/*
* Apple USB BCM5974 (Macbook Air and Penryn Macbook Pro) multitouch driver
*
* Copyright (C) 2008 Henrik Rydberg (rydberg@euromail.se)
*
* The USB initialization and package decoding was made by
* Scott Shawcroft as part of the touchd user-space driver project:
* Copyright (C) 2008 Scott Shawcroft (scott.shawcroft@gmail.com)
*
* The BCM5974 driver is based on the appletouch driver:
* Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2005 Johannes Berg (johannes@sipsolutions.net)
* Copyright (C) 2005 Stelian Pop (stelian@popies.net)
* Copyright (C) 2005 Frank Arnold (frank@scirocco-5v-turbo.de)
* Copyright (C) 2005 Peter Osterlund (petero2@telia.com)
* Copyright (C) 2005 Michael Hanselmann (linux-kernel@hansmi.ch)
* Copyright (C) 2006 Nicolas Boichat (nicolas@boichat.ch)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/usb/input.h>
#include <linux/hid.h>
#include <linux/mutex.h>
#define USB_VENDOR_ID_APPLE 0x05ac
/* MacbookAir, aka wellspring */
#define USB_DEVICE_ID_APPLE_WELLSPRING_ANSI 0x0223
#define USB_DEVICE_ID_APPLE_WELLSPRING_ISO 0x0224
#define USB_DEVICE_ID_APPLE_WELLSPRING_JIS 0x0225
/* MacbookProPenryn, aka wellspring2 */
#define USB_DEVICE_ID_APPLE_WELLSPRING2_ANSI 0x0230
#define USB_DEVICE_ID_APPLE_WELLSPRING2_ISO 0x0231
#define USB_DEVICE_ID_APPLE_WELLSPRING2_JIS 0x0232
/* Macbook5,1 (unibody), aka wellspring3 */
#define USB_DEVICE_ID_APPLE_WELLSPRING3_ANSI 0x0236
#define USB_DEVICE_ID_APPLE_WELLSPRING3_ISO 0x0237
#define USB_DEVICE_ID_APPLE_WELLSPRING3_JIS 0x0238
#define BCM5974_DEVICE(prod) { \
.match_flags = (USB_DEVICE_ID_MATCH_DEVICE | \
USB_DEVICE_ID_MATCH_INT_CLASS | \
USB_DEVICE_ID_MATCH_INT_PROTOCOL), \
.idVendor = USB_VENDOR_ID_APPLE, \
.idProduct = (prod), \
.bInterfaceClass = USB_INTERFACE_CLASS_HID, \
.bInterfaceProtocol = USB_INTERFACE_PROTOCOL_MOUSE \
}
/* table of devices that work with this driver */
static const struct usb_device_id bcm5974_table[] = {
/* MacbookAir1.1 */
BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING_ANSI),
BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING_ISO),
BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING_JIS),
/* MacbookProPenryn */
BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING2_ANSI),
BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING2_ISO),
BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING2_JIS),
/* Macbook5,1 */
BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING3_ANSI),
BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING3_ISO),
BCM5974_DEVICE(USB_DEVICE_ID_APPLE_WELLSPRING3_JIS),
/* Terminating entry */
{}
};
MODULE_DEVICE_TABLE(usb, bcm5974_table);
MODULE_AUTHOR("Henrik Rydberg");
MODULE_DESCRIPTION("Apple USB BCM5974 multitouch driver");
MODULE_LICENSE("GPL");
#define dprintk(level, format, a...)\
{ if (debug >= level) printk(KERN_DEBUG format, ##a); }
static int debug = 1;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Activate debugging output");
/* button data structure */
struct bt_data {
u8 unknown1; /* constant */
u8 button; /* left button */
u8 rel_x; /* relative x coordinate */
u8 rel_y; /* relative y coordinate */
};
/* trackpad header types */
enum tp_type {
TYPE1, /* plain trackpad */
TYPE2 /* button integrated in trackpad */
};
/* trackpad finger data offsets, le16-aligned */
#define FINGER_TYPE1 (13 * sizeof(__le16))
#define FINGER_TYPE2 (15 * sizeof(__le16))
/* trackpad button data offsets */
#define BUTTON_TYPE2 15
/* list of device capability bits */
#define HAS_INTEGRATED_BUTTON 1
/* trackpad finger structure, le16-aligned */
struct tp_finger {
__le16 origin; /* zero when switching track finger */
__le16 abs_x; /* absolute x coodinate */
__le16 abs_y; /* absolute y coodinate */
__le16 rel_x; /* relative x coodinate */
__le16 rel_y; /* relative y coodinate */
__le16 size_major; /* finger size, major axis? */
__le16 size_minor; /* finger size, minor axis? */
__le16 orientation; /* 16384 when point, else 15 bit angle */
__le16 force_major; /* trackpad force, major axis? */
__le16 force_minor; /* trackpad force, minor axis? */
__le16 unused[3]; /* zeros */
__le16 multi; /* one finger: varies, more fingers: constant */
} __attribute__((packed,aligned(2)));
/* trackpad finger data size, empirically at least ten fingers */
#define SIZEOF_FINGER sizeof(struct tp_finger)
#define SIZEOF_ALL_FINGERS (16 * SIZEOF_FINGER)
#define MAX_FINGER_ORIENTATION 16384
/* device-specific parameters */
struct bcm5974_param {
int dim; /* logical dimension */
int fuzz; /* logical noise value */
int devmin; /* device minimum reading */
int devmax; /* device maximum reading */
};
/* device-specific configuration */
struct bcm5974_config {
int ansi, iso, jis; /* the product id of this device */
int caps; /* device capability bitmask */
int bt_ep; /* the endpoint of the button interface */
int bt_datalen; /* data length of the button interface */
int tp_ep; /* the endpoint of the trackpad interface */
enum tp_type tp_type; /* type of trackpad interface */
int tp_offset; /* offset to trackpad finger data */
int tp_datalen; /* data length of the trackpad interface */
struct bcm5974_param p; /* finger pressure limits */
struct bcm5974_param w; /* finger width limits */
struct bcm5974_param x; /* horizontal limits */
struct bcm5974_param y; /* vertical limits */
};
/* logical device structure */
struct bcm5974 {
char phys[64];
struct usb_device *udev; /* usb device */
struct usb_interface *intf; /* our interface */
struct input_dev *input; /* input dev */
struct bcm5974_config cfg; /* device configuration */
struct mutex pm_mutex; /* serialize access to open/suspend */
int opened; /* 1: opened, 0: closed */
struct urb *bt_urb; /* button usb request block */
struct bt_data *bt_data; /* button transferred data */
struct urb *tp_urb; /* trackpad usb request block */
u8 *tp_data; /* trackpad transferred data */
int fingers; /* number of fingers on trackpad */
};
/* logical dimensions */
#define DIM_PRESSURE 256 /* maximum finger pressure */
#define DIM_WIDTH 16 /* maximum finger width */
#define DIM_X 1280 /* maximum trackpad x value */
#define DIM_Y 800 /* maximum trackpad y value */
/* logical signal quality */
#define SN_PRESSURE 45 /* pressure signal-to-noise ratio */
#define SN_WIDTH 100 /* width signal-to-noise ratio */
#define SN_COORD 250 /* coordinate signal-to-noise ratio */
/* pressure thresholds */
#define PRESSURE_LOW (2 * DIM_PRESSURE / SN_PRESSURE)
#define PRESSURE_HIGH (3 * PRESSURE_LOW)
/* device constants */
static const struct bcm5974_config bcm5974_config_table[] = {
{
USB_DEVICE_ID_APPLE_WELLSPRING_ANSI,
USB_DEVICE_ID_APPLE_WELLSPRING_ISO,
USB_DEVICE_ID_APPLE_WELLSPRING_JIS,
0,
0x84, sizeof(struct bt_data),
0x81, TYPE1, FINGER_TYPE1, FINGER_TYPE1 + SIZEOF_ALL_FINGERS,
{ DIM_PRESSURE, DIM_PRESSURE / SN_PRESSURE, 0, 256 },
{ DIM_WIDTH, DIM_WIDTH / SN_WIDTH, 0, 2048 },
{ DIM_X, DIM_X / SN_COORD, -4824, 5342 },
{ DIM_Y, DIM_Y / SN_COORD, -172, 5820 }
},
{
USB_DEVICE_ID_APPLE_WELLSPRING2_ANSI,
USB_DEVICE_ID_APPLE_WELLSPRING2_ISO,
USB_DEVICE_ID_APPLE_WELLSPRING2_JIS,
0,
0x84, sizeof(struct bt_data),
0x81, TYPE1, FINGER_TYPE1, FINGER_TYPE1 + SIZEOF_ALL_FINGERS,
{ DIM_PRESSURE, DIM_PRESSURE / SN_PRESSURE, 0, 256 },
{ DIM_WIDTH, DIM_WIDTH / SN_WIDTH, 0, 2048 },
{ DIM_X, DIM_X / SN_COORD, -4824, 4824 },
{ DIM_Y, DIM_Y / SN_COORD, -172, 4290 }
},
{
USB_DEVICE_ID_APPLE_WELLSPRING3_ANSI,
USB_DEVICE_ID_APPLE_WELLSPRING3_ISO,
USB_DEVICE_ID_APPLE_WELLSPRING3_JIS,
HAS_INTEGRATED_BUTTON,
0x84, sizeof(struct bt_data),
0x81, TYPE2, FINGER_TYPE2, FINGER_TYPE2 + SIZEOF_ALL_FINGERS,
{ DIM_PRESSURE, DIM_PRESSURE / SN_PRESSURE, 0, 300 },
{ DIM_WIDTH, DIM_WIDTH / SN_WIDTH, 0, 2048 },
{ DIM_X, DIM_X / SN_COORD, -4460, 5166 },
{ DIM_Y, DIM_Y / SN_COORD, -75, 6700 }
},
{}
};
/* return the device-specific configuration by device */
static const struct bcm5974_config *bcm5974_get_config(struct usb_device *udev)
{
u16 id = le16_to_cpu(udev->descriptor.idProduct);
const struct bcm5974_config *cfg;
for (cfg = bcm5974_config_table; cfg->ansi; ++cfg)
if (cfg->ansi == id || cfg->iso == id || cfg->jis == id)
return cfg;
return bcm5974_config_table;
}
/* convert 16-bit little endian to signed integer */
static inline int raw2int(__le16 x)
{
return (signed short)le16_to_cpu(x);
}
/* scale device data to logical dimensions (asserts devmin < devmax) */
static inline int int2scale(const struct bcm5974_param *p, int x)
{
return x * p->dim / (p->devmax - p->devmin);
}
/* all logical value ranges are [0,dim). */
static inline int int2bound(const struct bcm5974_param *p, int x)
{
int s = int2scale(p, x);
return clamp_val(s, 0, p->dim - 1);
}
/* setup which logical events to report */
static void setup_events_to_report(struct input_dev *input_dev,
const struct bcm5974_config *cfg)
{
__set_bit(EV_ABS, input_dev->evbit);
input_set_abs_params(input_dev, ABS_PRESSURE,
0, cfg->p.dim, cfg->p.fuzz, 0);
input_set_abs_params(input_dev, ABS_TOOL_WIDTH,
0, cfg->w.dim, cfg->w.fuzz, 0);
input_set_abs_params(input_dev, ABS_X,
0, cfg->x.dim, cfg->x.fuzz, 0);
input_set_abs_params(input_dev, ABS_Y,
0, cfg->y.dim, cfg->y.fuzz, 0);
/* finger touch area */
input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
cfg->w.devmin, cfg->w.devmax, 0, 0);
input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR,
cfg->w.devmin, cfg->w.devmax, 0, 0);
/* finger approach area */
input_set_abs_params(input_dev, ABS_MT_WIDTH_MAJOR,
cfg->w.devmin, cfg->w.devmax, 0, 0);
input_set_abs_params(input_dev, ABS_MT_WIDTH_MINOR,
cfg->w.devmin, cfg->w.devmax, 0, 0);
/* finger orientation */
input_set_abs_params(input_dev, ABS_MT_ORIENTATION,
-MAX_FINGER_ORIENTATION,
MAX_FINGER_ORIENTATION, 0, 0);
/* finger position */
input_set_abs_params(input_dev, ABS_MT_POSITION_X,
cfg->x.devmin, cfg->x.devmax, 0, 0);
input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
cfg->y.devmin, cfg->y.devmax, 0, 0);
__set_bit(EV_KEY, input_dev->evbit);
__set_bit(BTN_TOUCH, input_dev->keybit);
__set_bit(BTN_TOOL_FINGER, input_dev->keybit);
__set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit);
__set_bit(BTN_TOOL_TRIPLETAP, input_dev->keybit);
__set_bit(BTN_TOOL_QUADTAP, input_dev->keybit);
__set_bit(BTN_LEFT, input_dev->keybit);
input_set_events_per_packet(input_dev, 60);
}
/* report button data as logical button state */
static int report_bt_state(struct bcm5974 *dev, int size)
{
if (size != sizeof(struct bt_data))
return -EIO;
dprintk(7,
"bcm5974: button data: %x %x %x %x\n",
dev->bt_data->unknown1, dev->bt_data->button,
dev->bt_data->rel_x, dev->bt_data->rel_y);
input_report_key(dev->input, BTN_LEFT, dev->bt_data->button);
input_sync(dev->input);
return 0;
}
static void report_finger_data(struct input_dev *input,
const struct bcm5974_config *cfg,
const struct tp_finger *f)
{
input_report_abs(input, ABS_MT_TOUCH_MAJOR, raw2int(f->force_major));
input_report_abs(input, ABS_MT_TOUCH_MINOR, raw2int(f->force_minor));
input_report_abs(input, ABS_MT_WIDTH_MAJOR, raw2int(f->size_major));
input_report_abs(input, ABS_MT_WIDTH_MINOR, raw2int(f->size_minor));
input_report_abs(input, ABS_MT_ORIENTATION,
MAX_FINGER_ORIENTATION - raw2int(f->orientation));
input_report_abs(input, ABS_MT_POSITION_X, raw2int(f->abs_x));
input_report_abs(input, ABS_MT_POSITION_Y,
cfg->y.devmin + cfg->y.devmax - raw2int(f->abs_y));
input_mt_sync(input);
}
/* report trackpad data as logical trackpad state */
static int report_tp_state(struct bcm5974 *dev, int size)
{
const struct bcm5974_config *c = &dev->cfg;
const struct tp_finger *f;
struct input_dev *input = dev->input;
int raw_p, raw_w, raw_x, raw_y, raw_n, i;
int ptest, origin, ibt = 0, nmin = 0, nmax = 0;
int abs_p = 0, abs_w = 0, abs_x = 0, abs_y = 0;
if (size < c->tp_offset || (size - c->tp_offset) % SIZEOF_FINGER != 0)
return -EIO;
/* finger data, le16-aligned */
f = (const struct tp_finger *)(dev->tp_data + c->tp_offset);
raw_n = (size - c->tp_offset) / SIZEOF_FINGER;
/* always track the first finger; when detached, start over */
if (raw_n) {
/* report raw trackpad data */
for (i = 0; i < raw_n; i++)
report_finger_data(input, c, &f[i]);
raw_p = raw2int(f->force_major);
raw_w = raw2int(f->size_major);
raw_x = raw2int(f->abs_x);
raw_y = raw2int(f->abs_y);
dprintk(9,
"bcm5974: "
"raw: p: %+05d w: %+05d x: %+05d y: %+05d n: %d\n",
raw_p, raw_w, raw_x, raw_y, raw_n);
ptest = int2bound(&c->p, raw_p);
origin = raw2int(f->origin);
/* set the integrated button if applicable */
if (c->tp_type == TYPE2)
ibt = raw2int(dev->tp_data[BUTTON_TYPE2]);
/* while tracking finger still valid, count all fingers */
if (ptest > PRESSURE_LOW && origin) {
abs_p = ptest;
abs_w = int2bound(&c->w, raw_w);
abs_x = int2bound(&c->x, raw_x - c->x.devmin);
abs_y = int2bound(&c->y, c->y.devmax - raw_y);
while (raw_n--) {
ptest = int2bound(&c->p,
raw2int(f->force_major));
if (ptest > PRESSURE_LOW)
nmax++;
if (ptest > PRESSURE_HIGH)
nmin++;
f++;
}
}
}
if (dev->fingers < nmin)
dev->fingers = nmin;
if (dev->fingers > nmax)
dev->fingers = nmax;
input_report_key(input, BTN_TOUCH, dev->fingers > 0);
input_report_key(input, BTN_TOOL_FINGER, dev->fingers == 1);
input_report_key(input, BTN_TOOL_DOUBLETAP, dev->fingers == 2);
input_report_key(input, BTN_TOOL_TRIPLETAP, dev->fingers == 3);
input_report_key(input, BTN_TOOL_QUADTAP, dev->fingers > 3);
input_report_abs(input, ABS_PRESSURE, abs_p);
input_report_abs(input, ABS_TOOL_WIDTH, abs_w);
if (abs_p) {
input_report_abs(input, ABS_X, abs_x);
input_report_abs(input, ABS_Y, abs_y);
dprintk(8,
"bcm5974: abs: p: %+05d w: %+05d x: %+05d y: %+05d "
"nmin: %d nmax: %d n: %d ibt: %d\n", abs_p, abs_w,
abs_x, abs_y, nmin, nmax, dev->fingers, ibt);
}
/* type 2 reports button events via ibt only */
if (c->tp_type == TYPE2)
input_report_key(input, BTN_LEFT, ibt);
input_sync(input);
return 0;
}
/* Wellspring initialization constants */
#define BCM5974_WELLSPRING_MODE_READ_REQUEST_ID 1
#define BCM5974_WELLSPRING_MODE_WRITE_REQUEST_ID 9
#define BCM5974_WELLSPRING_MODE_REQUEST_VALUE 0x300
#define BCM5974_WELLSPRING_MODE_REQUEST_INDEX 0
#define BCM5974_WELLSPRING_MODE_VENDOR_VALUE 0x01
#define BCM5974_WELLSPRING_MODE_NORMAL_VALUE 0x08
static int bcm5974_wellspring_mode(struct bcm5974 *dev, bool on)
{
char *data = kmalloc(8, GFP_KERNEL);
int retval = 0, size;
if (!data) {
err("bcm5974: out of memory");
retval = -ENOMEM;
goto out;
}
/* read configuration */
size = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
BCM5974_WELLSPRING_MODE_READ_REQUEST_ID,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
BCM5974_WELLSPRING_MODE_REQUEST_VALUE,
BCM5974_WELLSPRING_MODE_REQUEST_INDEX, data, 8, 5000);
if (size != 8) {
err("bcm5974: could not read from device");
retval = -EIO;
goto out;
}
/* apply the mode switch */
data[0] = on ?
BCM5974_WELLSPRING_MODE_VENDOR_VALUE :
BCM5974_WELLSPRING_MODE_NORMAL_VALUE;
/* write configuration */
size = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
BCM5974_WELLSPRING_MODE_WRITE_REQUEST_ID,
USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
BCM5974_WELLSPRING_MODE_REQUEST_VALUE,
BCM5974_WELLSPRING_MODE_REQUEST_INDEX, data, 8, 5000);
if (size != 8) {
err("bcm5974: could not write to device");
retval = -EIO;
goto out;
}
dprintk(2, "bcm5974: switched to %s mode.\n",
on ? "wellspring" : "normal");
out:
kfree(data);
return retval;
}
static void bcm5974_irq_button(struct urb *urb)
{
struct bcm5974 *dev = urb->context;
int error;
switch (urb->status) {
case 0:
break;
case -EOVERFLOW:
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
dbg("bcm5974: button urb shutting down: %d", urb->status);
return;
default:
dbg("bcm5974: button urb status: %d", urb->status);
goto exit;
}
if (report_bt_state(dev, dev->bt_urb->actual_length))
dprintk(1, "bcm5974: bad button package, length: %d\n",
dev->bt_urb->actual_length);
exit:
error = usb_submit_urb(dev->bt_urb, GFP_ATOMIC);
if (error)
err("bcm5974: button urb failed: %d", error);
}
static void bcm5974_irq_trackpad(struct urb *urb)
{
struct bcm5974 *dev = urb->context;
int error;
switch (urb->status) {
case 0:
break;
case -EOVERFLOW:
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
dbg("bcm5974: trackpad urb shutting down: %d", urb->status);
return;
default:
dbg("bcm5974: trackpad urb status: %d", urb->status);
goto exit;
}
/* control response ignored */
if (dev->tp_urb->actual_length == 2)
goto exit;
if (report_tp_state(dev, dev->tp_urb->actual_length))
dprintk(1, "bcm5974: bad trackpad package, length: %d\n",
dev->tp_urb->actual_length);
exit:
error = usb_submit_urb(dev->tp_urb, GFP_ATOMIC);
if (error)
err("bcm5974: trackpad urb failed: %d", error);
}
/*
* The Wellspring trackpad, like many recent Apple trackpads, share
* the usb device with the keyboard. Since keyboards are usually
* handled by the HID system, the device ends up being handled by two
* modules. Setting up the device therefore becomes slightly
* complicated. To enable multitouch features, a mode switch is
* required, which is usually applied via the control interface of the
* device. It can be argued where this switch should take place. In
* some drivers, like appletouch, the switch is made during
* probe. However, the hid module may also alter the state of the
* device, resulting in trackpad malfunction under certain
* circumstances. To get around this problem, there is at least one
* example that utilizes the USB_QUIRK_RESET_RESUME quirk in order to
* recieve a reset_resume request rather than the normal resume.
* Since the implementation of reset_resume is equal to mode switch
* plus start_traffic, it seems easier to always do the switch when
* starting traffic on the device.
*/
static int bcm5974_start_traffic(struct bcm5974 *dev)
{
int error;
error = bcm5974_wellspring_mode(dev, true);
if (error) {
dprintk(1, "bcm5974: mode switch failed\n");
goto err_out;
}
error = usb_submit_urb(dev->bt_urb, GFP_KERNEL);
if (error)
goto err_reset_mode;
error = usb_submit_urb(dev->tp_urb, GFP_KERNEL);
if (error)
goto err_kill_bt;
return 0;
err_kill_bt:
usb_kill_urb(dev->bt_urb);
err_reset_mode:
bcm5974_wellspring_mode(dev, false);
err_out:
return error;
}
static void bcm5974_pause_traffic(struct bcm5974 *dev)
{
usb_kill_urb(dev->tp_urb);
usb_kill_urb(dev->bt_urb);
bcm5974_wellspring_mode(dev, false);
}
/*
* The code below implements open/close and manual suspend/resume.
* All functions may be called in random order.
*
* Opening a suspended device fails with EACCES - permission denied.
*
* Failing a resume leaves the device resumed but closed.
*/
static int bcm5974_open(struct input_dev *input)
{
struct bcm5974 *dev = input_get_drvdata(input);
int error;
error = usb_autopm_get_interface(dev->intf);
if (error)
return error;
mutex_lock(&dev->pm_mutex);
error = bcm5974_start_traffic(dev);
if (!error)
dev->opened = 1;
mutex_unlock(&dev->pm_mutex);
if (error)
usb_autopm_put_interface(dev->intf);
return error;
}
static void bcm5974_close(struct input_dev *input)
{
struct bcm5974 *dev = input_get_drvdata(input);
mutex_lock(&dev->pm_mutex);
bcm5974_pause_traffic(dev);
dev->opened = 0;
mutex_unlock(&dev->pm_mutex);
usb_autopm_put_interface(dev->intf);
}
static int bcm5974_suspend(struct usb_interface *iface, pm_message_t message)
{
struct bcm5974 *dev = usb_get_intfdata(iface);
mutex_lock(&dev->pm_mutex);
if (dev->opened)
bcm5974_pause_traffic(dev);
mutex_unlock(&dev->pm_mutex);
return 0;
}
static int bcm5974_resume(struct usb_interface *iface)
{
struct bcm5974 *dev = usb_get_intfdata(iface);
int error = 0;
mutex_lock(&dev->pm_mutex);
if (dev->opened)
error = bcm5974_start_traffic(dev);
mutex_unlock(&dev->pm_mutex);
return error;
}
static int bcm5974_probe(struct usb_interface *iface,
const struct usb_device_id *id)
{
struct usb_device *udev = interface_to_usbdev(iface);
const struct bcm5974_config *cfg;
struct bcm5974 *dev;
struct input_dev *input_dev;
int error = -ENOMEM;
/* find the product index */
cfg = bcm5974_get_config(udev);
/* allocate memory for our device state and initialize it */
dev = kzalloc(sizeof(struct bcm5974), GFP_KERNEL);
input_dev = input_allocate_device();
if (!dev || !input_dev) {
err("bcm5974: out of memory");
goto err_free_devs;
}
dev->udev = udev;
dev->intf = iface;
dev->input = input_dev;
dev->cfg = *cfg;
mutex_init(&dev->pm_mutex);
/* setup urbs */
dev->bt_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->bt_urb)
goto err_free_devs;
dev->tp_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->tp_urb)
goto err_free_bt_urb;
dev->bt_data = usb_alloc_coherent(dev->udev,
dev->cfg.bt_datalen, GFP_KERNEL,
&dev->bt_urb->transfer_dma);
if (!dev->bt_data)
goto err_free_urb;
dev->tp_data = usb_alloc_coherent(dev->udev,
dev->cfg.tp_datalen, GFP_KERNEL,
&dev->tp_urb->transfer_dma);
if (!dev->tp_data)
goto err_free_bt_buffer;
usb_fill_int_urb(dev->bt_urb, udev,
usb_rcvintpipe(udev, cfg->bt_ep),
dev->bt_data, dev->cfg.bt_datalen,
bcm5974_irq_button, dev, 1);
usb_fill_int_urb(dev->tp_urb, udev,
usb_rcvintpipe(udev, cfg->tp_ep),
dev->tp_data, dev->cfg.tp_datalen,
bcm5974_irq_trackpad, dev, 1);
/* create bcm5974 device */
usb_make_path(udev, dev->phys, sizeof(dev->phys));
strlcat(dev->phys, "/input0", sizeof(dev->phys));
input_dev->name = "bcm5974";
input_dev->phys = dev->phys;
usb_to_input_id(dev->udev, &input_dev->id);
/* report driver capabilities via the version field */
input_dev->id.version = cfg->caps;
input_dev->dev.parent = &iface->dev;
input_set_drvdata(input_dev, dev);
input_dev->open = bcm5974_open;
input_dev->close = bcm5974_close;
setup_events_to_report(input_dev, cfg);
error = input_register_device(dev->input);
if (error)
goto err_free_buffer;
/* save our data pointer in this interface device */
usb_set_intfdata(iface, dev);
return 0;
err_free_buffer:
usb_free_coherent(dev->udev, dev->cfg.tp_datalen,
dev->tp_data, dev->tp_urb->transfer_dma);
err_free_bt_buffer:
usb_free_coherent(dev->udev, dev->cfg.bt_datalen,
dev->bt_data, dev->bt_urb->transfer_dma);
err_free_urb:
usb_free_urb(dev->tp_urb);
err_free_bt_urb:
usb_free_urb(dev->bt_urb);
err_free_devs:
usb_set_intfdata(iface, NULL);
input_free_device(input_dev);
kfree(dev);
return error;
}
static void bcm5974_disconnect(struct usb_interface *iface)
{
struct bcm5974 *dev = usb_get_intfdata(iface);
usb_set_intfdata(iface, NULL);
input_unregister_device(dev->input);
usb_free_coherent(dev->udev, dev->cfg.tp_datalen,
dev->tp_data, dev->tp_urb->transfer_dma);
usb_free_coherent(dev->udev, dev->cfg.bt_datalen,
dev->bt_data, dev->bt_urb->transfer_dma);
usb_free_urb(dev->tp_urb);
usb_free_urb(dev->bt_urb);
kfree(dev);
}
static struct usb_driver bcm5974_driver = {
.name = "bcm5974",
.probe = bcm5974_probe,
.disconnect = bcm5974_disconnect,
.suspend = bcm5974_suspend,
.resume = bcm5974_resume,
.id_table = bcm5974_table,
.supports_autosuspend = 1,
};
static int __init bcm5974_init(void)
{
return usb_register(&bcm5974_driver);
}
static void __exit bcm5974_exit(void)
{
usb_deregister(&bcm5974_driver);
}
module_init(bcm5974_init);
module_exit(bcm5974_exit);
