| /* |
| * drivers/input/tablet/wacom_sys.c |
| * |
| * USB Wacom tablet support - system specific code |
| */ |
| |
| /* |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| */ |
| |
| #include "wacom_wac.h" |
| #include "wacom.h" |
| |
| /* defines to get HID report descriptor */ |
| #define HID_DEVICET_HID (USB_TYPE_CLASS | 0x01) |
| #define HID_DEVICET_REPORT (USB_TYPE_CLASS | 0x02) |
| #define HID_USAGE_UNDEFINED 0x00 |
| #define HID_USAGE_PAGE 0x05 |
| #define HID_USAGE_PAGE_DIGITIZER 0x0d |
| #define HID_USAGE_PAGE_DESKTOP 0x01 |
| #define HID_USAGE 0x09 |
| #define HID_USAGE_X 0x30 |
| #define HID_USAGE_Y 0x31 |
| #define HID_USAGE_X_TILT 0x3d |
| #define HID_USAGE_Y_TILT 0x3e |
| #define HID_USAGE_FINGER 0x22 |
| #define HID_USAGE_STYLUS 0x20 |
| #define HID_COLLECTION 0xc0 |
| |
| enum { |
| WCM_UNDEFINED = 0, |
| WCM_DESKTOP, |
| WCM_DIGITIZER, |
| }; |
| |
| struct hid_descriptor { |
| struct usb_descriptor_header header; |
| __le16 bcdHID; |
| u8 bCountryCode; |
| u8 bNumDescriptors; |
| u8 bDescriptorType; |
| __le16 wDescriptorLength; |
| } __attribute__ ((packed)); |
| |
| /* defines to get/set USB message */ |
| #define USB_REQ_GET_REPORT 0x01 |
| #define USB_REQ_SET_REPORT 0x09 |
| #define WAC_HID_FEATURE_REPORT 0x03 |
| |
| static int usb_get_report(struct usb_interface *intf, unsigned char type, |
| unsigned char id, void *buf, int size) |
| { |
| return usb_control_msg(interface_to_usbdev(intf), |
| usb_rcvctrlpipe(interface_to_usbdev(intf), 0), |
| USB_REQ_GET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE, |
| (type << 8) + id, intf->altsetting[0].desc.bInterfaceNumber, |
| buf, size, 100); |
| } |
| |
| static int usb_set_report(struct usb_interface *intf, unsigned char type, |
| unsigned char id, void *buf, int size) |
| { |
| return usb_control_msg(interface_to_usbdev(intf), |
| usb_sndctrlpipe(interface_to_usbdev(intf), 0), |
| USB_REQ_SET_REPORT, USB_TYPE_CLASS | USB_RECIP_INTERFACE, |
| (type << 8) + id, intf->altsetting[0].desc.bInterfaceNumber, |
| buf, size, 1000); |
| } |
| |
| static void wacom_sys_irq(struct urb *urb) |
| { |
| struct wacom *wacom = urb->context; |
| int retval; |
| |
| switch (urb->status) { |
| case 0: |
| /* success */ |
| break; |
| case -ECONNRESET: |
| case -ENOENT: |
| case -ESHUTDOWN: |
| /* this urb is terminated, clean up */ |
| dbg("%s - urb shutting down with status: %d", __func__, urb->status); |
| return; |
| default: |
| dbg("%s - nonzero urb status received: %d", __func__, urb->status); |
| goto exit; |
| } |
| |
| wacom_wac_irq(&wacom->wacom_wac, urb->actual_length); |
| |
| exit: |
| usb_mark_last_busy(wacom->usbdev); |
| retval = usb_submit_urb(urb, GFP_ATOMIC); |
| if (retval) |
| err ("%s - usb_submit_urb failed with result %d", |
| __func__, retval); |
| } |
| |
| static int wacom_open(struct input_dev *dev) |
| { |
| struct wacom *wacom = input_get_drvdata(dev); |
| |
| mutex_lock(&wacom->lock); |
| |
| wacom->irq->dev = wacom->usbdev; |
| |
| if (usb_autopm_get_interface(wacom->intf) < 0) { |
| mutex_unlock(&wacom->lock); |
| return -EIO; |
| } |
| |
| if (usb_submit_urb(wacom->irq, GFP_KERNEL)) { |
| usb_autopm_put_interface(wacom->intf); |
| mutex_unlock(&wacom->lock); |
| return -EIO; |
| } |
| |
| wacom->open = true; |
| wacom->intf->needs_remote_wakeup = 1; |
| |
| mutex_unlock(&wacom->lock); |
| return 0; |
| } |
| |
| static void wacom_close(struct input_dev *dev) |
| { |
| struct wacom *wacom = input_get_drvdata(dev); |
| |
| mutex_lock(&wacom->lock); |
| usb_kill_urb(wacom->irq); |
| wacom->open = false; |
| wacom->intf->needs_remote_wakeup = 0; |
| mutex_unlock(&wacom->lock); |
| } |
| |
| static int wacom_parse_hid(struct usb_interface *intf, struct hid_descriptor *hid_desc, |
| struct wacom_features *features) |
| { |
| struct usb_device *dev = interface_to_usbdev(intf); |
| char limit = 0; |
| /* result has to be defined as int for some devices */ |
| int result = 0; |
| int i = 0, usage = WCM_UNDEFINED, finger = 0, pen = 0; |
| unsigned char *report; |
| |
| report = kzalloc(hid_desc->wDescriptorLength, GFP_KERNEL); |
| if (!report) |
| return -ENOMEM; |
| |
| /* retrive report descriptors */ |
| do { |
| result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), |
| USB_REQ_GET_DESCRIPTOR, |
| USB_RECIP_INTERFACE | USB_DIR_IN, |
| HID_DEVICET_REPORT << 8, |
| intf->altsetting[0].desc.bInterfaceNumber, /* interface */ |
| report, |
| hid_desc->wDescriptorLength, |
| 5000); /* 5 secs */ |
| } while (result < 0 && limit++ < 5); |
| |
| /* No need to parse the Descriptor. It isn't an error though */ |
| if (result < 0) |
| goto out; |
| |
| for (i = 0; i < hid_desc->wDescriptorLength; i++) { |
| |
| switch (report[i]) { |
| case HID_USAGE_PAGE: |
| switch (report[i + 1]) { |
| case HID_USAGE_PAGE_DIGITIZER: |
| usage = WCM_DIGITIZER; |
| i++; |
| break; |
| |
| case HID_USAGE_PAGE_DESKTOP: |
| usage = WCM_DESKTOP; |
| i++; |
| break; |
| } |
| break; |
| |
| case HID_USAGE: |
| switch (report[i + 1]) { |
| case HID_USAGE_X: |
| if (usage == WCM_DESKTOP) { |
| if (finger) { |
| features->device_type = BTN_TOOL_DOUBLETAP; |
| if (features->type == TABLETPC2FG) { |
| /* need to reset back */ |
| features->pktlen = WACOM_PKGLEN_TPC2FG; |
| features->device_type = BTN_TOOL_TRIPLETAP; |
| } |
| features->x_max = |
| get_unaligned_le16(&report[i + 3]); |
| features->x_phy = |
| get_unaligned_le16(&report[i + 6]); |
| features->unit = report[i + 9]; |
| features->unitExpo = report[i + 11]; |
| i += 12; |
| } else if (pen) { |
| /* penabled only accepts exact bytes of data */ |
| if (features->type == TABLETPC2FG) |
| features->pktlen = WACOM_PKGLEN_GRAPHIRE; |
| features->device_type = BTN_TOOL_PEN; |
| features->x_max = |
| get_unaligned_le16(&report[i + 3]); |
| i += 4; |
| } |
| } else if (usage == WCM_DIGITIZER) { |
| /* max pressure isn't reported |
| features->pressure_max = (unsigned short) |
| (report[i+4] << 8 | report[i + 3]); |
| */ |
| features->pressure_max = 255; |
| i += 4; |
| } |
| break; |
| |
| case HID_USAGE_Y: |
| if (usage == WCM_DESKTOP) { |
| if (finger) { |
| features->device_type = BTN_TOOL_DOUBLETAP; |
| if (features->type == TABLETPC2FG) { |
| /* need to reset back */ |
| features->pktlen = WACOM_PKGLEN_TPC2FG; |
| features->device_type = BTN_TOOL_TRIPLETAP; |
| features->y_max = |
| get_unaligned_le16(&report[i + 3]); |
| features->y_phy = |
| get_unaligned_le16(&report[i + 6]); |
| i += 7; |
| } else { |
| features->y_max = |
| features->x_max; |
| features->y_phy = |
| get_unaligned_le16(&report[i + 3]); |
| i += 4; |
| } |
| } else if (pen) { |
| /* penabled only accepts exact bytes of data */ |
| if (features->type == TABLETPC2FG) |
| features->pktlen = WACOM_PKGLEN_GRAPHIRE; |
| features->device_type = BTN_TOOL_PEN; |
| features->y_max = |
| get_unaligned_le16(&report[i + 3]); |
| i += 4; |
| } |
| } |
| break; |
| |
| case HID_USAGE_FINGER: |
| finger = 1; |
| i++; |
| break; |
| |
| case HID_USAGE_STYLUS: |
| pen = 1; |
| i++; |
| break; |
| |
| case HID_USAGE_UNDEFINED: |
| if (usage == WCM_DESKTOP && finger) /* capacity */ |
| features->pressure_max = |
| get_unaligned_le16(&report[i + 3]); |
| i += 4; |
| break; |
| } |
| break; |
| |
| case HID_COLLECTION: |
| /* reset UsagePage and Finger */ |
| finger = usage = 0; |
| break; |
| } |
| } |
| |
| out: |
| result = 0; |
| kfree(report); |
| return result; |
| } |
| |
| static int wacom_query_tablet_data(struct usb_interface *intf, struct wacom_features *features) |
| { |
| unsigned char *rep_data; |
| int limit = 0, report_id = 2; |
| int error = -ENOMEM; |
| |
| rep_data = kmalloc(2, GFP_KERNEL); |
| if (!rep_data) |
| return error; |
| |
| /* ask to report tablet data if it is 2FGT or not a Tablet PC */ |
| if (features->device_type == BTN_TOOL_TRIPLETAP) { |
| do { |
| rep_data[0] = 3; |
| rep_data[1] = 4; |
| report_id = 3; |
| error = usb_set_report(intf, WAC_HID_FEATURE_REPORT, |
| report_id, rep_data, 2); |
| if (error >= 0) |
| error = usb_get_report(intf, |
| WAC_HID_FEATURE_REPORT, report_id, |
| rep_data, 3); |
| } while ((error < 0 || rep_data[1] != 4) && limit++ < 5); |
| } else if (features->type != TABLETPC && features->type != TABLETPC2FG) { |
| do { |
| rep_data[0] = 2; |
| rep_data[1] = 2; |
| error = usb_set_report(intf, WAC_HID_FEATURE_REPORT, |
| report_id, rep_data, 2); |
| if (error >= 0) |
| error = usb_get_report(intf, |
| WAC_HID_FEATURE_REPORT, report_id, |
| rep_data, 2); |
| } while ((error < 0 || rep_data[1] != 2) && limit++ < 5); |
| } |
| |
| kfree(rep_data); |
| |
| return error < 0 ? error : 0; |
| } |
| |
| static int wacom_retrieve_hid_descriptor(struct usb_interface *intf, |
| struct wacom_features *features) |
| { |
| int error = 0; |
| struct usb_host_interface *interface = intf->cur_altsetting; |
| struct hid_descriptor *hid_desc; |
| |
| /* default device to penabled */ |
| features->device_type = BTN_TOOL_PEN; |
| |
| /* only Tablet PCs need to retrieve the info */ |
| if ((features->type != TABLETPC) && (features->type != TABLETPC2FG)) |
| goto out; |
| |
| if (usb_get_extra_descriptor(interface, HID_DEVICET_HID, &hid_desc)) { |
| if (usb_get_extra_descriptor(&interface->endpoint[0], |
| HID_DEVICET_REPORT, &hid_desc)) { |
| printk("wacom: can not retrieve extra class descriptor\n"); |
| error = 1; |
| goto out; |
| } |
| } |
| error = wacom_parse_hid(intf, hid_desc, features); |
| if (error) |
| goto out; |
| |
| /* touch device found but size is not defined. use default */ |
| if (features->device_type == BTN_TOOL_DOUBLETAP && !features->x_max) { |
| features->x_max = 1023; |
| features->y_max = 1023; |
| } |
| |
| out: |
| return error; |
| } |
| |
| struct wacom_usbdev_data { |
| struct list_head list; |
| struct kref kref; |
| struct usb_device *dev; |
| struct wacom_shared shared; |
| }; |
| |
| static LIST_HEAD(wacom_udev_list); |
| static DEFINE_MUTEX(wacom_udev_list_lock); |
| |
| static struct wacom_usbdev_data *wacom_get_usbdev_data(struct usb_device *dev) |
| { |
| struct wacom_usbdev_data *data; |
| |
| list_for_each_entry(data, &wacom_udev_list, list) { |
| if (data->dev == dev) { |
| kref_get(&data->kref); |
| return data; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| static int wacom_add_shared_data(struct wacom_wac *wacom, |
| struct usb_device *dev) |
| { |
| struct wacom_usbdev_data *data; |
| int retval = 0; |
| |
| mutex_lock(&wacom_udev_list_lock); |
| |
| data = wacom_get_usbdev_data(dev); |
| if (!data) { |
| data = kzalloc(sizeof(struct wacom_usbdev_data), GFP_KERNEL); |
| if (!data) { |
| retval = -ENOMEM; |
| goto out; |
| } |
| |
| kref_init(&data->kref); |
| data->dev = dev; |
| list_add_tail(&data->list, &wacom_udev_list); |
| } |
| |
| wacom->shared = &data->shared; |
| |
| out: |
| mutex_unlock(&wacom_udev_list_lock); |
| return retval; |
| } |
| |
| static void wacom_release_shared_data(struct kref *kref) |
| { |
| struct wacom_usbdev_data *data = |
| container_of(kref, struct wacom_usbdev_data, kref); |
| |
| mutex_lock(&wacom_udev_list_lock); |
| list_del(&data->list); |
| mutex_unlock(&wacom_udev_list_lock); |
| |
| kfree(data); |
| } |
| |
| static void wacom_remove_shared_data(struct wacom_wac *wacom) |
| { |
| struct wacom_usbdev_data *data; |
| |
| if (wacom->shared) { |
| data = container_of(wacom->shared, struct wacom_usbdev_data, shared); |
| kref_put(&data->kref, wacom_release_shared_data); |
| wacom->shared = NULL; |
| } |
| } |
| |
| static int wacom_probe(struct usb_interface *intf, const struct usb_device_id *id) |
| { |
| struct usb_device *dev = interface_to_usbdev(intf); |
| struct usb_endpoint_descriptor *endpoint; |
| struct wacom *wacom; |
| struct wacom_wac *wacom_wac; |
| struct wacom_features *features; |
| struct input_dev *input_dev; |
| int error; |
| |
| if (!id->driver_info) |
| return -EINVAL; |
| |
| wacom = kzalloc(sizeof(struct wacom), GFP_KERNEL); |
| input_dev = input_allocate_device(); |
| if (!wacom || !input_dev) { |
| error = -ENOMEM; |
| goto fail1; |
| } |
| |
| wacom_wac = &wacom->wacom_wac; |
| wacom_wac->features = *((struct wacom_features *)id->driver_info); |
| features = &wacom_wac->features; |
| if (features->pktlen > WACOM_PKGLEN_MAX) { |
| error = -EINVAL; |
| goto fail1; |
| } |
| |
| wacom_wac->data = usb_alloc_coherent(dev, WACOM_PKGLEN_MAX, |
| GFP_KERNEL, &wacom->data_dma); |
| if (!wacom_wac->data) { |
| error = -ENOMEM; |
| goto fail1; |
| } |
| |
| wacom->irq = usb_alloc_urb(0, GFP_KERNEL); |
| if (!wacom->irq) { |
| error = -ENOMEM; |
| goto fail2; |
| } |
| |
| wacom->usbdev = dev; |
| wacom->intf = intf; |
| mutex_init(&wacom->lock); |
| usb_make_path(dev, wacom->phys, sizeof(wacom->phys)); |
| strlcat(wacom->phys, "/input0", sizeof(wacom->phys)); |
| |
| wacom_wac->input = input_dev; |
| |
| endpoint = &intf->cur_altsetting->endpoint[0].desc; |
| |
| /* Retrieve the physical and logical size for OEM devices */ |
| error = wacom_retrieve_hid_descriptor(intf, features); |
| if (error) |
| goto fail2; |
| |
| strlcpy(wacom_wac->name, features->name, sizeof(wacom_wac->name)); |
| |
| if (features->type == TABLETPC || features->type == TABLETPC2FG) { |
| /* Append the device type to the name */ |
| strlcat(wacom_wac->name, |
| features->device_type == BTN_TOOL_PEN ? |
| " Pen" : " Finger", |
| sizeof(wacom_wac->name)); |
| |
| error = wacom_add_shared_data(wacom_wac, dev); |
| if (error) |
| goto fail3; |
| } |
| |
| input_dev->name = wacom_wac->name; |
| input_dev->name = wacom_wac->name; |
| input_dev->dev.parent = &intf->dev; |
| input_dev->open = wacom_open; |
| input_dev->close = wacom_close; |
| usb_to_input_id(dev, &input_dev->id); |
| input_set_drvdata(input_dev, wacom); |
| |
| wacom_setup_input_capabilities(input_dev, wacom_wac); |
| |
| usb_fill_int_urb(wacom->irq, dev, |
| usb_rcvintpipe(dev, endpoint->bEndpointAddress), |
| wacom_wac->data, features->pktlen, |
| wacom_sys_irq, wacom, endpoint->bInterval); |
| wacom->irq->transfer_dma = wacom->data_dma; |
| wacom->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
| |
| error = input_register_device(input_dev); |
| if (error) |
| goto fail4; |
| |
| /* Note that if query fails it is not a hard failure */ |
| wacom_query_tablet_data(intf, features); |
| |
| usb_set_intfdata(intf, wacom); |
| return 0; |
| |
| fail4: wacom_remove_shared_data(wacom_wac); |
| fail3: usb_free_urb(wacom->irq); |
| fail2: usb_free_coherent(dev, WACOM_PKGLEN_MAX, wacom_wac->data, wacom->data_dma); |
| fail1: input_free_device(input_dev); |
| kfree(wacom); |
| return error; |
| } |
| |
| static void wacom_disconnect(struct usb_interface *intf) |
| { |
| struct wacom *wacom = usb_get_intfdata(intf); |
| |
| usb_set_intfdata(intf, NULL); |
| |
| usb_kill_urb(wacom->irq); |
| input_unregister_device(wacom->wacom_wac.input); |
| usb_free_urb(wacom->irq); |
| usb_free_coherent(interface_to_usbdev(intf), WACOM_PKGLEN_MAX, |
| wacom->wacom_wac.data, wacom->data_dma); |
| wacom_remove_shared_data(&wacom->wacom_wac); |
| kfree(wacom); |
| } |
| |
| static int wacom_suspend(struct usb_interface *intf, pm_message_t message) |
| { |
| struct wacom *wacom = usb_get_intfdata(intf); |
| |
| mutex_lock(&wacom->lock); |
| usb_kill_urb(wacom->irq); |
| mutex_unlock(&wacom->lock); |
| |
| return 0; |
| } |
| |
| static int wacom_resume(struct usb_interface *intf) |
| { |
| struct wacom *wacom = usb_get_intfdata(intf); |
| struct wacom_features *features = &wacom->wacom_wac.features; |
| int rv; |
| |
| mutex_lock(&wacom->lock); |
| |
| /* switch to wacom mode first */ |
| wacom_query_tablet_data(intf, features); |
| |
| if (wacom->open) |
| rv = usb_submit_urb(wacom->irq, GFP_NOIO); |
| else |
| rv = 0; |
| |
| mutex_unlock(&wacom->lock); |
| |
| return rv; |
| } |
| |
| static int wacom_reset_resume(struct usb_interface *intf) |
| { |
| return wacom_resume(intf); |
| } |
| |
| static struct usb_driver wacom_driver = { |
| .name = "wacom", |
| .id_table = wacom_ids, |
| .probe = wacom_probe, |
| .disconnect = wacom_disconnect, |
| .suspend = wacom_suspend, |
| .resume = wacom_resume, |
| .reset_resume = wacom_reset_resume, |
| .supports_autosuspend = 1, |
| }; |
| |
| static int __init wacom_init(void) |
| { |
| int result; |
| |
| result = usb_register(&wacom_driver); |
| if (result == 0) |
| printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":" |
| DRIVER_DESC "\n"); |
| return result; |
| } |
| |
| static void __exit wacom_exit(void) |
| { |
| usb_deregister(&wacom_driver); |
| } |
| |
| module_init(wacom_init); |
| module_exit(wacom_exit); |