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Input: usbtouchscreen - add sysfs attribute for 3M MTouch firmware rev 

Allow querying of the firmware revision of the device

example:

4.10

Tested on ZII RDU2 platform and on Intel x86_64 PC.

Signed-off-by: Nick Dyer <nick@shmanahar.org>
Tested-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Nick Dyer 2018-05-15 12:03:12 -07:00 committed by Dmitry Torokhov
parent ff7242ab02
commit 89f84b84d3
1 changed files with 94 additions and 0 deletions
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94
drivers/input/touchscreen/usbtouchscreen.c
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@ -440,6 +440,8 @@ static int panjit_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
#define MTOUCHUSB_RESET 7
#define MTOUCHUSB_REQ_CTRLLR_ID 10
#define MTOUCHUSB_REQ_CTRLLR_ID_LEN 16
static int mtouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
{
if (hwcalib_xy) {
@ -454,11 +456,93 @@ static int mtouch_read_data(struct usbtouch_usb *dev, unsigned char *pkt)
return 1;
}
struct mtouch_priv {
u8 fw_rev_major;
u8 fw_rev_minor;
};
static ssize_t mtouch_firmware_rev_show(struct device *dev,
struct device_attribute *attr, char *output)
{
struct usb_interface *intf = to_usb_interface(dev);
struct usbtouch_usb *usbtouch = usb_get_intfdata(intf);
struct mtouch_priv *priv = usbtouch->priv;
return scnprintf(output, PAGE_SIZE, "%1x.%1x\n",
priv->fw_rev_major, priv->fw_rev_minor);
}
static DEVICE_ATTR(firmware_rev, 0444, mtouch_firmware_rev_show, NULL);
static struct attribute *mtouch_attrs[] = {
&dev_attr_firmware_rev.attr,
NULL
};
static const struct attribute_group mtouch_attr_group = {
.attrs = mtouch_attrs,
};
static int mtouch_get_fw_revision(struct usbtouch_usb *usbtouch)
{
struct usb_device *udev = interface_to_usbdev(usbtouch->interface);
struct mtouch_priv *priv = usbtouch->priv;
u8 *buf;
int ret;
buf = kzalloc(MTOUCHUSB_REQ_CTRLLR_ID_LEN, GFP_NOIO);
if (!buf)
return -ENOMEM;
ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
MTOUCHUSB_REQ_CTRLLR_ID,
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0, 0, buf, MTOUCHUSB_REQ_CTRLLR_ID_LEN,
USB_CTRL_SET_TIMEOUT);
if (ret != MTOUCHUSB_REQ_CTRLLR_ID_LEN) {
dev_warn(&usbtouch->interface->dev,
"Failed to read FW rev: %d\n", ret);
ret = ret < 0 ? ret : -EIO;
goto free;
}
priv->fw_rev_major = buf[3];
priv->fw_rev_minor = buf[4];
ret = 0;
free:
kfree(buf);
return ret;
}
static int mtouch_alloc(struct usbtouch_usb *usbtouch)
{
int ret;
usbtouch->priv = kmalloc(sizeof(struct mtouch_priv), GFP_KERNEL);
if (!usbtouch->priv)
return -ENOMEM;
ret = sysfs_create_group(&usbtouch->interface->dev.kobj,
&mtouch_attr_group);
if (ret) {
kfree(usbtouch->priv);
usbtouch->priv = NULL;
return ret;
}
return 0;
}
static int mtouch_init(struct usbtouch_usb *usbtouch)
{
int ret, i;
struct usb_device *udev = interface_to_usbdev(usbtouch->interface);
ret = mtouch_get_fw_revision(usbtouch);
if (ret)
return ret;
ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
MTOUCHUSB_RESET,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
@ -492,6 +576,14 @@ static int mtouch_init(struct usbtouch_usb *usbtouch)
return 0;
}
static void mtouch_exit(struct usbtouch_usb *usbtouch)
{
struct mtouch_priv *priv = usbtouch->priv;
sysfs_remove_group(&usbtouch->interface->dev.kobj, &mtouch_attr_group);
kfree(priv);
}
#endif
@ -1119,7 +1211,9 @@ static struct usbtouch_device_info usbtouch_dev_info[] = {
.max_yc = 0x4000,
.rept_size = 11,
.read_data = mtouch_read_data,
.alloc = mtouch_alloc,
.init = mtouch_init,
.exit = mtouch_exit,
},
#endif