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HID: wacom: OLEDs control over sysfs for Intuos4

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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@firszt.eu>
Acked-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Przemo Firszt 2012-07-31 18:27:56 +01:00 committed by Jiri Kosina
parent 530a76c14f
commit e3c399ee4a
2 changed files with 156 additions and 0 deletions
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13
Documentation/ABI/testing/sysfs-driver-wacom
View file

@ -1,3 +1,16 @@
WWhat: /sys/class/hidraw/hidraw*/device/oled*_img
Date: June 2012
Contact: linux-bluetooth@vger.kernel.org
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

143
drivers/hid/hid-wacom.c
View file

@ -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);