381 lines
9.7 KiB
C
381 lines
9.7 KiB
C
/*
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* Apple Cinema Display driver
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*
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* Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
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*
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* Thanks to Caskey L. Dickson for his work with acdctl.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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#include <linux/backlight.h>
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#include <linux/timer.h>
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#include <linux/workqueue.h>
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#include <asm/atomic.h>
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#define APPLE_VENDOR_ID 0x05AC
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#define USB_REQ_GET_REPORT 0x01
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#define USB_REQ_SET_REPORT 0x09
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#define ACD_USB_TIMEOUT 250
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#define ACD_USB_EDID 0x0302
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#define ACD_USB_BRIGHTNESS 0x0310
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#define ACD_BTN_NONE 0
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#define ACD_BTN_BRIGHT_UP 3
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#define ACD_BTN_BRIGHT_DOWN 4
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#define ACD_URB_BUFFER_LEN 2
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#define ACD_MSG_BUFFER_LEN 2
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#define APPLEDISPLAY_DEVICE(prod) \
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.match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
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USB_DEVICE_ID_MATCH_INT_CLASS | \
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USB_DEVICE_ID_MATCH_INT_PROTOCOL, \
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.idVendor = APPLE_VENDOR_ID, \
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.idProduct = (prod), \
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.bInterfaceClass = USB_CLASS_HID, \
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.bInterfaceProtocol = 0x00
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/* table of devices that work with this driver */
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static const struct usb_device_id appledisplay_table[] = {
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{ APPLEDISPLAY_DEVICE(0x9218) },
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{ APPLEDISPLAY_DEVICE(0x9219) },
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{ APPLEDISPLAY_DEVICE(0x921c) },
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{ APPLEDISPLAY_DEVICE(0x921d) },
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/* Terminating entry */
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{ }
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};
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MODULE_DEVICE_TABLE(usb, appledisplay_table);
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/* Structure to hold all of our device specific stuff */
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struct appledisplay {
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struct usb_device *udev; /* usb device */
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struct urb *urb; /* usb request block */
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struct backlight_device *bd; /* backlight device */
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u8 *urbdata; /* interrupt URB data buffer */
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u8 *msgdata; /* control message data buffer */
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struct delayed_work work;
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int button_pressed;
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spinlock_t lock;
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};
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static atomic_t count_displays = ATOMIC_INIT(0);
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static struct workqueue_struct *wq;
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static void appledisplay_complete(struct urb *urb)
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{
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struct appledisplay *pdata = urb->context;
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unsigned long flags;
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int status = urb->status;
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int retval;
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switch (status) {
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case 0:
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/* success */
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break;
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case -EOVERFLOW:
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printk(KERN_ERR "appletouch: OVERFLOW with data "
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"length %d, actual length is %d\n",
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ACD_URB_BUFFER_LEN, pdata->urb->actual_length);
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* This urb is terminated, clean up */
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dbg("%s - urb shuttingdown with status: %d",
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__func__, status);
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return;
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default:
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dbg("%s - nonzero urb status received: %d",
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__func__, status);
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goto exit;
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}
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spin_lock_irqsave(&pdata->lock, flags);
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switch(pdata->urbdata[1]) {
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case ACD_BTN_BRIGHT_UP:
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case ACD_BTN_BRIGHT_DOWN:
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pdata->button_pressed = 1;
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queue_delayed_work(wq, &pdata->work, 0);
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break;
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case ACD_BTN_NONE:
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default:
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pdata->button_pressed = 0;
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break;
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}
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spin_unlock_irqrestore(&pdata->lock, flags);
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exit:
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retval = usb_submit_urb(pdata->urb, GFP_ATOMIC);
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if (retval) {
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dev_err(&pdata->udev->dev,
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"%s - usb_submit_urb failed with result %d\n",
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__func__, retval);
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}
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}
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static int appledisplay_bl_update_status(struct backlight_device *bd)
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{
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struct appledisplay *pdata = bl_get_data(bd);
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int retval;
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pdata->msgdata[0] = 0x10;
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pdata->msgdata[1] = bd->props.brightness;
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retval = usb_control_msg(
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pdata->udev,
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usb_sndctrlpipe(pdata->udev, 0),
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USB_REQ_SET_REPORT,
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USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
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ACD_USB_BRIGHTNESS,
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0,
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pdata->msgdata, 2,
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ACD_USB_TIMEOUT);
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return retval;
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}
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static int appledisplay_bl_get_brightness(struct backlight_device *bd)
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{
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struct appledisplay *pdata = bl_get_data(bd);
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int retval;
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retval = usb_control_msg(
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pdata->udev,
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usb_rcvctrlpipe(pdata->udev, 0),
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USB_REQ_GET_REPORT,
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USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
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ACD_USB_BRIGHTNESS,
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0,
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pdata->msgdata, 2,
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ACD_USB_TIMEOUT);
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if (retval < 0)
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return retval;
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else
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return pdata->msgdata[1];
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}
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static const struct backlight_ops appledisplay_bl_data = {
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.get_brightness = appledisplay_bl_get_brightness,
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.update_status = appledisplay_bl_update_status,
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};
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static void appledisplay_work(struct work_struct *work)
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{
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struct appledisplay *pdata =
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container_of(work, struct appledisplay, work.work);
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int retval;
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retval = appledisplay_bl_get_brightness(pdata->bd);
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if (retval >= 0)
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pdata->bd->props.brightness = retval;
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/* Poll again in about 125ms if there's still a button pressed */
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if (pdata->button_pressed)
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schedule_delayed_work(&pdata->work, HZ / 8);
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}
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static int appledisplay_probe(struct usb_interface *iface,
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const struct usb_device_id *id)
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{
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struct backlight_properties props;
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struct appledisplay *pdata;
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struct usb_device *udev = interface_to_usbdev(iface);
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struct usb_host_interface *iface_desc;
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struct usb_endpoint_descriptor *endpoint;
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int int_in_endpointAddr = 0;
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int i, retval = -ENOMEM, brightness;
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char bl_name[20];
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/* set up the endpoint information */
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/* use only the first interrupt-in endpoint */
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iface_desc = iface->cur_altsetting;
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for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
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endpoint = &iface_desc->endpoint[i].desc;
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if (!int_in_endpointAddr && usb_endpoint_is_int_in(endpoint)) {
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/* we found an interrupt in endpoint */
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int_in_endpointAddr = endpoint->bEndpointAddress;
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break;
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}
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}
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if (!int_in_endpointAddr) {
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dev_err(&iface->dev, "Could not find int-in endpoint\n");
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return -EIO;
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}
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/* allocate memory for our device state and initialize it */
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pdata = kzalloc(sizeof(struct appledisplay), GFP_KERNEL);
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if (!pdata) {
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retval = -ENOMEM;
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dev_err(&iface->dev, "Out of memory\n");
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goto error;
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}
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pdata->udev = udev;
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spin_lock_init(&pdata->lock);
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INIT_DELAYED_WORK(&pdata->work, appledisplay_work);
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/* Allocate buffer for control messages */
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pdata->msgdata = kmalloc(ACD_MSG_BUFFER_LEN, GFP_KERNEL);
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if (!pdata->msgdata) {
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retval = -ENOMEM;
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dev_err(&iface->dev,
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"Allocating buffer for control messages failed\n");
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goto error;
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}
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/* Allocate interrupt URB */
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pdata->urb = usb_alloc_urb(0, GFP_KERNEL);
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if (!pdata->urb) {
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retval = -ENOMEM;
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dev_err(&iface->dev, "Allocating URB failed\n");
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goto error;
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}
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/* Allocate buffer for interrupt data */
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pdata->urbdata = usb_buffer_alloc(pdata->udev, ACD_URB_BUFFER_LEN,
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GFP_KERNEL, &pdata->urb->transfer_dma);
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if (!pdata->urbdata) {
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retval = -ENOMEM;
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dev_err(&iface->dev, "Allocating URB buffer failed\n");
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goto error;
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}
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/* Configure interrupt URB */
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usb_fill_int_urb(pdata->urb, udev,
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usb_rcvintpipe(udev, int_in_endpointAddr),
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pdata->urbdata, ACD_URB_BUFFER_LEN, appledisplay_complete,
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pdata, 1);
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if (usb_submit_urb(pdata->urb, GFP_KERNEL)) {
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retval = -EIO;
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dev_err(&iface->dev, "Submitting URB failed\n");
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goto error;
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}
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/* Register backlight device */
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snprintf(bl_name, sizeof(bl_name), "appledisplay%d",
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atomic_inc_return(&count_displays) - 1);
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memset(&props, 0, sizeof(struct backlight_properties));
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props.max_brightness = 0xff;
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pdata->bd = backlight_device_register(bl_name, NULL, pdata,
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&appledisplay_bl_data, &props);
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if (IS_ERR(pdata->bd)) {
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dev_err(&iface->dev, "Backlight registration failed\n");
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retval = PTR_ERR(pdata->bd);
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goto error;
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}
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/* Try to get brightness */
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brightness = appledisplay_bl_get_brightness(pdata->bd);
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if (brightness < 0) {
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retval = brightness;
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dev_err(&iface->dev,
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"Error while getting initial brightness: %d\n", retval);
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goto error;
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}
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/* Set brightness in backlight device */
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pdata->bd->props.brightness = brightness;
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/* save our data pointer in the interface device */
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usb_set_intfdata(iface, pdata);
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printk(KERN_INFO "appledisplay: Apple Cinema Display connected\n");
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return 0;
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error:
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if (pdata) {
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if (pdata->urb) {
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usb_kill_urb(pdata->urb);
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if (pdata->urbdata)
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usb_buffer_free(pdata->udev, ACD_URB_BUFFER_LEN,
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pdata->urbdata, pdata->urb->transfer_dma);
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usb_free_urb(pdata->urb);
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}
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if (pdata->bd && !IS_ERR(pdata->bd))
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backlight_device_unregister(pdata->bd);
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kfree(pdata->msgdata);
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}
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usb_set_intfdata(iface, NULL);
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kfree(pdata);
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return retval;
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}
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static void appledisplay_disconnect(struct usb_interface *iface)
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{
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struct appledisplay *pdata = usb_get_intfdata(iface);
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if (pdata) {
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usb_kill_urb(pdata->urb);
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cancel_delayed_work(&pdata->work);
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backlight_device_unregister(pdata->bd);
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usb_buffer_free(pdata->udev, ACD_URB_BUFFER_LEN,
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pdata->urbdata, pdata->urb->transfer_dma);
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usb_free_urb(pdata->urb);
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kfree(pdata->msgdata);
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kfree(pdata);
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}
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printk(KERN_INFO "appledisplay: Apple Cinema Display disconnected\n");
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}
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static struct usb_driver appledisplay_driver = {
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.name = "appledisplay",
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.probe = appledisplay_probe,
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.disconnect = appledisplay_disconnect,
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.id_table = appledisplay_table,
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};
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static int __init appledisplay_init(void)
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{
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wq = create_singlethread_workqueue("appledisplay");
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if (!wq) {
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printk(KERN_ERR "appledisplay: Could not create work queue\n");
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return -ENOMEM;
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}
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return usb_register(&appledisplay_driver);
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}
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static void __exit appledisplay_exit(void)
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{
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flush_workqueue(wq);
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destroy_workqueue(wq);
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usb_deregister(&appledisplay_driver);
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}
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MODULE_AUTHOR("Michael Hanselmann");
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MODULE_DESCRIPTION("Apple Cinema Display driver");
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MODULE_LICENSE("GPL");
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module_init(appledisplay_init);
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module_exit(appledisplay_exit);
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