/*
* Synaptics TouchPad PS/2 mouse driver
*
* 2003 Dmitry Torokhov <dtor@mail.ru>
* Added support for pass-through port. Special thanks to Peter Berg Larsen
* for explaining various Synaptics quirks.
*
* 2003 Peter Osterlund <petero2@telia.com>
* Ported to 2.5 input device infrastructure.
*
* Copyright (C) 2001 Stefan Gmeiner <riddlebox@freesurf.ch>
* start merging tpconfig and gpm code to a xfree-input module
* adding some changes and extensions (ex. 3rd and 4th button)
*
* Copyright (c) 1997 C. Scott Ananian <cananian@alumni.priceton.edu>
* Copyright (c) 1998-2000 Bruce Kalk <kall@compass.com>
* code for the special synaptics commands (from the tpconfig-source)
*
* 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/module.h>
#include <linux/input.h>
#include <linux/serio.h>
#include <linux/libps2.h>
#include "psmouse.h"
#include "synaptics.h"
/*
* The x/y limits are taken from the Synaptics TouchPad interfacing Guide,
* section 2.3.2, which says that they should be valid regardless of the
* actual size of the sensor.
*/
#define XMIN_NOMINAL 1472
#define XMAX_NOMINAL 5472
#define YMIN_NOMINAL 1408
#define YMAX_NOMINAL 4448
/*****************************************************************************
* Synaptics communications functions
****************************************************************************/
/*
* Send a command to the synpatics touchpad by special commands
*/
static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c, unsigned char *param)
{
if (psmouse_sliced_command(psmouse, c))
return -1;
if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO))
return -1;
return 0;
}
/*
* Set the synaptics touchpad mode byte by special commands
*/
static int synaptics_mode_cmd(struct psmouse *psmouse, unsigned char mode)
{
unsigned char param[1];
if (psmouse_sliced_command(psmouse, mode))
return -1;
param[0] = SYN_PS_SET_MODE2;
if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_SETRATE))
return -1;
return 0;
}
/*
* Read the model-id bytes from the touchpad
* see also SYN_MODEL_* macros
*/
static int synaptics_model_id(struct psmouse *psmouse)
{
struct synaptics_data *priv = psmouse->private;
unsigned char mi[3];
if (synaptics_send_cmd(psmouse, SYN_QUE_MODEL, mi))
return -1;
priv->model_id = (mi[0]<<16) | (mi[1]<<8) | mi[2];
return 0;
}
/*
* Read the capability-bits from the touchpad
* see also the SYN_CAP_* macros
*/
static int synaptics_capability(struct psmouse *psmouse)
{
struct synaptics_data *priv = psmouse->private;
unsigned char cap[3];
if (synaptics_send_cmd(psmouse, SYN_QUE_CAPABILITIES, cap))
return -1;
priv->capabilities = (cap[0] << 16) | (cap[1] << 8) | cap[2];
priv->ext_cap = 0;
if (!SYN_CAP_VALID(priv->capabilities))
return -1;
/*
* Unless capExtended is set the rest of the flags should be ignored
*/
if (!SYN_CAP_EXTENDED(priv->capabilities))
priv->capabilities = 0;
if (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 1) {
if (synaptics_send_cmd(psmouse, SYN_QUE_EXT_CAPAB, cap)) {
printk(KERN_ERR "Synaptics claims to have extended capabilities,"
" but I'm not able to read them.");
} else {
priv->ext_cap = (cap[0] << 16) | (cap[1] << 8) | cap[2];
/*
* if nExtBtn is greater than 8 it should be considered
* invalid and treated as 0
*/
if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) > 8)
priv->ext_cap &= 0xff0fff;
}
}
return 0;
}
/*
* Identify Touchpad
* See also the SYN_ID_* macros
*/
static int synaptics_identify(struct psmouse *psmouse)
{
struct synaptics_data *priv = psmouse->private;
unsigned char id[3];
if (synaptics_send_cmd(psmouse, SYN_QUE_IDENTIFY, id))
return -1;
priv->identity = (id[0]<<16) | (id[1]<<8) | id[2];
if (SYN_ID_IS_SYNAPTICS(priv->identity))
return 0;
return -1;
}
static void print_ident(struct synaptics_data *priv)
{
printk(KERN_INFO "Synaptics Touchpad, model: %ld\n", SYN_ID_MODEL(priv->identity));
printk(KERN_INFO " Firmware: %ld.%ld\n", SYN_ID_MAJOR(priv->identity),
SYN_ID_MINOR(priv->identity));
if (SYN_MODEL_ROT180(priv->model_id))
printk(KERN_INFO " 180 degree mounted touchpad\n");
if (SYN_MODEL_PORTRAIT(priv->model_id))
printk(KERN_INFO " portrait touchpad\n");
printk(KERN_INFO " Sensor: %ld\n", SYN_MODEL_SENSOR(priv->model_id));
if (SYN_MODEL_NEWABS(priv->model_id))
printk(KERN_INFO " new absolute packet format\n");
if (SYN_MODEL_PEN(priv->model_id))
printk(KERN_INFO " pen detection\n");
if (SYN_CAP_EXTENDED(priv->capabilities)) {
printk(KERN_INFO " Touchpad has extended capability bits\n");
if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap))
printk(KERN_INFO " -> %d multi-buttons, i.e. besides standard buttons\n",
(int)(SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap)));
if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
printk(KERN_INFO " -> middle button\n");
if (SYN_CAP_FOUR_BUTTON(priv->capabilities))
printk(KERN_INFO " -> four buttons\n");
if (SYN_CAP_MULTIFINGER(priv->capabilities))
printk(KERN_INFO " -> multifinger detection\n");
if (SYN_CAP_PALMDETECT(priv->capabilities))
printk(KERN_INFO " -> palm detection\n");
if (SYN_CAP_PASS_THROUGH(priv->capabilities))
printk(KERN_INFO " -> pass-through port\n");
}
}
static int synaptics_query_hardware(struct psmouse *psmouse)
{
int retries = 0;
while ((retries++ < 3) && psmouse_reset(psmouse))
printk(KERN_ERR "synaptics reset failed\n");
if (synaptics_identify(psmouse))
return -1;
if (synaptics_model_id(psmouse))
return -1;
if (synaptics_capability(psmouse))
return -1;
return 0;
}
static int synaptics_set_absolute_mode(struct psmouse *psmouse)
{
struct synaptics_data *priv = psmouse->private;
priv->mode = SYN_BIT_ABSOLUTE_MODE;
if (SYN_ID_MAJOR(priv->identity) >= 4)
priv->mode |= SYN_BIT_DISABLE_GESTURE;
if (SYN_CAP_EXTENDED(priv->capabilities))
priv->mode |= SYN_BIT_W_MODE;
if (synaptics_mode_cmd(psmouse, priv->mode))
return -1;
return 0;
}
static void synaptics_set_rate(struct psmouse *psmouse, unsigned int rate)
{
struct synaptics_data *priv = psmouse->private;
if (rate >= 80) {
priv->mode |= SYN_BIT_HIGH_RATE;
psmouse->rate = 80;
} else {
priv->mode &= ~SYN_BIT_HIGH_RATE;
psmouse->rate = 40;
}
synaptics_mode_cmd(psmouse, priv->mode);
}
/*****************************************************************************
* Synaptics pass-through PS/2 port support
****************************************************************************/
static int synaptics_pt_write(struct serio *serio, unsigned char c)
{
struct psmouse *parent = serio_get_drvdata(serio->parent);
char rate_param = SYN_PS_CLIENT_CMD; /* indicates that we want pass-through port */
if (psmouse_sliced_command(parent, c))
return -1;
if (ps2_command(&parent->ps2dev, &rate_param, PSMOUSE_CMD_SETRATE))
return -1;
return 0;
}
static inline int synaptics_is_pt_packet(unsigned char *buf)
{
return (buf[0] & 0xFC) == 0x84 && (buf[3] & 0xCC) == 0xC4;
}
static void synaptics_pass_pt_packet(struct serio *ptport, unsigned char *packet)
{
struct psmouse *child = serio_get_drvdata(ptport);
if (child && child->state == PSMOUSE_ACTIVATED) {
serio_interrupt(ptport, packet[1], 0, NULL);
serio_interrupt(ptport, packet[4], 0, NULL);
serio_interrupt(ptport, packet[5], 0, NULL);
if (child->type >= PSMOUSE_GENPS)
serio_interrupt(ptport, packet[2], 0, NULL);
} else
serio_interrupt(ptport, packet[1], 0, NULL);
}
static void synaptics_pt_activate(struct psmouse *psmouse)
{
struct serio *ptport = psmouse->ps2dev.serio->child;
struct psmouse *child = serio_get_drvdata(ptport);
struct synaptics_data *priv = psmouse->private;
/* adjust the touchpad to child's choice of protocol */
if (child) {
if (child->type >= PSMOUSE_GENPS)
priv->mode |= SYN_BIT_FOUR_BYTE_CLIENT;
else
priv->mode &= ~SYN_BIT_FOUR_BYTE_CLIENT;
if (synaptics_mode_cmd(psmouse, priv->mode))
printk(KERN_INFO "synaptics: failed to switch guest protocol\n");
}
}
static void synaptics_pt_create(struct psmouse *psmouse)
{
struct serio *serio;
serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
if (!serio) {
printk(KERN_ERR "synaptics: not enough memory to allocate pass-through port\n");
return;
}
memset(serio, 0, sizeof(struct serio));
serio->id.type = SERIO_PS_PSTHRU;
strlcpy(serio->name, "Synaptics pass-through", sizeof(serio->name));
strlcpy(serio->phys, "synaptics-pt/serio0", sizeof(serio->name));
serio->write = synaptics_pt_write;
serio->parent = psmouse->ps2dev.serio;
psmouse->pt_activate = synaptics_pt_activate;
printk(KERN_INFO "serio: %s port at %s\n", serio->name, psmouse->phys);
serio_register_port(serio);
}
/*****************************************************************************
* Functions to interpret the absolute mode packets
****************************************************************************/
static void synaptics_parse_hw_state(unsigned char buf[], struct synaptics_data *priv, struct synaptics_hw_state *hw)
{
memset(hw, 0, sizeof(struct synaptics_hw_state));
if (SYN_MODEL_NEWABS(priv->model_id)) {
hw->x = (((buf[3] & 0x10) << 8) |
((buf[1] & 0x0f) << 8) |
buf[4]);
hw->y = (((buf[3] & 0x20) << 7) |
((buf[1] & 0xf0) << 4) |
buf[5]);
hw->z = buf[2];
hw->w = (((buf[0] & 0x30) >> 2) |
((buf[0] & 0x04) >> 1) |
((buf[3] & 0x04) >> 2));
hw->left = (buf[0] & 0x01) ? 1 : 0;
hw->right = (buf[0] & 0x02) ? 1 : 0;
if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities)) {
hw->middle = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
if (hw->w == 2)
hw->scroll = (signed char)(buf[1]);
}
if (SYN_CAP_FOUR_BUTTON(priv->capabilities)) {
hw->up = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
hw->down = ((buf[0] ^ buf[3]) & 0x02) ? 1 : 0;
}
if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) &&
((buf[0] ^ buf[3]) & 0x02)) {
switch (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) & ~0x01) {
default:
/*
* if nExtBtn is greater than 8 it should be
* considered invalid and treated as 0
*/
break;
case 8:
hw->ext_buttons |= ((buf[5] & 0x08)) ? 0x80 : 0;
hw->ext_buttons |= ((buf[4] & 0x08)) ? 0x40 : 0;
case 6:
hw->ext_buttons |= ((buf[5] & 0x04)) ? 0x20 : 0;
hw->ext_buttons |= ((buf[4] & 0x04)) ? 0x10 : 0;
case 4:
hw->ext_buttons |= ((buf[5] & 0x02)) ? 0x08 : 0;
hw->ext_buttons |= ((buf[4] & 0x02)) ? 0x04 : 0;
case 2:
hw->ext_buttons |= ((buf[5] & 0x01)) ? 0x02 : 0;
hw->ext_buttons |= ((buf[4] & 0x01)) ? 0x01 : 0;
}
}
} else {
hw->x = (((buf[1] & 0x1f) << 8) | buf[2]);
hw->y = (((buf[4] & 0x1f) << 8) | buf[5]);
hw->z = (((buf[0] & 0x30) << 2) | (buf[3] & 0x3F));
hw->w = (((buf[1] & 0x80) >> 4) | ((buf[0] & 0x04) >> 1));
hw->left = (buf[0] & 0x01) ? 1 : 0;
hw->right = (buf[0] & 0x02) ? 1 : 0;
}
}
/*
* called for each full received packet from the touchpad
*/
static void synaptics_process_packet(struct psmouse *psmouse)
{
struct input_dev *dev = &psmouse->dev;
struct synaptics_data *priv = psmouse->private;
struct synaptics_hw_state hw;
int num_fingers;
int finger_width;
int i;
synaptics_parse_hw_state(psmouse->packet, priv, &hw);
if (hw.scroll) {
priv->scroll += hw.scroll;
while (priv->scroll >= 4) {
input_report_key(dev, BTN_BACK, !hw.down);
input_sync(dev);
input_report_key(dev, BTN_BACK, hw.down);
input_sync(dev);
priv->scroll -= 4;
}
while (priv->scroll <= -4) {
input_report_key(dev, BTN_FORWARD, !hw.up);
input_sync(dev);
input_report_key(dev, BTN_FORWARD, hw.up);
input_sync(dev);
priv->scroll += 4;
}
return;
}
if (hw.z > 0) {
num_fingers = 1;
finger_width = 5;
if (SYN_CAP_EXTENDED(priv->capabilities)) {
switch (hw.w) {
case 0 ... 1:
if (SYN_CAP_MULTIFINGER(priv->capabilities))
num_fingers = hw.w + 2;
break;
case 2:
if (SYN_MODEL_PEN(priv->model_id))
; /* Nothing, treat a pen as a single finger */
break;
case 4 ... 15:
if (SYN_CAP_PALMDETECT(priv->capabilities))
finger_width = hw.w;
break;
}
}
} else {
num_fingers = 0;
finger_width = 0;
}
/* Post events
* BTN_TOUCH has to be first as mousedev relies on it when doing
* absolute -> relative conversion
*/
if (hw.z > 30) input_report_key(dev, BTN_TOUCH, 1);
if (hw.z < 25) input_report_key(dev, BTN_TOUCH, 0);
if (hw.z > 0) {
input_report_abs(dev, ABS_X, hw.x);
input_report_abs(dev, ABS_Y, YMAX_NOMINAL + YMIN_NOMINAL - hw.y);
}
input_report_abs(dev, ABS_PRESSURE, hw.z);
input_report_abs(dev, ABS_TOOL_WIDTH, finger_width);
input_report_key(dev, BTN_TOOL_FINGER, num_fingers == 1);
input_report_key(dev, BTN_TOOL_DOUBLETAP, num_fingers == 2);
input_report_key(dev, BTN_TOOL_TRIPLETAP, num_fingers == 3);
input_report_key(dev, BTN_LEFT, hw.left);
input_report_key(dev, BTN_RIGHT, hw.right);
if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
input_report_key(dev, BTN_MIDDLE, hw.middle);
if (SYN_CAP_FOUR_BUTTON(priv->capabilities)) {
input_report_key(dev, BTN_FORWARD, hw.up);
input_report_key(dev, BTN_BACK, hw.down);
}
for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap); i++)
input_report_key(dev, BTN_0 + i, hw.ext_buttons & (1 << i));
input_sync(dev);
}
static int synaptics_validate_byte(unsigned char packet[], int idx, unsigned char pkt_type)
{
static unsigned char newabs_mask[] = { 0xC8, 0x00, 0x00, 0xC8, 0x00 };
static unsigned char newabs_rel_mask[] = { 0xC0, 0x00, 0x00, 0xC0, 0x00 };
static unsigned char newabs_rslt[] = { 0x80, 0x00, 0x00, 0xC0, 0x00 };
static unsigned char oldabs_mask[] = { 0xC0, 0x60, 0x00, 0xC0, 0x60 };
static unsigned char oldabs_rslt[] = { 0xC0, 0x00, 0x00, 0x80, 0x00 };
if (idx < 0 || idx > 4)
return 0;
switch (pkt_type) {
case SYN_NEWABS:
case SYN_NEWABS_RELAXED:
return (packet[idx] & newabs_rel_mask[idx]) == newabs_rslt[idx];
case SYN_NEWABS_STRICT:
return (packet[idx] & newabs_mask[idx]) == newabs_rslt[idx];
case SYN_OLDABS:
return (packet[idx] & oldabs_mask[idx]) == oldabs_rslt[idx];
default:
printk(KERN_ERR "synaptics: unknown packet type %d\n", pkt_type);
return 0;
}
}
static unsigned char synaptics_detect_pkt_type(struct psmouse *psmouse)
{
int i;
for (i = 0; i < 5; i++)
if (!synaptics_validate_byte(psmouse->packet, i, SYN_NEWABS_STRICT)) {
printk(KERN_INFO "synaptics: using relaxed packet validation\n");
return SYN_NEWABS_RELAXED;
}
return SYN_NEWABS_STRICT;
}
static psmouse_ret_t synaptics_process_byte(struct psmouse *psmouse, struct pt_regs *regs)
{
struct input_dev *dev = &psmouse->dev;
struct synaptics_data *priv = psmouse->private;
input_regs(dev, regs);
if (psmouse->pktcnt >= 6) { /* Full packet received */
if (unlikely(priv->pkt_type == SYN_NEWABS))
priv->pkt_type = synaptics_detect_pkt_type(psmouse);
if (SYN_CAP_PASS_THROUGH(priv->capabilities) && synaptics_is_pt_packet(psmouse->packet)) {
if (psmouse->ps2dev.serio->child)
synaptics_pass_pt_packet(psmouse->ps2dev.serio->child, psmouse->packet);
} else
synaptics_process_packet(psmouse);
return PSMOUSE_FULL_PACKET;
}
return synaptics_validate_byte(psmouse->packet, psmouse->pktcnt - 1, priv->pkt_type) ?
PSMOUSE_GOOD_DATA : PSMOUSE_BAD_DATA;
}
/*****************************************************************************
* Driver initialization/cleanup functions
****************************************************************************/
static void set_input_params(struct input_dev *dev, struct synaptics_data *priv)
{
int i;
set_bit(EV_ABS, dev->evbit);
input_set_abs_params(dev, ABS_X, XMIN_NOMINAL, XMAX_NOMINAL, 0, 0);
input_set_abs_params(dev, ABS_Y, YMIN_NOMINAL, YMAX_NOMINAL, 0, 0);
input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
set_bit(ABS_TOOL_WIDTH, dev->absbit);
set_bit(EV_KEY, dev->evbit);
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_LEFT, dev->keybit);
set_bit(BTN_RIGHT, dev->keybit);
if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
set_bit(BTN_MIDDLE, dev->keybit);
if (SYN_CAP_FOUR_BUTTON(priv->capabilities) ||
SYN_CAP_MIDDLE_BUTTON(priv->capabilities)) {
set_bit(BTN_FORWARD, dev->keybit);
set_bit(BTN_BACK, dev->keybit);
}
for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap); i++)
set_bit(BTN_0 + i, dev->keybit);
clear_bit(EV_REL, dev->evbit);
clear_bit(REL_X, dev->relbit);
clear_bit(REL_Y, dev->relbit);
}
void synaptics_reset(struct psmouse *psmouse)
{
/* reset touchpad back to relative mode, gestures enabled */
synaptics_mode_cmd(psmouse, 0);
}
static void synaptics_disconnect(struct psmouse *psmouse)
{
synaptics_reset(psmouse);
kfree(psmouse->private);
psmouse->private = NULL;
}
static int synaptics_reconnect(struct psmouse *psmouse)
{
struct synaptics_data *priv = psmouse->private;
struct synaptics_data old_priv = *priv;
if (synaptics_detect(psmouse, 0))
return -1;
if (synaptics_query_hardware(psmouse)) {
printk(KERN_ERR "Unable to query Synaptics hardware.\n");
return -1;
}
if (old_priv.identity != priv->identity ||
old_priv.model_id != priv->model_id ||
old_priv.capabilities != priv->capabilities ||
old_priv.ext_cap != priv->ext_cap)
return -1;
if (synaptics_set_absolute_mode(psmouse)) {
printk(KERN_ERR "Unable to initialize Synaptics hardware.\n");
return -1;
}
return 0;
}
int synaptics_detect(struct psmouse *psmouse, int set_properties)
{
struct ps2dev *ps2dev = &psmouse->ps2dev;
unsigned char param[4];
param[0] = 0;
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
if (param[1] != 0x47)
return -1;
if (set_properties) {
psmouse->vendor = "Synaptics";
psmouse->name = "TouchPad";
}
return 0;
}
#if defined(__i386__)
#include <linux/dmi.h>
static struct dmi_system_id toshiba_dmi_table[] = {
{
.ident = "Toshiba Satellite",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
DMI_MATCH(DMI_PRODUCT_NAME , "Satellite"),
},
},
{ }
};
#endif
int synaptics_init(struct psmouse *psmouse)
{
struct synaptics_data *priv;
psmouse->private = priv = kmalloc(sizeof(struct synaptics_data), GFP_KERNEL);
if (!priv)
return -1;
memset(priv, 0, sizeof(struct synaptics_data));
if (synaptics_query_hardware(psmouse)) {
printk(KERN_ERR "Unable to query Synaptics hardware.\n");
goto init_fail;
}
if (synaptics_set_absolute_mode(psmouse)) {
printk(KERN_ERR "Unable to initialize Synaptics hardware.\n");
goto init_fail;
}
priv->pkt_type = SYN_MODEL_NEWABS(priv->model_id) ? SYN_NEWABS : SYN_OLDABS;
print_ident(priv);
set_input_params(&psmouse->dev, priv);
psmouse->protocol_handler = synaptics_process_byte;
psmouse->set_rate = synaptics_set_rate;
psmouse->disconnect = synaptics_disconnect;
psmouse->reconnect = synaptics_reconnect;
psmouse->pktsize = 6;
if (SYN_CAP_PASS_THROUGH(priv->capabilities))
synaptics_pt_create(psmouse);
#if defined(__i386__)
/*
* Toshiba's KBC seems to have trouble handling data from
* Synaptics as full rate, switch to lower rate which is roughly
* thye same as rate of standard PS/2 mouse.
*/
if (psmouse->rate >= 80 && dmi_check_system(toshiba_dmi_table)) {
printk(KERN_INFO "synaptics: Toshiba Satellite detected, limiting rate to 40pps.\n");
psmouse->rate = 40;
}
#endif
return 0;
init_fail:
kfree(priv);
return -1;
}
