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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
67 /* Terminating entry */
68 { }
69};
70MODULE_DEVICE_TABLE(usb, appledisplay_table);
71
72/* Structure to hold all of our device specific stuff */
73struct appledisplay {
74 struct usb_device *udev; /* usb device */
75 struct urb *urb; /* usb request block */
76 struct backlight_device *bd; /* backlight device */
77 u8 *urbdata; /* interrupt URB data buffer */
78 u8 *msgdata; /* control message data buffer */
79
80 struct delayed_work work;
81 int button_pressed;
82 spinlock_t lock;
83};
84
85static atomic_t count_displays = ATOMIC_INIT(0);
86static struct workqueue_struct *wq;
87
88static void appledisplay_complete(struct urb *urb)
89{
90 struct appledisplay *pdata = urb->context;
91 unsigned long flags;
92 int status = urb->status;
93 int retval;
94
95 switch (status) {
96 case 0:
97 /* success */
98 break;
99 case -EOVERFLOW:
100 printk(KERN_ERR "appletouch: OVERFLOW with data "
101 "length %d, actual length is %d\n",
102 ACD_URB_BUFFER_LEN, pdata->urb->actual_length);
103 case -ECONNRESET:
104 case -ENOENT:
105 case -ESHUTDOWN:
106 /* This urb is terminated, clean up */
107 dbg("%s - urb shuttingdown with status: %d",
108 __func__, status);
109 return;
110 default:
111 dbg("%s - nonzero urb status received: %d",
112 __func__, status);
113 goto exit;
114 }
115
116 spin_lock_irqsave(&pdata->lock, flags);
117
118 switch(pdata->urbdata[1]) {
119 case ACD_BTN_BRIGHT_UP:
120 case ACD_BTN_BRIGHT_DOWN:
121 pdata->button_pressed = 1;
122 queue_delayed_work(wq, &pdata->work, 0);
123 break;
124 case ACD_BTN_NONE:
125 default:
126 pdata->button_pressed = 0;
127 break;
128 }
129
130 spin_unlock_irqrestore(&pdata->lock, flags);
131
132exit:
133 retval = usb_submit_urb(pdata->urb, GFP_ATOMIC);
134 if (retval) {
135 dev_err(&pdata->udev->dev,
136 "%s - usb_submit_urb failed with result %d\n",
137 __func__, retval);
138 }
139}
140
141static int appledisplay_bl_update_status(struct backlight_device *bd)
142{
143 struct appledisplay *pdata = bl_get_data(bd);
144 int retval;
145
146 pdata->msgdata[0] = 0x10;
147 pdata->msgdata[1] = bd->props.brightness;
148
149 retval = usb_control_msg(
150 pdata->udev,
151 usb_sndctrlpipe(pdata->udev, 0),
152 USB_REQ_SET_REPORT,
153 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
154 ACD_USB_BRIGHTNESS,
155 0,
156 pdata->msgdata, 2,
157 ACD_USB_TIMEOUT);
158
159 return retval;
160}
161
162static int appledisplay_bl_get_brightness(struct backlight_device *bd)
163{
164 struct appledisplay *pdata = bl_get_data(bd);
165 int retval;
166
167 retval = usb_control_msg(
168 pdata->udev,
169 usb_rcvctrlpipe(pdata->udev, 0),
170 USB_REQ_GET_REPORT,
171 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
172 ACD_USB_BRIGHTNESS,
173 0,
174 pdata->msgdata, 2,
175 ACD_USB_TIMEOUT);
176
177 if (retval < 0)
178 return retval;
179 else
180 return pdata->msgdata[1];
181}
182
183static const struct backlight_ops appledisplay_bl_data = {
184 .get_brightness = appledisplay_bl_get_brightness,
185 .update_status = appledisplay_bl_update_status,
186};
187
188static void appledisplay_work(struct work_struct *work)
189{
190 struct appledisplay *pdata =
191 container_of(work, struct appledisplay, work.work);
192 int retval;
193
194 retval = appledisplay_bl_get_brightness(pdata->bd);
195 if (retval >= 0)
196 pdata->bd->props.brightness = retval;
197
198 /* Poll again in about 125ms if there's still a button pressed */
199 if (pdata->button_pressed)
200 schedule_delayed_work(&pdata->work, HZ / 8);
201}
202
203static int appledisplay_probe(struct usb_interface *iface,
204 const struct usb_device_id *id)
205{
206 struct backlight_properties props;
207 struct appledisplay *pdata;
208 struct usb_device *udev = interface_to_usbdev(iface);
209 struct usb_host_interface *iface_desc;
210 struct usb_endpoint_descriptor *endpoint;
211 int int_in_endpointAddr = 0;
212 int i, retval = -ENOMEM, brightness;
213 char bl_name[20];
214
215 /* set up the endpoint information */
216 /* use only the first interrupt-in endpoint */
217 iface_desc = iface->cur_altsetting;
218 for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
219 endpoint = &iface_desc->endpoint[i].desc;
220 if (!int_in_endpointAddr && usb_endpoint_is_int_in(endpoint)) {
221 /* we found an interrupt in endpoint */
222 int_in_endpointAddr = endpoint->bEndpointAddress;
223 break;
224 }
225 }
226 if (!int_in_endpointAddr) {
227 dev_err(&iface->dev, "Could not find int-in endpoint\n");
228 return -EIO;
229 }
230
231 /* allocate memory for our device state and initialize it */
232 pdata = kzalloc(sizeof(struct appledisplay), GFP_KERNEL);
233 if (!pdata) {
234 retval = -ENOMEM;
235 dev_err(&iface->dev, "Out of memory\n");
236 goto error;
237 }
238
239 pdata->udev = udev;
240
241 spin_lock_init(&pdata->lock);
242 INIT_DELAYED_WORK(&pdata->work, appledisplay_work);
243
244 /* Allocate buffer for control messages */
245 pdata->msgdata = kmalloc(ACD_MSG_BUFFER_LEN, GFP_KERNEL);
246 if (!pdata->msgdata) {
247 retval = -ENOMEM;
248 dev_err(&iface->dev,
249 "Allocating buffer for control messages failed\n");
250 goto error;
251 }
252
253 /* Allocate interrupt URB */
254 pdata->urb = usb_alloc_urb(0, GFP_KERNEL);
255 if (!pdata->urb) {
256 retval = -ENOMEM;
257 dev_err(&iface->dev, "Allocating URB failed\n");
258 goto error;
259 }
260
261 /* Allocate buffer for interrupt data */
262 pdata->urbdata = usb_alloc_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
263 GFP_KERNEL, &pdata->urb->transfer_dma);
264 if (!pdata->urbdata) {
265 retval = -ENOMEM;
266 dev_err(&iface->dev, "Allocating URB buffer failed\n");
267 goto error;
268 }
269
270 /* Configure interrupt URB */
271 usb_fill_int_urb(pdata->urb, udev,
272 usb_rcvintpipe(udev, int_in_endpointAddr),
273 pdata->urbdata, ACD_URB_BUFFER_LEN, appledisplay_complete,
274 pdata, 1);
275 if (usb_submit_urb(pdata->urb, GFP_KERNEL)) {
276 retval = -EIO;
277 dev_err(&iface->dev, "Submitting URB failed\n");
278 goto error;
279 }
280
281 /* Register backlight device */
282 snprintf(bl_name, sizeof(bl_name), "appledisplay%d",
283 atomic_inc_return(&count_displays) - 1);
284 memset(&props, 0, sizeof(struct backlight_properties));
285 props.type = BACKLIGHT_RAW;
286 props.max_brightness = 0xff;
287 pdata->bd = backlight_device_register(bl_name, NULL, pdata,
288 &appledisplay_bl_data, &props);
289 if (IS_ERR(pdata->bd)) {
290 dev_err(&iface->dev, "Backlight registration failed\n");
291 retval = PTR_ERR(pdata->bd);
292 goto error;
293 }
294
295 /* Try to get brightness */
296 brightness = appledisplay_bl_get_brightness(pdata->bd);
297
298 if (brightness < 0) {
299 retval = brightness;
300 dev_err(&iface->dev,
301 "Error while getting initial brightness: %d\n", retval);
302 goto error;
303 }
304
305 /* Set brightness in backlight device */
306 pdata->bd->props.brightness = brightness;
307
308 /* save our data pointer in the interface device */
309 usb_set_intfdata(iface, pdata);
310
311 printk(KERN_INFO "appledisplay: Apple Cinema Display connected\n");
312
313 return 0;
314
315error:
316 if (pdata) {
317 if (pdata->urb) {
318 usb_kill_urb(pdata->urb);
319 if (pdata->urbdata)
320 usb_free_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
321 pdata->urbdata, pdata->urb->transfer_dma);
322 usb_free_urb(pdata->urb);
323 }
324 if (pdata->bd && !IS_ERR(pdata->bd))
325 backlight_device_unregister(pdata->bd);
326 kfree(pdata->msgdata);
327 }
328 usb_set_intfdata(iface, NULL);
329 kfree(pdata);
330 return retval;
331}
332
333static void appledisplay_disconnect(struct usb_interface *iface)
334{
335 struct appledisplay *pdata = usb_get_intfdata(iface);
336
337 if (pdata) {
338 usb_kill_urb(pdata->urb);
339 cancel_delayed_work(&pdata->work);
340 backlight_device_unregister(pdata->bd);
341 usb_free_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
342 pdata->urbdata, pdata->urb->transfer_dma);
343 usb_free_urb(pdata->urb);
344 kfree(pdata->msgdata);
345 kfree(pdata);
346 }
347
348 printk(KERN_INFO "appledisplay: Apple Cinema Display disconnected\n");
349}
350
351static struct usb_driver appledisplay_driver = {
352 .name = "appledisplay",
353 .probe = appledisplay_probe,
354 .disconnect = appledisplay_disconnect,
355 .id_table = appledisplay_table,
356};
357
358static int __init appledisplay_init(void)
359{
360 wq = create_singlethread_workqueue("appledisplay");
361 if (!wq) {
362 printk(KERN_ERR "appledisplay: Could not create work queue\n");
363 return -ENOMEM;
364 }
365
366 return usb_register(&appledisplay_driver);
367}
368
369static void __exit appledisplay_exit(void)
370{
371 flush_workqueue(wq);
372 destroy_workqueue(wq);
373 usb_deregister(&appledisplay_driver);
374}
375
376MODULE_AUTHOR("Michael Hanselmann");
377MODULE_DESCRIPTION("Apple Cinema Display driver");
378MODULE_LICENSE("GPL");
379
380module_init(appledisplay_init);
381module_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);