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1/*
2 * Apple Cinema Display driver
3 *
4 * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
5 *
6 * Thanks to Caskey L. Dickson for his work with acdctl.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
21 */
22
23#include <linux/kernel.h>
24#include <linux/errno.h>
25#include <linux/init.h>
26#include <linux/module.h>
27#include <linux/slab.h>
28#include <linux/usb.h>
29#include <linux/backlight.h>
30#include <linux/timer.h>
31#include <linux/workqueue.h>
32#include <linux/atomic.h>
33
34#define APPLE_VENDOR_ID 0x05AC
35
36#define USB_REQ_GET_REPORT 0x01
37#define USB_REQ_SET_REPORT 0x09
38
39#define ACD_USB_TIMEOUT 250
40
41#define ACD_USB_EDID 0x0302
42#define ACD_USB_BRIGHTNESS 0x0310
43
44#define ACD_BTN_NONE 0
45#define ACD_BTN_BRIGHT_UP 3
46#define ACD_BTN_BRIGHT_DOWN 4
47
48#define ACD_URB_BUFFER_LEN 2
49#define ACD_MSG_BUFFER_LEN 2
50
51#define APPLEDISPLAY_DEVICE(prod) \
52 .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
53 USB_DEVICE_ID_MATCH_INT_CLASS | \
54 USB_DEVICE_ID_MATCH_INT_PROTOCOL, \
55 .idVendor = APPLE_VENDOR_ID, \
56 .idProduct = (prod), \
57 .bInterfaceClass = USB_CLASS_HID, \
58 .bInterfaceProtocol = 0x00
59
60/* table of devices that work with this driver */
61static const struct usb_device_id appledisplay_table[] = {
62 { APPLEDISPLAY_DEVICE(0x9218) },
63 { APPLEDISPLAY_DEVICE(0x9219) },
64 { APPLEDISPLAY_DEVICE(0x921c) },
65 { APPLEDISPLAY_DEVICE(0x921d) },
66 { APPLEDISPLAY_DEVICE(0x9236) },
67
68 /* Terminating entry */
69 { }
70};
71MODULE_DEVICE_TABLE(usb, appledisplay_table);
72
73/* Structure to hold all of our device specific stuff */
74struct appledisplay {
75 struct usb_device *udev; /* usb device */
76 struct urb *urb; /* usb request block */
77 struct backlight_device *bd; /* backlight device */
78 u8 *urbdata; /* interrupt URB data buffer */
79 u8 *msgdata; /* control message data buffer */
80
81 struct delayed_work work;
82 int button_pressed;
83 spinlock_t lock;
84 struct mutex sysfslock; /* concurrent read and write */
85};
86
87static atomic_t count_displays = ATOMIC_INIT(0);
88static struct workqueue_struct *wq;
89
90static void appledisplay_complete(struct urb *urb)
91{
92 struct appledisplay *pdata = urb->context;
93 struct device *dev = &pdata->udev->dev;
94 unsigned long flags;
95 int status = urb->status;
96 int retval;
97
98 switch (status) {
99 case 0:
100 /* success */
101 break;
102 case -EOVERFLOW:
103 dev_err(dev,
104 "OVERFLOW with data length %d, actual length is %d\n",
105 ACD_URB_BUFFER_LEN, pdata->urb->actual_length);
106 case -ECONNRESET:
107 case -ENOENT:
108 case -ESHUTDOWN:
109 /* This urb is terminated, clean up */
110 dev_dbg(dev, "%s - urb shuttingdown with status: %d\n",
111 __func__, status);
112 return;
113 default:
114 dev_dbg(dev, "%s - nonzero urb status received: %d\n",
115 __func__, status);
116 goto exit;
117 }
118
119 spin_lock_irqsave(&pdata->lock, flags);
120
121 switch(pdata->urbdata[1]) {
122 case ACD_BTN_BRIGHT_UP:
123 case ACD_BTN_BRIGHT_DOWN:
124 pdata->button_pressed = 1;
125 queue_delayed_work(wq, &pdata->work, 0);
126 break;
127 case ACD_BTN_NONE:
128 default:
129 pdata->button_pressed = 0;
130 break;
131 }
132
133 spin_unlock_irqrestore(&pdata->lock, flags);
134
135exit:
136 retval = usb_submit_urb(pdata->urb, GFP_ATOMIC);
137 if (retval) {
138 dev_err(dev, "%s - usb_submit_urb failed with result %d\n",
139 __func__, retval);
140 }
141}
142
143static int appledisplay_bl_update_status(struct backlight_device *bd)
144{
145 struct appledisplay *pdata = bl_get_data(bd);
146 int retval;
147
148 mutex_lock(&pdata->sysfslock);
149 pdata->msgdata[0] = 0x10;
150 pdata->msgdata[1] = bd->props.brightness;
151
152 retval = usb_control_msg(
153 pdata->udev,
154 usb_sndctrlpipe(pdata->udev, 0),
155 USB_REQ_SET_REPORT,
156 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
157 ACD_USB_BRIGHTNESS,
158 0,
159 pdata->msgdata, 2,
160 ACD_USB_TIMEOUT);
161 mutex_unlock(&pdata->sysfslock);
162
163 return retval;
164}
165
166static int appledisplay_bl_get_brightness(struct backlight_device *bd)
167{
168 struct appledisplay *pdata = bl_get_data(bd);
169 int retval, brightness;
170
171 mutex_lock(&pdata->sysfslock);
172 retval = usb_control_msg(
173 pdata->udev,
174 usb_rcvctrlpipe(pdata->udev, 0),
175 USB_REQ_GET_REPORT,
176 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
177 ACD_USB_BRIGHTNESS,
178 0,
179 pdata->msgdata, 2,
180 ACD_USB_TIMEOUT);
181 brightness = pdata->msgdata[1];
182 mutex_unlock(&pdata->sysfslock);
183
184 if (retval < 0)
185 return retval;
186 else
187 return brightness;
188}
189
190static const struct backlight_ops appledisplay_bl_data = {
191 .get_brightness = appledisplay_bl_get_brightness,
192 .update_status = appledisplay_bl_update_status,
193};
194
195static void appledisplay_work(struct work_struct *work)
196{
197 struct appledisplay *pdata =
198 container_of(work, struct appledisplay, work.work);
199 int retval;
200
201 retval = appledisplay_bl_get_brightness(pdata->bd);
202 if (retval >= 0)
203 pdata->bd->props.brightness = retval;
204
205 /* Poll again in about 125ms if there's still a button pressed */
206 if (pdata->button_pressed)
207 schedule_delayed_work(&pdata->work, HZ / 8);
208}
209
210static int appledisplay_probe(struct usb_interface *iface,
211 const struct usb_device_id *id)
212{
213 struct backlight_properties props;
214 struct appledisplay *pdata;
215 struct usb_device *udev = interface_to_usbdev(iface);
216 struct usb_host_interface *iface_desc;
217 struct usb_endpoint_descriptor *endpoint;
218 int int_in_endpointAddr = 0;
219 int i, retval = -ENOMEM, brightness;
220 char bl_name[20];
221
222 /* set up the endpoint information */
223 /* use only the first interrupt-in endpoint */
224 iface_desc = iface->cur_altsetting;
225 for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
226 endpoint = &iface_desc->endpoint[i].desc;
227 if (!int_in_endpointAddr && usb_endpoint_is_int_in(endpoint)) {
228 /* we found an interrupt in endpoint */
229 int_in_endpointAddr = endpoint->bEndpointAddress;
230 break;
231 }
232 }
233 if (!int_in_endpointAddr) {
234 dev_err(&iface->dev, "Could not find int-in endpoint\n");
235 return -EIO;
236 }
237
238 /* allocate memory for our device state and initialize it */
239 pdata = kzalloc(sizeof(struct appledisplay), GFP_KERNEL);
240 if (!pdata) {
241 retval = -ENOMEM;
242 dev_err(&iface->dev, "Out of memory\n");
243 goto error;
244 }
245
246 pdata->udev = udev;
247
248 spin_lock_init(&pdata->lock);
249 INIT_DELAYED_WORK(&pdata->work, appledisplay_work);
250 mutex_init(&pdata->sysfslock);
251
252 /* Allocate buffer for control messages */
253 pdata->msgdata = kmalloc(ACD_MSG_BUFFER_LEN, GFP_KERNEL);
254 if (!pdata->msgdata) {
255 retval = -ENOMEM;
256 dev_err(&iface->dev,
257 "Allocating buffer for control messages failed\n");
258 goto error;
259 }
260
261 /* Allocate interrupt URB */
262 pdata->urb = usb_alloc_urb(0, GFP_KERNEL);
263 if (!pdata->urb) {
264 retval = -ENOMEM;
265 dev_err(&iface->dev, "Allocating URB failed\n");
266 goto error;
267 }
268
269 /* Allocate buffer for interrupt data */
270 pdata->urbdata = usb_alloc_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
271 GFP_KERNEL, &pdata->urb->transfer_dma);
272 if (!pdata->urbdata) {
273 retval = -ENOMEM;
274 dev_err(&iface->dev, "Allocating URB buffer failed\n");
275 goto error;
276 }
277
278 /* Configure interrupt URB */
279 usb_fill_int_urb(pdata->urb, udev,
280 usb_rcvintpipe(udev, int_in_endpointAddr),
281 pdata->urbdata, ACD_URB_BUFFER_LEN, appledisplay_complete,
282 pdata, 1);
283 if (usb_submit_urb(pdata->urb, GFP_KERNEL)) {
284 retval = -EIO;
285 dev_err(&iface->dev, "Submitting URB failed\n");
286 goto error;
287 }
288
289 /* Register backlight device */
290 snprintf(bl_name, sizeof(bl_name), "appledisplay%d",
291 atomic_inc_return(&count_displays) - 1);
292 memset(&props, 0, sizeof(struct backlight_properties));
293 props.type = BACKLIGHT_RAW;
294 props.max_brightness = 0xff;
295 pdata->bd = backlight_device_register(bl_name, NULL, pdata,
296 &appledisplay_bl_data, &props);
297 if (IS_ERR(pdata->bd)) {
298 dev_err(&iface->dev, "Backlight registration failed\n");
299 retval = PTR_ERR(pdata->bd);
300 goto error;
301 }
302
303 /* Try to get brightness */
304 brightness = appledisplay_bl_get_brightness(pdata->bd);
305
306 if (brightness < 0) {
307 retval = brightness;
308 dev_err(&iface->dev,
309 "Error while getting initial brightness: %d\n", retval);
310 goto error;
311 }
312
313 /* Set brightness in backlight device */
314 pdata->bd->props.brightness = brightness;
315
316 /* save our data pointer in the interface device */
317 usb_set_intfdata(iface, pdata);
318
319 printk(KERN_INFO "appledisplay: Apple Cinema Display connected\n");
320
321 return 0;
322
323error:
324 if (pdata) {
325 if (pdata->urb) {
326 usb_kill_urb(pdata->urb);
327 if (pdata->urbdata)
328 usb_free_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
329 pdata->urbdata, pdata->urb->transfer_dma);
330 usb_free_urb(pdata->urb);
331 }
332 if (!IS_ERR(pdata->bd))
333 backlight_device_unregister(pdata->bd);
334 kfree(pdata->msgdata);
335 }
336 usb_set_intfdata(iface, NULL);
337 kfree(pdata);
338 return retval;
339}
340
341static void appledisplay_disconnect(struct usb_interface *iface)
342{
343 struct appledisplay *pdata = usb_get_intfdata(iface);
344
345 if (pdata) {
346 usb_kill_urb(pdata->urb);
347 cancel_delayed_work(&pdata->work);
348 backlight_device_unregister(pdata->bd);
349 usb_free_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
350 pdata->urbdata, pdata->urb->transfer_dma);
351 usb_free_urb(pdata->urb);
352 kfree(pdata->msgdata);
353 kfree(pdata);
354 }
355
356 printk(KERN_INFO "appledisplay: Apple Cinema Display disconnected\n");
357}
358
359static struct usb_driver appledisplay_driver = {
360 .name = "appledisplay",
361 .probe = appledisplay_probe,
362 .disconnect = appledisplay_disconnect,
363 .id_table = appledisplay_table,
364};
365
366static int __init appledisplay_init(void)
367{
368 wq = create_singlethread_workqueue("appledisplay");
369 if (!wq) {
370 printk(KERN_ERR "appledisplay: Could not create work queue\n");
371 return -ENOMEM;
372 }
373
374 return usb_register(&appledisplay_driver);
375}
376
377static void __exit appledisplay_exit(void)
378{
379 flush_workqueue(wq);
380 destroy_workqueue(wq);
381 usb_deregister(&appledisplay_driver);
382}
383
384MODULE_AUTHOR("Michael Hanselmann");
385MODULE_DESCRIPTION("Apple Cinema Display driver");
386MODULE_LICENSE("GPL");
387
388module_init(appledisplay_init);
389module_exit(appledisplay_exit);
1/*
2 * Apple Cinema Display driver
3 *
4 * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
5 *
6 * Thanks to Caskey L. Dickson for his work with acdctl.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
21 */
22
23#include <linux/kernel.h>
24#include <linux/errno.h>
25#include <linux/init.h>
26#include <linux/module.h>
27#include <linux/slab.h>
28#include <linux/usb.h>
29#include <linux/backlight.h>
30#include <linux/timer.h>
31#include <linux/workqueue.h>
32#include <linux/atomic.h>
33
34#define APPLE_VENDOR_ID 0x05AC
35
36#define USB_REQ_GET_REPORT 0x01
37#define USB_REQ_SET_REPORT 0x09
38
39#define ACD_USB_TIMEOUT 250
40
41#define ACD_USB_EDID 0x0302
42#define ACD_USB_BRIGHTNESS 0x0310
43
44#define ACD_BTN_NONE 0
45#define ACD_BTN_BRIGHT_UP 3
46#define ACD_BTN_BRIGHT_DOWN 4
47
48#define ACD_URB_BUFFER_LEN 2
49#define ACD_MSG_BUFFER_LEN 2
50
51#define APPLEDISPLAY_DEVICE(prod) \
52 .match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
53 USB_DEVICE_ID_MATCH_INT_CLASS | \
54 USB_DEVICE_ID_MATCH_INT_PROTOCOL, \
55 .idVendor = APPLE_VENDOR_ID, \
56 .idProduct = (prod), \
57 .bInterfaceClass = USB_CLASS_HID, \
58 .bInterfaceProtocol = 0x00
59
60/* table of devices that work with this driver */
61static const struct usb_device_id appledisplay_table[] = {
62 { APPLEDISPLAY_DEVICE(0x9218) },
63 { APPLEDISPLAY_DEVICE(0x9219) },
64 { APPLEDISPLAY_DEVICE(0x921c) },
65 { APPLEDISPLAY_DEVICE(0x921d) },
66 { APPLEDISPLAY_DEVICE(0x9236) },
67
68 /* Terminating entry */
69 { }
70};
71MODULE_DEVICE_TABLE(usb, appledisplay_table);
72
73/* Structure to hold all of our device specific stuff */
74struct appledisplay {
75 struct usb_device *udev; /* usb device */
76 struct urb *urb; /* usb request block */
77 struct backlight_device *bd; /* backlight device */
78 u8 *urbdata; /* interrupt URB data buffer */
79 u8 *msgdata; /* control message data buffer */
80
81 struct delayed_work work;
82 int button_pressed;
83 spinlock_t lock;
84 struct mutex sysfslock; /* concurrent read and write */
85};
86
87static atomic_t count_displays = ATOMIC_INIT(0);
88
89static void appledisplay_complete(struct urb *urb)
90{
91 struct appledisplay *pdata = urb->context;
92 struct device *dev = &pdata->udev->dev;
93 unsigned long flags;
94 int status = urb->status;
95 int retval;
96
97 switch (status) {
98 case 0:
99 /* success */
100 break;
101 case -EOVERFLOW:
102 dev_err(dev,
103 "OVERFLOW with data length %d, actual length is %d\n",
104 ACD_URB_BUFFER_LEN, pdata->urb->actual_length);
105 case -ECONNRESET:
106 case -ENOENT:
107 case -ESHUTDOWN:
108 /* This urb is terminated, clean up */
109 dev_dbg(dev, "%s - urb shuttingdown with status: %d\n",
110 __func__, status);
111 return;
112 default:
113 dev_dbg(dev, "%s - nonzero urb status received: %d\n",
114 __func__, status);
115 goto exit;
116 }
117
118 spin_lock_irqsave(&pdata->lock, flags);
119
120 switch(pdata->urbdata[1]) {
121 case ACD_BTN_BRIGHT_UP:
122 case ACD_BTN_BRIGHT_DOWN:
123 pdata->button_pressed = 1;
124 schedule_delayed_work(&pdata->work, 0);
125 break;
126 case ACD_BTN_NONE:
127 default:
128 pdata->button_pressed = 0;
129 break;
130 }
131
132 spin_unlock_irqrestore(&pdata->lock, flags);
133
134exit:
135 retval = usb_submit_urb(pdata->urb, GFP_ATOMIC);
136 if (retval) {
137 dev_err(dev, "%s - usb_submit_urb failed with result %d\n",
138 __func__, retval);
139 }
140}
141
142static int appledisplay_bl_update_status(struct backlight_device *bd)
143{
144 struct appledisplay *pdata = bl_get_data(bd);
145 int retval;
146
147 mutex_lock(&pdata->sysfslock);
148 pdata->msgdata[0] = 0x10;
149 pdata->msgdata[1] = bd->props.brightness;
150
151 retval = usb_control_msg(
152 pdata->udev,
153 usb_sndctrlpipe(pdata->udev, 0),
154 USB_REQ_SET_REPORT,
155 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
156 ACD_USB_BRIGHTNESS,
157 0,
158 pdata->msgdata, 2,
159 ACD_USB_TIMEOUT);
160 mutex_unlock(&pdata->sysfslock);
161
162 return retval;
163}
164
165static int appledisplay_bl_get_brightness(struct backlight_device *bd)
166{
167 struct appledisplay *pdata = bl_get_data(bd);
168 int retval, brightness;
169
170 mutex_lock(&pdata->sysfslock);
171 retval = usb_control_msg(
172 pdata->udev,
173 usb_rcvctrlpipe(pdata->udev, 0),
174 USB_REQ_GET_REPORT,
175 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
176 ACD_USB_BRIGHTNESS,
177 0,
178 pdata->msgdata, 2,
179 ACD_USB_TIMEOUT);
180 brightness = pdata->msgdata[1];
181 mutex_unlock(&pdata->sysfslock);
182
183 if (retval < 0)
184 return retval;
185 else
186 return brightness;
187}
188
189static const struct backlight_ops appledisplay_bl_data = {
190 .get_brightness = appledisplay_bl_get_brightness,
191 .update_status = appledisplay_bl_update_status,
192};
193
194static void appledisplay_work(struct work_struct *work)
195{
196 struct appledisplay *pdata =
197 container_of(work, struct appledisplay, work.work);
198 int retval;
199
200 retval = appledisplay_bl_get_brightness(pdata->bd);
201 if (retval >= 0)
202 pdata->bd->props.brightness = retval;
203
204 /* Poll again in about 125ms if there's still a button pressed */
205 if (pdata->button_pressed)
206 schedule_delayed_work(&pdata->work, HZ / 8);
207}
208
209static int appledisplay_probe(struct usb_interface *iface,
210 const struct usb_device_id *id)
211{
212 struct backlight_properties props;
213 struct appledisplay *pdata;
214 struct usb_device *udev = interface_to_usbdev(iface);
215 struct usb_host_interface *iface_desc;
216 struct usb_endpoint_descriptor *endpoint;
217 int int_in_endpointAddr = 0;
218 int i, retval = -ENOMEM, brightness;
219 char bl_name[20];
220
221 /* set up the endpoint information */
222 /* use only the first interrupt-in endpoint */
223 iface_desc = iface->cur_altsetting;
224 for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
225 endpoint = &iface_desc->endpoint[i].desc;
226 if (!int_in_endpointAddr && usb_endpoint_is_int_in(endpoint)) {
227 /* we found an interrupt in endpoint */
228 int_in_endpointAddr = endpoint->bEndpointAddress;
229 break;
230 }
231 }
232 if (!int_in_endpointAddr) {
233 dev_err(&iface->dev, "Could not find int-in endpoint\n");
234 return -EIO;
235 }
236
237 /* allocate memory for our device state and initialize it */
238 pdata = kzalloc(sizeof(struct appledisplay), GFP_KERNEL);
239 if (!pdata) {
240 retval = -ENOMEM;
241 goto error;
242 }
243
244 pdata->udev = udev;
245
246 spin_lock_init(&pdata->lock);
247 INIT_DELAYED_WORK(&pdata->work, appledisplay_work);
248 mutex_init(&pdata->sysfslock);
249
250 /* Allocate buffer for control messages */
251 pdata->msgdata = kmalloc(ACD_MSG_BUFFER_LEN, GFP_KERNEL);
252 if (!pdata->msgdata) {
253 retval = -ENOMEM;
254 goto error;
255 }
256
257 /* Allocate interrupt URB */
258 pdata->urb = usb_alloc_urb(0, GFP_KERNEL);
259 if (!pdata->urb) {
260 retval = -ENOMEM;
261 goto error;
262 }
263
264 /* Allocate buffer for interrupt data */
265 pdata->urbdata = usb_alloc_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
266 GFP_KERNEL, &pdata->urb->transfer_dma);
267 if (!pdata->urbdata) {
268 retval = -ENOMEM;
269 dev_err(&iface->dev, "Allocating URB buffer failed\n");
270 goto error;
271 }
272
273 /* Configure interrupt URB */
274 usb_fill_int_urb(pdata->urb, udev,
275 usb_rcvintpipe(udev, int_in_endpointAddr),
276 pdata->urbdata, ACD_URB_BUFFER_LEN, appledisplay_complete,
277 pdata, 1);
278 if (usb_submit_urb(pdata->urb, GFP_KERNEL)) {
279 retval = -EIO;
280 dev_err(&iface->dev, "Submitting URB failed\n");
281 goto error;
282 }
283
284 /* Register backlight device */
285 snprintf(bl_name, sizeof(bl_name), "appledisplay%d",
286 atomic_inc_return(&count_displays) - 1);
287 memset(&props, 0, sizeof(struct backlight_properties));
288 props.type = BACKLIGHT_RAW;
289 props.max_brightness = 0xff;
290 pdata->bd = backlight_device_register(bl_name, NULL, pdata,
291 &appledisplay_bl_data, &props);
292 if (IS_ERR(pdata->bd)) {
293 dev_err(&iface->dev, "Backlight registration failed\n");
294 retval = PTR_ERR(pdata->bd);
295 goto error;
296 }
297
298 /* Try to get brightness */
299 brightness = appledisplay_bl_get_brightness(pdata->bd);
300
301 if (brightness < 0) {
302 retval = brightness;
303 dev_err(&iface->dev,
304 "Error while getting initial brightness: %d\n", retval);
305 goto error;
306 }
307
308 /* Set brightness in backlight device */
309 pdata->bd->props.brightness = brightness;
310
311 /* save our data pointer in the interface device */
312 usb_set_intfdata(iface, pdata);
313
314 printk(KERN_INFO "appledisplay: Apple Cinema Display connected\n");
315
316 return 0;
317
318error:
319 if (pdata) {
320 if (pdata->urb) {
321 usb_kill_urb(pdata->urb);
322 if (pdata->urbdata)
323 usb_free_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
324 pdata->urbdata, pdata->urb->transfer_dma);
325 usb_free_urb(pdata->urb);
326 }
327 if (!IS_ERR(pdata->bd))
328 backlight_device_unregister(pdata->bd);
329 kfree(pdata->msgdata);
330 }
331 usb_set_intfdata(iface, NULL);
332 kfree(pdata);
333 return retval;
334}
335
336static void appledisplay_disconnect(struct usb_interface *iface)
337{
338 struct appledisplay *pdata = usb_get_intfdata(iface);
339
340 if (pdata) {
341 usb_kill_urb(pdata->urb);
342 cancel_delayed_work_sync(&pdata->work);
343 backlight_device_unregister(pdata->bd);
344 usb_free_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
345 pdata->urbdata, pdata->urb->transfer_dma);
346 usb_free_urb(pdata->urb);
347 kfree(pdata->msgdata);
348 kfree(pdata);
349 }
350
351 printk(KERN_INFO "appledisplay: Apple Cinema Display disconnected\n");
352}
353
354static struct usb_driver appledisplay_driver = {
355 .name = "appledisplay",
356 .probe = appledisplay_probe,
357 .disconnect = appledisplay_disconnect,
358 .id_table = appledisplay_table,
359};
360
361static int __init appledisplay_init(void)
362{
363 return usb_register(&appledisplay_driver);
364}
365
366static void __exit appledisplay_exit(void)
367{
368 usb_deregister(&appledisplay_driver);
369}
370
371MODULE_AUTHOR("Michael Hanselmann");
372MODULE_DESCRIPTION("Apple Cinema Display driver");
373MODULE_LICENSE("GPL");
374
375module_init(appledisplay_init);
376module_exit(appledisplay_exit);