AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-11-24 19:10:52 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

HID: elo: add quirks for broken firmware

Browse Source 
One firmare version in the devices the driver takes care of is
completely broken and needs periodic pokes from our side. We
implemented this as a periodic delayed queue. The idea of the pokes
was taken from the suse enterprise kernel, in particular from Libor's
"Elo touchscreen firmware M workaround".

I am quoting him here:
  This patch adds periodic polling of the Elo USB touchscreens. Needed
  as a workaround for devices with M-level firmware, otherwise these
  devices are known to misbehave (as reported by Elo developers).

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Tested-by: Petr Ostadal <postadal@suse.cz>
Cc: Oliver Neukum <oliver@neukum.org>
Cc: Vojtech Pavlik <vojtech@suse.cz>
Cc: Egbert Eich <eich@suse.com>
Cc: Libor Pechacek <lpechacek@suse.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Jiri Slaby 2013-05-07 11:40:59 +02:00 committed by Jiri Kosina
parent d23efc1947
commit d8e5aec8d9
1 changed files with 143 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

144
drivers/hid/hid-elo.c
View File

@ -11,9 +11,32 @@
#include <linux/hid.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/workqueue.h>
#include "hid-ids.h"
#define ELO_PERIODIC_READ_INTERVAL HZ
#define ELO_SMARTSET_CMD_TIMEOUT 2000 /* msec */
/* Elo SmartSet commands */
#define ELO_FLUSH_SMARTSET_RESPONSES 0x02 /* Flush all pending smartset responses */
#define ELO_SEND_SMARTSET_COMMAND 0x05 /* Send a smartset command */
#define ELO_GET_SMARTSET_RESPONSE 0x06 /* Get a smartset response */
#define ELO_DIAG 0x64 /* Diagnostics command */
#define ELO_SMARTSET_PACKET_SIZE 8
struct elo_priv {
struct usb_device *usbdev;
struct delayed_work work;
unsigned char buffer[ELO_SMARTSET_PACKET_SIZE];
};
static struct workqueue_struct *wq;
static bool use_fw_quirk = true;
module_param(use_fw_quirk, bool, S_IRUGO);
MODULE_PARM_DESC(use_fw_quirk, "Do periodic pokes for broken M firmwares (default = true)");
static void elo_input_configured(struct hid_device *hdev,
struct hid_input *hidinput)
{
@ -73,10 +96,108 @@ static int elo_raw_event(struct hid_device *hdev, struct hid_report *report,
return 0;
}
static int elo_smartset_send_get(struct usb_device *dev, u8 command,
void *data)
{
unsigned int pipe;
u8 dir;
if (command == ELO_SEND_SMARTSET_COMMAND) {
pipe = usb_sndctrlpipe(dev, 0);
dir = USB_DIR_OUT;
} else if (command == ELO_GET_SMARTSET_RESPONSE) {
pipe = usb_rcvctrlpipe(dev, 0);
dir = USB_DIR_IN;
} else
return -EINVAL;
return usb_control_msg(dev, pipe, command,
dir | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0, 0, data, ELO_SMARTSET_PACKET_SIZE,
ELO_SMARTSET_CMD_TIMEOUT);
}
static int elo_flush_smartset_responses(struct usb_device *dev)
{
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
ELO_FLUSH_SMARTSET_RESPONSES,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0, 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
}
static void elo_work(struct work_struct *work)
{
struct elo_priv *priv = container_of(work, struct elo_priv, work.work);
struct usb_device *dev = priv->usbdev;
unsigned char *buffer = priv->buffer;
int ret;
ret = elo_flush_smartset_responses(dev);
if (ret < 0) {
dev_err(&dev->dev, "initial FLUSH_SMARTSET_RESPONSES failed, error %d\n",
ret);
goto fail;
}
/* send Diagnostics command */
*buffer = ELO_DIAG;
ret = elo_smartset_send_get(dev, ELO_SEND_SMARTSET_COMMAND, buffer);
if (ret < 0) {
dev_err(&dev->dev, "send Diagnostics Command failed, error %d\n",
ret);
goto fail;
}
/* get the result */
ret = elo_smartset_send_get(dev, ELO_GET_SMARTSET_RESPONSE, buffer);
if (ret < 0) {
dev_err(&dev->dev, "get Diagnostics Command response failed, error %d\n",
ret);
goto fail;
}
/* read the ack */
if (*buffer != 'A') {
ret = elo_smartset_send_get(dev, ELO_GET_SMARTSET_RESPONSE,
buffer);
if (ret < 0) {
dev_err(&dev->dev, "get acknowledge response failed, error %d\n",
ret);
goto fail;
}
}
fail:
ret = elo_flush_smartset_responses(dev);
if (ret < 0)
dev_err(&dev->dev, "final FLUSH_SMARTSET_RESPONSES failed, error %d\n",
ret);
queue_delayed_work(wq, &priv->work, ELO_PERIODIC_READ_INTERVAL);
}
/*
* Not all Elo devices need the periodic HID descriptor reads.
* Only firmware version M needs this.
*/
static bool elo_broken_firmware(struct usb_device *dev)
{
return use_fw_quirk && le16_to_cpu(dev->descriptor.bcdDevice) == 0x10d;
}
static int elo_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
struct elo_priv *priv;
int ret;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
INIT_DELAYED_WORK(&priv->work, elo_work);
priv->usbdev = interface_to_usbdev(to_usb_interface(hdev->dev.parent));
hid_set_drvdata(hdev, priv);
ret = hid_parse(hdev);
if (ret) {
hid_err(hdev, "parse failed\n");
@ -89,14 +210,24 @@ static int elo_probe(struct hid_device *hdev, const struct hid_device_id *id)
goto err_free;
}
if (elo_broken_firmware(priv->usbdev)) {
hid_info(hdev, "broken firmware found, installing workaround\n");
queue_delayed_work(wq, &priv->work, ELO_PERIODIC_READ_INTERVAL);
}
return 0;
err_free:
kfree(priv);
return ret;
}
static void elo_remove(struct hid_device *hdev)
{
struct elo_priv *priv = hid_get_drvdata(hdev);
hid_hw_stop(hdev);
flush_workqueue(wq);
kfree(priv);
}
static const struct hid_device_id elo_devices[] = {
@ -117,13 +248,24 @@ static struct hid_driver elo_driver = {
static int __init elo_driver_init(void)
{
return hid_register_driver(&elo_driver);
int ret;
wq = create_singlethread_workqueue("elousb");
if (!wq)
return -ENOMEM;
ret = hid_register_driver(&elo_driver);
if (ret)
destroy_workqueue(wq);
return ret;
}
module_init(elo_driver_init);
static void __exit elo_driver_exit(void)
{
hid_unregister_driver(&elo_driver);
destroy_workqueue(wq);
}
module_exit(elo_driver_exit);