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path: root/drivers/hid/hid-huion.c
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Diffstat (limited to 'drivers/hid/hid-huion.c')
-rw-r--r--drivers/hid/hid-huion.c128
1 files changed, 78 insertions, 50 deletions
diff --git a/drivers/hid/hid-huion.c b/drivers/hid/hid-huion.c
index 60f44cd1b0ed..61b68ca27790 100644
--- a/drivers/hid/hid-huion.c
+++ b/drivers/hid/hid-huion.c
@@ -84,6 +84,15 @@ static const __u8 huion_tablet_rdesc_template[] = {
0xC0 /* End Collection */
};
+/* Parameter indices */
+enum huion_prm {
+ HUION_PRM_X_LM = 1,
+ HUION_PRM_Y_LM = 2,
+ HUION_PRM_PRESSURE_LM = 4,
+ HUION_PRM_RESOLUTION = 5,
+ HUION_PRM_NUM
+};
+
/* Driver data */
struct huion_drvdata {
__u8 *rdesc;
@@ -115,7 +124,12 @@ static int huion_tablet_enable(struct hid_device *hdev)
int rc;
struct usb_device *usb_dev = hid_to_usb_dev(hdev);
struct huion_drvdata *drvdata = hid_get_drvdata(hdev);
- __le16 buf[6];
+ __le16 *buf = NULL;
+ size_t len;
+ s32 params[HUION_PH_ID_NUM];
+ s32 resolution;
+ __u8 *p;
+ s32 v;
/*
* Read string descriptor containing tablet parameters. The specific
@@ -123,65 +137,79 @@ static int huion_tablet_enable(struct hid_device *hdev)
* driver traffic.
* NOTE: This enables fully-functional tablet mode.
*/
+ len = HUION_PRM_NUM * sizeof(*buf);
+ buf = kmalloc(len, GFP_KERNEL);
+ if (buf == NULL) {
+ hid_err(hdev, "failed to allocate parameter buffer\n");
+ rc = -ENOMEM;
+ goto cleanup;
+ }
rc = usb_control_msg(usb_dev, usb_rcvctrlpipe(usb_dev, 0),
USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
(USB_DT_STRING << 8) + 0x64,
- 0x0409, buf, sizeof(buf),
+ 0x0409, buf, len,
USB_CTRL_GET_TIMEOUT);
- if (rc == -EPIPE)
- hid_warn(hdev, "device parameters not found\n");
- else if (rc < 0)
- hid_warn(hdev, "failed to get device parameters: %d\n", rc);
- else if (rc != sizeof(buf))
- hid_warn(hdev, "invalid device parameters\n");
- else {
- s32 params[HUION_PH_ID_NUM];
- s32 resolution;
- __u8 *p;
- s32 v;
+ if (rc == -EPIPE) {
+ hid_err(hdev, "device parameters not found\n");
+ rc = -ENODEV;
+ goto cleanup;
+ } else if (rc < 0) {
+ hid_err(hdev, "failed to get device parameters: %d\n", rc);
+ rc = -ENODEV;
+ goto cleanup;
+ } else if (rc != len) {
+ hid_err(hdev, "invalid device parameters\n");
+ rc = -ENODEV;
+ goto cleanup;
+ }
- /* Extract device parameters */
- params[HUION_PH_ID_X_LM] = le16_to_cpu(buf[1]);
- params[HUION_PH_ID_Y_LM] = le16_to_cpu(buf[2]);
- params[HUION_PH_ID_PRESSURE_LM] = le16_to_cpu(buf[4]);
- resolution = le16_to_cpu(buf[5]);
- if (resolution == 0) {
- params[HUION_PH_ID_X_PM] = 0;
- params[HUION_PH_ID_Y_PM] = 0;
- } else {
- params[HUION_PH_ID_X_PM] = params[HUION_PH_ID_X_LM] *
- 1000 / resolution;
- params[HUION_PH_ID_Y_PM] = params[HUION_PH_ID_Y_LM] *
- 1000 / resolution;
- }
+ /* Extract device parameters */
+ params[HUION_PH_ID_X_LM] = le16_to_cpu(buf[HUION_PRM_X_LM]);
+ params[HUION_PH_ID_Y_LM] = le16_to_cpu(buf[HUION_PRM_Y_LM]);
+ params[HUION_PH_ID_PRESSURE_LM] =
+ le16_to_cpu(buf[HUION_PRM_PRESSURE_LM]);
+ resolution = le16_to_cpu(buf[HUION_PRM_RESOLUTION]);
+ if (resolution == 0) {
+ params[HUION_PH_ID_X_PM] = 0;
+ params[HUION_PH_ID_Y_PM] = 0;
+ } else {
+ params[HUION_PH_ID_X_PM] = params[HUION_PH_ID_X_LM] *
+ 1000 / resolution;
+ params[HUION_PH_ID_Y_PM] = params[HUION_PH_ID_Y_LM] *
+ 1000 / resolution;
+ }
- /* Allocate fixed report descriptor */
- drvdata->rdesc = devm_kmalloc(&hdev->dev,
- sizeof(huion_tablet_rdesc_template),
- GFP_KERNEL);
- if (drvdata->rdesc == NULL) {
- hid_err(hdev, "failed to allocate fixed rdesc\n");
- return -ENOMEM;
- }
- drvdata->rsize = sizeof(huion_tablet_rdesc_template);
+ /* Allocate fixed report descriptor */
+ drvdata->rdesc = devm_kmalloc(&hdev->dev,
+ sizeof(huion_tablet_rdesc_template),
+ GFP_KERNEL);
+ if (drvdata->rdesc == NULL) {
+ hid_err(hdev, "failed to allocate fixed rdesc\n");
+ rc = -ENOMEM;
+ goto cleanup;
+ }
+ drvdata->rsize = sizeof(huion_tablet_rdesc_template);
- /* Format fixed report descriptor */
- memcpy(drvdata->rdesc, huion_tablet_rdesc_template,
- drvdata->rsize);
- for (p = drvdata->rdesc;
- p <= drvdata->rdesc + drvdata->rsize - 4;) {
- if (p[0] == 0xFE && p[1] == 0xED && p[2] == 0x1D &&
- p[3] < sizeof(params)) {
- v = params[p[3]];
- put_unaligned(cpu_to_le32(v), (s32 *)p);
- p += 4;
- } else {
- p++;
- }
+ /* Format fixed report descriptor */
+ memcpy(drvdata->rdesc, huion_tablet_rdesc_template,
+ drvdata->rsize);
+ for (p = drvdata->rdesc;
+ p <= drvdata->rdesc + drvdata->rsize - 4;) {
+ if (p[0] == 0xFE && p[1] == 0xED && p[2] == 0x1D &&
+ p[3] < sizeof(params)) {
+ v = params[p[3]];
+ put_unaligned(cpu_to_le32(v), (s32 *)p);
+ p += 4;
+ } else {
+ p++;
}
}
- return 0;
+ rc = 0;
+
+cleanup:
+ kfree(buf);
+ return rc;
}
static int huion_probe(struct hid_device *hdev, const struct hid_device_id *id)