[PATCH] Driver for Apple Cinema Display (069e8a65) · Commits · 戴 / test

drivers/usb/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -61,6 +61,7 @@ obj-$(CONFIG_USB_TEST) += misc/
		obj-$(CONFIG_USB_USS720) += misc/
		obj-$(CONFIG_USB_PHIDGETSERVO) += misc/
		obj-$(CONFIG_USB_SISUSBVGA) += misc/
		obj-$(CONFIG_USB_APPLEDISPLAY) += misc/

		obj-$(CONFIG_USB_ATM) += atm/
		obj-$(CONFIG_USB_SPEEDTOUCH) += atm/

drivers/usb/misc/Kconfig

+9 −0

Original line number	Diff line number	Diff line
		@@ -137,6 +137,15 @@ config USB_IDMOUSE

		See also <http://www.fs.tum.de/~echtler/idmouse/>.

		config USB_APPLEDISPLAY
		tristate "Apple Cinema Display support"
		depends on USB
		select BACKLIGHT_LCD_SUPPORT
		select BACKLIGHT_CLASS_DEVICE
		help
		Say Y here if you want to control the backlight of Apple Cinema
		Displays over USB. This driver provides a sysfs interface.

		source "drivers/usb/misc/sisusbvga/Kconfig"

		config USB_LD

drivers/usb/misc/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -17,6 +17,7 @@ obj-$(CONFIG_USB_PHIDGETSERVO) += phidgetservo.o
		obj-$(CONFIG_USB_RIO500) += rio500.o
		obj-$(CONFIG_USB_TEST) += usbtest.o
		obj-$(CONFIG_USB_USS720) += uss720.o
		obj-$(CONFIG_USB_APPLEDISPLAY) += appledisplay.o

		obj-$(CONFIG_USB_SISUSBVGA) += sisusbvga/

drivers/usb/misc/appledisplay.c

0 → 100644

+383 −0

Original line number	Diff line number	Diff line
		/*
		* Apple Cinema Display driver
		*
		* Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
		*
		* Thanks to Caskey L. Dickson for his work with acdctl.
		*
		* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
		*/

		#include <linux/config.h>
		#include <linux/kernel.h>
		#include <linux/errno.h>
		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/usb.h>
		#include <linux/backlight.h>
		#include <linux/timer.h>
		#include <linux/workqueue.h>
		#include <asm/atomic.h>
		#include <asm/semaphore.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 struct usb_device_id appledisplay_table [] = {
		{ APPLEDISPLAY_DEVICE(0x9218) },
		{ APPLEDISPLAY_DEVICE(0x9219) },
		{ APPLEDISPLAY_DEVICE(0x921d) },

		/* 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 */
		char urbdata; / interrupt URB data buffer */
		char msgdata; / control message data buffer */

		struct work_struct work;
		int button_pressed;
		spinlock_t lock;
		};

		static atomic_t count_displays = ATOMIC_INIT(0);
		static struct workqueue_struct *wq;

		static void appledisplay_complete(struct urb urb, struct pt_regs regs)
		{
		struct appledisplay *pdata = urb->context;
		unsigned long flags;
		int retval;

		switch (urb->status) {
		case 0:
		/* success */
		break;
		case -EOVERFLOW:
		printk(KERN_ERR "appletouch: OVERFLOW with data "
		"length %d, actual length is %d\n",
		ACD_URB_BUFFER_LEN, pdata->urb->actual_length);
		case -ECONNRESET:
		case -ENOENT:
		case -ESHUTDOWN:
		/* This urb is terminated, clean up */
		dbg("%s - urb shutting down with status: %d",
		__FUNCTION__, urb->status);
		return;
		default:
		dbg("%s - nonzero urb status received: %d",
		__FUNCTION__, urb->status);
		goto exit;
		}

		spin_lock_irqsave(&pdata->lock, flags);

		switch(pdata->urbdata[1]) {
		case ACD_BTN_BRIGHT_UP:
		case ACD_BTN_BRIGHT_DOWN:
		pdata->button_pressed = 1;
		queue_work(wq, &pdata->work);
		break;
		case ACD_BTN_NONE:
		default:
		pdata->button_pressed = 0;
		break;
		}

		spin_unlock_irqrestore(&pdata->lock, flags);

		exit:
		retval = usb_submit_urb(pdata->urb, GFP_ATOMIC);
		if (retval) {
		err("%s - usb_submit_urb failed with result %d",
		__FUNCTION__, retval);
		}
		}

		static int appledisplay_bl_update_status(struct backlight_device *bd)
		{
		struct appledisplay *pdata = class_get_devdata(&bd->class_dev);
		int retval;

		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);

		return retval;
		}

		static int appledisplay_bl_get_brightness(struct backlight_device *bd)
		{
		struct appledisplay *pdata = class_get_devdata(&bd->class_dev);
		int retval;

		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 < 0)
		return retval;
		else
		return pdata->msgdata[1];
		}

		static struct backlight_properties appledisplay_bl_data = {
		.owner = THIS_MODULE,
		.get_brightness = appledisplay_bl_get_brightness,
		.update_status = appledisplay_bl_update_status,
		.max_brightness = 0xFF
		};

		static void appledisplay_work(void *private)
		{
		struct appledisplay *pdata = private;
		int retval;

		up(&pdata->bd->sem);
		retval = appledisplay_bl_get_brightness(pdata->bd);
		if (retval >= 0)
		pdata->bd->props->brightness = retval;
		down(&pdata->bd->sem);

		/* 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 appledisplay *pdata;
		struct usb_device *udev = interface_to_usbdev(iface);
		struct usb_host_interface *iface_desc;
		struct usb_endpoint_descriptor *endpoint;
		int int_in_endpointAddr = 0;
		int i, retval = -ENOMEM, brightness;
		char bl_name[20];

		/* set up the endpoint information */
		/* use only the first interrupt-in endpoint */
		iface_desc = iface->cur_altsetting;
		for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
		endpoint = &iface_desc->endpoint[i].desc;
		if (!int_in_endpointAddr &&
		(endpoint->bEndpointAddress & USB_DIR_IN) &&
		((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
		USB_ENDPOINT_XFER_INT)) {
		/* we found an interrupt in endpoint */
		int_in_endpointAddr = endpoint->bEndpointAddress;
		break;
		}
		}
		if (!int_in_endpointAddr) {
		err("Could not find int-in endpoint");
		return -EIO;
		}

		/* allocate memory for our device state and initialize it */
		pdata = kzalloc(sizeof(struct appledisplay), GFP_KERNEL);
		if (!pdata) {
		retval = -ENOMEM;
		err("Out of memory");
		goto error;
		}

		pdata->udev = udev;

		spin_lock_init(&pdata->lock);
		INIT_WORK(&pdata->work, appledisplay_work, pdata);

		/* Allocate buffer for control messages */
		pdata->msgdata = kmalloc(ACD_MSG_BUFFER_LEN, GFP_KERNEL);
		if (!pdata->msgdata) {
		retval = -ENOMEM;
		err("appledisplay: Allocating buffer for control messages "
		"failed");
		goto error;
		}

		/* Allocate interrupt URB */
		pdata->urb = usb_alloc_urb(0, GFP_KERNEL);
		if (!pdata->urb) {
		retval = -ENOMEM;
		err("appledisplay: Allocating URB failed");
		goto error;
		}

		/* Allocate buffer for interrupt data */
		pdata->urbdata = usb_buffer_alloc(pdata->udev, ACD_URB_BUFFER_LEN,
		GFP_KERNEL, &pdata->urb->transfer_dma);
		if (!pdata->urbdata) {
		retval = -ENOMEM;
		err("appledisplay: Allocating URB buffer failed");
		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);
		if (usb_submit_urb(pdata->urb, GFP_KERNEL)) {
		retval = -EIO;
		err("appledisplay: Submitting URB failed");
		goto error;
		}

		/* Register backlight device */
		snprintf(bl_name, sizeof(bl_name), "appledisplay%d",
		atomic_inc_return(&count_displays) - 1);
		pdata->bd = backlight_device_register(bl_name, pdata,
		&appledisplay_bl_data);
		if (IS_ERR(pdata->bd)) {
		err("appledisplay: Backlight registration failed");
		goto error;
		}

		/* Try to get brightness */
		up(&pdata->bd->sem);
		brightness = appledisplay_bl_get_brightness(pdata->bd);
		down(&pdata->bd->sem);

		if (brightness < 0) {
		retval = brightness;
		err("appledisplay: Error while getting initial brightness: %d", retval);
		goto error;
		}

		/* Set brightness in backlight device */
		up(&pdata->bd->sem);
		pdata->bd->props->brightness = brightness;
		down(&pdata->bd->sem);

		/* 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);
		if (pdata->urbdata)
		usb_buffer_free(pdata->udev, ACD_URB_BUFFER_LEN,
		pdata->urbdata, pdata->urb->transfer_dma);
		usb_free_urb(pdata->urb);
		}
		if (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(&pdata->work);
		backlight_device_unregister(pdata->bd);
		usb_buffer_free(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,
		};

		static int __init appledisplay_init(void)
		{
		wq = create_singlethread_workqueue("appledisplay");
		if (!wq) {
		err("Could not create work queue\n");
		return -ENOMEM;
		}

		return usb_register(&appledisplay_driver);
		}

		static void __exit appledisplay_exit(void)
		{
		flush_workqueue(wq);
		destroy_workqueue(wq);
		usb_deregister(&appledisplay_driver);
		}

		MODULE_AUTHOR("Michael Hanselmann");
		MODULE_DESCRIPTION("Apple Cinema Display driver");
		MODULE_LICENSE("GPL");

		module_init(appledisplay_init);
		module_exit(appledisplay_exit);

Admin message