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linux/drivers/usb/misc/appledisplay.c
Linus Torvalds bf4afc53b7 Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 
This was done entirely with mindless brute force, using

    git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' |
        xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/'

to convert the new alloc_obj() users that had a simple GFP_KERNEL
argument to just drop that argument.

Note that due to the extreme simplicity of the scripting, any slightly
more complex cases spread over multiple lines would not be triggered:
they definitely exist, but this covers the vast bulk of the cases, and
the resulting diff is also then easier to check automatically.

For the same reason the 'flex' versions will be done as a separate
conversion.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2026-02-21 17:09:51 -08:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Apple Cinema Display driver
*
* Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
*
* Thanks to Caskey L. Dickson for his work with acdctl.
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/backlight.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/atomic.h>
#define APPLE_VENDOR_ID 0x05AC
#define USB_REQ_GET_REPORT 0x01
#define USB_REQ_SET_REPORT 0x09
#define ACD_USB_TIMEOUT 250
#define ACD_USB_EDID 0x0302
#define ACD_USB_BRIGHTNESS 0x0310
#define ACD_BTN_NONE 0
#define ACD_BTN_BRIGHT_UP 3
#define ACD_BTN_BRIGHT_DOWN 4
#define ACD_URB_BUFFER_LEN 2
#define ACD_MSG_BUFFER_LEN 2
#define APPLEDISPLAY_DEVICE(prod) \
.match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
USB_DEVICE_ID_MATCH_INT_CLASS | \
USB_DEVICE_ID_MATCH_INT_PROTOCOL, \
.idVendor = APPLE_VENDOR_ID, \
.idProduct = (prod), \
.bInterfaceClass = USB_CLASS_HID, \
.bInterfaceProtocol = 0x00
/* table of devices that work with this driver */
static const struct usb_device_id appledisplay_table[] = {
{ APPLEDISPLAY_DEVICE(0x9218) },
{ APPLEDISPLAY_DEVICE(0x9219) },
{ APPLEDISPLAY_DEVICE(0x921c) },
{ APPLEDISPLAY_DEVICE(0x921d) },
{ APPLEDISPLAY_DEVICE(0x9222) },
{ APPLEDISPLAY_DEVICE(0x9226) },
{ APPLEDISPLAY_DEVICE(0x9236) },
/* Terminating entry */
{ }
};
MODULE_DEVICE_TABLE(usb, appledisplay_table);
/* Structure to hold all of our device specific stuff */
struct appledisplay {
struct usb_device *udev; /* usb device */
struct urb *urb; /* usb request block */
struct backlight_device *bd; /* backlight device */
u8 *urbdata; /* interrupt URB data buffer */
u8 *msgdata; /* control message data buffer */
struct delayed_work work;
int button_pressed;
struct mutex sysfslock; /* concurrent read and write */
};
static atomic_t count_displays = ATOMIC_INIT(0);
static void appledisplay_complete(struct urb *urb)
{
struct appledisplay *pdata = urb->context;
struct device *dev = &pdata->udev->dev;
int status = urb->status;
int retval;
switch (status) {
case 0:
/* success */
break;
case -EOVERFLOW:
dev_err(dev,
"OVERFLOW with data length %d, actual length is %d\n",
ACD_URB_BUFFER_LEN, pdata->urb->actual_length);
fallthrough;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* This urb is terminated, clean up */
dev_dbg(dev, "%s - urb shuttingdown with status: %d\n",
__func__, status);
return;
default:
dev_dbg(dev, "%s - nonzero urb status received: %d\n",
__func__, status);
goto exit;
}
switch(pdata->urbdata[1]) {
case ACD_BTN_BRIGHT_UP:
case ACD_BTN_BRIGHT_DOWN:
pdata->button_pressed = 1;
/*
* there is a window during which no device
* is registered
*/
if (pdata->bd )
schedule_delayed_work(&pdata->work, 0);
break;
case ACD_BTN_NONE:
default:
pdata->button_pressed = 0;
break;
}
exit:
retval = usb_submit_urb(pdata->urb, GFP_ATOMIC);
if (retval) {
dev_err(dev, "%s - usb_submit_urb failed with result %d\n",
__func__, retval);
}
}
static int appledisplay_bl_update_status(struct backlight_device *bd)
{
struct appledisplay *pdata = bl_get_data(bd);
int retval;
mutex_lock(&pdata->sysfslock);
pdata->msgdata[0] = 0x10;
pdata->msgdata[1] = bd->props.brightness;
retval = usb_control_msg(
pdata->udev,
usb_sndctrlpipe(pdata->udev, 0),
USB_REQ_SET_REPORT,
USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
ACD_USB_BRIGHTNESS,
0,
pdata->msgdata, 2,
ACD_USB_TIMEOUT);
mutex_unlock(&pdata->sysfslock);
if (retval < 0)
return retval;
else
return 0;
}
static int appledisplay_bl_get_brightness(struct backlight_device *bd)
{
struct appledisplay *pdata = bl_get_data(bd);
int retval, brightness;
mutex_lock(&pdata->sysfslock);
retval = usb_control_msg(
pdata->udev,
usb_rcvctrlpipe(pdata->udev, 0),
USB_REQ_GET_REPORT,
USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
ACD_USB_BRIGHTNESS,
0,
pdata->msgdata, 2,
ACD_USB_TIMEOUT);
if (retval < 2) {
if (retval >= 0)
retval = -EMSGSIZE;
} else {
brightness = pdata->msgdata[1];
}
mutex_unlock(&pdata->sysfslock);
if (retval < 0)
return retval;
else
return brightness;
}
static const struct backlight_ops appledisplay_bl_data = {
.get_brightness = appledisplay_bl_get_brightness,
.update_status = appledisplay_bl_update_status,
};
static void appledisplay_work(struct work_struct *work)
{
struct appledisplay *pdata =
container_of(work, struct appledisplay, work.work);
int retval;
retval = appledisplay_bl_get_brightness(pdata->bd);
if (retval >= 0)
pdata->bd->props.brightness = retval;
/* Poll again in about 125ms if there's still a button pressed */
if (pdata->button_pressed)
schedule_delayed_work(&pdata->work, HZ / 8);
}
static int appledisplay_probe(struct usb_interface *iface,
const struct usb_device_id *id)
{
struct backlight_properties props;
struct backlight_device *backlight;
struct appledisplay *pdata;
struct usb_device *udev = interface_to_usbdev(iface);
struct usb_endpoint_descriptor *endpoint;
int int_in_endpointAddr = 0;
int retval, brightness;
char bl_name[20];
/* set up the endpoint information */
/* use only the first interrupt-in endpoint */
retval = usb_find_int_in_endpoint(iface->cur_altsetting, &endpoint);
if (retval) {
dev_err(&iface->dev, "Could not find int-in endpoint\n");
return retval;
}
int_in_endpointAddr = endpoint->bEndpointAddress;
/* allocate memory for our device state and initialize it */
pdata = kzalloc_obj(struct appledisplay);
if (!pdata) {
retval = -ENOMEM;
goto error;
}
pdata->udev = udev;
INIT_DELAYED_WORK(&pdata->work, appledisplay_work);
mutex_init(&pdata->sysfslock);
/* Allocate buffer for control messages */
pdata->msgdata = kmalloc(ACD_MSG_BUFFER_LEN, GFP_KERNEL);
if (!pdata->msgdata) {
retval = -ENOMEM;
goto error;
}
/* Allocate interrupt URB */
pdata->urb = usb_alloc_urb(0, GFP_KERNEL);
if (!pdata->urb) {
retval = -ENOMEM;
goto error;
}
/* Allocate buffer for interrupt data */
pdata->urbdata = usb_alloc_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
GFP_KERNEL, &pdata->urb->transfer_dma);
if (!pdata->urbdata) {
retval = -ENOMEM;
dev_err(&iface->dev, "Allocating URB buffer failed\n");
goto error;
}
/* Configure interrupt URB */
usb_fill_int_urb(pdata->urb, udev,
usb_rcvintpipe(udev, int_in_endpointAddr),
pdata->urbdata, ACD_URB_BUFFER_LEN, appledisplay_complete,
pdata, 1);
pdata->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
if (usb_submit_urb(pdata->urb, GFP_KERNEL)) {
retval = -EIO;
dev_err(&iface->dev, "Submitting URB failed\n");
goto error;
}
/* Register backlight device */
snprintf(bl_name, sizeof(bl_name), "appledisplay%d",
atomic_inc_return(&count_displays) - 1);
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = 0xff;
backlight = backlight_device_register(bl_name, NULL, pdata,
&appledisplay_bl_data, &props);
if (IS_ERR(backlight)) {
dev_err(&iface->dev, "Backlight registration failed\n");
retval = PTR_ERR(backlight);
goto error;
}
pdata->bd = backlight;
/* Try to get brightness */
brightness = appledisplay_bl_get_brightness(pdata->bd);
if (brightness < 0) {
retval = brightness;
dev_err(&iface->dev,
"Error while getting initial brightness: %d\n", retval);
goto error;
}
/* Set brightness in backlight device */
pdata->bd->props.brightness = brightness;
/* save our data pointer in the interface device */
usb_set_intfdata(iface, pdata);
printk(KERN_INFO "appledisplay: Apple Cinema Display connected\n");
return 0;
error:
if (pdata) {
if (pdata->urb) {
usb_kill_urb(pdata->urb);
cancel_delayed_work_sync(&pdata->work);
usb_free_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
pdata->urbdata, pdata->urb->transfer_dma);
usb_free_urb(pdata->urb);
}
if (!IS_ERR(pdata->bd))
backlight_device_unregister(pdata->bd);
kfree(pdata->msgdata);
}
usb_set_intfdata(iface, NULL);
kfree(pdata);
return retval;
}
static void appledisplay_disconnect(struct usb_interface *iface)
{
struct appledisplay *pdata = usb_get_intfdata(iface);
if (pdata) {
usb_kill_urb(pdata->urb);
cancel_delayed_work_sync(&pdata->work);
backlight_device_unregister(pdata->bd);
usb_free_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
pdata->urbdata, pdata->urb->transfer_dma);
usb_free_urb(pdata->urb);
kfree(pdata->msgdata);
kfree(pdata);
}
printk(KERN_INFO "appledisplay: Apple Cinema Display disconnected\n");
}
static struct usb_driver appledisplay_driver = {
.name = "appledisplay",
.probe = appledisplay_probe,
.disconnect = appledisplay_disconnect,
.id_table = appledisplay_table,
};
module_usb_driver(appledisplay_driver);
MODULE_AUTHOR("Michael Hanselmann");
MODULE_DESCRIPTION("Apple Cinema Display driver");
MODULE_LICENSE("GPL");
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