From c12539f30d0585056be37227a8d65976db49241f Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oliver@neukum.org>
Date: Thu, 24 Jun 2010 08:50:25 +0200
Subject: [PATCH 3/3] usbtouchscreen: Implement reset_resume()
This implements reset_resume() by splitting init into allocations
of private data structures and device initializations. Device initializations
are repeated upon reset_resume.
Signed-off-by: Oliver Neukum <oneukum@suse.de>
---
drivers/input/touchscreen/usbtouchscreen.c | 108 +++++++++++++++++++--------
1 files changed, 76 insertions(+), 32 deletions(-)
@@ -95,6 +95,7 @@ struct usbtouch_device_info {
int (*get_pkt_len) (unsigned char *pkt, int len);
int (*read_data) (struct usbtouch_usb *usbtouch, unsigned char *pkt);
+ int (*alloc) (struct usbtouch_usb *usbtouch);
int (*init) (struct usbtouch_usb *usbtouch);
void (*exit) (struct usbtouch_usb *usbtouch);
};
@@ -507,7 +508,7 @@ static int dmc_tsc10_init(struct usbtouch_usb *usbtouch)
int ret = -ENOMEM;
unsigned char *buf;
- buf = kmalloc(2, GFP_KERNEL);
+ buf = kmalloc(2, GFP_NOIO);
if (!buf)
goto err_nobuf;
/* reset */
@@ -732,11 +733,43 @@ static void nexio_ack_complete(struct urb *urb)
{
}
+static int nexio_alloc(struct usbtouch_usb *usbtouch)
+{
+ struct nexio_priv *priv;
+ int ret = -ENOMEM;
+
+ usbtouch->priv = kmalloc(sizeof(struct nexio_priv), GFP_KERNEL);
+ if (!usbtouch->priv)
+ goto out_buf;
+
+ priv = usbtouch->priv;
+
+ priv->ack_buf = kmemdup(nexio_ack_pkt, sizeof(nexio_ack_pkt),
+ GFP_KERNEL);
+ if (!priv->ack_buf)
+ goto err_priv;
+
+ priv->ack = usb_alloc_urb(0, GFP_KERNEL);
+ if (!priv->ack) {
+ dbg("%s - usb_alloc_urb failed: usbtouch->ack", __func__);
+ goto err_ack_buf;
+ }
+
+ return 0;
+
+err_ack_buf:
+ kfree(priv->ack_buf);
+err_priv:
+ kfree(priv);
+out_buf:
+ return ret;
+}
+
static int nexio_init(struct usbtouch_usb *usbtouch)
{
struct usb_device *dev = interface_to_usbdev(usbtouch->interface);
struct usb_host_interface *interface = usbtouch->interface->cur_altsetting;
- struct nexio_priv *priv;
+ struct nexio_priv *priv = usbtouch->priv;
int ret = -ENOMEM;
int actual_len, i;
unsigned char *buf;
@@ -755,7 +788,7 @@ static int nexio_init(struct usbtouch_usb *usbtouch)
if (!input_ep || !output_ep)
return -ENXIO;
- buf = kmalloc(NEXIO_BUFSIZE, GFP_KERNEL);
+ buf = kmalloc(NEXIO_BUFSIZE, GFP_NOIO);
if (!buf)
goto out_buf;
@@ -787,11 +820,11 @@ static int nexio_init(struct usbtouch_usb *usbtouch)
switch (buf[0]) {
case 0x83: /* firmware version */
if (!firmware_ver)
- firmware_ver = kstrdup(&buf[2], GFP_KERNEL);
+ firmware_ver = kstrdup(&buf[2], GFP_NOIO);
break;
case 0x84: /* device name */
if (!device_name)
- device_name = kstrdup(&buf[2], GFP_KERNEL);
+ device_name = kstrdup(&buf[2], GFP_NOIO);
break;
}
}
@@ -802,36 +835,11 @@ static int nexio_init(struct usbtouch_usb *usbtouch)
kfree(firmware_ver);
kfree(device_name);
- /* prepare ACK URB */
- ret = -ENOMEM;
-
- usbtouch->priv = kmalloc(sizeof(struct nexio_priv), GFP_KERNEL);
- if (!usbtouch->priv)
- goto out_buf;
-
- priv = usbtouch->priv;
-
- priv->ack_buf = kmemdup(nexio_ack_pkt, sizeof(nexio_ack_pkt),
- GFP_KERNEL);
- if (!priv->ack_buf)
- goto err_priv;
-
- priv->ack = usb_alloc_urb(0, GFP_KERNEL);
- if (!priv->ack) {
- dbg("%s - usb_alloc_urb failed: usbtouch->ack", __func__);
- goto err_ack_buf;
- }
-
usb_fill_bulk_urb(priv->ack, dev, usb_sndbulkpipe(dev, output_ep),
priv->ack_buf, sizeof(nexio_ack_pkt),
nexio_ack_complete, usbtouch);
ret = 0;
- goto out_buf;
-err_ack_buf:
- kfree(priv->ack_buf);
-err_priv:
- kfree(priv);
out_buf:
kfree(buf);
return ret;
@@ -1120,6 +1128,7 @@ static struct usbtouch_device_info usbtouch_dev_info[] = {
.rept_size = 1024,
.irq_always = true,
.read_data = nexio_read_data,
+ .alloc = nexio_alloc,
.init = nexio_init,
.exit = nexio_exit,
},
@@ -1330,6 +1339,31 @@ static int usbtouch_resume(struct usb_interface *intf)
return result;
}
+static int usbtouch_reset_resume(struct usb_interface *intf)
+{
+ struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
+ struct input_dev *input = usbtouch->input;
+ int err = 0;
+
+ /* reinit the device */
+ if (usbtouch->type->init) {
+ err = usbtouch->type->init(usbtouch);
+ if (err) {
+ dbg("%s - type->init() failed, err: %d",
+ __func__, err);
+ return err;
+ }
+ }
+
+ /* restart IO if needed */
+ mutex_lock(&input->mutex);
+ if (input->users)
+ err = usb_submit_urb(usbtouch->irq, GFP_NOIO);
+ mutex_unlock(&input->mutex);
+
+ return err;
+}
+
static void usbtouch_free_buffers(struct usb_device *udev,
struct usbtouch_usb *usbtouch)
{
@@ -1449,12 +1483,21 @@ static int usbtouch_probe(struct usb_interface *intf,
usbtouch->irq->transfer_dma = usbtouch->data_dma;
usbtouch->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
- /* device specific init */
+ /* device specific allocations */
+ if (type->alloc) {
+ err = type->alloc(usbtouch);
+ if (err) {
+ dbg("%s - type->alloc() failed, err: %d", __func__, err);
+ goto out_free_urb;
+ }
+ }
+
+ /* device specific initialisation*/
if (type->init) {
err = type->init(usbtouch);
if (err) {
dbg("%s - type->init() failed, err: %d", __func__, err);
- goto out_free_urb;
+ goto out_do_exit;
}
}
@@ -1524,6 +1567,7 @@ static struct usb_driver usbtouch_driver = {
.disconnect = usbtouch_disconnect,
.suspend = usbtouch_suspend,
.resume = usbtouch_resume,
+ .reset_resume = usbtouch_reset_resume,
.id_table = usbtouch_devices,
.supports_autosuspend = 1,
};
--
1.7.1