diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/input/touchscreen/usbtouchscreen.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/usbtouchscreen.c b/drivers/input/touchscreen/usbtouchscreen.c index e32709e0dd65..721fdb3597ca 100644 --- a/drivers/input/touchscreen/usbtouchscreen.c +++ b/drivers/input/touchscreen/usbtouchscreen.c @@ -304,6 +304,45 @@ static int e2i_read_data(struct usbtouch_usb *dev, unsigned char *pkt) #define EGALAX_PKT_TYPE_REPT 0x80 #define EGALAX_PKT_TYPE_DIAG 0x0A +static int egalax_init(struct usbtouch_usb *usbtouch) +{ + int ret, i; + unsigned char *buf; + struct usb_device *udev = interface_to_usbdev(usbtouch->interface); + + /* + * An eGalax diagnostic packet kicks the device into using the right + * protocol. We send a "check active" packet. The response will be + * read later and ignored. + */ + + buf = kmalloc(3, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + buf[0] = EGALAX_PKT_TYPE_DIAG; + buf[1] = 1; /* length */ + buf[2] = 'A'; /* command - check active */ + + for (i = 0; i < 3; i++) { + ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), + 0, + USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, + 0, 0, buf, 3, + USB_CTRL_SET_TIMEOUT); + if (ret >= 0) { + ret = 0; + break; + } + if (ret != -EPIPE) + break; + } + + kfree(buf); + + return ret; +} + static int egalax_read_data(struct usbtouch_usb *dev, unsigned char *pkt) { if ((pkt[0] & EGALAX_PKT_TYPE_MASK) != EGALAX_PKT_TYPE_REPT) @@ -1056,6 +1095,7 @@ static struct usbtouch_device_info usbtouch_dev_info[] = { .process_pkt = usbtouch_process_multi, .get_pkt_len = egalax_get_pkt_len, .read_data = egalax_read_data, + .init = egalax_init, }, #endif |