2005-04-17 00:20:36 +02:00
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/*
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* LCD Lowlevel Control Abstraction
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*
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* Copyright (C) 2003,2004 Hewlett-Packard Company
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*
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*/
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2012-05-30 00:07:16 +02:00
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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2005-04-17 00:20:36 +02:00
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/lcd.h>
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#include <linux/notifier.h>
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#include <linux/ctype.h>
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#include <linux/err.h>
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#include <linux/fb.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 09:04:11 +01:00
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#include <linux/slab.h>
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2005-04-17 00:20:36 +02:00
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2006-12-08 11:40:47 +01:00
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#if defined(CONFIG_FB) || (defined(CONFIG_FB_MODULE) && \
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defined(CONFIG_LCD_CLASS_DEVICE_MODULE))
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/* This callback gets called when something important happens inside a
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* framebuffer driver. We're looking if that important event is blanking,
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* and if it is, we're switching lcd power as well ...
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*/
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static int fb_notifier_callback(struct notifier_block *self,
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unsigned long event, void *data)
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{
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struct lcd_device *ld;
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struct fb_event *evdata = data;
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/* If we aren't interested in this event, skip it immediately ... */
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2008-08-28 22:18:43 +02:00
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switch (event) {
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case FB_EVENT_BLANK:
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case FB_EVENT_MODE_CHANGE:
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case FB_EVENT_MODE_CHANGE_ALL:
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2012-05-30 00:07:13 +02:00
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case FB_EARLY_EVENT_BLANK:
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case FB_R_EARLY_EVENT_BLANK:
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2008-08-28 22:18:43 +02:00
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break;
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default:
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2006-12-08 11:40:47 +01:00
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return 0;
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2008-08-28 22:18:43 +02:00
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}
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2006-12-08 11:40:47 +01:00
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ld = container_of(self, struct lcd_device, fb_notif);
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2008-08-28 22:18:43 +02:00
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if (!ld->ops)
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return 0;
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2007-02-11 00:07:48 +01:00
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mutex_lock(&ld->ops_lock);
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2008-08-28 22:18:43 +02:00
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if (!ld->ops->check_fb || ld->ops->check_fb(ld, evdata->info)) {
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2008-11-20 00:36:25 +01:00
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if (event == FB_EVENT_BLANK) {
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if (ld->ops->set_power)
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ld->ops->set_power(ld, *(int *)evdata->data);
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2012-05-30 00:07:13 +02:00
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} else if (event == FB_EARLY_EVENT_BLANK) {
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if (ld->ops->early_set_power)
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ld->ops->early_set_power(ld,
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*(int *)evdata->data);
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} else if (event == FB_R_EARLY_EVENT_BLANK) {
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if (ld->ops->r_early_set_power)
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ld->ops->r_early_set_power(ld,
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*(int *)evdata->data);
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2008-11-20 00:36:25 +01:00
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} else {
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if (ld->ops->set_mode)
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ld->ops->set_mode(ld, evdata->data);
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}
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2008-08-28 22:18:43 +02:00
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}
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2007-02-11 00:07:48 +01:00
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mutex_unlock(&ld->ops_lock);
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2006-12-08 11:40:47 +01:00
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return 0;
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}
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static int lcd_register_fb(struct lcd_device *ld)
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{
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2009-10-02 11:28:18 +02:00
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memset(&ld->fb_notif, 0, sizeof(ld->fb_notif));
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2006-12-08 11:40:47 +01:00
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ld->fb_notif.notifier_call = fb_notifier_callback;
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return fb_register_client(&ld->fb_notif);
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}
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static void lcd_unregister_fb(struct lcd_device *ld)
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{
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fb_unregister_client(&ld->fb_notif);
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}
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#else
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static int lcd_register_fb(struct lcd_device *ld)
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{
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return 0;
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}
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static inline void lcd_unregister_fb(struct lcd_device *ld)
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{
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}
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#endif /* CONFIG_FB */
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2013-07-25 00:05:31 +02:00
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static ssize_t lcd_power_show(struct device *dev, struct device_attribute *attr,
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2007-07-09 13:17:24 +02:00
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char *buf)
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2005-04-17 00:20:36 +02:00
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{
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int rc;
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2007-07-09 13:17:24 +02:00
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struct lcd_device *ld = to_lcd_device(dev);
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2005-04-17 00:20:36 +02:00
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2007-02-11 00:07:48 +01:00
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mutex_lock(&ld->ops_lock);
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if (ld->ops && ld->ops->get_power)
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rc = sprintf(buf, "%d\n", ld->ops->get_power(ld));
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2005-04-17 00:20:36 +02:00
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else
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rc = -ENXIO;
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2007-02-11 00:07:48 +01:00
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mutex_unlock(&ld->ops_lock);
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2005-04-17 00:20:36 +02:00
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return rc;
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}
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2013-07-25 00:05:31 +02:00
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static ssize_t lcd_power_store(struct device *dev,
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2007-07-09 13:17:24 +02:00
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struct device_attribute *attr, const char *buf, size_t count)
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2005-04-17 00:20:36 +02:00
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{
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2012-12-18 01:01:10 +01:00
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int rc;
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2007-07-09 13:17:24 +02:00
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struct lcd_device *ld = to_lcd_device(dev);
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2012-01-11 00:09:19 +01:00
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unsigned long power;
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2005-04-17 00:20:36 +02:00
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2012-01-11 00:09:19 +01:00
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rc = kstrtoul(buf, 0, &power);
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if (rc)
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return rc;
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2005-04-17 00:20:36 +02:00
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2012-12-18 01:01:10 +01:00
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rc = -ENXIO;
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2007-02-11 00:07:48 +01:00
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mutex_lock(&ld->ops_lock);
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if (ld->ops && ld->ops->set_power) {
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2012-05-30 00:07:16 +02:00
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pr_debug("set power to %lu\n", power);
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2007-02-11 00:07:48 +01:00
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ld->ops->set_power(ld, power);
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2005-04-17 00:20:36 +02:00
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rc = count;
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2006-05-15 18:44:15 +02:00
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}
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2007-02-11 00:07:48 +01:00
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mutex_unlock(&ld->ops_lock);
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2005-04-17 00:20:36 +02:00
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return rc;
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}
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2013-07-25 00:05:31 +02:00
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static DEVICE_ATTR_RW(lcd_power);
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2005-04-17 00:20:36 +02:00
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2013-07-25 00:05:31 +02:00
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static ssize_t contrast_show(struct device *dev,
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2007-07-09 13:17:24 +02:00
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struct device_attribute *attr, char *buf)
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2005-04-17 00:20:36 +02:00
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{
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2006-05-15 18:44:15 +02:00
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int rc = -ENXIO;
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2007-07-09 13:17:24 +02:00
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struct lcd_device *ld = to_lcd_device(dev);
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2005-04-17 00:20:36 +02:00
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2007-02-11 00:07:48 +01:00
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mutex_lock(&ld->ops_lock);
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if (ld->ops && ld->ops->get_contrast)
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rc = sprintf(buf, "%d\n", ld->ops->get_contrast(ld));
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mutex_unlock(&ld->ops_lock);
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2005-04-17 00:20:36 +02:00
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return rc;
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}
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2013-07-25 00:05:31 +02:00
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static ssize_t contrast_store(struct device *dev,
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2007-07-09 13:17:24 +02:00
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struct device_attribute *attr, const char *buf, size_t count)
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2005-04-17 00:20:36 +02:00
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{
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2012-12-18 01:01:10 +01:00
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int rc;
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2007-07-09 13:17:24 +02:00
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struct lcd_device *ld = to_lcd_device(dev);
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2012-01-11 00:09:19 +01:00
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unsigned long contrast;
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2005-04-17 00:20:36 +02:00
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2012-01-11 00:09:19 +01:00
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rc = kstrtoul(buf, 0, &contrast);
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if (rc)
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return rc;
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2005-04-17 00:20:36 +02:00
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2012-12-18 01:01:10 +01:00
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rc = -ENXIO;
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2007-02-11 00:07:48 +01:00
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mutex_lock(&ld->ops_lock);
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if (ld->ops && ld->ops->set_contrast) {
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2012-05-30 00:07:16 +02:00
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pr_debug("set contrast to %lu\n", contrast);
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2007-02-11 00:07:48 +01:00
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ld->ops->set_contrast(ld, contrast);
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2005-04-17 00:20:36 +02:00
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rc = count;
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2006-05-15 18:44:15 +02:00
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}
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2007-02-11 00:07:48 +01:00
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mutex_unlock(&ld->ops_lock);
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2005-04-17 00:20:36 +02:00
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return rc;
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}
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2013-07-25 00:05:31 +02:00
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static DEVICE_ATTR_RW(contrast);
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2005-04-17 00:20:36 +02:00
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2013-07-25 00:05:31 +02:00
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static ssize_t max_contrast_show(struct device *dev,
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2007-07-09 13:17:24 +02:00
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struct device_attribute *attr, char *buf)
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2005-04-17 00:20:36 +02:00
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{
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2007-07-09 13:17:24 +02:00
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struct lcd_device *ld = to_lcd_device(dev);
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2005-04-17 00:20:36 +02:00
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2007-02-11 00:07:48 +01:00
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return sprintf(buf, "%d\n", ld->props.max_contrast);
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2005-04-17 00:20:36 +02:00
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}
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2013-07-25 00:05:31 +02:00
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static DEVICE_ATTR_RO(max_contrast);
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2005-04-17 00:20:36 +02:00
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2007-08-11 11:27:19 +02:00
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static struct class *lcd_class;
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2007-07-09 13:17:24 +02:00
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static void lcd_device_release(struct device *dev)
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2005-04-17 00:20:36 +02:00
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{
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struct lcd_device *ld = to_lcd_device(dev);
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kfree(ld);
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}
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2013-07-25 00:05:31 +02:00
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static struct attribute *lcd_device_attrs[] = {
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&dev_attr_lcd_power.attr,
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&dev_attr_contrast.attr,
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&dev_attr_max_contrast.attr,
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NULL,
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2005-04-17 00:20:36 +02:00
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};
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2013-07-25 00:05:31 +02:00
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ATTRIBUTE_GROUPS(lcd_device);
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2005-04-17 00:20:36 +02:00
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/**
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* lcd_device_register - register a new object of lcd_device class.
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* @name: the name of the new object(must be the same as the name of the
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* respective framebuffer device).
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2007-07-09 13:17:24 +02:00
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* @devdata: an optional pointer to be stored in the device. The
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* methods may retrieve it by using lcd_get_data(ld).
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2007-02-11 00:07:48 +01:00
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* @ops: the lcd operations structure.
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2005-04-17 00:20:36 +02:00
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*
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2007-07-09 13:17:24 +02:00
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* Creates and registers a new lcd device. Returns either an ERR_PTR()
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2005-04-17 00:20:36 +02:00
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* or a pointer to the newly allocated device.
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*/
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2007-07-09 13:17:24 +02:00
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struct lcd_device *lcd_device_register(const char *name, struct device *parent,
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void *devdata, struct lcd_ops *ops)
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2005-04-17 00:20:36 +02:00
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{
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struct lcd_device *new_ld;
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2007-07-09 13:17:24 +02:00
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int rc;
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2005-04-17 00:20:36 +02:00
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pr_debug("lcd_device_register: name=%s\n", name);
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2007-02-11 00:07:48 +01:00
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new_ld = kzalloc(sizeof(struct lcd_device), GFP_KERNEL);
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2007-02-08 01:12:28 +01:00
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if (!new_ld)
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2006-03-10 02:33:36 +01:00
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return ERR_PTR(-ENOMEM);
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2005-04-17 00:20:36 +02:00
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2007-02-11 00:07:48 +01:00
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mutex_init(&new_ld->ops_lock);
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2007-02-08 23:25:09 +01:00
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mutex_init(&new_ld->update_lock);
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2005-04-17 00:20:36 +02:00
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2007-07-09 13:17:24 +02:00
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new_ld->dev.class = lcd_class;
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new_ld->dev.parent = parent;
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new_ld->dev.release = lcd_device_release;
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2013-07-04 00:04:56 +02:00
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dev_set_name(&new_ld->dev, "%s", name);
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2007-07-09 13:17:24 +02:00
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dev_set_drvdata(&new_ld->dev, devdata);
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rc = device_register(&new_ld->dev);
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2007-02-08 01:12:28 +01:00
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if (rc) {
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2007-02-07 23:25:50 +01:00
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kfree(new_ld);
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2005-04-17 00:20:36 +02:00
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return ERR_PTR(rc);
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}
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2006-12-08 11:40:47 +01:00
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rc = lcd_register_fb(new_ld);
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2007-02-07 23:25:50 +01:00
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if (rc) {
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2007-07-09 13:17:24 +02:00
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device_unregister(&new_ld->dev);
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2007-02-07 23:25:50 +01:00
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return ERR_PTR(rc);
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}
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2005-04-17 00:20:36 +02:00
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|
|
2007-07-09 13:17:24 +02:00
|
|
|
new_ld->ops = ops;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
return new_ld;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(lcd_device_register);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* lcd_device_unregister - unregisters a object of lcd_device class.
|
|
|
|
* @ld: the lcd device object to be unregistered and freed.
|
|
|
|
*
|
|
|
|
* Unregisters a previously registered via lcd_device_register object.
|
|
|
|
*/
|
|
|
|
void lcd_device_unregister(struct lcd_device *ld)
|
|
|
|
{
|
|
|
|
if (!ld)
|
|
|
|
return;
|
|
|
|
|
2007-02-11 00:07:48 +01:00
|
|
|
mutex_lock(&ld->ops_lock);
|
|
|
|
ld->ops = NULL;
|
|
|
|
mutex_unlock(&ld->ops_lock);
|
2006-12-08 11:40:47 +01:00
|
|
|
lcd_unregister_fb(ld);
|
2007-07-09 13:17:24 +02:00
|
|
|
|
|
|
|
device_unregister(&ld->dev);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(lcd_device_unregister);
|
|
|
|
|
2013-07-04 00:05:14 +02:00
|
|
|
static void devm_lcd_device_release(struct device *dev, void *res)
|
|
|
|
{
|
|
|
|
struct lcd_device *lcd = *(struct lcd_device **)res;
|
|
|
|
|
|
|
|
lcd_device_unregister(lcd);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int devm_lcd_device_match(struct device *dev, void *res, void *data)
|
|
|
|
{
|
|
|
|
struct lcd_device **r = res;
|
|
|
|
|
|
|
|
return *r == data;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* devm_lcd_device_register - resource managed lcd_device_register()
|
|
|
|
* @dev: the device to register
|
|
|
|
* @name: the name of the device
|
|
|
|
* @parent: a pointer to the parent device
|
|
|
|
* @devdata: an optional pointer to be stored for private driver use
|
|
|
|
* @ops: the lcd operations structure
|
|
|
|
*
|
|
|
|
* @return a struct lcd on success, or an ERR_PTR on error
|
|
|
|
*
|
|
|
|
* Managed lcd_device_register(). The lcd_device returned from this function
|
|
|
|
* are automatically freed on driver detach. See lcd_device_register()
|
|
|
|
* for more information.
|
|
|
|
*/
|
|
|
|
struct lcd_device *devm_lcd_device_register(struct device *dev,
|
|
|
|
const char *name, struct device *parent,
|
|
|
|
void *devdata, struct lcd_ops *ops)
|
|
|
|
{
|
|
|
|
struct lcd_device **ptr, *lcd;
|
|
|
|
|
|
|
|
ptr = devres_alloc(devm_lcd_device_release, sizeof(*ptr), GFP_KERNEL);
|
|
|
|
if (!ptr)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
|
|
|
|
lcd = lcd_device_register(name, parent, devdata, ops);
|
|
|
|
if (!IS_ERR(lcd)) {
|
|
|
|
*ptr = lcd;
|
|
|
|
devres_add(dev, ptr);
|
|
|
|
} else {
|
|
|
|
devres_free(ptr);
|
|
|
|
}
|
|
|
|
|
|
|
|
return lcd;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(devm_lcd_device_register);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* devm_lcd_device_unregister - resource managed lcd_device_unregister()
|
|
|
|
* @dev: the device to unregister
|
|
|
|
* @ld: the lcd device to unregister
|
|
|
|
*
|
|
|
|
* Deallocated a lcd allocated with devm_lcd_device_register(). Normally
|
|
|
|
* this function will not need to be called and the resource management
|
|
|
|
* code will ensure that the resource is freed.
|
|
|
|
*/
|
|
|
|
void devm_lcd_device_unregister(struct device *dev, struct lcd_device *ld)
|
|
|
|
{
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
rc = devres_release(dev, devm_lcd_device_release,
|
|
|
|
devm_lcd_device_match, ld);
|
|
|
|
WARN_ON(rc);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(devm_lcd_device_unregister);
|
|
|
|
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
static void __exit lcd_class_exit(void)
|
|
|
|
{
|
2007-07-09 13:17:24 +02:00
|
|
|
class_destroy(lcd_class);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static int __init lcd_class_init(void)
|
|
|
|
{
|
2007-07-09 13:17:24 +02:00
|
|
|
lcd_class = class_create(THIS_MODULE, "lcd");
|
|
|
|
if (IS_ERR(lcd_class)) {
|
2012-05-30 00:07:16 +02:00
|
|
|
pr_warn("Unable to create backlight class; errno = %ld\n",
|
|
|
|
PTR_ERR(lcd_class));
|
2007-07-09 13:17:24 +02:00
|
|
|
return PTR_ERR(lcd_class);
|
|
|
|
}
|
|
|
|
|
2013-07-25 00:05:31 +02:00
|
|
|
lcd_class->dev_groups = lcd_device_groups;
|
2007-07-09 13:17:24 +02:00
|
|
|
return 0;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* if this is compiled into the kernel, we need to ensure that the
|
|
|
|
* class is registered before users of the class try to register lcd's
|
|
|
|
*/
|
|
|
|
postcore_initcall(lcd_class_init);
|
|
|
|
module_exit(lcd_class_exit);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_AUTHOR("Jamey Hicks <jamey.hicks@hp.com>, Andrew Zabolotny <zap@homelink.ru>");
|
|
|
|
MODULE_DESCRIPTION("LCD Lowlevel Control Abstraction");
|