[PATCH 2.6.19-rc1 update4] drivers: add LCD support
From: Miguel Ojeda Sandonis
Date: Fri Oct 27 2006 - 09:36:02 EST
Andrew, here it is the same patch without locking. Thanks you.
---
- Adds mmaping support for the cfag12864bfb.
- Exchange the wiring drawing URL to a local ASCII drawing
at Documentation/auxdisplay/cfag12864b.
- Minor coding style and documentation fixes.
Documentation/auxdisplay/cfag12864b | 57 +++++++++++++++++++-------
Documentation/auxdisplay/ks0108 | 14 ++----
drivers/auxdisplay/Kconfig | 7 ---
drivers/auxdisplay/cfag12864b.c | 28 +++++++-----
drivers/auxdisplay/cfag12864bfb.c | 30 ++++++++++++-
5 files changed, 93 insertions(+), 43 deletions(-)
miguelojeda-2.6.19-rc1-drivers-add-LCD-support-4-mmaping-and-ascii-drawing.patch
Signed-off-by: Miguel Ojeda Sandonis <maxextreme@xxxxxxxxx>
---
diff -uprN -X dontdiff linux-2.6.19-rc1-modified/Documentation/auxdisplay/cfag12864b linux/Documentation/auxdisplay/cfag12864b
--- linux-2.6.19-rc1-modified/Documentation/auxdisplay/cfag12864b 2006-10-26 16:57:38.000000000 +0000
+++ linux/Documentation/auxdisplay/cfag12864b 2006-10-27 15:33:01.000000000 +0000
@@ -4,7 +4,7 @@
License: GPLv2
Author & Maintainer: Miguel Ojeda Sandonis <maxextreme@xxxxxxxxx>
-Date: 2006-10-11
+Date: 2006-10-27
@@ -15,7 +15,7 @@ Date: 2006-10-11
1. DRIVER INFORMATION
2. DEVICE INFORMATION
3. WIRING
- 4. USER-SPACE PROGRAMMING
+ 4. USERSPACE PROGRAMMING
---------------------
@@ -42,7 +42,8 @@ Controller: ks0108
Controllers: 2
Pages: 8 each controller
Addresses: 64 each page
-
+Data size: 1 byte each address
+Memory size: 2 * 8 * 64 * 1 = 1024 bytes = 1 Kbyte
---------
@@ -51,25 +52,53 @@ Addresses: 64 each page
The cfag12864b LCD Series don't have official wiring.
-The common wiring is done to the parallel port:
-
-http://www.skippari.net/lcd/sekalaista/crystalfontz_cfag12864B-TMI-V.png
-
-You can get help at Crystalfontz and LCDInfo forums.
+The common wiring is done to the parallel port as shown:
+Parallel Port cfag12864b
+
+ Name Pin# Pin# Name
+
+Strobe ( 1)------------------------------(17) Enable
+Data 0 ( 2)------------------------------( 4) Data 0
+Data 1 ( 3)------------------------------( 5) Data 1
+Data 2 ( 4)------------------------------( 6) Data 2
+Data 3 ( 5)------------------------------( 7) Data 3
+Data 4 ( 6)------------------------------( 8) Data 4
+Data 5 ( 7)------------------------------( 9) Data 5
+Data 6 ( 8)------------------------------(10) Data 6
+Data 7 ( 9)------------------------------(11) Data 7
+ (10) [+5v]---( 1) Vdd
+ (11) [GND]---( 2) Ground
+ (12) [+5v]---(14) Reset
+ (13) [GND]---(15) Read / Write
+ Line (14)------------------------------(13) Controller Select 1
+ (15)
+ Init (16)------------------------------(12) Controller Select 2
+Select (17)------------------------------(16) Data / Instruction
+Ground (18)---[GND] [+5v]---(19) LED +
+Ground (19)---[GND]
+Ground (20)---[GND] E A Values:
+Ground (21)---[GND] [GND]---[P1]---(18) Vee · R = Resistor = 22 ohm
+Ground (22)---[GND] | · P1 = Preset = 10 Kohm
+Ground (23)---[GND] ---- S ------( 3) V0 · P2 = Preset = 1 Kohm
+Ground (24)---[GND] | |
+Ground (25)---[GND] [GND]---[P2]---[R]---(20) LED -
------------------------
4. USERSPACE PROGRAMMING
------------------------
-The cfag12864bfb describes a framebuffer driver (/dev/fbX).
+The cfag12864bfb describes a framebuffer device (/dev/fbX).
-It has a size of 128 * 64 / 8 = 1024 bytes = 1 kB.
+It has a size of 1024 bytes = 1 Kbyte.
Each bit represents one pixel. If the bit is high, the pixel will
turn on. If the pixel is low, the pixel will turn off.
-You can mmap the framebuffer as usual.
+You can use the framebuffer as a file: fopen, fwrite, fclose...
+
+Also, you can mmap the framebuffer: open & mmap, munmap & close...
+which is the best option.
You can use a copy of this header in your userspace programs.
@@ -79,7 +108,7 @@ You can use a copy of this header in you
* Description: cfag12864b LCD Display Driver Header for user-space apps
*
* Author: Miguel Ojeda Sandonis <maxextreme@xxxxxxxxx>
- * Date: 2006-10-11
+ * Date: 2006-10-27
*/
#ifndef _CFAG12864B_H_
@@ -87,9 +116,7 @@ You can use a copy of this header in you
#define CFAG12864B_WIDTH (128)
#define CFAG12864B_HEIGHT (64)
-#define CFAG12864B_SIZE ((CFAG12864B_CONTROLLERS) * \
- (CFAG12864B_PAGES) * \
- (CFAG12864B_ADDRESSES))
+#define CFAG12864B_SIZE (1024)
#endif // _CFAG12864B_H_
---8<---
diff -uprN -X dontdiff linux-2.6.19-rc1-modified/Documentation/auxdisplay/ks0108 linux/Documentation/auxdisplay/ks0108
--- linux-2.6.19-rc1-modified/Documentation/auxdisplay/ks0108 2006-10-26 16:57:38.000000000 +0000
+++ linux/Documentation/auxdisplay/ks0108 2006-10-27 15:32:48.000000000 +0000
@@ -4,7 +4,7 @@
License: GPLv2
Author & Maintainer: Miguel Ojeda Sandonis <maxextreme@xxxxxxxxx>
-Date: 2006-10-04
+Date: 2006-10-27
@@ -39,7 +39,8 @@ Height: 64
Colors: 2 (B/N)
Pages: 8
Addresses: 64 each page
-
+Data size: 1 byte each address
+Memory size: 8 * 64 * 1 = 512 bytes
---------
@@ -48,12 +49,9 @@ Addresses: 64 each page
The driver supports data parallel port wiring.
-If you aren't creating a LCD related hardware, you should check
-your LCD specific wiring information in the same folder, not this one.
-
-
-Wiring example of a cfag12864b LCD which has two ks0108 controllers:
+If you aren't building LCD related hardware, you should check
+your LCD specific wiring information in the same folder.
-http://www.skippari.net/lcd/sekalaista/crystalfontz_cfag12864B-TMI-V.png
+For example, check Documentation/auxdisplay/cfag12864b.
EOF
diff -uprN -X dontdiff linux-2.6.19-rc1-modified/drivers/auxdisplay/cfag12864b.c linux/drivers/auxdisplay/cfag12864b.c
--- linux-2.6.19-rc1-modified/drivers/auxdisplay/cfag12864b.c 2006-10-26 16:57:38.000000000 +0000
+++ linux/drivers/auxdisplay/cfag12864b.c 2006-10-27 15:23:04.000000000 +0000
@@ -6,7 +6,7 @@
* Depends: ks0108
*
* Author: Copyright (C) Miguel Ojeda Sandonis <maxextreme@xxxxxxxxx>
- * Date: 2006-10-13
+ * Date: 2006-10-26
*
* 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
@@ -182,7 +182,7 @@ static void cfag12864b_nop(void)
* cfag12864b Internal Commands
*/
-unsigned char *cfag12864b_cache;
+static unsigned char *cfag12864b_cache;
unsigned char *cfag12864b_buffer;
EXPORT_SYMBOL_GPL(cfag12864b_buffer);
@@ -226,7 +226,7 @@ static void cfag12864b_update(void *arg)
unsigned char c;
unsigned short i, j, k, b;
- if(memcmp(cfag12864b_cache, cfag12864b_buffer, CFAG12864B_SIZE)) {
+ if (memcmp(cfag12864b_cache, cfag12864b_buffer, CFAG12864B_SIZE)) {
for (i = 0; i < CFAG12864B_CONTROLLERS; i++) {
cfag12864b_controller(i);
cfag12864b_nop();
@@ -251,7 +251,7 @@ static void cfag12864b_update(void *arg)
memcpy(cfag12864b_cache, cfag12864b_buffer, CFAG12864B_SIZE);
}
- if(cfag12864b_updating)
+ if (cfag12864b_updating)
queue_delayed_work(cfag12864b_workqueue, &cfag12864b_work,
HZ / cfag12864b_rate);
}
@@ -264,12 +264,18 @@ static int __init cfag12864b_init(void)
{
int ret = -EINVAL;
- cfag12864b_buffer = vmalloc(sizeof(unsigned char) *
- CFAG12864B_SIZE);
+ if (PAGE_SIZE < CFAG12864B_SIZE) {
+ printk(KERN_ERR CFAG12864B_NAME ": ERROR: "
+ "page size (%i) < cfag12864b size (%i)\n",
+ (unsigned int)PAGE_SIZE, CFAG12864B_SIZE);
+ ret = -ENOMEM;
+ goto none;
+ }
+
+ cfag12864b_buffer = (unsigned char *) __get_free_page(GFP_KERNEL);
if (cfag12864b_buffer == NULL) {
printk(KERN_ERR CFAG12864B_NAME ": ERROR: "
- "can't v-alloc buffer (%i bytes)\n",
- CFAG12864B_SIZE);
+ "can't get a free page\n");
ret = -ENOMEM;
goto none;
}
@@ -290,7 +296,7 @@ static int __init cfag12864b_init(void)
cfag12864b_on();
cfag12864b_workqueue = create_singlethread_workqueue(CFAG12864B_NAME);
- if(cfag12864b_workqueue == NULL)
+ if (cfag12864b_workqueue == NULL)
goto cachealloced;
cfag12864b_updating = 1;
@@ -302,7 +308,7 @@ cachealloced:
kfree(cfag12864b_cache);
bufferalloced:
- vfree(cfag12864b_buffer);
+ free_page((unsigned long) cfag12864b_buffer);
none:
return ret;
@@ -317,7 +323,7 @@ static void __exit cfag12864b_exit(void)
cfag12864b_off();
kfree(cfag12864b_cache);
- vfree(cfag12864b_buffer);
+ free_page((unsigned long) cfag12864b_buffer);
}
module_init(cfag12864b_init);
diff -uprN -X dontdiff linux-2.6.19-rc1-modified/drivers/auxdisplay/cfag12864bfb.c linux/drivers/auxdisplay/cfag12864bfb.c
--- linux-2.6.19-rc1-modified/drivers/auxdisplay/cfag12864bfb.c 2006-10-26 16:57:38.000000000 +0000
+++ linux/drivers/auxdisplay/cfag12864bfb.c 2006-10-27 15:23:12.000000000 +0000
@@ -6,7 +6,7 @@
* Depends: cfag12864b
*
* Author: Copyright (C) Miguel Ojeda Sandonis <maxextreme@xxxxxxxxx>
- * Date: 2006-10-13
+ * Date: 2006-10-26
*
* 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
@@ -40,7 +40,7 @@
#define CFAG12864BFB_NAME "cfag12864bfb"
static struct fb_fix_screeninfo cfag12864bfb_fix __initdata = {
- .id = "cfag12864b",
+ .id = "cfag12864b",
.type = FB_TYPE_PACKED_PIXELS,
.visual = FB_VISUAL_MONO10,
.xpanstep = 0,
@@ -66,11 +66,35 @@ static struct fb_var_screeninfo cfag1286
.vmode = FB_VMODE_NONINTERLACED,
};
+static struct page *cfag12864bfb_vma_nopage(struct vm_area_struct *vma,
+ unsigned long address, int *type)
+{
+ struct page *page = virt_to_page(cfag12864b_buffer);
+ get_page(page);
+
+ if(type)
+ *type = VM_FAULT_MINOR;
+
+ return page;
+}
+
+static struct vm_operations_struct cfag12864bfb_vm_ops = {
+ .nopage = cfag12864bfb_vma_nopage,
+};
+
+static int cfag12864bfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
+{
+ vma->vm_ops = &cfag12864bfb_vm_ops;
+ vma->vm_flags |= VM_RESERVED;
+ return 0;
+}
+
static struct fb_ops cfag12864bfb_ops = {
.owner = THIS_MODULE,
.fb_fillrect = cfb_fillrect,
.fb_copyarea = cfb_copyarea,
.fb_imageblit = cfb_imageblit,
+ .fb_mmap = cfag12864bfb_mmap,
};
static int __init cfag12864bfb_probe(struct platform_device *device)
@@ -81,7 +105,7 @@ static int __init cfag12864bfb_probe(str
if (!info)
goto none;
- info->screen_base = (char __iomem *)cfag12864b_buffer;
+ info->screen_base = (char __iomem *) cfag12864b_buffer;
info->screen_size = CFAG12864B_SIZE;
info->fbops = &cfag12864bfb_ops;
info->fix = cfag12864bfb_fix;
diff -uprN -X dontdiff linux-2.6.19-rc1-modified/drivers/auxdisplay/Kconfig linux/drivers/auxdisplay/Kconfig
--- linux-2.6.19-rc1-modified/drivers/auxdisplay/Kconfig 2006-10-26 17:01:26.000000000 +0000
+++ linux/drivers/auxdisplay/Kconfig 2006-10-26 17:39:57.000000000 +0000
@@ -71,12 +71,7 @@ config CFAG12864B
say Y. You also need the ks0108 LCD Controller driver.
For help about how to wire your LCD to the parallel port,
- check this image:
-
- http://www.skippari.net/lcd/sekalaista/crystalfontz_cfag12864B-TMI-V.png
-
- Also, you can find help in Crystalfontz and LCDStudio forums.
- Check Documentation/lcddisplay/cfag12864b for more information.
+ check Documentation/auxdisplay/cfag12864b
The LCD framebuffer driver can be attached to a console.
It will work fine. However, you can't attach it to the fbdev driver
-
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