synaptics_usb.c 15 KB

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  1. /*
  2. * USB Synaptics device driver
  3. *
  4. * Copyright (c) 2002 Rob Miller (rob@inpharmatica . co . uk)
  5. * Copyright (c) 2003 Ron Lee (ron@debian.org)
  6. * cPad driver for kernel 2.4
  7. *
  8. * Copyright (c) 2004 Jan Steinhoff (cpad@jan-steinhoff . de)
  9. * Copyright (c) 2004 Ron Lee (ron@debian.org)
  10. * rewritten for kernel 2.6
  11. *
  12. * cPad display character device part is not included. It can be found at
  13. * http://jan-steinhoff.de/linux/synaptics-usb.html
  14. *
  15. * Bases on: usb_skeleton.c v2.2 by Greg Kroah-Hartman
  16. * drivers/hid/usbhid/usbmouse.c by Vojtech Pavlik
  17. * drivers/input/mouse/synaptics.c by Peter Osterlund
  18. *
  19. * This program is free software; you can redistribute it and/or modify it
  20. * under the terms of the GNU General Public License as published by the Free
  21. * Software Foundation; either version 2 of the License, or (at your option)
  22. * any later version.
  23. *
  24. * Trademarks are the property of their respective owners.
  25. */
  26. /*
  27. * There are three different types of Synaptics USB devices: Touchpads,
  28. * touchsticks (or trackpoints), and touchscreens. Touchpads are well supported
  29. * by this driver, touchstick support has not been tested much yet, and
  30. * touchscreens have not been tested at all.
  31. *
  32. * Up to three alternate settings are possible:
  33. * setting 0: one int endpoint for relative movement (used by usbhid.ko)
  34. * setting 1: one int endpoint for absolute finger position
  35. * setting 2 (cPad only): one int endpoint for absolute finger position and
  36. * two bulk endpoints for the display (in/out)
  37. * This driver uses setting 1.
  38. */
  39. #include <linux/kernel.h>
  40. #include <linux/slab.h>
  41. #include <linux/module.h>
  42. #include <linux/moduleparam.h>
  43. #include <linux/usb.h>
  44. #include <linux/input.h>
  45. #include <linux/usb/input.h>
  46. #define USB_VENDOR_ID_SYNAPTICS 0x06cb
  47. #define USB_DEVICE_ID_SYNAPTICS_TP 0x0001 /* Synaptics USB TouchPad */
  48. #define USB_DEVICE_ID_SYNAPTICS_INT_TP 0x0002 /* Integrated USB TouchPad */
  49. #define USB_DEVICE_ID_SYNAPTICS_CPAD 0x0003 /* Synaptics cPad */
  50. #define USB_DEVICE_ID_SYNAPTICS_TS 0x0006 /* Synaptics TouchScreen */
  51. #define USB_DEVICE_ID_SYNAPTICS_STICK 0x0007 /* Synaptics USB Styk */
  52. #define USB_DEVICE_ID_SYNAPTICS_WP 0x0008 /* Synaptics USB WheelPad */
  53. #define USB_DEVICE_ID_SYNAPTICS_COMP_TP 0x0009 /* Composite USB TouchPad */
  54. #define USB_DEVICE_ID_SYNAPTICS_WTP 0x0010 /* Wireless TouchPad */
  55. #define USB_DEVICE_ID_SYNAPTICS_DPAD 0x0013 /* DisplayPad */
  56. #define SYNUSB_TOUCHPAD (1 << 0)
  57. #define SYNUSB_STICK (1 << 1)
  58. #define SYNUSB_TOUCHSCREEN (1 << 2)
  59. #define SYNUSB_AUXDISPLAY (1 << 3) /* For cPad */
  60. #define SYNUSB_COMBO (1 << 4) /* Composite device (TP + stick) */
  61. #define SYNUSB_IO_ALWAYS (1 << 5)
  62. #define USB_DEVICE_SYNAPTICS(prod, kind) \
  63. USB_DEVICE(USB_VENDOR_ID_SYNAPTICS, \
  64. USB_DEVICE_ID_SYNAPTICS_##prod), \
  65. .driver_info = (kind),
  66. #define SYNUSB_RECV_SIZE 8
  67. #define XMIN_NOMINAL 1472
  68. #define XMAX_NOMINAL 5472
  69. #define YMIN_NOMINAL 1408
  70. #define YMAX_NOMINAL 4448
  71. struct synusb {
  72. struct usb_device *udev;
  73. struct usb_interface *intf;
  74. struct urb *urb;
  75. unsigned char *data;
  76. /* serialize access to open/suspend */
  77. struct mutex pm_mutex;
  78. bool is_open;
  79. /* input device related data structures */
  80. struct input_dev *input;
  81. char name[128];
  82. char phys[64];
  83. /* characteristics of the device */
  84. unsigned long flags;
  85. };
  86. static void synusb_report_buttons(struct synusb *synusb)
  87. {
  88. struct input_dev *input_dev = synusb->input;
  89. input_report_key(input_dev, BTN_LEFT, synusb->data[1] & 0x04);
  90. input_report_key(input_dev, BTN_RIGHT, synusb->data[1] & 0x01);
  91. input_report_key(input_dev, BTN_MIDDLE, synusb->data[1] & 0x02);
  92. }
  93. static void synusb_report_stick(struct synusb *synusb)
  94. {
  95. struct input_dev *input_dev = synusb->input;
  96. int x, y;
  97. unsigned int pressure;
  98. pressure = synusb->data[6];
  99. x = (s16)(be16_to_cpup((__be16 *)&synusb->data[2]) << 3) >> 7;
  100. y = (s16)(be16_to_cpup((__be16 *)&synusb->data[4]) << 3) >> 7;
  101. if (pressure > 0) {
  102. input_report_rel(input_dev, REL_X, x);
  103. input_report_rel(input_dev, REL_Y, -y);
  104. }
  105. input_report_abs(input_dev, ABS_PRESSURE, pressure);
  106. synusb_report_buttons(synusb);
  107. input_sync(input_dev);
  108. }
  109. static void synusb_report_touchpad(struct synusb *synusb)
  110. {
  111. struct input_dev *input_dev = synusb->input;
  112. unsigned int num_fingers, tool_width;
  113. unsigned int x, y;
  114. unsigned int pressure, w;
  115. pressure = synusb->data[6];
  116. x = be16_to_cpup((__be16 *)&synusb->data[2]);
  117. y = be16_to_cpup((__be16 *)&synusb->data[4]);
  118. w = synusb->data[0] & 0x0f;
  119. if (pressure > 0) {
  120. num_fingers = 1;
  121. tool_width = 5;
  122. switch (w) {
  123. case 0 ... 1:
  124. num_fingers = 2 + w;
  125. break;
  126. case 2: /* pen, pretend its a finger */
  127. break;
  128. case 4 ... 15:
  129. tool_width = w;
  130. break;
  131. }
  132. } else {
  133. num_fingers = 0;
  134. tool_width = 0;
  135. }
  136. /*
  137. * Post events
  138. * BTN_TOUCH has to be first as mousedev relies on it when doing
  139. * absolute -> relative conversion
  140. */
  141. if (pressure > 30)
  142. input_report_key(input_dev, BTN_TOUCH, 1);
  143. if (pressure < 25)
  144. input_report_key(input_dev, BTN_TOUCH, 0);
  145. if (num_fingers > 0) {
  146. input_report_abs(input_dev, ABS_X, x);
  147. input_report_abs(input_dev, ABS_Y,
  148. YMAX_NOMINAL + YMIN_NOMINAL - y);
  149. }
  150. input_report_abs(input_dev, ABS_PRESSURE, pressure);
  151. input_report_abs(input_dev, ABS_TOOL_WIDTH, tool_width);
  152. input_report_key(input_dev, BTN_TOOL_FINGER, num_fingers == 1);
  153. input_report_key(input_dev, BTN_TOOL_DOUBLETAP, num_fingers == 2);
  154. input_report_key(input_dev, BTN_TOOL_TRIPLETAP, num_fingers == 3);
  155. synusb_report_buttons(synusb);
  156. if (synusb->flags & SYNUSB_AUXDISPLAY)
  157. input_report_key(input_dev, BTN_MIDDLE, synusb->data[1] & 0x08);
  158. input_sync(input_dev);
  159. }
  160. static void synusb_irq(struct urb *urb)
  161. {
  162. struct synusb *synusb = urb->context;
  163. int error;
  164. /* Check our status in case we need to bail out early. */
  165. switch (urb->status) {
  166. case 0:
  167. usb_mark_last_busy(synusb->udev);
  168. break;
  169. /* Device went away so don't keep trying to read from it. */
  170. case -ECONNRESET:
  171. case -ENOENT:
  172. case -ESHUTDOWN:
  173. return;
  174. default:
  175. goto resubmit;
  176. break;
  177. }
  178. if (synusb->flags & SYNUSB_STICK)
  179. synusb_report_stick(synusb);
  180. else
  181. synusb_report_touchpad(synusb);
  182. resubmit:
  183. error = usb_submit_urb(urb, GFP_ATOMIC);
  184. if (error && error != -EPERM)
  185. dev_err(&synusb->intf->dev,
  186. "%s - usb_submit_urb failed with result: %d",
  187. __func__, error);
  188. }
  189. static struct usb_endpoint_descriptor *
  190. synusb_get_in_endpoint(struct usb_host_interface *iface)
  191. {
  192. struct usb_endpoint_descriptor *endpoint;
  193. int i;
  194. for (i = 0; i < iface->desc.bNumEndpoints; ++i) {
  195. endpoint = &iface->endpoint[i].desc;
  196. if (usb_endpoint_is_int_in(endpoint)) {
  197. /* we found our interrupt in endpoint */
  198. return endpoint;
  199. }
  200. }
  201. return NULL;
  202. }
  203. static int synusb_open(struct input_dev *dev)
  204. {
  205. struct synusb *synusb = input_get_drvdata(dev);
  206. int retval;
  207. retval = usb_autopm_get_interface(synusb->intf);
  208. if (retval) {
  209. dev_err(&synusb->intf->dev,
  210. "%s - usb_autopm_get_interface failed, error: %d\n",
  211. __func__, retval);
  212. return retval;
  213. }
  214. mutex_lock(&synusb->pm_mutex);
  215. retval = usb_submit_urb(synusb->urb, GFP_KERNEL);
  216. if (retval) {
  217. dev_err(&synusb->intf->dev,
  218. "%s - usb_submit_urb failed, error: %d\n",
  219. __func__, retval);
  220. retval = -EIO;
  221. goto out;
  222. }
  223. synusb->intf->needs_remote_wakeup = 1;
  224. synusb->is_open = true;
  225. out:
  226. mutex_unlock(&synusb->pm_mutex);
  227. usb_autopm_put_interface(synusb->intf);
  228. return retval;
  229. }
  230. static void synusb_close(struct input_dev *dev)
  231. {
  232. struct synusb *synusb = input_get_drvdata(dev);
  233. int autopm_error;
  234. autopm_error = usb_autopm_get_interface(synusb->intf);
  235. mutex_lock(&synusb->pm_mutex);
  236. usb_kill_urb(synusb->urb);
  237. synusb->intf->needs_remote_wakeup = 0;
  238. synusb->is_open = false;
  239. mutex_unlock(&synusb->pm_mutex);
  240. if (!autopm_error)
  241. usb_autopm_put_interface(synusb->intf);
  242. }
  243. static int synusb_probe(struct usb_interface *intf,
  244. const struct usb_device_id *id)
  245. {
  246. struct usb_device *udev = interface_to_usbdev(intf);
  247. struct usb_endpoint_descriptor *ep;
  248. struct synusb *synusb;
  249. struct input_dev *input_dev;
  250. unsigned int intf_num = intf->cur_altsetting->desc.bInterfaceNumber;
  251. unsigned int altsetting = min(intf->num_altsetting, 1U);
  252. int error;
  253. error = usb_set_interface(udev, intf_num, altsetting);
  254. if (error) {
  255. dev_err(&udev->dev,
  256. "Can not set alternate setting to %i, error: %i",
  257. altsetting, error);
  258. return error;
  259. }
  260. ep = synusb_get_in_endpoint(intf->cur_altsetting);
  261. if (!ep)
  262. return -ENODEV;
  263. synusb = kzalloc(sizeof(*synusb), GFP_KERNEL);
  264. input_dev = input_allocate_device();
  265. if (!synusb || !input_dev) {
  266. error = -ENOMEM;
  267. goto err_free_mem;
  268. }
  269. synusb->udev = udev;
  270. synusb->intf = intf;
  271. synusb->input = input_dev;
  272. mutex_init(&synusb->pm_mutex);
  273. synusb->flags = id->driver_info;
  274. if (synusb->flags & SYNUSB_COMBO) {
  275. /*
  276. * This is a combo device, we need to set proper
  277. * capability, depending on the interface.
  278. */
  279. synusb->flags |= intf_num == 1 ?
  280. SYNUSB_STICK : SYNUSB_TOUCHPAD;
  281. }
  282. synusb->urb = usb_alloc_urb(0, GFP_KERNEL);
  283. if (!synusb->urb) {
  284. error = -ENOMEM;
  285. goto err_free_mem;
  286. }
  287. synusb->data = usb_alloc_coherent(udev, SYNUSB_RECV_SIZE, GFP_KERNEL,
  288. &synusb->urb->transfer_dma);
  289. if (!synusb->data) {
  290. error = -ENOMEM;
  291. goto err_free_urb;
  292. }
  293. usb_fill_int_urb(synusb->urb, udev,
  294. usb_rcvintpipe(udev, ep->bEndpointAddress),
  295. synusb->data, SYNUSB_RECV_SIZE,
  296. synusb_irq, synusb,
  297. ep->bInterval);
  298. synusb->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
  299. if (udev->manufacturer)
  300. strlcpy(synusb->name, udev->manufacturer,
  301. sizeof(synusb->name));
  302. if (udev->product) {
  303. if (udev->manufacturer)
  304. strlcat(synusb->name, " ", sizeof(synusb->name));
  305. strlcat(synusb->name, udev->product, sizeof(synusb->name));
  306. }
  307. if (!strlen(synusb->name))
  308. snprintf(synusb->name, sizeof(synusb->name),
  309. "USB Synaptics Device %04x:%04x",
  310. le16_to_cpu(udev->descriptor.idVendor),
  311. le16_to_cpu(udev->descriptor.idProduct));
  312. if (synusb->flags & SYNUSB_STICK)
  313. strlcat(synusb->name, " (Stick)", sizeof(synusb->name));
  314. usb_make_path(udev, synusb->phys, sizeof(synusb->phys));
  315. strlcat(synusb->phys, "/input0", sizeof(synusb->phys));
  316. input_dev->name = synusb->name;
  317. input_dev->phys = synusb->phys;
  318. usb_to_input_id(udev, &input_dev->id);
  319. input_dev->dev.parent = &synusb->intf->dev;
  320. if (!(synusb->flags & SYNUSB_IO_ALWAYS)) {
  321. input_dev->open = synusb_open;
  322. input_dev->close = synusb_close;
  323. }
  324. input_set_drvdata(input_dev, synusb);
  325. __set_bit(EV_ABS, input_dev->evbit);
  326. __set_bit(EV_KEY, input_dev->evbit);
  327. if (synusb->flags & SYNUSB_STICK) {
  328. __set_bit(EV_REL, input_dev->evbit);
  329. __set_bit(REL_X, input_dev->relbit);
  330. __set_bit(REL_Y, input_dev->relbit);
  331. __set_bit(INPUT_PROP_POINTING_STICK, input_dev->propbit);
  332. input_set_abs_params(input_dev, ABS_PRESSURE, 0, 127, 0, 0);
  333. } else {
  334. input_set_abs_params(input_dev, ABS_X,
  335. XMIN_NOMINAL, XMAX_NOMINAL, 0, 0);
  336. input_set_abs_params(input_dev, ABS_Y,
  337. YMIN_NOMINAL, YMAX_NOMINAL, 0, 0);
  338. input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0);
  339. input_set_abs_params(input_dev, ABS_TOOL_WIDTH, 0, 15, 0, 0);
  340. __set_bit(BTN_TOUCH, input_dev->keybit);
  341. __set_bit(BTN_TOOL_FINGER, input_dev->keybit);
  342. __set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit);
  343. __set_bit(BTN_TOOL_TRIPLETAP, input_dev->keybit);
  344. }
  345. if (synusb->flags & SYNUSB_TOUCHSCREEN)
  346. __set_bit(INPUT_PROP_DIRECT, input_dev->propbit);
  347. else
  348. __set_bit(INPUT_PROP_POINTER, input_dev->propbit);
  349. __set_bit(BTN_LEFT, input_dev->keybit);
  350. __set_bit(BTN_RIGHT, input_dev->keybit);
  351. __set_bit(BTN_MIDDLE, input_dev->keybit);
  352. usb_set_intfdata(intf, synusb);
  353. if (synusb->flags & SYNUSB_IO_ALWAYS) {
  354. error = synusb_open(input_dev);
  355. if (error)
  356. goto err_free_dma;
  357. }
  358. error = input_register_device(input_dev);
  359. if (error) {
  360. dev_err(&udev->dev,
  361. "Failed to register input device, error %d\n",
  362. error);
  363. goto err_stop_io;
  364. }
  365. return 0;
  366. err_stop_io:
  367. if (synusb->flags & SYNUSB_IO_ALWAYS)
  368. synusb_close(synusb->input);
  369. err_free_dma:
  370. usb_free_coherent(udev, SYNUSB_RECV_SIZE, synusb->data,
  371. synusb->urb->transfer_dma);
  372. err_free_urb:
  373. usb_free_urb(synusb->urb);
  374. err_free_mem:
  375. input_free_device(input_dev);
  376. kfree(synusb);
  377. usb_set_intfdata(intf, NULL);
  378. return error;
  379. }
  380. static void synusb_disconnect(struct usb_interface *intf)
  381. {
  382. struct synusb *synusb = usb_get_intfdata(intf);
  383. struct usb_device *udev = interface_to_usbdev(intf);
  384. if (synusb->flags & SYNUSB_IO_ALWAYS)
  385. synusb_close(synusb->input);
  386. input_unregister_device(synusb->input);
  387. usb_free_coherent(udev, SYNUSB_RECV_SIZE, synusb->data,
  388. synusb->urb->transfer_dma);
  389. usb_free_urb(synusb->urb);
  390. kfree(synusb);
  391. usb_set_intfdata(intf, NULL);
  392. }
  393. static int synusb_suspend(struct usb_interface *intf, pm_message_t message)
  394. {
  395. struct synusb *synusb = usb_get_intfdata(intf);
  396. mutex_lock(&synusb->pm_mutex);
  397. usb_kill_urb(synusb->urb);
  398. mutex_unlock(&synusb->pm_mutex);
  399. return 0;
  400. }
  401. static int synusb_resume(struct usb_interface *intf)
  402. {
  403. struct synusb *synusb = usb_get_intfdata(intf);
  404. int retval = 0;
  405. mutex_lock(&synusb->pm_mutex);
  406. if ((synusb->is_open || (synusb->flags & SYNUSB_IO_ALWAYS)) &&
  407. usb_submit_urb(synusb->urb, GFP_NOIO) < 0) {
  408. retval = -EIO;
  409. }
  410. mutex_unlock(&synusb->pm_mutex);
  411. return retval;
  412. }
  413. static int synusb_pre_reset(struct usb_interface *intf)
  414. {
  415. struct synusb *synusb = usb_get_intfdata(intf);
  416. mutex_lock(&synusb->pm_mutex);
  417. usb_kill_urb(synusb->urb);
  418. return 0;
  419. }
  420. static int synusb_post_reset(struct usb_interface *intf)
  421. {
  422. struct synusb *synusb = usb_get_intfdata(intf);
  423. int retval = 0;
  424. if ((synusb->is_open || (synusb->flags & SYNUSB_IO_ALWAYS)) &&
  425. usb_submit_urb(synusb->urb, GFP_NOIO) < 0) {
  426. retval = -EIO;
  427. }
  428. mutex_unlock(&synusb->pm_mutex);
  429. return retval;
  430. }
  431. static int synusb_reset_resume(struct usb_interface *intf)
  432. {
  433. return synusb_resume(intf);
  434. }
  435. static const struct usb_device_id synusb_idtable[] = {
  436. { USB_DEVICE_SYNAPTICS(TP, SYNUSB_TOUCHPAD) },
  437. { USB_DEVICE_SYNAPTICS(INT_TP, SYNUSB_TOUCHPAD) },
  438. { USB_DEVICE_SYNAPTICS(CPAD,
  439. SYNUSB_TOUCHPAD | SYNUSB_AUXDISPLAY | SYNUSB_IO_ALWAYS) },
  440. { USB_DEVICE_SYNAPTICS(TS, SYNUSB_TOUCHSCREEN) },
  441. { USB_DEVICE_SYNAPTICS(STICK, SYNUSB_STICK) },
  442. { USB_DEVICE_SYNAPTICS(WP, SYNUSB_TOUCHPAD) },
  443. { USB_DEVICE_SYNAPTICS(COMP_TP, SYNUSB_COMBO) },
  444. { USB_DEVICE_SYNAPTICS(WTP, SYNUSB_TOUCHPAD) },
  445. { USB_DEVICE_SYNAPTICS(DPAD, SYNUSB_TOUCHPAD) },
  446. { }
  447. };
  448. MODULE_DEVICE_TABLE(usb, synusb_idtable);
  449. static struct usb_driver synusb_driver = {
  450. .name = "synaptics_usb",
  451. .probe = synusb_probe,
  452. .disconnect = synusb_disconnect,
  453. .id_table = synusb_idtable,
  454. .suspend = synusb_suspend,
  455. .resume = synusb_resume,
  456. .pre_reset = synusb_pre_reset,
  457. .post_reset = synusb_post_reset,
  458. .reset_resume = synusb_reset_resume,
  459. .supports_autosuspend = 1,
  460. };
  461. module_usb_driver(synusb_driver);
  462. MODULE_AUTHOR("Rob Miller <rob@inpharmatica.co.uk>, "
  463. "Ron Lee <ron@debian.org>, "
  464. "Jan Steinhoff <cpad@jan-steinhoff.de>");
  465. MODULE_DESCRIPTION("Synaptics USB device driver");
  466. MODULE_LICENSE("GPL");