Staging: add asus_oled driver

Driver for the OLED tiny display on some Asus laptops.

From: Jakub Schmidtke <sjakub@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/Kconfig

@@ -73,5 +73,7 @@ source "drivers/staging/benet/Kconfig"
 
 source "drivers/staging/comedi/Kconfig"
 
+source "drivers/staging/asus_oled/Kconfig"
+
 endif # !STAGING_EXCLUDE_BUILD
 endif # STAGING

drivers/staging/Makefile

@@ -19,3 +19,4 @@ obj-$(CONFIG_OTUS)		+= otus/
 obj-$(CONFIG_RT2860)		+= rt2860/
 obj-$(CONFIG_BENET)		+= benet/
 obj-$(CONFIG_COMEDI)		+= comedi/
+obj-$(CONFIG_ASUS_OLED)		+= asus_oled/

drivers/staging/asus_oled/Kconfig

+config ASUS_OLED
+	tristate "Asus OLED driver"
+	default N
+	---help---
+	  Enable support for the OLED display present in some Asus laptops.

drivers/staging/asus_oled/Makefile

+obj-$(CONFIG_ASUS_OLED)		+= asus_oled.o

drivers/staging/asus_oled/README

+
+    Driver for Asus OLED display present in some Asus laptops.
+
+    The code of this driver is based on 'asusoled' program taken from
+    https://launchpad.net/asusoled/. I just wanted to have a simple
+    kernel driver for controlling this device, but I didn't know how
+    to do that. Now I know ;) Also, that program can not be used
+    with usbhid loaded, which means no USB mouse/keyboard while
+    controlling OLED display :(
+
+    It has been tested on Asus G1 and didn't cause any problems,
+    but I don't guarantee that it won't do anything wrong :)
+
+    It can (and probably does) have errors. It is usable
+    in my case, and I hope others will find it useful too!
+
+*******
+
+Building the module
+
+   To build the module you need kernel 2.6 include files and some C compiler.
+
+   Just run:
+   make
+   make install (as a root)
+
+   It will build (hopefully) the module and install it in
+   /lib/modules/'uname -r'/extra/asus_oled.ko.
+
+   To load it just use:
+   modprobe asus_oled
+
+   You can check if it has detected your OLED display by looking into dmesg output.
+   There should be something like this:
+   asus-oled 2-7:1.0: Attached Asus OLED device
+
+   If it doesn't find your display, you can try removing usbhid module.
+   If you add asus_oled into the list of modules loaded during system boot
+   before usbhid, it will work even when usbhid is present.
+
+   If it still doesn't detect your hardware, check lsusb output.
+   There should be similar line:
+   Bus 002 Device 005: ID 0b05:1726 ASUSTek Computer, Inc.
+
+   If you don't see any lines with '0b05:1726' it means that you have different
+   type of hardware that is not detected (it may or may not work, but the driver
+   knows only '0b05:1726' device).
+
+*******
+
+Configuration
+
+   There is only one option: start_off.
+   You can use it by: 'modprobe asus_oled start_off=1', or by adding this
+   line to /etc/modprobe.conf:
+   options asus_oled start_off=1
+
+   With this option provided, asus_oled driver will switch off the display
+   when it is detected and attached. It is nice feature to just switch off the 'ASUS'
+   logo. If you don't use the display, it is probably the good idea to switch it off,
+   to protect OLEDs from "wearing off".
+
+*******
+
+Usage
+
+   This module can be controlled with two special files:
+   /sys/class/asus_oled/oled_N/enabled
+   /sys/class/asus_oled/oled_N/picture
+
+   (N is the device number, the first, and probably the only, has number 1,
+    so it is /sys/class/asus_oled/oled_1/enabled
+    and /sys/class/asus_oled/oled_1/picture)
+
+   'enabled' files is for reading and writing, 'picture' is writeable only.
+
+   You can write 0 or 1 to 'enabled' file, which will switch
+   on and off the display. Reading from this file will tell you the last
+   status set, either 0 or 1. By default it is 1, so if the device was set to 'off',
+   and the computer was rebooted without power-off, this file will contain wrong
+   value - because the device is off, but hasn't been disabled this time and is
+   assumed to be on...
+
+   To 'picture' file you write pictures to be displayed by the OLED device.
+   The format of the file:
+   <M:WxH>
+   00001110010111000
+   00010101010101010
+   ....
+
+   First line is a configuration parameter. Meaning of fields in <M:WxH>:
+   M - picture mode. It can be either 's' for static pictures,
+       'r' for rolling pictures, and 'f' for flashing pictures.
+   W - width of the picture. May be between 1 and 1792
+   H - height of the picture. May be between 1 and 32
+
+   For example <s:128x32> means static picture, 128 pixels long and 32 pixels high.
+
+   The physical size of the display is 128x32 pixels. Static and flashing pictures
+   can't be larger than that (actually they can, but only part of them will be displayed ;) )
+
+   If the picture is smaller than 128x32 it will be centered. Rolling pictures wider than
+   128 pixels will be centered too, unless their width = n*128. Vertically they will be
+   centered just like static pictures, if their height is smaller than 32.
+
+   Flashing pictures will be centered horizontally if their width < 128, but they were
+   centered vertically in a different way. If their height < 16, they will be centered
+   in the upper half of the display (rows 0-15). This is because only the first half
+   of flashing pictures is used for flashing. When the picture with heigh = 32 is
+   displayed in flashing mode, its upper 16 rows will be flashing in the upper half
+   of the display, and the lower half will be empty. After few seconds upper part will
+   stop flashing (but that part of the picture will remain there), and the lower
+   half of the display will start displayin the lower half of the picture
+   in rolling mode, unless it is empty, or the picture was small enough to fit in
+   upper part. It is not mine idea, this is just the way Asus' display work ;)
+   So if you need just flashing, use at most 128x16 picture. If you need flashing and
+   rolling, use whole size of the display.
+
+   Lines following the first, configuration, line are picture data. Each '1' means
+   that the pixel is lit, and '0' means that it is not. You can also use '#' as ON,
+   and ' ' (space) as OFF. Empty lines and all other characters are ignored.
+
+   It is possible to write everything in one line <M:WxH>01010101010101010...,
+   and W*H characters will be used. If there is not enough characters, nothing will be
+   displayed. However, the 'line mode' is easier to read (and write), and it also
+   lets to omit parts of data. Whenever End-Of-Line character is found, but
+   the line is not W characters long, it is assumed that all missing characters
+   are equal to the last character in the line.
+
+   Following line represents '0', '1' and a lots of '0's, dependng on the width of the picture
+   provided in configuration data:
+   010
+
+   So if you need empty line, it is sufficient to write line with only one '0' in it.
+   The same works with '1' (or ' ' and '#').
+
+   If there are too many data in the file, they will be ignored. If you are not sure
+   how many characters you are missing, you can add few lines with one zero in each of them.
+
+   There are some example pictures in .txt format, that can be used as follows:
+   cat foo.txt > /sys/class/asus_oled/oled_1/picture
+
+   If the display is switched off you also need to run:
+   echo 1 > /sys/class/asus_oled/oled_1/enabled
+   To switch it off, just use:
+   echo 0 > /sys/class/asus_oled/oled_1/enabled
+
+
+*******
+
+   For any additional info please have a look at http://lapsus.berlios.de/asus_oled.html
+
+
+
+   Jakub Schmidtke (sjakub@gmail.com)
+

drivers/staging/asus_oled/TODO

+TODO:
+	- checkpatch.pl cleanups
+	- sparse fixes
+	- audit the userspace interface
+		- sysfs vs. char?
+	- Documentation/ABI/ needs to be added
+	- put the sample .txt files and README file somewhere.
+
+Please send patches to Greg Kroah-Hartman <greg@kroah.com> and
+Cc: Jakub Schmidtke <sjakub@gmail.com>

drivers/staging/asus_oled/asus_oled.c

+/*
+ *  Asus OLED USB driver
+ *
+ *  Copyright (C) 2007,2008 Jakub Schmidtke (sjakub@gmail.com)
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ *
+ *
+ *  This module is based on usbled and asus-laptop modules.
+ *
+ *
+ *  Asus OLED support is based on asusoled program taken from
+ *  https://launchpad.net/asusoled/.
+ *
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/platform_device.h>
+#include <linux/ctype.h>
+
+#define ASUS_OLED_VERSION		"0.04-dev"
+#define ASUS_OLED_NAME			"asus-oled"
+#define ASUS_OLED_UNDERSCORE_NAME	"asus_oled"
+
+#define ASUS_OLED_ERROR			"Asus OLED Display Error: "
+
+#define ASUS_OLED_STATIC		's'
+#define ASUS_OLED_ROLL			'r'
+#define ASUS_OLED_FLASH			'f'
+
+#define ASUS_OLED_MAX_WIDTH		1792
+#define ASUS_OLED_DISP_HEIGHT		32
+#define ASUS_OLED_PACKET_BUF_SIZE	256
+
+MODULE_AUTHOR("Jakub Schmidtke, sjakub@gmail.com");
+MODULE_DESCRIPTION("Asus OLED Driver v" ASUS_OLED_VERSION);
+MODULE_LICENSE("GPL");
+
+static struct class *oled_class = 0;
+static int oled_num = 0;
+
+static uint start_off = 0;
+
+module_param(start_off, uint, 0644);
+
+MODULE_PARM_DESC(start_off, "Set to 1 to switch off OLED display after it is attached");
+
+typedef enum {
+	PACK_MODE_G1,
+	PACK_MODE_G50,
+	PACK_MODE_LAST
+} oled_pack_mode_t;
+
+struct oled_dev_desc_str {
+	uint16_t		idVendor;
+	uint16_t		idProduct;
+	uint16_t		devWidth; // width of display
+	oled_pack_mode_t	packMode; // formula to be used while packing the picture
+	const char		*devDesc;
+};
+
+/* table of devices that work with this driver */
+static struct usb_device_id id_table [] = {
+	{ USB_DEVICE(0x0b05, 0x1726) }, // Asus G1/G2 (and variants)
+	{ USB_DEVICE(0x0b05, 0x175b) }, // Asus G50V (and possibly others - G70? G71?)
+	{ },
+};
+
+/* parameters of specific devices */
+static struct oled_dev_desc_str oled_dev_desc_table [] = {
+	{ 0x0b05, 0x1726, 128, PACK_MODE_G1, "G1/G2" },
+	{ 0x0b05, 0x175b, 256, PACK_MODE_G50, "G50" },
+	{ },
+};
+
+MODULE_DEVICE_TABLE (usb, id_table);
+
+#define SETUP_PACKET_HEADER(packet, val1, val2, val3, val4, val5, val6, val7) \
+	do {					\
+		memset(packet, 0, sizeof(struct asus_oled_header));		\
+		packet->header.magic1 = 0x55;		\
+		packet->header.magic2 = 0xaa;		\
+		packet->header.flags = val1;		\
+		packet->header.value3 = val2;		\
+		packet->header.buffer1 = val3;		\
+		packet->header.buffer2 = val4;		\
+		packet->header.value6 = val5;		\
+		packet->header.value7 = val6;		\
+		packet->header.value8 = val7;		\
+	} while(0);
+
+struct asus_oled_header {
+	uint8_t		magic1;
+	uint8_t		magic2;
+	uint8_t		flags;
+	uint8_t		value3;
+	uint8_t		buffer1;
+	uint8_t		buffer2;
+	uint8_t		value6;
+	uint8_t		value7;
+	uint8_t		value8;
+	uint8_t		padding2[7];
+} __attribute((packed));
+
+struct asus_oled_packet {
+	struct asus_oled_header		header;
+	uint8_t				bitmap[ASUS_OLED_PACKET_BUF_SIZE];
+} __attribute((packed));
+
+struct asus_oled_dev {
+	struct usb_device *	udev;
+	uint8_t			pic_mode;
+	uint16_t		dev_width;
+	oled_pack_mode_t	pack_mode;
+	size_t			height;
+	size_t			width;
+	size_t			x_shift;
+	size_t			y_shift;
+	size_t			buf_offs;
+	uint8_t			last_val;
+	size_t			buf_size;
+	char			*buf;
+	uint8_t			enabled;
+	struct device		*dev;
+};
+
+static void enable_oled(struct asus_oled_dev *odev, uint8_t enabl)
+{
+	int a;
+	int retval;
+	int act_len;
+	struct asus_oled_packet * packet;
+
+	packet = kzalloc(sizeof(struct asus_oled_packet), GFP_KERNEL);
+
+	if (!packet) {
+		dev_err(&odev->udev->dev, "out of memory\n");
+		return;
+	}
+
+	SETUP_PACKET_HEADER(packet, 0x20, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00);
+
+	if (enabl) packet->bitmap[0] = 0xaf;
+	else packet->bitmap[0] = 0xae;
+
+	for (a=0; a<1; a++) {
+		retval = usb_bulk_msg(odev->udev,
+			usb_sndbulkpipe(odev->udev, 2),
+			packet,
+			sizeof(struct asus_oled_header) + 1,
+			&act_len,
+			-1);
+
+		if (retval)
+			dev_dbg(&odev->udev->dev, "retval = %d\n", retval);
+	}
+
+	odev->enabled = enabl;
+
+	kfree(packet);
+}
+
+static ssize_t set_enabled(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct usb_interface *intf = to_usb_interface(dev);
+	struct asus_oled_dev *odev = usb_get_intfdata(intf);
+	int temp = simple_strtoul(buf, NULL, 10);
+
+	enable_oled(odev, temp);
+
+	return count;
+}
+
+static ssize_t class_set_enabled(struct device *device, struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct asus_oled_dev *odev = (struct asus_oled_dev *) dev_get_drvdata(device);
+
+	int temp = simple_strtoul(buf, NULL, 10);
+
+	enable_oled(odev, temp);
+
+	return count;
+}
+
+static ssize_t get_enabled(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct usb_interface *intf = to_usb_interface(dev);
+	struct asus_oled_dev *odev = usb_get_intfdata(intf);
+
+	return sprintf(buf, "%d\n", odev->enabled);
+}
+
+static ssize_t class_get_enabled(struct device *device, struct device_attribute *attr, char *buf)
+{
+	struct asus_oled_dev *odev = (struct asus_oled_dev *) dev_get_drvdata(device);
+
+	return sprintf(buf, "%d\n", odev->enabled);
+}
+
+static void send_packets(struct usb_device *udev, struct asus_oled_packet *packet,
+	char *buf, uint8_t p_type, size_t p_num)
+{
+	size_t i;
+	int act_len;
+
+	for (i = 0; i < p_num; i++) {
+		int retval;
+
+		switch (p_type) {
+			case ASUS_OLED_ROLL:
+				SETUP_PACKET_HEADER(packet, 0x40, 0x80, p_num, i + 1, 0x00, 0x01, 0xff);
+			break;
+			case ASUS_OLED_STATIC:
+				SETUP_PACKET_HEADER(packet, 0x10 + i, 0x80, 0x01, 0x01, 0x00, 0x01, 0x00);
+			break;
+			case ASUS_OLED_FLASH:
+				SETUP_PACKET_HEADER(packet, 0x10 + i, 0x80, 0x01, 0x01, 0x00, 0x00, 0xff);
+			break;
+		}
+
+		memcpy(packet->bitmap, buf + (ASUS_OLED_PACKET_BUF_SIZE*i), ASUS_OLED_PACKET_BUF_SIZE);
+
+		retval = usb_bulk_msg(udev,
+			usb_sndctrlpipe(udev, 2),
+			packet,
+			sizeof(struct asus_oled_packet),
+			&act_len,
+			-1);
+
+		if (retval)
+			dev_dbg(&udev->dev, "retval = %d\n", retval);
+	}
+}
+
+static void send_packet(struct usb_device *udev, struct asus_oled_packet *packet, size_t offset, size_t len, char *buf, uint8_t b1, uint8_t b2, uint8_t b3, uint8_t b4, uint8_t b5, uint8_t b6){
+	int retval;
+	int act_len;
+
+	SETUP_PACKET_HEADER(packet, b1, b2, b3, b4, b5, b6, 0x00);
+	memcpy(packet->bitmap, buf + offset, len);
+
+	retval = usb_bulk_msg(udev,
+			usb_sndctrlpipe(udev, 2),
+			packet,
+			sizeof(struct asus_oled_packet),
+			&act_len,
+			-1);
+
+	if (retval)
+		dev_dbg(&udev->dev, "retval = %d\n", retval);
+}
+
+
+static void send_packets_g50(struct usb_device *udev, struct asus_oled_packet *packet, char *buf)
+{
+	send_packet(udev, packet,     0, 0x100, buf, 0x10, 0x00, 0x02, 0x01, 0x00, 0x01);
+	send_packet(udev, packet, 0x100, 0x080, buf, 0x10, 0x00, 0x02, 0x02, 0x80, 0x00);
+
+	send_packet(udev, packet, 0x180, 0x100, buf, 0x11, 0x00, 0x03, 0x01, 0x00, 0x01);
+	send_packet(udev, packet, 0x280, 0x100, buf, 0x11, 0x00, 0x03, 0x02, 0x00, 0x01);
+	send_packet(udev, packet, 0x380, 0x080, buf, 0x11, 0x00, 0x03, 0x03, 0x80, 0x00);
+}
+
+
+static void send_data(struct asus_oled_dev *odev)
+{
+	size_t packet_num = odev->buf_size / ASUS_OLED_PACKET_BUF_SIZE;
+	struct asus_oled_packet * packet;
+
+	packet = kzalloc(sizeof(struct asus_oled_packet), GFP_KERNEL);
+
+	if (!packet) {
+		dev_err(&odev->udev->dev, "out of memory\n");
+		return;
+	}
+
+	if (odev->pack_mode==PACK_MODE_G1){
+		// When sending roll-mode data the display updated only first packet.
+		// I have no idea why, but when static picture is send just before
+		// rolling picture - everything works fine.
+		if (odev->pic_mode == ASUS_OLED_ROLL)
+			send_packets(odev->udev, packet, odev->buf, ASUS_OLED_STATIC, 2);
+
+		// Only ROLL mode can use more than 2 packets.
+		if (odev->pic_mode != ASUS_OLED_ROLL && packet_num > 2)
+			packet_num = 2;
+
+		send_packets(odev->udev, packet, odev->buf, odev->pic_mode, packet_num);
+	}
+	else
+	if (odev->pack_mode==PACK_MODE_G50){
+		send_packets_g50(odev->udev, packet, odev->buf);
+	}
+
+	kfree(packet);
+}
+
+static int append_values(struct asus_oled_dev *odev, uint8_t val, size_t count)
+{
+	while (count-- > 0) {
+		if (val) {
+			size_t x = odev->buf_offs % odev->width;
+			size_t y = odev->buf_offs / odev->width;
+			size_t i;
+
+			x += odev->x_shift;
+			y += odev->y_shift;
+
+			switch(odev->pack_mode)
+			{
+				case PACK_MODE_G1:
+					// i = (x/128)*640 + 127 - x + (y/8)*128;
+					// This one for 128 is the same, but might be better for different widths?
+					i = (x/odev->dev_width)*640 + odev->dev_width - 1 - x + (y/8)*odev->dev_width;
+				break;
+
+				case PACK_MODE_G50:
+					i =  (odev->dev_width - 1 - x)/8 + y*odev->dev_width/8;
+				break;
+
+				default:
+					i = 0;
+					printk(ASUS_OLED_ERROR "Unknown OLED Pack Mode: %d!\n", odev->pack_mode);
+				break;
+			}
+
+			if (i >= odev->buf_size) {
+				printk(ASUS_OLED_ERROR "Buffer overflow! Report a bug in the driver: offs: %d >= %d i: %d (x: %d y: %d)\n",
+					(int) odev->buf_offs, (int) odev->buf_size, (int) i, (int) x, (int) y);
+				return -EIO;
+			}
+
+			switch (odev->pack_mode)
+			{
+				case PACK_MODE_G1:
+					odev->buf[i] &= ~(1<<(y%8));
+				break;
+
+				case PACK_MODE_G50:
+					odev->buf[i] &= ~(1<<(x%8));
+				break;
+
+				default:
+					// cannot get here; stops gcc complaining
+				;
+			}
+		}
+
+		odev->last_val = val;
+		odev->buf_offs++;
+	}
+
+	return 0;
+}
+
+static ssize_t odev_set_picture(struct asus_oled_dev *odev, const char *buf, size_t count)
+{
+	size_t offs = 0, max_offs;
+
+	if (count < 1) return 0;
+
+	if (tolower(buf[0]) == 'b'){
+	    // binary mode, set the entire memory
+
+	    size_t i;
+
+	    odev->buf_size = (odev->dev_width * ASUS_OLED_DISP_HEIGHT) / 8;
+
+	    if (odev->buf) kfree(odev->buf);
+	    odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
+
+	    memset(odev->buf, 0xff, odev->buf_size);
+
+	    for (i=1; i < count && i<=32*32; i++){
+		odev->buf[i-1] = buf[i];
+		odev->buf_offs = i-1;
+	    }
+
+	    odev->width=odev->dev_width / 8;
+	    odev->height=ASUS_OLED_DISP_HEIGHT;
+	    odev->x_shift=0;
+	    odev->y_shift=0;
+	    odev->last_val=0;
+
+	    send_data(odev);
+
+	    return count;
+	}
+
+	if (buf[0] == '<') {
+		size_t i;
+		size_t w = 0, h = 0;
+		size_t w_mem, h_mem;
+
+		if (count < 10 || buf[2] != ':') {
+			goto error_header;
+		}
+
+		switch(tolower(buf[1])) {
+			case ASUS_OLED_STATIC:
+			case ASUS_OLED_ROLL:
+			case ASUS_OLED_FLASH:
+				odev->pic_mode = buf[1];
+				break;
+			default:
+				printk(ASUS_OLED_ERROR "Wrong picture mode: '%c'.\n", buf[1]);
+				return -EIO;
+				break;
+		}
+
+		for (i = 3; i < count; ++i) {
+			if (buf[i] >= '0' && buf[i] <= '9') {
+				w = 10*w + (buf[i] - '0');
+
+				if (w > ASUS_OLED_MAX_WIDTH) goto error_width;
+			}
+			else if (tolower(buf[i]) == 'x') break;
+			else goto error_width;
+		}
+
+		for (++i; i < count; ++i) {
+			if (buf[i] >= '0' && buf[i] <= '9') {
+				h = 10*h + (buf[i] - '0');
+
+				if (h > ASUS_OLED_DISP_HEIGHT) goto error_height;
+			}
+			else if (tolower(buf[i]) == '>') break;
+			else goto error_height;
+		}
+
+		if (w < 1 || w > ASUS_OLED_MAX_WIDTH) goto error_width;
+
+		if (h < 1 || h > ASUS_OLED_DISP_HEIGHT) goto error_height;
+
+		if (i >= count || buf[i] != '>') goto error_header;
+
+		offs = i+1;
+
+		if (w % (odev->dev_width) != 0)
+			w_mem = (w/(odev->dev_width) + 1)*(odev->dev_width);
+		else
+			w_mem = w;
+
+		if (h < ASUS_OLED_DISP_HEIGHT)
+			h_mem = ASUS_OLED_DISP_HEIGHT;
+		else
+			h_mem = h;
+
+		odev->buf_size = w_mem * h_mem / 8;
+
+		if (odev->buf) kfree(odev->buf);
+		odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
+
+		if (odev->buf == NULL) {
+			odev->buf_size = 0;
+			printk(ASUS_OLED_ERROR "Out of memory!\n");
+			return -ENOMEM;
+		}
+
+		memset(odev->buf, 0xff, odev->buf_size);
+
+		odev->buf_offs = 0;
+		odev->width = w;
+		odev->height = h;
+		odev->x_shift = 0;
+		odev->y_shift = 0;
+		odev->last_val = 0;
+
+		if (odev->pic_mode == ASUS_OLED_FLASH) {
+			if (h < ASUS_OLED_DISP_HEIGHT/2)
+				odev->y_shift = (ASUS_OLED_DISP_HEIGHT/2 - h)/2;
+		}
+		else {
+			if (h < ASUS_OLED_DISP_HEIGHT)
+				odev->y_shift = (ASUS_OLED_DISP_HEIGHT - h)/2;
+		}
+
+		if (w < (odev->dev_width))
+			odev->x_shift = ((odev->dev_width) - w)/2;
+	}
+
+	max_offs = odev->width * odev->height;
+
+	while (offs < count && odev->buf_offs < max_offs) {
+		int ret;
+
+		if (buf[offs] == '1' || buf[offs] == '#') {
+			if ( (ret = append_values(odev, 1, 1)) < 0) return ret;
+		}
+		else if (buf[offs] == '0' || buf[offs] == ' ') {
+			if ( (ret = append_values(odev, 0, 1)) < 0) return ret;
+		}
+		else if (buf[offs] == '\n') {
+			// New line detected. Lets assume, that all characters till the end of the
+			// line were equal to the last character in this line.
+			if (odev->buf_offs % odev->width != 0)
+				if ( (ret = append_values(odev, odev->last_val,
+				      odev->width - (odev->buf_offs % odev->width))) < 0) return ret;
+		}
+
+		offs++;
+	}
+
+	if (odev->buf_offs >= max_offs) send_data(odev);
+
+	return count;
+
+error_width:
+	printk(ASUS_OLED_ERROR "Wrong picture width specified.\n");
+	return -EIO;
+
+error_height:
+	printk(ASUS_OLED_ERROR "Wrong picture height specified.\n");
+	return -EIO;
+
+error_header:
+	printk(ASUS_OLED_ERROR "Wrong picture header.\n");
+	return -EIO;
+}
+
+static ssize_t set_picture(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct usb_interface *intf = to_usb_interface(dev);
+
+	return odev_set_picture(usb_get_intfdata(intf), buf, count);
+}
+
+static ssize_t class_set_picture(struct device *device, struct device_attribute *attr, const char *buf, size_t count)
+{
+	return odev_set_picture((struct asus_oled_dev *) dev_get_drvdata(device), buf, count);
+}
+
+#define ASUS_OLED_DEVICE_ATTR(_file)		dev_attr_asus_oled_##_file
+
+static DEVICE_ATTR(asus_oled_enabled, S_IWUGO | S_IRUGO, get_enabled, set_enabled);
+static DEVICE_ATTR(asus_oled_picture, S_IWUGO , NULL, set_picture);
+
+static DEVICE_ATTR(enabled, S_IWUGO | S_IRUGO, class_get_enabled, class_set_enabled);
+static DEVICE_ATTR(picture, S_IWUGO, NULL, class_set_picture);
+
+static int asus_oled_probe(struct usb_interface *interface, const struct usb_device_id *id)
+{
+	struct usb_device *udev = interface_to_usbdev(interface);
+	struct asus_oled_dev *odev = NULL;
+	int retval = -ENOMEM;
+	uint16_t dev_width = 0;
+	oled_pack_mode_t pack_mode = PACK_MODE_LAST;
+	const struct oled_dev_desc_str * dev_desc = oled_dev_desc_table;
+	const char *desc = 0;
+
+	if (id == 0) {
+		// Even possible? Just to make sure...
+		dev_err(&interface->dev, "No usb_device_id provided!\n");
+		return -ENODEV;
+	}
+
+	for (; dev_desc->idVendor; dev_desc++)
+	{
+		if (dev_desc->idVendor == id->idVendor
+			&& dev_desc->idProduct == id->idProduct)
+		{
+			dev_width = dev_desc->devWidth;
+			desc = dev_desc->devDesc;
+			pack_mode = dev_desc->packMode;
+			break;
+		}
+	}
+
+	if ( !desc || dev_width < 1 || pack_mode == PACK_MODE_LAST) {
+		dev_err(&interface->dev, "Missing or incomplete device description!\n");
+		return -ENODEV;
+	}
+
+	odev = kzalloc(sizeof(struct asus_oled_dev), GFP_KERNEL);
+
+	if (odev == NULL) {
+		dev_err(&interface->dev, "Out of memory\n");
+		return -ENOMEM;
+	}
+
+	odev->udev = usb_get_dev(udev);
+	odev->pic_mode = ASUS_OLED_STATIC;
+	odev->dev_width = dev_width;
+	odev->pack_mode = pack_mode;
+	odev->height = 0;
+	odev->width = 0;
+	odev->x_shift = 0;
+	odev->y_shift = 0;
+	odev->buf_offs = 0;
+	odev->buf_size = 0;
+	odev->last_val = 0;
+	odev->buf = NULL;
+	odev->enabled = 1;
+	odev->dev = 0;
+
+	usb_set_intfdata (interface, odev);
+
+	if ((retval = device_create_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled)))) {
+		goto err_files;
+	}
+
+	if ((retval = device_create_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture)))) {
+		goto err_files;
+	}
+
+	odev->dev = device_create(oled_class, &interface->dev, MKDEV(0,0),
+				NULL,"oled_%d", ++oled_num);
+
+	if (IS_ERR(odev->dev)) {
+		retval = PTR_ERR(odev->dev);
+		goto err_files;
+	}
+
+	dev_set_drvdata(odev->dev, odev);
+
+	if ( (retval = device_create_file(odev->dev, &dev_attr_enabled))) {
+		goto err_class_enabled;
+	}
+
+	if ( (retval = device_create_file(odev->dev, &dev_attr_picture))) {
+		goto err_class_picture;
+	}
+
+	dev_info(&interface->dev, "Attached Asus OLED device: %s [width %u, pack_mode %d]\n", desc, odev->dev_width, odev->pack_mode);
+
+	if (start_off)
+		enable_oled(odev, 0);
+
+	return 0;
+
+err_class_picture:
+	device_remove_file(odev->dev, &dev_attr_picture);
+
+err_class_enabled:
+	device_remove_file(odev->dev, &dev_attr_enabled);
+	device_unregister(odev->dev);
+
+err_files:
+	device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled));
+	device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
+
+	usb_set_intfdata (interface, NULL);
+	usb_put_dev(odev->udev);
+	kfree(odev);
+
+	return retval;
+}
+
+static void asus_oled_disconnect(struct usb_interface *interface)
+{
+	struct asus_oled_dev *odev;
+
+	odev = usb_get_intfdata (interface);
+	usb_set_intfdata (interface, NULL);
+
+	device_remove_file(odev->dev, &dev_attr_picture);
+	device_remove_file(odev->dev, &dev_attr_enabled);
+	device_unregister(odev->dev);
+
+	device_remove_file(&interface->dev, & ASUS_OLED_DEVICE_ATTR(picture));
+	device_remove_file(&interface->dev, & ASUS_OLED_DEVICE_ATTR(enabled));
+
+	usb_put_dev(odev->udev);
+
+	if (odev->buf) kfree(odev->buf);
+
+	kfree(odev);
+
+	dev_info(&interface->dev, "Disconnected Asus OLED device\n");
+}
+
+static struct usb_driver oled_driver = {
+	.name =		ASUS_OLED_NAME,
+	.probe =	asus_oled_probe,
+	.disconnect =	asus_oled_disconnect,
+	.id_table =	id_table,
+};
+
+static ssize_t version_show(struct class *dev, char *buf)
+{
+	return sprintf(buf, ASUS_OLED_UNDERSCORE_NAME " %s\n", ASUS_OLED_VERSION);
+}
+
+static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
+
+static int __init asus_oled_init(void)
+{
+	int retval = 0;
+	oled_class = class_create(THIS_MODULE, ASUS_OLED_UNDERSCORE_NAME);
+
+	if (IS_ERR(oled_class)) {
+		err("Error creating " ASUS_OLED_UNDERSCORE_NAME " class");
+		return PTR_ERR(oled_class);
+	}
+
+	if ((retval = class_create_file(oled_class, &class_attr_version))) {
+		err("Error creating class version file");
+		goto error;
+	}
+
+	retval = usb_register(&oled_driver);
+
+	if (retval) {
+		err("usb_register failed. Error number %d", retval);
+		goto error;
+	}
+
+	return retval;
+
+error:
+	class_destroy(oled_class);
+	return retval;
+}
+
+static void __exit asus_oled_exit(void)
+{
+	class_remove_file(oled_class, &class_attr_version);
+	class_destroy(oled_class);
+
+	usb_deregister(&oled_driver);
+}
+
+module_init (asus_oled_init);
+module_exit (asus_oled_exit);
+

drivers/staging/asus_oled/linux.txt

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drivers/staging/asus_oled/linux_f.txt

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drivers/staging/asus_oled/linux_fr.txt

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drivers/staging/asus_oled/tux.txt

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drivers/staging/asus_oled/tux_r.txt

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drivers/staging/asus_oled/tux_r2.txt

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drivers/staging/asus_oled/zig.txt

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