[PATCH 2/2] HID: wacom: OLEDs control over sysfs for Intuos4
From: Przemo Firszt
Date: Tue Jul 31 2012 - 14:20:22 EST
Thsi patch adds ability to control OLED micro displays on Wacom Intuos4
Wireless. The OLEDS are exposed as
/sys/class/hidraw/hidraw*/device/oled{No]_img
where No. is 0 to 7
Setting an image:
dd bs=256 if=img_file of=/sys/class/hidraw/hidraw{No}/device/oled0_img
The image has to contain 256 bytes (64x32px 1 bit). More detailed
description in Documentation/ABI/testing/sysfs-driver-wacom
Signed-off-by: Przemo Firszt <przemo@xxxxxxxxx>
---
Documentation/ABI/testing/sysfs-driver-wacom | 13 +++
drivers/hid/hid-wacom.c | 143 ++++++++++++++++++++++++++
2 files changed, 156 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-driver-wacom b/Documentation/ABI/testing/sysfs-driver-wacom
index 8d55a83..7fc7810 100644
--- a/Documentation/ABI/testing/sysfs-driver-wacom
+++ b/Documentation/ABI/testing/sysfs-driver-wacom
@@ -1,3 +1,16 @@
+WWhat: /sys/class/hidraw/hidraw*/device/oled*_img
+Date: June 2012
+Contact: linux-bluetooth@xxxxxxxxxxxxxxx
+Description:
+ The /sys/class/hidraw/hidraw*/device/oled*_img files control
+ OLED mocro displays on Intuos4 Wireless tablet. Accepted image
+ has to contain 256 bytes (64x32 px 1 bit colour). The format
+ is the same as PBM image 62x32px without header (64 bits per
+ horizontal line, 32 lines). An example of setting OLED No. 0:
+ dd bs=256 count=1 if=img_file of=[path to oled0_img]/oled0_img
+ The attribute is read only and no local copy of the image is
+ stored.
+
What: /sys/class/hidraw/hidraw*/device/speed
Date: April 2010
Kernel Version: 2.6.35
diff --git a/drivers/hid/hid-wacom.c b/drivers/hid/hid-wacom.c
index 848842e..8effb8b 100644
--- a/drivers/hid/hid-wacom.c
+++ b/drivers/hid/hid-wacom.c
@@ -33,6 +33,8 @@
#define PAD_DEVICE_ID 0x0F
#define WAC_CMD_LED_CONTROL 0x20
+#define WAC_CMD_ICON_START_STOP 0x21
+#define WAC_CMD_ICON_TRANSFER 0x26
struct wacom_data {
__u16 tool;
@@ -69,6 +71,91 @@ static enum power_supply_property wacom_ac_props[] = {
POWER_SUPPLY_PROP_SCOPE,
};
+static void wacom_scramble(__u8 *image)
+{
+ __u16 mask;
+ __u16 s1;
+ __u16 s2;
+ __u16 r1 ;
+ __u16 r2 ;
+ __u16 r;
+ __u8 buf[256];
+ int i, w, x, y, z;
+
+ for (x = 0; x < 32; x++) {
+ for (y = 0; y < 8; y++)
+ buf[(8 * x) + (7 - y)] = image[(8 * x) + y];
+ }
+
+ /* Change 76543210 into GECA6420 as required by Intuos4 WL
+ * HGFEDCBA HFDB7531
+ */
+ for (x = 0; x < 4; x++) {
+ for (y = 0; y < 4; y++) {
+ for (z = 0; z < 8; z++) {
+ mask = 0x0001;
+ r1 = 0;
+ r2 = 0;
+ i = (x << 6) + (y << 4) + z;
+ s1 = buf[i];
+ s2 = buf[i+8];
+ for (w = 0; w < 8; w++) {
+ r1 |= (s1 & mask);
+ r2 |= (s2 & mask);
+ s1 <<= 1;
+ s2 <<= 1;
+ mask <<= 2;
+ }
+ r = r1 | (r2 << 1);
+ i = (x << 6) + (y << 4) + (z << 1);
+ image[i] = 0xFF & r;
+ image[i+1] = (0xFF00 & r) >> 8;
+ }
+ }
+ }
+}
+
+static void wacom_set_image(struct hid_device *hdev, const char *image,
+ __u8 icon_no)
+{
+ __u8 rep_data[68];
+ __u8 p[256];
+ int ret, i, j;
+
+ for (i = 0; i < 256; i++)
+ p[i] = image[i];
+
+ rep_data[0] = WAC_CMD_ICON_START_STOP;
+ rep_data[1] = 0;
+ ret = hdev->hid_output_raw_report(hdev, rep_data, 2,
+ HID_FEATURE_REPORT);
+ if (ret < 0)
+ goto err;
+
+ rep_data[0] = WAC_CMD_ICON_TRANSFER;
+ rep_data[1] = icon_no & 0x07;
+
+ wacom_scramble(p);
+
+ for (i = 0; i < 4; i++) {
+ for (j = 0; j < 64; j++)
+ rep_data[j + 3] = p[(i << 6) + j];
+
+ rep_data[2] = i;
+ ret = hdev->hid_output_raw_report(hdev, rep_data, 67,
+ HID_FEATURE_REPORT);
+ }
+
+ rep_data[0] = WAC_CMD_ICON_START_STOP;
+ rep_data[1] = 0;
+
+ ret = hdev->hid_output_raw_report(hdev, rep_data, 2,
+ HID_FEATURE_REPORT);
+
+err:
+ return;
+}
+
static void wacom_leds_set_brightness(struct led_classdev *led_dev,
enum led_brightness value)
{
@@ -93,6 +180,8 @@ static void wacom_leds_set_brightness(struct led_classdev *led_dev,
buf[1] = led;
buf[2] = value >> 2;
buf[3] = value;
+ /* use fixed brightness for OLEDs */
+ buf[4] = 0x08;
hdev->hid_output_raw_report(hdev, buf, 9, HID_FEATURE_REPORT);
kfree(buf);
}
@@ -318,6 +407,34 @@ static ssize_t wacom_store_speed(struct device *dev,
static DEVICE_ATTR(speed, S_IRUGO | S_IWUSR | S_IWGRP,
wacom_show_speed, wacom_store_speed);
+#define WACOM_STORE(OLED_ID) \
+static ssize_t wacom_oled##OLED_ID##_store(struct device *dev, \
+ struct device_attribute *attr, \
+ const char *buf, size_t count) \
+{ \
+ struct hid_device *hdev = container_of(dev, struct hid_device, \
+ dev); \
+ \
+ if (count != 256) \
+ return -EINVAL; \
+ \
+ wacom_set_image(hdev, buf, OLED_ID); \
+ \
+ return count; \
+} \
+ \
+static DEVICE_ATTR(oled##OLED_ID##_img, S_IWUSR | S_IWGRP, NULL, \
+ wacom_oled##OLED_ID##_store)
+
+WACOM_STORE(0);
+WACOM_STORE(1);
+WACOM_STORE(2);
+WACOM_STORE(3);
+WACOM_STORE(4);
+WACOM_STORE(5);
+WACOM_STORE(6);
+WACOM_STORE(7);
+
static int wacom_gr_parse_report(struct hid_device *hdev,
struct wacom_data *wdata,
struct input_dev *input, unsigned char *data)
@@ -718,6 +835,24 @@ static int wacom_probe(struct hid_device *hdev,
hid_warn(hdev,
"can't create sysfs speed attribute err: %d\n", ret);
+#define OLED_INIT(OLED_ID) \
+ do { \
+ ret = device_create_file(&hdev->dev, \
+ &dev_attr_oled##OLED_ID##_img); \
+ if (ret) \
+ hid_warn(hdev, \
+ "can't create sysfs oled attribute, err: %d\n", ret);\
+ } while (0)
+
+OLED_INIT(0);
+OLED_INIT(1);
+OLED_INIT(2);
+OLED_INIT(3);
+OLED_INIT(4);
+OLED_INIT(5);
+OLED_INIT(6);
+OLED_INIT(7);
+
wdata->features = 0;
wacom_set_features(hdev, 1);
@@ -782,6 +917,14 @@ static void wacom_remove(struct hid_device *hdev)
struct wacom_data *wdata = hid_get_drvdata(hdev);
wacom_destroy_leds(hdev);
+ device_remove_file(&hdev->dev, &dev_attr_oled0_img);
+ device_remove_file(&hdev->dev, &dev_attr_oled1_img);
+ device_remove_file(&hdev->dev, &dev_attr_oled2_img);
+ device_remove_file(&hdev->dev, &dev_attr_oled3_img);
+ device_remove_file(&hdev->dev, &dev_attr_oled4_img);
+ device_remove_file(&hdev->dev, &dev_attr_oled5_img);
+ device_remove_file(&hdev->dev, &dev_attr_oled6_img);
+ device_remove_file(&hdev->dev, &dev_attr_oled7_img);
device_remove_file(&hdev->dev, &dev_attr_speed);
hid_hw_stop(hdev);
--
1.7.10.2
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