From 89f84b84d3514044a4cc13f18efd503c9d24f812 Mon Sep 17 00:00:00 2001 From: Nick Dyer Date: Tue, 15 May 2018 12:03:12 -0700 Subject: 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 Tested-by: Nikita Yushchenko Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/usbtouchscreen.c | 94 ++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) (limited to 'drivers/input/touchscreen/usbtouchscreen.c') diff --git a/drivers/input/touchscreen/usbtouchscreen.c b/drivers/input/touchscreen/usbtouchscreen.c index c6cf90868503..d61570d64ee7 100644 --- a/drivers/input/touchscreen/usbtouchscreen.c +++ b/drivers/input/touchscreen/usbtouchscreen.c @@ -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 -- cgit v1.2.1