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Commit 5437775e authored by Pavel Machek's avatar Pavel Machek Committed by Russell King
Browse files

[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: default avatarPavel Machek <pavel@suse.cz>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 48c92022

drivers/mfd/ucb1x00-ts.c

+17 −48
Original line number Diff line number Diff line 
/*

 *  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;

}
@@ -328,20 +304,14 @@ 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);

}



#ifdef CONFIG_PM

static int ucb1x00_ts_resume(struct ucb1x00_dev *dev)
@@ -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;