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[MFD] Cleanups suggested by Dmitri, Vojtech and lists. 

These are small ucb1x00-ts cleanups, as suggested by Vojtech, Dmitri
and the lists.

Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Pavel Machek 2005-09-11 10:28:00 +01:00 committed by Russell King
parent 48c92022ad
commit 5437775e0b
1 changed files with 17 additions and 48 deletions
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65
drivers/mfd/ucb1x00-ts.c
View File

@ -1,7 +1,8 @@
/*
* linux/drivers/mfd/ucb1x00-ts.c
* Touchscreen driver for UCB1x00-based touchscreens
*
* Copyright (C) 2001 Russell King, All Rights Reserved.
* Copyright (C) 2005 Pavel Machek
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@ -30,6 +31,7 @@
#include <linux/device.h>
#include <linux/suspend.h>
#include <linux/slab.h>
#include <linux/kthread.h>
#include <asm/dma.h>
#include <asm/semaphore.h>
@ -42,10 +44,7 @@ struct ucb1x00_ts {
struct ucb1x00 *ucb;
wait_queue_head_t irq_wait;
struct semaphore sem;
struct completion init_exit;
struct task_struct *rtask;
int use_count;
u16 x_res;
u16 y_res;
@ -176,12 +175,6 @@ static int ucb1x00_thread(void *_ts)
DECLARE_WAITQUEUE(wait, tsk);
int valid;
ts->rtask = tsk;
daemonize("ktsd");
/* only want to receive SIGKILL */
allow_signal(SIGKILL);
/*
* We could run as a real-time thread. However, thus far
* this doesn't seem to be necessary.
@ -189,12 +182,10 @@ static int ucb1x00_thread(void *_ts)
// tsk->policy = SCHED_FIFO;
// tsk->rt_priority = 1;
complete(&ts->init_exit);
valid = 0;
add_wait_queue(&ts->irq_wait, &wait);
for (;;) {
while (!kthread_should_stop()) {
unsigned int x, y, p, val;
signed long timeout;
@ -212,10 +203,7 @@ static int ucb1x00_thread(void *_ts)
ucb1x00_ts_mode_int(ts);
ucb1x00_adc_disable(ts->ucb);
set_task_state(tsk, TASK_UNINTERRUPTIBLE);
schedule_timeout(HZ / 100);
if (signal_pending(tsk))
break;
msleep(10);
ucb1x00_enable(ts->ucb);
val = ucb1x00_reg_read(ts->ucb, UCB_TS_CR);
@ -256,14 +244,12 @@ static int ucb1x00_thread(void *_ts)
try_to_freeze();
schedule_timeout(timeout);
if (signal_pending(tsk))
break;
}
remove_wait_queue(&ts->irq_wait, &wait);
ts->rtask = NULL;
complete_and_exit(&ts->init_exit, 0);
return 0;
}
/*
@ -282,14 +268,7 @@ static int ucb1x00_ts_open(struct input_dev *idev)
struct ucb1x00_ts *ts = (struct ucb1x00_ts *)idev;
int ret = 0;
if (down_interruptible(&ts->sem))
return -EINTR;
if (ts->use_count++ != 0)
goto out;
if (ts->rtask)
panic("ucb1x00: rtask running?");
BUG_ON(ts->rtask);
init_waitqueue_head(&ts->irq_wait);
ret = ucb1x00_hook_irq(ts->ucb, UCB_IRQ_TSPX, ucb1x00_ts_irq, ts);
@ -305,19 +284,16 @@ static int ucb1x00_ts_open(struct input_dev *idev)
ts->y_res = ucb1x00_ts_read_yres(ts);
ucb1x00_adc_disable(ts->ucb);
init_completion(&ts->init_exit);
ret = kernel_thread(ucb1x00_thread, ts, CLONE_KERNEL);
if (ret >= 0) {
wait_for_completion(&ts->init_exit);
ts->rtask = kthread_run(ucb1x00_thread, ts, "ktsd");
if (!IS_ERR(ts->rtask)) {
ret = 0;
} else {
ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts);
ts->rtask = NULL;
ret = -EFAULT;
}
out:
if (ret)
ts->use_count--;
up(&ts->sem);
return ret;
}
@ -328,19 +304,13 @@ static void ucb1x00_ts_close(struct input_dev *idev)
{
struct ucb1x00_ts *ts = (struct ucb1x00_ts *)idev;
down(&ts->sem);
if (--ts->use_count == 0) {
if (ts->rtask) {
send_sig(SIGKILL, ts->rtask, 1);
wait_for_completion(&ts->init_exit);
}
if (ts->rtask)
kthread_stop(ts->rtask);
ucb1x00_enable(ts->ucb);
ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts);
ucb1x00_reg_write(ts->ucb, UCB_TS_CR, 0);
ucb1x00_disable(ts->ucb);
}
up(&ts->sem);
ucb1x00_enable(ts->ucb);
ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts);
ucb1x00_reg_write(ts->ucb, UCB_TS_CR, 0);
ucb1x00_disable(ts->ucb);
}
#ifdef CONFIG_PM
@ -379,7 +349,6 @@ static int ucb1x00_ts_add(struct ucb1x00_dev *dev)
ts->ucb = dev->ucb;
ts->adcsync = adcsync ? UCB_SYNC : UCB_NOSYNC;
init_MUTEX(&ts->sem);
ts->idev.name = "Touchscreen panel";
ts->idev.id.product = ts->ucb->id;