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349 lines
8.7 KiB
349 lines
8.7 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Apple Cinema Display driver |
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* |
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* Copyright (C) 2006 Michael Hanselmann ([email protected]) |
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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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#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 <linux/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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{ APPLEDISPLAY_DEVICE(0x9222) }, |
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{ APPLEDISPLAY_DEVICE(0x9226) }, |
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{ APPLEDISPLAY_DEVICE(0x9236) }, |
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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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struct mutex sysfslock; /* concurrent read and write */ |
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}; |
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static atomic_t count_displays = ATOMIC_INIT(0); |
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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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struct device *dev = &pdata->udev->dev; |
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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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dev_err(dev, |
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"OVERFLOW with data length %d, actual length is %d\n", |
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ACD_URB_BUFFER_LEN, pdata->urb->actual_length); |
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fallthrough; |
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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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dev_dbg(dev, "%s - urb shuttingdown with status: %d\n", |
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__func__, status); |
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return; |
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default: |
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dev_dbg(dev, "%s - nonzero urb status received: %d\n", |
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__func__, status); |
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goto exit; |
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} |
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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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schedule_delayed_work(&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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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(dev, "%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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mutex_lock(&pdata->sysfslock); |
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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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mutex_unlock(&pdata->sysfslock); |
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if (retval < 0) |
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return retval; |
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else |
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return 0; |
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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, brightness; |
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mutex_lock(&pdata->sysfslock); |
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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 < 2) { |
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if (retval >= 0) |
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retval = -EMSGSIZE; |
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} else { |
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brightness = pdata->msgdata[1]; |
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} |
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mutex_unlock(&pdata->sysfslock); |
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if (retval < 0) |
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return retval; |
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else |
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return brightness; |
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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_endpoint_descriptor *endpoint; |
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int int_in_endpointAddr = 0; |
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int retval, 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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retval = usb_find_int_in_endpoint(iface->cur_altsetting, &endpoint); |
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if (retval) { |
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dev_err(&iface->dev, "Could not find int-in endpoint\n"); |
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return retval; |
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} |
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int_in_endpointAddr = endpoint->bEndpointAddress; |
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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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goto error; |
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} |
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pdata->udev = udev; |
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INIT_DELAYED_WORK(&pdata->work, appledisplay_work); |
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mutex_init(&pdata->sysfslock); |
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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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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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goto error; |
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} |
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/* Allocate buffer for interrupt data */ |
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pdata->urbdata = usb_alloc_coherent(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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pdata->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
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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.type = BACKLIGHT_RAW; |
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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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cancel_delayed_work_sync(&pdata->work); |
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usb_free_coherent(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 (!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_sync(&pdata->work); |
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backlight_device_unregister(pdata->bd); |
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usb_free_coherent(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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module_usb_driver(appledisplay_driver); |
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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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