_id,
> +};
> +
> +
> +static int __init elan_init(void)
> +{
> + int ret;
> + ret = i2c_add_driver(&elan_driver);
> + if (ret) {
> + pr_err("elan driver register FAILED.\n");
> + return ret;
> + }
> +
> + return ret;
> +}
> +
> +static void __exit elan_exit(void)
> +{
> + i2c_del_driver(&elan_driver);
> +}
> +
> +module_init(elan_init);
> +module_exit(elan_exit);
module_i2c_driver().
> +
> +MODULE_AUTHOR("Duson Lin <dusonlin@....com.tw>");
> +MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
> +MODULE_LICENSE("GPL");
> --
> 1.7.10.4
>
Thanks.
--
Dmitry
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