/* * s3c2410-adc.c * * S3C2410 ADC  *  exclusive with s3c2410-ts.c * * Author: SeonKon Choi <bushi@mizi.com> * Date  : $Date: 2003/01/20 14:24:49 $  * * $Revision: 1.1.2.6 $ *   Fri Dec 03 2002 SeonKon Choi <bushi@mizi.com>   - initial * * This file is subject to the terms and conditions of the GNU General Public * License.  See the file COPYING in the main directory of this archive * for more details. */#include <linux/config.h>#include <linux/module.h>#include <linux/kernel.h>#include <linux/init.h>#include <linux/sched.h>#include <linux/irq.h>#include <linux/delay.h>#include <asm/hardware.h>#include <asm/semaphore.h>#undef DEBUG#ifdef DEBUG#define DPRINTK(x...) {printk(__FUNCTION__"(%d): ",__LINE__);printk(##x);}#else#define DPRINTK(x...) (void)(0)#endif#define START_ADC_AIN(x) \	{ \		ADCCON = PRESCALE_EN | PRSCVL(255) | ADC_INPUT((x)) ; \		ADCCON |= ADC_START; \	}static struct semaphore adc_lock;static wait_queue_head_t *adc_wait;static void adcdone_int_handler(int irq, void *dev_id, struct pt_regs *reg){	wake_up(adc_wait);}int s3c2410_adc_read(int ain, wait_queue_head_t *wait){	int ret = 0;	if (down_interruptible(&adc_lock))		return -ERESTARTSYS;	adc_wait = wait;	START_ADC_AIN(ain);	sleep_on_timeout(adc_wait, HZ/100); /* 10ms */#if 0	if (signal_pending(current)) {		up(&adc_lock);		return -ERESTARTSYS;	}#endif	ret = ADCDAT0 ;	up(&adc_lock);	adc_wait = NULL;	DPRINTK("AIN[%d] = 0x%04x, %d\n", ain, ret, ADCCON & 0x80 ? 1:0);	return (ret & 0x3ff);}int __init s3c2410_adc_init(void){	init_MUTEX(&adc_lock);	/* normal ADC */	ADCTSC = 0; //XP_PST(NOP_MODE);	if (request_irq(IRQ_ADC_DONE, adcdone_int_handler, SA_INTERRUPT,			"ADC", NULL) < 0)		goto irq_err;	return 0;irq_err:	return 1;}module_init(s3c2410_adc_init);#ifdef MODULEvoid __exit s3c2410_adc_exit(void){	free_irq(IRQ_ADC_DONE, NULL);}module_exit(s3c2410_adc_exit);MODULE_LICENSE("GPL");#endif