Commit | Line | Data |
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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> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
069e8a65 | 28 | #include <linux/usb.h> |
29 | #include <linux/backlight.h> | |
30 | #include <linux/timer.h> | |
31 | #include <linux/workqueue.h> | |
32 | #include <asm/atomic.h> | |
069e8a65 | 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 */ | |
33b9e162 | 61 | static const struct usb_device_id appledisplay_table[] = { |
069e8a65 | 62 | { APPLEDISPLAY_DEVICE(0x9218) }, |
63 | { APPLEDISPLAY_DEVICE(0x9219) }, | |
4b372072 | 64 | { APPLEDISPLAY_DEVICE(0x921c) }, |
069e8a65 | 65 | { APPLEDISPLAY_DEVICE(0x921d) }, |
66 | ||
67 | /* Terminating entry */ | |
68 | { } | |
69 | }; | |
70 | MODULE_DEVICE_TABLE(usb, appledisplay_table); | |
71 | ||
72 | /* Structure to hold all of our device specific stuff */ | |
73 | struct appledisplay { | |
74 | struct usb_device *udev; /* usb device */ | |
75 | struct urb *urb; /* usb request block */ | |
76 | struct backlight_device *bd; /* backlight device */ | |
37e9066b | 77 | u8 *urbdata; /* interrupt URB data buffer */ |
78 | u8 *msgdata; /* control message data buffer */ | |
069e8a65 | 79 | |
6d5aefb8 | 80 | struct delayed_work work; |
069e8a65 | 81 | int button_pressed; |
82 | spinlock_t lock; | |
83 | }; | |
84 | ||
85 | static atomic_t count_displays = ATOMIC_INIT(0); | |
86 | static struct workqueue_struct *wq; | |
87 | ||
7d12e780 | 88 | static void appledisplay_complete(struct urb *urb) |
069e8a65 | 89 | { |
90 | struct appledisplay *pdata = urb->context; | |
91 | unsigned long flags; | |
13f9782d | 92 | int status = urb->status; |
069e8a65 | 93 | int retval; |
94 | ||
13f9782d | 95 | switch (status) { |
069e8a65 | 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 */ | |
13f9782d | 107 | dbg("%s - urb shuttingdown with status: %d", |
441b62c1 | 108 | __func__, status); |
069e8a65 | 109 | return; |
110 | default: | |
111 | dbg("%s - nonzero urb status received: %d", | |
441b62c1 | 112 | __func__, status); |
069e8a65 | 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; | |
6d5aefb8 | 122 | queue_delayed_work(wq, &pdata->work, 0); |
069e8a65 | 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 | ||
132 | exit: | |
133 | retval = usb_submit_urb(pdata->urb, GFP_ATOMIC); | |
134 | if (retval) { | |
fd3f1917 GKH |
135 | dev_err(&pdata->udev->dev, |
136 | "%s - usb_submit_urb failed with result %d\n", | |
441b62c1 | 137 | __func__, retval); |
069e8a65 | 138 | } |
139 | } | |
140 | ||
141 | static int appledisplay_bl_update_status(struct backlight_device *bd) | |
142 | { | |
655bfd7a | 143 | struct appledisplay *pdata = bl_get_data(bd); |
069e8a65 | 144 | int retval; |
145 | ||
146 | pdata->msgdata[0] = 0x10; | |
599a52d1 | 147 | pdata->msgdata[1] = bd->props.brightness; |
069e8a65 | 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 | ||
162 | static int appledisplay_bl_get_brightness(struct backlight_device *bd) | |
163 | { | |
655bfd7a | 164 | struct appledisplay *pdata = bl_get_data(bd); |
069e8a65 | 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 | ||
cedf8a78 | 183 | static const struct backlight_ops appledisplay_bl_data = { |
069e8a65 | 184 | .get_brightness = appledisplay_bl_get_brightness, |
185 | .update_status = appledisplay_bl_update_status, | |
069e8a65 | 186 | }; |
187 | ||
6d5aefb8 | 188 | static void appledisplay_work(struct work_struct *work) |
069e8a65 | 189 | { |
6d5aefb8 DH |
190 | struct appledisplay *pdata = |
191 | container_of(work, struct appledisplay, work.work); | |
069e8a65 | 192 | int retval; |
193 | ||
069e8a65 | 194 | retval = appledisplay_bl_get_brightness(pdata->bd); |
195 | if (retval >= 0) | |
599a52d1 | 196 | pdata->bd->props.brightness = retval; |
069e8a65 | 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 | { | |
a19a6ee6 | 206 | struct backlight_properties props; |
069e8a65 | 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; | |
16f96376 | 220 | if (!int_in_endpointAddr && usb_endpoint_is_int_in(endpoint)) { |
069e8a65 | 221 | /* we found an interrupt in endpoint */ |
222 | int_in_endpointAddr = endpoint->bEndpointAddress; | |
223 | break; | |
224 | } | |
225 | } | |
226 | if (!int_in_endpointAddr) { | |
fd3f1917 | 227 | dev_err(&iface->dev, "Could not find int-in endpoint\n"); |
069e8a65 | 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; | |
fd3f1917 | 235 | dev_err(&iface->dev, "Out of memory\n"); |
069e8a65 | 236 | goto error; |
237 | } | |
238 | ||
239 | pdata->udev = udev; | |
240 | ||
241 | spin_lock_init(&pdata->lock); | |
6d5aefb8 | 242 | INIT_DELAYED_WORK(&pdata->work, appledisplay_work); |
069e8a65 | 243 | |
244 | /* Allocate buffer for control messages */ | |
245 | pdata->msgdata = kmalloc(ACD_MSG_BUFFER_LEN, GFP_KERNEL); | |
246 | if (!pdata->msgdata) { | |
247 | retval = -ENOMEM; | |
fd3f1917 GKH |
248 | dev_err(&iface->dev, |
249 | "Allocating buffer for control messages failed\n"); | |
069e8a65 | 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; | |
fd3f1917 | 257 | dev_err(&iface->dev, "Allocating URB failed\n"); |
069e8a65 | 258 | goto error; |
259 | } | |
260 | ||
261 | /* Allocate buffer for interrupt data */ | |
997ea58e | 262 | pdata->urbdata = usb_alloc_coherent(pdata->udev, ACD_URB_BUFFER_LEN, |
069e8a65 | 263 | GFP_KERNEL, &pdata->urb->transfer_dma); |
264 | if (!pdata->urbdata) { | |
265 | retval = -ENOMEM; | |
fd3f1917 | 266 | dev_err(&iface->dev, "Allocating URB buffer failed\n"); |
069e8a65 | 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; | |
fd3f1917 | 277 | dev_err(&iface->dev, "Submitting URB failed\n"); |
069e8a65 | 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); | |
a19a6ee6 | 284 | memset(&props, 0, sizeof(struct backlight_properties)); |
bb7ca747 | 285 | props.type = BACKLIGHT_RAW; |
a19a6ee6 | 286 | props.max_brightness = 0xff; |
81450b73 | 287 | pdata->bd = backlight_device_register(bl_name, NULL, pdata, |
a19a6ee6 | 288 | &appledisplay_bl_data, &props); |
069e8a65 | 289 | if (IS_ERR(pdata->bd)) { |
fd3f1917 | 290 | dev_err(&iface->dev, "Backlight registration failed\n"); |
cedf8a78 | 291 | retval = PTR_ERR(pdata->bd); |
069e8a65 | 292 | goto error; |
293 | } | |
294 | ||
295 | /* Try to get brightness */ | |
069e8a65 | 296 | brightness = appledisplay_bl_get_brightness(pdata->bd); |
069e8a65 | 297 | |
298 | if (brightness < 0) { | |
299 | retval = brightness; | |
fd3f1917 GKH |
300 | dev_err(&iface->dev, |
301 | "Error while getting initial brightness: %d\n", retval); | |
069e8a65 | 302 | goto error; |
303 | } | |
304 | ||
305 | /* Set brightness in backlight device */ | |
599a52d1 | 306 | pdata->bd->props.brightness = brightness; |
069e8a65 | 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 | ||
315 | error: | |
316 | if (pdata) { | |
317 | if (pdata->urb) { | |
318 | usb_kill_urb(pdata->urb); | |
319 | if (pdata->urbdata) | |
997ea58e | 320 | usb_free_coherent(pdata->udev, ACD_URB_BUFFER_LEN, |
069e8a65 | 321 | pdata->urbdata, pdata->urb->transfer_dma); |
322 | usb_free_urb(pdata->urb); | |
323 | } | |
bedf0883 | 324 | if (pdata->bd && !IS_ERR(pdata->bd)) |
069e8a65 | 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 | ||
333 | static 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); | |
997ea58e | 341 | usb_free_coherent(pdata->udev, ACD_URB_BUFFER_LEN, |
069e8a65 | 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 | ||
351 | static struct usb_driver appledisplay_driver = { | |
352 | .name = "appledisplay", | |
353 | .probe = appledisplay_probe, | |
354 | .disconnect = appledisplay_disconnect, | |
355 | .id_table = appledisplay_table, | |
356 | }; | |
357 | ||
358 | static int __init appledisplay_init(void) | |
359 | { | |
360 | wq = create_singlethread_workqueue("appledisplay"); | |
361 | if (!wq) { | |
fd3f1917 | 362 | printk(KERN_ERR "appledisplay: Could not create work queue\n"); |
069e8a65 | 363 | return -ENOMEM; |
364 | } | |
365 | ||
366 | return usb_register(&appledisplay_driver); | |
367 | } | |
368 | ||
369 | static void __exit appledisplay_exit(void) | |
370 | { | |
371 | flush_workqueue(wq); | |
372 | destroy_workqueue(wq); | |
373 | usb_deregister(&appledisplay_driver); | |
374 | } | |
375 | ||
376 | MODULE_AUTHOR("Michael Hanselmann"); | |
377 | MODULE_DESCRIPTION("Apple Cinema Display driver"); | |
378 | MODULE_LICENSE("GPL"); | |
379 | ||
380 | module_init(appledisplay_init); | |
381 | module_exit(appledisplay_exit); |