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069e8a65 | 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 | ||
069e8a65 | 23 | #include <linux/kernel.h> |
24 | #include <linux/errno.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/usb.h> | |
28 | #include <linux/backlight.h> | |
29 | #include <linux/timer.h> | |
30 | #include <linux/workqueue.h> | |
31 | #include <asm/atomic.h> | |
32 | #include <asm/semaphore.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 */ | |
61 | static struct usb_device_id appledisplay_table [] = { | |
62 | { APPLEDISPLAY_DEVICE(0x9218) }, | |
63 | { APPLEDISPLAY_DEVICE(0x9219) }, | |
64 | { APPLEDISPLAY_DEVICE(0x921d) }, | |
65 | ||
66 | /* Terminating entry */ | |
67 | { } | |
68 | }; | |
69 | MODULE_DEVICE_TABLE(usb, appledisplay_table); | |
70 | ||
71 | /* Structure to hold all of our device specific stuff */ | |
72 | struct appledisplay { | |
73 | struct usb_device *udev; /* usb device */ | |
74 | struct urb *urb; /* usb request block */ | |
75 | struct backlight_device *bd; /* backlight device */ | |
76 | char *urbdata; /* interrupt URB data buffer */ | |
77 | char *msgdata; /* control message data buffer */ | |
78 | ||
79 | struct work_struct work; | |
80 | int button_pressed; | |
81 | spinlock_t lock; | |
82 | }; | |
83 | ||
84 | static atomic_t count_displays = ATOMIC_INIT(0); | |
85 | static struct workqueue_struct *wq; | |
86 | ||
7d12e780 | 87 | static void appledisplay_complete(struct urb *urb) |
069e8a65 | 88 | { |
89 | struct appledisplay *pdata = urb->context; | |
90 | unsigned long flags; | |
91 | int retval; | |
92 | ||
93 | switch (urb->status) { | |
94 | case 0: | |
95 | /* success */ | |
96 | break; | |
97 | case -EOVERFLOW: | |
98 | printk(KERN_ERR "appletouch: OVERFLOW with data " | |
99 | "length %d, actual length is %d\n", | |
100 | ACD_URB_BUFFER_LEN, pdata->urb->actual_length); | |
101 | case -ECONNRESET: | |
102 | case -ENOENT: | |
103 | case -ESHUTDOWN: | |
104 | /* This urb is terminated, clean up */ | |
105 | dbg("%s - urb shutting down with status: %d", | |
106 | __FUNCTION__, urb->status); | |
107 | return; | |
108 | default: | |
109 | dbg("%s - nonzero urb status received: %d", | |
110 | __FUNCTION__, urb->status); | |
111 | goto exit; | |
112 | } | |
113 | ||
114 | spin_lock_irqsave(&pdata->lock, flags); | |
115 | ||
116 | switch(pdata->urbdata[1]) { | |
117 | case ACD_BTN_BRIGHT_UP: | |
118 | case ACD_BTN_BRIGHT_DOWN: | |
119 | pdata->button_pressed = 1; | |
120 | queue_work(wq, &pdata->work); | |
121 | break; | |
122 | case ACD_BTN_NONE: | |
123 | default: | |
124 | pdata->button_pressed = 0; | |
125 | break; | |
126 | } | |
127 | ||
128 | spin_unlock_irqrestore(&pdata->lock, flags); | |
129 | ||
130 | exit: | |
131 | retval = usb_submit_urb(pdata->urb, GFP_ATOMIC); | |
132 | if (retval) { | |
133 | err("%s - usb_submit_urb failed with result %d", | |
134 | __FUNCTION__, retval); | |
135 | } | |
136 | } | |
137 | ||
138 | static int appledisplay_bl_update_status(struct backlight_device *bd) | |
139 | { | |
140 | struct appledisplay *pdata = class_get_devdata(&bd->class_dev); | |
141 | int retval; | |
142 | ||
143 | pdata->msgdata[0] = 0x10; | |
144 | pdata->msgdata[1] = bd->props->brightness; | |
145 | ||
146 | retval = usb_control_msg( | |
147 | pdata->udev, | |
148 | usb_sndctrlpipe(pdata->udev, 0), | |
149 | USB_REQ_SET_REPORT, | |
150 | USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
151 | ACD_USB_BRIGHTNESS, | |
152 | 0, | |
153 | pdata->msgdata, 2, | |
154 | ACD_USB_TIMEOUT); | |
155 | ||
156 | return retval; | |
157 | } | |
158 | ||
159 | static int appledisplay_bl_get_brightness(struct backlight_device *bd) | |
160 | { | |
161 | struct appledisplay *pdata = class_get_devdata(&bd->class_dev); | |
162 | int retval; | |
163 | ||
164 | retval = usb_control_msg( | |
165 | pdata->udev, | |
166 | usb_rcvctrlpipe(pdata->udev, 0), | |
167 | USB_REQ_GET_REPORT, | |
168 | USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
169 | ACD_USB_BRIGHTNESS, | |
170 | 0, | |
171 | pdata->msgdata, 2, | |
172 | ACD_USB_TIMEOUT); | |
173 | ||
174 | if (retval < 0) | |
175 | return retval; | |
176 | else | |
177 | return pdata->msgdata[1]; | |
178 | } | |
179 | ||
180 | static struct backlight_properties appledisplay_bl_data = { | |
181 | .owner = THIS_MODULE, | |
182 | .get_brightness = appledisplay_bl_get_brightness, | |
183 | .update_status = appledisplay_bl_update_status, | |
184 | .max_brightness = 0xFF | |
185 | }; | |
186 | ||
187 | static void appledisplay_work(void *private) | |
188 | { | |
189 | struct appledisplay *pdata = private; | |
190 | int retval; | |
191 | ||
192 | up(&pdata->bd->sem); | |
193 | retval = appledisplay_bl_get_brightness(pdata->bd); | |
194 | if (retval >= 0) | |
195 | pdata->bd->props->brightness = retval; | |
196 | down(&pdata->bd->sem); | |
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 | ||
203 | static int appledisplay_probe(struct usb_interface *iface, | |
204 | const struct usb_device_id *id) | |
205 | { | |
206 | struct appledisplay *pdata; | |
207 | struct usb_device *udev = interface_to_usbdev(iface); | |
208 | struct usb_host_interface *iface_desc; | |
209 | struct usb_endpoint_descriptor *endpoint; | |
210 | int int_in_endpointAddr = 0; | |
211 | int i, retval = -ENOMEM, brightness; | |
212 | char bl_name[20]; | |
213 | ||
214 | /* set up the endpoint information */ | |
215 | /* use only the first interrupt-in endpoint */ | |
216 | iface_desc = iface->cur_altsetting; | |
217 | for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) { | |
218 | endpoint = &iface_desc->endpoint[i].desc; | |
219 | if (!int_in_endpointAddr && | |
220 | (endpoint->bEndpointAddress & USB_DIR_IN) && | |
221 | ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == | |
222 | USB_ENDPOINT_XFER_INT)) { | |
223 | /* we found an interrupt in endpoint */ | |
224 | int_in_endpointAddr = endpoint->bEndpointAddress; | |
225 | break; | |
226 | } | |
227 | } | |
228 | if (!int_in_endpointAddr) { | |
229 | err("Could not find int-in endpoint"); | |
230 | return -EIO; | |
231 | } | |
232 | ||
233 | /* allocate memory for our device state and initialize it */ | |
234 | pdata = kzalloc(sizeof(struct appledisplay), GFP_KERNEL); | |
235 | if (!pdata) { | |
236 | retval = -ENOMEM; | |
237 | err("Out of memory"); | |
238 | goto error; | |
239 | } | |
240 | ||
241 | pdata->udev = udev; | |
242 | ||
243 | spin_lock_init(&pdata->lock); | |
244 | INIT_WORK(&pdata->work, appledisplay_work, pdata); | |
245 | ||
246 | /* Allocate buffer for control messages */ | |
247 | pdata->msgdata = kmalloc(ACD_MSG_BUFFER_LEN, GFP_KERNEL); | |
248 | if (!pdata->msgdata) { | |
249 | retval = -ENOMEM; | |
250 | err("appledisplay: Allocating buffer for control messages " | |
251 | "failed"); | |
252 | goto error; | |
253 | } | |
254 | ||
255 | /* Allocate interrupt URB */ | |
256 | pdata->urb = usb_alloc_urb(0, GFP_KERNEL); | |
257 | if (!pdata->urb) { | |
258 | retval = -ENOMEM; | |
259 | err("appledisplay: Allocating URB failed"); | |
260 | goto error; | |
261 | } | |
262 | ||
263 | /* Allocate buffer for interrupt data */ | |
264 | pdata->urbdata = usb_buffer_alloc(pdata->udev, ACD_URB_BUFFER_LEN, | |
265 | GFP_KERNEL, &pdata->urb->transfer_dma); | |
266 | if (!pdata->urbdata) { | |
267 | retval = -ENOMEM; | |
268 | err("appledisplay: Allocating URB buffer failed"); | |
269 | goto error; | |
270 | } | |
271 | ||
272 | /* Configure interrupt URB */ | |
273 | usb_fill_int_urb(pdata->urb, udev, | |
274 | usb_rcvintpipe(udev, int_in_endpointAddr), | |
275 | pdata->urbdata, ACD_URB_BUFFER_LEN, appledisplay_complete, | |
276 | pdata, 1); | |
277 | if (usb_submit_urb(pdata->urb, GFP_KERNEL)) { | |
278 | retval = -EIO; | |
279 | err("appledisplay: Submitting URB failed"); | |
280 | goto error; | |
281 | } | |
282 | ||
283 | /* Register backlight device */ | |
284 | snprintf(bl_name, sizeof(bl_name), "appledisplay%d", | |
285 | atomic_inc_return(&count_displays) - 1); | |
286 | pdata->bd = backlight_device_register(bl_name, pdata, | |
287 | &appledisplay_bl_data); | |
288 | if (IS_ERR(pdata->bd)) { | |
289 | err("appledisplay: Backlight registration failed"); | |
290 | goto error; | |
291 | } | |
292 | ||
293 | /* Try to get brightness */ | |
294 | up(&pdata->bd->sem); | |
295 | brightness = appledisplay_bl_get_brightness(pdata->bd); | |
296 | down(&pdata->bd->sem); | |
297 | ||
298 | if (brightness < 0) { | |
299 | retval = brightness; | |
300 | err("appledisplay: Error while getting initial brightness: %d", retval); | |
301 | goto error; | |
302 | } | |
303 | ||
304 | /* Set brightness in backlight device */ | |
305 | up(&pdata->bd->sem); | |
306 | pdata->bd->props->brightness = brightness; | |
307 | down(&pdata->bd->sem); | |
308 | ||
309 | /* save our data pointer in the interface device */ | |
310 | usb_set_intfdata(iface, pdata); | |
311 | ||
312 | printk(KERN_INFO "appledisplay: Apple Cinema Display connected\n"); | |
313 | ||
314 | return 0; | |
315 | ||
316 | error: | |
317 | if (pdata) { | |
318 | if (pdata->urb) { | |
319 | usb_kill_urb(pdata->urb); | |
320 | if (pdata->urbdata) | |
321 | usb_buffer_free(pdata->udev, ACD_URB_BUFFER_LEN, | |
322 | pdata->urbdata, pdata->urb->transfer_dma); | |
323 | usb_free_urb(pdata->urb); | |
324 | } | |
325 | if (pdata->bd) | |
326 | backlight_device_unregister(pdata->bd); | |
327 | kfree(pdata->msgdata); | |
328 | } | |
329 | usb_set_intfdata(iface, NULL); | |
330 | kfree(pdata); | |
331 | return retval; | |
332 | } | |
333 | ||
334 | static void appledisplay_disconnect(struct usb_interface *iface) | |
335 | { | |
336 | struct appledisplay *pdata = usb_get_intfdata(iface); | |
337 | ||
338 | if (pdata) { | |
339 | usb_kill_urb(pdata->urb); | |
340 | cancel_delayed_work(&pdata->work); | |
341 | backlight_device_unregister(pdata->bd); | |
342 | usb_buffer_free(pdata->udev, ACD_URB_BUFFER_LEN, | |
343 | pdata->urbdata, pdata->urb->transfer_dma); | |
344 | usb_free_urb(pdata->urb); | |
345 | kfree(pdata->msgdata); | |
346 | kfree(pdata); | |
347 | } | |
348 | ||
349 | printk(KERN_INFO "appledisplay: Apple Cinema Display disconnected\n"); | |
350 | } | |
351 | ||
352 | static struct usb_driver appledisplay_driver = { | |
353 | .name = "appledisplay", | |
354 | .probe = appledisplay_probe, | |
355 | .disconnect = appledisplay_disconnect, | |
356 | .id_table = appledisplay_table, | |
357 | }; | |
358 | ||
359 | static int __init appledisplay_init(void) | |
360 | { | |
361 | wq = create_singlethread_workqueue("appledisplay"); | |
362 | if (!wq) { | |
363 | err("Could not create work queue\n"); | |
364 | return -ENOMEM; | |
365 | } | |
366 | ||
367 | return usb_register(&appledisplay_driver); | |
368 | } | |
369 | ||
370 | static void __exit appledisplay_exit(void) | |
371 | { | |
372 | flush_workqueue(wq); | |
373 | destroy_workqueue(wq); | |
374 | usb_deregister(&appledisplay_driver); | |
375 | } | |
376 | ||
377 | MODULE_AUTHOR("Michael Hanselmann"); | |
378 | MODULE_DESCRIPTION("Apple Cinema Display driver"); | |
379 | MODULE_LICENSE("GPL"); | |
380 | ||
381 | module_init(appledisplay_init); | |
382 | module_exit(appledisplay_exit); |