a001100d8e
This patch corrects the URB initialisation for transfers like this is done in other drivers too. Without this patch no data was transmitted on a PXA270 OHCI platform. May apply to others too. Signed-off-by: Juergen Schindele <schindele@nentec.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
399 lines
10 KiB
C
399 lines
10 KiB
C
/******************************************************************************
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* touchkitusb.c -- Driver for eGalax TouchKit USB Touchscreens
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*
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* Copyright (C) 2004-2005 by Daniel Ritz <daniel.ritz@gmx.ch>
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* Copyright (C) by Todd E. Johnson (mtouchusb.c)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Based upon mtouchusb.c
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*
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*****************************************************************************/
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//#define DEBUG
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/usb.h>
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#include <linux/usb_input.h>
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#define TOUCHKIT_MIN_XC 0x0
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#define TOUCHKIT_MAX_XC 0x07ff
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#define TOUCHKIT_XC_FUZZ 0x0
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#define TOUCHKIT_XC_FLAT 0x0
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#define TOUCHKIT_MIN_YC 0x0
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#define TOUCHKIT_MAX_YC 0x07ff
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#define TOUCHKIT_YC_FUZZ 0x0
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#define TOUCHKIT_YC_FLAT 0x0
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#define TOUCHKIT_REPORT_DATA_SIZE 16
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#define TOUCHKIT_DOWN 0x01
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#define TOUCHKIT_PKT_TYPE_MASK 0xFE
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#define TOUCHKIT_PKT_TYPE_REPT 0x80
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#define TOUCHKIT_PKT_TYPE_DIAG 0x0A
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#define DRIVER_VERSION "v0.1"
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#define DRIVER_AUTHOR "Daniel Ritz <daniel.ritz@gmx.ch>"
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#define DRIVER_DESC "eGalax TouchKit USB HID Touchscreen Driver"
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static int swap_xy;
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module_param(swap_xy, bool, 0644);
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MODULE_PARM_DESC(swap_xy, "If set X and Y axes are swapped.");
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struct touchkit_usb {
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unsigned char *data;
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dma_addr_t data_dma;
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char buffer[TOUCHKIT_REPORT_DATA_SIZE];
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int buf_len;
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struct urb *irq;
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struct usb_device *udev;
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struct input_dev *input;
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char name[128];
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char phys[64];
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};
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static struct usb_device_id touchkit_devices[] = {
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{USB_DEVICE(0x3823, 0x0001)},
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{USB_DEVICE(0x0123, 0x0001)},
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{USB_DEVICE(0x0eef, 0x0001)},
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{USB_DEVICE(0x0eef, 0x0002)},
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{}
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};
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/* helpers to read the data */
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static inline int touchkit_get_touched(char *data)
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{
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return (data[0] & TOUCHKIT_DOWN) ? 1 : 0;
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}
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static inline int touchkit_get_x(char *data)
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{
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return ((data[3] & 0x0F) << 7) | (data[4] & 0x7F);
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}
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static inline int touchkit_get_y(char *data)
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{
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return ((data[1] & 0x0F) << 7) | (data[2] & 0x7F);
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}
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/* processes one input packet. */
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static void touchkit_process_pkt(struct touchkit_usb *touchkit,
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struct pt_regs *regs, char *pkt)
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{
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int x, y;
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/* only process report packets */
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if ((pkt[0] & TOUCHKIT_PKT_TYPE_MASK) != TOUCHKIT_PKT_TYPE_REPT)
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return;
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if (swap_xy) {
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y = touchkit_get_x(pkt);
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x = touchkit_get_y(pkt);
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} else {
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x = touchkit_get_x(pkt);
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y = touchkit_get_y(pkt);
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}
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input_regs(touchkit->input, regs);
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input_report_key(touchkit->input, BTN_TOUCH, touchkit_get_touched(pkt));
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input_report_abs(touchkit->input, ABS_X, x);
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input_report_abs(touchkit->input, ABS_Y, y);
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input_sync(touchkit->input);
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}
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static int touchkit_get_pkt_len(char *buf)
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{
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switch (buf[0] & TOUCHKIT_PKT_TYPE_MASK) {
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case TOUCHKIT_PKT_TYPE_REPT:
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return 5;
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case TOUCHKIT_PKT_TYPE_DIAG:
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return buf[1] + 2;
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}
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return 0;
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}
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static void touchkit_process(struct touchkit_usb *touchkit, int len,
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struct pt_regs *regs)
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{
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char *buffer;
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int pkt_len, buf_len, pos;
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/* if the buffer contains data, append */
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if (unlikely(touchkit->buf_len)) {
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int tmp;
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/* if only 1 byte in buffer, add another one to get length */
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if (touchkit->buf_len == 1)
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touchkit->buffer[1] = touchkit->data[0];
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pkt_len = touchkit_get_pkt_len(touchkit->buffer);
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/* unknown packet: drop everything */
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if (!pkt_len)
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return;
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/* append, process */
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tmp = pkt_len - touchkit->buf_len;
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memcpy(touchkit->buffer + touchkit->buf_len, touchkit->data, tmp);
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touchkit_process_pkt(touchkit, regs, touchkit->buffer);
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buffer = touchkit->data + tmp;
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buf_len = len - tmp;
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} else {
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buffer = touchkit->data;
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buf_len = len;
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}
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/* only one byte left in buffer */
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if (unlikely(buf_len == 1)) {
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touchkit->buffer[0] = buffer[0];
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touchkit->buf_len = 1;
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return;
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}
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/* loop over the buffer */
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pos = 0;
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while (pos < buf_len) {
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/* get packet len */
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pkt_len = touchkit_get_pkt_len(buffer + pos);
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/* unknown packet: drop everything */
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if (unlikely(!pkt_len))
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return;
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/* full packet: process */
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if (likely(pkt_len <= buf_len)) {
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touchkit_process_pkt(touchkit, regs, buffer + pos);
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} else {
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/* incomplete packet: save in buffer */
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memcpy(touchkit->buffer, buffer + pos, buf_len - pos);
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touchkit->buf_len = buf_len - pos;
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}
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pos += pkt_len;
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}
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}
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static void touchkit_irq(struct urb *urb, struct pt_regs *regs)
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{
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struct touchkit_usb *touchkit = urb->context;
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int retval;
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switch (urb->status) {
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case 0:
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/* success */
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break;
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case -ETIMEDOUT:
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/* this urb is timing out */
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dbg("%s - urb timed out - was the device unplugged?",
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__FUNCTION__);
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return;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* this urb is terminated, clean up */
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dbg("%s - urb shutting down with status: %d",
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__FUNCTION__, urb->status);
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return;
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default:
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dbg("%s - nonzero urb status received: %d",
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__FUNCTION__, urb->status);
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goto exit;
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}
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touchkit_process(touchkit, urb->actual_length, regs);
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exit:
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retval = usb_submit_urb(urb, GFP_ATOMIC);
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if (retval)
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err("%s - usb_submit_urb failed with result: %d",
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__FUNCTION__, retval);
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}
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static int touchkit_open(struct input_dev *input)
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{
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struct touchkit_usb *touchkit = input->private;
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touchkit->irq->dev = touchkit->udev;
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if (usb_submit_urb(touchkit->irq, GFP_ATOMIC))
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return -EIO;
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return 0;
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}
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static void touchkit_close(struct input_dev *input)
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{
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struct touchkit_usb *touchkit = input->private;
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usb_kill_urb(touchkit->irq);
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}
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static int touchkit_alloc_buffers(struct usb_device *udev,
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struct touchkit_usb *touchkit)
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{
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touchkit->data = usb_buffer_alloc(udev, TOUCHKIT_REPORT_DATA_SIZE,
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SLAB_ATOMIC, &touchkit->data_dma);
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if (!touchkit->data)
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return -1;
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return 0;
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}
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static void touchkit_free_buffers(struct usb_device *udev,
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struct touchkit_usb *touchkit)
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{
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if (touchkit->data)
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usb_buffer_free(udev, TOUCHKIT_REPORT_DATA_SIZE,
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touchkit->data, touchkit->data_dma);
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}
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static int touchkit_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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struct touchkit_usb *touchkit;
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struct input_dev *input_dev;
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struct usb_host_interface *interface;
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struct usb_endpoint_descriptor *endpoint;
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struct usb_device *udev = interface_to_usbdev(intf);
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interface = intf->cur_altsetting;
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endpoint = &interface->endpoint[0].desc;
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touchkit = kzalloc(sizeof(struct touchkit_usb), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!touchkit || !input_dev)
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goto out_free;
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if (touchkit_alloc_buffers(udev, touchkit))
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goto out_free;
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touchkit->irq = usb_alloc_urb(0, GFP_KERNEL);
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if (!touchkit->irq) {
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dbg("%s - usb_alloc_urb failed: touchkit->irq", __FUNCTION__);
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goto out_free_buffers;
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}
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touchkit->udev = udev;
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touchkit->input = input_dev;
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if (udev->manufacturer)
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strlcpy(touchkit->name, udev->manufacturer, sizeof(touchkit->name));
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if (udev->product) {
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if (udev->manufacturer)
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strlcat(touchkit->name, " ", sizeof(touchkit->name));
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strlcat(touchkit->name, udev->product, sizeof(touchkit->name));
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}
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if (!strlen(touchkit->name))
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snprintf(touchkit->name, sizeof(touchkit->name),
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"USB Touchscreen %04x:%04x",
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le16_to_cpu(udev->descriptor.idVendor),
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le16_to_cpu(udev->descriptor.idProduct));
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usb_make_path(udev, touchkit->phys, sizeof(touchkit->phys));
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strlcpy(touchkit->phys, "/input0", sizeof(touchkit->phys));
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input_dev->name = touchkit->name;
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input_dev->phys = touchkit->phys;
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usb_to_input_id(udev, &input_dev->id);
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input_dev->cdev.dev = &intf->dev;
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input_dev->private = touchkit;
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input_dev->open = touchkit_open;
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input_dev->close = touchkit_close;
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input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
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input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
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input_set_abs_params(input_dev, ABS_X, TOUCHKIT_MIN_XC, TOUCHKIT_MAX_XC,
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TOUCHKIT_XC_FUZZ, TOUCHKIT_XC_FLAT);
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input_set_abs_params(input_dev, ABS_Y, TOUCHKIT_MIN_YC, TOUCHKIT_MAX_YC,
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TOUCHKIT_YC_FUZZ, TOUCHKIT_YC_FLAT);
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usb_fill_int_urb(touchkit->irq, touchkit->udev,
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usb_rcvintpipe(touchkit->udev, 0x81),
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touchkit->data, TOUCHKIT_REPORT_DATA_SIZE,
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touchkit_irq, touchkit, endpoint->bInterval);
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touchkit->irq->transfer_dma = touchkit->data_dma;
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touchkit->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
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input_register_device(touchkit->input);
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usb_set_intfdata(intf, touchkit);
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return 0;
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out_free_buffers:
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touchkit_free_buffers(udev, touchkit);
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out_free:
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input_free_device(input_dev);
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kfree(touchkit);
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return -ENOMEM;
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}
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static void touchkit_disconnect(struct usb_interface *intf)
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{
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struct touchkit_usb *touchkit = usb_get_intfdata(intf);
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dbg("%s - called", __FUNCTION__);
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if (!touchkit)
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return;
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dbg("%s - touchkit is initialized, cleaning up", __FUNCTION__);
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usb_set_intfdata(intf, NULL);
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usb_kill_urb(touchkit->irq);
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input_unregister_device(touchkit->input);
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usb_free_urb(touchkit->irq);
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touchkit_free_buffers(interface_to_usbdev(intf), touchkit);
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kfree(touchkit);
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}
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MODULE_DEVICE_TABLE(usb, touchkit_devices);
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static struct usb_driver touchkit_driver = {
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.name = "touchkitusb",
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.probe = touchkit_probe,
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.disconnect = touchkit_disconnect,
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.id_table = touchkit_devices,
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};
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static int __init touchkit_init(void)
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{
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return usb_register(&touchkit_driver);
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}
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static void __exit touchkit_cleanup(void)
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{
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usb_deregister(&touchkit_driver);
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}
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module_init(touchkit_init);
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module_exit(touchkit_cleanup);
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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