linux/drivers/input/touchscreen/w90p910_ts.c
Tejun Heo 5a0e3ad6af 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  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>
2010-03-30 22:02:32 +09:00

352 lines
8.6 KiB
C

/*
* Copyright (c) 2008 Nuvoton technology corporation.
*
* Wan ZongShun <mcuos.com@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;version 2 of the License.
*
*/
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
/* ADC controller bit defines */
#define ADC_DELAY 0xf00
#define ADC_DOWN 0x01
#define ADC_TSC_Y (0x01 << 8)
#define ADC_TSC_X (0x00 << 8)
#define TSC_FOURWIRE (~(0x03 << 1))
#define ADC_CLK_EN (0x01 << 28) /* ADC clock enable */
#define ADC_READ_CON (0x01 << 12)
#define ADC_CONV (0x01 << 13)
#define ADC_SEMIAUTO (0x01 << 14)
#define ADC_WAITTRIG (0x03 << 14)
#define ADC_RST1 (0x01 << 16)
#define ADC_RST0 (0x00 << 16)
#define ADC_EN (0x01 << 17)
#define ADC_INT (0x01 << 18)
#define WT_INT (0x01 << 20)
#define ADC_INT_EN (0x01 << 21)
#define LVD_INT_EN (0x01 << 22)
#define WT_INT_EN (0x01 << 23)
#define ADC_DIV (0x04 << 1) /* div = 6 */
enum ts_state {
TS_WAIT_NEW_PACKET, /* We are waiting next touch report */
TS_WAIT_X_COORD, /* We are waiting for ADC to report X coord */
TS_WAIT_Y_COORD, /* We are waiting for ADC to report Y coord */
TS_IDLE, /* Input device is closed, don't do anything */
};
struct w90p910_ts {
struct input_dev *input;
struct timer_list timer;
struct clk *clk;
int irq_num;
void __iomem *ts_reg;
spinlock_t lock;
enum ts_state state;
};
static void w90p910_report_event(struct w90p910_ts *w90p910_ts, bool down)
{
struct input_dev *dev = w90p910_ts->input;
if (down) {
input_report_abs(dev, ABS_X,
__raw_readl(w90p910_ts->ts_reg + 0x0c));
input_report_abs(dev, ABS_Y,
__raw_readl(w90p910_ts->ts_reg + 0x10));
}
input_report_key(dev, BTN_TOUCH, down);
input_sync(dev);
}
static void w90p910_prepare_x_reading(struct w90p910_ts *w90p910_ts)
{
unsigned long ctlreg;
__raw_writel(ADC_TSC_X, w90p910_ts->ts_reg + 0x04);
ctlreg = __raw_readl(w90p910_ts->ts_reg);
ctlreg &= ~(ADC_WAITTRIG | WT_INT | WT_INT_EN);
ctlreg |= ADC_SEMIAUTO | ADC_INT_EN | ADC_CONV;
__raw_writel(ctlreg, w90p910_ts->ts_reg);
w90p910_ts->state = TS_WAIT_X_COORD;
}
static void w90p910_prepare_y_reading(struct w90p910_ts *w90p910_ts)
{
unsigned long ctlreg;
__raw_writel(ADC_TSC_Y, w90p910_ts->ts_reg + 0x04);
ctlreg = __raw_readl(w90p910_ts->ts_reg);
ctlreg &= ~(ADC_WAITTRIG | ADC_INT | WT_INT_EN);
ctlreg |= ADC_SEMIAUTO | ADC_INT_EN | ADC_CONV;
__raw_writel(ctlreg, w90p910_ts->ts_reg);
w90p910_ts->state = TS_WAIT_Y_COORD;
}
static void w90p910_prepare_next_packet(struct w90p910_ts *w90p910_ts)
{
unsigned long ctlreg;
ctlreg = __raw_readl(w90p910_ts->ts_reg);
ctlreg &= ~(ADC_INT | ADC_INT_EN | ADC_SEMIAUTO | ADC_CONV);
ctlreg |= ADC_WAITTRIG | WT_INT_EN;
__raw_writel(ctlreg, w90p910_ts->ts_reg);
w90p910_ts->state = TS_WAIT_NEW_PACKET;
}
static irqreturn_t w90p910_ts_interrupt(int irq, void *dev_id)
{
struct w90p910_ts *w90p910_ts = dev_id;
unsigned long flags;
spin_lock_irqsave(&w90p910_ts->lock, flags);
switch (w90p910_ts->state) {
case TS_WAIT_NEW_PACKET:
/*
* The controller only generates interrupts when pen
* is down.
*/
del_timer(&w90p910_ts->timer);
w90p910_prepare_x_reading(w90p910_ts);
break;
case TS_WAIT_X_COORD:
w90p910_prepare_y_reading(w90p910_ts);
break;
case TS_WAIT_Y_COORD:
w90p910_report_event(w90p910_ts, true);
w90p910_prepare_next_packet(w90p910_ts);
mod_timer(&w90p910_ts->timer, jiffies + msecs_to_jiffies(100));
break;
case TS_IDLE:
break;
}
spin_unlock_irqrestore(&w90p910_ts->lock, flags);
return IRQ_HANDLED;
}
static void w90p910_check_pen_up(unsigned long data)
{
struct w90p910_ts *w90p910_ts = (struct w90p910_ts *) data;
unsigned long flags;
spin_lock_irqsave(&w90p910_ts->lock, flags);
if (w90p910_ts->state == TS_WAIT_NEW_PACKET &&
!(__raw_readl(w90p910_ts->ts_reg + 0x04) & ADC_DOWN)) {
w90p910_report_event(w90p910_ts, false);
}
spin_unlock_irqrestore(&w90p910_ts->lock, flags);
}
static int w90p910_open(struct input_dev *dev)
{
struct w90p910_ts *w90p910_ts = input_get_drvdata(dev);
unsigned long val;
/* enable the ADC clock */
clk_enable(w90p910_ts->clk);
__raw_writel(ADC_RST1, w90p910_ts->ts_reg);
msleep(1);
__raw_writel(ADC_RST0, w90p910_ts->ts_reg);
msleep(1);
/* set delay and screen type */
val = __raw_readl(w90p910_ts->ts_reg + 0x04);
__raw_writel(val & TSC_FOURWIRE, w90p910_ts->ts_reg + 0x04);
__raw_writel(ADC_DELAY, w90p910_ts->ts_reg + 0x08);
w90p910_ts->state = TS_WAIT_NEW_PACKET;
wmb();
/* set trigger mode */
val = __raw_readl(w90p910_ts->ts_reg);
val |= ADC_WAITTRIG | ADC_DIV | ADC_EN | WT_INT_EN;
__raw_writel(val, w90p910_ts->ts_reg);
return 0;
}
static void w90p910_close(struct input_dev *dev)
{
struct w90p910_ts *w90p910_ts = input_get_drvdata(dev);
unsigned long val;
/* disable trigger mode */
spin_lock_irq(&w90p910_ts->lock);
w90p910_ts->state = TS_IDLE;
val = __raw_readl(w90p910_ts->ts_reg);
val &= ~(ADC_WAITTRIG | ADC_DIV | ADC_EN | WT_INT_EN | ADC_INT_EN);
__raw_writel(val, w90p910_ts->ts_reg);
spin_unlock_irq(&w90p910_ts->lock);
/* Now that interrupts are shut off we can safely delete timer */
del_timer_sync(&w90p910_ts->timer);
/* stop the ADC clock */
clk_disable(w90p910_ts->clk);
}
static int __devinit w90x900ts_probe(struct platform_device *pdev)
{
struct w90p910_ts *w90p910_ts;
struct input_dev *input_dev;
struct resource *res;
int err;
w90p910_ts = kzalloc(sizeof(struct w90p910_ts), GFP_KERNEL);
input_dev = input_allocate_device();
if (!w90p910_ts || !input_dev) {
err = -ENOMEM;
goto fail1;
}
w90p910_ts->input = input_dev;
w90p910_ts->state = TS_IDLE;
spin_lock_init(&w90p910_ts->lock);
setup_timer(&w90p910_ts->timer, w90p910_check_pen_up,
(unsigned long)&w90p910_ts);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
err = -ENXIO;
goto fail1;
}
if (!request_mem_region(res->start, resource_size(res),
pdev->name)) {
err = -EBUSY;
goto fail1;
}
w90p910_ts->ts_reg = ioremap(res->start, resource_size(res));
if (!w90p910_ts->ts_reg) {
err = -ENOMEM;
goto fail2;
}
w90p910_ts->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(w90p910_ts->clk)) {
err = PTR_ERR(w90p910_ts->clk);
goto fail3;
}
input_dev->name = "W90P910 TouchScreen";
input_dev->phys = "w90p910ts/event0";
input_dev->id.bustype = BUS_HOST;
input_dev->id.vendor = 0x0005;
input_dev->id.product = 0x0001;
input_dev->id.version = 0x0100;
input_dev->dev.parent = &pdev->dev;
input_dev->open = w90p910_open;
input_dev->close = w90p910_close;
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
input_set_abs_params(input_dev, ABS_X, 0, 0x400, 0, 0);
input_set_abs_params(input_dev, ABS_Y, 0, 0x400, 0, 0);
input_set_drvdata(input_dev, w90p910_ts);
w90p910_ts->irq_num = platform_get_irq(pdev, 0);
if (request_irq(w90p910_ts->irq_num, w90p910_ts_interrupt,
IRQF_DISABLED, "w90p910ts", w90p910_ts)) {
err = -EBUSY;
goto fail4;
}
err = input_register_device(w90p910_ts->input);
if (err)
goto fail5;
platform_set_drvdata(pdev, w90p910_ts);
return 0;
fail5: free_irq(w90p910_ts->irq_num, w90p910_ts);
fail4: clk_put(w90p910_ts->clk);
fail3: iounmap(w90p910_ts->ts_reg);
fail2: release_mem_region(res->start, resource_size(res));
fail1: input_free_device(input_dev);
kfree(w90p910_ts);
return err;
}
static int __devexit w90x900ts_remove(struct platform_device *pdev)
{
struct w90p910_ts *w90p910_ts = platform_get_drvdata(pdev);
struct resource *res;
free_irq(w90p910_ts->irq_num, w90p910_ts);
del_timer_sync(&w90p910_ts->timer);
iounmap(w90p910_ts->ts_reg);
clk_put(w90p910_ts->clk);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(res->start, resource_size(res));
input_unregister_device(w90p910_ts->input);
kfree(w90p910_ts);
platform_set_drvdata(pdev, NULL);
return 0;
}
static struct platform_driver w90x900ts_driver = {
.probe = w90x900ts_probe,
.remove = __devexit_p(w90x900ts_remove),
.driver = {
.name = "nuc900-ts",
.owner = THIS_MODULE,
},
};
static int __init w90x900ts_init(void)
{
return platform_driver_register(&w90x900ts_driver);
}
static void __exit w90x900ts_exit(void)
{
platform_driver_unregister(&w90x900ts_driver);
}
module_init(w90x900ts_init);
module_exit(w90x900ts_exit);
MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
MODULE_DESCRIPTION("w90p910 touch screen driver!");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:nuc900-ts");